lavu/hwcontext_vaapi: fix a race mapping to allow CSC to YUV420P

There's a race condition for YUV420P when mapping from pix_fmt
to VA fourcc, both I420 and YV12 could be found by pix_fmt.

Currently, vaapi_get_image_format() iterates over the query results
of pix_fmt and returns the first matching result in the order
declared in the driver. This may result in an incorrect image_format.

Now use fourcc to find the image_format.

Fixes:
ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -i INPUT \
-vf scale_vaapi=format=yuv420p,hwmap,format=yuv420p \
-vframes 1 -f rawvideo -y yuv420p.yuv

Signed-off-by: nyanmisaka <nst799610810@gmail.com>

0 files changed, 0 insertions, 0 deletions