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://wiki.multimedia.cx/index.php?title=Category:ADPCM_Audio_Codecs
46 * http://www.pcisys.net/~melanson/codecs/simpleaudio.html [dead]
47 * http://www.geocities.com/SiliconValley/8682/aud3.txt [dead]
48 * http://openquicktime.sourceforge.net/
49 * XAnim sources (xa_codec.c) http://xanim.polter.net/
50 * http://www.cs.ucla.edu/~leec/mediabench/applications.html [dead]
51 * SoX source code http://sox.sourceforge.net/
54 * http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html [dead]
55 * vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html [dead]
56 * readstr http://www.geocities.co.jp/Playtown/2004/
59 /* These are for CD-ROM XA ADPCM */
60 static const int xa_adpcm_table[5][2] = {
68 static const int ea_adpcm_table[] = {
76 // padded to zero where table size is less then 16
77 static const int swf_index_tables[4][16] = {
79 /*3*/ { -1, -1, 2, 4 },
80 /*4*/ { -1, -1, -1, -1, 2, 4, 6, 8 },
81 /*5*/ { -1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16 }
86 typedef struct ADPCMDecodeContext {
88 ADPCMChannelStatus status[6];
89 int vqa_version; /**< VQA version. Used for ADPCM_IMA_WS */
92 static av_cold int adpcm_decode_init(AVCodecContext * avctx)
94 ADPCMDecodeContext *c = avctx->priv_data;
95 unsigned int min_channels = 1;
96 unsigned int max_channels = 2;
98 switch(avctx->codec->id) {
99 case CODEC_ID_ADPCM_EA:
102 case CODEC_ID_ADPCM_EA_R1:
103 case CODEC_ID_ADPCM_EA_R2:
104 case CODEC_ID_ADPCM_EA_R3:
105 case CODEC_ID_ADPCM_EA_XAS:
109 if (avctx->channels < min_channels || avctx->channels > max_channels) {
110 av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
111 return AVERROR(EINVAL);
114 switch(avctx->codec->id) {
115 case CODEC_ID_ADPCM_CT:
116 c->status[0].step = c->status[1].step = 511;
118 case CODEC_ID_ADPCM_IMA_WAV:
119 if (avctx->bits_per_coded_sample != 4) {
120 av_log(avctx, AV_LOG_ERROR, "Only 4-bit ADPCM IMA WAV files are supported\n");
124 case CODEC_ID_ADPCM_IMA_APC:
125 if (avctx->extradata && avctx->extradata_size >= 8) {
126 c->status[0].predictor = AV_RL32(avctx->extradata);
127 c->status[1].predictor = AV_RL32(avctx->extradata + 4);
130 case CODEC_ID_ADPCM_IMA_WS:
131 if (avctx->extradata && avctx->extradata_size >= 42)
132 c->vqa_version = AV_RL16(avctx->extradata);
137 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
139 avcodec_get_frame_defaults(&c->frame);
140 avctx->coded_frame = &c->frame;
145 static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)
149 int sign, delta, diff, step;
151 step = ff_adpcm_step_table[c->step_index];
152 step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];
153 if (step_index < 0) step_index = 0;
154 else if (step_index > 88) step_index = 88;
158 /* perform direct multiplication instead of series of jumps proposed by
159 * the reference ADPCM implementation since modern CPUs can do the mults
161 diff = ((2 * delta + 1) * step) >> shift;
162 predictor = c->predictor;
163 if (sign) predictor -= diff;
164 else predictor += diff;
166 c->predictor = av_clip_int16(predictor);
167 c->step_index = step_index;
169 return (short)c->predictor;
172 static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble, int shift)
178 step = ff_adpcm_step_table[c->step_index];
179 step_index = c->step_index + ff_adpcm_index_table[nibble];
180 step_index = av_clip(step_index, 0, 88);
183 if (nibble & 4) diff += step;
184 if (nibble & 2) diff += step >> 1;
185 if (nibble & 1) diff += step >> 2;
188 predictor = c->predictor - diff;
190 predictor = c->predictor + diff;
192 c->predictor = av_clip_int16(predictor);
193 c->step_index = step_index;
198 static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
202 predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;
203 predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
205 c->sample2 = c->sample1;
206 c->sample1 = av_clip_int16(predictor);
207 c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;
208 if (c->idelta < 16) c->idelta = 16;
213 static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)
215 int sign, delta, diff;
220 /* perform direct multiplication instead of series of jumps proposed by
221 * the reference ADPCM implementation since modern CPUs can do the mults
223 diff = ((2 * delta + 1) * c->step) >> 3;
224 /* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */
225 c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);
226 c->predictor = av_clip_int16(c->predictor);
227 /* calculate new step and clamp it to range 511..32767 */
228 new_step = (ff_adpcm_AdaptationTable[nibble & 7] * c->step) >> 8;
229 c->step = av_clip(new_step, 511, 32767);
231 return (short)c->predictor;
234 static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)
236 int sign, delta, diff;
238 sign = nibble & (1<<(size-1));
239 delta = nibble & ((1<<(size-1))-1);
240 diff = delta << (7 + c->step + shift);
243 c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);
245 /* calculate new step */
246 if (delta >= (2*size - 3) && c->step < 3)
248 else if (delta == 0 && c->step > 0)
251 return (short) c->predictor;
254 static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)
261 c->predictor += (c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8;
262 c->predictor = av_clip_int16(c->predictor);
263 c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;
264 c->step = av_clip(c->step, 127, 24567);
268 static void xa_decode(short *out, const unsigned char *in,
269 ADPCMChannelStatus *left, ADPCMChannelStatus *right, int inc)
272 int shift,filter,f0,f1;
278 shift = 12 - (in[4+i*2] & 15);
279 filter = in[4+i*2] >> 4;
280 f0 = xa_adpcm_table[filter][0];
281 f1 = xa_adpcm_table[filter][1];
289 t = (signed char)(d<<4)>>4;
290 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
292 s_1 = av_clip_int16(s);
297 if (inc==2) { /* stereo */
300 s_1 = right->sample1;
301 s_2 = right->sample2;
302 out = out + 1 - 28*2;
305 shift = 12 - (in[5+i*2] & 15);
306 filter = in[5+i*2] >> 4;
308 f0 = xa_adpcm_table[filter][0];
309 f1 = xa_adpcm_table[filter][1];
314 t = (signed char)d >> 4;
315 s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
317 s_1 = av_clip_int16(s);
322 if (inc==2) { /* stereo */
323 right->sample1 = s_1;
324 right->sample2 = s_2;
334 * Get the number of samples that will be decoded from the packet.
335 * In one case, this is actually the maximum number of samples possible to
336 * decode with the given buf_size.
338 * @param[out] coded_samples set to the number of samples as coded in the
339 * packet, or 0 if the codec does not encode the
340 * number of samples in each frame.
342 static int get_nb_samples(AVCodecContext *avctx, const uint8_t *buf,
343 int buf_size, int *coded_samples)
345 ADPCMDecodeContext *s = avctx->priv_data;
347 int ch = avctx->channels;
348 int has_coded_samples = 0;
356 switch (avctx->codec->id) {
357 /* constant, only check buf_size */
358 case CODEC_ID_ADPCM_EA_XAS:
359 if (buf_size < 76 * ch)
363 case CODEC_ID_ADPCM_IMA_QT:
364 if (buf_size < 34 * ch)
368 /* simple 4-bit adpcm */
369 case CODEC_ID_ADPCM_CT:
370 case CODEC_ID_ADPCM_IMA_APC:
371 case CODEC_ID_ADPCM_IMA_EA_SEAD:
372 case CODEC_ID_ADPCM_IMA_WS:
373 case CODEC_ID_ADPCM_YAMAHA:
374 nb_samples = buf_size * 2 / ch;
380 /* simple 4-bit adpcm, with header */
382 switch (avctx->codec->id) {
383 case CODEC_ID_ADPCM_4XM:
384 case CODEC_ID_ADPCM_IMA_ISS: header_size = 4 * ch; break;
385 case CODEC_ID_ADPCM_IMA_AMV: header_size = 8; break;
386 case CODEC_ID_ADPCM_IMA_SMJPEG: header_size = 4; break;
389 return (buf_size - header_size) * 2 / ch;
391 /* more complex formats */
392 switch (avctx->codec->id) {
393 case CODEC_ID_ADPCM_EA:
394 has_coded_samples = 1;
397 *coded_samples = AV_RL32(buf);
398 *coded_samples -= *coded_samples % 28;
399 nb_samples = (buf_size - 12) / 30 * 28;
401 case CODEC_ID_ADPCM_IMA_EA_EACS:
402 has_coded_samples = 1;
405 *coded_samples = AV_RL32(buf);
406 nb_samples = (buf_size - (4 + 8 * ch)) * 2 / ch;
408 case CODEC_ID_ADPCM_EA_MAXIS_XA:
409 nb_samples = ((buf_size - ch) / (2 * ch)) * 2 * ch;
411 case CODEC_ID_ADPCM_EA_R1:
412 case CODEC_ID_ADPCM_EA_R2:
413 case CODEC_ID_ADPCM_EA_R3:
414 /* maximum number of samples */
415 /* has internal offsets and a per-frame switch to signal raw 16-bit */
416 has_coded_samples = 1;
419 switch (avctx->codec->id) {
420 case CODEC_ID_ADPCM_EA_R1:
421 header_size = 4 + 9 * ch;
422 *coded_samples = AV_RL32(buf);
424 case CODEC_ID_ADPCM_EA_R2:
425 header_size = 4 + 5 * ch;
426 *coded_samples = AV_RL32(buf);
428 case CODEC_ID_ADPCM_EA_R3:
429 header_size = 4 + 5 * ch;
430 *coded_samples = AV_RB32(buf);
433 *coded_samples -= *coded_samples % 28;
434 nb_samples = (buf_size - header_size) * 2 / ch;
435 nb_samples -= nb_samples % 28;
437 case CODEC_ID_ADPCM_IMA_DK3:
438 if (avctx->block_align > 0)
439 buf_size = FFMIN(buf_size, avctx->block_align);
440 nb_samples = ((buf_size - 16) * 8 / 3) / ch;
442 case CODEC_ID_ADPCM_IMA_DK4:
443 nb_samples = 1 + (buf_size - 4 * ch) * 2 / ch;
445 case CODEC_ID_ADPCM_IMA_WAV:
446 if (avctx->block_align > 0)
447 buf_size = FFMIN(buf_size, avctx->block_align);
448 nb_samples = 1 + (buf_size - 4 * ch) / (4 * ch) * 8;
450 case CODEC_ID_ADPCM_MS:
451 if (avctx->block_align > 0)
452 buf_size = FFMIN(buf_size, avctx->block_align);
453 nb_samples = 2 + (buf_size - 7 * ch) * 2 / ch;
455 case CODEC_ID_ADPCM_SBPRO_2:
456 case CODEC_ID_ADPCM_SBPRO_3:
457 case CODEC_ID_ADPCM_SBPRO_4:
459 int samples_per_byte;
460 switch (avctx->codec->id) {
461 case CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;
462 case CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;
463 case CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;
465 if (!s->status[0].step_index) {
469 nb_samples += buf_size * samples_per_byte / ch;
472 case CODEC_ID_ADPCM_SWF:
474 int buf_bits = buf_size * 8 - 2;
475 int nbits = (buf[0] >> 6) + 2;
476 int block_hdr_size = 22 * ch;
477 int block_size = block_hdr_size + nbits * ch * 4095;
478 int nblocks = buf_bits / block_size;
479 int bits_left = buf_bits - nblocks * block_size;
480 nb_samples = nblocks * 4096;
481 if (bits_left >= block_hdr_size)
482 nb_samples += 1 + (bits_left - block_hdr_size) / (nbits * ch);
485 case CODEC_ID_ADPCM_THP:
486 has_coded_samples = 1;
489 *coded_samples = AV_RB32(&buf[4]);
490 *coded_samples -= *coded_samples % 14;
491 nb_samples = (buf_size - 80) / (8 * ch) * 14;
493 case CODEC_ID_ADPCM_XA:
494 nb_samples = (buf_size / 128) * 224 / ch;
498 /* validate coded sample count */
499 if (has_coded_samples && (*coded_samples <= 0 || *coded_samples > nb_samples))
500 return AVERROR_INVALIDDATA;
505 /* DK3 ADPCM support macro */
506 #define DK3_GET_NEXT_NIBBLE() \
507 if (decode_top_nibble_next) \
509 nibble = last_byte >> 4; \
510 decode_top_nibble_next = 0; \
516 last_byte = *src++; \
517 if (src >= buf + buf_size) \
519 nibble = last_byte & 0x0F; \
520 decode_top_nibble_next = 1; \
523 static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
524 int *got_frame_ptr, AVPacket *avpkt)
526 const uint8_t *buf = avpkt->data;
527 int buf_size = avpkt->size;
528 ADPCMDecodeContext *c = avctx->priv_data;
529 ADPCMChannelStatus *cs;
530 int n, m, channel, i;
535 int nb_samples, coded_samples, ret;
537 nb_samples = get_nb_samples(avctx, buf, buf_size, &coded_samples);
538 if (nb_samples <= 0) {
539 av_log(avctx, AV_LOG_ERROR, "invalid number of samples in packet\n");
540 return AVERROR_INVALIDDATA;
543 /* get output buffer */
544 c->frame.nb_samples = nb_samples;
545 if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0) {
546 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
549 samples = (short *)c->frame.data[0];
551 /* use coded_samples when applicable */
552 /* it is always <= nb_samples, so the output buffer will be large enough */
554 if (coded_samples != nb_samples)
555 av_log(avctx, AV_LOG_WARNING, "mismatch in coded sample count\n");
556 c->frame.nb_samples = nb_samples = coded_samples;
561 st = avctx->channels == 2 ? 1 : 0;
563 switch(avctx->codec->id) {
564 case CODEC_ID_ADPCM_IMA_QT:
565 /* In QuickTime, IMA is encoded by chunks of 34 bytes (=64 samples).
566 Channel data is interleaved per-chunk. */
567 for (channel = 0; channel < avctx->channels; channel++) {
570 cs = &(c->status[channel]);
571 /* (pppppp) (piiiiiii) */
573 /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
574 predictor = AV_RB16(src);
575 step_index = predictor & 0x7F;
580 if (cs->step_index == step_index) {
581 int diff = (int)predictor - cs->predictor;
588 cs->step_index = step_index;
589 cs->predictor = predictor;
592 if (cs->step_index > 88){
593 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
597 samples = (short *)c->frame.data[0] + channel;
599 for (m = 0; m < 32; m++) {
600 *samples = adpcm_ima_qt_expand_nibble(cs, src[0] & 0x0F, 3);
601 samples += avctx->channels;
602 *samples = adpcm_ima_qt_expand_nibble(cs, src[0] >> 4 , 3);
603 samples += avctx->channels;
608 case CODEC_ID_ADPCM_IMA_WAV:
609 if (avctx->block_align != 0 && buf_size > avctx->block_align)
610 buf_size = avctx->block_align;
612 for(i=0; i<avctx->channels; i++){
613 cs = &(c->status[i]);
614 cs->predictor = *samples++ = (int16_t)bytestream_get_le16(&src);
616 cs->step_index = *src++;
617 if (cs->step_index > 88){
618 av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
621 if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null but is %d!!\n", src[-1]); /* unused */
624 for (n = (nb_samples - 1) / 8; n > 0; n--) {
625 for (i = 0; i < avctx->channels; i++) {
627 for (m = 0; m < 4; m++) {
629 *samples = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);
630 samples += avctx->channels;
631 *samples = adpcm_ima_expand_nibble(cs, v >> 4 , 3);
632 samples += avctx->channels;
634 samples -= 8 * avctx->channels - 1;
636 samples += 7 * avctx->channels;
639 case CODEC_ID_ADPCM_4XM:
640 for (i = 0; i < avctx->channels; i++)
641 c->status[i].predictor= (int16_t)bytestream_get_le16(&src);
643 for (i = 0; i < avctx->channels; i++) {
644 c->status[i].step_index= (int16_t)bytestream_get_le16(&src);
645 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
648 for (i = 0; i < avctx->channels; i++) {
649 samples = (short *)c->frame.data[0] + i;
651 for (n = nb_samples >> 1; n > 0; n--, src++) {
653 *samples = adpcm_ima_expand_nibble(cs, v & 0x0F, 4);
654 samples += avctx->channels;
655 *samples = adpcm_ima_expand_nibble(cs, v >> 4 , 4);
656 samples += avctx->channels;
660 case CODEC_ID_ADPCM_MS:
664 if (avctx->block_align != 0 && buf_size > avctx->block_align)
665 buf_size = avctx->block_align;
667 block_predictor = av_clip(*src++, 0, 6);
668 c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
669 c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
671 block_predictor = av_clip(*src++, 0, 6);
672 c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
673 c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
675 c->status[0].idelta = (int16_t)bytestream_get_le16(&src);
677 c->status[1].idelta = (int16_t)bytestream_get_le16(&src);
680 c->status[0].sample1 = bytestream_get_le16(&src);
681 if (st) c->status[1].sample1 = bytestream_get_le16(&src);
682 c->status[0].sample2 = bytestream_get_le16(&src);
683 if (st) c->status[1].sample2 = bytestream_get_le16(&src);
685 *samples++ = c->status[0].sample2;
686 if (st) *samples++ = c->status[1].sample2;
687 *samples++ = c->status[0].sample1;
688 if (st) *samples++ = c->status[1].sample1;
689 for(n = (nb_samples - 2) >> (1 - st); n > 0; n--, src++) {
690 *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], src[0] >> 4 );
691 *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
695 case CODEC_ID_ADPCM_IMA_DK4:
696 if (avctx->block_align != 0 && buf_size > avctx->block_align)
697 buf_size = avctx->block_align;
699 for (channel = 0; channel < avctx->channels; channel++) {
700 cs = &c->status[channel];
701 cs->predictor = (int16_t)bytestream_get_le16(&src);
702 cs->step_index = *src++;
704 *samples++ = cs->predictor;
706 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
708 *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4 , 3);
709 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
712 case CODEC_ID_ADPCM_IMA_DK3:
714 unsigned char last_byte = 0;
715 unsigned char nibble;
716 int decode_top_nibble_next = 0;
717 int end_of_packet = 0;
720 if (avctx->block_align != 0 && buf_size > avctx->block_align)
721 buf_size = avctx->block_align;
723 c->status[0].predictor = (int16_t)AV_RL16(src + 10);
724 c->status[1].predictor = (int16_t)AV_RL16(src + 12);
725 c->status[0].step_index = src[14];
726 c->status[1].step_index = src[15];
727 /* sign extend the predictors */
729 diff_channel = c->status[1].predictor;
731 /* the DK3_GET_NEXT_NIBBLE macro issues the break statement when
732 * the buffer is consumed */
735 /* for this algorithm, c->status[0] is the sum channel and
736 * c->status[1] is the diff channel */
738 /* process the first predictor of the sum channel */
739 DK3_GET_NEXT_NIBBLE();
740 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
742 /* process the diff channel predictor */
743 DK3_GET_NEXT_NIBBLE();
744 adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
746 /* process the first pair of stereo PCM samples */
747 diff_channel = (diff_channel + c->status[1].predictor) / 2;
748 *samples++ = c->status[0].predictor + c->status[1].predictor;
749 *samples++ = c->status[0].predictor - c->status[1].predictor;
751 /* process the second predictor of the sum channel */
752 DK3_GET_NEXT_NIBBLE();
753 adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
755 /* process the second pair of stereo PCM samples */
756 diff_channel = (diff_channel + c->status[1].predictor) / 2;
757 *samples++ = c->status[0].predictor + c->status[1].predictor;
758 *samples++ = c->status[0].predictor - c->status[1].predictor;
762 case CODEC_ID_ADPCM_IMA_ISS:
763 for (channel = 0; channel < avctx->channels; channel++) {
764 cs = &c->status[channel];
765 cs->predictor = (int16_t)bytestream_get_le16(&src);
766 cs->step_index = *src++;
770 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
773 /* nibbles are swapped for mono */
781 *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);
782 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);
785 case CODEC_ID_ADPCM_IMA_APC:
786 while (src < buf + buf_size) {
788 *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4 , 3);
789 *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
792 case CODEC_ID_ADPCM_IMA_WS:
793 for (channel = 0; channel < avctx->channels; channel++) {
796 int16_t *smp = samples + channel;
798 if (c->vqa_version == 3) {
799 src0 = src + channel * buf_size / 2;
802 src0 = src + channel;
803 src_stride = avctx->channels;
805 for (n = nb_samples / 2; n > 0; n--) {
808 *smp = adpcm_ima_expand_nibble(&c->status[channel], v >> 4 , 3);
809 smp += avctx->channels;
810 *smp = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);
811 smp += avctx->channels;
814 src = buf + buf_size;
816 case CODEC_ID_ADPCM_XA:
817 while (buf_size >= 128) {
818 xa_decode(samples, src, &c->status[0], &c->status[1],
825 case CODEC_ID_ADPCM_IMA_EA_EACS:
826 src += 4; // skip sample count (already read)
828 for (i=0; i<=st; i++)
829 c->status[i].step_index = bytestream_get_le32(&src);
830 for (i=0; i<=st; i++)
831 c->status[i].predictor = bytestream_get_le32(&src);
833 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
834 *samples++ = adpcm_ima_expand_nibble(&c->status[0], *src>>4, 3);
835 *samples++ = adpcm_ima_expand_nibble(&c->status[st], *src&0x0F, 3);
838 case CODEC_ID_ADPCM_IMA_EA_SEAD:
839 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
840 *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] >> 4, 6);
841 *samples++ = adpcm_ima_expand_nibble(&c->status[st],src[0]&0x0F, 6);
844 case CODEC_ID_ADPCM_EA:
846 int32_t previous_left_sample, previous_right_sample;
847 int32_t current_left_sample, current_right_sample;
848 int32_t next_left_sample, next_right_sample;
849 int32_t coeff1l, coeff2l, coeff1r, coeff2r;
850 uint8_t shift_left, shift_right;
852 /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,
853 each coding 28 stereo samples. */
855 if(avctx->channels != 2)
856 return AVERROR_INVALIDDATA;
858 src += 4; // skip sample count (already read)
860 current_left_sample = (int16_t)bytestream_get_le16(&src);
861 previous_left_sample = (int16_t)bytestream_get_le16(&src);
862 current_right_sample = (int16_t)bytestream_get_le16(&src);
863 previous_right_sample = (int16_t)bytestream_get_le16(&src);
865 for (count1 = 0; count1 < nb_samples / 28; count1++) {
866 coeff1l = ea_adpcm_table[ *src >> 4 ];
867 coeff2l = ea_adpcm_table[(*src >> 4 ) + 4];
868 coeff1r = ea_adpcm_table[*src & 0x0F];
869 coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];
872 shift_left = 20 - (*src >> 4);
873 shift_right = 20 - (*src & 0x0F);
876 for (count2 = 0; count2 < 28; count2++) {
877 next_left_sample = sign_extend(*src >> 4, 4) << shift_left;
878 next_right_sample = sign_extend(*src, 4) << shift_right;
881 next_left_sample = (next_left_sample +
882 (current_left_sample * coeff1l) +
883 (previous_left_sample * coeff2l) + 0x80) >> 8;
884 next_right_sample = (next_right_sample +
885 (current_right_sample * coeff1r) +
886 (previous_right_sample * coeff2r) + 0x80) >> 8;
888 previous_left_sample = current_left_sample;
889 current_left_sample = av_clip_int16(next_left_sample);
890 previous_right_sample = current_right_sample;
891 current_right_sample = av_clip_int16(next_right_sample);
892 *samples++ = (unsigned short)current_left_sample;
893 *samples++ = (unsigned short)current_right_sample;
897 if (src - buf == buf_size - 2)
898 src += 2; // Skip terminating 0x0000
902 case CODEC_ID_ADPCM_EA_MAXIS_XA:
904 int coeff[2][2], shift[2];
906 for(channel = 0; channel < avctx->channels; channel++) {
908 coeff[channel][i] = ea_adpcm_table[(*src >> 4) + 4*i];
909 shift[channel] = 20 - (*src & 0x0F);
912 for (count1 = 0; count1 < nb_samples / 2; count1++) {
913 for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */
914 for(channel = 0; channel < avctx->channels; channel++) {
915 int32_t sample = sign_extend(src[channel] >> i, 4) << shift[channel];
917 c->status[channel].sample1 * coeff[channel][0] +
918 c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;
919 c->status[channel].sample2 = c->status[channel].sample1;
920 c->status[channel].sample1 = av_clip_int16(sample);
921 *samples++ = c->status[channel].sample1;
924 src+=avctx->channels;
926 /* consume whole packet */
927 src = buf + buf_size;
930 case CODEC_ID_ADPCM_EA_R1:
931 case CODEC_ID_ADPCM_EA_R2:
932 case CODEC_ID_ADPCM_EA_R3: {
935 4chan: 0=fl, 1=rl, 2=fr, 3=rr
936 6chan: 0=fl, 1=c, 2=fr, 3=rl, 4=rr, 5=sub */
937 const int big_endian = avctx->codec->id == CODEC_ID_ADPCM_EA_R3;
938 int32_t previous_sample, current_sample, next_sample;
939 int32_t coeff1, coeff2;
941 unsigned int channel;
944 const uint8_t *src_end = buf + buf_size;
947 src += 4; // skip sample count (already read)
949 for (channel=0; channel<avctx->channels; channel++) {
950 int32_t offset = (big_endian ? bytestream_get_be32(&src)
951 : bytestream_get_le32(&src))
952 + (avctx->channels-channel-1) * 4;
954 if ((offset < 0) || (offset >= src_end - src - 4)) break;
956 samplesC = samples + channel;
958 if (avctx->codec->id == CODEC_ID_ADPCM_EA_R1) {
959 current_sample = (int16_t)bytestream_get_le16(&srcC);
960 previous_sample = (int16_t)bytestream_get_le16(&srcC);
962 current_sample = c->status[channel].predictor;
963 previous_sample = c->status[channel].prev_sample;
966 for (count1 = 0; count1 < nb_samples / 28; count1++) {
967 if (*srcC == 0xEE) { /* only seen in R2 and R3 */
969 if (srcC > src_end - 30*2) break;
970 current_sample = (int16_t)bytestream_get_be16(&srcC);
971 previous_sample = (int16_t)bytestream_get_be16(&srcC);
973 for (count2=0; count2<28; count2++) {
974 *samplesC = (int16_t)bytestream_get_be16(&srcC);
975 samplesC += avctx->channels;
978 coeff1 = ea_adpcm_table[ *srcC>>4 ];
979 coeff2 = ea_adpcm_table[(*srcC>>4) + 4];
980 shift = 20 - (*srcC++ & 0x0F);
982 if (srcC > src_end - 14) break;
983 for (count2=0; count2<28; count2++) {
985 next_sample = sign_extend(*srcC++, 4) << shift;
987 next_sample = sign_extend(*srcC >> 4, 4) << shift;
989 next_sample += (current_sample * coeff1) +
990 (previous_sample * coeff2);
991 next_sample = av_clip_int16(next_sample >> 8);
993 previous_sample = current_sample;
994 current_sample = next_sample;
995 *samplesC = current_sample;
996 samplesC += avctx->channels;
1002 } else if (count != count1) {
1003 av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");
1004 count = FFMAX(count, count1);
1007 if (avctx->codec->id != CODEC_ID_ADPCM_EA_R1) {
1008 c->status[channel].predictor = current_sample;
1009 c->status[channel].prev_sample = previous_sample;
1013 c->frame.nb_samples = count * 28;
1017 case CODEC_ID_ADPCM_EA_XAS:
1018 for (channel=0; channel<avctx->channels; channel++) {
1019 int coeff[2][4], shift[4];
1020 short *s2, *s = &samples[channel];
1021 for (n=0; n<4; n++, s+=32*avctx->channels) {
1023 coeff[i][n] = ea_adpcm_table[(src[0]&0x0F)+4*i];
1024 shift[n] = 20 - (src[2] & 0x0F);
1025 for (s2=s, i=0; i<2; i++, src+=2, s2+=avctx->channels)
1026 s2[0] = (src[0]&0xF0) + (src[1]<<8);
1029 for (m=2; m<32; m+=2) {
1030 s = &samples[m*avctx->channels + channel];
1031 for (n=0; n<4; n++, src++, s+=32*avctx->channels) {
1032 for (s2=s, i=0; i<8; i+=4, s2+=avctx->channels) {
1033 int level = sign_extend(*src >> (4 - i), 4) << shift[n];
1034 int pred = s2[-1*avctx->channels] * coeff[0][n]
1035 + s2[-2*avctx->channels] * coeff[1][n];
1036 s2[0] = av_clip_int16((level + pred + 0x80) >> 8);
1042 case CODEC_ID_ADPCM_IMA_AMV:
1043 case CODEC_ID_ADPCM_IMA_SMJPEG:
1044 if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV) {
1045 c->status[0].predictor = sign_extend(bytestream_get_le16(&src), 16);
1046 c->status[0].step_index = bytestream_get_le16(&src);
1049 c->status[0].predictor = sign_extend(bytestream_get_be16(&src), 16);
1050 c->status[0].step_index = bytestream_get_byte(&src);
1054 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
1059 if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
1060 FFSWAP(char, hi, lo);
1062 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1064 *samples++ = adpcm_ima_expand_nibble(&c->status[0],
1068 case CODEC_ID_ADPCM_CT:
1069 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
1071 *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4 );
1072 *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);
1075 case CODEC_ID_ADPCM_SBPRO_4:
1076 case CODEC_ID_ADPCM_SBPRO_3:
1077 case CODEC_ID_ADPCM_SBPRO_2:
1078 if (!c->status[0].step_index) {
1079 /* the first byte is a raw sample */
1080 *samples++ = 128 * (*src++ - 0x80);
1082 *samples++ = 128 * (*src++ - 0x80);
1083 c->status[0].step_index = 1;
1086 if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {
1087 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
1088 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1090 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1091 src[0] & 0x0F, 4, 0);
1093 } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {
1094 for (n = nb_samples / 3; n > 0; n--, src++) {
1095 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1096 src[0] >> 5 , 3, 0);
1097 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1098 (src[0] >> 2) & 0x07, 3, 0);
1099 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1100 src[0] & 0x03, 2, 0);
1103 for (n = nb_samples >> (2 - st); n > 0; n--, src++) {
1104 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1105 src[0] >> 6 , 2, 2);
1106 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1107 (src[0] >> 4) & 0x03, 2, 2);
1108 *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1109 (src[0] >> 2) & 0x03, 2, 2);
1110 *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1111 src[0] & 0x03, 2, 2);
1115 case CODEC_ID_ADPCM_SWF:
1119 int k0, signmask, nb_bits, count;
1120 int size = buf_size*8;
1122 init_get_bits(&gb, buf, size);
1124 //read bits & initial values
1125 nb_bits = get_bits(&gb, 2)+2;
1126 //av_log(NULL,AV_LOG_INFO,"nb_bits: %d\n", nb_bits);
1127 table = swf_index_tables[nb_bits-2];
1128 k0 = 1 << (nb_bits-2);
1129 signmask = 1 << (nb_bits-1);
1131 while (get_bits_count(&gb) <= size - 22*avctx->channels) {
1132 for (i = 0; i < avctx->channels; i++) {
1133 *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
1134 c->status[i].step_index = get_bits(&gb, 6);
1137 for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {
1140 for (i = 0; i < avctx->channels; i++) {
1141 // similar to IMA adpcm
1142 int delta = get_bits(&gb, nb_bits);
1143 int step = ff_adpcm_step_table[c->status[i].step_index];
1144 long vpdiff = 0; // vpdiff = (delta+0.5)*step/4
1155 if (delta & signmask)
1156 c->status[i].predictor -= vpdiff;
1158 c->status[i].predictor += vpdiff;
1160 c->status[i].step_index += table[delta & (~signmask)];
1162 c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
1163 c->status[i].predictor = av_clip_int16(c->status[i].predictor);
1165 *samples++ = c->status[i].predictor;
1172 case CODEC_ID_ADPCM_YAMAHA:
1173 for (n = nb_samples >> (1 - st); n > 0; n--, src++) {
1175 *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);
1176 *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4 );
1179 case CODEC_ID_ADPCM_THP:
1185 src += 4; // skip channel size
1186 src += 4; // skip number of samples (already read)
1188 for (i = 0; i < 32; i++)
1189 table[0][i] = (int16_t)bytestream_get_be16(&src);
1191 /* Initialize the previous sample. */
1192 for (i = 0; i < 4; i++)
1193 prev[0][i] = (int16_t)bytestream_get_be16(&src);
1195 for (ch = 0; ch <= st; ch++) {
1196 samples = (short *)c->frame.data[0] + ch;
1198 /* Read in every sample for this channel. */
1199 for (i = 0; i < nb_samples / 14; i++) {
1200 int index = (*src >> 4) & 7;
1201 unsigned int exp = *src++ & 15;
1202 int factor1 = table[ch][index * 2];
1203 int factor2 = table[ch][index * 2 + 1];
1205 /* Decode 14 samples. */
1206 for (n = 0; n < 14; n++) {
1208 if(n&1) sampledat = sign_extend(*src++, 4);
1209 else sampledat = sign_extend(*src >> 4, 4);
1211 sampledat = ((prev[ch][0]*factor1
1212 + prev[ch][1]*factor2) >> 11) + (sampledat << exp);
1213 *samples = av_clip_int16(sampledat);
1214 prev[ch][1] = prev[ch][0];
1215 prev[ch][0] = *samples++;
1217 /* In case of stereo, skip one sample, this sample
1218 is for the other channel. */
1231 *(AVFrame *)data = c->frame;
1237 #define ADPCM_DECODER(id_, name_, long_name_) \
1238 AVCodec ff_ ## name_ ## _decoder = { \
1240 .type = AVMEDIA_TYPE_AUDIO, \
1242 .priv_data_size = sizeof(ADPCMDecodeContext), \
1243 .init = adpcm_decode_init, \
1244 .decode = adpcm_decode_frame, \
1245 .capabilities = CODEC_CAP_DR1, \
1246 .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
1249 /* Note: Do not forget to add new entries to the Makefile as well. */
1250 ADPCM_DECODER(CODEC_ID_ADPCM_4XM, adpcm_4xm, "ADPCM 4X Movie");
1251 ADPCM_DECODER(CODEC_ID_ADPCM_CT, adpcm_ct, "ADPCM Creative Technology");
1252 ADPCM_DECODER(CODEC_ID_ADPCM_EA, adpcm_ea, "ADPCM Electronic Arts");
1253 ADPCM_DECODER(CODEC_ID_ADPCM_EA_MAXIS_XA, adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");
1254 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R1, adpcm_ea_r1, "ADPCM Electronic Arts R1");
1255 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R2, adpcm_ea_r2, "ADPCM Electronic Arts R2");
1256 ADPCM_DECODER(CODEC_ID_ADPCM_EA_R3, adpcm_ea_r3, "ADPCM Electronic Arts R3");
1257 ADPCM_DECODER(CODEC_ID_ADPCM_EA_XAS, adpcm_ea_xas, "ADPCM Electronic Arts XAS");
1258 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_AMV, adpcm_ima_amv, "ADPCM IMA AMV");
1259 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_APC, adpcm_ima_apc, "ADPCM IMA CRYO APC");
1260 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3, "ADPCM IMA Duck DK3");
1261 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4, "ADPCM IMA Duck DK4");
1262 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_EACS, adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");
1263 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");
1264 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_ISS, adpcm_ima_iss, "ADPCM IMA Funcom ISS");
1265 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt, "ADPCM IMA QuickTime");
1266 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg, "ADPCM IMA Loki SDL MJPEG");
1267 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, "ADPCM IMA WAV");
1268 ADPCM_DECODER(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws, "ADPCM IMA Westwood");
1269 ADPCM_DECODER(CODEC_ID_ADPCM_MS, adpcm_ms, "ADPCM Microsoft");
1270 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2, "ADPCM Sound Blaster Pro 2-bit");
1271 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3, "ADPCM Sound Blaster Pro 2.6-bit");
1272 ADPCM_DECODER(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4, "ADPCM Sound Blaster Pro 4-bit");
1273 ADPCM_DECODER(CODEC_ID_ADPCM_SWF, adpcm_swf, "ADPCM Shockwave Flash");
1274 ADPCM_DECODER(CODEC_ID_ADPCM_THP, adpcm_thp, "ADPCM Nintendo Gamecube THP");
1275 ADPCM_DECODER(CODEC_ID_ADPCM_XA, adpcm_xa, "ADPCM CDROM XA");
1276 ADPCM_DECODER(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha, "ADPCM Yamaha");