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/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,