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4 * This file is part of FFmpeg.
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7 * modify it under the terms of the GNU Lesser General Public
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "bytestream.h"
26 #include "adpcm_data.h"
31 * First version by Francois Revol (revol@free.fr)
32 * Fringe ADPCM codecs (e.g., DK3, DK4, Westwood)
33 * by Mike Melanson (melanson@pcisys.net)
35 * See ADPCM decoder reference documents for codec information.
38 typedef struct TrellisPath {
43 typedef struct TrellisNode {
51 typedef struct ADPCMEncodeContext {
52 ADPCMChannelStatus status[6];
54 TrellisNode *node_buf;
55 TrellisNode **nodep_buf;
56 uint8_t *trellis_hash;
59 #define FREEZE_INTERVAL 128
61 static av_cold int adpcm_encode_init(AVCodecContext *avctx)
63 ADPCMEncodeContext *s = avctx->priv_data;
66 if (avctx->channels > 2)
67 return -1; /* only stereo or mono =) */
69 if(avctx->trellis && (unsigned)avctx->trellis > 16U){
70 av_log(avctx, AV_LOG_ERROR, "invalid trellis size\n");
75 int frontier = 1 << avctx->trellis;
76 int max_paths = frontier * FREEZE_INTERVAL;
77 FF_ALLOC_OR_GOTO(avctx, s->paths, max_paths * sizeof(*s->paths), error);
78 FF_ALLOC_OR_GOTO(avctx, s->node_buf, 2 * frontier * sizeof(*s->node_buf), error);
79 FF_ALLOC_OR_GOTO(avctx, s->nodep_buf, 2 * frontier * sizeof(*s->nodep_buf), error);
80 FF_ALLOC_OR_GOTO(avctx, s->trellis_hash, 65536 * sizeof(*s->trellis_hash), error);
83 avctx->bits_per_coded_sample = av_get_bits_per_sample(avctx->codec->id);
85 switch(avctx->codec->id) {
86 case CODEC_ID_ADPCM_IMA_WAV:
87 avctx->frame_size = (BLKSIZE - 4 * avctx->channels) * 8 / (4 * avctx->channels) + 1; /* each 16 bits sample gives one nibble */
88 /* and we have 4 bytes per channel overhead */
89 avctx->block_align = BLKSIZE;
90 avctx->bits_per_coded_sample = 4;
91 /* seems frame_size isn't taken into account... have to buffer the samples :-( */
93 case CODEC_ID_ADPCM_IMA_QT:
94 avctx->frame_size = 64;
95 avctx->block_align = 34 * avctx->channels;
97 case CODEC_ID_ADPCM_MS:
98 avctx->frame_size = (BLKSIZE - 7 * avctx->channels) * 2 / avctx->channels + 2; /* each 16 bits sample gives one nibble */
99 /* and we have 7 bytes per channel overhead */
100 avctx->block_align = BLKSIZE;
101 avctx->bits_per_coded_sample = 4;
102 avctx->extradata_size = 32;
103 extradata = avctx->extradata = av_malloc(avctx->extradata_size);
105 return AVERROR(ENOMEM);
106 bytestream_put_le16(&extradata, avctx->frame_size);
107 bytestream_put_le16(&extradata, 7); /* wNumCoef */
108 for (i = 0; i < 7; i++) {
109 bytestream_put_le16(&extradata, ff_adpcm_AdaptCoeff1[i] * 4);
110 bytestream_put_le16(&extradata, ff_adpcm_AdaptCoeff2[i] * 4);
113 case CODEC_ID_ADPCM_YAMAHA:
114 avctx->frame_size = BLKSIZE * avctx->channels;
115 avctx->block_align = BLKSIZE;
117 case CODEC_ID_ADPCM_SWF:
118 if (avctx->sample_rate != 11025 &&
119 avctx->sample_rate != 22050 &&
120 avctx->sample_rate != 44100) {
121 av_log(avctx, AV_LOG_ERROR, "Sample rate must be 11025, 22050 or 44100\n");
124 avctx->frame_size = 512 * (avctx->sample_rate / 11025);
130 avctx->coded_frame= avcodec_alloc_frame();
131 avctx->coded_frame->key_frame= 1;
136 av_freep(&s->node_buf);
137 av_freep(&s->nodep_buf);
138 av_freep(&s->trellis_hash);
142 static av_cold int adpcm_encode_close(AVCodecContext *avctx)
144 ADPCMEncodeContext *s = avctx->priv_data;
145 av_freep(&avctx->coded_frame);
147 av_freep(&s->node_buf);
148 av_freep(&s->nodep_buf);
149 av_freep(&s->trellis_hash);
155 static inline unsigned char adpcm_ima_compress_sample(ADPCMChannelStatus *c, short sample)
157 int delta = sample - c->prev_sample;
158 int nibble = FFMIN(7, abs(delta)*4/ff_adpcm_step_table[c->step_index]) + (delta<0)*8;
159 c->prev_sample += ((ff_adpcm_step_table[c->step_index] * ff_adpcm_yamaha_difflookup[nibble]) / 8);
160 c->prev_sample = av_clip_int16(c->prev_sample);
161 c->step_index = av_clip(c->step_index + ff_adpcm_index_table[nibble], 0, 88);
165 static inline unsigned char adpcm_ima_qt_compress_sample(ADPCMChannelStatus *c, short sample)
167 int delta = sample - c->prev_sample;
168 int diff, step = ff_adpcm_step_table[c->step_index];
169 int nibble = 8*(delta < 0);
172 diff = delta + (step >> 3);
191 c->prev_sample -= diff;
193 c->prev_sample += diff;
195 c->prev_sample = av_clip_int16(c->prev_sample);
196 c->step_index = av_clip(c->step_index + ff_adpcm_index_table[nibble], 0, 88);
201 static inline unsigned char adpcm_ms_compress_sample(ADPCMChannelStatus *c, short sample)
203 int predictor, nibble, bias;
205 predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;
207 nibble= sample - predictor;
208 if(nibble>=0) bias= c->idelta/2;
209 else bias=-c->idelta/2;
211 nibble= (nibble + bias) / c->idelta;
212 nibble= av_clip(nibble, -8, 7)&0x0F;
214 predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
216 c->sample2 = c->sample1;
217 c->sample1 = av_clip_int16(predictor);
219 c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;
220 if (c->idelta < 16) c->idelta = 16;
225 static inline unsigned char adpcm_yamaha_compress_sample(ADPCMChannelStatus *c, short sample)
234 delta = sample - c->predictor;
236 nibble = FFMIN(7, abs(delta)*4/c->step) + (delta<0)*8;
238 c->predictor += ((c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8);
239 c->predictor = av_clip_int16(c->predictor);
240 c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;
241 c->step = av_clip(c->step, 127, 24567);
246 static void adpcm_compress_trellis(AVCodecContext *avctx, const short *samples,
247 uint8_t *dst, ADPCMChannelStatus *c, int n)
249 //FIXME 6% faster if frontier is a compile-time constant
250 ADPCMEncodeContext *s = avctx->priv_data;
251 const int frontier = 1 << avctx->trellis;
252 const int stride = avctx->channels;
253 const int version = avctx->codec->id;
254 TrellisPath *paths = s->paths, *p;
255 TrellisNode *node_buf = s->node_buf;
256 TrellisNode **nodep_buf = s->nodep_buf;
257 TrellisNode **nodes = nodep_buf; // nodes[] is always sorted by .ssd
258 TrellisNode **nodes_next = nodep_buf + frontier;
259 int pathn = 0, froze = -1, i, j, k, generation = 0;
260 uint8_t *hash = s->trellis_hash;
261 memset(hash, 0xff, 65536 * sizeof(*hash));
263 memset(nodep_buf, 0, 2 * frontier * sizeof(*nodep_buf));
264 nodes[0] = node_buf + frontier;
267 nodes[0]->step = c->step_index;
268 nodes[0]->sample1 = c->sample1;
269 nodes[0]->sample2 = c->sample2;
270 if((version == CODEC_ID_ADPCM_IMA_WAV) || (version == CODEC_ID_ADPCM_IMA_QT) || (version == CODEC_ID_ADPCM_SWF))
271 nodes[0]->sample1 = c->prev_sample;
272 if(version == CODEC_ID_ADPCM_MS)
273 nodes[0]->step = c->idelta;
274 if(version == CODEC_ID_ADPCM_YAMAHA) {
276 nodes[0]->step = 127;
277 nodes[0]->sample1 = 0;
279 nodes[0]->step = c->step;
280 nodes[0]->sample1 = c->predictor;
285 TrellisNode *t = node_buf + frontier*(i&1);
287 int sample = samples[i*stride];
289 memset(nodes_next, 0, frontier*sizeof(TrellisNode*));
290 for(j=0; j<frontier && nodes[j]; j++) {
291 // higher j have higher ssd already, so they're likely to yield a suboptimal next sample too
292 const int range = (j < frontier/2) ? 1 : 0;
293 const int step = nodes[j]->step;
295 if(version == CODEC_ID_ADPCM_MS) {
296 const int predictor = ((nodes[j]->sample1 * c->coeff1) + (nodes[j]->sample2 * c->coeff2)) / 64;
297 const int div = (sample - predictor) / step;
298 const int nmin = av_clip(div-range, -8, 6);
299 const int nmax = av_clip(div+range, -7, 7);
300 for(nidx=nmin; nidx<=nmax; nidx++) {
301 const int nibble = nidx & 0xf;
302 int dec_sample = predictor + nidx * step;
303 #define STORE_NODE(NAME, STEP_INDEX)\
309 dec_sample = av_clip_int16(dec_sample);\
310 d = sample - dec_sample;\
311 ssd = nodes[j]->ssd + d*d;\
312 /* Check for wraparound, skip such samples completely. \
313 * Note, changing ssd to a 64 bit variable would be \
314 * simpler, avoiding this check, but it's slower on \
315 * x86 32 bit at the moment. */\
316 if (ssd < nodes[j]->ssd)\
318 /* Collapse any two states with the same previous sample value. \
319 * One could also distinguish states by step and by 2nd to last
320 * sample, but the effects of that are negligible.
321 * Since nodes in the previous generation are iterated
322 * through a heap, they're roughly ordered from better to
323 * worse, but not strictly ordered. Therefore, an earlier
324 * node with the same sample value is better in most cases
325 * (and thus the current is skipped), but not strictly
326 * in all cases. Only skipping samples where ssd >=
327 * ssd of the earlier node with the same sample gives
328 * slightly worse quality, though, for some reason. */ \
329 h = &hash[(uint16_t) dec_sample];\
330 if (*h == generation)\
332 if (heap_pos < frontier) {\
335 /* Try to replace one of the leaf nodes with the new \
336 * one, but try a different slot each time. */\
337 pos = (frontier >> 1) + (heap_pos & ((frontier >> 1) - 1));\
338 if (ssd > nodes_next[pos]->ssd)\
343 u = nodes_next[pos];\
345 assert(pathn < FREEZE_INTERVAL<<avctx->trellis);\
347 nodes_next[pos] = u;\
351 u->step = STEP_INDEX;\
352 u->sample2 = nodes[j]->sample1;\
353 u->sample1 = dec_sample;\
354 paths[u->path].nibble = nibble;\
355 paths[u->path].prev = nodes[j]->path;\
356 /* Sift the newly inserted node up in the heap to \
357 * restore the heap property. */\
359 int parent = (pos - 1) >> 1;\
360 if (nodes_next[parent]->ssd <= ssd)\
362 FFSWAP(TrellisNode*, nodes_next[parent], nodes_next[pos]);\
366 STORE_NODE(ms, FFMAX(16, (ff_adpcm_AdaptationTable[nibble] * step) >> 8));
368 } else if((version == CODEC_ID_ADPCM_IMA_WAV)|| (version == CODEC_ID_ADPCM_IMA_QT)|| (version == CODEC_ID_ADPCM_SWF)) {
369 #define LOOP_NODES(NAME, STEP_TABLE, STEP_INDEX)\
370 const int predictor = nodes[j]->sample1;\
371 const int div = (sample - predictor) * 4 / STEP_TABLE;\
372 int nmin = av_clip(div-range, -7, 6);\
373 int nmax = av_clip(div+range, -6, 7);\
374 if(nmin<=0) nmin--; /* distinguish -0 from +0 */\
376 for(nidx=nmin; nidx<=nmax; nidx++) {\
377 const int nibble = nidx<0 ? 7-nidx : nidx;\
378 int dec_sample = predictor + (STEP_TABLE * ff_adpcm_yamaha_difflookup[nibble]) / 8;\
379 STORE_NODE(NAME, STEP_INDEX);\
381 LOOP_NODES(ima, ff_adpcm_step_table[step], av_clip(step + ff_adpcm_index_table[nibble], 0, 88));
382 } else { //CODEC_ID_ADPCM_YAMAHA
383 LOOP_NODES(yamaha, step, av_clip((step * ff_adpcm_yamaha_indexscale[nibble]) >> 8, 127, 24567));
394 if (generation == 255) {
395 memset(hash, 0xff, 65536 * sizeof(*hash));
400 if(nodes[0]->ssd > (1<<28)) {
401 for(j=1; j<frontier && nodes[j]; j++)
402 nodes[j]->ssd -= nodes[0]->ssd;
406 // merge old paths to save memory
407 if(i == froze + FREEZE_INTERVAL) {
408 p = &paths[nodes[0]->path];
409 for(k=i; k>froze; k--) {
415 // other nodes might use paths that don't coincide with the frozen one.
416 // checking which nodes do so is too slow, so just kill them all.
417 // this also slightly improves quality, but I don't know why.
418 memset(nodes+1, 0, (frontier-1)*sizeof(TrellisNode*));
422 p = &paths[nodes[0]->path];
423 for(i=n-1; i>froze; i--) {
428 c->predictor = nodes[0]->sample1;
429 c->sample1 = nodes[0]->sample1;
430 c->sample2 = nodes[0]->sample2;
431 c->step_index = nodes[0]->step;
432 c->step = nodes[0]->step;
433 c->idelta = nodes[0]->step;
436 static int adpcm_encode_frame(AVCodecContext *avctx,
437 unsigned char *frame, int buf_size, void *data)
442 ADPCMEncodeContext *c = avctx->priv_data;
446 samples = (short *)data;
447 st= avctx->channels == 2;
448 /* n = (BLKSIZE - 4 * avctx->channels) / (2 * 8 * avctx->channels); */
450 switch(avctx->codec->id) {
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[0];
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) {
470 FF_ALLOC_OR_GOTO(avctx, buf, 2*n*8, error);
471 adpcm_compress_trellis(avctx, samples, buf, &c->status[0], n*8);
472 if(avctx->channels == 2)
473 adpcm_compress_trellis(avctx, samples+1, buf + n*8, &c->status[1], n*8);
475 *dst++ = buf[8*i+0] | (buf[8*i+1] << 4);
476 *dst++ = buf[8*i+2] | (buf[8*i+3] << 4);
477 *dst++ = buf[8*i+4] | (buf[8*i+5] << 4);
478 *dst++ = buf[8*i+6] | (buf[8*i+7] << 4);
479 if (avctx->channels == 2) {
480 uint8_t *buf1 = buf + n*8;
481 *dst++ = buf1[8*i+0] | (buf1[8*i+1] << 4);
482 *dst++ = buf1[8*i+2] | (buf1[8*i+3] << 4);
483 *dst++ = buf1[8*i+4] | (buf1[8*i+5] << 4);
484 *dst++ = buf1[8*i+6] | (buf1[8*i+7] << 4);
490 *dst = adpcm_ima_compress_sample(&c->status[0], samples[0]);
491 *dst |= adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels]) << 4;
493 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 2]);
494 *dst |= adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 3]) << 4;
496 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 4]);
497 *dst |= adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 5]) << 4;
499 *dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 6]);
500 *dst |= adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 7]) << 4;
503 if (avctx->channels == 2) {
504 *dst = adpcm_ima_compress_sample(&c->status[1], samples[1]);
505 *dst |= adpcm_ima_compress_sample(&c->status[1], samples[3]) << 4;
507 *dst = adpcm_ima_compress_sample(&c->status[1], samples[5]);
508 *dst |= adpcm_ima_compress_sample(&c->status[1], samples[7]) << 4;
510 *dst = adpcm_ima_compress_sample(&c->status[1], samples[9]);
511 *dst |= adpcm_ima_compress_sample(&c->status[1], samples[11]) << 4;
513 *dst = adpcm_ima_compress_sample(&c->status[1], samples[13]);
514 *dst |= adpcm_ima_compress_sample(&c->status[1], samples[15]) << 4;
517 samples += 8 * avctx->channels;
520 case CODEC_ID_ADPCM_IMA_QT:
524 init_put_bits(&pb, dst, buf_size*8);
526 for(ch=0; ch<avctx->channels; ch++){
527 put_bits(&pb, 9, (c->status[ch].prev_sample + 0x10000) >> 7);
528 put_bits(&pb, 7, c->status[ch].step_index);
529 if(avctx->trellis > 0) {
531 adpcm_compress_trellis(avctx, samples+ch, buf, &c->status[ch], 64);
533 put_bits(&pb, 4, buf[i^1]);
535 for (i=0; i<64; i+=2){
537 t1 = adpcm_ima_qt_compress_sample(&c->status[ch], samples[avctx->channels*(i+0)+ch]);
538 t2 = adpcm_ima_qt_compress_sample(&c->status[ch], samples[avctx->channels*(i+1)+ch]);
539 put_bits(&pb, 4, t2);
540 put_bits(&pb, 4, t1);
546 dst += put_bits_count(&pb)>>3;
549 case CODEC_ID_ADPCM_SWF:
553 init_put_bits(&pb, dst, buf_size*8);
555 n = avctx->frame_size-1;
557 //Store AdpcmCodeSize
558 put_bits(&pb, 2, 2); //Set 4bits flash adpcm format
560 //Init the encoder state
561 for(i=0; i<avctx->channels; i++){
562 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 63); // clip step so it fits 6 bits
563 put_sbits(&pb, 16, samples[i]);
564 put_bits(&pb, 6, c->status[i].step_index);
565 c->status[i].prev_sample = (signed short)samples[i];
568 if(avctx->trellis > 0) {
569 FF_ALLOC_OR_GOTO(avctx, buf, 2*n, error);
570 adpcm_compress_trellis(avctx, samples+2, buf, &c->status[0], n);
571 if (avctx->channels == 2)
572 adpcm_compress_trellis(avctx, samples+3, buf+n, &c->status[1], n);
574 put_bits(&pb, 4, buf[i]);
575 if (avctx->channels == 2)
576 put_bits(&pb, 4, buf[n+i]);
580 for (i=1; i<avctx->frame_size; i++) {
581 put_bits(&pb, 4, adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels*i]));
582 if (avctx->channels == 2)
583 put_bits(&pb, 4, adpcm_ima_compress_sample(&c->status[1], samples[2*i+1]));
587 dst += put_bits_count(&pb)>>3;
590 case CODEC_ID_ADPCM_MS:
591 for(i=0; i<avctx->channels; i++){
595 c->status[i].coeff1 = ff_adpcm_AdaptCoeff1[predictor];
596 c->status[i].coeff2 = ff_adpcm_AdaptCoeff2[predictor];
598 for(i=0; i<avctx->channels; i++){
599 if (c->status[i].idelta < 16)
600 c->status[i].idelta = 16;
602 bytestream_put_le16(&dst, c->status[i].idelta);
604 for(i=0; i<avctx->channels; i++){
605 c->status[i].sample2= *samples++;
607 for(i=0; i<avctx->channels; i++){
608 c->status[i].sample1= *samples++;
610 bytestream_put_le16(&dst, c->status[i].sample1);
612 for(i=0; i<avctx->channels; i++)
613 bytestream_put_le16(&dst, c->status[i].sample2);
615 if(avctx->trellis > 0) {
616 int n = avctx->block_align - 7*avctx->channels;
617 FF_ALLOC_OR_GOTO(avctx, buf, 2*n, error);
618 if(avctx->channels == 1) {
619 adpcm_compress_trellis(avctx, samples, buf, &c->status[0], n);
621 *dst++ = (buf[i] << 4) | buf[i+1];
623 adpcm_compress_trellis(avctx, samples, buf, &c->status[0], n);
624 adpcm_compress_trellis(avctx, samples+1, buf+n, &c->status[1], n);
626 *dst++ = (buf[i] << 4) | buf[n+i];
630 for(i=7*avctx->channels; i<avctx->block_align; i++) {
632 nibble = adpcm_ms_compress_sample(&c->status[ 0], *samples++)<<4;
633 nibble|= adpcm_ms_compress_sample(&c->status[st], *samples++);
637 case CODEC_ID_ADPCM_YAMAHA:
638 n = avctx->frame_size / 2;
639 if(avctx->trellis > 0) {
640 FF_ALLOC_OR_GOTO(avctx, buf, 2*n*2, error);
642 if(avctx->channels == 1) {
643 adpcm_compress_trellis(avctx, samples, buf, &c->status[0], n);
645 *dst++ = buf[i] | (buf[i+1] << 4);
647 adpcm_compress_trellis(avctx, samples, buf, &c->status[0], n);
648 adpcm_compress_trellis(avctx, samples+1, buf+n, &c->status[1], n);
650 *dst++ = buf[i] | (buf[n+i] << 4);
654 for (n *= avctx->channels; n>0; n--) {
656 nibble = adpcm_yamaha_compress_sample(&c->status[ 0], *samples++);
657 nibble |= adpcm_yamaha_compress_sample(&c->status[st], *samples++) << 4;
669 #define ADPCM_ENCODER(id_, name_, long_name_) \
670 AVCodec ff_ ## name_ ## _encoder = { \
672 .type = AVMEDIA_TYPE_AUDIO, \
674 .priv_data_size = sizeof(ADPCMEncodeContext), \
675 .init = adpcm_encode_init, \
676 .encode = adpcm_encode_frame, \
677 .close = adpcm_encode_close, \
678 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE}, \
679 .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
682 ADPCM_ENCODER(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt, "ADPCM IMA QuickTime");
683 ADPCM_ENCODER(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, "ADPCM IMA WAV");
684 ADPCM_ENCODER(CODEC_ID_ADPCM_MS, adpcm_ms, "ADPCM Microsoft");
685 ADPCM_ENCODER(CODEC_ID_ADPCM_SWF, adpcm_swf, "ADPCM Shockwave Flash");
686 ADPCM_ENCODER(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha, "ADPCM Yamaha");