android: post_processor: Drop return value for process()

PostProcessor::process() is invoked by CameraStream class
in case any post-processing is required for the camera stream.
The failure or success is checked via the value returned by
CameraStream::process().

Now that the post-processor notifies about the post-processing
completion operation, we can drop the return value of
PostProcessor::process(). The status of post-processing is passed
to CameraDevice::streamProcessingComplete() by the
PostProcessor::processComplete signal's slot.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>

src/android/yuv/post_processor_yuv.cpp

@@ -49,21 +49,21 @@ int PostProcessorYuv::configure(const StreamConfiguration &inCfg,
 	return 0;
 }
 
-int PostProcessorYuv::process(Camera3RequestDescriptor::StreamBuffer *streamBuffer)
+void PostProcessorYuv::process(Camera3RequestDescriptor::StreamBuffer *streamBuffer)
 {
 	const FrameBuffer &source = *streamBuffer->srcBuffer;
 	CameraBuffer *destination = streamBuffer->dstBuffer.get();
 
 	if (!isValidBuffers(source, *destination)) {
 		processComplete.emit(streamBuffer, PostProcessor::Status::Error);
-		return -EINVAL;
+		return;
 	}
 
 	const MappedFrameBuffer sourceMapped(&source, MappedFrameBuffer::MapFlag::Read);
 	if (!sourceMapped.isValid()) {
 		LOG(YUV, Error) << "Failed to mmap camera frame buffer";
 		processComplete.emit(streamBuffer, PostProcessor::Status::Error);
-		return -EINVAL;
+		return;
 	}
 
 	int ret = libyuv::NV12Scale(sourceMapped.planes()[0].data(),
@@ -81,12 +81,10 @@ int PostProcessorYuv::process(Camera3RequestDescriptor::StreamBuffer *streamBuff
 	if (ret) {
 		LOG(YUV, Error) << "Failed NV12 scaling: " << ret;
 		processComplete.emit(streamBuffer, PostProcessor::Status::Error);
-		return -EINVAL;
+		return;
 	}
 
 	processComplete.emit(streamBuffer, PostProcessor::Status::Success);
-
-	return 0;
 }
 
 bool PostProcessorYuv::isValidBuffers(const FrameBuffer &source,

src/android/yuv/post_processor_yuv.h

@@ -18,7 +18,7 @@ public:
 
 	int configure(const libcamera::StreamConfiguration &incfg,
 		      const libcamera::StreamConfiguration &outcfg) override;
-	int process(Camera3RequestDescriptor::StreamBuffer *streamBuffer) override;
+	void process(Camera3RequestDescriptor::StreamBuffer *streamBuffer) override;
 
 private:
 	bool isValidBuffers(const libcamera::FrameBuffer &source,