3 * Copyright (c) 2001-2003 The ffmpeg Project
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "bitstream.h"
23 #include "bytestream.h"
28 * First version by Francois Revol (revol@free.fr)
29 * Fringe ADPCM codecs (e.g., DK3, DK4, Westwood)
30 * by Mike Melanson (melanson@pcisys.net)
31 * CD-ROM XA ADPCM codec by BERO
32 * EA ADPCM decoder by Robin Kay (komadori@myrealbox.com)
33 * EA ADPCM R1/R2/R3 decoder by Peter Ross (pross@xvid.org)
34 * EA IMA EACS decoder by Peter Ross (pross@xvid.org)
35 * EA IMA SEAD decoder by Peter Ross (pross@xvid.org)
36 * THP ADPCM decoder by Marco Gerards (mgerards@xs4all.nl)
38 * Features and limitations:
40 * Reference documents:
41 * http://www.pcisys.net/~melanson/codecs/simpleaudio.html
42 * http://www.geocities.com/SiliconValley/8682/aud3.txt
43 * http://openquicktime.sourceforge.net/plugins.htm
44 * XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html
45 * http://www.cs.ucla.edu/~leec/mediabench/applications.html
46 * SoX source code http://home.sprynet.com/~cbagwell/sox.html
49 * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html
50 * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html
51 * readstr http://www.geocities.co.jp/Playtown/2004/
56 /* step_table[] and index_table[] are from the ADPCM reference source */
57 /* This is the index table: */
58 static const int index_table[16] = {
59 -1, -1, -1, -1, 2, 4, 6, 8,
60 -1, -1, -1, -1, 2, 4, 6, 8,
64 * This is the step table. Note that many programs use slight deviations from
65 * this table, but such deviations are negligible:
67 static const int step_table[89] = {
68 7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
69 19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
70 50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
71 130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
72 337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
73 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
74 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
75 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
76 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
79 /* These are for MS-ADPCM */
80 /* AdaptationTable[], AdaptCoeff1[], and AdaptCoeff2[] are from libsndfile */
81 static const int AdaptationTable[] = {
82 230, 230, 230, 230, 307, 409, 512, 614,
83 768, 614, 512, 409, 307, 230, 230, 230
86 static const int AdaptCoeff1[] = {
87 256, 512, 0, 192, 240, 460, 392
90 static const int AdaptCoeff2[] = {
91 0, -256, 0, 64, 0, -208, -232
94 /* These are for CD-ROM XA ADPCM */
95 static const int xa_adpcm_table[5][2] = {
103 static const int ea_adpcm_table[] = {
104 0, 240, 460, 392, 0, 0, -208, -220, 0, 1,
105 3, 4, 7, 8, 10, 11, 0, -1, -3, -4
108 static const int ct_adpcm_table[8] = {
109 0x00E6, 0x00E6, 0x00E6, 0x00E6,
110 0x0133, 0x0199, 0x0200, 0x0266
113 // padded to zero where table size is less then 16
114 static const int swf_index_tables[4][16] = {
116 /*3*/ { -1, -1, 2, 4 },
117 /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },
118 /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }
121 static const int yamaha_indexscale[] = {
122 230, 230, 230, 230, 307, 409, 512, 614,
123 230, 230, 230, 230, 307, 409, 512, 614
126 static const int yamaha_difflookup[] = {
127 1, 3, 5, 7, 9, 11, 13, 15,
128 -1, -3, -5, -7, -9, -11, -13, -15
133 typedef struct ADPCMChannelStatus {
135 short int step_index;
146 } ADPCMChannelStatus;
148 typedef struct ADPCMContext {
149 int channel; /* for stereo MOVs, decode left, then decode right, then tell it's decoded */
150 ADPCMChannelStatus status[6];
153 /* XXX: implement encoding */
155 #ifdef CONFIG_ENCODERS
156 static int adpcm_encode_init(AVCodecContext *avctx)
158 if (avctx->channels > 2)
159 return -1; /* only stereo or mono =) */
160 switch(avctx->codec->id) {
161 case CODEC_ID_ADPCM_IMA_QT:
162 av_log(avctx, AV_LOG_ERROR, "ADPCM: codec adpcm_ima_qt unsupported for encoding !\n");
163 avctx->frame_size = 64; /* XXX: can multiple of avctx->channels * 64 (left and right blocks are interleaved) */
166 case CODEC_ID_ADPCM_IMA_WAV:
167 avctx->frame_size = (BLKSIZE - 4 * avctx->channels) * 8 / (4 * avctx->channels) + 1; /* each 16 bits sample gives one nibble */
168 /* and we have 4 bytes per channel overhead */
169 avctx->block_align = BLKSIZE;
170 /* seems frame_size isn't taken into account... have to buffer the samples :-( */
172 case CODEC_ID_ADPCM_MS:
173 avctx->frame_size = (BLKSIZE - 7 * avctx->channels) * 2 / avctx->channels + 2; /* each 16 bits sample gives one nibble */
174 /* and we have 7 bytes per channel overhead */
175 avctx->block_align = BLKSIZE;
177 case CODEC_ID_ADPCM_YAMAHA:
178 avctx->frame_size = BLKSIZE * avctx->channels;
179 avctx->block_align = BLKSIZE;
181 case CODEC_ID_ADPCM_SWF:
182 if (avctx->sample_rate != 11025 &&
183 avctx->sample_rate != 22050 &&
184 avctx->sample_rate != 44100) {
185 av_log(avctx, AV_LOG_ERROR, "Sample rate must be 11025, 22050 or 44100\n");
188 avctx->frame_size = 512 * (avctx->sample_rate / 11025);
195 avctx->coded_frame= avcodec_alloc_frame();
196 avctx->coded_frame->key_frame= 1;
201 static int adpcm_encode_close(AVCodecContext *avctx)
203 av_freep(&avctx->coded_frame);
209 static inline unsigned char adpcm_ima_compress_sample(ADPCMChannelStatus *c, short sample)
211 int delta = sample - c->prev_sample;
212 int nibble = FFMIN(7, abs(delta)*4/step_table[c->step_index]) + (delta<0)*8;
213 c->prev_sample += ((step_table[c->step_index] * yamaha_difflookup[nibble]) / 8);
214 c->prev_sample = av_clip_int16(c->prev_sample);
215 c->step_index = av_clip(c->step_index + index_table[nibble], 0, 88);
219 static inline unsigned char adpcm_ms_compress_sample(ADPCMChannelStatus *c, short sample)
221 int predictor, nibble, bias;
223 predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
225 nibble= sample - predictor;
226 if(nibble>=0) bias= c->idelta/2;
227 else bias=-c->idelta/2;
229 nibble= (nibble + bias) / c->idelta;
230 nibble= av_clip(nibble, -8, 7)&0x0F;
232 predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
234 c->sample2 = c->sample1;
235 c->sample1 = av_clip_int16(predictor);
237 c->idelta = (AdaptationTable[(int)nibble] * c->idelta) >> 8;
238 if (c->idelta < 16) c->idelta = 16;
243 static inline unsigned char adpcm_yamaha_compress_sample(ADPCMChannelStatus *c, short sample)
252 delta = sample - c->predictor;
254 nibble = FFMIN(7, abs(delta)*4/c->step) + (delta<0)*8;
256 c->predictor += ((c->step * yamaha_difflookup[nibble]) / 8);
257 c->predictor = av_clip_int16(c->predictor);
258 c->step = (c->step * yamaha_indexscale[nibble]) >> 8;
259 c->step = av_clip(c->step, 127, 24567);
264 typedef struct TrellisPath {
269 typedef struct TrellisNode {
277 static void adpcm_compress_trellis(AVCodecContext *avctx, const short *samples,
278 uint8_t *dst, ADPCMChannelStatus *c, int n)
280 #define FREEZE_INTERVAL 128
281 //FIXME 6% faster if frontier is a compile-time constant
282 const int frontier = 1 << avctx->trellis;
283 const int stride = avctx->channels;
284 const int version = avctx->codec->id;
285 const int max_paths = frontier*FREEZE_INTERVAL;
286 TrellisPath paths[max_paths], *p;
287 TrellisNode node_buf[2][frontier];
288 TrellisNode *nodep_buf[2][frontier];
289 TrellisNode **nodes = nodep_buf[0]; // nodes[] is always sorted by .ssd
290 TrellisNode **nodes_next = nodep_buf[1];
291 int pathn = 0, froze = -1, i, j, k;
293 assert(!(max_paths&(max_paths-1)));
295 memset(nodep_buf, 0, sizeof(nodep_buf));
296 nodes[0] = &node_buf[1][0];
299 nodes[0]->step = c->step_index;
300 nodes[0]->sample1 = c->sample1;
301 nodes[0]->sample2 = c->sample2;
302 if((version == CODEC_ID_ADPCM_IMA_WAV) || (version == CODEC_ID_ADPCM_SWF))
303 nodes[0]->sample1 = c->prev_sample;
304 if(version == CODEC_ID_ADPCM_MS)
305 nodes[0]->step = c->idelta;
306 if(version == CODEC_ID_ADPCM_YAMAHA) {
308 nodes[0]->step = 127;
309 nodes[0]->sample1 = 0;
311 nodes[0]->step = c->step;
312 nodes[0]->sample1 = c->predictor;
317 TrellisNode *t = node_buf[i&1];
319 int sample = samples[i*stride];
320 memset(nodes_next, 0, frontier*sizeof(TrellisNode*));
321 for(j=0; j<frontier && nodes[j]; j++) {
322 // higher j have higher ssd already, so they're unlikely to use a suboptimal next sample too
323 const int range = (j < frontier/2) ? 1 : 0;
324 const int step = nodes[j]->step;
326 if(version == CODEC_ID_ADPCM_MS) {
327 const int predictor = ((nodes[j]->sample1 * c->coeff1) + (nodes[j]->sample2 * c->coeff2)) / 256;
328 const int div = (sample - predictor) / step;
329 const int nmin = av_clip(div-range, -8, 6);
330 const int nmax = av_clip(div+range, -7, 7);
331 for(nidx=nmin; nidx<=nmax; nidx++) {
332 const int nibble = nidx & 0xf;
333 int dec_sample = predictor + nidx * step;
334 #define STORE_NODE(NAME, STEP_INDEX)\
337 dec_sample = av_clip_int16(dec_sample);\
338 d = sample - dec_sample;\
339 ssd = nodes[j]->ssd + d*d;\
340 if(nodes_next[frontier-1] && ssd >= nodes_next[frontier-1]->ssd)\
342 /* Collapse any two states with the same previous sample value. \
343 * One could also distinguish states by step and by 2nd to last
344 * sample, but the effects of that are negligible. */\
345 for(k=0; k<frontier && nodes_next[k]; k++) {\
346 if(dec_sample == nodes_next[k]->sample1) {\
347 assert(ssd >= nodes_next[k]->ssd);\
351 for(k=0; k<frontier; k++) {\
352 if(!nodes_next[k] || ssd < nodes_next[k]->ssd) {\
353 TrellisNode *u = nodes_next[frontier-1];\
355 assert(pathn < max_paths);\
360 u->step = STEP_INDEX;\
361 u->sample2 = nodes[j]->sample1;\
362 u->sample1 = dec_sample;\
363 paths[u->path].nibble = nibble;\
364 paths[u->path].prev = nodes[j]->path;\
365 memmove(&nodes_next[k+1], &nodes_next[k], (frontier-k-1)*sizeof(TrellisNode*));\
371 STORE_NODE(ms, FFMAX(16, (AdaptationTable[nibble] * step) >> 8));
373 } else if((version == CODEC_ID_ADPCM_IMA_WAV)|| (version == CODEC_ID_ADPCM_SWF)) {
374 #define LOOP_NODES(NAME, STEP_TABLE, STEP_INDEX)\
375 const int predictor = nodes[j]->sample1;\
376 const int div = (sample - predictor) * 4 / STEP_TABLE;\
377 int nmin = av_clip(div-range, -7, 6);\
378 int nmax = av_clip(div+range, -6, 7);\
379 if(nmin<=0) nmin--; /* distinguish -0 from +0 */\
381 for(nidx=nmin; nidx<=nmax; nidx++) {\
382 const int nibble = nidx<0 ? 7-nidx : nidx;\
383 int dec_sample = predictor + (STEP_TABLE * yamaha_difflookup[nibble]) / 8;\
384 STORE_NODE(NAME, STEP_INDEX);\
386 LOOP_NODES(ima, step_table[step], av_clip(step + index_table[nibble], 0, 88));
387 } else { //CODEC_ID_ADPCM_YAMAHA
388 LOOP_NODES(yamaha, step, av_clip((step * yamaha_indexscale[nibble]) >> 8, 127, 24567));
399 if(nodes[0]->ssd > (1<<28)) {
400 for(j=1; j<frontier && nodes[j]; j++)
401 nodes[j]->ssd -= nodes[0]->ssd;
405 // merge old paths to save memory
406 if(i == froze + FREEZE_INTERVAL) {
407 p = &paths[nodes[0]->path];
408 for(k=i; k>froze; k--) {
414 // other nodes might use paths that don't coincide with the frozen one.
415 // checking which nodes do so is too slow, so just kill them all.
416 // this also slightly improves quality, but I don't know why.
417 memset(nodes+1, 0, (frontier-1)*sizeof(TrellisNode*));
421 p = &paths[nodes[0]->path];
422 for(i=n-1; i>froze; i--) {
427 c->predictor = nodes[0]->sample1;
428 c->sample1 = nodes[0]->sample1;
429 c->sample2 = nodes[0]->sample2;
430 c->step_index = nodes[0]->step;
431 c->step = nodes[0]->step;
432 c->idelta = nodes[0]->step;
435 static int adpcm_encode_frame(AVCodecContext *avctx,
436 unsigned char *frame, int buf_size, void *data)
441 ADPCMContext *c = avctx->priv_data;
444 samples = (short *)data;
445 st= avctx->channels == 2;
446 /* n = (BLKSIZE - 4 * avctx->channels) / (2 * 8 * avctx->channels); */
448 switch(avctx->codec->id) {
449 case CODEC_ID_ADPCM_IMA_QT: /* XXX: can't test until we get .mov writer */
451 case CODEC_ID_ADPCM_IMA_WAV:
452 n = avctx->frame_size / 8;
453 c->status[0].prev_sample = (signed short)samples[0]; /* XXX */
454 /* c->status[0].step_index = 0; *//* XXX: not sure how to init the state machine */
455 bytestream_put_le16(&dst, c->status[0].prev_sample);
456 *dst++ = (unsigned char)c->status[0].step_index;
457 *dst++ = 0; /* unknown */
459 if (avctx->channels == 2) {
460 c->status[1].prev_sample = (signed short)samples[1];
461 /* c->status[1].step_index = 0; */
462 bytestream_put_le16(&dst, c->status[1].prev_sample);
463 *dst++ = (unsigned char)c->status[1].step_index;
468 /* stereo: 4 bytes (8 samples) for left, 4 bytes for right, 4 bytes left, ... */
469 if(avctx->trellis > 0) {
471 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n*8);
472 if(avctx->channels == 2)
473 adpcm_compress_trellis(avctx, samples+1, buf[1], &c->status[1], n*8);
475 *dst++ = buf[0][8*i+0] | (buf[0][8*i+1] << 4);
476 *dst++ = buf[0][8*i+2] | (buf[0][8*i+3] << 4);
477 *dst++ = buf[0][8*i+4] | (buf[0][8*i+5] << 4);
478 *dst++ = buf[0][8*i+6] | (buf[0][8*i+7] << 4);
479 if (avctx->channels == 2) {
480 *dst++ = buf[1][8*i+0] | (buf[1][8*i+1] << 4);
481 *dst++ = buf[1][8*i+2] | (buf[1][8*i+3] << 4);
482 *dst++ = buf[1][8*i+4] | (buf[1][8*i+5] << 4);
483 *dst++ = buf[1][8*i+6] | (buf[1][8*i+7] << 4);
488 *dst = adpcm_ima_compress_sample(&c->status[0], samples[0]);
489 *dst |= adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels]) << 4;
491 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 2]);
492 *dst |= adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 3]) << 4;
494 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 4]);
495 *dst |= adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 5]) << 4;
497 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 6]);
498 *dst |= adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 7]) << 4;
501 if (avctx->channels == 2) {
502 *dst = adpcm_ima_compress_sample(&c->status[1], samples[1]);
503 *dst |= adpcm_ima_compress_sample(&c->status[1], samples[3]) << 4;
505 *dst = adpcm_ima_compress_sample(&c->status[1], samples[5]);
506 *dst |= adpcm_ima_compress_sample(&c->status[1], samples[7]) << 4;
508 *dst = adpcm_ima_compress_sample(&c->status[1], samples[9]);
509 *dst |= adpcm_ima_compress_sample(&c->status[1], samples[11]) << 4;
511 *dst = adpcm_ima_compress_sample(&c->status[1], samples[13]);
512 *dst |= adpcm_ima_compress_sample(&c->status[1], samples[15]) << 4;
515 samples += 8 * avctx->channels;
518 case CODEC_ID_ADPCM_SWF:
522 init_put_bits(&pb, dst, buf_size*8);
524 n = avctx->frame_size-1;
526 //Store AdpcmCodeSize
527 put_bits(&pb, 2, 2); //Set 4bits flash adpcm format
529 //Init the encoder state
530 for(i=0; i<avctx->channels; i++){
531 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 63); // clip step so it fits 6 bits
532 put_bits(&pb, 16, samples[i] & 0xFFFF);
533 put_bits(&pb, 6, c->status[i].step_index);
534 c->status[i].prev_sample = (signed short)samples[i];
537 if(avctx->trellis > 0) {
539 adpcm_compress_trellis(avctx, samples+2, buf[0], &c->status[0], n);
540 if (avctx->channels == 2)
541 adpcm_compress_trellis(avctx, samples+3, buf[1], &c->status[1], n);
543 put_bits(&pb, 4, buf[0][i]);
544 if (avctx->channels == 2)
545 put_bits(&pb, 4, buf[1][i]);
548 for (i=1; i<avctx->frame_size; i++) {
549 put_bits(&pb, 4, adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels*i]));
550 if (avctx->channels == 2)
551 put_bits(&pb, 4, adpcm_ima_compress_sample(&c->status[1], samples[2*i+1]));
555 dst += put_bits_count(&pb)>>3;
558 case CODEC_ID_ADPCM_MS:
559 for(i=0; i<avctx->channels; i++){
563 c->status[i].coeff1 = AdaptCoeff1[predictor];
564 c->status[i].coeff2 = AdaptCoeff2[predictor];
566 for(i=0; i<avctx->channels; i++){
567 if (c->status[i].idelta < 16)
568 c->status[i].idelta = 16;
570 bytestream_put_le16(&dst, c->status[i].idelta);
572 for(i=0; i<avctx->channels; i++){
573 c->status[i].sample1= *samples++;
575 bytestream_put_le16(&dst, c->status[i].sample1);
577 for(i=0; i<avctx->channels; i++){
578 c->status[i].sample2= *samples++;
580 bytestream_put_le16(&dst, c->status[i].sample2);
583 if(avctx->trellis > 0) {
584 int n = avctx->block_align - 7*avctx->channels;
586 if(avctx->channels == 1) {
588 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);
590 *dst++ = (buf[0][i] << 4) | buf[0][i+1];
592 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);
593 adpcm_compress_trellis(avctx, samples+1, buf[1], &c->status[1], n);
595 *dst++ = (buf[0][i] << 4) | buf[1][i];
598 for(i=7*avctx->channels; i<avctx->block_align; i++) {
600 nibble = adpcm_ms_compress_sample(&c->status[ 0], *samples++)<<4;
601 nibble|= adpcm_ms_compress_sample(&c->status[st], *samples++);
605 case CODEC_ID_ADPCM_YAMAHA:
606 n = avctx->frame_size / 2;
607 if(avctx->trellis > 0) {
610 if(avctx->channels == 1) {
611 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);
613 *dst++ = buf[0][i] | (buf[0][i+1] << 4);
615 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);
616 adpcm_compress_trellis(avctx, samples+1, buf[1], &c->status[1], n);
618 *dst++ = buf[0][i] | (buf[1][i] << 4);
622 for(i = 0; i < avctx->channels; i++) {
624 nibble = adpcm_yamaha_compress_sample(&c->status[i], samples[i]);
625 nibble |= adpcm_yamaha_compress_sample(&c->status[i], samples[i+avctx->channels]) << 4;
628 samples += 2 * avctx->channels;
636 #endif //CONFIG_ENCODERS
638 static int adpcm_decode_init(AVCodecContext * avctx)
640 ADPCMContext *c = avctx->priv_data;
641 unsigned int max_channels = 2;
643 switch(avctx->codec->id) {
644 case CODEC_ID_ADPCM_EA_R1:
645 case CODEC_ID_ADPCM_EA_R2:
646 case CODEC_ID_ADPCM_EA_R3:
650 if(avctx->channels > max_channels){
654 switch(avctx->codec->id) {
655 case CODEC_ID_ADPCM_CT:
656 c->status[0].step = c->status[1].step = 511;
658 case CODEC_ID_ADPCM_IMA_WS:
659 if (avctx->extradata && avctx->extradata_size == 2 * 4) {
660 c->status[0].predictor = AV_RL32(avctx->extradata);
661 c->status[1].predictor = AV_RL32(avctx->extradata + 4);
670 static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)
674 int sign, delta, diff, step;
676 step = step_table[c->step_index];
677 step_index = c->step_index + index_table[(unsigned)nibble];
678 if (step_index < 0) step_index = 0;
679 else if (step_index > 88) step_index = 88;
683 /* perform direct multiplication instead of series of jumps proposed by
684 * the reference ADPCM implementation since modern CPUs can do the mults
686 diff = ((2 * delta + 1) * step) >> shift;
687 predictor = c->predictor;
688 if (sign) predictor -= diff;
689 else predictor += diff;
691 c->predictor = av_clip_int16(predictor);
692 c->step_index = step_index;
694 return (short)c->predictor;
697 static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
701 predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
702 predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
704 c->sample2 = c->sample1;
705 c->sample1 = av_clip_int16(predictor);
706 c->idelta = (AdaptationTable[(int)nibble] * c->idelta) >> 8;
707 if (c->idelta < 16) c->idelta = 16;
712 static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)
714 int sign, delta, diff;
719 /* perform direct multiplication instead of series of jumps proposed by
720 * the reference ADPCM implementation since modern CPUs can do the mults
722 diff = ((2 * delta + 1) * c->step) >> 3;
723 /* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */
724 c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);
725 c->predictor = av_clip_int16(c->predictor);
726 /* calculate new step and clamp it to range 511..32767 */
727 new_step = (ct_adpcm_table[nibble & 7] * c->step) >> 8;
728 c->step = av_clip(new_step, 511, 32767);
730 return (short)c->predictor;
733 static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)
735 int sign, delta, diff;
737 sign = nibble & (1<<(size-1));
738 delta = nibble & ((1<<(size-1))-1);
739 diff = delta << (7 + c->step + shift);
742 c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);
744 /* calculate new step */
745 if (delta >= (2*size - 3) && c->step < 3)
747 else if (delta == 0 && c->step > 0)
750 return (short) c->predictor;
753 static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)
760 c->predictor += (c->step * yamaha_difflookup[nibble]) / 8;
761 c->predictor = av_clip_int16(c->predictor);
762 c->step = (c->step * yamaha_indexscale[nibble]) >> 8;
763 c->step = av_clip(c->step, 127, 24567);
767 static void xa_decode(short *out, const unsigned char *in,
768 ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)
771 int shift,filter,f0,f1;
777 shift = 12 - (in[4+i*2] & 15);
778 filter = in[4+i*2] >> 4;
779 f0 = xa_adpcm_table[filter][0];
780 f1 = xa_adpcm_table[filter][1];
788 t = (signed char)(d<<4)>>4;
789 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
791 s_1 = av_clip_int16(s);
796 if (inc==2) { /* stereo */
799 s_1 = right->sample1;
800 s_2 = right->sample2;
801 out = out + 1 - 28*2;
804 shift = 12 - (in[5+i*2] & 15);
805 filter = in[5+i*2] >> 4;
807 f0 = xa_adpcm_table[filter][0];
808 f1 = xa_adpcm_table[filter][1];
813 t = (signed char)d >> 4;
814 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
816 s_1 = av_clip_int16(s);
821 if (inc==2) { /* stereo */
822 right->sample1 = s_1;
823 right->sample2 = s_2;
833 /* DK3 ADPCM support macro */
834 #define DK3_GET_NEXT_NIBBLE() \
835 if (decode_top_nibble_next) \
837 nibble = (last_byte >> 4) & 0x0F; \
838 decode_top_nibble_next = 0; \
842 last_byte = *src++; \
843 if (src >= buf + buf_size) break; \
844 nibble = last_byte & 0x0F; \
845 decode_top_nibble_next = 1; \
848 static int adpcm_decode_frame(AVCodecContext *avctx,
849 void *data, int *data_size,
850 uint8_t *buf, int buf_size)
852 ADPCMContext *c = avctx->priv_data;
853 ADPCMChannelStatus *cs;
854 int n, m, channel, i;
855 int block_predictor[2];
861 /* DK3 ADPCM accounting variables */
862 unsigned char last_byte = 0;
863 unsigned char nibble;
864 int decode_top_nibble_next = 0;
867 /* EA ADPCM state variables */
868 uint32_t samples_in_chunk;
869 int32_t previous_left_sample, previous_right_sample;
870 int32_t current_left_sample, current_right_sample;
871 int32_t next_left_sample, next_right_sample;
872 int32_t coeff1l, coeff2l, coeff1r, coeff2r;
873 uint8_t shift_left, shift_right;
879 //should protect all 4bit ADPCM variants
880 //8 is needed for CODEC_ID_ADPCM_IMA_WAV with 2 channels
882 if(*data_size/4 < buf_size + 8)
886 samples_end= samples + *data_size/2;
890 st = avctx->channels == 2 ? 1 : 0;
892 switch(avctx->codec->id) {
893 case CODEC_ID_ADPCM_IMA_QT:
894 n = (buf_size - 2);/* >> 2*avctx->channels;*/
895 channel = c->channel;
896 cs = &(c->status[channel]);
897 /* (pppppp) (piiiiiii) */
899 /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
900 cs->predictor = (*src++) << 8;
901 cs->predictor |= (*src & 0x80);
902 cs->predictor &= 0xFF80;
905 if(cs->predictor & 0x8000)
906 cs->predictor -= 0x10000;
908 cs->predictor = av_clip_int16(cs->predictor);
910 cs->step_index = (*src++) & 0x7F;
912 if (cs->step_index > 88){
913 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
917 cs->step = step_table[cs->step_index];
922 for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */
923 *samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F, 3);
924 samples += avctx->channels;
925 *samples = adpcm_ima_expand_nibble(cs, (src[0] >> 4) & 0x0F, 3);
926 samples += avctx->channels;
930 if(st) { /* handle stereo interlacing */
931 c->channel = (channel + 1) % 2; /* we get one packet for left, then one for right data */
932 if(channel == 1) { /* wait for the other packet before outputing anything */
937 case CODEC_ID_ADPCM_IMA_WAV:
938 if (avctx->block_align != 0 && buf_size > avctx->block_align)
939 buf_size = avctx->block_align;
941 // samples_per_block= (block_align-4*chanels)*8 / (bits_per_sample * chanels) + 1;
943 for(i=0; i<avctx->channels; i++){
944 cs = &(c->status[i]);
945 cs->predictor = (int16_t)(src[0] + (src[1]<<8));
948 // XXX: is this correct ??: *samples++ = cs->predictor;
950 cs->step_index = *src++;
951 if (cs->step_index > 88){
952 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
955 if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null but is %d!!\n", src[-1]); /* unused */
958 while(src < buf + buf_size){
961 *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] & 0x0F, 3);
963 *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] >> 4 , 3);
969 case CODEC_ID_ADPCM_4XM:
970 cs = &(c->status[0]);
971 c->status[0].predictor= (int16_t)(src[0] + (src[1]<<8)); src+=2;
973 c->status[1].predictor= (int16_t)(src[0] + (src[1]<<8)); src+=2;
975 c->status[0].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;
977 c->status[1].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;
979 if (cs->step_index < 0) cs->step_index = 0;
980 if (cs->step_index > 88) cs->step_index = 88;
982 m= (buf_size - (src - buf))>>st;
984 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] & 0x0F, 4);
986 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] & 0x0F, 4);
987 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] >> 4, 4);
989 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] >> 4, 4);
995 case CODEC_ID_ADPCM_MS:
996 if (avctx->block_align != 0 && buf_size > avctx->block_align)
997 buf_size = avctx->block_align;
998 n = buf_size - 7 * avctx->channels;
1001 block_predictor[0] = av_clip(*src++, 0, 7);
1002 block_predictor[1] = 0;
1004 block_predictor[1] = av_clip(*src++, 0, 7);
1005 c->status[0].idelta = (int16_t)((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
1008 c->status[1].idelta = (int16_t)((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
1011 c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];
1012 c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];
1013 c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];
1014 c->status[1].coeff2 = AdaptCoeff2[block_predictor[1]];
1016 c->status[0].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
1018 if (st) c->status[1].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
1020 c->status[0].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
1022 if (st) c->status[1].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
1025 *samples++ = c->status[0].sample1;
1026 if (st) *samples++ = c->status[1].sample1;
1027 *samples++ = c->status[0].sample2;
1028 if (st) *samples++ = c->status[1].sample2;
1030 *samples++ = adpcm_ms_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);
1031 *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
1035 case CODEC_ID_ADPCM_IMA_DK4:
1036 if (avctx->block_align != 0 && buf_size > avctx->block_align)
1037 buf_size = avctx->block_align;
1039 c->status[0].predictor = (int16_t)(src[0] | (src[1] << 8));
1040 c->status[0].step_index = src[2];
1042 *samples++ = c->status[0].predictor;
1044 c->status[1].predictor = (int16_t)(src[0] | (src[1] << 8));
1045 c->status[1].step_index = src[2];
1047 *samples++ = c->status[1].predictor;
1049 while (src < buf + buf_size) {
1051 /* take care of the top nibble (always left or mono channel) */
1052 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1053 (src[0] >> 4) & 0x0F, 3);
1055 /* take care of the bottom nibble, which is right sample for
1056 * stereo, or another mono sample */
1058 *samples++ = adpcm_ima_expand_nibble(&c->status[1],
1061 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1067 case CODEC_ID_ADPCM_IMA_DK3:
1068 if (avctx->block_align != 0 && buf_size > avctx->block_align)
1069 buf_size = avctx->block_align;
1071 if(buf_size + 16 > (samples_end - samples)*3/8)
1074 c->status[0].predictor = (int16_t)(src[10] | (src[11] << 8));
1075 c->status[1].predictor = (int16_t)(src[12] | (src[13] << 8));
1076 c->status[0].step_index = src[14];
1077 c->status[1].step_index = src[15];
1078 /* sign extend the predictors */
1080 diff_channel = c->status[1].predictor;
1082 /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when
1083 * the buffer is consumed */
1086 /* for this algorithm, c->status[0] is the sum channel and
1087 * c->status[1] is the diff channel */
1089 /* process the first predictor of the sum channel */
1090 DK3_GET_NEXT_NIBBLE();
1091 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
1093 /* process the diff channel predictor */
1094 DK3_GET_NEXT_NIBBLE();
1095 adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
1097 /* process the first pair of stereo PCM samples */
1098 diff_channel = (diff_channel + c->status[1].predictor) / 2;
1099 *samples++ = c->status[0].predictor + c->status[1].predictor;
1100 *samples++ = c->status[0].predictor - c->status[1].predictor;
1102 /* process the second predictor of the sum channel */
1103 DK3_GET_NEXT_NIBBLE();
1104 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
1106 /* process the second pair of stereo PCM samples */
1107 diff_channel = (diff_channel + c->status[1].predictor) / 2;
1108 *samples++ = c->status[0].predictor + c->status[1].predictor;
1109 *samples++ = c->status[0].predictor - c->status[1].predictor;
1112 case CODEC_ID_ADPCM_IMA_WS:
1113 /* no per-block initialization; just start decoding the data */
1114 while (src < buf + buf_size) {
1117 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1118 (src[0] >> 4) & 0x0F, 3);
1119 *samples++ = adpcm_ima_expand_nibble(&c->status[1],
1122 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1123 (src[0] >> 4) & 0x0F, 3);
1124 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1131 case CODEC_ID_ADPCM_XA:
1132 c->status[0].sample1 = c->status[0].sample2 =
1133 c->status[1].sample1 = c->status[1].sample2 = 0;
1134 while (buf_size >= 128) {
1135 xa_decode(samples, src, &c->status[0], &c->status[1],
1142 case CODEC_ID_ADPCM_IMA_EA_EACS:
1143 samples_in_chunk = bytestream_get_le32(&src) >> (1-st);
1145 if (samples_in_chunk > buf_size-4-(8<<st)) {
1146 src += buf_size - 4;
1150 for (i=0; i<=st; i++)
1151 c->status[i].step_index = bytestream_get_le32(&src);
1152 for (i=0; i<=st; i++)
1153 c->status[i].predictor = bytestream_get_le32(&src);
1155 for (; samples_in_chunk; samples_in_chunk--, src++) {
1156 *samples++ = adpcm_ima_expand_nibble(&c->status[0], *src>>4, 3);
1157 *samples++ = adpcm_ima_expand_nibble(&c->status[st], *src&0x0F, 3);
1160 case CODEC_ID_ADPCM_IMA_EA_SEAD:
1161 for (; src < buf+buf_size; src++) {
1162 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] >> 4, 6);
1163 *samples++ = adpcm_ima_expand_nibble(&c->status[st],src[0]&0x0F, 6);
1166 case CODEC_ID_ADPCM_EA:
1167 samples_in_chunk = AV_RL32(src);
1168 if (samples_in_chunk >= ((buf_size - 12) * 2)) {
1173 current_left_sample = (int16_t)AV_RL16(src);
1175 previous_left_sample = (int16_t)AV_RL16(src);
1177 current_right_sample = (int16_t)AV_RL16(src);
1179 previous_right_sample = (int16_t)AV_RL16(src);
1182 for (count1 = 0; count1 < samples_in_chunk/28;count1++) {
1183 coeff1l = ea_adpcm_table[(*src >> 4) & 0x0F];
1184 coeff2l = ea_adpcm_table[((*src >> 4) & 0x0F) + 4];
1185 coeff1r = ea_adpcm_table[*src & 0x0F];
1186 coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];
1189 shift_left = ((*src >> 4) & 0x0F) + 8;
1190 shift_right = (*src & 0x0F) + 8;
1193 for (count2 = 0; count2 < 28; count2++) {
1194 next_left_sample = (((*src & 0xF0) << 24) >> shift_left);
1195 next_right_sample = (((*src & 0x0F) << 28) >> shift_right);
1198 next_left_sample = (next_left_sample +
1199 (current_left_sample * coeff1l) +
1200 (previous_left_sample * coeff2l) + 0x80) >> 8;
1201 next_right_sample = (next_right_sample +
1202 (current_right_sample * coeff1r) +
1203 (previous_right_sample * coeff2r) + 0x80) >> 8;
1205 previous_left_sample = current_left_sample;
1206 current_left_sample = av_clip_int16(next_left_sample);
1207 previous_right_sample = current_right_sample;
1208 current_right_sample = av_clip_int16(next_right_sample);
1209 *samples++ = (unsigned short)current_left_sample;
1210 *samples++ = (unsigned short)current_right_sample;
1214 case CODEC_ID_ADPCM_EA_R1:
1215 case CODEC_ID_ADPCM_EA_R2:
1216 case CODEC_ID_ADPCM_EA_R3: {
1217 /* channel numbering
1219 4chan: 0=fl, 1=rl, 2=fr, 3=rr
1220 6chan: 0=fl, 1=c, 2=fr, 3=rl, 4=rr, 5=sub */
1221 const int big_endian = avctx->codec->id == CODEC_ID_ADPCM_EA_R3;
1222 int32_t previous_sample, current_sample, next_sample;
1223 int32_t coeff1, coeff2;
1225 unsigned int channel;
1229 samples_in_chunk = (big_endian ? bytestream_get_be32(&src)
1230 : bytestream_get_le32(&src)) / 28;
1231 if (samples_in_chunk > UINT32_MAX/(28*avctx->channels) ||
1232 28*samples_in_chunk*avctx->channels > samples_end-samples) {
1233 src += buf_size - 4;
1237 for (channel=0; channel<avctx->channels; channel++) {
1238 srcC = src + (big_endian ? bytestream_get_be32(&src)
1239 : bytestream_get_le32(&src))
1240 + (avctx->channels-channel-1) * 4;
1241 samplesC = samples + channel;
1243 if (avctx->codec->id == CODEC_ID_ADPCM_EA_R1) {
1244 current_sample = (int16_t)bytestream_get_le16(&srcC);
1245 previous_sample = (int16_t)bytestream_get_le16(&srcC);
1247 current_sample = c->status[channel].predictor;
1248 previous_sample = c->status[channel].prev_sample;
1251 for (count1=0; count1<samples_in_chunk; count1++) {
1252 if (*srcC == 0xEE) { /* only seen in R2 and R3 */
1254 current_sample = (int16_t)bytestream_get_be16(&srcC);
1255 previous_sample = (int16_t)bytestream_get_be16(&srcC);
1257 for (count2=0; count2<28; count2++) {
1258 *samplesC = (int16_t)bytestream_get_be16(&srcC);
1259 samplesC += avctx->channels;
1262 coeff1 = ea_adpcm_table[ (*srcC>>4) & 0x0F ];
1263 coeff2 = ea_adpcm_table[((*srcC>>4) & 0x0F) + 4];
1264 shift = (*srcC++ & 0x0F) + 8;
1266 for (count2=0; count2<28; count2++) {
1268 next_sample = ((*srcC++ & 0x0F) << 28) >> shift;
1270 next_sample = ((*srcC & 0xF0) << 24) >> shift;
1272 next_sample += (current_sample * coeff1) +
1273 (previous_sample * coeff2);
1274 next_sample = av_clip_int16(next_sample >> 8);
1276 previous_sample = current_sample;
1277 current_sample = next_sample;
1278 *samplesC = current_sample;
1279 samplesC += avctx->channels;
1284 if (avctx->codec->id != CODEC_ID_ADPCM_EA_R1) {
1285 c->status[channel].predictor = current_sample;
1286 c->status[channel].prev_sample = previous_sample;
1290 src = src + buf_size - (4 + 4*avctx->channels);
1291 samples += 28 * samples_in_chunk * avctx->channels;
1294 case CODEC_ID_ADPCM_IMA_AMV:
1295 case CODEC_ID_ADPCM_IMA_SMJPEG:
1296 c->status[0].predictor = (int16_t)bytestream_get_le16(&src);
1297 c->status[0].step_index = bytestream_get_le16(&src);
1299 if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
1302 while (src < buf + buf_size) {
1305 hi = (*src >> 4) & 0x0F;
1307 if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
1308 FFSWAP(char, hi, lo);
1310 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1312 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1317 case CODEC_ID_ADPCM_CT:
1318 while (src < buf + buf_size) {
1320 *samples++ = adpcm_ct_expand_nibble(&c->status[0],
1321 (src[0] >> 4) & 0x0F);
1322 *samples++ = adpcm_ct_expand_nibble(&c->status[1],
1325 *samples++ = adpcm_ct_expand_nibble(&c->status[0],
1326 (src[0] >> 4) & 0x0F);
1327 *samples++ = adpcm_ct_expand_nibble(&c->status[0],
1333 case CODEC_ID_ADPCM_SBPRO_4:
1334 case CODEC_ID_ADPCM_SBPRO_3:
1335 case CODEC_ID_ADPCM_SBPRO_2:
1336 if (!c->status[0].step_index) {
1337 /* the first byte is a raw sample */
1338 *samples++ = 128 * (*src++ - 0x80);
1340 *samples++ = 128 * (*src++ - 0x80);
1341 c->status[0].step_index = 1;
1343 if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {
1344 while (src < buf + buf_size) {
1345 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1346 (src[0] >> 4) & 0x0F, 4, 0);
1347 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1348 src[0] & 0x0F, 4, 0);
1351 } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {
1352 while (src < buf + buf_size && samples + 2 < samples_end) {
1353 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1354 (src[0] >> 5) & 0x07, 3, 0);
1355 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1356 (src[0] >> 2) & 0x07, 3, 0);
1357 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1358 src[0] & 0x03, 2, 0);
1362 while (src < buf + buf_size && samples + 3 < samples_end) {
1363 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1364 (src[0] >> 6) & 0x03, 2, 2);
1365 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1366 (src[0] >> 4) & 0x03, 2, 2);
1367 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1368 (src[0] >> 2) & 0x03, 2, 2);
1369 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1370 src[0] & 0x03, 2, 2);
1375 case CODEC_ID_ADPCM_SWF:
1379 int k0, signmask, nb_bits, count;
1380 int size = buf_size*8;
1382 init_get_bits(&gb, buf, size);
1384 //read bits & initial values
1385 nb_bits = get_bits(&gb, 2)+2;
1386 //av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits);
1387 table = swf_index_tables[nb_bits-2];
1388 k0 = 1 << (nb_bits-2);
1389 signmask = 1 << (nb_bits-1);
1391 while (get_bits_count(&gb) <= size - 22*avctx->channels) {
1392 for (i = 0; i < avctx->channels; i++) {
1393 *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
1394 c->status[i].step_index = get_bits(&gb, 6);
1397 for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {
1400 for (i = 0; i < avctx->channels; i++) {
1401 // similar to IMA adpcm
1402 int delta = get_bits(&gb, nb_bits);
1403 int step = step_table[c->status[i].step_index];
1404 long vpdiff = 0; // vpdiff = (delta+0.5)*step/4
1415 if (delta & signmask)
1416 c->status[i].predictor -= vpdiff;
1418 c->status[i].predictor += vpdiff;
1420 c->status[i].step_index += table[delta & (~signmask)];
1422 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
1423 c->status[i].predictor = av_clip_int16(c->status[i].predictor);
1425 *samples++ = c->status[i].predictor;
1426 if (samples >= samples_end) {
1427 av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");
1436 case CODEC_ID_ADPCM_YAMAHA:
1437 while (src < buf + buf_size) {
1439 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
1441 *samples++ = adpcm_yamaha_expand_nibble(&c->status[1],
1442 (src[0] >> 4) & 0x0F);
1444 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
1446 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
1447 (src[0] >> 4) & 0x0F);
1452 case CODEC_ID_ADPCM_THP:
1455 unsigned int samplecnt;
1459 if (buf_size < 80) {
1460 av_log(avctx, AV_LOG_ERROR, "frame too small\n");
1465 samplecnt = bytestream_get_be32(&src);
1467 for (i = 0; i < 32; i++)
1468 table[0][i] = (int16_t)bytestream_get_be16(&src);
1470 /* Initialize the previous sample. */
1471 for (i = 0; i < 4; i++)
1472 prev[0][i] = (int16_t)bytestream_get_be16(&src);
1474 if (samplecnt >= (samples_end - samples) / (st + 1)) {
1475 av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");
1479 for (ch = 0; ch <= st; ch++) {
1480 samples = (unsigned short *) data + ch;
1482 /* Read in every sample for this channel. */
1483 for (i = 0; i < samplecnt / 14; i++) {
1484 int index = (*src >> 4) & 7;
1485 unsigned int exp = 28 - (*src++ & 15);
1486 int factor1 = table[ch][index * 2];
1487 int factor2 = table[ch][index * 2 + 1];
1489 /* Decode 14 samples. */
1490 for (n = 0; n < 14; n++) {
1492 if(n&1) sampledat= *src++ <<28;
1493 else sampledat= (*src&0xF0)<<24;
1495 sampledat = ((prev[ch][0]*factor1
1496 + prev[ch][1]*factor2) >> 11) + (sampledat>>exp);
1497 *samples = av_clip_int16(sampledat);
1498 prev[ch][1] = prev[ch][0];
1499 prev[ch][0] = *samples++;
1501 /* In case of stereo, skip one sample, this sample
1502 is for the other channel. */
1508 /* In the previous loop, in case stereo is used, samples is
1509 increased exactly one time too often. */
1517 *data_size = (uint8_t *)samples - (uint8_t *)data;
1523 #ifdef CONFIG_ENCODERS
1524 #define ADPCM_ENCODER(id,name) \
1525 AVCodec name ## _encoder = { \
1529 sizeof(ADPCMContext), \
1530 adpcm_encode_init, \
1531 adpcm_encode_frame, \
1532 adpcm_encode_close, \
1536 #define ADPCM_ENCODER(id,name)
1539 #ifdef CONFIG_DECODERS
1540 #define ADPCM_DECODER(id,name) \
1541 AVCodec name ## _decoder = { \
1545 sizeof(ADPCMContext), \
1546 adpcm_decode_init, \
1549 adpcm_decode_frame, \
1552 #define ADPCM_DECODER(id,name)
1555 #define ADPCM_CODEC(id, name) \
1556 ADPCM_ENCODER(id,name) ADPCM_DECODER(id,name)
1558 ADPCM_DECODER(CODEC_ID_ADPCM_4XM, adpcm_4xm);
1559 ADPCM_DECODER(CODEC_ID_ADPCM_CT, adpcm_ct);
1560 ADPCM_DECODER(CODEC_ID_ADPCM_EA, adpcm_ea);
1561 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R1, adpcm_ea_r1);
1562 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R2, adpcm_ea_r2);
1563 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R3, adpcm_ea_r3);
1564 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_AMV, adpcm_ima_amv);
1565 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
1566 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
1567 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_EACS, adpcm_ima_ea_eacs);
1568 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead);
1569 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
1570 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg);
1571 ADPCM_CODEC (CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
1572 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws);
1573 ADPCM_CODEC (CODEC_ID_ADPCM_MS, adpcm_ms);
1574 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4);
1575 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3);
1576 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2);
1577 ADPCM_CODEC (CODEC_ID_ADPCM_SWF, adpcm_swf);
1578 ADPCM_DECODER(CODEC_ID_ADPCM_THP, adpcm_thp);
1579 ADPCM_DECODER(CODEC_ID_ADPCM_XA, adpcm_xa);
1580 ADPCM_CODEC (CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha);