23.11.2020 06:07, Ezequiel Garcia пишет: > On Sat, 21 Nov 2020 at 23:01, Dmitry Osipenko <digetx@xxxxxxxxx> wrote: >> >> 22.11.2020 04:02, Ezequiel Garcia пишет: >>> Hi Dmitry, >>> >> ... >>>> +++ b/drivers/staging/media/tegra-vde/TODO >>>> @@ -0,0 +1,4 @@ >>>> +TODO: >>>> + - Implement V4L2 API once it gains support for stateless decoders. >>>> + >>>> +Contact: Dmitry Osipenko <digetx@xxxxxxxxx> >>> >>> The API for H264 stateless decoding is ready. >>> See https://lkml.org/lkml/2020/11/18/795. >> >> Hello Ezequiel, >> >> Thank you for the notification! My last attempt at implementing V4L API >> support was about a year ago and it stopped once I realized that there >> is no userspace which uses that API. FFMPEG and chromium browser had >> some kind of V4L support, but it all was oriented at downstream driver >> stacks, and thus, not usable. Do you know what is the current status? >> > > The bulk of the API, which relies on the stateless decoder interface [1], > and H264 stateless V4L2 controls has been ready for some time now, > and there are various implementations supporting it. > > Chromium supports it [2], and I've tested it on chromebooks, > through chromeos builds. We haven't tried a non-chromeos build, > and I would say it's quite some work. > > GStreamer support is available as well. See [3] which should > work for the latest H264 controls (the ones being moved out of staging). > > LibreELEC developers maintain an Ffmpeg branch [4], I expect it will > be updated for the latest H264 controls soon, and hopefully merged > in mainline Ffmpeg. > > GStreamer and Ffmpeg are relatively straightforward to build and test. > > Thanks, > Ezequiel > > [1] https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/dev-stateless-decoder.html > [2] https://github.com/chromium/chromium/tree/master/media/gpu/v4l2 > [3] https://gitlab.freedesktop.org/ezequielgarcia/gst-plugins-bad/-/tree/h264_stable_uapi > [4] https://github.com/Kwiboo/FFmpeg/tree/v4l2-request-hwaccel-4.3. Alright, thank you.
