On Fri, 2022-08-05 at 20:27 -0700, Philip Langdale wrote:
> vaapi_decode_find_best_format currently does not set the
> VA_SURFACE_ATTRIB_SETTABLE flag on the pixel format attribute that it
> returns.
>
> Without this flag, the attribute will be ignored by vaCreateSurfaces,
> meaning that the driver's default logic for picking a pixel format will
> kick in.
>
> So far, this hasn't produced visible problems, but when trying to
> decode 4:4:4 content, at least on Intel, the driver will pick the
> 444P planar format, even though the decoder can only return the AYUV
> packed format.
>
> The hwcontext_vaapi code that sets surface attributes when picking
> formats does not have this bug.
>
> Applications may use their own logic for finding the best format, and
> so may not hit this bug. eg: mpv is unaffected.
>
> Signed-off-by: Philip Langdale <phil...@overt.org>
> ---
> libavcodec/vaapi_decode.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/libavcodec/vaapi_decode.c b/libavcodec/vaapi_decode.c
> index db48efc3ed..bc2d3ed803 100644
> --- a/libavcodec/vaapi_decode.c
> +++ b/libavcodec/vaapi_decode.c
> @@ -358,6 +358,8 @@ static int vaapi_decode_find_best_format(AVCodecContext
> *avctx,
>
> ctx->pixel_format_attribute = (VASurfaceAttrib) {
> .type = VASurfaceAttribPixelFormat,
> + .flags = VA_SURFACE_ATTRIB_SETTABLE,
> + .value.type = VAGenericValueTypeInteger,
> .value.value.i = best_fourcc,
> };
LGTM, thx
-Haihao
>
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