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avcodec/h264_cavlc: Set valid qscale value in ff_h264_decode_mb_cavlc()

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When ff_h264_decode_mb_cavlc() failed due to wrong sl->qscale values,
e.g. dquant out of range, set the qscale to be a valid value before
returning -1 and exiting the function. The qscale value can be used
later e.g. in loop filter.

BUG=806122

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 71f39de2a5)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Xiaohan Wang 2018-02-03 01:43:35 -08:00 committed by Michael Niedermayer
parent 76a886dae3
commit e8fb74c0c9
1 changed files with 1 additions and 0 deletions
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libavcodec/h264_cavlc.c
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@ -1111,6 +1111,7 @@ decode_intra_mb:
else sl->qscale -= max_qp+1;
if (((unsigned)sl->qscale) > max_qp){
av_log(h->avctx, AV_LOG_ERROR, "dquant out of range (%d) at %d %d\n", dquant, sl->mb_x, sl->mb_y);
sl->qscale = max_qp;
return -1;
}
}