android.hardware.Camera#PreviewCallback ( )源码实例Demo

public void setPreviewCallback(Camera.PreviewCallback previewCallback) {
  this.previewCallback = previewCallback;

  if (isOpen()) {
    openCamera.getCamera().setPreviewCallback(previewCallback);
  }
}
 

public void setPreviewCallback(Camera.PreviewCallback previewCallback) {
  this.previewCallback = previewCallback;

  if (isOpen()) {
    openCamera.getCamera().setPreviewCallback(previewCallback);
  }
}
 

public void setPreviewCallback(Camera.PreviewCallback callback){
    cameraInfo.camera.setPreviewCallback(callback);
}
 

@Override
public void setOneShotPreviewCallback(Camera.PreviewCallback cb) {
    camera.setOneShotPreviewCallback(cb);
}
 

public void setPreviewCallbackWithBuffer(Camera.PreviewCallback callback) {
    _handler.obtainMessage(SET_PREVIEW_CALLBACK_WITH_BUFFER, callback).sendToTarget();
}
 

@Override
public void setPreviewCallback(Camera.PreviewCallback cb) {
    camera.setPreviewCallback(cb);
}
 

public void setCamera(CameraWrapper cameraWrapper, Camera.PreviewCallback previewCallback) {
    mCameraWrapper = cameraWrapper;
    mPreviewCallback = previewCallback;
}
 

public void setOneShotPreviewCallback(Camera.PreviewCallback callback) {
  if(mCamera != null) {
    mCamera.setOneShotPreviewCallback(callback);
  }
}
 

@Override
public void setCameraPreview(Camera.PreviewCallback previewCallback) {
    mCamera.setPreviewCallback(previewCallback);
}
 

public CameraPreview(Context context, AttributeSet attrs, Camera camera, Camera.PreviewCallback previewCallback) {
    super(context, attrs);
    init(camera, previewCallback);
}
 

@Override
public void setOneShotPreviewCallback(Camera.PreviewCallback cb) {
    camera.setOneShotPreviewCallback(cb);
}
 

/**
 * 开始检测脸
 */
public void actionDetect(Camera.PreviewCallback mActivity) {
	if (mCamera != null) {
		mCamera.setPreviewCallback(mActivity);
	}
}
 

/**
 * Video encoding is done by a MediaCodec.
 */
@SuppressLint("NewApi")
protected void encodeWithMediaCodecMethod1() throws RuntimeException, IOException {

	Log.d(TAG,"Video encoded using the MediaCodec API with a buffer");

	// Updates the parameters of the camera if needed
	createCamera();
	updateCamera();

	// Estimates the framerate of the camera
	measureFramerate();

	// Starts the preview if needed
	if (!mPreviewStarted) {
		try {
			mCamera.startPreview();
			mPreviewStarted = true;
		} catch (RuntimeException e) {
			destroyCamera();
			throw e;
		}
	}

	EncoderDebugger debugger = EncoderDebugger.debug(mSettings, mQuality.resX, mQuality.resY);
	final NV21Convertor convertor = debugger.getNV21Convertor();

	mMediaCodec = MediaCodec.createByCodecName(debugger.getEncoderName());
	MediaFormat mediaFormat = MediaFormat.createVideoFormat("video/avc", mQuality.resX, mQuality.resY);
	mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, mQuality.bitrate);
	mediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, mQuality.framerate);	
	mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT,debugger.getEncoderColorFormat());
	mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 1);
	mMediaCodec.configure(mediaFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
	mMediaCodec.start();

	Camera.PreviewCallback callback = new Camera.PreviewCallback() {
		long now = System.nanoTime()/1000, oldnow = now, i=0;
		ByteBuffer[] inputBuffers = mMediaCodec.getInputBuffers();
		@Override
		public void onPreviewFrame(byte[] data, Camera camera) {
			oldnow = now;
			now = System.nanoTime()/1000;
			if (i++>3) {
				i = 0;
				//Log.d(TAG,"Measured: "+1000000L/(now-oldnow)+" fps.");
			}
			try {
				int bufferIndex = mMediaCodec.dequeueInputBuffer(500000);
				if (bufferIndex>=0) {
					inputBuffers[bufferIndex].clear();
					convertor.convert(data, inputBuffers[bufferIndex]);
					mMediaCodec.queueInputBuffer(bufferIndex, 0, inputBuffers[bufferIndex].position(), now, 0);
				} else {
					Log.e(TAG,"No buffer available !");
				}
			} finally {
				mCamera.addCallbackBuffer(data);
			}				
		}
	};

	for (int i=0;i<10;i++) mCamera.addCallbackBuffer(new byte[convertor.getBufferSize()]);
	mCamera.setPreviewCallbackWithBuffer(callback);

	// The packetizer encapsulates the bit stream in an RTP stream and send it over the network
	mPacketizer.setDestination(mDestination, mRtpPort, mRtcpPort);
	mPacketizer.setInputStream(new MediaCodecInputStream(mMediaCodec));
	mPacketizer.start();

	mStreaming = true;

}
 

/**
 * 响应预览图像
 *
 * @param previewCallback
 */
public void requestPreview(Camera.PreviewCallback previewCallback) {
    if (mCamera != null)
        mCamera.setOneShotPreviewCallback(previewCallback);
}
 

/**
* See <a href="http://developer.android.com/reference/android/hardware/Camera.html#setPreviewCallbackWithBuffer%28android.hardware.Camera.PreviewCallback%29">Camera.setPreviewCallbackWithBuffer(..)</a>
*/
  void setPreviewCallbackWithBuffer(Camera.PreviewCallback cb);
 

/**
* See <a href="http://developer.android.com/reference/android/hardware/Camera.html#setOneShotPreviewCallback%28android.hardware.Camera.PreviewCallback%29">Camera.setOneShotPreviewCallback(..)</a>
*/
  void setOneShotPreviewCallback(Camera.PreviewCallback cb);
 

/**
* See <a href="http://developer.android.com/reference/android/hardware/Camera.html#setPreviewCallback%28android.hardware.Camera.PreviewCallback%29">Camera.setPreviewCallback(..)</a>
*/
  void setPreviewCallback(Camera.PreviewCallback cb);
 

/**
* See <a href="http://developer.android.com/reference/android/hardware/Camera.html#setPreviewCallback%28android.hardware.Camera.PreviewCallback%29">Camera.setPreviewCallback(..)</a>
*/
  void setPreviewCallback(Camera.PreviewCallback cb);
 

/**
* See <a href="http://developer.android.com/reference/android/hardware/Camera.html#setOneShotPreviewCallback%28android.hardware.Camera.PreviewCallback%29">Camera.setOneShotPreviewCallback(..)</a>
*/
  void setOneShotPreviewCallback(Camera.PreviewCallback cb);
 

void setCameraPreview(Camera.PreviewCallback previewCallback);