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://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[] = {
75 // padded to zero where table size is less then 16
76 static const int swf_index_tables[4][16] = {
78 /*3*/ { -1, -1, 2, 4 },
79 /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },
80 /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }
85 typedef struct ADPCMDecodeContext {
86 ADPCMChannelStatus status[6];
89 static av_cold int adpcm_decode_init(AVCodecContext * avctx)
91 ADPCMDecodeContext *c = avctx->priv_data;
92 unsigned int max_channels = 2;
94 switch(avctx->codec->id) {
95 case CODEC_ID_ADPCM_EA_R1:
96 case CODEC_ID_ADPCM_EA_R2:
97 case CODEC_ID_ADPCM_EA_R3:
98 case CODEC_ID_ADPCM_EA_XAS:
102 if(avctx->channels > max_channels){
106 switch(avctx->codec->id) {
107 case CODEC_ID_ADPCM_CT:
108 c->status[0].step = c->status[1].step = 511;
110 case CODEC_ID_ADPCM_IMA_WAV:
111 if (avctx->bits_per_coded_sample != 4) {
112 av_log(avctx, AV_LOG_ERROR, "Only 4-bit ADPCM IMA WAV files are supported\n");
116 case CODEC_ID_ADPCM_IMA_WS:
117 if (avctx->extradata && avctx->extradata_size == 2 * 4) {
118 c->status[0].predictor = AV_RL32(avctx->extradata);
119 c->status[1].predictor = AV_RL32(avctx->extradata + 4);
125 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
129 static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)
133 int sign, delta, diff, step;
135 step = ff_adpcm_step_table[c->step_index];
136 step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];
137 if (step_index < 0) step_index = 0;
138 else if (step_index > 88) step_index = 88;
142 /* perform direct multiplication instead of series of jumps proposed by
143 * the reference ADPCM implementation since modern CPUs can do the mults
145 diff = ((2 * delta + 1) * step) >> shift;
146 predictor = c->predictor;
147 if (sign) predictor -= diff;
148 else predictor += diff;
150 c->predictor = av_clip_int16(predictor);
151 c->step_index = step_index;
153 return (short)c->predictor;
156 static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble, int shift)
162 step = ff_adpcm_step_table[c->step_index];
163 step_index = c->step_index + ff_adpcm_index_table[nibble];
164 step_index = av_clip(step_index, 0, 88);
167 if (nibble & 4) diff += step;
168 if (nibble & 2) diff += step >> 1;
169 if (nibble & 1) diff += step >> 2;
172 predictor = c->predictor - diff;
174 predictor = c->predictor + diff;
176 c->predictor = av_clip_int16(predictor);
177 c->step_index = step_index;
182 static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
186 predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;
187 predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
189 c->sample2 = c->sample1;
190 c->sample1 = av_clip_int16(predictor);
191 c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;
192 if (c->idelta < 16) c->idelta = 16;
197 static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)
199 int sign, delta, diff;
204 /* perform direct multiplication instead of series of jumps proposed by
205 * the reference ADPCM implementation since modern CPUs can do the mults
207 diff = ((2 * delta + 1) * c->step) >> 3;
208 /* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */
209 c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);
210 c->predictor = av_clip_int16(c->predictor);
211 /* calculate new step and clamp it to range 511..32767 */
212 new_step = (ff_adpcm_AdaptationTable[nibble & 7] * c->step) >> 8;
213 c->step = av_clip(new_step, 511, 32767);
215 return (short)c->predictor;
218 static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)
220 int sign, delta, diff;
222 sign = nibble & (1<<(size-1));
223 delta = nibble & ((1<<(size-1))-1);
224 diff = delta << (7 + c->step + shift);
227 c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);
229 /* calculate new step */
230 if (delta >= (2*size - 3) && c->step < 3)
232 else if (delta == 0 && c->step > 0)
235 return (short) c->predictor;
238 static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)
245 c->predictor += (c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8;
246 c->predictor = av_clip_int16(c->predictor);
247 c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;
248 c->step = av_clip(c->step, 127, 24567);
252 static void xa_decode(short *out, const unsigned char *in,
253 ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)
256 int shift,filter,f0,f1;
262 shift = 12 - (in[4+i*2] & 15);
263 filter = in[4+i*2] >> 4;
264 f0 = xa_adpcm_table[filter][0];
265 f1 = xa_adpcm_table[filter][1];
273 t = (signed char)(d<<4)>>4;
274 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
276 s_1 = av_clip_int16(s);
281 if (inc==2) { /* stereo */
284 s_1 = right->sample1;
285 s_2 = right->sample2;
286 out = out + 1 - 28*2;
289 shift = 12 - (in[5+i*2] & 15);
290 filter = in[5+i*2] >> 4;
292 f0 = xa_adpcm_table[filter][0];
293 f1 = xa_adpcm_table[filter][1];
298 t = (signed char)d >> 4;
299 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
301 s_1 = av_clip_int16(s);
306 if (inc==2) { /* stereo */
307 right->sample1 = s_1;
308 right->sample2 = s_2;
318 /* DK3 ADPCM support macro */
319 #define DK3_GET_NEXT_NIBBLE() \
320 if (decode_top_nibble_next) \
322 nibble = last_byte >> 4; \
323 decode_top_nibble_next = 0; \
327 last_byte = *src++; \
328 if (src >= buf + buf_size) break; \
329 nibble = last_byte & 0x0F; \
330 decode_top_nibble_next = 1; \
333 static int adpcm_decode_frame(AVCodecContext *avctx,
334 void *data, int *data_size,
337 const uint8_t *buf = avpkt->data;
338 int buf_size = avpkt->size;
339 ADPCMDecodeContext *c = avctx->priv_data;
340 ADPCMChannelStatus *cs;
341 int n, m, channel, i;
342 int block_predictor[2];
348 /* DK3 ADPCM accounting variables */
349 unsigned char last_byte = 0;
350 unsigned char nibble;
351 int decode_top_nibble_next = 0;
354 /* EA ADPCM state variables */
355 uint32_t samples_in_chunk;
356 int32_t previous_left_sample, previous_right_sample;
357 int32_t current_left_sample, current_right_sample;
358 int32_t next_left_sample, next_right_sample;
359 int32_t coeff1l, coeff2l, coeff1r, coeff2r;
360 uint8_t shift_left, shift_right;
362 int coeff[2][2], shift[2];//used in EA MAXIS ADPCM
367 //should protect all 4bit ADPCM variants
368 //8 is needed for CODEC_ID_ADPCM_IMA_WAV with 2 channels
370 if(*data_size/4 < buf_size + 8)
374 samples_end= samples + *data_size/2;
378 st = avctx->channels == 2 ? 1 : 0;
380 switch(avctx->codec->id) {
381 case CODEC_ID_ADPCM_IMA_QT:
382 n = buf_size - 2*avctx->channels;
383 for (channel = 0; channel < avctx->channels; channel++) {
386 cs = &(c->status[channel]);
387 /* (pppppp) (piiiiiii) */
389 /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
390 predictor = AV_RB16(src);
391 step_index = predictor & 0x7F;
396 if (cs->step_index == step_index) {
397 int diff = (int)predictor - cs->predictor;
404 cs->step_index = step_index;
405 cs->predictor = predictor;
408 if (cs->step_index > 88){
409 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
413 samples = (short*)data + channel;
415 for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */
416 *samples = adpcm_ima_qt_expand_nibble(cs, src[0] & 0x0F, 3);
417 samples += avctx->channels;
418 *samples = adpcm_ima_qt_expand_nibble(cs, src[0] >> 4 , 3);
419 samples += avctx->channels;
426 case CODEC_ID_ADPCM_IMA_WAV:
427 if (avctx->block_align != 0 && buf_size > avctx->block_align)
428 buf_size = avctx->block_align;
430 // samples_per_block= (block_align-4*chanels)*8 / (bits_per_sample * chanels) + 1;
432 for(i=0; i<avctx->channels; i++){
433 cs = &(c->status[i]);
434 cs->predictor = *samples++ = (int16_t)bytestream_get_le16(&src);
436 cs->step_index = *src++;
437 if (cs->step_index > 88){
438 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
441 if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null but is %d!!\n", src[-1]); /* unused */
444 while(src < buf + buf_size){
447 *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] & 0x0F, 3);
449 *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] >> 4 , 3);
455 case CODEC_ID_ADPCM_4XM:
456 cs = &(c->status[0]);
457 c->status[0].predictor= (int16_t)bytestream_get_le16(&src);
459 c->status[1].predictor= (int16_t)bytestream_get_le16(&src);
461 c->status[0].step_index= (int16_t)bytestream_get_le16(&src);
463 c->status[1].step_index= (int16_t)bytestream_get_le16(&src);
465 if (cs->step_index < 0) cs->step_index = 0;
466 if (cs->step_index > 88) cs->step_index = 88;
468 m= (buf_size - (src - buf))>>st;
470 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] & 0x0F, 4);
472 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] & 0x0F, 4);
473 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] >> 4, 4);
475 *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] >> 4, 4);
481 case CODEC_ID_ADPCM_MS:
482 if (avctx->block_align != 0 && buf_size > avctx->block_align)
483 buf_size = avctx->block_align;
484 n = buf_size - 7 * avctx->channels;
487 block_predictor[0] = av_clip(*src++, 0, 6);
488 block_predictor[1] = 0;
490 block_predictor[1] = av_clip(*src++, 0, 6);
491 c->status[0].idelta = (int16_t)bytestream_get_le16(&src);
493 c->status[1].idelta = (int16_t)bytestream_get_le16(&src);
495 c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor[0]];
496 c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor[0]];
497 c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor[1]];
498 c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor[1]];
500 c->status[0].sample1 = bytestream_get_le16(&src);
501 if (st) c->status[1].sample1 = bytestream_get_le16(&src);
502 c->status[0].sample2 = bytestream_get_le16(&src);
503 if (st) c->status[1].sample2 = bytestream_get_le16(&src);
505 *samples++ = c->status[0].sample2;
506 if (st) *samples++ = c->status[1].sample2;
507 *samples++ = c->status[0].sample1;
508 if (st) *samples++ = c->status[1].sample1;
510 *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], src[0] >> 4 );
511 *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
515 case CODEC_ID_ADPCM_IMA_DK4:
516 if (avctx->block_align != 0 && buf_size > avctx->block_align)
517 buf_size = avctx->block_align;
519 c->status[0].predictor = (int16_t)bytestream_get_le16(&src);
520 c->status[0].step_index = *src++;
522 *samples++ = c->status[0].predictor;
524 c->status[1].predictor = (int16_t)bytestream_get_le16(&src);
525 c->status[1].step_index = *src++;
527 *samples++ = c->status[1].predictor;
529 while (src < buf + buf_size) {
531 *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4 , 3);
532 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
535 case CODEC_ID_ADPCM_IMA_DK3:
536 if (avctx->block_align != 0 && buf_size > avctx->block_align)
537 buf_size = avctx->block_align;
539 if(buf_size + 16 > (samples_end - samples)*3/8)
542 c->status[0].predictor = (int16_t)AV_RL16(src + 10);
543 c->status[1].predictor = (int16_t)AV_RL16(src + 12);
544 c->status[0].step_index = src[14];
545 c->status[1].step_index = src[15];
546 /* sign extend the predictors */
548 diff_channel = c->status[1].predictor;
550 /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when
551 * the buffer is consumed */
554 /* for this algorithm, c->status[0] is the sum channel and
555 * c->status[1] is the diff channel */
557 /* process the first predictor of the sum channel */
558 DK3_GET_NEXT_NIBBLE();
559 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
561 /* process the diff channel predictor */
562 DK3_GET_NEXT_NIBBLE();
563 adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
565 /* process the first pair of stereo PCM samples */
566 diff_channel = (diff_channel + c->status[1].predictor) / 2;
567 *samples++ = c->status[0].predictor + c->status[1].predictor;
568 *samples++ = c->status[0].predictor - c->status[1].predictor;
570 /* process the second predictor of the sum channel */
571 DK3_GET_NEXT_NIBBLE();
572 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
574 /* process the second 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;
580 case CODEC_ID_ADPCM_IMA_ISS:
581 c->status[0].predictor = (int16_t)AV_RL16(src + 0);
582 c->status[0].step_index = src[2];
585 c->status[1].predictor = (int16_t)AV_RL16(src + 0);
586 c->status[1].step_index = src[2];
590 while (src < buf + buf_size) {
593 /* nibbles are swapped for mono */
601 *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);
602 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);
605 case CODEC_ID_ADPCM_IMA_WS:
606 while (src < buf + buf_size) {
608 *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4 , 3);
609 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
612 case CODEC_ID_ADPCM_XA:
613 while (buf_size >= 128) {
614 xa_decode(samples, src, &c->status[0], &c->status[1],
621 case CODEC_ID_ADPCM_IMA_EA_EACS:
622 samples_in_chunk = bytestream_get_le32(&src) >> (1-st);
624 if (samples_in_chunk > buf_size-4-(8<<st)) {
629 for (i=0; i<=st; i++)
630 c->status[i].step_index = bytestream_get_le32(&src);
631 for (i=0; i<=st; i++)
632 c->status[i].predictor = bytestream_get_le32(&src);
634 for (; samples_in_chunk; samples_in_chunk--, src++) {
635 *samples++ = adpcm_ima_expand_nibble(&c->status[0], *src>>4, 3);
636 *samples++ = adpcm_ima_expand_nibble(&c->status[st], *src&0x0F, 3);
639 case CODEC_ID_ADPCM_IMA_EA_SEAD:
640 for (; src < buf+buf_size; src++) {
641 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] >> 4, 6);
642 *samples++ = adpcm_ima_expand_nibble(&c->status[st],src[0]&0x0F, 6);
645 case CODEC_ID_ADPCM_EA:
646 /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,
647 each coding 28 stereo samples. */
649 av_log(avctx, AV_LOG_ERROR, "frame too small\n");
650 return AVERROR(EINVAL);
652 samples_in_chunk = AV_RL32(src);
653 if (samples_in_chunk / 28 > (buf_size - 12) / 30) {
654 av_log(avctx, AV_LOG_ERROR, "invalid frame\n");
655 return AVERROR(EINVAL);
658 current_left_sample = (int16_t)bytestream_get_le16(&src);
659 previous_left_sample = (int16_t)bytestream_get_le16(&src);
660 current_right_sample = (int16_t)bytestream_get_le16(&src);
661 previous_right_sample = (int16_t)bytestream_get_le16(&src);
663 for (count1 = 0; count1 < samples_in_chunk/28;count1++) {
664 coeff1l = ea_adpcm_table[ *src >> 4 ];
665 coeff2l = ea_adpcm_table[(*src >> 4 ) + 4];
666 coeff1r = ea_adpcm_table[*src & 0x0F];
667 coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];
670 shift_left = (*src >> 4 ) + 8;
671 shift_right = (*src & 0x0F) + 8;
674 for (count2 = 0; count2 < 28; count2++) {
675 next_left_sample = (int32_t)((*src & 0xF0) << 24) >> shift_left;
676 next_right_sample = (int32_t)((*src & 0x0F) << 28) >> shift_right;
679 next_left_sample = (next_left_sample +
680 (current_left_sample * coeff1l) +
681 (previous_left_sample * coeff2l) + 0x80) >> 8;
682 next_right_sample = (next_right_sample +
683 (current_right_sample * coeff1r) +
684 (previous_right_sample * coeff2r) + 0x80) >> 8;
686 previous_left_sample = current_left_sample;
687 current_left_sample = av_clip_int16(next_left_sample);
688 previous_right_sample = current_right_sample;
689 current_right_sample = av_clip_int16(next_right_sample);
690 *samples++ = (unsigned short)current_left_sample;
691 *samples++ = (unsigned short)current_right_sample;
695 if (src - buf == buf_size - 2)
696 src += 2; // Skip terminating 0x0000
699 case CODEC_ID_ADPCM_EA_MAXIS_XA:
700 for(channel = 0; channel < avctx->channels; channel++) {
702 coeff[channel][i] = ea_adpcm_table[(*src >> 4) + 4*i];
703 shift[channel] = (*src & 0x0F) + 8;
706 for (count1 = 0; count1 < (buf_size - avctx->channels) / avctx->channels; count1++) {
707 for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */
708 for(channel = 0; channel < avctx->channels; channel++) {
709 int32_t sample = (int32_t)(((*(src+channel) >> i) & 0x0F) << 0x1C) >> shift[channel];
711 c->status[channel].sample1 * coeff[channel][0] +
712 c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;
713 c->status[channel].sample2 = c->status[channel].sample1;
714 c->status[channel].sample1 = av_clip_int16(sample);
715 *samples++ = c->status[channel].sample1;
718 src+=avctx->channels;
721 case CODEC_ID_ADPCM_EA_R1:
722 case CODEC_ID_ADPCM_EA_R2:
723 case CODEC_ID_ADPCM_EA_R3: {
726 4chan: 0=fl, 1=rl, 2=fr, 3=rr
727 6chan: 0=fl, 1=c, 2=fr, 3=rl, 4=rr, 5=sub */
728 const int big_endian = avctx->codec->id == CODEC_ID_ADPCM_EA_R3;
729 int32_t previous_sample, current_sample, next_sample;
730 int32_t coeff1, coeff2;
732 unsigned int channel;
735 const uint8_t *src_end = buf + buf_size;
737 samples_in_chunk = (big_endian ? bytestream_get_be32(&src)
738 : bytestream_get_le32(&src)) / 28;
739 if (samples_in_chunk > UINT32_MAX/(28*avctx->channels) ||
740 28*samples_in_chunk*avctx->channels > samples_end-samples) {
745 for (channel=0; channel<avctx->channels; channel++) {
746 int32_t offset = (big_endian ? bytestream_get_be32(&src)
747 : bytestream_get_le32(&src))
748 + (avctx->channels-channel-1) * 4;
750 if ((offset < 0) || (offset >= src_end - src - 4)) break;
752 samplesC = samples + channel;
754 if (avctx->codec->id == CODEC_ID_ADPCM_EA_R1) {
755 current_sample = (int16_t)bytestream_get_le16(&srcC);
756 previous_sample = (int16_t)bytestream_get_le16(&srcC);
758 current_sample = c->status[channel].predictor;
759 previous_sample = c->status[channel].prev_sample;
762 for (count1=0; count1<samples_in_chunk; count1++) {
763 if (*srcC == 0xEE) { /* only seen in R2 and R3 */
765 if (srcC > src_end - 30*2) break;
766 current_sample = (int16_t)bytestream_get_be16(&srcC);
767 previous_sample = (int16_t)bytestream_get_be16(&srcC);
769 for (count2=0; count2<28; count2++) {
770 *samplesC = (int16_t)bytestream_get_be16(&srcC);
771 samplesC += avctx->channels;
774 coeff1 = ea_adpcm_table[ *srcC>>4 ];
775 coeff2 = ea_adpcm_table[(*srcC>>4) + 4];
776 shift = (*srcC++ & 0x0F) + 8;
778 if (srcC > src_end - 14) break;
779 for (count2=0; count2<28; count2++) {
781 next_sample = (int32_t)((*srcC++ & 0x0F) << 28) >> shift;
783 next_sample = (int32_t)((*srcC & 0xF0) << 24) >> shift;
785 next_sample += (current_sample * coeff1) +
786 (previous_sample * coeff2);
787 next_sample = av_clip_int16(next_sample >> 8);
789 previous_sample = current_sample;
790 current_sample = next_sample;
791 *samplesC = current_sample;
792 samplesC += avctx->channels;
797 if (avctx->codec->id != CODEC_ID_ADPCM_EA_R1) {
798 c->status[channel].predictor = current_sample;
799 c->status[channel].prev_sample = previous_sample;
803 src = src + buf_size - (4 + 4*avctx->channels);
804 samples += 28 * samples_in_chunk * avctx->channels;
807 case CODEC_ID_ADPCM_EA_XAS:
808 if (samples_end-samples < 32*4*avctx->channels
809 || buf_size < (4+15)*4*avctx->channels) {
813 for (channel=0; channel<avctx->channels; channel++) {
814 int coeff[2][4], shift[4];
815 short *s2, *s = &samples[channel];
816 for (n=0; n<4; n++, s+=32*avctx->channels) {
818 coeff[i][n] = ea_adpcm_table[(src[0]&0x0F)+4*i];
819 shift[n] = (src[2]&0x0F) + 8;
820 for (s2=s, i=0; i<2; i++, src+=2, s2+=avctx->channels)
821 s2[0] = (src[0]&0xF0) + (src[1]<<8);
824 for (m=2; m<32; m+=2) {
825 s = &samples[m*avctx->channels + channel];
826 for (n=0; n<4; n++, src++, s+=32*avctx->channels) {
827 for (s2=s, i=0; i<8; i+=4, s2+=avctx->channels) {
828 int level = (int32_t)((*src & (0xF0>>i)) << (24+i)) >> shift[n];
829 int pred = s2[-1*avctx->channels] * coeff[0][n]
830 + s2[-2*avctx->channels] * coeff[1][n];
831 s2[0] = av_clip_int16((level + pred + 0x80) >> 8);
836 samples += 32*4*avctx->channels;
838 case CODEC_ID_ADPCM_IMA_AMV:
839 case CODEC_ID_ADPCM_IMA_SMJPEG:
840 c->status[0].predictor = (int16_t)bytestream_get_le16(&src);
841 c->status[0].step_index = bytestream_get_le16(&src);
843 if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
846 while (src < buf + buf_size) {
851 if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
852 FFSWAP(char, hi, lo);
854 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
856 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
861 case CODEC_ID_ADPCM_CT:
862 while (src < buf + buf_size) {
864 *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4 );
865 *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);
868 case CODEC_ID_ADPCM_SBPRO_4:
869 case CODEC_ID_ADPCM_SBPRO_3:
870 case CODEC_ID_ADPCM_SBPRO_2:
871 if (!c->status[0].step_index) {
872 /* the first byte is a raw sample */
873 *samples++ = 128 * (*src++ - 0x80);
875 *samples++ = 128 * (*src++ - 0x80);
876 c->status[0].step_index = 1;
878 if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {
879 while (src < buf + buf_size) {
880 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
882 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
883 src[0] & 0x0F, 4, 0);
886 } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {
887 while (src < buf + buf_size && samples + 2 < samples_end) {
888 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
890 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
891 (src[0] >> 2) & 0x07, 3, 0);
892 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
893 src[0] & 0x03, 2, 0);
897 while (src < buf + buf_size && samples + 3 < samples_end) {
898 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
900 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
901 (src[0] >> 4) & 0x03, 2, 2);
902 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
903 (src[0] >> 2) & 0x03, 2, 2);
904 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
905 src[0] & 0x03, 2, 2);
910 case CODEC_ID_ADPCM_SWF:
914 int k0, signmask, nb_bits, count;
915 int size = buf_size*8;
917 init_get_bits(&gb, buf, size);
919 //read bits & initial values
920 nb_bits = get_bits(&gb, 2)+2;
921 //av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits);
922 table = swf_index_tables[nb_bits-2];
923 k0 = 1 << (nb_bits-2);
924 signmask = 1 << (nb_bits-1);
926 while (get_bits_count(&gb) <= size - 22*avctx->channels) {
927 for (i = 0; i < avctx->channels; i++) {
928 *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
929 c->status[i].step_index = get_bits(&gb, 6);
932 for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {
935 for (i = 0; i < avctx->channels; i++) {
936 // similar to IMA adpcm
937 int delta = get_bits(&gb, nb_bits);
938 int step = ff_adpcm_step_table[c->status[i].step_index];
939 long vpdiff = 0; // vpdiff = (delta+0.5)*step/4
950 if (delta & signmask)
951 c->status[i].predictor -= vpdiff;
953 c->status[i].predictor += vpdiff;
955 c->status[i].step_index += table[delta & (~signmask)];
957 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
958 c->status[i].predictor = av_clip_int16(c->status[i].predictor);
960 *samples++ = c->status[i].predictor;
961 if (samples >= samples_end) {
962 av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");
971 case CODEC_ID_ADPCM_YAMAHA:
972 while (src < buf + buf_size) {
974 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);
975 *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4 );
978 case CODEC_ID_ADPCM_THP:
981 unsigned int samplecnt;
986 av_log(avctx, AV_LOG_ERROR, "frame too small\n");
991 samplecnt = bytestream_get_be32(&src);
993 for (i = 0; i < 32; i++)
994 table[0][i] = (int16_t)bytestream_get_be16(&src);
996 /* Initialize the previous sample. */
997 for (i = 0; i < 4; i++)
998 prev[0][i] = (int16_t)bytestream_get_be16(&src);
1000 if (samplecnt >= (samples_end - samples) / (st + 1)) {
1001 av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");
1005 for (ch = 0; ch <= st; ch++) {
1006 samples = (unsigned short *) data + ch;
1008 /* Read in every sample for this channel. */
1009 for (i = 0; i < samplecnt / 14; i++) {
1010 int index = (*src >> 4) & 7;
1011 unsigned int exp = 28 - (*src++ & 15);
1012 int factor1 = table[ch][index * 2];
1013 int factor2 = table[ch][index * 2 + 1];
1015 /* Decode 14 samples. */
1016 for (n = 0; n < 14; n++) {
1018 if(n&1) sampledat= *src++ <<28;
1019 else sampledat= (*src&0xF0)<<24;
1021 sampledat = ((prev[ch][0]*factor1
1022 + prev[ch][1]*factor2) >> 11) + (sampledat>>exp);
1023 *samples = av_clip_int16(sampledat);
1024 prev[ch][1] = prev[ch][0];
1025 prev[ch][0] = *samples++;
1027 /* In case of stereo, skip one sample, this sample
1028 is for the other channel. */
1034 /* In the previous loop, in case stereo is used, samples is
1035 increased exactly one time too often. */
1043 *data_size = (uint8_t *)samples - (uint8_t *)data;
1048 #define ADPCM_DECODER(id_, name_, long_name_) \
1049 AVCodec ff_ ## name_ ## _decoder = { \
1051 .type = AVMEDIA_TYPE_AUDIO, \
1053 .priv_data_size = sizeof(ADPCMDecodeContext), \
1054 .init = adpcm_decode_init, \
1055 .decode = adpcm_decode_frame, \
1056 .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
1059 /* Note: Do not forget to add new entries to the Makefile as well. */
1060 ADPCM_DECODER(CODEC_ID_ADPCM_4XM, adpcm_4xm, "ADPCM 4X Movie");
1061 ADPCM_DECODER(CODEC_ID_ADPCM_CT, adpcm_ct, "ADPCM Creative Technology");
1062 ADPCM_DECODER(CODEC_ID_ADPCM_EA, adpcm_ea, "ADPCM Electronic Arts");
1063 ADPCM_DECODER(CODEC_ID_ADPCM_EA_MAXIS_XA, adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");
1064 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R1, adpcm_ea_r1, "ADPCM Electronic Arts R1");
1065 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R2, adpcm_ea_r2, "ADPCM Electronic Arts R2");
1066 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R3, adpcm_ea_r3, "ADPCM Electronic Arts R3");
1067 ADPCM_DECODER(CODEC_ID_ADPCM_EA_XAS, adpcm_ea_xas, "ADPCM Electronic Arts XAS");
1068 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_AMV, adpcm_ima_amv, "ADPCM IMA AMV");
1069 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3, "ADPCM IMA Duck DK3");
1070 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4, "ADPCM IMA Duck DK4");
1071 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_EACS, adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");
1072 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");
1073 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_ISS, adpcm_ima_iss, "ADPCM IMA Funcom ISS");
1074 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt, "ADPCM IMA QuickTime");
1075 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg, "ADPCM IMA Loki SDL MJPEG");
1076 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, "ADPCM IMA WAV");
1077 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws, "ADPCM IMA Westwood");
1078 ADPCM_DECODER(CODEC_ID_ADPCM_MS, adpcm_ms, "ADPCM Microsoft");
1079 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2, "ADPCM Sound Blaster Pro 2-bit");
1080 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3, "ADPCM Sound Blaster Pro 2.6-bit");
1081 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4, "ADPCM Sound Blaster Pro 4-bit");
1082 ADPCM_DECODER(CODEC_ID_ADPCM_SWF, adpcm_swf, "ADPCM Shockwave Flash");
1083 ADPCM_DECODER(CODEC_ID_ADPCM_THP, adpcm_thp, "ADPCM Nintendo Gamecube THP");
1084 ADPCM_DECODER(CODEC_ID_ADPCM_XA, adpcm_xa, "ADPCM CDROM XA");
1085 ADPCM_DECODER(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha, "ADPCM Yamaha");