FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
adpcm.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2001-2003 The ffmpeg Project
3  *
4  * first version by Francois Revol (revol@free.fr)
5  * fringe ADPCM codecs (e.g., DK3, DK4, Westwood)
6  * by Mike Melanson (melanson@pcisys.net)
7  * CD-ROM XA ADPCM codec by BERO
8  * EA ADPCM decoder by Robin Kay (komadori@myrealbox.com)
9  * EA ADPCM R1/R2/R3 decoder by Peter Ross (pross@xvid.org)
10  * EA IMA EACS decoder by Peter Ross (pross@xvid.org)
11  * EA IMA SEAD decoder by Peter Ross (pross@xvid.org)
12  * EA ADPCM XAS decoder by Peter Ross (pross@xvid.org)
13  * MAXIS EA ADPCM decoder by Robert Marston (rmarston@gmail.com)
14  * THP ADPCM decoder by Marco Gerards (mgerards@xs4all.nl)
15  *
16  * This file is part of FFmpeg.
17  *
18  * FFmpeg is free software; you can redistribute it and/or
19  * modify it under the terms of the GNU Lesser General Public
20  * License as published by the Free Software Foundation; either
21  * version 2.1 of the License, or (at your option) any later version.
22  *
23  * FFmpeg is distributed in the hope that it will be useful,
24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26  * Lesser General Public License for more details.
27  *
28  * You should have received a copy of the GNU Lesser General Public
29  * License along with FFmpeg; if not, write to the Free Software
30  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
31  */
32 #include "avcodec.h"
33 #include "get_bits.h"
34 #include "bytestream.h"
35 #include "adpcm.h"
36 #include "adpcm_data.h"
37 #include "internal.h"
38 
39 /**
40  * @file
41  * ADPCM decoders
42  * Features and limitations:
43  *
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/
52  *
53  * CD-ROM XA:
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/
57  */
58 
59 /* These are for CD-ROM XA ADPCM */
60 static const int xa_adpcm_table[5][2] = {
61  { 0, 0 },
62  { 60, 0 },
63  { 115, -52 },
64  { 98, -55 },
65  { 122, -60 }
66 };
67 
68 static const int ea_adpcm_table[] = {
69  0, 240, 460, 392,
70  0, 0, -208, -220,
71  0, 1, 3, 4,
72  7, 8, 10, 11,
73  0, -1, -3, -4
74 };
75 
76 // padded to zero where table size is less then 16
77 static const int swf_index_tables[4][16] = {
78  /*2*/ { -1, 2 },
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 }
82 };
83 
84 /* end of tables */
85 
86 typedef struct ADPCMDecodeContext {
87  ADPCMChannelStatus status[6];
88  int vqa_version; /**< VQA version. Used for ADPCM_IMA_WS */
89 } ADPCMDecodeContext;
90 
91 static av_cold int adpcm_decode_init(AVCodecContext * avctx)
92 {
93  ADPCMDecodeContext *c = avctx->priv_data;
94  unsigned int min_channels = 1;
95  unsigned int max_channels = 2;
96 
97  switch(avctx->codec->id) {
98  case AV_CODEC_ID_ADPCM_DTK:
99  case AV_CODEC_ID_ADPCM_EA:
100  min_channels = 2;
101  break;
102  case AV_CODEC_ID_ADPCM_AFC:
103  case AV_CODEC_ID_ADPCM_EA_R1:
104  case AV_CODEC_ID_ADPCM_EA_R2:
105  case AV_CODEC_ID_ADPCM_EA_R3:
106  case AV_CODEC_ID_ADPCM_EA_XAS:
107  case AV_CODEC_ID_ADPCM_THP:
108  max_channels = 6;
109  break;
110  }
111  if (avctx->channels < min_channels || avctx->channels > max_channels) {
112  av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
113  return AVERROR(EINVAL);
114  }
115 
116  switch(avctx->codec->id) {
117  case AV_CODEC_ID_ADPCM_CT:
118  c->status[0].step = c->status[1].step = 511;
119  break;
120  case AV_CODEC_ID_ADPCM_IMA_WAV:
121  if (avctx->bits_per_coded_sample != 4) {
122  av_log(avctx, AV_LOG_ERROR, "Only 4-bit ADPCM IMA WAV files are supported\n");
123  return -1;
124  }
125  break;
126  case AV_CODEC_ID_ADPCM_IMA_APC:
127  if (avctx->extradata && avctx->extradata_size >= 8) {
128  c->status[0].predictor = AV_RL32(avctx->extradata);
129  c->status[1].predictor = AV_RL32(avctx->extradata + 4);
130  }
131  break;
132  case AV_CODEC_ID_ADPCM_IMA_WS:
133  if (avctx->extradata && avctx->extradata_size >= 2)
134  c->vqa_version = AV_RL16(avctx->extradata);
135  break;
136  default:
137  break;
138  }
139 
140  switch(avctx->codec->id) {
141  case AV_CODEC_ID_ADPCM_IMA_QT:
142  case AV_CODEC_ID_ADPCM_IMA_WAV:
143  case AV_CODEC_ID_ADPCM_4XM:
144  case AV_CODEC_ID_ADPCM_XA:
145  case AV_CODEC_ID_ADPCM_EA_R1:
146  case AV_CODEC_ID_ADPCM_EA_R2:
147  case AV_CODEC_ID_ADPCM_EA_R3:
148  case AV_CODEC_ID_ADPCM_EA_XAS:
149  case AV_CODEC_ID_ADPCM_THP:
150  case AV_CODEC_ID_ADPCM_AFC:
151  case AV_CODEC_ID_ADPCM_DTK:
152  avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
153  break;
154  case AV_CODEC_ID_ADPCM_IMA_WS:
155  avctx->sample_fmt = c->vqa_version == 3 ? AV_SAMPLE_FMT_S16P :
156  AV_SAMPLE_FMT_S16;
157  break;
158  default:
159  avctx->sample_fmt = AV_SAMPLE_FMT_S16;
160  }
161 
162  return 0;
163 }
164 
165 static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble, int shift)
166 {
167  int step_index;
168  int predictor;
169  int sign, delta, diff, step;
170 
171  step = ff_adpcm_step_table[c->step_index];
172  step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];
173  step_index = av_clip(step_index, 0, 88);
174 
175  sign = nibble & 8;
176  delta = nibble & 7;
177  /* perform direct multiplication instead of series of jumps proposed by
178  * the reference ADPCM implementation since modern CPUs can do the mults
179  * quickly enough */
180  diff = ((2 * delta + 1) * step) >> shift;
181  predictor = c->predictor;
182  if (sign) predictor -= diff;
183  else predictor += diff;
184 
185  c->predictor = av_clip_int16(predictor);
186  c->step_index = step_index;
187 
188  return (short)c->predictor;
189 }
190 
191 static inline int adpcm_ima_qt_expand_nibble(ADPCMChannelStatus *c, int nibble, int shift)
192 {
193  int step_index;
194  int predictor;
195  int diff, step;
196 
197  step = ff_adpcm_step_table[c->step_index];
198  step_index = c->step_index + ff_adpcm_index_table[nibble];
199  step_index = av_clip(step_index, 0, 88);
200 
201  diff = step >> 3;
202  if (nibble & 4) diff += step;
203  if (nibble & 2) diff += step >> 1;
204  if (nibble & 1) diff += step >> 2;
205 
206  if (nibble & 8)
207  predictor = c->predictor - diff;
208  else
209  predictor = c->predictor + diff;
210 
211  c->predictor = av_clip_int16(predictor);
212  c->step_index = step_index;
213 
214  return c->predictor;
215 }
216 
217 static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, int nibble)
218 {
219  int predictor;
220 
221  predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 64;
222  predictor += ((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
223 
224  c->sample2 = c->sample1;
225  c->sample1 = av_clip_int16(predictor);
226  c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;
227  if (c->idelta < 16) c->idelta = 16;
228 
229  return c->sample1;
230 }
231 
232 static inline short adpcm_ima_oki_expand_nibble(ADPCMChannelStatus *c, int nibble)
233 {
234  int step_index, predictor, sign, delta, diff, step;
235 
236  step = ff_adpcm_oki_step_table[c->step_index];
237  step_index = c->step_index + ff_adpcm_index_table[(unsigned)nibble];
238  step_index = av_clip(step_index, 0, 48);
239 
240  sign = nibble & 8;
241  delta = nibble & 7;
242  diff = ((2 * delta + 1) * step) >> 3;
243  predictor = c->predictor;
244  if (sign) predictor -= diff;
245  else predictor += diff;
246 
247  c->predictor = av_clip(predictor, -2048, 2047);
248  c->step_index = step_index;
249 
250  return c->predictor << 4;
251 }
252 
253 static inline short adpcm_ct_expand_nibble(ADPCMChannelStatus *c, char nibble)
254 {
255  int sign, delta, diff;
256  int new_step;
257 
258  sign = nibble & 8;
259  delta = nibble & 7;
260  /* perform direct multiplication instead of series of jumps proposed by
261  * the reference ADPCM implementation since modern CPUs can do the mults
262  * quickly enough */
263  diff = ((2 * delta + 1) * c->step) >> 3;
264  /* predictor update is not so trivial: predictor is multiplied on 254/256 before updating */
265  c->predictor = ((c->predictor * 254) >> 8) + (sign ? -diff : diff);
266  c->predictor = av_clip_int16(c->predictor);
267  /* calculate new step and clamp it to range 511..32767 */
268  new_step = (ff_adpcm_AdaptationTable[nibble & 7] * c->step) >> 8;
269  c->step = av_clip(new_step, 511, 32767);
270 
271  return (short)c->predictor;
272 }
273 
274 static inline short adpcm_sbpro_expand_nibble(ADPCMChannelStatus *c, char nibble, int size, int shift)
275 {
276  int sign, delta, diff;
277 
278  sign = nibble & (1<<(size-1));
279  delta = nibble & ((1<<(size-1))-1);
280  diff = delta << (7 + c->step + shift);
281 
282  /* clamp result */
283  c->predictor = av_clip(c->predictor + (sign ? -diff : diff), -16384,16256);
284 
285  /* calculate new step */
286  if (delta >= (2*size - 3) && c->step < 3)
287  c->step++;
288  else if (delta == 0 && c->step > 0)
289  c->step--;
290 
291  return (short) c->predictor;
292 }
293 
294 static inline short adpcm_yamaha_expand_nibble(ADPCMChannelStatus *c, unsigned char nibble)
295 {
296  if(!c->step) {
297  c->predictor = 0;
298  c->step = 127;
299  }
300 
301  c->predictor += (c->step * ff_adpcm_yamaha_difflookup[nibble]) / 8;
302  c->predictor = av_clip_int16(c->predictor);
303  c->step = (c->step * ff_adpcm_yamaha_indexscale[nibble]) >> 8;
304  c->step = av_clip(c->step, 127, 24567);
305  return c->predictor;
306 }
307 
308 static int xa_decode(AVCodecContext *avctx, int16_t *out0, int16_t *out1,
309  const uint8_t *in, ADPCMChannelStatus *left,
310  ADPCMChannelStatus *right, int channels, int sample_offset)
311 {
312  int i, j;
313  int shift,filter,f0,f1;
314  int s_1,s_2;
315  int d,s,t;
316 
317  out0 += sample_offset;
318  if (channels == 1)
319  out1 = out0 + 28;
320  else
321  out1 += sample_offset;
322 
323  for(i=0;i<4;i++) {
324  shift = 12 - (in[4+i*2] & 15);
325  filter = in[4+i*2] >> 4;
326  if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table)) {
327  avpriv_request_sample(avctx, "unknown XA-ADPCM filter %d", filter);
328  filter=0;
329  }
330  f0 = xa_adpcm_table[filter][0];
331  f1 = xa_adpcm_table[filter][1];
332 
333  s_1 = left->sample1;
334  s_2 = left->sample2;
335 
336  for(j=0;j<28;j++) {
337  d = in[16+i+j*4];
338 
339  t = sign_extend(d, 4);
340  s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
341  s_2 = s_1;
342  s_1 = av_clip_int16(s);
343  out0[j] = s_1;
344  }
345 
346  if (channels == 2) {
347  left->sample1 = s_1;
348  left->sample2 = s_2;
349  s_1 = right->sample1;
350  s_2 = right->sample2;
351  }
352 
353  shift = 12 - (in[5+i*2] & 15);
354  filter = in[5+i*2] >> 4;
355  if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table)) {
356  avpriv_request_sample(avctx, "unknown XA-ADPCM filter %d", filter);
357  filter=0;
358  }
359 
360  f0 = xa_adpcm_table[filter][0];
361  f1 = xa_adpcm_table[filter][1];
362 
363  for(j=0;j<28;j++) {
364  d = in[16+i+j*4];
365 
366  t = sign_extend(d >> 4, 4);
367  s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
368  s_2 = s_1;
369  s_1 = av_clip_int16(s);
370  out1[j] = s_1;
371  }
372 
373  if (channels == 2) {
374  right->sample1 = s_1;
375  right->sample2 = s_2;
376  } else {
377  left->sample1 = s_1;
378  left->sample2 = s_2;
379  }
380 
381  out0 += 28 * (3 - channels);
382  out1 += 28 * (3 - channels);
383  }
384 
385  return 0;
386 }
387 
388 static void adpcm_swf_decode(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int16_t *samples)
389 {
390  ADPCMDecodeContext *c = avctx->priv_data;
391  GetBitContext gb;
392  const int *table;
393  int k0, signmask, nb_bits, count;
394  int size = buf_size*8;
395  int i;
396 
397  init_get_bits(&gb, buf, size);
398 
399  //read bits & initial values
400  nb_bits = get_bits(&gb, 2)+2;
401  table = swf_index_tables[nb_bits-2];
402  k0 = 1 << (nb_bits-2);
403  signmask = 1 << (nb_bits-1);
404 
405  while (get_bits_count(&gb) <= size - 22*avctx->channels) {
406  for (i = 0; i < avctx->channels; i++) {
407  *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
408  c->status[i].step_index = get_bits(&gb, 6);
409  }
410 
411  for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {
412  int i;
413 
414  for (i = 0; i < avctx->channels; i++) {
415  // similar to IMA adpcm
416  int delta = get_bits(&gb, nb_bits);
417  int step = ff_adpcm_step_table[c->status[i].step_index];
418  long vpdiff = 0; // vpdiff = (delta+0.5)*step/4
419  int k = k0;
420 
421  do {
422  if (delta & k)
423  vpdiff += step;
424  step >>= 1;
425  k >>= 1;
426  } while(k);
427  vpdiff += step;
428 
429  if (delta & signmask)
430  c->status[i].predictor -= vpdiff;
431  else
432  c->status[i].predictor += vpdiff;
433 
434  c->status[i].step_index += table[delta & (~signmask)];
435 
436  c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
437  c->status[i].predictor = av_clip_int16(c->status[i].predictor);
438 
439  *samples++ = c->status[i].predictor;
440  }
441  }
442  }
443 }
444 
445 /**
446  * Get the number of samples that will be decoded from the packet.
447  * In one case, this is actually the maximum number of samples possible to
448  * decode with the given buf_size.
449  *
450  * @param[out] coded_samples set to the number of samples as coded in the
451  * packet, or 0 if the codec does not encode the
452  * number of samples in each frame.
453  */
454 static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,
455  int buf_size, int *coded_samples)
456 {
457  ADPCMDecodeContext *s = avctx->priv_data;
458  int nb_samples = 0;
459  int ch = avctx->channels;
460  int has_coded_samples = 0;
461  int header_size;
462 
463  *coded_samples = 0;
464 
465  if(ch <= 0)
466  return 0;
467 
468  switch (avctx->codec->id) {
469  /* constant, only check buf_size */
470  case AV_CODEC_ID_ADPCM_EA_XAS:
471  if (buf_size < 76 * ch)
472  return 0;
473  nb_samples = 128;
474  break;
475  case AV_CODEC_ID_ADPCM_IMA_QT:
476  if (buf_size < 34 * ch)
477  return 0;
478  nb_samples = 64;
479  break;
480  /* simple 4-bit adpcm */
481  case AV_CODEC_ID_ADPCM_CT:
482  case AV_CODEC_ID_ADPCM_IMA_APC:
483  case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
484  case AV_CODEC_ID_ADPCM_IMA_OKI:
485  case AV_CODEC_ID_ADPCM_IMA_WS:
486  case AV_CODEC_ID_ADPCM_YAMAHA:
487  nb_samples = buf_size * 2 / ch;
488  break;
489  }
490  if (nb_samples)
491  return nb_samples;
492 
493  /* simple 4-bit adpcm, with header */
494  header_size = 0;
495  switch (avctx->codec->id) {
496  case AV_CODEC_ID_ADPCM_4XM:
497  case AV_CODEC_ID_ADPCM_IMA_ISS: header_size = 4 * ch; break;
498  case AV_CODEC_ID_ADPCM_IMA_AMV: header_size = 8; break;
499  case AV_CODEC_ID_ADPCM_IMA_SMJPEG: header_size = 4 * ch; break;
500  }
501  if (header_size > 0)
502  return (buf_size - header_size) * 2 / ch;
503 
504  /* more complex formats */
505  switch (avctx->codec->id) {
506  case AV_CODEC_ID_ADPCM_EA:
507  has_coded_samples = 1;
508  *coded_samples = bytestream2_get_le32(gb);
509  *coded_samples -= *coded_samples % 28;
510  nb_samples = (buf_size - 12) / 30 * 28;
511  break;
512  case AV_CODEC_ID_ADPCM_IMA_EA_EACS:
513  has_coded_samples = 1;
514  *coded_samples = bytestream2_get_le32(gb);
515  nb_samples = (buf_size - (4 + 8 * ch)) * 2 / ch;
516  break;
517  case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:
518  nb_samples = (buf_size - ch) / ch * 2;
519  break;
520  case AV_CODEC_ID_ADPCM_EA_R1:
521  case AV_CODEC_ID_ADPCM_EA_R2:
522  case AV_CODEC_ID_ADPCM_EA_R3:
523  /* maximum number of samples */
524  /* has internal offsets and a per-frame switch to signal raw 16-bit */
525  has_coded_samples = 1;
526  switch (avctx->codec->id) {
527  case AV_CODEC_ID_ADPCM_EA_R1:
528  header_size = 4 + 9 * ch;
529  *coded_samples = bytestream2_get_le32(gb);
530  break;
531  case AV_CODEC_ID_ADPCM_EA_R2:
532  header_size = 4 + 5 * ch;
533  *coded_samples = bytestream2_get_le32(gb);
534  break;
535  case AV_CODEC_ID_ADPCM_EA_R3:
536  header_size = 4 + 5 * ch;
537  *coded_samples = bytestream2_get_be32(gb);
538  break;
539  }
540  *coded_samples -= *coded_samples % 28;
541  nb_samples = (buf_size - header_size) * 2 / ch;
542  nb_samples -= nb_samples % 28;
543  break;
544  case AV_CODEC_ID_ADPCM_IMA_DK3:
545  if (avctx->block_align > 0)
546  buf_size = FFMIN(buf_size, avctx->block_align);
547  nb_samples = ((buf_size - 16) * 2 / 3 * 4) / ch;
548  break;
549  case AV_CODEC_ID_ADPCM_IMA_DK4:
550  if (avctx->block_align > 0)
551  buf_size = FFMIN(buf_size, avctx->block_align);
552  nb_samples = 1 + (buf_size - 4 * ch) * 2 / ch;
553  break;
554  case AV_CODEC_ID_ADPCM_IMA_RAD:
555  if (avctx->block_align > 0)
556  buf_size = FFMIN(buf_size, avctx->block_align);
557  nb_samples = (buf_size - 4 * ch) * 2 / ch;
558  break;
559  case AV_CODEC_ID_ADPCM_IMA_WAV:
560  if (avctx->block_align > 0)
561  buf_size = FFMIN(buf_size, avctx->block_align);
562  nb_samples = 1 + (buf_size - 4 * ch) / (4 * ch) * 8;
563  break;
564  case AV_CODEC_ID_ADPCM_MS:
565  if (avctx->block_align > 0)
566  buf_size = FFMIN(buf_size, avctx->block_align);
567  nb_samples = 2 + (buf_size - 7 * ch) * 2 / ch;
568  break;
569  case AV_CODEC_ID_ADPCM_SBPRO_2:
570  case AV_CODEC_ID_ADPCM_SBPRO_3:
571  case AV_CODEC_ID_ADPCM_SBPRO_4:
572  {
573  int samples_per_byte;
574  switch (avctx->codec->id) {
575  case AV_CODEC_ID_ADPCM_SBPRO_2: samples_per_byte = 4; break;
576  case AV_CODEC_ID_ADPCM_SBPRO_3: samples_per_byte = 3; break;
577  case AV_CODEC_ID_ADPCM_SBPRO_4: samples_per_byte = 2; break;
578  }
579  if (!s->status[0].step_index) {
580  nb_samples++;
581  buf_size -= ch;
582  }
583  nb_samples += buf_size * samples_per_byte / ch;
584  break;
585  }
586  case AV_CODEC_ID_ADPCM_SWF:
587  {
588  int buf_bits = buf_size * 8 - 2;
589  int nbits = (bytestream2_get_byte(gb) >> 6) + 2;
590  int block_hdr_size = 22 * ch;
591  int block_size = block_hdr_size + nbits * ch * 4095;
592  int nblocks = buf_bits / block_size;
593  int bits_left = buf_bits - nblocks * block_size;
594  nb_samples = nblocks * 4096;
595  if (bits_left >= block_hdr_size)
596  nb_samples += 1 + (bits_left - block_hdr_size) / (nbits * ch);
597  break;
598  }
599  case AV_CODEC_ID_ADPCM_THP:
600  if (avctx->extradata) {
601  nb_samples = buf_size / (8 * ch) * 14;
602  break;
603  }
604  has_coded_samples = 1;
605  bytestream2_skip(gb, 4); // channel size
606  *coded_samples = bytestream2_get_be32(gb);
607  *coded_samples -= *coded_samples % 14;
608  nb_samples = (buf_size - (8 + 36 * ch)) / (8 * ch) * 14;
609  break;
610  case AV_CODEC_ID_ADPCM_AFC:
611  nb_samples = buf_size / (9 * ch) * 16;
612  break;
613  case AV_CODEC_ID_ADPCM_XA:
614  nb_samples = (buf_size / 128) * 224 / ch;
615  break;
616  case AV_CODEC_ID_ADPCM_DTK:
617  nb_samples = buf_size / (16 * ch) * 28;
618  break;
619  }
620 
621  /* validate coded sample count */
622  if (has_coded_samples && (*coded_samples <= 0 || *coded_samples > nb_samples))
623  return AVERROR_INVALIDDATA;
624 
625  return nb_samples;
626 }
627 
628 static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
629  int *got_frame_ptr, AVPacket *avpkt)
630 {
631  AVFrame *frame = data;
632  const uint8_t *buf = avpkt->data;
633  int buf_size = avpkt->size;
634  ADPCMDecodeContext *c = avctx->priv_data;
635  ADPCMChannelStatus *cs;
636  int n, m, channel, i;
637  short *samples;
638  int16_t **samples_p;
639  int st; /* stereo */
640  int count1, count2;
641  int nb_samples, coded_samples, ret;
642  GetByteContext gb;
643 
644  bytestream2_init(&gb, buf, buf_size);
645  nb_samples = get_nb_samples(avctx, &gb, buf_size, &coded_samples);
646  if (nb_samples <= 0) {
647  av_log(avctx, AV_LOG_ERROR, "invalid number of samples in packet\n");
648  return AVERROR_INVALIDDATA;
649  }
650 
651  /* get output buffer */
652  frame->nb_samples = nb_samples;
653  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
654  return ret;
655  samples = (short *)frame->data[0];
656  samples_p = (int16_t **)frame->extended_data;
657 
658  /* use coded_samples when applicable */
659  /* it is always <= nb_samples, so the output buffer will be large enough */
660  if (coded_samples) {
661  if (coded_samples != nb_samples)
662  av_log(avctx, AV_LOG_WARNING, "mismatch in coded sample count\n");
663  frame->nb_samples = nb_samples = coded_samples;
664  }
665 
666  st = avctx->channels == 2 ? 1 : 0;
667 
668  switch(avctx->codec->id) {
669  case AV_CODEC_ID_ADPCM_IMA_QT:
670  /* In QuickTime, IMA is encoded by chunks of 34 bytes (=64 samples).
671  Channel data is interleaved per-chunk. */
672  for (channel = 0; channel < avctx->channels; channel++) {
673  int predictor;
674  int step_index;
675  cs = &(c->status[channel]);
676  /* (pppppp) (piiiiiii) */
677 
678  /* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
679  predictor = sign_extend(bytestream2_get_be16u(&gb), 16);
680  step_index = predictor & 0x7F;
681  predictor &= ~0x7F;
682 
683  if (cs->step_index == step_index) {
684  int diff = predictor - cs->predictor;
685  if (diff < 0)
686  diff = - diff;
687  if (diff > 0x7f)
688  goto update;
689  } else {
690  update:
691  cs->step_index = step_index;
692  cs->predictor = predictor;
693  }
694 
695  if (cs->step_index > 88u){
696  av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
697  channel, cs->step_index);
698  return AVERROR_INVALIDDATA;
699  }
700 
701  samples = samples_p[channel];
702 
703  for (m = 0; m < 64; m += 2) {
704  int byte = bytestream2_get_byteu(&gb);
705  samples[m ] = adpcm_ima_qt_expand_nibble(cs, byte & 0x0F, 3);
706  samples[m + 1] = adpcm_ima_qt_expand_nibble(cs, byte >> 4 , 3);
707  }
708  }
709  break;
710  case AV_CODEC_ID_ADPCM_IMA_WAV:
711  for(i=0; i<avctx->channels; i++){
712  cs = &(c->status[i]);
713  cs->predictor = samples_p[i][0] = sign_extend(bytestream2_get_le16u(&gb), 16);
714 
715  cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
716  if (cs->step_index > 88u){
717  av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
718  i, cs->step_index);
719  return AVERROR_INVALIDDATA;
720  }
721  }
722 
723  for (n = 0; n < (nb_samples - 1) / 8; n++) {
724  for (i = 0; i < avctx->channels; i++) {
725  cs = &c->status[i];
726  samples = &samples_p[i][1 + n * 8];
727  for (m = 0; m < 8; m += 2) {
728  int v = bytestream2_get_byteu(&gb);
729  samples[m ] = adpcm_ima_expand_nibble(cs, v & 0x0F, 3);
730  samples[m + 1] = adpcm_ima_expand_nibble(cs, v >> 4 , 3);
731  }
732  }
733  }
734  break;
735  case AV_CODEC_ID_ADPCM_4XM:
736  for (i = 0; i < avctx->channels; i++)
737  c->status[i].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
738 
739  for (i = 0; i < avctx->channels; i++) {
740  c->status[i].step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
741  if (c->status[i].step_index > 88u) {
742  av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
743  i, c->status[i].step_index);
744  return AVERROR_INVALIDDATA;
745  }
746  }
747 
748  for (i = 0; i < avctx->channels; i++) {
749  samples = (int16_t *)frame->data[i];
750  cs = &c->status[i];
751  for (n = nb_samples >> 1; n > 0; n--) {
752  int v = bytestream2_get_byteu(&gb);
753  *samples++ = adpcm_ima_expand_nibble(cs, v & 0x0F, 4);
754  *samples++ = adpcm_ima_expand_nibble(cs, v >> 4 , 4);
755  }
756  }
757  break;
758  case AV_CODEC_ID_ADPCM_MS:
759  {
760  int block_predictor;
761 
762  block_predictor = bytestream2_get_byteu(&gb);
763  if (block_predictor > 6) {
764  av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[0] = %d\n",
765  block_predictor);
766  return AVERROR_INVALIDDATA;
767  }
768  c->status[0].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
769  c->status[0].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
770  if (st) {
771  block_predictor = bytestream2_get_byteu(&gb);
772  if (block_predictor > 6) {
773  av_log(avctx, AV_LOG_ERROR, "ERROR: block_predictor[1] = %d\n",
774  block_predictor);
775  return AVERROR_INVALIDDATA;
776  }
777  c->status[1].coeff1 = ff_adpcm_AdaptCoeff1[block_predictor];
778  c->status[1].coeff2 = ff_adpcm_AdaptCoeff2[block_predictor];
779  }
780  c->status[0].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);
781  if (st){
782  c->status[1].idelta = sign_extend(bytestream2_get_le16u(&gb), 16);
783  }
784 
785  c->status[0].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);
786  if (st) c->status[1].sample1 = sign_extend(bytestream2_get_le16u(&gb), 16);
787  c->status[0].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);
788  if (st) c->status[1].sample2 = sign_extend(bytestream2_get_le16u(&gb), 16);
789 
790  *samples++ = c->status[0].sample2;
791  if (st) *samples++ = c->status[1].sample2;
792  *samples++ = c->status[0].sample1;
793  if (st) *samples++ = c->status[1].sample1;
794  for(n = (nb_samples - 2) >> (1 - st); n > 0; n--) {
795  int byte = bytestream2_get_byteu(&gb);
796  *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], byte >> 4 );
797  *samples++ = adpcm_ms_expand_nibble(&c->status[st], byte & 0x0F);
798  }
799  break;
800  }
801  case AV_CODEC_ID_ADPCM_IMA_DK4:
802  for (channel = 0; channel < avctx->channels; channel++) {
803  cs = &c->status[channel];
804  cs->predictor = *samples++ = sign_extend(bytestream2_get_le16u(&gb), 16);
805  cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
806  if (cs->step_index > 88u){
807  av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
808  channel, cs->step_index);
809  return AVERROR_INVALIDDATA;
810  }
811  }
812  for (n = (nb_samples - 1) >> (1 - st); n > 0; n--) {
813  int v = bytestream2_get_byteu(&gb);
814  *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v >> 4 , 3);
815  *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
816  }
817  break;
818  case AV_CODEC_ID_ADPCM_IMA_DK3:
819  {
820  int last_byte = 0;
821  int nibble;
822  int decode_top_nibble_next = 0;
823  int diff_channel;
824  const int16_t *samples_end = samples + avctx->channels * nb_samples;
825 
826  bytestream2_skipu(&gb, 10);
827  c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
828  c->status[1].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
829  c->status[0].step_index = bytestream2_get_byteu(&gb);
830  c->status[1].step_index = bytestream2_get_byteu(&gb);
831  if (c->status[0].step_index > 88u || c->status[1].step_index > 88u){
832  av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i/%i\n",
833  c->status[0].step_index, c->status[1].step_index);
834  return AVERROR_INVALIDDATA;
835  }
836  /* sign extend the predictors */
837  diff_channel = c->status[1].predictor;
838 
839  /* DK3 ADPCM support macro */
840 #define DK3_GET_NEXT_NIBBLE() \
841  if (decode_top_nibble_next) { \
842  nibble = last_byte >> 4; \
843  decode_top_nibble_next = 0; \
844  } else { \
845  last_byte = bytestream2_get_byteu(&gb); \
846  nibble = last_byte & 0x0F; \
847  decode_top_nibble_next = 1; \
848  }
849 
850  while (samples < samples_end) {
851 
852  /* for this algorithm, c->status[0] is the sum channel and
853  * c->status[1] is the diff channel */
854 
855  /* process the first predictor of the sum channel */
856  DK3_GET_NEXT_NIBBLE();
857  adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
858 
859  /* process the diff channel predictor */
860  DK3_GET_NEXT_NIBBLE();
861  adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
862 
863  /* process the first pair of stereo PCM samples */
864  diff_channel = (diff_channel + c->status[1].predictor) / 2;
865  *samples++ = c->status[0].predictor + c->status[1].predictor;
866  *samples++ = c->status[0].predictor - c->status[1].predictor;
867 
868  /* process the second predictor of the sum channel */
869  DK3_GET_NEXT_NIBBLE();
870  adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
871 
872  /* process the second pair of stereo PCM samples */
873  diff_channel = (diff_channel + c->status[1].predictor) / 2;
874  *samples++ = c->status[0].predictor + c->status[1].predictor;
875  *samples++ = c->status[0].predictor - c->status[1].predictor;
876  }
877  break;
878  }
879  case AV_CODEC_ID_ADPCM_IMA_ISS:
880  for (channel = 0; channel < avctx->channels; channel++) {
881  cs = &c->status[channel];
882  cs->predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
883  cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
884  if (cs->step_index > 88u){
885  av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
886  channel, cs->step_index);
887  return AVERROR_INVALIDDATA;
888  }
889  }
890 
891  for (n = nb_samples >> (1 - st); n > 0; n--) {
892  int v1, v2;
893  int v = bytestream2_get_byteu(&gb);
894  /* nibbles are swapped for mono */
895  if (st) {
896  v1 = v >> 4;
897  v2 = v & 0x0F;
898  } else {
899  v2 = v >> 4;
900  v1 = v & 0x0F;
901  }
902  *samples++ = adpcm_ima_expand_nibble(&c->status[0 ], v1, 3);
903  *samples++ = adpcm_ima_expand_nibble(&c->status[st], v2, 3);
904  }
905  break;
906  case AV_CODEC_ID_ADPCM_IMA_APC:
907  while (bytestream2_get_bytes_left(&gb) > 0) {
908  int v = bytestream2_get_byteu(&gb);
909  *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4 , 3);
910  *samples++ = adpcm_ima_expand_nibble(&c->status[st], v & 0x0F, 3);
911  }
912  break;
913  case AV_CODEC_ID_ADPCM_IMA_OKI:
914  while (bytestream2_get_bytes_left(&gb) > 0) {
915  int v = bytestream2_get_byteu(&gb);
916  *samples++ = adpcm_ima_oki_expand_nibble(&c->status[0], v >> 4 );
917  *samples++ = adpcm_ima_oki_expand_nibble(&c->status[st], v & 0x0F);
918  }
919  break;
920  case AV_CODEC_ID_ADPCM_IMA_RAD:
921  for (channel = 0; channel < avctx->channels; channel++) {
922  cs = &c->status[channel];
923  cs->step_index = sign_extend(bytestream2_get_le16u(&gb), 16);
924  cs->predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
925  if (cs->step_index > 88u){
926  av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
927  channel, cs->step_index);
928  return AVERROR_INVALIDDATA;
929  }
930  }
931  for (n = 0; n < nb_samples / 2; n++) {
932  int byte[2];
933 
934  byte[0] = bytestream2_get_byteu(&gb);
935  if (st)
936  byte[1] = bytestream2_get_byteu(&gb);
937  for(channel = 0; channel < avctx->channels; channel++) {
938  *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] & 0x0F, 3);
939  }
940  for(channel = 0; channel < avctx->channels; channel++) {
941  *samples++ = adpcm_ima_expand_nibble(&c->status[channel], byte[channel] >> 4 , 3);
942  }
943  }
944  break;
945  case AV_CODEC_ID_ADPCM_IMA_WS:
946  if (c->vqa_version == 3) {
947  for (channel = 0; channel < avctx->channels; channel++) {
948  int16_t *smp = samples_p[channel];
949 
950  for (n = nb_samples / 2; n > 0; n--) {
951  int v = bytestream2_get_byteu(&gb);
952  *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4 , 3);
953  *smp++ = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);
954  }
955  }
956  } else {
957  for (n = nb_samples / 2; n > 0; n--) {
958  for (channel = 0; channel < avctx->channels; channel++) {
959  int v = bytestream2_get_byteu(&gb);
960  *samples++ = adpcm_ima_expand_nibble(&c->status[channel], v >> 4 , 3);
961  samples[st] = adpcm_ima_expand_nibble(&c->status[channel], v & 0x0F, 3);
962  }
963  samples += avctx->channels;
964  }
965  }
966  bytestream2_seek(&gb, 0, SEEK_END);
967  break;
968  case AV_CODEC_ID_ADPCM_XA:
969  {
970  int16_t *out0 = samples_p[0];
971  int16_t *out1 = samples_p[1];
972  int samples_per_block = 28 * (3 - avctx->channels) * 4;
973  int sample_offset = 0;
974  while (bytestream2_get_bytes_left(&gb) >= 128) {
975  if ((ret = xa_decode(avctx, out0, out1, buf + bytestream2_tell(&gb),
976  &c->status[0], &c->status[1],
977  avctx->channels, sample_offset)) < 0)
978  return ret;
979  bytestream2_skipu(&gb, 128);
980  sample_offset += samples_per_block;
981  }
982  break;
983  }
984  case AV_CODEC_ID_ADPCM_IMA_EA_EACS:
985  for (i=0; i<=st; i++) {
986  c->status[i].step_index = bytestream2_get_le32u(&gb);
987  if (c->status[i].step_index > 88u) {
988  av_log(avctx, AV_LOG_ERROR, "ERROR: step_index[%d] = %i\n",
989  i, c->status[i].step_index);
990  return AVERROR_INVALIDDATA;
991  }
992  }
993  for (i=0; i<=st; i++)
994  c->status[i].predictor = bytestream2_get_le32u(&gb);
995 
996  for (n = nb_samples >> (1 - st); n > 0; n--) {
997  int byte = bytestream2_get_byteu(&gb);
998  *samples++ = adpcm_ima_expand_nibble(&c->status[0], byte >> 4, 3);
999  *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 3);
1000  }
1001  break;
1002  case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:
1003  for (n = nb_samples >> (1 - st); n > 0; n--) {
1004  int byte = bytestream2_get_byteu(&gb);
1005  *samples++ = adpcm_ima_expand_nibble(&c->status[0], byte >> 4, 6);
1006  *samples++ = adpcm_ima_expand_nibble(&c->status[st], byte & 0x0F, 6);
1007  }
1008  break;
1009  case AV_CODEC_ID_ADPCM_EA:
1010  {
1011  int previous_left_sample, previous_right_sample;
1012  int current_left_sample, current_right_sample;
1013  int next_left_sample, next_right_sample;
1014  int coeff1l, coeff2l, coeff1r, coeff2r;
1015  int shift_left, shift_right;
1016 
1017  /* Each EA ADPCM frame has a 12-byte header followed by 30-byte pieces,
1018  each coding 28 stereo samples. */
1019 
1020  if(avctx->channels != 2)
1021  return AVERROR_INVALIDDATA;
1022 
1023  current_left_sample = sign_extend(bytestream2_get_le16u(&gb), 16);
1024  previous_left_sample = sign_extend(bytestream2_get_le16u(&gb), 16);
1025  current_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);
1026  previous_right_sample = sign_extend(bytestream2_get_le16u(&gb), 16);
1027 
1028  for (count1 = 0; count1 < nb_samples / 28; count1++) {
1029  int byte = bytestream2_get_byteu(&gb);
1030  coeff1l = ea_adpcm_table[ byte >> 4 ];
1031  coeff2l = ea_adpcm_table[(byte >> 4 ) + 4];
1032  coeff1r = ea_adpcm_table[ byte & 0x0F];
1033  coeff2r = ea_adpcm_table[(byte & 0x0F) + 4];
1034 
1035  byte = bytestream2_get_byteu(&gb);
1036  shift_left = 20 - (byte >> 4);
1037  shift_right = 20 - (byte & 0x0F);
1038 
1039  for (count2 = 0; count2 < 28; count2++) {
1040  byte = bytestream2_get_byteu(&gb);
1041  next_left_sample = sign_extend(byte >> 4, 4) << shift_left;
1042  next_right_sample = sign_extend(byte, 4) << shift_right;
1043 
1044  next_left_sample = (next_left_sample +
1045  (current_left_sample * coeff1l) +
1046  (previous_left_sample * coeff2l) + 0x80) >> 8;
1047  next_right_sample = (next_right_sample +
1048  (current_right_sample * coeff1r) +
1049  (previous_right_sample * coeff2r) + 0x80) >> 8;
1050 
1051  previous_left_sample = current_left_sample;
1052  current_left_sample = av_clip_int16(next_left_sample);
1053  previous_right_sample = current_right_sample;
1054  current_right_sample = av_clip_int16(next_right_sample);
1055  *samples++ = current_left_sample;
1056  *samples++ = current_right_sample;
1057  }
1058  }
1059 
1060  bytestream2_skip(&gb, 2); // Skip terminating 0x0000
1061 
1062  break;
1063  }
1064  case AV_CODEC_ID_ADPCM_EA_MAXIS_XA:
1065  {
1066  int coeff[2][2], shift[2];
1067 
1068  for(channel = 0; channel < avctx->channels; channel++) {
1069  int byte = bytestream2_get_byteu(&gb);
1070  for (i=0; i<2; i++)
1071  coeff[channel][i] = ea_adpcm_table[(byte >> 4) + 4*i];
1072  shift[channel] = 20 - (byte & 0x0F);
1073  }
1074  for (count1 = 0; count1 < nb_samples / 2; count1++) {
1075  int byte[2];
1076 
1077  byte[0] = bytestream2_get_byteu(&gb);
1078  if (st) byte[1] = bytestream2_get_byteu(&gb);
1079  for(i = 4; i >= 0; i-=4) { /* Pairwise samples LL RR (st) or LL LL (mono) */
1080  for(channel = 0; channel < avctx->channels; channel++) {
1081  int sample = sign_extend(byte[channel] >> i, 4) << shift[channel];
1082  sample = (sample +
1083  c->status[channel].sample1 * coeff[channel][0] +
1084  c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;
1085  c->status[channel].sample2 = c->status[channel].sample1;
1086  c->status[channel].sample1 = av_clip_int16(sample);
1087  *samples++ = c->status[channel].sample1;
1088  }
1089  }
1090  }
1091  bytestream2_seek(&gb, 0, SEEK_END);
1092  break;
1093  }
1094  case AV_CODEC_ID_ADPCM_EA_R1:
1095  case AV_CODEC_ID_ADPCM_EA_R2:
1096  case AV_CODEC_ID_ADPCM_EA_R3: {
1097  /* channel numbering
1098  2chan: 0=fl, 1=fr
1099  4chan: 0=fl, 1=rl, 2=fr, 3=rr
1100  6chan: 0=fl, 1=c, 2=fr, 3=rl, 4=rr, 5=sub */
1101  const int big_endian = avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R3;
1102  int previous_sample, current_sample, next_sample;
1103  int coeff1, coeff2;
1104  int shift;
1105  unsigned int channel;
1106  uint16_t *samplesC;
1107  int count = 0;
1108  int offsets[6];
1109 
1110  for (channel=0; channel<avctx->channels; channel++)
1111  offsets[channel] = (big_endian ? bytestream2_get_be32(&gb) :
1112  bytestream2_get_le32(&gb)) +
1113  (avctx->channels + 1) * 4;
1114 
1115  for (channel=0; channel<avctx->channels; channel++) {
1116  bytestream2_seek(&gb, offsets[channel], SEEK_SET);
1117  samplesC = samples_p[channel];
1118 
1119  if (avctx->codec->id == AV_CODEC_ID_ADPCM_EA_R1) {
1120  current_sample = sign_extend(bytestream2_get_le16(&gb), 16);
1121  previous_sample = sign_extend(bytestream2_get_le16(&gb), 16);
1122  } else {
1123  current_sample = c->status[channel].predictor;
1124  previous_sample = c->status[channel].prev_sample;
1125  }
1126 
1127  for (count1 = 0; count1 < nb_samples / 28; count1++) {
1128  int byte = bytestream2_get_byte(&gb);
1129  if (byte == 0xEE) { /* only seen in R2 and R3 */
1130  current_sample = sign_extend(bytestream2_get_be16(&gb), 16);
1131  previous_sample = sign_extend(bytestream2_get_be16(&gb), 16);
1132 
1133  for (count2=0; count2<28; count2++)
1134  *samplesC++ = sign_extend(bytestream2_get_be16(&gb), 16);
1135  } else {
1136  coeff1 = ea_adpcm_table[ byte >> 4 ];
1137  coeff2 = ea_adpcm_table[(byte >> 4) + 4];
1138  shift = 20 - (byte & 0x0F);
1139 
1140  for (count2=0; count2<28; count2++) {
1141  if (count2 & 1)
1142  next_sample = sign_extend(byte, 4) << shift;
1143  else {
1144  byte = bytestream2_get_byte(&gb);
1145  next_sample = sign_extend(byte >> 4, 4) << shift;
1146  }
1147 
1148  next_sample += (current_sample * coeff1) +
1149  (previous_sample * coeff2);
1150  next_sample = av_clip_int16(next_sample >> 8);
1151 
1152  previous_sample = current_sample;
1153  current_sample = next_sample;
1154  *samplesC++ = current_sample;
1155  }
1156  }
1157  }
1158  if (!count) {
1159  count = count1;
1160  } else if (count != count1) {
1161  av_log(avctx, AV_LOG_WARNING, "per-channel sample count mismatch\n");
1162  count = FFMAX(count, count1);
1163  }
1164 
1165  if (avctx->codec->id != AV_CODEC_ID_ADPCM_EA_R1) {
1166  c->status[channel].predictor = current_sample;
1167  c->status[channel].prev_sample = previous_sample;
1168  }
1169  }
1170 
1171  frame->nb_samples = count * 28;
1172  bytestream2_seek(&gb, 0, SEEK_END);
1173  break;
1174  }
1175  case AV_CODEC_ID_ADPCM_EA_XAS:
1176  for (channel=0; channel<avctx->channels; channel++) {
1177  int coeff[2][4], shift[4];
1178  int16_t *s = samples_p[channel];
1179  for (n = 0; n < 4; n++, s += 32) {
1180  int val = sign_extend(bytestream2_get_le16u(&gb), 16);
1181  for (i=0; i<2; i++)
1182  coeff[i][n] = ea_adpcm_table[(val&0x0F)+4*i];
1183  s[0] = val & ~0x0F;
1184 
1185  val = sign_extend(bytestream2_get_le16u(&gb), 16);
1186  shift[n] = 20 - (val & 0x0F);
1187  s[1] = val & ~0x0F;
1188  }
1189 
1190  for (m=2; m<32; m+=2) {
1191  s = &samples_p[channel][m];
1192  for (n = 0; n < 4; n++, s += 32) {
1193  int level, pred;
1194  int byte = bytestream2_get_byteu(&gb);
1195 
1196  level = sign_extend(byte >> 4, 4) << shift[n];
1197  pred = s[-1] * coeff[0][n] + s[-2] * coeff[1][n];
1198  s[0] = av_clip_int16((level + pred + 0x80) >> 8);
1199 
1200  level = sign_extend(byte, 4) << shift[n];
1201  pred = s[0] * coeff[0][n] + s[-1] * coeff[1][n];
1202  s[1] = av_clip_int16((level + pred + 0x80) >> 8);
1203  }
1204  }
1205  }
1206  break;
1207  case AV_CODEC_ID_ADPCM_IMA_AMV:
1208  c->status[0].predictor = sign_extend(bytestream2_get_le16u(&gb), 16);
1209  c->status[0].step_index = bytestream2_get_le16u(&gb);
1210  bytestream2_skipu(&gb, 4);
1211  if (c->status[0].step_index > 88u) {
1212  av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",
1213  c->status[0].step_index);
1214  return AVERROR_INVALIDDATA;
1215  }
1216 
1217  for (n = nb_samples >> (1 - st); n > 0; n--) {
1218  int v = bytestream2_get_byteu(&gb);
1219 
1220  *samples++ = adpcm_ima_expand_nibble(&c->status[0], v >> 4, 3);
1221  *samples++ = adpcm_ima_expand_nibble(&c->status[0], v & 0xf, 3);
1222  }
1223  break;
1224  case AV_CODEC_ID_ADPCM_IMA_SMJPEG:
1225  for (i = 0; i < avctx->channels; i++) {
1226  c->status[i].predictor = sign_extend(bytestream2_get_be16u(&gb), 16);
1227  c->status[i].step_index = bytestream2_get_byteu(&gb);
1228  bytestream2_skipu(&gb, 1);
1229  if (c->status[i].step_index > 88u) {
1230  av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n",
1231  c->status[i].step_index);
1232  return AVERROR_INVALIDDATA;
1233  }
1234  }
1235 
1236  for (n = nb_samples >> (1 - st); n > 0; n--) {
1237  int v = bytestream2_get_byteu(&gb);
1238 
1239  *samples++ = adpcm_ima_qt_expand_nibble(&c->status[0 ], v >> 4, 3);
1240  *samples++ = adpcm_ima_qt_expand_nibble(&c->status[st], v & 0xf, 3);
1241  }
1242  break;
1243  case AV_CODEC_ID_ADPCM_CT:
1244  for (n = nb_samples >> (1 - st); n > 0; n--) {
1245  int v = bytestream2_get_byteu(&gb);
1246  *samples++ = adpcm_ct_expand_nibble(&c->status[0 ], v >> 4 );
1247  *samples++ = adpcm_ct_expand_nibble(&c->status[st], v & 0x0F);
1248  }
1249  break;
1250  case AV_CODEC_ID_ADPCM_SBPRO_4:
1251  case AV_CODEC_ID_ADPCM_SBPRO_3:
1252  case AV_CODEC_ID_ADPCM_SBPRO_2:
1253  if (!c->status[0].step_index) {
1254  /* the first byte is a raw sample */
1255  *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);
1256  if (st)
1257  *samples++ = 128 * (bytestream2_get_byteu(&gb) - 0x80);
1258  c->status[0].step_index = 1;
1259  nb_samples--;
1260  }
1261  if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_4) {
1262  for (n = nb_samples >> (1 - st); n > 0; n--) {
1263  int byte = bytestream2_get_byteu(&gb);
1264  *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1265  byte >> 4, 4, 0);
1266  *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1267  byte & 0x0F, 4, 0);
1268  }
1269  } else if (avctx->codec->id == AV_CODEC_ID_ADPCM_SBPRO_3) {
1270  for (n = nb_samples / 3; n > 0; n--) {
1271  int byte = bytestream2_get_byteu(&gb);
1272  *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1273  byte >> 5 , 3, 0);
1274  *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1275  (byte >> 2) & 0x07, 3, 0);
1276  *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1277  byte & 0x03, 2, 0);
1278  }
1279  } else {
1280  for (n = nb_samples >> (2 - st); n > 0; n--) {
1281  int byte = bytestream2_get_byteu(&gb);
1282  *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1283  byte >> 6 , 2, 2);
1284  *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1285  (byte >> 4) & 0x03, 2, 2);
1286  *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
1287  (byte >> 2) & 0x03, 2, 2);
1288  *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
1289  byte & 0x03, 2, 2);
1290  }
1291  }
1292  break;
1293  case AV_CODEC_ID_ADPCM_SWF:
1294  adpcm_swf_decode(avctx, buf, buf_size, samples);
1295  bytestream2_seek(&gb, 0, SEEK_END);
1296  break;
1297  case AV_CODEC_ID_ADPCM_YAMAHA:
1298  for (n = nb_samples >> (1 - st); n > 0; n--) {
1299  int v = bytestream2_get_byteu(&gb);
1300  *samples++ = adpcm_yamaha_expand_nibble(&c->status[0 ], v & 0x0F);
1301  *samples++ = adpcm_yamaha_expand_nibble(&c->status[st], v >> 4 );
1302  }
1303  break;
1304  case AV_CODEC_ID_ADPCM_AFC:
1305  {
1306  int samples_per_block;
1307  int blocks;
1308 
1309  if (avctx->extradata && avctx->extradata_size == 1 && avctx->extradata[0]) {
1310  samples_per_block = avctx->extradata[0] / 16;
1311  blocks = nb_samples / avctx->extradata[0];
1312  } else {
1313  samples_per_block = nb_samples / 16;
1314  blocks = 1;
1315  }
1316 
1317  for (m = 0; m < blocks; m++) {
1318  for (channel = 0; channel < avctx->channels; channel++) {
1319  int prev1 = c->status[channel].sample1;
1320  int prev2 = c->status[channel].sample2;
1321 
1322  samples = samples_p[channel] + m * 16;
1323  /* Read in every sample for this channel. */
1324  for (i = 0; i < samples_per_block; i++) {
1325  int byte = bytestream2_get_byteu(&gb);
1326  int scale = 1 << (byte >> 4);
1327  int index = byte & 0xf;
1328  int factor1 = ff_adpcm_afc_coeffs[0][index];
1329  int factor2 = ff_adpcm_afc_coeffs[1][index];
1330 
1331  /* Decode 16 samples. */
1332  for (n = 0; n < 16; n++) {
1333  int32_t sampledat;
1334 
1335  if (n & 1) {
1336  sampledat = sign_extend(byte, 4);
1337  } else {
1338  byte = bytestream2_get_byteu(&gb);
1339  sampledat = sign_extend(byte >> 4, 4);
1340  }
1341 
1342  sampledat = ((prev1 * factor1 + prev2 * factor2) +
1343  ((sampledat * scale) << 11)) >> 11;
1344  *samples = av_clip_int16(sampledat);
1345  prev2 = prev1;
1346  prev1 = *samples++;
1347  }
1348  }
1349 
1350  c->status[channel].sample1 = prev1;
1351  c->status[channel].sample2 = prev2;
1352  }
1353  }
1354  bytestream2_seek(&gb, 0, SEEK_END);
1355  break;
1356  }
1357  case AV_CODEC_ID_ADPCM_THP:
1358  {
1359  int table[6][16];
1360  int ch;
1361 
1362  if (avctx->extradata) {
1363  GetByteContext tb;
1364  if (avctx->extradata_size < 32 * avctx->channels) {
1365  av_log(avctx, AV_LOG_ERROR, "Missing coeff table\n");
1366  return AVERROR_INVALIDDATA;
1367  }
1368 
1369  bytestream2_init(&tb, avctx->extradata, avctx->extradata_size);
1370  for (i = 0; i < avctx->channels; i++)
1371  for (n = 0; n < 16; n++)
1372  table[i][n] = sign_extend(bytestream2_get_be16u(&tb), 16);
1373  } else {
1374  for (i = 0; i < avctx->channels; i++)
1375  for (n = 0; n < 16; n++)
1376  table[i][n] = sign_extend(bytestream2_get_be16u(&gb), 16);
1377 
1378  /* Initialize the previous sample. */
1379  for (i = 0; i < avctx->channels; i++) {
1380  c->status[i].sample1 = sign_extend(bytestream2_get_be16u(&gb), 16);
1381  c->status[i].sample2 = sign_extend(bytestream2_get_be16u(&gb), 16);
1382  }
1383  }
1384 
1385  for (ch = 0; ch < avctx->channels; ch++) {
1386  samples = samples_p[ch];
1387 
1388  /* Read in every sample for this channel. */
1389  for (i = 0; i < nb_samples / 14; i++) {
1390  int byte = bytestream2_get_byteu(&gb);
1391  int index = (byte >> 4) & 7;
1392  unsigned int exp = byte & 0x0F;
1393  int factor1 = table[ch][index * 2];
1394  int factor2 = table[ch][index * 2 + 1];
1395 
1396  /* Decode 14 samples. */
1397  for (n = 0; n < 14; n++) {
1398  int32_t sampledat;
1399 
1400  if (n & 1) {
1401  sampledat = sign_extend(byte, 4);
1402  } else {
1403  byte = bytestream2_get_byteu(&gb);
1404  sampledat = sign_extend(byte >> 4, 4);
1405  }
1406 
1407  sampledat = ((c->status[ch].sample1 * factor1
1408  + c->status[ch].sample2 * factor2) >> 11) + (sampledat << exp);
1409  *samples = av_clip_int16(sampledat);
1410  c->status[ch].sample2 = c->status[ch].sample1;
1411  c->status[ch].sample1 = *samples++;
1412  }
1413  }
1414  }
1415  break;
1416  }
1417  case AV_CODEC_ID_ADPCM_DTK:
1418  for (channel = 0; channel < avctx->channels; channel++) {
1419  samples = samples_p[channel];
1420 
1421  /* Read in every sample for this channel. */
1422  for (i = 0; i < nb_samples / 28; i++) {
1423  int byte, header;
1424  if (channel)
1425  bytestream2_skipu(&gb, 1);
1426  header = bytestream2_get_byteu(&gb);
1427  bytestream2_skipu(&gb, 3 - channel);
1428 
1429  /* Decode 28 samples. */
1430  for (n = 0; n < 28; n++) {
1431  int32_t sampledat, prev;
1432 
1433  switch (header >> 4) {
1434  case 1:
1435  prev = (c->status[channel].sample1 * 0x3c);
1436  break;
1437  case 2:
1438  prev = (c->status[channel].sample1 * 0x73) - (c->status[channel].sample2 * 0x34);
1439  break;
1440  case 3:
1441  prev = (c->status[channel].sample1 * 0x62) - (c->status[channel].sample2 * 0x37);
1442  break;
1443  default:
1444  prev = 0;
1445  }
1446 
1447  prev = av_clip((prev + 0x20) >> 6, -0x200000, 0x1fffff);
1448 
1449  byte = bytestream2_get_byteu(&gb);
1450  if (!channel)
1451  sampledat = sign_extend(byte, 4);
1452  else
1453  sampledat = sign_extend(byte >> 4, 4);
1454 
1455  sampledat = (((sampledat << 12) >> (header & 0xf)) << 6) + prev;
1456  *samples++ = av_clip_int16(sampledat >> 6);
1457  c->status[channel].sample2 = c->status[channel].sample1;
1458  c->status[channel].sample1 = sampledat;
1459  }
1460  }
1461  if (!channel)
1462  bytestream2_seek(&gb, 0, SEEK_SET);
1463  }
1464  break;
1465 
1466  default:
1467  return -1;
1468  }
1469 
1470  if (avpkt->size && bytestream2_tell(&gb) == 0) {
1471  av_log(avctx, AV_LOG_ERROR, "Nothing consumed\n");
1472  return AVERROR_INVALIDDATA;
1473  }
1474 
1475  *got_frame_ptr = 1;
1476 
1477  return bytestream2_tell(&gb);
1478 }
1479 
1480 
1481 static const enum AVSampleFormat sample_fmts_s16[] = { AV_SAMPLE_FMT_S16,
1482  AV_SAMPLE_FMT_NONE };
1483 static const enum AVSampleFormat sample_fmts_s16p[] = { AV_SAMPLE_FMT_S16,
1484  AV_SAMPLE_FMT_NONE };
1485 static const enum AVSampleFormat sample_fmts_both[] = { AV_SAMPLE_FMT_S16,
1486  AV_SAMPLE_FMT_S16P,
1487  AV_SAMPLE_FMT_NONE };
1488 
1489 #define ADPCM_DECODER(id_, sample_fmts_, name_, long_name_) \
1490 AVCodec ff_ ## name_ ## _decoder = { \
1491  .name = #name_, \
1492  .type = AVMEDIA_TYPE_AUDIO, \
1493  .id = id_, \
1494  .priv_data_size = sizeof(ADPCMDecodeContext), \
1495  .init = adpcm_decode_init, \
1496  .decode = adpcm_decode_frame, \
1497  .capabilities = CODEC_CAP_DR1, \
1498  .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
1499  .sample_fmts = sample_fmts_, \
1500 }
1501 
1502 /* Note: Do not forget to add new entries to the Makefile as well. */
1503 ADPCM_DECODER(AV_CODEC_ID_ADPCM_4XM, sample_fmts_s16p, adpcm_4xm, "ADPCM 4X Movie");
1504 ADPCM_DECODER(AV_CODEC_ID_ADPCM_AFC, sample_fmts_s16p, adpcm_afc, "ADPCM Nintendo Gamecube AFC");
1505 ADPCM_DECODER(AV_CODEC_ID_ADPCM_CT, sample_fmts_s16, adpcm_ct, "ADPCM Creative Technology");
1506 ADPCM_DECODER(AV_CODEC_ID_ADPCM_DTK, sample_fmts_s16p, adpcm_dtk, "ADPCM Nintendo Gamecube DTK");
1507 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA, sample_fmts_s16, adpcm_ea, "ADPCM Electronic Arts");
1508 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_MAXIS_XA, sample_fmts_s16, adpcm_ea_maxis_xa, "ADPCM Electronic Arts Maxis CDROM XA");
1509 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R1, sample_fmts_s16p, adpcm_ea_r1, "ADPCM Electronic Arts R1");
1510 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R2, sample_fmts_s16p, adpcm_ea_r2, "ADPCM Electronic Arts R2");
1511 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_R3, sample_fmts_s16p, adpcm_ea_r3, "ADPCM Electronic Arts R3");
1512 ADPCM_DECODER(AV_CODEC_ID_ADPCM_EA_XAS, sample_fmts_s16p, adpcm_ea_xas, "ADPCM Electronic Arts XAS");
1513 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_AMV, sample_fmts_s16, adpcm_ima_amv, "ADPCM IMA AMV");
1514 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_APC, sample_fmts_s16, adpcm_ima_apc, "ADPCM IMA CRYO APC");
1515 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK3, sample_fmts_s16, adpcm_ima_dk3, "ADPCM IMA Duck DK3");
1516 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_DK4, sample_fmts_s16, adpcm_ima_dk4, "ADPCM IMA Duck DK4");
1517 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_EACS, sample_fmts_s16, adpcm_ima_ea_eacs, "ADPCM IMA Electronic Arts EACS");
1518 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_EA_SEAD, sample_fmts_s16, adpcm_ima_ea_sead, "ADPCM IMA Electronic Arts SEAD");
1519 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_ISS, sample_fmts_s16, adpcm_ima_iss, "ADPCM IMA Funcom ISS");
1520 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_OKI, sample_fmts_s16, adpcm_ima_oki, "ADPCM IMA Dialogic OKI");
1521 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_QT, sample_fmts_s16p, adpcm_ima_qt, "ADPCM IMA QuickTime");
1522 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_RAD, sample_fmts_s16, adpcm_ima_rad, "ADPCM IMA Radical");
1523 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_SMJPEG, sample_fmts_s16, adpcm_ima_smjpeg, "ADPCM IMA Loki SDL MJPEG");
1524 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WAV, sample_fmts_s16p, adpcm_ima_wav, "ADPCM IMA WAV");
1525 ADPCM_DECODER(AV_CODEC_ID_ADPCM_IMA_WS, sample_fmts_both, adpcm_ima_ws, "ADPCM IMA Westwood");
1526 ADPCM_DECODER(AV_CODEC_ID_ADPCM_MS, sample_fmts_s16, adpcm_ms, "ADPCM Microsoft");
1527 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_2, sample_fmts_s16, adpcm_sbpro_2, "ADPCM Sound Blaster Pro 2-bit");
1528 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_3, sample_fmts_s16, adpcm_sbpro_3, "ADPCM Sound Blaster Pro 2.6-bit");
1529 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SBPRO_4, sample_fmts_s16, adpcm_sbpro_4, "ADPCM Sound Blaster Pro 4-bit");
1530 ADPCM_DECODER(AV_CODEC_ID_ADPCM_SWF, sample_fmts_s16, adpcm_swf, "ADPCM Shockwave Flash");
1531 ADPCM_DECODER(AV_CODEC_ID_ADPCM_THP, sample_fmts_s16p, adpcm_thp, "ADPCM Nintendo Gamecube THP");
1532 ADPCM_DECODER(AV_CODEC_ID_ADPCM_XA, sample_fmts_s16p, adpcm_xa, "ADPCM CDROM XA");
1533 ADPCM_DECODER(AV_CODEC_ID_ADPCM_YAMAHA, sample_fmts_s16, adpcm_yamaha, "ADPCM Yamaha");
Generated on Wed Jun 19 2013 19:20:45 for FFmpeg by   doxygen 1.8.2