具有多路输出的Camera2

Question

这里是我的问题，我目前无法填充3个表面中的一个仍然从Camera2API捕获的图像后调用捕获。我使用Google Camera2入门（需要链接）来设置样板，所以这段代码的大部分看起来可能很熟悉。

Camera2捕获声明：

每个请求将生成一个CaptureResult，并为一个或多个目标曲面生成新的框架，使用CaptureRequest构建器的addTarget（Surface）方法设置。目标曲面（用addTarget（Surface）设置）必须是创建此捕获会话时提供的曲面的子集。

// in order to use a surface they must be registered when creating the session
List<Surface> surfaces = new ArrayList<>(previewSurfaces); //size + 1
surfaces.addAll(displaySurfaces); // size + 1
surfaces.add(mImageReader.getSurface()); //size + 1
try {
    mCameraDevice.createCaptureSession(surfaces, mCaptureSessionCallback , null);
 ...

// Add the display surfaces along with the internal image reader
captureBuilder.addTarget(mImageReader.getSurface());
for(Surface surface : this.displaySurfaces) {
     captureBuilder.addTarget(surface);  //theres only one
}
CaptureRequest captureRequest = captureBuilder.build();
mCaptureSession.capture(captureRequest, captureCallback, mBackgroundHandler);

下面是表面是如何生成的；

private SurfaceView getPreviewView(Context context) throws CameraAccessException {
        // TODO set z overlay?
        Size previewSize = mCameraController.determineLargestSize();
        Log.d(LOG_TAG, "Setting preview dimensions to: \n" +
            "width: " + Integer.toString(previewSize.getWidth()) + "\n" +
            "height " + Integer.toString(previewSize.getHeight()));
        SurfaceView view = new SurfaceView(context);
        view.getHolder().addCallback(mPreviewViewCallback);
        view.getHolder().setFixedSize(previewSize.getWidth(),previewSize.getHeight());
        view.setOnTouchListener(mZoomFocusListener);
        return view;
    }

private SurfaceView getDisplayTile(Context context) throws CameraAccessException {
        SurfaceView previewTile = new SurfaceView(context);
        Size smallest = mCameraController.determineSmallestSize();
        int width = smallest.getWidth();
        int height = smallest.getHeight();
        Log.d(LOG_TAG, "Setting display tile dimensions to: \n" +
                "width: " + Integer.toString(smallest.getWidth()) + "\n" +
                "height " + Integer.toString(smallest.getHeight()));
        previewTile.getHolder().addCallback(mDisplayCallback);
        previewTile.getHolder().setFixedSize(width,height);
        previewTile.setZOrderMediaOverlay(true);
        previewTile.getHolder().setFormat(PixelFormat.TRANSLUCENT);
        previewTile.setBackgroundColor(Color.BLUE);
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(width,height);
        params.addRule(RelativeLayout.ALIGN_PARENT_TOP);
        params.addRule(RelativeLayout.ALIGN_PARENT_END);
        params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
        params.setMargins(7,7,7,7);
        previewTile.setLayoutParams(params);
        return previewTile;
    }

这就是我如何把一切都聚集在一起

private void initViews(Context context) throws CameraAccessException {
        mFrameLayout = new FrameLayout(context);
        // Add the view for the camera preview
        FrameLayout.LayoutParams surfaceParams = new FrameLayout.LayoutParams(
                FrameLayout.LayoutParams.MATCH_PARENT,
                FrameLayout.LayoutParams.MATCH_PARENT);
        mPreviewView = this.getPreviewView(context);
        mFrameLayout.addView(mPreviewView,surfaceParams);

        // Add the preview tile to the layout
        FrameLayout.LayoutParams displayParams = new FrameLayout.LayoutParams(
                FrameLayout.LayoutParams.WRAP_CONTENT,
                FrameLayout.LayoutParams.WRAP_CONTENT);
        displayParams.gravity = Gravity.BOTTOM | Gravity.RIGHT;
        RelativeLayout layout = new RelativeLayout(context);
        mCapturedTile = this.getDisplayTile(context);
        layout.addView(mCapturedTile);
        mFrameLayout.addView(layout, displayParams);
}

我还附上了Logcat，让你知道发生了什么

12-19 16:00:33.185 29863-29863/ngc.com.camera2app I/CameraController: This device has 2 available cameras
12-19 16:00:33.202 29863-29863/ngc.com.camera2app D/CameraController: Retrieveing current crop region
12-19 16:00:33.206 29863-29863/ngc.com.camera2app D/CameraView: Setting preview dimensions to: 
                                                                width: 3264
                                                                height 2448
12-19 16:00:33.208 29863-29863/ngc.com.camera2app D/CameraView: Setting display tile dimensions to: 
                                                                width: 176
                                                                height 144
12-19 16:00:33.948 29863-29863/ngc.com.camera2app D/CameraView: Surface created
12-19 16:00:33.949 29863-29863/ngc.com.camera2app D/CameraView: preview surface changed dimensions are
12-19 16:00:33.950 29863-29863/ngc.com.camera2app D/CameraView: width : 3264 | height : 2448
12-19 16:00:33.964 29863-29863/ngc.com.camera2app D/CameraView: Surface created
12-19 16:00:33.964 29863-29863/ngc.com.camera2app D/CameraView: display surface changed dimensions are
12-19 16:00:33.964 29863-29863/ngc.com.camera2app D/CameraView: width : 176 | height : 144
12-19 16:00:33.973 29863-29863/ngc.com.camera2app I/CameraController: Attempting to open camera
12-19 16:00:34.048 29863-29929/ngc.com.camera2app I/CameraController: Camera 0 is open for business
12-19 16:00:34.055 29863-29863/ngc.com.camera2app W/PathParser: Points are too far apart 4.000000596046461
12-19 16:00:34.065 29863-29929/ngc.com.camera2app D/CameraView: Camera ready
12-19 16:00:48.343 29863-29929/ngc.com.camera2app I/CameraController: Image available

private synchronized void openCamera(){
        if(displayReady && previewReady){
            try {
                List<Surface> displaySurfaces = new ArrayList<>();
                //uncommenting this line adds a nasty bug
                displaySurfaces.add(mPreviewView.getHolder().getSurface());

                List<Surface> previewSurfaces = new ArrayList<>();
                previewSurfaces.add(mCapturedTile.getHolder().getSurface());

                mCameraController.openCamera(displaySurfaces, previewSurfaces);
            } catch (CameraAccessException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

Answer 1

谢谢@eddytalvala，原来这个问题是由于分辨率不匹配。预览面：3264 x 2446显示面：176 x 148

我在中间会面，将这两项决议都改为640,480项，这解决了问题。