[FFmpeg-devel] [PATCH v2 0/2] Add common V4L2 request API code

[Elie Roudninski]

Please disregard this patch series.
Since I sent those yesterday I have been contacted by the original
authors and was told that those are outdated.
Both LibreELEC and RPi devs are working on a different version of the
code that would need to be consolidated first before it can go
upstream.

Sorry for the noise.

Best regards,

Le mar. 12 avr. 2022 à 17:53, <xademax at gmail.com> a écrit :
>
> From: Elie ROUDNINSKI <xademax at gmail.com>
>
> This is the second iteration of https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=2898
> but only covering the common V4L2 request API code without the support for h264 codec.
>
> Changes in v2:
> * Addressed some styling comments
> * Removed libudev dependency
> * Device probing has been refactored
>
> This code (in one version or another) has been widely used by various projects
> like LibreELEC[1] for several years already.
> The uAPI has been stable for several kernel versions too and as of linux5.17,
> the following codecs are available:
> * mpeg2
> * h264
> * vp9
>
> HEVC is in the process of being stabilized too[2].
>
> I have tried to contact the original author of the code but I haven't got an answer
> so far so I have kept them as commit author but added myself as co-author since
> I have made substantial modifications to it. Happy to change this either way.
>
> It's my first contribution to FFmpeg, so I hope to have done everything right.
> Additionally, I must confess that I am not an expert of the V4L2 request APIs but
> since I was frustrated of not being able to use standard FFmpeg on my ARM boards
> to get hardware decoding working, I figured I might just try to give it a go.
> There are several comments in the original patch series that I won't have an answer
> for but I hope that won't be a blocker. That's also why the v4l2-request configure
> option has been marked as experimental.
>
> [1] https://github.com/LibreELEC/LibreELEC.tv/tree/master/packages/multimedia/ffmpeg/patches/v4l2-request
> [2] https://patchwork.kernel.org/project/linux-media/list/?series=630077
>
>
> Jonas Karlman (2):
>   avutil/buffer: add av_buffer_pool_flush()
>   avcodec: add common V4L2 request API code
>
>  configure                 |   7 +
>  doc/APIchanges            |   3 +
>  libavcodec/Makefile       |   3 +-
>  libavcodec/hwconfig.h     |   2 +
>  libavcodec/v4l2_buffers.c |   8 +-
>  libavcodec/v4l2_context.c |  80 ++--
>  libavcodec/v4l2_context.h |   5 +-
>  libavcodec/v4l2_device.c  | 229 ++++++++++
>  libavcodec/v4l2_device.h  |  60 +++
>  libavcodec/v4l2_m2m.c     | 119 ++---
>  libavcodec/v4l2_m2m.h     |   4 +-
>  libavcodec/v4l2_m2m_dec.c |  10 +-
>  libavcodec/v4l2_m2m_enc.c |   8 +-
>  libavcodec/v4l2_request.c | 892 ++++++++++++++++++++++++++++++++++++++
>  libavcodec/v4l2_request.h |  87 ++++
>  libavutil/buffer.c        |   7 +
>  libavutil/buffer.h        |   5 +
>  libavutil/version.h       |   4 +-
>  18 files changed, 1399 insertions(+), 134 deletions(-)
>  create mode 100644 libavcodec/v4l2_device.c
>  create mode 100644 libavcodec/v4l2_device.h
>  create mode 100644 libavcodec/v4l2_request.c
>  create mode 100644 libavcodec/v4l2_request.h
>
> --
> 2.35.1
>