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Originally committed as revision 12969 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2008-04-25 15:15:56 +00:00
parent e67fe90c40
commit 3b4eccabae
1 changed files with 24 additions and 24 deletions
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48
libavcodec/adpcm.c
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@ -922,38 +922,38 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
case CODEC_ID_ADPCM_IMA_QT: case CODEC_ID_ADPCM_IMA_QT:
n = buf_size - 2*avctx->channels; n = buf_size - 2*avctx->channels;
for (channel = 0; channel < avctx->channels; channel++) { for (channel = 0; channel < avctx->channels; channel++) {
cs = &(c->status[channel]); cs = &(c->status[channel]);
/* (pppppp) (piiiiiii) */ /* (pppppp) (piiiiiii) */
/* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */ /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
cs->predictor = (*src++) << 8; cs->predictor = (*src++) << 8;
cs->predictor |= (*src & 0x80); cs->predictor |= (*src & 0x80);
cs->predictor &= 0xFF80; cs->predictor &= 0xFF80;
/* sign extension */ /* sign extension */
if(cs->predictor & 0x8000) if(cs->predictor & 0x8000)
cs->predictor -= 0x10000; cs->predictor -= 0x10000;
cs->predictor = av_clip_int16(cs->predictor); cs->predictor = av_clip_int16(cs->predictor);
cs->step_index = (*src++) & 0x7F; cs->step_index = (*src++) & 0x7F;
if (cs->step_index > 88){ if (cs->step_index > 88){
av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index); av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
cs->step_index = 88; cs->step_index = 88;
} }
cs->step = step_table[cs->step_index]; cs->step = step_table[cs->step_index];
samples = (short*)data + channel; samples = (short*)data + channel;
for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */ for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */
*samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F, 3); *samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F, 3);
samples += avctx->channels; samples += avctx->channels;
*samples = adpcm_ima_expand_nibble(cs, src[0] >> 4 , 3); *samples = adpcm_ima_expand_nibble(cs, src[0] >> 4 , 3);
samples += avctx->channels; samples += avctx->channels;
src ++; src ++;
} }
} }
if (st) if (st)
samples--; samples--;