[libcamera-devel] [PATCH v2 0/9] Async Post Processor

[Umang Jain]

This series aims to enable async post-processing of streams
in the HAL layer.

Patch [1-5]/9 introduces basic plumbing preparation to run
post-processing async. The idea here is to send enough information
for the post-processor and retrieve it back(via signal mechanism)
to complete capture results and sending it back to framework.

Patch 6/9 adds a queue.
When a request requires post-processing it is first added to a queue.
Before queueing, a lot of context information is saved in form of
Camera3RequestDescriptor struct. The struct is then pushed to the queue.
When the post-processing is completed,
CameraDevice::streamProcessingComplete() is called and the status of
corresponding Camera3RequestDescriptor is updated(failed/succeeded).

After that sendQueuedCaptureResults() inspects the queue to check if
any capture results are ready to be sent to the framework. If yes, it
shall send it and de-queue it from the queue.

Patch 7/9 is a simple move of buffer mapping from CameraStream to
CameraDevice.

Patch 8/9 adds a worker class and a thread. The worker will be used to
PostProcessor::process() in that thread.

Patch 9/9 is a really a RFC which temporarily address one of \todo
in 8/9.

--
Changes in v2:
 - Move Camera3RequestDescriptor struct out of CameraDevice private(2/9)
 - Pass Camera3RequestDescriptor pointer as a context to PostProcessor
   class and emit it back via processComplete signal.
 - RFC patch (needs some discussion)
---

Umang Jain (9):
  android: camera_stream: Pass FrameBuffer pointer instead of reference
  camera_device: Remove private scope of Camera3RequestDescriptor
  android: post_processor: Plumb down the process() with context
  android: post_processor: Notify post processing completion status
  android: camera_stream: Query post-processing status
  android: camera_device: Add a queue for sending capture results
  android: camera_device: Move buffer mapping for post processing
  android: camera_stream: Run post-processor in a separate thread
  RFC: Stop PostProcessor when camera is stopped

 src/android/camera_device.cpp            | 146 +++++++++++++++++++++--
 src/android/camera_device.h              |  56 ++++++---
 src/android/camera_stream.cpp            |  47 +++++---
 src/android/camera_stream.h              |  57 ++++++++-
 src/android/jpeg/encoder.h               |   2 +-
 src/android/jpeg/encoder_libjpeg.cpp     |   4 +-
 src/android/jpeg/encoder_libjpeg.h       |   2 +-
 src/android/jpeg/post_processor_jpeg.cpp |  14 ++-
 src/android/jpeg/post_processor_jpeg.h   |   7 +-
 src/android/jpeg/thumbnailer.cpp         |   4 +-
 src/android/jpeg/thumbnailer.h           |   2 +-
 src/android/post_processor.h             |  15 ++-
 src/android/yuv/post_processor_yuv.cpp   |  25 ++--
 src/android/yuv/post_processor_yuv.h     |   7 +-
 14 files changed, 314 insertions(+), 74 deletions(-)

-- 
2.31.1