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takdec.c
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1 /*
2  * TAK decoder
3  * Copyright (c) 2012 Paul B Mahol
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * TAK (Tom's lossless Audio Kompressor) decoder
25  * @author Paul B Mahol
26  */
27 
28 #include "libavutil/internal.h"
29 #include "libavutil/samplefmt.h"
30 #include "tak.h"
31 #include "audiodsp.h"
32 #include "thread.h"
33 #include "avcodec.h"
34 #include "internal.h"
35 #include "unary.h"
36 
37 #define MAX_SUBFRAMES 8 ///< max number of subframes per channel
38 #define MAX_PREDICTORS 256
39 
40 typedef struct MCDParam {
41  int8_t present; ///< decorrelation parameter availability for this channel
42  int8_t index; ///< index into array of decorrelation types
43  int8_t chan1;
44  int8_t chan2;
45 } MCDParam;
46 
47 typedef struct TAKDecContext {
48  AVCodecContext *avctx; ///< parent AVCodecContext
51  GetBitContext gb; ///< bitstream reader initialized to start at the current frame
52 
53  int uval;
54  int nb_samples; ///< number of samples in the current frame
56  unsigned int decode_buffer_size;
57  int32_t *decoded[TAK_MAX_CHANNELS]; ///< decoded samples for each channel
58 
60  int8_t sample_shift[TAK_MAX_CHANNELS]; ///< shift applied to every sample in the channel
62  int nb_subframes; ///< number of subframes in the current frame
63  int16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples
65 
66  int8_t dmode; ///< channel decorrelation type in the current frame
67 
68  MCDParam mcdparams[TAK_MAX_CHANNELS]; ///< multichannel decorrelation parameters
69 
70  int8_t coding_mode[128];
72  DECLARE_ALIGNED(16, int16_t, residues)[544];
74 
75 static const int8_t mc_dmodes[] = { 1, 3, 4, 6, };
76 
77 static const uint16_t predictor_sizes[] = {
78  4, 8, 12, 16, 24, 32, 48, 64, 80, 96, 128, 160, 192, 224, 256, 0,
79 };
80 
81 static const struct CParam {
82  int init;
83  int escape;
84  int scale;
85  int aescape;
86  int bias;
87 } xcodes[50] = {
88  { 0x01, 0x0000001, 0x0000001, 0x0000003, 0x0000008 },
89  { 0x02, 0x0000003, 0x0000001, 0x0000007, 0x0000006 },
90  { 0x03, 0x0000005, 0x0000002, 0x000000E, 0x000000D },
91  { 0x03, 0x0000003, 0x0000003, 0x000000D, 0x0000018 },
92  { 0x04, 0x000000B, 0x0000004, 0x000001C, 0x0000019 },
93  { 0x04, 0x0000006, 0x0000006, 0x000001A, 0x0000030 },
94  { 0x05, 0x0000016, 0x0000008, 0x0000038, 0x0000032 },
95  { 0x05, 0x000000C, 0x000000C, 0x0000034, 0x0000060 },
96  { 0x06, 0x000002C, 0x0000010, 0x0000070, 0x0000064 },
97  { 0x06, 0x0000018, 0x0000018, 0x0000068, 0x00000C0 },
98  { 0x07, 0x0000058, 0x0000020, 0x00000E0, 0x00000C8 },
99  { 0x07, 0x0000030, 0x0000030, 0x00000D0, 0x0000180 },
100  { 0x08, 0x00000B0, 0x0000040, 0x00001C0, 0x0000190 },
101  { 0x08, 0x0000060, 0x0000060, 0x00001A0, 0x0000300 },
102  { 0x09, 0x0000160, 0x0000080, 0x0000380, 0x0000320 },
103  { 0x09, 0x00000C0, 0x00000C0, 0x0000340, 0x0000600 },
104  { 0x0A, 0x00002C0, 0x0000100, 0x0000700, 0x0000640 },
105  { 0x0A, 0x0000180, 0x0000180, 0x0000680, 0x0000C00 },
106  { 0x0B, 0x0000580, 0x0000200, 0x0000E00, 0x0000C80 },
107  { 0x0B, 0x0000300, 0x0000300, 0x0000D00, 0x0001800 },
108  { 0x0C, 0x0000B00, 0x0000400, 0x0001C00, 0x0001900 },
109  { 0x0C, 0x0000600, 0x0000600, 0x0001A00, 0x0003000 },
110  { 0x0D, 0x0001600, 0x0000800, 0x0003800, 0x0003200 },
111  { 0x0D, 0x0000C00, 0x0000C00, 0x0003400, 0x0006000 },
112  { 0x0E, 0x0002C00, 0x0001000, 0x0007000, 0x0006400 },
113  { 0x0E, 0x0001800, 0x0001800, 0x0006800, 0x000C000 },
114  { 0x0F, 0x0005800, 0x0002000, 0x000E000, 0x000C800 },
115  { 0x0F, 0x0003000, 0x0003000, 0x000D000, 0x0018000 },
116  { 0x10, 0x000B000, 0x0004000, 0x001C000, 0x0019000 },
117  { 0x10, 0x0006000, 0x0006000, 0x001A000, 0x0030000 },
118  { 0x11, 0x0016000, 0x0008000, 0x0038000, 0x0032000 },
119  { 0x11, 0x000C000, 0x000C000, 0x0034000, 0x0060000 },
120  { 0x12, 0x002C000, 0x0010000, 0x0070000, 0x0064000 },
121  { 0x12, 0x0018000, 0x0018000, 0x0068000, 0x00C0000 },
122  { 0x13, 0x0058000, 0x0020000, 0x00E0000, 0x00C8000 },
123  { 0x13, 0x0030000, 0x0030000, 0x00D0000, 0x0180000 },
124  { 0x14, 0x00B0000, 0x0040000, 0x01C0000, 0x0190000 },
125  { 0x14, 0x0060000, 0x0060000, 0x01A0000, 0x0300000 },
126  { 0x15, 0x0160000, 0x0080000, 0x0380000, 0x0320000 },
127  { 0x15, 0x00C0000, 0x00C0000, 0x0340000, 0x0600000 },
128  { 0x16, 0x02C0000, 0x0100000, 0x0700000, 0x0640000 },
129  { 0x16, 0x0180000, 0x0180000, 0x0680000, 0x0C00000 },
130  { 0x17, 0x0580000, 0x0200000, 0x0E00000, 0x0C80000 },
131  { 0x17, 0x0300000, 0x0300000, 0x0D00000, 0x1800000 },
132  { 0x18, 0x0B00000, 0x0400000, 0x1C00000, 0x1900000 },
133  { 0x18, 0x0600000, 0x0600000, 0x1A00000, 0x3000000 },
134  { 0x19, 0x1600000, 0x0800000, 0x3800000, 0x3200000 },
135  { 0x19, 0x0C00000, 0x0C00000, 0x3400000, 0x6000000 },
136  { 0x1A, 0x2C00000, 0x1000000, 0x7000000, 0x6400000 },
137  { 0x1A, 0x1800000, 0x1800000, 0x6800000, 0xC000000 },
138 };
139 
140 static int set_bps_params(AVCodecContext *avctx)
141 {
142  switch (avctx->bits_per_raw_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, "invalid/unsupported bits per sample: %d\n",
154  avctx->bits_per_raw_sample);
155  return AVERROR_INVALIDDATA;
156  }
157 
158  return 0;
159 }
160 
162 {
163  TAKDecContext *s = avctx->priv_data;
164  int shift = 3 - (avctx->sample_rate / 11025);
165  shift = FFMAX(0, shift);
166  s->uval = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << shift;
167  s->subframe_scale = FFALIGN(avctx->sample_rate + 511 >> 9, 4) << 1;
168 }
169 
171 {
172  TAKDecContext *s = avctx->priv_data;
173 
174  ff_audiodsp_init(&s->adsp);
175 
176  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(TAKDecContext *s, int8_t mode, int32_t *decoded, int len)
240 {
241  struct CParam code;
242  GetBitContext *gb = &s->gb;
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 
294  wlength = length / s->uval;
295 
296  rval = length - (wlength * s->uval);
297 
298  if (rval < s->uval / 2)
299  rval += s->uval;
300  else
301  wlength++;
302 
303  if (wlength <= 1 || wlength > 128)
304  return AVERROR_INVALIDDATA;
305 
306  s->coding_mode[0] = mode = get_bits(gb, 6);
307 
308  for (i = 1; i < wlength; i++) {
309  int c = get_unary(gb, 1, 6);
310 
311  switch (c) {
312  case 6:
313  mode = get_bits(gb, 6);
314  break;
315  case 5:
316  case 4:
317  case 3: {
318  /* mode += sign ? (1 - c) : (c - 1) */
319  int sign = get_bits1(gb);
320  mode += (-sign ^ (c - 1)) + sign;
321  break;
322  }
323  case 2:
324  mode++;
325  break;
326  case 1:
327  mode--;
328  break;
329  }
330  s->coding_mode[i] = mode;
331  }
332 
333  i = 0;
334  while (i < wlength) {
335  int len = 0;
336 
337  mode = s->coding_mode[i];
338  do {
339  if (i >= wlength - 1)
340  len += rval;
341  else
342  len += s->uval;
343  i++;
344 
345  if (i == wlength)
346  break;
347  } while (s->coding_mode[i] == mode);
348 
349  if ((ret = decode_segment(s, mode, decoded, len)) < 0)
350  return ret;
351  decoded += len;
352  }
353  } else {
354  mode = get_bits(gb, 6);
355  if ((ret = decode_segment(s, mode, decoded, length)) < 0)
356  return ret;
357  }
358 
359  return 0;
360 }
361 
363 {
364  if (get_bits1(gb))
365  return get_bits(gb, 4) + 1;
366  else
367  return 0;
368 }
369 
370 static int decode_subframe(TAKDecContext *s, int32_t *decoded,
371  int subframe_size, int prev_subframe_size)
372 {
373  GetBitContext *gb = &s->gb;
374  int x, y, i, j, ret = 0;
375  int dshift, size, filter_quant, filter_order;
376  int tfilter[MAX_PREDICTORS];
377 
378  if (!get_bits1(gb))
379  return decode_residues(s, decoded, subframe_size);
380 
381  filter_order = predictor_sizes[get_bits(gb, 4)];
382 
383  if (prev_subframe_size > 0 && get_bits1(gb)) {
384  if (filter_order > prev_subframe_size)
385  return AVERROR_INVALIDDATA;
386 
387  decoded -= filter_order;
388  subframe_size += filter_order;
389 
390  if (filter_order > subframe_size)
391  return AVERROR_INVALIDDATA;
392  } else {
393  int lpc_mode;
394 
395  if (filter_order > subframe_size)
396  return AVERROR_INVALIDDATA;
397 
398  lpc_mode = get_bits(gb, 2);
399  if (lpc_mode > 2)
400  return AVERROR_INVALIDDATA;
401 
402  if ((ret = decode_residues(s, decoded, filter_order)) < 0)
403  return ret;
404 
405  if (lpc_mode)
406  decode_lpc(decoded, lpc_mode, filter_order);
407  }
408 
409  dshift = get_bits_esc4(gb);
410  size = get_bits1(gb) + 6;
411 
412  filter_quant = 10;
413  if (get_bits1(gb)) {
414  filter_quant -= get_bits(gb, 3) + 1;
415  if (filter_quant < 3)
416  return AVERROR_INVALIDDATA;
417  }
418 
419  s->predictors[0] = get_sbits(gb, 10);
420  s->predictors[1] = get_sbits(gb, 10);
421  s->predictors[2] = get_sbits(gb, size) << (10 - size);
422  s->predictors[3] = get_sbits(gb, size) << (10 - size);
423  if (filter_order > 4) {
424  int tmp = size - get_bits1(gb);
425 
426  for (i = 4; i < filter_order; i++) {
427  if (!(i & 3))
428  x = tmp - get_bits(gb, 2);
429  s->predictors[i] = get_sbits(gb, x) << (10 - size);
430  }
431  }
432 
433  tfilter[0] = s->predictors[0] << 6;
434  for (i = 1; i < filter_order; i++) {
435  int32_t *p1 = &tfilter[0];
436  int32_t *p2 = &tfilter[i - 1];
437 
438  for (j = 0; j < (i + 1) / 2; j++) {
439  x = *p1 + (s->predictors[i] * *p2 + 256 >> 9);
440  *p2 += s->predictors[i] * *p1 + 256 >> 9;
441  *p1++ = x;
442  p2--;
443  }
444 
445  tfilter[i] = s->predictors[i] << 6;
446  }
447 
448  x = 1 << (32 - (15 - filter_quant));
449  y = 1 << ((15 - filter_quant) - 1);
450  for (i = 0, j = filter_order - 1; i < filter_order / 2; i++, j--) {
451  s->filter[j] = x - ((tfilter[i] + y) >> (15 - filter_quant));
452  s->filter[i] = x - ((tfilter[j] + y) >> (15 - filter_quant));
453  }
454 
455  if ((ret = decode_residues(s, &decoded[filter_order],
456  subframe_size - filter_order)) < 0)
457  return ret;
458 
459  for (i = 0; i < filter_order; i++)
460  s->residues[i] = *decoded++ >> dshift;
461 
462  y = FF_ARRAY_ELEMS(s->residues) - filter_order;
463  x = subframe_size - filter_order;
464  while (x > 0) {
465  int tmp = FFMIN(y, x);
466 
467  for (i = 0; i < tmp; i++) {
468  int v = 1 << (filter_quant - 1);
469 
470  if (filter_order & -16)
471  v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
472  filter_order & -16);
473  for (j = filter_order & -16; j < filter_order; j += 4) {
474  v += s->residues[i + j + 3] * s->filter[j + 3] +
475  s->residues[i + j + 2] * s->filter[j + 2] +
476  s->residues[i + j + 1] * s->filter[j + 1] +
477  s->residues[i + j ] * s->filter[j ];
478  }
479  v = (av_clip(v >> filter_quant, -8192, 8191) << dshift) - *decoded;
480  *decoded++ = v;
481  s->residues[filter_order + i] = v >> dshift;
482  }
483 
484  x -= tmp;
485  if (x > 0)
486  memcpy(s->residues, &s->residues[y], 2 * filter_order);
487  }
488 
489  emms_c();
490 
491  return 0;
492 }
493 
494 static int decode_channel(TAKDecContext *s, int chan)
495 {
496  AVCodecContext *avctx = s->avctx;
497  GetBitContext *gb = &s->gb;
498  int32_t *decoded = s->decoded[chan];
499  int left = s->nb_samples - 1;
500  int i = 0, ret, prev = 0;
501 
502  s->sample_shift[chan] = get_bits_esc4(gb);
503  if (s->sample_shift[chan] >= avctx->bits_per_raw_sample)
504  return AVERROR_INVALIDDATA;
505 
506  *decoded++ = get_sbits(gb, avctx->bits_per_raw_sample - s->sample_shift[chan]);
507  s->lpc_mode[chan] = get_bits(gb, 2);
508  s->nb_subframes = get_bits(gb, 3) + 1;
509 
510  if (s->nb_subframes > 1) {
511  if (get_bits_left(gb) < (s->nb_subframes - 1) * 6)
512  return AVERROR_INVALIDDATA;
513 
514  for (; i < s->nb_subframes - 1; i++) {
515  int v = get_bits(gb, 6);
516 
517  s->subframe_len[i] = (v - prev) * s->subframe_scale;
518  if (s->subframe_len[i] <= 0)
519  return AVERROR_INVALIDDATA;
520 
521  left -= s->subframe_len[i];
522  prev = v;
523  }
524 
525  if (left <= 0)
526  return AVERROR_INVALIDDATA;
527  }
528  s->subframe_len[i] = left;
529 
530  prev = 0;
531  for (i = 0; i < s->nb_subframes; i++) {
532  if ((ret = decode_subframe(s, decoded, s->subframe_len[i], prev)) < 0)
533  return ret;
534  decoded += s->subframe_len[i];
535  prev = s->subframe_len[i];
536  }
537 
538  return 0;
539 }
540 
541 static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
542 {
543  GetBitContext *gb = &s->gb;
544  int32_t *p1 = s->decoded[c1] + 1;
545  int32_t *p2 = s->decoded[c2] + 1;
546  int i;
547  int dshift, dfactor;
548 
549  switch (s->dmode) {
550  case 1: /* left/side */
551  for (i = 0; i < length; i++) {
552  int32_t a = p1[i];
553  int32_t b = p2[i];
554  p2[i] = a + b;
555  }
556  break;
557  case 2: /* side/right */
558  for (i = 0; i < length; i++) {
559  int32_t a = p1[i];
560  int32_t b = p2[i];
561  p1[i] = b - a;
562  }
563  break;
564  case 3: /* side/mid */
565  for (i = 0; i < length; i++) {
566  int32_t a = p1[i];
567  int32_t b = p2[i];
568  a -= b >> 1;
569  p1[i] = a;
570  p2[i] = a + b;
571  }
572  break;
573  case 4: /* side/left with scale factor */
574  FFSWAP(int32_t*, p1, p2);
575  case 5: /* side/right with scale factor */
576  dshift = get_bits_esc4(gb);
577  dfactor = get_sbits(gb, 10);
578  for (i = 0; i < length; i++) {
579  int32_t a = p1[i];
580  int32_t b = p2[i];
581  b = dfactor * (b >> dshift) + 128 >> 8 << dshift;
582  p1[i] = b - a;
583  }
584  break;
585  case 6:
586  FFSWAP(int32_t*, p1, p2);
587  case 7: {
588  int length2, order_half, filter_order, dval1, dval2;
589  int tmp, x, code_size;
590 
591  if (length < 256)
592  return AVERROR_INVALIDDATA;
593 
594  dshift = get_bits_esc4(gb);
595  filter_order = 8 << get_bits1(gb);
596  dval1 = get_bits1(gb);
597  dval2 = get_bits1(gb);
598 
599  for (i = 0; i < filter_order; i++) {
600  if (!(i & 3))
601  code_size = 14 - get_bits(gb, 3);
602  s->filter[i] = get_sbits(gb, code_size);
603  }
604 
605  order_half = filter_order / 2;
606  length2 = length - (filter_order - 1);
607 
608  /* decorrelate beginning samples */
609  if (dval1) {
610  for (i = 0; i < order_half; i++) {
611  int32_t a = p1[i];
612  int32_t b = p2[i];
613  p1[i] = a + b;
614  }
615  }
616 
617  /* decorrelate ending samples */
618  if (dval2) {
619  for (i = length2 + order_half; i < length; i++) {
620  int32_t a = p1[i];
621  int32_t b = p2[i];
622  p1[i] = a + b;
623  }
624  }
625 
626 
627  for (i = 0; i < filter_order; i++)
628  s->residues[i] = *p2++ >> dshift;
629 
630  p1 += order_half;
631  x = FF_ARRAY_ELEMS(s->residues) - filter_order;
632  for (; length2 > 0; length2 -= tmp) {
633  tmp = FFMIN(length2, x);
634 
635  for (i = 0; i < tmp; i++)
636  s->residues[filter_order + i] = *p2++ >> dshift;
637 
638  for (i = 0; i < tmp; i++) {
639  int v = 1 << 9;
640 
641  if (filter_order == 16) {
642  v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
643  filter_order);
644  } else {
645  v += s->residues[i + 7] * s->filter[7] +
646  s->residues[i + 6] * s->filter[6] +
647  s->residues[i + 5] * s->filter[5] +
648  s->residues[i + 4] * s->filter[4] +
649  s->residues[i + 3] * s->filter[3] +
650  s->residues[i + 2] * s->filter[2] +
651  s->residues[i + 1] * s->filter[1] +
652  s->residues[i ] * s->filter[0];
653  }
654 
655  v = (av_clip(v >> 10, -8192, 8191) << dshift) - *p1;
656  *p1++ = v;
657  }
658 
659  memcpy(s->residues, &s->residues[tmp], 2 * filter_order);
660  }
661 
662  emms_c();
663  break;
664  }
665  }
666 
667  return 0;
668 }
669 
670 static int tak_decode_frame(AVCodecContext *avctx, void *data,
671  int *got_frame_ptr, AVPacket *pkt)
672 {
673  TAKDecContext *s = avctx->priv_data;
674  AVFrame *frame = data;
675  ThreadFrame tframe = { .f = 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  if ((ret = init_get_bits8(gb, pkt->data, pkt->size)) < 0)
683  return ret;
684 
685  if ((ret = ff_tak_decode_frame_header(avctx, gb, &s->ti, 0)) < 0)
686  return ret;
687 
688  hsize = get_bits_count(gb) / 8;
690  if (ff_tak_check_crc(pkt->data, hsize)) {
691  av_log(avctx, AV_LOG_ERROR, "CRC error\n");
692  if (avctx->err_recognition & AV_EF_EXPLODE)
693  return AVERROR_INVALIDDATA;
694  }
695  }
696 
697  if (s->ti.codec != TAK_CODEC_MONO_STEREO &&
699  av_log(avctx, AV_LOG_ERROR, "unsupported codec: %d\n", s->ti.codec);
700  return AVERROR_PATCHWELCOME;
701  }
702  if (s->ti.data_type) {
703  av_log(avctx, AV_LOG_ERROR,
704  "unsupported data type: %d\n", s->ti.data_type);
705  return AVERROR_INVALIDDATA;
706  }
707  if (s->ti.codec == TAK_CODEC_MONO_STEREO && s->ti.channels > 2) {
708  av_log(avctx, AV_LOG_ERROR,
709  "invalid number of channels: %d\n", s->ti.channels);
710  return AVERROR_INVALIDDATA;
711  }
712  if (s->ti.channels > 6) {
713  av_log(avctx, AV_LOG_ERROR,
714  "unsupported number of channels: %d\n", s->ti.channels);
715  return AVERROR_INVALIDDATA;
716  }
717 
718  if (s->ti.frame_samples <= 0) {
719  av_log(avctx, AV_LOG_ERROR, "unsupported/invalid number of samples\n");
720  return AVERROR_INVALIDDATA;
721  }
722 
723  avctx->bits_per_raw_sample = s->ti.bps;
724  if ((ret = set_bps_params(avctx)) < 0)
725  return ret;
726  if (s->ti.sample_rate != avctx->sample_rate) {
727  avctx->sample_rate = s->ti.sample_rate;
728  set_sample_rate_params(avctx);
729  }
730  if (s->ti.ch_layout)
731  avctx->channel_layout = s->ti.ch_layout;
732  avctx->channels = s->ti.channels;
733 
735  : s->ti.frame_samples;
736 
737  frame->nb_samples = s->nb_samples;
738  if ((ret = ff_thread_get_buffer(avctx, &tframe, 0)) < 0)
739  return ret;
740  ff_thread_finish_setup(avctx);
741 
742  if (avctx->bits_per_raw_sample <= 16) {
743  int buf_size = av_samples_get_buffer_size(NULL, avctx->channels,
744  s->nb_samples,
745  AV_SAMPLE_FMT_S32P, 0);
746  if (buf_size < 0)
747  return buf_size;
748  av_fast_malloc(&s->decode_buffer, &s->decode_buffer_size, buf_size);
749  if (!s->decode_buffer)
750  return AVERROR(ENOMEM);
751  ret = av_samples_fill_arrays((uint8_t **)s->decoded, NULL,
752  s->decode_buffer, avctx->channels,
754  if (ret < 0)
755  return ret;
756  } else {
757  for (chan = 0; chan < avctx->channels; chan++)
758  s->decoded[chan] = (int32_t *)frame->extended_data[chan];
759  }
760 
761  if (s->nb_samples < 16) {
762  for (chan = 0; chan < avctx->channels; chan++) {
763  int32_t *decoded = s->decoded[chan];
764  for (i = 0; i < s->nb_samples; i++)
765  decoded[i] = get_sbits(gb, avctx->bits_per_raw_sample);
766  }
767  } else {
768  if (s->ti.codec == TAK_CODEC_MONO_STEREO) {
769  for (chan = 0; chan < avctx->channels; chan++)
770  if (ret = decode_channel(s, chan))
771  return ret;
772 
773  if (avctx->channels == 2) {
774  s->nb_subframes = get_bits(gb, 1) + 1;
775  if (s->nb_subframes > 1) {
776  s->subframe_len[1] = get_bits(gb, 6);
777  }
778 
779  s->dmode = get_bits(gb, 3);
780  if (ret = decorrelate(s, 0, 1, s->nb_samples - 1))
781  return ret;
782  }
783  } else if (s->ti.codec == TAK_CODEC_MULTICHANNEL) {
784  if (get_bits1(gb)) {
785  int ch_mask = 0;
786 
787  chan = get_bits(gb, 4) + 1;
788  if (chan > avctx->channels)
789  return AVERROR_INVALIDDATA;
790 
791  for (i = 0; i < chan; i++) {
792  int nbit = get_bits(gb, 4);
793 
794  if (nbit >= avctx->channels)
795  return AVERROR_INVALIDDATA;
796 
797  if (ch_mask & 1 << nbit)
798  return AVERROR_INVALIDDATA;
799 
800  s->mcdparams[i].present = get_bits1(gb);
801  if (s->mcdparams[i].present) {
802  s->mcdparams[i].index = get_bits(gb, 2);
803  s->mcdparams[i].chan2 = get_bits(gb, 4);
804  if (s->mcdparams[i].index == 1) {
805  if ((nbit == s->mcdparams[i].chan2) ||
806  (ch_mask & 1 << s->mcdparams[i].chan2))
807  return AVERROR_INVALIDDATA;
808 
809  ch_mask |= 1 << s->mcdparams[i].chan2;
810  } else if (!(ch_mask & 1 << s->mcdparams[i].chan2)) {
811  return AVERROR_INVALIDDATA;
812  }
813  }
814  s->mcdparams[i].chan1 = nbit;
815 
816  ch_mask |= 1 << nbit;
817  }
818  } else {
819  chan = avctx->channels;
820  for (i = 0; i < chan; i++) {
821  s->mcdparams[i].present = 0;
822  s->mcdparams[i].chan1 = i;
823  }
824  }
825 
826  for (i = 0; i < chan; i++) {
827  if (s->mcdparams[i].present && s->mcdparams[i].index == 1)
828  if (ret = decode_channel(s, s->mcdparams[i].chan2))
829  return ret;
830 
831  if (ret = decode_channel(s, s->mcdparams[i].chan1))
832  return ret;
833 
834  if (s->mcdparams[i].present) {
835  s->dmode = mc_dmodes[s->mcdparams[i].index];
836  if (ret = decorrelate(s,
837  s->mcdparams[i].chan2,
838  s->mcdparams[i].chan1,
839  s->nb_samples - 1))
840  return ret;
841  }
842  }
843  }
844 
845  for (chan = 0; chan < avctx->channels; chan++) {
846  int32_t *decoded = s->decoded[chan];
847 
848  if (s->lpc_mode[chan])
849  decode_lpc(decoded, s->lpc_mode[chan], s->nb_samples);
850 
851  if (s->sample_shift[chan] > 0)
852  for (i = 0; i < s->nb_samples; i++)
853  decoded[i] <<= s->sample_shift[chan];
854  }
855  }
856 
857  align_get_bits(gb);
858  skip_bits(gb, 24);
859  if (get_bits_left(gb) < 0)
860  av_log(avctx, AV_LOG_DEBUG, "overread\n");
861  else if (get_bits_left(gb) > 0)
862  av_log(avctx, AV_LOG_DEBUG, "underread\n");
863 
865  if (ff_tak_check_crc(pkt->data + hsize,
866  get_bits_count(gb) / 8 - hsize)) {
867  av_log(avctx, AV_LOG_ERROR, "CRC error\n");
868  if (avctx->err_recognition & AV_EF_EXPLODE)
869  return AVERROR_INVALIDDATA;
870  }
871  }
872 
873  /* convert to output buffer */
874  switch (avctx->sample_fmt) {
875  case AV_SAMPLE_FMT_U8P:
876  for (chan = 0; chan < avctx->channels; chan++) {
877  uint8_t *samples = (uint8_t *)frame->extended_data[chan];
878  int32_t *decoded = s->decoded[chan];
879  for (i = 0; i < s->nb_samples; i++)
880  samples[i] = decoded[i] + 0x80;
881  }
882  break;
883  case AV_SAMPLE_FMT_S16P:
884  for (chan = 0; chan < avctx->channels; chan++) {
885  int16_t *samples = (int16_t *)frame->extended_data[chan];
886  int32_t *decoded = s->decoded[chan];
887  for (i = 0; i < s->nb_samples; i++)
888  samples[i] = decoded[i];
889  }
890  break;
891  case AV_SAMPLE_FMT_S32P:
892  for (chan = 0; chan < avctx->channels; chan++) {
893  int32_t *samples = (int32_t *)frame->extended_data[chan];
894  for (i = 0; i < s->nb_samples; i++)
895  samples[i] <<= 8;
896  }
897  break;
898  }
899 
900  *got_frame_ptr = 1;
901 
902  return pkt->size;
903 }
904 
906 {
907  TAKDecContext *s = avctx->priv_data;
908  s->avctx = avctx;
909  return 0;
910 }
911 
913  const AVCodecContext *src)
914 {
915  TAKDecContext *tsrc = src->priv_data;
916  TAKDecContext *tdst = dst->priv_data;
917 
918  if (dst == src)
919  return 0;
920  memcpy(&tdst->ti, &tsrc->ti, sizeof(TAKStreamInfo));
921  return 0;
922 }
923 
925 {
926  TAKDecContext *s = avctx->priv_data;
927 
928  av_freep(&s->decode_buffer);
929 
930  return 0;
931 }
932 
934  .name = "tak",
935  .long_name = NULL_IF_CONFIG_SMALL("TAK (Tom's lossless Audio Kompressor)"),
936  .type = AVMEDIA_TYPE_AUDIO,
937  .id = AV_CODEC_ID_TAK,
938  .priv_data_size = sizeof(TAKDecContext),
943  .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
944  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
945  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P,
949 };