• Andreas Rheinhardt's avatar
    avformat/matroskadec: Fix lzo decompression · 2ff687c1
    Andreas Rheinhardt authored
    When a Matroska Block is only stored in compressed form, the size of
    the uncompressed block is not explicitly coded and therefore not known
    before decompressing it. Therefore the demuxer uses a guess for the
    uncompressed size: The first guess is three times the compressed size
    and if this is not enough, it is repeatedly incremented by a factor of
    three. But when this happens with lzo, the decompression is neither
    resumed nor started again. Instead when av_lzo1x_decode indicates that x
    bytes of input data could not be decoded, because the output buffer is
    already full, the first (not the last) x bytes of the input buffer are
    resent for decoding in the next try; they overwrite already decoded
    data.
    
    This commit fixes this by instead restarting the decompression anew,
    just with a bigger buffer.
    
    This seems to be a regression since 935ec5a1.
    
    A FATE-test for this has been added.
    Signed-off-by: 's avatarAndreas Rheinhardt <andreas.rheinhardt@gmail.com>
    Signed-off-by: 's avatarJames Almer <jamrial@gmail.com>
    2ff687c1
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