Question

我试图将我的Android应用与OpenCV库连接，我需要使用原生相机来更好地控制相机选项。为此，我找到了http://nezarobot.blogspot.it/2016/03/android-surfacetexture-camera2-opencv.html，这就是我需要的。我的问题是，如果我使用此代码，进行一些小的更改，当我启动它时，我的应用程序崩溃并报告了3个错误：

E / BufferQueueProducer：[SurfaceTexture-0-31525-0] connect（P）：已连接（cur = 4 req = 2）
D / PlateNumberDetection / DetectionBasedTracker：ANativeWindow_lock失败，错误代码为-22
A / libc：致命信号11（SIGSEGV），代码1，故障地址0x315e9858 in tid 31735（CameraBackgroun）

我试图在jni调用之前关闭相机并且我可以捕获并仅显示第一帧，但是我需要重新启动相机并且我不能自己创建相同的线程。

在这里，我将框架发送给NDK。

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

    @Override
    public void onImageAvailable(ImageReader reader) {

        Image image;

        try {
            image = reader.acquireLatestImage();
            if( image == null) {
                return;
            }



            if (image.getFormat() != ImageFormat.YUV_420_888) {
                throw new IllegalArgumentException("image must have format YUV_420_888.");
            }

            Image.Plane[] planes = image.getPlanes();

            if (planes[1].getPixelStride() != 1 && planes[1].getPixelStride() != 2) {
                throw new IllegalArgumentException(
                        "src chroma plane must have a pixel stride of 1 or 2: got "
                                + planes[1].getPixelStride());
            }

            mNativeDetector.detect(image.getWidth(), image.getHeight(), planes[0].getBuffer(), surface);


        } catch (IllegalStateException e) {
            Log.e(TAG, "Too many images queued for saving, dropping image for request: ", e);
            return;
        }
        image.close();
    }
};

在这里我管理相机预览

protected void createCameraPreview() {
    try {
        SurfaceTexture texture = textureView.getSurfaceTexture();
        assert texture != null;
        texture.setDefaultBufferSize(imageDimension.getWidth(), imageDimension.getHeight());
        surface = new Surface(texture);
        captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        captureRequestBuilder.addTarget(mImageReader.get().getSurface());

        BlockingSessionCallback sessionCallback = new BlockingSessionCallback();

        List<Surface> outputSurfaces = new ArrayList<>();
        outputSurfaces.add(mImageReader.get().getSurface());
        outputSurfaces.add(new Surface(textureView.getSurfaceTexture()));

        cameraDevice.createCaptureSession(outputSurfaces, sessionCallback, mBackgroundHandler);

        try {
            Log.d(TAG, "waiting on session.");
            cameraCaptureSessions = sessionCallback.waitAndGetSession(SESSION_WAIT_TIMEOUT_MS);
            try {
                captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CaptureRequest.CONTROL_MODE_AUTO);


                Log.d(TAG, "setting repeating request");

                cameraCaptureSessions.setRepeatingRequest(captureRequestBuilder.build(),
                        mCaptureCallback, mBackgrounHandler);
            } catch (CameraAccessException e) {
                e.printStackTrace();
            }
        } catch (TimeoutRuntimeException e) {
            Toast.makeText(AydaMainActivity.this, "Failed to configure capture session.", Toast.LENGTH_SHORT);
        }

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

Answer 1

您是否先尝试过该代码而不进行“一些小改动”？我尝试过这个项目，它在多个设备上运行良好。因此，首先确定它是否完全不适用于您的手机，或者您的修改中存在问题。

Android的openCV表面：已连接

1 个答案: