reason:
some h264 streams have some strange pictures, from
vaapi input these pictures don't have a reference frame,
however, they are not intra only pictures, in MB layer
these pictures are looking for some references, if they
cannot find it. It could cause PF.
when reference pictures exist, it will need to set used_for
reference_flags, therefore if that is set, however the
number of reference frames is zero, which is odd, it
should be avoided.
solution:
In the above case, to scan the ref list so that it will
make at least one reference available to avoid crash, since
this is not accurate enough, it could cause some artifacts.
And in that case, it will need to be checked individually
for another solution.
closes: https://gitlab.freedesktop.org/drm/amd/-/issues/1462
closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/8401
Cc: mesa-stable
Tested-by: llyyr <llyyr.public@gmail.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
Signed-off-by: Ruijing Dong <ruijing.dong@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21732>
Ruijing Dong
0f3370eede