我正在尝试将相机项目更新为Android N,因此将旧的CameraCaptureSession移至ReprocessableCaptureSession.我做到了,它工作正常,但是有了这个新功能,我可以在我的相机中使用CameraDevice.TEMPLATE_ZERO_SHUTTER_LAG模板设备,我可以使用reprocessCaptureRequest重新处理框架.

这是我的问题出现的地方.因为我找不到任何示例,并且我不太了解有关如何使用reprocessCaptureRequest的小文档：

Each reprocess CaptureRequest processes one buffer from CameraCaptureSession’s input Surface to all output Surfaces included in the reprocess capture request. The reprocess input images must be generated from one or multiple output images captured from the same camera device. The application can provide input images to camera device via queueInputImage(Image). The application must use the capture result of one of those output images to create a reprocess capture request so that the camera device can use the information to achieve optimal reprocess image quality. For camera devices that support only 1 output Surface, submitting a reprocess CaptureRequest with multiple output targets will result in a CaptureFailure.

我尝试查看有关google.sources年相机的CTS测试,但它们的功能与我相同.使用多个imageReader,将图片的TotalCaptureResult保存在LinkedBlockingQueue< TotalCaptureResult>中.然后再调用：

TotalCaptureResult totalCaptureResult = state.captureCallback.getTotalCaptureResult();

CaptureRequest.Builder reprocessCaptureRequest = cameraStore.state().cameraDevice.createReprocessCaptureRequest(totalCaptureResult);

reprocessCaptureRequest.addTarget(state.yuvImageReader.getSurface());

sessionStore.state().session.capture(reprocessCaptureRequest.build(), null, this.handlers.bg());

但这总是抛出RuntimeException：

java.lang.RuntimeException：捕获失败：原因170帧中为0,

我只想知道哪种是与ReprocessableCaptureSession一起使用的正确方法,因为我已经尝试了所有方法,而且我不知道自己在做什么错.

解决方法:

最后,我找到了使我的reprocessableCaptureSession工作的解决方案.

我使用Flux体系结构,因此当您看到Dispatcher.dispatch(action)时不要感到困惑,只需将其视为回调即可.所以,这是我的代码：

首先,如何创建会话：

//Configure preview surface

Size previewSize = previewState.previewSize;

previewState.previewTexture.setDefaultBufferSize(previewSize.getWidth(), previewSize.getHeight());

ArrayList targets = new ArrayList<>();

for (SessionOutputTarget outputTarget : state.outputTargets) {

Surface surface = outputTarget.getSurface();

if (surface != null) targets.add(surface);

}

targets.add(previewState.previewSurface);

CameraCharacteristics cameraCharacteristics = cameraStore.state().availableCameras.get(cameraStore.state().selectedCamera);

Size size = CameraCharacteristicsUtil.getYuvOutputSizes(cameraCharacteristics).get(0);

InputConfiguration inputConfiguration = new InputConfiguration(size.getWidth(),

size.getHeight(), ImageFormat.YUV_420_888);

CameraCaptureSession.StateCallback sessionStateCallback = new CameraCaptureSession.StateCallback() {

@Override

public void onConfigured(@NonNull CameraCaptureSession session) {

if (sessionId != currentSessionId) {

Timber.e("Session opened for an old open request, skipping. Current %d, Request %d", currentSessionId, sessionId);

//performClose(session);

return;

}

try {

session.getInputSurface();

//This call is irrelevant,

//however session might have closed and this will throw an IllegalStateException.

//This happens if another camera app (or this one in another PID) takes control

//of the camera while its opening

} catch (IllegalStateException e) {

Timber.e("Another process took control of the camera while creating the session, aborting!");

}

Dispatcher.dispatchOnUi(new SessionOpenedAction(session));

}

@Override

public void onConfigureFailed(@NonNull CameraCaptureSession session) {

if (sessionId != currentSessionId) {

Timber.e("Configure failed for an old open request, skipping. Current %d, request %d", currentSessionId, sessionId);

return;

}

Timber.e("Failed to configure the session");

Dispatcher.dispatchOnUi(new SessionFailedAction(session, new IllegalStateException("onConfigureFailed")));

}

};

if (state.outputMode == OutputMode.PHOTO) {

cameraState.cameraDevice.createReprocessableCaptureSession(inputConfiguration, targets, sessionStateCallback, handlers.bg());

} else if (state.outputMode == OutputMode.VIDEO) {

cameraState.cameraDevice.createCaptureSession(targets, sessionStateCallback, handlers.bg());

}

} catch (IllegalStateException | IllegalArgumentException e) {

Timber.e(e, "Something went wrong trying to start the session");

} catch (CameraAccessException e) {

//Camera will throw CameraAccessException if another we try to open / close the

//session very fast.

Timber.e("Failed to access camera, it was closed");

}

使用4个表面(预览,YUV(输入),JPEG和RAW)创建的照片会话.之后,我配置了imageWriter：

Dispatcher.subscribe(Dispatcher.VERY_HIGH_PRIORITY, SessionOpenedAction.class)

.filter(a -> isInPhotoMode())

.subscribe(action -> {

PhotoState newState = new PhotoState(state());

newState.zslImageWriter = ImageWriter.newInstance(action.session.getInputSurface(), MAX_REPROCESS_IMAGES);

setState(newState);

});

好的,现在我们已经创建了ImageWriter和会话.不,我们从重复请求开始流式传输：

CaptureRequest.Builder captureRequestBuilder =

cameraStore.state().cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_ZERO_SHUTTER_LAG);

captureRequestBuilder.addTarget(previewStore.state().previewSurface);

captureRequestBuilder.addTarget(photoStore.state().yuvImageReader.getSurface());

state.session.setRepeatingRequest(captureRequestBuilder.build(), state.zslCaptureCallback, handlers.bg());

要添加大量代码,只需说zslCaptureCallback是自定义回调,它保存在LinkedBlockingQueue< TotalCaptureRequest>中. X个最后的TotalCaptureRequests.另外,我对yuvImageReader(输入一个)进行了同样的操作,将最后的X个图像保存在队列中.

最后是我的“拍照”方法：

try {

//Retrieve the last image stored by the zslImageReader

Image image = zslImageReaderListener.getImage();

//Retrieve the last totalCaptureResult from the zslCaptureCallback and create a reprocessableCaptureRequest with it

TotalCaptureResult captureResult = sessionStore.state().zslCaptureCallback.getCaptureResult(image.getTimestamp());

CaptureRequest.Builder captureRequest = cameraStore.state().cameraDevice.createReprocessCaptureRequest(captureResult);

//Add the desired target and values to the captureRequest

captureRequest.addTarget(state().jpegImageReader.getSurface());

//Queued back to ImageWriter for future consumption.

state.zslImageWriter.queueInputImage(image);

//Drain all the unused and queued CapturedResult from the CaptureCallback

sessionStore.state().zslCaptureCallback.drain();

//Capture the desired frame

CaptureRequest futureCaptureResult = captureRequest.build();

sessionStore.state().session.capture(futureCaptureResult, new CameraCaptureSession.CaptureCallback() {

@Override

public void onCaptureCompleted(@NonNull CameraCaptureSession session,

@NonNull CaptureRequest request,

@NonNull TotalCaptureResult result) {

Dispatcher.dispatchOnUi(new PhotoStatusChangedAction(PhotoState.Status.SUCCESS));

}

@Override

public void onCaptureFailed(@NonNull CameraCaptureSession session,

@NonNull CaptureRequest request,

@NonNull CaptureFailure failure) {

super.onCaptureFailed(session, request, failure);

Exception captureFailedException = new RuntimeException(

String.format("Capture failed: Reason %s in frame %d, was image captured? -> %s",

failure.getReason(),

failure.getFrameNumber(),

failure.wasImageCaptured()));

Timber.e(captureFailedException, "Cannot take mediaType, capture failed!");

Dispatcher.dispatchOnUi(new PhotoStatusChangedAction(PhotoState.Status.ERROR, captureFailedException));

}

}, this.handlers.bg());

//Capture did not blow up, we are taking the photo now.

newState.status = PhotoState.Status.TAKING;

} catch (CameraAccessException | InterruptedException| IllegalStateException | IllegalArgumentException | SecurityException e) {

Timber.e(e, "Cannot take picture, capture error!");

newState.status = PhotoState.Status.ERROR;

}

标签：android-camera2,image,camera,java,android

来源： https://codeday.me/bug/20191112/2023478.html