我现在正在使用camera2Basic工作,试图获取每帧数据进行图像处理。我在Android 5.0中使用相机2 API,在仅进行相机预览时一切正常且流畅。但是当我使用
最后一个是
ImageReader.OnImageAvailableListener
回调来获取每帧数据时,预览会卡顿,这会导致糟糕的用户体验。
以下是我的相关代码:
这是相机和ImageReader的设置,我将图像格式设置为YUV_420_888
public<T> Size setUpCameraOutputs(CameraManager cameraManager,Class<T> 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) {
}
......
}
当相机成功打开后,我会创建一个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
回调函数。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();
}
};
也许我设置有误,但我尝试了几次,它没有起作用。也许除了ImageReader之外还有其他获取帧数据的方法,但我不知道。 有人知道如何实时获取每个帧的数据吗?