[FFmpeg-devel] [PATCH] avcodec/qpeg: Optimize full width runs in qpeg_decode_intra()
Michael Niedermayer
michael at niedermayer.cc
Tue Nov 6 00:17:47 EET 2018
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 at niedermayer.cc>
---
libavcodec/qpeg.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libavcodec/qpeg.c b/libavcodec/qpeg.c
index e1210c1972..cb452621e7 100644
--- a/libavcodec/qpeg.c
+++ b/libavcodec/qpeg.c
@@ -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;
}
--
2.19.1
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