[FFmpeg-devel] PATCH: Force vaapi image formats to NV12-only

[Zhao Zhili]

> vaapi drivers often lack proper image converesions and not all
> situations allow vagetimage or vaputimage with the image formats
> reported by the api. nv12 seems allowed in all circumstances.
> 
> with this change now one can use the hwaccel directly without
> explicit conversions to nv12 for frame downloading to work.
> 
> gstreamer adopted a similar approach:
> https://bugzilla.gnome.org/show_bug.cgi?id=752958
> ---
>  libavutil/hwcontext_vaapi.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/libavutil/hwcontext_vaapi.c b/libavutil/hwcontext_vaapi.c
> index 12bc95119a..d678e58d07 100644
> --- a/libavutil/hwcontext_vaapi.c
> +++ b/libavutil/hwcontext_vaapi.c
> @@ -418,7 +418,12 @@ static int vaapi_device_init(avhwdevicecontext *hwdev)
>      for (i = 0; i < image_count; i++) {
>          fourcc  = image_list[i].fourcc;
>          pix_fmt = vaapi_pix_fmt_from_fourcc(fourcc);
> -        if (pix_fmt == av_pix_fmt_none) {
> +        if (pix_fmt != av_pix_fmt_nv12) {
> +            av_log(hwdev, av_log_debug, "format %#x -> ignored.\n",
> +                   fourcc);
> +            continue;
> +        }
> +        else if (pix_fmt == av_pix_fmt_none) {
>              av_log(hwdev, av_log_debug, "format %#x -> unknown.\n",
>                     fourcc);
>          } else {
> -- 
> 2.44.1

Isn’t it break all pixel formats with bit depth > 8?
I think we already have hwcontext API to select sw_format, this isn’t a bug
inside ffmpeg.

> On Aug 9, 2024, at 02:37, Lluís Batlle i Rossell <viric at viric.name> wrote:
> 
> attached
> <0001-Force-vaapi-image-formats-to-NV12-only.patch>_______________________________________________
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