* Features and limitations:
*
* Reference documents:
- * http://www.pcisys.net/~melanson/codecs/simpleaudio.html
- * http://www.geocities.com/SiliconValley/8682/aud3.txt
- * http://openquicktime.sourceforge.net/plugins.htm
- * XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html
- * http://www.cs.ucla.edu/~leec/mediabench/applications.html
- * SoX source code http://home.sprynet.com/~cbagwell/sox.html
+ * http://wiki.multimedia.cx/index.php?title=Category:ADPCM_Audio_Codecs
+ * http://www.pcisys.net/~melanson/codecs/simpleaudio.html [dead]
+ * http://www.geocities.com/SiliconValley/8682/aud3.txt [dead]
+ * http://openquicktime.sourceforge.net/
+ * XAnim sources (xa_codec.c) http://xanim.polter.net/
+ * http://www.cs.ucla.edu/~leec/mediabench/applications.html [dead]
+ * SoX source code http://sox.sourceforge.net/
*
* CD-ROM XA:
- * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html
- * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html
+ * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html [dead]
+ * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html [dead]
* readstr http://www.geocities.co.jp/Playtown/2004/
*/
ADPCMDecodeContext *c = avctx->priv_data;
ADPCMChannelStatus *cs;
int n, m, channel, i;
- int block_predictor[2];
short *samples;
short *samples_end;
const uint8_t *src;
switch(avctx->codec->id) {
case CODEC_ID_ADPCM_IMA_QT:
- n = buf_size - 2*avctx->channels;
+ /* In QuickTime, IMA is encoded by chunks of 34 bytes (=64 samples).
+ Channel data is interleaved per-chunk. */
+ if (buf_size / 34 < avctx->channels) {
+ av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
+ return AVERROR(EINVAL);
+ }
for (channel = 0; channel < avctx->channels; channel++) {
int16_t predictor;
int step_index;
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 = 0; m < 32; m++) {
*samples = adpcm_ima_qt_expand_nibble(cs, src[0] & 0x0F, 3);
samples += avctx->channels;
*samples = adpcm_ima_qt_expand_nibble(cs, src[0] >> 4 , 3);
}
while(src < buf + buf_size){
- for(m=0; m<4; m++){
- for(i=0; i<=st; i++)
- *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] & 0x0F, 3);
- for(i=0; i<=st; i++)
- *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] >> 4 , 3);
- src++;
+ for (i = 0; i < avctx->channels; i++) {
+ cs = &c->status[i];
+ for (m = 0; m < 4; m++) {
+ uint8_t v = *src++;
+ *samples = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);
+ samples += avctx->channels;
+ *samples = adpcm_ima_expand_nibble(cs, v >> 4 , 3);
+ samples += avctx->channels;
+ }
+ samples -= 8 * avctx->channels - 1;
}
- src += 4*st;
+ samples += 7 * avctx->channels;
}
break;
case CODEC_ID_ADPCM_4XM:
- cs = &(c->status[0]);
- c->status[0].predictor= (int16_t)bytestream_get_le16(&src);
- if(st){
- c->status[1].predictor= (int16_t)bytestream_get_le16(&src);
- }
- c->status[0].step_index= (int16_t)bytestream_get_le16(&src);
- if(st){
- c->status[1].step_index= (int16_t)bytestream_get_le16(&src);
- }
- if (cs->step_index < 0) cs->step_index = 0;
- if (cs->step_index > 88) cs->step_index = 88;
+ for (i = 0; i < avctx->channels; i++)
+ c->status[i].predictor= (int16_t)bytestream_get_le16(&src);
- m= (buf_size - (src - buf))>>st;
- for(i=0; i<m; i++) {
- *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] & 0x0F, 4);
- if (st)
- *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] & 0x0F, 4);
- *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] >> 4, 4);
- if (st)
- *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] >> 4, 4);
+ for (i = 0; i < avctx->channels; i++) {
+ c->status[i].step_index= (int16_t)bytestream_get_le16(&src);
+ c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
}
- src += m<<st;
+ m= (buf_size - (src - buf))>>st;
+ for (i = 0; i < avctx->channels; i++) {
+ samples = (short*)data + i;
+ cs = &c->status[i];
+ for (n = 0; n < m; n++) {
+ uint8_t v = *src++;
+ *samples = adpcm_ima_expand_nibble(cs, v & 0x0F, 4);
+ samples += avctx->channels;
+ *samples = adpcm_ima_expand_nibble(cs, v >> 4 , 4);
+ samples += avctx->channels;
+ }
+ }
+ samples -= (avctx->channels - 1);
break;
case CODEC_ID_ADPCM_MS:
+ {
+ int block_predictor;
+
if (avctx->block_align != 0 && buf_size > avctx->block_align)
buf_size = avctx->block_align;
n = buf_size - 7 * avctx->channels;
if (n < 0)
return -1;
- block_predictor[0] = av_clip(*src++, 0, 6);
- block_predictor[1] = 0;
- if (st)
- block_predictor[1] = av_clip(*src++, 0, 6);
+
+ block_predictor = av_clip(*src++, 0, 6);
+ c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
+ c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
+ if (st) {
+ block_predictor = av_clip(*src++, 0, 6);
+ c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
+ c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
+ }
c->status[0].idelta = (int16_t)bytestream_get_le16(&src);
if (st){
c->status[1].idelta = (int16_t)bytestream_get_le16(&src);
}
- c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor[0]];
- c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor[0]];
- c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor[1]];
- c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor[1]];
c->status[0].sample1 = bytestream_get_le16(&src);
if (st) c->status[1].sample1 = bytestream_get_le16(&src);
src ++;
}
break;
+ }
case CODEC_ID_ADPCM_IMA_DK4:
if (avctx->block_align != 0 && buf_size > avctx->block_align)
buf_size = avctx->block_align;
- c->status[0].predictor = (int16_t)bytestream_get_le16(&src);
- c->status[0].step_index = *src++;
- src++;
- *samples++ = c->status[0].predictor;
- if (st) {
- c->status[1].predictor = (int16_t)bytestream_get_le16(&src);
- c->status[1].step_index = *src++;
- src++;
- *samples++ = c->status[1].predictor;
+ n = buf_size - 4 * avctx->channels;
+ if (n < 0) {
+ av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
+ return AVERROR(EINVAL);
}
- while (src < buf + buf_size) {
-
- /* take care of the top nibble (always left or mono channel) */
- *samples++ = adpcm_ima_expand_nibble(&c->status[0],
- src[0] >> 4, 3);
-
- /* take care of the bottom nibble, which is right sample for
- * stereo, or another mono sample */
- if (st)
- *samples++ = adpcm_ima_expand_nibble(&c->status[1],
- src[0] & 0x0F, 3);
- else
- *samples++ = adpcm_ima_expand_nibble(&c->status[0],
- src[0] & 0x0F, 3);
+ for (channel = 0; channel < avctx->channels; channel++) {
+ cs = &c->status[channel];
+ cs->predictor = (int16_t)bytestream_get_le16(&src);
+ cs->step_index = *src++;
src++;
+ *samples++ = cs->predictor;
+ }
+ while (n-- > 0) {
+ uint8_t v = *src++;
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4 , 3);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
}
break;
case CODEC_ID_ADPCM_IMA_DK3:
}
break;
case CODEC_ID_ADPCM_IMA_ISS:
- c->status[0].predictor = (int16_t)AV_RL16(src + 0);
- c->status[0].step_index = src[2];
- src += 4;
- if(st) {
- c->status[1].predictor = (int16_t)AV_RL16(src + 0);
- c->status[1].step_index = src[2];
- src += 4;
+ n = buf_size - 4 * avctx->channels;
+ if (n < 0) {
+ av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
+ return AVERROR(EINVAL);
}
- while (src < buf + buf_size) {
+ for (channel = 0; channel < avctx->channels; channel++) {
+ cs = &c->status[channel];
+ cs->predictor = (int16_t)bytestream_get_le16(&src);
+ cs->step_index = *src++;
+ src++;
+ }
+ while (n-- > 0) {
+ uint8_t v1, v2;
+ uint8_t v = *src++;
+ /* nibbles are swapped for mono */
if (st) {
- *samples++ = adpcm_ima_expand_nibble(&c->status[0],
- src[0] >> 4 , 3);
- *samples++ = adpcm_ima_expand_nibble(&c->status[1],
- src[0] & 0x0F, 3);
+ v1 = v >> 4;
+ v2 = v & 0x0F;
} else {
- *samples++ = adpcm_ima_expand_nibble(&c->status[0],
- src[0] & 0x0F, 3);
- *samples++ = adpcm_ima_expand_nibble(&c->status[0],
- src[0] >> 4 , 3);
+ v2 = v >> 4;
+ v1 = v & 0x0F;
}
-
- src++;
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);
}
break;
case CODEC_ID_ADPCM_IMA_WS:
- /* no per-block initialization; just start decoding the data */
while (src < buf + buf_size) {
-
- if (st) {
- *samples++ = adpcm_ima_expand_nibble(&c->status[0],
- src[0] >> 4 , 3);
- *samples++ = adpcm_ima_expand_nibble(&c->status[1],
- src[0] & 0x0F, 3);
- } else {
- *samples++ = adpcm_ima_expand_nibble(&c->status[0],
- src[0] >> 4 , 3);
- *samples++ = adpcm_ima_expand_nibble(&c->status[0],
- src[0] & 0x0F, 3);
- }
-
- src++;
+ uint8_t v = *src++;
+ *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4 , 3);
+ *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
}
break;
case CODEC_ID_ADPCM_XA:
break;
case CODEC_ID_ADPCM_CT:
while (src < buf + buf_size) {
- if (st) {
- *samples++ = adpcm_ct_expand_nibble(&c->status[0],
- src[0] >> 4);
- *samples++ = adpcm_ct_expand_nibble(&c->status[1],
- src[0] & 0x0F);
- } else {
- *samples++ = adpcm_ct_expand_nibble(&c->status[0],
- src[0] >> 4);
- *samples++ = adpcm_ct_expand_nibble(&c->status[0],
- src[0] & 0x0F);
- }
- src++;
+ uint8_t v = *src++;
+ *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4 );
+ *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);
}
break;
case CODEC_ID_ADPCM_SBPRO_4:
}
case CODEC_ID_ADPCM_YAMAHA:
while (src < buf + buf_size) {
- if (st) {
- *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
- src[0] & 0x0F);
- *samples++ = adpcm_yamaha_expand_nibble(&c->status[1],
- src[0] >> 4 );
- } else {
- *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
- src[0] & 0x0F);
- *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
- src[0] >> 4 );
- }
- src++;
+ uint8_t v = *src++;
+ *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);
+ *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4 );
}
break;
case CODEC_ID_ADPCM_THP:
projects / ffmpeg / blobdiff