[libcamera-devel] [PATCH v1 2/6] android: post_processor: Notify post processing completion status

[Umang Jain]

We should be able to know if post-processing has been completed
successfully or encountered some errors. This commit introduces a
Signal<> which when connected, will notify that the post-processing
has been completed. The status of PostProcessor::process() will be
passed as a PostProcessor::Status argument. The signal will be required
when the post-processor is meant to run asynchronously (in subsequent
commits).

Signed-off-by: Umang Jain <umang.jain at ideasonboard.com>
---
 src/android/jpeg/post_processor_jpeg.cpp | 7 ++++++-
 src/android/post_processor.h             | 8 ++++++++
 src/android/yuv/post_processor_yuv.cpp   | 4 ++++
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/android/jpeg/post_processor_jpeg.cpp b/src/android/jpeg/post_processor_jpeg.cpp
index fe41207a..69f3c5dd 100644
--- a/src/android/jpeg/post_processor_jpeg.cpp
+++ b/src/android/jpeg/post_processor_jpeg.cpp
@@ -87,8 +87,10 @@ int PostProcessorJpeg::process(const FrameBuffer *source,
 			       const CameraMetadata &requestMetadata,
 			       CameraMetadata *resultMetadata)
 {
-	if (!encoder_)
+	if (!encoder_) {
+		processComplete.emit(PostProcessor::Status::Failed);
 		return 0;
+	}
 
 	ASSERT(destination->numPlanes() == 1);
 
@@ -181,6 +183,7 @@ int PostProcessorJpeg::process(const FrameBuffer *source,
 					 exif.data(), quality);
 	if (jpeg_size < 0) {
 		LOG(JPEG, Error) << "Failed to encode stream image";
+		processComplete.emit(PostProcessor::Status::Failed);
 		return jpeg_size;
 	}
 
@@ -195,5 +198,7 @@ int PostProcessorJpeg::process(const FrameBuffer *source,
 	/* Update the JPEG result Metadata. */
 	resultMetadata->addEntry(ANDROID_JPEG_SIZE, jpeg_size);
 
+	processComplete.emit(PostProcessor::Status::Success);
+
 	return 0;
 }
diff --git a/src/android/post_processor.h b/src/android/post_processor.h
index 61dfb6d4..edf1a4bf 100644
--- a/src/android/post_processor.h
+++ b/src/android/post_processor.h
@@ -7,6 +7,8 @@
 #ifndef __ANDROID_POST_PROCESSOR_H__
 #define __ANDROID_POST_PROCESSOR_H__
 
+#include <libcamera/base/signal.h>
+
 #include <libcamera/framebuffer.h>
 #include <libcamera/stream.h>
 
@@ -25,6 +27,12 @@ public:
 			    CameraBuffer *destination,
 			    const CameraMetadata &requestMetadata,
 			    CameraMetadata *resultMetadata) = 0;
+
+	enum Status {
+		Success,
+		Failed,
+	};
+	libcamera::Signal<Status> processComplete;
 };
 
 #endif /* __ANDROID_POST_PROCESSOR_H__ */
diff --git a/src/android/yuv/post_processor_yuv.cpp b/src/android/yuv/post_processor_yuv.cpp
index 0a874886..d1db9216 100644
--- a/src/android/yuv/post_processor_yuv.cpp
+++ b/src/android/yuv/post_processor_yuv.cpp
@@ -60,6 +60,7 @@ int PostProcessorYuv::process(const FrameBuffer *source,
 	const MappedFrameBuffer sourceMapped(source, MappedFrameBuffer::MapFlag::Read);
 	if (!sourceMapped.isValid()) {
 		LOG(YUV, Error) << "Failed to mmap camera frame buffer";
+		processComplete.emit(PostProcessor::Status::Failed);
 		return -EINVAL;
 	}
 
@@ -77,9 +78,12 @@ int PostProcessorYuv::process(const FrameBuffer *source,
 				    libyuv::FilterMode::kFilterBilinear);
 	if (ret) {
 		LOG(YUV, Error) << "Failed NV12 scaling: " << ret;
+		processComplete.emit(PostProcessor::Status::Failed);
 		return -EINVAL;
 	}
 
+	processComplete.emit(PostProcessor::Status::Success);
+
 	return 0;
 }
 
-- 
2.31.0