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"
27 * First version by Francois Revol (revol@free.fr)
28 * Fringe ADPCM codecs (e.g., DK3, DK4, Westwood)
29 * by Mike Melanson (melanson@pcisys.net)
30 * CD-ROM XA ADPCM codec by BERO
31 * EA ADPCM decoder by Robin Kay (komadori@myrealbox.com)
33 * Features and limitations:
35 * Reference documents:
36 * http://www.pcisys.net/~melanson/codecs/simpleaudio.html
37 * http://www.geocities.com/SiliconValley/8682/aud3.txt
38 * http://openquicktime.sourceforge.net/plugins.htm
39 * XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html
40 * http://www.cs.ucla.edu/~leec/mediabench/applications.html
41 * SoX source code http://home.sprynet.com/~cbagwell/sox.html
44 * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html
45 * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html
46 * readstr http://www.geocities.co.jp/Playtown/2004/
51 #define CLAMP_TO_SHORT(value) \
54 else if (value < -32768) \
57 /* step_table[] and index_table[] are from the ADPCM reference source */
58 /* This is the index table: */
59 static const int index_table[16] = {
60 -1, -1, -1, -1, 2, 4, 6, 8,
61 -1, -1, -1, -1, 2, 4, 6, 8,
65 * This is the step table. Note that many programs use slight deviations from
66 * this table, but such deviations are negligible:
68 static const int step_table[89] = {
69 7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
70 19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
71 50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
72 130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
73 337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
74 876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
75 2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
76 5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
77 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
80 /* These are for MS-ADPCM */
81 /* AdaptationTable[], AdaptCoeff1[], and AdaptCoeff2[] are from libsndfile */
82 static const int AdaptationTable[] = {
83 230, 230, 230, 230, 307, 409, 512, 614,
84 768, 614, 512, 409, 307, 230, 230, 230
87 static const int AdaptCoeff1[] = {
88 256, 512, 0, 192, 240, 460, 392
91 static const int AdaptCoeff2[] = {
92 0, -256, 0, 64, 0, -208, -232
95 /* These are for CD-ROM XA ADPCM */
96 static const int xa_adpcm_table[5][2] = {
104 static const int ea_adpcm_table[] = {
105 0, 240, 460, 392, 0, 0, -208, -220, 0, 1,
106 3, 4, 7, 8, 10, 11, 0, -1, -3, -4
109 static const int ct_adpcm_table[8] = {
110 0x00E6, 0x00E6, 0x00E6, 0x00E6,
111 0x0133, 0x0199, 0x0200, 0x0266
114 // padded to zero where table size is less then 16
115 static const int swf_index_tables[4][16] = {
117 /*3*/ { -1, -1, 2, 4 },
118 /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },
119 /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }
122 static const int yamaha_indexscale[] = {
123 230, 230, 230, 230, 307, 409, 512, 614,
124 230, 230, 230, 230, 307, 409, 512, 614
127 static const int yamaha_difflookup[] = {
128 1, 3, 5, 7, 9, 11, 13, 15,
129 -1, -3, -5, -7, -9, -11, -13, -15
134 typedef struct ADPCMChannelStatus {
136 short int step_index;
147 } ADPCMChannelStatus;
149 typedef struct ADPCMContext {
150 int channel; /* for stereo MOVs, decode left, then decode right, then tell it's decoded */
151 ADPCMChannelStatus status[2];
152 short sample_buffer[32]; /* hold left samples while waiting for right samples */
159 /* XXX: implement encoding */
161 #ifdef CONFIG_ENCODERS
162 static int adpcm_encode_init(AVCodecContext *avctx)
164 if (avctx->channels > 2)
165 return -1; /* only stereo or mono =) */
166 switch(avctx->codec->id) {
167 case CODEC_ID_ADPCM_IMA_QT:
168 av_log(avctx, AV_LOG_ERROR, "ADPCM: codec adpcm_ima_qt unsupported for encoding !\n");
169 avctx->frame_size = 64; /* XXX: can multiple of avctx->channels * 64 (left and right blocks are interleaved) */
172 case CODEC_ID_ADPCM_IMA_WAV:
173 avctx->frame_size = (BLKSIZE - 4 * avctx->channels) * 8 / (4 * avctx->channels) + 1; /* each 16 bits sample gives one nibble */
174 /* and we have 4 bytes per channel overhead */
175 avctx->block_align = BLKSIZE;
176 /* seems frame_size isn't taken into account... have to buffer the samples :-( */
178 case CODEC_ID_ADPCM_MS:
179 avctx->frame_size = (BLKSIZE - 7 * avctx->channels) * 2 / avctx->channels + 2; /* each 16 bits sample gives one nibble */
180 /* and we have 7 bytes per channel overhead */
181 avctx->block_align = BLKSIZE;
183 case CODEC_ID_ADPCM_YAMAHA:
184 avctx->frame_size = BLKSIZE * avctx->channels;
185 avctx->block_align = BLKSIZE;
192 avctx->coded_frame= avcodec_alloc_frame();
193 avctx->coded_frame->key_frame= 1;
198 static int adpcm_encode_close(AVCodecContext *avctx)
200 av_freep(&avctx->coded_frame);
206 static inline unsigned char adpcm_ima_compress_sample(ADPCMChannelStatus *c, short sample)
208 int delta = sample - c->prev_sample;
209 int nibble = FFMIN(7, abs(delta)*4/step_table[c->step_index]) + (delta<0)*8;
210 c->prev_sample = c->prev_sample + ((step_table[c->step_index] * yamaha_difflookup[nibble]) / 8);
211 CLAMP_TO_SHORT(c->prev_sample);
212 c->step_index = clip(c->step_index + index_table[nibble], 0, 88);
216 static inline unsigned char adpcm_ms_compress_sample(ADPCMChannelStatus *c, short sample)
218 int predictor, nibble, bias;
220 predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
222 nibble= sample - predictor;
223 if(nibble>=0) bias= c->idelta/2;
224 else bias=-c->idelta/2;
226 nibble= (nibble + bias) / c->idelta;
227 nibble= clip(nibble, -8, 7)&0x0F;
229 predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
230 CLAMP_TO_SHORT(predictor);
232 c->sample2 = c->sample1;
233 c->sample1 = predictor;
235 c->idelta = (AdaptationTable[(int)nibble] * c->idelta) >> 8;
236 if (c->idelta < 16) c->idelta = 16;
241 static inline unsigned char adpcm_yamaha_compress_sample(ADPCMChannelStatus *c, short sample)
250 delta = sample - c->predictor;
252 nibble = FFMIN(7, abs(delta)*4/c->step) + (delta<0)*8;
254 c->predictor = c->predictor + ((c->step * yamaha_difflookup[nibble]) / 8);
255 CLAMP_TO_SHORT(c->predictor);
256 c->step = (c->step * yamaha_indexscale[nibble]) >> 8;
257 c->step = clip(c->step, 127, 24567);
262 typedef struct TrellisPath {
267 typedef struct TrellisNode {
275 static void adpcm_compress_trellis(AVCodecContext *avctx, const short *samples,
276 uint8_t *dst, ADPCMChannelStatus *c, int n)
278 #define FREEZE_INTERVAL 128
279 //FIXME 6% faster if frontier is a compile-time constant
280 const int frontier = 1 << avctx->trellis;
281 const int stride = avctx->channels;
282 const int version = avctx->codec->id;
283 const int max_paths = frontier*FREEZE_INTERVAL;
284 TrellisPath paths[max_paths], *p;
285 TrellisNode node_buf[2][frontier];
286 TrellisNode *nodep_buf[2][frontier];
287 TrellisNode **nodes = nodep_buf[0]; // nodes[] is always sorted by .ssd
288 TrellisNode **nodes_next = nodep_buf[1];
289 int pathn = 0, froze = -1, i, j, k;
291 assert(!(max_paths&(max_paths-1)));
293 memset(nodep_buf, 0, sizeof(nodep_buf));
294 nodes[0] = &node_buf[1][0];
297 nodes[0]->step = c->step_index;
298 nodes[0]->sample1 = c->sample1;
299 nodes[0]->sample2 = c->sample2;
300 if(version == CODEC_ID_ADPCM_IMA_WAV)
301 nodes[0]->sample1 = c->prev_sample;
302 if(version == CODEC_ID_ADPCM_MS)
303 nodes[0]->step = c->idelta;
304 if(version == CODEC_ID_ADPCM_YAMAHA) {
306 nodes[0]->step = 127;
307 nodes[0]->sample1 = 0;
309 nodes[0]->step = c->step;
310 nodes[0]->sample1 = c->predictor;
315 TrellisNode *t = node_buf[i&1];
317 int sample = samples[i*stride];
318 memset(nodes_next, 0, frontier*sizeof(TrellisNode*));
319 for(j=0; j<frontier && nodes[j]; j++) {
320 // higher j have higher ssd already, so they're unlikely to use a suboptimal next sample too
321 const int range = (j < frontier/2) ? 1 : 0;
322 const int step = nodes[j]->step;
324 if(version == CODEC_ID_ADPCM_MS) {
325 const int predictor = ((nodes[j]->sample1 * c->coeff1) + (nodes[j]->sample2 * c->coeff2)) / 256;
326 const int div = (sample - predictor) / step;
327 const int nmin = clip(div-range, -8, 6);
328 const int nmax = clip(div+range, -7, 7);
329 for(nidx=nmin; nidx<=nmax; nidx++) {
330 const int nibble = nidx & 0xf;
331 int dec_sample = predictor + nidx * step;
332 #define STORE_NODE(NAME, STEP_INDEX)\
335 CLAMP_TO_SHORT(dec_sample);\
336 d = sample - dec_sample;\
337 ssd = nodes[j]->ssd + d*d;\
338 if(nodes_next[frontier-1] && ssd >= nodes_next[frontier-1]->ssd)\
340 /* Collapse any two states with the same previous sample value. \
341 * One could also distinguish states by step and by 2nd to last
342 * sample, but the effects of that are negligible. */\
343 for(k=0; k<frontier && nodes_next[k]; k++) {\
344 if(dec_sample == nodes_next[k]->sample1) {\
345 assert(ssd >= nodes_next[k]->ssd);\
349 for(k=0; k<frontier; k++) {\
350 if(!nodes_next[k] || ssd < nodes_next[k]->ssd) {\
351 TrellisNode *u = nodes_next[frontier-1];\
353 assert(pathn < max_paths);\
358 u->step = STEP_INDEX;\
359 u->sample2 = nodes[j]->sample1;\
360 u->sample1 = dec_sample;\
361 paths[u->path].nibble = nibble;\
362 paths[u->path].prev = nodes[j]->path;\
363 memmove(&nodes_next[k+1], &nodes_next[k], (frontier-k-1)*sizeof(TrellisNode*));\
369 STORE_NODE(ms, FFMAX(16, (AdaptationTable[nibble] * step) >> 8));
371 } else if(version == CODEC_ID_ADPCM_IMA_WAV) {
372 #define LOOP_NODES(NAME, STEP_TABLE, STEP_INDEX)\
373 const int predictor = nodes[j]->sample1;\
374 const int div = (sample - predictor) * 4 / STEP_TABLE;\
375 int nmin = clip(div-range, -7, 6);\
376 int nmax = clip(div+range, -6, 7);\
377 if(nmin<=0) nmin--; /* distinguish -0 from +0 */\
379 for(nidx=nmin; nidx<=nmax; nidx++) {\
380 const int nibble = nidx<0 ? 7-nidx : nidx;\
381 int dec_sample = predictor + (STEP_TABLE * yamaha_difflookup[nibble]) / 8;\
382 STORE_NODE(NAME, STEP_INDEX);\
384 LOOP_NODES(ima, step_table[step], clip(step + index_table[nibble], 0, 88));
385 } else { //CODEC_ID_ADPCM_YAMAHA
386 LOOP_NODES(yamaha, step, clip((step * yamaha_indexscale[nibble]) >> 8, 127, 24567));
397 if(nodes[0]->ssd > (1<<28)) {
398 for(j=1; j<frontier && nodes[j]; j++)
399 nodes[j]->ssd -= nodes[0]->ssd;
403 // merge old paths to save memory
404 if(i == froze + FREEZE_INTERVAL) {
405 p = &paths[nodes[0]->path];
406 for(k=i; k>froze; k--) {
412 // other nodes might use paths that don't coincide with the frozen one.
413 // checking which nodes do so is too slow, so just kill them all.
414 // this also slightly improves quality, but I don't know why.
415 memset(nodes+1, 0, (frontier-1)*sizeof(TrellisNode*));
419 p = &paths[nodes[0]->path];
420 for(i=n-1; i>froze; i--) {
425 c->predictor = nodes[0]->sample1;
426 c->sample1 = nodes[0]->sample1;
427 c->sample2 = nodes[0]->sample2;
428 c->step_index = nodes[0]->step;
429 c->step = nodes[0]->step;
430 c->idelta = nodes[0]->step;
433 static int adpcm_encode_frame(AVCodecContext *avctx,
434 unsigned char *frame, int buf_size, void *data)
439 ADPCMContext *c = avctx->priv_data;
442 samples = (short *)data;
443 st= avctx->channels == 2;
444 /* n = (BLKSIZE - 4 * avctx->channels) / (2 * 8 * avctx->channels); */
446 switch(avctx->codec->id) {
447 case CODEC_ID_ADPCM_IMA_QT: /* XXX: can't test until we get .mov writer */
449 case CODEC_ID_ADPCM_IMA_WAV:
450 n = avctx->frame_size / 8;
451 c->status[0].prev_sample = (signed short)samples[0]; /* XXX */
452 /* c->status[0].step_index = 0; *//* XXX: not sure how to init the state machine */
453 *dst++ = (c->status[0].prev_sample) & 0xFF; /* little endian */
454 *dst++ = (c->status[0].prev_sample >> 8) & 0xFF;
455 *dst++ = (unsigned char)c->status[0].step_index;
456 *dst++ = 0; /* unknown */
458 if (avctx->channels == 2) {
459 c->status[1].prev_sample = (signed short)samples[1];
460 /* c->status[1].step_index = 0; */
461 *dst++ = (c->status[1].prev_sample) & 0xFF;
462 *dst++ = (c->status[1].prev_sample >> 8) & 0xFF;
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]) & 0x0F;
489 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels]) << 4) & 0xF0;
491 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 2]) & 0x0F;
492 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 3]) << 4) & 0xF0;
494 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 4]) & 0x0F;
495 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 5]) << 4) & 0xF0;
497 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 6]) & 0x0F;
498 *dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 7]) << 4) & 0xF0;
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_MS:
519 for(i=0; i<avctx->channels; i++){
523 c->status[i].coeff1 = AdaptCoeff1[predictor];
524 c->status[i].coeff2 = AdaptCoeff2[predictor];
526 for(i=0; i<avctx->channels; i++){
527 if (c->status[i].idelta < 16)
528 c->status[i].idelta = 16;
530 *dst++ = c->status[i].idelta & 0xFF;
531 *dst++ = c->status[i].idelta >> 8;
533 for(i=0; i<avctx->channels; i++){
534 c->status[i].sample1= *samples++;
536 *dst++ = c->status[i].sample1 & 0xFF;
537 *dst++ = c->status[i].sample1 >> 8;
539 for(i=0; i<avctx->channels; i++){
540 c->status[i].sample2= *samples++;
542 *dst++ = c->status[i].sample2 & 0xFF;
543 *dst++ = c->status[i].sample2 >> 8;
546 if(avctx->trellis > 0) {
547 int n = avctx->block_align - 7*avctx->channels;
549 if(avctx->channels == 1) {
551 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);
553 *dst++ = (buf[0][i] << 4) | buf[0][i+1];
555 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);
556 adpcm_compress_trellis(avctx, samples+1, buf[1], &c->status[1], n);
558 *dst++ = (buf[0][i] << 4) | buf[1][i];
561 for(i=7*avctx->channels; i<avctx->block_align; i++) {
563 nibble = adpcm_ms_compress_sample(&c->status[ 0], *samples++)<<4;
564 nibble|= adpcm_ms_compress_sample(&c->status[st], *samples++);
568 case CODEC_ID_ADPCM_YAMAHA:
569 n = avctx->frame_size / 2;
570 if(avctx->trellis > 0) {
573 if(avctx->channels == 1) {
574 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);
576 *dst++ = buf[0][i] | (buf[0][i+1] << 4);
578 adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);
579 adpcm_compress_trellis(avctx, samples+1, buf[1], &c->status[1], n);
581 *dst++ = buf[0][i] | (buf[1][i] << 4);
585 for(i = 0; i < avctx->channels; i++) {
587 nibble = adpcm_yamaha_compress_sample(&c->status[i], samples[i]);
588 nibble |= adpcm_yamaha_compress_sample(&c->status[i], samples[i+avctx->channels]) << 4;
591 samples += 2 * avctx->channels;
599 #endif //CONFIG_ENCODERS
601 static int adpcm_decode_init(AVCodecContext * avctx)
603 ADPCMContext *c = avctx->priv_data;
606 c->status[0].predictor = c->status[1].predictor = 0;
607 c->status[0].step_index = c->status[1].step_index = 0;
608 c->status[0].step = c->status[1].step = 0;
610 switch(avctx->codec->id) {
611 case CODEC_ID_ADPCM_CT:
612 c->status[0].step = c->status[1].step = 511;
620 static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)
624 int sign, delta, diff, step;
626 step = step_table[c->step_index];
627 step_index = c->step_index + index_table[(unsigned)nibble];
628 if (step_index < 0) step_index = 0;
629 else if (step_index > 88) step_index = 88;
633 /* perform direct multiplication instead of series of jumps proposed by
634 * the reference ADPCM implementation since modern CPUs can do the mults
636 diff = ((2 * delta + 1) * step) >> shift;
637 predictor = c->predictor;
638 if (sign) predictor -= diff;
639 else predictor += diff;
641 CLAMP_TO_SHORT(predictor);
642 c->predictor = predictor;
643 c->step_index = step_index;
645 return (short)predictor;
648 static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
652 predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
653 predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
654 CLAMP_TO_SHORT(predictor);
656 c->sample2 = c->sample1;
657 c->sample1 = predictor;
658 c->idelta = (AdaptationTable[(int)nibble] * c->idelta) >> 8;
659 if (c->idelta < 16) c->idelta = 16;
661 return (short)predictor;
664 static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)
667 int sign, delta, diff;
672 /* perform direct multiplication instead of series of jumps proposed by
673 * the reference ADPCM implementation since modern CPUs can do the mults
675 diff = ((2 * delta + 1) * c->step) >> 3;
676 predictor = c->predictor;
677 /* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */
679 predictor = ((predictor * 254) >> 8) - diff;
681 predictor = ((predictor * 254) >> 8) + diff;
682 /* calculate new step and clamp it to range 511..32767 */
683 new_step = (ct_adpcm_table[nibble & 7] * c->step) >> 8;
690 CLAMP_TO_SHORT(predictor);
691 c->predictor = predictor;
692 return (short)predictor;
695 static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)
697 int sign, delta, diff;
699 sign = nibble & (1<<(size-1));
700 delta = nibble & ((1<<(size-1))-1);
701 diff = delta << (7 + c->step + shift);
704 c->predictor -= diff;
706 c->predictor += diff;
709 if (c->predictor > 16256)
710 c->predictor = 16256;
711 else if (c->predictor < -16384)
712 c->predictor = -16384;
714 /* calculate new step */
715 if (delta >= (2*size - 3) && c->step < 3)
717 else if (delta == 0 && c->step > 0)
720 return (short) c->predictor;
723 static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)
730 c->predictor += (c->step * yamaha_difflookup[nibble]) / 8;
731 CLAMP_TO_SHORT(c->predictor);
732 c->step = (c->step * yamaha_indexscale[nibble]) >> 8;
733 c->step = clip(c->step, 127, 24567);
737 static void xa_decode(short *out, const unsigned char *in,
738 ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)
741 int shift,filter,f0,f1;
747 shift = 12 - (in[4+i*2] & 15);
748 filter = in[4+i*2] >> 4;
749 f0 = xa_adpcm_table[filter][0];
750 f1 = xa_adpcm_table[filter][1];
758 t = (signed char)(d<<4)>>4;
759 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
767 if (inc==2) { /* stereo */
770 s_1 = right->sample1;
771 s_2 = right->sample2;
772 out = out + 1 - 28*2;
775 shift = 12 - (in[5+i*2] & 15);
776 filter = in[5+i*2] >> 4;
778 f0 = xa_adpcm_table[filter][0];
779 f1 = xa_adpcm_table[filter][1];
784 t = (signed char)d >> 4;
785 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
793 if (inc==2) { /* stereo */
794 right->sample1 = s_1;
795 right->sample2 = s_2;
805 /* DK3 ADPCM support macro */
806 #define DK3_GET_NEXT_NIBBLE() \
807 if (decode_top_nibble_next) \
809 nibble = (last_byte >> 4) & 0x0F; \
810 decode_top_nibble_next = 0; \
814 last_byte = *src++; \
815 if (src >= buf + buf_size) break; \
816 nibble = last_byte & 0x0F; \
817 decode_top_nibble_next = 1; \
820 static int adpcm_decode_frame(AVCodecContext *avctx,
821 void *data, int *data_size,
822 uint8_t *buf, int buf_size)
824 ADPCMContext *c = avctx->priv_data;
825 ADPCMChannelStatus *cs;
826 int n, m, channel, i;
827 int block_predictor[2];
832 /* DK3 ADPCM accounting variables */
833 unsigned char last_byte = 0;
834 unsigned char nibble;
835 int decode_top_nibble_next = 0;
838 /* EA ADPCM state variables */
839 uint32_t samples_in_chunk;
840 int32_t previous_left_sample, previous_right_sample;
841 int32_t current_left_sample, current_right_sample;
842 int32_t next_left_sample, next_right_sample;
843 int32_t coeff1l, coeff2l, coeff1r, coeff2r;
844 uint8_t shift_left, shift_right;
853 st = avctx->channels == 2 ? 1 : 0;
855 switch(avctx->codec->id) {
856 case CODEC_ID_ADPCM_IMA_QT:
857 n = (buf_size - 2);/* >> 2*avctx->channels;*/
858 channel = c->channel;
859 cs = &(c->status[channel]);
860 /* (pppppp) (piiiiiii) */
862 /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
863 cs->predictor = (*src++) << 8;
864 cs->predictor |= (*src & 0x80);
865 cs->predictor &= 0xFF80;
868 if(cs->predictor & 0x8000)
869 cs->predictor -= 0x10000;
871 CLAMP_TO_SHORT(cs->predictor);
873 cs->step_index = (*src++) & 0x7F;
875 if (cs->step_index > 88){
876 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
880 cs->step = step_table[cs->step_index];
885 for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */
886 *samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F, 3);
887 samples += avctx->channels;
888 *samples = adpcm_ima_expand_nibble(cs, (src[0] >> 4) & 0x0F, 3);
889 samples += avctx->channels;
893 if(st) { /* handle stereo interlacing */
894 c->channel = (channel + 1) % 2; /* we get one packet for left, then one for right data */
895 if(channel == 1) { /* wait for the other packet before outputing anything */
900 case CODEC_ID_ADPCM_IMA_WAV:
901 if (avctx->block_align != 0 && buf_size > avctx->block_align)
902 buf_size = avctx->block_align;
904 // samples_per_block= (block_align-4*chanels)*8 / (bits_per_sample * chanels) + 1;
906 for(i=0; i<avctx->channels; i++){
907 cs = &(c->status[i]);
908 cs->predictor = (int16_t)(src[0] + (src[1]<<8));
911 // XXX: is this correct ??: *samples++ = cs->predictor;
913 cs->step_index = *src++;
914 if (cs->step_index > 88){
915 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
918 if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null but is %d!!\n", src[-1]); /* unused */
921 while(src < buf + buf_size){
924 *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] & 0x0F, 3);
926 *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] >> 4 , 3);
932 case CODEC_ID_ADPCM_4XM:
933 cs = &(c->status[0]);
934 c->status[0].predictor= (int16_t)(src[0] + (src[1]<<8)); src+=2;
936 c->status[1].predictor= (int16_t)(src[0] + (src[1]<<8)); src+=2;
938 c->status[0].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;
940 c->status[1].step_index= (int16_t)(src[0] + (src[1]<<8)); src+=2;
942 if (cs->step_index < 0) cs->step_index = 0;
943 if (cs->step_index > 88) cs->step_index = 88;
945 m= (buf_size - (src - buf))>>st;
947 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] & 0x0F, 4);
949 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] & 0x0F, 4);
950 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] >> 4, 4);
952 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] >> 4, 4);
958 case CODEC_ID_ADPCM_MS:
959 if (avctx->block_align != 0 && buf_size > avctx->block_align)
960 buf_size = avctx->block_align;
961 n = buf_size - 7 * avctx->channels;
964 block_predictor[0] = clip(*src++, 0, 7);
965 block_predictor[1] = 0;
967 block_predictor[1] = clip(*src++, 0, 7);
968 c->status[0].idelta = (int16_t)((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
971 c->status[1].idelta = (int16_t)((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
974 c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];
975 c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];
976 c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];
977 c->status[1].coeff2 = AdaptCoeff2[block_predictor[1]];
979 c->status[0].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
981 if (st) c->status[1].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
983 c->status[0].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
985 if (st) c->status[1].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
988 *samples++ = c->status[0].sample1;
989 if (st) *samples++ = c->status[1].sample1;
990 *samples++ = c->status[0].sample2;
991 if (st) *samples++ = c->status[1].sample2;
993 *samples++ = adpcm_ms_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);
994 *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
998 case CODEC_ID_ADPCM_IMA_DK4:
999 if (avctx->block_align != 0 && buf_size > avctx->block_align)
1000 buf_size = avctx->block_align;
1002 c->status[0].predictor = (int16_t)(src[0] | (src[1] << 8));
1003 c->status[0].step_index = src[2];
1005 *samples++ = c->status[0].predictor;
1007 c->status[1].predictor = (int16_t)(src[0] | (src[1] << 8));
1008 c->status[1].step_index = src[2];
1010 *samples++ = c->status[1].predictor;
1012 while (src < buf + buf_size) {
1014 /* take care of the top nibble (always left or mono channel) */
1015 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1016 (src[0] >> 4) & 0x0F, 3);
1018 /* take care of the bottom nibble, which is right sample for
1019 * stereo, or another mono sample */
1021 *samples++ = adpcm_ima_expand_nibble(&c->status[1],
1024 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1030 case CODEC_ID_ADPCM_IMA_DK3:
1031 if (avctx->block_align != 0 && buf_size > avctx->block_align)
1032 buf_size = avctx->block_align;
1034 c->status[0].predictor = (int16_t)(src[10] | (src[11] << 8));
1035 c->status[1].predictor = (int16_t)(src[12] | (src[13] << 8));
1036 c->status[0].step_index = src[14];
1037 c->status[1].step_index = src[15];
1038 /* sign extend the predictors */
1040 diff_channel = c->status[1].predictor;
1042 /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when
1043 * the buffer is consumed */
1046 /* for this algorithm, c->status[0] is the sum channel and
1047 * c->status[1] is the diff channel */
1049 /* process the first predictor of the sum channel */
1050 DK3_GET_NEXT_NIBBLE();
1051 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
1053 /* process the diff channel predictor */
1054 DK3_GET_NEXT_NIBBLE();
1055 adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
1057 /* process the first pair of stereo PCM samples */
1058 diff_channel = (diff_channel + c->status[1].predictor) / 2;
1059 *samples++ = c->status[0].predictor + c->status[1].predictor;
1060 *samples++ = c->status[0].predictor - c->status[1].predictor;
1062 /* process the second predictor of the sum channel */
1063 DK3_GET_NEXT_NIBBLE();
1064 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
1066 /* process the second pair of stereo PCM samples */
1067 diff_channel = (diff_channel + c->status[1].predictor) / 2;
1068 *samples++ = c->status[0].predictor + c->status[1].predictor;
1069 *samples++ = c->status[0].predictor - c->status[1].predictor;
1072 case CODEC_ID_ADPCM_IMA_WS:
1073 /* no per-block initialization; just start decoding the data */
1074 while (src < buf + buf_size) {
1077 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1078 (src[0] >> 4) & 0x0F, 3);
1079 *samples++ = adpcm_ima_expand_nibble(&c->status[1],
1082 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1083 (src[0] >> 4) & 0x0F, 3);
1084 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1091 case CODEC_ID_ADPCM_XA:
1092 c->status[0].sample1 = c->status[0].sample2 =
1093 c->status[1].sample1 = c->status[1].sample2 = 0;
1094 while (buf_size >= 128) {
1095 xa_decode(samples, src, &c->status[0], &c->status[1],
1102 case CODEC_ID_ADPCM_EA:
1103 samples_in_chunk = AV_RL32(src);
1104 if (samples_in_chunk >= ((buf_size - 12) * 2)) {
1109 current_left_sample = (int16_t)AV_RL16(src);
1111 previous_left_sample = (int16_t)AV_RL16(src);
1113 current_right_sample = (int16_t)AV_RL16(src);
1115 previous_right_sample = (int16_t)AV_RL16(src);
1118 for (count1 = 0; count1 < samples_in_chunk/28;count1++) {
1119 coeff1l = ea_adpcm_table[(*src >> 4) & 0x0F];
1120 coeff2l = ea_adpcm_table[((*src >> 4) & 0x0F) + 4];
1121 coeff1r = ea_adpcm_table[*src & 0x0F];
1122 coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];
1125 shift_left = ((*src >> 4) & 0x0F) + 8;
1126 shift_right = (*src & 0x0F) + 8;
1129 for (count2 = 0; count2 < 28; count2++) {
1130 next_left_sample = (((*src & 0xF0) << 24) >> shift_left);
1131 next_right_sample = (((*src & 0x0F) << 28) >> shift_right);
1134 next_left_sample = (next_left_sample +
1135 (current_left_sample * coeff1l) +
1136 (previous_left_sample * coeff2l) + 0x80) >> 8;
1137 next_right_sample = (next_right_sample +
1138 (current_right_sample * coeff1r) +
1139 (previous_right_sample * coeff2r) + 0x80) >> 8;
1140 CLAMP_TO_SHORT(next_left_sample);
1141 CLAMP_TO_SHORT(next_right_sample);
1143 previous_left_sample = current_left_sample;
1144 current_left_sample = next_left_sample;
1145 previous_right_sample = current_right_sample;
1146 current_right_sample = next_right_sample;
1147 *samples++ = (unsigned short)current_left_sample;
1148 *samples++ = (unsigned short)current_right_sample;
1152 case CODEC_ID_ADPCM_IMA_SMJPEG:
1153 c->status[0].predictor = *src;
1155 c->status[0].step_index = *src++;
1156 src++; /* skip another byte before getting to the meat */
1157 while (src < buf + buf_size) {
1158 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1160 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1161 (*src >> 4) & 0x0F, 3);
1165 case CODEC_ID_ADPCM_CT:
1166 while (src < buf + buf_size) {
1168 *samples++ = adpcm_ct_expand_nibble(&c->status[0],
1169 (src[0] >> 4) & 0x0F);
1170 *samples++ = adpcm_ct_expand_nibble(&c->status[1],
1173 *samples++ = adpcm_ct_expand_nibble(&c->status[0],
1174 (src[0] >> 4) & 0x0F);
1175 *samples++ = adpcm_ct_expand_nibble(&c->status[0],
1181 case CODEC_ID_ADPCM_SBPRO_4:
1182 case CODEC_ID_ADPCM_SBPRO_3:
1183 case CODEC_ID_ADPCM_SBPRO_2:
1184 if (!c->status[0].step_index) {
1185 /* the first byte is a raw sample */
1186 *samples++ = 128 * (*src++ - 0x80);
1188 *samples++ = 128 * (*src++ - 0x80);
1189 c->status[0].step_index = 1;
1191 if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {
1192 while (src < buf + buf_size) {
1193 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1194 (src[0] >> 4) & 0x0F, 4, 0);
1195 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1196 src[0] & 0x0F, 4, 0);
1199 } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {
1200 while (src < buf + buf_size) {
1201 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1202 (src[0] >> 5) & 0x07, 3, 0);
1203 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1204 (src[0] >> 2) & 0x07, 3, 0);
1205 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1206 src[0] & 0x03, 2, 0);
1210 while (src < buf + buf_size) {
1211 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1212 (src[0] >> 6) & 0x03, 2, 2);
1213 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1214 (src[0] >> 4) & 0x03, 2, 2);
1215 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1216 (src[0] >> 2) & 0x03, 2, 2);
1217 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1218 src[0] & 0x03, 2, 2);
1223 case CODEC_ID_ADPCM_SWF:
1228 int size = buf_size*8;
1230 init_get_bits(&gb, buf, size);
1232 // first frame, read bits & inital values
1235 c->nb_bits = get_bits(&gb, 2)+2;
1236 // av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", c->nb_bits);
1239 table = swf_index_tables[c->nb_bits-2];
1240 k0 = 1 << (c->nb_bits-2);
1241 signmask = 1 << (c->nb_bits-1);
1243 while (get_bits_count(&gb) <= size)
1248 // wrap around at every 4096 samples...
1249 if ((c->nb_samples & 0xfff) == 1)
1251 for (i = 0; i <= st; i++)
1253 *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
1254 c->status[i].step_index = get_bits(&gb, 6);
1258 // similar to IMA adpcm
1259 for (i = 0; i <= st; i++)
1261 int delta = get_bits(&gb, c->nb_bits);
1262 int step = step_table[c->status[i].step_index];
1263 long vpdiff = 0; // vpdiff = (delta+0.5)*step/4
1274 if (delta & signmask)
1275 c->status[i].predictor -= vpdiff;
1277 c->status[i].predictor += vpdiff;
1279 c->status[i].step_index += table[delta & (~signmask)];
1281 c->status[i].step_index = clip(c->status[i].step_index, 0, 88);
1282 c->status[i].predictor = clip(c->status[i].predictor, -32768, 32767);
1284 *samples++ = c->status[i].predictor;
1288 // src += get_bits_count(&gb)*8;
1293 case CODEC_ID_ADPCM_YAMAHA:
1294 while (src < buf + buf_size) {
1296 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
1298 *samples++ = adpcm_yamaha_expand_nibble(&c->status[1],
1299 (src[0] >> 4) & 0x0F);
1301 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
1303 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
1304 (src[0] >> 4) & 0x0F);
1312 *data_size = (uint8_t *)samples - (uint8_t *)data;
1318 #ifdef CONFIG_ENCODERS
1319 #define ADPCM_ENCODER(id,name) \
1320 AVCodec name ## _encoder = { \
1324 sizeof(ADPCMContext), \
1325 adpcm_encode_init, \
1326 adpcm_encode_frame, \
1327 adpcm_encode_close, \
1331 #define ADPCM_ENCODER(id,name)
1334 #ifdef CONFIG_DECODERS
1335 #define ADPCM_DECODER(id,name) \
1336 AVCodec name ## _decoder = { \
1340 sizeof(ADPCMContext), \
1341 adpcm_decode_init, \
1344 adpcm_decode_frame, \
1347 #define ADPCM_DECODER(id,name)
1350 #define ADPCM_CODEC(id, name) \
1351 ADPCM_ENCODER(id,name) ADPCM_DECODER(id,name)
1353 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
1354 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
1355 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
1356 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
1357 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws);
1358 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg);
1359 ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
1360 ADPCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);
1361 ADPCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa);
1362 ADPCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_ea);
1363 ADPCM_CODEC(CODEC_ID_ADPCM_CT, adpcm_ct);
1364 ADPCM_CODEC(CODEC_ID_ADPCM_SWF, adpcm_swf);
1365 ADPCM_CODEC(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha);
1366 ADPCM_CODEC(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4);
1367 ADPCM_CODEC(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3);
1368 ADPCM_CODEC(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2);