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 {
87 ADPCMChannelStatus status[6];
90 static av_cold int adpcm_decode_init(AVCodecContext * avctx)
92 ADPCMDecodeContext *c = avctx->priv_data;
93 unsigned int max_channels = 2;
95 switch(avctx->codec->id) {
96 case CODEC_ID_ADPCM_EA_R1:
97 case CODEC_ID_ADPCM_EA_R2:
98 case CODEC_ID_ADPCM_EA_R3:
99 case CODEC_ID_ADPCM_EA_XAS:
103 if(avctx->channels > max_channels){
107 switch(avctx->codec->id) {
108 case CODEC_ID_ADPCM_CT:
109 c->status[0].step = c->status[1].step = 511;
111 case CODEC_ID_ADPCM_IMA_WAV:
112 if (avctx->bits_per_coded_sample != 4) {
113 av_log(avctx, AV_LOG_ERROR, "Only 4-bit ADPCM IMA WAV files are supported\n");
117 case CODEC_ID_ADPCM_IMA_WS:
118 if (avctx->extradata && avctx->extradata_size == 2 * 4) {
119 c->status[0].predictor = AV_RL32(avctx->extradata);
120 c->status[1].predictor = AV_RL32(avctx->extradata + 4);
126 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
130 static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)
134 int sign, delta, diff, step;
136 step = ff_adpcm_step_table[c->step_index];
137 step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];
138 if (step_index < 0) step_index = 0;
139 else if (step_index > 88) step_index = 88;
143 /* perform direct multiplication instead of series of jumps proposed by
144 * the reference ADPCM implementation since modern CPUs can do the mults
146 diff = ((2 * delta + 1) * step) >> shift;
147 predictor = c->predictor;
148 if (sign) predictor -= diff;
149 else predictor += diff;
151 c->predictor = av_clip_int16(predictor);
152 c->step_index = step_index;
154 return (short)c->predictor;
157 static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble, int shift)
163 step = ff_adpcm_step_table[c->step_index];
164 step_index = c->step_index + ff_adpcm_index_table[nibble];
165 step_index = av_clip(step_index, 0, 88);
168 if (nibble & 4) diff += step;
169 if (nibble & 2) diff += step >> 1;
170 if (nibble & 1) diff += step >> 2;
173 predictor = c->predictor - diff;
175 predictor = c->predictor + diff;
177 c->predictor = av_clip_int16(predictor);
178 c->step_index = step_index;
183 static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
187 predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;
188 predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
190 c->sample2 = c->sample1;
191 c->sample1 = av_clip_int16(predictor);
192 c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;
193 if (c->idelta < 16) c->idelta = 16;
198 static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)
200 int sign, delta, diff;
205 /* perform direct multiplication instead of series of jumps proposed by
206 * the reference ADPCM implementation since modern CPUs can do the mults
208 diff = ((2 * delta + 1) * c->step) >> 3;
209 /* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */
210 c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);
211 c->predictor = av_clip_int16(c->predictor);
212 /* calculate new step and clamp it to range 511..32767 */
213 new_step = (ff_adpcm_AdaptationTable[nibble & 7] * c->step) >> 8;
214 c->step = av_clip(new_step, 511, 32767);
216 return (short)c->predictor;
219 static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)
221 int sign, delta, diff;
223 sign = nibble & (1<<(size-1));
224 delta = nibble & ((1<<(size-1))-1);
225 diff = delta << (7 + c->step + shift);
228 c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);
230 /* calculate new step */
231 if (delta >= (2*size - 3) && c->step < 3)
233 else if (delta == 0 && c->step > 0)
236 return (short) c->predictor;
239 static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)
246 c->predictor += (c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8;
247 c->predictor = av_clip_int16(c->predictor);
248 c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;
249 c->step = av_clip(c->step, 127, 24567);
253 static void xa_decode(short *out, const unsigned char *in,
254 ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)
257 int shift,filter,f0,f1;
263 shift = 12 - (in[4+i*2] & 15);
264 filter = in[4+i*2] >> 4;
265 f0 = xa_adpcm_table[filter][0];
266 f1 = xa_adpcm_table[filter][1];
274 t = (signed char)(d<<4)>>4;
275 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
277 s_1 = av_clip_int16(s);
282 if (inc==2) { /* stereo */
285 s_1 = right->sample1;
286 s_2 = right->sample2;
287 out = out + 1 - 28*2;
290 shift = 12 - (in[5+i*2] & 15);
291 filter = in[5+i*2] >> 4;
293 f0 = xa_adpcm_table[filter][0];
294 f1 = xa_adpcm_table[filter][1];
299 t = (signed char)d >> 4;
300 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
302 s_1 = av_clip_int16(s);
307 if (inc==2) { /* stereo */
308 right->sample1 = s_1;
309 right->sample2 = s_2;
319 * Get the number of samples that will be decoded from the packet.
320 * In one case, this is actually the maximum number of samples possible to
321 * decode with the given buf_size.
323 * @param[out] coded_samples set to the number of samples as coded in the
324 * packet, or 0 if the codec does not encode the
325 * number of samples in each frame.
327 static int get_nb_samples(AVCodecContext *avctx, const uint8_t *buf,
328 int buf_size, int *coded_samples)
330 ADPCMDecodeContext *s = avctx->priv_data;
332 int ch = avctx->channels;
333 int has_coded_samples = 0;
338 switch (avctx->codec->id) {
339 /* constant, only check buf_size */
340 case CODEC_ID_ADPCM_EA_XAS:
341 if (buf_size < 76 * ch)
345 case CODEC_ID_ADPCM_IMA_QT:
346 if (buf_size < 34 * ch)
350 /* simple 4-bit adpcm */
351 case CODEC_ID_ADPCM_CT:
352 case CODEC_ID_ADPCM_IMA_EA_SEAD:
353 case CODEC_ID_ADPCM_IMA_WS:
354 case CODEC_ID_ADPCM_YAMAHA:
355 nb_samples = buf_size * 2 / ch;
361 /* simple 4-bit adpcm, with header */
363 switch (avctx->codec->id) {
364 case CODEC_ID_ADPCM_4XM:
365 case CODEC_ID_ADPCM_IMA_ISS: header_size = 4 * ch; break;
366 case CODEC_ID_ADPCM_IMA_AMV: header_size = 8; break;
367 case CODEC_ID_ADPCM_IMA_SMJPEG: header_size = 4; break;
370 return (buf_size - header_size) * 2 / ch;
372 /* more complex formats */
373 switch (avctx->codec->id) {
374 case CODEC_ID_ADPCM_EA:
375 has_coded_samples = 1;
378 *coded_samples = AV_RL32(buf);
379 *coded_samples -= *coded_samples % 28;
380 nb_samples = (buf_size - 12) / 30 * 28;
382 case CODEC_ID_ADPCM_IMA_EA_EACS:
383 has_coded_samples = 1;
386 *coded_samples = AV_RL32(buf);
387 nb_samples = (buf_size - (4 + 8 * ch)) * 2 / ch;
389 case CODEC_ID_ADPCM_EA_MAXIS_XA:
390 nb_samples = ((buf_size - ch) / (2 * ch)) * 2 * ch;
392 case CODEC_ID_ADPCM_EA_R1:
393 case CODEC_ID_ADPCM_EA_R2:
394 case CODEC_ID_ADPCM_EA_R3:
395 /* maximum number of samples */
396 /* has internal offsets and a per-frame switch to signal raw 16-bit */
397 has_coded_samples = 1;
400 switch (avctx->codec->id) {
401 case CODEC_ID_ADPCM_EA_R1:
402 header_size = 4 + 9 * ch;
403 *coded_samples = AV_RL32(buf);
405 case CODEC_ID_ADPCM_EA_R2:
406 header_size = 4 + 5 * ch;
407 *coded_samples = AV_RL32(buf);
409 case CODEC_ID_ADPCM_EA_R3:
410 header_size = 4 + 5 * ch;
411 *coded_samples = AV_RB32(buf);
414 *coded_samples -= *coded_samples % 28;
415 nb_samples = (buf_size - header_size) * 2 / ch;
416 nb_samples -= nb_samples % 28;
418 case CODEC_ID_ADPCM_IMA_DK3:
419 if (avctx->block_align > 0)
420 buf_size = FFMIN(buf_size, avctx->block_align);
421 nb_samples = ((buf_size - 16) * 8 / 3) / ch;
423 case CODEC_ID_ADPCM_IMA_DK4:
424 nb_samples = 1 + (buf_size - 4 * ch) * 2 / ch;
426 case CODEC_ID_ADPCM_IMA_WAV:
427 if (avctx->block_align > 0)
428 buf_size = FFMIN(buf_size, avctx->block_align);
429 nb_samples = 1 + (buf_size - 4 * ch) / (4 * ch) * 8;
431 case CODEC_ID_ADPCM_MS:
432 if (avctx->block_align > 0)
433 buf_size = FFMIN(buf_size, avctx->block_align);
434 nb_samples = 2 + (buf_size - 7 * ch) * 2 / ch;
436 case CODEC_ID_ADPCM_SBPRO_2:
437 case CODEC_ID_ADPCM_SBPRO_3:
438 case CODEC_ID_ADPCM_SBPRO_4:
440 int samples_per_byte;
441 switch (avctx->codec->id) {
442 case CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;
443 case CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;
444 case CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;
446 if (!s->status[0].step_index) {
450 nb_samples += buf_size * samples_per_byte / ch;
453 case CODEC_ID_ADPCM_SWF:
455 int buf_bits = buf_size * 8 - 2;
456 int nbits = (buf[0] >> 6) + 2;
457 int block_hdr_size = 22 * ch;
458 int block_size = block_hdr_size + nbits * ch * 4095;
459 int nblocks = buf_bits / block_size;
460 int bits_left = buf_bits - nblocks * block_size;
461 nb_samples = nblocks * 4096;
462 if (bits_left >= block_hdr_size)
463 nb_samples += 1 + (bits_left - block_hdr_size) / (nbits * ch);
466 case CODEC_ID_ADPCM_THP:
467 has_coded_samples = 1;
470 *coded_samples = AV_RB32(&buf[4]);
471 *coded_samples -= *coded_samples % 14;
472 nb_samples = (buf_size - 80) / (8 * ch) * 14;
474 case CODEC_ID_ADPCM_XA:
475 nb_samples = (buf_size / 128) * 224 / ch;
479 /* validate coded sample count */
480 if (has_coded_samples && (*coded_samples <= 0 || *coded_samples > nb_samples))
481 return AVERROR_INVALIDDATA;
486 /* DK3 ADPCM support macro */
487 #define DK3_GET_NEXT_NIBBLE() \
488 if (decode_top_nibble_next) \
490 nibble = last_byte >> 4; \
491 decode_top_nibble_next = 0; \
497 last_byte = *src++; \
498 if (src >= buf + buf_size) \
500 nibble = last_byte & 0x0F; \
501 decode_top_nibble_next = 1; \
504 static int adpcm_decode_frame(AVCodecContext *avctx,
505 void *data, int *data_size,
508 const uint8_t *buf = avpkt->data;
509 int buf_size = avpkt->size;
510 ADPCMDecodeContext *c = avctx->priv_data;
511 ADPCMChannelStatus *cs;
512 int n, m, channel, i;
517 int nb_samples, coded_samples, out_bps, out_size;
519 nb_samples = get_nb_samples(avctx, buf, buf_size, &coded_samples);
520 if (nb_samples <= 0) {
521 av_log(avctx, AV_LOG_ERROR, "invalid number of samples in packet\n");
522 return AVERROR_INVALIDDATA;
525 out_bps = av_get_bytes_per_sample(avctx->sample_fmt);
526 out_size = nb_samples * avctx->channels * out_bps;
527 if (*data_size < out_size) {
528 av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
529 return AVERROR(EINVAL);
531 /* use coded_samples when applicable */
532 /* it is always <= nb_samples, so the output buffer will be large enough */
534 if (coded_samples != nb_samples)
535 av_log(avctx, AV_LOG_WARNING, "mismatch in coded sample count\n");
536 nb_samples = coded_samples;
537 out_size = nb_samples * avctx->channels * out_bps;
543 st = avctx->channels == 2 ? 1 : 0;
545 switch(avctx->codec->id) {
546 case CODEC_ID_ADPCM_IMA_QT:
547 /* In QuickTime, IMA is encoded by chunks of 34 bytes (=64 samples).
548 Channel data is interleaved per-chunk. */
549 for (channel = 0; channel < avctx->channels; channel++) {
552 cs = &(c->status[channel]);
553 /* (pppppp) (piiiiiii) */
555 /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
556 predictor = AV_RB16(src);
557 step_index = predictor & 0x7F;
562 if (cs->step_index == step_index) {
563 int diff = (int)predictor - cs->predictor;
570 cs->step_index = step_index;
571 cs->predictor = predictor;
574 if (cs->step_index > 88){
575 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
579 samples = (short*)data + channel;
581 for (m = 0; m < 32; m++) {
582 *samples = adpcm_ima_qt_expand_nibble(cs, src[0] & 0x0F, 3);
583 samples += avctx->channels;
584 *samples = adpcm_ima_qt_expand_nibble(cs, src[0] >> 4 , 3);
585 samples += avctx->channels;
590 case CODEC_ID_ADPCM_IMA_WAV:
591 if (avctx->block_align != 0 && buf_size > avctx->block_align)
592 buf_size = avctx->block_align;
594 for(i=0; i<avctx->channels; i++){
595 cs = &(c->status[i]);
596 cs->predictor = *samples++ = (int16_t)bytestream_get_le16(&src);
598 cs->step_index = *src++;
599 if (cs->step_index > 88){
600 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
603 if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null but is %d!!\n", src[-1]); /* unused */
606 for (n = (nb_samples - 1) / 8; n > 0; n--) {
607 for (i = 0; i < avctx->channels; i++) {
609 for (m = 0; m < 4; m++) {
611 *samples = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);
612 samples += avctx->channels;
613 *samples = adpcm_ima_expand_nibble(cs, v >> 4 , 3);
614 samples += avctx->channels;
616 samples -= 8 * avctx->channels - 1;
618 samples += 7 * avctx->channels;
621 case CODEC_ID_ADPCM_4XM:
622 for (i = 0; i < avctx->channels; i++)
623 c->status[i].predictor= (int16_t)bytestream_get_le16(&src);
625 for (i = 0; i < avctx->channels; i++) {
626 c->status[i].step_index= (int16_t)bytestream_get_le16(&src);
627 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
630 for (i = 0; i < avctx->channels; i++) {
631 samples = (short*)data + i;
633 for (n = nb_samples >> 1; n > 0; n--, src++) {
635 *samples = adpcm_ima_expand_nibble(cs, v & 0x0F, 4);
636 samples += avctx->channels;
637 *samples = adpcm_ima_expand_nibble(cs, v >> 4 , 4);
638 samples += avctx->channels;
642 case CODEC_ID_ADPCM_MS:
646 if (avctx->block_align != 0 && buf_size > avctx->block_align)
647 buf_size = avctx->block_align;
649 block_predictor = av_clip(*src++, 0, 6);
650 c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
651 c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
653 block_predictor = av_clip(*src++, 0, 6);
654 c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
655 c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
657 c->status[0].idelta = (int16_t)bytestream_get_le16(&src);
659 c->status[1].idelta = (int16_t)bytestream_get_le16(&src);
662 c->status[0].sample1 = bytestream_get_le16(&src);
663 if (st) c->status[1].sample1 = bytestream_get_le16(&src);
664 c->status[0].sample2 = bytestream_get_le16(&src);
665 if (st) c->status[1].sample2 = bytestream_get_le16(&src);
667 *samples++ = c->status[0].sample2;
668 if (st) *samples++ = c->status[1].sample2;
669 *samples++ = c->status[0].sample1;
670 if (st) *samples++ = c->status[1].sample1;
671 for(n = (nb_samples - 2) >> (1 - st); n > 0; n--, src++) {
672 *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], src[0] >> 4 );
673 *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
677 case CODEC_ID_ADPCM_IMA_DK4:
678 if (avctx->block_align != 0 && buf_size > avctx->block_align)
679 buf_size = avctx->block_align;
681 for (channel = 0; channel < avctx->channels; channel++) {
682 cs = &c->status[channel];
683 cs->predictor = (int16_t)bytestream_get_le16(&src);
684 cs->step_index = *src++;
686 *samples++ = cs->predictor;
688 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
690 *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4 , 3);
691 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
694 case CODEC_ID_ADPCM_IMA_DK3:
696 unsigned char last_byte = 0;
697 unsigned char nibble;
698 int decode_top_nibble_next = 0;
699 int end_of_packet = 0;
702 if (avctx->block_align != 0 && buf_size > avctx->block_align)
703 buf_size = avctx->block_align;
705 c->status[0].predictor = (int16_t)AV_RL16(src + 10);
706 c->status[1].predictor = (int16_t)AV_RL16(src + 12);
707 c->status[0].step_index = src[14];
708 c->status[1].step_index = src[15];
709 /* sign extend the predictors */
711 diff_channel = c->status[1].predictor;
713 /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when
714 * the buffer is consumed */
717 /* for this algorithm, c->status[0] is the sum channel and
718 * c->status[1] is the diff channel */
720 /* process the first predictor of the sum channel */
721 DK3_GET_NEXT_NIBBLE();
722 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
724 /* process the diff channel predictor */
725 DK3_GET_NEXT_NIBBLE();
726 adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
728 /* process the first pair of stereo PCM samples */
729 diff_channel = (diff_channel + c->status[1].predictor) / 2;
730 *samples++ = c->status[0].predictor + c->status[1].predictor;
731 *samples++ = c->status[0].predictor - c->status[1].predictor;
733 /* process the second predictor of the sum channel */
734 DK3_GET_NEXT_NIBBLE();
735 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
737 /* process the second pair of stereo PCM samples */
738 diff_channel = (diff_channel + c->status[1].predictor) / 2;
739 *samples++ = c->status[0].predictor + c->status[1].predictor;
740 *samples++ = c->status[0].predictor - c->status[1].predictor;
744 case CODEC_ID_ADPCM_IMA_ISS:
745 for (channel = 0; channel < avctx->channels; channel++) {
746 cs = &c->status[channel];
747 cs->predictor = (int16_t)bytestream_get_le16(&src);
748 cs->step_index = *src++;
752 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
755 /* nibbles are swapped for mono */
763 *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);
764 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);
767 case CODEC_ID_ADPCM_IMA_WS:
768 while (src < buf + buf_size) {
770 *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4 , 3);
771 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
774 case CODEC_ID_ADPCM_XA:
775 while (buf_size >= 128) {
776 xa_decode(samples, src, &c->status[0], &c->status[1],
783 case CODEC_ID_ADPCM_IMA_EA_EACS:
784 src += 4; // skip sample count (already read)
786 for (i=0; i<=st; i++)
787 c->status[i].step_index = bytestream_get_le32(&src);
788 for (i=0; i<=st; i++)
789 c->status[i].predictor = bytestream_get_le32(&src);
791 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
792 *samples++ = adpcm_ima_expand_nibble(&c->status[0], *src>>4, 3);
793 *samples++ = adpcm_ima_expand_nibble(&c->status[st], *src&0x0F, 3);
796 case CODEC_ID_ADPCM_IMA_EA_SEAD:
797 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
798 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] >> 4, 6);
799 *samples++ = adpcm_ima_expand_nibble(&c->status[st],src[0]&0x0F, 6);
802 case CODEC_ID_ADPCM_EA:
804 int32_t previous_left_sample, previous_right_sample;
805 int32_t current_left_sample, current_right_sample;
806 int32_t next_left_sample, next_right_sample;
807 int32_t coeff1l, coeff2l, coeff1r, coeff2r;
808 uint8_t shift_left, shift_right;
810 /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,
811 each coding 28 stereo samples. */
813 src += 4; // skip sample count (already read)
815 current_left_sample = (int16_t)bytestream_get_le16(&src);
816 previous_left_sample = (int16_t)bytestream_get_le16(&src);
817 current_right_sample = (int16_t)bytestream_get_le16(&src);
818 previous_right_sample = (int16_t)bytestream_get_le16(&src);
820 for (count1 = 0; count1 < nb_samples / 28; count1++) {
821 coeff1l = ea_adpcm_table[ *src >> 4 ];
822 coeff2l = ea_adpcm_table[(*src >> 4 ) + 4];
823 coeff1r = ea_adpcm_table[*src & 0x0F];
824 coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];
827 shift_left = 20 - (*src >> 4);
828 shift_right = 20 - (*src & 0x0F);
831 for (count2 = 0; count2 < 28; count2++) {
832 next_left_sample = sign_extend(*src >> 4, 4) << shift_left;
833 next_right_sample = sign_extend(*src, 4) << shift_right;
836 next_left_sample = (next_left_sample +
837 (current_left_sample * coeff1l) +
838 (previous_left_sample * coeff2l) + 0x80) >> 8;
839 next_right_sample = (next_right_sample +
840 (current_right_sample * coeff1r) +
841 (previous_right_sample * coeff2r) + 0x80) >> 8;
843 previous_left_sample = current_left_sample;
844 current_left_sample = av_clip_int16(next_left_sample);
845 previous_right_sample = current_right_sample;
846 current_right_sample = av_clip_int16(next_right_sample);
847 *samples++ = (unsigned short)current_left_sample;
848 *samples++ = (unsigned short)current_right_sample;
852 if (src - buf == buf_size - 2)
853 src += 2; // Skip terminating 0x0000
857 case CODEC_ID_ADPCM_EA_MAXIS_XA:
859 int coeff[2][2], shift[2];
861 for(channel = 0; channel < avctx->channels; channel++) {
863 coeff[channel][i] = ea_adpcm_table[(*src >> 4) + 4*i];
864 shift[channel] = 20 - (*src & 0x0F);
867 for (count1 = 0; count1 < nb_samples / 2; count1++) {
868 for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */
869 for(channel = 0; channel < avctx->channels; channel++) {
870 int32_t sample = sign_extend(src[channel] >> i, 4) << shift[channel];
872 c->status[channel].sample1 * coeff[channel][0] +
873 c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;
874 c->status[channel].sample2 = c->status[channel].sample1;
875 c->status[channel].sample1 = av_clip_int16(sample);
876 *samples++ = c->status[channel].sample1;
879 src+=avctx->channels;
881 /* consume whole packet */
882 src = buf + buf_size;
885 case CODEC_ID_ADPCM_EA_R1:
886 case CODEC_ID_ADPCM_EA_R2:
887 case CODEC_ID_ADPCM_EA_R3: {
890 4chan: 0=fl, 1=rl, 2=fr, 3=rr
891 6chan: 0=fl, 1=c, 2=fr, 3=rl, 4=rr, 5=sub */
892 const int big_endian = avctx->codec->id == CODEC_ID_ADPCM_EA_R3;
893 int32_t previous_sample, current_sample, next_sample;
894 int32_t coeff1, coeff2;
896 unsigned int channel;
899 const uint8_t *src_end = buf + buf_size;
902 src += 4; // skip sample count (already read)
904 for (channel=0; channel<avctx->channels; channel++) {
905 int32_t offset = (big_endian ? bytestream_get_be32(&src)
906 : bytestream_get_le32(&src))
907 + (avctx->channels-channel-1) * 4;
909 if ((offset < 0) || (offset >= src_end - src - 4)) break;
911 samplesC = samples + channel;
913 if (avctx->codec->id == CODEC_ID_ADPCM_EA_R1) {
914 current_sample = (int16_t)bytestream_get_le16(&srcC);
915 previous_sample = (int16_t)bytestream_get_le16(&srcC);
917 current_sample = c->status[channel].predictor;
918 previous_sample = c->status[channel].prev_sample;
921 for (count1 = 0; count1 < nb_samples / 28; count1++) {
922 if (*srcC == 0xEE) { /* only seen in R2 and R3 */
924 if (srcC > src_end - 30*2) break;
925 current_sample = (int16_t)bytestream_get_be16(&srcC);
926 previous_sample = (int16_t)bytestream_get_be16(&srcC);
928 for (count2=0; count2<28; count2++) {
929 *samplesC = (int16_t)bytestream_get_be16(&srcC);
930 samplesC += avctx->channels;
933 coeff1 = ea_adpcm_table[ *srcC>>4 ];
934 coeff2 = ea_adpcm_table[(*srcC>>4) + 4];
935 shift = 20 - (*srcC++ & 0x0F);
937 if (srcC > src_end - 14) break;
938 for (count2=0; count2<28; count2++) {
940 next_sample = sign_extend(*srcC++, 4) << shift;
942 next_sample = sign_extend(*srcC >> 4, 4) << shift;
944 next_sample += (current_sample * coeff1) +
945 (previous_sample * coeff2);
946 next_sample = av_clip_int16(next_sample >> 8);
948 previous_sample = current_sample;
949 current_sample = next_sample;
950 *samplesC = current_sample;
951 samplesC += avctx->channels;
957 } else if (count != count1) {
958 av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");
959 count = FFMAX(count, count1);
962 if (avctx->codec->id != CODEC_ID_ADPCM_EA_R1) {
963 c->status[channel].predictor = current_sample;
964 c->status[channel].prev_sample = previous_sample;
968 out_size = count * 28 * avctx->channels * out_bps;
972 case CODEC_ID_ADPCM_EA_XAS:
973 for (channel=0; channel<avctx->channels; channel++) {
974 int coeff[2][4], shift[4];
975 short *s2, *s = &samples[channel];
976 for (n=0; n<4; n++, s+=32*avctx->channels) {
978 coeff[i][n] = ea_adpcm_table[(src[0]&0x0F)+4*i];
979 shift[n] = 20 - (src[2] & 0x0F);
980 for (s2=s, i=0; i<2; i++, src+=2, s2+=avctx->channels)
981 s2[0] = (src[0]&0xF0) + (src[1]<<8);
984 for (m=2; m<32; m+=2) {
985 s = &samples[m*avctx->channels + channel];
986 for (n=0; n<4; n++, src++, s+=32*avctx->channels) {
987 for (s2=s, i=0; i<8; i+=4, s2+=avctx->channels) {
988 int level = sign_extend(*src >> (4 - i), 4) << shift[n];
989 int pred = s2[-1*avctx->channels] * coeff[0][n]
990 + s2[-2*avctx->channels] * coeff[1][n];
991 s2[0] = av_clip_int16((level + pred + 0x80) >> 8);
997 case CODEC_ID_ADPCM_IMA_AMV:
998 case CODEC_ID_ADPCM_IMA_SMJPEG:
999 c->status[0].predictor = (int16_t)bytestream_get_le16(&src);
1000 c->status[0].step_index = bytestream_get_le16(&src);
1002 if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
1005 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
1010 if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
1011 FFSWAP(char, hi, lo);
1013 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1015 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1019 case CODEC_ID_ADPCM_CT:
1020 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
1022 *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4 );
1023 *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);
1026 case CODEC_ID_ADPCM_SBPRO_4:
1027 case CODEC_ID_ADPCM_SBPRO_3:
1028 case CODEC_ID_ADPCM_SBPRO_2:
1029 if (!c->status[0].step_index) {
1030 /* the first byte is a raw sample */
1031 *samples++ = 128 * (*src++ - 0x80);
1033 *samples++ = 128 * (*src++ - 0x80);
1034 c->status[0].step_index = 1;
1037 if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {
1038 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
1039 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1041 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1042 src[0] & 0x0F, 4, 0);
1044 } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {
1045 for (n = nb_samples / 3; n > 0; n--, src++) {
1046 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1047 src[0] >> 5 , 3, 0);
1048 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1049 (src[0] >> 2) & 0x07, 3, 0);
1050 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1051 src[0] & 0x03, 2, 0);
1054 for (n = nb_samples >> (2 - st); n > 0; n--, src++) {
1055 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1056 src[0] >> 6 , 2, 2);
1057 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1058 (src[0] >> 4) & 0x03, 2, 2);
1059 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1060 (src[0] >> 2) & 0x03, 2, 2);
1061 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1062 src[0] & 0x03, 2, 2);
1066 case CODEC_ID_ADPCM_SWF:
1070 int k0, signmask, nb_bits, count;
1071 int size = buf_size*8;
1073 init_get_bits(&gb, buf, size);
1075 //read bits & initial values
1076 nb_bits = get_bits(&gb, 2)+2;
1077 //av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits);
1078 table = swf_index_tables[nb_bits-2];
1079 k0 = 1 << (nb_bits-2);
1080 signmask = 1 << (nb_bits-1);
1082 while (get_bits_count(&gb) <= size - 22*avctx->channels) {
1083 for (i = 0; i < avctx->channels; i++) {
1084 *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
1085 c->status[i].step_index = get_bits(&gb, 6);
1088 for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {
1091 for (i = 0; i < avctx->channels; i++) {
1092 // similar to IMA adpcm
1093 int delta = get_bits(&gb, nb_bits);
1094 int step = ff_adpcm_step_table[c->status[i].step_index];
1095 long vpdiff = 0; // vpdiff = (delta+0.5)*step/4
1106 if (delta & signmask)
1107 c->status[i].predictor -= vpdiff;
1109 c->status[i].predictor += vpdiff;
1111 c->status[i].step_index += table[delta & (~signmask)];
1113 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
1114 c->status[i].predictor = av_clip_int16(c->status[i].predictor);
1116 *samples++ = c->status[i].predictor;
1123 case CODEC_ID_ADPCM_YAMAHA:
1124 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
1126 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);
1127 *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4 );
1130 case CODEC_ID_ADPCM_THP:
1136 src += 4; // skip channel size
1137 src += 4; // skip number of samples (already read)
1139 for (i = 0; i < 32; i++)
1140 table[0][i] = (int16_t)bytestream_get_be16(&src);
1142 /* Initialize the previous sample. */
1143 for (i = 0; i < 4; i++)
1144 prev[0][i] = (int16_t)bytestream_get_be16(&src);
1146 for (ch = 0; ch <= st; ch++) {
1147 samples = (unsigned short *) data + ch;
1149 /* Read in every sample for this channel. */
1150 for (i = 0; i < nb_samples / 14; i++) {
1151 int index = (*src >> 4) & 7;
1152 unsigned int exp = *src++ & 15;
1153 int factor1 = table[ch][index * 2];
1154 int factor2 = table[ch][index * 2 + 1];
1156 /* Decode 14 samples. */
1157 for (n = 0; n < 14; n++) {
1159 if(n&1) sampledat = sign_extend(*src++, 4);
1160 else sampledat = sign_extend(*src >> 4, 4);
1162 sampledat = ((prev[ch][0]*factor1
1163 + prev[ch][1]*factor2) >> 11) + (sampledat << exp);
1164 *samples = av_clip_int16(sampledat);
1165 prev[ch][1] = prev[ch][0];
1166 prev[ch][0] = *samples++;
1168 /* In case of stereo, skip one sample, this sample
1169 is for the other channel. */
1180 *data_size = out_size;
1185 #define ADPCM_DECODER(id_, name_, long_name_) \
1186 AVCodec ff_ ## name_ ## _decoder = { \
1188 .type = AVMEDIA_TYPE_AUDIO, \
1190 .priv_data_size = sizeof(ADPCMDecodeContext), \
1191 .init = adpcm_decode_init, \
1192 .decode = adpcm_decode_frame, \
1193 .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
1196 /* Note: Do not forget to add new entries to the Makefile as well. */
1197 ADPCM_DECODER(CODEC_ID_ADPCM_4XM, adpcm_4xm, "ADPCM 4X Movie");
1198 ADPCM_DECODER(CODEC_ID_ADPCM_CT, adpcm_ct, "ADPCM Creative Technology");
1199 ADPCM_DECODER(CODEC_ID_ADPCM_EA, adpcm_ea, "ADPCM Electronic Arts");
1200 ADPCM_DECODER(CODEC_ID_ADPCM_EA_MAXIS_XA, adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");
1201 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R1, adpcm_ea_r1, "ADPCM Electronic Arts R1");
1202 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R2, adpcm_ea_r2, "ADPCM Electronic Arts R2");
1203 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R3, adpcm_ea_r3, "ADPCM Electronic Arts R3");
1204 ADPCM_DECODER(CODEC_ID_ADPCM_EA_XAS, adpcm_ea_xas, "ADPCM Electronic Arts XAS");
1205 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_AMV, adpcm_ima_amv, "ADPCM IMA AMV");
1206 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3, "ADPCM IMA Duck DK3");
1207 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4, "ADPCM IMA Duck DK4");
1208 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_EACS, adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");
1209 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");
1210 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_ISS, adpcm_ima_iss, "ADPCM IMA Funcom ISS");
1211 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt, "ADPCM IMA QuickTime");
1212 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg, "ADPCM IMA Loki SDL MJPEG");
1213 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, "ADPCM IMA WAV");
1214 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws, "ADPCM IMA Westwood");
1215 ADPCM_DECODER(CODEC_ID_ADPCM_MS, adpcm_ms, "ADPCM Microsoft");
1216 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2, "ADPCM Sound Blaster Pro 2-bit");
1217 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3, "ADPCM Sound Blaster Pro 2.6-bit");
1218 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4, "ADPCM Sound Blaster Pro 4-bit");
1219 ADPCM_DECODER(CODEC_ID_ADPCM_SWF, adpcm_swf, "ADPCM Shockwave Flash");
1220 ADPCM_DECODER(CODEC_ID_ADPCM_THP, adpcm_thp, "ADPCM Nintendo Gamecube THP");
1221 ADPCM_DECODER(CODEC_ID_ADPCM_XA, adpcm_xa, "ADPCM CDROM XA");
1222 ADPCM_DECODER(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha, "ADPCM Yamaha");