diff options
| -rw-r--r-- | libmpcodecs/ad_imaadpcm.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/libmpcodecs/ad_imaadpcm.c b/libmpcodecs/ad_imaadpcm.c index f1e03b59a7..7a8e89dc41 100644 --- a/libmpcodecs/ad_imaadpcm.c +++ b/libmpcodecs/ad_imaadpcm.c @@ -150,16 +150,10 @@ static void decode_nibbles(unsigned short *output, sign = delta & 8; delta = delta & 7; + delta = 2 * delta + 1; + if (sign) delta = -delta; - diff = step[channel_number] >> 3; - if (delta & 4) diff += step[channel_number]; - if (delta & 2) diff += step[channel_number] >> 1; - if (delta & 1) diff += step[channel_number] >> 2; - - if (sign) - predictor[channel_number] -= diff; - else - predictor[channel_number] += diff; + predictor[channel_number] += (delta * step[channel_number]) >> 3; CLAMP_S16(predictor[channel_number]); output[i] = predictor[channel_number]; |