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avcodec/vc1dec: Disable error concealment for *IMAGE

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The existing error concealment makes no sense for the image formats, they
use transformed source images which is different from keyframe + MC+difference
for which the error concealment is designed.
Of course feel free to re-enable this if you have a case where it works and
improves vissual results

Fixes: Timeout
Fixes: 36234/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1IMAGE_fuzzer-6300306743885824

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 643b2d49bf)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-07-31 00:01:53 +02:00
parent 966ade1dab
commit 36a6e6980e
1 changed files with 3 additions and 1 deletions
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4
libavcodec/vc1dec.c
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@ -1073,7 +1073,9 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
ret = AVERROR_INVALIDDATA;
goto err;
}
if (!v->field_mode)
if ( !v->field_mode
&& avctx->codec_id != AV_CODEC_ID_WMV3IMAGE
&& avctx->codec_id != AV_CODEC_ID_VC1IMAGE)
ff_er_frame_end(&s->er);
}