[FFmpeg-devel] [PATCH] avcodec/pngdec: Optimize has_trns code

[Michael Niedermayer]

On Sun, Aug 18, 2019 at 10:29:02AM +0200, Michael Niedermayer wrote:
> add inner loop specialisations for 2 bpp and 4 bpp
> These are all cases for which i found testsamples.
> 
> 30M cycles -> 5M cycles
> 
> Testcase: fate-rgbapng-4816
> Testcase: 16097/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APNG_fuzzer-5664690889293824
> 
> 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/pngdec.c | 37 +++++++++++++++++++++++++++++--------
>  1 file changed, 29 insertions(+), 8 deletions(-)

will apply

[...]
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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

If you drop bombs on a foreign country and kill a hundred thousand
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"unprovoked inhuman terrorist attacks" and use it to justify dropping
more bombs and killing more people. The technology changed, the idea is old.
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