问题描述
我正在尝试更新摄像头proyect到Android N并且在连续性中移动我的旧到。我做到了它工作正常，但有了这个新功能，我可以在我的设备中使用 CameraDevice.TEMPLATE_ZERO_SHUTTER_LAG 模板，我可以使用。
I'm trying to update a camera proyect to Android N and in consecuense Im moving my old CameraCaptureSession to a ReprocessableCaptureSession. I did it and it is working fine, but with this new feature I can use the CameraDevice.TEMPLATE_ZERO_SHUTTER_LAG template in my device and I can reprocess frames with the reprocessCaptureRequest.
这是我的问题出现的地方。因为我没有找到任何示例，我真的不明白有关如何使用 reprocessCaptureRequest 的小文档：
Here is where my problem appear. Cause I don't find any example,and I don't really understand the little documentation about how to use a reprocessCaptureRequest:
我试过在但他们做的与我相同。使用倍数imageReaders，在 LinkedBlockingQueue< TotalCaptureResult> 中保存图片的 TotalCaptureResult 然后只需调用：
I tried to have a look to the CTS tests about the camera in google.sources but they do the same than me. Using multiples imageReaders, saving the TotalCaptureResult of the pictures in a LinkedBlockingQueue<TotalCaptureResult> And later just calling:
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());
但它总是给我一个RuntimeException：
java.lang .RuntimeException：捕获失败：第170帧中的原因0，
But it always throw me a RuntimeException:java.lang.RuntimeException: Capture failed: Reason 0 in frame 170,
我只是不知道哪种方法适合使用ReprocessableCaptureSession因为我已经尝试了一切，我不知道我做错了什么。希望有人能够帮助我！
I just wan't to know which is the right way to work with the ReprocessableCaptureSession cause I already tried everything and I don't know what I'm doing wrong. Hope that someone will be able to help me!
非常感谢
推荐答案
最后我找到了使 reprocessableCaptureSession 工作的解决方案。
我使用Flux架构，所以当你看到 Dispatcher.dispatch（action）时不要混淆，只是把它看作一个回调。所以，这是我的代码：
Finally I found the solution to make my reprocessableCaptureSession work.I use with Flux architecture so don't be confused when you see Dispatcher.dispatch(action), just see it as a callback. So, here is my code:
首先如何创建会话：
//Configure preview surface
Size previewSize = previewState.previewSize;
previewState.previewTexture.setDefaultBufferSize(previewSize.getWidth(), previewSize.getHeight());
ArrayList<Surface> 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个曲面创建的照片会话（预览，YUV（输入）， JPEG和RAW）。之后，我配置了我的imageWriter：
Photo session as been created with 4 surfaces(Preview, YUV(input), JPEG and RAW). After it, I configure my 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，我们用重复请求开始流式传输：
Ok, now we have the ImageWriter and the session created. No we start the streaming with the repeating request:
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());
要不添加大量代码，只需说zslCaptureCallback是自定义回调即可保存在 LinkedBlockingQueue< TotalCaptureRequest> X最后的TotalCaptureRequests。另外，我使用yuvImageReader（输入一个）保存队列中的最后X个图像。
To don't add a lot of code, just say that the zslCaptureCallback is a custom callback which save in a LinkedBlockingQueue<TotalCaptureRequest> the X last TotalCaptureRequests. Also, I do the same with the yuvImageReader(input one) saving the last X images in a queue.
最后这是我的拍照方法：
Finally here is my "take photo" method:
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;
}
这篇关于如何在camera2 API中使用reprocessCaptureRequest的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！