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vorbisdec.c
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1 /**
2  * @file
3  * Vorbis I decoder
4  * @author Denes Balatoni ( dbalatoni programozo hu )
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  * Vorbis I decoder
26  * @author Denes Balatoni ( dbalatoni programozo hu )
27  */
28 
29 #include <inttypes.h>
30 #include <math.h>
31 
32 #define BITSTREAM_READER_LE
33 #include "libavutil/float_dsp.h"
34 #include "libavutil/avassert.h"
35 #include "avcodec.h"
36 #include "get_bits.h"
37 #include "fft.h"
38 #include "fmtconvert.h"
39 #include "internal.h"
40 
41 #include "vorbis.h"
42 #include "vorbisdsp.h"
43 #include "xiph.h"
44 
45 #define V_NB_BITS 8
46 #define V_NB_BITS2 11
47 #define V_MAX_VLCS (1 << 16)
48 #define V_MAX_PARTITIONS (1 << 20)
49 
50 typedef struct {
51  uint8_t dimensions;
52  uint8_t lookup_type;
53  uint8_t maxdepth;
54  VLC vlc;
55  float *codevectors;
56  unsigned int nb_bits;
57 } vorbis_codebook;
58 
59 typedef union vorbis_floor_u vorbis_floor_data;
60 typedef struct vorbis_floor0_s vorbis_floor0;
61 typedef struct vorbis_floor1_s vorbis_floor1;
62 struct vorbis_context_s;
63 typedef
64 int (* vorbis_floor_decode_func)
65  (struct vorbis_context_s *, vorbis_floor_data *, float *);
66 typedef struct {
67  uint8_t floor_type;
68  vorbis_floor_decode_func decode;
69  union vorbis_floor_u {
70  struct vorbis_floor0_s {
71  uint8_t order;
72  uint16_t rate;
73  uint16_t bark_map_size;
74  int32_t *map[2];
75  uint32_t map_size[2];
76  uint8_t amplitude_bits;
77  uint8_t amplitude_offset;
78  uint8_t num_books;
79  uint8_t *book_list;
80  float *lsp;
81  } t0;
82  struct vorbis_floor1_s {
83  uint8_t partitions;
84  uint8_t partition_class[32];
85  uint8_t class_dimensions[16];
86  uint8_t class_subclasses[16];
87  uint8_t class_masterbook[16];
88  int16_t subclass_books[16][8];
89  uint8_t multiplier;
90  uint16_t x_list_dim;
91  vorbis_floor1_entry *list;
92  } t1;
93  } data;
94 } vorbis_floor;
95 
96 typedef struct {
97  uint16_t type;
98  uint32_t begin;
99  uint32_t end;
100  unsigned partition_size;
101  uint8_t classifications;
102  uint8_t classbook;
103  int16_t books[64][8];
104  uint8_t maxpass;
105  uint16_t ptns_to_read;
106  uint8_t *classifs;
107 } vorbis_residue;
108 
109 typedef struct {
110  uint8_t submaps;
111  uint16_t coupling_steps;
112  uint8_t *magnitude;
113  uint8_t *angle;
114  uint8_t *mux;
115  uint8_t submap_floor[16];
116  uint8_t submap_residue[16];
117 } vorbis_mapping;
118 
119 typedef struct {
120  uint8_t blockflag;
121  uint16_t windowtype;
122  uint16_t transformtype;
123  uint8_t mapping;
124 } vorbis_mode;
125 
126 typedef struct vorbis_context_s {
127  AVCodecContext *avctx;
128  GetBitContext gb;
129  VorbisDSPContext dsp;
130  AVFloatDSPContext fdsp;
131  FmtConvertContext fmt_conv;
132 
133  FFTContext mdct[2];
134  uint8_t first_frame;
135  uint32_t version;
136  uint8_t audio_channels;
137  uint32_t audio_samplerate;
138  uint32_t bitrate_maximum;
139  uint32_t bitrate_nominal;
140  uint32_t bitrate_minimum;
141  uint32_t blocksize[2];
142  const float *win[2];
143  uint16_t codebook_count;
144  vorbis_codebook *codebooks;
145  uint8_t floor_count;
146  vorbis_floor *floors;
147  uint8_t residue_count;
148  vorbis_residue *residues;
149  uint8_t mapping_count;
150  vorbis_mapping *mappings;
151  uint8_t mode_count;
152  vorbis_mode *modes;
153  uint8_t mode_number; // mode number for the current packet
154  uint8_t previous_window;
155  float *channel_residues;
156  float *saved;
157 } vorbis_context;
158 
159 /* Helper functions */
160 
161 #define BARK(x) \
162  (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
163 
164 static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
165 #define VALIDATE_INDEX(idx, limit) \
166  if (idx >= limit) {\
167  av_log(vc->avctx, AV_LOG_ERROR,\
168  idx_err_str,\
169  (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
170  return AVERROR_INVALIDDATA;\
171  }
172 #define GET_VALIDATED_INDEX(idx, bits, limit) \
173  {\
174  idx = get_bits(gb, bits);\
175  VALIDATE_INDEX(idx, limit)\
176  }
177 
178 static float vorbisfloat2float(unsigned val)
179 {
180  double mant = val & 0x1fffff;
181  long exp = (val & 0x7fe00000L) >> 21;
182  if (val & 0x80000000)
183  mant = -mant;
184  return ldexp(mant, exp - 20 - 768);
185 }
186 
187 
188 // Free all allocated memory -----------------------------------------
189 
190 static void vorbis_free(vorbis_context *vc)
191 {
192  int i;
193 
194  av_freep(&vc->channel_residues);
195  av_freep(&vc->saved);
196 
197  if (vc->residues)
198  for (i = 0; i < vc->residue_count; i++)
199  av_free(vc->residues[i].classifs);
200  av_freep(&vc->residues);
201  av_freep(&vc->modes);
202 
203  ff_mdct_end(&vc->mdct[0]);
204  ff_mdct_end(&vc->mdct[1]);
205 
206  if (vc->codebooks)
207  for (i = 0; i < vc->codebook_count; ++i) {
208  av_free(vc->codebooks[i].codevectors);
209  ff_free_vlc(&vc->codebooks[i].vlc);
210  }
211  av_freep(&vc->codebooks);
212 
213  if (vc->floors)
214  for (i = 0; i < vc->floor_count; ++i) {
215  if (vc->floors[i].floor_type == 0) {
216  av_free(vc->floors[i].data.t0.map[0]);
217  av_free(vc->floors[i].data.t0.map[1]);
218  av_free(vc->floors[i].data.t0.book_list);
219  av_free(vc->floors[i].data.t0.lsp);
220  } else {
221  av_free(vc->floors[i].data.t1.list);
222  }
223  }
224  av_freep(&vc->floors);
225 
226  if (vc->mappings)
227  for (i = 0; i < vc->mapping_count; ++i) {
228  av_free(vc->mappings[i].magnitude);
229  av_free(vc->mappings[i].angle);
230  av_free(vc->mappings[i].mux);
231  }
232  av_freep(&vc->mappings);
233 }
234 
235 // Parse setup header -------------------------------------------------
236 
237 // Process codebooks part
238 
239 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
240 {
241  unsigned cb;
242  uint8_t *tmp_vlc_bits = NULL;
243  uint32_t *tmp_vlc_codes = NULL;
244  GetBitContext *gb = &vc->gb;
245  uint16_t *codebook_multiplicands = NULL;
246  int ret = 0;
247 
248  vc->codebook_count = get_bits(gb, 8) + 1;
249 
250  av_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);
251 
252  vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
253  tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
254  tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
255  codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
256  if (!vc->codebooks ||
257  !tmp_vlc_bits || !tmp_vlc_codes || !codebook_multiplicands) {
258  ret = AVERROR(ENOMEM);
259  goto error;
260  }
261 
262  for (cb = 0; cb < vc->codebook_count; ++cb) {
263  vorbis_codebook *codebook_setup = &vc->codebooks[cb];
264  unsigned ordered, t, entries, used_entries = 0;
265 
266  av_dlog(NULL, " %u. Codebook\n", cb);
267 
268  if (get_bits(gb, 24) != 0x564342) {
269  av_log(vc->avctx, AV_LOG_ERROR,
270  " %u. Codebook setup data corrupt.\n", cb);
271  ret = AVERROR_INVALIDDATA;
272  goto error;
273  }
274 
275  codebook_setup->dimensions=get_bits(gb, 16);
276  if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
277  av_log(vc->avctx, AV_LOG_ERROR,
278  " %u. Codebook's dimension is invalid (%d).\n",
279  cb, codebook_setup->dimensions);
280  ret = AVERROR_INVALIDDATA;
281  goto error;
282  }
283  entries = get_bits(gb, 24);
284  if (entries > V_MAX_VLCS) {
285  av_log(vc->avctx, AV_LOG_ERROR,
286  " %u. Codebook has too many entries (%u).\n",
287  cb, entries);
288  ret = AVERROR_INVALIDDATA;
289  goto error;
290  }
291 
292  ordered = get_bits1(gb);
293 
294  av_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
295  codebook_setup->dimensions, entries);
296 
297  if (!ordered) {
298  unsigned ce, flag;
299  unsigned sparse = get_bits1(gb);
300 
301  av_dlog(NULL, " not ordered \n");
302 
303  if (sparse) {
304  av_dlog(NULL, " sparse \n");
305 
306  used_entries = 0;
307  for (ce = 0; ce < entries; ++ce) {
308  flag = get_bits1(gb);
309  if (flag) {
310  tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
311  ++used_entries;
312  } else
313  tmp_vlc_bits[ce] = 0;
314  }
315  } else {
316  av_dlog(NULL, " not sparse \n");
317 
318  used_entries = entries;
319  for (ce = 0; ce < entries; ++ce)
320  tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
321  }
322  } else {
323  unsigned current_entry = 0;
324  unsigned current_length = get_bits(gb, 5) + 1;
325 
326  av_dlog(NULL, " ordered, current length: %u\n", current_length); //FIXME
327 
328  used_entries = entries;
329  for (; current_entry < used_entries && current_length <= 32; ++current_length) {
330  unsigned i, number;
331 
332  av_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
333 
334  number = get_bits(gb, ilog(entries - current_entry));
335 
336  av_dlog(NULL, " number: %u\n", number);
337 
338  for (i = current_entry; i < number+current_entry; ++i)
339  if (i < used_entries)
340  tmp_vlc_bits[i] = current_length;
341 
342  current_entry+=number;
343  }
344  if (current_entry>used_entries) {
345  av_log(vc->avctx, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
346  ret = AVERROR_INVALIDDATA;
347  goto error;
348  }
349  }
350 
351  codebook_setup->lookup_type = get_bits(gb, 4);
352 
353  av_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,
354  codebook_setup->lookup_type ? "vq" : "no lookup");
355 
356 // If the codebook is used for (inverse) VQ, calculate codevectors.
357 
358  if (codebook_setup->lookup_type == 1) {
359  unsigned i, j, k;
360  unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
361 
362  float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
363  float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
364  unsigned codebook_value_bits = get_bits(gb, 4) + 1;
365  unsigned codebook_sequence_p = get_bits1(gb);
366 
367  av_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
368  codebook_lookup_values);
369  av_dlog(NULL, " delta %f minmum %f \n",
370  codebook_delta_value, codebook_minimum_value);
371 
372  for (i = 0; i < codebook_lookup_values; ++i) {
373  codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
374 
375  av_dlog(NULL, " multiplicands*delta+minmum : %e \n",
376  (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
377  av_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);
378  }
379 
380 // Weed out unused vlcs and build codevector vector
381  codebook_setup->codevectors = used_entries ? av_mallocz(used_entries *
382  codebook_setup->dimensions *
383  sizeof(*codebook_setup->codevectors))
384  : NULL;
385  for (j = 0, i = 0; i < entries; ++i) {
386  unsigned dim = codebook_setup->dimensions;
387 
388  if (tmp_vlc_bits[i]) {
389  float last = 0.0;
390  unsigned lookup_offset = i;
391 
392  av_dlog(vc->avctx, "Lookup offset %u ,", i);
393 
394  for (k = 0; k < dim; ++k) {
395  unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;
396  codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
397  if (codebook_sequence_p)
398  last = codebook_setup->codevectors[j * dim + k];
399  lookup_offset/=codebook_lookup_values;
400  }
401  tmp_vlc_bits[j] = tmp_vlc_bits[i];
402 
403  av_dlog(vc->avctx, "real lookup offset %u, vector: ", j);
404  for (k = 0; k < dim; ++k)
405  av_dlog(vc->avctx, " %f ",
406  codebook_setup->codevectors[j * dim + k]);
407  av_dlog(vc->avctx, "\n");
408 
409  ++j;
410  }
411  }
412  if (j != used_entries) {
413  av_log(vc->avctx, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
414  ret = AVERROR_INVALIDDATA;
415  goto error;
416  }
417  entries = used_entries;
418  } else if (codebook_setup->lookup_type >= 2) {
419  av_log(vc->avctx, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
420  ret = AVERROR_INVALIDDATA;
421  goto error;
422  }
423 
424 // Initialize VLC table
425  if (entries <= 0) {
426  av_log(vc->avctx, AV_LOG_ERROR, "Invalid codebook entry count\n");
427  ret = AVERROR_INVALIDDATA;
428  goto error;
429  }
430  if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
431  av_log(vc->avctx, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
432  ret = AVERROR_INVALIDDATA;
433  goto error;
434  }
435  codebook_setup->maxdepth = 0;
436  for (t = 0; t < entries; ++t)
437  if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
438  codebook_setup->maxdepth = tmp_vlc_bits[t];
439 
440  if (codebook_setup->maxdepth > 3 * V_NB_BITS)
441  codebook_setup->nb_bits = V_NB_BITS2;
442  else
443  codebook_setup->nb_bits = V_NB_BITS;
444 
445  codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
446 
447  if ((ret = init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits,
448  entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits),
449  sizeof(*tmp_vlc_bits), tmp_vlc_codes,
450  sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),
451  INIT_VLC_LE))) {
452  av_log(vc->avctx, AV_LOG_ERROR, " Error generating vlc tables. \n");
453  goto error;
454  }
455  }
456 
457  av_free(tmp_vlc_bits);
458  av_free(tmp_vlc_codes);
459  av_free(codebook_multiplicands);
460  return 0;
461 
462 // Error:
463 error:
464  av_free(tmp_vlc_bits);
465  av_free(tmp_vlc_codes);
466  av_free(codebook_multiplicands);
467  return ret;
468 }
469 
470 // Process time domain transforms part (unused in Vorbis I)
471 
472 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
473 {
474  GetBitContext *gb = &vc->gb;
475  unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
476 
477  for (i = 0; i < vorbis_time_count; ++i) {
478  unsigned vorbis_tdtransform = get_bits(gb, 16);
479 
480  av_dlog(NULL, " Vorbis time domain transform %u: %u\n",
481  vorbis_time_count, vorbis_tdtransform);
482 
483  if (vorbis_tdtransform) {
484  av_log(vc->avctx, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
485  return AVERROR_INVALIDDATA;
486  }
487  }
488  return 0;
489 }
490 
491 // Process floors part
492 
493 static int vorbis_floor0_decode(vorbis_context *vc,
494  vorbis_floor_data *vfu, float *vec);
495 static int create_map(vorbis_context *vc, unsigned floor_number);
496 static int vorbis_floor1_decode(vorbis_context *vc,
497  vorbis_floor_data *vfu, float *vec);
498 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
499 {
500  GetBitContext *gb = &vc->gb;
501  int i, j, k, ret;
502 
503  vc->floor_count = get_bits(gb, 6) + 1;
504 
505  vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
506  if (!vc->floors)
507  return AVERROR(ENOMEM);
508 
509  for (i = 0; i < vc->floor_count; ++i) {
510  vorbis_floor *floor_setup = &vc->floors[i];
511 
512  floor_setup->floor_type = get_bits(gb, 16);
513 
514  av_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);
515 
516  if (floor_setup->floor_type == 1) {
517  int maximum_class = -1;
518  unsigned rangebits, rangemax, floor1_values = 2;
519 
520  floor_setup->decode = vorbis_floor1_decode;
521 
522  floor_setup->data.t1.partitions = get_bits(gb, 5);
523 
524  av_dlog(NULL, " %d.floor: %d partitions \n",
525  i, floor_setup->data.t1.partitions);
526 
527  for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
528  floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
529  if (floor_setup->data.t1.partition_class[j] > maximum_class)
530  maximum_class = floor_setup->data.t1.partition_class[j];
531 
532  av_dlog(NULL, " %d. floor %d partition class %d \n",
533  i, j, floor_setup->data.t1.partition_class[j]);
534 
535  }
536 
537  av_dlog(NULL, " maximum class %d \n", maximum_class);
538 
539  for (j = 0; j <= maximum_class; ++j) {
540  floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
541  floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
542 
543  av_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,
544  floor_setup->data.t1.class_dimensions[j],
545  floor_setup->data.t1.class_subclasses[j]);
546 
547  if (floor_setup->data.t1.class_subclasses[j]) {
548  GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
549 
550  av_dlog(NULL, " masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
551  }
552 
553  for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
554  int16_t bits = get_bits(gb, 8) - 1;
555  if (bits != -1)
556  VALIDATE_INDEX(bits, vc->codebook_count)
557  floor_setup->data.t1.subclass_books[j][k] = bits;
558 
559  av_dlog(NULL, " book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
560  }
561  }
562 
563  floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
564  floor_setup->data.t1.x_list_dim = 2;
565 
566  for (j = 0; j < floor_setup->data.t1.partitions; ++j)
567  floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
568 
569  floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim *
570  sizeof(*floor_setup->data.t1.list));
571  if (!floor_setup->data.t1.list)
572  return AVERROR(ENOMEM);
573 
574  rangebits = get_bits(gb, 4);
575  rangemax = (1 << rangebits);
576  if (rangemax > vc->blocksize[1] / 2) {
577  av_log(vc->avctx, AV_LOG_ERROR,
578  "Floor value is too large for blocksize: %u (%"PRIu32")\n",
579  rangemax, vc->blocksize[1] / 2);
580  return AVERROR_INVALIDDATA;
581  }
582  floor_setup->data.t1.list[0].x = 0;
583  floor_setup->data.t1.list[1].x = rangemax;
584 
585  for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
586  for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
587  floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
588 
589  av_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,
590  floor_setup->data.t1.list[floor1_values].x);
591  }
592  }
593 
594 // Precalculate order of x coordinates - needed for decode
595  if (ff_vorbis_ready_floor1_list(vc->avctx,
596  floor_setup->data.t1.list,
597  floor_setup->data.t1.x_list_dim)) {
598  return AVERROR_INVALIDDATA;
599  }
600  } else if (floor_setup->floor_type == 0) {
601  unsigned max_codebook_dim = 0;
602 
603  floor_setup->decode = vorbis_floor0_decode;
604 
605  floor_setup->data.t0.order = get_bits(gb, 8);
606  if (!floor_setup->data.t0.order) {
607  av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 order is 0.\n");
608  return AVERROR_INVALIDDATA;
609  }
610  floor_setup->data.t0.rate = get_bits(gb, 16);
611  if (!floor_setup->data.t0.rate) {
612  av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 rate is 0.\n");
613  return AVERROR_INVALIDDATA;
614  }
615  floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
616  if (!floor_setup->data.t0.bark_map_size) {
617  av_log(vc->avctx, AV_LOG_ERROR,
618  "Floor 0 bark map size is 0.\n");
619  return AVERROR_INVALIDDATA;
620  }
621  floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
622  floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
623  floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
624 
625  /* allocate mem for booklist */
626  floor_setup->data.t0.book_list =
627  av_malloc(floor_setup->data.t0.num_books);
628  if (!floor_setup->data.t0.book_list)
629  return AVERROR(ENOMEM);
630  /* read book indexes */
631  {
632  int idx;
633  unsigned book_idx;
634  for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
635  GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
636  floor_setup->data.t0.book_list[idx] = book_idx;
637  if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
638  max_codebook_dim = vc->codebooks[book_idx].dimensions;
639  }
640  }
641 
642  if ((ret = create_map(vc, i)) < 0)
643  return ret;
644 
645  /* codebook dim is for padding if codebook dim doesn't *
646  * divide order+1 then we need to read more data */
647  floor_setup->data.t0.lsp =
648  av_malloc((floor_setup->data.t0.order + 1 + max_codebook_dim)
649  * sizeof(*floor_setup->data.t0.lsp));
650  if (!floor_setup->data.t0.lsp)
651  return AVERROR(ENOMEM);
652 
653  /* debug output parsed headers */
654  av_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
655  av_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
656  av_dlog(NULL, "floor0 bark map size: %u\n",
657  floor_setup->data.t0.bark_map_size);
658  av_dlog(NULL, "floor0 amplitude bits: %u\n",
659  floor_setup->data.t0.amplitude_bits);
660  av_dlog(NULL, "floor0 amplitude offset: %u\n",
661  floor_setup->data.t0.amplitude_offset);
662  av_dlog(NULL, "floor0 number of books: %u\n",
663  floor_setup->data.t0.num_books);
664  av_dlog(NULL, "floor0 book list pointer: %p\n",
665  floor_setup->data.t0.book_list);
666  {
667  int idx;
668  for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
669  av_dlog(NULL, " Book %d: %u\n", idx + 1,
670  floor_setup->data.t0.book_list[idx]);
671  }
672  }
673  } else {
674  av_log(vc->avctx, AV_LOG_ERROR, "Invalid floor type!\n");
675  return AVERROR_INVALIDDATA;
676  }
677  }
678  return 0;
679 }
680 
681 // Process residues part
682 
683 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
684 {
685  GetBitContext *gb = &vc->gb;
686  unsigned i, j, k;
687 
688  vc->residue_count = get_bits(gb, 6)+1;
689  vc->residues = av_mallocz(vc->residue_count * sizeof(*vc->residues));
690  if (!vc->residues)
691  return AVERROR(ENOMEM);
692 
693  av_dlog(NULL, " There are %d residues. \n", vc->residue_count);
694 
695  for (i = 0; i < vc->residue_count; ++i) {
696  vorbis_residue *res_setup = &vc->residues[i];
697  uint8_t cascade[64];
698  unsigned high_bits, low_bits;
699 
700  res_setup->type = get_bits(gb, 16);
701 
702  av_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);
703 
704  res_setup->begin = get_bits(gb, 24);
705  res_setup->end = get_bits(gb, 24);
706  res_setup->partition_size = get_bits(gb, 24) + 1;
707  /* Validations to prevent a buffer overflow later. */
708  if (res_setup->begin>res_setup->end ||
709  res_setup->end > (res_setup->type == 2 ? vc->audio_channels : 1) * vc->blocksize[1] / 2 ||
710  (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
711  av_log(vc->avctx, AV_LOG_ERROR,
712  "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",
713  res_setup->type, res_setup->begin, res_setup->end,
714  res_setup->partition_size, vc->blocksize[1] / 2);
715  return AVERROR_INVALIDDATA;
716  }
717 
718  res_setup->classifications = get_bits(gb, 6) + 1;
719  GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
720 
721  res_setup->ptns_to_read =
722  (res_setup->end - res_setup->begin) / res_setup->partition_size;
723  res_setup->classifs = av_malloc(res_setup->ptns_to_read *
724  vc->audio_channels *
725  sizeof(*res_setup->classifs));
726  if (!res_setup->classifs)
727  return AVERROR(ENOMEM);
728 
729  av_dlog(NULL, " begin %d end %d part.size %d classif.s %d classbook %d \n",
730  res_setup->begin, res_setup->end, res_setup->partition_size,
731  res_setup->classifications, res_setup->classbook);
732 
733  for (j = 0; j < res_setup->classifications; ++j) {
734  high_bits = 0;
735  low_bits = get_bits(gb, 3);
736  if (get_bits1(gb))
737  high_bits = get_bits(gb, 5);
738  cascade[j] = (high_bits << 3) + low_bits;
739 
740  av_dlog(NULL, " %u class cascade depth: %d\n", j, ilog(cascade[j]));
741  }
742 
743  res_setup->maxpass = 0;
744  for (j = 0; j < res_setup->classifications; ++j) {
745  for (k = 0; k < 8; ++k) {
746  if (cascade[j]&(1 << k)) {
747  GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
748 
749  av_dlog(NULL, " %u class cascade depth %u book: %d\n",
750  j, k, res_setup->books[j][k]);
751 
752  if (k>res_setup->maxpass)
753  res_setup->maxpass = k;
754  } else {
755  res_setup->books[j][k] = -1;
756  }
757  }
758  }
759  }
760  return 0;
761 }
762 
763 // Process mappings part
764 
765 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
766 {
767  GetBitContext *gb = &vc->gb;
768  unsigned i, j;
769 
770  vc->mapping_count = get_bits(gb, 6)+1;
771  vc->mappings = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
772  if (!vc->mappings)
773  return AVERROR(ENOMEM);
774 
775  av_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);
776 
777  for (i = 0; i < vc->mapping_count; ++i) {
778  vorbis_mapping *mapping_setup = &vc->mappings[i];
779 
780  if (get_bits(gb, 16)) {
781  av_log(vc->avctx, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
782  return AVERROR_INVALIDDATA;
783  }
784  if (get_bits1(gb)) {
785  mapping_setup->submaps = get_bits(gb, 4) + 1;
786  } else {
787  mapping_setup->submaps = 1;
788  }
789 
790  if (get_bits1(gb)) {
791  mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
792  mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps *
793  sizeof(*mapping_setup->magnitude));
794  mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps *
795  sizeof(*mapping_setup->angle));
796  if (!mapping_setup->angle || !mapping_setup->magnitude)
797  return AVERROR(ENOMEM);
798 
799  for (j = 0; j < mapping_setup->coupling_steps; ++j) {
800  GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
801  GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels)
802  }
803  } else {
804  mapping_setup->coupling_steps = 0;
805  }
806 
807  av_dlog(NULL, " %u mapping coupling steps: %d\n",
808  i, mapping_setup->coupling_steps);
809 
810  if (get_bits(gb, 2)) {
811  av_log(vc->avctx, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
812  return AVERROR_INVALIDDATA; // following spec.
813  }
814 
815  if (mapping_setup->submaps>1) {
816  mapping_setup->mux = av_mallocz(vc->audio_channels *
817  sizeof(*mapping_setup->mux));
818  if (!mapping_setup->mux)
819  return AVERROR(ENOMEM);
820 
821  for (j = 0; j < vc->audio_channels; ++j)
822  mapping_setup->mux[j] = get_bits(gb, 4);
823  }
824 
825  for (j = 0; j < mapping_setup->submaps; ++j) {
826  skip_bits(gb, 8); // FIXME check?
827  GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count)
828  GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
829 
830  av_dlog(NULL, " %u mapping %u submap : floor %d, residue %d\n", i, j,
831  mapping_setup->submap_floor[j],
832  mapping_setup->submap_residue[j]);
833  }
834  }
835  return 0;
836 }
837 
838 // Process modes part
839 
840 static int create_map(vorbis_context *vc, unsigned floor_number)
841 {
842  vorbis_floor *floors = vc->floors;
843  vorbis_floor0 *vf;
844  int idx;
845  int blockflag, n;
846  int32_t *map;
847 
848  for (blockflag = 0; blockflag < 2; ++blockflag) {
849  n = vc->blocksize[blockflag] / 2;
850  floors[floor_number].data.t0.map[blockflag] =
851  av_malloc((n + 1) * sizeof(int32_t)); // n + sentinel
852  if (!floors[floor_number].data.t0.map[blockflag])
853  return AVERROR(ENOMEM);
854 
855  map = floors[floor_number].data.t0.map[blockflag];
856  vf = &floors[floor_number].data.t0;
857 
858  for (idx = 0; idx < n; ++idx) {
859  map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
860  (vf->bark_map_size / BARK(vf->rate / 2.0f)));
861  if (vf->bark_map_size-1 < map[idx])
862  map[idx] = vf->bark_map_size - 1;
863  }
864  map[n] = -1;
865  vf->map_size[blockflag] = n;
866  }
867 
868  for (idx = 0; idx <= n; ++idx) {
869  av_dlog(NULL, "floor0 map: map at pos %d is %d\n", idx, map[idx]);
870  }
871 
872  return 0;
873 }
874 
875 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
876 {
877  GetBitContext *gb = &vc->gb;
878  unsigned i;
879 
880  vc->mode_count = get_bits(gb, 6) + 1;
881  vc->modes = av_mallocz(vc->mode_count * sizeof(*vc->modes));
882  if (!vc->modes)
883  return AVERROR(ENOMEM);
884 
885  av_dlog(NULL, " There are %d modes.\n", vc->mode_count);
886 
887  for (i = 0; i < vc->mode_count; ++i) {
888  vorbis_mode *mode_setup = &vc->modes[i];
889 
890  mode_setup->blockflag = get_bits1(gb);
891  mode_setup->windowtype = get_bits(gb, 16); //FIXME check
892  mode_setup->transformtype = get_bits(gb, 16); //FIXME check
893  GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
894 
895  av_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
896  i, mode_setup->blockflag, mode_setup->windowtype,
897  mode_setup->transformtype, mode_setup->mapping);
898  }
899  return 0;
900 }
901 
902 // Process the whole setup header using the functions above
903 
904 static int vorbis_parse_setup_hdr(vorbis_context *vc)
905 {
906  GetBitContext *gb = &vc->gb;
907  int ret;
908 
909  if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
910  (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
911  (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
912  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
913  return AVERROR_INVALIDDATA;
914  }
915 
916  if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {
917  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
918  return ret;
919  }
920  if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {
921  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
922  return ret;
923  }
924  if ((ret = vorbis_parse_setup_hdr_floors(vc))) {
925  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
926  return ret;
927  }
928  if ((ret = vorbis_parse_setup_hdr_residues(vc))) {
929  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
930  return ret;
931  }
932  if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {
933  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
934  return ret;
935  }
936  if ((ret = vorbis_parse_setup_hdr_modes(vc))) {
937  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
938  return ret;
939  }
940  if (!get_bits1(gb)) {
941  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
942  return AVERROR_INVALIDDATA; // framing flag bit unset error
943  }
944 
945  return 0;
946 }
947 
948 // Process the identification header
949 
950 static int vorbis_parse_id_hdr(vorbis_context *vc)
951 {
952  GetBitContext *gb = &vc->gb;
953  unsigned bl0, bl1;
954 
955  if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
956  (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
957  (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
958  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
959  return AVERROR_INVALIDDATA;
960  }
961 
962  vc->version = get_bits_long(gb, 32); //FIXME check 0
963  vc->audio_channels = get_bits(gb, 8);
964  if (vc->audio_channels <= 0) {
965  av_log(vc->avctx, AV_LOG_ERROR, "Invalid number of channels\n");
966  return AVERROR_INVALIDDATA;
967  }
968  vc->audio_samplerate = get_bits_long(gb, 32);
969  if (vc->audio_samplerate <= 0) {
970  av_log(vc->avctx, AV_LOG_ERROR, "Invalid samplerate\n");
971  return AVERROR_INVALIDDATA;
972  }
973  vc->bitrate_maximum = get_bits_long(gb, 32);
974  vc->bitrate_nominal = get_bits_long(gb, 32);
975  vc->bitrate_minimum = get_bits_long(gb, 32);
976  bl0 = get_bits(gb, 4);
977  bl1 = get_bits(gb, 4);
978  if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
979  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
980  return AVERROR_INVALIDDATA;
981  }
982  vc->blocksize[0] = (1 << bl0);
983  vc->blocksize[1] = (1 << bl1);
984  vc->win[0] = ff_vorbis_vwin[bl0 - 6];
985  vc->win[1] = ff_vorbis_vwin[bl1 - 6];
986 
987  if ((get_bits1(gb)) == 0) {
988  av_log(vc->avctx, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
989  return AVERROR_INVALIDDATA;
990  }
991 
992  vc->channel_residues = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(*vc->channel_residues));
993  vc->saved = av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(*vc->saved));
994  if (!vc->channel_residues || !vc->saved)
995  return AVERROR(ENOMEM);
996 
997  vc->previous_window = 0;
998 
999  ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0);
1000  ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0);
1001 
1002  av_dlog(NULL, " vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",
1003  vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
1004 
1005 /*
1006  BLK = vc->blocksize[0];
1007  for (i = 0; i < BLK / 2; ++i) {
1008  vc->win[0][i] = sin(0.5*3.14159265358*(sin(((float)i + 0.5) / (float)BLK*3.14159265358))*(sin(((float)i + 0.5) / (float)BLK*3.14159265358)));
1009  }
1010 */
1011 
1012  return 0;
1013 }
1014 
1015 // Process the extradata using the functions above (identification header, setup header)
1016 
1017 static av_cold int vorbis_decode_init(AVCodecContext *avctx)
1018 {
1019  vorbis_context *vc = avctx->priv_data;
1020  uint8_t *headers = avctx->extradata;
1021  int headers_len = avctx->extradata_size;
1022  uint8_t *header_start[3];
1023  int header_len[3];
1024  GetBitContext *gb = &vc->gb;
1025  int hdr_type, ret;
1026 
1027  vc->avctx = avctx;
1028  ff_vorbisdsp_init(&vc->dsp);
1029  avpriv_float_dsp_init(&vc->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
1030  ff_fmt_convert_init(&vc->fmt_conv, avctx);
1031 
1032  avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
1033 
1034  if (!headers_len) {
1035  av_log(avctx, AV_LOG_ERROR, "Extradata missing.\n");
1036  return AVERROR_INVALIDDATA;
1037  }
1038 
1039  if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {
1040  av_log(avctx, AV_LOG_ERROR, "Extradata corrupt.\n");
1041  return ret;
1042  }
1043 
1044  init_get_bits(gb, header_start[0], header_len[0]*8);
1045  hdr_type = get_bits(gb, 8);
1046  if (hdr_type != 1) {
1047  av_log(avctx, AV_LOG_ERROR, "First header is not the id header.\n");
1048  return AVERROR_INVALIDDATA;
1049  }
1050  if ((ret = vorbis_parse_id_hdr(vc))) {
1051  av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1052  vorbis_free(vc);
1053  return ret;
1054  }
1055 
1056  init_get_bits(gb, header_start[2], header_len[2]*8);
1057  hdr_type = get_bits(gb, 8);
1058  if (hdr_type != 5) {
1059  av_log(avctx, AV_LOG_ERROR, "Third header is not the setup header.\n");
1060  vorbis_free(vc);
1061  return AVERROR_INVALIDDATA;
1062  }
1063  if ((ret = vorbis_parse_setup_hdr(vc))) {
1064  av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1065  vorbis_free(vc);
1066  return ret;
1067  }
1068 
1069  if (vc->audio_channels > 8)
1070  avctx->channel_layout = 0;
1071  else
1072  avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1073 
1074  avctx->channels = vc->audio_channels;
1075  avctx->sample_rate = vc->audio_samplerate;
1076 
1077  return 0;
1078 }
1079 
1080 // Decode audiopackets -------------------------------------------------
1081 
1082 // Read and decode floor
1083 
1084 static int vorbis_floor0_decode(vorbis_context *vc,
1085  vorbis_floor_data *vfu, float *vec)
1086 {
1087  vorbis_floor0 *vf = &vfu->t0;
1088  float *lsp = vf->lsp;
1089  unsigned amplitude, book_idx;
1090  unsigned blockflag = vc->modes[vc->mode_number].blockflag;
1091 
1092  if (!vf->amplitude_bits)
1093  return 1;
1094 
1095  amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1096  if (amplitude > 0) {
1097  float last = 0;
1098  unsigned idx, lsp_len = 0;
1099  vorbis_codebook codebook;
1100 
1101  book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1102  if (book_idx >= vf->num_books) {
1103  av_log(vc->avctx, AV_LOG_ERROR, "floor0 dec: booknumber too high!\n");
1104  book_idx = 0;
1105  }
1106  av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
1107  codebook = vc->codebooks[vf->book_list[book_idx]];
1108  /* Invalid codebook! */
1109  if (!codebook.codevectors)
1110  return AVERROR_INVALIDDATA;
1111 
1112  while (lsp_len<vf->order) {
1113  int vec_off;
1114 
1115  av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
1116  av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1117  /* read temp vector */
1118  vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1119  codebook.nb_bits, codebook.maxdepth)
1120  * codebook.dimensions;
1121  av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);
1122  /* copy each vector component and add last to it */
1123  for (idx = 0; idx < codebook.dimensions; ++idx)
1124  lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1125  last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1126 
1127  lsp_len += codebook.dimensions;
1128  }
1129  /* DEBUG: output lsp coeffs */
1130  {
1131  int idx;
1132  for (idx = 0; idx < lsp_len; ++idx)
1133  av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1134  }
1135 
1136  /* synthesize floor output vector */
1137  {
1138  int i;
1139  int order = vf->order;
1140  float wstep = M_PI / vf->bark_map_size;
1141 
1142  for (i = 0; i < order; i++)
1143  lsp[i] = 2.0f * cos(lsp[i]);
1144 
1145  av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
1146  vf->map_size[blockflag], order, wstep);
1147 
1148  i = 0;
1149  while (i < vf->map_size[blockflag]) {
1150  int j, iter_cond = vf->map[blockflag][i];
1151  float p = 0.5f;
1152  float q = 0.5f;
1153  float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1154 
1155  /* similar part for the q and p products */
1156  for (j = 0; j + 1 < order; j += 2) {
1157  q *= lsp[j] - two_cos_w;
1158  p *= lsp[j + 1] - two_cos_w;
1159  }
1160  if (j == order) { // even order
1161  p *= p * (2.0f - two_cos_w);
1162  q *= q * (2.0f + two_cos_w);
1163  } else { // odd order
1164  q *= two_cos_w-lsp[j]; // one more time for q
1165 
1166  /* final step and square */
1167  p *= p * (4.f - two_cos_w * two_cos_w);
1168  q *= q;
1169  }
1170 
1171  /* calculate linear floor value */
1172  q = exp((((amplitude*vf->amplitude_offset) /
1173  (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1174  - vf->amplitude_offset) * .11512925f);
1175 
1176  /* fill vector */
1177  do {
1178  vec[i] = q; ++i;
1179  } while (vf->map[blockflag][i] == iter_cond);
1180  }
1181  }
1182  } else {
1183  /* this channel is unused */
1184  return 1;
1185  }
1186 
1187  av_dlog(NULL, " Floor0 decoded\n");
1188 
1189  return 0;
1190 }
1191 
1192 static int vorbis_floor1_decode(vorbis_context *vc,
1193  vorbis_floor_data *vfu, float *vec)
1194 {
1195  vorbis_floor1 *vf = &vfu->t1;
1196  GetBitContext *gb = &vc->gb;
1197  uint16_t range_v[4] = { 256, 128, 86, 64 };
1198  unsigned range = range_v[vf->multiplier - 1];
1199  uint16_t floor1_Y[258];
1200  uint16_t floor1_Y_final[258];
1201  int floor1_flag[258];
1202  unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;
1203  int book, adx, ady, dy, off, predicted, err;
1204 
1205 
1206  if (!get_bits1(gb)) // silence
1207  return 1;
1208 
1209 // Read values (or differences) for the floor's points
1210 
1211  floor1_Y[0] = get_bits(gb, ilog(range - 1));
1212  floor1_Y[1] = get_bits(gb, ilog(range - 1));
1213 
1214  av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1215 
1216  offset = 2;
1217  for (i = 0; i < vf->partitions; ++i) {
1218  partition_class = vf->partition_class[i];
1219  cdim = vf->class_dimensions[partition_class];
1220  cbits = vf->class_subclasses[partition_class];
1221  csub = (1 << cbits) - 1;
1222  cval = 0;
1223 
1224  av_dlog(NULL, "Cbits %u\n", cbits);
1225 
1226  if (cbits) // this reads all subclasses for this partition's class
1227  cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,
1228  vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);
1229 
1230  for (j = 0; j < cdim; ++j) {
1231  book = vf->subclass_books[partition_class][cval & csub];
1232 
1233  av_dlog(NULL, "book %d Cbits %u cval %u bits:%d\n",
1234  book, cbits, cval, get_bits_count(gb));
1235 
1236  cval = cval >> cbits;
1237  if (book > -1) {
1238  floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1239  vc->codebooks[book].nb_bits, 3);
1240  } else {
1241  floor1_Y[offset+j] = 0;
1242  }
1243 
1244  av_dlog(NULL, " floor(%d) = %d \n",
1245  vf->list[offset+j].x, floor1_Y[offset+j]);
1246  }
1247  offset+=cdim;
1248  }
1249 
1250 // Amplitude calculation from the differences
1251 
1252  floor1_flag[0] = 1;
1253  floor1_flag[1] = 1;
1254  floor1_Y_final[0] = floor1_Y[0];
1255  floor1_Y_final[1] = floor1_Y[1];
1256 
1257  for (i = 2; i < vf->x_list_dim; ++i) {
1258  unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
1259 
1260  low_neigh_offs = vf->list[i].low;
1261  high_neigh_offs = vf->list[i].high;
1262  dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1263  adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1264  ady = FFABS(dy);
1265  err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1266  off = err / adx;
1267  if (dy < 0) {
1268  predicted = floor1_Y_final[low_neigh_offs] - off;
1269  } else {
1270  predicted = floor1_Y_final[low_neigh_offs] + off;
1271  } // render_point end
1272 
1273  val = floor1_Y[i];
1274  highroom = range-predicted;
1275  lowroom = predicted;
1276  if (highroom < lowroom) {
1277  room = highroom * 2;
1278  } else {
1279  room = lowroom * 2; // SPEC misspelling
1280  }
1281  if (val) {
1282  floor1_flag[low_neigh_offs] = 1;
1283  floor1_flag[high_neigh_offs] = 1;
1284  floor1_flag[i] = 1;
1285  if (val >= room) {
1286  if (highroom > lowroom) {
1287  floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);
1288  } else {
1289  floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);
1290  }
1291  } else {
1292  if (val & 1) {
1293  floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);
1294  } else {
1295  floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);
1296  }
1297  }
1298  } else {
1299  floor1_flag[i] = 0;
1300  floor1_Y_final[i] = av_clip_uint16(predicted);
1301  }
1302 
1303  av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",
1304  vf->list[i].x, floor1_Y_final[i], val);
1305  }
1306 
1307 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1308 
1309  ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1310 
1311  av_dlog(NULL, " Floor decoded\n");
1312 
1313  return 0;
1314 }
1315 
1316 // Read and decode residue
1317 
1318 static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1319  vorbis_residue *vr,
1320  unsigned ch,
1321  uint8_t *do_not_decode,
1322  float *vec,
1323  unsigned vlen,
1324  unsigned ch_left,
1325  int vr_type)
1326 {
1327  GetBitContext *gb = &vc->gb;
1328  unsigned c_p_c = vc->codebooks[vr->classbook].dimensions;
1329  unsigned ptns_to_read = vr->ptns_to_read;
1330  uint8_t *classifs = vr->classifs;
1331  unsigned pass, ch_used, i, j, k, l;
1332  unsigned max_output = (ch - 1) * vlen;
1333 
1334  if (vr_type == 2) {
1335  for (j = 1; j < ch; ++j)
1336  do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1337  if (do_not_decode[0])
1338  return 0;
1339  ch_used = 1;
1340  max_output += vr->end / ch;
1341  } else {
1342  ch_used = ch;
1343  max_output += vr->end;
1344  }
1345 
1346  if (max_output > ch_left * vlen) {
1347  av_log(vc->avctx, AV_LOG_ERROR, "Insufficient output buffer\n");
1348  return -1;
1349  }
1350 
1351  av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1352 
1353  for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1354  uint16_t voffset, partition_count, j_times_ptns_to_read;
1355 
1356  voffset = vr->begin;
1357  for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1358  if (!pass) {
1359  unsigned inverse_class = ff_inverse[vr->classifications];
1360  for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1361  if (!do_not_decode[j]) {
1362  unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1363  vc->codebooks[vr->classbook].nb_bits, 3);
1364 
1365  av_dlog(NULL, "Classword: %u\n", temp);
1366 
1367  av_assert0(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1368  for (i = 0; i < c_p_c; ++i) {
1369  unsigned temp2;
1370 
1371  temp2 = (((uint64_t)temp) * inverse_class) >> 32;
1372  if (partition_count + c_p_c - 1 - i < ptns_to_read)
1373  classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1374  temp = temp2;
1375  }
1376  }
1377  j_times_ptns_to_read += ptns_to_read;
1378  }
1379  }
1380  for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1381  for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1382  unsigned voffs;
1383 
1384  if (!do_not_decode[j]) {
1385  unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
1386  int vqbook = vr->books[vqclass][pass];
1387 
1388  if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1389  unsigned coffs;
1390  unsigned dim = vc->codebooks[vqbook].dimensions;
1391  unsigned step = FASTDIV(vr->partition_size << 1, dim << 1);
1392  vorbis_codebook codebook = vc->codebooks[vqbook];
1393 
1394  if (vr_type == 0) {
1395 
1396  voffs = voffset+j*vlen;
1397  for (k = 0; k < step; ++k) {
1398  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1399  for (l = 0; l < dim; ++l)
1400  vec[voffs + k + l * step] += codebook.codevectors[coffs + l];
1401  }
1402  } else if (vr_type == 1) {
1403  voffs = voffset + j * vlen;
1404  for (k = 0; k < step; ++k) {
1405  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1406  for (l = 0; l < dim; ++l, ++voffs) {
1407  vec[voffs]+=codebook.codevectors[coffs+l];
1408 
1409  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d \n",
1410  pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1411  }
1412  }
1413  } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1414  voffs = voffset >> 1;
1415 
1416  if (dim == 2) {
1417  for (k = 0; k < step; ++k) {
1418  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1419  vec[voffs + k ] += codebook.codevectors[coffs ];
1420  vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];
1421  }
1422  } else if (dim == 4) {
1423  for (k = 0; k < step; ++k, voffs += 2) {
1424  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1425  vec[voffs ] += codebook.codevectors[coffs ];
1426  vec[voffs + 1 ] += codebook.codevectors[coffs + 2];
1427  vec[voffs + vlen ] += codebook.codevectors[coffs + 1];
1428  vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];
1429  }
1430  } else
1431  for (k = 0; k < step; ++k) {
1432  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1433  for (l = 0; l < dim; l += 2, voffs++) {
1434  vec[voffs ] += codebook.codevectors[coffs + l ];
1435  vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];
1436 
1437  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1438  pass, voffset / ch + (voffs % ch) * vlen,
1439  vec[voffset / ch + (voffs % ch) * vlen],
1440  codebook.codevectors[coffs + l], coffs, l);
1441  }
1442  }
1443 
1444  } else if (vr_type == 2) {
1445  unsigned voffs_div = FASTDIV(voffset << 1, ch <<1);
1446  unsigned voffs_mod = voffset - voffs_div * ch;
1447 
1448  for (k = 0; k < step; ++k) {
1449  coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1450  for (l = 0; l < dim; ++l) {
1451  vec[voffs_div + voffs_mod * vlen] +=
1452  codebook.codevectors[coffs + l];
1453 
1454  av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n",
1455  pass, voffs_div + voffs_mod * vlen,
1456  vec[voffs_div + voffs_mod * vlen],
1457  codebook.codevectors[coffs + l], coffs, l);
1458 
1459  if (++voffs_mod == ch) {
1460  voffs_div++;
1461  voffs_mod = 0;
1462  }
1463  }
1464  }
1465  }
1466  }
1467  }
1468  j_times_ptns_to_read += ptns_to_read;
1469  }
1470  ++partition_count;
1471  voffset += vr->partition_size;
1472  }
1473  }
1474  }
1475  return 0;
1476 }
1477 
1478 static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1479  unsigned ch,
1480  uint8_t *do_not_decode,
1481  float *vec, unsigned vlen,
1482  unsigned ch_left)
1483 {
1484  if (vr->type == 2)
1485  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
1486  else if (vr->type == 1)
1487  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
1488  else if (vr->type == 0)
1489  return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
1490  else {
1491  av_log(vc->avctx, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1492  return AVERROR_INVALIDDATA;
1493  }
1494 }
1495 
1496 void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t blocksize)
1497 {
1498  int i;
1499  for (i = 0; i < blocksize; i++) {
1500  if (mag[i] > 0.0) {
1501  if (ang[i] > 0.0) {
1502  ang[i] = mag[i] - ang[i];
1503  } else {
1504  float temp = ang[i];
1505  ang[i] = mag[i];
1506  mag[i] += temp;
1507  }
1508  } else {
1509  if (ang[i] > 0.0) {
1510  ang[i] += mag[i];
1511  } else {
1512  float temp = ang[i];
1513  ang[i] = mag[i];
1514  mag[i] -= temp;
1515  }
1516  }
1517  }
1518 }
1519 
1520 // Decode the audio packet using the functions above
1521 
1522 static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr)
1523 {
1524  GetBitContext *gb = &vc->gb;
1525  FFTContext *mdct;
1526  unsigned previous_window = vc->previous_window;
1527  unsigned mode_number, blockflag, blocksize;
1528  int i, j;
1529  uint8_t no_residue[255];
1530  uint8_t do_not_decode[255];
1531  vorbis_mapping *mapping;
1532  float *ch_res_ptr = vc->channel_residues;
1533  uint8_t res_chan[255];
1534  unsigned res_num = 0;
1535  int retlen = 0;
1536  unsigned ch_left = vc->audio_channels;
1537  unsigned vlen;
1538 
1539  if (get_bits1(gb)) {
1540  av_log(vc->avctx, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1541  return AVERROR_INVALIDDATA; // packet type not audio
1542  }
1543 
1544  if (vc->mode_count == 1) {
1545  mode_number = 0;
1546  } else {
1547  GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1548  }
1549  vc->mode_number = mode_number;
1550  mapping = &vc->mappings[vc->modes[mode_number].mapping];
1551 
1552  av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
1553  vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1554 
1555  blockflag = vc->modes[mode_number].blockflag;
1556  blocksize = vc->blocksize[blockflag];
1557  vlen = blocksize / 2;
1558  if (blockflag) {
1559  previous_window = get_bits(gb, 1);
1560  skip_bits1(gb); // next_window
1561  }
1562 
1563  memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
1564  for (i = 0; i < vc->audio_channels; ++i)
1565  memset(floor_ptr[i], 0, vlen * sizeof(floor_ptr[0][0])); //FIXME can this be removed ?
1566 
1567 // Decode floor
1568 
1569  for (i = 0; i < vc->audio_channels; ++i) {
1570  vorbis_floor *floor;
1571  int ret;
1572  if (mapping->submaps > 1) {
1573  floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1574  } else {
1575  floor = &vc->floors[mapping->submap_floor[0]];
1576  }
1577 
1578  ret = floor->decode(vc, &floor->data, floor_ptr[i]);
1579 
1580  if (ret < 0) {
1581  av_log(vc->avctx, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
1582  return AVERROR_INVALIDDATA;
1583  }
1584  no_residue[i] = ret;
1585  }
1586 
1587 // Nonzero vector propagate
1588 
1589  for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1590  if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1591  no_residue[mapping->magnitude[i]] = 0;
1592  no_residue[mapping->angle[i]] = 0;
1593  }
1594  }
1595 
1596 // Decode residue
1597 
1598  for (i = 0; i < mapping->submaps; ++i) {
1599  vorbis_residue *residue;
1600  unsigned ch = 0;
1601  int ret;
1602 
1603  for (j = 0; j < vc->audio_channels; ++j) {
1604  if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1605  res_chan[j] = res_num;
1606  if (no_residue[j]) {
1607  do_not_decode[ch] = 1;
1608  } else {
1609  do_not_decode[ch] = 0;
1610  }
1611  ++ch;
1612  ++res_num;
1613  }
1614  }
1615  residue = &vc->residues[mapping->submap_residue[i]];
1616  if (ch_left < ch) {
1617  av_log(vc->avctx, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
1618  return -1;
1619  }
1620  if (ch) {
1621  ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
1622  if (ret < 0)
1623  return ret;
1624  }
1625 
1626  ch_res_ptr += ch * vlen;
1627  ch_left -= ch;
1628  }
1629 
1630  if (ch_left > 0)
1631  return AVERROR_INVALIDDATA;
1632 
1633 // Inverse coupling
1634 
1635  for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1636  float *mag, *ang;
1637 
1638  mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1639  ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1640  vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1641  }
1642 
1643 // Dotproduct, MDCT
1644 
1645  mdct = &vc->mdct[blockflag];
1646 
1647  for (j = vc->audio_channels-1;j >= 0; j--) {
1648  ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
1649  vc->fdsp.vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);
1650  mdct->imdct_half(mdct, ch_res_ptr, floor_ptr[j]);
1651  }
1652 
1653 // Overlap/add, save data for next overlapping
1654 
1655  retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1656  for (j = 0; j < vc->audio_channels; j++) {
1657  unsigned bs0 = vc->blocksize[0];
1658  unsigned bs1 = vc->blocksize[1];
1659  float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1660  float *saved = vc->saved + j * bs1 / 4;
1661  float *ret = floor_ptr[j];
1662  float *buf = residue;
1663  const float *win = vc->win[blockflag & previous_window];
1664 
1665  if (blockflag == previous_window) {
1666  vc->fdsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
1667  } else if (blockflag > previous_window) {
1668  vc->fdsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
1669  memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
1670  } else {
1671  memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
1672  vc->fdsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
1673  }
1674  memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1675  }
1676 
1677  vc->previous_window = blockflag;
1678  return retlen;
1679 }
1680 
1681 // Return the decoded audio packet through the standard api
1682 
1683 static int vorbis_decode_frame(AVCodecContext *avctx, void *data,
1684  int *got_frame_ptr, AVPacket *avpkt)
1685 {
1686  const uint8_t *buf = avpkt->data;
1687  int buf_size = avpkt->size;
1688  vorbis_context *vc = avctx->priv_data;
1689  AVFrame *frame = data;
1690  GetBitContext *gb = &vc->gb;
1691  float *channel_ptrs[255];
1692  int i, len, ret;
1693 
1694  av_dlog(NULL, "packet length %d \n", buf_size);
1695 
1696  if (*buf == 1 && buf_size > 7) {
1697  init_get_bits(gb, buf+1, buf_size*8 - 8);
1698  vorbis_free(vc);
1699  if ((ret = vorbis_parse_id_hdr(vc))) {
1700  av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");
1701  vorbis_free(vc);
1702  return ret;
1703  }
1704 
1705  if (vc->audio_channels > 8)
1706  avctx->channel_layout = 0;
1707  else
1708  avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1709 
1710  avctx->channels = vc->audio_channels;
1711  avctx->sample_rate = vc->audio_samplerate;
1712  return buf_size;
1713  }
1714 
1715  if (*buf == 3 && buf_size > 7) {
1716  av_log(avctx, AV_LOG_DEBUG, "Ignoring comment header\n");
1717  return buf_size;
1718  }
1719 
1720  if (*buf == 5 && buf_size > 7 && vc->channel_residues && !vc->modes) {
1721  init_get_bits(gb, buf+1, buf_size*8 - 8);
1722  if ((ret = vorbis_parse_setup_hdr(vc))) {
1723  av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");
1724  vorbis_free(vc);
1725  return ret;
1726  }
1727  return buf_size;
1728  }
1729 
1730  if (!vc->channel_residues || !vc->modes) {
1731  av_log(avctx, AV_LOG_ERROR, "Data packet before valid headers\n");
1732  return AVERROR_INVALIDDATA;
1733  }
1734 
1735  /* get output buffer */
1736  frame->nb_samples = vc->blocksize[1] / 2;
1737  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
1738  return ret;
1739 
1740  if (vc->audio_channels > 8) {
1741  for (i = 0; i < vc->audio_channels; i++)
1742  channel_ptrs[i] = (float *)frame->extended_data[i];
1743  } else {
1744  for (i = 0; i < vc->audio_channels; i++) {
1745  int ch = ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1746  channel_ptrs[ch] = (float *)frame->extended_data[i];
1747  }
1748  }
1749 
1750  init_get_bits(gb, buf, buf_size*8);
1751 
1752  if ((len = vorbis_parse_audio_packet(vc, channel_ptrs)) <= 0)
1753  return len;
1754 
1755  if (!vc->first_frame) {
1756  vc->first_frame = 1;
1757  *got_frame_ptr = 0;
1758  av_frame_unref(frame);
1759  return buf_size;
1760  }
1761 
1762  av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
1763  get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
1764 
1765  frame->nb_samples = len;
1766  *got_frame_ptr = 1;
1767 
1768  return buf_size;
1769 }
1770 
1771 // Close decoder
1772 
1773 static av_cold int vorbis_decode_close(AVCodecContext *avctx)
1774 {
1775  vorbis_context *vc = avctx->priv_data;
1776 
1777  vorbis_free(vc);
1778 
1779  return 0;
1780 }
1781 
1782 static av_cold void vorbis_decode_flush(AVCodecContext *avctx)
1783 {
1784  vorbis_context *vc = avctx->priv_data;
1785 
1786  if (vc->saved) {
1787  memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *
1788  sizeof(*vc->saved));
1789  }
1790  vc->previous_window = 0;
1791 }
1792 
1793 AVCodec ff_vorbis_decoder = {
1794  .name = "vorbis",
1795  .type = AVMEDIA_TYPE_AUDIO,
1796  .id = AV_CODEC_ID_VORBIS,
1797  .priv_data_size = sizeof(vorbis_context),
1798  .init = vorbis_decode_init,
1799  .close = vorbis_decode_close,
1800  .decode = vorbis_decode_frame,
1801  .flush = vorbis_decode_flush,
1802  .capabilities = CODEC_CAP_DR1,
1803  .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1804  .channel_layouts = ff_vorbis_channel_layouts,
1805  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
1806  AV_SAMPLE_FMT_NONE },
1807 };
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