Android相机2 api BufferQueue已被放弃

Question

我正在测试新的Android camera2 API,我希望从相机控制每一帧.我为此做的是创建一个ImageReader并设置分辨率和图像格式.

ImageReader imageReader = ImageReader.newInstance(1280,720,ImageFormat.YUV_420_888,1);
imageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
    @Override
    public void onImageAvailable(ImageReader reader) {
        Image image = reader.acquireLatestImage();
        Log.i(MainActivity.LOG_TAG,"imageReader: "+System.currentTimeMillis());
        image.close();
    }
},null);

之后,我使用参数TEMPLATE_PREVIEW创建新的CaptureRequest并向他添加目标.对于cameraCaptureSession,我使用此请求创建新的setRepeatingRequestimageReader

 try {
    final CaptureRequest.Builder builder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);

    builder.addTarget(imageReader.getSurface());

    mCameraDevice.createCaptureSession(
            Arrays.asList(imageReader.getSurface()),
            new CameraCaptureSession.StateCallback() {
                @Override
                public void onConfigured(CameraCaptureSession session) {
                    mSession = session;
                    try {
                        mSession.setRepeatingRequest(builder.build(),null,null);
                    } catch (CameraAccessException e) {
                        e.printStackTrace();
                    }
                }
                @Override
                public void onConfigureFailed(CameraCaptureSession session) {

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

当我打开相机并开始查看我的预览时,我得到例外.但在异常之前我得到了一些预览图像,之后我有异常

10-30 16:00:32.850    1390-1894/.camera2tutorial E/BufferQueueProducer? [unnamed-1390-1] dequeueBuffer: BufferQueue has been abandoned
10-30 16:00:32.850    1390-1894/.camera2tutorial E/Legacy-CameraDevice-JNI? LegacyCameraDevice_nativeProduceFrame: Error while producing frame No such device (-19).
10-30 16:00:32.850    1390-1894/.camera2tutorial W/SurfaceTextureRenderer? Surface abandoned, dropping frame.
    android.hardware.camera2.legacy.LegacyExceptionUtils$BufferQueueAbandonedException
            at android.hardware.camera2.legacy.LegacyExceptionUtils.throwOnError(LegacyExceptionUtils.java:64)
            at android.hardware.camera2.legacy.LegacyCameraDevice.produceFrame(LegacyCameraDevice.java:516)
            at android.hardware.camera2.legacy.SurfaceTextureRenderer.drawIntoSurfaces(SurfaceTextureRenderer.java:699)
            at android.hardware.camera2.legacy.GLThreadManager$1.handleMessage(GLThreadManager.java:103)
            at android.os.Handler.dispatchMessage(Handler.java:98)
            at android.os.Looper.loop(Looper.java:145)
            at android.os.HandlerThread.run(HandlerThread.java:61)

我怎样才能解决这个问题？？

我使用的是三星Galaxy S5和Android API 21

Answer 1

确保您持有对您创建的ImageReader的引用,可能是您定义mSession的位置.

从ImageReader获得的Surface大致相当于一个弱指针 - 它不会阻止ImageReader收集垃圾.因此很可能(基于您的命名)ImageReader被破坏,然后发生放弃错误.