content: /*
   * Copyright (C) 2008 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;
  
  import static android.system.OsConstants.*;
  
  import android.annotation.Nullable;
  import android.annotation.SdkConstant;
  import android.annotation.SdkConstant.SdkConstantType;
  import android.annotation.UnsupportedAppUsage;
  import android.app.ActivityThread;
  import android.app.AppOpsManager;
  import android.content.Context;
  import android.graphics.ImageFormat;
  import android.graphics.Point;
  import android.graphics.Rect;
  import android.graphics.SurfaceTexture;
  import android.media.AudioAttributes;
  import android.media.IAudioService;
  import android.os.Build;
  import android.os.Handler;
  import android.os.IBinder;
  import android.os.Looper;
  import android.os.Message;
  import android.os.Process;
  import android.os.RemoteException;
  import android.os.ServiceManager;
  import android.renderscript.Allocation;
  import android.renderscript.Element;
  import android.renderscript.RSIllegalArgumentException;
  import android.renderscript.RenderScript;
  import android.renderscript.Type;
  import android.text.TextUtils;
  import android.util.Log;
  import android.view.Surface;
  import android.view.SurfaceHolder;
  
  import com.android.internal.annotations.GuardedBy;
  import com.android.internal.app.IAppOpsCallback;
  import com.android.internal.app.IAppOpsService;
  
  import java.io.IOException;
  import java.lang.ref.WeakReference;
  import java.util.ArrayList;
  import java.util.LinkedHashMap;
  import java.util.List;
  
  /**
   * The Camera class is used to set image capture settings, start/stop preview,
   * snap pictures, and retrieve frames for encoding for video.  This class is a
   * client for the Camera service, which manages the actual camera hardware.
   *
   * <p>To access the device camera, you must declare the
   * {@link android.Manifest.permission#CAMERA} permission in your Android
   * Manifest. Also be sure to include the
   * <a href="{@docRoot}guide/topics/manifest/uses-feature-element.html">&lt;uses-feature></a>
   * manifest element to declare camera features used by your application.
   * For example, if you use the camera and auto-focus feature, your Manifest
   * should include the following:</p>
   * <pre> &lt;uses-permission android:name="android.permission.CAMERA" />
   * &lt;uses-feature android:name="android.hardware.camera" />
   * &lt;uses-feature android:name="android.hardware.camera.autofocus" /></pre>
   *
   * <p>To take pictures with this class, use the following steps:</p>
   *
   * <ol>
   * <li>Obtain an instance of Camera from {@link #open(int)}.
   *
   * <li>Get existing (default) settings with {@link #getParameters()}.
   *
   * <li>If necessary, modify the returned {@link Camera.Parameters} object and call
   * {@link #setParameters(Camera.Parameters)}.
   *
   * <li>Call {@link #setDisplayOrientation(int)} to ensure correct orientation of preview.
   *
   * <li><b>Important</b>: Pass a fully initialized {@link SurfaceHolder} to
   * {@link #setPreviewDisplay(SurfaceHolder)}.  Without a surface, the camera
   * will be unable to start the preview.
   *
   * <li><b>Important</b>: Call {@link #startPreview()} to start updating the
   * preview surface.  Preview must be started before you can take a picture.
   *
   * <li>When you want, call {@link #takePicture(Camera.ShutterCallback,
   * Camera.PictureCallback, Camera.PictureCallback, Camera.PictureCallback)} to
   * capture a photo.  Wait for the callbacks to provide the actual image data.
   *
   * <li>After taking a picture, preview display will have stopped.  To take more
   * photos, call {@link #startPreview()} again first.
   *
   * <li>Call {@link #stopPreview()} to stop updating the preview surface.
   *
   * <li><b>Important:</b> Call {@link #release()} to release the camera for
   * use by other applications.  Applications should release the camera
   * immediately in {@link android.app.Activity#onPause()} (and re-{@link #open()}
   * it in {@link android.app.Activity#onResume()}).
   * </ol>
   *
   * <p>To quickly switch to video recording mode, use these steps:</p>
   *
   * <ol>
   * <li>Obtain and initialize a Camera and start preview as described above.
   *
   * <li>Call {@link #unlock()} to allow the media process to access the camera.
   *
   * <li>Pass the camera to {@link android.media.MediaRecorder#setCamera(Camera)}.
   * See {@link android.media.MediaRecorder} information about video recording.
   *
   * <li>When finished recording, call {@link #reconnect()} to re-acquire
   * and re-lock the camera.
   *
   * <li>If desired, restart preview and take more photos or videos.
   *
   * <li>Call {@link #stopPreview()} and {@link #release()} as described above.
   * </ol>
   *
   * <p>This class is not thread-safe, and is meant for use from one event thread.
   * Most long-running operations (preview, focus, photo capture, etc) happen
   * asynchronously and invoke callbacks as necessary.  Callbacks will be invoked
   * on the event thread {@link #open(int)} was called from.  This class's methods
   * must never be called from multiple threads at once.</p>
   *
   * <p class="caution"><strong>Caution:</strong> Different Android-powered devices
   * may have different hardware specifications, such as megapixel ratings and
   * auto-focus capabilities. In order for your application to be compatible with
   * more devices, you should not make assumptions about the device camera
   * specifications.</p>
   *
   * <div class="special reference">
   * <h3>Developer Guides</h3>
   * <p>For more information about using cameras, read the
   * <a href="{@docRoot}guide/topics/media/camera.html">Camera</a> developer guide.</p>
   * </div>
   *
   * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
   *             applications.
   */
  @Deprecated
  public class Camera {
      private static final String TAG = "Camera";
  
      // These match the enums in frameworks/base/include/camera/Camera.h
      private static final int CAMERA_MSG_ERROR            = 0x001;
      private static final int CAMERA_MSG_SHUTTER          = 0x002;
      private static final int CAMERA_MSG_FOCUS            = 0x004;
      private static final int CAMERA_MSG_ZOOM             = 0x008;
      private static final int CAMERA_MSG_PREVIEW_FRAME    = 0x010;
      private static final int CAMERA_MSG_VIDEO_FRAME      = 0x020;
      private static final int CAMERA_MSG_POSTVIEW_FRAME   = 0x040;
      private static final int CAMERA_MSG_RAW_IMAGE        = 0x080;
      private static final int CAMERA_MSG_COMPRESSED_IMAGE = 0x100;
      private static final int CAMERA_MSG_RAW_IMAGE_NOTIFY = 0x200;
      private static final int CAMERA_MSG_PREVIEW_METADATA = 0x400;
      private static final int CAMERA_MSG_FOCUS_MOVE       = 0x800;
  
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      private long mNativeContext; // accessed by native methods
      private EventHandler mEventHandler;
      private ShutterCallback mShutterCallback;
      private PictureCallback mRawImageCallback;
      private PictureCallback mJpegCallback;
      private PreviewCallback mPreviewCallback;
      private boolean mUsingPreviewAllocation;
      private PictureCallback mPostviewCallback;
      private AutoFocusCallback mAutoFocusCallback;
      private AutoFocusMoveCallback mAutoFocusMoveCallback;
      private OnZoomChangeListener mZoomListener;
      private FaceDetectionListener mFaceListener;
      private ErrorCallback mErrorCallback;
      private ErrorCallback mDetailedErrorCallback;
      private boolean mOneShot;
      private boolean mWithBuffer;
      private boolean mFaceDetectionRunning = false;
      private final Object mAutoFocusCallbackLock = new Object();
  
      private final Object mShutterSoundLock = new Object();
      // for AppOps
      private @Nullable IAppOpsService mAppOps;
      private IAppOpsCallback mAppOpsCallback;
      @GuardedBy("mShutterSoundLock")
      private boolean mHasAppOpsPlayAudio = true;
      @GuardedBy("mShutterSoundLock")
      private boolean mShutterSoundEnabledFromApp = true;
  
      private static final int NO_ERROR = 0;
  
      /**
       * Broadcast Action:  A new picture is taken by the camera, and the entry of
       * the picture has been added to the media store.
       * {@link android.content.Intent#getData} is URI of the picture.
       *
       * <p>In {@link android.os.Build.VERSION_CODES#N Android N} this broadcast was removed, and
       * applications are recommended to use
       * {@link android.app.job.JobInfo.Builder JobInfo.Builder}.{@link android.app.job.JobInfo.Builder#addTriggerContentUri}
       * instead.</p>
       *
       * <p>In {@link android.os.Build.VERSION_CODES#O Android O} this broadcast has been brought
       * back, but only for <em>registered</em> receivers.  Apps that are actively running can
       * again listen to the broadcast if they want an immediate clear signal about a picture
       * being taken, however anything doing heavy work (or needing to be launched) as a result of
       * this should still use JobScheduler.</p>
       */
      @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
      public static final String ACTION_NEW_PICTURE = "android.hardware.action.NEW_PICTURE";
  
      /**
       * Broadcast Action:  A new video is recorded by the camera, and the entry
       * of the video has been added to the media store.
       * {@link android.content.Intent#getData} is URI of the video.
       *
       * <p>In {@link android.os.Build.VERSION_CODES#N Android N} this broadcast was removed, and
       * applications are recommended to use
       * {@link android.app.job.JobInfo.Builder JobInfo.Builder}.{@link android.app.job.JobInfo.Builder#addTriggerContentUri}
       * instead.</p>
       *
       * <p>In {@link android.os.Build.VERSION_CODES#O Android O} this broadcast has been brought
       * back, but only for <em>registered</em> receivers.  Apps that are actively running can
       * again listen to the broadcast if they want an immediate clear signal about a video
       * being taken, however anything doing heavy work (or needing to be launched) as a result of
       * this should still use JobScheduler.</p>
       */
      @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
      public static final String ACTION_NEW_VIDEO = "android.hardware.action.NEW_VIDEO";
  
      /**
       * Camera HAL device API version 1.0
       * @hide
       */
      @UnsupportedAppUsage
      public static final int CAMERA_HAL_API_VERSION_1_0 = 0x100;
  
      /**
       * A constant meaning the normal camera connect/open will be used.
       */
      private static final int CAMERA_HAL_API_VERSION_NORMAL_CONNECT = -2;
  
      /**
       * Used to indicate HAL version un-specified.
       */
      private static final int CAMERA_HAL_API_VERSION_UNSPECIFIED = -1;
  
      /**
       * Hardware face detection. It does not use much CPU.
       */
      private static final int CAMERA_FACE_DETECTION_HW = 0;
  
      /**
       * Software face detection. It uses some CPU.
       */
      private static final int CAMERA_FACE_DETECTION_SW = 1;
  
      /**
       * Returns the number of physical cameras available on this device.
       * The return value of this method might change dynamically if the device
       * supports external cameras and an external camera is connected or
       * disconnected.
       *
       * If there is a
       * {@link android.hardware.camera2.CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES_LOGICAL_MULTI_CAMERA
       * logical multi-camera} in the system, to maintain app backward compatibility, this method will
       * only expose one camera per facing for all logical camera and physical camera groups.
       * Use camera2 API to see all cameras.
       *
       * @return total number of accessible camera devices, or 0 if there are no
       *   cameras or an error was encountered enumerating them.
       */
      public native static int getNumberOfCameras();
  
      /**
       * Returns the information about a particular camera.
       * If {@link #getNumberOfCameras()} returns N, the valid id is 0 to N-1.
       *
       * @throws RuntimeException if an invalid ID is provided, or if there is an
       *    error retrieving the information (generally due to a hardware or other
       *    low-level failure).
       */
      public static void getCameraInfo(int cameraId, CameraInfo cameraInfo) {
          _getCameraInfo(cameraId, cameraInfo);
          IBinder b = ServiceManager.getService(Context.AUDIO_SERVICE);
          IAudioService audioService = IAudioService.Stub.asInterface(b);
          try {
              if (audioService.isCameraSoundForced()) {
                  // Only set this when sound is forced; otherwise let native code
                  // decide.
                  cameraInfo.canDisableShutterSound = false;
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Audio service is unavailable for queries");
          }
      }
      private native static void _getCameraInfo(int cameraId, CameraInfo cameraInfo);
  
      /**
       * Information about a camera
       *
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public static class CameraInfo {
          /**
           * The facing of the camera is opposite to that of the screen.
           */
          public static final int CAMERA_FACING_BACK = 0;
  
          /**
           * The facing of the camera is the same as that of the screen.
           */
          public static final int CAMERA_FACING_FRONT = 1;
  
          /**
           * The direction that the camera faces. It should be
           * CAMERA_FACING_BACK or CAMERA_FACING_FRONT.
           */
          public int facing;
  
          /**
           * <p>The orientation of the camera image. The value is the angle that the
           * camera image needs to be rotated clockwise so it shows correctly on
           * the display in its natural orientation. It should be 0, 90, 180, or 270.</p>
           *
           * <p>For example, suppose a device has a naturally tall screen. The
           * back-facing camera sensor is mounted in landscape. You are looking at
           * the screen. If the top side of the camera sensor is aligned with the
           * right edge of the screen in natural orientation, the value should be
           * 90. If the top side of a front-facing camera sensor is aligned with
           * the right of the screen, the value should be 270.</p>
           *
           * @see #setDisplayOrientation(int)
           * @see Parameters#setRotation(int)
           * @see Parameters#setPreviewSize(int, int)
           * @see Parameters#setPictureSize(int, int)
           * @see Parameters#setJpegThumbnailSize(int, int)
           */
          public int orientation;
  
          /**
           * <p>Whether the shutter sound can be disabled.</p>
           *
           * <p>On some devices, the camera shutter sound cannot be turned off
           * through {@link #enableShutterSound enableShutterSound}. This field
           * can be used to determine whether a call to disable the shutter sound
           * will succeed.</p>
           *
           * <p>If this field is set to true, then a call of
           * {@code enableShutterSound(false)} will be successful. If set to
           * false, then that call will fail, and the shutter sound will be played
           * when {@link Camera#takePicture takePicture} is called.</p>
           */
          public boolean canDisableShutterSound;
      };
  
      /**
       * Creates a new Camera object to access a particular hardware camera. If
       * the same camera is opened by other applications, this will throw a
       * RuntimeException.
       *
       * <p>You must call {@link #release()} when you are done using the camera,
       * otherwise it will remain locked and be unavailable to other applications.
       *
       * <p>Your application should only have one Camera object active at a time
       * for a particular hardware camera.
       *
       * <p>Callbacks from other methods are delivered to the event loop of the
       * thread which called open().  If this thread has no event loop, then
       * callbacks are delivered to the main application event loop.  If there
       * is no main application event loop, callbacks are not delivered.
       *
       * <p class="caution"><b>Caution:</b> On some devices, this method may
       * take a long time to complete.  It is best to call this method from a
       * worker thread (possibly using {@link android.os.AsyncTask}) to avoid
       * blocking the main application UI thread.
       *
       * @param cameraId the hardware camera to access, between 0 and
       *     {@link #getNumberOfCameras()}-1.
       * @return a new Camera object, connected, locked and ready for use.
       * @throws RuntimeException if opening the camera fails (for example, if the
       *     camera is in use by another process or device policy manager has
       *     disabled the camera).
       * @see android.app.admin.DevicePolicyManager#getCameraDisabled(android.content.ComponentName)
       */
      public static Camera open(int cameraId) {
          return new Camera(cameraId);
      }
  
      /**
       * Creates a new Camera object to access the first back-facing camera on the
       * device. If the device does not have a back-facing camera, this returns
       * null. Otherwise acts like the {@link #open(int)} call.
       *
       * @return a new Camera object for the first back-facing camera, or null if there is no
       *  backfacing camera
       * @see #open(int)
       */
      public static Camera open() {
          int numberOfCameras = getNumberOfCameras();
          CameraInfo cameraInfo = new CameraInfo();
          for (int i = 0; i < numberOfCameras; i++) {
              getCameraInfo(i, cameraInfo);
              if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
                  return new Camera(i);
              }
          }
          return null;
      }
  
      /**
       * Creates a new Camera object to access a particular hardware camera with
       * given hal API version. If the same camera is opened by other applications
       * or the hal API version is not supported by this device, this will throw a
       * RuntimeException.
       * <p>
       * You must call {@link #release()} when you are done using the camera,
       * otherwise it will remain locked and be unavailable to other applications.
       * <p>
       * Your application should only have one Camera object active at a time for
       * a particular hardware camera.
       * <p>
       * Callbacks from other methods are delivered to the event loop of the
       * thread which called open(). If this thread has no event loop, then
       * callbacks are delivered to the main application event loop. If there is
       * no main application event loop, callbacks are not delivered.
       * <p class="caution">
       * <b>Caution:</b> On some devices, this method may take a long time to
       * complete. It is best to call this method from a worker thread (possibly
       * using {@link android.os.AsyncTask}) to avoid blocking the main
       * application UI thread.
       *
       * @param cameraId The hardware camera to access, between 0 and
       * {@link #getNumberOfCameras()}-1.
       * @param halVersion The HAL API version this camera device to be opened as.
       * @return a new Camera object, connected, locked and ready for use.
       *
       * @throws IllegalArgumentException if the {@code halVersion} is invalid
       *
       * @throws RuntimeException if opening the camera fails (for example, if the
       * camera is in use by another process or device policy manager has disabled
       * the camera).
       *
       * @see android.app.admin.DevicePolicyManager#getCameraDisabled(android.content.ComponentName)
       * @see #CAMERA_HAL_API_VERSION_1_0
       *
       * @hide
       */
      @UnsupportedAppUsage
      public static Camera openLegacy(int cameraId, int halVersion) {
          if (halVersion < CAMERA_HAL_API_VERSION_1_0) {
              throw new IllegalArgumentException("Invalid HAL version " + halVersion);
          }
  
          return new Camera(cameraId, halVersion);
      }
  
      /**
       * Create a legacy camera object.
       *
       * @param cameraId The hardware camera to access, between 0 and
       * {@link #getNumberOfCameras()}-1.
       * @param halVersion The HAL API version this camera device to be opened as.
       */
      private Camera(int cameraId, int halVersion) {
          int err = cameraInitVersion(cameraId, halVersion);
          if (checkInitErrors(err)) {
              if (err == -EACCES) {
                  throw new RuntimeException("Fail to connect to camera service");
              } else if (err == -ENODEV) {
                  throw new RuntimeException("Camera initialization failed");
              } else if (err == -ENOSYS) {
                  throw new RuntimeException("Camera initialization failed because some methods"
                          + " are not implemented");
              } else if (err == -EOPNOTSUPP) {
                  throw new RuntimeException("Camera initialization failed because the hal"
                          + " version is not supported by this device");
              } else if (err == -EINVAL) {
                  throw new RuntimeException("Camera initialization failed because the input"
                          + " arugments are invalid");
              } else if (err == -EBUSY) {
                  throw new RuntimeException("Camera initialization failed because the camera"
                          + " device was already opened");
              } else if (err == -EUSERS) {
                  throw new RuntimeException("Camera initialization failed because the max"
                          + " number of camera devices were already opened");
              }
              // Should never hit this.
              throw new RuntimeException("Unknown camera error");
          }
      }
  
      private int cameraInitVersion(int cameraId, int halVersion) {
          mShutterCallback = null;
          mRawImageCallback = null;
          mJpegCallback = null;
          mPreviewCallback = null;
          mPostviewCallback = null;
          mUsingPreviewAllocation = false;
          mZoomListener = null;
  
          Looper looper;
          if ((looper = Looper.myLooper()) != null) {
              mEventHandler = new EventHandler(this, looper);
          } else if ((looper = Looper.getMainLooper()) != null) {
              mEventHandler = new EventHandler(this, looper);
          } else {
              mEventHandler = null;
          }
  
          return native_setup(new WeakReference<Camera>(this), cameraId, halVersion,
                  ActivityThread.currentOpPackageName());
      }
  
      private int cameraInitNormal(int cameraId) {
          return cameraInitVersion(cameraId, CAMERA_HAL_API_VERSION_NORMAL_CONNECT);
      }
  
      /**
       * Connect to the camera service using #connectLegacy
       *
       * <p>
       * This acts the same as normal except that it will return
       * the detailed error code if open fails instead of
       * converting everything into {@code NO_INIT}.</p>
       *
       * <p>Intended to use by the camera2 shim only, do <i>not</i> use this for other code.</p>
       *
       * @return a detailed errno error code, or {@code NO_ERROR} on success
       *
       * @hide
       */
      public int cameraInitUnspecified(int cameraId) {
          return cameraInitVersion(cameraId, CAMERA_HAL_API_VERSION_UNSPECIFIED);
      }
  
      /** used by Camera#open, Camera#open(int) */
      Camera(int cameraId) {
          int err = cameraInitNormal(cameraId);
          if (checkInitErrors(err)) {
              if (err == -EACCES) {
                  throw new RuntimeException("Fail to connect to camera service");
              } else if (err == -ENODEV) {
                  throw new RuntimeException("Camera initialization failed");
              }
              // Should never hit this.
              throw new RuntimeException("Unknown camera error");
          }
          initAppOps();
      }
  
  
      /**
       * @hide
       */
      public static boolean checkInitErrors(int err) {
          return err != NO_ERROR;
      }
  
      /**
       * @hide
       */
      public static Camera openUninitialized() {
          return new Camera();
      }
  
      /**
       * An empty Camera for testing purpose.
       */
      Camera() {}
  
      private void initAppOps() {
          IBinder b = ServiceManager.getService(Context.APP_OPS_SERVICE);
          mAppOps = IAppOpsService.Stub.asInterface(b);
          // initialize mHasAppOpsPlayAudio
          updateAppOpsPlayAudio();
          // register a callback to monitor whether the OP_PLAY_AUDIO is still allowed
          mAppOpsCallback = new IAppOpsCallbackWrapper(this);
          try {
              mAppOps.startWatchingMode(AppOpsManager.OP_PLAY_AUDIO,
                      ActivityThread.currentPackageName(), mAppOpsCallback);
          } catch (RemoteException e) {
              Log.e(TAG, "Error registering appOps callback", e);
              mHasAppOpsPlayAudio = false;
          }
      }
  
      private void releaseAppOps() {
          try {
              if (mAppOps != null) {
                  mAppOps.stopWatchingMode(mAppOpsCallback);
              }
          } catch (Exception e) {
              // nothing to do here, the object is supposed to be released anyway
          }
      }
  
      @Override
      protected void finalize() {
          release();
      }
  
      @UnsupportedAppUsage
      private native final int native_setup(Object camera_this, int cameraId, int halVersion,
                                             String packageName);
  
      private native final void native_release();
  
  
      /**
       * Disconnects and releases the Camera object resources.
       *
       * <p>You must call this as soon as you're done with the Camera object.</p>
       */
      public final void release() {
          native_release();
          mFaceDetectionRunning = false;
          releaseAppOps();
      }
  
      /**
       * Unlocks the camera to allow another process to access it.
       * Normally, the camera is locked to the process with an active Camera
       * object until {@link #release()} is called.  To allow rapid handoff
       * between processes, you can call this method to release the camera
       * temporarily for another process to use; once the other process is done
       * you can call {@link #reconnect()} to reclaim the camera.
       *
       * <p>This must be done before calling
       * {@link android.media.MediaRecorder#setCamera(Camera)}. This cannot be
       * called after recording starts.
       *
       * <p>If you are not recording video, you probably do not need this method.
       *
       * @throws RuntimeException if the camera cannot be unlocked.
       */
      public native final void unlock();
  
      /**
       * Re-locks the camera to prevent other processes from accessing it.
       * Camera objects are locked by default unless {@link #unlock()} is
       * called.  Normally {@link #reconnect()} is used instead.
       *
       * <p>Since API level 14, camera is automatically locked for applications in
       * {@link android.media.MediaRecorder#start()}. Applications can use the
       * camera (ex: zoom) after recording starts. There is no need to call this
       * after recording starts or stops.
       *
       * <p>If you are not recording video, you probably do not need this method.
       *
       * @throws RuntimeException if the camera cannot be re-locked (for
       *     example, if the camera is still in use by another process).
       */
      public native final void lock();
  
      /**
       * Reconnects to the camera service after another process used it.
       * After {@link #unlock()} is called, another process may use the
       * camera; when the process is done, you must reconnect to the camera,
       * which will re-acquire the lock and allow you to continue using the
       * camera.
       *
       * <p>Since API level 14, camera is automatically locked for applications in
       * {@link android.media.MediaRecorder#start()}. Applications can use the
       * camera (ex: zoom) after recording starts. There is no need to call this
       * after recording starts or stops.
       *
       * <p>If you are not recording video, you probably do not need this method.
       *
       * @throws IOException if a connection cannot be re-established (for
       *     example, if the camera is still in use by another process).
       * @throws RuntimeException if release() has been called on this Camera
       *     instance.
       */
      public native final void reconnect() throws IOException;
  
      /**
       * Sets the {@link Surface} to be used for live preview.
       * Either a surface or surface texture is necessary for preview, and
       * preview is necessary to take pictures.  The same surface can be re-set
       * without harm.  Setting a preview surface will un-set any preview surface
       * texture that was set via {@link #setPreviewTexture}.
       *
       * <p>The {@link SurfaceHolder} must already contain a surface when this
       * method is called.  If you are using {@link android.view.SurfaceView},
       * you will need to register a {@link SurfaceHolder.Callback} with
       * {@link SurfaceHolder#addCallback(SurfaceHolder.Callback)} and wait for
       * {@link SurfaceHolder.Callback#surfaceCreated(SurfaceHolder)} before
       * calling setPreviewDisplay() or starting preview.
       *
       * <p>This method must be called before {@link #startPreview()}.  The
       * one exception is that if the preview surface is not set (or set to null)
       * before startPreview() is called, then this method may be called once
       * with a non-null parameter to set the preview surface.  (This allows
       * camera setup and surface creation to happen in parallel, saving time.)
       * The preview surface may not otherwise change while preview is running.
       *
       * @param holder containing the Surface on which to place the preview,
       *     or null to remove the preview surface
       * @throws IOException if the method fails (for example, if the surface
       *     is unavailable or unsuitable).
       * @throws RuntimeException if release() has been called on this Camera
       *    instance.
       */
      public final void setPreviewDisplay(SurfaceHolder holder) throws IOException {
          if (holder != null) {
              setPreviewSurface(holder.getSurface());
          } else {
              setPreviewSurface((Surface)null);
          }
      }
  
      /**
       * @hide
       */
      @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
      public native final void setPreviewSurface(Surface surface) throws IOException;
  
      /**
       * Sets the {@link SurfaceTexture} to be used for live preview.
       * Either a surface or surface texture is necessary for preview, and
       * preview is necessary to take pictures.  The same surface texture can be
       * re-set without harm.  Setting a preview surface texture will un-set any
       * preview surface that was set via {@link #setPreviewDisplay}.
       *
       * <p>This method must be called before {@link #startPreview()}.  The
       * one exception is that if the preview surface texture is not set (or set
       * to null) before startPreview() is called, then this method may be called
       * once with a non-null parameter to set the preview surface.  (This allows
       * camera setup and surface creation to happen in parallel, saving time.)
       * The preview surface texture may not otherwise change while preview is
       * running.
       *
       * <p>The timestamps provided by {@link SurfaceTexture#getTimestamp()} for a
       * SurfaceTexture set as the preview texture have an unspecified zero point,
       * and cannot be directly compared between different cameras or different
       * instances of the same camera, or across multiple runs of the same
       * program.
       *
       * <p>If you are using the preview data to create video or still images,
       * strongly consider using {@link android.media.MediaActionSound} to
       * properly indicate image capture or recording start/stop to the user.</p>
       *
       * @see android.media.MediaActionSound
       * @see android.graphics.SurfaceTexture
       * @see android.view.TextureView
       * @param surfaceTexture the {@link SurfaceTexture} to which the preview
       *     images are to be sent or null to remove the current preview surface
       *     texture
       * @throws IOException if the method fails (for example, if the surface
       *     texture is unavailable or unsuitable).
       * @throws RuntimeException if release() has been called on this Camera
       *    instance.
       */
      public native final void setPreviewTexture(SurfaceTexture surfaceTexture) throws IOException;
  
      /**
       * Callback interface used to deliver copies of preview frames as
       * they are displayed.
       *
       * @see #setPreviewCallback(Camera.PreviewCallback)
       * @see #setOneShotPreviewCallback(Camera.PreviewCallback)
       * @see #setPreviewCallbackWithBuffer(Camera.PreviewCallback)
       * @see #startPreview()
       *
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public interface PreviewCallback
      {
          /**
           * Called as preview frames are displayed.  This callback is invoked
           * on the event thread {@link #open(int)} was called from.
           *
           * <p>If using the {@link android.graphics.ImageFormat#YV12} format,
           * refer to the equations in {@link Camera.Parameters#setPreviewFormat}
           * for the arrangement of the pixel data in the preview callback
           * buffers.
           *
           * @param data the contents of the preview frame in the format defined
           *  by {@link android.graphics.ImageFormat}, which can be queried
           *  with {@link android.hardware.Camera.Parameters#getPreviewFormat()}.
           *  If {@link android.hardware.Camera.Parameters#setPreviewFormat(int)}
           *             is never called, the default will be the YCbCr_420_SP
           *             (NV21) format.
           * @param camera the Camera service object.
           */
          void onPreviewFrame(byte[] data, Camera camera);
      };
  
      /**
       * Starts capturing and drawing preview frames to the screen.
       * Preview will not actually start until a surface is supplied
       * with {@link #setPreviewDisplay(SurfaceHolder)} or
       * {@link #setPreviewTexture(SurfaceTexture)}.
       *
       * <p>If {@link #setPreviewCallback(Camera.PreviewCallback)},
       * {@link #setOneShotPreviewCallback(Camera.PreviewCallback)}, or
       * {@link #setPreviewCallbackWithBuffer(Camera.PreviewCallback)} were
       * called, {@link Camera.PreviewCallback#onPreviewFrame(byte[], Camera)}
       * will be called when preview data becomes available.
       *
       * @throws RuntimeException if starting preview fails; usually this would be
       *    because of a hardware or other low-level error, or because release()
       *    has been called on this Camera instance. The QCIF (176x144) exception
       *    mentioned in {@link Parameters#setPreviewSize setPreviewSize} and
       *    {@link Parameters#setPictureSize setPictureSize} can also cause this
       *    exception be thrown.
       */
      public native final void startPreview();
  
      /**
       * Stops capturing and drawing preview frames to the surface, and
       * resets the camera for a future call to {@link #startPreview()}.
       *
       * @throws RuntimeException if stopping preview fails; usually this would be
       *    because of a hardware or other low-level error, or because release()
       *    has been called on this Camera instance.
       */
      public final void stopPreview() {
          _stopPreview();
          mFaceDetectionRunning = false;
  
          mShutterCallback = null;
          mRawImageCallback = null;
          mPostviewCallback = null;
          mJpegCallback = null;
          synchronized (mAutoFocusCallbackLock) {
              mAutoFocusCallback = null;
          }
          mAutoFocusMoveCallback = null;
      }
  
      private native final void _stopPreview();
  
      /**
       * Return current preview state.
       *
       * FIXME: Unhide before release
       * @hide
       */
      @UnsupportedAppUsage
      public native final boolean previewEnabled();
  
      /**
       * <p>Installs a callback to be invoked for every preview frame in addition
       * to displaying them on the screen.  The callback will be repeatedly called
       * for as long as preview is active.  This method can be called at any time,
       * even while preview is live.  Any other preview callbacks are
       * overridden.</p>
       *
       * <p>If you are using the preview data to create video or still images,
       * strongly consider using {@link android.media.MediaActionSound} to
       * properly indicate image capture or recording start/stop to the user.</p>
       *
       * @param cb a callback object that receives a copy of each preview frame,
       *     or null to stop receiving callbacks.
       * @throws RuntimeException if release() has been called on this Camera
       *     instance.
       * @see android.media.MediaActionSound
       */
      public final void setPreviewCallback(PreviewCallback cb) {
          mPreviewCallback = cb;
          mOneShot = false;
          mWithBuffer = false;
          if (cb != null) {
              mUsingPreviewAllocation = false;
          }
          // Always use one-shot mode. We fake camera preview mode by
          // doing one-shot preview continuously.
          setHasPreviewCallback(cb != null, false);
      }
  
      /**
       * <p>Installs a callback to be invoked for the next preview frame in
       * addition to displaying it on the screen.  After one invocation, the
       * callback is cleared. This method can be called any time, even when
       * preview is live.  Any other preview callbacks are overridden.</p>
       *
       * <p>If you are using the preview data to create video or still images,
       * strongly consider using {@link android.media.MediaActionSound} to
       * properly indicate image capture or recording start/stop to the user.</p>
       *
       * @param cb a callback object that receives a copy of the next preview frame,
       *     or null to stop receiving callbacks.
       * @throws RuntimeException if release() has been called on this Camera
       *     instance.
       * @see android.media.MediaActionSound
       */
      public final void setOneShotPreviewCallback(PreviewCallback cb) {
          mPreviewCallback = cb;
          mOneShot = true;
          mWithBuffer = false;
          if (cb != null) {
              mUsingPreviewAllocation = false;
          }
          setHasPreviewCallback(cb != null, false);
      }
  
      private native final void setHasPreviewCallback(boolean installed, boolean manualBuffer);
  
      /**
       * <p>Installs a callback to be invoked for every preview frame, using
       * buffers supplied with {@link #addCallbackBuffer(byte[])}, in addition to
       * displaying them on the screen.  The callback will be repeatedly called
       * for as long as preview is active and buffers are available.  Any other
       * preview callbacks are overridden.</p>
       *
       * <p>The purpose of this method is to improve preview efficiency and frame
       * rate by allowing preview frame memory reuse.  You must call
       * {@link #addCallbackBuffer(byte[])} at some point -- before or after
       * calling this method -- or no callbacks will received.</p>
       *
       * <p>The buffer queue will be cleared if this method is called with a null
       * callback, {@link #setPreviewCallback(Camera.PreviewCallback)} is called,
       * or {@link #setOneShotPreviewCallback(Camera.PreviewCallback)} is
       * called.</p>
       *
       * <p>If you are using the preview data to create video or still images,
       * strongly consider using {@link android.media.MediaActionSound} to
       * properly indicate image capture or recording start/stop to the user.</p>
       *
       * @param cb a callback object that receives a copy of the preview frame,
       *     or null to stop receiving callbacks and clear the buffer queue.
       * @throws RuntimeException if release() has been called on this Camera
       *     instance.
       * @see #addCallbackBuffer(byte[])
       * @see android.media.MediaActionSound
       */
      public final void setPreviewCallbackWithBuffer(PreviewCallback cb) {
          mPreviewCallback = cb;
          mOneShot = false;
          mWithBuffer = true;
          if (cb != null) {
              mUsingPreviewAllocation = false;
          }
          setHasPreviewCallback(cb != null, true);
      }
  
      /**
       * Adds a pre-allocated buffer to the preview callback buffer queue.
       * Applications can add one or more buffers to the queue. When a preview
       * frame arrives and there is still at least one available buffer, the
       * buffer will be used and removed from the queue. Then preview callback is
       * invoked with the buffer. If a frame arrives and there is no buffer left,
       * the frame is discarded. Applications should add buffers back when they
       * finish processing the data in them.
       *
       * <p>For formats besides YV12, the size of the buffer is determined by
       * multiplying the preview image width, height, and bytes per pixel. The
       * width and height can be read from
       * {@link Camera.Parameters#getPreviewSize()}. Bytes per pixel can be
       * computed from {@link android.graphics.ImageFormat#getBitsPerPixel(int)} /
       * 8, using the image format from
       * {@link Camera.Parameters#getPreviewFormat()}.
       *
       * <p>If using the {@link android.graphics.ImageFormat#YV12} format, the
       * size can be calculated using the equations listed in
       * {@link Camera.Parameters#setPreviewFormat}.
       *
       * <p>This method is only necessary when
       * {@link #setPreviewCallbackWithBuffer(PreviewCallback)} is used. When
       * {@link #setPreviewCallback(PreviewCallback)} or
       * {@link #setOneShotPreviewCallback(PreviewCallback)} are used, buffers
       * are automatically allocated. When a supplied buffer is too small to
       * hold the preview frame data, preview callback will return null and
       * the buffer will be removed from the buffer queue.
       *
       * @param callbackBuffer the buffer to add to the queue. The size of the
       *   buffer must match the values described above.
       * @see #setPreviewCallbackWithBuffer(PreviewCallback)
       */
      public final void addCallbackBuffer(byte[] callbackBuffer)
      {
          _addCallbackBuffer(callbackBuffer, CAMERA_MSG_PREVIEW_FRAME);
      }
  
      /**
       * Adds a pre-allocated buffer to the raw image callback buffer queue.
       * Applications can add one or more buffers to the queue. When a raw image
       * frame arrives and there is still at least one available buffer, the
       * buffer will be used to hold the raw image data and removed from the
       * queue. Then raw image callback is invoked with the buffer. If a raw
       * image frame arrives but there is no buffer left, the frame is
       * discarded. Applications should add buffers back when they finish
       * processing the data in them by calling this method again in order
       * to avoid running out of raw image callback buffers.
       *
       * <p>The size of the buffer is determined by multiplying the raw image
       * width, height, and bytes per pixel. The width and height can be
       * read from {@link Camera.Parameters#getPictureSize()}. Bytes per pixel
       * can be computed from
       * {@link android.graphics.ImageFormat#getBitsPerPixel(int)} / 8,
       * using the image format from {@link Camera.Parameters#getPreviewFormat()}.
       *
       * <p>This method is only necessary when the PictureCallbck for raw image
       * is used while calling {@link #takePicture(Camera.ShutterCallback,
       * Camera.PictureCallback, Camera.PictureCallback, Camera.PictureCallback)}.
       *
       * <p>Please note that by calling this method, the mode for
       * application-managed callback buffers is triggered. If this method has
       * never been called, null will be returned by the raw image callback since
       * there is no image callback buffer available. Furthermore, When a supplied
       * buffer is too small to hold the raw image data, raw image callback will
       * return null and the buffer will be removed from the buffer queue.
       *
       * @param callbackBuffer the buffer to add to the raw image callback buffer
       *     queue. The size should be width * height * (bits per pixel) / 8. An
       *     null callbackBuffer will be ignored and won't be added to the queue.
       *
       * @see #takePicture(Camera.ShutterCallback,
       * Camera.PictureCallback, Camera.PictureCallback, Camera.PictureCallback)}.
       *
       * {@hide}
       */
      @UnsupportedAppUsage
      public final void addRawImageCallbackBuffer(byte[] callbackBuffer)
      {
          addCallbackBuffer(callbackBuffer, CAMERA_MSG_RAW_IMAGE);
      }
  
      @UnsupportedAppUsage
      private final void addCallbackBuffer(byte[] callbackBuffer, int msgType)
      {
          // CAMERA_MSG_VIDEO_FRAME may be allowed in the future.
          if (msgType != CAMERA_MSG_PREVIEW_FRAME &&
              msgType != CAMERA_MSG_RAW_IMAGE) {
              throw new IllegalArgumentException(
                              "Unsupported message type: " + msgType);
          }
  
          _addCallbackBuffer(callbackBuffer, msgType);
      }
  
      private native final void _addCallbackBuffer(
                                  byte[] callbackBuffer, int msgType);
  
      /**
       * <p>Create a {@link android.renderscript RenderScript}
       * {@link android.renderscript.Allocation Allocation} to use as a
       * destination of preview callback frames. Use
       * {@link #setPreviewCallbackAllocation setPreviewCallbackAllocation} to use
       * the created Allocation as a destination for camera preview frames.</p>
       *
       * <p>The Allocation will be created with a YUV type, and its contents must
       * be accessed within Renderscript with the {@code rsGetElementAtYuv_*}
       * accessor methods. Its size will be based on the current
       * {@link Parameters#getPreviewSize preview size} configured for this
       * camera.</p>
       *
       * @param rs the RenderScript context for this Allocation.
       * @param usage additional usage flags to set for the Allocation. The usage
       *   flag {@link android.renderscript.Allocation#USAGE_IO_INPUT} will always
       *   be set on the created Allocation, but additional flags may be provided
       *   here.
       * @return a new YUV-type Allocation with dimensions equal to the current
       *   preview size.
       * @throws RSIllegalArgumentException if the usage flags are not compatible
       *   with an YUV Allocation.
       * @see #setPreviewCallbackAllocation
       * @hide
       */
      public final Allocation createPreviewAllocation(RenderScript rs, int usage)
              throws RSIllegalArgumentException {
          Parameters p = getParameters();
          Size previewSize = p.getPreviewSize();
          Type.Builder yuvBuilder = new Type.Builder(rs,
                  Element.createPixel(rs,
                          Element.DataType.UNSIGNED_8,
                          Element.DataKind.PIXEL_YUV));
          // Use YV12 for wide compatibility. Changing this requires also
          // adjusting camera service's format selection.
          yuvBuilder.setYuvFormat(ImageFormat.YV12);
          yuvBuilder.setX(previewSize.width);
          yuvBuilder.setY(previewSize.height);
  
          Allocation a = Allocation.createTyped(rs, yuvBuilder.create(),
                  usage | Allocation.USAGE_IO_INPUT);
  
          return a;
      }
  
      /**
       * <p>Set an {@link android.renderscript.Allocation Allocation} as the
       * target of preview callback data. Use this method for efficient processing
       * of camera preview data with RenderScript. The Allocation must be created
       * with the {@link #createPreviewAllocation createPreviewAllocation }
       * method.</p>
       *
       * <p>Setting a preview allocation will disable any active preview callbacks
       * set by {@link #setPreviewCallback setPreviewCallback} or
       * {@link #setPreviewCallbackWithBuffer setPreviewCallbackWithBuffer}, and
       * vice versa. Using a preview allocation still requires an active standard
       * preview target to be set, either with
       * {@link #setPreviewTexture setPreviewTexture} or
       * {@link #setPreviewDisplay setPreviewDisplay}.</p>
       *
       * <p>To be notified when new frames are available to the Allocation, use
       * {@link android.renderscript.Allocation#setIoInputNotificationHandler Allocation.setIoInputNotificationHandler}. To
       * update the frame currently accessible from the Allocation to the latest
       * preview frame, call
       * {@link android.renderscript.Allocation#ioReceive Allocation.ioReceive}.</p>
       *
       * <p>To disable preview into the Allocation, call this method with a
       * {@code null} parameter.</p>
       *
       * <p>Once a preview allocation is set, the preview size set by
       * {@link Parameters#setPreviewSize setPreviewSize} cannot be changed. If
       * you wish to change the preview size, first remove the preview allocation
       * by calling {@code setPreviewCallbackAllocation(null)}, then change the
       * preview size, create a new preview Allocation with
       * {@link #createPreviewAllocation createPreviewAllocation}, and set it as
       * the new preview callback allocation target.</p>
       *
       * <p>If you are using the preview data to create video or still images,
       * strongly consider using {@link android.media.MediaActionSound} to
       * properly indicate image capture or recording start/stop to the user.</p>
       *
       * @param previewAllocation the allocation to use as destination for preview
       * @throws IOException if configuring the camera to use the Allocation for
       *   preview fails.
       * @throws IllegalArgumentException if the Allocation's dimensions or other
       *   parameters don't meet the requirements.
       * @see #createPreviewAllocation
       * @see #setPreviewCallback
       * @see #setPreviewCallbackWithBuffer
       * @hide
       */
      public final void setPreviewCallbackAllocation(Allocation previewAllocation)
              throws IOException {
          Surface previewSurface = null;
          if (previewAllocation != null) {
               Parameters p = getParameters();
               Size previewSize = p.getPreviewSize();
               if (previewSize.width != previewAllocation.getType().getX() ||
                       previewSize.height != previewAllocation.getType().getY()) {
                   throw new IllegalArgumentException(
                       "Allocation dimensions don't match preview dimensions: " +
                       "Allocation is " +
                       previewAllocation.getType().getX() +
                       ", " +
                       previewAllocation.getType().getY() +
                       ". Preview is " + previewSize.width + ", " +
                       previewSize.height);
               }
               if ((previewAllocation.getUsage() &
                               Allocation.USAGE_IO_INPUT) == 0) {
                   throw new IllegalArgumentException(
                       "Allocation usage does not include USAGE_IO_INPUT");
               }
               if (previewAllocation.getType().getElement().getDataKind() !=
                       Element.DataKind.PIXEL_YUV) {
                   throw new IllegalArgumentException(
                       "Allocation is not of a YUV type");
               }
               previewSurface = previewAllocation.getSurface();
               mUsingPreviewAllocation = true;
           } else {
               mUsingPreviewAllocation = false;
           }
           setPreviewCallbackSurface(previewSurface);
      }
  
      private native final void setPreviewCallbackSurface(Surface s);
  
      private class EventHandler extends Handler
      {
          private final Camera mCamera;
  
          @UnsupportedAppUsage
          public EventHandler(Camera c, Looper looper) {
              super(looper);
              mCamera = c;
          }
  
          @Override
          public void handleMessage(Message msg) {
              switch(msg.what) {
              case CAMERA_MSG_SHUTTER:
                  if (mShutterCallback != null) {
                      mShutterCallback.onShutter();
                  }
                  return;
  
              case CAMERA_MSG_RAW_IMAGE:
                  if (mRawImageCallback != null) {
                      mRawImageCallback.onPictureTaken((byte[])msg.obj, mCamera);
                  }
                  return;
  
              case CAMERA_MSG_COMPRESSED_IMAGE:
                  if (mJpegCallback != null) {
                      mJpegCallback.onPictureTaken((byte[])msg.obj, mCamera);
                  }
                  return;
  
              case CAMERA_MSG_PREVIEW_FRAME:
                  PreviewCallback pCb = mPreviewCallback;
                  if (pCb != null) {
                      if (mOneShot) {
                          // Clear the callback variable before the callback
                          // in case the app calls setPreviewCallback from
                          // the callback function
                          mPreviewCallback = null;
                      } else if (!mWithBuffer) {
                          // We're faking the camera preview mode to prevent
                          // the app from being flooded with preview frames.
                          // Set to oneshot mode again.
                          setHasPreviewCallback(true, false);
                      }
                      pCb.onPreviewFrame((byte[])msg.obj, mCamera);
                  }
                  return;
  
              case CAMERA_MSG_POSTVIEW_FRAME:
                  if (mPostviewCallback != null) {
                      mPostviewCallback.onPictureTaken((byte[])msg.obj, mCamera);
                  }
                  return;
  
              case CAMERA_MSG_FOCUS:
                  AutoFocusCallback cb = null;
                  synchronized (mAutoFocusCallbackLock) {
                      cb = mAutoFocusCallback;
                  }
                  if (cb != null) {
                      boolean success = msg.arg1 == 0 ? false : true;
                      cb.onAutoFocus(success, mCamera);
                  }
                  return;
  
              case CAMERA_MSG_ZOOM:
                  if (mZoomListener != null) {
                      mZoomListener.onZoomChange(msg.arg1, msg.arg2 != 0, mCamera);
                  }
                  return;
  
              case CAMERA_MSG_PREVIEW_METADATA:
                  if (mFaceListener != null) {
                      mFaceListener.onFaceDetection((Face[])msg.obj, mCamera);
                  }
                  return;
  
              case CAMERA_MSG_ERROR :
                  Log.e(TAG, "Error " + msg.arg1);
                  if (mDetailedErrorCallback != null) {
                      mDetailedErrorCallback.onError(msg.arg1, mCamera);
                  } else if (mErrorCallback != null) {
                      if (msg.arg1 == CAMERA_ERROR_DISABLED) {
                          mErrorCallback.onError(CAMERA_ERROR_EVICTED, mCamera);
                      } else {
                          mErrorCallback.onError(msg.arg1, mCamera);
                      }
                  }
                  return;
  
              case CAMERA_MSG_FOCUS_MOVE:
                  if (mAutoFocusMoveCallback != null) {
                      mAutoFocusMoveCallback.onAutoFocusMoving(msg.arg1 == 0 ? false : true, mCamera);
                  }
                  return;
  
              default:
                  Log.e(TAG, "Unknown message type " + msg.what);
                  return;
              }
          }
      }
  
      @UnsupportedAppUsage
      private static void postEventFromNative(Object camera_ref,
                                              int what, int arg1, int arg2, Object obj)
      {
          Camera c = (Camera)((WeakReference)camera_ref).get();
          if (c == null)
              return;
  
          if (c.mEventHandler != null) {
              Message m = c.mEventHandler.obtainMessage(what, arg1, arg2, obj);
              c.mEventHandler.sendMessage(m);
          }
      }
  
      /**
       * Callback interface used to notify on completion of camera auto focus.
       *
       * <p>Devices that do not support auto-focus will receive a "fake"
       * callback to this interface. If your application needs auto-focus and
       * should not be installed on devices <em>without</em> auto-focus, you must
       * declare that your app uses the
       * {@code android.hardware.camera.autofocus} feature, in the
       * <a href="{@docRoot}guide/topics/manifest/uses-feature-element.html">&lt;uses-feature></a>
       * manifest element.</p>
       *
       * @see #autoFocus(AutoFocusCallback)
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public interface AutoFocusCallback
      {
          /**
           * Called when the camera auto focus completes.  If the camera
           * does not support auto-focus and autoFocus is called,
           * onAutoFocus will be called immediately with a fake value of
           * <code>success</code> set to <code>true</code>.
           *
           * The auto-focus routine does not lock auto-exposure and auto-white
           * balance after it completes.
           *
           * @param success true if focus was successful, false if otherwise
           * @param camera  the Camera service object
           * @see android.hardware.Camera.Parameters#setAutoExposureLock(boolean)
           * @see android.hardware.Camera.Parameters#setAutoWhiteBalanceLock(boolean)
           */
          void onAutoFocus(boolean success, Camera camera);
      }
  
      /**
       * Starts camera auto-focus and registers a callback function to run when
       * the camera is focused.  This method is only valid when preview is active
       * (between {@link #startPreview()} and before {@link #stopPreview()}).
       *
       * <p>Callers should check
       * {@link android.hardware.Camera.Parameters#getFocusMode()} to determine if
       * this method should be called. If the camera does not support auto-focus,
       * it is a no-op and {@link AutoFocusCallback#onAutoFocus(boolean, Camera)}
       * callback will be called immediately.
       *
       * <p>If your application should not be installed
       * on devices without auto-focus, you must declare that your application
       * uses auto-focus with the
       * <a href="{@docRoot}guide/topics/manifest/uses-feature-element.html">&lt;uses-feature></a>
       * manifest element.</p>
       *
       * <p>If the current flash mode is not
       * {@link android.hardware.Camera.Parameters#FLASH_MODE_OFF}, flash may be
       * fired during auto-focus, depending on the driver and camera hardware.<p>
       *
       * <p>Auto-exposure lock {@link android.hardware.Camera.Parameters#getAutoExposureLock()}
       * and auto-white balance locks {@link android.hardware.Camera.Parameters#getAutoWhiteBalanceLock()}
       * do not change during and after autofocus. But auto-focus routine may stop
       * auto-exposure and auto-white balance transiently during focusing.
       *
       * <p>Stopping preview with {@link #stopPreview()}, or triggering still
       * image capture with {@link #takePicture(Camera.ShutterCallback,
       * Camera.PictureCallback, Camera.PictureCallback)}, will not change the
       * the focus position. Applications must call cancelAutoFocus to reset the
       * focus.</p>
       *
       * <p>If autofocus is successful, consider using
       * {@link android.media.MediaActionSound} to properly play back an autofocus
       * success sound to the user.</p>
       *
       * @param cb the callback to run
       * @throws RuntimeException if starting autofocus fails; usually this would
       *    be because of a hardware or other low-level error, or because
       *    release() has been called on this Camera instance.
       * @see #cancelAutoFocus()
       * @see android.hardware.Camera.Parameters#setAutoExposureLock(boolean)
       * @see android.hardware.Camera.Parameters#setAutoWhiteBalanceLock(boolean)
       * @see android.media.MediaActionSound
       */
      public final void autoFocus(AutoFocusCallback cb)
      {
          synchronized (mAutoFocusCallbackLock) {
              mAutoFocusCallback = cb;
          }
          native_autoFocus();
      }
      private native final void native_autoFocus();
  
      /**
       * Cancels any auto-focus function in progress.
       * Whether or not auto-focus is currently in progress,
       * this function will return the focus position to the default.
       * If the camera does not support auto-focus, this is a no-op.
       *
       * @throws RuntimeException if canceling autofocus fails; usually this would
       *    be because of a hardware or other low-level error, or because
       *    release() has been called on this Camera instance.
       * @see #autoFocus(Camera.AutoFocusCallback)
       */
      public final void cancelAutoFocus()
      {
          synchronized (mAutoFocusCallbackLock) {
              mAutoFocusCallback = null;
          }
          native_cancelAutoFocus();
          // CAMERA_MSG_FOCUS should be removed here because the following
          // scenario can happen:
          // - An application uses the same thread for autoFocus, cancelAutoFocus
          //   and looper thread.
          // - The application calls autoFocus.
          // - HAL sends CAMERA_MSG_FOCUS, which enters the looper message queue.
          //   Before event handler's handleMessage() is invoked, the application
          //   calls cancelAutoFocus and autoFocus.
          // - The application gets the old CAMERA_MSG_FOCUS and thinks autofocus
          //   has been completed. But in fact it is not.
          //
          // As documented in the beginning of the file, apps should not use
          // multiple threads to call autoFocus and cancelAutoFocus at the same
          // time. It is HAL's responsibility not to send a CAMERA_MSG_FOCUS
          // message after native_cancelAutoFocus is called.
          mEventHandler.removeMessages(CAMERA_MSG_FOCUS);
      }
      private native final void native_cancelAutoFocus();
  
      /**
       * Callback interface used to notify on auto focus start and stop.
       *
       * <p>This is only supported in continuous autofocus modes -- {@link
       * Parameters#FOCUS_MODE_CONTINUOUS_VIDEO} and {@link
       * Parameters#FOCUS_MODE_CONTINUOUS_PICTURE}. Applications can show
       * autofocus animation based on this.</p>
       *
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public interface AutoFocusMoveCallback
      {
          /**
           * Called when the camera auto focus starts or stops.
           *
           * @param start true if focus starts to move, false if focus stops to move
           * @param camera the Camera service object
           */
          void onAutoFocusMoving(boolean start, Camera camera);
      }
  
      /**
       * Sets camera auto-focus move callback.
       *
       * @param cb the callback to run
       * @throws RuntimeException if enabling the focus move callback fails;
       *    usually this would be because of a hardware or other low-level error,
       *    or because release() has been called on this Camera instance.
       */
      public void setAutoFocusMoveCallback(AutoFocusMoveCallback cb) {
          mAutoFocusMoveCallback = cb;
          enableFocusMoveCallback((mAutoFocusMoveCallback != null) ? 1 : 0);
      }
  
      private native void enableFocusMoveCallback(int enable);
  
      /**
       * Callback interface used to signal the moment of actual image capture.
       *
       * @see #takePicture(ShutterCallback, PictureCallback, PictureCallback, PictureCallback)
       *
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public interface ShutterCallback
      {
          /**
           * Called as near as possible to the moment when a photo is captured
           * from the sensor.  This is a good opportunity to play a shutter sound
           * or give other feedback of camera operation.  This may be some time
           * after the photo was triggered, but some time before the actual data
           * is available.
           */
          void onShutter();
      }
  
      /**
       * Callback interface used to supply image data from a photo capture.
       *
       * @see #takePicture(ShutterCallback, PictureCallback, PictureCallback, PictureCallback)
       *
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public interface PictureCallback {
          /**
           * Called when image data is available after a picture is taken.
           * The format of the data depends on the context of the callback
           * and {@link Camera.Parameters} settings.
           *
           * @param data   a byte array of the picture data
           * @param camera the Camera service object
           */
          void onPictureTaken(byte[] data, Camera camera);
      };
  
      /**
       * Equivalent to <pre>takePicture(Shutter, raw, null, jpeg)</pre>.
       *
       * @see #takePicture(ShutterCallback, PictureCallback, PictureCallback, PictureCallback)
       */
      public final void takePicture(ShutterCallback shutter, PictureCallback raw,
              PictureCallback jpeg) {
          takePicture(shutter, raw, null, jpeg);
      }
      private native final void native_takePicture(int msgType);
  
      /**
       * Triggers an asynchronous image capture. The camera service will initiate
       * a series of callbacks to the application as the image capture progresses.
       * The shutter callback occurs after the image is captured. This can be used
       * to trigger a sound to let the user know that image has been captured. The
       * raw callback occurs when the raw image data is available (NOTE: the data
       * will be null if there is no raw image callback buffer available or the
       * raw image callback buffer is not large enough to hold the raw image).
       * The postview callback occurs when a scaled, fully processed postview
       * image is available (NOTE: not all hardware supports this). The jpeg
       * callback occurs when the compressed image is available. If the
       * application does not need a particular callback, a null can be passed
       * instead of a callback method.
       *
       * <p>This method is only valid when preview is active (after
       * {@link #startPreview()}).  Preview will be stopped after the image is
       * taken; callers must call {@link #startPreview()} again if they want to
       * re-start preview or take more pictures. This should not be called between
       * {@link android.media.MediaRecorder#start()} and
       * {@link android.media.MediaRecorder#stop()}.
       *
       * <p>After calling this method, you must not call {@link #startPreview()}
       * or take another picture until the JPEG callback has returned.
       *
       * @param shutter   the callback for image capture moment, or null
       * @param raw       the callback for raw (uncompressed) image data, or null
       * @param postview  callback with postview image data, may be null
       * @param jpeg      the callback for JPEG image data, or null
       * @throws RuntimeException if starting picture capture fails; usually this
       *    would be because of a hardware or other low-level error, or because
       *    release() has been called on this Camera instance.
       */
      public final void takePicture(ShutterCallback shutter, PictureCallback raw,
              PictureCallback postview, PictureCallback jpeg) {
          mShutterCallback = shutter;
          mRawImageCallback = raw;
          mPostviewCallback = postview;
          mJpegCallback = jpeg;
  
          // If callback is not set, do not send me callbacks.
          int msgType = 0;
          if (mShutterCallback != null) {
              msgType |= CAMERA_MSG_SHUTTER;
          }
          if (mRawImageCallback != null) {
              msgType |= CAMERA_MSG_RAW_IMAGE;
          }
          if (mPostviewCallback != null) {
              msgType |= CAMERA_MSG_POSTVIEW_FRAME;
          }
          if (mJpegCallback != null) {
              msgType |= CAMERA_MSG_COMPRESSED_IMAGE;
          }
  
          native_takePicture(msgType);
          mFaceDetectionRunning = false;
      }
  
      /**
       * Zooms to the requested value smoothly. The driver will notify {@link
       * OnZoomChangeListener} of the zoom value and whether zoom is stopped at
       * the time. For example, suppose the current zoom is 0 and startSmoothZoom
       * is called with value 3. The
       * {@link Camera.OnZoomChangeListener#onZoomChange(int, boolean, Camera)}
       * method will be called three times with zoom values 1, 2, and 3.
       * Applications can call {@link #stopSmoothZoom} to stop the zoom earlier.
       * Applications should not call startSmoothZoom again or change the zoom
       * value before zoom stops. If the supplied zoom value equals to the current
       * zoom value, no zoom callback will be generated. This method is supported
       * if {@link android.hardware.Camera.Parameters#isSmoothZoomSupported}
       * returns true.
       *
       * @param value zoom value. The valid range is 0 to {@link
       *              android.hardware.Camera.Parameters#getMaxZoom}.
       * @throws IllegalArgumentException if the zoom value is invalid.
       * @throws RuntimeException if the method fails.
       * @see #setZoomChangeListener(OnZoomChangeListener)
       */
      public native final void startSmoothZoom(int value);
  
      /**
       * Stops the smooth zoom. Applications should wait for the {@link
       * OnZoomChangeListener} to know when the zoom is actually stopped. This
       * method is supported if {@link
       * android.hardware.Camera.Parameters#isSmoothZoomSupported} is true.
       *
       * @throws RuntimeException if the method fails.
       */
      public native final void stopSmoothZoom();
  
      /**
       * Set the clockwise rotation of preview display in degrees. This affects
       * the preview frames and the picture displayed after snapshot. This method
       * is useful for portrait mode applications. Note that preview display of
       * front-facing cameras is flipped horizontally before the rotation, that
       * is, the image is reflected along the central vertical axis of the camera
       * sensor. So the users can see themselves as looking into a mirror.
       *
       * <p>This does not affect the order of byte array passed in {@link
       * PreviewCallback#onPreviewFrame}, JPEG pictures, or recorded videos. This
       * method is not allowed to be called during preview.
       *
       * <p>If you want to make the camera image show in the same orientation as
       * the display, you can use the following code.
       * <pre>
       * public static void setCameraDisplayOrientation(Activity activity,
       *         int cameraId, android.hardware.Camera camera) {
       *     android.hardware.Camera.CameraInfo info =
       *             new android.hardware.Camera.CameraInfo();
       *     android.hardware.Camera.getCameraInfo(cameraId, info);
       *     int rotation = activity.getWindowManager().getDefaultDisplay()
       *             .getRotation();
       *     int degrees = 0;
       *     switch (rotation) {
       *         case Surface.ROTATION_0: degrees = 0; break;
       *         case Surface.ROTATION_90: degrees = 90; break;
       *         case Surface.ROTATION_180: degrees = 180; break;
       *         case Surface.ROTATION_270: degrees = 270; break;
       *     }
       *
       *     int result;
       *     if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
       *         result = (info.orientation + degrees) % 360;
       *         result = (360 - result) % 360;  // compensate the mirror
       *     } else {  // back-facing
       *         result = (info.orientation - degrees + 360) % 360;
       *     }
       *     camera.setDisplayOrientation(result);
       * }
       * </pre>
       *
       * <p>Starting from API level 14, this method can be called when preview is
       * active.
       *
       * <p><b>Note: </b>Before API level 24, the default value for orientation is 0. Starting in
       * API level 24, the default orientation will be such that applications in forced-landscape mode
       * will have correct preview orientation, which may be either a default of 0 or
       * 180. Applications that operate in portrait mode or allow for changing orientation must still
       * call this method after each orientation change to ensure correct preview display in all
       * cases.</p>
       *
       * @param degrees the angle that the picture will be rotated clockwise.
       *                Valid values are 0, 90, 180, and 270.
       * @throws RuntimeException if setting orientation fails; usually this would
       *    be because of a hardware or other low-level error, or because
       *    release() has been called on this Camera instance.
       * @see #setPreviewDisplay(SurfaceHolder)
       */
      public native final void setDisplayOrientation(int degrees);
  
      /**
       * <p>Enable or disable the default shutter sound when taking a picture.</p>
       *
       * <p>By default, the camera plays the system-defined camera shutter sound
       * when {@link #takePicture} is called. Using this method, the shutter sound
       * can be disabled. It is strongly recommended that an alternative shutter
       * sound is played in the {@link ShutterCallback} when the system shutter
       * sound is disabled.</p>
       *
       * <p>Note that devices may not always allow disabling the camera shutter
       * sound. If the shutter sound state cannot be set to the desired value,
       * this method will return false. {@link CameraInfo#canDisableShutterSound}
       * can be used to determine whether the device will allow the shutter sound
       * to be disabled.</p>
       *
       * @param enabled whether the camera should play the system shutter sound
       *                when {@link #takePicture takePicture} is called.
       * @return {@code true} if the shutter sound state was successfully
       *         changed. {@code false} if the shutter sound state could not be
       *         changed. {@code true} is also returned if shutter sound playback
       *         is already set to the requested state.
       * @throws RuntimeException if the call fails; usually this would be because
       *    of a hardware or other low-level error, or because release() has been
       *    called on this Camera instance.
       * @see #takePicture
       * @see CameraInfo#canDisableShutterSound
       * @see ShutterCallback
       */
      public final boolean enableShutterSound(boolean enabled) {
          boolean canDisableShutterSound = true;
          IBinder b = ServiceManager.getService(Context.AUDIO_SERVICE);
          IAudioService audioService = IAudioService.Stub.asInterface(b);
          try {
              if (audioService.isCameraSoundForced()) {
                  canDisableShutterSound = false;
              }
          } catch (RemoteException e) {
              Log.e(TAG, "Audio service is unavailable for queries");
          }
          if (!enabled && !canDisableShutterSound) {
              return false;
          }
          synchronized (mShutterSoundLock) {
              mShutterSoundEnabledFromApp = enabled;
              // Return the result of _enableShutterSound(enabled) in all cases.
              // If the shutter sound can be disabled, disable it when the device is in DnD mode.
              boolean ret = _enableShutterSound(enabled);
              if (enabled && !mHasAppOpsPlayAudio) {
                  Log.i(TAG, "Shutter sound is not allowed by AppOpsManager");
                  if (canDisableShutterSound) {
                      _enableShutterSound(false);
                  }
              }
              return ret;
          }
      }
  
      /**
       * Disable the shutter sound unconditionally.
       *
       * <p>
       * This is only guaranteed to work for legacy cameras
       * (i.e. initialized with {@link #cameraInitUnspecified}). Trying to call this on
       * a regular camera will force a conditional check in the camera service.
       * </p>
       *
       * @return {@code true} if the shutter sound state was successfully
       *         changed. {@code false} if the shutter sound state could not be
       *         changed. {@code true} is also returned if shutter sound playback
       *         is already set to the requested state.
       *
       * @hide
       */
      public final boolean disableShutterSound() {
          return _enableShutterSound(/*enabled*/false);
      }
  
      private native final boolean _enableShutterSound(boolean enabled);
  
      private static class IAppOpsCallbackWrapper extends IAppOpsCallback.Stub {
          private final WeakReference<Camera> mWeakCamera;
  
          IAppOpsCallbackWrapper(Camera camera) {
              mWeakCamera = new WeakReference<Camera>(camera);
          }
  
          @Override
          public void opChanged(int op, int uid, String packageName) {
              if (op == AppOpsManager.OP_PLAY_AUDIO) {
                  final Camera camera = mWeakCamera.get();
                  if (camera != null) {
                      camera.updateAppOpsPlayAudio();
                  }
              }
          }
      }
  
      private void updateAppOpsPlayAudio() {
          synchronized (mShutterSoundLock) {
              boolean oldHasAppOpsPlayAudio = mHasAppOpsPlayAudio;
              try {
                  int mode = AppOpsManager.MODE_IGNORED;
                  if (mAppOps != null) {
                      mode = mAppOps.checkAudioOperation(AppOpsManager.OP_PLAY_AUDIO,
                              AudioAttributes.USAGE_ASSISTANCE_SONIFICATION,
                              Process.myUid(), ActivityThread.currentPackageName());
                  }
                  mHasAppOpsPlayAudio = mode == AppOpsManager.MODE_ALLOWED;
              } catch (RemoteException e) {
                  Log.e(TAG, "AppOpsService check audio operation failed");
                  mHasAppOpsPlayAudio = false;
              }
              if (oldHasAppOpsPlayAudio != mHasAppOpsPlayAudio) {
                  if (!mHasAppOpsPlayAudio) {
                      IBinder b = ServiceManager.getService(Context.AUDIO_SERVICE);
                      IAudioService audioService = IAudioService.Stub.asInterface(b);
                      try {
                          if (audioService.isCameraSoundForced()) {
                              return;
                          }
                      } catch (RemoteException e) {
                          Log.e(TAG, "Audio service is unavailable for queries");
                      }
                      _enableShutterSound(false);
                  } else {
                      enableShutterSound(mShutterSoundEnabledFromApp);
                  }
              }
          }
      }
  
      /**
       * Callback interface for zoom changes during a smooth zoom operation.
       *
       * @see #setZoomChangeListener(OnZoomChangeListener)
       * @see #startSmoothZoom(int)
       *
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public interface OnZoomChangeListener
      {
          /**
           * Called when the zoom value has changed during a smooth zoom.
           *
           * @param zoomValue the current zoom value. In smooth zoom mode, camera
           *                  calls this for every new zoom value.
           * @param stopped whether smooth zoom is stopped. If the value is true,
           *                this is the last zoom update for the application.
           * @param camera  the Camera service object
           */
          void onZoomChange(int zoomValue, boolean stopped, Camera camera);
      };
  
      /**
       * Registers a listener to be notified when the zoom value is updated by the
       * camera driver during smooth zoom.
       *
       * @param listener the listener to notify
       * @see #startSmoothZoom(int)
       */
      public final void setZoomChangeListener(OnZoomChangeListener listener)
      {
          mZoomListener = listener;
      }
  
      /**
       * Callback interface for face detected in the preview frame.
       *
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public interface FaceDetectionListener
      {
          /**
           * Notify the listener of the detected faces in the preview frame.
           *
           * @param faces The detected faces in a list
           * @param camera  The {@link Camera} service object
           */
          void onFaceDetection(Face[] faces, Camera camera);
      }
  
      /**
       * Registers a listener to be notified about the faces detected in the
       * preview frame.
       *
       * @param listener the listener to notify
       * @see #startFaceDetection()
       */
      public final void setFaceDetectionListener(FaceDetectionListener listener)
      {
          mFaceListener = listener;
      }
  
      /**
       * Starts the face detection. This should be called after preview is started.
       * The camera will notify {@link FaceDetectionListener} of the detected
       * faces in the preview frame. The detected faces may be the same as the
       * previous ones. Applications should call {@link #stopFaceDetection} to
       * stop the face detection. This method is supported if {@link
       * Parameters#getMaxNumDetectedFaces()} returns a number larger than 0.
       * If the face detection has started, apps should not call this again.
       *
       * <p>When the face detection is running, {@link Parameters#setWhiteBalance(String)},
       * {@link Parameters#setFocusAreas(List)}, and {@link Parameters#setMeteringAreas(List)}
       * have no effect. The camera uses the detected faces to do auto-white balance,
       * auto exposure, and autofocus.
       *
       * <p>If the apps call {@link #autoFocus(AutoFocusCallback)}, the camera
       * will stop sending face callbacks. The last face callback indicates the
       * areas used to do autofocus. After focus completes, face detection will
       * resume sending face callbacks. If the apps call {@link
       * #cancelAutoFocus()}, the face callbacks will also resume.</p>
       *
       * <p>After calling {@link #takePicture(Camera.ShutterCallback, Camera.PictureCallback,
       * Camera.PictureCallback)} or {@link #stopPreview()}, and then resuming
       * preview with {@link #startPreview()}, the apps should call this method
       * again to resume face detection.</p>
       *
       * @throws IllegalArgumentException if the face detection is unsupported.
       * @throws RuntimeException if the method fails or the face detection is
       *         already running.
       * @see FaceDetectionListener
       * @see #stopFaceDetection()
       * @see Parameters#getMaxNumDetectedFaces()
       */
      public final void startFaceDetection() {
          if (mFaceDetectionRunning) {
              throw new RuntimeException("Face detection is already running");
          }
          _startFaceDetection(CAMERA_FACE_DETECTION_HW);
          mFaceDetectionRunning = true;
      }
  
      /**
       * Stops the face detection.
       *
       * @see #startFaceDetection()
       */
      public final void stopFaceDetection() {
          _stopFaceDetection();
          mFaceDetectionRunning = false;
      }
  
      private native final void _startFaceDetection(int type);
      private native final void _stopFaceDetection();
  
      /**
       * Information about a face identified through camera face detection.
       *
       * <p>When face detection is used with a camera, the {@link FaceDetectionListener} returns a
       * list of face objects for use in focusing and metering.</p>
       *
       * @see FaceDetectionListener
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public static class Face {
          /**
           * Create an empty face.
           */
          public Face() {
          }
  
          /**
           * Bounds of the face. (-1000, -1000) represents the top-left of the
           * camera field of view, and (1000, 1000) represents the bottom-right of
           * the field of view. For example, suppose the size of the viewfinder UI
           * is 800x480. The rect passed from the driver is (-1000, -1000, 0, 0).
           * The corresponding viewfinder rect should be (0, 0, 400, 240). It is
           * guaranteed left < right and top < bottom. The coordinates can be
           * smaller than -1000 or bigger than 1000. But at least one vertex will
           * be within (-1000, -1000) and (1000, 1000).
           *
           * <p>The direction is relative to the sensor orientation, that is, what
           * the sensor sees. The direction is not affected by the rotation or
           * mirroring of {@link #setDisplayOrientation(int)}. The face bounding
           * rectangle does not provide any information about face orientation.</p>
           *
           * <p>Here is the matrix to convert driver coordinates to View coordinates
           * in pixels.</p>
           * <pre>
           * Matrix matrix = new Matrix();
           * CameraInfo info = CameraHolder.instance().getCameraInfo()[cameraId];
           * // Need mirror for front camera.
           * boolean mirror = (info.facing == CameraInfo.CAMERA_FACING_FRONT);
           * matrix.setScale(mirror ? -1 : 1, 1);
           * // This is the value for android.hardware.Camera.setDisplayOrientation.
           * matrix.postRotate(displayOrientation);
           * // Camera driver coordinates range from (-1000, -1000) to (1000, 1000).
           * // UI coordinates range from (0, 0) to (width, height).
           * matrix.postScale(view.getWidth() / 2000f, view.getHeight() / 2000f);
           * matrix.postTranslate(view.getWidth() / 2f, view.getHeight() / 2f);
           * </pre>
           *
           * @see #startFaceDetection()
           */
          public Rect rect;
  
          /**
           * <p>The confidence level for the detection of the face. The range is 1 to
           * 100. 100 is the highest confidence.</p>
           *
           * <p>Depending on the device, even very low-confidence faces may be
           * listed, so applications should filter out faces with low confidence,
           * depending on the use case. For a typical point-and-shoot camera
           * application that wishes to display rectangles around detected faces,
           * filtering out faces with confidence less than 50 is recommended.</p>
           *
           * @see #startFaceDetection()
           */
          public int score;
  
          /**
           * An unique id per face while the face is visible to the tracker. If
           * the face leaves the field-of-view and comes back, it will get a new
           * id. This is an optional field, may not be supported on all devices.
           * If not supported, id will always be set to -1. The optional fields
           * are supported as a set. Either they are all valid, or none of them
           * are.
           */
          public int id = -1;
  
          /**
           * The coordinates of the center of the left eye. The coordinates are in
           * the same space as the ones for {@link #rect}. This is an optional
           * field, may not be supported on all devices. If not supported, the
           * value will always be set to null. The optional fields are supported
           * as a set. Either they are all valid, or none of them are.
           */
          public Point leftEye = null;
  
          /**
           * The coordinates of the center of the right eye. The coordinates are
           * in the same space as the ones for {@link #rect}.This is an optional
           * field, may not be supported on all devices. If not supported, the
           * value will always be set to null. The optional fields are supported
           * as a set. Either they are all valid, or none of them are.
           */
          public Point rightEye = null;
  
          /**
           * The coordinates of the center of the mouth.  The coordinates are in
           * the same space as the ones for {@link #rect}. This is an optional
           * field, may not be supported on all devices. If not supported, the
           * value will always be set to null. The optional fields are supported
           * as a set. Either they are all valid, or none of them are.
           */
          public Point mouth = null;
      }
  
      /**
       * Unspecified camera error.
       * @see Camera.ErrorCallback
       */
      public static final int CAMERA_ERROR_UNKNOWN = 1;
  
      /**
       * Camera was disconnected due to use by higher priority user.
       * @see Camera.ErrorCallback
       */
      public static final int CAMERA_ERROR_EVICTED = 2;
  
      /**
       * Camera was disconnected due to device policy change or client
       * application going to background.
       * @see Camera.ErrorCallback
       *
       * @hide
       */
      public static final int CAMERA_ERROR_DISABLED = 3;
  
      /**
       * Media server died. In this case, the application must release the
       * Camera object and instantiate a new one.
       * @see Camera.ErrorCallback
       */
      public static final int CAMERA_ERROR_SERVER_DIED = 100;
  
      /**
       * Callback interface for camera error notification.
       *
       * @see #setErrorCallback(ErrorCallback)
       *
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public interface ErrorCallback
      {
          /**
           * Callback for camera errors.
           * @param error   error code:
           * <ul>
           * <li>{@link #CAMERA_ERROR_UNKNOWN}
           * <li>{@link #CAMERA_ERROR_SERVER_DIED}
           * </ul>
           * @param camera  the Camera service object
           */
          void onError(int error, Camera camera);
      };
  
      /**
       * Registers a callback to be invoked when an error occurs.
       * @param cb The callback to run
       */
      public final void setErrorCallback(ErrorCallback cb)
      {
          mErrorCallback = cb;
      }
  
      /**
       * Registers a callback to be invoked when an error occurs.
       * The detailed error callback may contain error code that
       * gives more detailed information about the error.
       *
       * When a detailed callback is set, the callback set via
       * #setErrorCallback(ErrorCallback) will stop receiving
       * onError call.
       *
       * @param cb The callback to run
       *
       * @hide
       */
      public final void setDetailedErrorCallback(ErrorCallback cb)
      {
          mDetailedErrorCallback = cb;
      }
  
      @UnsupportedAppUsage
      private native final void native_setParameters(String params);
      @UnsupportedAppUsage
      private native final String native_getParameters();
  
      /**
       * Changes the settings for this Camera service.
       *
       * @param params the Parameters to use for this Camera service
       * @throws RuntimeException if any parameter is invalid or not supported.
       * @see #getParameters()
       */
      public void setParameters(Parameters params) {
          // If using preview allocations, don't allow preview size changes
          if (mUsingPreviewAllocation) {
              Size newPreviewSize = params.getPreviewSize();
              Size currentPreviewSize = getParameters().getPreviewSize();
              if (newPreviewSize.width != currentPreviewSize.width ||
                      newPreviewSize.height != currentPreviewSize.height) {
                  throw new IllegalStateException("Cannot change preview size" +
                          " while a preview allocation is configured.");
              }
          }
  
          native_setParameters(params.flatten());
      }
  
      /**
       * Returns the current settings for this Camera service.
       * If modifications are made to the returned Parameters, they must be passed
       * to {@link #setParameters(Camera.Parameters)} to take effect.
       *
       * @throws RuntimeException if reading parameters fails; usually this would
       *    be because of a hardware or other low-level error, or because
       *    release() has been called on this Camera instance.
       * @see #setParameters(Camera.Parameters)
       */
      public Parameters getParameters() {
          Parameters p = new Parameters();
          String s = native_getParameters();
          p.unflatten(s);
          return p;
      }
  
      /**
       * Returns an empty {@link Parameters} for testing purpose.
       *
       * @return a Parameter object.
       *
       * @hide
       */
      @UnsupportedAppUsage
      public static Parameters getEmptyParameters() {
          Camera camera = new Camera();
          return camera.new Parameters();
      }
  
      /**
       * Returns a copied {@link Parameters}; for shim use only.
       *
       * @param parameters a non-{@code null} parameters
       * @return a Parameter object, with all the parameters copied from {@code parameters}.
       *
       * @throws NullPointerException if {@code parameters} was {@code null}
       * @hide
       */
      public static Parameters getParametersCopy(Camera.Parameters parameters) {
          if (parameters == null) {
              throw new NullPointerException("parameters must not be null");
          }
  
          Camera camera = parameters.getOuter();
          Parameters p = camera.new Parameters();
          p.copyFrom(parameters);
  
          return p;
      }
  
      /**
       * Image size (width and height dimensions).
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public class Size {
          /**
           * Sets the dimensions for pictures.
           *
           * @param w the photo width (pixels)
           * @param h the photo height (pixels)
           */
          public Size(int w, int h) {
              width = w;
              height = h;
          }
          /**
           * Compares {@code obj} to this size.
           *
           * @param obj the object to compare this size with.
           * @return {@code true} if the width and height of {@code obj} is the
           *         same as those of this size. {@code false} otherwise.
           */
          @Override
          public boolean equals(Object obj) {
              if (!(obj instanceof Size)) {
                  return false;
              }
              Size s = (Size) obj;
              return width == s.width && height == s.height;
          }
          @Override
          public int hashCode() {
              return width * 32713 + height;
          }
          /** width of the picture */
          public int width;
          /** height of the picture */
          public int height;
      };
  
      /**
       * <p>The Area class is used for choosing specific metering and focus areas for
       * the camera to use when calculating auto-exposure, auto-white balance, and
       * auto-focus.</p>
       *
       * <p>To find out how many simultaneous areas a given camera supports, use
       * {@link Parameters#getMaxNumMeteringAreas()} and
       * {@link Parameters#getMaxNumFocusAreas()}. If metering or focusing area
       * selection is unsupported, these methods will return 0.</p>
       *
       * <p>Each Area consists of a rectangle specifying its bounds, and a weight
       * that determines its importance. The bounds are relative to the camera's
       * current field of view. The coordinates are mapped so that (-1000, -1000)
       * is always the top-left corner of the current field of view, and (1000,
       * 1000) is always the bottom-right corner of the current field of
       * view. Setting Areas with bounds outside that range is not allowed. Areas
       * with zero or negative width or height are not allowed.</p>
       *
       * <p>The weight must range from 1 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 overlap and the driver
       * will add the weights in the overlap region.</p>
       *
       * @see Parameters#setFocusAreas(List)
       * @see Parameters#getFocusAreas()
       * @see Parameters#getMaxNumFocusAreas()
       * @see Parameters#setMeteringAreas(List)
       * @see Parameters#getMeteringAreas()
       * @see Parameters#getMaxNumMeteringAreas()
       *
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public static class Area {
          /**
           * Create an area with specified rectangle and weight.
           *
           * @param rect the bounds of the area.
           * @param weight the weight of the area.
           */
          public Area(Rect rect, int weight) {
              this.rect = rect;
              this.weight = weight;
          }
          /**
           * Compares {@code obj} to this area.
           *
           * @param obj the object to compare this area with.
           * @return {@code true} if the rectangle and weight of {@code obj} is
           *         the same as those of this area. {@code false} otherwise.
           */
          @Override
          public boolean equals(Object obj) {
              if (!(obj instanceof Area)) {
                  return false;
              }
              Area a = (Area) obj;
              if (rect == null) {
                  if (a.rect != null) return false;
              } else {
                  if (!rect.equals(a.rect)) return false;
              }
              return weight == a.weight;
          }
  
          /**
           * Bounds of the area. (-1000, -1000) represents the top-left of the
           * camera field of view, and (1000, 1000) represents the bottom-right of
           * the field of view. Setting bounds outside that range is not
           * allowed. Bounds with zero or negative width or height are not
           * allowed.
           *
           * @see Parameters#getFocusAreas()
           * @see Parameters#getMeteringAreas()
           */
          public Rect rect;
  
          /**
           * Weight of the area. The weight must range from 1 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 overlap and
           * the driver will add the weights in the overlap region.
           *
           * @see Parameters#getFocusAreas()
           * @see Parameters#getMeteringAreas()
           */
          public int weight;
      }
  
      /**
       * Camera service settings.
       *
       * <p>To make camera parameters take effect, applications have to call
       * {@link Camera#setParameters(Camera.Parameters)}. For example, after
       * {@link Camera.Parameters#setWhiteBalance} is called, white balance is not
       * actually changed until {@link Camera#setParameters(Camera.Parameters)}
       * is called with the changed parameters object.
       *
       * <p>Different devices may have different camera capabilities, such as
       * picture size or flash modes. The application should query the camera
       * capabilities before setting parameters. For example, the application
       * should call {@link Camera.Parameters#getSupportedColorEffects()} before
       * calling {@link Camera.Parameters#setColorEffect(String)}. If the
       * camera does not support color effects,
       * {@link Camera.Parameters#getSupportedColorEffects()} will return null.
       *
       * @deprecated We recommend using the new {@link android.hardware.camera2} API for new
       *             applications.
       */
      @Deprecated
      public class Parameters {
          // Parameter keys to communicate with the camera driver.
          private static final String KEY_PREVIEW_SIZE = "preview-size";
          private static final String KEY_PREVIEW_FORMAT = "preview-format";
          private static final String KEY_PREVIEW_FRAME_RATE = "preview-frame-rate";
          private static final String KEY_PREVIEW_FPS_RANGE = "preview-fps-range";
          private static final String KEY_PICTURE_SIZE = "picture-size";
          private static final String KEY_PICTURE_FORMAT = "picture-format";
          private static final String KEY_JPEG_THUMBNAIL_SIZE = "jpeg-thumbnail-size";
          private static final String KEY_JPEG_THUMBNAIL_WIDTH = "jpeg-thumbnail-width";
          private static final String KEY_JPEG_THUMBNAIL_HEIGHT = "jpeg-thumbnail-height";
          private static final String KEY_JPEG_THUMBNAIL_QUALITY = "jpeg-thumbnail-quality";
          private static final String KEY_JPEG_QUALITY = "jpeg-quality";
          private static final String KEY_ROTATION = "rotation";
          private static final String KEY_GPS_LATITUDE = "gps-latitude";
          private static final String KEY_GPS_LONGITUDE = "gps-longitude";
          private static final String KEY_GPS_ALTITUDE = "gps-altitude";
          private static final String KEY_GPS_TIMESTAMP = "gps-timestamp";
          private static final String KEY_GPS_PROCESSING_METHOD = "gps-processing-method";
          private static final String KEY_WHITE_BALANCE = "whitebalance";
          private static final String KEY_EFFECT = "effect";
          private static final String KEY_ANTIBANDING = "antibanding";
          private static final String KEY_SCENE_MODE = "scene-mode";
          private static final String KEY_FLASH_MODE = "flash-mode";
          private static final String KEY_FOCUS_MODE = "focus-mode";
          private static final String KEY_FOCUS_AREAS = "focus-areas";
          private static final String KEY_MAX_NUM_FOCUS_AREAS = "max-num-focus-areas";
          private static final String KEY_FOCAL_LENGTH = "focal-length";
          private static final String KEY_HORIZONTAL_VIEW_ANGLE = "horizontal-view-angle";
          private static final String KEY_VERTICAL_VIEW_ANGLE = "vertical-view-angle";
          private static final String KEY_EXPOSURE_COMPENSATION = "exposure-compensation";
          private static final String KEY_MAX_EXPOSURE_COMPENSATION = "max-exposure-compensation";
          private static final String KEY_MIN_EXPOSURE_COMPENSATION = "min-exposure-compensation";
          private static final String KEY_EXPOSURE_COMPENSATION_STEP = "exposure-compensation-step";
          private static final String KEY_AUTO_EXPOSURE_LOCK = "auto-exposure-lock";
          private static final String KEY_AUTO_EXPOSURE_LOCK_SUPPORTED = "auto-exposure-lock-supported";
          private static final String KEY_AUTO_WHITEBALANCE_LOCK = "auto-whitebalance-lock";
          private static final String KEY_AUTO_WHITEBALANCE_LOCK_SUPPORTED = "auto-whitebalance-lock-supported";
          private static final String KEY_METERING_AREAS = "metering-areas";
          private static final String KEY_MAX_NUM_METERING_AREAS = "max-num-metering-areas";
          private static final String KEY_ZOOM = "zoom";
          private static final String KEY_MAX_ZOOM = "max-zoom";
          private static final String KEY_ZOOM_RATIOS = "zoom-ratios";
          private static final String KEY_ZOOM_SUPPORTED = "zoom-supported";
          private static final String KEY_SMOOTH_ZOOM_SUPPORTED = "smooth-zoom-supported";
          private static final String KEY_FOCUS_DISTANCES = "focus-distances";
          private static final String KEY_VIDEO_SIZE = "video-size";
          private static final String KEY_PREFERRED_PREVIEW_SIZE_FOR_VIDEO =
                                              "preferred-preview-size-for-video";
          private static final String KEY_MAX_NUM_DETECTED_FACES_HW = "max-num-detected-faces-hw";
          private static final String KEY_MAX_NUM_DETECTED_FACES_SW = "max-num-detected-faces-sw";
          private static final String KEY_RECORDING_HINT = "recording-hint";
          private static final String KEY_VIDEO_SNAPSHOT_SUPPORTED = "video-snapshot-supported";
          private static final String KEY_VIDEO_STABILIZATION = "video-stabilization";
          private static final String KEY_VIDEO_STABILIZATION_SUPPORTED = "video-stabilization-supported";
  
          // Parameter key suffix for supported values.
          private static final String SUPPORTED_VALUES_SUFFIX = "-values";
  
          private static final String TRUE = "true";
          private static final String FALSE = "false";
  
          // Values for white balance settings.
          public static final String WHITE_BALANCE_AUTO = "auto";
          public static final String WHITE_BALANCE_INCANDESCENT = "incandescent";
          public static final String WHITE_BALANCE_FLUORESCENT = "fluorescent";
          public static final String WHITE_BALANCE_WARM_FLUORESCENT = "warm-fluorescent";
          public static final String WHITE_BALANCE_DAYLIGHT = "daylight";
          public static final String WHITE_BALANCE_CLOUDY_DAYLIGHT = "cloudy-daylight";
          public static final String WHITE_BALANCE_TWILIGHT = "twilight";
          public static final String WHITE_BALANCE_SHADE = "shade";
  
          // Values for color effect settings.
          public static final String EFFECT_NONE = "none";
          public static final String EFFECT_MONO = "mono";
          public static final String EFFECT_NEGATIVE = "negative";
          public static final String EFFECT_SOLARIZE = "solarize";
          public static final String EFFECT_SEPIA = "sepia";
          public static final String EFFECT_POSTERIZE = "posterize";
          public static final String EFFECT_WHITEBOARD = "whiteboard";
          public static final String EFFECT_BLACKBOARD = "blackboard";
          public static final String EFFECT_AQUA = "aqua";
  
          // Values for antibanding settings.
          public static final String ANTIBANDING_AUTO = "auto";
          public static final String ANTIBANDING_50HZ = "50hz";
          public static final String ANTIBANDING_60HZ = "60hz";
          public static final String ANTIBANDING_OFF = "off";
  
          // Values for flash mode settings.
          /**
           * Flash will not be fired.
           */
          public static final String FLASH_MODE_OFF = "off";
  
          /**
           * Flash will be fired automatically when required. The flash may be fired
           * during preview, auto-focus, or snapshot depending on the driver.
           */
          public static final String FLASH_MODE_AUTO = "auto";
  
          /**
           * Flash will always be fired during snapshot. The flash may also be
           * fired during preview or auto-focus depending on the driver.
           */
          public static final String FLASH_MODE_ON = "on";
  
          /**
           * Flash will be fired in red-eye reduction mode.
           */
          public static final String FLASH_MODE_RED_EYE = "red-eye";
  
          /**
           * Constant emission of light during preview, auto-focus and snapshot.
           * This can also be used for video recording.
           */
          public static final String FLASH_MODE_TORCH = "torch";
  
          /**
           * Scene mode is off.
           */
          public static final String SCENE_MODE_AUTO = "auto";
  
          /**
           * Take photos of fast moving objects. Same as {@link
           * #SCENE_MODE_SPORTS}.
           */
          public static final String SCENE_MODE_ACTION = "action";
  
          /**
           * Take people pictures.
           */
          public static final String SCENE_MODE_PORTRAIT = "portrait";
  
          /**
           * Take pictures on distant objects.
           */
          public static final String SCENE_MODE_LANDSCAPE = "landscape";
  
          /**
           * Take photos at night.
           */
          public static final String SCENE_MODE_NIGHT = "night";
  
          /**
           * Take people pictures at night.
           */
          public static final String SCENE_MODE_NIGHT_PORTRAIT = "night-portrait";
  
          /**
           * Take photos in a theater. Flash light is off.
           */
          public static final String SCENE_MODE_THEATRE = "theatre";
  
          /**
           * Take pictures on the beach.
           */
          public static final String SCENE_MODE_BEACH = "beach";
  
          /**
           * Take pictures on the snow.
           */
          public static final String SCENE_MODE_SNOW = "snow";
  
          /**
           * Take sunset photos.
           */
          public static final String SCENE_MODE_SUNSET = "sunset";
  
          /**
           * Avoid blurry pictures (for example, due to hand shake).
           */
          public static final String SCENE_MODE_STEADYPHOTO = "steadyphoto";
  
          /**
           * For shooting firework displays.
           */
          public static final String SCENE_MODE_FIREWORKS = "fireworks";
  
          /**
           * Take photos of fast moving objects. Same as {@link
           * #SCENE_MODE_ACTION}.
           */
          public static final String SCENE_MODE_SPORTS = "sports";
  
          /**
           * Take indoor low-light shot.
           */
          public static final String SCENE_MODE_PARTY = "party";
  
          /**
           * Capture the naturally warm color of scenes lit by candles.
           */
          public static final String SCENE_MODE_CANDLELIGHT = "candlelight";
  
          /**
           * Applications are looking for a barcode. Camera driver will be
           * optimized for barcode reading.
           */
          public static final String SCENE_MODE_BARCODE = "barcode";
  
          /**
           * Capture a scene using high dynamic range imaging techniques. The
           * camera will return an image that has an extended dynamic range
           * compared to a regular capture. Capturing such an image may take
           * longer than a regular capture.
           */
          public static final String SCENE_MODE_HDR = "hdr";
  
          /**
           * Auto-focus mode. Applications should call {@link
           * #autoFocus(AutoFocusCallback)} to start the focus in this mode.
           */
          public static final String FOCUS_MODE_AUTO = "auto";
  
          /**
           * Focus is set at infinity. Applications should not call
           * {@link #autoFocus(AutoFocusCallback)} in this mode.
           */
          public static final String FOCUS_MODE_INFINITY = "infinity";
  
          /**
           * Macro (close-up) focus mode. Applications should call
           * {@link #autoFocus(AutoFocusCallback)} to start the focus in this
           * mode.
           */
          public static final String FOCUS_MODE_MACRO = "macro";
  
          /**
           * Focus is fixed. The camera is always in this mode if the focus is not
           * adjustable. If the camera has auto-focus, this mode can fix the
           * focus, which is usually at hyperfocal distance. Applications should
           * not call {@link #autoFocus(AutoFocusCallback)} in this mode.
           */
          public static final String FOCUS_MODE_FIXED = "fixed";
  
          /**
           * Extended depth of field (EDOF). Focusing is done digitally and
           * continuously. Applications should not call {@link
           * #autoFocus(AutoFocusCallback)} in this mode.
           */
          public static final String FOCUS_MODE_EDOF = "edof";
  
          /**
           * Continuous auto focus mode intended for video recording. The camera
           * continuously tries to focus. This is the best choice for video
           * recording because the focus changes smoothly . Applications still can
           * call {@link #takePicture(Camera.ShutterCallback,
           * Camera.PictureCallback, Camera.PictureCallback)} in this mode but the
           * subject may not be in focus. Auto focus starts when the parameter is
           * set.
           *
           * <p>Since API level 14, applications can call {@link
           * #autoFocus(AutoFocusCallback)} in this mode. The focus callback will
           * immediately return with a boolean that indicates whether the focus is
           * sharp or not. The focus position is locked after autoFocus call. If
           * applications want to resume the continuous focus, cancelAutoFocus
           * must be called. Restarting the preview will not resume the continuous
           * autofocus. To stop continuous focus, applications should change the
           * focus mode to other modes.
           *
           * @see #FOCUS_MODE_CONTINUOUS_PICTURE
           */
          public static final String FOCUS_MODE_CONTINUOUS_VIDEO = "continuous-video";
  
          /**
           * Continuous auto focus mode intended for taking pictures. The camera
           * continuously tries to focus. The speed of focus change is more
           * aggressive than {@link #FOCUS_MODE_CONTINUOUS_VIDEO}. Auto focus
           * starts when the parameter is set.
           *
           * <p>Applications can call {@link #autoFocus(AutoFocusCallback)} in
           * this mode. If the autofocus is in the middle of scanning, the focus
           * callback will return when it completes. If the autofocus is not
           * scanning, the focus callback will immediately return with a boolean
           * that indicates whether the focus is sharp or not. The apps can then
           * decide if they want to take a picture immediately or to change the
           * focus mode to auto, and run a full autofocus cycle. The focus
           * position is locked after autoFocus call. If applications want to
           * resume the continuous focus, cancelAutoFocus must be called.
           * Restarting the preview will not resume the continuous autofocus. To
           * stop continuous focus, applications should change the focus mode to
           * other modes.
           *
           * @see #FOCUS_MODE_CONTINUOUS_VIDEO
           */
          public static final String FOCUS_MODE_CONTINUOUS_PICTURE = "continuous-picture";
  
          // Indices for focus distance array.
          /**
           * The array index of near focus distance for use with
           * {@link #getFocusDistances(float[])}.
           */
          public static final int FOCUS_DISTANCE_NEAR_INDEX = 0;
  
          /**
           * The array index of optimal focus distance for use with
           * {@link #getFocusDistances(float[])}.
           */
          public static final int FOCUS_DISTANCE_OPTIMAL_INDEX = 1;
  
          /**
           * The array index of far focus distance for use with
           * {@link #getFocusDistances(float[])}.
           */
          public static final int FOCUS_DISTANCE_FAR_INDEX = 2;
  
          /**
           * The array index of minimum preview fps for use with {@link
           * #getPreviewFpsRange(int[])} or {@link
           * #getSupportedPreviewFpsRange()}.
           */
          public static final int PREVIEW_FPS_MIN_INDEX = 0;
  
          /**
           * The array index of maximum preview fps for use with {@link
           * #getPreviewFpsRange(int[])} or {@link
           * #getSupportedPreviewFpsRange()}.
           */
          public static final int PREVIEW_FPS_MAX_INDEX = 1;
  
          // Formats for setPreviewFormat and setPictureFormat.
          private static final String PIXEL_FORMAT_YUV422SP = "yuv422sp";
          private static final String PIXEL_FORMAT_YUV420SP = "yuv420sp";
          private static final String PIXEL_FORMAT_YUV422I = "yuv422i-yuyv";
          private static final String PIXEL_FORMAT_YUV420P = "yuv420p";
          private static final String PIXEL_FORMAT_RGB565 = "rgb565";
          private static final String PIXEL_FORMAT_JPEG = "jpeg";
          private static final String PIXEL_FORMAT_BAYER_RGGB = "bayer-rggb";
  
          /**
           * Order matters: Keys that are {@link #set(String, String) set} later
           * will take precedence over keys that are set earlier (if the two keys
           * conflict with each other).
           *
           * <p>One example is {@link #setPreviewFpsRange(int, int)} , since it
           * conflicts with {@link #setPreviewFrameRate(int)} whichever key is set later
           * is the one that will take precedence.
           * </p>
           */
          private final LinkedHashMap<String, String> mMap;
  
          private Parameters() {
              mMap = new LinkedHashMap<String, String>(/*initialCapacity*/64);
          }
  
          /**
           * Overwrite existing parameters with a copy of the ones from {@code other}.
           *
           * <b>For use by the legacy shim only.</b>
           *
           * @hide
           */
          @UnsupportedAppUsage
          public void copyFrom(Parameters other) {
              if (other == null) {
                  throw new NullPointerException("other must not be null");
              }
  
              mMap.putAll(other.mMap);
          }
  
          private Camera getOuter() {
              return Camera.this;
          }
  
  
          /**
           * Value equality check.
           *
           * @hide
           */
          public boolean same(Parameters other) {
              if (this == other) {
                  return true;
              }
              return other != null && Parameters.this.mMap.equals(other.mMap);
          }
  
          /**
           * Writes the current Parameters to the log.
           * @hide
           * @deprecated
           */
          @Deprecated
          @UnsupportedAppUsage
          public void dump() {
              Log.e(TAG, "dump: size=" + mMap.size());
              for (String k : mMap.keySet()) {
                  Log.e(TAG, "dump: " + k + "=" + mMap.get(k));
              }
          }
  
          /**
           * Creates a single string with all the parameters set in
           * this Parameters object.
           * <p>The {@link #unflatten(String)} method does the reverse.</p>
           *
           * @return a String with all values from this Parameters object, in
           *         semi-colon delimited key-value pairs
           */
          public String flatten() {
              StringBuilder flattened = new StringBuilder(128);
              for (String k : mMap.keySet()) {
                  flattened.append(k);
                  flattened.append("=");
                  flattened.append(mMap.get(k));
                  flattened.append(";");
              }
              // chop off the extra semicolon at the end
              flattened.deleteCharAt(flattened.length()-1);
              return flattened.toString();
          }
  
          /**
           * Takes a flattened string of parameters and adds each one to
           * this Parameters object.
           * <p>The {@link #flatten()} method does the reverse.</p>
           *
           * @param flattened a String of parameters (key-value paired) that
           *                  are semi-colon delimited
           */
          public void unflatten(String flattened) {
              mMap.clear();
  
              TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(';');
              splitter.setString(flattened);
              for (String kv : splitter) {
                  int pos = kv.indexOf('=');
                  if (pos == -1) {
                      continue;
                  }
                  String k = kv.substring(0, pos);
                  String v = kv.substring(pos + 1);
                  mMap.put(k, v);
              }
          }
  
          public void remove(String key) {
              mMap.remove(key);
          }
  
          /**
           * Sets a String parameter.
           *
           * @param key   the key name for the parameter
           * @param value the String value of the parameter
           */
          public void set(String key, String value) {
              if (key.indexOf('=') != -1 || key.indexOf(';') != -1 || key.indexOf(0) != -1) {
                  Log.e(TAG, "Key \"" + key + "\" contains invalid character (= or ; or \\0)");
                  return;
              }
              if (value.indexOf('=') != -1 || value.indexOf(';') != -1 || value.indexOf(0) != -1) {
                  Log.e(TAG, "Value \"" + value + "\" contains invalid character (= or ; or \\0)");
                  return;
              }
  
              put(key, value);
          }
  
          /**
           * Sets an integer parameter.
           *
           * @param key   the key name for the parameter
           * @param value the int value of the parameter
           */
          public void set(String key, int value) {
              put(key, Integer.toString(value));
          }
  
          private void put(String key, String value) {
              /*
               * Remove the key if it already exists.
               *
               * This way setting a new value for an already existing key will always move
               * that key to be ordered the latest in the map.
               */
              mMap.remove(key);
              mMap.put(key, value);
          }
  
          private void set(String key, List<Area> areas) {
              if (areas == null) {
                  set(key, "(0,0,0,0,0)");
              } else {
                  StringBuilder buffer = new StringBuilder();
                  for (int i = 0; i < areas.size(); i++) {
                      Area area = areas.get(i);
                      Rect rect = area.rect;
                      buffer.append('(');
                      buffer.append(rect.left);
                      buffer.append(',');
                      buffer.append(rect.top);
                      buffer.append(',');
                      buffer.append(rect.right);
                      buffer.append(',');
                      buffer.append(rect.bottom);
                      buffer.append(',');
                      buffer.append(area.weight);
                      buffer.append(')');
                      if (i != areas.size() - 1) buffer.append(',');
                  }
                  set(key, buffer.toString());
              }
          }
  
          /**
           * Returns the value of a String parameter.
           *
           * @param key the key name for the parameter
           * @return the String value of the parameter
           */
          public String get(String key) {
              return mMap.get(key);
          }
  
          /**
           * Returns the value of an integer parameter.
           *
           * @param key the key name for the parameter
           * @return the int value of the parameter
           */
          public int getInt(String key) {
              return Integer.parseInt(mMap.get(key));
          }
  
          /**
           * Sets the dimensions for preview pictures. If the preview has already
           * started, applications should stop the preview first before changing
           * preview size.
           *
           * The sides of width and height are based on camera orientation. That
           * is, the preview size is the size before it is rotated by display
           * orientation. So applications need to consider the display orientation
           * while setting preview size. For example, suppose the camera supports
           * both 480x320 and 320x480 preview sizes. The application wants a 3:2
           * preview ratio. If the display orientation is set to 0 or 180, preview
           * size should be set to 480x320. If the display orientation is set to
           * 90 or 270, preview size should be set to 320x480. The display
           * orientation should also be considered while setting picture size and
           * thumbnail size.
           *
           * Exception on 176x144 (QCIF) resolution:
           * Camera devices usually have a fixed capability for downscaling from
           * larger resolution to smaller, and the QCIF resolution sometimes
           * is not fully supported due to this limitation on devices with
           * high-resolution image sensors. Therefore, trying to configure a QCIF
           * preview size with any picture or video size larger than 1920x1080
           * (either width or height) might not be supported, and
           * {@link #setParameters(Camera.Parameters)} might throw a
           * RuntimeException if it is not.
           *
           * @param width  the width of the pictures, in pixels
           * @param height the height of the pictures, in pixels
           * @see #setDisplayOrientation(int)
           * @see #getCameraInfo(int, CameraInfo)
           * @see #setPictureSize(int, int)
           * @see #setJpegThumbnailSize(int, int)
           */
          public void setPreviewSize(int width, int height) {
              String v = Integer.toString(width) + "x" + Integer.toString(height);
              set(KEY_PREVIEW_SIZE, v);
          }
  
          /**
           * Returns the dimensions setting for preview pictures.
           *
           * @return a Size object with the width and height setting
           *          for the preview picture
           */
          public Size getPreviewSize() {
              String pair = get(KEY_PREVIEW_SIZE);
              return strToSize(pair);
          }
  
          /**
           * Gets the supported preview sizes.
           *
           * @return a list of Size object. This method will always return a list
           *         with at least one element.
           */
          public List<Size> getSupportedPreviewSizes() {
              String str = get(KEY_PREVIEW_SIZE + SUPPORTED_VALUES_SUFFIX);
              return splitSize(str);
          }
  
          /**
           * <p>Gets the supported video frame sizes that can be used by
           * MediaRecorder.</p>
           *
           * <p>If the returned list is not null, the returned list will contain at
           * least one Size and one of the sizes in the returned list must be
           * passed to MediaRecorder.setVideoSize() for camcorder application if
           * camera is used as the video source. In this case, the size of the
           * preview can be different from the resolution of the recorded video
           * during video recording.</p>
           *
           * <p>Exception on 176x144 (QCIF) resolution:
           * Camera devices usually have a fixed capability for downscaling from
           * larger resolution to smaller, and the QCIF resolution sometimes
           * is not fully supported due to this limitation on devices with
           * high-resolution image sensors. Therefore, trying to configure a QCIF
           * video resolution with any preview or picture size larger than
           * 1920x1080  (either width or height) might not be supported, and
           * {@link #setParameters(Camera.Parameters)} will throw a
           * RuntimeException if it is not.</p>
           *
           * @return a list of Size object if camera has separate preview and
           *         video output; otherwise, null is returned.
           * @see #getPreferredPreviewSizeForVideo()
           */
          public List<Size> getSupportedVideoSizes() {
              String str = get(KEY_VIDEO_SIZE + SUPPORTED_VALUES_SUFFIX);
              return splitSize(str);
          }
  
          /**
           * Returns the preferred or recommended preview size (width and height)
           * in pixels for video recording. Camcorder applications should
           * set the preview size to a value that is not larger than the
           * preferred preview size. In other words, the product of the width
           * and height of the preview size should not be larger than that of
           * the preferred preview size. In addition, we recommend to choose a
           * preview size that has the same aspect ratio as the resolution of
           * video to be recorded.
           *
           * @return the preferred preview size (width and height) in pixels for
           *         video recording if getSupportedVideoSizes() does not return
           *         null; otherwise, null is returned.
           * @see #getSupportedVideoSizes()
           */
          public Size getPreferredPreviewSizeForVideo() {
              String pair = get(KEY_PREFERRED_PREVIEW_SIZE_FOR_VIDEO);
              return strToSize(pair);
          }
  
          /**
           * <p>Sets the dimensions for EXIF thumbnail in Jpeg picture. If
           * applications set both width and height to 0, EXIF will not contain
           * thumbnail.</p>
           *
           * <p>Applications need to consider the display orientation. See {@link
           * #setPreviewSize(int,int)} for reference.</p>
           *
           * @param width  the width of the thumbnail, in pixels
           * @param height the height of the thumbnail, in pixels
           * @see #setPreviewSize(int,int)
           */
          public void setJpegThumbnailSize(int width, int height) {
              set(KEY_JPEG_THUMBNAIL_WIDTH, width);
              set(KEY_JPEG_THUMBNAIL_HEIGHT, height);
          }
  
          /**
           * Returns the dimensions for EXIF thumbnail in Jpeg picture.
           *
           * @return a Size object with the height and width setting for the EXIF
           *         thumbnails
           */
          public Size getJpegThumbnailSize() {
              return new Size(getInt(KEY_JPEG_THUMBNAIL_WIDTH),
                              getInt(KEY_JPEG_THUMBNAIL_HEIGHT));
          }
  
          /**
           * Gets the supported jpeg thumbnail sizes.
           *
           * @return a list of Size object. This method will always return a list
           *         with at least two elements. Size 0,0 (no thumbnail) is always
           *         supported.
           */
          public List<Size> getSupportedJpegThumbnailSizes() {
              String str = get(KEY_JPEG_THUMBNAIL_SIZE + SUPPORTED_VALUES_SUFFIX);
              return splitSize(str);
          }
  
          /**
           * Sets the quality of the EXIF thumbnail in Jpeg picture.
           *
           * @param quality the JPEG quality of the EXIF thumbnail. The range is 1
           *                to 100, with 100 being the best.
           */
          public void setJpegThumbnailQuality(int quality) {
              set(KEY_JPEG_THUMBNAIL_QUALITY, quality);
          }
  
          /**
           * Returns the quality setting for the EXIF thumbnail in Jpeg picture.
           *
           * @return the JPEG quality setting of the EXIF thumbnail.
           */
          public int getJpegThumbnailQuality() {
              return getInt(KEY_JPEG_THUMBNAIL_QUALITY);
          }
  
          /**
           * Sets Jpeg quality of captured picture.
           *
           * @param quality the JPEG quality of captured picture. The range is 1
           *                to 100, with 100 being the best.
           */
          public void setJpegQuality(int quality) {
              set(KEY_JPEG_QUALITY, quality);
          }
  
          /**
           * Returns the quality setting for the JPEG picture.
           *
           * @return the JPEG picture quality setting.
           */
          public int getJpegQuality() {
              return getInt(KEY_JPEG_QUALITY);
          }
  
          /**
           * Sets the rate at which preview frames are received. This is the
           * target frame rate. The actual frame rate depends on the driver.
           *
           * @param fps the frame rate (frames per second)
           * @deprecated replaced by {@link #setPreviewFpsRange(int,int)}
           */
          @Deprecated
          public void setPreviewFrameRate(int fps) {
              set(KEY_PREVIEW_FRAME_RATE, fps);
          }
  
          /**
           * Returns the setting for the rate at which preview frames are
           * received. This is the target frame rate. The actual frame rate
           * depends on the driver.
           *
           * @return the frame rate setting (frames per second)
           * @deprecated replaced by {@link #getPreviewFpsRange(int[])}
           */
          @Deprecated
          public int getPreviewFrameRate() {
              return getInt(KEY_PREVIEW_FRAME_RATE);
          }
  
          /**
           * Gets the supported preview frame rates.
           *
           * @return a list of supported preview frame rates. null if preview
           *         frame rate setting is not supported.
           * @deprecated replaced by {@link #getSupportedPreviewFpsRange()}
           */
          @Deprecated
          public List<Integer> getSupportedPreviewFrameRates() {
              String str = get(KEY_PREVIEW_FRAME_RATE + SUPPORTED_VALUES_SUFFIX);
              return splitInt(str);
          }
  
          /**
           * Sets the minimum and maximum preview fps. This controls the rate of
           * preview frames received in {@link PreviewCallback}. The minimum and
           * maximum preview fps must be one of the elements from {@link
           * #getSupportedPreviewFpsRange}.
           *
           * @param min the minimum preview fps (scaled by 1000).
           * @param max the maximum preview fps (scaled by 1000).
           * @throws RuntimeException if fps range is invalid.
           * @see #setPreviewCallbackWithBuffer(Camera.PreviewCallback)
           * @see #getSupportedPreviewFpsRange()
           */
          public void setPreviewFpsRange(int min, int max) {
              set(KEY_PREVIEW_FPS_RANGE, "" + min + "," + max);
          }
  
          /**
           * Returns the current minimum and maximum preview fps. The values are
           * one of the elements returned by {@link #getSupportedPreviewFpsRange}.
           *
           * @return range the minimum and maximum preview fps (scaled by 1000).
           * @see #PREVIEW_FPS_MIN_INDEX
           * @see #PREVIEW_FPS_MAX_INDEX
           * @see #getSupportedPreviewFpsRange()
           */
          public void getPreviewFpsRange(int[] range) {
              if (range == null || range.length != 2) {
                  throw new IllegalArgumentException(
                          "range must be an array with two elements.");
              }
              splitInt(get(KEY_PREVIEW_FPS_RANGE), range);
          }
  
          /**
           * Gets the supported preview fps (frame-per-second) ranges. Each range
           * contains a minimum fps and maximum fps. If minimum fps equals to
           * maximum fps, the camera outputs frames in fixed frame rate. If not,
           * the camera outputs frames in auto frame rate. The actual frame rate
           * fluctuates between the minimum and the maximum. The values are
           * multiplied by 1000 and represented in integers. For example, if frame
           * rate is 26.623 frames per second, the value is 26623.
           *
           * @return a list of supported preview fps ranges. This method returns a
           *         list with at least one element. Every element is an int array
           *         of two values - minimum fps and maximum fps. The list is
           *         sorted from small to large (first by maximum fps and then
           *         minimum fps).
           * @see #PREVIEW_FPS_MIN_INDEX
           * @see #PREVIEW_FPS_MAX_INDEX
           */
          public List<int[]> getSupportedPreviewFpsRange() {
              String str = get(KEY_PREVIEW_FPS_RANGE + SUPPORTED_VALUES_SUFFIX);
              return splitRange(str);
          }
  
          /**
           * Sets the image format for preview pictures.
           * <p>If this is never called, the default format will be
           * {@link android.graphics.ImageFormat#NV21}, which
           * uses the NV21 encoding format.</p>
           *
           * <p>Use {@link Parameters#getSupportedPreviewFormats} to get a list of
           * the available preview formats.
           *
           * <p>It is strongly recommended that either
           * {@link android.graphics.ImageFormat#NV21} or
           * {@link android.graphics.ImageFormat#YV12} is used, since
           * they are supported by all camera devices.</p>
           *
           * <p>For YV12, the image buffer that is received is not necessarily
           * tightly packed, as there may be padding at the end of each row of
           * pixel data, as described in
           * {@link android.graphics.ImageFormat#YV12}. For camera callback data,
           * it can be assumed that the stride of the Y and UV data is the
           * smallest possible that meets the alignment requirements. That is, if
           * the preview size is <var>width x height</var>, then the following
           * equations describe the buffer index for the beginning of row
           * <var>y</var> for the Y plane and row <var>c</var> for the U and V
           * planes:
           *
           * <pre>{@code
           * yStride   = (int) ceil(width / 16.0) * 16;
           * uvStride  = (int) ceil( (yStride / 2) / 16.0) * 16;
           * ySize     = yStride * height;
           * uvSize    = uvStride * height / 2;
           * yRowIndex = yStride * y;
           * uRowIndex = ySize + uvSize + uvStride * c;
           * vRowIndex = ySize + uvStride * c;
           * size      = ySize + uvSize * 2;
           * }
           *</pre>
           *
           * @param pixel_format the desired preview picture format, defined by
           *   one of the {@link android.graphics.ImageFormat} constants.  (E.g.,
           *   <var>ImageFormat.NV21</var> (default), or
           *   <var>ImageFormat.YV12</var>)
           *
           * @see android.graphics.ImageFormat
           * @see android.hardware.Camera.Parameters#getSupportedPreviewFormats
           */
          public void setPreviewFormat(int pixel_format) {
              String s = cameraFormatForPixelFormat(pixel_format);
              if (s == null) {
                  throw new IllegalArgumentException(
                          "Invalid pixel_format=" + pixel_format);
              }
  
              set(KEY_PREVIEW_FORMAT, s);
          }
  
          /**
           * Returns the image format for preview frames got from
           * {@link PreviewCallback}.
           *
           * @return the preview format.
           * @see android.graphics.ImageFormat
           * @see #setPreviewFormat
           */
          public int getPreviewFormat() {
              return pixelFormatForCameraFormat(get(KEY_PREVIEW_FORMAT));
          }
  
          /**
           * Gets the supported preview formats. {@link android.graphics.ImageFormat#NV21}
           * is always supported. {@link android.graphics.ImageFormat#YV12}
           * is always supported since API level 12.
           *
           * @return a list of supported preview formats. This method will always
           *         return a list with at least one element.
           * @see android.graphics.ImageFormat
           * @see #setPreviewFormat
           */
          public List<Integer> getSupportedPreviewFormats() {
              String str = get(KEY_PREVIEW_FORMAT + SUPPORTED_VALUES_SUFFIX);
              ArrayList<Integer> formats = new ArrayList<Integer>();
              for (String s : split(str)) {
                  int f = pixelFormatForCameraFormat(s);
                  if (f == ImageFormat.UNKNOWN) continue;
                  formats.add(f);
              }
              return formats;
          }
  
          /**
           * <p>Sets the dimensions for pictures.</p>
           *
           * <p>Applications need to consider the display orientation. See {@link
           * #setPreviewSize(int,int)} for reference.</p>
           *
           * <p>Exception on 176x144 (QCIF) resolution:
           * Camera devices usually have a fixed capability for downscaling from
           * larger resolution to smaller, and the QCIF resolution sometimes
           * is not fully supported due to this limitation on devices with
           * high-resolution image sensors. Therefore, trying to configure a QCIF
           * picture size with any preview or video size larger than 1920x1080
           * (either width or height) might not be supported, and
           * {@link #setParameters(Camera.Parameters)} might throw a
           * RuntimeException if it is not.</p>
           *
           * @param width  the width for pictures, in pixels
           * @param height the height for pictures, in pixels
           * @see #setPreviewSize(int,int)
           *
           */
          public void setPictureSize(int width, int height) {
              String v = Integer.toString(width) + "x" + Integer.toString(height);
              set(KEY_PICTURE_SIZE, v);
          }
  
          /**
           * Returns the dimension setting for pictures.
           *
           * @return a Size object with the height and width setting
           *          for pictures
           */
          public Size getPictureSize() {
              String pair = get(KEY_PICTURE_SIZE);
              return strToSize(pair);
          }
  
          /**
           * Gets the supported picture sizes.
           *
           * @return a list of supported picture sizes. This method will always
           *         return a list with at least one element.
           */
          public List<Size> getSupportedPictureSizes() {
              String str = get(KEY_PICTURE_SIZE + SUPPORTED_VALUES_SUFFIX);
              return splitSize(str);
          }
  
          /**
           * Sets the image format for pictures.
           *
           * @param pixel_format the desired picture format
           *                     (<var>ImageFormat.NV21</var>,
           *                      <var>ImageFormat.RGB_565</var>, or
           *                      <var>ImageFormat.JPEG</var>)
           * @see android.graphics.ImageFormat
           */
          public void setPictureFormat(int pixel_format) {
              String s = cameraFormatForPixelFormat(pixel_format);
              if (s == null) {
                  throw new IllegalArgumentException(
                          "Invalid pixel_format=" + pixel_format);
              }
  
              set(KEY_PICTURE_FORMAT, s);
          }
  
          /**
           * Returns the image format for pictures.
           *
           * @return the picture format
           * @see android.graphics.ImageFormat
           */
          public int getPictureFormat() {
              return pixelFormatForCameraFormat(get(KEY_PICTURE_FORMAT));
          }
  
          /**
           * Gets the supported picture formats.
           *
           * @return supported picture formats. This method will always return a
           *         list with at least one element.
           * @see android.graphics.ImageFormat
           */
          public List<Integer> getSupportedPictureFormats() {
              String str = get(KEY_PICTURE_FORMAT + SUPPORTED_VALUES_SUFFIX);
              ArrayList<Integer> formats = new ArrayList<Integer>();
              for (String s : split(str)) {
                  int f = pixelFormatForCameraFormat(s);
                  if (f == ImageFormat.UNKNOWN) continue;
                  formats.add(f);
              }
              return formats;
          }
  
          private String cameraFormatForPixelFormat(int pixel_format) {
              switch(pixel_format) {
              case ImageFormat.NV16:      return PIXEL_FORMAT_YUV422SP;
              case ImageFormat.NV21:      return PIXEL_FORMAT_YUV420SP;
              case ImageFormat.YUY2:      return PIXEL_FORMAT_YUV422I;
              case ImageFormat.YV12:      return PIXEL_FORMAT_YUV420P;
              case ImageFormat.RGB_565:   return PIXEL_FORMAT_RGB565;
              case ImageFormat.JPEG:      return PIXEL_FORMAT_JPEG;
              default:                    return null;
              }
          }
  
          private int pixelFormatForCameraFormat(String format) {
              if (format == null)
                  return ImageFormat.UNKNOWN;
  
              if (format.equals(PIXEL_FORMAT_YUV422SP))
                  return ImageFormat.NV16;
  
              if (format.equals(PIXEL_FORMAT_YUV420SP))
                  return ImageFormat.NV21;
  
              if (format.equals(PIXEL_FORMAT_YUV422I))
                  return ImageFormat.YUY2;
  
              if (format.equals(PIXEL_FORMAT_YUV420P))
                  return ImageFormat.YV12;
  
              if (format.equals(PIXEL_FORMAT_RGB565))
                  return ImageFormat.RGB_565;
  
              if (format.equals(PIXEL_FORMAT_JPEG))
                  return ImageFormat.JPEG;
  
              return ImageFormat.UNKNOWN;
          }
  
          /**
           * Sets the clockwise rotation angle in degrees relative to the
           * orientation of the camera. This affects the pictures returned from
           * JPEG {@link PictureCallback}. The camera driver may set orientation
           * in the EXIF header without rotating the picture. Or the driver may
           * rotate the picture and the EXIF thumbnail. If the Jpeg picture is
           * rotated, the orientation in the EXIF header will be missing or 1 (row
           * #0 is top and column #0 is left side).
           *
           * <p>
           * If applications want to rotate the picture to match the orientation
           * of what users see, apps should use
           * {@link android.view.OrientationEventListener} and
           * {@link android.hardware.Camera.CameraInfo}. The value from
           * OrientationEventListener is relative to the natural orientation of
           * the device. CameraInfo.orientation is the angle between camera
           * orientation and natural device orientation. The sum of the two is the
           * rotation angle for back-facing camera. The difference of the two is
           * the rotation angle for front-facing camera. Note that the JPEG
           * pictures of front-facing cameras are not mirrored as in preview
           * display.
           *
           * <p>
           * For example, suppose the natural orientation of the device is
           * portrait. The device is rotated 270 degrees clockwise, so the device
           * orientation is 270. Suppose a back-facing camera sensor is mounted in
           * landscape and the top side of the camera sensor is aligned with the
           * right edge of the display in natural orientation. So the camera
           * orientation is 90. The rotation should be set to 0 (270 + 90).
           *
           * <p>The reference code is as follows.
           *
           * <pre>
           * public void onOrientationChanged(int orientation) {
           *     if (orientation == ORIENTATION_UNKNOWN) return;
           *     android.hardware.Camera.CameraInfo info =
           *            new android.hardware.Camera.CameraInfo();
           *     android.hardware.Camera.getCameraInfo(cameraId, info);
           *     orientation = (orientation + 45) / 90 * 90;
           *     int rotation = 0;
           *     if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
           *         rotation = (info.orientation - orientation + 360) % 360;
           *     } else {  // back-facing camera
           *         rotation = (info.orientation + orientation) % 360;
           *     }
           *     mParameters.setRotation(rotation);
           * }
           * </pre>
           *
           * @param rotation The rotation angle in degrees relative to the
           *                 orientation of the camera. Rotation can only be 0,
           *                 90, 180 or 270.
           * @throws IllegalArgumentException if rotation value is invalid.
           * @see android.view.OrientationEventListener
           * @see #getCameraInfo(int, CameraInfo)
           */
          public void setRotation(int rotation) {
              if (rotation == 0 || rotation == 90 || rotation == 180
                      || rotation == 270) {
                  set(KEY_ROTATION, Integer.toString(rotation));
              } else {
                  throw new IllegalArgumentException(
                          "Invalid rotation=" + rotation);
              }
          }
  
          /**
           * Sets GPS latitude coordinate. This will be stored in JPEG EXIF
           * header.
           *
           * @param latitude GPS latitude coordinate.
           */
          public void setGpsLatitude(double latitude) {
              set(KEY_GPS_LATITUDE, Double.toString(latitude));
          }
  
          /**
           * Sets GPS longitude coordinate. This will be stored in JPEG EXIF
           * header.
           *
           * @param longitude GPS longitude coordinate.
           */
          public void setGpsLongitude(double longitude) {
              set(KEY_GPS_LONGITUDE, Double.toString(longitude));
          }
  
          /**
           * Sets GPS altitude. This will be stored in JPEG EXIF header.
           *
           * @param altitude GPS altitude in meters.
           */
          public void setGpsAltitude(double altitude) {
              set(KEY_GPS_ALTITUDE, Double.toString(altitude));
          }
  
          /**
           * Sets GPS timestamp. This will be stored in JPEG EXIF header.
           *
           * @param timestamp GPS timestamp (UTC in seconds since January 1,
           *                  1970).
           */
          public void setGpsTimestamp(long timestamp) {
              set(KEY_GPS_TIMESTAMP, Long.toString(timestamp));
          }
  
          /**
           * Sets GPS processing method. The method will be stored in a UTF-8 string up to 31 bytes
           * long, in the JPEG EXIF header.
           *
           * @param processing_method The processing method to get this location.
           */
          public void setGpsProcessingMethod(String processing_method) {
              set(KEY_GPS_PROCESSING_METHOD, processing_method);
          }
  
          /**
           * Removes GPS latitude, longitude, altitude, and timestamp from the
           * parameters.
           */
          public void removeGpsData() {
              remove(KEY_GPS_LATITUDE);
              remove(KEY_GPS_LONGITUDE);
              remove(KEY_GPS_ALTITUDE);
              remove(KEY_GPS_TIMESTAMP);
              remove(KEY_GPS_PROCESSING_METHOD);
          }
  
          /**
           * Gets the current white balance setting.
           *
           * @return current white balance. null if white balance setting is not
           *         supported.
           * @see #WHITE_BALANCE_AUTO
           * @see #WHITE_BALANCE_INCANDESCENT
           * @see #WHITE_BALANCE_FLUORESCENT
           * @see #WHITE_BALANCE_WARM_FLUORESCENT
           * @see #WHITE_BALANCE_DAYLIGHT
           * @see #WHITE_BALANCE_CLOUDY_DAYLIGHT
           * @see #WHITE_BALANCE_TWILIGHT
           * @see #WHITE_BALANCE_SHADE
           *
           */
          public String getWhiteBalance() {
              return get(KEY_WHITE_BALANCE);
          }
  
          /**
           * Sets the white balance. Changing the setting will release the
           * auto-white balance lock. It is recommended not to change white
           * balance and AWB lock at the same time.
           *
           * @param value new white balance.
           * @see #getWhiteBalance()
           * @see #setAutoWhiteBalanceLock(boolean)
           */
          public void setWhiteBalance(String value) {
              String oldValue = get(KEY_WHITE_BALANCE);
              if (same(value, oldValue)) return;
              set(KEY_WHITE_BALANCE, value);
              set(KEY_AUTO_WHITEBALANCE_LOCK, FALSE);
          }
  
          /**
           * Gets the supported white balance.
           *
           * @return a list of supported white balance. null if white balance
           *         setting is not supported.
           * @see #getWhiteBalance()
           */
          public List<String> getSupportedWhiteBalance() {
              String str = get(KEY_WHITE_BALANCE + SUPPORTED_VALUES_SUFFIX);
              return split(str);
          }
  
          /**
           * Gets the current color effect setting.
           *
           * @return current color effect. null if color effect
           *         setting is not supported.
           * @see #EFFECT_NONE
           * @see #EFFECT_MONO
           * @see #EFFECT_NEGATIVE
           * @see #EFFECT_SOLARIZE
           * @see #EFFECT_SEPIA
           * @see #EFFECT_POSTERIZE
           * @see #EFFECT_WHITEBOARD
           * @see #EFFECT_BLACKBOARD
           * @see #EFFECT_AQUA
           */
          public String getColorEffect() {
              return get(KEY_EFFECT);
          }
  
          /**
           * Sets the current color effect setting.
           *
           * @param value new color effect.
           * @see #getColorEffect()
           */
          public void setColorEffect(String value) {
              set(KEY_EFFECT, value);
          }
  
          /**
           * Gets the supported color effects.
           *
           * @return a list of supported color effects. null if color effect
           *         setting is not supported.
           * @see #getColorEffect()
           */
          public List<String> getSupportedColorEffects() {
              String str = get(KEY_EFFECT + SUPPORTED_VALUES_SUFFIX);
              return split(str);
          }
  
  
          /**
           * Gets the current antibanding setting.
           *
           * @return current antibanding. null if antibanding setting is not
           *         supported.
           * @see #ANTIBANDING_AUTO
           * @see #ANTIBANDING_50HZ
           * @see #ANTIBANDING_60HZ
           * @see #ANTIBANDING_OFF
           */
          public String getAntibanding() {
              return get(KEY_ANTIBANDING);
          }
  
          /**
           * Sets the antibanding.
           *
           * @param antibanding new antibanding value.
           * @see #getAntibanding()
           */
          public void setAntibanding(String antibanding) {
              set(KEY_ANTIBANDING, antibanding);
          }
  
          /**
           * Gets the supported antibanding values.
           *
           * @return a list of supported antibanding values. null if antibanding
           *         setting is not supported.
           * @see #getAntibanding()
           */
          public List<String> getSupportedAntibanding() {
              String str = get(KEY_ANTIBANDING + SUPPORTED_VALUES_SUFFIX);
              return split(str);
          }
  
          /**
           * Gets the current scene mode setting.
           *
           * @return one of SCENE_MODE_XXX string constant. null if scene mode
           *         setting is not supported.
           * @see #SCENE_MODE_AUTO
           * @see #SCENE_MODE_ACTION
           * @see #SCENE_MODE_PORTRAIT
           * @see #SCENE_MODE_LANDSCAPE
           * @see #SCENE_MODE_NIGHT
           * @see #SCENE_MODE_NIGHT_PORTRAIT
           * @see #SCENE_MODE_THEATRE
           * @see #SCENE_MODE_BEACH
           * @see #SCENE_MODE_SNOW
           * @see #SCENE_MODE_SUNSET
           * @see #SCENE_MODE_STEADYPHOTO
           * @see #SCENE_MODE_FIREWORKS
           * @see #SCENE_MODE_SPORTS
           * @see #SCENE_MODE_PARTY
           * @see #SCENE_MODE_CANDLELIGHT
           * @see #SCENE_MODE_BARCODE
           */
          public String getSceneMode() {
              return get(KEY_SCENE_MODE);
          }
  
          /**
           * Sets the scene mode. Changing scene mode may override other
           * parameters (such as flash mode, focus mode, white balance). For
           * example, suppose originally flash mode is on and supported flash
           * modes are on/off. In night scene mode, both flash mode and supported
           * flash mode may be changed to off. After setting scene mode,
           * applications should call getParameters to know if some parameters are
           * changed.
           *
           * @param value scene mode.
           * @see #getSceneMode()
           */
          public void setSceneMode(String value) {
              set(KEY_SCENE_MODE, value);
          }
  
          /**
           * Gets the supported scene modes.
           *
           * @return a list of supported scene modes. null if scene mode setting
           *         is not supported.
           * @see #getSceneMode()
           */
          public List<String> getSupportedSceneModes() {
              String str = get(KEY_SCENE_MODE + SUPPORTED_VALUES_SUFFIX);
              return split(str);
          }
  
          /**
           * Gets the current flash mode setting.
           *
           * @return current flash mode. null if flash mode setting is not
           *         supported.
           * @see #FLASH_MODE_OFF
           * @see #FLASH_MODE_AUTO
           * @see #FLASH_MODE_ON
           * @see #FLASH_MODE_RED_EYE
           * @see #FLASH_MODE_TORCH
           */
          public String getFlashMode() {
              return get(KEY_FLASH_MODE);
          }
  
          /**
           * Sets the flash mode.
           *
           * @param value flash mode.
           * @see #getFlashMode()
           */
          public void setFlashMode(String value) {
              set(KEY_FLASH_MODE, value);
          }
  
          /**
           * Gets the supported flash modes.
           *
           * @return a list of supported flash modes. null if flash mode setting
           *         is not supported.
           * @see #getFlashMode()
           */
          public List<String> getSupportedFlashModes() {
              String str = get(KEY_FLASH_MODE + SUPPORTED_VALUES_SUFFIX);
              return split(str);
          }
  
          /**
           * Gets the current focus mode setting.
           *
           * @return current focus mode. This method will always return a non-null
           *         value. Applications should call {@link
           *         #autoFocus(AutoFocusCallback)} to start the focus if focus
           *         mode is FOCUS_MODE_AUTO or FOCUS_MODE_MACRO.
           * @see #FOCUS_MODE_AUTO
           * @see #FOCUS_MODE_INFINITY
           * @see #FOCUS_MODE_MACRO
           * @see #FOCUS_MODE_FIXED
           * @see #FOCUS_MODE_EDOF
           * @see #FOCUS_MODE_CONTINUOUS_VIDEO
           */
          public String getFocusMode() {
              return get(KEY_FOCUS_MODE);
          }
  
          /**
           * Sets the focus mode.
           *
           * @param value focus mode.
           * @see #getFocusMode()
           */
          public void setFocusMode(String value) {
              set(KEY_FOCUS_MODE, value);
          }
  
          /**
           * Gets the supported focus modes.
           *
           * @return a list of supported focus modes. This method will always
           *         return a list with at least one element.
           * @see #getFocusMode()
           */
          public List<String> getSupportedFocusModes() {
              String str = get(KEY_FOCUS_MODE + SUPPORTED_VALUES_SUFFIX);
              return split(str);
          }
  
          /**
           * Gets the focal length (in millimeter) of the camera.
           *
           * @return the focal length. Returns -1.0 when the device
           *         doesn't report focal length information.
           */
          public float getFocalLength() {
              return Float.parseFloat(get(KEY_FOCAL_LENGTH));
          }
  
          /**
           * Gets the horizontal angle of view in degrees.
           *
           * @return horizontal angle of view. Returns -1.0 when the device
           *         doesn't report view angle information.
           */
          public float getHorizontalViewAngle() {
              return Float.parseFloat(get(KEY_HORIZONTAL_VIEW_ANGLE));
          }
  
          /**
           * Gets the vertical angle of view in degrees.
           *
           * @return vertical angle of view. Returns -1.0 when the device
           *         doesn't report view angle information.
           */
          public float getVerticalViewAngle() {
              return Float.parseFloat(get(KEY_VERTICAL_VIEW_ANGLE));
          }
  
          /**
           * Gets the current exposure compensation index.
           *
           * @return current exposure compensation index. The range is {@link
           *         #getMinExposureCompensation} to {@link
           *         #getMaxExposureCompensation}. 0 means exposure is not
           *         adjusted.
           */
          public int getExposureCompensation() {
              return getInt(KEY_EXPOSURE_COMPENSATION, 0);
          }
  
          /**
           * Sets the exposure compensation index.
           *
           * @param value exposure compensation index. The valid value range is
           *        from {@link #getMinExposureCompensation} (inclusive) to {@link
           *        #getMaxExposureCompensation} (inclusive). 0 means exposure is
           *        not adjusted. Application should call
           *        getMinExposureCompensation and getMaxExposureCompensation to
           *        know if exposure compensation is supported.
           */
          public void setExposureCompensation(int value) {
              set(KEY_EXPOSURE_COMPENSATION, value);
          }
  
          /**
           * Gets the maximum exposure compensation index.
           *
           * @return maximum exposure compensation index (>=0). If both this
           *         method and {@link #getMinExposureCompensation} return 0,
           *         exposure compensation is not supported.
           */
          public int getMaxExposureCompensation() {
              return getInt(KEY_MAX_EXPOSURE_COMPENSATION, 0);
          }
  
          /**
           * Gets the minimum exposure compensation index.
           *
           * @return minimum exposure compensation index (<=0). If both this
           *         method and {@link #getMaxExposureCompensation} return 0,
           *         exposure compensation is not supported.
           */
          public int getMinExposureCompensation() {
              return getInt(KEY_MIN_EXPOSURE_COMPENSATION, 0);
          }
  
          /**
           * Gets the exposure compensation step.
           *
           * @return exposure compensation step. Applications can get EV by
           *         multiplying the exposure compensation index and step. Ex: if
           *         exposure compensation index is -6 and step is 0.333333333, EV
           *         is -2.
           */
          public float getExposureCompensationStep() {
              return getFloat(KEY_EXPOSURE_COMPENSATION_STEP, 0);
          }
  
          /**
           * <p>Sets the auto-exposure lock state. Applications should check
           * {@link #isAutoExposureLockSupported} before using this method.</p>
           *
           * <p>If set to true, the camera auto-exposure routine will immediately
           * pause until the lock is set to false. Exposure compensation settings
           * changes will still take effect while auto-exposure is locked.</p>
           *
           * <p>If auto-exposure is already locked, setting this to true again has
           * no effect (the driver will not recalculate exposure values).</p>
           *
           * <p>Stopping preview with {@link #stopPreview()}, or triggering still
           * image capture with {@link #takePicture(Camera.ShutterCallback,
           * Camera.PictureCallback, Camera.PictureCallback)}, will not change the
           * lock.</p>
           *
           * <p>Exposure compensation, auto-exposure lock, and auto-white balance
           * lock can be used to capture an exposure-bracketed burst of images,
           * for example.</p>
           *
           * <p>Auto-exposure state, including the lock state, will not be
           * maintained after camera {@link #release()} is called.  Locking
           * auto-exposure after {@link #open()} but before the first call to
           * {@link #startPreview()} will not allow the auto-exposure routine to
           * run at all, and may result in severely over- or under-exposed
           * images.</p>
           *
           * @param toggle new state of the auto-exposure lock. True means that
           *        auto-exposure is locked, false means that the auto-exposure
           *        routine is free to run normally.
           *
           * @see #getAutoExposureLock()
           */
          public void setAutoExposureLock(boolean toggle) {
              set(KEY_AUTO_EXPOSURE_LOCK, toggle ? TRUE : FALSE);
          }
  
          /**
           * Gets the state of the auto-exposure lock. Applications should check
           * {@link #isAutoExposureLockSupported} before using this method. See
           * {@link #setAutoExposureLock} for details about the lock.
           *
           * @return State of the auto-exposure lock. Returns true if
           *         auto-exposure is currently locked, and false otherwise.
           *
           * @see #setAutoExposureLock(boolean)
           *
           */
          public boolean getAutoExposureLock() {
              String str = get(KEY_AUTO_EXPOSURE_LOCK);
              return TRUE.equals(str);
          }
  
          /**
           * Returns true if auto-exposure locking is supported. Applications
           * should call this before trying to lock auto-exposure. See
           * {@link #setAutoExposureLock} for details about the lock.
           *
           * @return true if auto-exposure lock is supported.
           * @see #setAutoExposureLock(boolean)
           *
           */
          public boolean isAutoExposureLockSupported() {
              String str = get(KEY_AUTO_EXPOSURE_LOCK_SUPPORTED);
              return TRUE.equals(str);
          }
  
          /**
           * <p>Sets the auto-white balance lock state. Applications should check
           * {@link #isAutoWhiteBalanceLockSupported} before using this
           * method.</p>
           *
           * <p>If set to true, the camera auto-white balance routine will
           * immediately pause until the lock is set to false.</p>
           *
           * <p>If auto-white balance is already locked, setting this to true
           * again has no effect (the driver will not recalculate white balance
           * values).</p>
           *
           * <p>Stopping preview with {@link #stopPreview()}, or triggering still
           * image capture with {@link #takePicture(Camera.ShutterCallback,
           * Camera.PictureCallback, Camera.PictureCallback)}, will not change the
           * the lock.</p>
           *
           * <p> Changing the white balance mode with {@link #setWhiteBalance}
           * will release the auto-white balance lock if it is set.</p>
           *
           * <p>Exposure compensation, AE lock, and AWB lock can be used to
           * capture an exposure-bracketed burst of images, for example.
           * Auto-white balance state, including the lock state, will not be
           * maintained after camera {@link #release()} is called.  Locking
           * auto-white balance after {@link #open()} but before the first call to
           * {@link #startPreview()} will not allow the auto-white balance routine
           * to run at all, and may result in severely incorrect color in captured
           * images.</p>
           *
           * @param toggle new state of the auto-white balance lock. True means
           *        that auto-white balance is locked, false means that the
           *        auto-white balance routine is free to run normally.
           *
           * @see #getAutoWhiteBalanceLock()
           * @see #setWhiteBalance(String)
           */
          public void setAutoWhiteBalanceLock(boolean toggle) {
              set(KEY_AUTO_WHITEBALANCE_LOCK, toggle ? TRUE : FALSE);
          }
  
          /**
           * Gets the state of the auto-white balance lock. Applications should
           * check {@link #isAutoWhiteBalanceLockSupported} before using this
           * method. See {@link #setAutoWhiteBalanceLock} for details about the
           * lock.
           *
           * @return State of the auto-white balance lock. Returns true if
           *         auto-white balance is currently locked, and false
           *         otherwise.
           *
           * @see #setAutoWhiteBalanceLock(boolean)
           *
           */
          public boolean getAutoWhiteBalanceLock() {
              String str = get(KEY_AUTO_WHITEBALANCE_LOCK);
              return TRUE.equals(str);
          }
  
          /**
           * Returns true if auto-white balance locking is supported. Applications
           * should call this before trying to lock auto-white balance. See
           * {@link #setAutoWhiteBalanceLock} for details about the lock.
           *
           * @return true if auto-white balance lock is supported.
           * @see #setAutoWhiteBalanceLock(boolean)
           *
           */
          public boolean isAutoWhiteBalanceLockSupported() {
              String str = get(KEY_AUTO_WHITEBALANCE_LOCK_SUPPORTED);
              return TRUE.equals(str);
          }
  
          /**
           * Gets current zoom value. This also works when smooth zoom is in
           * progress. Applications should check {@link #isZoomSupported} before
           * using this method.
           *
           * @return the current zoom value. The range is 0 to {@link
           *         #getMaxZoom}. 0 means the camera is not zoomed.
           */
          public int getZoom() {
              return getInt(KEY_ZOOM, 0);
          }
  
          /**
           * Sets current zoom value. If the camera is zoomed (value > 0), the
           * actual picture size may be smaller than picture size setting.
           * Applications can check the actual picture size after picture is
           * returned from {@link PictureCallback}. The preview size remains the
           * same in zoom. Applications should check {@link #isZoomSupported}
           * before using this method.
           *
           * @param value zoom value. The valid range is 0 to {@link #getMaxZoom}.
           */
          public void setZoom(int value) {
              set(KEY_ZOOM, value);
          }
  
          /**
           * Returns true if zoom is supported. Applications should call this
           * before using other zoom methods.
           *
           * @return true if zoom is supported.
           */
          public boolean isZoomSupported() {
              String str = get(KEY_ZOOM_SUPPORTED);
              return TRUE.equals(str);
          }
  
          /**
           * Gets the maximum zoom value allowed for snapshot. This is the maximum
           * value that applications can set to {@link #setZoom(int)}.
           * Applications should call {@link #isZoomSupported} before using this
           * method. This value may change in different preview size. Applications
           * should call this again after setting preview size.
           *
           * @return the maximum zoom value supported by the camera.
           */
          public int getMaxZoom() {
              return getInt(KEY_MAX_ZOOM, 0);
          }
  
          /**
           * Gets the zoom ratios of all zoom values. Applications should check
           * {@link #isZoomSupported} before using this method.
           *
           * @return the zoom ratios in 1/100 increments. Ex: a zoom of 3.2x is
           *         returned as 320. The number of elements is {@link
           *         #getMaxZoom} + 1. The list is sorted from small to large. The
           *         first element is always 100. The last element is the zoom
           *         ratio of the maximum zoom value.
           */
          public List<Integer> getZoomRatios() {
              return splitInt(get(KEY_ZOOM_RATIOS));
          }
  
          /**
           * Returns true if smooth zoom is supported. Applications should call
           * this before using other smooth zoom methods.
           *
           * @return true if smooth zoom is supported.
           */
          public boolean isSmoothZoomSupported() {
              String str = get(KEY_SMOOTH_ZOOM_SUPPORTED);
              return TRUE.equals(str);
          }
  
          /**
           * <p>Gets the distances from the camera to where an object appears to be
           * in focus. The object is sharpest at the optimal focus distance. The
           * depth of field is the far focus distance minus near focus distance.</p>
           *
           * <p>Focus distances may change after calling {@link
           * #autoFocus(AutoFocusCallback)}, {@link #cancelAutoFocus}, or {@link
           * #startPreview()}. Applications can call {@link #getParameters()}
           * and this method anytime to get the latest focus distances. If the
           * focus mode is FOCUS_MODE_CONTINUOUS_VIDEO, focus distances may change
           * from time to time.</p>
           *
           * <p>This method is intended to estimate the distance between the camera
           * and the subject. After autofocus, the subject distance may be within
           * near and far focus distance. However, the precision depends on the
           * camera hardware, autofocus algorithm, the focus area, and the scene.
           * The error can be large and it should be only used as a reference.</p>
           *
           * <p>Far focus distance >= optimal focus distance >= near focus distance.
           * If the focus distance is infinity, the value will be
           * {@code Float.POSITIVE_INFINITY}.</p>
           *
           * @param output focus distances in meters. output must be a float
           *        array with three elements. Near focus distance, optimal focus
           *        distance, and far focus distance will be filled in the array.
           * @see #FOCUS_DISTANCE_NEAR_INDEX
           * @see #FOCUS_DISTANCE_OPTIMAL_INDEX
           * @see #FOCUS_DISTANCE_FAR_INDEX
           */
          public void getFocusDistances(float[] output) {
              if (output == null || output.length != 3) {
                  throw new IllegalArgumentException(
                          "output must be a float array with three elements.");
              }
              splitFloat(get(KEY_FOCUS_DISTANCES), output);
          }
  
          /**
           * Gets the maximum number of focus areas supported. This is the maximum
           * length of the list in {@link #setFocusAreas(List)} and
           * {@link #getFocusAreas()}.
           *
           * @return the maximum number of focus areas supported by the camera.
           * @see #getFocusAreas()
           */
          public int getMaxNumFocusAreas() {
              return getInt(KEY_MAX_NUM_FOCUS_AREAS, 0);
          }
  
          /**
           * <p>Gets the current focus areas. Camera driver uses the areas to decide
           * focus.</p>
           *
           * <p>Before using this API or {@link #setFocusAreas(List)}, apps should
           * call {@link #getMaxNumFocusAreas()} to know the maximum number of
           * focus areas first. If the value is 0, focus area is not supported.</p>
           *
           * <p>Each focus area is a rectangle with specified weight. The direction
           * is relative to the sensor orientation, that is, what the sensor sees.
           * The direction is not affected by the rotation or mirroring of
           * {@link #setDisplayOrientation(int)}. Coordinates of the rectangle
           * range from -1000 to 1000. (-1000, -1000) is the upper left point.
           * (1000, 1000) is the lower right point. The width and height of focus
           * areas cannot be 0 or negative.</p>
           *
           * <p>The weight must range from 1 to 1000. The weight should be
           * interpreted as a per-pixel weight - all pixels in the area have the
           * specified weight. This means a small area with the same weight as a
           * larger area will have less influence on the focusing than the larger
           * area. Focus areas can partially overlap and the driver will add the
           * weights in the overlap region.</p>
           *
           * <p>A special case of a {@code null} focus area list means the driver is
           * free to select focus targets as it wants. For example, the driver may
           * use more signals to select focus areas and change them
           * dynamically. Apps can set the focus area list to {@code null} if they
           * want the driver to completely control focusing.</p>
           *
           * <p>Focus areas are relative to the current field of view
           * ({@link #getZoom()}). No matter what the zoom level is, (-1000,-1000)
           * represents the top of the currently visible camera frame. The focus
           * area cannot be set to be outside the current field of view, even
           * when using zoom.</p>
           *
           * <p>Focus area only has effect if the current focus mode is
           * {@link #FOCUS_MODE_AUTO}, {@link #FOCUS_MODE_MACRO},
           * {@link #FOCUS_MODE_CONTINUOUS_VIDEO}, or
           * {@link #FOCUS_MODE_CONTINUOUS_PICTURE}.</p>
           *
           * @return a list of current focus areas
           */
          public List<Area> getFocusAreas() {
              return splitArea(get(KEY_FOCUS_AREAS));
          }
  
          /**
           * Sets focus areas. See {@link #getFocusAreas()} for documentation.
           *
           * @param focusAreas the focus areas
           * @see #getFocusAreas()
           */
          public void setFocusAreas(List<Area> focusAreas) {
              set(KEY_FOCUS_AREAS, focusAreas);
          }
  
          /**
           * Gets the maximum number of metering areas supported. This is the
           * maximum length of the list in {@link #setMeteringAreas(List)} and
           * {@link #getMeteringAreas()}.
           *
           * @return the maximum number of metering areas supported by the camera.
           * @see #getMeteringAreas()
           */
          public int getMaxNumMeteringAreas() {
              return getInt(KEY_MAX_NUM_METERING_AREAS, 0);
          }
  
          /**
           * <p>Gets the current metering areas. Camera driver uses these areas to
           * decide exposure.</p>
           *
           * <p>Before using this API or {@link #setMeteringAreas(List)}, apps should
           * call {@link #getMaxNumMeteringAreas()} to know the maximum number of
           * metering areas first. If the value is 0, metering area is not
           * supported.</p>
           *
           * <p>Each metering area is a rectangle with specified weight. The
           * direction is relative to the sensor orientation, that is, what the
           * sensor sees. The direction is not affected by the rotation or
           * mirroring of {@link #setDisplayOrientation(int)}. Coordinates of the
           * rectangle range from -1000 to 1000. (-1000, -1000) is the upper left
           * point. (1000, 1000) is the lower right point. The width and height of
           * metering areas cannot be 0 or negative.</p>
           *
           * <p>The weight must range from 1 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 driver
           * will add the weights in the overlap region.</p>
           *
           * <p>A special case of a {@code null} metering area list means the driver
           * is free to meter as it chooses. For example, the driver may use more
           * signals to select metering areas and change them dynamically. Apps
           * can set the metering area list to {@code null} if they want the
           * driver to completely control metering.</p>
           *
           * <p>Metering areas are relative to the current field of view
           * ({@link #getZoom()}). No matter what the zoom level is, (-1000,-1000)
           * represents the top of the currently visible camera frame. The
           * metering area cannot be set to be outside the current field of view,
           * even when using zoom.</p>
           *
           * <p>No matter what metering areas are, the final exposure are compensated
           * by {@link #setExposureCompensation(int)}.</p>
           *
           * @return a list of current metering areas
           */
          public List<Area> getMeteringAreas() {
              return splitArea(get(KEY_METERING_AREAS));
          }
  
          /**
           * Sets metering areas. See {@link #getMeteringAreas()} for
           * documentation.
           *
           * @param meteringAreas the metering areas
           * @see #getMeteringAreas()
           */
          public void setMeteringAreas(List<Area> meteringAreas) {
              set(KEY_METERING_AREAS, meteringAreas);
          }
  
          /**
           * Gets the maximum number of detected faces supported. This is the
           * maximum length of the list returned from {@link FaceDetectionListener}.
           * If the return value is 0, face detection of the specified type is not
           * supported.
           *
           * @return the maximum number of detected face supported by the camera.
           * @see #startFaceDetection()
           */
          public int getMaxNumDetectedFaces() {
              return getInt(KEY_MAX_NUM_DETECTED_FACES_HW, 0);
          }
  
          /**
           * Sets recording mode hint. This tells the camera that the intent of
           * the application is to record videos {@link
           * android.media.MediaRecorder#start()}, not to take still pictures
           * {@link #takePicture(Camera.ShutterCallback, Camera.PictureCallback,
           * Camera.PictureCallback, Camera.PictureCallback)}. Using this hint can
           * allow MediaRecorder.start() to start faster or with fewer glitches on
           * output. This should be called before starting preview for the best
           * result, but can be changed while the preview is active. The default
           * value is false.
           *
           * The app can still call takePicture() when the hint is true or call
           * MediaRecorder.start() when the hint is false. But the performance may
           * be worse.
           *
           * @param hint true if the apps intend to record videos using
           *             {@link android.media.MediaRecorder}.
           */
          public void setRecordingHint(boolean hint) {
              set(KEY_RECORDING_HINT, hint ? TRUE : FALSE);
          }
  
          /**
           * <p>Returns true if video snapshot is supported. That is, applications
           * can call {@link #takePicture(Camera.ShutterCallback,
           * Camera.PictureCallback, Camera.PictureCallback,
           * Camera.PictureCallback)} during recording. Applications do not need
           * to call {@link #startPreview()} after taking a picture. The preview
           * will be still active. Other than that, taking a picture during
           * recording is identical to taking a picture normally. All settings and
           * methods related to takePicture work identically. Ex:
           * {@link #getPictureSize()}, {@link #getSupportedPictureSizes()},
           * {@link #setJpegQuality(int)}, {@link #setRotation(int)}, and etc. The
           * picture will have an EXIF header. {@link #FLASH_MODE_AUTO} and
           * {@link #FLASH_MODE_ON} also still work, but the video will record the
           * flash.</p>
           *
           * <p>Applications can set shutter callback as null to avoid the shutter
           * sound. It is also recommended to set raw picture and post view
           * callbacks to null to avoid the interrupt of preview display.</p>
           *
           * <p>Field-of-view of the recorded video may be different from that of the
           * captured pictures. The maximum size of a video snapshot may be
           * smaller than that for regular still captures. If the current picture
           * size is set higher than can be supported by video snapshot, the
           * picture will be captured at the maximum supported size instead.</p>
           *
           * @return true if video snapshot is supported.
           */
          public boolean isVideoSnapshotSupported() {
              String str = get(KEY_VIDEO_SNAPSHOT_SUPPORTED);
              return TRUE.equals(str);
          }
  
          /**
           * <p>Enables and disables video stabilization. Use
           * {@link #isVideoStabilizationSupported} to determine if calling this
           * method is valid.</p>
           *
           * <p>Video stabilization reduces the shaking due to the motion of the
           * camera in both the preview stream and in recorded videos, including
           * data received from the preview callback. It does not reduce motion
           * blur in images captured with
           * {@link Camera#takePicture takePicture}.</p>
           *
           * <p>Video stabilization can be enabled and disabled while preview or
           * recording is active, but toggling it may cause a jump in the video
           * stream that may be undesirable in a recorded video.</p>
           *
           * @param toggle Set to true to enable video stabilization, and false to
           * disable video stabilization.
           * @see #isVideoStabilizationSupported()
           * @see #getVideoStabilization()
           */
          public void setVideoStabilization(boolean toggle) {
              set(KEY_VIDEO_STABILIZATION, toggle ? TRUE : FALSE);
          }
  
          /**
           * Get the current state of video stabilization. See
           * {@link #setVideoStabilization} for details of video stabilization.
           *
           * @return true if video stabilization is enabled
           * @see #isVideoStabilizationSupported()
           * @see #setVideoStabilization(boolean)
           */
          public boolean getVideoStabilization() {
              String str = get(KEY_VIDEO_STABILIZATION);
              return TRUE.equals(str);
          }
  
          /**
           * Returns true if video stabilization is supported. See
           * {@link #setVideoStabilization} for details of video stabilization.
           *
           * @return true if video stabilization is supported
           * @see #setVideoStabilization(boolean)
           * @see #getVideoStabilization()
           */
          public boolean isVideoStabilizationSupported() {
              String str = get(KEY_VIDEO_STABILIZATION_SUPPORTED);
              return TRUE.equals(str);
          }
  
          // Splits a comma delimited string to an ArrayList of String.
          // Return null if the passing string is null or the size is 0.
          private ArrayList<String> split(String str) {
              if (str == null) return null;
  
              TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
              splitter.setString(str);
              ArrayList<String> substrings = new ArrayList<String>();
              for (String s : splitter) {
                  substrings.add(s);
              }
              return substrings;
          }
  
          // Splits a comma delimited string to an ArrayList of Integer.
          // Return null if the passing string is null or the size is 0.
          private ArrayList<Integer> splitInt(String str) {
              if (str == null) return null;
  
              TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
              splitter.setString(str);
              ArrayList<Integer> substrings = new ArrayList<Integer>();
              for (String s : splitter) {
                  substrings.add(Integer.parseInt(s));
              }
              if (substrings.size() == 0) return null;
              return substrings;
          }
  
          private void splitInt(String str, int[] output) {
              if (str == null) return;
  
              TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
              splitter.setString(str);
              int index = 0;
              for (String s : splitter) {
                  output[index++] = Integer.parseInt(s);
              }
          }
  
          // Splits a comma delimited string to an ArrayList of Float.
          private void splitFloat(String str, float[] output) {
              if (str == null) return;
  
              TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
              splitter.setString(str);
              int index = 0;
              for (String s : splitter) {
                  output[index++] = Float.parseFloat(s);
              }
          }
  
          // Returns the value of a float parameter.
          private float getFloat(String key, float defaultValue) {
              try {
                  return Float.parseFloat(mMap.get(key));
              } catch (NumberFormatException ex) {
                  return defaultValue;
              }
          }
  
          // Returns the value of a integer parameter.
          private int getInt(String key, int defaultValue) {
              try {
                  return Integer.parseInt(mMap.get(key));
              } catch (NumberFormatException ex) {
                  return defaultValue;
              }
          }
  
          // Splits a comma delimited string to an ArrayList of Size.
          // Return null if the passing string is null or the size is 0.
          private ArrayList<Size> splitSize(String str) {
              if (str == null) return null;
  
              TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
              splitter.setString(str);
              ArrayList<Size> sizeList = new ArrayList<Size>();
              for (String s : splitter) {
                  Size size = strToSize(s);
                  if (size != null) sizeList.add(size);
              }
              if (sizeList.size() == 0) return null;
              return sizeList;
          }
  
          // Parses a string (ex: "480x320") to Size object.
          // Return null if the passing string is null.
          private Size strToSize(String str) {
              if (str == null) return null;
  
              int pos = str.indexOf('x');
              if (pos != -1) {
                  String width = str.substring(0, pos);
                  String height = str.substring(pos + 1);
                  return new Size(Integer.parseInt(width),
                                  Integer.parseInt(height));
              }
              Log.e(TAG, "Invalid size parameter string=" + str);
              return null;
          }
  
          // Splits a comma delimited string to an ArrayList of int array.
          // Example string: "(10000,26623),(10000,30000)". Return null if the
          // passing string is null or the size is 0.
          private ArrayList<int[]> splitRange(String str) {
              if (str == null || str.charAt(0) != '('
                      || str.charAt(str.length() - 1) != ')') {
                  Log.e(TAG, "Invalid range list string=" + str);
                  return null;
              }
  
              ArrayList<int[]> rangeList = new ArrayList<int[]>();
              int endIndex, fromIndex = 1;
              do {
                  int[] range = new int[2];
                  endIndex = str.indexOf("),(", fromIndex);
                  if (endIndex == -1) endIndex = str.length() - 1;
                  splitInt(str.substring(fromIndex, endIndex), range);
                  rangeList.add(range);
                  fromIndex = endIndex + 3;
              } while (endIndex != str.length() - 1);
  
              if (rangeList.size() == 0) return null;
              return rangeList;
          }
  
          // Splits a comma delimited string to an ArrayList of Area objects.
          // Example string: "(-10,-10,0,0,300),(0,0,10,10,700)". Return null if
          // the passing string is null or the size is 0 or (0,0,0,0,0).
          @UnsupportedAppUsage
          private ArrayList<Area> splitArea(String str) {
              if (str == null || str.charAt(0) != '('
                      || str.charAt(str.length() - 1) != ')') {
                  Log.e(TAG, "Invalid area string=" + str);
                  return null;
              }
  
              ArrayList<Area> result = new ArrayList<Area>();
              int endIndex, fromIndex = 1;
              int[] array = new int[5];
              do {
                  endIndex = str.indexOf("),(", fromIndex);
                  if (endIndex == -1) endIndex = str.length() - 1;
                  splitInt(str.substring(fromIndex, endIndex), array);
                  Rect rect = new Rect(array[0], array[1], array[2], array[3]);
                  result.add(new Area(rect, array[4]));
                  fromIndex = endIndex + 3;
              } while (endIndex != str.length() - 1);
  
              if (result.size() == 0) return null;
  
              if (result.size() == 1) {
                  Area area = result.get(0);
                  Rect rect = area.rect;
                  if (rect.left == 0 && rect.top == 0 && rect.right == 0
                          && rect.bottom == 0 && area.weight == 0) {
                      return null;
                  }
              }
  
              return result;
          }
  
          private boolean same(String s1, String s2) {
              if (s1 == null && s2 == null) return true;
              if (s1 != null && s1.equals(s2)) return true;
              return false;
          }
      };
  }
  