content: /*
   * Copyright (C) 2012 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package android.hardware.camera2;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  import android.annotation.UnsupportedAppUsage;
  import android.hardware.camera2.impl.CameraMetadataNative;
  import android.hardware.camera2.impl.CaptureResultExtras;
  import android.hardware.camera2.impl.PublicKey;
  import android.hardware.camera2.impl.SyntheticKey;
  import android.hardware.camera2.utils.TypeReference;
  import android.util.Log;
  import android.util.Rational;
  
  import java.util.List;
  
  /**
   * <p>The subset of the results of a single image capture from the image sensor.</p>
   *
   * <p>Contains a subset of the final configuration for the capture hardware (sensor, lens,
   * flash), the processing pipeline, the control algorithms, and the output
   * buffers.</p>
   *
   * <p>CaptureResults are produced by a {@link CameraDevice} after processing a
   * {@link CaptureRequest}. All properties listed for capture requests can also
   * be queried on the capture result, to determine the final values used for
   * capture. The result also includes additional metadata about the state of the
   * camera device during the capture.</p>
   *
   * <p>Not all properties returned by {@link CameraCharacteristics#getAvailableCaptureResultKeys()}
   * are necessarily available. Some results are {@link CaptureResult partial} and will
   * not have every key set. Only {@link TotalCaptureResult total} results are guaranteed to have
   * every key available that was enabled by the request.</p>
   *
   * <p>{@link CaptureResult} objects are immutable.</p>
   *
   */
  public class CaptureResult extends CameraMetadata<CaptureResult.Key<?>> {
  
      private static final String TAG = "CaptureResult";
      private static final boolean VERBOSE = false;
  
      /**
       * A {@code Key} is used to do capture result field lookups with
       * {@link CaptureResult#get}.
       *
       * <p>For example, to get the timestamp corresponding to the exposure of the first row:
       * <code><pre>
       * long timestamp = captureResult.get(CaptureResult.SENSOR_TIMESTAMP);
       * </pre></code>
       * </p>
       *
       * <p>To enumerate over all possible keys for {@link CaptureResult}, see
       * {@link CameraCharacteristics#getAvailableCaptureResultKeys}.</p>
       *
       * @see CaptureResult#get
       * @see CameraCharacteristics#getAvailableCaptureResultKeys
       */
      public final static class Key<T> {
          private final CameraMetadataNative.Key<T> mKey;
  
          /**
           * Visible for testing and vendor extensions only.
           *
           * @hide
           */
          @UnsupportedAppUsage
          public Key(String name, Class<T> type, long vendorId) {
              mKey = new CameraMetadataNative.Key<T>(name, type, vendorId);
          }
  
          /**
           * Visible for testing and vendor extensions only.
           *
           * @hide
           */
          public Key(String name, String fallbackName, Class<T> type) {
              mKey = new CameraMetadataNative.Key<T>(name, fallbackName, type);
          }
  
         /**
           * Construct a new Key with a given name and type.
           *
           * <p>Normally, applications should use the existing Key definitions in
           * {@link CaptureResult}, and not need to construct their own Key objects. However, they may
           * be useful for testing purposes and for defining custom capture result fields.</p>
           */
          public Key(@NonNull String name, @NonNull Class<T> type) {
              mKey = new CameraMetadataNative.Key<T>(name, type);
          }
  
          /**
           * Visible for testing and vendor extensions only.
           *
           * @hide
           */
          @UnsupportedAppUsage
          public Key(String name, TypeReference<T> typeReference) {
              mKey = new CameraMetadataNative.Key<T>(name, typeReference);
          }
  
          /**
           * Return a camelCase, period separated name formatted like:
           * {@code "root.section[.subsections].name"}.
           *
           * <p>Built-in keys exposed by the Android SDK are always prefixed with {@code "android."};
           * keys that are device/platform-specific are prefixed with {@code "com."}.</p>
           *
           * <p>For example, {@code CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP} would
           * have a name of {@code "android.scaler.streamConfigurationMap"}; whereas a device
           * specific key might look like {@code "com.google.nexus.data.private"}.</p>
           *
           * @return String representation of the key name
           */
          @NonNull
          public String getName() {
              return mKey.getName();
          }
  
          /**
           * Return vendor tag id.
           *
           * @hide
           */
          public long getVendorId() {
              return mKey.getVendorId();
          }
  
          /**
           * {@inheritDoc}
           */
          @Override
          public final int hashCode() {
              return mKey.hashCode();
          }
  
          /**
           * {@inheritDoc}
           */
          @SuppressWarnings("unchecked")
          @Override
          public final boolean equals(Object o) {
              return o instanceof Key && ((Key<T>)o).mKey.equals(mKey);
          }
  
          /**
           * Return this {@link Key} as a string representation.
           *
           * <p>{@code "CaptureResult.Key(%s)"}, where {@code %s} represents
           * the name of this key as returned by {@link #getName}.</p>
           *
           * @return string representation of {@link Key}
           */
          @NonNull
          @Override
          public String toString() {
              return String.format("CaptureResult.Key(%s)", mKey.getName());
          }
  
          /**
           * Visible for CameraMetadataNative implementation only; do not use.
           *
           * TODO: Make this private or remove it altogether.
           *
           * @hide
           */
          @UnsupportedAppUsage
          public CameraMetadataNative.Key<T> getNativeKey() {
              return mKey;
          }
  
          @SuppressWarnings({ "unchecked" })
          /*package*/ Key(CameraMetadataNative.Key<?> nativeKey) {
              mKey = (CameraMetadataNative.Key<T>) nativeKey;
          }
      }
  
      @UnsupportedAppUsage
      private final CameraMetadataNative mResults;
      private final CaptureRequest mRequest;
      private final int mSequenceId;
      private final long mFrameNumber;
  
      /**
       * Takes ownership of the passed-in properties object
       *
       * <p>For internal use only</p>
       * @hide
       */
      public CaptureResult(CameraMetadataNative results, CaptureRequest parent,
              CaptureResultExtras extras) {
          if (results == null) {
              throw new IllegalArgumentException("results was null");
          }
  
          if (parent == null) {
              throw new IllegalArgumentException("parent was null");
          }
  
          if (extras == null) {
              throw new IllegalArgumentException("extras was null");
          }
  
          mResults = CameraMetadataNative.move(results);
          if (mResults.isEmpty()) {
              throw new AssertionError("Results must not be empty");
          }
          setNativeInstance(mResults);
          mRequest = parent;
          mSequenceId = extras.getRequestId();
          mFrameNumber = extras.getFrameNumber();
      }
  
      /**
       * Returns a copy of the underlying {@link CameraMetadataNative}.
       * @hide
       */
      public CameraMetadataNative getNativeCopy() {
          return new CameraMetadataNative(mResults);
      }
  
      /**
       * Creates a request-less result.
       *
       * <p><strong>For testing only.</strong></p>
       * @hide
       */
      public CaptureResult(CameraMetadataNative results, int sequenceId) {
          if (results == null) {
              throw new IllegalArgumentException("results was null");
          }
  
          mResults = CameraMetadataNative.move(results);
          if (mResults.isEmpty()) {
              throw new AssertionError("Results must not be empty");
          }
  
          setNativeInstance(mResults);
          mRequest = null;
          mSequenceId = sequenceId;
          mFrameNumber = -1;
      }
  
      /**
       * Get a capture result field value.
       *
       * <p>The field definitions can be found in {@link CaptureResult}.</p>
       *
       * <p>Querying the value for the same key more than once will return a value
       * which is equal to the previous queried value.</p>
       *
       * @throws IllegalArgumentException if the key was not valid
       *
       * @param key The result field to read.
       * @return The value of that key, or {@code null} if the field is not set.
       */
      @Nullable
      public <T> T get(Key<T> key) {
          T value = mResults.get(key);
          if (VERBOSE) Log.v(TAG, "#get for Key = " + key.getName() + ", returned value = " + value);
          return value;
      }
  
      /**
       * {@inheritDoc}
       * @hide
       */
      @SuppressWarnings("unchecked")
      @Override
      protected <T> T getProtected(Key<?> key) {
          return (T) mResults.get(key);
      }
  
      /**
       * {@inheritDoc}
       * @hide
       */
      @SuppressWarnings("unchecked")
      @Override
      protected Class<Key<?>> getKeyClass() {
          Object thisClass = Key.class;
          return (Class<Key<?>>)thisClass;
      }
  
      /**
       * Dumps the native metadata contents to logcat.
       *
       * <p>Visibility for testing/debugging only. The results will not
       * include any synthesized keys, as they are invisible to the native layer.</p>
       *
       * @hide
       */
      public void dumpToLog() {
          mResults.dumpToLog();
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      @NonNull
      public List<Key<?>> getKeys() {
          // Force the javadoc for this function to show up on the CaptureResult page
          return super.getKeys();
      }
  
      /**
       * Get the request associated with this result.
       *
       * <p>Whenever a request has been fully or partially captured, with
       * {@link CameraCaptureSession.CaptureCallback#onCaptureCompleted} or
       * {@link CameraCaptureSession.CaptureCallback#onCaptureProgressed}, the {@code result}'s
       * {@code getRequest()} will return that {@code request}.
       * </p>
       *
       * <p>For example,
       * <code><pre>cameraDevice.capture(someRequest, new CaptureCallback() {
       *     {@literal @}Override
       *     void onCaptureCompleted(CaptureRequest myRequest, CaptureResult myResult) {
       *         assert(myResult.getRequest.equals(myRequest) == true);
       *     }
       * }, null);
       * </code></pre>
       * </p>
       *
       * @return The request associated with this result. Never {@code null}.
       */
      @NonNull
      public CaptureRequest getRequest() {
          return mRequest;
      }
  
      /**
       * Get the frame number associated with this result.
       *
       * <p>Whenever a request has been processed, regardless of failure or success,
       * it gets a unique frame number assigned to its future result/failure.</p>
       *
       * <p>For the same type of request (capturing from the camera device or reprocessing), this
       * value monotonically increments, starting with 0, for every new result or failure and the
       * scope is the lifetime of the {@link CameraDevice}. Between different types of requests,
       * the frame number may not monotonically increment. For example, the frame number of a newer
       * reprocess result may be smaller than the frame number of an older result of capturing new
       * images from the camera device, but the frame number of a newer reprocess result will never be
       * smaller than the frame number of an older reprocess result.</p>
       *
       * @return The frame number
       *
       * @see CameraDevice#createCaptureRequest
       * @see CameraDevice#createReprocessCaptureRequest
       */
      public long getFrameNumber() {
          return mFrameNumber;
      }
  
      /**
       * The sequence ID for this failure that was returned by the
       * {@link CameraCaptureSession#capture} family of functions.
       *
       * <p>The sequence ID is a unique monotonically increasing value starting from 0,
       * incremented every time a new group of requests is submitted to the CameraDevice.</p>
       *
       * @return int The ID for the sequence of requests that this capture result is a part of
       *
       * @see CameraCaptureSession.CaptureCallback#onCaptureSequenceCompleted
       * @see CameraCaptureSession.CaptureCallback#onCaptureSequenceAborted
       */
      public int getSequenceId() {
          return mSequenceId;
      }
  
      /*@O~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~
       * The key entries below this point are generated from metadata
       * definitions in /system/media/camera/docs. Do not modify by hand or
       * modify the comment blocks at the start or end.
       *~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~*/
  
      /**
       * <p>The mode control selects how the image data is converted from the
       * sensor's native color into linear sRGB color.</p>
       * <p>When auto-white balance (AWB) is enabled with {@link CaptureRequest#CONTROL_AWB_MODE android.control.awbMode}, this
       * control is overridden by the AWB routine. When AWB is disabled, the
       * application controls how the color mapping is performed.</p>
       * <p>We define the expected processing pipeline below. For consistency
       * across devices, this is always the case with TRANSFORM_MATRIX.</p>
       * <p>When either FULL or HIGH_QUALITY is used, the camera device may
       * do additional processing but {@link CaptureRequest#COLOR_CORRECTION_GAINS android.colorCorrection.gains} and
       * {@link CaptureRequest#COLOR_CORRECTION_TRANSFORM android.colorCorrection.transform} will still be provided by the
       * camera device (in the results) and be roughly correct.</p>
       * <p>Switching to TRANSFORM_MATRIX and using the data provided from
       * FAST or HIGH_QUALITY will yield a picture with the same white point
       * as what was produced by the camera device in the earlier frame.</p>
       * <p>The expected processing pipeline is as follows:</p>
       * <p><img alt="White balance processing pipeline" src="/reference/images/camera2/metadata/android.colorCorrection.mode/processing_pipeline.png" /></p>
       * <p>The white balance is encoded by two values, a 4-channel white-balance
       * gain vector (applied in the Bayer domain), and a 3x3 color transform
       * matrix (applied after demosaic).</p>
       * <p>The 4-channel white-balance gains are defined as:</p>
       * <pre><code>{@link CaptureRequest#COLOR_CORRECTION_GAINS android.colorCorrection.gains} = [ R G_even G_odd B ]
       * </code></pre>
       * <p>where <code>G_even</code> is the gain for green pixels on even rows of the
       * output, and <code>G_odd</code> is the gain for green pixels on the odd rows.
       * These may be identical for a given camera device implementation; if
       * the camera device does not support a separate gain for even/odd green
       * channels, it will use the <code>G_even</code> value, and write <code>G_odd</code> equal to
       * <code>G_even</code> in the output result metadata.</p>
       * <p>The matrices for color transforms are defined as a 9-entry vector:</p>
       * <pre><code>{@link CaptureRequest#COLOR_CORRECTION_TRANSFORM android.colorCorrection.transform} = [ I0 I1 I2 I3 I4 I5 I6 I7 I8 ]
       * </code></pre>
       * <p>which define a transform from input sensor colors, <code>P_in = [ r g b ]</code>,
       * to output linear sRGB, <code>P_out = [ r' g' b' ]</code>,</p>
       * <p>with colors as follows:</p>
       * <pre><code>r' = I0r + I1g + I2b
       * g' = I3r + I4g + I5b
       * b' = I6r + I7g + I8b
       * </code></pre>
       * <p>Both the input and output value ranges must match. Overflow/underflow
       * values are clipped to fit within the range.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #COLOR_CORRECTION_MODE_TRANSFORM_MATRIX TRANSFORM_MATRIX}</li>
       *   <li>{@link #COLOR_CORRECTION_MODE_FAST FAST}</li>
       *   <li>{@link #COLOR_CORRECTION_MODE_HIGH_QUALITY HIGH_QUALITY}</li>
       * </ul></p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#COLOR_CORRECTION_GAINS
       * @see CaptureRequest#COLOR_CORRECTION_TRANSFORM
       * @see CaptureRequest#CONTROL_AWB_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see #COLOR_CORRECTION_MODE_TRANSFORM_MATRIX
       * @see #COLOR_CORRECTION_MODE_FAST
       * @see #COLOR_CORRECTION_MODE_HIGH_QUALITY
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> COLOR_CORRECTION_MODE =
              new Key<Integer>("android.colorCorrection.mode", int.class);
  
      /**
       * <p>A color transform matrix to use to transform
       * from sensor RGB color space to output linear sRGB color space.</p>
       * <p>This matrix is either set by the camera device when the request
       * {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode} is not TRANSFORM_MATRIX, or
       * directly by the application in the request when the
       * {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode} is TRANSFORM_MATRIX.</p>
       * <p>In the latter case, the camera device may round the matrix to account
       * for precision issues; the final rounded matrix should be reported back
       * in this matrix result metadata. The transform should keep the magnitude
       * of the output color values within <code>[0, 1.0]</code> (assuming input color
       * values is within the normalized range <code>[0, 1.0]</code>), or clipping may occur.</p>
       * <p>The valid range of each matrix element varies on different devices, but
       * values within [-1.5, 3.0] are guaranteed not to be clipped.</p>
       * <p><b>Units</b>: Unitless scale factors</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#COLOR_CORRECTION_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       */
      @PublicKey
      @NonNull
      public static final Key<android.hardware.camera2.params.ColorSpaceTransform> COLOR_CORRECTION_TRANSFORM =
              new Key<android.hardware.camera2.params.ColorSpaceTransform>("android.colorCorrection.transform", android.hardware.camera2.params.ColorSpaceTransform.class);
  
      /**
       * <p>Gains applying to Bayer raw color channels for
       * white-balance.</p>
       * <p>These per-channel gains are either set by the camera device
       * when the request {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode} is not
       * TRANSFORM_MATRIX, or directly by the application in the
       * request when the {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode} is
       * TRANSFORM_MATRIX.</p>
       * <p>The gains in the result metadata are the gains actually
       * applied by the camera device to the current frame.</p>
       * <p>The valid range of gains varies on different devices, but gains
       * between [1.0, 3.0] are guaranteed not to be clipped. Even if a given
       * device allows gains below 1.0, this is usually not recommended because
       * this can create color artifacts.</p>
       * <p><b>Units</b>: Unitless gain factors</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#COLOR_CORRECTION_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       */
      @PublicKey
      @NonNull
      public static final Key<android.hardware.camera2.params.RggbChannelVector> COLOR_CORRECTION_GAINS =
              new Key<android.hardware.camera2.params.RggbChannelVector>("android.colorCorrection.gains", android.hardware.camera2.params.RggbChannelVector.class);
  
      /**
       * <p>Mode of operation for the chromatic aberration correction algorithm.</p>
       * <p>Chromatic (color) aberration is caused by the fact that different wavelengths of light
       * can not focus on the same point after exiting from the lens. This metadata defines
       * the high level control of chromatic aberration correction algorithm, which aims to
       * minimize the chromatic artifacts that may occur along the object boundaries in an
       * image.</p>
       * <p>FAST/HIGH_QUALITY both mean that camera device determined aberration
       * correction will be applied. HIGH_QUALITY mode indicates that the camera device will
       * use the highest-quality aberration correction algorithms, even if it slows down
       * capture rate. FAST means the camera device will not slow down capture rate when
       * applying aberration correction.</p>
       * <p>LEGACY devices will always be in FAST mode.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #COLOR_CORRECTION_ABERRATION_MODE_OFF OFF}</li>
       *   <li>{@link #COLOR_CORRECTION_ABERRATION_MODE_FAST FAST}</li>
       *   <li>{@link #COLOR_CORRECTION_ABERRATION_MODE_HIGH_QUALITY HIGH_QUALITY}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#COLOR_CORRECTION_AVAILABLE_ABERRATION_MODES android.colorCorrection.availableAberrationModes}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CameraCharacteristics#COLOR_CORRECTION_AVAILABLE_ABERRATION_MODES
       * @see #COLOR_CORRECTION_ABERRATION_MODE_OFF
       * @see #COLOR_CORRECTION_ABERRATION_MODE_FAST
       * @see #COLOR_CORRECTION_ABERRATION_MODE_HIGH_QUALITY
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> COLOR_CORRECTION_ABERRATION_MODE =
              new Key<Integer>("android.colorCorrection.aberrationMode", int.class);
  
      /**
       * <p>The desired setting for the camera device's auto-exposure
       * algorithm's antibanding compensation.</p>
       * <p>Some kinds of lighting fixtures, such as some fluorescent
       * lights, flicker at the rate of the power supply frequency
       * (60Hz or 50Hz, depending on country). While this is
       * typically not noticeable to a person, it can be visible to
       * a camera device. If a camera sets its exposure time to the
       * wrong value, the flicker may become visible in the
       * viewfinder as flicker or in a final captured image, as a
       * set of variable-brightness bands across the image.</p>
       * <p>Therefore, the auto-exposure routines of camera devices
       * include antibanding routines that ensure that the chosen
       * exposure value will not cause such banding. The choice of
       * exposure time depends on the rate of flicker, which the
       * camera device can detect automatically, or the expected
       * rate can be selected by the application using this
       * control.</p>
       * <p>A given camera device may not support all of the possible
       * options for the antibanding mode. The
       * {@link CameraCharacteristics#CONTROL_AE_AVAILABLE_ANTIBANDING_MODES android.control.aeAvailableAntibandingModes} key contains
       * the available modes for a given camera device.</p>
       * <p>AUTO mode is the default if it is available on given
       * camera device. When AUTO mode is not available, the
       * default will be either 50HZ or 60HZ, and both 50HZ
       * and 60HZ will be available.</p>
       * <p>If manual exposure control is enabled (by setting
       * {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} or {@link CaptureRequest#CONTROL_MODE android.control.mode} to OFF),
       * then this setting has no effect, and the application must
       * ensure it selects exposure times that do not cause banding
       * issues. The {@link CaptureResult#STATISTICS_SCENE_FLICKER android.statistics.sceneFlicker} key can assist
       * the application in this.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_AE_ANTIBANDING_MODE_OFF OFF}</li>
       *   <li>{@link #CONTROL_AE_ANTIBANDING_MODE_50HZ 50HZ}</li>
       *   <li>{@link #CONTROL_AE_ANTIBANDING_MODE_60HZ 60HZ}</li>
       *   <li>{@link #CONTROL_AE_ANTIBANDING_MODE_AUTO AUTO}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br></p>
       * <p>{@link CameraCharacteristics#CONTROL_AE_AVAILABLE_ANTIBANDING_MODES android.control.aeAvailableAntibandingModes}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CameraCharacteristics#CONTROL_AE_AVAILABLE_ANTIBANDING_MODES
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CaptureRequest#CONTROL_MODE
       * @see CaptureResult#STATISTICS_SCENE_FLICKER
       * @see #CONTROL_AE_ANTIBANDING_MODE_OFF
       * @see #CONTROL_AE_ANTIBANDING_MODE_50HZ
       * @see #CONTROL_AE_ANTIBANDING_MODE_60HZ
       * @see #CONTROL_AE_ANTIBANDING_MODE_AUTO
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_AE_ANTIBANDING_MODE =
              new Key<Integer>("android.control.aeAntibandingMode", int.class);
  
      /**
       * <p>Adjustment to auto-exposure (AE) target image
       * brightness.</p>
       * <p>The adjustment is measured as a count of steps, with the
       * step size defined by {@link CameraCharacteristics#CONTROL_AE_COMPENSATION_STEP android.control.aeCompensationStep} and the
       * allowed range by {@link CameraCharacteristics#CONTROL_AE_COMPENSATION_RANGE android.control.aeCompensationRange}.</p>
       * <p>For example, if the exposure value (EV) step is 0.333, '6'
       * will mean an exposure compensation of +2 EV; -3 will mean an
       * exposure compensation of -1 EV. One EV represents a doubling
       * of image brightness. Note that this control will only be
       * effective if {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} <code>!=</code> OFF. This control
       * will take effect even when {@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} <code>== true</code>.</p>
       * <p>In the event of exposure compensation value being changed, camera device
       * may take several frames to reach the newly requested exposure target.
       * During that time, {@link CaptureResult#CONTROL_AE_STATE android.control.aeState} field will be in the SEARCHING
       * state. Once the new exposure target is reached, {@link CaptureResult#CONTROL_AE_STATE android.control.aeState} will
       * change from SEARCHING to either CONVERGED, LOCKED (if AE lock is enabled), or
       * FLASH_REQUIRED (if the scene is too dark for still capture).</p>
       * <p><b>Units</b>: Compensation steps</p>
       * <p><b>Range of valid values:</b><br>
       * {@link CameraCharacteristics#CONTROL_AE_COMPENSATION_RANGE android.control.aeCompensationRange}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CameraCharacteristics#CONTROL_AE_COMPENSATION_RANGE
       * @see CameraCharacteristics#CONTROL_AE_COMPENSATION_STEP
       * @see CaptureRequest#CONTROL_AE_LOCK
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CaptureResult#CONTROL_AE_STATE
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_AE_EXPOSURE_COMPENSATION =
              new Key<Integer>("android.control.aeExposureCompensation", int.class);
  
      /**
       * <p>Whether auto-exposure (AE) is currently locked to its latest
       * calculated values.</p>
       * <p>When set to <code>true</code> (ON), the AE algorithm is locked to its latest parameters,
       * and will not change exposure settings until the lock is set to <code>false</code> (OFF).</p>
       * <p>Note that even when AE is locked, the flash may be fired if
       * the {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} is ON_AUTO_FLASH /
       * ON_ALWAYS_FLASH / ON_AUTO_FLASH_REDEYE.</p>
       * <p>When {@link CaptureRequest#CONTROL_AE_EXPOSURE_COMPENSATION android.control.aeExposureCompensation} is changed, even if the AE lock
       * is ON, the camera device will still adjust its exposure value.</p>
       * <p>If AE precapture is triggered (see {@link CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER android.control.aePrecaptureTrigger})
       * when AE is already locked, the camera device will not change the exposure time
       * ({@link CaptureRequest#SENSOR_EXPOSURE_TIME android.sensor.exposureTime}) and sensitivity ({@link CaptureRequest#SENSOR_SENSITIVITY android.sensor.sensitivity})
       * parameters. The flash may be fired if the {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode}
       * is ON_AUTO_FLASH/ON_AUTO_FLASH_REDEYE and the scene is too dark. If the
       * {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} is ON_ALWAYS_FLASH, the scene may become overexposed.
       * Similarly, AE precapture trigger CANCEL has no effect when AE is already locked.</p>
       * <p>When an AE precapture sequence is triggered, AE unlock will not be able to unlock
       * the AE if AE is locked by the camera device internally during precapture metering
       * sequence In other words, submitting requests with AE unlock has no effect for an
       * ongoing precapture metering sequence. Otherwise, the precapture metering sequence
       * will never succeed in a sequence of preview requests where AE lock is always set
       * to <code>false</code>.</p>
       * <p>Since the camera device has a pipeline of in-flight requests, the settings that
       * get locked do not necessarily correspond to the settings that were present in the
       * latest capture result received from the camera device, since additional captures
       * and AE updates may have occurred even before the result was sent out. If an
       * application is switching between automatic and manual control and wishes to eliminate
       * any flicker during the switch, the following procedure is recommended:</p>
       * <ol>
       * <li>Starting in auto-AE mode:</li>
       * <li>Lock AE</li>
       * <li>Wait for the first result to be output that has the AE locked</li>
       * <li>Copy exposure settings from that result into a request, set the request to manual AE</li>
       * <li>Submit the capture request, proceed to run manual AE as desired.</li>
       * </ol>
       * <p>See {@link CaptureResult#CONTROL_AE_STATE android.control.aeState} for AE lock related state transition details.</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#CONTROL_AE_EXPOSURE_COMPENSATION
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER
       * @see CaptureResult#CONTROL_AE_STATE
       * @see CaptureRequest#SENSOR_EXPOSURE_TIME
       * @see CaptureRequest#SENSOR_SENSITIVITY
       */
      @PublicKey
      @NonNull
      public static final Key<Boolean> CONTROL_AE_LOCK =
              new Key<Boolean>("android.control.aeLock", boolean.class);
  
      /**
       * <p>The desired mode for the camera device's
       * auto-exposure routine.</p>
       * <p>This control is only effective if {@link CaptureRequest#CONTROL_MODE android.control.mode} is
       * AUTO.</p>
       * <p>When set to any of the ON modes, the camera device's
       * auto-exposure routine is enabled, overriding the
       * application's selected exposure time, sensor sensitivity,
       * and frame duration ({@link CaptureRequest#SENSOR_EXPOSURE_TIME android.sensor.exposureTime},
       * {@link CaptureRequest#SENSOR_SENSITIVITY android.sensor.sensitivity}, and
       * {@link CaptureRequest#SENSOR_FRAME_DURATION android.sensor.frameDuration}). If one of the FLASH modes
       * is selected, the camera device's flash unit controls are
       * also overridden.</p>
       * <p>The FLASH modes are only available if the camera device
       * has a flash unit ({@link CameraCharacteristics#FLASH_INFO_AVAILABLE android.flash.info.available} is <code>true</code>).</p>
       * <p>If flash TORCH mode is desired, this field must be set to
       * ON or OFF, and {@link CaptureRequest#FLASH_MODE android.flash.mode} set to TORCH.</p>
       * <p>When set to any of the ON modes, the values chosen by the
       * camera device auto-exposure routine for the overridden
       * fields for a given capture will be available in its
       * CaptureResult.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_AE_MODE_OFF OFF}</li>
       *   <li>{@link #CONTROL_AE_MODE_ON ON}</li>
       *   <li>{@link #CONTROL_AE_MODE_ON_AUTO_FLASH ON_AUTO_FLASH}</li>
       *   <li>{@link #CONTROL_AE_MODE_ON_ALWAYS_FLASH ON_ALWAYS_FLASH}</li>
       *   <li>{@link #CONTROL_AE_MODE_ON_AUTO_FLASH_REDEYE ON_AUTO_FLASH_REDEYE}</li>
       *   <li>{@link #CONTROL_AE_MODE_ON_EXTERNAL_FLASH ON_EXTERNAL_FLASH}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#CONTROL_AE_AVAILABLE_MODES android.control.aeAvailableModes}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CameraCharacteristics#CONTROL_AE_AVAILABLE_MODES
       * @see CaptureRequest#CONTROL_MODE
       * @see CameraCharacteristics#FLASH_INFO_AVAILABLE
       * @see CaptureRequest#FLASH_MODE
       * @see CaptureRequest#SENSOR_EXPOSURE_TIME
       * @see CaptureRequest#SENSOR_FRAME_DURATION
       * @see CaptureRequest#SENSOR_SENSITIVITY
       * @see #CONTROL_AE_MODE_OFF
       * @see #CONTROL_AE_MODE_ON
       * @see #CONTROL_AE_MODE_ON_AUTO_FLASH
       * @see #CONTROL_AE_MODE_ON_ALWAYS_FLASH
       * @see #CONTROL_AE_MODE_ON_AUTO_FLASH_REDEYE
       * @see #CONTROL_AE_MODE_ON_EXTERNAL_FLASH
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_AE_MODE =
              new Key<Integer>("android.control.aeMode", int.class);
  
      /**
       * <p>List of metering areas to use for auto-exposure adjustment.</p>
       * <p>Not available if {@link CameraCharacteristics#CONTROL_MAX_REGIONS_AE android.control.maxRegionsAe} is 0.
       * Otherwise will always be present.</p>
       * <p>The maximum number of regions supported by the device is determined by the value
       * of {@link CameraCharacteristics#CONTROL_MAX_REGIONS_AE android.control.maxRegionsAe}.</p>
       * <p>For devices not supporting {@link CaptureRequest#DISTORTION_CORRECTION_MODE android.distortionCorrection.mode} control, the coordinate
       * system always follows that of {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, with (0,0) being
       * the top-left pixel in the active pixel array, and
       * ({@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.width - 1,
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.height - 1) being the bottom-right pixel in the
       * active pixel array.</p>
       * <p>For devices supporting {@link CaptureRequest#DISTORTION_CORRECTION_MODE android.distortionCorrection.mode} control, the coordinate
       * system depends on the mode being set.
       * When the distortion correction mode is OFF, the coordinate system follows
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}, with
       * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array, and
       * ({@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}.width - 1,
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}.height - 1) being the bottom-right
       * pixel in the pre-correction active pixel array.
       * When the distortion correction mode is not OFF, the coordinate system follows
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, with
       * <code>(0, 0)</code> being the top-left pixel of the active array, and
       * ({@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.width - 1,
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.height - 1) being the bottom-right pixel in the
       * active pixel array.</p>
       * <p>The weight must be within <code>[0, 1000]</code>, and represents a weight
       * for every pixel in the area. This means that a large metering area
       * with the same weight as a smaller area will have more effect in
       * the metering result. Metering areas can partially overlap and the
       * camera device will add the weights in the overlap region.</p>
       * <p>The weights are relative to weights of other exposure metering regions, so if only one
       * region is used, all non-zero weights will have the same effect. A region with 0
       * weight is ignored.</p>
       * <p>If all regions have 0 weight, then no specific metering area needs to be used by the
       * camera device.</p>
       * <p>If the metering region is outside the used {@link CaptureRequest#SCALER_CROP_REGION android.scaler.cropRegion} returned in
       * capture result metadata, the camera device will ignore the sections outside the crop
       * region and output only the intersection rectangle as the metering region in the result
       * metadata.  If the region is entirely outside the crop region, it will be ignored and
       * not reported in the result metadata.</p>
       * <p><b>Units</b>: Pixel coordinates within {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize} or
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize} depending on
       * distortion correction capability and mode</p>
       * <p><b>Range of valid values:</b><br>
       * Coordinates must be between <code>[(0,0), (width, height))</code> of
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize} or {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}
       * depending on distortion correction capability and mode</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CameraCharacteristics#CONTROL_MAX_REGIONS_AE
       * @see CaptureRequest#DISTORTION_CORRECTION_MODE
       * @see CaptureRequest#SCALER_CROP_REGION
       * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
       * @see CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
       */
      @PublicKey
      @NonNull
      public static final Key<android.hardware.camera2.params.MeteringRectangle[]> CONTROL_AE_REGIONS =
              new Key<android.hardware.camera2.params.MeteringRectangle[]>("android.control.aeRegions", android.hardware.camera2.params.MeteringRectangle[].class);
  
      /**
       * <p>Range over which the auto-exposure routine can
       * adjust the capture frame rate to maintain good
       * exposure.</p>
       * <p>Only constrains auto-exposure (AE) algorithm, not
       * manual control of {@link CaptureRequest#SENSOR_EXPOSURE_TIME android.sensor.exposureTime} and
       * {@link CaptureRequest#SENSOR_FRAME_DURATION android.sensor.frameDuration}.</p>
       * <p><b>Units</b>: Frames per second (FPS)</p>
       * <p><b>Range of valid values:</b><br>
       * Any of the entries in {@link CameraCharacteristics#CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES android.control.aeAvailableTargetFpsRanges}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CameraCharacteristics#CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES
       * @see CaptureRequest#SENSOR_EXPOSURE_TIME
       * @see CaptureRequest#SENSOR_FRAME_DURATION
       */
      @PublicKey
      @NonNull
      public static final Key<android.util.Range<Integer>> CONTROL_AE_TARGET_FPS_RANGE =
              new Key<android.util.Range<Integer>>("android.control.aeTargetFpsRange", new TypeReference<android.util.Range<Integer>>() {{ }});
  
      /**
       * <p>Whether the camera device will trigger a precapture
       * metering sequence when it processes this request.</p>
       * <p>This entry is normally set to IDLE, or is not
       * included at all in the request settings. When included and
       * set to START, the camera device will trigger the auto-exposure (AE)
       * precapture metering sequence.</p>
       * <p>When set to CANCEL, the camera device will cancel any active
       * precapture metering trigger, and return to its initial AE state.
       * If a precapture metering sequence is already completed, and the camera
       * device has implicitly locked the AE for subsequent still capture, the
       * CANCEL trigger will unlock the AE and return to its initial AE state.</p>
       * <p>The precapture sequence should be triggered before starting a
       * high-quality still capture for final metering decisions to
       * be made, and for firing pre-capture flash pulses to estimate
       * scene brightness and required final capture flash power, when
       * the flash is enabled.</p>
       * <p>Normally, this entry should be set to START for only a
       * single request, and the application should wait until the
       * sequence completes before starting a new one.</p>
       * <p>When a precapture metering sequence is finished, the camera device
       * may lock the auto-exposure routine internally to be able to accurately expose the
       * subsequent still capture image (<code>{@link CaptureRequest#CONTROL_CAPTURE_INTENT android.control.captureIntent} == STILL_CAPTURE</code>).
       * For this case, the AE may not resume normal scan if no subsequent still capture is
       * submitted. To ensure that the AE routine restarts normal scan, the application should
       * submit a request with <code>{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} == true</code>, followed by a request
       * with <code>{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} == false</code>, if the application decides not to submit a
       * still capture request after the precapture sequence completes. Alternatively, for
       * API level 23 or newer devices, the CANCEL can be used to unlock the camera device
       * internally locked AE if the application doesn't submit a still capture request after
       * the AE precapture trigger. Note that, the CANCEL was added in API level 23, and must not
       * be used in devices that have earlier API levels.</p>
       * <p>The exact effect of auto-exposure (AE) precapture trigger
       * depends on the current AE mode and state; see
       * {@link CaptureResult#CONTROL_AE_STATE android.control.aeState} for AE precapture state transition
       * details.</p>
       * <p>On LEGACY-level devices, the precapture trigger is not supported;
       * capturing a high-resolution JPEG image will automatically trigger a
       * precapture sequence before the high-resolution capture, including
       * potentially firing a pre-capture flash.</p>
       * <p>Using the precapture trigger and the auto-focus trigger {@link CaptureRequest#CONTROL_AF_TRIGGER android.control.afTrigger}
       * simultaneously is allowed. However, since these triggers often require cooperation between
       * the auto-focus and auto-exposure routines (for example, the may need to be enabled for a
       * focus sweep), the camera device may delay acting on a later trigger until the previous
       * trigger has been fully handled. This may lead to longer intervals between the trigger and
       * changes to {@link CaptureResult#CONTROL_AE_STATE android.control.aeState} indicating the start of the precapture sequence, for
       * example.</p>
       * <p>If both the precapture and the auto-focus trigger are activated on the same request, then
       * the camera device will complete them in the optimal order for that device.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_AE_PRECAPTURE_TRIGGER_IDLE IDLE}</li>
       *   <li>{@link #CONTROL_AE_PRECAPTURE_TRIGGER_START START}</li>
       *   <li>{@link #CONTROL_AE_PRECAPTURE_TRIGGER_CANCEL CANCEL}</li>
       * </ul></p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Limited capability</b> -
       * Present on all camera devices that report being at least {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED HARDWARE_LEVEL_LIMITED} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#CONTROL_AE_LOCK
       * @see CaptureResult#CONTROL_AE_STATE
       * @see CaptureRequest#CONTROL_AF_TRIGGER
       * @see CaptureRequest#CONTROL_CAPTURE_INTENT
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see #CONTROL_AE_PRECAPTURE_TRIGGER_IDLE
       * @see #CONTROL_AE_PRECAPTURE_TRIGGER_START
       * @see #CONTROL_AE_PRECAPTURE_TRIGGER_CANCEL
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_AE_PRECAPTURE_TRIGGER =
              new Key<Integer>("android.control.aePrecaptureTrigger", int.class);
  
      /**
       * <p>Current state of the auto-exposure (AE) algorithm.</p>
       * <p>Switching between or enabling AE modes ({@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode}) always
       * resets the AE state to INACTIVE. Similarly, switching between {@link CaptureRequest#CONTROL_MODE android.control.mode},
       * or {@link CaptureRequest#CONTROL_SCENE_MODE android.control.sceneMode} if <code>{@link CaptureRequest#CONTROL_MODE android.control.mode} == USE_SCENE_MODE</code> resets all
       * the algorithm states to INACTIVE.</p>
       * <p>The camera device can do several state transitions between two results, if it is
       * allowed by the state transition table. For example: INACTIVE may never actually be
       * seen in a result.</p>
       * <p>The state in the result is the state for this image (in sync with this image): if
       * AE state becomes CONVERGED, then the image data associated with this result should
       * be good to use.</p>
       * <p>Below are state transition tables for different AE modes.</p>
       * <table>
       * <thead>
       * <tr>
       * <th align="center">State</th>
       * <th align="center">Transition Cause</th>
       * <th align="center">New State</th>
       * <th align="center">Notes</th>
       * </tr>
       * </thead>
       * <tbody>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center"></td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Camera device auto exposure algorithm is disabled</td>
       * </tr>
       * </tbody>
       * </table>
       * <p>When {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} is AE_MODE_ON*:</p>
       * <table>
       * <thead>
       * <tr>
       * <th align="center">State</th>
       * <th align="center">Transition Cause</th>
       * <th align="center">New State</th>
       * <th align="center">Notes</th>
       * </tr>
       * </thead>
       * <tbody>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">Camera device initiates AE scan</td>
       * <td align="center">SEARCHING</td>
       * <td align="center">Values changing</td>
       * </tr>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is ON</td>
       * <td align="center">LOCKED</td>
       * <td align="center">Values locked</td>
       * </tr>
       * <tr>
       * <td align="center">SEARCHING</td>
       * <td align="center">Camera device finishes AE scan</td>
       * <td align="center">CONVERGED</td>
       * <td align="center">Good values, not changing</td>
       * </tr>
       * <tr>
       * <td align="center">SEARCHING</td>
       * <td align="center">Camera device finishes AE scan</td>
       * <td align="center">FLASH_REQUIRED</td>
       * <td align="center">Converged but too dark w/o flash</td>
       * </tr>
       * <tr>
       * <td align="center">SEARCHING</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is ON</td>
       * <td align="center">LOCKED</td>
       * <td align="center">Values locked</td>
       * </tr>
       * <tr>
       * <td align="center">CONVERGED</td>
       * <td align="center">Camera device initiates AE scan</td>
       * <td align="center">SEARCHING</td>
       * <td align="center">Values changing</td>
       * </tr>
       * <tr>
       * <td align="center">CONVERGED</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is ON</td>
       * <td align="center">LOCKED</td>
       * <td align="center">Values locked</td>
       * </tr>
       * <tr>
       * <td align="center">FLASH_REQUIRED</td>
       * <td align="center">Camera device initiates AE scan</td>
       * <td align="center">SEARCHING</td>
       * <td align="center">Values changing</td>
       * </tr>
       * <tr>
       * <td align="center">FLASH_REQUIRED</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is ON</td>
       * <td align="center">LOCKED</td>
       * <td align="center">Values locked</td>
       * </tr>
       * <tr>
       * <td align="center">LOCKED</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is OFF</td>
       * <td align="center">SEARCHING</td>
       * <td align="center">Values not good after unlock</td>
       * </tr>
       * <tr>
       * <td align="center">LOCKED</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is OFF</td>
       * <td align="center">CONVERGED</td>
       * <td align="center">Values good after unlock</td>
       * </tr>
       * <tr>
       * <td align="center">LOCKED</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is OFF</td>
       * <td align="center">FLASH_REQUIRED</td>
       * <td align="center">Exposure good, but too dark</td>
       * </tr>
       * <tr>
       * <td align="center">PRECAPTURE</td>
       * <td align="center">Sequence done. {@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is OFF</td>
       * <td align="center">CONVERGED</td>
       * <td align="center">Ready for high-quality capture</td>
       * </tr>
       * <tr>
       * <td align="center">PRECAPTURE</td>
       * <td align="center">Sequence done. {@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is ON</td>
       * <td align="center">LOCKED</td>
       * <td align="center">Ready for high-quality capture</td>
       * </tr>
       * <tr>
       * <td align="center">LOCKED</td>
       * <td align="center">aeLock is ON and aePrecaptureTrigger is START</td>
       * <td align="center">LOCKED</td>
       * <td align="center">Precapture trigger is ignored when AE is already locked</td>
       * </tr>
       * <tr>
       * <td align="center">LOCKED</td>
       * <td align="center">aeLock is ON and aePrecaptureTrigger is CANCEL</td>
       * <td align="center">LOCKED</td>
       * <td align="center">Precapture trigger is ignored when AE is already locked</td>
       * </tr>
       * <tr>
       * <td align="center">Any state (excluding LOCKED)</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER android.control.aePrecaptureTrigger} is START</td>
       * <td align="center">PRECAPTURE</td>
       * <td align="center">Start AE precapture metering sequence</td>
       * </tr>
       * <tr>
       * <td align="center">Any state (excluding LOCKED)</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER android.control.aePrecaptureTrigger} is CANCEL</td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Currently active precapture metering sequence is canceled</td>
       * </tr>
       * </tbody>
       * </table>
       * <p>If the camera device supports AE external flash mode (ON_EXTERNAL_FLASH is included in
       * {@link CameraCharacteristics#CONTROL_AE_AVAILABLE_MODES android.control.aeAvailableModes}), {@link CaptureResult#CONTROL_AE_STATE android.control.aeState} must be FLASH_REQUIRED after
       * the camera device finishes AE scan and it's too dark without flash.</p>
       * <p>For the above table, the camera device may skip reporting any state changes that happen
       * without application intervention (i.e. mode switch, trigger, locking). Any state that
       * can be skipped in that manner is called a transient state.</p>
       * <p>For example, for above AE modes (AE_MODE_ON*), in addition to the state transitions
       * listed in above table, it is also legal for the camera device to skip one or more
       * transient states between two results. See below table for examples:</p>
       * <table>
       * <thead>
       * <tr>
       * <th align="center">State</th>
       * <th align="center">Transition Cause</th>
       * <th align="center">New State</th>
       * <th align="center">Notes</th>
       * </tr>
       * </thead>
       * <tbody>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">Camera device finished AE scan</td>
       * <td align="center">CONVERGED</td>
       * <td align="center">Values are already good, transient states are skipped by camera device.</td>
       * </tr>
       * <tr>
       * <td align="center">Any state (excluding LOCKED)</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER android.control.aePrecaptureTrigger} is START, sequence done</td>
       * <td align="center">FLASH_REQUIRED</td>
       * <td align="center">Converged but too dark w/o flash after a precapture sequence, transient states are skipped by camera device.</td>
       * </tr>
       * <tr>
       * <td align="center">Any state (excluding LOCKED)</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER android.control.aePrecaptureTrigger} is START, sequence done</td>
       * <td align="center">CONVERGED</td>
       * <td align="center">Converged after a precapture sequence, transient states are skipped by camera device.</td>
       * </tr>
       * <tr>
       * <td align="center">Any state (excluding LOCKED)</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER android.control.aePrecaptureTrigger} is CANCEL, converged</td>
       * <td align="center">FLASH_REQUIRED</td>
       * <td align="center">Converged but too dark w/o flash after a precapture sequence is canceled, transient states are skipped by camera device.</td>
       * </tr>
       * <tr>
       * <td align="center">Any state (excluding LOCKED)</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER android.control.aePrecaptureTrigger} is CANCEL, converged</td>
       * <td align="center">CONVERGED</td>
       * <td align="center">Converged after a precapture sequenceis canceled, transient states are skipped by camera device.</td>
       * </tr>
       * <tr>
       * <td align="center">CONVERGED</td>
       * <td align="center">Camera device finished AE scan</td>
       * <td align="center">FLASH_REQUIRED</td>
       * <td align="center">Converged but too dark w/o flash after a new scan, transient states are skipped by camera device.</td>
       * </tr>
       * <tr>
       * <td align="center">FLASH_REQUIRED</td>
       * <td align="center">Camera device finished AE scan</td>
       * <td align="center">CONVERGED</td>
       * <td align="center">Converged after a new scan, transient states are skipped by camera device.</td>
       * </tr>
       * </tbody>
       * </table>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_AE_STATE_INACTIVE INACTIVE}</li>
       *   <li>{@link #CONTROL_AE_STATE_SEARCHING SEARCHING}</li>
       *   <li>{@link #CONTROL_AE_STATE_CONVERGED CONVERGED}</li>
       *   <li>{@link #CONTROL_AE_STATE_LOCKED LOCKED}</li>
       *   <li>{@link #CONTROL_AE_STATE_FLASH_REQUIRED FLASH_REQUIRED}</li>
       *   <li>{@link #CONTROL_AE_STATE_PRECAPTURE PRECAPTURE}</li>
       * </ul></p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Limited capability</b> -
       * Present on all camera devices that report being at least {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED HARDWARE_LEVEL_LIMITED} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#CONTROL_AE_AVAILABLE_MODES
       * @see CaptureRequest#CONTROL_AE_LOCK
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER
       * @see CaptureResult#CONTROL_AE_STATE
       * @see CaptureRequest#CONTROL_MODE
       * @see CaptureRequest#CONTROL_SCENE_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see #CONTROL_AE_STATE_INACTIVE
       * @see #CONTROL_AE_STATE_SEARCHING
       * @see #CONTROL_AE_STATE_CONVERGED
       * @see #CONTROL_AE_STATE_LOCKED
       * @see #CONTROL_AE_STATE_FLASH_REQUIRED
       * @see #CONTROL_AE_STATE_PRECAPTURE
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_AE_STATE =
              new Key<Integer>("android.control.aeState", int.class);
  
      /**
       * <p>Whether auto-focus (AF) is currently enabled, and what
       * mode it is set to.</p>
       * <p>Only effective if {@link CaptureRequest#CONTROL_MODE android.control.mode} = AUTO and the lens is not fixed focus
       * (i.e. <code>{@link CameraCharacteristics#LENS_INFO_MINIMUM_FOCUS_DISTANCE android.lens.info.minimumFocusDistance} &gt; 0</code>). Also note that
       * when {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} is OFF, the behavior of AF is device
       * dependent. It is recommended to lock AF by using {@link CaptureRequest#CONTROL_AF_TRIGGER android.control.afTrigger} before
       * setting {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} to OFF, or set AF mode to OFF when AE is OFF.</p>
       * <p>If the lens is controlled by the camera device auto-focus algorithm,
       * the camera device will report the current AF status in {@link CaptureResult#CONTROL_AF_STATE android.control.afState}
       * in result metadata.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_AF_MODE_OFF OFF}</li>
       *   <li>{@link #CONTROL_AF_MODE_AUTO AUTO}</li>
       *   <li>{@link #CONTROL_AF_MODE_MACRO MACRO}</li>
       *   <li>{@link #CONTROL_AF_MODE_CONTINUOUS_VIDEO CONTINUOUS_VIDEO}</li>
       *   <li>{@link #CONTROL_AF_MODE_CONTINUOUS_PICTURE CONTINUOUS_PICTURE}</li>
       *   <li>{@link #CONTROL_AF_MODE_EDOF EDOF}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#CONTROL_AF_AVAILABLE_MODES android.control.afAvailableModes}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CameraCharacteristics#CONTROL_AF_AVAILABLE_MODES
       * @see CaptureResult#CONTROL_AF_STATE
       * @see CaptureRequest#CONTROL_AF_TRIGGER
       * @see CaptureRequest#CONTROL_MODE
       * @see CameraCharacteristics#LENS_INFO_MINIMUM_FOCUS_DISTANCE
       * @see #CONTROL_AF_MODE_OFF
       * @see #CONTROL_AF_MODE_AUTO
       * @see #CONTROL_AF_MODE_MACRO
       * @see #CONTROL_AF_MODE_CONTINUOUS_VIDEO
       * @see #CONTROL_AF_MODE_CONTINUOUS_PICTURE
       * @see #CONTROL_AF_MODE_EDOF
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_AF_MODE =
              new Key<Integer>("android.control.afMode", int.class);
  
      /**
       * <p>List of metering areas to use for auto-focus.</p>
       * <p>Not available if {@link CameraCharacteristics#CONTROL_MAX_REGIONS_AF android.control.maxRegionsAf} is 0.
       * Otherwise will always be present.</p>
       * <p>The maximum number of focus areas supported by the device is determined by the value
       * of {@link CameraCharacteristics#CONTROL_MAX_REGIONS_AF android.control.maxRegionsAf}.</p>
       * <p>For devices not supporting {@link CaptureRequest#DISTORTION_CORRECTION_MODE android.distortionCorrection.mode} control, the coordinate
       * system always follows that of {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, with (0,0) being
       * the top-left pixel in the active pixel array, and
       * ({@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.width - 1,
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.height - 1) being the bottom-right pixel in the
       * active pixel array.</p>
       * <p>For devices supporting {@link CaptureRequest#DISTORTION_CORRECTION_MODE android.distortionCorrection.mode} control, the coordinate
       * system depends on the mode being set.
       * When the distortion correction mode is OFF, the coordinate system follows
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}, with
       * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array, and
       * ({@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}.width - 1,
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}.height - 1) being the bottom-right
       * pixel in the pre-correction active pixel array.
       * When the distortion correction mode is not OFF, the coordinate system follows
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, with
       * <code>(0, 0)</code> being the top-left pixel of the active array, and
       * ({@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.width - 1,
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.height - 1) being the bottom-right pixel in the
       * active pixel array.</p>
       * <p>The weight must be within <code>[0, 1000]</code>, and represents a weight
       * for every pixel in the area. This means that a large metering area
       * with the same weight as a smaller area will have more effect in
       * the metering result. Metering areas can partially overlap and the
       * camera device will add the weights in the overlap region.</p>
       * <p>The weights are relative to weights of other metering regions, so if only one region
       * is used, all non-zero weights will have the same effect. A region with 0 weight is
       * ignored.</p>
       * <p>If all regions have 0 weight, then no specific metering area needs to be used by the
       * camera device. The capture result will either be a zero weight region as well, or
       * the region selected by the camera device as the focus area of interest.</p>
       * <p>If the metering region is outside the used {@link CaptureRequest#SCALER_CROP_REGION android.scaler.cropRegion} returned in
       * capture result metadata, the camera device will ignore the sections outside the crop
       * region and output only the intersection rectangle as the metering region in the result
       * metadata. If the region is entirely outside the crop region, it will be ignored and
       * not reported in the result metadata.</p>
       * <p><b>Units</b>: Pixel coordinates within {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize} or
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize} depending on
       * distortion correction capability and mode</p>
       * <p><b>Range of valid values:</b><br>
       * Coordinates must be between <code>[(0,0), (width, height))</code> of
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize} or {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}
       * depending on distortion correction capability and mode</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CameraCharacteristics#CONTROL_MAX_REGIONS_AF
       * @see CaptureRequest#DISTORTION_CORRECTION_MODE
       * @see CaptureRequest#SCALER_CROP_REGION
       * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
       * @see CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
       */
      @PublicKey
      @NonNull
      public static final Key<android.hardware.camera2.params.MeteringRectangle[]> CONTROL_AF_REGIONS =
              new Key<android.hardware.camera2.params.MeteringRectangle[]>("android.control.afRegions", android.hardware.camera2.params.MeteringRectangle[].class);
  
      /**
       * <p>Whether the camera device will trigger autofocus for this request.</p>
       * <p>This entry is normally set to IDLE, or is not
       * included at all in the request settings.</p>
       * <p>When included and set to START, the camera device will trigger the
       * autofocus algorithm. If autofocus is disabled, this trigger has no effect.</p>
       * <p>When set to CANCEL, the camera device will cancel any active trigger,
       * and return to its initial AF state.</p>
       * <p>Generally, applications should set this entry to START or CANCEL for only a
       * single capture, and then return it to IDLE (or not set at all). Specifying
       * START for multiple captures in a row means restarting the AF operation over
       * and over again.</p>
       * <p>See {@link CaptureResult#CONTROL_AF_STATE android.control.afState} for what the trigger means for each AF mode.</p>
       * <p>Using the autofocus trigger and the precapture trigger {@link CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER android.control.aePrecaptureTrigger}
       * simultaneously is allowed. However, since these triggers often require cooperation between
       * the auto-focus and auto-exposure routines (for example, the may need to be enabled for a
       * focus sweep), the camera device may delay acting on a later trigger until the previous
       * trigger has been fully handled. This may lead to longer intervals between the trigger and
       * changes to {@link CaptureResult#CONTROL_AF_STATE android.control.afState}, for example.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_AF_TRIGGER_IDLE IDLE}</li>
       *   <li>{@link #CONTROL_AF_TRIGGER_START START}</li>
       *   <li>{@link #CONTROL_AF_TRIGGER_CANCEL CANCEL}</li>
       * </ul></p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER
       * @see CaptureResult#CONTROL_AF_STATE
       * @see #CONTROL_AF_TRIGGER_IDLE
       * @see #CONTROL_AF_TRIGGER_START
       * @see #CONTROL_AF_TRIGGER_CANCEL
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_AF_TRIGGER =
              new Key<Integer>("android.control.afTrigger", int.class);
  
      /**
       * <p>Current state of auto-focus (AF) algorithm.</p>
       * <p>Switching between or enabling AF modes ({@link CaptureRequest#CONTROL_AF_MODE android.control.afMode}) always
       * resets the AF state to INACTIVE. Similarly, switching between {@link CaptureRequest#CONTROL_MODE android.control.mode},
       * or {@link CaptureRequest#CONTROL_SCENE_MODE android.control.sceneMode} if <code>{@link CaptureRequest#CONTROL_MODE android.control.mode} == USE_SCENE_MODE</code> resets all
       * the algorithm states to INACTIVE.</p>
       * <p>The camera device can do several state transitions between two results, if it is
       * allowed by the state transition table. For example: INACTIVE may never actually be
       * seen in a result.</p>
       * <p>The state in the result is the state for this image (in sync with this image): if
       * AF state becomes FOCUSED, then the image data associated with this result should
       * be sharp.</p>
       * <p>Below are state transition tables for different AF modes.</p>
       * <p>When {@link CaptureRequest#CONTROL_AF_MODE android.control.afMode} is AF_MODE_OFF or AF_MODE_EDOF:</p>
       * <table>
       * <thead>
       * <tr>
       * <th align="center">State</th>
       * <th align="center">Transition Cause</th>
       * <th align="center">New State</th>
       * <th align="center">Notes</th>
       * </tr>
       * </thead>
       * <tbody>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center"></td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Never changes</td>
       * </tr>
       * </tbody>
       * </table>
       * <p>When {@link CaptureRequest#CONTROL_AF_MODE android.control.afMode} is AF_MODE_AUTO or AF_MODE_MACRO:</p>
       * <table>
       * <thead>
       * <tr>
       * <th align="center">State</th>
       * <th align="center">Transition Cause</th>
       * <th align="center">New State</th>
       * <th align="center">Notes</th>
       * </tr>
       * </thead>
       * <tbody>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">ACTIVE_SCAN</td>
       * <td align="center">Start AF sweep, Lens now moving</td>
       * </tr>
       * <tr>
       * <td align="center">ACTIVE_SCAN</td>
       * <td align="center">AF sweep done</td>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">Focused, Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">ACTIVE_SCAN</td>
       * <td align="center">AF sweep done</td>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">Not focused, Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">ACTIVE_SCAN</td>
       * <td align="center">AF_CANCEL</td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Cancel/reset AF, Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">AF_CANCEL</td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Cancel/reset AF</td>
       * </tr>
       * <tr>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">ACTIVE_SCAN</td>
       * <td align="center">Start new sweep, Lens now moving</td>
       * </tr>
       * <tr>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">AF_CANCEL</td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Cancel/reset AF</td>
       * </tr>
       * <tr>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">ACTIVE_SCAN</td>
       * <td align="center">Start new sweep, Lens now moving</td>
       * </tr>
       * <tr>
       * <td align="center">Any state</td>
       * <td align="center">Mode change</td>
       * <td align="center">INACTIVE</td>
       * <td align="center"></td>
       * </tr>
       * </tbody>
       * </table>
       * <p>For the above table, the camera device may skip reporting any state changes that happen
       * without application intervention (i.e. mode switch, trigger, locking). Any state that
       * can be skipped in that manner is called a transient state.</p>
       * <p>For example, for these AF modes (AF_MODE_AUTO and AF_MODE_MACRO), in addition to the
       * state transitions listed in above table, it is also legal for the camera device to skip
       * one or more transient states between two results. See below table for examples:</p>
       * <table>
       * <thead>
       * <tr>
       * <th align="center">State</th>
       * <th align="center">Transition Cause</th>
       * <th align="center">New State</th>
       * <th align="center">Notes</th>
       * </tr>
       * </thead>
       * <tbody>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">Focus is already good or good after a scan, lens is now locked.</td>
       * </tr>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">Focus failed after a scan, lens is now locked.</td>
       * </tr>
       * <tr>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">Focus is already good or good after a scan, lens is now locked.</td>
       * </tr>
       * <tr>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">Focus is good after a scan, lens is not locked.</td>
       * </tr>
       * </tbody>
       * </table>
       * <p>When {@link CaptureRequest#CONTROL_AF_MODE android.control.afMode} is AF_MODE_CONTINUOUS_VIDEO:</p>
       * <table>
       * <thead>
       * <tr>
       * <th align="center">State</th>
       * <th align="center">Transition Cause</th>
       * <th align="center">New State</th>
       * <th align="center">Notes</th>
       * </tr>
       * </thead>
       * <tbody>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">Camera device initiates new scan</td>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">Start AF scan, Lens now moving</td>
       * </tr>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">AF state query, Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">Camera device completes current scan</td>
       * <td align="center">PASSIVE_FOCUSED</td>
       * <td align="center">End AF scan, Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">Camera device fails current scan</td>
       * <td align="center">PASSIVE_UNFOCUSED</td>
       * <td align="center">End AF scan, Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">Immediate transition, if focus is good. Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">Immediate transition, if focus is bad. Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">AF_CANCEL</td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Reset lens position, Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_FOCUSED</td>
       * <td align="center">Camera device initiates new scan</td>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">Start AF scan, Lens now moving</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_UNFOCUSED</td>
       * <td align="center">Camera device initiates new scan</td>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">Start AF scan, Lens now moving</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_FOCUSED</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">Immediate transition, lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_UNFOCUSED</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">Immediate transition, lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">No effect</td>
       * </tr>
       * <tr>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">AF_CANCEL</td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Restart AF scan</td>
       * </tr>
       * <tr>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">No effect</td>
       * </tr>
       * <tr>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">AF_CANCEL</td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Restart AF scan</td>
       * </tr>
       * </tbody>
       * </table>
       * <p>When {@link CaptureRequest#CONTROL_AF_MODE android.control.afMode} is AF_MODE_CONTINUOUS_PICTURE:</p>
       * <table>
       * <thead>
       * <tr>
       * <th align="center">State</th>
       * <th align="center">Transition Cause</th>
       * <th align="center">New State</th>
       * <th align="center">Notes</th>
       * </tr>
       * </thead>
       * <tbody>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">Camera device initiates new scan</td>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">Start AF scan, Lens now moving</td>
       * </tr>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">AF state query, Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">Camera device completes current scan</td>
       * <td align="center">PASSIVE_FOCUSED</td>
       * <td align="center">End AF scan, Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">Camera device fails current scan</td>
       * <td align="center">PASSIVE_UNFOCUSED</td>
       * <td align="center">End AF scan, Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">Eventual transition once the focus is good. Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">Eventual transition if cannot find focus. Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">AF_CANCEL</td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Reset lens position, Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_FOCUSED</td>
       * <td align="center">Camera device initiates new scan</td>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">Start AF scan, Lens now moving</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_UNFOCUSED</td>
       * <td align="center">Camera device initiates new scan</td>
       * <td align="center">PASSIVE_SCAN</td>
       * <td align="center">Start AF scan, Lens now moving</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_FOCUSED</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">Immediate trans. Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">PASSIVE_UNFOCUSED</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">Immediate trans. Lens now locked</td>
       * </tr>
       * <tr>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">No effect</td>
       * </tr>
       * <tr>
       * <td align="center">FOCUSED_LOCKED</td>
       * <td align="center">AF_CANCEL</td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Restart AF scan</td>
       * </tr>
       * <tr>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">AF_TRIGGER</td>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">No effect</td>
       * </tr>
       * <tr>
       * <td align="center">NOT_FOCUSED_LOCKED</td>
       * <td align="center">AF_CANCEL</td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Restart AF scan</td>
       * </tr>
       * </tbody>
       * </table>
       * <p>When switch between AF_MODE_CONTINUOUS_* (CAF modes) and AF_MODE_AUTO/AF_MODE_MACRO
       * (AUTO modes), the initial INACTIVE or PASSIVE_SCAN states may be skipped by the
       * camera device. When a trigger is included in a mode switch request, the trigger
       * will be evaluated in the context of the new mode in the request.
       * See below table for examples:</p>
       * <table>
       * <thead>
       * <tr>
       * <th align="center">State</th>
       * <th align="center">Transition Cause</th>
       * <th align="center">New State</th>
       * <th align="center">Notes</th>
       * </tr>
       * </thead>
       * <tbody>
       * <tr>
       * <td align="center">any state</td>
       * <td align="center">CAF--&gt;AUTO mode switch</td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Mode switch without trigger, initial state must be INACTIVE</td>
       * </tr>
       * <tr>
       * <td align="center">any state</td>
       * <td align="center">CAF--&gt;AUTO mode switch with AF_TRIGGER</td>
       * <td align="center">trigger-reachable states from INACTIVE</td>
       * <td align="center">Mode switch with trigger, INACTIVE is skipped</td>
       * </tr>
       * <tr>
       * <td align="center">any state</td>
       * <td align="center">AUTO--&gt;CAF mode switch</td>
       * <td align="center">passively reachable states from INACTIVE</td>
       * <td align="center">Mode switch without trigger, passive transient state is skipped</td>
       * </tr>
       * </tbody>
       * </table>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_AF_STATE_INACTIVE INACTIVE}</li>
       *   <li>{@link #CONTROL_AF_STATE_PASSIVE_SCAN PASSIVE_SCAN}</li>
       *   <li>{@link #CONTROL_AF_STATE_PASSIVE_FOCUSED PASSIVE_FOCUSED}</li>
       *   <li>{@link #CONTROL_AF_STATE_ACTIVE_SCAN ACTIVE_SCAN}</li>
       *   <li>{@link #CONTROL_AF_STATE_FOCUSED_LOCKED FOCUSED_LOCKED}</li>
       *   <li>{@link #CONTROL_AF_STATE_NOT_FOCUSED_LOCKED NOT_FOCUSED_LOCKED}</li>
       *   <li>{@link #CONTROL_AF_STATE_PASSIVE_UNFOCUSED PASSIVE_UNFOCUSED}</li>
       * </ul></p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#CONTROL_AF_MODE
       * @see CaptureRequest#CONTROL_MODE
       * @see CaptureRequest#CONTROL_SCENE_MODE
       * @see #CONTROL_AF_STATE_INACTIVE
       * @see #CONTROL_AF_STATE_PASSIVE_SCAN
       * @see #CONTROL_AF_STATE_PASSIVE_FOCUSED
       * @see #CONTROL_AF_STATE_ACTIVE_SCAN
       * @see #CONTROL_AF_STATE_FOCUSED_LOCKED
       * @see #CONTROL_AF_STATE_NOT_FOCUSED_LOCKED
       * @see #CONTROL_AF_STATE_PASSIVE_UNFOCUSED
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_AF_STATE =
              new Key<Integer>("android.control.afState", int.class);
  
      /**
       * <p>Whether auto-white balance (AWB) is currently locked to its
       * latest calculated values.</p>
       * <p>When set to <code>true</code> (ON), the AWB algorithm is locked to its latest parameters,
       * and will not change color balance settings until the lock is set to <code>false</code> (OFF).</p>
       * <p>Since the camera device has a pipeline of in-flight requests, the settings that
       * get locked do not necessarily correspond to the settings that were present in the
       * latest capture result received from the camera device, since additional captures
       * and AWB updates may have occurred even before the result was sent out. If an
       * application is switching between automatic and manual control and wishes to eliminate
       * any flicker during the switch, the following procedure is recommended:</p>
       * <ol>
       * <li>Starting in auto-AWB mode:</li>
       * <li>Lock AWB</li>
       * <li>Wait for the first result to be output that has the AWB locked</li>
       * <li>Copy AWB settings from that result into a request, set the request to manual AWB</li>
       * <li>Submit the capture request, proceed to run manual AWB as desired.</li>
       * </ol>
       * <p>Note that AWB lock is only meaningful when
       * {@link CaptureRequest#CONTROL_AWB_MODE android.control.awbMode} is in the AUTO mode; in other modes,
       * AWB is already fixed to a specific setting.</p>
       * <p>Some LEGACY devices may not support ON; the value is then overridden to OFF.</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#CONTROL_AWB_MODE
       */
      @PublicKey
      @NonNull
      public static final Key<Boolean> CONTROL_AWB_LOCK =
              new Key<Boolean>("android.control.awbLock", boolean.class);
  
      /**
       * <p>Whether auto-white balance (AWB) is currently setting the color
       * transform fields, and what its illumination target
       * is.</p>
       * <p>This control is only effective if {@link CaptureRequest#CONTROL_MODE android.control.mode} is AUTO.</p>
       * <p>When set to the ON mode, the camera device's auto-white balance
       * routine is enabled, overriding the application's selected
       * {@link CaptureRequest#COLOR_CORRECTION_TRANSFORM android.colorCorrection.transform}, {@link CaptureRequest#COLOR_CORRECTION_GAINS android.colorCorrection.gains} and
       * {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode}. Note that when {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode}
       * is OFF, the behavior of AWB is device dependent. It is recommened to
       * also set AWB mode to OFF or lock AWB by using {@link CaptureRequest#CONTROL_AWB_LOCK android.control.awbLock} before
       * setting AE mode to OFF.</p>
       * <p>When set to the OFF mode, the camera device's auto-white balance
       * routine is disabled. The application manually controls the white
       * balance by {@link CaptureRequest#COLOR_CORRECTION_TRANSFORM android.colorCorrection.transform}, {@link CaptureRequest#COLOR_CORRECTION_GAINS android.colorCorrection.gains}
       * and {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode}.</p>
       * <p>When set to any other modes, the camera device's auto-white
       * balance routine is disabled. The camera device uses each
       * particular illumination target for white balance
       * adjustment. The application's values for
       * {@link CaptureRequest#COLOR_CORRECTION_TRANSFORM android.colorCorrection.transform},
       * {@link CaptureRequest#COLOR_CORRECTION_GAINS android.colorCorrection.gains} and
       * {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode} are ignored.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_AWB_MODE_OFF OFF}</li>
       *   <li>{@link #CONTROL_AWB_MODE_AUTO AUTO}</li>
       *   <li>{@link #CONTROL_AWB_MODE_INCANDESCENT INCANDESCENT}</li>
       *   <li>{@link #CONTROL_AWB_MODE_FLUORESCENT FLUORESCENT}</li>
       *   <li>{@link #CONTROL_AWB_MODE_WARM_FLUORESCENT WARM_FLUORESCENT}</li>
       *   <li>{@link #CONTROL_AWB_MODE_DAYLIGHT DAYLIGHT}</li>
       *   <li>{@link #CONTROL_AWB_MODE_CLOUDY_DAYLIGHT CLOUDY_DAYLIGHT}</li>
       *   <li>{@link #CONTROL_AWB_MODE_TWILIGHT TWILIGHT}</li>
       *   <li>{@link #CONTROL_AWB_MODE_SHADE SHADE}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#CONTROL_AWB_AVAILABLE_MODES android.control.awbAvailableModes}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#COLOR_CORRECTION_GAINS
       * @see CaptureRequest#COLOR_CORRECTION_MODE
       * @see CaptureRequest#COLOR_CORRECTION_TRANSFORM
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CameraCharacteristics#CONTROL_AWB_AVAILABLE_MODES
       * @see CaptureRequest#CONTROL_AWB_LOCK
       * @see CaptureRequest#CONTROL_MODE
       * @see #CONTROL_AWB_MODE_OFF
       * @see #CONTROL_AWB_MODE_AUTO
       * @see #CONTROL_AWB_MODE_INCANDESCENT
       * @see #CONTROL_AWB_MODE_FLUORESCENT
       * @see #CONTROL_AWB_MODE_WARM_FLUORESCENT
       * @see #CONTROL_AWB_MODE_DAYLIGHT
       * @see #CONTROL_AWB_MODE_CLOUDY_DAYLIGHT
       * @see #CONTROL_AWB_MODE_TWILIGHT
       * @see #CONTROL_AWB_MODE_SHADE
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_AWB_MODE =
              new Key<Integer>("android.control.awbMode", int.class);
  
      /**
       * <p>List of metering areas to use for auto-white-balance illuminant
       * estimation.</p>
       * <p>Not available if {@link CameraCharacteristics#CONTROL_MAX_REGIONS_AWB android.control.maxRegionsAwb} is 0.
       * Otherwise will always be present.</p>
       * <p>The maximum number of regions supported by the device is determined by the value
       * of {@link CameraCharacteristics#CONTROL_MAX_REGIONS_AWB android.control.maxRegionsAwb}.</p>
       * <p>For devices not supporting {@link CaptureRequest#DISTORTION_CORRECTION_MODE android.distortionCorrection.mode} control, the coordinate
       * system always follows that of {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, with (0,0) being
       * the top-left pixel in the active pixel array, and
       * ({@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.width - 1,
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.height - 1) being the bottom-right pixel in the
       * active pixel array.</p>
       * <p>For devices supporting {@link CaptureRequest#DISTORTION_CORRECTION_MODE android.distortionCorrection.mode} control, the coordinate
       * system depends on the mode being set.
       * When the distortion correction mode is OFF, the coordinate system follows
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}, with
       * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array, and
       * ({@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}.width - 1,
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}.height - 1) being the bottom-right
       * pixel in the pre-correction active pixel array.
       * When the distortion correction mode is not OFF, the coordinate system follows
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, with
       * <code>(0, 0)</code> being the top-left pixel of the active array, and
       * ({@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.width - 1,
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.height - 1) being the bottom-right pixel in the
       * active pixel array.</p>
       * <p>The weight must range from 0 to 1000, and represents a weight
       * for every pixel in the area. This means that a large metering area
       * with the same weight as a smaller area will have more effect in
       * the metering result. Metering areas can partially overlap and the
       * camera device will add the weights in the overlap region.</p>
       * <p>The weights are relative to weights of other white balance metering regions, so if
       * only one region is used, all non-zero weights will have the same effect. A region with
       * 0 weight is ignored.</p>
       * <p>If all regions have 0 weight, then no specific metering area needs to be used by the
       * camera device.</p>
       * <p>If the metering region is outside the used {@link CaptureRequest#SCALER_CROP_REGION android.scaler.cropRegion} returned in
       * capture result metadata, the camera device will ignore the sections outside the crop
       * region and output only the intersection rectangle as the metering region in the result
       * metadata.  If the region is entirely outside the crop region, it will be ignored and
       * not reported in the result metadata.</p>
       * <p><b>Units</b>: Pixel coordinates within {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize} or
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize} depending on
       * distortion correction capability and mode</p>
       * <p><b>Range of valid values:</b><br>
       * Coordinates must be between <code>[(0,0), (width, height))</code> of
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize} or {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}
       * depending on distortion correction capability and mode</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CameraCharacteristics#CONTROL_MAX_REGIONS_AWB
       * @see CaptureRequest#DISTORTION_CORRECTION_MODE
       * @see CaptureRequest#SCALER_CROP_REGION
       * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
       * @see CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
       */
      @PublicKey
      @NonNull
      public static final Key<android.hardware.camera2.params.MeteringRectangle[]> CONTROL_AWB_REGIONS =
              new Key<android.hardware.camera2.params.MeteringRectangle[]>("android.control.awbRegions", android.hardware.camera2.params.MeteringRectangle[].class);
  
      /**
       * <p>Information to the camera device 3A (auto-exposure,
       * auto-focus, auto-white balance) routines about the purpose
       * of this capture, to help the camera device to decide optimal 3A
       * strategy.</p>
       * <p>This control (except for MANUAL) is only effective if
       * <code>{@link CaptureRequest#CONTROL_MODE android.control.mode} != OFF</code> and any 3A routine is active.</p>
       * <p>All intents are supported by all devices, except that:
       *   * ZERO_SHUTTER_LAG will be supported if {@link CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES android.request.availableCapabilities} contains
       * PRIVATE_REPROCESSING or YUV_REPROCESSING.
       *   * MANUAL will be supported if {@link CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES android.request.availableCapabilities} contains
       * MANUAL_SENSOR.
       *   * MOTION_TRACKING will be supported if {@link CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES android.request.availableCapabilities} contains
       * MOTION_TRACKING.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_CAPTURE_INTENT_CUSTOM CUSTOM}</li>
       *   <li>{@link #CONTROL_CAPTURE_INTENT_PREVIEW PREVIEW}</li>
       *   <li>{@link #CONTROL_CAPTURE_INTENT_STILL_CAPTURE STILL_CAPTURE}</li>
       *   <li>{@link #CONTROL_CAPTURE_INTENT_VIDEO_RECORD VIDEO_RECORD}</li>
       *   <li>{@link #CONTROL_CAPTURE_INTENT_VIDEO_SNAPSHOT VIDEO_SNAPSHOT}</li>
       *   <li>{@link #CONTROL_CAPTURE_INTENT_ZERO_SHUTTER_LAG ZERO_SHUTTER_LAG}</li>
       *   <li>{@link #CONTROL_CAPTURE_INTENT_MANUAL MANUAL}</li>
       *   <li>{@link #CONTROL_CAPTURE_INTENT_MOTION_TRACKING MOTION_TRACKING}</li>
       * </ul></p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#CONTROL_MODE
       * @see CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES
       * @see #CONTROL_CAPTURE_INTENT_CUSTOM
       * @see #CONTROL_CAPTURE_INTENT_PREVIEW
       * @see #CONTROL_CAPTURE_INTENT_STILL_CAPTURE
       * @see #CONTROL_CAPTURE_INTENT_VIDEO_RECORD
       * @see #CONTROL_CAPTURE_INTENT_VIDEO_SNAPSHOT
       * @see #CONTROL_CAPTURE_INTENT_ZERO_SHUTTER_LAG
       * @see #CONTROL_CAPTURE_INTENT_MANUAL
       * @see #CONTROL_CAPTURE_INTENT_MOTION_TRACKING
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_CAPTURE_INTENT =
              new Key<Integer>("android.control.captureIntent", int.class);
  
      /**
       * <p>Current state of auto-white balance (AWB) algorithm.</p>
       * <p>Switching between or enabling AWB modes ({@link CaptureRequest#CONTROL_AWB_MODE android.control.awbMode}) always
       * resets the AWB state to INACTIVE. Similarly, switching between {@link CaptureRequest#CONTROL_MODE android.control.mode},
       * or {@link CaptureRequest#CONTROL_SCENE_MODE android.control.sceneMode} if <code>{@link CaptureRequest#CONTROL_MODE android.control.mode} == USE_SCENE_MODE</code> resets all
       * the algorithm states to INACTIVE.</p>
       * <p>The camera device can do several state transitions between two results, if it is
       * allowed by the state transition table. So INACTIVE may never actually be seen in
       * a result.</p>
       * <p>The state in the result is the state for this image (in sync with this image): if
       * AWB state becomes CONVERGED, then the image data associated with this result should
       * be good to use.</p>
       * <p>Below are state transition tables for different AWB modes.</p>
       * <p>When <code>{@link CaptureRequest#CONTROL_AWB_MODE android.control.awbMode} != AWB_MODE_AUTO</code>:</p>
       * <table>
       * <thead>
       * <tr>
       * <th align="center">State</th>
       * <th align="center">Transition Cause</th>
       * <th align="center">New State</th>
       * <th align="center">Notes</th>
       * </tr>
       * </thead>
       * <tbody>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center"></td>
       * <td align="center">INACTIVE</td>
       * <td align="center">Camera device auto white balance algorithm is disabled</td>
       * </tr>
       * </tbody>
       * </table>
       * <p>When {@link CaptureRequest#CONTROL_AWB_MODE android.control.awbMode} is AWB_MODE_AUTO:</p>
       * <table>
       * <thead>
       * <tr>
       * <th align="center">State</th>
       * <th align="center">Transition Cause</th>
       * <th align="center">New State</th>
       * <th align="center">Notes</th>
       * </tr>
       * </thead>
       * <tbody>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">Camera device initiates AWB scan</td>
       * <td align="center">SEARCHING</td>
       * <td align="center">Values changing</td>
       * </tr>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AWB_LOCK android.control.awbLock} is ON</td>
       * <td align="center">LOCKED</td>
       * <td align="center">Values locked</td>
       * </tr>
       * <tr>
       * <td align="center">SEARCHING</td>
       * <td align="center">Camera device finishes AWB scan</td>
       * <td align="center">CONVERGED</td>
       * <td align="center">Good values, not changing</td>
       * </tr>
       * <tr>
       * <td align="center">SEARCHING</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AWB_LOCK android.control.awbLock} is ON</td>
       * <td align="center">LOCKED</td>
       * <td align="center">Values locked</td>
       * </tr>
       * <tr>
       * <td align="center">CONVERGED</td>
       * <td align="center">Camera device initiates AWB scan</td>
       * <td align="center">SEARCHING</td>
       * <td align="center">Values changing</td>
       * </tr>
       * <tr>
       * <td align="center">CONVERGED</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AWB_LOCK android.control.awbLock} is ON</td>
       * <td align="center">LOCKED</td>
       * <td align="center">Values locked</td>
       * </tr>
       * <tr>
       * <td align="center">LOCKED</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AWB_LOCK android.control.awbLock} is OFF</td>
       * <td align="center">SEARCHING</td>
       * <td align="center">Values not good after unlock</td>
       * </tr>
       * </tbody>
       * </table>
       * <p>For the above table, the camera device may skip reporting any state changes that happen
       * without application intervention (i.e. mode switch, trigger, locking). Any state that
       * can be skipped in that manner is called a transient state.</p>
       * <p>For example, for this AWB mode (AWB_MODE_AUTO), in addition to the state transitions
       * listed in above table, it is also legal for the camera device to skip one or more
       * transient states between two results. See below table for examples:</p>
       * <table>
       * <thead>
       * <tr>
       * <th align="center">State</th>
       * <th align="center">Transition Cause</th>
       * <th align="center">New State</th>
       * <th align="center">Notes</th>
       * </tr>
       * </thead>
       * <tbody>
       * <tr>
       * <td align="center">INACTIVE</td>
       * <td align="center">Camera device finished AWB scan</td>
       * <td align="center">CONVERGED</td>
       * <td align="center">Values are already good, transient states are skipped by camera device.</td>
       * </tr>
       * <tr>
       * <td align="center">LOCKED</td>
       * <td align="center">{@link CaptureRequest#CONTROL_AWB_LOCK android.control.awbLock} is OFF</td>
       * <td align="center">CONVERGED</td>
       * <td align="center">Values good after unlock, transient states are skipped by camera device.</td>
       * </tr>
       * </tbody>
       * </table>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_AWB_STATE_INACTIVE INACTIVE}</li>
       *   <li>{@link #CONTROL_AWB_STATE_SEARCHING SEARCHING}</li>
       *   <li>{@link #CONTROL_AWB_STATE_CONVERGED CONVERGED}</li>
       *   <li>{@link #CONTROL_AWB_STATE_LOCKED LOCKED}</li>
       * </ul></p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Limited capability</b> -
       * Present on all camera devices that report being at least {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED HARDWARE_LEVEL_LIMITED} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#CONTROL_AWB_LOCK
       * @see CaptureRequest#CONTROL_AWB_MODE
       * @see CaptureRequest#CONTROL_MODE
       * @see CaptureRequest#CONTROL_SCENE_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see #CONTROL_AWB_STATE_INACTIVE
       * @see #CONTROL_AWB_STATE_SEARCHING
       * @see #CONTROL_AWB_STATE_CONVERGED
       * @see #CONTROL_AWB_STATE_LOCKED
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_AWB_STATE =
              new Key<Integer>("android.control.awbState", int.class);
  
      /**
       * <p>A special color effect to apply.</p>
       * <p>When this mode is set, a color effect will be applied
       * to images produced by the camera device. The interpretation
       * and implementation of these color effects is left to the
       * implementor of the camera device, and should not be
       * depended on to be consistent (or present) across all
       * devices.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_EFFECT_MODE_OFF OFF}</li>
       *   <li>{@link #CONTROL_EFFECT_MODE_MONO MONO}</li>
       *   <li>{@link #CONTROL_EFFECT_MODE_NEGATIVE NEGATIVE}</li>
       *   <li>{@link #CONTROL_EFFECT_MODE_SOLARIZE SOLARIZE}</li>
       *   <li>{@link #CONTROL_EFFECT_MODE_SEPIA SEPIA}</li>
       *   <li>{@link #CONTROL_EFFECT_MODE_POSTERIZE POSTERIZE}</li>
       *   <li>{@link #CONTROL_EFFECT_MODE_WHITEBOARD WHITEBOARD}</li>
       *   <li>{@link #CONTROL_EFFECT_MODE_BLACKBOARD BLACKBOARD}</li>
       *   <li>{@link #CONTROL_EFFECT_MODE_AQUA AQUA}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#CONTROL_AVAILABLE_EFFECTS android.control.availableEffects}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CameraCharacteristics#CONTROL_AVAILABLE_EFFECTS
       * @see #CONTROL_EFFECT_MODE_OFF
       * @see #CONTROL_EFFECT_MODE_MONO
       * @see #CONTROL_EFFECT_MODE_NEGATIVE
       * @see #CONTROL_EFFECT_MODE_SOLARIZE
       * @see #CONTROL_EFFECT_MODE_SEPIA
       * @see #CONTROL_EFFECT_MODE_POSTERIZE
       * @see #CONTROL_EFFECT_MODE_WHITEBOARD
       * @see #CONTROL_EFFECT_MODE_BLACKBOARD
       * @see #CONTROL_EFFECT_MODE_AQUA
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_EFFECT_MODE =
              new Key<Integer>("android.control.effectMode", int.class);
  
      /**
       * <p>Overall mode of 3A (auto-exposure, auto-white-balance, auto-focus) control
       * routines.</p>
       * <p>This is a top-level 3A control switch. When set to OFF, all 3A control
       * by the camera device is disabled. The application must set the fields for
       * capture parameters itself.</p>
       * <p>When set to AUTO, the individual algorithm controls in
       * android.control.* are in effect, such as {@link CaptureRequest#CONTROL_AF_MODE android.control.afMode}.</p>
       * <p>When set to USE_SCENE_MODE, the individual controls in
       * android.control.* are mostly disabled, and the camera device
       * implements one of the scene mode settings (such as ACTION,
       * SUNSET, or PARTY) as it wishes. The camera device scene mode
       * 3A settings are provided by {@link android.hardware.camera2.CaptureResult capture results}.</p>
       * <p>When set to OFF_KEEP_STATE, it is similar to OFF mode, the only difference
       * is that this frame will not be used by camera device background 3A statistics
       * update, as if this frame is never captured. This mode can be used in the scenario
       * where the application doesn't want a 3A manual control capture to affect
       * the subsequent auto 3A capture results.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_MODE_OFF OFF}</li>
       *   <li>{@link #CONTROL_MODE_AUTO AUTO}</li>
       *   <li>{@link #CONTROL_MODE_USE_SCENE_MODE USE_SCENE_MODE}</li>
       *   <li>{@link #CONTROL_MODE_OFF_KEEP_STATE OFF_KEEP_STATE}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#CONTROL_AVAILABLE_MODES android.control.availableModes}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#CONTROL_AF_MODE
       * @see CameraCharacteristics#CONTROL_AVAILABLE_MODES
       * @see #CONTROL_MODE_OFF
       * @see #CONTROL_MODE_AUTO
       * @see #CONTROL_MODE_USE_SCENE_MODE
       * @see #CONTROL_MODE_OFF_KEEP_STATE
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_MODE =
              new Key<Integer>("android.control.mode", int.class);
  
      /**
       * <p>Control for which scene mode is currently active.</p>
       * <p>Scene modes are custom camera modes optimized for a certain set of conditions and
       * capture settings.</p>
       * <p>This is the mode that that is active when
       * <code>{@link CaptureRequest#CONTROL_MODE android.control.mode} == USE_SCENE_MODE</code>. Aside from FACE_PRIORITY, these modes will
       * disable {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode}, {@link CaptureRequest#CONTROL_AWB_MODE android.control.awbMode}, and {@link CaptureRequest#CONTROL_AF_MODE android.control.afMode}
       * while in use.</p>
       * <p>The interpretation and implementation of these scene modes is left
       * to the implementor of the camera device. Their behavior will not be
       * consistent across all devices, and any given device may only implement
       * a subset of these modes.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_SCENE_MODE_DISABLED DISABLED}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_FACE_PRIORITY FACE_PRIORITY}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_ACTION ACTION}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_PORTRAIT PORTRAIT}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_LANDSCAPE LANDSCAPE}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_NIGHT NIGHT}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_NIGHT_PORTRAIT NIGHT_PORTRAIT}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_THEATRE THEATRE}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_BEACH BEACH}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_SNOW SNOW}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_SUNSET SUNSET}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_STEADYPHOTO STEADYPHOTO}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_FIREWORKS FIREWORKS}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_SPORTS SPORTS}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_PARTY PARTY}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_CANDLELIGHT CANDLELIGHT}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_BARCODE BARCODE}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_HIGH_SPEED_VIDEO HIGH_SPEED_VIDEO}</li>
       *   <li>{@link #CONTROL_SCENE_MODE_HDR HDR}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#CONTROL_AVAILABLE_SCENE_MODES android.control.availableSceneModes}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CaptureRequest#CONTROL_AF_MODE
       * @see CameraCharacteristics#CONTROL_AVAILABLE_SCENE_MODES
       * @see CaptureRequest#CONTROL_AWB_MODE
       * @see CaptureRequest#CONTROL_MODE
       * @see #CONTROL_SCENE_MODE_DISABLED
       * @see #CONTROL_SCENE_MODE_FACE_PRIORITY
       * @see #CONTROL_SCENE_MODE_ACTION
       * @see #CONTROL_SCENE_MODE_PORTRAIT
       * @see #CONTROL_SCENE_MODE_LANDSCAPE
       * @see #CONTROL_SCENE_MODE_NIGHT
       * @see #CONTROL_SCENE_MODE_NIGHT_PORTRAIT
       * @see #CONTROL_SCENE_MODE_THEATRE
       * @see #CONTROL_SCENE_MODE_BEACH
       * @see #CONTROL_SCENE_MODE_SNOW
       * @see #CONTROL_SCENE_MODE_SUNSET
       * @see #CONTROL_SCENE_MODE_STEADYPHOTO
       * @see #CONTROL_SCENE_MODE_FIREWORKS
       * @see #CONTROL_SCENE_MODE_SPORTS
       * @see #CONTROL_SCENE_MODE_PARTY
       * @see #CONTROL_SCENE_MODE_CANDLELIGHT
       * @see #CONTROL_SCENE_MODE_BARCODE
       * @see #CONTROL_SCENE_MODE_HIGH_SPEED_VIDEO
       * @see #CONTROL_SCENE_MODE_HDR
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_SCENE_MODE =
              new Key<Integer>("android.control.sceneMode", int.class);
  
      /**
       * <p>Whether video stabilization is
       * active.</p>
       * <p>Video stabilization automatically warps images from
       * the camera in order to stabilize motion between consecutive frames.</p>
       * <p>If enabled, video stabilization can modify the
       * {@link CaptureRequest#SCALER_CROP_REGION android.scaler.cropRegion} to keep the video stream stabilized.</p>
       * <p>Switching between different video stabilization modes may take several
       * frames to initialize, the camera device will report the current mode
       * in capture result metadata. For example, When "ON" mode is requested,
       * the video stabilization modes in the first several capture results may
       * still be "OFF", and it will become "ON" when the initialization is
       * done.</p>
       * <p>In addition, not all recording sizes or frame rates may be supported for
       * stabilization by a device that reports stabilization support. It is guaranteed
       * that an output targeting a MediaRecorder or MediaCodec will be stabilized if
       * the recording resolution is less than or equal to 1920 x 1080 (width less than
       * or equal to 1920, height less than or equal to 1080), and the recording
       * frame rate is less than or equal to 30fps.  At other sizes, the CaptureResult
       * {@link CaptureRequest#CONTROL_VIDEO_STABILIZATION_MODE android.control.videoStabilizationMode} field will return
       * OFF if the recording output is not stabilized, or if there are no output
       * Surface types that can be stabilized.</p>
       * <p>If a camera device supports both this mode and OIS
       * ({@link CaptureRequest#LENS_OPTICAL_STABILIZATION_MODE android.lens.opticalStabilizationMode}), turning both modes on may
       * produce undesirable interaction, so it is recommended not to enable
       * both at the same time.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_VIDEO_STABILIZATION_MODE_OFF OFF}</li>
       *   <li>{@link #CONTROL_VIDEO_STABILIZATION_MODE_ON ON}</li>
       * </ul></p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#CONTROL_VIDEO_STABILIZATION_MODE
       * @see CaptureRequest#LENS_OPTICAL_STABILIZATION_MODE
       * @see CaptureRequest#SCALER_CROP_REGION
       * @see #CONTROL_VIDEO_STABILIZATION_MODE_OFF
       * @see #CONTROL_VIDEO_STABILIZATION_MODE_ON
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_VIDEO_STABILIZATION_MODE =
              new Key<Integer>("android.control.videoStabilizationMode", int.class);
  
      /**
       * <p>The amount of additional sensitivity boost applied to output images
       * after RAW sensor data is captured.</p>
       * <p>Some camera devices support additional digital sensitivity boosting in the
       * camera processing pipeline after sensor RAW image is captured.
       * Such a boost will be applied to YUV/JPEG format output images but will not
       * have effect on RAW output formats like RAW_SENSOR, RAW10, RAW12 or RAW_OPAQUE.</p>
       * <p>This key will be <code>null</code> for devices that do not support any RAW format
       * outputs. For devices that do support RAW format outputs, this key will always
       * present, and if a device does not support post RAW sensitivity boost, it will
       * list <code>100</code> in this key.</p>
       * <p>If the camera device cannot apply the exact boost requested, it will reduce the
       * boost to the nearest supported value.
       * The final boost value used will be available in the output capture result.</p>
       * <p>For devices that support post RAW sensitivity boost, the YUV/JPEG output images
       * of such device will have the total sensitivity of
       * <code>{@link CaptureRequest#SENSOR_SENSITIVITY android.sensor.sensitivity} * {@link CaptureRequest#CONTROL_POST_RAW_SENSITIVITY_BOOST android.control.postRawSensitivityBoost} / 100</code>
       * The sensitivity of RAW format images will always be <code>{@link CaptureRequest#SENSOR_SENSITIVITY android.sensor.sensitivity}</code></p>
       * <p>This control is only effective if {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} or {@link CaptureRequest#CONTROL_MODE android.control.mode} is set to
       * OFF; otherwise the auto-exposure algorithm will override this value.</p>
       * <p><b>Units</b>: ISO arithmetic units, the same as {@link CaptureRequest#SENSOR_SENSITIVITY android.sensor.sensitivity}</p>
       * <p><b>Range of valid values:</b><br>
       * {@link CameraCharacteristics#CONTROL_POST_RAW_SENSITIVITY_BOOST_RANGE android.control.postRawSensitivityBoostRange}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CaptureRequest#CONTROL_MODE
       * @see CaptureRequest#CONTROL_POST_RAW_SENSITIVITY_BOOST
       * @see CameraCharacteristics#CONTROL_POST_RAW_SENSITIVITY_BOOST_RANGE
       * @see CaptureRequest#SENSOR_SENSITIVITY
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_POST_RAW_SENSITIVITY_BOOST =
              new Key<Integer>("android.control.postRawSensitivityBoost", int.class);
  
      /**
       * <p>Allow camera device to enable zero-shutter-lag mode for requests with
       * {@link CaptureRequest#CONTROL_CAPTURE_INTENT android.control.captureIntent} == STILL_CAPTURE.</p>
       * <p>If enableZsl is <code>true</code>, the camera device may enable zero-shutter-lag mode for requests with
       * STILL_CAPTURE capture intent. The camera device may use images captured in the past to
       * produce output images for a zero-shutter-lag request. The result metadata including the
       * {@link CaptureResult#SENSOR_TIMESTAMP android.sensor.timestamp} reflects the source frames used to produce output images.
       * Therefore, the contents of the output images and the result metadata may be out of order
       * compared to previous regular requests. enableZsl does not affect requests with other
       * capture intents.</p>
       * <p>For example, when requests are submitted in the following order:
       *   Request A: enableZsl is ON, {@link CaptureRequest#CONTROL_CAPTURE_INTENT android.control.captureIntent} is PREVIEW
       *   Request B: enableZsl is ON, {@link CaptureRequest#CONTROL_CAPTURE_INTENT android.control.captureIntent} is STILL_CAPTURE</p>
       * <p>The output images for request B may have contents captured before the output images for
       * request A, and the result metadata for request B may be older than the result metadata for
       * request A.</p>
       * <p>Note that when enableZsl is <code>true</code>, it is not guaranteed to get output images captured in
       * the past for requests with STILL_CAPTURE capture intent.</p>
       * <p>For applications targeting SDK versions O and newer, the value of enableZsl in
       * TEMPLATE_STILL_CAPTURE template may be <code>true</code>. The value in other templates is always
       * <code>false</code> if present.</p>
       * <p>For applications targeting SDK versions older than O, the value of enableZsl in all
       * capture templates is always <code>false</code> if present.</p>
       * <p>For application-operated ZSL, use CAMERA3_TEMPLATE_ZERO_SHUTTER_LAG template.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CaptureRequest#CONTROL_CAPTURE_INTENT
       * @see CaptureResult#SENSOR_TIMESTAMP
       */
      @PublicKey
      @NonNull
      public static final Key<Boolean> CONTROL_ENABLE_ZSL =
              new Key<Boolean>("android.control.enableZsl", boolean.class);
  
      /**
       * <p>Whether a significant scene change is detected within the currently-set AF
       * region(s).</p>
       * <p>When the camera focus routine detects a change in the scene it is looking at,
       * such as a large shift in camera viewpoint, significant motion in the scene, or a
       * significant illumination change, this value will be set to DETECTED for a single capture
       * result. Otherwise the value will be NOT_DETECTED. The threshold for detection is similar
       * to what would trigger a new passive focus scan to begin in CONTINUOUS autofocus modes.</p>
       * <p>This key will be available if the camera device advertises this key via {@link android.hardware.camera2.CameraCharacteristics#getAvailableCaptureResultKeys }.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #CONTROL_AF_SCENE_CHANGE_NOT_DETECTED NOT_DETECTED}</li>
       *   <li>{@link #CONTROL_AF_SCENE_CHANGE_DETECTED DETECTED}</li>
       * </ul></p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * @see #CONTROL_AF_SCENE_CHANGE_NOT_DETECTED
       * @see #CONTROL_AF_SCENE_CHANGE_DETECTED
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> CONTROL_AF_SCENE_CHANGE =
              new Key<Integer>("android.control.afSceneChange", int.class);
  
      /**
       * <p>Operation mode for edge
       * enhancement.</p>
       * <p>Edge enhancement improves sharpness and details in the captured image. OFF means
       * no enhancement will be applied by the camera device.</p>
       * <p>FAST/HIGH_QUALITY both mean camera device determined enhancement
       * will be applied. HIGH_QUALITY mode indicates that the
       * camera device will use the highest-quality enhancement algorithms,
       * even if it slows down capture rate. FAST means the camera device will
       * not slow down capture rate when applying edge enhancement. FAST may be the same as OFF if
       * edge enhancement will slow down capture rate. Every output stream will have a similar
       * amount of enhancement applied.</p>
       * <p>ZERO_SHUTTER_LAG is meant to be used by applications that maintain a continuous circular
       * buffer of high-resolution images during preview and reprocess image(s) from that buffer
       * into a final capture when triggered by the user. In this mode, the camera device applies
       * edge enhancement to low-resolution streams (below maximum recording resolution) to
       * maximize preview quality, but does not apply edge enhancement to high-resolution streams,
       * since those will be reprocessed later if necessary.</p>
       * <p>For YUV_REPROCESSING, these FAST/HIGH_QUALITY modes both mean that the camera
       * device will apply FAST/HIGH_QUALITY YUV-domain edge enhancement, respectively.
       * The camera device may adjust its internal edge enhancement parameters for best
       * image quality based on the {@link CaptureRequest#REPROCESS_EFFECTIVE_EXPOSURE_FACTOR android.reprocess.effectiveExposureFactor}, if it is set.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #EDGE_MODE_OFF OFF}</li>
       *   <li>{@link #EDGE_MODE_FAST FAST}</li>
       *   <li>{@link #EDGE_MODE_HIGH_QUALITY HIGH_QUALITY}</li>
       *   <li>{@link #EDGE_MODE_ZERO_SHUTTER_LAG ZERO_SHUTTER_LAG}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#EDGE_AVAILABLE_EDGE_MODES android.edge.availableEdgeModes}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#EDGE_AVAILABLE_EDGE_MODES
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CaptureRequest#REPROCESS_EFFECTIVE_EXPOSURE_FACTOR
       * @see #EDGE_MODE_OFF
       * @see #EDGE_MODE_FAST
       * @see #EDGE_MODE_HIGH_QUALITY
       * @see #EDGE_MODE_ZERO_SHUTTER_LAG
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> EDGE_MODE =
              new Key<Integer>("android.edge.mode", int.class);
  
      /**
       * <p>The desired mode for for the camera device's flash control.</p>
       * <p>This control is only effective when flash unit is available
       * (<code>{@link CameraCharacteristics#FLASH_INFO_AVAILABLE android.flash.info.available} == true</code>).</p>
       * <p>When this control is used, the {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} must be set to ON or OFF.
       * Otherwise, the camera device auto-exposure related flash control (ON_AUTO_FLASH,
       * ON_ALWAYS_FLASH, or ON_AUTO_FLASH_REDEYE) will override this control.</p>
       * <p>When set to OFF, the camera device will not fire flash for this capture.</p>
       * <p>When set to SINGLE, the camera device will fire flash regardless of the camera
       * device's auto-exposure routine's result. When used in still capture case, this
       * control should be used along with auto-exposure (AE) precapture metering sequence
       * ({@link CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER android.control.aePrecaptureTrigger}), otherwise, the image may be incorrectly exposed.</p>
       * <p>When set to TORCH, the flash will be on continuously. This mode can be used
       * for use cases such as preview, auto-focus assist, still capture, or video recording.</p>
       * <p>The flash status will be reported by {@link CaptureResult#FLASH_STATE android.flash.state} in the capture result metadata.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #FLASH_MODE_OFF OFF}</li>
       *   <li>{@link #FLASH_MODE_SINGLE SINGLE}</li>
       *   <li>{@link #FLASH_MODE_TORCH TORCH}</li>
       * </ul></p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER
       * @see CameraCharacteristics#FLASH_INFO_AVAILABLE
       * @see CaptureResult#FLASH_STATE
       * @see #FLASH_MODE_OFF
       * @see #FLASH_MODE_SINGLE
       * @see #FLASH_MODE_TORCH
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> FLASH_MODE =
              new Key<Integer>("android.flash.mode", int.class);
  
      /**
       * <p>Current state of the flash
       * unit.</p>
       * <p>When the camera device doesn't have flash unit
       * (i.e. <code>{@link CameraCharacteristics#FLASH_INFO_AVAILABLE android.flash.info.available} == false</code>), this state will always be UNAVAILABLE.
       * Other states indicate the current flash status.</p>
       * <p>In certain conditions, this will be available on LEGACY devices:</p>
       * <ul>
       * <li>Flash-less cameras always return UNAVAILABLE.</li>
       * <li>Using {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} <code>==</code> ON_ALWAYS_FLASH
       *    will always return FIRED.</li>
       * <li>Using {@link CaptureRequest#FLASH_MODE android.flash.mode} <code>==</code> TORCH
       *    will always return FIRED.</li>
       * </ul>
       * <p>In all other conditions the state will not be available on
       * LEGACY devices (i.e. it will be <code>null</code>).</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #FLASH_STATE_UNAVAILABLE UNAVAILABLE}</li>
       *   <li>{@link #FLASH_STATE_CHARGING CHARGING}</li>
       *   <li>{@link #FLASH_STATE_READY READY}</li>
       *   <li>{@link #FLASH_STATE_FIRED FIRED}</li>
       *   <li>{@link #FLASH_STATE_PARTIAL PARTIAL}</li>
       * </ul></p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Limited capability</b> -
       * Present on all camera devices that report being at least {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED HARDWARE_LEVEL_LIMITED} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CameraCharacteristics#FLASH_INFO_AVAILABLE
       * @see CaptureRequest#FLASH_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see #FLASH_STATE_UNAVAILABLE
       * @see #FLASH_STATE_CHARGING
       * @see #FLASH_STATE_READY
       * @see #FLASH_STATE_FIRED
       * @see #FLASH_STATE_PARTIAL
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> FLASH_STATE =
              new Key<Integer>("android.flash.state", int.class);
  
      /**
       * <p>Operational mode for hot pixel correction.</p>
       * <p>Hotpixel correction interpolates out, or otherwise removes, pixels
       * that do not accurately measure the incoming light (i.e. pixels that
       * are stuck at an arbitrary value or are oversensitive).</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #HOT_PIXEL_MODE_OFF OFF}</li>
       *   <li>{@link #HOT_PIXEL_MODE_FAST FAST}</li>
       *   <li>{@link #HOT_PIXEL_MODE_HIGH_QUALITY HIGH_QUALITY}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#HOT_PIXEL_AVAILABLE_HOT_PIXEL_MODES android.hotPixel.availableHotPixelModes}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CameraCharacteristics#HOT_PIXEL_AVAILABLE_HOT_PIXEL_MODES
       * @see #HOT_PIXEL_MODE_OFF
       * @see #HOT_PIXEL_MODE_FAST
       * @see #HOT_PIXEL_MODE_HIGH_QUALITY
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> HOT_PIXEL_MODE =
              new Key<Integer>("android.hotPixel.mode", int.class);
  
      /**
       * <p>A location object to use when generating image GPS metadata.</p>
       * <p>Setting a location object in a request will include the GPS coordinates of the location
       * into any JPEG images captured based on the request. These coordinates can then be
       * viewed by anyone who receives the JPEG image.</p>
       * <p>This tag is also used for HEIC image capture.</p>
       * <p>This key is available on all devices.</p>
       */
      @PublicKey
      @NonNull
      @SyntheticKey
      public static final Key<android.location.Location> JPEG_GPS_LOCATION =
              new Key<android.location.Location>("android.jpeg.gpsLocation", android.location.Location.class);
  
      /**
       * <p>GPS coordinates to include in output JPEG
       * EXIF.</p>
       * <p>This tag is also used for HEIC image capture.</p>
       * <p><b>Range of valid values:</b><br>
       * (-180 - 180], [-90,90], [-inf, inf]</p>
       * <p>This key is available on all devices.</p>
       * @hide
       */
      public static final Key<double[]> JPEG_GPS_COORDINATES =
              new Key<double[]>("android.jpeg.gpsCoordinates", double[].class);
  
      /**
       * <p>32 characters describing GPS algorithm to
       * include in EXIF.</p>
       * <p>This tag is also used for HEIC image capture.</p>
       * <p>This key is available on all devices.</p>
       * @hide
       */
      public static final Key<String> JPEG_GPS_PROCESSING_METHOD =
              new Key<String>("android.jpeg.gpsProcessingMethod", String.class);
  
      /**
       * <p>Time GPS fix was made to include in
       * EXIF.</p>
       * <p>This tag is also used for HEIC image capture.</p>
       * <p><b>Units</b>: UTC in seconds since January 1, 1970</p>
       * <p>This key is available on all devices.</p>
       * @hide
       */
      public static final Key<Long> JPEG_GPS_TIMESTAMP =
              new Key<Long>("android.jpeg.gpsTimestamp", long.class);
  
      /**
       * <p>The orientation for a JPEG image.</p>
       * <p>The clockwise rotation angle in degrees, relative to the orientation
       * to the camera, that the JPEG picture needs to be rotated by, to be viewed
       * upright.</p>
       * <p>Camera devices may either encode this value into the JPEG EXIF header, or
       * rotate the image data to match this orientation. When the image data is rotated,
       * the thumbnail data will also be rotated.</p>
       * <p>Note that this orientation is relative to the orientation of the camera sensor, given
       * by {@link CameraCharacteristics#SENSOR_ORIENTATION android.sensor.orientation}.</p>
       * <p>To translate from the device orientation given by the Android sensor APIs for camera
       * sensors which are not EXTERNAL, the following sample code may be used:</p>
       * <pre><code>private int getJpegOrientation(CameraCharacteristics c, int deviceOrientation) {
       *     if (deviceOrientation == android.view.OrientationEventListener.ORIENTATION_UNKNOWN) return 0;
       *     int sensorOrientation = c.get(CameraCharacteristics.SENSOR_ORIENTATION);
       *
       *     // Round device orientation to a multiple of 90
       *     deviceOrientation = (deviceOrientation + 45) / 90 * 90;
       *
       *     // Reverse device orientation for front-facing cameras
       *     boolean facingFront = c.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_FRONT;
       *     if (facingFront) deviceOrientation = -deviceOrientation;
       *
       *     // Calculate desired JPEG orientation relative to camera orientation to make
       *     // the image upright relative to the device orientation
       *     int jpegOrientation = (sensorOrientation + deviceOrientation + 360) % 360;
       *
       *     return jpegOrientation;
       * }
       * </code></pre>
       * <p>For EXTERNAL cameras the sensor orientation will always be set to 0 and the facing will
       * also be set to EXTERNAL. The above code is not relevant in such case.</p>
       * <p>This tag is also used to describe the orientation of the HEIC image capture, in which
       * case the rotation is reflected by
       * {@link android.media.ExifInterface#TAG_ORIENTATION EXIF orientation flag}, and not by
       * rotating the image data itself.</p>
       * <p><b>Units</b>: Degrees in multiples of 90</p>
       * <p><b>Range of valid values:</b><br>
       * 0, 90, 180, 270</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CameraCharacteristics#SENSOR_ORIENTATION
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> JPEG_ORIENTATION =
              new Key<Integer>("android.jpeg.orientation", int.class);
  
      /**
       * <p>Compression quality of the final JPEG
       * image.</p>
       * <p>85-95 is typical usage range. This tag is also used to describe the quality
       * of the HEIC image capture.</p>
       * <p><b>Range of valid values:</b><br>
       * 1-100; larger is higher quality</p>
       * <p>This key is available on all devices.</p>
       */
      @PublicKey
      @NonNull
      public static final Key<Byte> JPEG_QUALITY =
              new Key<Byte>("android.jpeg.quality", byte.class);
  
      /**
       * <p>Compression quality of JPEG
       * thumbnail.</p>
       * <p>This tag is also used to describe the quality of the HEIC image capture.</p>
       * <p><b>Range of valid values:</b><br>
       * 1-100; larger is higher quality</p>
       * <p>This key is available on all devices.</p>
       */
      @PublicKey
      @NonNull
      public static final Key<Byte> JPEG_THUMBNAIL_QUALITY =
              new Key<Byte>("android.jpeg.thumbnailQuality", byte.class);
  
      /**
       * <p>Resolution of embedded JPEG thumbnail.</p>
       * <p>When set to (0, 0) value, the JPEG EXIF will not contain thumbnail,
       * but the captured JPEG will still be a valid image.</p>
       * <p>For best results, when issuing a request for a JPEG image, the thumbnail size selected
       * should have the same aspect ratio as the main JPEG output.</p>
       * <p>If the thumbnail image aspect ratio differs from the JPEG primary image aspect
       * ratio, the camera device creates the thumbnail by cropping it from the primary image.
       * For example, if the primary image has 4:3 aspect ratio, the thumbnail image has
       * 16:9 aspect ratio, the primary image will be cropped vertically (letterbox) to
       * generate the thumbnail image. The thumbnail image will always have a smaller Field
       * Of View (FOV) than the primary image when aspect ratios differ.</p>
       * <p>When an {@link CaptureRequest#JPEG_ORIENTATION android.jpeg.orientation} of non-zero degree is requested,
       * the camera device will handle thumbnail rotation in one of the following ways:</p>
       * <ul>
       * <li>Set the {@link android.media.ExifInterface#TAG_ORIENTATION EXIF orientation flag}
       *   and keep jpeg and thumbnail image data unrotated.</li>
       * <li>Rotate the jpeg and thumbnail image data and not set
       *   {@link android.media.ExifInterface#TAG_ORIENTATION EXIF orientation flag}. In this
       *   case, LIMITED or FULL hardware level devices will report rotated thumnail size in
       *   capture result, so the width and height will be interchanged if 90 or 270 degree
       *   orientation is requested. LEGACY device will always report unrotated thumbnail
       *   size.</li>
       * </ul>
       * <p>The tag is also used as thumbnail size for HEIC image format capture, in which case the
       * the thumbnail rotation is reflected by
       * {@link android.media.ExifInterface#TAG_ORIENTATION EXIF orientation flag}, and not by
       * rotating the thumbnail data itself.</p>
       * <p><b>Range of valid values:</b><br>
       * {@link CameraCharacteristics#JPEG_AVAILABLE_THUMBNAIL_SIZES android.jpeg.availableThumbnailSizes}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CameraCharacteristics#JPEG_AVAILABLE_THUMBNAIL_SIZES
       * @see CaptureRequest#JPEG_ORIENTATION
       */
      @PublicKey
      @NonNull
      public static final Key<android.util.Size> JPEG_THUMBNAIL_SIZE =
              new Key<android.util.Size>("android.jpeg.thumbnailSize", android.util.Size.class);
  
      /**
       * <p>The desired lens aperture size, as a ratio of lens focal length to the
       * effective aperture diameter.</p>
       * <p>Setting this value is only supported on the camera devices that have a variable
       * aperture lens.</p>
       * <p>When this is supported and {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} is OFF,
       * this can be set along with {@link CaptureRequest#SENSOR_EXPOSURE_TIME android.sensor.exposureTime},
       * {@link CaptureRequest#SENSOR_SENSITIVITY android.sensor.sensitivity}, and {@link CaptureRequest#SENSOR_FRAME_DURATION android.sensor.frameDuration}
       * to achieve manual exposure control.</p>
       * <p>The requested aperture value may take several frames to reach the
       * requested value; the camera device will report the current (intermediate)
       * aperture size in capture result metadata while the aperture is changing.
       * While the aperture is still changing, {@link CaptureResult#LENS_STATE android.lens.state} will be set to MOVING.</p>
       * <p>When this is supported and {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} is one of
       * the ON modes, this will be overridden by the camera device
       * auto-exposure algorithm, the overridden values are then provided
       * back to the user in the corresponding result.</p>
       * <p><b>Units</b>: The f-number (f/N)</p>
       * <p><b>Range of valid values:</b><br>
       * {@link CameraCharacteristics#LENS_INFO_AVAILABLE_APERTURES android.lens.info.availableApertures}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#LENS_INFO_AVAILABLE_APERTURES
       * @see CaptureResult#LENS_STATE
       * @see CaptureRequest#SENSOR_EXPOSURE_TIME
       * @see CaptureRequest#SENSOR_FRAME_DURATION
       * @see CaptureRequest#SENSOR_SENSITIVITY
       */
      @PublicKey
      @NonNull
      public static final Key<Float> LENS_APERTURE =
              new Key<Float>("android.lens.aperture", float.class);
  
      /**
       * <p>The desired setting for the lens neutral density filter(s).</p>
       * <p>This control will not be supported on most camera devices.</p>
       * <p>Lens filters are typically used to lower the amount of light the
       * sensor is exposed to (measured in steps of EV). As used here, an EV
       * step is the standard logarithmic representation, which are
       * non-negative, and inversely proportional to the amount of light
       * hitting the sensor.  For example, setting this to 0 would result
       * in no reduction of the incoming light, and setting this to 2 would
       * mean that the filter is set to reduce incoming light by two stops
       * (allowing 1/4 of the prior amount of light to the sensor).</p>
       * <p>It may take several frames before the lens filter density changes
       * to the requested value. While the filter density is still changing,
       * {@link CaptureResult#LENS_STATE android.lens.state} will be set to MOVING.</p>
       * <p><b>Units</b>: Exposure Value (EV)</p>
       * <p><b>Range of valid values:</b><br>
       * {@link CameraCharacteristics#LENS_INFO_AVAILABLE_FILTER_DENSITIES android.lens.info.availableFilterDensities}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#LENS_INFO_AVAILABLE_FILTER_DENSITIES
       * @see CaptureResult#LENS_STATE
       */
      @PublicKey
      @NonNull
      public static final Key<Float> LENS_FILTER_DENSITY =
              new Key<Float>("android.lens.filterDensity", float.class);
  
      /**
       * <p>The desired lens focal length; used for optical zoom.</p>
       * <p>This setting controls the physical focal length of the camera
       * device's lens. Changing the focal length changes the field of
       * view of the camera device, and is usually used for optical zoom.</p>
       * <p>Like {@link CaptureRequest#LENS_FOCUS_DISTANCE android.lens.focusDistance} and {@link CaptureRequest#LENS_APERTURE android.lens.aperture}, this
       * setting won't be applied instantaneously, and it may take several
       * frames before the lens can change to the requested focal length.
       * While the focal length is still changing, {@link CaptureResult#LENS_STATE android.lens.state} will
       * be set to MOVING.</p>
       * <p>Optical zoom will not be supported on most devices.</p>
       * <p><b>Units</b>: Millimeters</p>
       * <p><b>Range of valid values:</b><br>
       * {@link CameraCharacteristics#LENS_INFO_AVAILABLE_FOCAL_LENGTHS android.lens.info.availableFocalLengths}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#LENS_APERTURE
       * @see CaptureRequest#LENS_FOCUS_DISTANCE
       * @see CameraCharacteristics#LENS_INFO_AVAILABLE_FOCAL_LENGTHS
       * @see CaptureResult#LENS_STATE
       */
      @PublicKey
      @NonNull
      public static final Key<Float> LENS_FOCAL_LENGTH =
              new Key<Float>("android.lens.focalLength", float.class);
  
      /**
       * <p>Desired distance to plane of sharpest focus,
       * measured from frontmost surface of the lens.</p>
       * <p>Should be zero for fixed-focus cameras</p>
       * <p><b>Units</b>: See {@link CameraCharacteristics#LENS_INFO_FOCUS_DISTANCE_CALIBRATION android.lens.info.focusDistanceCalibration} for details</p>
       * <p><b>Range of valid values:</b><br>
       * &gt;= 0</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#LENS_INFO_FOCUS_DISTANCE_CALIBRATION
       */
      @PublicKey
      @NonNull
      public static final Key<Float> LENS_FOCUS_DISTANCE =
              new Key<Float>("android.lens.focusDistance", float.class);
  
      /**
       * <p>The range of scene distances that are in
       * sharp focus (depth of field).</p>
       * <p>If variable focus not supported, can still report
       * fixed depth of field range</p>
       * <p><b>Units</b>: A pair of focus distances in diopters: (near,
       * far); see {@link CameraCharacteristics#LENS_INFO_FOCUS_DISTANCE_CALIBRATION android.lens.info.focusDistanceCalibration} for details.</p>
       * <p><b>Range of valid values:</b><br>
       * &gt;=0</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Limited capability</b> -
       * Present on all camera devices that report being at least {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED HARDWARE_LEVEL_LIMITED} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#LENS_INFO_FOCUS_DISTANCE_CALIBRATION
       */
      @PublicKey
      @NonNull
      public static final Key<android.util.Pair<Float,Float>> LENS_FOCUS_RANGE =
              new Key<android.util.Pair<Float,Float>>("android.lens.focusRange", new TypeReference<android.util.Pair<Float,Float>>() {{ }});
  
      /**
       * <p>Sets whether the camera device uses optical image stabilization (OIS)
       * when capturing images.</p>
       * <p>OIS is used to compensate for motion blur due to small
       * movements of the camera during capture. Unlike digital image
       * stabilization ({@link CaptureRequest#CONTROL_VIDEO_STABILIZATION_MODE android.control.videoStabilizationMode}), OIS
       * makes use of mechanical elements to stabilize the camera
       * sensor, and thus allows for longer exposure times before
       * camera shake becomes apparent.</p>
       * <p>Switching between different optical stabilization modes may take several
       * frames to initialize, the camera device will report the current mode in
       * capture result metadata. For example, When "ON" mode is requested, the
       * optical stabilization modes in the first several capture results may still
       * be "OFF", and it will become "ON" when the initialization is done.</p>
       * <p>If a camera device supports both OIS and digital image stabilization
       * ({@link CaptureRequest#CONTROL_VIDEO_STABILIZATION_MODE android.control.videoStabilizationMode}), turning both modes on may produce undesirable
       * interaction, so it is recommended not to enable both at the same time.</p>
       * <p>Not all devices will support OIS; see
       * {@link CameraCharacteristics#LENS_INFO_AVAILABLE_OPTICAL_STABILIZATION android.lens.info.availableOpticalStabilization} for
       * available controls.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #LENS_OPTICAL_STABILIZATION_MODE_OFF OFF}</li>
       *   <li>{@link #LENS_OPTICAL_STABILIZATION_MODE_ON ON}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#LENS_INFO_AVAILABLE_OPTICAL_STABILIZATION android.lens.info.availableOpticalStabilization}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Limited capability</b> -
       * Present on all camera devices that report being at least {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED HARDWARE_LEVEL_LIMITED} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#CONTROL_VIDEO_STABILIZATION_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#LENS_INFO_AVAILABLE_OPTICAL_STABILIZATION
       * @see #LENS_OPTICAL_STABILIZATION_MODE_OFF
       * @see #LENS_OPTICAL_STABILIZATION_MODE_ON
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> LENS_OPTICAL_STABILIZATION_MODE =
              new Key<Integer>("android.lens.opticalStabilizationMode", int.class);
  
      /**
       * <p>Current lens status.</p>
       * <p>For lens parameters {@link CaptureRequest#LENS_FOCAL_LENGTH android.lens.focalLength}, {@link CaptureRequest#LENS_FOCUS_DISTANCE android.lens.focusDistance},
       * {@link CaptureRequest#LENS_FILTER_DENSITY android.lens.filterDensity} and {@link CaptureRequest#LENS_APERTURE android.lens.aperture}, when changes are requested,
       * they may take several frames to reach the requested values. This state indicates
       * the current status of the lens parameters.</p>
       * <p>When the state is STATIONARY, the lens parameters are not changing. This could be
       * either because the parameters are all fixed, or because the lens has had enough
       * time to reach the most recently-requested values.
       * If all these lens parameters are not changable for a camera device, as listed below:</p>
       * <ul>
       * <li>Fixed focus (<code>{@link CameraCharacteristics#LENS_INFO_MINIMUM_FOCUS_DISTANCE android.lens.info.minimumFocusDistance} == 0</code>), which means
       * {@link CaptureRequest#LENS_FOCUS_DISTANCE android.lens.focusDistance} parameter will always be 0.</li>
       * <li>Fixed focal length ({@link CameraCharacteristics#LENS_INFO_AVAILABLE_FOCAL_LENGTHS android.lens.info.availableFocalLengths} contains single value),
       * which means the optical zoom is not supported.</li>
       * <li>No ND filter ({@link CameraCharacteristics#LENS_INFO_AVAILABLE_FILTER_DENSITIES android.lens.info.availableFilterDensities} contains only 0).</li>
       * <li>Fixed aperture ({@link CameraCharacteristics#LENS_INFO_AVAILABLE_APERTURES android.lens.info.availableApertures} contains single value).</li>
       * </ul>
       * <p>Then this state will always be STATIONARY.</p>
       * <p>When the state is MOVING, it indicates that at least one of the lens parameters
       * is changing.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #LENS_STATE_STATIONARY STATIONARY}</li>
       *   <li>{@link #LENS_STATE_MOVING MOVING}</li>
       * </ul></p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Limited capability</b> -
       * Present on all camera devices that report being at least {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED HARDWARE_LEVEL_LIMITED} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CaptureRequest#LENS_APERTURE
       * @see CaptureRequest#LENS_FILTER_DENSITY
       * @see CaptureRequest#LENS_FOCAL_LENGTH
       * @see CaptureRequest#LENS_FOCUS_DISTANCE
       * @see CameraCharacteristics#LENS_INFO_AVAILABLE_APERTURES
       * @see CameraCharacteristics#LENS_INFO_AVAILABLE_FILTER_DENSITIES
       * @see CameraCharacteristics#LENS_INFO_AVAILABLE_FOCAL_LENGTHS
       * @see CameraCharacteristics#LENS_INFO_MINIMUM_FOCUS_DISTANCE
       * @see #LENS_STATE_STATIONARY
       * @see #LENS_STATE_MOVING
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> LENS_STATE =
              new Key<Integer>("android.lens.state", int.class);
  
      /**
       * <p>The orientation of the camera relative to the sensor
       * coordinate system.</p>
       * <p>The four coefficients that describe the quaternion
       * rotation from the Android sensor coordinate system to a
       * camera-aligned coordinate system where the X-axis is
       * aligned with the long side of the image sensor, the Y-axis
       * is aligned with the short side of the image sensor, and
       * the Z-axis is aligned with the optical axis of the sensor.</p>
       * <p>To convert from the quaternion coefficients <code>(x,y,z,w)</code>
       * to the axis of rotation <code>(a_x, a_y, a_z)</code> and rotation
       * amount <code>theta</code>, the following formulas can be used:</p>
       * <pre><code> theta = 2 * acos(w)
       * a_x = x / sin(theta/2)
       * a_y = y / sin(theta/2)
       * a_z = z / sin(theta/2)
       * </code></pre>
       * <p>To create a 3x3 rotation matrix that applies the rotation
       * defined by this quaternion, the following matrix can be
       * used:</p>
       * <pre><code>R = [ 1 - 2y^2 - 2z^2,       2xy - 2zw,       2xz + 2yw,
       *            2xy + 2zw, 1 - 2x^2 - 2z^2,       2yz - 2xw,
       *            2xz - 2yw,       2yz + 2xw, 1 - 2x^2 - 2y^2 ]
       * </code></pre>
       * <p>This matrix can then be used to apply the rotation to a
       *  column vector point with</p>
       * <p><code>p' = Rp</code></p>
       * <p>where <code>p</code> is in the device sensor coordinate system, and
       *  <code>p'</code> is in the camera-oriented coordinate system.</p>
       * <p><b>Units</b>:
       * Quaternion coefficients</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Permission {@link android.Manifest.permission#CAMERA } is needed to access this property</b></p>
       */
      @PublicKey
      @NonNull
      public static final Key<float[]> LENS_POSE_ROTATION =
              new Key<float[]>("android.lens.poseRotation", float[].class);
  
      /**
       * <p>Position of the camera optical center.</p>
       * <p>The position of the camera device's lens optical center,
       * as a three-dimensional vector <code>(x,y,z)</code>.</p>
       * <p>Prior to Android P, or when {@link CameraCharacteristics#LENS_POSE_REFERENCE android.lens.poseReference} is PRIMARY_CAMERA, this position
       * is relative to the optical center of the largest camera device facing in the same
       * direction as this camera, in the {@link android.hardware.SensorEvent Android sensor
       * coordinate axes}. Note that only the axis definitions are shared with the sensor
       * coordinate system, but not the origin.</p>
       * <p>If this device is the largest or only camera device with a given facing, then this
       * position will be <code>(0, 0, 0)</code>; a camera device with a lens optical center located 3 cm
       * from the main sensor along the +X axis (to the right from the user's perspective) will
       * report <code>(0.03, 0, 0)</code>.  Note that this means that, for many computer vision
       * applications, the position needs to be negated to convert it to a translation from the
       * camera to the origin.</p>
       * <p>To transform a pixel coordinates between two cameras facing the same direction, first
       * the source camera {@link CameraCharacteristics#LENS_DISTORTION android.lens.distortion} must be corrected for.  Then the source
       * camera {@link CameraCharacteristics#LENS_INTRINSIC_CALIBRATION android.lens.intrinsicCalibration} needs to be applied, followed by the
       * {@link CameraCharacteristics#LENS_POSE_ROTATION android.lens.poseRotation} of the source camera, the translation of the source camera
       * relative to the destination camera, the {@link CameraCharacteristics#LENS_POSE_ROTATION android.lens.poseRotation} of the destination
       * camera, and finally the inverse of {@link CameraCharacteristics#LENS_INTRINSIC_CALIBRATION android.lens.intrinsicCalibration} of the destination
       * camera. This obtains a radial-distortion-free coordinate in the destination camera pixel
       * coordinates.</p>
       * <p>To compare this against a real image from the destination camera, the destination camera
       * image then needs to be corrected for radial distortion before comparison or sampling.</p>
       * <p>When {@link CameraCharacteristics#LENS_POSE_REFERENCE android.lens.poseReference} is GYROSCOPE, then this position is relative to
       * the center of the primary gyroscope on the device. The axis definitions are the same as
       * with PRIMARY_CAMERA.</p>
       * <p><b>Units</b>: Meters</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Permission {@link android.Manifest.permission#CAMERA } is needed to access this property</b></p>
       *
       * @see CameraCharacteristics#LENS_DISTORTION
       * @see CameraCharacteristics#LENS_INTRINSIC_CALIBRATION
       * @see CameraCharacteristics#LENS_POSE_REFERENCE
       * @see CameraCharacteristics#LENS_POSE_ROTATION
       */
      @PublicKey
      @NonNull
      public static final Key<float[]> LENS_POSE_TRANSLATION =
              new Key<float[]>("android.lens.poseTranslation", float[].class);
  
      /**
       * <p>The parameters for this camera device's intrinsic
       * calibration.</p>
       * <p>The five calibration parameters that describe the
       * transform from camera-centric 3D coordinates to sensor
       * pixel coordinates:</p>
       * <pre><code>[f_x, f_y, c_x, c_y, s]
       * </code></pre>
       * <p>Where <code>f_x</code> and <code>f_y</code> are the horizontal and vertical
       * focal lengths, <code>[c_x, c_y]</code> is the position of the optical
       * axis, and <code>s</code> is a skew parameter for the sensor plane not
       * being aligned with the lens plane.</p>
       * <p>These are typically used within a transformation matrix K:</p>
       * <pre><code>K = [ f_x,   s, c_x,
       *        0, f_y, c_y,
       *        0    0,   1 ]
       * </code></pre>
       * <p>which can then be combined with the camera pose rotation
       * <code>R</code> and translation <code>t</code> ({@link CameraCharacteristics#LENS_POSE_ROTATION android.lens.poseRotation} and
       * {@link CameraCharacteristics#LENS_POSE_TRANSLATION android.lens.poseTranslation}, respectively) to calculate the
       * complete transform from world coordinates to pixel
       * coordinates:</p>
       * <pre><code>P = [ K 0   * [ R -Rt
       *      0 1 ]      0 1 ]
       * </code></pre>
       * <p>(Note the negation of poseTranslation when mapping from camera
       * to world coordinates, and multiplication by the rotation).</p>
       * <p>With <code>p_w</code> being a point in the world coordinate system
       * and <code>p_s</code> being a point in the camera active pixel array
       * coordinate system, and with the mapping including the
       * homogeneous division by z:</p>
       * <pre><code> p_h = (x_h, y_h, z_h) = P p_w
       * p_s = p_h / z_h
       * </code></pre>
       * <p>so <code>[x_s, y_s]</code> is the pixel coordinates of the world
       * point, <code>z_s = 1</code>, and <code>w_s</code> is a measurement of disparity
       * (depth) in pixel coordinates.</p>
       * <p>Note that the coordinate system for this transform is the
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize} system,
       * where <code>(0,0)</code> is the top-left of the
       * preCorrectionActiveArraySize rectangle. Once the pose and
       * intrinsic calibration transforms have been applied to a
       * world point, then the {@link CameraCharacteristics#LENS_DISTORTION android.lens.distortion}
       * transform needs to be applied, and the result adjusted to
       * be in the {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize} coordinate
       * system (where <code>(0, 0)</code> is the top-left of the
       * activeArraySize rectangle), to determine the final pixel
       * coordinate of the world point for processed (non-RAW)
       * output buffers.</p>
       * <p>For camera devices, the center of pixel <code>(x,y)</code> is located at
       * coordinate <code>(x + 0.5, y + 0.5)</code>.  So on a device with a
       * precorrection active array of size <code>(10,10)</code>, the valid pixel
       * indices go from <code>(0,0)-(9,9)</code>, and an perfectly-built camera would
       * have an optical center at the exact center of the pixel grid, at
       * coordinates <code>(5.0, 5.0)</code>, which is the top-left corner of pixel
       * <code>(5,5)</code>.</p>
       * <p><b>Units</b>:
       * Pixels in the
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}
       * coordinate system.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Permission {@link android.Manifest.permission#CAMERA } is needed to access this property</b></p>
       *
       * @see CameraCharacteristics#LENS_DISTORTION
       * @see CameraCharacteristics#LENS_POSE_ROTATION
       * @see CameraCharacteristics#LENS_POSE_TRANSLATION
       * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
       * @see CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
       */
      @PublicKey
      @NonNull
      public static final Key<float[]> LENS_INTRINSIC_CALIBRATION =
              new Key<float[]>("android.lens.intrinsicCalibration", float[].class);
  
      /**
       * <p>The correction coefficients to correct for this camera device's
       * radial and tangential lens distortion.</p>
       * <p>Four radial distortion coefficients <code>[kappa_0, kappa_1, kappa_2,
       * kappa_3]</code> and two tangential distortion coefficients
       * <code>[kappa_4, kappa_5]</code> that can be used to correct the
       * lens's geometric distortion with the mapping equations:</p>
       * <pre><code> x_c = x_i * ( kappa_0 + kappa_1 * r^2 + kappa_2 * r^4 + kappa_3 * r^6 ) +
       *        kappa_4 * (2 * x_i * y_i) + kappa_5 * ( r^2 + 2 * x_i^2 )
       *  y_c = y_i * ( kappa_0 + kappa_1 * r^2 + kappa_2 * r^4 + kappa_3 * r^6 ) +
       *        kappa_5 * (2 * x_i * y_i) + kappa_4 * ( r^2 + 2 * y_i^2 )
       * </code></pre>
       * <p>Here, <code>[x_c, y_c]</code> are the coordinates to sample in the
       * input image that correspond to the pixel values in the
       * corrected image at the coordinate <code>[x_i, y_i]</code>:</p>
       * <pre><code> correctedImage(x_i, y_i) = sample_at(x_c, y_c, inputImage)
       * </code></pre>
       * <p>The pixel coordinates are defined in a normalized
       * coordinate system related to the
       * {@link CameraCharacteristics#LENS_INTRINSIC_CALIBRATION android.lens.intrinsicCalibration} calibration fields.
       * Both <code>[x_i, y_i]</code> and <code>[x_c, y_c]</code> have <code>(0,0)</code> at the
       * lens optical center <code>[c_x, c_y]</code>. The maximum magnitudes
       * of both x and y coordinates are normalized to be 1 at the
       * edge further from the optical center, so the range
       * for both dimensions is <code>-1 &lt;= x &lt;= 1</code>.</p>
       * <p>Finally, <code>r</code> represents the radial distance from the
       * optical center, <code>r^2 = x_i^2 + y_i^2</code>, and its magnitude
       * is therefore no larger than <code>|r| &lt;= sqrt(2)</code>.</p>
       * <p>The distortion model used is the Brown-Conrady model.</p>
       * <p><b>Units</b>:
       * Unitless coefficients.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Permission {@link android.Manifest.permission#CAMERA } is needed to access this property</b></p>
       *
       * @see CameraCharacteristics#LENS_INTRINSIC_CALIBRATION
       * @deprecated
       * <p>This field was inconsistently defined in terms of its
       * normalization. Use {@link CameraCharacteristics#LENS_DISTORTION android.lens.distortion} instead.</p>
       *
       * @see CameraCharacteristics#LENS_DISTORTION
  
       */
      @Deprecated
      @PublicKey
      @NonNull
      public static final Key<float[]> LENS_RADIAL_DISTORTION =
              new Key<float[]>("android.lens.radialDistortion", float[].class);
  
      /**
       * <p>The correction coefficients to correct for this camera device's
       * radial and tangential lens distortion.</p>
       * <p>Replaces the deprecated {@link CameraCharacteristics#LENS_RADIAL_DISTORTION android.lens.radialDistortion} field, which was
       * inconsistently defined.</p>
       * <p>Three radial distortion coefficients <code>[kappa_1, kappa_2,
       * kappa_3]</code> and two tangential distortion coefficients
       * <code>[kappa_4, kappa_5]</code> that can be used to correct the
       * lens's geometric distortion with the mapping equations:</p>
       * <pre><code> x_c = x_i * ( 1 + kappa_1 * r^2 + kappa_2 * r^4 + kappa_3 * r^6 ) +
       *        kappa_4 * (2 * x_i * y_i) + kappa_5 * ( r^2 + 2 * x_i^2 )
       *  y_c = y_i * ( 1 + kappa_1 * r^2 + kappa_2 * r^4 + kappa_3 * r^6 ) +
       *        kappa_5 * (2 * x_i * y_i) + kappa_4 * ( r^2 + 2 * y_i^2 )
       * </code></pre>
       * <p>Here, <code>[x_c, y_c]</code> are the coordinates to sample in the
       * input image that correspond to the pixel values in the
       * corrected image at the coordinate <code>[x_i, y_i]</code>:</p>
       * <pre><code> correctedImage(x_i, y_i) = sample_at(x_c, y_c, inputImage)
       * </code></pre>
       * <p>The pixel coordinates are defined in a coordinate system
       * related to the {@link CameraCharacteristics#LENS_INTRINSIC_CALIBRATION android.lens.intrinsicCalibration}
       * calibration fields; see that entry for details of the mapping stages.
       * Both <code>[x_i, y_i]</code> and <code>[x_c, y_c]</code>
       * have <code>(0,0)</code> at the lens optical center <code>[c_x, c_y]</code>, and
       * the range of the coordinates depends on the focal length
       * terms of the intrinsic calibration.</p>
       * <p>Finally, <code>r</code> represents the radial distance from the
       * optical center, <code>r^2 = x_i^2 + y_i^2</code>.</p>
       * <p>The distortion model used is the Brown-Conrady model.</p>
       * <p><b>Units</b>:
       * Unitless coefficients.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Permission {@link android.Manifest.permission#CAMERA } is needed to access this property</b></p>
       *
       * @see CameraCharacteristics#LENS_INTRINSIC_CALIBRATION
       * @see CameraCharacteristics#LENS_RADIAL_DISTORTION
       */
      @PublicKey
      @NonNull
      public static final Key<float[]> LENS_DISTORTION =
              new Key<float[]>("android.lens.distortion", float[].class);
  
      /**
       * <p>Mode of operation for the noise reduction algorithm.</p>
       * <p>The noise reduction algorithm attempts to improve image quality by removing
       * excessive noise added by the capture process, especially in dark conditions.</p>
       * <p>OFF means no noise reduction will be applied by the camera device, for both raw and
       * YUV domain.</p>
       * <p>MINIMAL means that only sensor raw domain basic noise reduction is enabled ,to remove
       * demosaicing or other processing artifacts. For YUV_REPROCESSING, MINIMAL is same as OFF.
       * This mode is optional, may not be support by all devices. The application should check
       * {@link CameraCharacteristics#NOISE_REDUCTION_AVAILABLE_NOISE_REDUCTION_MODES android.noiseReduction.availableNoiseReductionModes} before using it.</p>
       * <p>FAST/HIGH_QUALITY both mean camera device determined noise filtering
       * will be applied. HIGH_QUALITY mode indicates that the camera device
       * will use the highest-quality noise filtering algorithms,
       * even if it slows down capture rate. FAST means the camera device will not
       * slow down capture rate when applying noise filtering. FAST may be the same as MINIMAL if
       * MINIMAL is listed, or the same as OFF if any noise filtering will slow down capture rate.
       * Every output stream will have a similar amount of enhancement applied.</p>
       * <p>ZERO_SHUTTER_LAG is meant to be used by applications that maintain a continuous circular
       * buffer of high-resolution images during preview and reprocess image(s) from that buffer
       * into a final capture when triggered by the user. In this mode, the camera device applies
       * noise reduction to low-resolution streams (below maximum recording resolution) to maximize
       * preview quality, but does not apply noise reduction to high-resolution streams, since
       * those will be reprocessed later if necessary.</p>
       * <p>For YUV_REPROCESSING, these FAST/HIGH_QUALITY modes both mean that the camera device
       * will apply FAST/HIGH_QUALITY YUV domain noise reduction, respectively. The camera device
       * may adjust the noise reduction parameters for best image quality based on the
       * {@link CaptureRequest#REPROCESS_EFFECTIVE_EXPOSURE_FACTOR android.reprocess.effectiveExposureFactor} if it is set.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #NOISE_REDUCTION_MODE_OFF OFF}</li>
       *   <li>{@link #NOISE_REDUCTION_MODE_FAST FAST}</li>
       *   <li>{@link #NOISE_REDUCTION_MODE_HIGH_QUALITY HIGH_QUALITY}</li>
       *   <li>{@link #NOISE_REDUCTION_MODE_MINIMAL MINIMAL}</li>
       *   <li>{@link #NOISE_REDUCTION_MODE_ZERO_SHUTTER_LAG ZERO_SHUTTER_LAG}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#NOISE_REDUCTION_AVAILABLE_NOISE_REDUCTION_MODES android.noiseReduction.availableNoiseReductionModes}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#NOISE_REDUCTION_AVAILABLE_NOISE_REDUCTION_MODES
       * @see CaptureRequest#REPROCESS_EFFECTIVE_EXPOSURE_FACTOR
       * @see #NOISE_REDUCTION_MODE_OFF
       * @see #NOISE_REDUCTION_MODE_FAST
       * @see #NOISE_REDUCTION_MODE_HIGH_QUALITY
       * @see #NOISE_REDUCTION_MODE_MINIMAL
       * @see #NOISE_REDUCTION_MODE_ZERO_SHUTTER_LAG
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> NOISE_REDUCTION_MODE =
              new Key<Integer>("android.noiseReduction.mode", int.class);
  
      /**
       * <p>Whether a result given to the framework is the
       * final one for the capture, or only a partial that contains a
       * subset of the full set of dynamic metadata
       * values.</p>
       * <p>The entries in the result metadata buffers for a
       * single capture may not overlap, except for this entry. The
       * FINAL buffers must retain FIFO ordering relative to the
       * requests that generate them, so the FINAL buffer for frame 3 must
       * always be sent to the framework after the FINAL buffer for frame 2, and
       * before the FINAL buffer for frame 4. PARTIAL buffers may be returned
       * in any order relative to other frames, but all PARTIAL buffers for a given
       * capture must arrive before the FINAL buffer for that capture. This entry may
       * only be used by the camera device if quirks.usePartialResult is set to 1.</p>
       * <p><b>Range of valid values:</b><br>
       * Optional. Default value is FINAL.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * @deprecated
       * <p>Not used in HALv3 or newer</p>
  
       * @hide
       */
      @Deprecated
      public static final Key<Boolean> QUIRKS_PARTIAL_RESULT =
              new Key<Boolean>("android.quirks.partialResult", boolean.class);
  
      /**
       * <p>A frame counter set by the framework. This value monotonically
       * increases with every new result (that is, each new result has a unique
       * frameCount value).</p>
       * <p>Reset on release()</p>
       * <p><b>Units</b>: count of frames</p>
       * <p><b>Range of valid values:</b><br>
       * &gt; 0</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * @deprecated
       * <p>Not used in HALv3 or newer</p>
  
       * @hide
       */
      @Deprecated
      public static final Key<Integer> REQUEST_FRAME_COUNT =
              new Key<Integer>("android.request.frameCount", int.class);
  
      /**
       * <p>An application-specified ID for the current
       * request. Must be maintained unchanged in output
       * frame</p>
       * <p><b>Units</b>: arbitrary integer assigned by application</p>
       * <p><b>Range of valid values:</b><br>
       * Any int</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * @hide
       */
      public static final Key<Integer> REQUEST_ID =
              new Key<Integer>("android.request.id", int.class);
  
      /**
       * <p>Specifies the number of pipeline stages the frame went
       * through from when it was exposed to when the final completed result
       * was available to the framework.</p>
       * <p>Depending on what settings are used in the request, and
       * what streams are configured, the data may undergo less processing,
       * and some pipeline stages skipped.</p>
       * <p>See {@link CameraCharacteristics#REQUEST_PIPELINE_MAX_DEPTH android.request.pipelineMaxDepth} for more details.</p>
       * <p><b>Range of valid values:</b><br>
       * &lt;= {@link CameraCharacteristics#REQUEST_PIPELINE_MAX_DEPTH android.request.pipelineMaxDepth}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CameraCharacteristics#REQUEST_PIPELINE_MAX_DEPTH
       */
      @PublicKey
      @NonNull
      public static final Key<Byte> REQUEST_PIPELINE_DEPTH =
              new Key<Byte>("android.request.pipelineDepth", byte.class);
  
      /**
       * <p>The desired region of the sensor to read out for this capture.</p>
       * <p>This control can be used to implement digital zoom.</p>
       * <p>For devices not supporting {@link CaptureRequest#DISTORTION_CORRECTION_MODE android.distortionCorrection.mode} control, the coordinate
       * system always follows that of {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, with <code>(0, 0)</code> being
       * the top-left pixel of the active array.</p>
       * <p>For devices supporting {@link CaptureRequest#DISTORTION_CORRECTION_MODE android.distortionCorrection.mode} control, the coordinate
       * system depends on the mode being set.
       * When the distortion correction mode is OFF, the coordinate system follows
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}, with
       * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array.
       * When the distortion correction mode is not OFF, the coordinate system follows
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, with
       * <code>(0, 0)</code> being the top-left pixel of the active array.</p>
       * <p>Output streams use this rectangle to produce their output,
       * cropping to a smaller region if necessary to maintain the
       * stream's aspect ratio, then scaling the sensor input to
       * match the output's configured resolution.</p>
       * <p>The crop region is applied after the RAW to other color
       * space (e.g. YUV) conversion. Since raw streams
       * (e.g. RAW16) don't have the conversion stage, they are not
       * croppable. The crop region will be ignored by raw streams.</p>
       * <p>For non-raw streams, any additional per-stream cropping will
       * be done to maximize the final pixel area of the stream.</p>
       * <p>For example, if the crop region is set to a 4:3 aspect
       * ratio, then 4:3 streams will use the exact crop
       * region. 16:9 streams will further crop vertically
       * (letterbox).</p>
       * <p>Conversely, if the crop region is set to a 16:9, then 4:3
       * outputs will crop horizontally (pillarbox), and 16:9
       * streams will match exactly. These additional crops will
       * be centered within the crop region.</p>
       * <p>If the coordinate system is {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, the width and height
       * of the crop region cannot be set to be smaller than
       * <code>floor( activeArraySize.width / {@link CameraCharacteristics#SCALER_AVAILABLE_MAX_DIGITAL_ZOOM android.scaler.availableMaxDigitalZoom} )</code> and
       * <code>floor( activeArraySize.height / {@link CameraCharacteristics#SCALER_AVAILABLE_MAX_DIGITAL_ZOOM android.scaler.availableMaxDigitalZoom} )</code>, respectively.</p>
       * <p>If the coordinate system is {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}, the width
       * and height of the crop region cannot be set to be smaller than
       * <code>floor( preCorrectionActiveArraySize.width / {@link CameraCharacteristics#SCALER_AVAILABLE_MAX_DIGITAL_ZOOM android.scaler.availableMaxDigitalZoom} )</code>
       * and
       * <code>floor( preCorrectionActiveArraySize.height / {@link CameraCharacteristics#SCALER_AVAILABLE_MAX_DIGITAL_ZOOM android.scaler.availableMaxDigitalZoom} )</code>,
       * respectively.</p>
       * <p>The camera device may adjust the crop region to account
       * for rounding and other hardware requirements; the final
       * crop region used will be included in the output capture
       * result.</p>
       * <p><b>Units</b>: Pixel coordinates relative to
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize} or
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize} depending on distortion correction
       * capability and mode</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#DISTORTION_CORRECTION_MODE
       * @see CameraCharacteristics#SCALER_AVAILABLE_MAX_DIGITAL_ZOOM
       * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
       * @see CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
       */
      @PublicKey
      @NonNull
      public static final Key<android.graphics.Rect> SCALER_CROP_REGION =
              new Key<android.graphics.Rect>("android.scaler.cropRegion", android.graphics.Rect.class);
  
      /**
       * <p>Duration each pixel is exposed to
       * light.</p>
       * <p>If the sensor can't expose this exact duration, it will shorten the
       * duration exposed to the nearest possible value (rather than expose longer).
       * The final exposure time used will be available in the output capture result.</p>
       * <p>This control is only effective if {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} or {@link CaptureRequest#CONTROL_MODE android.control.mode} is set to
       * OFF; otherwise the auto-exposure algorithm will override this value.</p>
       * <p><b>Units</b>: Nanoseconds</p>
       * <p><b>Range of valid values:</b><br>
       * {@link CameraCharacteristics#SENSOR_INFO_EXPOSURE_TIME_RANGE android.sensor.info.exposureTimeRange}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CaptureRequest#CONTROL_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#SENSOR_INFO_EXPOSURE_TIME_RANGE
       */
      @PublicKey
      @NonNull
      public static final Key<Long> SENSOR_EXPOSURE_TIME =
              new Key<Long>("android.sensor.exposureTime", long.class);
  
      /**
       * <p>Duration from start of frame exposure to
       * start of next frame exposure.</p>
       * <p>The maximum frame rate that can be supported by a camera subsystem is
       * a function of many factors:</p>
       * <ul>
       * <li>Requested resolutions of output image streams</li>
       * <li>Availability of binning / skipping modes on the imager</li>
       * <li>The bandwidth of the imager interface</li>
       * <li>The bandwidth of the various ISP processing blocks</li>
       * </ul>
       * <p>Since these factors can vary greatly between different ISPs and
       * sensors, the camera abstraction tries to represent the bandwidth
       * restrictions with as simple a model as possible.</p>
       * <p>The model presented has the following characteristics:</p>
       * <ul>
       * <li>The image sensor is always configured to output the smallest
       * resolution possible given the application's requested output stream
       * sizes.  The smallest resolution is defined as being at least as large
       * as the largest requested output stream size; the camera pipeline must
       * never digitally upsample sensor data when the crop region covers the
       * whole sensor. In general, this means that if only small output stream
       * resolutions are configured, the sensor can provide a higher frame
       * rate.</li>
       * <li>Since any request may use any or all the currently configured
       * output streams, the sensor and ISP must be configured to support
       * scaling a single capture to all the streams at the same time.  This
       * means the camera pipeline must be ready to produce the largest
       * requested output size without any delay.  Therefore, the overall
       * frame rate of a given configured stream set is governed only by the
       * largest requested stream resolution.</li>
       * <li>Using more than one output stream in a request does not affect the
       * frame duration.</li>
       * <li>Certain format-streams may need to do additional background processing
       * before data is consumed/produced by that stream. These processors
       * can run concurrently to the rest of the camera pipeline, but
       * cannot process more than 1 capture at a time.</li>
       * </ul>
       * <p>The necessary information for the application, given the model above, is provided via
       * {@link android.hardware.camera2.params.StreamConfigurationMap#getOutputMinFrameDuration }.
       * These are used to determine the maximum frame rate / minimum frame duration that is
       * possible for a given stream configuration.</p>
       * <p>Specifically, the application can use the following rules to
       * determine the minimum frame duration it can request from the camera
       * device:</p>
       * <ol>
       * <li>Let the set of currently configured input/output streams be called <code>S</code>.</li>
       * <li>Find the minimum frame durations for each stream in <code>S</code>, by looking it up in {@link android.hardware.camera2.params.StreamConfigurationMap#getOutputMinFrameDuration }
       * (with its respective size/format). Let this set of frame durations be called <code>F</code>.</li>
       * <li>For any given request <code>R</code>, the minimum frame duration allowed for <code>R</code> is the maximum
       * out of all values in <code>F</code>. Let the streams used in <code>R</code> be called <code>S_r</code>.</li>
       * </ol>
       * <p>If none of the streams in <code>S_r</code> have a stall time (listed in {@link android.hardware.camera2.params.StreamConfigurationMap#getOutputStallDuration }
       * using its respective size/format), then the frame duration in <code>F</code> determines the steady
       * state frame rate that the application will get if it uses <code>R</code> as a repeating request. Let
       * this special kind of request be called <code>Rsimple</code>.</p>
       * <p>A repeating request <code>Rsimple</code> can be <em>occasionally</em> interleaved by a single capture of a
       * new request <code>Rstall</code> (which has at least one in-use stream with a non-0 stall time) and if
       * <code>Rstall</code> has the same minimum frame duration this will not cause a frame rate loss if all
       * buffers from the previous <code>Rstall</code> have already been delivered.</p>
       * <p>For more details about stalling, see {@link android.hardware.camera2.params.StreamConfigurationMap#getOutputStallDuration }.</p>
       * <p>This control is only effective if {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} or {@link CaptureRequest#CONTROL_MODE android.control.mode} is set to
       * OFF; otherwise the auto-exposure algorithm will override this value.</p>
       * <p><b>Units</b>: Nanoseconds</p>
       * <p><b>Range of valid values:</b><br>
       * See {@link CameraCharacteristics#SENSOR_INFO_MAX_FRAME_DURATION android.sensor.info.maxFrameDuration}, {@link android.hardware.camera2.params.StreamConfigurationMap }.
       * The duration is capped to <code>max(duration, exposureTime + overhead)</code>.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CaptureRequest#CONTROL_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#SENSOR_INFO_MAX_FRAME_DURATION
       */
      @PublicKey
      @NonNull
      public static final Key<Long> SENSOR_FRAME_DURATION =
              new Key<Long>("android.sensor.frameDuration", long.class);
  
      /**
       * <p>The amount of gain applied to sensor data
       * before processing.</p>
       * <p>The sensitivity is the standard ISO sensitivity value,
       * as defined in ISO 12232:2006.</p>
       * <p>The sensitivity must be within {@link CameraCharacteristics#SENSOR_INFO_SENSITIVITY_RANGE android.sensor.info.sensitivityRange}, and
       * if if it less than {@link CameraCharacteristics#SENSOR_MAX_ANALOG_SENSITIVITY android.sensor.maxAnalogSensitivity}, the camera device
       * is guaranteed to use only analog amplification for applying the gain.</p>
       * <p>If the camera device cannot apply the exact sensitivity
       * requested, it will reduce the gain to the nearest supported
       * value. The final sensitivity used will be available in the
       * output capture result.</p>
       * <p>This control is only effective if {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} or {@link CaptureRequest#CONTROL_MODE android.control.mode} is set to
       * OFF; otherwise the auto-exposure algorithm will override this value.</p>
       * <p><b>Units</b>: ISO arithmetic units</p>
       * <p><b>Range of valid values:</b><br>
       * {@link CameraCharacteristics#SENSOR_INFO_SENSITIVITY_RANGE android.sensor.info.sensitivityRange}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CaptureRequest#CONTROL_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#SENSOR_INFO_SENSITIVITY_RANGE
       * @see CameraCharacteristics#SENSOR_MAX_ANALOG_SENSITIVITY
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> SENSOR_SENSITIVITY =
              new Key<Integer>("android.sensor.sensitivity", int.class);
  
      /**
       * <p>Time at start of exposure of first
       * row of the image sensor active array, in nanoseconds.</p>
       * <p>The timestamps are also included in all image
       * buffers produced for the same capture, and will be identical
       * on all the outputs.</p>
       * <p>When {@link CameraCharacteristics#SENSOR_INFO_TIMESTAMP_SOURCE android.sensor.info.timestampSource} <code>==</code> UNKNOWN,
       * the timestamps measure time since an unspecified starting point,
       * and are monotonically increasing. They can be compared with the
       * timestamps for other captures from the same camera device, but are
       * not guaranteed to be comparable to any other time source.</p>
       * <p>When {@link CameraCharacteristics#SENSOR_INFO_TIMESTAMP_SOURCE android.sensor.info.timestampSource} <code>==</code> REALTIME, the
       * timestamps measure time in the same timebase as {@link android.os.SystemClock#elapsedRealtimeNanos }, and they can
       * be compared to other timestamps from other subsystems that
       * are using that base.</p>
       * <p>For reprocessing, the timestamp will match the start of exposure of
       * the input image, i.e. {@link CaptureResult#SENSOR_TIMESTAMP the
       * timestamp} in the TotalCaptureResult that was used to create the
       * reprocess capture request.</p>
       * <p><b>Units</b>: Nanoseconds</p>
       * <p><b>Range of valid values:</b><br>
       * &gt; 0</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CameraCharacteristics#SENSOR_INFO_TIMESTAMP_SOURCE
       */
      @PublicKey
      @NonNull
      public static final Key<Long> SENSOR_TIMESTAMP =
              new Key<Long>("android.sensor.timestamp", long.class);
  
      /**
       * <p>The estimated camera neutral color in the native sensor colorspace at
       * the time of capture.</p>
       * <p>This value gives the neutral color point encoded as an RGB value in the
       * native sensor color space.  The neutral color point indicates the
       * currently estimated white point of the scene illumination.  It can be
       * used to interpolate between the provided color transforms when
       * processing raw sensor data.</p>
       * <p>The order of the values is R, G, B; where R is in the lowest index.</p>
       * <p>Starting from Android Q, this key will not be present for a MONOCHROME camera, even if
       * the camera device has RAW capability.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       */
      @PublicKey
      @NonNull
      public static final Key<Rational[]> SENSOR_NEUTRAL_COLOR_POINT =
              new Key<Rational[]>("android.sensor.neutralColorPoint", Rational[].class);
  
      /**
       * <p>Noise model coefficients for each CFA mosaic channel.</p>
       * <p>This key contains two noise model coefficients for each CFA channel
       * corresponding to the sensor amplification (S) and sensor readout
       * noise (O).  These are given as pairs of coefficients for each channel
       * in the same order as channels listed for the CFA layout key
       * (see {@link CameraCharacteristics#SENSOR_INFO_COLOR_FILTER_ARRANGEMENT android.sensor.info.colorFilterArrangement}).  This is
       * represented as an array of Pair&lt;Double, Double&gt;, where
       * the first member of the Pair at index n is the S coefficient and the
       * second member is the O coefficient for the nth color channel in the CFA.</p>
       * <p>These coefficients are used in a two parameter noise model to describe
       * the amount of noise present in the image for each CFA channel.  The
       * noise model used here is:</p>
       * <p>N(x) = sqrt(Sx + O)</p>
       * <p>Where x represents the recorded signal of a CFA channel normalized to
       * the range [0, 1], and S and O are the noise model coeffiecients for
       * that channel.</p>
       * <p>A more detailed description of the noise model can be found in the
       * Adobe DNG specification for the NoiseProfile tag.</p>
       * <p>For a MONOCHROME camera, there is only one color channel. So the noise model coefficients
       * will only contain one S and one O.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CameraCharacteristics#SENSOR_INFO_COLOR_FILTER_ARRANGEMENT
       */
      @PublicKey
      @NonNull
      public static final Key<android.util.Pair<Double,Double>[]> SENSOR_NOISE_PROFILE =
              new Key<android.util.Pair<Double,Double>[]>("android.sensor.noiseProfile", new TypeReference<android.util.Pair<Double,Double>[]>() {{ }});
  
      /**
       * <p>The worst-case divergence between Bayer green channels.</p>
       * <p>This value is an estimate of the worst case split between the
       * Bayer green channels in the red and blue rows in the sensor color
       * filter array.</p>
       * <p>The green split is calculated as follows:</p>
       * <ol>
       * <li>A 5x5 pixel (or larger) window W within the active sensor array is
       * chosen. The term 'pixel' here is taken to mean a group of 4 Bayer
       * mosaic channels (R, Gr, Gb, B).  The location and size of the window
       * chosen is implementation defined, and should be chosen to provide a
       * green split estimate that is both representative of the entire image
       * for this camera sensor, and can be calculated quickly.</li>
       * <li>The arithmetic mean of the green channels from the red
       * rows (mean_Gr) within W is computed.</li>
       * <li>The arithmetic mean of the green channels from the blue
       * rows (mean_Gb) within W is computed.</li>
       * <li>The maximum ratio R of the two means is computed as follows:
       * <code>R = max((mean_Gr + 1)/(mean_Gb + 1), (mean_Gb + 1)/(mean_Gr + 1))</code></li>
       * </ol>
       * <p>The ratio R is the green split divergence reported for this property,
       * which represents how much the green channels differ in the mosaic
       * pattern.  This value is typically used to determine the treatment of
       * the green mosaic channels when demosaicing.</p>
       * <p>The green split value can be roughly interpreted as follows:</p>
       * <ul>
       * <li>R &lt; 1.03 is a negligible split (&lt;3% divergence).</li>
       * <li>1.20 &lt;= R &gt;= 1.03 will require some software
       * correction to avoid demosaic errors (3-20% divergence).</li>
       * <li>R &gt; 1.20 will require strong software correction to produce
       * a usuable image (&gt;20% divergence).</li>
       * </ul>
       * <p>Starting from Android Q, this key will not be present for a MONOCHROME camera, even if
       * the camera device has RAW capability.</p>
       * <p><b>Range of valid values:</b><br></p>
       * <p>&gt;= 0</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       */
      @PublicKey
      @NonNull
      public static final Key<Float> SENSOR_GREEN_SPLIT =
              new Key<Float>("android.sensor.greenSplit", float.class);
  
      /**
       * <p>A pixel <code>[R, G_even, G_odd, B]</code> that supplies the test pattern
       * when {@link CaptureRequest#SENSOR_TEST_PATTERN_MODE android.sensor.testPatternMode} is SOLID_COLOR.</p>
       * <p>Each color channel is treated as an unsigned 32-bit integer.
       * The camera device then uses the most significant X bits
       * that correspond to how many bits are in its Bayer raw sensor
       * output.</p>
       * <p>For example, a sensor with RAW10 Bayer output would use the
       * 10 most significant bits from each color channel.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CaptureRequest#SENSOR_TEST_PATTERN_MODE
       */
      @PublicKey
      @NonNull
      public static final Key<int[]> SENSOR_TEST_PATTERN_DATA =
              new Key<int[]>("android.sensor.testPatternData", int[].class);
  
      /**
       * <p>When enabled, the sensor sends a test pattern instead of
       * doing a real exposure from the camera.</p>
       * <p>When a test pattern is enabled, all manual sensor controls specified
       * by android.sensor.* will be ignored. All other controls should
       * work as normal.</p>
       * <p>For example, if manual flash is enabled, flash firing should still
       * occur (and that the test pattern remain unmodified, since the flash
       * would not actually affect it).</p>
       * <p>Defaults to OFF.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #SENSOR_TEST_PATTERN_MODE_OFF OFF}</li>
       *   <li>{@link #SENSOR_TEST_PATTERN_MODE_SOLID_COLOR SOLID_COLOR}</li>
       *   <li>{@link #SENSOR_TEST_PATTERN_MODE_COLOR_BARS COLOR_BARS}</li>
       *   <li>{@link #SENSOR_TEST_PATTERN_MODE_COLOR_BARS_FADE_TO_GRAY COLOR_BARS_FADE_TO_GRAY}</li>
       *   <li>{@link #SENSOR_TEST_PATTERN_MODE_PN9 PN9}</li>
       *   <li>{@link #SENSOR_TEST_PATTERN_MODE_CUSTOM1 CUSTOM1}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#SENSOR_AVAILABLE_TEST_PATTERN_MODES android.sensor.availableTestPatternModes}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CameraCharacteristics#SENSOR_AVAILABLE_TEST_PATTERN_MODES
       * @see #SENSOR_TEST_PATTERN_MODE_OFF
       * @see #SENSOR_TEST_PATTERN_MODE_SOLID_COLOR
       * @see #SENSOR_TEST_PATTERN_MODE_COLOR_BARS
       * @see #SENSOR_TEST_PATTERN_MODE_COLOR_BARS_FADE_TO_GRAY
       * @see #SENSOR_TEST_PATTERN_MODE_PN9
       * @see #SENSOR_TEST_PATTERN_MODE_CUSTOM1
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> SENSOR_TEST_PATTERN_MODE =
              new Key<Integer>("android.sensor.testPatternMode", int.class);
  
      /**
       * <p>Duration between the start of first row exposure
       * and the start of last row exposure.</p>
       * <p>This is the exposure time skew between the first and last
       * row exposure start times. The first row and the last row are
       * the first and last rows inside of the
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.</p>
       * <p>For typical camera sensors that use rolling shutters, this is also equivalent
       * to the frame readout time.</p>
       * <p><b>Units</b>: Nanoseconds</p>
       * <p><b>Range of valid values:</b><br>
       * &gt;= 0 and &lt;
       * {@link android.hardware.camera2.params.StreamConfigurationMap#getOutputMinFrameDuration }.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Limited capability</b> -
       * Present on all camera devices that report being at least {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED HARDWARE_LEVEL_LIMITED} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
       */
      @PublicKey
      @NonNull
      public static final Key<Long> SENSOR_ROLLING_SHUTTER_SKEW =
              new Key<Long>("android.sensor.rollingShutterSkew", long.class);
  
      /**
       * <p>A per-frame dynamic black level offset for each of the color filter
       * arrangement (CFA) mosaic channels.</p>
       * <p>Camera sensor black levels may vary dramatically for different
       * capture settings (e.g. {@link CaptureRequest#SENSOR_SENSITIVITY android.sensor.sensitivity}). The fixed black
       * level reported by {@link CameraCharacteristics#SENSOR_BLACK_LEVEL_PATTERN android.sensor.blackLevelPattern} may be too
       * inaccurate to represent the actual value on a per-frame basis. The
       * camera device internal pipeline relies on reliable black level values
       * to process the raw images appropriately. To get the best image
       * quality, the camera device may choose to estimate the per frame black
       * level values either based on optically shielded black regions
       * ({@link CameraCharacteristics#SENSOR_OPTICAL_BLACK_REGIONS android.sensor.opticalBlackRegions}) or its internal model.</p>
       * <p>This key reports the camera device estimated per-frame zero light
       * value for each of the CFA mosaic channels in the camera sensor. The
       * {@link CameraCharacteristics#SENSOR_BLACK_LEVEL_PATTERN android.sensor.blackLevelPattern} may only represent a coarse
       * approximation of the actual black level values. This value is the
       * black level used in camera device internal image processing pipeline
       * and generally more accurate than the fixed black level values.
       * However, since they are estimated values by the camera device, they
       * may not be as accurate as the black level values calculated from the
       * optical black pixels reported by {@link CameraCharacteristics#SENSOR_OPTICAL_BLACK_REGIONS android.sensor.opticalBlackRegions}.</p>
       * <p>The values are given in the same order as channels listed for the CFA
       * layout key (see {@link CameraCharacteristics#SENSOR_INFO_COLOR_FILTER_ARRANGEMENT android.sensor.info.colorFilterArrangement}), i.e. the
       * nth value given corresponds to the black level offset for the nth
       * color channel listed in the CFA.</p>
       * <p>For a MONOCHROME camera, all of the 2x2 channels must have the same values.</p>
       * <p>This key will be available if {@link CameraCharacteristics#SENSOR_OPTICAL_BLACK_REGIONS android.sensor.opticalBlackRegions} is available or the
       * camera device advertises this key via {@link android.hardware.camera2.CameraCharacteristics#getAvailableCaptureResultKeys }.</p>
       * <p><b>Range of valid values:</b><br>
       * &gt;= 0 for each.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CameraCharacteristics#SENSOR_BLACK_LEVEL_PATTERN
       * @see CameraCharacteristics#SENSOR_INFO_COLOR_FILTER_ARRANGEMENT
       * @see CameraCharacteristics#SENSOR_OPTICAL_BLACK_REGIONS
       * @see CaptureRequest#SENSOR_SENSITIVITY
       */
      @PublicKey
      @NonNull
      public static final Key<float[]> SENSOR_DYNAMIC_BLACK_LEVEL =
              new Key<float[]>("android.sensor.dynamicBlackLevel", float[].class);
  
      /**
       * <p>Maximum raw value output by sensor for this frame.</p>
       * <p>Since the {@link CameraCharacteristics#SENSOR_BLACK_LEVEL_PATTERN android.sensor.blackLevelPattern} may change for different
       * capture settings (e.g., {@link CaptureRequest#SENSOR_SENSITIVITY android.sensor.sensitivity}), the white
       * level will change accordingly. This key is similar to
       * {@link CameraCharacteristics#SENSOR_INFO_WHITE_LEVEL android.sensor.info.whiteLevel}, but specifies the camera device
       * estimated white level for each frame.</p>
       * <p>This key will be available if {@link CameraCharacteristics#SENSOR_OPTICAL_BLACK_REGIONS android.sensor.opticalBlackRegions} is
       * available or the camera device advertises this key via
       * {@link android.hardware.camera2.CameraCharacteristics#getAvailableCaptureRequestKeys }.</p>
       * <p><b>Range of valid values:</b><br>
       * &gt;= 0</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CameraCharacteristics#SENSOR_BLACK_LEVEL_PATTERN
       * @see CameraCharacteristics#SENSOR_INFO_WHITE_LEVEL
       * @see CameraCharacteristics#SENSOR_OPTICAL_BLACK_REGIONS
       * @see CaptureRequest#SENSOR_SENSITIVITY
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> SENSOR_DYNAMIC_WHITE_LEVEL =
              new Key<Integer>("android.sensor.dynamicWhiteLevel", int.class);
  
      /**
       * <p>Quality of lens shading correction applied
       * to the image data.</p>
       * <p>When set to OFF mode, no lens shading correction will be applied by the
       * camera device, and an identity lens shading map data will be provided
       * if <code>{@link CaptureRequest#STATISTICS_LENS_SHADING_MAP_MODE android.statistics.lensShadingMapMode} == ON</code>. For example, for lens
       * shading map with size of <code>[ 4, 3 ]</code>,
       * the output {@link CaptureResult#STATISTICS_LENS_SHADING_CORRECTION_MAP android.statistics.lensShadingCorrectionMap} for this case will be an identity
       * map shown below:</p>
       * <pre><code>[ 1.0, 1.0, 1.0, 1.0,  1.0, 1.0, 1.0, 1.0,
       *  1.0, 1.0, 1.0, 1.0,  1.0, 1.0, 1.0, 1.0,
       *  1.0, 1.0, 1.0, 1.0,  1.0, 1.0, 1.0, 1.0,
       *  1.0, 1.0, 1.0, 1.0,  1.0, 1.0, 1.0, 1.0,
       *  1.0, 1.0, 1.0, 1.0,  1.0, 1.0, 1.0, 1.0,
       *  1.0, 1.0, 1.0, 1.0,  1.0, 1.0, 1.0, 1.0 ]
       * </code></pre>
       * <p>When set to other modes, lens shading correction will be applied by the camera
       * device. Applications can request lens shading map data by setting
       * {@link CaptureRequest#STATISTICS_LENS_SHADING_MAP_MODE android.statistics.lensShadingMapMode} to ON, and then the camera device will provide lens
       * shading map data in {@link CaptureResult#STATISTICS_LENS_SHADING_CORRECTION_MAP android.statistics.lensShadingCorrectionMap}; the returned shading map
       * data will be the one applied by the camera device for this capture request.</p>
       * <p>The shading map data may depend on the auto-exposure (AE) and AWB statistics, therefore
       * the reliability of the map data may be affected by the AE and AWB algorithms. When AE and
       * AWB are in AUTO modes({@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} <code>!=</code> OFF and {@link CaptureRequest#CONTROL_AWB_MODE android.control.awbMode} <code>!=</code>
       * OFF), to get best results, it is recommended that the applications wait for the AE and AWB
       * to be converged before using the returned shading map data.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #SHADING_MODE_OFF OFF}</li>
       *   <li>{@link #SHADING_MODE_FAST FAST}</li>
       *   <li>{@link #SHADING_MODE_HIGH_QUALITY HIGH_QUALITY}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#SHADING_AVAILABLE_MODES android.shading.availableModes}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CaptureRequest#CONTROL_AWB_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#SHADING_AVAILABLE_MODES
       * @see CaptureResult#STATISTICS_LENS_SHADING_CORRECTION_MAP
       * @see CaptureRequest#STATISTICS_LENS_SHADING_MAP_MODE
       * @see #SHADING_MODE_OFF
       * @see #SHADING_MODE_FAST
       * @see #SHADING_MODE_HIGH_QUALITY
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> SHADING_MODE =
              new Key<Integer>("android.shading.mode", int.class);
  
      /**
       * <p>Operating mode for the face detector
       * unit.</p>
       * <p>Whether face detection is enabled, and whether it
       * should output just the basic fields or the full set of
       * fields.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #STATISTICS_FACE_DETECT_MODE_OFF OFF}</li>
       *   <li>{@link #STATISTICS_FACE_DETECT_MODE_SIMPLE SIMPLE}</li>
       *   <li>{@link #STATISTICS_FACE_DETECT_MODE_FULL FULL}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES android.statistics.info.availableFaceDetectModes}</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CameraCharacteristics#STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES
       * @see #STATISTICS_FACE_DETECT_MODE_OFF
       * @see #STATISTICS_FACE_DETECT_MODE_SIMPLE
       * @see #STATISTICS_FACE_DETECT_MODE_FULL
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> STATISTICS_FACE_DETECT_MODE =
              new Key<Integer>("android.statistics.faceDetectMode", int.class);
  
      /**
       * <p>List of unique IDs for detected faces.</p>
       * <p>Each detected face is given a unique ID that is valid for as long as the face is visible
       * to the camera device.  A face that leaves the field of view and later returns may be
       * assigned a new ID.</p>
       * <p>Only available if {@link CaptureRequest#STATISTICS_FACE_DETECT_MODE android.statistics.faceDetectMode} == FULL
       * This key is available on all devices.</p>
       *
       * @see CaptureRequest#STATISTICS_FACE_DETECT_MODE
       * @hide
       */
      public static final Key<int[]> STATISTICS_FACE_IDS =
              new Key<int[]>("android.statistics.faceIds", int[].class);
  
      /**
       * <p>List of landmarks for detected
       * faces.</p>
       * <p>For devices not supporting {@link CaptureRequest#DISTORTION_CORRECTION_MODE android.distortionCorrection.mode} control, the coordinate
       * system always follows that of {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, with <code>(0, 0)</code> being
       * the top-left pixel of the active array.</p>
       * <p>For devices supporting {@link CaptureRequest#DISTORTION_CORRECTION_MODE android.distortionCorrection.mode} control, the coordinate
       * system depends on the mode being set.
       * When the distortion correction mode is OFF, the coordinate system follows
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}, with
       * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array.
       * When the distortion correction mode is not OFF, the coordinate system follows
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, with
       * <code>(0, 0)</code> being the top-left pixel of the active array.</p>
       * <p>Only available if {@link CaptureRequest#STATISTICS_FACE_DETECT_MODE android.statistics.faceDetectMode} == FULL
       * This key is available on all devices.</p>
       *
       * @see CaptureRequest#DISTORTION_CORRECTION_MODE
       * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
       * @see CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
       * @see CaptureRequest#STATISTICS_FACE_DETECT_MODE
       * @hide
       */
      public static final Key<int[]> STATISTICS_FACE_LANDMARKS =
              new Key<int[]>("android.statistics.faceLandmarks", int[].class);
  
      /**
       * <p>List of the bounding rectangles for detected
       * faces.</p>
       * <p>For devices not supporting {@link CaptureRequest#DISTORTION_CORRECTION_MODE android.distortionCorrection.mode} control, the coordinate
       * system always follows that of {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, with <code>(0, 0)</code> being
       * the top-left pixel of the active array.</p>
       * <p>For devices supporting {@link CaptureRequest#DISTORTION_CORRECTION_MODE android.distortionCorrection.mode} control, the coordinate
       * system depends on the mode being set.
       * When the distortion correction mode is OFF, the coordinate system follows
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}, with
       * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array.
       * When the distortion correction mode is not OFF, the coordinate system follows
       * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}, with
       * <code>(0, 0)</code> being the top-left pixel of the active array.</p>
       * <p>Only available if {@link CaptureRequest#STATISTICS_FACE_DETECT_MODE android.statistics.faceDetectMode} != OFF
       * This key is available on all devices.</p>
       *
       * @see CaptureRequest#DISTORTION_CORRECTION_MODE
       * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
       * @see CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
       * @see CaptureRequest#STATISTICS_FACE_DETECT_MODE
       * @hide
       */
      public static final Key<android.graphics.Rect[]> STATISTICS_FACE_RECTANGLES =
              new Key<android.graphics.Rect[]>("android.statistics.faceRectangles", android.graphics.Rect[].class);
  
      /**
       * <p>List of the face confidence scores for
       * detected faces</p>
       * <p>Only available if {@link CaptureRequest#STATISTICS_FACE_DETECT_MODE android.statistics.faceDetectMode} != OFF.</p>
       * <p><b>Range of valid values:</b><br>
       * 1-100</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#STATISTICS_FACE_DETECT_MODE
       * @hide
       */
      public static final Key<byte[]> STATISTICS_FACE_SCORES =
              new Key<byte[]>("android.statistics.faceScores", byte[].class);
  
      /**
       * <p>List of the faces detected through camera face detection
       * in this capture.</p>
       * <p>Only available if {@link CaptureRequest#STATISTICS_FACE_DETECT_MODE android.statistics.faceDetectMode} <code>!=</code> OFF.</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CaptureRequest#STATISTICS_FACE_DETECT_MODE
       */
      @PublicKey
      @NonNull
      @SyntheticKey
      public static final Key<android.hardware.camera2.params.Face[]> STATISTICS_FACES =
              new Key<android.hardware.camera2.params.Face[]>("android.statistics.faces", android.hardware.camera2.params.Face[].class);
  
      /**
       * <p>The shading map is a low-resolution floating-point map
       * that lists the coefficients used to correct for vignetting, for each
       * Bayer color channel.</p>
       * <p>The map provided here is the same map that is used by the camera device to
       * correct both color shading and vignetting for output non-RAW images.</p>
       * <p>When there is no lens shading correction applied to RAW
       * output images ({@link CameraCharacteristics#SENSOR_INFO_LENS_SHADING_APPLIED android.sensor.info.lensShadingApplied} <code>==</code>
       * false), this map is the complete lens shading correction
       * map; when there is some lens shading correction applied to
       * the RAW output image ({@link CameraCharacteristics#SENSOR_INFO_LENS_SHADING_APPLIED android.sensor.info.lensShadingApplied}<code>==</code> true), this map reports the remaining lens shading
       * correction map that needs to be applied to get shading
       * corrected images that match the camera device's output for
       * non-RAW formats.</p>
       * <p>For a complete shading correction map, the least shaded
       * section of the image will have a gain factor of 1; all
       * other sections will have gains above 1.</p>
       * <p>When {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode} = TRANSFORM_MATRIX, the map
       * will take into account the colorCorrection settings.</p>
       * <p>The shading map is for the entire active pixel array, and is not
       * affected by the crop region specified in the request. Each shading map
       * entry is the value of the shading compensation map over a specific
       * pixel on the sensor.  Specifically, with a (N x M) resolution shading
       * map, and an active pixel array size (W x H), shading map entry
       * (x,y) ϵ (0 ... N-1, 0 ... M-1) is the value of the shading map at
       * pixel ( ((W-1)/(N-1)) * x, ((H-1)/(M-1)) * y) for the four color channels.
       * The map is assumed to be bilinearly interpolated between the sample points.</p>
       * <p>The channel order is [R, Geven, Godd, B], where Geven is the green
       * channel for the even rows of a Bayer pattern, and Godd is the odd rows.
       * The shading map is stored in a fully interleaved format.</p>
       * <p>The shading map will generally have on the order of 30-40 rows and columns,
       * and will be smaller than 64x64.</p>
       * <p>As an example, given a very small map defined as:</p>
       * <pre><code>width,height = [ 4, 3 ]
       * values =
       * [ 1.3, 1.2, 1.15, 1.2,  1.2, 1.2, 1.15, 1.2,
       *     1.1, 1.2, 1.2, 1.2,  1.3, 1.2, 1.3, 1.3,
       *   1.2, 1.2, 1.25, 1.1,  1.1, 1.1, 1.1, 1.0,
       *     1.0, 1.0, 1.0, 1.0,  1.2, 1.3, 1.25, 1.2,
       *   1.3, 1.2, 1.2, 1.3,   1.2, 1.15, 1.1, 1.2,
       *     1.2, 1.1, 1.0, 1.2,  1.3, 1.15, 1.2, 1.3 ]
       * </code></pre>
       * <p>The low-resolution scaling map images for each channel are
       * (displayed using nearest-neighbor interpolation):</p>
       * <p><img alt="Red lens shading map" src="/reference/images/camera2/metadata/android.statistics.lensShadingMap/red_shading.png" />
       * <img alt="Green (even rows) lens shading map" src="/reference/images/camera2/metadata/android.statistics.lensShadingMap/green_e_shading.png" />
       * <img alt="Green (odd rows) lens shading map" src="/reference/images/camera2/metadata/android.statistics.lensShadingMap/green_o_shading.png" />
       * <img alt="Blue lens shading map" src="/reference/images/camera2/metadata/android.statistics.lensShadingMap/blue_shading.png" /></p>
       * <p>As a visualization only, inverting the full-color map to recover an
       * image of a gray wall (using bicubic interpolation for visual quality) as captured by the sensor gives:</p>
       * <p><img alt="Image of a uniform white wall (inverse shading map)" src="/reference/images/camera2/metadata/android.statistics.lensShadingMap/inv_shading.png" /></p>
       * <p>For a MONOCHROME camera, all of the 2x2 channels must have the same values. An example
       * shading map for such a camera is defined as:</p>
       * <pre><code>android.lens.info.shadingMapSize = [ 4, 3 ]
       * android.statistics.lensShadingMap =
       * [ 1.3, 1.3, 1.3, 1.3,  1.2, 1.2, 1.2, 1.2,
       *     1.1, 1.1, 1.1, 1.1,  1.3, 1.3, 1.3, 1.3,
       *   1.2, 1.2, 1.2, 1.2,  1.1, 1.1, 1.1, 1.1,
       *     1.0, 1.0, 1.0, 1.0,  1.2, 1.2, 1.2, 1.2,
       *   1.3, 1.3, 1.3, 1.3,   1.2, 1.2, 1.2, 1.2,
       *     1.2, 1.2, 1.2, 1.2,  1.3, 1.3, 1.3, 1.3 ]
       * </code></pre>
       * <p><b>Range of valid values:</b><br>
       * Each gain factor is &gt;= 1</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#COLOR_CORRECTION_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#SENSOR_INFO_LENS_SHADING_APPLIED
       */
      @PublicKey
      @NonNull
      public static final Key<android.hardware.camera2.params.LensShadingMap> STATISTICS_LENS_SHADING_CORRECTION_MAP =
              new Key<android.hardware.camera2.params.LensShadingMap>("android.statistics.lensShadingCorrectionMap", android.hardware.camera2.params.LensShadingMap.class);
  
      /**
       * <p>The shading map is a low-resolution floating-point map
       * that lists the coefficients used to correct for vignetting and color shading,
       * for each Bayer color channel of RAW image data.</p>
       * <p>The map provided here is the same map that is used by the camera device to
       * correct both color shading and vignetting for output non-RAW images.</p>
       * <p>When there is no lens shading correction applied to RAW
       * output images ({@link CameraCharacteristics#SENSOR_INFO_LENS_SHADING_APPLIED android.sensor.info.lensShadingApplied} <code>==</code>
       * false), this map is the complete lens shading correction
       * map; when there is some lens shading correction applied to
       * the RAW output image ({@link CameraCharacteristics#SENSOR_INFO_LENS_SHADING_APPLIED android.sensor.info.lensShadingApplied}<code>==</code> true), this map reports the remaining lens shading
       * correction map that needs to be applied to get shading
       * corrected images that match the camera device's output for
       * non-RAW formats.</p>
       * <p>For a complete shading correction map, the least shaded
       * section of the image will have a gain factor of 1; all
       * other sections will have gains above 1.</p>
       * <p>When {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode} = TRANSFORM_MATRIX, the map
       * will take into account the colorCorrection settings.</p>
       * <p>The shading map is for the entire active pixel array, and is not
       * affected by the crop region specified in the request. Each shading map
       * entry is the value of the shading compensation map over a specific
       * pixel on the sensor.  Specifically, with a (N x M) resolution shading
       * map, and an active pixel array size (W x H), shading map entry
       * (x,y) ϵ (0 ... N-1, 0 ... M-1) is the value of the shading map at
       * pixel ( ((W-1)/(N-1)) * x, ((H-1)/(M-1)) * y) for the four color channels.
       * The map is assumed to be bilinearly interpolated between the sample points.</p>
       * <p>For a Bayer camera, the channel order is [R, Geven, Godd, B], where Geven is
       * the green channel for the even rows of a Bayer pattern, and Godd is the odd rows.
       * The shading map is stored in a fully interleaved format, and its size
       * is provided in the camera static metadata by android.lens.info.shadingMapSize.</p>
       * <p>The shading map will generally have on the order of 30-40 rows and columns,
       * and will be smaller than 64x64.</p>
       * <p>As an example, given a very small map for a Bayer camera defined as:</p>
       * <pre><code>android.lens.info.shadingMapSize = [ 4, 3 ]
       * android.statistics.lensShadingMap =
       * [ 1.3, 1.2, 1.15, 1.2,  1.2, 1.2, 1.15, 1.2,
       *     1.1, 1.2, 1.2, 1.2,  1.3, 1.2, 1.3, 1.3,
       *   1.2, 1.2, 1.25, 1.1,  1.1, 1.1, 1.1, 1.0,
       *     1.0, 1.0, 1.0, 1.0,  1.2, 1.3, 1.25, 1.2,
       *   1.3, 1.2, 1.2, 1.3,   1.2, 1.15, 1.1, 1.2,
       *     1.2, 1.1, 1.0, 1.2,  1.3, 1.15, 1.2, 1.3 ]
       * </code></pre>
       * <p>The low-resolution scaling map images for each channel are
       * (displayed using nearest-neighbor interpolation):</p>
       * <p><img alt="Red lens shading map" src="/reference/images/camera2/metadata/android.statistics.lensShadingMap/red_shading.png" />
       * <img alt="Green (even rows) lens shading map" src="/reference/images/camera2/metadata/android.statistics.lensShadingMap/green_e_shading.png" />
       * <img alt="Green (odd rows) lens shading map" src="/reference/images/camera2/metadata/android.statistics.lensShadingMap/green_o_shading.png" />
       * <img alt="Blue lens shading map" src="/reference/images/camera2/metadata/android.statistics.lensShadingMap/blue_shading.png" /></p>
       * <p>As a visualization only, inverting the full-color map to recover an
       * image of a gray wall (using bicubic interpolation for visual quality)
       * as captured by the sensor gives:</p>
       * <p><img alt="Image of a uniform white wall (inverse shading map)" src="/reference/images/camera2/metadata/android.statistics.lensShadingMap/inv_shading.png" /></p>
       * <p>For a MONOCHROME camera, all of the 2x2 channels must have the same values. An example
       * shading map for such a camera is defined as:</p>
       * <pre><code>android.lens.info.shadingMapSize = [ 4, 3 ]
       * android.statistics.lensShadingMap =
       * [ 1.3, 1.3, 1.3, 1.3,  1.2, 1.2, 1.2, 1.2,
       *     1.1, 1.1, 1.1, 1.1,  1.3, 1.3, 1.3, 1.3,
       *   1.2, 1.2, 1.2, 1.2,  1.1, 1.1, 1.1, 1.1,
       *     1.0, 1.0, 1.0, 1.0,  1.2, 1.2, 1.2, 1.2,
       *   1.3, 1.3, 1.3, 1.3,   1.2, 1.2, 1.2, 1.2,
       *     1.2, 1.2, 1.2, 1.2,  1.3, 1.3, 1.3, 1.3 ]
       * </code></pre>
       * <p>Note that the RAW image data might be subject to lens shading
       * correction not reported on this map. Query
       * {@link CameraCharacteristics#SENSOR_INFO_LENS_SHADING_APPLIED android.sensor.info.lensShadingApplied} to see if RAW image data has subject
       * to lens shading correction. If {@link CameraCharacteristics#SENSOR_INFO_LENS_SHADING_APPLIED android.sensor.info.lensShadingApplied}
       * is TRUE, the RAW image data is subject to partial or full lens shading
       * correction. In the case full lens shading correction is applied to RAW
       * images, the gain factor map reported in this key will contain all 1.0 gains.
       * In other words, the map reported in this key is the remaining lens shading
       * that needs to be applied on the RAW image to get images without lens shading
       * artifacts. See {@link CameraCharacteristics#REQUEST_MAX_NUM_OUTPUT_RAW android.request.maxNumOutputRaw} for a list of RAW image
       * formats.</p>
       * <p><b>Range of valid values:</b><br>
       * Each gain factor is &gt;= 1</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#COLOR_CORRECTION_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#REQUEST_MAX_NUM_OUTPUT_RAW
       * @see CameraCharacteristics#SENSOR_INFO_LENS_SHADING_APPLIED
       * @hide
       */
      public static final Key<float[]> STATISTICS_LENS_SHADING_MAP =
              new Key<float[]>("android.statistics.lensShadingMap", float[].class);
  
      /**
       * <p>The best-fit color channel gains calculated
       * by the camera device's statistics units for the current output frame.</p>
       * <p>This may be different than the gains used for this frame,
       * since statistics processing on data from a new frame
       * typically completes after the transform has already been
       * applied to that frame.</p>
       * <p>The 4 channel gains are defined in Bayer domain,
       * see {@link CaptureRequest#COLOR_CORRECTION_GAINS android.colorCorrection.gains} for details.</p>
       * <p>This value should always be calculated by the auto-white balance (AWB) block,
       * regardless of the android.control.* current values.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CaptureRequest#COLOR_CORRECTION_GAINS
       * @deprecated
       * <p>Never fully implemented or specified; do not use</p>
  
       * @hide
       */
      @Deprecated
      public static final Key<float[]> STATISTICS_PREDICTED_COLOR_GAINS =
              new Key<float[]>("android.statistics.predictedColorGains", float[].class);
  
      /**
       * <p>The best-fit color transform matrix estimate
       * calculated by the camera device's statistics units for the current
       * output frame.</p>
       * <p>The camera device will provide the estimate from its
       * statistics unit on the white balance transforms to use
       * for the next frame. These are the values the camera device believes
       * are the best fit for the current output frame. This may
       * be different than the transform used for this frame, since
       * statistics processing on data from a new frame typically
       * completes after the transform has already been applied to
       * that frame.</p>
       * <p>These estimates must be provided for all frames, even if
       * capture settings and color transforms are set by the application.</p>
       * <p>This value should always be calculated by the auto-white balance (AWB) block,
       * regardless of the android.control.* current values.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * @deprecated
       * <p>Never fully implemented or specified; do not use</p>
  
       * @hide
       */
      @Deprecated
      public static final Key<Rational[]> STATISTICS_PREDICTED_COLOR_TRANSFORM =
              new Key<Rational[]>("android.statistics.predictedColorTransform", Rational[].class);
  
      /**
       * <p>The camera device estimated scene illumination lighting
       * frequency.</p>
       * <p>Many light sources, such as most fluorescent lights, flicker at a rate
       * that depends on the local utility power standards. This flicker must be
       * accounted for by auto-exposure routines to avoid artifacts in captured images.
       * The camera device uses this entry to tell the application what the scene
       * illuminant frequency is.</p>
       * <p>When manual exposure control is enabled
       * (<code>{@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} == OFF</code> or <code>{@link CaptureRequest#CONTROL_MODE android.control.mode} ==
       * OFF</code>), the {@link CaptureRequest#CONTROL_AE_ANTIBANDING_MODE android.control.aeAntibandingMode} doesn't perform
       * antibanding, and the application can ensure it selects
       * exposure times that do not cause banding issues by looking
       * into this metadata field. See
       * {@link CaptureRequest#CONTROL_AE_ANTIBANDING_MODE android.control.aeAntibandingMode} for more details.</p>
       * <p>Reports NONE if there doesn't appear to be flickering illumination.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #STATISTICS_SCENE_FLICKER_NONE NONE}</li>
       *   <li>{@link #STATISTICS_SCENE_FLICKER_50HZ 50HZ}</li>
       *   <li>{@link #STATISTICS_SCENE_FLICKER_60HZ 60HZ}</li>
       * </ul></p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#CONTROL_AE_ANTIBANDING_MODE
       * @see CaptureRequest#CONTROL_AE_MODE
       * @see CaptureRequest#CONTROL_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see #STATISTICS_SCENE_FLICKER_NONE
       * @see #STATISTICS_SCENE_FLICKER_50HZ
       * @see #STATISTICS_SCENE_FLICKER_60HZ
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> STATISTICS_SCENE_FLICKER =
              new Key<Integer>("android.statistics.sceneFlicker", int.class);
  
      /**
       * <p>Operating mode for hot pixel map generation.</p>
       * <p>If set to <code>true</code>, a hot pixel map is returned in {@link CaptureResult#STATISTICS_HOT_PIXEL_MAP android.statistics.hotPixelMap}.
       * If set to <code>false</code>, no hot pixel map will be returned.</p>
       * <p><b>Range of valid values:</b><br>
       * {@link CameraCharacteristics#STATISTICS_INFO_AVAILABLE_HOT_PIXEL_MAP_MODES android.statistics.info.availableHotPixelMapModes}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CaptureResult#STATISTICS_HOT_PIXEL_MAP
       * @see CameraCharacteristics#STATISTICS_INFO_AVAILABLE_HOT_PIXEL_MAP_MODES
       */
      @PublicKey
      @NonNull
      public static final Key<Boolean> STATISTICS_HOT_PIXEL_MAP_MODE =
              new Key<Boolean>("android.statistics.hotPixelMapMode", boolean.class);
  
      /**
       * <p>List of <code>(x, y)</code> coordinates of hot/defective pixels on the sensor.</p>
       * <p>A coordinate <code>(x, y)</code> must lie between <code>(0, 0)</code>, and
       * <code>(width - 1, height - 1)</code> (inclusive), which are the top-left and
       * bottom-right of the pixel array, respectively. The width and
       * height dimensions are given in {@link CameraCharacteristics#SENSOR_INFO_PIXEL_ARRAY_SIZE android.sensor.info.pixelArraySize}.
       * This may include hot pixels that lie outside of the active array
       * bounds given by {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.</p>
       * <p><b>Range of valid values:</b><br></p>
       * <p>n &lt;= number of pixels on the sensor.
       * The <code>(x, y)</code> coordinates must be bounded by
       * {@link CameraCharacteristics#SENSOR_INFO_PIXEL_ARRAY_SIZE android.sensor.info.pixelArraySize}.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
       * @see CameraCharacteristics#SENSOR_INFO_PIXEL_ARRAY_SIZE
       */
      @PublicKey
      @NonNull
      public static final Key<android.graphics.Point[]> STATISTICS_HOT_PIXEL_MAP =
              new Key<android.graphics.Point[]>("android.statistics.hotPixelMap", android.graphics.Point[].class);
  
      /**
       * <p>Whether the camera device will output the lens
       * shading map in output result metadata.</p>
       * <p>When set to ON,
       * android.statistics.lensShadingMap will be provided in
       * the output result metadata.</p>
       * <p>ON is always supported on devices with the RAW capability.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #STATISTICS_LENS_SHADING_MAP_MODE_OFF OFF}</li>
       *   <li>{@link #STATISTICS_LENS_SHADING_MAP_MODE_ON ON}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#STATISTICS_INFO_AVAILABLE_LENS_SHADING_MAP_MODES android.statistics.info.availableLensShadingMapModes}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#STATISTICS_INFO_AVAILABLE_LENS_SHADING_MAP_MODES
       * @see #STATISTICS_LENS_SHADING_MAP_MODE_OFF
       * @see #STATISTICS_LENS_SHADING_MAP_MODE_ON
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> STATISTICS_LENS_SHADING_MAP_MODE =
              new Key<Integer>("android.statistics.lensShadingMapMode", int.class);
  
      /**
       * <p>A control for selecting whether optical stabilization (OIS) position
       * information is included in output result metadata.</p>
       * <p>Since optical image stabilization generally involves motion much faster than the duration
       * of individualq image exposure, multiple OIS samples can be included for a single capture
       * result. For example, if the OIS reporting operates at 200 Hz, a typical camera operating
       * at 30fps may have 6-7 OIS samples per capture result. This information can be combined
       * with the rolling shutter skew to account for lens motion during image exposure in
       * post-processing algorithms.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #STATISTICS_OIS_DATA_MODE_OFF OFF}</li>
       *   <li>{@link #STATISTICS_OIS_DATA_MODE_ON ON}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#STATISTICS_INFO_AVAILABLE_OIS_DATA_MODES android.statistics.info.availableOisDataModes}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CameraCharacteristics#STATISTICS_INFO_AVAILABLE_OIS_DATA_MODES
       * @see #STATISTICS_OIS_DATA_MODE_OFF
       * @see #STATISTICS_OIS_DATA_MODE_ON
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> STATISTICS_OIS_DATA_MODE =
              new Key<Integer>("android.statistics.oisDataMode", int.class);
  
      /**
       * <p>An array of timestamps of OIS samples, in nanoseconds.</p>
       * <p>The array contains the timestamps of OIS samples. The timestamps are in the same
       * timebase as and comparable to {@link CaptureResult#SENSOR_TIMESTAMP android.sensor.timestamp}.</p>
       * <p><b>Units</b>: nanoseconds</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CaptureResult#SENSOR_TIMESTAMP
       * @hide
       */
      public static final Key<long[]> STATISTICS_OIS_TIMESTAMPS =
              new Key<long[]>("android.statistics.oisTimestamps", long[].class);
  
      /**
       * <p>An array of shifts of OIS samples, in x direction.</p>
       * <p>The array contains the amount of shifts in x direction, in pixels, based on OIS samples.
       * A positive value is a shift from left to right in the pre-correction active array
       * coordinate system. For example, if the optical center is (1000, 500) in pre-correction
       * active array coordinates, a shift of (3, 0) puts the new optical center at (1003, 500).</p>
       * <p>The number of shifts must match the number of timestamps in
       * android.statistics.oisTimestamps.</p>
       * <p>The OIS samples are not affected by whether lens distortion correction is enabled (on
       * supporting devices). They are always reported in pre-correction active array coordinates,
       * since the scaling of OIS shifts would depend on the specific spot on the sensor the shift
       * is needed.</p>
       * <p><b>Units</b>: Pixels in active array.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * @hide
       */
      public static final Key<float[]> STATISTICS_OIS_X_SHIFTS =
              new Key<float[]>("android.statistics.oisXShifts", float[].class);
  
      /**
       * <p>An array of shifts of OIS samples, in y direction.</p>
       * <p>The array contains the amount of shifts in y direction, in pixels, based on OIS samples.
       * A positive value is a shift from top to bottom in pre-correction active array coordinate
       * system. For example, if the optical center is (1000, 500) in active array coordinates, a
       * shift of (0, 5) puts the new optical center at (1000, 505).</p>
       * <p>The number of shifts must match the number of timestamps in
       * android.statistics.oisTimestamps.</p>
       * <p>The OIS samples are not affected by whether lens distortion correction is enabled (on
       * supporting devices). They are always reported in pre-correction active array coordinates,
       * since the scaling of OIS shifts would depend on the specific spot on the sensor the shift
       * is needed.</p>
       * <p><b>Units</b>: Pixels in active array.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * @hide
       */
      public static final Key<float[]> STATISTICS_OIS_Y_SHIFTS =
              new Key<float[]>("android.statistics.oisYShifts", float[].class);
  
      /**
       * <p>An array of optical stabilization (OIS) position samples.</p>
       * <p>Each OIS sample contains the timestamp and the amount of shifts in x and y direction,
       * in pixels, of the OIS sample.</p>
       * <p>A positive value for a shift in x direction is a shift from left to right in the
       * pre-correction active array coordinate system. For example, if the optical center is
       * (1000, 500) in pre-correction active array coordinates, a shift of (3, 0) puts the new
       * optical center at (1003, 500).</p>
       * <p>A positive value for a shift in y direction is a shift from top to bottom in
       * pre-correction active array coordinate system. For example, if the optical center is
       * (1000, 500) in active array coordinates, a shift of (0, 5) puts the new optical center at
       * (1000, 505).</p>
       * <p>The OIS samples are not affected by whether lens distortion correction is enabled (on
       * supporting devices). They are always reported in pre-correction active array coordinates,
       * since the scaling of OIS shifts would depend on the specific spot on the sensor the shift
       * is needed.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       */
      @PublicKey
      @NonNull
      @SyntheticKey
      public static final Key<android.hardware.camera2.params.OisSample[]> STATISTICS_OIS_SAMPLES =
              new Key<android.hardware.camera2.params.OisSample[]>("android.statistics.oisSamples", android.hardware.camera2.params.OisSample[].class);
  
      /**
       * <p>Tonemapping / contrast / gamma curve for the blue
       * channel, to use when {@link CaptureRequest#TONEMAP_MODE android.tonemap.mode} is
       * CONTRAST_CURVE.</p>
       * <p>See android.tonemap.curveRed for more details.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CaptureRequest#TONEMAP_MODE
       * @hide
       */
      public static final Key<float[]> TONEMAP_CURVE_BLUE =
              new Key<float[]>("android.tonemap.curveBlue", float[].class);
  
      /**
       * <p>Tonemapping / contrast / gamma curve for the green
       * channel, to use when {@link CaptureRequest#TONEMAP_MODE android.tonemap.mode} is
       * CONTRAST_CURVE.</p>
       * <p>See android.tonemap.curveRed for more details.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CaptureRequest#TONEMAP_MODE
       * @hide
       */
      public static final Key<float[]> TONEMAP_CURVE_GREEN =
              new Key<float[]>("android.tonemap.curveGreen", float[].class);
  
      /**
       * <p>Tonemapping / contrast / gamma curve for the red
       * channel, to use when {@link CaptureRequest#TONEMAP_MODE android.tonemap.mode} is
       * CONTRAST_CURVE.</p>
       * <p>Each channel's curve is defined by an array of control points:</p>
       * <pre><code>android.tonemap.curveRed =
       *   [ P0in, P0out, P1in, P1out, P2in, P2out, P3in, P3out, ..., PNin, PNout ]
       * 2 &lt;= N &lt;= {@link CameraCharacteristics#TONEMAP_MAX_CURVE_POINTS android.tonemap.maxCurvePoints}</code></pre>
       * <p>These are sorted in order of increasing <code>Pin</code>; it is
       * required that input values 0.0 and 1.0 are included in the list to
       * define a complete mapping. For input values between control points,
       * the camera device must linearly interpolate between the control
       * points.</p>
       * <p>Each curve can have an independent number of points, and the number
       * of points can be less than max (that is, the request doesn't have to
       * always provide a curve with number of points equivalent to
       * {@link CameraCharacteristics#TONEMAP_MAX_CURVE_POINTS android.tonemap.maxCurvePoints}).</p>
       * <p>For devices with MONOCHROME capability, all three channels must have the same set of
       * control points.</p>
       * <p>A few examples, and their corresponding graphical mappings; these
       * only specify the red channel and the precision is limited to 4
       * digits, for conciseness.</p>
       * <p>Linear mapping:</p>
       * <pre><code>android.tonemap.curveRed = [ 0, 0, 1.0, 1.0 ]
       * </code></pre>
       * <p><img alt="Linear mapping curve" src="/reference/images/camera2/metadata/android.tonemap.curveRed/linear_tonemap.png" /></p>
       * <p>Invert mapping:</p>
       * <pre><code>android.tonemap.curveRed = [ 0, 1.0, 1.0, 0 ]
       * </code></pre>
       * <p><img alt="Inverting mapping curve" src="/reference/images/camera2/metadata/android.tonemap.curveRed/inverse_tonemap.png" /></p>
       * <p>Gamma 1/2.2 mapping, with 16 control points:</p>
       * <pre><code>android.tonemap.curveRed = [
       *   0.0000, 0.0000, 0.0667, 0.2920, 0.1333, 0.4002, 0.2000, 0.4812,
       *   0.2667, 0.5484, 0.3333, 0.6069, 0.4000, 0.6594, 0.4667, 0.7072,
       *   0.5333, 0.7515, 0.6000, 0.7928, 0.6667, 0.8317, 0.7333, 0.8685,
       *   0.8000, 0.9035, 0.8667, 0.9370, 0.9333, 0.9691, 1.0000, 1.0000 ]
       * </code></pre>
       * <p><img alt="Gamma = 1/2.2 tonemapping curve" src="/reference/images/camera2/metadata/android.tonemap.curveRed/gamma_tonemap.png" /></p>
       * <p>Standard sRGB gamma mapping, per IEC 61966-2-1:1999, with 16 control points:</p>
       * <pre><code>android.tonemap.curveRed = [
       *   0.0000, 0.0000, 0.0667, 0.2864, 0.1333, 0.4007, 0.2000, 0.4845,
       *   0.2667, 0.5532, 0.3333, 0.6125, 0.4000, 0.6652, 0.4667, 0.7130,
       *   0.5333, 0.7569, 0.6000, 0.7977, 0.6667, 0.8360, 0.7333, 0.8721,
       *   0.8000, 0.9063, 0.8667, 0.9389, 0.9333, 0.9701, 1.0000, 1.0000 ]
       * </code></pre>
       * <p><img alt="sRGB tonemapping curve" src="/reference/images/camera2/metadata/android.tonemap.curveRed/srgb_tonemap.png" /></p>
       * <p><b>Range of valid values:</b><br>
       * 0-1 on both input and output coordinates, normalized
       * as a floating-point value such that 0 == black and 1 == white.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#TONEMAP_MAX_CURVE_POINTS
       * @see CaptureRequest#TONEMAP_MODE
       * @hide
       */
      public static final Key<float[]> TONEMAP_CURVE_RED =
              new Key<float[]>("android.tonemap.curveRed", float[].class);
  
      /**
       * <p>Tonemapping / contrast / gamma curve to use when {@link CaptureRequest#TONEMAP_MODE android.tonemap.mode}
       * is CONTRAST_CURVE.</p>
       * <p>The tonemapCurve consist of three curves for each of red, green, and blue
       * channels respectively. The following example uses the red channel as an
       * example. The same logic applies to green and blue channel.
       * Each channel's curve is defined by an array of control points:</p>
       * <pre><code>curveRed =
       *   [ P0(in, out), P1(in, out), P2(in, out), P3(in, out), ..., PN(in, out) ]
       * 2 &lt;= N &lt;= {@link CameraCharacteristics#TONEMAP_MAX_CURVE_POINTS android.tonemap.maxCurvePoints}</code></pre>
       * <p>These are sorted in order of increasing <code>Pin</code>; it is always
       * guaranteed that input values 0.0 and 1.0 are included in the list to
       * define a complete mapping. For input values between control points,
       * the camera device must linearly interpolate between the control
       * points.</p>
       * <p>Each curve can have an independent number of points, and the number
       * of points can be less than max (that is, the request doesn't have to
       * always provide a curve with number of points equivalent to
       * {@link CameraCharacteristics#TONEMAP_MAX_CURVE_POINTS android.tonemap.maxCurvePoints}).</p>
       * <p>For devices with MONOCHROME capability, all three channels must have the same set of
       * control points.</p>
       * <p>A few examples, and their corresponding graphical mappings; these
       * only specify the red channel and the precision is limited to 4
       * digits, for conciseness.</p>
       * <p>Linear mapping:</p>
       * <pre><code>curveRed = [ (0, 0), (1.0, 1.0) ]
       * </code></pre>
       * <p><img alt="Linear mapping curve" src="/reference/images/camera2/metadata/android.tonemap.curveRed/linear_tonemap.png" /></p>
       * <p>Invert mapping:</p>
       * <pre><code>curveRed = [ (0, 1.0), (1.0, 0) ]
       * </code></pre>
       * <p><img alt="Inverting mapping curve" src="/reference/images/camera2/metadata/android.tonemap.curveRed/inverse_tonemap.png" /></p>
       * <p>Gamma 1/2.2 mapping, with 16 control points:</p>
       * <pre><code>curveRed = [
       *   (0.0000, 0.0000), (0.0667, 0.2920), (0.1333, 0.4002), (0.2000, 0.4812),
       *   (0.2667, 0.5484), (0.3333, 0.6069), (0.4000, 0.6594), (0.4667, 0.7072),
       *   (0.5333, 0.7515), (0.6000, 0.7928), (0.6667, 0.8317), (0.7333, 0.8685),
       *   (0.8000, 0.9035), (0.8667, 0.9370), (0.9333, 0.9691), (1.0000, 1.0000) ]
       * </code></pre>
       * <p><img alt="Gamma = 1/2.2 tonemapping curve" src="/reference/images/camera2/metadata/android.tonemap.curveRed/gamma_tonemap.png" /></p>
       * <p>Standard sRGB gamma mapping, per IEC 61966-2-1:1999, with 16 control points:</p>
       * <pre><code>curveRed = [
       *   (0.0000, 0.0000), (0.0667, 0.2864), (0.1333, 0.4007), (0.2000, 0.4845),
       *   (0.2667, 0.5532), (0.3333, 0.6125), (0.4000, 0.6652), (0.4667, 0.7130),
       *   (0.5333, 0.7569), (0.6000, 0.7977), (0.6667, 0.8360), (0.7333, 0.8721),
       *   (0.8000, 0.9063), (0.8667, 0.9389), (0.9333, 0.9701), (1.0000, 1.0000) ]
       * </code></pre>
       * <p><img alt="sRGB tonemapping curve" src="/reference/images/camera2/metadata/android.tonemap.curveRed/srgb_tonemap.png" /></p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#TONEMAP_MAX_CURVE_POINTS
       * @see CaptureRequest#TONEMAP_MODE
       */
      @PublicKey
      @NonNull
      @SyntheticKey
      public static final Key<android.hardware.camera2.params.TonemapCurve> TONEMAP_CURVE =
              new Key<android.hardware.camera2.params.TonemapCurve>("android.tonemap.curve", android.hardware.camera2.params.TonemapCurve.class);
  
      /**
       * <p>High-level global contrast/gamma/tonemapping control.</p>
       * <p>When switching to an application-defined contrast curve by setting
       * {@link CaptureRequest#TONEMAP_MODE android.tonemap.mode} to CONTRAST_CURVE, the curve is defined
       * per-channel with a set of <code>(in, out)</code> points that specify the
       * mapping from input high-bit-depth pixel value to the output
       * low-bit-depth value.  Since the actual pixel ranges of both input
       * and output may change depending on the camera pipeline, the values
       * are specified by normalized floating-point numbers.</p>
       * <p>More-complex color mapping operations such as 3D color look-up
       * tables, selective chroma enhancement, or other non-linear color
       * transforms will be disabled when {@link CaptureRequest#TONEMAP_MODE android.tonemap.mode} is
       * CONTRAST_CURVE.</p>
       * <p>When using either FAST or HIGH_QUALITY, the camera device will
       * emit its own tonemap curve in {@link CaptureRequest#TONEMAP_CURVE android.tonemap.curve}.
       * These values are always available, and as close as possible to the
       * actually used nonlinear/nonglobal transforms.</p>
       * <p>If a request is sent with CONTRAST_CURVE with the camera device's
       * provided curve in FAST or HIGH_QUALITY, the image's tonemap will be
       * roughly the same.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #TONEMAP_MODE_CONTRAST_CURVE CONTRAST_CURVE}</li>
       *   <li>{@link #TONEMAP_MODE_FAST FAST}</li>
       *   <li>{@link #TONEMAP_MODE_HIGH_QUALITY HIGH_QUALITY}</li>
       *   <li>{@link #TONEMAP_MODE_GAMMA_VALUE GAMMA_VALUE}</li>
       *   <li>{@link #TONEMAP_MODE_PRESET_CURVE PRESET_CURVE}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#TONEMAP_AVAILABLE_TONE_MAP_MODES android.tonemap.availableToneMapModes}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CameraCharacteristics#TONEMAP_AVAILABLE_TONE_MAP_MODES
       * @see CaptureRequest#TONEMAP_CURVE
       * @see CaptureRequest#TONEMAP_MODE
       * @see #TONEMAP_MODE_CONTRAST_CURVE
       * @see #TONEMAP_MODE_FAST
       * @see #TONEMAP_MODE_HIGH_QUALITY
       * @see #TONEMAP_MODE_GAMMA_VALUE
       * @see #TONEMAP_MODE_PRESET_CURVE
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> TONEMAP_MODE =
              new Key<Integer>("android.tonemap.mode", int.class);
  
      /**
       * <p>Tonemapping curve to use when {@link CaptureRequest#TONEMAP_MODE android.tonemap.mode} is
       * GAMMA_VALUE</p>
       * <p>The tonemap curve will be defined the following formula:
       * * OUT = pow(IN, 1.0 / gamma)
       * where IN and OUT is the input pixel value scaled to range [0.0, 1.0],
       * pow is the power function and gamma is the gamma value specified by this
       * key.</p>
       * <p>The same curve will be applied to all color channels. The camera device
       * may clip the input gamma value to its supported range. The actual applied
       * value will be returned in capture result.</p>
       * <p>The valid range of gamma value varies on different devices, but values
       * within [1.0, 5.0] are guaranteed not to be clipped.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CaptureRequest#TONEMAP_MODE
       */
      @PublicKey
      @NonNull
      public static final Key<Float> TONEMAP_GAMMA =
              new Key<Float>("android.tonemap.gamma", float.class);
  
      /**
       * <p>Tonemapping curve to use when {@link CaptureRequest#TONEMAP_MODE android.tonemap.mode} is
       * PRESET_CURVE</p>
       * <p>The tonemap curve will be defined by specified standard.</p>
       * <p>sRGB (approximated by 16 control points):</p>
       * <p><img alt="sRGB tonemapping curve" src="/reference/images/camera2/metadata/android.tonemap.curveRed/srgb_tonemap.png" /></p>
       * <p>Rec. 709 (approximated by 16 control points):</p>
       * <p><img alt="Rec. 709 tonemapping curve" src="/reference/images/camera2/metadata/android.tonemap.curveRed/rec709_tonemap.png" /></p>
       * <p>Note that above figures show a 16 control points approximation of preset
       * curves. Camera devices may apply a different approximation to the curve.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #TONEMAP_PRESET_CURVE_SRGB SRGB}</li>
       *   <li>{@link #TONEMAP_PRESET_CURVE_REC709 REC709}</li>
       * </ul></p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CaptureRequest#TONEMAP_MODE
       * @see #TONEMAP_PRESET_CURVE_SRGB
       * @see #TONEMAP_PRESET_CURVE_REC709
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> TONEMAP_PRESET_CURVE =
              new Key<Integer>("android.tonemap.presetCurve", int.class);
  
      /**
       * <p>This LED is nominally used to indicate to the user
       * that the camera is powered on and may be streaming images back to the
       * Application Processor. In certain rare circumstances, the OS may
       * disable this when video is processed locally and not transmitted to
       * any untrusted applications.</p>
       * <p>In particular, the LED <em>must</em> always be on when the data could be
       * transmitted off the device. The LED <em>should</em> always be on whenever
       * data is stored locally on the device.</p>
       * <p>The LED <em>may</em> be off if a trusted application is using the data that
       * doesn't violate the above rules.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * @hide
       */
      public static final Key<Boolean> LED_TRANSMIT =
              new Key<Boolean>("android.led.transmit", boolean.class);
  
      /**
       * <p>Whether black-level compensation is locked
       * to its current values, or is free to vary.</p>
       * <p>Whether the black level offset was locked for this frame.  Should be
       * ON if {@link CaptureRequest#BLACK_LEVEL_LOCK android.blackLevel.lock} was ON in the capture request, unless
       * a change in other capture settings forced the camera device to
       * perform a black level reset.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Full capability</b> -
       * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#BLACK_LEVEL_LOCK
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       */
      @PublicKey
      @NonNull
      public static final Key<Boolean> BLACK_LEVEL_LOCK =
              new Key<Boolean>("android.blackLevel.lock", boolean.class);
  
      /**
       * <p>The frame number corresponding to the last request
       * with which the output result (metadata + buffers) has been fully
       * synchronized.</p>
       * <p>When a request is submitted to the camera device, there is usually a
       * delay of several frames before the controls get applied. A camera
       * device may either choose to account for this delay by implementing a
       * pipeline and carefully submit well-timed atomic control updates, or
       * it may start streaming control changes that span over several frame
       * boundaries.</p>
       * <p>In the latter case, whenever a request's settings change relative to
       * the previous submitted request, the full set of changes may take
       * multiple frame durations to fully take effect. Some settings may
       * take effect sooner (in less frame durations) than others.</p>
       * <p>While a set of control changes are being propagated, this value
       * will be CONVERGING.</p>
       * <p>Once it is fully known that a set of control changes have been
       * finished propagating, and the resulting updated control settings
       * have been read back by the camera device, this value will be set
       * to a non-negative frame number (corresponding to the request to
       * which the results have synchronized to).</p>
       * <p>Older camera device implementations may not have a way to detect
       * when all camera controls have been applied, and will always set this
       * value to UNKNOWN.</p>
       * <p>FULL capability devices will always have this value set to the
       * frame number of the request corresponding to this result.</p>
       * <p><em>Further details</em>:</p>
       * <ul>
       * <li>Whenever a request differs from the last request, any future
       * results not yet returned may have this value set to CONVERGING (this
       * could include any in-progress captures not yet returned by the camera
       * device, for more details see pipeline considerations below).</li>
       * <li>Submitting a series of multiple requests that differ from the
       * previous request (e.g. r1, r2, r3 s.t. r1 != r2 != r3)
       * moves the new synchronization frame to the last non-repeating
       * request (using the smallest frame number from the contiguous list of
       * repeating requests).</li>
       * <li>Submitting the same request repeatedly will not change this value
       * to CONVERGING, if it was already a non-negative value.</li>
       * <li>When this value changes to non-negative, that means that all of the
       * metadata controls from the request have been applied, all of the
       * metadata controls from the camera device have been read to the
       * updated values (into the result), and all of the graphics buffers
       * corresponding to this result are also synchronized to the request.</li>
       * </ul>
       * <p><em>Pipeline considerations</em>:</p>
       * <p>Submitting a request with updated controls relative to the previously
       * submitted requests may also invalidate the synchronization state
       * of all the results corresponding to currently in-flight requests.</p>
       * <p>In other words, results for this current request and up to
       * {@link CameraCharacteristics#REQUEST_PIPELINE_MAX_DEPTH android.request.pipelineMaxDepth} prior requests may have their
       * android.sync.frameNumber change to CONVERGING.</p>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #SYNC_FRAME_NUMBER_CONVERGING CONVERGING}</li>
       *   <li>{@link #SYNC_FRAME_NUMBER_UNKNOWN UNKNOWN}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * Either a non-negative value corresponding to a
       * <code>frame_number</code>, or one of the two enums (CONVERGING / UNKNOWN).</p>
       * <p>This key is available on all devices.</p>
       *
       * @see CameraCharacteristics#REQUEST_PIPELINE_MAX_DEPTH
       * @see #SYNC_FRAME_NUMBER_CONVERGING
       * @see #SYNC_FRAME_NUMBER_UNKNOWN
       * @hide
       */
      public static final Key<Long> SYNC_FRAME_NUMBER =
              new Key<Long>("android.sync.frameNumber", long.class);
  
      /**
       * <p>The amount of exposure time increase factor applied to the original output
       * frame by the application processing before sending for reprocessing.</p>
       * <p>This is optional, and will be supported if the camera device supports YUV_REPROCESSING
       * capability ({@link CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES android.request.availableCapabilities} contains YUV_REPROCESSING).</p>
       * <p>For some YUV reprocessing use cases, the application may choose to filter the original
       * output frames to effectively reduce the noise to the same level as a frame that was
       * captured with longer exposure time. To be more specific, assuming the original captured
       * images were captured with a sensitivity of S and an exposure time of T, the model in
       * the camera device is that the amount of noise in the image would be approximately what
       * would be expected if the original capture parameters had been a sensitivity of
       * S/effectiveExposureFactor and an exposure time of T*effectiveExposureFactor, rather
       * than S and T respectively. If the captured images were processed by the application
       * before being sent for reprocessing, then the application may have used image processing
       * algorithms and/or multi-frame image fusion to reduce the noise in the
       * application-processed images (input images). By using the effectiveExposureFactor
       * control, the application can communicate to the camera device the actual noise level
       * improvement in the application-processed image. With this information, the camera
       * device can select appropriate noise reduction and edge enhancement parameters to avoid
       * excessive noise reduction ({@link CaptureRequest#NOISE_REDUCTION_MODE android.noiseReduction.mode}) and insufficient edge
       * enhancement ({@link CaptureRequest#EDGE_MODE android.edge.mode}) being applied to the reprocessed frames.</p>
       * <p>For example, for multi-frame image fusion use case, the application may fuse
       * multiple output frames together to a final frame for reprocessing. When N image are
       * fused into 1 image for reprocessing, the exposure time increase factor could be up to
       * square root of N (based on a simple photon shot noise model). The camera device will
       * adjust the reprocessing noise reduction and edge enhancement parameters accordingly to
       * produce the best quality images.</p>
       * <p>This is relative factor, 1.0 indicates the application hasn't processed the input
       * buffer in a way that affects its effective exposure time.</p>
       * <p>This control is only effective for YUV reprocessing capture request. For noise
       * reduction reprocessing, it is only effective when <code>{@link CaptureRequest#NOISE_REDUCTION_MODE android.noiseReduction.mode} != OFF</code>.
       * Similarly, for edge enhancement reprocessing, it is only effective when
       * <code>{@link CaptureRequest#EDGE_MODE android.edge.mode} != OFF</code>.</p>
       * <p><b>Units</b>: Relative exposure time increase factor.</p>
       * <p><b>Range of valid values:</b><br>
       * &gt;= 1.0</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       * <p><b>Limited capability</b> -
       * Present on all camera devices that report being at least {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED HARDWARE_LEVEL_LIMITED} devices in the
       * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
       *
       * @see CaptureRequest#EDGE_MODE
       * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
       * @see CaptureRequest#NOISE_REDUCTION_MODE
       * @see CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES
       */
      @PublicKey
      @NonNull
      public static final Key<Float> REPROCESS_EFFECTIVE_EXPOSURE_FACTOR =
              new Key<Float>("android.reprocess.effectiveExposureFactor", float.class);
  
      /**
       * <p>String containing the ID of the underlying active physical camera.</p>
       * <p>The ID of the active physical camera that's backing the logical camera. All camera
       * streams and metadata that are not physical camera specific will be originating from this
       * physical camera.</p>
       * <p>For a logical camera made up of physical cameras where each camera's lenses have
       * different characteristics, the camera device may choose to switch between the physical
       * cameras when application changes FOCAL_LENGTH or SCALER_CROP_REGION.
       * At the time of lens switch, this result metadata reflects the new active physical camera
       * ID.</p>
       * <p>This key will be available if the camera device advertises this key via {@link android.hardware.camera2.CameraCharacteristics#getAvailableCaptureResultKeys }.
       * When available, this must be one of valid physical IDs backing this logical multi-camera.
       * If this key is not available for a logical multi-camera, the camera device implementation
       * may still switch between different active physical cameras based on use case, but the
       * current active physical camera information won't be available to the application.</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       */
      @PublicKey
      @NonNull
      public static final Key<String> LOGICAL_MULTI_CAMERA_ACTIVE_PHYSICAL_ID =
              new Key<String>("android.logicalMultiCamera.activePhysicalId", String.class);
  
      /**
       * <p>Mode of operation for the lens distortion correction block.</p>
       * <p>The lens distortion correction block attempts to improve image quality by fixing
       * radial, tangential, or other geometric aberrations in the camera device's optics.  If
       * available, the {@link CameraCharacteristics#LENS_DISTORTION android.lens.distortion} field documents the lens's distortion parameters.</p>
       * <p>OFF means no distortion correction is done.</p>
       * <p>FAST/HIGH_QUALITY both mean camera device determined distortion correction will be
       * applied. HIGH_QUALITY mode indicates that the camera device will use the highest-quality
       * correction algorithms, even if it slows down capture rate. FAST means the camera device
       * will not slow down capture rate when applying correction. FAST may be the same as OFF if
       * any correction at all would slow down capture rate.  Every output stream will have a
       * similar amount of enhancement applied.</p>
       * <p>The correction only applies to processed outputs such as YUV, Y8, JPEG, or DEPTH16; it is
       * not applied to any RAW output.</p>
       * <p>This control will be on by default on devices that support this control. Applications
       * disabling distortion correction need to pay extra attention with the coordinate system of
       * metering regions, crop region, and face rectangles. When distortion correction is OFF,
       * metadata coordinates follow the coordinate system of
       * {@link CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE android.sensor.info.preCorrectionActiveArraySize}. When distortion is not OFF, metadata
       * coordinates follow the coordinate system of {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.  The
       * camera device will map these metadata fields to match the corrected image produced by the
       * camera device, for both capture requests and results.  However, this mapping is not very
       * precise, since rectangles do not generally map to rectangles when corrected.  Only linear
       * scaling between the active array and precorrection active array coordinates is
       * performed. Applications that require precise correction of metadata need to undo that
       * linear scaling, and apply a more complete correction that takes into the account the app's
       * own requirements.</p>
       * <p>The full list of metadata that is affected in this way by distortion correction is:</p>
       * <ul>
       * <li>{@link CaptureRequest#CONTROL_AF_REGIONS android.control.afRegions}</li>
       * <li>{@link CaptureRequest#CONTROL_AE_REGIONS android.control.aeRegions}</li>
       * <li>{@link CaptureRequest#CONTROL_AWB_REGIONS android.control.awbRegions}</li>
       * <li>{@link CaptureRequest#SCALER_CROP_REGION android.scaler.cropRegion}</li>
       * <li>{@link CaptureResult#STATISTICS_FACES android.statistics.faces}</li>
       * </ul>
       * <p><b>Possible values:</b>
       * <ul>
       *   <li>{@link #DISTORTION_CORRECTION_MODE_OFF OFF}</li>
       *   <li>{@link #DISTORTION_CORRECTION_MODE_FAST FAST}</li>
       *   <li>{@link #DISTORTION_CORRECTION_MODE_HIGH_QUALITY HIGH_QUALITY}</li>
       * </ul></p>
       * <p><b>Available values for this device:</b><br>
       * {@link CameraCharacteristics#DISTORTION_CORRECTION_AVAILABLE_MODES android.distortionCorrection.availableModes}</p>
       * <p><b>Optional</b> - The value for this key may be {@code null} on some devices.</p>
       *
       * @see CaptureRequest#CONTROL_AE_REGIONS
       * @see CaptureRequest#CONTROL_AF_REGIONS
       * @see CaptureRequest#CONTROL_AWB_REGIONS
       * @see CameraCharacteristics#DISTORTION_CORRECTION_AVAILABLE_MODES
       * @see CameraCharacteristics#LENS_DISTORTION
       * @see CaptureRequest#SCALER_CROP_REGION
       * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
       * @see CameraCharacteristics#SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
       * @see CaptureResult#STATISTICS_FACES
       * @see #DISTORTION_CORRECTION_MODE_OFF
       * @see #DISTORTION_CORRECTION_MODE_FAST
       * @see #DISTORTION_CORRECTION_MODE_HIGH_QUALITY
       */
      @PublicKey
      @NonNull
      public static final Key<Integer> DISTORTION_CORRECTION_MODE =
              new Key<Integer>("android.distortionCorrection.mode", int.class);
  
      /*~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~
       * End generated code
       *~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~O@*/
  
  
  
  
  
  
  }
  