ffmpeg | branch: master | Michael Niedermayer <mich...@niedermayer.cc> | Thu May 23 01:06:58 2019 +0200| [e6f4d5dc384af334a5c7b61969db9d7d9c1b7e0a] | committer: Michael Niedermayer
avcodec/ffv1dec_template: Optimize common case in run mode Fixes: Timeout (14sec -> 9sec) Fixes: 13398/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FFV1_fuzzer-5664106709778432 decode_line() becomes 1% faster for fate/vsynth2-ffv1.avi for another fate sample there is a 0.5% speedup the effect should be bigger for files with "flat" colored areas the new faster branch is used in 97-100% of the cases in fate samples compared to the older more complex (which i tested) vsynth3-ffv1-v3-bgr0.avi had the lowest percentual useage of about 97% Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e6f4d5dc384af334a5c7b61969db9d7d9c1b7e0a --- libavcodec/ffv1dec_template.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/libavcodec/ffv1dec_template.c b/libavcodec/ffv1dec_template.c index 1b7f6c4bf5..0b1d176ba1 100644 --- a/libavcodec/ffv1dec_template.c +++ b/libavcodec/ffv1dec_template.c @@ -86,11 +86,19 @@ static av_always_inline int RENAME(decode_line)(FFV1Context *s, int w, run_mode = 2; } } + if (sample[1][x - 1] == sample[0][x - 1]) { + while (run_count > 1 && w-x > 1) { + sample[1][x] = sample[0][x]; + x++; + run_count--; + } + } else { while (run_count > 1 && w-x > 1) { sample[1][x] = RENAME(predict)(sample[1] + x, sample[0] + x); x++; run_count--; } + } run_count--; if (run_count < 0) { run_mode = 0; _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email ffmpeg-cvslog-requ...@ffmpeg.org with subject "unsubscribe".
