android获取帧变化区域,如何在Android5.0中实时使用camera2 API获取每个帧数据

我现在正在使用

camera2Basic并试图让每个帧数据进行一些图像处理.我在Android5.0中使用camera2 API,当只进行相机预览并且它是流畅的时候一切都很好.但是当我使用ImageReader.OnImageAvailableListener回调来获取每个帧数据时,预览会停滞不前,这会导致糟糕的用户体验.

以下是我的相关代码：

这是摄像头和ImageReader的设置,我设置的图像格式是YUV_420_888

public Size setUpCameraOutputs(CameraManager cameraManager,Class kClass, int width, int height) {

boolean flagSuccess = true;

try {

for (String cameraId : cameraManager.getCameraIdList()) {

CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraId);

// choose the front or back camera

if (FLAG_CAMERA.BACK_CAMERA == mChosenCamera &&

CameraCharacteristics.LENS_FACING_BACK != characteristics.get(CameraCharacteristics.LENS_FACING)) {

continue;

}

if (FLAG_CAMERA.FRONT_CAMERA == mChosenCamera &&

CameraCharacteristics.LENS_FACING_FRONT != characteristics.get(CameraCharacteristics.LENS_FACING)) {

continue;

}

StreamConfigurationMap map = characteristics.get(

CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);

Size largestSize = Collections.max(

Arrays.asList(map.getOutputSizes(ImageFormat.YUV_420_888)),

new CompareSizesByArea());

mImageReader = ImageReader.newInstance(largestSize.getWidth(), largestSize.getHeight(),

ImageFormat.YUV_420_888, 3);

mImageReader.setOnImageAvailableListener(mOnImageAvailableListener, mBackgroundHandler);

...

mCameraId = cameraId;

}

} catch (CameraAccessException e) {

e.printStackTrace();

} catch (NullPointerException e) {

}

......

}

当相机成功打开时,我创建一个CameraCaptureSession用于相机预览

private void createCameraPreviewSession() {

if (null == mTexture) {

return;

}

// We configure the size of default buffer to be the size of camera preview we want.

mTexture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());

// This is the output Surface we need to start preview

Surface surface = new Surface(mTexture);

// We set up a CaptureRequest.Builder with the output Surface.

try {

mPreviewRequestBuilder =

mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);

mPreviewRequestBuilder.addTarget(mImageReader.getSurface());

mPreviewRequestBuilder.addTarget(surface);

// We create a CameraCaptureSession for camera preview

mCameraDevice.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),

new CameraCaptureSession.StateCallback() {

@Override

public void onConfigured(CameraCaptureSession session) {

if (null == mCameraDevice) {

return;

}

// when the session is ready, we start displaying the preview

mCaptureSession = session;

// Finally, we start displaying the camera preview

mPreviewRequest = mPreviewRequestBuilder.build();

try {

mCaptureSession.setRepeatingRequest(mPreviewRequest,

mCaptureCallback, mBackgroundHandler);

} catch (CameraAccessException e) {

e.printStackTrace();

}

}

@Override

public void onConfigureFailed(CameraCaptureSession session) {

}

}, null);

} catch (CameraAccessException e) {

e.printStackTrace();

}

}

最后一个是ImageReader.OnImageAvailableListener回调

private final ImageReader.OnImageAvailableListener mOnImageAvailableListener = new ImageReader.OnImageAvailableListener() {

@Override

public void onImageAvailable(ImageReader reader) {

Log.d(TAG, "The onImageAvailable thread id: " + Thread.currentThread().getId());

Image readImage = reader.acquireLatestImage();

readImage.close();

}

};

也许我做错了设置,但我尝试了几次,但它不起作用.也许有另一种获取帧数据的方法而不是ImageReader,但我不知道.

有谁知道如何实时获取每个帧数据？