Feature request: H265 decoding

[hfrappier]

Chromium can be compiled to support HEVC demuxing in an MP4 container, and decoding via v4l2:

eg: on 73.0.3683.103:

#args.gn
enable_hevc_demuxing=true

// v4l2_video_decode_accelerator.cc (73.0.3683.103)
@@ -88,6 +88,9 @@ const uint32_t V4L2VideoDecodeAccelerator::supported_input_fourccs_[] = {
 #if !BUILDFLAG(USE_LINUX_V4L2)
     V4L2_PIX_FMT_VP9,
 #endif
+#if BUILDFLAG(ENABLE_HEVC_DEMUXING) && defined(V4L2_PIX_FMT_HEVC)
+    V4L2_PIX_FMT_HEVC,
+#endif
 };

[JeffyCN]

right, it's possible to enable hevc demuxer and add hevc format in v4l2 vda, but i haven't test that.(hevc support is mostly enabled in platform vda, e.g. android/vaapi)

adding hevc in this plugin is quite simple, just add the format here: https://github.com/JeffyCN/libv4l-rkmpp/blob/master/src/libv4l-rkmpp-dec.c#L31

if you can help to test it, i think it's ok to add that.

[hfrappier]

Which value would be required for the V4L2_PIX_FMT_HEVC case at: https://github.com/JeffyCN/libv4l-rkmpp/blob/master/src/libv4l-rkmpp-dec.c#L622

[JeffyCN]

same as h264 i guess, i was using it in other wrappers for a while, e.g. ffmpeg, gst-mpp

[JeffyCN]

FYI, since chrome has hevc hw decoder support in R104, i've added and tested it with meta-rockchip.

[hfrappier]

Awesome! Will this be tagged as 1.4.1?

[JeffyCN]

Awesome! Will this be tagged as 1.4.1?

i'm planing to increase the size limits(for newer chips), and switch to meson build system before new tag in next week.

[hfrappier]

Will this be configurable externally (for older chips)

[JeffyCN]

guessing it would failed (>4k on old chips) and fallback to sw decoder, which might not be usable anyway.

buy it's ok to make it configurable, i'll try to do so

[JeffyCN]

uploaded 1.5.0