2 * Copyright (c) 2001-2003 The ffmpeg Project
4 * This file is part of FFmpeg.
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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://www.pcisys.net/~melanson/codecs/simpleaudio.html
46 * http://www.geocities.com/SiliconValley/8682/aud3.txt
47 * http://openquicktime.sourceforge.net/plugins.htm
48 * XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html
49 * http://www.cs.ucla.edu/~leec/mediabench/applications.html
50 * SoX source code http://home.sprynet.com/~cbagwell/sox.html
53 * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html
54 * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html
55 * readstr http://www.geocities.co.jp/Playtown/2004/
58 /* These are for CD-ROM XA ADPCM */
59 static const int xa_adpcm_table[5][2] = {
67 static const int ea_adpcm_table[] = {
68 0, 240, 460, 392, 0, 0, -208, -220, 0, 1,
69 3, 4, 7, 8, 10, 11, 0, -1, -3, -4
72 // padded to zero where table size is less then 16
73 static const int swf_index_tables[4][16] = {
75 /*3*/ { -1, -1, 2, 4 },
76 /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },
77 /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }
82 typedef struct ADPCMDecodeContext {
83 ADPCMChannelStatus status[6];
86 static av_cold int adpcm_decode_init(AVCodecContext * avctx)
88 ADPCMDecodeContext *c = avctx->priv_data;
89 unsigned int max_channels = 2;
91 switch(avctx->codec->id) {
92 case CODEC_ID_ADPCM_EA_R1:
93 case CODEC_ID_ADPCM_EA_R2:
94 case CODEC_ID_ADPCM_EA_R3:
95 case CODEC_ID_ADPCM_EA_XAS:
99 if(avctx->channels > max_channels){
103 switch(avctx->codec->id) {
104 case CODEC_ID_ADPCM_CT:
105 c->status[0].step = c->status[1].step = 511;
107 case CODEC_ID_ADPCM_IMA_WAV:
108 if (avctx->bits_per_coded_sample != 4) {
109 av_log(avctx, AV_LOG_ERROR, "Only 4-bit ADPCM IMA WAV files are supported\n");
113 case CODEC_ID_ADPCM_IMA_WS:
114 if (avctx->extradata && avctx->extradata_size == 2 * 4) {
115 c->status[0].predictor = AV_RL32(avctx->extradata);
116 c->status[1].predictor = AV_RL32(avctx->extradata + 4);
122 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
126 static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)
130 int sign, delta, diff, step;
132 step = ff_adpcm_step_table[c->step_index];
133 step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];
134 if (step_index < 0) step_index = 0;
135 else if (step_index > 88) step_index = 88;
139 /* perform direct multiplication instead of series of jumps proposed by
140 * the reference ADPCM implementation since modern CPUs can do the mults
142 diff = ((2 * delta + 1) * step) >> shift;
143 predictor = c->predictor;
144 if (sign) predictor -= diff;
145 else predictor += diff;
147 c->predictor = av_clip_int16(predictor);
148 c->step_index = step_index;
150 return (short)c->predictor;
153 static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble, int shift)
159 step = ff_adpcm_step_table[c->step_index];
160 step_index = c->step_index + ff_adpcm_index_table[nibble];
161 step_index = av_clip(step_index, 0, 88);
164 if (nibble & 4) diff += step;
165 if (nibble & 2) diff += step >> 1;
166 if (nibble & 1) diff += step >> 2;
169 predictor = c->predictor - diff;
171 predictor = c->predictor + diff;
173 c->predictor = av_clip_int16(predictor);
174 c->step_index = step_index;
179 static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
183 predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;
184 predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
186 c->sample2 = c->sample1;
187 c->sample1 = av_clip_int16(predictor);
188 c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;
189 if (c->idelta < 16) c->idelta = 16;
194 static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)
196 int sign, delta, diff;
201 /* perform direct multiplication instead of series of jumps proposed by
202 * the reference ADPCM implementation since modern CPUs can do the mults
204 diff = ((2 * delta + 1) * c->step) >> 3;
205 /* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */
206 c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);
207 c->predictor = av_clip_int16(c->predictor);
208 /* calculate new step and clamp it to range 511..32767 */
209 new_step = (ff_adpcm_AdaptationTable[nibble & 7] * c->step) >> 8;
210 c->step = av_clip(new_step, 511, 32767);
212 return (short)c->predictor;
215 static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)
217 int sign, delta, diff;
219 sign = nibble & (1<<(size-1));
220 delta = nibble & ((1<<(size-1))-1);
221 diff = delta << (7 + c->step + shift);
224 c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);
226 /* calculate new step */
227 if (delta >= (2*size - 3) && c->step < 3)
229 else if (delta == 0 && c->step > 0)
232 return (short) c->predictor;
235 static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)
242 c->predictor += (c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8;
243 c->predictor = av_clip_int16(c->predictor);
244 c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;
245 c->step = av_clip(c->step, 127, 24567);
249 static void xa_decode(short *out, const unsigned char *in,
250 ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)
253 int shift,filter,f0,f1;
259 shift = 12 - (in[4+i*2] & 15);
260 filter = in[4+i*2] >> 4;
261 f0 = xa_adpcm_table[filter][0];
262 f1 = xa_adpcm_table[filter][1];
270 t = (signed char)(d<<4)>>4;
271 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
273 s_1 = av_clip_int16(s);
278 if (inc==2) { /* stereo */
281 s_1 = right->sample1;
282 s_2 = right->sample2;
283 out = out + 1 - 28*2;
286 shift = 12 - (in[5+i*2] & 15);
287 filter = in[5+i*2] >> 4;
289 f0 = xa_adpcm_table[filter][0];
290 f1 = xa_adpcm_table[filter][1];
295 t = (signed char)d >> 4;
296 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
298 s_1 = av_clip_int16(s);
303 if (inc==2) { /* stereo */
304 right->sample1 = s_1;
305 right->sample2 = s_2;
315 /* DK3 ADPCM support macro */
316 #define DK3_GET_NEXT_NIBBLE() \
317 if (decode_top_nibble_next) \
319 nibble = last_byte >> 4; \
320 decode_top_nibble_next = 0; \
324 last_byte = *src++; \
325 if (src >= buf + buf_size) break; \
326 nibble = last_byte & 0x0F; \
327 decode_top_nibble_next = 1; \
330 static int adpcm_decode_frame(AVCodecContext *avctx,
331 void *data, int *data_size,
334 const uint8_t *buf = avpkt->data;
335 int buf_size = avpkt->size;
336 ADPCMDecodeContext *c = avctx->priv_data;
337 ADPCMChannelStatus *cs;
338 int n, m, channel, i;
339 int block_predictor[2];
345 /* DK3 ADPCM accounting variables */
346 unsigned char last_byte = 0;
347 unsigned char nibble;
348 int decode_top_nibble_next = 0;
351 /* EA ADPCM state variables */
352 uint32_t samples_in_chunk;
353 int32_t previous_left_sample, previous_right_sample;
354 int32_t current_left_sample, current_right_sample;
355 int32_t next_left_sample, next_right_sample;
356 int32_t coeff1l, coeff2l, coeff1r, coeff2r;
357 uint8_t shift_left, shift_right;
359 int coeff[2][2], shift[2];//used in EA MAXIS ADPCM
364 //should protect all 4bit ADPCM variants
365 //8 is needed for CODEC_ID_ADPCM_IMA_WAV with 2 channels
367 if(*data_size/4 < buf_size + 8)
371 samples_end= samples + *data_size/2;
375 st = avctx->channels == 2 ? 1 : 0;
377 switch(avctx->codec->id) {
378 case CODEC_ID_ADPCM_IMA_QT:
379 n = buf_size - 2*avctx->channels;
380 for (channel = 0; channel < avctx->channels; channel++) {
383 cs = &(c->status[channel]);
384 /* (pppppp) (piiiiiii) */
386 /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
387 predictor = AV_RB16(src);
388 step_index = predictor & 0x7F;
393 if (cs->step_index == step_index) {
394 int diff = (int)predictor - cs->predictor;
401 cs->step_index = step_index;
402 cs->predictor = predictor;
405 if (cs->step_index > 88){
406 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
410 samples = (short*)data + channel;
412 for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */
413 *samples = adpcm_ima_qt_expand_nibble(cs, src[0] & 0x0F, 3);
414 samples += avctx->channels;
415 *samples = adpcm_ima_qt_expand_nibble(cs, src[0] >> 4 , 3);
416 samples += avctx->channels;
423 case CODEC_ID_ADPCM_IMA_WAV:
424 if (avctx->block_align != 0 && buf_size > avctx->block_align)
425 buf_size = avctx->block_align;
427 // samples_per_block= (block_align-4*chanels)*8 / (bits_per_sample * chanels) + 1;
429 for(i=0; i<avctx->channels; i++){
430 cs = &(c->status[i]);
431 cs->predictor = *samples++ = (int16_t)bytestream_get_le16(&src);
433 cs->step_index = *src++;
434 if (cs->step_index > 88){
435 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
438 if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null but is %d!!\n", src[-1]); /* unused */
441 while(src < buf + buf_size){
444 *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] & 0x0F, 3);
446 *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] >> 4 , 3);
452 case CODEC_ID_ADPCM_4XM:
453 cs = &(c->status[0]);
454 c->status[0].predictor= (int16_t)bytestream_get_le16(&src);
456 c->status[1].predictor= (int16_t)bytestream_get_le16(&src);
458 c->status[0].step_index= (int16_t)bytestream_get_le16(&src);
460 c->status[1].step_index= (int16_t)bytestream_get_le16(&src);
462 if (cs->step_index < 0) cs->step_index = 0;
463 if (cs->step_index > 88) cs->step_index = 88;
465 m= (buf_size - (src - buf))>>st;
467 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] & 0x0F, 4);
469 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] & 0x0F, 4);
470 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] >> 4, 4);
472 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] >> 4, 4);
478 case CODEC_ID_ADPCM_MS:
479 if (avctx->block_align != 0 && buf_size > avctx->block_align)
480 buf_size = avctx->block_align;
481 n = buf_size - 7 * avctx->channels;
484 block_predictor[0] = av_clip(*src++, 0, 6);
485 block_predictor[1] = 0;
487 block_predictor[1] = av_clip(*src++, 0, 6);
488 c->status[0].idelta = (int16_t)bytestream_get_le16(&src);
490 c->status[1].idelta = (int16_t)bytestream_get_le16(&src);
492 c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor[0]];
493 c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor[0]];
494 c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor[1]];
495 c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor[1]];
497 c->status[0].sample1 = bytestream_get_le16(&src);
498 if (st) c->status[1].sample1 = bytestream_get_le16(&src);
499 c->status[0].sample2 = bytestream_get_le16(&src);
500 if (st) c->status[1].sample2 = bytestream_get_le16(&src);
502 *samples++ = c->status[0].sample2;
503 if (st) *samples++ = c->status[1].sample2;
504 *samples++ = c->status[0].sample1;
505 if (st) *samples++ = c->status[1].sample1;
507 *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], src[0] >> 4 );
508 *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
512 case CODEC_ID_ADPCM_IMA_DK4:
513 if (avctx->block_align != 0 && buf_size > avctx->block_align)
514 buf_size = avctx->block_align;
516 c->status[0].predictor = (int16_t)bytestream_get_le16(&src);
517 c->status[0].step_index = *src++;
519 *samples++ = c->status[0].predictor;
521 c->status[1].predictor = (int16_t)bytestream_get_le16(&src);
522 c->status[1].step_index = *src++;
524 *samples++ = c->status[1].predictor;
526 while (src < buf + buf_size) {
528 /* take care of the top nibble (always left or mono channel) */
529 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
532 /* take care of the bottom nibble, which is right sample for
533 * stereo, or another mono sample */
535 *samples++ = adpcm_ima_expand_nibble(&c->status[1],
538 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
544 case CODEC_ID_ADPCM_IMA_DK3:
545 if (avctx->block_align != 0 && buf_size > avctx->block_align)
546 buf_size = avctx->block_align;
548 if(buf_size + 16 > (samples_end - samples)*3/8)
551 c->status[0].predictor = (int16_t)AV_RL16(src + 10);
552 c->status[1].predictor = (int16_t)AV_RL16(src + 12);
553 c->status[0].step_index = src[14];
554 c->status[1].step_index = src[15];
555 /* sign extend the predictors */
557 diff_channel = c->status[1].predictor;
559 /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when
560 * the buffer is consumed */
563 /* for this algorithm, c->status[0] is the sum channel and
564 * c->status[1] is the diff channel */
566 /* process the first predictor of the sum channel */
567 DK3_GET_NEXT_NIBBLE();
568 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
570 /* process the diff channel predictor */
571 DK3_GET_NEXT_NIBBLE();
572 adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
574 /* process the first pair of stereo PCM samples */
575 diff_channel = (diff_channel + c->status[1].predictor) / 2;
576 *samples++ = c->status[0].predictor + c->status[1].predictor;
577 *samples++ = c->status[0].predictor - c->status[1].predictor;
579 /* process the second predictor of the sum channel */
580 DK3_GET_NEXT_NIBBLE();
581 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
583 /* process the second pair of stereo PCM samples */
584 diff_channel = (diff_channel + c->status[1].predictor) / 2;
585 *samples++ = c->status[0].predictor + c->status[1].predictor;
586 *samples++ = c->status[0].predictor - c->status[1].predictor;
589 case CODEC_ID_ADPCM_IMA_ISS:
590 c->status[0].predictor = (int16_t)AV_RL16(src + 0);
591 c->status[0].step_index = src[2];
594 c->status[1].predictor = (int16_t)AV_RL16(src + 0);
595 c->status[1].step_index = src[2];
599 while (src < buf + buf_size) {
602 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
604 *samples++ = adpcm_ima_expand_nibble(&c->status[1],
607 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
609 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
616 case CODEC_ID_ADPCM_IMA_WS:
617 /* no per-block initialization; just start decoding the data */
618 while (src < buf + buf_size) {
621 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
623 *samples++ = adpcm_ima_expand_nibble(&c->status[1],
626 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
628 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
635 case CODEC_ID_ADPCM_XA:
636 while (buf_size >= 128) {
637 xa_decode(samples, src, &c->status[0], &c->status[1],
644 case CODEC_ID_ADPCM_IMA_EA_EACS:
645 samples_in_chunk = bytestream_get_le32(&src) >> (1-st);
647 if (samples_in_chunk > buf_size-4-(8<<st)) {
652 for (i=0; i<=st; i++)
653 c->status[i].step_index = bytestream_get_le32(&src);
654 for (i=0; i<=st; i++)
655 c->status[i].predictor = bytestream_get_le32(&src);
657 for (; samples_in_chunk; samples_in_chunk--, src++) {
658 *samples++ = adpcm_ima_expand_nibble(&c->status[0], *src>>4, 3);
659 *samples++ = adpcm_ima_expand_nibble(&c->status[st], *src&0x0F, 3);
662 case CODEC_ID_ADPCM_IMA_EA_SEAD:
663 for (; src < buf+buf_size; src++) {
664 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] >> 4, 6);
665 *samples++ = adpcm_ima_expand_nibble(&c->status[st],src[0]&0x0F, 6);
668 case CODEC_ID_ADPCM_EA:
669 /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,
670 each coding 28 stereo samples. */
672 av_log(avctx, AV_LOG_ERROR, "frame too small\n");
673 return AVERROR(EINVAL);
675 samples_in_chunk = AV_RL32(src);
676 if (samples_in_chunk / 28 > (buf_size - 12) / 30) {
677 av_log(avctx, AV_LOG_ERROR, "invalid frame\n");
678 return AVERROR(EINVAL);
681 current_left_sample = (int16_t)bytestream_get_le16(&src);
682 previous_left_sample = (int16_t)bytestream_get_le16(&src);
683 current_right_sample = (int16_t)bytestream_get_le16(&src);
684 previous_right_sample = (int16_t)bytestream_get_le16(&src);
686 for (count1 = 0; count1 < samples_in_chunk/28;count1++) {
687 coeff1l = ea_adpcm_table[ *src >> 4 ];
688 coeff2l = ea_adpcm_table[(*src >> 4 ) + 4];
689 coeff1r = ea_adpcm_table[*src & 0x0F];
690 coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];
693 shift_left = (*src >> 4 ) + 8;
694 shift_right = (*src & 0x0F) + 8;
697 for (count2 = 0; count2 < 28; count2++) {
698 next_left_sample = (int32_t)((*src & 0xF0) << 24) >> shift_left;
699 next_right_sample = (int32_t)((*src & 0x0F) << 28) >> shift_right;
702 next_left_sample = (next_left_sample +
703 (current_left_sample * coeff1l) +
704 (previous_left_sample * coeff2l) + 0x80) >> 8;
705 next_right_sample = (next_right_sample +
706 (current_right_sample * coeff1r) +
707 (previous_right_sample * coeff2r) + 0x80) >> 8;
709 previous_left_sample = current_left_sample;
710 current_left_sample = av_clip_int16(next_left_sample);
711 previous_right_sample = current_right_sample;
712 current_right_sample = av_clip_int16(next_right_sample);
713 *samples++ = (unsigned short)current_left_sample;
714 *samples++ = (unsigned short)current_right_sample;
718 if (src - buf == buf_size - 2)
719 src += 2; // Skip terminating 0x0000
722 case CODEC_ID_ADPCM_EA_MAXIS_XA:
723 for(channel = 0; channel < avctx->channels; channel++) {
725 coeff[channel][i] = ea_adpcm_table[(*src >> 4) + 4*i];
726 shift[channel] = (*src & 0x0F) + 8;
729 for (count1 = 0; count1 < (buf_size - avctx->channels) / avctx->channels; count1++) {
730 for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */
731 for(channel = 0; channel < avctx->channels; channel++) {
732 int32_t sample = (int32_t)(((*(src+channel) >> i) & 0x0F) << 0x1C) >> shift[channel];
734 c->status[channel].sample1 * coeff[channel][0] +
735 c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;
736 c->status[channel].sample2 = c->status[channel].sample1;
737 c->status[channel].sample1 = av_clip_int16(sample);
738 *samples++ = c->status[channel].sample1;
741 src+=avctx->channels;
744 case CODEC_ID_ADPCM_EA_R1:
745 case CODEC_ID_ADPCM_EA_R2:
746 case CODEC_ID_ADPCM_EA_R3: {
749 4chan: 0=fl, 1=rl, 2=fr, 3=rr
750 6chan: 0=fl, 1=c, 2=fr, 3=rl, 4=rr, 5=sub */
751 const int big_endian = avctx->codec->id == CODEC_ID_ADPCM_EA_R3;
752 int32_t previous_sample, current_sample, next_sample;
753 int32_t coeff1, coeff2;
755 unsigned int channel;
758 const uint8_t *src_end = buf + buf_size;
760 samples_in_chunk = (big_endian ? bytestream_get_be32(&src)
761 : bytestream_get_le32(&src)) / 28;
762 if (samples_in_chunk > UINT32_MAX/(28*avctx->channels) ||
763 28*samples_in_chunk*avctx->channels > samples_end-samples) {
768 for (channel=0; channel<avctx->channels; channel++) {
769 int32_t offset = (big_endian ? bytestream_get_be32(&src)
770 : bytestream_get_le32(&src))
771 + (avctx->channels-channel-1) * 4;
773 if ((offset < 0) || (offset >= src_end - src - 4)) break;
775 samplesC = samples + channel;
777 if (avctx->codec->id == CODEC_ID_ADPCM_EA_R1) {
778 current_sample = (int16_t)bytestream_get_le16(&srcC);
779 previous_sample = (int16_t)bytestream_get_le16(&srcC);
781 current_sample = c->status[channel].predictor;
782 previous_sample = c->status[channel].prev_sample;
785 for (count1=0; count1<samples_in_chunk; count1++) {
786 if (*srcC == 0xEE) { /* only seen in R2 and R3 */
788 if (srcC > src_end - 30*2) break;
789 current_sample = (int16_t)bytestream_get_be16(&srcC);
790 previous_sample = (int16_t)bytestream_get_be16(&srcC);
792 for (count2=0; count2<28; count2++) {
793 *samplesC = (int16_t)bytestream_get_be16(&srcC);
794 samplesC += avctx->channels;
797 coeff1 = ea_adpcm_table[ *srcC>>4 ];
798 coeff2 = ea_adpcm_table[(*srcC>>4) + 4];
799 shift = (*srcC++ & 0x0F) + 8;
801 if (srcC > src_end - 14) break;
802 for (count2=0; count2<28; count2++) {
804 next_sample = (int32_t)((*srcC++ & 0x0F) << 28) >> shift;
806 next_sample = (int32_t)((*srcC & 0xF0) << 24) >> shift;
808 next_sample += (current_sample * coeff1) +
809 (previous_sample * coeff2);
810 next_sample = av_clip_int16(next_sample >> 8);
812 previous_sample = current_sample;
813 current_sample = next_sample;
814 *samplesC = current_sample;
815 samplesC += avctx->channels;
820 if (avctx->codec->id != CODEC_ID_ADPCM_EA_R1) {
821 c->status[channel].predictor = current_sample;
822 c->status[channel].prev_sample = previous_sample;
826 src = src + buf_size - (4 + 4*avctx->channels);
827 samples += 28 * samples_in_chunk * avctx->channels;
830 case CODEC_ID_ADPCM_EA_XAS:
831 if (samples_end-samples < 32*4*avctx->channels
832 || buf_size < (4+15)*4*avctx->channels) {
836 for (channel=0; channel<avctx->channels; channel++) {
837 int coeff[2][4], shift[4];
838 short *s2, *s = &samples[channel];
839 for (n=0; n<4; n++, s+=32*avctx->channels) {
841 coeff[i][n] = ea_adpcm_table[(src[0]&0x0F)+4*i];
842 shift[n] = (src[2]&0x0F) + 8;
843 for (s2=s, i=0; i<2; i++, src+=2, s2+=avctx->channels)
844 s2[0] = (src[0]&0xF0) + (src[1]<<8);
847 for (m=2; m<32; m+=2) {
848 s = &samples[m*avctx->channels + channel];
849 for (n=0; n<4; n++, src++, s+=32*avctx->channels) {
850 for (s2=s, i=0; i<8; i+=4, s2+=avctx->channels) {
851 int level = (int32_t)((*src & (0xF0>>i)) << (24+i)) >> shift[n];
852 int pred = s2[-1*avctx->channels] * coeff[0][n]
853 + s2[-2*avctx->channels] * coeff[1][n];
854 s2[0] = av_clip_int16((level + pred + 0x80) >> 8);
859 samples += 32*4*avctx->channels;
861 case CODEC_ID_ADPCM_IMA_AMV:
862 case CODEC_ID_ADPCM_IMA_SMJPEG:
863 c->status[0].predictor = (int16_t)bytestream_get_le16(&src);
864 c->status[0].step_index = bytestream_get_le16(&src);
866 if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
869 while (src < buf + buf_size) {
874 if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
875 FFSWAP(char, hi, lo);
877 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
879 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
884 case CODEC_ID_ADPCM_CT:
885 while (src < buf + buf_size) {
887 *samples++ = adpcm_ct_expand_nibble(&c->status[0],
889 *samples++ = adpcm_ct_expand_nibble(&c->status[1],
892 *samples++ = adpcm_ct_expand_nibble(&c->status[0],
894 *samples++ = adpcm_ct_expand_nibble(&c->status[0],
900 case CODEC_ID_ADPCM_SBPRO_4:
901 case CODEC_ID_ADPCM_SBPRO_3:
902 case CODEC_ID_ADPCM_SBPRO_2:
903 if (!c->status[0].step_index) {
904 /* the first byte is a raw sample */
905 *samples++ = 128 * (*src++ - 0x80);
907 *samples++ = 128 * (*src++ - 0x80);
908 c->status[0].step_index = 1;
910 if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {
911 while (src < buf + buf_size) {
912 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
914 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
915 src[0] & 0x0F, 4, 0);
918 } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {
919 while (src < buf + buf_size && samples + 2 < samples_end) {
920 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
922 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
923 (src[0] >> 2) & 0x07, 3, 0);
924 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
925 src[0] & 0x03, 2, 0);
929 while (src < buf + buf_size && samples + 3 < samples_end) {
930 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
932 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
933 (src[0] >> 4) & 0x03, 2, 2);
934 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
935 (src[0] >> 2) & 0x03, 2, 2);
936 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
937 src[0] & 0x03, 2, 2);
942 case CODEC_ID_ADPCM_SWF:
946 int k0, signmask, nb_bits, count;
947 int size = buf_size*8;
949 init_get_bits(&gb, buf, size);
951 //read bits & initial values
952 nb_bits = get_bits(&gb, 2)+2;
953 //av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits);
954 table = swf_index_tables[nb_bits-2];
955 k0 = 1 << (nb_bits-2);
956 signmask = 1 << (nb_bits-1);
958 while (get_bits_count(&gb) <= size - 22*avctx->channels) {
959 for (i = 0; i < avctx->channels; i++) {
960 *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
961 c->status[i].step_index = get_bits(&gb, 6);
964 for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {
967 for (i = 0; i < avctx->channels; i++) {
968 // similar to IMA adpcm
969 int delta = get_bits(&gb, nb_bits);
970 int step = ff_adpcm_step_table[c->status[i].step_index];
971 long vpdiff = 0; // vpdiff = (delta+0.5)*step/4
982 if (delta & signmask)
983 c->status[i].predictor -= vpdiff;
985 c->status[i].predictor += vpdiff;
987 c->status[i].step_index += table[delta & (~signmask)];
989 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
990 c->status[i].predictor = av_clip_int16(c->status[i].predictor);
992 *samples++ = c->status[i].predictor;
993 if (samples >= samples_end) {
994 av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");
1003 case CODEC_ID_ADPCM_YAMAHA:
1004 while (src < buf + buf_size) {
1006 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
1008 *samples++ = adpcm_yamaha_expand_nibble(&c->status[1],
1011 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
1013 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
1019 case CODEC_ID_ADPCM_THP:
1022 unsigned int samplecnt;
1026 if (buf_size < 80) {
1027 av_log(avctx, AV_LOG_ERROR, "frame too small\n");
1032 samplecnt = bytestream_get_be32(&src);
1034 for (i = 0; i < 32; i++)
1035 table[0][i] = (int16_t)bytestream_get_be16(&src);
1037 /* Initialize the previous sample. */
1038 for (i = 0; i < 4; i++)
1039 prev[0][i] = (int16_t)bytestream_get_be16(&src);
1041 if (samplecnt >= (samples_end - samples) / (st + 1)) {
1042 av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");
1046 for (ch = 0; ch <= st; ch++) {
1047 samples = (unsigned short *) data + ch;
1049 /* Read in every sample for this channel. */
1050 for (i = 0; i < samplecnt / 14; i++) {
1051 int index = (*src >> 4) & 7;
1052 unsigned int exp = 28 - (*src++ & 15);
1053 int factor1 = table[ch][index * 2];
1054 int factor2 = table[ch][index * 2 + 1];
1056 /* Decode 14 samples. */
1057 for (n = 0; n < 14; n++) {
1059 if(n&1) sampledat= *src++ <<28;
1060 else sampledat= (*src&0xF0)<<24;
1062 sampledat = ((prev[ch][0]*factor1
1063 + prev[ch][1]*factor2) >> 11) + (sampledat>>exp);
1064 *samples = av_clip_int16(sampledat);
1065 prev[ch][1] = prev[ch][0];
1066 prev[ch][0] = *samples++;
1068 /* In case of stereo, skip one sample, this sample
1069 is for the other channel. */
1075 /* In the previous loop, in case stereo is used, samples is
1076 increased exactly one time too often. */
1084 *data_size = (uint8_t *)samples - (uint8_t *)data;
1089 #define ADPCM_DECODER(id_, name_, long_name_) \
1090 AVCodec ff_ ## name_ ## _decoder = { \
1092 .type = AVMEDIA_TYPE_AUDIO, \
1094 .priv_data_size = sizeof(ADPCMDecodeContext), \
1095 .init = adpcm_decode_init, \
1096 .decode = adpcm_decode_frame, \
1097 .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
1100 /* Note: Do not forget to add new entries to the Makefile as well. */
1101 ADPCM_DECODER(CODEC_ID_ADPCM_4XM, adpcm_4xm, "ADPCM 4X Movie");
1102 ADPCM_DECODER(CODEC_ID_ADPCM_CT, adpcm_ct, "ADPCM Creative Technology");
1103 ADPCM_DECODER(CODEC_ID_ADPCM_EA, adpcm_ea, "ADPCM Electronic Arts");
1104 ADPCM_DECODER(CODEC_ID_ADPCM_EA_MAXIS_XA, adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");
1105 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R1, adpcm_ea_r1, "ADPCM Electronic Arts R1");
1106 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R2, adpcm_ea_r2, "ADPCM Electronic Arts R2");
1107 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R3, adpcm_ea_r3, "ADPCM Electronic Arts R3");
1108 ADPCM_DECODER(CODEC_ID_ADPCM_EA_XAS, adpcm_ea_xas, "ADPCM Electronic Arts XAS");
1109 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_AMV, adpcm_ima_amv, "ADPCM IMA AMV");
1110 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3, "ADPCM IMA Duck DK3");
1111 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4, "ADPCM IMA Duck DK4");
1112 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_EACS, adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");
1113 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");
1114 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_ISS, adpcm_ima_iss, "ADPCM IMA Funcom ISS");
1115 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt, "ADPCM IMA QuickTime");
1116 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg, "ADPCM IMA Loki SDL MJPEG");
1117 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, "ADPCM IMA WAV");
1118 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws, "ADPCM IMA Westwood");
1119 ADPCM_DECODER(CODEC_ID_ADPCM_MS, adpcm_ms, "ADPCM Microsoft");
1120 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2, "ADPCM Sound Blaster Pro 2-bit");
1121 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3, "ADPCM Sound Blaster Pro 2.6-bit");
1122 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4, "ADPCM Sound Blaster Pro 4-bit");
1123 ADPCM_DECODER(CODEC_ID_ADPCM_SWF, adpcm_swf, "ADPCM Shockwave Flash");
1124 ADPCM_DECODER(CODEC_ID_ADPCM_THP, adpcm_thp, "ADPCM Nintendo Gamecube THP");
1125 ADPCM_DECODER(CODEC_ID_ADPCM_XA, adpcm_xa, "ADPCM CDROM XA");
1126 ADPCM_DECODER(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha, "ADPCM Yamaha");