FFmpeg
cook.c
Go to the documentation of this file.
1 /*
2  * COOK compatible decoder
3  * Copyright (c) 2003 Sascha Sommer
4  * Copyright (c) 2005 Benjamin Larsson
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * Cook compatible decoder. Bastardization of the G.722.1 standard.
26  * This decoder handles RealNetworks, RealAudio G2 data.
27  * Cook is identified by the codec name cook in RM files.
28  *
29  * To use this decoder, a calling application must supply the extradata
30  * bytes provided from the RM container; 8+ bytes for mono streams and
31  * 16+ for stereo streams (maybe more).
32  *
33  * Codec technicalities (all this assume a buffer length of 1024):
34  * Cook works with several different techniques to achieve its compression.
35  * In the timedomain the buffer is divided into 8 pieces and quantized. If
36  * two neighboring pieces have different quantization index a smooth
37  * quantization curve is used to get a smooth overlap between the different
38  * pieces.
39  * To get to the transformdomain Cook uses a modulated lapped transform.
40  * The transform domain has 50 subbands with 20 elements each. This
41  * means only a maximum of 50*20=1000 coefficients are used out of the 1024
42  * available.
43  */
44 
46 #include "libavutil/lfg.h"
47 #include "libavutil/mem.h"
48 #include "libavutil/mem_internal.h"
49 #include "libavutil/thread.h"
50 #include "libavutil/tx.h"
51 
52 #include "audiodsp.h"
53 #include "avcodec.h"
54 #include "get_bits.h"
55 #include "bytestream.h"
56 #include "codec_internal.h"
57 #include "decode.h"
58 #include "sinewin.h"
59 #include "unary.h"
60 
61 #include "cookdata.h"
62 
63 /* the different Cook versions */
64 #define MONO 0x1000001
65 #define STEREO 0x1000002
66 #define JOINT_STEREO 0x1000003
67 #define MC_COOK 0x2000000
68 
69 #define SUBBAND_SIZE 20
70 #define MAX_SUBPACKETS 5
71 
72 #define QUANT_VLC_BITS 9
73 #define COUPLING_VLC_BITS 6
74 
75 typedef struct cook_gains {
76  int *now;
77  int *previous;
78 } cook_gains;
79 
80 typedef struct COOKSubpacket {
81  int ch_idx;
82  int size;
85  int subbands;
90  unsigned int channel_mask;
96  int numvector_size; // 1 << log2_numvector_size;
97 
98  float mono_previous_buffer1[1024];
99  float mono_previous_buffer2[1024];
100 
103  int gain_1[9];
104  int gain_2[9];
105  int gain_3[9];
106  int gain_4[9];
107 } COOKSubpacket;
108 
109 typedef struct cook {
110  /*
111  * The following 5 functions provide the lowlevel arithmetic on
112  * the internal audio buffers.
113  */
114  void (*scalar_dequant)(struct cook *q, int index, int quant_index,
115  int *subband_coef_index, int *subband_coef_sign,
116  float *mlt_p);
117 
118  void (*decouple)(struct cook *q,
119  COOKSubpacket *p,
120  int subband,
121  float f1, float f2,
122  float *decode_buffer,
123  float *mlt_buffer1, float *mlt_buffer2);
124 
125  void (*imlt_window)(struct cook *q, float *buffer1,
126  cook_gains *gains_ptr, float *previous_buffer);
127 
128  void (*interpolate)(struct cook *q, float *buffer,
129  int gain_index, int gain_index_next);
130 
131  void (*saturate_output)(struct cook *q, float *out);
132 
136  /* stream data */
139  /* states */
142 
143  /* transform data */
146  float* mlt_window;
147 
148  /* VLC data */
150  VLC sqvh[7]; // scalar quantization
151 
152  /* generate tables and related variables */
154  float gain_table[31];
155 
156  /* data buffers */
157 
160  float decode_buffer_1[1024];
161  float decode_buffer_2[1024];
162  float decode_buffer_0[1060]; /* static allocation for joint decode */
163 
164  const float *cplscales[5];
167 } COOKContext;
168 
169 static float pow2tab[127];
170 static float rootpow2tab[127];
171 
172 /*************** init functions ***************/
173 
174 /* table generator */
175 static av_cold void init_pow2table(void)
176 {
177  /* fast way of computing 2^i and 2^(0.5*i) for -63 <= i < 64 */
178  int i;
179  static const float exp2_tab[2] = {1, M_SQRT2};
180  float exp2_val = powf(2, -63);
181  float root_val = powf(2, -32);
182  for (i = -63; i < 64; i++) {
183  if (!(i & 1))
184  root_val *= 2;
185  pow2tab[63 + i] = exp2_val;
186  rootpow2tab[63 + i] = root_val * exp2_tab[i & 1];
187  exp2_val *= 2;
188  }
189 }
190 
191 /* table generator */
192 static av_cold void init_gain_table(COOKContext *q)
193 {
194  int i;
195  q->gain_size_factor = q->samples_per_channel / 8;
196  for (i = 0; i < 31; i++)
197  q->gain_table[i] = pow(pow2tab[i + 48],
198  (1.0 / (double) q->gain_size_factor));
199 }
200 
201 static av_cold int build_vlc(VLC *vlc, int nb_bits, const uint8_t counts[16],
202  const void *syms, int symbol_size, int offset,
203  void *logctx)
204 {
205  uint8_t lens[MAX_COOK_VLC_ENTRIES];
206  unsigned num = 0;
207 
208  for (int i = 0; i < 16; i++)
209  for (unsigned count = num + counts[i]; num < count; num++)
210  lens[num] = i + 1;
211 
212  return ff_vlc_init_from_lengths(vlc, nb_bits, num, lens, 1,
213  syms, symbol_size, symbol_size,
214  offset, 0, logctx);
215 }
216 
217 static av_cold int init_cook_vlc_tables(COOKContext *q)
218 {
219  int i, result;
220 
221  result = 0;
222  for (i = 0; i < 13; i++) {
223  result |= build_vlc(&q->envelope_quant_index[i], QUANT_VLC_BITS,
225  envelope_quant_index_huffsyms[i], 1, -12, q->avctx);
226  }
227  av_log(q->avctx, AV_LOG_DEBUG, "sqvh VLC init\n");
228  for (i = 0; i < 7; i++) {
229  int sym_size = 1 + (i == 3);
230  result |= build_vlc(&q->sqvh[i], vhvlcsize_tab[i],
231  cvh_huffcounts[i],
232  cvh_huffsyms[i], sym_size, 0, q->avctx);
233  }
234 
235  for (i = 0; i < q->num_subpackets; i++) {
236  if (q->subpacket[i].joint_stereo == 1) {
237  result |= build_vlc(&q->subpacket[i].channel_coupling, COUPLING_VLC_BITS,
238  ccpl_huffcounts[q->subpacket[i].js_vlc_bits - 2],
239  ccpl_huffsyms[q->subpacket[i].js_vlc_bits - 2], 1,
240  0, q->avctx);
241  av_log(q->avctx, AV_LOG_DEBUG, "subpacket %i Joint-stereo VLC used.\n", i);
242  }
243  }
244 
245  av_log(q->avctx, AV_LOG_DEBUG, "VLC tables initialized.\n");
246  return result;
247 }
248 
249 static av_cold int init_cook_mlt(COOKContext *q)
250 {
251  int j, ret;
252  int mlt_size = q->samples_per_channel;
253  const float scale = 1.0 / 32768.0;
254 
255  if (!(q->mlt_window = av_malloc_array(mlt_size, sizeof(*q->mlt_window))))
256  return AVERROR(ENOMEM);
257 
258  /* Initialize the MLT window: simple sine window. */
259  ff_sine_window_init(q->mlt_window, mlt_size);
260  for (j = 0; j < mlt_size; j++)
261  q->mlt_window[j] *= sqrt(2.0 / q->samples_per_channel);
262 
263  /* Initialize the MDCT. */
264  ret = av_tx_init(&q->mdct_ctx, &q->mdct_fn, AV_TX_FLOAT_MDCT,
265  1, mlt_size, &scale, AV_TX_FULL_IMDCT);
266  if (ret < 0)
267  return ret;
268 
269  return 0;
270 }
271 
272 static av_cold void init_cplscales_table(COOKContext *q)
273 {
274  int i;
275  for (i = 0; i < 5; i++)
276  q->cplscales[i] = cplscales[i];
277 }
278 
279 /*************** init functions end ***********/
280 
281 #define DECODE_BYTES_PAD1(bytes) (3 - ((bytes) + 3) % 4)
282 #define DECODE_BYTES_PAD2(bytes) ((bytes) % 4 + DECODE_BYTES_PAD1(2 * (bytes)))
283 
284 /**
285  * Cook indata decoding, every 32 bits are XORed with 0x37c511f2.
286  * Why? No idea, some checksum/error detection method maybe.
287  *
288  * Out buffer size: extra bytes are needed to cope with
289  * padding/misalignment.
290  * Subpackets passed to the decoder can contain two, consecutive
291  * half-subpackets, of identical but arbitrary size.
292  * 1234 1234 1234 1234 extraA extraB
293  * Case 1: AAAA BBBB 0 0
294  * Case 2: AAAA ABBB BB-- 3 3
295  * Case 3: AAAA AABB BBBB 2 2
296  * Case 4: AAAA AAAB BBBB BB-- 1 5
297  *
298  * Nice way to waste CPU cycles.
299  *
300  * @param inbuffer pointer to byte array of indata
301  * @param out pointer to byte array of outdata
302  * @param bytes number of bytes
303  */
304 static inline int decode_bytes(const uint8_t *inbuffer, uint8_t *out, int bytes)
305 {
306  static const uint32_t tab[4] = {
307  AV_BE2NE32C(0x37c511f2u), AV_BE2NE32C(0xf237c511u),
308  AV_BE2NE32C(0x11f237c5u), AV_BE2NE32C(0xc511f237u),
309  };
310  int i, off;
311  uint32_t c;
312  const uint32_t *buf;
313  uint32_t *obuf = (uint32_t *) out;
314  /* FIXME: 64 bit platforms would be able to do 64 bits at a time.
315  * I'm too lazy though, should be something like
316  * for (i = 0; i < bitamount / 64; i++)
317  * (int64_t) out[i] = 0x37c511f237c511f2 ^ av_be2ne64(int64_t) in[i]);
318  * Buffer alignment needs to be checked. */
319 
320  off = (intptr_t) inbuffer & 3;
321  buf = (const uint32_t *) (inbuffer - off);
322  c = tab[off];
323  bytes += 3 + off;
324  for (i = 0; i < bytes / 4; i++)
325  obuf[i] = c ^ buf[i];
326 
327  return off;
328 }
329 
331 {
332  int i;
333  COOKContext *q = avctx->priv_data;
334  av_log(avctx, AV_LOG_DEBUG, "Deallocating memory.\n");
335 
336  /* Free allocated memory buffers. */
337  av_freep(&q->mlt_window);
338  av_freep(&q->decoded_bytes_buffer);
339 
340  /* Free the transform. */
341  av_tx_uninit(&q->mdct_ctx);
342 
343  /* Free the VLC tables. */
344  for (i = 0; i < 13; i++)
345  ff_vlc_free(&q->envelope_quant_index[i]);
346  for (i = 0; i < 7; i++)
347  ff_vlc_free(&q->sqvh[i]);
348  for (i = 0; i < q->num_subpackets; i++)
349  ff_vlc_free(&q->subpacket[i].channel_coupling);
350 
351  av_log(avctx, AV_LOG_DEBUG, "Memory deallocated.\n");
352 
353  return 0;
354 }
355 
356 /**
357  * Fill the gain array for the timedomain quantization.
358  *
359  * @param gb pointer to the GetBitContext
360  * @param gaininfo array[9] of gain indexes
361  */
362 static void decode_gain_info(GetBitContext *gb, int *gaininfo)
363 {
364  int i, n;
365 
366  n = get_unary(gb, 0, get_bits_left(gb)); // amount of elements*2 to update
367 
368  i = 0;
369  while (n--) {
370  int index = get_bits(gb, 3);
371  int gain = get_bits1(gb) ? get_bits(gb, 4) - 7 : -1;
372 
373  while (i <= index)
374  gaininfo[i++] = gain;
375  }
376  while (i <= 8)
377  gaininfo[i++] = 0;
378 }
379 
380 /**
381  * Create the quant index table needed for the envelope.
382  *
383  * @param q pointer to the COOKContext
384  * @param quant_index_table pointer to the array
385  */
386 static int decode_envelope(COOKContext *q, COOKSubpacket *p,
387  int *quant_index_table)
388 {
389  int i, j, vlc_index;
390 
391  quant_index_table[0] = get_bits(&q->gb, 6) - 6; // This is used later in categorize
392 
393  for (i = 1; i < p->total_subbands; i++) {
394  vlc_index = i;
395  if (i >= p->js_subband_start * 2) {
396  vlc_index -= p->js_subband_start;
397  } else {
398  vlc_index /= 2;
399  if (vlc_index < 1)
400  vlc_index = 1;
401  }
402  if (vlc_index > 13)
403  vlc_index = 13; // the VLC tables >13 are identical to No. 13
404 
405  j = get_vlc2(&q->gb, q->envelope_quant_index[vlc_index - 1].table,
406  QUANT_VLC_BITS, 2);
407  quant_index_table[i] = quant_index_table[i - 1] + j; // differential encoding
408  if (quant_index_table[i] > 63 || quant_index_table[i] < -63) {
409  av_log(q->avctx, AV_LOG_ERROR,
410  "Invalid quantizer %d at position %d, outside [-63, 63] range\n",
411  quant_index_table[i], i);
412  return AVERROR_INVALIDDATA;
413  }
414  }
415 
416  return 0;
417 }
418 
419 /**
420  * Calculate the category and category_index vector.
421  *
422  * @param q pointer to the COOKContext
423  * @param quant_index_table pointer to the array
424  * @param category pointer to the category array
425  * @param category_index pointer to the category_index array
426  */
427 static void categorize(COOKContext *q, COOKSubpacket *p, const int *quant_index_table,
428  int *category, int *category_index)
429 {
430  int exp_idx, bias, tmpbias1, tmpbias2, bits_left, num_bits, index, v, i, j;
431  int exp_index2[102] = { 0 };
432  int exp_index1[102] = { 0 };
433 
434  int tmp_categorize_array[128 * 2] = { 0 };
435  int tmp_categorize_array1_idx = p->numvector_size;
436  int tmp_categorize_array2_idx = p->numvector_size;
437 
439 
440  if (bits_left > q->samples_per_channel)
441  bits_left = q->samples_per_channel +
442  ((bits_left - q->samples_per_channel) * 5) / 8;
443 
444  bias = -32;
445 
446  /* Estimate bias. */
447  for (i = 32; i > 0; i = i / 2) {
448  num_bits = 0;
449  index = 0;
450  for (j = p->total_subbands; j > 0; j--) {
451  exp_idx = av_clip_uintp2((i - quant_index_table[index] + bias) / 2, 3);
452  index++;
453  num_bits += expbits_tab[exp_idx];
454  }
455  if (num_bits >= bits_left - 32)
456  bias += i;
457  }
458 
459  /* Calculate total number of bits. */
460  num_bits = 0;
461  for (i = 0; i < p->total_subbands; i++) {
462  exp_idx = av_clip_uintp2((bias - quant_index_table[i]) / 2, 3);
463  num_bits += expbits_tab[exp_idx];
464  exp_index1[i] = exp_idx;
465  exp_index2[i] = exp_idx;
466  }
467  tmpbias1 = tmpbias2 = num_bits;
468 
469  for (j = 1; j < p->numvector_size; j++) {
470  if (tmpbias1 + tmpbias2 > 2 * bits_left) { /* ---> */
471  int max = -999999;
472  index = -1;
473  for (i = 0; i < p->total_subbands; i++) {
474  if (exp_index1[i] < 7) {
475  v = (-2 * exp_index1[i]) - quant_index_table[i] + bias;
476  if (v >= max) {
477  max = v;
478  index = i;
479  }
480  }
481  }
482  if (index == -1)
483  break;
484  tmp_categorize_array[tmp_categorize_array1_idx++] = index;
485  tmpbias1 -= expbits_tab[exp_index1[index]] -
486  expbits_tab[exp_index1[index] + 1];
487  ++exp_index1[index];
488  } else { /* <--- */
489  int min = 999999;
490  index = -1;
491  for (i = 0; i < p->total_subbands; i++) {
492  if (exp_index2[i] > 0) {
493  v = (-2 * exp_index2[i]) - quant_index_table[i] + bias;
494  if (v < min) {
495  min = v;
496  index = i;
497  }
498  }
499  }
500  if (index == -1)
501  break;
502  tmp_categorize_array[--tmp_categorize_array2_idx] = index;
503  tmpbias2 -= expbits_tab[exp_index2[index]] -
504  expbits_tab[exp_index2[index] - 1];
505  --exp_index2[index];
506  }
507  }
508 
509  for (i = 0; i < p->total_subbands; i++)
510  category[i] = exp_index2[i];
511 
512  for (i = 0; i < p->numvector_size - 1; i++)
513  category_index[i] = tmp_categorize_array[tmp_categorize_array2_idx++];
514 }
515 
516 
517 /**
518  * Expand the category vector.
519  *
520  * @param q pointer to the COOKContext
521  * @param category pointer to the category array
522  * @param category_index pointer to the category_index array
523  */
524 static inline void expand_category(COOKContext *q, int *category,
525  int *category_index)
526 {
527  int i;
528  for (i = 0; i < q->num_vectors; i++)
529  {
530  int idx = category_index[i];
531  if (++category[idx] >= FF_ARRAY_ELEMS(dither_tab))
532  --category[idx];
533  }
534 }
535 
536 /**
537  * The real requantization of the mltcoefs
538  *
539  * @param q pointer to the COOKContext
540  * @param index index
541  * @param quant_index quantisation index
542  * @param subband_coef_index array of indexes to quant_centroid_tab
543  * @param subband_coef_sign signs of coefficients
544  * @param mlt_p pointer into the mlt buffer
545  */
546 static void scalar_dequant_float(COOKContext *q, int index, int quant_index,
547  int *subband_coef_index, int *subband_coef_sign,
548  float *mlt_p)
549 {
550  int i;
551  float f1;
552 
553  for (i = 0; i < SUBBAND_SIZE; i++) {
554  if (subband_coef_index[i]) {
555  f1 = quant_centroid_tab[index][subband_coef_index[i]];
556  if (subband_coef_sign[i])
557  f1 = -f1;
558  } else {
559  /* noise coding if subband_coef_index[i] == 0 */
560  f1 = dither_tab[index];
561  if (av_lfg_get(&q->random_state) < 0x80000000)
562  f1 = -f1;
563  }
564  mlt_p[i] = f1 * rootpow2tab[quant_index + 63];
565  }
566 }
567 /**
568  * Unpack the subband_coef_index and subband_coef_sign vectors.
569  *
570  * @param q pointer to the COOKContext
571  * @param category pointer to the category array
572  * @param subband_coef_index array of indexes to quant_centroid_tab
573  * @param subband_coef_sign signs of coefficients
574  */
575 static int unpack_SQVH(COOKContext *q, COOKSubpacket *p, int category,
576  int *subband_coef_index, int *subband_coef_sign)
577 {
578  int i, j;
579  int vlc, vd, tmp, result;
580 
581  vd = vd_tab[category];
582  result = 0;
583  for (i = 0; i < vpr_tab[category]; i++) {
584  vlc = get_vlc2(&q->gb, q->sqvh[category].table, q->sqvh[category].bits, 3);
585  if (p->bits_per_subpacket < get_bits_count(&q->gb)) {
586  vlc = 0;
587  result = 1;
588  }
589  for (j = vd - 1; j >= 0; j--) {
590  tmp = (vlc * invradix_tab[category]) / 0x100000;
591  subband_coef_index[vd * i + j] = vlc - tmp * (kmax_tab[category] + 1);
592  vlc = tmp;
593  }
594  for (j = 0; j < vd; j++) {
595  if (subband_coef_index[i * vd + j]) {
596  if (get_bits_count(&q->gb) < p->bits_per_subpacket) {
597  subband_coef_sign[i * vd + j] = get_bits1(&q->gb);
598  } else {
599  result = 1;
600  subband_coef_sign[i * vd + j] = 0;
601  }
602  } else {
603  subband_coef_sign[i * vd + j] = 0;
604  }
605  }
606  }
607  return result;
608 }
609 
610 
611 /**
612  * Fill the mlt_buffer with mlt coefficients.
613  *
614  * @param q pointer to the COOKContext
615  * @param category pointer to the category array
616  * @param quant_index_table pointer to the array
617  * @param mlt_buffer pointer to mlt coefficients
618  */
619 static void decode_vectors(COOKContext *q, COOKSubpacket *p, int *category,
620  int *quant_index_table, float *mlt_buffer)
621 {
622  /* A zero in this table means that the subband coefficient is
623  random noise coded. */
624  int subband_coef_index[SUBBAND_SIZE];
625  /* A zero in this table means that the subband coefficient is a
626  positive multiplicator. */
627  int subband_coef_sign[SUBBAND_SIZE];
628  int band, j;
629  int index = 0;
630 
631  for (band = 0; band < p->total_subbands; band++) {
632  index = category[band];
633  if (category[band] < 7) {
634  if (unpack_SQVH(q, p, category[band], subband_coef_index, subband_coef_sign)) {
635  index = 7;
636  for (j = 0; j < p->total_subbands; j++)
637  category[band + j] = 7;
638  }
639  }
640  if (index >= 7) {
641  memset(subband_coef_index, 0, sizeof(subband_coef_index));
642  memset(subband_coef_sign, 0, sizeof(subband_coef_sign));
643  }
644  q->scalar_dequant(q, index, quant_index_table[band],
645  subband_coef_index, subband_coef_sign,
646  &mlt_buffer[band * SUBBAND_SIZE]);
647  }
648 
649  /* FIXME: should this be removed, or moved into loop above? */
650  if (p->total_subbands * SUBBAND_SIZE >= q->samples_per_channel)
651  return;
652 }
653 
654 
655 static int mono_decode(COOKContext *q, COOKSubpacket *p, float *mlt_buffer)
656 {
657  int category_index[128] = { 0 };
658  int category[128] = { 0 };
659  int quant_index_table[102];
660  int res, i;
661 
662  if ((res = decode_envelope(q, p, quant_index_table)) < 0)
663  return res;
664  q->num_vectors = get_bits(&q->gb, p->log2_numvector_size);
665  categorize(q, p, quant_index_table, category, category_index);
666  expand_category(q, category, category_index);
667  for (i=0; i<p->total_subbands; i++) {
668  if (category[i] > 7)
669  return AVERROR_INVALIDDATA;
670  }
671  decode_vectors(q, p, category, quant_index_table, mlt_buffer);
672 
673  return 0;
674 }
675 
676 
677 /**
678  * the actual requantization of the timedomain samples
679  *
680  * @param q pointer to the COOKContext
681  * @param buffer pointer to the timedomain buffer
682  * @param gain_index index for the block multiplier
683  * @param gain_index_next index for the next block multiplier
684  */
685 static void interpolate_float(COOKContext *q, float *buffer,
686  int gain_index, int gain_index_next)
687 {
688  int i;
689  float fc1, fc2;
690  fc1 = pow2tab[gain_index + 63];
691 
692  if (gain_index == gain_index_next) { // static gain
693  for (i = 0; i < q->gain_size_factor; i++)
694  buffer[i] *= fc1;
695  } else { // smooth gain
696  fc2 = q->gain_table[15 + (gain_index_next - gain_index)];
697  for (i = 0; i < q->gain_size_factor; i++) {
698  buffer[i] *= fc1;
699  fc1 *= fc2;
700  }
701  }
702 }
703 
704 /**
705  * Apply transform window, overlap buffers.
706  *
707  * @param q pointer to the COOKContext
708  * @param inbuffer pointer to the mltcoefficients
709  * @param gains_ptr current and previous gains
710  * @param previous_buffer pointer to the previous buffer to be used for overlapping
711  */
712 static void imlt_window_float(COOKContext *q, float *inbuffer,
713  cook_gains *gains_ptr, float *previous_buffer)
714 {
715  const float fc = pow2tab[gains_ptr->previous[0] + 63];
716  int i;
717  /* The weird thing here, is that the two halves of the time domain
718  * buffer are swapped. Also, the newest data, that we save away for
719  * next frame, has the wrong sign. Hence the subtraction below.
720  * Almost sounds like a complex conjugate/reverse data/FFT effect.
721  */
722 
723  /* Apply window and overlap */
724  for (i = 0; i < q->samples_per_channel; i++)
725  inbuffer[i] = inbuffer[i] * fc * q->mlt_window[i] -
726  previous_buffer[i] * q->mlt_window[q->samples_per_channel - 1 - i];
727 }
728 
729 /**
730  * The modulated lapped transform, this takes transform coefficients
731  * and transforms them into timedomain samples.
732  * Apply transform window, overlap buffers, apply gain profile
733  * and buffer management.
734  *
735  * @param q pointer to the COOKContext
736  * @param inbuffer pointer to the mltcoefficients
737  * @param gains_ptr current and previous gains
738  * @param previous_buffer pointer to the previous buffer to be used for overlapping
739  */
740 static void imlt_gain(COOKContext *q, float *inbuffer,
741  cook_gains *gains_ptr, float *previous_buffer)
742 {
743  float *buffer0 = q->mono_mdct_output;
744  float *buffer1 = q->mono_mdct_output + q->samples_per_channel;
745  int i;
746 
747  /* Inverse modified discrete cosine transform */
748  q->mdct_fn(q->mdct_ctx, q->mono_mdct_output, inbuffer, sizeof(float));
749 
750  q->imlt_window(q, buffer1, gains_ptr, previous_buffer);
751 
752  /* Apply gain profile */
753  for (i = 0; i < 8; i++)
754  if (gains_ptr->now[i] || gains_ptr->now[i + 1])
755  q->interpolate(q, &buffer1[q->gain_size_factor * i],
756  gains_ptr->now[i], gains_ptr->now[i + 1]);
757 
758  /* Save away the current to be previous block. */
759  memcpy(previous_buffer, buffer0,
760  q->samples_per_channel * sizeof(*previous_buffer));
761 }
762 
763 
764 /**
765  * function for getting the jointstereo coupling information
766  *
767  * @param q pointer to the COOKContext
768  * @param decouple_tab decoupling array
769  */
770 static int decouple_info(COOKContext *q, COOKSubpacket *p, int *decouple_tab)
771 {
772  int i;
773  int vlc = get_bits1(&q->gb);
774  int start = cplband[p->js_subband_start];
775  int end = cplband[p->subbands - 1];
776  int length = end - start + 1;
777 
778  if (start > end)
779  return 0;
780 
781  if (vlc)
782  for (i = 0; i < length; i++)
783  decouple_tab[start + i] = get_vlc2(&q->gb,
785  COUPLING_VLC_BITS, 3);
786  else
787  for (i = 0; i < length; i++) {
788  int v = get_bits(&q->gb, p->js_vlc_bits);
789  if (v == (1<<p->js_vlc_bits)-1) {
790  av_log(q->avctx, AV_LOG_ERROR, "decouple value too large\n");
791  return AVERROR_INVALIDDATA;
792  }
793  decouple_tab[start + i] = v;
794  }
795  return 0;
796 }
797 
798 /**
799  * function decouples a pair of signals from a single signal via multiplication.
800  *
801  * @param q pointer to the COOKContext
802  * @param subband index of the current subband
803  * @param f1 multiplier for channel 1 extraction
804  * @param f2 multiplier for channel 2 extraction
805  * @param decode_buffer input buffer
806  * @param mlt_buffer1 pointer to left channel mlt coefficients
807  * @param mlt_buffer2 pointer to right channel mlt coefficients
808  */
809 static void decouple_float(COOKContext *q,
810  COOKSubpacket *p,
811  int subband,
812  float f1, float f2,
813  float *decode_buffer,
814  float *mlt_buffer1, float *mlt_buffer2)
815 {
816  int j, tmp_idx;
817  for (j = 0; j < SUBBAND_SIZE; j++) {
818  tmp_idx = ((p->js_subband_start + subband) * SUBBAND_SIZE) + j;
819  mlt_buffer1[SUBBAND_SIZE * subband + j] = f1 * decode_buffer[tmp_idx];
820  mlt_buffer2[SUBBAND_SIZE * subband + j] = f2 * decode_buffer[tmp_idx];
821  }
822 }
823 
824 /**
825  * function for decoding joint stereo data
826  *
827  * @param q pointer to the COOKContext
828  * @param mlt_buffer1 pointer to left channel mlt coefficients
829  * @param mlt_buffer2 pointer to right channel mlt coefficients
830  */
831 static int joint_decode(COOKContext *q, COOKSubpacket *p,
832  float *mlt_buffer_left, float *mlt_buffer_right)
833 {
834  int i, j, res;
835  int decouple_tab[SUBBAND_SIZE] = { 0 };
836  float *decode_buffer = q->decode_buffer_0;
837  int idx, cpl_tmp;
838  float f1, f2;
839  const float *cplscale;
840 
841  memset(decode_buffer, 0, sizeof(q->decode_buffer_0));
842 
843  /* Make sure the buffers are zeroed out. */
844  memset(mlt_buffer_left, 0, 1024 * sizeof(*mlt_buffer_left));
845  memset(mlt_buffer_right, 0, 1024 * sizeof(*mlt_buffer_right));
846  if ((res = decouple_info(q, p, decouple_tab)) < 0)
847  return res;
848  if ((res = mono_decode(q, p, decode_buffer)) < 0)
849  return res;
850  /* The two channels are stored interleaved in decode_buffer. */
851  for (i = 0; i < p->js_subband_start; i++) {
852  for (j = 0; j < SUBBAND_SIZE; j++) {
853  mlt_buffer_left[i * 20 + j] = decode_buffer[i * 40 + j];
854  mlt_buffer_right[i * 20 + j] = decode_buffer[i * 40 + 20 + j];
855  }
856  }
857 
858  /* When we reach js_subband_start (the higher frequencies)
859  the coefficients are stored in a coupling scheme. */
860  idx = (1 << p->js_vlc_bits) - 1;
861  for (i = p->js_subband_start; i < p->subbands; i++) {
862  cpl_tmp = cplband[i];
863  idx -= decouple_tab[cpl_tmp];
864  cplscale = q->cplscales[p->js_vlc_bits - 2]; // choose decoupler table
865  f1 = cplscale[decouple_tab[cpl_tmp] + 1];
866  f2 = cplscale[idx];
867  q->decouple(q, p, i, f1, f2, decode_buffer,
868  mlt_buffer_left, mlt_buffer_right);
869  idx = (1 << p->js_vlc_bits) - 1;
870  }
871 
872  return 0;
873 }
874 
875 /**
876  * First part of subpacket decoding:
877  * decode raw stream bytes and read gain info.
878  *
879  * @param q pointer to the COOKContext
880  * @param inbuffer pointer to raw stream data
881  * @param gains_ptr array of current/prev gain pointers
882  */
883 static inline void decode_bytes_and_gain(COOKContext *q, COOKSubpacket *p,
884  const uint8_t *inbuffer,
885  cook_gains *gains_ptr)
886 {
887  int offset;
888 
889  offset = decode_bytes(inbuffer, q->decoded_bytes_buffer,
890  p->bits_per_subpacket / 8);
891  init_get_bits(&q->gb, q->decoded_bytes_buffer + offset,
892  p->bits_per_subpacket);
893  decode_gain_info(&q->gb, gains_ptr->now);
894 
895  /* Swap current and previous gains */
896  FFSWAP(int *, gains_ptr->now, gains_ptr->previous);
897 }
898 
899 /**
900  * Saturate the output signal and interleave.
901  *
902  * @param q pointer to the COOKContext
903  * @param out pointer to the output vector
904  */
905 static void saturate_output_float(COOKContext *q, float *out)
906 {
907  q->adsp.vector_clipf(out, q->mono_mdct_output + q->samples_per_channel,
908  FFALIGN(q->samples_per_channel, 8), -1.0f, 1.0f);
909 }
910 
911 
912 /**
913  * Final part of subpacket decoding:
914  * Apply modulated lapped transform, gain compensation,
915  * clip and convert to integer.
916  *
917  * @param q pointer to the COOKContext
918  * @param decode_buffer pointer to the mlt coefficients
919  * @param gains_ptr array of current/prev gain pointers
920  * @param previous_buffer pointer to the previous buffer to be used for overlapping
921  * @param out pointer to the output buffer
922  */
923 static inline void mlt_compensate_output(COOKContext *q, float *decode_buffer,
924  cook_gains *gains_ptr, float *previous_buffer,
925  float *out)
926 {
927  imlt_gain(q, decode_buffer, gains_ptr, previous_buffer);
928  if (out)
929  q->saturate_output(q, out);
930 }
931 
932 
933 /**
934  * Cook subpacket decoding. This function returns one decoded subpacket,
935  * usually 1024 samples per channel.
936  *
937  * @param q pointer to the COOKContext
938  * @param inbuffer pointer to the inbuffer
939  * @param outbuffer pointer to the outbuffer
940  */
941 static int decode_subpacket(COOKContext *q, COOKSubpacket *p,
942  const uint8_t *inbuffer, float **outbuffer)
943 {
944  int sub_packet_size = p->size;
945  int res;
946 
947  memset(q->decode_buffer_1, 0, sizeof(q->decode_buffer_1));
948  decode_bytes_and_gain(q, p, inbuffer, &p->gains1);
949 
950  if (p->joint_stereo) {
951  if ((res = joint_decode(q, p, q->decode_buffer_1, q->decode_buffer_2)) < 0)
952  return res;
953  } else {
954  if ((res = mono_decode(q, p, q->decode_buffer_1)) < 0)
955  return res;
956 
957  if (p->num_channels == 2) {
958  decode_bytes_and_gain(q, p, inbuffer + sub_packet_size / 2, &p->gains2);
959  if ((res = mono_decode(q, p, q->decode_buffer_2)) < 0)
960  return res;
961  }
962  }
963 
964  mlt_compensate_output(q, q->decode_buffer_1, &p->gains1,
966  outbuffer ? outbuffer[p->ch_idx] : NULL);
967 
968  if (p->num_channels == 2) {
969  if (p->joint_stereo)
970  mlt_compensate_output(q, q->decode_buffer_2, &p->gains1,
972  outbuffer ? outbuffer[p->ch_idx + 1] : NULL);
973  else
974  mlt_compensate_output(q, q->decode_buffer_2, &p->gains2,
976  outbuffer ? outbuffer[p->ch_idx + 1] : NULL);
977  }
978 
979  return 0;
980 }
981 
982 
984  int *got_frame_ptr, AVPacket *avpkt)
985 {
986  const uint8_t *buf = avpkt->data;
987  int buf_size = avpkt->size;
988  COOKContext *q = avctx->priv_data;
989  float **samples = NULL;
990  int i, ret;
991  int offset = 0;
992  int chidx = 0;
993 
994  if (buf_size < avctx->block_align)
995  return buf_size;
996 
997  /* get output buffer */
998  if (q->discarded_packets >= 2) {
999  frame->nb_samples = q->samples_per_channel;
1000  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1001  return ret;
1002  samples = (float **)frame->extended_data;
1003  }
1004 
1005  /* estimate subpacket sizes */
1006  q->subpacket[0].size = avctx->block_align;
1007 
1008  for (i = 1; i < q->num_subpackets; i++) {
1009  q->subpacket[i].size = 2 * buf[avctx->block_align - q->num_subpackets + i];
1010  q->subpacket[0].size -= q->subpacket[i].size + 1;
1011  if (q->subpacket[0].size < 0) {
1013  "frame subpacket size total > avctx->block_align!\n");
1014  return AVERROR_INVALIDDATA;
1015  }
1016  }
1017 
1018  /* decode supbackets */
1019  for (i = 0; i < q->num_subpackets; i++) {
1020  q->subpacket[i].bits_per_subpacket = (q->subpacket[i].size * 8) >>
1021  q->subpacket[i].bits_per_subpdiv;
1022  q->subpacket[i].ch_idx = chidx;
1024  "subpacket[%i] size %i js %i %i block_align %i\n",
1025  i, q->subpacket[i].size, q->subpacket[i].joint_stereo, offset,
1026  avctx->block_align);
1027 
1028  if ((ret = decode_subpacket(q, &q->subpacket[i], buf + offset, samples)) < 0)
1029  return ret;
1030  offset += q->subpacket[i].size;
1031  chidx += q->subpacket[i].num_channels;
1032  av_log(avctx, AV_LOG_DEBUG, "subpacket[%i] %i %i\n",
1033  i, q->subpacket[i].size * 8, get_bits_count(&q->gb));
1034  }
1035 
1036  /* Discard the first two frames: no valid audio. */
1037  if (q->discarded_packets < 2) {
1038  q->discarded_packets++;
1039  *got_frame_ptr = 0;
1040  return avctx->block_align;
1041  }
1042 
1043  *got_frame_ptr = 1;
1044 
1045  return avctx->block_align;
1046 }
1047 
1048 static void dump_cook_context(COOKContext *q)
1049 {
1050  //int i=0;
1051 #define PRINT(a, b) ff_dlog(q->avctx, " %s = %d\n", a, b);
1052  ff_dlog(q->avctx, "COOKextradata\n");
1053  ff_dlog(q->avctx, "cookversion=%x\n", q->subpacket[0].cookversion);
1054  if (q->subpacket[0].cookversion > STEREO) {
1055  PRINT("js_subband_start", q->subpacket[0].js_subband_start);
1056  PRINT("js_vlc_bits", q->subpacket[0].js_vlc_bits);
1057  }
1058  ff_dlog(q->avctx, "COOKContext\n");
1059  PRINT("nb_channels", q->avctx->ch_layout.nb_channels);
1060  PRINT("bit_rate", (int)q->avctx->bit_rate);
1061  PRINT("sample_rate", q->avctx->sample_rate);
1062  PRINT("samples_per_channel", q->subpacket[0].samples_per_channel);
1063  PRINT("subbands", q->subpacket[0].subbands);
1064  PRINT("js_subband_start", q->subpacket[0].js_subband_start);
1065  PRINT("log2_numvector_size", q->subpacket[0].log2_numvector_size);
1066  PRINT("numvector_size", q->subpacket[0].numvector_size);
1067  PRINT("total_subbands", q->subpacket[0].total_subbands);
1068 }
1069 
1070 /**
1071  * Cook initialization
1072  *
1073  * @param avctx pointer to the AVCodecContext
1074  */
1076 {
1077  static AVOnce init_static_once = AV_ONCE_INIT;
1078  COOKContext *q = avctx->priv_data;
1080  int s = 0;
1081  unsigned int channel_mask = 0;
1082  int samples_per_frame = 0;
1083  int ret;
1085 
1086  q->avctx = avctx;
1087 
1088  /* Take care of the codec specific extradata. */
1089  if (avctx->extradata_size < 8) {
1090  av_log(avctx, AV_LOG_ERROR, "Necessary extradata missing!\n");
1091  return AVERROR_INVALIDDATA;
1092  }
1093  av_log(avctx, AV_LOG_DEBUG, "codecdata_length=%d\n", avctx->extradata_size);
1094 
1096 
1097  /* Take data from the AVCodecContext (RM container). */
1098  if (!channels) {
1099  av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
1100  return AVERROR_INVALIDDATA;
1101  }
1102 
1103  if (avctx->block_align >= INT_MAX / 8)
1104  return AVERROR(EINVAL);
1105 
1106  /* Initialize RNG. */
1107  av_lfg_init(&q->random_state, 0);
1108 
1109  ff_audiodsp_init(&q->adsp);
1110 
1111  while (bytestream2_get_bytes_left(&gb)) {
1112  if (s >= FFMIN(MAX_SUBPACKETS, avctx->block_align)) {
1114  return AVERROR_PATCHWELCOME;
1115  }
1116  /* 8 for mono, 16 for stereo, ? for multichannel
1117  Swap to right endianness so we don't need to care later on. */
1118  q->subpacket[s].cookversion = bytestream2_get_be32(&gb);
1119  samples_per_frame = bytestream2_get_be16(&gb);
1120  q->subpacket[s].subbands = bytestream2_get_be16(&gb);
1121  bytestream2_get_be32(&gb); // Unknown unused
1122  q->subpacket[s].js_subband_start = bytestream2_get_be16(&gb);
1123  if (q->subpacket[s].js_subband_start >= 51) {
1124  av_log(avctx, AV_LOG_ERROR, "js_subband_start %d is too large\n", q->subpacket[s].js_subband_start);
1125  return AVERROR_INVALIDDATA;
1126  }
1127  q->subpacket[s].js_vlc_bits = bytestream2_get_be16(&gb);
1128 
1129  /* Initialize extradata related variables. */
1130  q->subpacket[s].samples_per_channel = samples_per_frame / channels;
1131  q->subpacket[s].bits_per_subpacket = avctx->block_align * 8;
1132 
1133  /* Initialize default data states. */
1134  q->subpacket[s].log2_numvector_size = 5;
1135  q->subpacket[s].total_subbands = q->subpacket[s].subbands;
1136  q->subpacket[s].num_channels = 1;
1137 
1138  /* Initialize version-dependent variables */
1139 
1140  av_log(avctx, AV_LOG_DEBUG, "subpacket[%i].cookversion=%x\n", s,
1141  q->subpacket[s].cookversion);
1142  q->subpacket[s].joint_stereo = 0;
1143  switch (q->subpacket[s].cookversion) {
1144  case MONO:
1145  if (channels != 1) {
1146  avpriv_request_sample(avctx, "Container channels != 1");
1147  return AVERROR_PATCHWELCOME;
1148  }
1149  av_log(avctx, AV_LOG_DEBUG, "MONO\n");
1150  break;
1151  case STEREO:
1152  if (channels != 1) {
1153  q->subpacket[s].bits_per_subpdiv = 1;
1154  q->subpacket[s].num_channels = 2;
1155  }
1156  av_log(avctx, AV_LOG_DEBUG, "STEREO\n");
1157  break;
1158  case JOINT_STEREO:
1159  if (channels != 2) {
1160  avpriv_request_sample(avctx, "Container channels != 2");
1161  return AVERROR_PATCHWELCOME;
1162  }
1163  av_log(avctx, AV_LOG_DEBUG, "JOINT_STEREO\n");
1164  if (avctx->extradata_size >= 16) {
1165  q->subpacket[s].total_subbands = q->subpacket[s].subbands +
1166  q->subpacket[s].js_subband_start;
1167  q->subpacket[s].joint_stereo = 1;
1168  q->subpacket[s].num_channels = 2;
1169  }
1170  if (q->subpacket[s].samples_per_channel > 256) {
1171  q->subpacket[s].log2_numvector_size = 6;
1172  }
1173  if (q->subpacket[s].samples_per_channel > 512) {
1174  q->subpacket[s].log2_numvector_size = 7;
1175  }
1176  break;
1177  case MC_COOK:
1178  av_log(avctx, AV_LOG_DEBUG, "MULTI_CHANNEL\n");
1179  channel_mask |= q->subpacket[s].channel_mask = bytestream2_get_be32(&gb);
1180 
1181  if (av_popcount64(q->subpacket[s].channel_mask) > 1) {
1182  q->subpacket[s].total_subbands = q->subpacket[s].subbands +
1183  q->subpacket[s].js_subband_start;
1184  q->subpacket[s].joint_stereo = 1;
1185  q->subpacket[s].num_channels = 2;
1186  q->subpacket[s].samples_per_channel = samples_per_frame >> 1;
1187 
1188  if (q->subpacket[s].samples_per_channel > 256) {
1189  q->subpacket[s].log2_numvector_size = 6;
1190  }
1191  if (q->subpacket[s].samples_per_channel > 512) {
1192  q->subpacket[s].log2_numvector_size = 7;
1193  }
1194  } else
1195  q->subpacket[s].samples_per_channel = samples_per_frame;
1196 
1197  break;
1198  default:
1199  avpriv_request_sample(avctx, "Cook version %d",
1200  q->subpacket[s].cookversion);
1201  return AVERROR_PATCHWELCOME;
1202  }
1203 
1204  if (s > 1 && q->subpacket[s].samples_per_channel != q->samples_per_channel) {
1205  av_log(avctx, AV_LOG_ERROR, "different number of samples per channel!\n");
1206  return AVERROR_INVALIDDATA;
1207  } else
1208  q->samples_per_channel = q->subpacket[0].samples_per_channel;
1209 
1210 
1211  /* Initialize variable relations */
1212  q->subpacket[s].numvector_size = (1 << q->subpacket[s].log2_numvector_size);
1213 
1214  /* Try to catch some obviously faulty streams, otherwise it might be exploitable */
1215  if (q->subpacket[s].total_subbands > 53) {
1216  avpriv_request_sample(avctx, "total_subbands > 53");
1217  return AVERROR_PATCHWELCOME;
1218  }
1219 
1220  if ((q->subpacket[s].js_vlc_bits > 6) ||
1221  (q->subpacket[s].js_vlc_bits < 2 * q->subpacket[s].joint_stereo)) {
1222  av_log(avctx, AV_LOG_ERROR, "js_vlc_bits = %d, only >= %d and <= 6 allowed!\n",
1223  q->subpacket[s].js_vlc_bits, 2 * q->subpacket[s].joint_stereo);
1224  return AVERROR_INVALIDDATA;
1225  }
1226 
1227  if (q->subpacket[s].subbands > 50) {
1228  avpriv_request_sample(avctx, "subbands > 50");
1229  return AVERROR_PATCHWELCOME;
1230  }
1231  if (q->subpacket[s].subbands == 0) {
1232  avpriv_request_sample(avctx, "subbands = 0");
1233  return AVERROR_PATCHWELCOME;
1234  }
1235  q->subpacket[s].gains1.now = q->subpacket[s].gain_1;
1236  q->subpacket[s].gains1.previous = q->subpacket[s].gain_2;
1237  q->subpacket[s].gains2.now = q->subpacket[s].gain_3;
1238  q->subpacket[s].gains2.previous = q->subpacket[s].gain_4;
1239 
1240  if (q->num_subpackets + q->subpacket[s].num_channels > channels) {
1241  av_log(avctx, AV_LOG_ERROR, "Too many subpackets %d for channels %d\n", q->num_subpackets, channels);
1242  return AVERROR_INVALIDDATA;
1243  }
1244 
1245  q->num_subpackets++;
1246  s++;
1247  }
1248 
1249  /* Try to catch some obviously faulty streams, otherwise it might be exploitable */
1250  if (q->samples_per_channel != 256 && q->samples_per_channel != 512 &&
1251  q->samples_per_channel != 1024) {
1252  avpriv_request_sample(avctx, "samples_per_channel = %d",
1253  q->samples_per_channel);
1254  return AVERROR_PATCHWELCOME;
1255  }
1256 
1257  /* Generate tables */
1258  ff_thread_once(&init_static_once, init_pow2table);
1259  init_gain_table(q);
1261 
1262  if ((ret = init_cook_vlc_tables(q)))
1263  return ret;
1264 
1265  /* Pad the databuffer with:
1266  DECODE_BYTES_PAD1 or DECODE_BYTES_PAD2 for decode_bytes(),
1267  AV_INPUT_BUFFER_PADDING_SIZE, for the bitstreamreader. */
1268  q->decoded_bytes_buffer =
1272  if (!q->decoded_bytes_buffer)
1273  return AVERROR(ENOMEM);
1274 
1275  /* Initialize transform. */
1276  if ((ret = init_cook_mlt(q)))
1277  return ret;
1278 
1279  /* Initialize COOK signal arithmetic handling */
1280  if (1) {
1281  q->scalar_dequant = scalar_dequant_float;
1282  q->decouple = decouple_float;
1283  q->imlt_window = imlt_window_float;
1284  q->interpolate = interpolate_float;
1285  q->saturate_output = saturate_output_float;
1286  }
1287 
1290  if (channel_mask)
1291  av_channel_layout_from_mask(&avctx->ch_layout, channel_mask);
1292  else
1294 
1295 
1296  dump_cook_context(q);
1297 
1298  return 0;
1299 }
1300 
1302  .p.name = "cook",
1303  CODEC_LONG_NAME("Cook / Cooker / Gecko (RealAudio G2)"),
1304  .p.type = AVMEDIA_TYPE_AUDIO,
1305  .p.id = AV_CODEC_ID_COOK,
1306  .priv_data_size = sizeof(COOKContext),
1308  .close = cook_decode_close,
1310  .p.capabilities = AV_CODEC_CAP_DR1,
1311  .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1313  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
1314 };
decode_vectors
static void decode_vectors(COOKContext *q, COOKSubpacket *p, int *category, int *quant_index_table, float *mlt_buffer)
Fill the mlt_buffer with mlt coefficients.
Definition: cook.c:619
mono_decode
static int mono_decode(COOKContext *q, COOKSubpacket *p, float *mlt_buffer)
Definition: cook.c:655
AV_SAMPLE_FMT_FLTP
@ AV_SAMPLE_FMT_FLTP
float, planar
Definition: samplefmt.h:66
ff_vlc_init_from_lengths
int ff_vlc_init_from_lengths(VLC *vlc, int nb_bits, int nb_codes, const int8_t *lens, int lens_wrap, const void *symbols, int symbols_wrap, int symbols_size, int offset, int flags, void *logctx)
Build VLC decoding tables suitable for use with get_vlc2()
Definition: vlc.c:306
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
get_bits_left
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:695
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
COOKSubpacket::log2_numvector_size
int log2_numvector_size
Definition: cook.c:89
mem_internal.h
cook::gb
GetBitContext gb
Definition: cook.c:135
out
FILE * out
Definition: movenc.c:55
cook::mdct_fn
av_tx_fn mdct_fn
Definition: cook.c:145
cook_decode_init
static av_cold int cook_decode_init(AVCodecContext *avctx)
Cook initialization.
Definition: cook.c:1075
av_lfg_init
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
Definition: lfg.c:32
GetByteContext
Definition: bytestream.h:33
av_popcount64
#define av_popcount64
Definition: common.h:156
thread.h
av_clip_uintp2
#define av_clip_uintp2
Definition: common.h:123
init_pow2table
static av_cold void init_pow2table(void)
Definition: cook.c:175
decode_gain_info
static void decode_gain_info(GetBitContext *gb, int *gaininfo)
Fill the gain array for the timedomain quantization.
Definition: cook.c:362
cook::interpolate
void(* interpolate)(struct cook *q, float *buffer, int gain_index, int gain_index_next)
Definition: cook.c:128
AVTXContext
Definition: tx_priv.h:235
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:266
unpack_SQVH
static int unpack_SQVH(COOKContext *q, COOKSubpacket *p, int category, int *subband_coef_index, int *subband_coef_sign)
Unpack the subband_coef_index and subband_coef_sign vectors.
Definition: cook.c:575
cook::gain_size_factor
int gain_size_factor
Definition: cook.c:153
cook::gain_table
float gain_table[31]
Definition: cook.c:154
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:28
AVPacket::data
uint8_t * data
Definition: packet.h:524
cook_gains
Definition: cook.c:75
scalar_dequant_float
static void scalar_dequant_float(COOKContext *q, int index, int quant_index, int *subband_coef_index, int *subband_coef_sign, float *mlt_p)
The real requantization of the mltcoefs.
Definition: cook.c:546
FFCodec
Definition: codec_internal.h:126
ff_audiodsp_init
av_cold void ff_audiodsp_init(AudioDSPContext *c)
Definition: audiodsp.c:106
category
category
Definition: openal-dec.c:249
fc
#define fc(width, name, range_min, range_max)
Definition: cbs_av1.c:464
COOKSubpacket::joint_stereo
int joint_stereo
Definition: cook.c:92
STEREO
#define STEREO
Definition: cook.c:65
max
#define max(a, b)
Definition: cuda_runtime.h:33
subbands
subbands
Definition: aptx.h:37
cook::scalar_dequant
void(* scalar_dequant)(struct cook *q, int index, int quant_index, int *subband_coef_index, int *subband_coef_sign, float *mlt_p)
Definition: cook.c:114
COUPLING_VLC_BITS
#define COUPLING_VLC_BITS
Definition: cook.c:73
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:313
cook_decode_close
static av_cold int cook_decode_close(AVCodecContext *avctx)
Definition: cook.c:330
COOKSubpacket::js_subband_start
int js_subband_start
Definition: cook.c:86
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:514
DECODE_BYTES_PAD1
#define DECODE_BYTES_PAD1(bytes)
Definition: cook.c:281
av_tx_init
av_cold int av_tx_init(AVTXContext **ctx, av_tx_fn *tx, enum AVTXType type, int inv, int len, const void *scale, uint64_t flags)
Initialize a transform context with the given configuration (i)MDCTs with an odd length are currently...
Definition: tx.c:903
init_cook_mlt
static av_cold int init_cook_mlt(COOKContext *q)
Definition: cook.c:249
cook
Definition: cook.c:109
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
JOINT_STEREO
#define JOINT_STEREO
Definition: cook.c:66
expbits_tab
static const int expbits_tab[8]
Definition: cookdata.h:35
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
AVCodecContext::ch_layout
AVChannelLayout ch_layout
Audio channel layout.
Definition: avcodec.h:1065
GetBitContext
Definition: get_bits.h:108
cook::mdct_ctx
AVTXContext * mdct_ctx
Definition: cook.c:144
tab
static const struct twinvq_data tab
Definition: twinvq_data.h:10345
PRINT
#define PRINT(a, b)
decode_bytes
static int decode_bytes(const uint8_t *inbuffer, uint8_t *out, int bytes)
Cook indata decoding, every 32 bits are XORed with 0x37c511f2.
Definition: cook.c:304
COOKSubpacket::gain_3
int gain_3[9]
Definition: cook.c:105
decode_subpacket
static int decode_subpacket(COOKContext *q, COOKSubpacket *p, const uint8_t *inbuffer, float **outbuffer)
Cook subpacket decoding.
Definition: cook.c:941
dither_tab
static const float dither_tab[9]
Definition: cookdata.h:39
AV_BE2NE32C
#define AV_BE2NE32C(x)
Definition: bswap.h:105
COOKSubpacket::numvector_size
int numvector_size
Definition: cook.c:96
init_cplscales_table
static av_cold void init_cplscales_table(COOKContext *q)
Definition: cook.c:272
saturate_output_float
static void saturate_output_float(COOKContext *q, float *out)
Saturate the output signal and interleave.
Definition: cook.c:905
ff_thread_once
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:205
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
cook::num_subpackets
int num_subpackets
Definition: cook.c:165
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
av_tx_fn
void(* av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride)
Function pointer to a function to perform the transform.
Definition: tx.h:151
quant_centroid_tab
static const float quant_centroid_tab[7][14]
Definition: cookdata.h:43
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:524
AV_TX_FLOAT_MDCT
@ AV_TX_FLOAT_MDCT
Standard MDCT with a sample data type of float, double or int32_t, respecively.
Definition: tx.h:68
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:286
s
#define s(width, name)
Definition: cbs_vp9.c:198
cook::cplscales
const float * cplscales[5]
Definition: cook.c:164
init_cook_vlc_tables
static av_cold int init_cook_vlc_tables(COOKContext *q)
Definition: cook.c:217
av_lfg_get
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
Definition: lfg.h:53
vhvlcsize_tab
static const int vhvlcsize_tab[7]
Definition: cookdata.h:75
COOKSubpacket::samples_per_channel
int samples_per_channel
Definition: cook.c:88
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
av_channel_layout_from_mask
int av_channel_layout_from_mask(AVChannelLayout *channel_layout, uint64_t mask)
Initialize a native channel layout from a bitmask indicating which channels are present.
Definition: channel_layout.c:243
lfg.h
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
cook::decouple
void(* decouple)(struct cook *q, COOKSubpacket *p, int subband, float f1, float f2, float *decode_buffer, float *mlt_buffer1, float *mlt_buffer2)
Definition: cook.c:118
channels
channels
Definition: aptx.h:31
decode.h
get_bits.h
cook::decode_buffer_1
float decode_buffer_1[1024]
Definition: cook.c:160
COOKSubpacket::js_vlc_bits
int js_vlc_bits
Definition: cook.c:87
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
ff_cook_decoder
const FFCodec ff_cook_decoder
Definition: cook.c:1301
AV_TX_FULL_IMDCT
@ AV_TX_FULL_IMDCT
Performs a full inverse MDCT rather than leaving out samples that can be derived through symmetry.
Definition: tx.h:175
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:203
vd_tab
static const int vd_tab[7]
Definition: cookdata.h:61
result
and forward the result(frame or status change) to the corresponding input. If nothing is possible
NULL
#define NULL
Definition: coverity.c:32
bits_left
#define bits_left
Definition: bitstream.h:114
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
bias
static int bias(int x, int c)
Definition: vqcdec.c:115
imlt_window_float
static void imlt_window_float(COOKContext *q, float *inbuffer, cook_gains *gains_ptr, float *previous_buffer)
Apply transform window, overlap buffers.
Definition: cook.c:712
COOKSubpacket::bits_per_subpacket
int bits_per_subpacket
Definition: cook.c:93
decouple_float
static void decouple_float(COOKContext *q, COOKSubpacket *p, int subband, float f1, float f2, float *decode_buffer, float *mlt_buffer1, float *mlt_buffer2)
function decouples a pair of signals from a single signal via multiplication.
Definition: cook.c:809
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:388
dump_cook_context
static void dump_cook_context(COOKContext *q)
Definition: cook.c:1048
MC_COOK
#define MC_COOK
Definition: cook.c:67
COOKSubpacket::num_channels
int num_channels
Definition: cook.c:83
mlt_compensate_output
static void mlt_compensate_output(COOKContext *q, float *decode_buffer, cook_gains *gains_ptr, float *previous_buffer, float *out)
Final part of subpacket decoding: Apply modulated lapped transform, gain compensation,...
Definition: cook.c:923
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, const VLCElem *table, int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:652
AVOnce
#define AVOnce
Definition: thread.h:202
index
int index
Definition: gxfenc.c:90
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
vpr_tab
static const int vpr_tab[7]
Definition: cookdata.h:65
build_vlc
static av_cold int build_vlc(VLC *vlc, int nb_bits, const uint8_t counts[16], const void *syms, int symbol_size, int offset, void *logctx)
Definition: cook.c:201
get_unary
static int get_unary(GetBitContext *gb, int stop, int len)
Get unary code of limited length.
Definition: unary.h:46
bytestream2_get_bytes_left
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
cook::sqvh
VLC sqvh[7]
Definition: cook.c:150
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:28
cook::subpacket
COOKSubpacket subpacket[MAX_SUBPACKETS]
Definition: cook.c:166
cplscales
static const float *const cplscales[5]
Definition: cookdata.h:357
cvh_huffcounts
static const uint8_t cvh_huffcounts[7][16]
Definition: cookdata.h:125
AVLFG
Context structure for the Lagged Fibonacci PRNG.
Definition: lfg.h:33
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1575
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:525
powf
#define powf(x, y)
Definition: libm.h:50
cook::random_state
AVLFG random_state
Definition: cook.c:140
codec_internal.h
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem_internal.h:109
COOKSubpacket
Definition: cook.c:80
AVCodecContext::sample_fmt
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1057
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:56
COOKSubpacket::gains1
cook_gains gains1
Definition: cook.c:101
COOKSubpacket::ch_idx
int ch_idx
Definition: cook.c:81
MAX_SUBPACKETS
#define MAX_SUBPACKETS
Definition: cook.c:70
imlt_gain
static void imlt_gain(COOKContext *q, float *inbuffer, cook_gains *gains_ptr, float *previous_buffer)
The modulated lapped transform, this takes transform coefficients and transforms them into timedomain...
Definition: cook.c:740
COOKSubpacket::cookversion
int cookversion
Definition: cook.c:84
sinewin.h
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
COOKSubpacket::size
int size
Definition: cook.c:82
unary.h
av_tx_uninit
av_cold void av_tx_uninit(AVTXContext **ctx)
Frees a context and sets *ctx to NULL, does nothing when *ctx == NULL.
Definition: tx.c:295
COOKSubpacket::channel_mask
unsigned int channel_mask
Definition: cook.c:90
ff_sine_window_init
void ff_sine_window_init(float *window, int n)
Generate a sine window.
Definition: sinewin_tablegen.h:59
COOKSubpacket::gain_1
int gain_1[9]
Definition: cook.c:103
MAX_COOK_VLC_ENTRIES
#define MAX_COOK_VLC_ENTRIES
Definition: cookdata.h:73
av_channel_layout_default
void av_channel_layout_default(AVChannelLayout *ch_layout, int nb_channels)
Get the default channel layout for a given number of channels.
Definition: channel_layout.c:831
kmax_tab
static const int kmax_tab[7]
Definition: cookdata.h:57
cook::avctx
AVCodecContext * avctx
Definition: cook.c:133
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
COOKSubpacket::mono_previous_buffer1
float mono_previous_buffer1[1024]
Definition: cook.c:98
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:523
COOKSubpacket::subbands
int subbands
Definition: cook.c:85
QUANT_VLC_BITS
#define QUANT_VLC_BITS
Definition: cook.c:72
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:31
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
cook::samples_per_channel
int samples_per_channel
Definition: cook.c:138
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:256
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
decode_envelope
static int decode_envelope(COOKContext *q, COOKSubpacket *p, int *quant_index_table)
Create the quant index table needed for the envelope.
Definition: cook.c:386
cookdata.h
avcodec.h
MONO
#define MONO
Definition: cook.c:64
ff_vlc_free
void ff_vlc_free(VLC *vlc)
Definition: vlc.c:580
ret
ret
Definition: filter_design.txt:187
decouple_info
static int decouple_info(COOKContext *q, COOKSubpacket *p, int *decouple_tab)
function for getting the jointstereo coupling information
Definition: cook.c:770
pow2tab
static float pow2tab[127]
Definition: cook.c:169
AVCodecContext::block_align
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs.
Definition: avcodec.h:1083
FFSWAP
#define FFSWAP(type, a, b)
Definition: macros.h:52
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
interpolate_float
static void interpolate_float(COOKContext *q, float *buffer, int gain_index, int gain_index_next)
the actual requantization of the timedomain samples
Definition: cook.c:685
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
AVCodecContext
main external API structure.
Definition: avcodec.h:445
cook::mlt_window
float * mlt_window
Definition: cook.c:146
channel_layout.h
rootpow2tab
static float rootpow2tab[127]
Definition: cook.c:170
buffer
the frame and frame reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFrame structures Several references can point to the same frame buffer
Definition: filter_design.txt:49
cook::num_vectors
int num_vectors
Definition: cook.c:137
ccpl_huffsyms
static const uint8_t *const ccpl_huffsyms[5]
Definition: cookdata.h:278
VLC
Definition: vlc.h:36
COOKSubpacket::mono_previous_buffer2
float mono_previous_buffer2[1024]
Definition: cook.c:99
av_channel_layout_uninit
void av_channel_layout_uninit(AVChannelLayout *channel_layout)
Free any allocated data in the channel layout and reset the channel count to 0.
Definition: channel_layout.c:433
cook::decoded_bytes_buffer
uint8_t * decoded_bytes_buffer
Definition: cook.c:158
cook_decode_frame
static int cook_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)
Definition: cook.c:983
cook_gains::previous
int * previous
Definition: cook.c:77
init_gain_table
static av_cold void init_gain_table(COOKContext *q)
Definition: cook.c:192
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:8
VLC::table
VLCElem * table
Definition: vlc.h:38
COOKSubpacket::gains2
cook_gains gains2
Definition: cook.c:102
joint_decode
static int joint_decode(COOKContext *q, COOKSubpacket *p, float *mlt_buffer_left, float *mlt_buffer_right)
function for decoding joint stereo data
Definition: cook.c:831
SUBBAND_SIZE
#define SUBBAND_SIZE
Definition: cook.c:69
envelope_quant_index_huffcounts
static const uint8_t envelope_quant_index_huffcounts[13][16]
Definition: cookdata.h:79
cook::envelope_quant_index
VLC envelope_quant_index[13]
Definition: cook.c:149
cook::imlt_window
void(* imlt_window)(struct cook *q, float *buffer1, cook_gains *gains_ptr, float *previous_buffer)
Definition: cook.c:125
audiodsp.h
mem.h
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
M_SQRT2
#define M_SQRT2
Definition: mathematics.h:109
COOKSubpacket::gain_2
int gain_2[9]
Definition: cook.c:104
AudioDSPContext
Definition: audiodsp.h:24
cook_gains::now
int * now
Definition: cook.c:76
scale
static void scale(int *out, const int *in, const int w, const int h, const int shift)
Definition: intra.c:291
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
AVPacket
This structure stores compressed data.
Definition: packet.h:501
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
ccpl_huffcounts
static const uint8_t ccpl_huffcounts[5][16]
Definition: cookdata.h:270
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
cook::saturate_output
void(* saturate_output)(struct cook *q, float *out)
Definition: cook.c:131
COOKSubpacket::total_subbands
int total_subbands
Definition: cook.c:95
cvh_huffsyms
static const void *const cvh_huffsyms[7]
Definition: cookdata.h:241
cook::decode_buffer_0
float decode_buffer_0[1060]
Definition: cook.c:162
bytestream.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
categorize
static void categorize(COOKContext *q, COOKSubpacket *p, const int *quant_index_table, int *category, int *category_index)
Calculate the category and category_index vector.
Definition: cook.c:427
cook::discarded_packets
int discarded_packets
Definition: cook.c:141
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AV_CODEC_ID_COOK
@ AV_CODEC_ID_COOK
Definition: codec_id.h:460
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
cplband
static const int cplband[51]
Definition: cookdata.h:285
COOKSubpacket::gain_4
int gain_4[9]
Definition: cook.c:106
cook::mono_mdct_output
float mono_mdct_output[2048]
Definition: cook.c:159
envelope_quant_index_huffsyms
static const uint8_t envelope_quant_index_huffsyms[13][24]
Definition: cookdata.h:95
cook::decode_buffer_2
float decode_buffer_2[1024]
Definition: cook.c:161
expand_category
static void expand_category(COOKContext *q, int *category, int *category_index)
Expand the category vector.
Definition: cook.c:524
tx.h
cook::adsp
AudioDSPContext adsp
Definition: cook.c:134
COOKSubpacket::bits_per_subpdiv
int bits_per_subpdiv
Definition: cook.c:94
invradix_tab
static const int invradix_tab[7]
Definition: cookdata.h:53
min
float min
Definition: vorbis_enc_data.h:429
COOKSubpacket::channel_coupling
VLC channel_coupling
Definition: cook.c:91
decode_bytes_and_gain
static void decode_bytes_and_gain(COOKContext *q, COOKSubpacket *p, const uint8_t *inbuffer, cook_gains *gains_ptr)
First part of subpacket decoding: decode raw stream bytes and read gain info.
Definition: cook.c:883