2 * Copyright (c) 2001-2003 The ffmpeg Project
4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "bytestream.h"
25 #include "adpcm_data.h"
30 * First version by Francois Revol (revol@free.fr)
31 * Fringe ADPCM codecs (e.g., DK3, DK4, Westwood)
32 * by Mike Melanson (melanson@pcisys.net)
33 * CD-ROM XA ADPCM codec by BERO
34 * EA ADPCM decoder by Robin Kay (komadori@myrealbox.com)
35 * EA ADPCM R1/R2/R3 decoder by Peter Ross (pross@xvid.org)
36 * EA IMA EACS decoder by Peter Ross (pross@xvid.org)
37 * EA IMA SEAD decoder by Peter Ross (pross@xvid.org)
38 * EA ADPCM XAS decoder by Peter Ross (pross@xvid.org)
39 * MAXIS EA ADPCM decoder by Robert Marston (rmarston@gmail.com)
40 * THP ADPCM decoder by Marco Gerards (mgerards@xs4all.nl)
42 * Features and limitations:
44 * Reference documents:
45 * http://wiki.multimedia.cx/index.php?title=Category:ADPCM_Audio_Codecs
46 * http://www.pcisys.net/~melanson/codecs/simpleaudio.html [dead]
47 * http://www.geocities.com/SiliconValley/8682/aud3.txt [dead]
48 * http://openquicktime.sourceforge.net/
49 * XAnim sources (xa_codec.c) http://xanim.polter.net/
50 * http://www.cs.ucla.edu/~leec/mediabench/applications.html [dead]
51 * SoX source code http://sox.sourceforge.net/
54 * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html [dead]
55 * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html [dead]
56 * readstr http://www.geocities.co.jp/Playtown/2004/
59 /* These are for CD-ROM XA ADPCM */
60 static const int xa_adpcm_table[5][2] = {
68 static const int ea_adpcm_table[] = {
76 // padded to zero where table size is less then 16
77 static const int swf_index_tables[4][16] = {
79 /*3*/ { -1, -1, 2, 4 },
80 /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },
81 /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }
86 typedef struct ADPCMDecodeContext {
88 ADPCMChannelStatus status[6];
89 int vqa_version; /**< VQA version. Used for ADPCM_IMA_WS */
92 static av_cold int adpcm_decode_init(AVCodecContext * avctx)
94 ADPCMDecodeContext *c = avctx->priv_data;
95 unsigned int min_channels = 1;
96 unsigned int max_channels = 2;
98 switch(avctx->codec->id) {
99 case CODEC_ID_ADPCM_EA:
102 case CODEC_ID_ADPCM_EA_R1:
103 case CODEC_ID_ADPCM_EA_R2:
104 case CODEC_ID_ADPCM_EA_R3:
105 case CODEC_ID_ADPCM_EA_XAS:
109 if (avctx->channels < min_channels || avctx->channels > max_channels) {
110 av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
111 return AVERROR(EINVAL);
114 switch(avctx->codec->id) {
115 case CODEC_ID_ADPCM_CT:
116 c->status[0].step = c->status[1].step = 511;
118 case CODEC_ID_ADPCM_IMA_WAV:
119 if (avctx->bits_per_coded_sample != 4) {
120 av_log(avctx, AV_LOG_ERROR, "Only 4-bit ADPCM IMA WAV files are supported\n");
124 case CODEC_ID_ADPCM_IMA_APC:
125 if (avctx->extradata && avctx->extradata_size >= 8) {
126 c->status[0].predictor = AV_RL32(avctx->extradata);
127 c->status[1].predictor = AV_RL32(avctx->extradata + 4);
130 case CODEC_ID_ADPCM_IMA_WS:
131 if (avctx->extradata && avctx->extradata_size >= 42)
132 c->vqa_version = AV_RL16(avctx->extradata);
137 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
139 avcodec_get_frame_defaults(&c->frame);
140 avctx->coded_frame = &c->frame;
145 static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)
149 int sign, delta, diff, step;
151 step = ff_adpcm_step_table[c->step_index];
152 step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];
153 if (step_index < 0) step_index = 0;
154 else if (step_index > 88) step_index = 88;
158 /* perform direct multiplication instead of series of jumps proposed by
159 * the reference ADPCM implementation since modern CPUs can do the mults
161 diff = ((2 * delta + 1) * step) >> shift;
162 predictor = c->predictor;
163 if (sign) predictor -= diff;
164 else predictor += diff;
166 c->predictor = av_clip_int16(predictor);
167 c->step_index = step_index;
169 return (short)c->predictor;
172 static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble, int shift)
178 step = ff_adpcm_step_table[c->step_index];
179 step_index = c->step_index + ff_adpcm_index_table[nibble];
180 step_index = av_clip(step_index, 0, 88);
183 if (nibble & 4) diff += step;
184 if (nibble & 2) diff += step >> 1;
185 if (nibble & 1) diff += step >> 2;
188 predictor = c->predictor - diff;
190 predictor = c->predictor + diff;
192 c->predictor = av_clip_int16(predictor);
193 c->step_index = step_index;
198 static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
202 predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;
203 predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
205 c->sample2 = c->sample1;
206 c->sample1 = av_clip_int16(predictor);
207 c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;
208 if (c->idelta < 16) c->idelta = 16;
213 static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)
215 int sign, delta, diff;
220 /* perform direct multiplication instead of series of jumps proposed by
221 * the reference ADPCM implementation since modern CPUs can do the mults
223 diff = ((2 * delta + 1) * c->step) >> 3;
224 /* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */
225 c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);
226 c->predictor = av_clip_int16(c->predictor);
227 /* calculate new step and clamp it to range 511..32767 */
228 new_step = (ff_adpcm_AdaptationTable[nibble & 7] * c->step) >> 8;
229 c->step = av_clip(new_step, 511, 32767);
231 return (short)c->predictor;
234 static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)
236 int sign, delta, diff;
238 sign = nibble & (1<<(size-1));
239 delta = nibble & ((1<<(size-1))-1);
240 diff = delta << (7 + c->step + shift);
243 c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);
245 /* calculate new step */
246 if (delta >= (2*size - 3) && c->step < 3)
248 else if (delta == 0 && c->step > 0)
251 return (short) c->predictor;
254 static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)
261 c->predictor += (c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8;
262 c->predictor = av_clip_int16(c->predictor);
263 c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;
264 c->step = av_clip(c->step, 127, 24567);
268 static void xa_decode(short *out, const unsigned char *in,
269 ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)
272 int shift,filter,f0,f1;
278 shift = 12 - (in[4+i*2] & 15);
279 filter = in[4+i*2] >> 4;
280 f0 = xa_adpcm_table[filter][0];
281 f1 = xa_adpcm_table[filter][1];
289 t = (signed char)(d<<4)>>4;
290 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
292 s_1 = av_clip_int16(s);
297 if (inc==2) { /* stereo */
300 s_1 = right->sample1;
301 s_2 = right->sample2;
302 out = out + 1 - 28*2;
305 shift = 12 - (in[5+i*2] & 15);
306 filter = in[5+i*2] >> 4;
308 f0 = xa_adpcm_table[filter][0];
309 f1 = xa_adpcm_table[filter][1];
314 t = (signed char)d >> 4;
315 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
317 s_1 = av_clip_int16(s);
322 if (inc==2) { /* stereo */
323 right->sample1 = s_1;
324 right->sample2 = s_2;
334 * Get the number of samples that will be decoded from the packet.
335 * In one case, this is actually the maximum number of samples possible to
336 * decode with the given buf_size.
338 * @param[out] coded_samples set to the number of samples as coded in the
339 * packet, or 0 if the codec does not encode the
340 * number of samples in each frame.
342 static int get_nb_samples(AVCodecContext *avctx, const uint8_t *buf,
343 int buf_size, int *coded_samples)
345 ADPCMDecodeContext *s = avctx->priv_data;
347 int ch = avctx->channels;
348 int has_coded_samples = 0;
353 switch (avctx->codec->id) {
354 /* constant, only check buf_size */
355 case CODEC_ID_ADPCM_EA_XAS:
356 if (buf_size < 76 * ch)
360 case CODEC_ID_ADPCM_IMA_QT:
361 if (buf_size < 34 * ch)
365 /* simple 4-bit adpcm */
366 case CODEC_ID_ADPCM_CT:
367 case CODEC_ID_ADPCM_IMA_APC:
368 case CODEC_ID_ADPCM_IMA_EA_SEAD:
369 case CODEC_ID_ADPCM_IMA_WS:
370 case CODEC_ID_ADPCM_YAMAHA:
371 nb_samples = buf_size * 2 / ch;
377 /* simple 4-bit adpcm, with header */
379 switch (avctx->codec->id) {
380 case CODEC_ID_ADPCM_4XM:
381 case CODEC_ID_ADPCM_IMA_ISS: header_size = 4 * ch; break;
382 case CODEC_ID_ADPCM_IMA_AMV: header_size = 8; break;
383 case CODEC_ID_ADPCM_IMA_SMJPEG: header_size = 4; break;
386 return (buf_size - header_size) * 2 / ch;
388 /* more complex formats */
389 switch (avctx->codec->id) {
390 case CODEC_ID_ADPCM_EA:
391 has_coded_samples = 1;
394 *coded_samples = AV_RL32(buf);
395 *coded_samples -= *coded_samples % 28;
396 nb_samples = (buf_size - 12) / 30 * 28;
398 case CODEC_ID_ADPCM_IMA_EA_EACS:
399 has_coded_samples = 1;
402 *coded_samples = AV_RL32(buf);
403 nb_samples = (buf_size - (4 + 8 * ch)) * 2 / ch;
405 case CODEC_ID_ADPCM_EA_MAXIS_XA:
406 nb_samples = ((buf_size - ch) / (2 * ch)) * 2 * ch;
408 case CODEC_ID_ADPCM_EA_R1:
409 case CODEC_ID_ADPCM_EA_R2:
410 case CODEC_ID_ADPCM_EA_R3:
411 /* maximum number of samples */
412 /* has internal offsets and a per-frame switch to signal raw 16-bit */
413 has_coded_samples = 1;
416 switch (avctx->codec->id) {
417 case CODEC_ID_ADPCM_EA_R1:
418 header_size = 4 + 9 * ch;
419 *coded_samples = AV_RL32(buf);
421 case CODEC_ID_ADPCM_EA_R2:
422 header_size = 4 + 5 * ch;
423 *coded_samples = AV_RL32(buf);
425 case CODEC_ID_ADPCM_EA_R3:
426 header_size = 4 + 5 * ch;
427 *coded_samples = AV_RB32(buf);
430 *coded_samples -= *coded_samples % 28;
431 nb_samples = (buf_size - header_size) * 2 / ch;
432 nb_samples -= nb_samples % 28;
434 case CODEC_ID_ADPCM_IMA_DK3:
435 if (avctx->block_align > 0)
436 buf_size = FFMIN(buf_size, avctx->block_align);
437 nb_samples = ((buf_size - 16) * 8 / 3) / ch;
439 case CODEC_ID_ADPCM_IMA_DK4:
440 nb_samples = 1 + (buf_size - 4 * ch) * 2 / ch;
442 case CODEC_ID_ADPCM_IMA_WAV:
443 if (avctx->block_align > 0)
444 buf_size = FFMIN(buf_size, avctx->block_align);
445 nb_samples = 1 + (buf_size - 4 * ch) / (4 * ch) * 8;
447 case CODEC_ID_ADPCM_MS:
448 if (avctx->block_align > 0)
449 buf_size = FFMIN(buf_size, avctx->block_align);
450 nb_samples = 2 + (buf_size - 7 * ch) * 2 / ch;
452 case CODEC_ID_ADPCM_SBPRO_2:
453 case CODEC_ID_ADPCM_SBPRO_3:
454 case CODEC_ID_ADPCM_SBPRO_4:
456 int samples_per_byte;
457 switch (avctx->codec->id) {
458 case CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;
459 case CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;
460 case CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;
462 if (!s->status[0].step_index) {
466 nb_samples += buf_size * samples_per_byte / ch;
469 case CODEC_ID_ADPCM_SWF:
471 int buf_bits = buf_size * 8 - 2;
472 int nbits = (buf[0] >> 6) + 2;
473 int block_hdr_size = 22 * ch;
474 int block_size = block_hdr_size + nbits * ch * 4095;
475 int nblocks = buf_bits / block_size;
476 int bits_left = buf_bits - nblocks * block_size;
477 nb_samples = nblocks * 4096;
478 if (bits_left >= block_hdr_size)
479 nb_samples += 1 + (bits_left - block_hdr_size) / (nbits * ch);
482 case CODEC_ID_ADPCM_THP:
483 has_coded_samples = 1;
486 *coded_samples = AV_RB32(&buf[4]);
487 *coded_samples -= *coded_samples % 14;
488 nb_samples = (buf_size - 80) / (8 * ch) * 14;
490 case CODEC_ID_ADPCM_XA:
491 nb_samples = (buf_size / 128) * 224 / ch;
495 /* validate coded sample count */
496 if (has_coded_samples && (*coded_samples <= 0 || *coded_samples > nb_samples))
497 return AVERROR_INVALIDDATA;
502 /* DK3 ADPCM support macro */
503 #define DK3_GET_NEXT_NIBBLE() \
504 if (decode_top_nibble_next) \
506 nibble = last_byte >> 4; \
507 decode_top_nibble_next = 0; \
513 last_byte = *src++; \
514 if (src >= buf + buf_size) \
516 nibble = last_byte & 0x0F; \
517 decode_top_nibble_next = 1; \
520 static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
521 int *got_frame_ptr, AVPacket *avpkt)
523 const uint8_t *buf = avpkt->data;
524 int buf_size = avpkt->size;
525 ADPCMDecodeContext *c = avctx->priv_data;
526 ADPCMChannelStatus *cs;
527 int n, m, channel, i;
532 int nb_samples, coded_samples, ret;
534 nb_samples = get_nb_samples(avctx, buf, buf_size, &coded_samples);
535 if (nb_samples <= 0) {
536 av_log(avctx, AV_LOG_ERROR, "invalid number of samples in packet\n");
537 return AVERROR_INVALIDDATA;
540 /* get output buffer */
541 c->frame.nb_samples = nb_samples;
542 if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0) {
543 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
546 samples = (short *)c->frame.data[0];
548 /* use coded_samples when applicable */
549 /* it is always <= nb_samples, so the output buffer will be large enough */
551 if (coded_samples != nb_samples)
552 av_log(avctx, AV_LOG_WARNING, "mismatch in coded sample count\n");
553 c->frame.nb_samples = nb_samples = coded_samples;
558 st = avctx->channels == 2 ? 1 : 0;
560 switch(avctx->codec->id) {
561 case CODEC_ID_ADPCM_IMA_QT:
562 /* In QuickTime, IMA is encoded by chunks of 34 bytes (=64 samples).
563 Channel data is interleaved per-chunk. */
564 for (channel = 0; channel < avctx->channels; channel++) {
567 cs = &(c->status[channel]);
568 /* (pppppp) (piiiiiii) */
570 /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
571 predictor = AV_RB16(src);
572 step_index = predictor & 0x7F;
577 if (cs->step_index == step_index) {
578 int diff = (int)predictor - cs->predictor;
585 cs->step_index = step_index;
586 cs->predictor = predictor;
589 if (cs->step_index > 88){
590 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
594 samples = (short *)c->frame.data[0] + channel;
596 for (m = 0; m < 32; m++) {
597 *samples = adpcm_ima_qt_expand_nibble(cs, src[0] & 0x0F, 3);
598 samples += avctx->channels;
599 *samples = adpcm_ima_qt_expand_nibble(cs, src[0] >> 4 , 3);
600 samples += avctx->channels;
605 case CODEC_ID_ADPCM_IMA_WAV:
606 if (avctx->block_align != 0 && buf_size > avctx->block_align)
607 buf_size = avctx->block_align;
609 for(i=0; i<avctx->channels; i++){
610 cs = &(c->status[i]);
611 cs->predictor = *samples++ = (int16_t)bytestream_get_le16(&src);
613 cs->step_index = *src++;
614 if (cs->step_index > 88){
615 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
618 if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null but is %d!!\n", src[-1]); /* unused */
621 for (n = (nb_samples - 1) / 8; n > 0; n--) {
622 for (i = 0; i < avctx->channels; i++) {
624 for (m = 0; m < 4; m++) {
626 *samples = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);
627 samples += avctx->channels;
628 *samples = adpcm_ima_expand_nibble(cs, v >> 4 , 3);
629 samples += avctx->channels;
631 samples -= 8 * avctx->channels - 1;
633 samples += 7 * avctx->channels;
636 case CODEC_ID_ADPCM_4XM:
637 for (i = 0; i < avctx->channels; i++)
638 c->status[i].predictor= (int16_t)bytestream_get_le16(&src);
640 for (i = 0; i < avctx->channels; i++) {
641 c->status[i].step_index= (int16_t)bytestream_get_le16(&src);
642 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
645 for (i = 0; i < avctx->channels; i++) {
646 samples = (short *)c->frame.data[0] + i;
648 for (n = nb_samples >> 1; n > 0; n--, src++) {
650 *samples = adpcm_ima_expand_nibble(cs, v & 0x0F, 4);
651 samples += avctx->channels;
652 *samples = adpcm_ima_expand_nibble(cs, v >> 4 , 4);
653 samples += avctx->channels;
657 case CODEC_ID_ADPCM_MS:
661 if (avctx->block_align != 0 && buf_size > avctx->block_align)
662 buf_size = avctx->block_align;
664 block_predictor = av_clip(*src++, 0, 6);
665 c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
666 c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
668 block_predictor = av_clip(*src++, 0, 6);
669 c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
670 c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
672 c->status[0].idelta = (int16_t)bytestream_get_le16(&src);
674 c->status[1].idelta = (int16_t)bytestream_get_le16(&src);
677 c->status[0].sample1 = bytestream_get_le16(&src);
678 if (st) c->status[1].sample1 = bytestream_get_le16(&src);
679 c->status[0].sample2 = bytestream_get_le16(&src);
680 if (st) c->status[1].sample2 = bytestream_get_le16(&src);
682 *samples++ = c->status[0].sample2;
683 if (st) *samples++ = c->status[1].sample2;
684 *samples++ = c->status[0].sample1;
685 if (st) *samples++ = c->status[1].sample1;
686 for(n = (nb_samples - 2) >> (1 - st); n > 0; n--, src++) {
687 *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], src[0] >> 4 );
688 *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
692 case CODEC_ID_ADPCM_IMA_DK4:
693 if (avctx->block_align != 0 && buf_size > avctx->block_align)
694 buf_size = avctx->block_align;
696 for (channel = 0; channel < avctx->channels; channel++) {
697 cs = &c->status[channel];
698 cs->predictor = (int16_t)bytestream_get_le16(&src);
699 cs->step_index = *src++;
701 *samples++ = cs->predictor;
703 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
705 *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4 , 3);
706 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
709 case CODEC_ID_ADPCM_IMA_DK3:
711 unsigned char last_byte = 0;
712 unsigned char nibble;
713 int decode_top_nibble_next = 0;
714 int end_of_packet = 0;
717 if (avctx->block_align != 0 && buf_size > avctx->block_align)
718 buf_size = avctx->block_align;
720 c->status[0].predictor = (int16_t)AV_RL16(src + 10);
721 c->status[1].predictor = (int16_t)AV_RL16(src + 12);
722 c->status[0].step_index = src[14];
723 c->status[1].step_index = src[15];
724 /* sign extend the predictors */
726 diff_channel = c->status[1].predictor;
728 /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when
729 * the buffer is consumed */
732 /* for this algorithm, c->status[0] is the sum channel and
733 * c->status[1] is the diff channel */
735 /* process the first predictor of the sum channel */
736 DK3_GET_NEXT_NIBBLE();
737 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
739 /* process the diff channel predictor */
740 DK3_GET_NEXT_NIBBLE();
741 adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
743 /* process the first pair of stereo PCM samples */
744 diff_channel = (diff_channel + c->status[1].predictor) / 2;
745 *samples++ = c->status[0].predictor + c->status[1].predictor;
746 *samples++ = c->status[0].predictor - c->status[1].predictor;
748 /* process the second predictor of the sum channel */
749 DK3_GET_NEXT_NIBBLE();
750 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
752 /* process the second pair of stereo PCM samples */
753 diff_channel = (diff_channel + c->status[1].predictor) / 2;
754 *samples++ = c->status[0].predictor + c->status[1].predictor;
755 *samples++ = c->status[0].predictor - c->status[1].predictor;
759 case CODEC_ID_ADPCM_IMA_ISS:
760 for (channel = 0; channel < avctx->channels; channel++) {
761 cs = &c->status[channel];
762 cs->predictor = (int16_t)bytestream_get_le16(&src);
763 cs->step_index = *src++;
767 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
770 /* nibbles are swapped for mono */
778 *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);
779 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);
782 case CODEC_ID_ADPCM_IMA_APC:
783 while (src < buf + buf_size) {
785 *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4 , 3);
786 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
789 case CODEC_ID_ADPCM_IMA_WS:
790 for (channel = 0; channel < avctx->channels; channel++) {
793 int16_t *smp = samples + channel;
795 if (c->vqa_version == 3) {
796 src0 = src + channel * buf_size / 2;
799 src0 = src + channel;
800 src_stride = avctx->channels;
802 for (n = nb_samples / 2; n > 0; n--) {
805 *smp = adpcm_ima_expand_nibble(&c->status[channel], v >> 4 , 3);
806 smp += avctx->channels;
807 *smp = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);
808 smp += avctx->channels;
811 src = buf + buf_size;
813 case CODEC_ID_ADPCM_XA:
814 while (buf_size >= 128) {
815 xa_decode(samples, src, &c->status[0], &c->status[1],
822 case CODEC_ID_ADPCM_IMA_EA_EACS:
823 src += 4; // skip sample count (already read)
825 for (i=0; i<=st; i++)
826 c->status[i].step_index = bytestream_get_le32(&src);
827 for (i=0; i<=st; i++)
828 c->status[i].predictor = bytestream_get_le32(&src);
830 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
831 *samples++ = adpcm_ima_expand_nibble(&c->status[0], *src>>4, 3);
832 *samples++ = adpcm_ima_expand_nibble(&c->status[st], *src&0x0F, 3);
835 case CODEC_ID_ADPCM_IMA_EA_SEAD:
836 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
837 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] >> 4, 6);
838 *samples++ = adpcm_ima_expand_nibble(&c->status[st],src[0]&0x0F, 6);
841 case CODEC_ID_ADPCM_EA:
843 int32_t previous_left_sample, previous_right_sample;
844 int32_t current_left_sample, current_right_sample;
845 int32_t next_left_sample, next_right_sample;
846 int32_t coeff1l, coeff2l, coeff1r, coeff2r;
847 uint8_t shift_left, shift_right;
849 /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,
850 each coding 28 stereo samples. */
852 src += 4; // skip sample count (already read)
854 current_left_sample = (int16_t)bytestream_get_le16(&src);
855 previous_left_sample = (int16_t)bytestream_get_le16(&src);
856 current_right_sample = (int16_t)bytestream_get_le16(&src);
857 previous_right_sample = (int16_t)bytestream_get_le16(&src);
859 for (count1 = 0; count1 < nb_samples / 28; count1++) {
860 coeff1l = ea_adpcm_table[ *src >> 4 ];
861 coeff2l = ea_adpcm_table[(*src >> 4 ) + 4];
862 coeff1r = ea_adpcm_table[*src & 0x0F];
863 coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];
866 shift_left = 20 - (*src >> 4);
867 shift_right = 20 - (*src & 0x0F);
870 for (count2 = 0; count2 < 28; count2++) {
871 next_left_sample = sign_extend(*src >> 4, 4) << shift_left;
872 next_right_sample = sign_extend(*src, 4) << shift_right;
875 next_left_sample = (next_left_sample +
876 (current_left_sample * coeff1l) +
877 (previous_left_sample * coeff2l) + 0x80) >> 8;
878 next_right_sample = (next_right_sample +
879 (current_right_sample * coeff1r) +
880 (previous_right_sample * coeff2r) + 0x80) >> 8;
882 previous_left_sample = current_left_sample;
883 current_left_sample = av_clip_int16(next_left_sample);
884 previous_right_sample = current_right_sample;
885 current_right_sample = av_clip_int16(next_right_sample);
886 *samples++ = (unsigned short)current_left_sample;
887 *samples++ = (unsigned short)current_right_sample;
891 if (src - buf == buf_size - 2)
892 src += 2; // Skip terminating 0x0000
896 case CODEC_ID_ADPCM_EA_MAXIS_XA:
898 int coeff[2][2], shift[2];
900 for(channel = 0; channel < avctx->channels; channel++) {
902 coeff[channel][i] = ea_adpcm_table[(*src >> 4) + 4*i];
903 shift[channel] = 20 - (*src & 0x0F);
906 for (count1 = 0; count1 < nb_samples / 2; count1++) {
907 for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */
908 for(channel = 0; channel < avctx->channels; channel++) {
909 int32_t sample = sign_extend(src[channel] >> i, 4) << shift[channel];
911 c->status[channel].sample1 * coeff[channel][0] +
912 c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;
913 c->status[channel].sample2 = c->status[channel].sample1;
914 c->status[channel].sample1 = av_clip_int16(sample);
915 *samples++ = c->status[channel].sample1;
918 src+=avctx->channels;
920 /* consume whole packet */
921 src = buf + buf_size;
924 case CODEC_ID_ADPCM_EA_R1:
925 case CODEC_ID_ADPCM_EA_R2:
926 case CODEC_ID_ADPCM_EA_R3: {
929 4chan: 0=fl, 1=rl, 2=fr, 3=rr
930 6chan: 0=fl, 1=c, 2=fr, 3=rl, 4=rr, 5=sub */
931 const int big_endian = avctx->codec->id == CODEC_ID_ADPCM_EA_R3;
932 int32_t previous_sample, current_sample, next_sample;
933 int32_t coeff1, coeff2;
935 unsigned int channel;
938 const uint8_t *src_end = buf + buf_size;
941 src += 4; // skip sample count (already read)
943 for (channel=0; channel<avctx->channels; channel++) {
944 int32_t offset = (big_endian ? bytestream_get_be32(&src)
945 : bytestream_get_le32(&src))
946 + (avctx->channels-channel-1) * 4;
948 if ((offset < 0) || (offset >= src_end - src - 4)) break;
950 samplesC = samples + channel;
952 if (avctx->codec->id == CODEC_ID_ADPCM_EA_R1) {
953 current_sample = (int16_t)bytestream_get_le16(&srcC);
954 previous_sample = (int16_t)bytestream_get_le16(&srcC);
956 current_sample = c->status[channel].predictor;
957 previous_sample = c->status[channel].prev_sample;
960 for (count1 = 0; count1 < nb_samples / 28; count1++) {
961 if (*srcC == 0xEE) { /* only seen in R2 and R3 */
963 if (srcC > src_end - 30*2) break;
964 current_sample = (int16_t)bytestream_get_be16(&srcC);
965 previous_sample = (int16_t)bytestream_get_be16(&srcC);
967 for (count2=0; count2<28; count2++) {
968 *samplesC = (int16_t)bytestream_get_be16(&srcC);
969 samplesC += avctx->channels;
972 coeff1 = ea_adpcm_table[ *srcC>>4 ];
973 coeff2 = ea_adpcm_table[(*srcC>>4) + 4];
974 shift = 20 - (*srcC++ & 0x0F);
976 if (srcC > src_end - 14) break;
977 for (count2=0; count2<28; count2++) {
979 next_sample = sign_extend(*srcC++, 4) << shift;
981 next_sample = sign_extend(*srcC >> 4, 4) << shift;
983 next_sample += (current_sample * coeff1) +
984 (previous_sample * coeff2);
985 next_sample = av_clip_int16(next_sample >> 8);
987 previous_sample = current_sample;
988 current_sample = next_sample;
989 *samplesC = current_sample;
990 samplesC += avctx->channels;
996 } else if (count != count1) {
997 av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");
998 count = FFMAX(count, count1);
1001 if (avctx->codec->id != CODEC_ID_ADPCM_EA_R1) {
1002 c->status[channel].predictor = current_sample;
1003 c->status[channel].prev_sample = previous_sample;
1007 c->frame.nb_samples = count * 28;
1011 case CODEC_ID_ADPCM_EA_XAS:
1012 for (channel=0; channel<avctx->channels; channel++) {
1013 int coeff[2][4], shift[4];
1014 short *s2, *s = &samples[channel];
1015 for (n=0; n<4; n++, s+=32*avctx->channels) {
1017 coeff[i][n] = ea_adpcm_table[(src[0]&0x0F)+4*i];
1018 shift[n] = 20 - (src[2] & 0x0F);
1019 for (s2=s, i=0; i<2; i++, src+=2, s2+=avctx->channels)
1020 s2[0] = (src[0]&0xF0) + (src[1]<<8);
1023 for (m=2; m<32; m+=2) {
1024 s = &samples[m*avctx->channels + channel];
1025 for (n=0; n<4; n++, src++, s+=32*avctx->channels) {
1026 for (s2=s, i=0; i<8; i+=4, s2+=avctx->channels) {
1027 int level = sign_extend(*src >> (4 - i), 4) << shift[n];
1028 int pred = s2[-1*avctx->channels] * coeff[0][n]
1029 + s2[-2*avctx->channels] * coeff[1][n];
1030 s2[0] = av_clip_int16((level + pred + 0x80) >> 8);
1036 case CODEC_ID_ADPCM_IMA_AMV:
1037 case CODEC_ID_ADPCM_IMA_SMJPEG:
1038 if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV) {
1039 c->status[0].predictor = sign_extend(bytestream_get_le16(&src), 16);
1040 c->status[0].step_index = bytestream_get_le16(&src);
1043 c->status[0].predictor = sign_extend(bytestream_get_be16(&src), 16);
1044 c->status[0].step_index = bytestream_get_byte(&src);
1048 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
1053 if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
1054 FFSWAP(char, hi, lo);
1056 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1058 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1062 case CODEC_ID_ADPCM_CT:
1063 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
1065 *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4 );
1066 *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);
1069 case CODEC_ID_ADPCM_SBPRO_4:
1070 case CODEC_ID_ADPCM_SBPRO_3:
1071 case CODEC_ID_ADPCM_SBPRO_2:
1072 if (!c->status[0].step_index) {
1073 /* the first byte is a raw sample */
1074 *samples++ = 128 * (*src++ - 0x80);
1076 *samples++ = 128 * (*src++ - 0x80);
1077 c->status[0].step_index = 1;
1080 if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {
1081 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
1082 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1084 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1085 src[0] & 0x0F, 4, 0);
1087 } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {
1088 for (n = nb_samples / 3; n > 0; n--, src++) {
1089 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1090 src[0] >> 5 , 3, 0);
1091 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1092 (src[0] >> 2) & 0x07, 3, 0);
1093 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1094 src[0] & 0x03, 2, 0);
1097 for (n = nb_samples >> (2 - st); n > 0; n--, src++) {
1098 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1099 src[0] >> 6 , 2, 2);
1100 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1101 (src[0] >> 4) & 0x03, 2, 2);
1102 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1103 (src[0] >> 2) & 0x03, 2, 2);
1104 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1105 src[0] & 0x03, 2, 2);
1109 case CODEC_ID_ADPCM_SWF:
1113 int k0, signmask, nb_bits, count;
1114 int size = buf_size*8;
1116 init_get_bits(&gb, buf, size);
1118 //read bits & initial values
1119 nb_bits = get_bits(&gb, 2)+2;
1120 //av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits);
1121 table = swf_index_tables[nb_bits-2];
1122 k0 = 1 << (nb_bits-2);
1123 signmask = 1 << (nb_bits-1);
1125 while (get_bits_count(&gb) <= size - 22*avctx->channels) {
1126 for (i = 0; i < avctx->channels; i++) {
1127 *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
1128 c->status[i].step_index = get_bits(&gb, 6);
1131 for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {
1134 for (i = 0; i < avctx->channels; i++) {
1135 // similar to IMA adpcm
1136 int delta = get_bits(&gb, nb_bits);
1137 int step = ff_adpcm_step_table[c->status[i].step_index];
1138 long vpdiff = 0; // vpdiff = (delta+0.5)*step/4
1149 if (delta & signmask)
1150 c->status[i].predictor -= vpdiff;
1152 c->status[i].predictor += vpdiff;
1154 c->status[i].step_index += table[delta & (~signmask)];
1156 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
1157 c->status[i].predictor = av_clip_int16(c->status[i].predictor);
1159 *samples++ = c->status[i].predictor;
1166 case CODEC_ID_ADPCM_YAMAHA:
1167 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
1169 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);
1170 *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4 );
1173 case CODEC_ID_ADPCM_THP:
1179 src += 4; // skip channel size
1180 src += 4; // skip number of samples (already read)
1182 for (i = 0; i < 32; i++)
1183 table[0][i] = (int16_t)bytestream_get_be16(&src);
1185 /* Initialize the previous sample. */
1186 for (i = 0; i < 4; i++)
1187 prev[0][i] = (int16_t)bytestream_get_be16(&src);
1189 for (ch = 0; ch <= st; ch++) {
1190 samples = (short *)c->frame.data[0] + ch;
1192 /* Read in every sample for this channel. */
1193 for (i = 0; i < nb_samples / 14; i++) {
1194 int index = (*src >> 4) & 7;
1195 unsigned int exp = *src++ & 15;
1196 int factor1 = table[ch][index * 2];
1197 int factor2 = table[ch][index * 2 + 1];
1199 /* Decode 14 samples. */
1200 for (n = 0; n < 14; n++) {
1202 if(n&1) sampledat = sign_extend(*src++, 4);
1203 else sampledat = sign_extend(*src >> 4, 4);
1205 sampledat = ((prev[ch][0]*factor1
1206 + prev[ch][1]*factor2) >> 11) + (sampledat << exp);
1207 *samples = av_clip_int16(sampledat);
1208 prev[ch][1] = prev[ch][0];
1209 prev[ch][0] = *samples++;
1211 /* In case of stereo, skip one sample, this sample
1212 is for the other channel. */
1225 *(AVFrame *)data = c->frame;
1231 #define ADPCM_DECODER(id_, name_, long_name_) \
1232 AVCodec ff_ ## name_ ## _decoder = { \
1234 .type = AVMEDIA_TYPE_AUDIO, \
1236 .priv_data_size = sizeof(ADPCMDecodeContext), \
1237 .init = adpcm_decode_init, \
1238 .decode = adpcm_decode_frame, \
1239 .capabilities = CODEC_CAP_DR1, \
1240 .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
1243 /* Note: Do not forget to add new entries to the Makefile as well. */
1244 ADPCM_DECODER(CODEC_ID_ADPCM_4XM, adpcm_4xm, "ADPCM 4X Movie");
1245 ADPCM_DECODER(CODEC_ID_ADPCM_CT, adpcm_ct, "ADPCM Creative Technology");
1246 ADPCM_DECODER(CODEC_ID_ADPCM_EA, adpcm_ea, "ADPCM Electronic Arts");
1247 ADPCM_DECODER(CODEC_ID_ADPCM_EA_MAXIS_XA, adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");
1248 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R1, adpcm_ea_r1, "ADPCM Electronic Arts R1");
1249 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R2, adpcm_ea_r2, "ADPCM Electronic Arts R2");
1250 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R3, adpcm_ea_r3, "ADPCM Electronic Arts R3");
1251 ADPCM_DECODER(CODEC_ID_ADPCM_EA_XAS, adpcm_ea_xas, "ADPCM Electronic Arts XAS");
1252 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_AMV, adpcm_ima_amv, "ADPCM IMA AMV");
1253 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_APC, adpcm_ima_apc, "ADPCM IMA CRYO APC");
1254 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3, "ADPCM IMA Duck DK3");
1255 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4, "ADPCM IMA Duck DK4");
1256 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_EACS, adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");
1257 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");
1258 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_ISS, adpcm_ima_iss, "ADPCM IMA Funcom ISS");
1259 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt, "ADPCM IMA QuickTime");
1260 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg, "ADPCM IMA Loki SDL MJPEG");
1261 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, "ADPCM IMA WAV");
1262 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws, "ADPCM IMA Westwood");
1263 ADPCM_DECODER(CODEC_ID_ADPCM_MS, adpcm_ms, "ADPCM Microsoft");
1264 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2, "ADPCM Sound Blaster Pro 2-bit");
1265 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3, "ADPCM Sound Blaster Pro 2.6-bit");
1266 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4, "ADPCM Sound Blaster Pro 4-bit");
1267 ADPCM_DECODER(CODEC_ID_ADPCM_SWF, adpcm_swf, "ADPCM Shockwave Flash");
1268 ADPCM_DECODER(CODEC_ID_ADPCM_THP, adpcm_thp, "ADPCM Nintendo Gamecube THP");
1269 ADPCM_DECODER(CODEC_ID_ADPCM_XA, adpcm_xa, "ADPCM CDROM XA");
1270 ADPCM_DECODER(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha, "ADPCM Yamaha");