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Sur d’autres sites (4510)

  • avcodec/pnm : explicitly tag color range

    25 octobre 2023, par Niklas Haas
    avcodec/pnm : explicitly tag color range

    PGMYUV seems to be always limited range. This was a format originally
    
invented by FFmpeg at a time when YUVJ distinguished limited from full
    
range YUV, and this codec never appeared to output YUVJ in any
    
circumstance, so hard-coding limited range preserves the status quo.
    

    The other formats are explicitly documented to be full range RGB/gray
    
formats. That said, don't tag them yet, due to outstanding bugs w.r.t
    
grayscale formats and color range handling.
    

    This change in behavior updates a bunch of FATE tests in trivial ways
    
(added tagging being the only difference).
    • [DH] libavcodec/pnm.c
    • [DH] tests/ref/lavf/mkv
    • [DH] tests/ref/lavf/mkv_attachment
    • [DH] tests/ref/lavf/mxf
    • [DH] tests/ref/lavf/y4m
    • [DH] tests/ref/seek/lavf-mkv
    • [DH] tests/ref/seek/lavf-y4m

  • avcodec/dstdec : Check that AC probabilities are within range

    15 octobre 2019, par Michael Niedermayer
    avcodec/dstdec : Check that AC probabilities are within range

    ISO/IEC 14496-3:2005(E) : "Each entry of P_one[ ][ ] is in the range of 1 to
    
128, corresponding to a probability of 1/256 to 128/256 of the next error bit (bit E, See Figure 10.5)..."
    

    Fixes : Timeout (42sec ->1sec)
    
Fixes : 18181/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DST_fuzzer-5736646250594304
    

    Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/dstdec.c

  • avcodec/anm : Check extradata length before allocating frame

    30 mai 2020, par Andreas Rheinhardt
    avcodec/anm : Check extradata length before allocating frame

    Then one doesn't need to free the frame in case the length turns out to
    
be insufficient.
    

    Reviewed-by : Peter Ross <pross@xvid.org>
    
Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
    • [DH] libavcodec/anm.c

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