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Code Issues Releases Activity

avcodec/av1_vaapi: fixed a decoding corruption issue

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In av1_spec.pdf page 38/669, there is a sentence below:

if ( frame_type == KEY_FRAME && show_frame ) {
   for ( i = 0; i < NUM_REF_FRAMES; i++) {
      RefValid[ i ] = 0
      ......
   }
   ......
}

This shows that the condition of invalidating current
DPB frames should be the coming frame_type is KEY_FRAME plus
show_frame is equal to 1. Otherwise, some of the frames
in sequence after KEY_FRAME still refer to the reference frames
before KEY_FRAME, and if these before KEY_FRAME reference
frames were invalidated, these frames could not find their
reference frames, and it could cause image corruption.

Mesa fix is in https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19386

Reviewed-by: Fei Wang <fei.w.wang@intel.com>
Signed-off-by: Ruijing Dong <ruijing.dong@amd.com>
This commit is contained in:
Ruijing Dong 2022-11-02 15:35:53 -04:00 committed by Haihao Xiang
parent 3819719099
commit 89e3814569
1 changed files with 1 additions and 1 deletions
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2
libavcodec/vaapi_av1.c
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@ -274,7 +274,7 @@ static int vaapi_av1_start_frame(AVCodecContext *avctx,
};
for (int i = 0; i < AV1_NUM_REF_FRAMES; i++) {
if (pic_param.pic_info_fields.bits.frame_type == AV1_FRAME_KEY)
if (pic_param.pic_info_fields.bits.frame_type == AV1_FRAME_KEY && frame_header->show_frame)
pic_param.ref_frame_map[i] = VA_INVALID_ID;
else
pic_param.ref_frame_map[i] = ctx->ref_tab[i].valid ?