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/camera_stream.cpp

@@ -191,7 +191,9 @@ int CameraStream::process(Camera3RequestDescriptor::StreamBuffer *streamBuffer)
 		return -EINVAL;
 	}
 
-	return postProcessor_->process(streamBuffer);
+	postProcessor_->process(streamBuffer);
+
+	return 0;
 }
 
 FrameBuffer *CameraStream::getBuffer()

src/android/jpeg/post_processor_jpeg.cpp

@@ -98,7 +98,7 @@ void PostProcessorJpeg::generateThumbnail(const FrameBuffer &source,
 	}
 }
 
-int PostProcessorJpeg::process(Camera3RequestDescriptor::StreamBuffer *streamBuffer)
+void PostProcessorJpeg::process(Camera3RequestDescriptor::StreamBuffer *streamBuffer)
 {
 	ASSERT(encoder_);
 
@@ -199,7 +199,7 @@ int PostProcessorJpeg::process(Camera3RequestDescriptor::StreamBuffer *streamBuf
 	if (jpeg_size < 0) {
 		LOG(JPEG, Error) << "Failed to encode stream image";
 		processComplete.emit(streamBuffer, PostProcessor::Status::Error);
-		return jpeg_size;
+		return;
 	}
 
 	/* Fill in the JPEG blob header. */
@@ -213,6 +213,4 @@ int PostProcessorJpeg::process(Camera3RequestDescriptor::StreamBuffer *streamBuf
 	/* Update the JPEG result Metadata. */
 	resultMetadata->addEntry(ANDROID_JPEG_SIZE, jpeg_size);
 	processComplete.emit(streamBuffer, PostProcessor::Status::Success);
-
-	return 0;
 }

src/android/jpeg/post_processor_jpeg.h

@@ -22,7 +22,7 @@ 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:
 	void generateThumbnail(const libcamera::FrameBuffer &source,

src/android/post_processor.h

@@ -27,7 +27,7 @@ public:
 
 	virtual int configure(const libcamera::StreamConfiguration &inCfg,
 			      const libcamera::StreamConfiguration &outCfg) = 0;
-	virtual int process(Camera3RequestDescriptor::StreamBuffer *streamBuffer) = 0;
+	virtual void process(Camera3RequestDescriptor::StreamBuffer *streamBuffer) = 0;
 
 	libcamera::Signal<Camera3RequestDescriptor::StreamBuffer *, Status> processComplete;
 };

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,