Libav
takdec.c
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1 /*
2  * TAK decoder
3  * Copyright (c) 2012 Paul B Mahol
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
28 #include "libavutil/internal.h"
29 #include "libavutil/samplefmt.h"
30 #include "tak.h"
31 #include "audiodsp.h"
32 #include "avcodec.h"
33 #include "internal.h"
34 #include "unary.h"
35 
36 #define MAX_SUBFRAMES 8 // max number of subframes per channel
37 #define MAX_PREDICTORS 256
38 
39 typedef struct MCDParam {
40  int8_t present; // decorrelation parameter availability for this channel
41  int8_t index; // index into array of decorrelation types
42  int8_t chan1;
43  int8_t chan2;
44 } MCDParam;
45 
46 typedef struct TAKDecContext {
47  AVCodecContext *avctx; // parent AVCodecContext
50  GetBitContext gb; // bitstream reader initialized to start at the current frame
51 
52  int uval;
53  int nb_samples; // number of samples in the current frame
55  unsigned int decode_buffer_size;
56  int32_t *decoded[TAK_MAX_CHANNELS]; // decoded samples for each channel
57 
59  int8_t sample_shift[TAK_MAX_CHANNELS]; // shift applied to every sample in the channel
61 
62  int8_t dmode; // channel decorrelation type in the current frame
63 
64  MCDParam mcdparams[TAK_MAX_CHANNELS]; // multichannel decorrelation parameters
65 
66  int16_t *residues;
67  unsigned int residues_buf_size;
69 
70 static const int8_t mc_dmodes[] = { 1, 3, 4, 6, };
71 
72 static const uint16_t predictor_sizes[] = {
73  4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0,
74 };
75 
76 static const struct CParam {
77  int init;
78  int escape;
79  int scale;
80  int aescape;
81  int bias;
82 } xcodes[50] = {
83  { 0x01, 0x0000001, 0x0000001, 0x0000003, 0x0000008 },
84  { 0x02, 0x0000003, 0x0000001, 0x0000007, 0x0000006 },
85  { 0x03, 0x0000005, 0x0000002, 0x000000E, 0x000000D },
86  { 0x03, 0x0000003, 0x0000003, 0x000000D, 0x0000018 },
87  { 0x04, 0x000000B, 0x0000004, 0x000001C, 0x0000019 },
88  { 0x04, 0x0000006, 0x0000006, 0x000001A, 0x0000030 },
89  { 0x05, 0x0000016, 0x0000008, 0x0000038, 0x0000032 },
90  { 0x05, 0x000000C, 0x000000C, 0x0000034, 0x0000060 },
91  { 0x06, 0x000002C, 0x0000010, 0x0000070, 0x0000064 },
92  { 0x06, 0x0000018, 0x0000018, 0x0000068, 0x00000C0 },
93  { 0x07, 0x0000058, 0x0000020, 0x00000E0, 0x00000C8 },
94  { 0x07, 0x0000030, 0x0000030, 0x00000D0, 0x0000180 },
95  { 0x08, 0x00000B0, 0x0000040, 0x00001C0, 0x0000190 },
96  { 0x08, 0x0000060, 0x0000060, 0x00001A0, 0x0000300 },
97  { 0x09, 0x0000160, 0x0000080, 0x0000380, 0x0000320 },
98  { 0x09, 0x00000C0, 0x00000C0, 0x0000340, 0x0000600 },
99  { 0x0A, 0x00002C0, 0x0000100, 0x0000700, 0x0000640 },
100  { 0x0A, 0x0000180, 0x0000180, 0x0000680, 0x0000C00 },
101  { 0x0B, 0x0000580, 0x0000200, 0x0000E00, 0x0000C80 },
102  { 0x0B, 0x0000300, 0x0000300, 0x0000D00, 0x0001800 },
103  { 0x0C, 0x0000B00, 0x0000400, 0x0001C00, 0x0001900 },
104  { 0x0C, 0x0000600, 0x0000600, 0x0001A00, 0x0003000 },
105  { 0x0D, 0x0001600, 0x0000800, 0x0003800, 0x0003200 },
106  { 0x0D, 0x0000C00, 0x0000C00, 0x0003400, 0x0006000 },
107  { 0x0E, 0x0002C00, 0x0001000, 0x0007000, 0x0006400 },
108  { 0x0E, 0x0001800, 0x0001800, 0x0006800, 0x000C000 },
109  { 0x0F, 0x0005800, 0x0002000, 0x000E000, 0x000C800 },
110  { 0x0F, 0x0003000, 0x0003000, 0x000D000, 0x0018000 },
111  { 0x10, 0x000B000, 0x0004000, 0x001C000, 0x0019000 },
112  { 0x10, 0x0006000, 0x0006000, 0x001A000, 0x0030000 },
113  { 0x11, 0x0016000, 0x0008000, 0x0038000, 0x0032000 },
114  { 0x11, 0x000C000, 0x000C000, 0x0034000, 0x0060000 },
115  { 0x12, 0x002C000, 0x0010000, 0x0070000, 0x0064000 },
116  { 0x12, 0x0018000, 0x0018000, 0x0068000, 0x00C0000 },
117  { 0x13, 0x0058000, 0x0020000, 0x00E0000, 0x00C8000 },
118  { 0x13, 0x0030000, 0x0030000, 0x00D0000, 0x0180000 },
119  { 0x14, 0x00B0000, 0x0040000, 0x01C0000, 0x0190000 },
120  { 0x14, 0x0060000, 0x0060000, 0x01A0000, 0x0300000 },
121  { 0x15, 0x0160000, 0x0080000, 0x0380000, 0x0320000 },
122  { 0x15, 0x00C0000, 0x00C0000, 0x0340000, 0x0600000 },
123  { 0x16, 0x02C0000, 0x0100000, 0x0700000, 0x0640000 },
124  { 0x16, 0x0180000, 0x0180000, 0x0680000, 0x0C00000 },
125  { 0x17, 0x0580000, 0x0200000, 0x0E00000, 0x0C80000 },
126  { 0x17, 0x0300000, 0x0300000, 0x0D00000, 0x1800000 },
127  { 0x18, 0x0B00000, 0x0400000, 0x1C00000, 0x1900000 },
128  { 0x18, 0x0600000, 0x0600000, 0x1A00000, 0x3000000 },
129  { 0x19, 0x1600000, 0x0800000, 0x3800000, 0x3200000 },
130  { 0x19, 0x0C00000, 0x0C00000, 0x3400000, 0x6000000 },
131  { 0x1A, 0x2C00000, 0x1000000, 0x7000000, 0x6400000 },
132  { 0x1A, 0x1800000, 0x1800000, 0x6800000, 0xC000000 },
133 };
134 
136 {
137  ff_tak_init_crc();
138 }
139 
140 static int set_bps_params(AVCodecContext *avctx)
141 {
142  switch (avctx->bits_per_coded_sample) {
143  case 8:
144  avctx->sample_fmt = AV_SAMPLE_FMT_U8P;
145  break;
146  case 16:
148  break;
149  case 24:
151  break;
152  default:
153  av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample: %d\n",
154  avctx->bits_per_coded_sample);
155  return AVERROR_INVALIDDATA;
156  }
158 
159  return 0;
160 }
161 
163 {
164  TAKDecContext *s = avctx->priv_data;
165  int shift = 3 - (avctx->sample_rate / 11025);
166  shift = FFMAX(0, shift);
167  s->uval = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << shift;
168  s->subframe_scale = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << 1;
169 }
170 
172 {
173  TAKDecContext *s = avctx->priv_data;
174 
175  ff_audiodsp_init(&s->adsp);
176 
177  s->avctx = avctx;
178 
179  set_sample_rate_params(avctx);
180 
181  return set_bps_params(avctx);
182 }
183 
184 static void decode_lpc(int32_t *coeffs, int mode, int length)
185 {
186  int i;
187 
188  if (length < 2)
189  return;
190 
191  if (mode == 1) {
192  int a1 = *coeffs++;
193  for (i = 0; i < length - 1 >> 1; i++) {
194  *coeffs += a1;
195  coeffs[1] += *coeffs;
196  a1 = coeffs[1];
197  coeffs += 2;
198  }
199  if (length - 1 & 1)
200  *coeffs += a1;
201  } else if (mode == 2) {
202  int a1 = coeffs[1];
203  int a2 = a1 + *coeffs;
204  coeffs[1] = a2;
205  if (length > 2) {
206  coeffs += 2;
207  for (i = 0; i < length - 2 >> 1; i++) {
208  int a3 = *coeffs + a1;
209  int a4 = a3 + a2;
210  *coeffs = a4;
211  a1 = coeffs[1] + a3;
212  a2 = a1 + a4;
213  coeffs[1] = a2;
214  coeffs += 2;
215  }
216  if (length & 1)
217  *coeffs += a1 + a2;
218  }
219  } else if (mode == 3) {
220  int a1 = coeffs[1];
221  int a2 = a1 + *coeffs;
222  coeffs[1] = a2;
223  if (length > 2) {
224  int a3 = coeffs[2];
225  int a4 = a3 + a1;
226  int a5 = a4 + a2;
227  coeffs += 3;
228  for (i = 0; i < length - 3; i++) {
229  a3 += *coeffs;
230  a4 += a3;
231  a5 += a4;
232  *coeffs = a5;
233  coeffs++;
234  }
235  }
236  }
237 }
238 
239 static int decode_segment(GetBitContext *gb, int mode, int32_t *decoded,
240  int len)
241 {
242  struct CParam code;
243  int i;
244 
245  if (!mode) {
246  memset(decoded, 0, len * sizeof(*decoded));
247  return 0;
248  }
249 
250  if (mode > FF_ARRAY_ELEMS(xcodes))
251  return AVERROR_INVALIDDATA;
252  code = xcodes[mode - 1];
253 
254  for (i = 0; i < len; i++) {
255  int x = get_bits_long(gb, code.init);
256  if (x >= code.escape && get_bits1(gb)) {
257  x |= 1 << code.init;
258  if (x >= code.aescape) {
259  int scale = get_unary(gb, 1, 9);
260  if (scale == 9) {
261  int scale_bits = get_bits(gb, 3);
262  if (scale_bits > 0) {
263  if (scale_bits == 7) {
264  scale_bits += get_bits(gb, 5);
265  if (scale_bits > 29)
266  return AVERROR_INVALIDDATA;
267  }
268  scale = get_bits_long(gb, scale_bits) + 1;
269  x += code.scale * scale;
270  }
271  x += code.bias;
272  } else
273  x += code.scale * scale - code.escape;
274  } else
275  x -= code.escape;
276  }
277  decoded[i] = (x >> 1) ^ -(x & 1);
278  }
279 
280  return 0;
281 }
282 
283 static int decode_residues(TAKDecContext *s, int32_t *decoded, int length)
284 {
285  GetBitContext *gb = &s->gb;
286  int i, mode, ret;
287 
288  if (length > s->nb_samples)
289  return AVERROR_INVALIDDATA;
290 
291  if (get_bits1(gb)) {
292  int wlength, rval;
293  int coding_mode[128];
294 
295  wlength = length / s->uval;
296 
297  rval = length - (wlength * s->uval);
298 
299  if (rval < s->uval / 2)
300  rval += s->uval;
301  else
302  wlength++;
303 
304  if (wlength <= 1 || wlength > 128)
305  return AVERROR_INVALIDDATA;
306 
307  coding_mode[0] = mode = get_bits(gb, 6);
308 
309  for (i = 1; i < wlength; i++) {
310  int c = get_unary(gb, 1, 6);
311 
312  switch (c) {
313  case 6:
314  mode = get_bits(gb, 6);
315  break;
316  case 5:
317  case 4:
318  case 3: {
319  /* mode += sign ? (1 - c) : (c - 1) */
320  int sign = get_bits1(gb);
321  mode += (-sign ^ (c - 1)) + sign;
322  break;
323  }
324  case 2:
325  mode++;
326  break;
327  case 1:
328  mode--;
329  break;
330  }
331  coding_mode[i] = mode;
332  }
333 
334  i = 0;
335  while (i < wlength) {
336  int len = 0;
337 
338  mode = coding_mode[i];
339  do {
340  if (i >= wlength - 1)
341  len += rval;
342  else
343  len += s->uval;
344  i++;
345 
346  if (i == wlength)
347  break;
348  } while (coding_mode[i] == mode);
349 
350  if ((ret = decode_segment(gb, mode, decoded, len)) < 0)
351  return ret;
352  decoded += len;
353  }
354  } else {
355  mode = get_bits(gb, 6);
356  if ((ret = decode_segment(gb, mode, decoded, length)) < 0)
357  return ret;
358  }
359 
360  return 0;
361 }
362 
364 {
365  if (get_bits1(gb))
366  return get_bits(gb, 4) + 1;
367  else
368  return 0;
369 }
370 
371 static void decode_filter_coeffs(TAKDecContext *s, int filter_order, int size,
372  int filter_quant, int16_t *filter)
373 {
374  GetBitContext *gb = &s->gb;
375  int i, j, a, b;
376  int filter_tmp[MAX_PREDICTORS];
377  int16_t predictors[MAX_PREDICTORS];
378 
379  predictors[0] = get_sbits(gb, 10);
380  predictors[1] = get_sbits(gb, 10);
381  predictors[2] = get_sbits(gb, size) << (10 - size);
382  predictors[3] = get_sbits(gb, size) << (10 - size);
383  if (filter_order > 4) {
384  int av_uninit(code_size);
385  int code_size_base = size - get_bits1(gb);
386 
387  for (i = 4; i < filter_order; i++) {
388  if (!(i & 3))
389  code_size = code_size_base - get_bits(gb, 2);
390  predictors[i] = get_sbits(gb, code_size) << (10 - size);
391  }
392  }
393 
394  filter_tmp[0] = predictors[0] << 6;
395  for (i = 1; i < filter_order; i++) {
396  int *p1 = &filter_tmp[0];
397  int *p2 = &filter_tmp[i - 1];
398 
399  for (j = 0; j < (i + 1) / 2; j++) {
400  int tmp = *p1 + (predictors[i] * *p2 + 256 >> 9);
401  *p2 = *p2 + (predictors[i] * *p1 + 256 >> 9);
402  *p1 = tmp;
403  p1++;
404  p2--;
405  }
406 
407  filter_tmp[i] = predictors[i] << 6;
408  }
409 
410  a = 1 << (32 - (15 - filter_quant));
411  b = 1 << ((15 - filter_quant) - 1);
412  for (i = 0, j = filter_order - 1; i < filter_order / 2; i++, j--) {
413  filter[j] = a - ((filter_tmp[i] + b) >> (15 - filter_quant));
414  filter[i] = a - ((filter_tmp[j] + b) >> (15 - filter_quant));
415  }
416 }
417 
418 static int decode_subframe(TAKDecContext *s, int32_t *decoded,
419  int subframe_size, int prev_subframe_size)
420 {
422  GetBitContext *gb = &s->gb;
423  int i, ret;
424  int dshift, size, filter_quant, filter_order;
425 
426  memset(filter, 0, MAX_PREDICTORS * sizeof(*filter));
427 
428  if (!get_bits1(gb))
429  return decode_residues(s, decoded, subframe_size);
430 
431  filter_order = predictor_sizes[get_bits(gb, 4)];
432 
433  if (prev_subframe_size > 0 && get_bits1(gb)) {
434  if (filter_order > prev_subframe_size)
435  return AVERROR_INVALIDDATA;
436 
437  decoded -= filter_order;
438  subframe_size += filter_order;
439 
440  if (filter_order > subframe_size)
441  return AVERROR_INVALIDDATA;
442  } else {
443  int lpc_mode;
444 
445  if (filter_order > subframe_size)
446  return AVERROR_INVALIDDATA;
447 
448  lpc_mode = get_bits(gb, 2);
449  if (lpc_mode > 2)
450  return AVERROR_INVALIDDATA;
451 
452  if ((ret = decode_residues(s, decoded, filter_order)) < 0)
453  return ret;
454 
455  if (lpc_mode)
456  decode_lpc(decoded, lpc_mode, filter_order);
457  }
458 
459  dshift = get_bits_esc4(gb);
460  size = get_bits1(gb) + 6;
461 
462  filter_quant = 10;
463  if (get_bits1(gb)) {
464  filter_quant -= get_bits(gb, 3) + 1;
465  if (filter_quant < 3)
466  return AVERROR_INVALIDDATA;
467  }
468 
469  decode_filter_coeffs(s, filter_order, size, filter_quant, filter);
470 
471  if ((ret = decode_residues(s, &decoded[filter_order],
472  subframe_size - filter_order)) < 0)
473  return ret;
474 
476  FFALIGN(subframe_size + 16, 16) * sizeof(*s->residues));
477  if (!s->residues)
478  return AVERROR(ENOMEM);
479  memset(s->residues, 0, s->residues_buf_size);
480 
481  for (i = 0; i < filter_order; i++)
482  s->residues[i] = *decoded++ >> dshift;
483 
484  for (i = 0; i < subframe_size - filter_order; i++) {
485  int v = 1 << (filter_quant - 1);
486 
487  v += s->adsp.scalarproduct_int16(&s->residues[i], filter,
488  FFALIGN(filter_order, 16));
489 
490  v = (av_clip(v >> filter_quant, -8192, 8191) << dshift) - *decoded;
491  *decoded++ = v;
492  s->residues[filter_order + i] = v >> dshift;
493  }
494 
495  emms_c();
496 
497  return 0;
498 }
499 
500 static int decode_channel(TAKDecContext *s, int chan)
501 {
502  AVCodecContext *avctx = s->avctx;
503  GetBitContext *gb = &s->gb;
504  int32_t *decoded = s->decoded[chan];
505  int left = s->nb_samples - 1;
506  int i, prev, ret, nb_subframes;
507  int subframe_len[MAX_SUBFRAMES];
508 
509  s->sample_shift[chan] = get_bits_esc4(gb);
510  if (s->sample_shift[chan] >= avctx->bits_per_coded_sample)
511  return AVERROR_INVALIDDATA;
512 
513  /* NOTE: TAK 2.2.0 appears to set the sample value to 0 if
514  * bits_per_coded_sample - sample_shift is 1, but this produces
515  * non-bit-exact output. Reading the 1 bit using get_sbits() instead
516  * of skipping it produces bit-exact output. This has been reported
517  * to the TAK author. */
518  *decoded++ = get_sbits(gb,
519  avctx->bits_per_coded_sample -
520  s->sample_shift[chan]);
521  s->lpc_mode[chan] = get_bits(gb, 2);
522  nb_subframes = get_bits(gb, 3) + 1;
523 
524  i = 0;
525  if (nb_subframes > 1) {
526  if (get_bits_left(gb) < (nb_subframes - 1) * 6)
527  return AVERROR_INVALIDDATA;
528 
529  prev = 0;
530  for (; i < nb_subframes - 1; i++) {
531  int subframe_end = get_bits(gb, 6) * s->subframe_scale;
532  if (subframe_end <= prev)
533  return AVERROR_INVALIDDATA;
534  subframe_len[i] = subframe_end - prev;
535  left -= subframe_len[i];
536  prev = subframe_end;
537  }
538 
539  if (left <= 0)
540  return AVERROR_INVALIDDATA;
541  }
542  subframe_len[i] = left;
543 
544  prev = 0;
545  for (i = 0; i < nb_subframes; i++) {
546  if ((ret = decode_subframe(s, decoded, subframe_len[i], prev)) < 0)
547  return ret;
548  decoded += subframe_len[i];
549  prev = subframe_len[i];
550  }
551 
552  return 0;
553 }
554 
555 static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
556 {
557  GetBitContext *gb = &s->gb;
558  int32_t *p1 = s->decoded[c1] + 1;
559  int32_t *p2 = s->decoded[c2] + 1;
560  int i;
561  int dshift, dfactor;
562 
563  switch (s->dmode) {
564  case 1: /* left/side */
565  for (i = 0; i < length; i++) {
566  int32_t a = p1[i];
567  int32_t b = p2[i];
568  p2[i] = a + b;
569  }
570  break;
571  case 2: /* side/right */
572  for (i = 0; i < length; i++) {
573  int32_t a = p1[i];
574  int32_t b = p2[i];
575  p1[i] = b - a;
576  }
577  break;
578  case 3: /* side/mid */
579  for (i = 0; i < length; i++) {
580  int32_t a = p1[i];
581  int32_t b = p2[i];
582  a -= b >> 1;
583  p1[i] = a;
584  p2[i] = a + b;
585  }
586  break;
587  case 4: /* side/left with scale factor */
588  FFSWAP(int32_t*, p1, p2);
589  case 5: /* side/right with scale factor */
590  dshift = get_bits_esc4(gb);
591  dfactor = get_sbits(gb, 10);
592  for (i = 0; i < length; i++) {
593  int32_t a = p1[i];
594  int32_t b = p2[i];
595  b = dfactor * (b >> dshift) + 128 >> 8 << dshift;
596  p1[i] = b - a;
597  }
598  break;
599  case 6:
600  FFSWAP(int32_t*, p1, p2);
601  case 7: {
603  int length2, order_half, filter_order, dval1, dval2;
604  int av_uninit(code_size);
605 
606  memset(filter, 0, MAX_PREDICTORS * sizeof(*filter));
607 
608  if (length < 256)
609  return AVERROR_INVALIDDATA;
610 
611  dshift = get_bits_esc4(gb);
612  filter_order = 8 << get_bits1(gb);
613  dval1 = get_bits1(gb);
614  dval2 = get_bits1(gb);
615 
616  for (i = 0; i < filter_order; i++) {
617  if (!(i & 3))
618  code_size = 14 - get_bits(gb, 3);
619  filter[i] = get_sbits(gb, code_size);
620  }
621 
622  order_half = filter_order / 2;
623  length2 = length - (filter_order - 1);
624 
625  /* decorrelate beginning samples */
626  if (dval1) {
627  for (i = 0; i < order_half; i++) {
628  int32_t a = p1[i];
629  int32_t b = p2[i];
630  p1[i] = a + b;
631  }
632  }
633 
634  /* decorrelate ending samples */
635  if (dval2) {
636  for (i = length2 + order_half; i < length; i++) {
637  int32_t a = p1[i];
638  int32_t b = p2[i];
639  p1[i] = a + b;
640  }
641  }
642 
644  FFALIGN(length + 16, 16) * sizeof(*s->residues));
645  if (!s->residues)
646  return AVERROR(ENOMEM);
647  memset(s->residues, 0, s->residues_buf_size);
648 
649  for (i = 0; i < length; i++)
650  s->residues[i] = p2[i] >> dshift;
651 
652  p1 += order_half;
653 
654  for (i = 0; i < length2; i++) {
655  int v = 1 << 9;
656 
657  v += s->adsp.scalarproduct_int16(&s->residues[i], filter,
658  FFALIGN(filter_order, 16));
659 
660  p1[i] = (av_clip(v >> 10, -8192, 8191) << dshift) - p1[i];
661  }
662 
663  emms_c();
664  break;
665  }
666  }
667 
668  return 0;
669 }
670 
671 static int tak_decode_frame(AVCodecContext *avctx, void *data,
672  int *got_frame_ptr, AVPacket *pkt)
673 {
674  TAKDecContext *s = avctx->priv_data;
675  AVFrame *frame = data;
676  GetBitContext *gb = &s->gb;
677  int chan, i, ret, hsize;
678 
679  if (pkt->size < TAK_MIN_FRAME_HEADER_BYTES)
680  return AVERROR_INVALIDDATA;
681 
682  init_get_bits(gb, pkt->data, pkt->size * 8);
683 
684  if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
685  return ret;
686 
688  avpriv_request_sample(avctx, "Frame metadata");
689  return AVERROR_PATCHWELCOME;
690  }
691 
692  hsize = get_bits_count(gb) / 8;
693  if (avctx->err_recognition & AV_EF_CRCCHECK) {
694  if (ff_tak_check_crc(pkt->data, hsize)) {
695  av_log(avctx, AV_LOG_ERROR, "CRC error\n");
696  if (avctx->err_recognition & AV_EF_EXPLODE)
697  return AVERROR_INVALIDDATA;
698  }
699  }
700 
701  if (s->ti.codec != TAK_CODEC_MONO_STEREO &&
703  av_log(avctx, AV_LOG_ERROR, "unsupported codec: %d\n", s->ti.codec);
704  return AVERROR_PATCHWELCOME;
705  }
706  if (s->ti.data_type) {
707  av_log(avctx, AV_LOG_ERROR,
708  "unsupported data type: %d\n", s->ti.data_type);
709  return AVERROR_INVALIDDATA;
710  }
711  if (s->ti.codec == TAK_CODEC_MONO_STEREO && s->ti.channels > 2) {
712  av_log(avctx, AV_LOG_ERROR,
713  "invalid number of channels: %d\n", s->ti.channels);
714  return AVERROR_INVALIDDATA;
715  }
716  if (s->ti.channels > 6) {
717  av_log(avctx, AV_LOG_ERROR,
718  "unsupported number of channels: %d\n", s->ti.channels);
719  return AVERROR_INVALIDDATA;
720  }
721 
722  if (s->ti.frame_samples <= 0) {
723  av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n");
724  return AVERROR_INVALIDDATA;
725  }
726 
727  if (s->ti.bps != avctx->bits_per_coded_sample) {
728  avctx->bits_per_coded_sample = s->ti.bps;
729  if ((ret = set_bps_params(avctx)) < 0)
730  return ret;
731  }
732  if (s->ti.sample_rate != avctx->sample_rate) {
733  avctx->sample_rate = s->ti.sample_rate;
734  set_sample_rate_params(avctx);
735  }
736  if (s->ti.ch_layout)
737  avctx->channel_layout = s->ti.ch_layout;
738  avctx->channels = s->ti.channels;
739 
741  : s->ti.frame_samples;
742 
743  frame->nb_samples = s->nb_samples;
744  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
745  return ret;
746 
747  if (avctx->bits_per_coded_sample <= 16) {
748  int buf_size = av_samples_get_buffer_size(NULL, avctx->channels,
749  s->nb_samples,
750  AV_SAMPLE_FMT_S32P, 0);
751  av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size);
752  if (!s->decode_buffer)
753  return AVERROR(ENOMEM);
755  s->decode_buffer, avctx->channels,
757  if (ret < 0)
758  return ret;
759  } else {
760  for (chan = 0; chan < avctx->channels; chan++)
761  s->decoded[chan] = (int32_t *)frame->extended_data[chan];
762  }
763 
764  if (s->nb_samples < 16) {
765  for (chan = 0; chan < avctx->channels; chan++) {
766  int32_t *decoded = s->decoded[chan];
767  for (i = 0; i < s->nb_samples; i++)
768  decoded[i] = get_sbits(gb, avctx->bits_per_coded_sample);
769  }
770  } else {
771  if (s->ti.codec == TAK_CODEC_MONO_STEREO) {
772  for (chan = 0; chan < avctx->channels; chan++)
773  if (ret = decode_channel(s, chan))
774  return ret;
775 
776  if (avctx->channels == 2) {
777  if (get_bits1(gb)) {
778  // some kind of subframe length, but it seems to be unused
779  skip_bits(gb, 6);
780  }
781 
782  s->dmode = get_bits(gb, 3);
783  if (ret = decorrelate(s, 0, 1, s->nb_samples - 1))
784  return ret;
785  }
786  } else if (s->ti.codec == TAK_CODEC_MULTICHANNEL) {
787  if (get_bits1(gb)) {
788  int ch_mask = 0;
789 
790  chan = get_bits(gb, 4) + 1;
791  if (chan > avctx->channels)
792  return AVERROR_INVALIDDATA;
793 
794  for (i = 0; i < chan; i++) {
795  int nbit = get_bits(gb, 4);
796 
797  if (nbit >= avctx->channels)
798  return AVERROR_INVALIDDATA;
799 
800  if (ch_mask & 1 << nbit)
801  return AVERROR_INVALIDDATA;
802 
803  s->mcdparams[i].present = get_bits1(gb);
804  if (s->mcdparams[i].present) {
805  s->mcdparams[i].index = get_bits(gb, 2);
806  s->mcdparams[i].chan2 = get_bits(gb, 4);
807  if (s->mcdparams[i].index == 1) {
808  if ((nbit == s->mcdparams[i].chan2) ||
809  (ch_mask & 1 << s->mcdparams[i].chan2))
810  return AVERROR_INVALIDDATA;
811 
812  ch_mask |= 1 << s->mcdparams[i].chan2;
813  } else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) {
814  return AVERROR_INVALIDDATA;
815  }
816  }
817  s->mcdparams[i].chan1 = nbit;
818 
819  ch_mask |= 1 << nbit;
820  }
821  } else {
822  chan = avctx->channels;
823  for (i = 0; i < chan; i++) {
824  s->mcdparams[i].present = 0;
825  s->mcdparams[i].chan1 = i;
826  }
827  }
828 
829  for (i = 0; i < chan; i++) {
830  if (s->mcdparams[i].present && s->mcdparams[i].index == 1)
831  if (ret = decode_channel(s, s->mcdparams[i].chan2))
832  return ret;
833 
834  if (ret = decode_channel(s, s->mcdparams[i].chan1))
835  return ret;
836 
837  if (s->mcdparams[i].present) {
838  s->dmode = mc_dmodes[s->mcdparams[i].index];
839  if (ret = decorrelate(s,
840  s->mcdparams[i].chan2,
841  s->mcdparams[i].chan1,
842  s->nb_samples - 1))
843  return ret;
844  }
845  }
846  }
847 
848  for (chan = 0; chan < avctx->channels; chan++) {
849  int32_t *decoded = s->decoded[chan];
850 
851  if (s->lpc_mode[chan])
852  decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples);
853 
854  if (s->sample_shift[chan] > 0)
855  for (i = 0; i < s->nb_samples; i++)
856  decoded[i] <<= s->sample_shift[chan];
857  }
858  }
859 
860  align_get_bits(gb);
861  skip_bits(gb, 24);
862  if (get_bits_left(gb) < 0)
863  av_log(avctx, AV_LOG_DEBUG, "overread\n");
864  else if (get_bits_left(gb) > 0)
865  av_log(avctx, AV_LOG_DEBUG, "underread\n");
866 
867  if (avctx->err_recognition & AV_EF_CRCCHECK) {
868  if (ff_tak_check_crc(pkt->data + hsize,
869  get_bits_count(gb) / 8 - hsize)) {
870  av_log(avctx, AV_LOG_ERROR, "CRC error\n");
871  if (avctx->err_recognition & AV_EF_EXPLODE)
872  return AVERROR_INVALIDDATA;
873  }
874  }
875 
876  /* convert to output buffer */
877  switch (avctx->sample_fmt) {
878  case AV_SAMPLE_FMT_U8P:
879  for (chan = 0; chan < avctx->channels; chan++) {
880  uint8_t *samples = (uint8_t *)frame->extended_data[chan];
881  int32_t *decoded = s->decoded[chan];
882  for (i = 0; i < s->nb_samples; i++)
883  samples[i] = decoded[i] + 0x80;
884  }
885  break;
886  case AV_SAMPLE_FMT_S16P:
887  for (chan = 0; chan < avctx->channels; chan++) {
888  int16_t *samples = (int16_t *)frame->extended_data[chan];
889  int32_t *decoded = s->decoded[chan];
890  for (i = 0; i < s->nb_samples; i++)
891  samples[i] = decoded[i];
892  }
893  break;
894  case AV_SAMPLE_FMT_S32P:
895  for (chan = 0; chan < avctx->channels; chan++) {
896  int32_t *samples = (int32_t *)frame->extended_data[chan];
897  for (i = 0; i < s->nb_samples; i++)
898  samples[i] <<= 8;
899  }
900  break;
901  }
902 
903  *got_frame_ptr = 1;
904 
905  return pkt->size;
906 }
907 
909 {
910  TAKDecContext *s = avctx->priv_data;
911 
912  av_freep(&s->decode_buffer);
913  av_freep(&s->residues);
914 
915  return 0;
916 }
917 
919  .name = "tak",
920  .long_name = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"),
921  .type = AVMEDIA_TYPE_AUDIO,
922  .id = AV_CODEC_ID_TAK,
923  .priv_data_size = sizeof(TAKDecContext),
925  .init_static_data = tak_init_static_data,
928  .capabilities = CODEC_CAP_DR1,
929  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
933 };
#define TAK_MAX_CHANNELS
Definition: tak.h:65
static int set_bps_params(AVCodecContext *avctx)
Definition: takdec.c:140
static const uint16_t predictor_sizes[]
Definition: takdec.c:72
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb, TAKStreamInfo *ti, int log_level_offset)
Validate and decode a frame header.
Definition: tak.c:121
int32_t(* scalarproduct_int16)(const int16_t *v1, const int16_t *v2, int len)
Calculate scalar product of two vectors.
Definition: audiodsp.h:29
int size
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
int channels
Definition: tak.h:134
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:240
int aescape
Definition: takdec.c:80
MCDParam mcdparams[TAK_MAX_CHANNELS]
Definition: takdec.c:64
int size
Definition: avcodec.h:974
static int decode_subframe(TAKDecContext *s, int32_t *decoded, int subframe_size, int prev_subframe_size)
Definition: takdec.c:418
av_cold void ff_audiodsp_init(AudioDSPContext *c)
Definition: audiodsp.c:106
uint64_t ch_layout
Definition: tak.h:139
#define FF_ARRAY_ELEMS(a)
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2514
AVCodec.
Definition: avcodec.h:2796
static int get_sbits(GetBitContext *s, int n)
Definition: get_bits.h:226
#define FFALIGN(x, a)
Definition: common.h:62
int8_t lpc_mode[TAK_MAX_CHANNELS]
Definition: takdec.c:58
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:198
int16_t * residues
Definition: takdec.c:66
unsigned int decode_buffer_size
Definition: takdec.c:55
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
int init
Definition: takdec.c:77
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1799
uint8_t
#define av_cold
Definition: attributes.h:66
int flags
Definition: tak.h:130
static av_cold int tak_decode_close(AVCodecContext *avctx)
Definition: takdec.c:908
#define b
Definition: input.c:52
int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size)
Definition: tak.c:70
#define emms_c()
Definition: internal.h:47
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
static void decode_filter_coeffs(TAKDecContext *s, int filter_order, int size, int filter_quant, int16_t *filter)
Definition: takdec.c:371
AVCodecContext * avctx
Definition: takdec.c:47
const char data[16]
Definition: mxf.c:70
uint8_t * data
Definition: avcodec.h:973
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:194
int escape
Definition: takdec.c:78
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:2507
int data_type
Definition: tak.h:132
static int decode_channel(TAKDecContext *s, int chan)
Definition: takdec.c:500
#define MAX_SUBFRAMES
Definition: takdec.c:36
int8_t index
Definition: takdec.c:41
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:555
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
int uval
Definition: takdec.c:52
#define AVERROR(e)
Definition: error.h:43
sample_fmts
Definition: avconv_filter.c:68
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:144
av_cold void ff_tak_init_crc(void)
Definition: tak.c:62
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:169
const char * name
Name of the codec implementation.
Definition: avcodec.h:2803
int8_t present
Definition: takdec.c:40
int last_frame_samples
Definition: tak.h:138
static int decode_residues(TAKDecContext *s, int32_t *decoded, int length)
Definition: takdec.c:283
#define FFMAX(a, b)
Definition: common.h:55
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1852
int bps
Definition: tak.h:135
common internal API header
static void filter(MpegAudioContext *s, int ch, const short *samples, int incr)
Definition: mpegaudioenc.c:307
static av_cold int tak_decode_init(AVCodecContext *avctx)
Definition: takdec.c:171
int8_t chan2
Definition: takdec.c:43
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:2406
signed 32 bits, planar
Definition: samplefmt.h:71
static const struct CParam xcodes[50]
int scale
Definition: takdec.c:79
unsigned int residues_buf_size
Definition: takdec.c:67
int32_t
static int get_bits_esc4(GetBitContext *gb)
Definition: takdec.c:363
#define AV_EF_EXPLODE
Definition: avcodec.h:2417
unsigned 8 bits, planar
Definition: samplefmt.h:69
AudioDSPContext adsp
Definition: takdec.c:48
uint8_t * decode_buffer
Definition: takdec.c:54
static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
Definition: takdec.c:555
static void decode_lpc(int32_t *coeffs, int mode, int length)
Definition: takdec.c:184
#define AVERROR_PATCHWELCOME
Not yet implemented in Libav, patches welcome.
Definition: error.h:57
AVCodec ff_tak_decoder
Definition: takdec.c:918
NULL
Definition: eval.c:55
Definition: takdec.c:76
#define TAK_FRAME_FLAG_HAS_METADATA
Definition: tak.h:63
Libavcodec external API header.
AVSampleFormat
Audio Sample Formats.
Definition: samplefmt.h:61
#define TAK_MIN_FRAME_HEADER_BYTES
Definition: tak.h:98
AV_SAMPLE_FMT_NONE
Definition: avconv_filter.c:68
int sample_rate
samples per second
Definition: avcodec.h:1791
main external API structure.
Definition: avcodec.h:1050
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:612
enum TAKCodecType codec
Definition: tak.h:131
int32_t * decoded[TAK_MAX_CHANNELS]
Definition: takdec.c:56
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:271
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:263
int frame_samples
Definition: tak.h:137
int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)
Get the required buffer size for the given audio parameters.
Definition: samplefmt.c:108
TAK (Tom's lossless Audio Kompressor) decoder/demuxer common functions.
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:375
GetBitContext gb
Definition: takdec.c:50
int8_t dmode
Definition: takdec.c:62
#define AV_EF_CRCCHECK
Verify checksums embedded in the bitstream (could be of either encoded or decoded data...
Definition: avcodec.h:2414
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
Definition: get_bits.h:304
int sample_rate
Definition: tak.h:133
int bias
Definition: takdec.c:81
int nb_samples
Definition: takdec.c:53
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: mem.c:388
TAKStreamInfo ti
Definition: takdec.c:49
common internal api header.
int8_t chan1
Definition: takdec.c:42
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:33
static int decode_segment(GetBitContext *gb, int mode, int32_t *decoded, int len)
Definition: takdec.c:239
static const int8_t mc_dmodes[]
Definition: takdec.c:70
int subframe_scale
Definition: takdec.c:60
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1092
int av_samples_fill_arrays(uint8_t **audio_data, int *linesize, const uint8_t *buf, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align)
Fill channel data pointers and linesize for samples with sample format sample_fmt.
Definition: samplefmt.c:140
static int tak_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *pkt)
Definition: takdec.c:671
int len
int channels
number of audio channels
Definition: avcodec.h:1792
static const uint8_t * align_get_bits(GetBitContext *s)
Definition: get_bits.h:416
#define MAX_PREDICTORS
Definition: takdec.c:37
#define av_uninit(x)
Definition: attributes.h:109
#define LOCAL_ALIGNED_16(t, v,...)
Definition: internal.h:114
static void set_sample_rate_params(AVCodecContext *avctx)
Definition: takdec.c:162
int8_t sample_shift[TAK_MAX_CHANNELS]
Definition: takdec.c:59
signed 16 bits, planar
Definition: samplefmt.h:70
#define FFSWAP(type, a, b)
Definition: common.h:60
static av_cold void tak_init_static_data(AVCodec *codec)
Definition: takdec.c:135
uint8_t ** extended_data
pointers to the data planes/channels.
Definition: frame.h:169
This structure stores compressed data.
Definition: avcodec.h:950
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:179
for(j=16;j >0;--j)