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avcodec/qpeg: Optimize full width runs in qpeg_decode_intra() 

This improves the speed of decoding large patches of constant color

Fixes: Timeout
Fixes: 10967/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QPEG_fuzzer-5630803793936384

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-11-05 22:46:43 +01:00
parent ff3b4f91cd
commit 07bc603757
1 changed files with 6 additions and 0 deletions
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6
libavcodec/qpeg.c
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@ -85,6 +85,12 @@ static void qpeg_decode_intra(QpegContext *qctx, uint8_t *dst,
filled = 0;
dst -= stride;
rows_to_go--;
while (run - i > width && rows_to_go > 0) {
memset(dst, p, width);
dst -= stride;
rows_to_go--;
i += width;
}
if(rows_to_go <= 0)
break;
}