• Martin Storsjö's avatar
    adpcm: Write the proper predictor in trellis mode in IMA QT · 0776e0ef
    Martin Storsjö authored
    The actual predictor value, set by the trellis code, never
    was written back into the variable that was written into
    the block header. This was accidentally removed in b304244b.
    
    This significantly improves the audio quality of the trellis
    case, which was plain broken since b304244b.
    
    Encoding IMA QT with trellis still actually gives a slightly
    worse quality than without trellis, since the trellis encoder
    doesn't use the exact same way of rounding as in
    adpcm_ima_qt_compress_sample and adpcm_ima_qt_expand_nibble.
    
    CC: libav-stable@libav.org
    Signed-off-by: 's avatarMartin Storsjö <martin@martin.st>
    0776e0ef
adpcmenc.c 26.8 KB