[libcamera-devel] [PATCH v8 6/7] android: post_processor: Drop return value for process()

[Hirokazu Honda]

Hi Umang,

On Tue, Oct 26, 2021 at 4:22 PM Umang Jain <umang.jain at ideasonboard.com> wrote:
>
> 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 at ideasonboard.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Reviewed-by: Hirokazu Honda <hiroh at chromium.org>
> ---
>  src/android/camera_stream.cpp            |  4 +++-
>  src/android/jpeg/post_processor_jpeg.cpp |  6 ++----
>  src/android/jpeg/post_processor_jpeg.h   |  2 +-
>  src/android/post_processor.h             |  2 +-
>  src/android/yuv/post_processor_yuv.cpp   | 10 ++++------
>  src/android/yuv/post_processor_yuv.h     |  2 +-
>  6 files changed, 12 insertions(+), 14 deletions(-)
>
> diff --git a/src/android/camera_stream.cpp b/src/android/camera_stream.cpp
> index dac216d6..fed99022 100644
> --- a/src/android/camera_stream.cpp
> +++ b/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()
> diff --git a/src/android/jpeg/post_processor_jpeg.cpp b/src/android/jpeg/post_processor_jpeg.cpp
> index 5e8c61fc..d72ebc3c 100644
> --- a/src/android/jpeg/post_processor_jpeg.cpp
> +++ b/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;
>  }
> diff --git a/src/android/jpeg/post_processor_jpeg.h b/src/android/jpeg/post_processor_jpeg.h
> index 92385548..43fcbe60 100644
> --- a/src/android/jpeg/post_processor_jpeg.h
> +++ b/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,
> diff --git a/src/android/post_processor.h b/src/android/post_processor.h
> index 4ac74fcf..5ec71c93 100644
> --- a/src/android/post_processor.h
> +++ b/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;
>  };
> diff --git a/src/android/yuv/post_processor_yuv.cpp b/src/android/yuv/post_processor_yuv.cpp
> index 05c4f1cf..9f883924 100644
> --- a/src/android/yuv/post_processor_yuv.cpp
> +++ b/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,
> diff --git a/src/android/yuv/post_processor_yuv.h b/src/android/yuv/post_processor_yuv.h
> index 5954e11b..39ec7994 100644
> --- a/src/android/yuv/post_processor_yuv.h
> +++ b/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,
> --
> 2.31.1
>