Camera2 Session 不支持 MediaCodec 的持久输入表面?

MediaCodec's Persistent Input Surface unsupported by Camera2 Session?

我正在编写一个 Android 应用程序,它支持保存 RAW/JPEG 并同时录制视频。我在创建 CameraCaptureSession 时尝试传递 4 个表面:预览、由 MediaCodec#createPersistentInputSurface 创建的 2x ImageSaver 和 1x PersistentInputSurface。通过使用持久输入表面,我打算避免 2 次捕获之间的中断。

创建会话时失败:

W/CameraDevice-JV-0: Stream configuration failed due to: endConfigure:380: Camera 0: Unsupported set of inputs/outputs provided
Session 0: Failed to create capture session; configuration failed

我试过去掉所有其他表面,只留下PersistentInputSurface,仍然失败。

 @Override
    public void onResume() {
        super.onResume();

        //Some other setups...

        if (persistentRecorderSurface == null) {
            persistentRecorderSurface = MediaCodec.createPersistentInputSurface();
        }

        startBackgroundThread();
        startCamera();

        if (mPreviewView.isAvailable()) {
            configureTransform(mPreviewView.getWidth(), mPreviewView.getHeight());
        } else {
            mPreviewView.setSurfaceTextureListener(mSurfaceTextureListener);
        }
        if (mOrientationListener != null && mOrientationListener.canDetectOrientation()) {
            mOrientationListener.enable();
        }
    }

    private void createCameraPreviewSessionLocked() {
        try {

            SurfaceTexture texture = mPreviewView.getSurfaceTexture();
            texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
            Surface surface = new Surface(texture);

            mPreviewRequestBuilder = mBackCameraDevice.createCaptureRequest(
                    CameraDevice.TEMPLATE_PREVIEW);
            mPreviewRequestBuilder.addTarget(surface);

            mBackCameraDevice.createCaptureSession(Arrays.asList(
                                surface,
                                mJpegImageReader.get().getSurface(),
                                mRAWImageReader.get().getSurface(),
                                persistentRecorderSurface
                        ), new CameraCaptureSession.StateCallback() {

                    @Override
                    public void onConfigured(CameraCaptureSession session) {
                        synchronized (mCameraStateLock) {
                            if (mBackCameraDevice == null) {
                                return;
                            }

                            try {
                                setup3AControlsLocked(mPreviewRequestBuilder);

                                session.setRepeatingRequest(mPreviewRequestBuilder.build(),
                                        mPreCaptureCallback, mBackgroundHandler);
                                mState = CameraStates.PREVIEW;
                            } catch (CameraAccessException | IllegalStateException e) {
                                e.printStackTrace();
                                return;
                            }

                            mSession = session;
                        }
                    }

                    @Override
                    public void onConfigureFailed(CameraCaptureSession session) {
                        showToast("Failed to configure camera.");
                    }
                }, mBackgroundHandler);

        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

查看错误行之前的系统日志行以进行确认会很有帮助,但最有可能的是:

您需要实际将 persistentRecorderSurface 绑定到 MediaRecorder or MediaCodec,并在创建相机捕获会话之前对其调用 prepare()。

否则,持久表面的另一端实际上什么也没有,相机无法判断需要什么分辨率或其他设置。

另请注意,根据相机支持的硬件级别和功能,您可以从相机获得的并发输出数量是有限的。目前没有要求设备必须支持您的输出组合(预览、记录、JPEG、RAW),不幸的是,所以很可能许多或所有设备仍然会给您一个错误。