content: /*
   *  UVCCamera
   *  library and sample to access to UVC web camera on non-rooted Android device
   *
   * Copyright (c) 2014-2017 saki t_saki@serenegiant.com
   *
   *  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.
   *
   *  All files in the folder are under this Apache License, Version 2.0.
   *  Files in the libjpeg-turbo, libusb, libuvc, rapidjson folder
   *  may have a different license, see the respective files.
   */
  package com.serenegiant.usb;
  
  import java.nio.ByteBuffer;
  
  /**
   * Callback interface for UVCCamera class
   * If you need frame data as ByteBuffer, you can use this callback interface with UVCCamera#setFrameCallback
   */
  public interface IFrameCallback {
  	/**
  	 * This method is called from native library via JNI on the same thread as UVCCamera#startCapture.
  	 * You can use both UVCCamera#startCapture and #setFrameCallback
  	 * but it is better to use either for better performance.
  	 * You can also pass pixel format type to UVCCamera#setFrameCallback for this method.
  	 * Some frames may drops if this method takes a time.
  	 * When you use some color format like NV21, this library never execute color space conversion,
  	 * just execute pixel format conversion. If you want to get same result as on screen, please try to
  	 * consider to get images via texture(SurfaceTexture) and read pixel buffer from it using OpenGL|ES2/3
  	 * instead of using IFrameCallback(this way is much efficient in most case than using IFrameCallback).
  	 *
  	 * @param frame this is direct ByteBuffer from JNI layer and you should handle it's byte order and limitation.
  	 */
  	void onFrame(ByteBuffer frame);
  }
  