vorbisdec: remove variable-length arrays
[libav.git] / libavcodec / vorbis_dec.c
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 #undef V_DEBUG
24 //#define V_DEBUG
25 //#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)
26
27 #include <math.h>
28
29 #define ALT_BITSTREAM_READER_LE
30 #include "avcodec.h"
31 #include "get_bits.h"
32 #include "dsputil.h"
33 #include "fft.h"
34
35 #include "vorbis.h"
36 #include "xiph.h"
37
38 #define V_NB_BITS 8
39 #define V_NB_BITS2 11
40 #define V_MAX_VLCS (1 << 16)
41 #define V_MAX_PARTITIONS (1 << 20)
42
43 #ifndef V_DEBUG
44 #define AV_DEBUG(...)
45 #endif
46
47 #undef NDEBUG
48 #include <assert.h>
49
50 typedef struct {
51 uint_fast8_t dimensions;
52 uint_fast8_t lookup_type;
53 uint_fast8_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 uint_fast8_t (* vorbis_floor_decode_func)
65 (struct vorbis_context_s *, vorbis_floor_data *, float *);
66 typedef struct {
67 uint_fast8_t floor_type;
68 vorbis_floor_decode_func decode;
69 union vorbis_floor_u {
70 struct vorbis_floor0_s {
71 uint_fast8_t order;
72 uint_fast16_t rate;
73 uint_fast16_t bark_map_size;
74 int_fast32_t *map[2];
75 uint_fast32_t map_size[2];
76 uint_fast8_t amplitude_bits;
77 uint_fast8_t amplitude_offset;
78 uint_fast8_t num_books;
79 uint_fast8_t *book_list;
80 float *lsp;
81 } t0;
82 struct vorbis_floor1_s {
83 uint_fast8_t partitions;
84 uint_fast8_t partition_class[32];
85 uint_fast8_t class_dimensions[16];
86 uint_fast8_t class_subclasses[16];
87 uint_fast8_t class_masterbook[16];
88 int_fast16_t subclass_books[16][8];
89 uint_fast8_t multiplier;
90 uint_fast16_t x_list_dim;
91 vorbis_floor1_entry *list;
92 } t1;
93 } data;
94 } vorbis_floor;
95
96 typedef struct {
97 uint_fast16_t type;
98 uint_fast32_t begin;
99 uint_fast32_t end;
100 uint_fast32_t partition_size;
101 uint_fast8_t classifications;
102 uint_fast8_t classbook;
103 int_fast16_t books[64][8];
104 uint_fast8_t maxpass;
105 uint_fast16_t ptns_to_read;
106 uint_fast8_t *classifs;
107 } vorbis_residue;
108
109 typedef struct {
110 uint_fast8_t submaps;
111 uint_fast16_t coupling_steps;
112 uint_fast8_t *magnitude;
113 uint_fast8_t *angle;
114 uint_fast8_t *mux;
115 uint_fast8_t submap_floor[16];
116 uint_fast8_t submap_residue[16];
117 } vorbis_mapping;
118
119 typedef struct {
120 uint_fast8_t blockflag;
121 uint_fast16_t windowtype;
122 uint_fast16_t transformtype;
123 uint_fast8_t mapping;
124 } vorbis_mode;
125
126 typedef struct vorbis_context_s {
127 AVCodecContext *avccontext;
128 GetBitContext gb;
129 DSPContext dsp;
130
131 FFTContext mdct[2];
132 uint_fast8_t first_frame;
133 uint_fast32_t version;
134 uint_fast8_t audio_channels;
135 uint_fast32_t audio_samplerate;
136 uint_fast32_t bitrate_maximum;
137 uint_fast32_t bitrate_nominal;
138 uint_fast32_t bitrate_minimum;
139 uint_fast32_t blocksize[2];
140 const float *win[2];
141 uint_fast16_t codebook_count;
142 vorbis_codebook *codebooks;
143 uint_fast8_t floor_count;
144 vorbis_floor *floors;
145 uint_fast8_t residue_count;
146 vorbis_residue *residues;
147 uint_fast8_t mapping_count;
148 vorbis_mapping *mappings;
149 uint_fast8_t mode_count;
150 vorbis_mode *modes;
151 uint_fast8_t mode_number; // mode number for the current packet
152 uint_fast8_t previous_window;
153 float *channel_residues;
154 float *channel_floors;
155 float *saved;
156 uint_fast32_t add_bias; // for float->int conversion
157 uint_fast32_t exp_bias;
158 } vorbis_context;
159
160 /* Helper functions */
161
162 #define BARK(x) \
163 (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
164
165 static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
166 #define VALIDATE_INDEX(idx, limit) \
167 if (idx >= limit) {\
168 av_log(vc->avccontext, AV_LOG_ERROR,\
169 idx_err_str,\
170 (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
171 return -1;\
172 }
173 #define GET_VALIDATED_INDEX(idx, bits, limit) \
174 {\
175 idx = get_bits(gb, bits);\
176 VALIDATE_INDEX(idx, limit)\
177 }
178
179 static float vorbisfloat2float(uint_fast32_t val)
180 {
181 double mant = val & 0x1fffff;
182 long exp = (val & 0x7fe00000L) >> 21;
183 if (val & 0x80000000)
184 mant = -mant;
185 return ldexp(mant, exp - 20 - 768);
186 }
187
188
189 // Free all allocated memory -----------------------------------------
190
191 static void vorbis_free(vorbis_context *vc)
192 {
193 int_fast16_t i;
194
195 av_freep(&vc->channel_residues);
196 av_freep(&vc->channel_floors);
197 av_freep(&vc->saved);
198
199 for (i = 0; i < vc->residue_count; i++)
200 av_free(vc->residues[i].classifs);
201 av_freep(&vc->residues);
202 av_freep(&vc->modes);
203
204 ff_mdct_end(&vc->mdct[0]);
205 ff_mdct_end(&vc->mdct[1]);
206
207 for (i = 0; i < vc->codebook_count; ++i) {
208 av_free(vc->codebooks[i].codevectors);
209 free_vlc(&vc->codebooks[i].vlc);
210 }
211 av_freep(&vc->codebooks);
212
213 for (i = 0; i < vc->floor_count; ++i) {
214 if (vc->floors[i].floor_type == 0) {
215 av_free(vc->floors[i].data.t0.map[0]);
216 av_free(vc->floors[i].data.t0.map[1]);
217 av_free(vc->floors[i].data.t0.book_list);
218 av_free(vc->floors[i].data.t0.lsp);
219 } else {
220 av_free(vc->floors[i].data.t1.list);
221 }
222 }
223 av_freep(&vc->floors);
224
225 for (i = 0; i < vc->mapping_count; ++i) {
226 av_free(vc->mappings[i].magnitude);
227 av_free(vc->mappings[i].angle);
228 av_free(vc->mappings[i].mux);
229 }
230 av_freep(&vc->mappings);
231 }
232
233 // Parse setup header -------------------------------------------------
234
235 // Process codebooks part
236
237 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
238 {
239 uint_fast16_t cb;
240 uint8_t *tmp_vlc_bits;
241 uint32_t *tmp_vlc_codes;
242 GetBitContext *gb = &vc->gb;
243 uint_fast16_t *codebook_multiplicands;
244
245 vc->codebook_count = get_bits(gb, 8) + 1;
246
247 AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
248
249 vc->codebooks = av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
250 tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
251 tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
252 codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
253
254 for (cb = 0; cb < vc->codebook_count; ++cb) {
255 vorbis_codebook *codebook_setup = &vc->codebooks[cb];
256 uint_fast8_t ordered;
257 uint_fast32_t t, used_entries = 0;
258 uint_fast32_t entries;
259
260 AV_DEBUG(" %d. Codebook \n", cb);
261
262 if (get_bits(gb, 24) != 0x564342) {
263 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
264 goto error;
265 }
266
267 codebook_setup->dimensions=get_bits(gb, 16);
268 if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
269 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions);
270 goto error;
271 }
272 entries = get_bits(gb, 24);
273 if (entries > V_MAX_VLCS) {
274 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
275 goto error;
276 }
277
278 ordered = get_bits1(gb);
279
280 AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
281
282 if (!ordered) {
283 uint_fast16_t ce;
284 uint_fast8_t flag;
285 uint_fast8_t sparse = get_bits1(gb);
286
287 AV_DEBUG(" not ordered \n");
288
289 if (sparse) {
290 AV_DEBUG(" sparse \n");
291
292 used_entries = 0;
293 for (ce = 0; ce < entries; ++ce) {
294 flag = get_bits1(gb);
295 if (flag) {
296 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
297 ++used_entries;
298 } else
299 tmp_vlc_bits[ce] = 0;
300 }
301 } else {
302 AV_DEBUG(" not sparse \n");
303
304 used_entries = entries;
305 for (ce = 0; ce < entries; ++ce)
306 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
307 }
308 } else {
309 uint_fast16_t current_entry = 0;
310 uint_fast8_t current_length = get_bits(gb, 5)+1;
311
312 AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME
313
314 used_entries = entries;
315 for (; current_entry < used_entries && current_length <= 32; ++current_length) {
316 uint_fast16_t i, number;
317
318 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
319
320 number = get_bits(gb, ilog(entries - current_entry));
321
322 AV_DEBUG(" number: %d \n", number);
323
324 for (i = current_entry; i < number+current_entry; ++i)
325 if (i < used_entries)
326 tmp_vlc_bits[i] = current_length;
327
328 current_entry+=number;
329 }
330 if (current_entry>used_entries) {
331 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
332 goto error;
333 }
334 }
335
336 codebook_setup->lookup_type = get_bits(gb, 4);
337
338 AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup");
339
340 // If the codebook is used for (inverse) VQ, calculate codevectors.
341
342 if (codebook_setup->lookup_type == 1) {
343 uint_fast16_t i, j, k;
344 uint_fast16_t codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
345
346 float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
347 float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
348 uint_fast8_t codebook_value_bits = get_bits(gb, 4)+1;
349 uint_fast8_t codebook_sequence_p = get_bits1(gb);
350
351 AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
352 AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
353
354 for (i = 0; i < codebook_lookup_values; ++i) {
355 codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
356
357 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
358 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
359 }
360
361 // Weed out unused vlcs and build codevector vector
362 codebook_setup->codevectors = used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
363 for (j = 0, i = 0; i < entries; ++i) {
364 uint_fast8_t dim = codebook_setup->dimensions;
365
366 if (tmp_vlc_bits[i]) {
367 float last = 0.0;
368 uint_fast32_t lookup_offset = i;
369
370 #ifdef V_DEBUG
371 av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
372 #endif
373
374 for (k = 0; k < dim; ++k) {
375 uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
376 codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
377 if (codebook_sequence_p)
378 last = codebook_setup->codevectors[j * dim + k];
379 lookup_offset/=codebook_lookup_values;
380 }
381 tmp_vlc_bits[j] = tmp_vlc_bits[i];
382
383 #ifdef V_DEBUG
384 av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
385 for (k = 0; k < dim; ++k)
386 av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j * dim + k]);
387 av_log(vc->avccontext, AV_LOG_INFO, "\n");
388 #endif
389
390 ++j;
391 }
392 }
393 if (j != used_entries) {
394 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
395 goto error;
396 }
397 entries = used_entries;
398 } else if (codebook_setup->lookup_type >= 2) {
399 av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
400 goto error;
401 }
402
403 // Initialize VLC table
404 if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
405 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
406 goto error;
407 }
408 codebook_setup->maxdepth = 0;
409 for (t = 0; t < entries; ++t)
410 if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
411 codebook_setup->maxdepth = tmp_vlc_bits[t];
412
413 if (codebook_setup->maxdepth > 3 * V_NB_BITS)
414 codebook_setup->nb_bits = V_NB_BITS2;
415 else
416 codebook_setup->nb_bits = V_NB_BITS;
417
418 codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
419
420 if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {
421 av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
422 goto error;
423 }
424 }
425
426 av_free(tmp_vlc_bits);
427 av_free(tmp_vlc_codes);
428 av_free(codebook_multiplicands);
429 return 0;
430
431 // Error:
432 error:
433 av_free(tmp_vlc_bits);
434 av_free(tmp_vlc_codes);
435 av_free(codebook_multiplicands);
436 return -1;
437 }
438
439 // Process time domain transforms part (unused in Vorbis I)
440
441 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
442 {
443 GetBitContext *gb = &vc->gb;
444 uint_fast8_t i;
445 uint_fast8_t vorbis_time_count = get_bits(gb, 6) + 1;
446
447 for (i = 0; i < vorbis_time_count; ++i) {
448 uint_fast16_t vorbis_tdtransform = get_bits(gb, 16);
449
450 AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
451
452 if (vorbis_tdtransform) {
453 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
454 return -1;
455 }
456 }
457 return 0;
458 }
459
460 // Process floors part
461
462 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
463 vorbis_floor_data *vfu, float *vec);
464 static void create_map(vorbis_context *vc, uint_fast8_t floor_number);
465 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
466 vorbis_floor_data *vfu, float *vec);
467 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
468 {
469 GetBitContext *gb = &vc->gb;
470 uint_fast16_t i,j,k;
471
472 vc->floor_count = get_bits(gb, 6) + 1;
473
474 vc->floors = av_mallocz(vc->floor_count * sizeof(vorbis_floor));
475
476 for (i = 0; i < vc->floor_count; ++i) {
477 vorbis_floor *floor_setup = &vc->floors[i];
478
479 floor_setup->floor_type = get_bits(gb, 16);
480
481 AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
482
483 if (floor_setup->floor_type == 1) {
484 int maximum_class = -1;
485 uint_fast8_t rangebits;
486 uint_fast16_t floor1_values = 2;
487
488 floor_setup->decode = vorbis_floor1_decode;
489
490 floor_setup->data.t1.partitions = get_bits(gb, 5);
491
492 AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
493
494 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
495 floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
496 if (floor_setup->data.t1.partition_class[j] > maximum_class)
497 maximum_class = floor_setup->data.t1.partition_class[j];
498
499 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
500
501 }
502
503 AV_DEBUG(" maximum class %d \n", maximum_class);
504
505 for (j = 0; j <= maximum_class; ++j) {
506 floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
507 floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
508
509 AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->data.t1.class_dimensions[j], floor_setup->data.t1.class_subclasses[j]);
510
511 if (floor_setup->data.t1.class_subclasses[j]) {
512 GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
513
514 AV_DEBUG(" masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
515 }
516
517 for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
518 int16_t bits = get_bits(gb, 8) - 1;
519 if (bits != -1)
520 VALIDATE_INDEX(bits, vc->codebook_count)
521 floor_setup->data.t1.subclass_books[j][k] = bits;
522
523 AV_DEBUG(" book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
524 }
525 }
526
527 floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
528 floor_setup->data.t1.x_list_dim = 2;
529
530 for (j = 0; j < floor_setup->data.t1.partitions; ++j)
531 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
532
533 floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
534
535
536 rangebits = get_bits(gb, 4);
537 floor_setup->data.t1.list[0].x = 0;
538 floor_setup->data.t1.list[1].x = (1 << rangebits);
539
540 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
541 for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
542 floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
543
544 AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
545 }
546 }
547
548 // Precalculate order of x coordinates - needed for decode
549 ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
550 } else if (floor_setup->floor_type == 0) {
551 uint_fast8_t max_codebook_dim = 0;
552
553 floor_setup->decode = vorbis_floor0_decode;
554
555 floor_setup->data.t0.order = get_bits(gb, 8);
556 floor_setup->data.t0.rate = get_bits(gb, 16);
557 floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
558 floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
559 /* zero would result in a div by zero later *
560 * 2^0 - 1 == 0 */
561 if (floor_setup->data.t0.amplitude_bits == 0) {
562 av_log(vc->avccontext, AV_LOG_ERROR,
563 "Floor 0 amplitude bits is 0.\n");
564 return -1;
565 }
566 floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
567 floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
568
569 /* allocate mem for booklist */
570 floor_setup->data.t0.book_list =
571 av_malloc(floor_setup->data.t0.num_books);
572 if (!floor_setup->data.t0.book_list)
573 return -1;
574 /* read book indexes */
575 {
576 int idx;
577 uint_fast8_t book_idx;
578 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
579 GET_VALIDATED_INDEX(floor_setup->data.t0.book_list[idx], 8, vc->codebook_count)
580 if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
581 max_codebook_dim = vc->codebooks[book_idx].dimensions;
582 }
583 }
584
585 create_map(vc, i);
586
587 /* allocate mem for lsp coefficients */
588 {
589 /* codebook dim is for padding if codebook dim doesn't *
590 * divide order+1 then we need to read more data */
591 floor_setup->data.t0.lsp =
592 av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
593 * sizeof(float));
594 if (!floor_setup->data.t0.lsp)
595 return -1;
596 }
597
598 #ifdef V_DEBUG /* debug output parsed headers */
599 AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
600 AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
601 AV_DEBUG("floor0 bark map size: %u\n",
602 floor_setup->data.t0.bark_map_size);
603 AV_DEBUG("floor0 amplitude bits: %u\n",
604 floor_setup->data.t0.amplitude_bits);
605 AV_DEBUG("floor0 amplitude offset: %u\n",
606 floor_setup->data.t0.amplitude_offset);
607 AV_DEBUG("floor0 number of books: %u\n",
608 floor_setup->data.t0.num_books);
609 AV_DEBUG("floor0 book list pointer: %p\n",
610 floor_setup->data.t0.book_list);
611 {
612 int idx;
613 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
614 AV_DEBUG(" Book %d: %u\n",
615 idx+1,
616 floor_setup->data.t0.book_list[idx]);
617 }
618 }
619 #endif
620 } else {
621 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
622 return -1;
623 }
624 }
625 return 0;
626 }
627
628 // Process residues part
629
630 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
631 {
632 GetBitContext *gb = &vc->gb;
633 uint_fast8_t i, j, k;
634
635 vc->residue_count = get_bits(gb, 6)+1;
636 vc->residues = av_mallocz(vc->residue_count * sizeof(vorbis_residue));
637
638 AV_DEBUG(" There are %d residues. \n", vc->residue_count);
639
640 for (i = 0; i < vc->residue_count; ++i) {
641 vorbis_residue *res_setup = &vc->residues[i];
642 uint_fast8_t cascade[64];
643 uint_fast8_t high_bits;
644 uint_fast8_t low_bits;
645
646 res_setup->type = get_bits(gb, 16);
647
648 AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
649
650 res_setup->begin = get_bits(gb, 24);
651 res_setup->end = get_bits(gb, 24);
652 res_setup->partition_size = get_bits(gb, 24) + 1;
653 /* Validations to prevent a buffer overflow later. */
654 if (res_setup->begin>res_setup->end ||
655 res_setup->end > vc->avccontext->channels * vc->blocksize[1] / (res_setup->type == 2 ? 1 : 2) ||
656 (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
657 av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %"PRIdFAST16", %"PRIdFAST32", %"PRIdFAST32", %"PRIdFAST32", %"PRIdFAST32"\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1] / 2);
658 return -1;
659 }
660
661 res_setup->classifications = get_bits(gb, 6) + 1;
662 GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
663
664 res_setup->ptns_to_read =
665 (res_setup->end - res_setup->begin) / res_setup->partition_size;
666 res_setup->classifs = av_malloc(res_setup->ptns_to_read *
667 vc->audio_channels *
668 sizeof(*res_setup->classifs));
669
670 AV_DEBUG(" begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size,
671 res_setup->classifications, res_setup->classbook);
672
673 for (j = 0; j < res_setup->classifications; ++j) {
674 high_bits = 0;
675 low_bits = get_bits(gb, 3);
676 if (get_bits1(gb))
677 high_bits = get_bits(gb, 5);
678 cascade[j] = (high_bits << 3) + low_bits;
679
680 AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j]));
681 }
682
683 res_setup->maxpass = 0;
684 for (j = 0; j < res_setup->classifications; ++j) {
685 for (k = 0; k < 8; ++k) {
686 if (cascade[j]&(1 << k)) {
687 GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
688
689 AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
690
691 if (k>res_setup->maxpass)
692 res_setup->maxpass = k;
693 } else {
694 res_setup->books[j][k] = -1;
695 }
696 }
697 }
698 }
699 return 0;
700 }
701
702 // Process mappings part
703
704 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
705 {
706 GetBitContext *gb = &vc->gb;
707 uint_fast8_t i, j;
708
709 vc->mapping_count = get_bits(gb, 6)+1;
710 vc->mappings = av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
711
712 AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
713
714 for (i = 0; i < vc->mapping_count; ++i) {
715 vorbis_mapping *mapping_setup = &vc->mappings[i];
716
717 if (get_bits(gb, 16)) {
718 av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
719 return -1;
720 }
721 if (get_bits1(gb)) {
722 mapping_setup->submaps = get_bits(gb, 4) + 1;
723 } else {
724 mapping_setup->submaps = 1;
725 }
726
727 if (get_bits1(gb)) {
728 mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
729 mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
730 mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
731 for (j = 0; j < mapping_setup->coupling_steps; ++j) {
732 GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
733 GET_VALIDATED_INDEX(mapping_setup->angle[j], ilog(vc->audio_channels - 1), vc->audio_channels)
734 }
735 } else {
736 mapping_setup->coupling_steps = 0;
737 }
738
739 AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
740
741 if (get_bits(gb, 2)) {
742 av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
743 return -1; // following spec.
744 }
745
746 if (mapping_setup->submaps>1) {
747 mapping_setup->mux = av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
748 for (j = 0; j < vc->audio_channels; ++j)
749 mapping_setup->mux[j] = get_bits(gb, 4);
750 }
751
752 for (j = 0; j < mapping_setup->submaps; ++j) {
753 skip_bits(gb, 8); // FIXME check?
754 GET_VALIDATED_INDEX(mapping_setup->submap_floor[j], 8, vc->floor_count)
755 GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
756
757 AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
758 }
759 }
760 return 0;
761 }
762
763 // Process modes part
764
765 static void create_map(vorbis_context *vc, uint_fast8_t floor_number)
766 {
767 vorbis_floor *floors = vc->floors;
768 vorbis_floor0 *vf;
769 int idx;
770 int_fast8_t blockflag;
771 int_fast32_t *map;
772 int_fast32_t n; //TODO: could theoretically be smaller?
773
774 for (blockflag = 0; blockflag < 2; ++blockflag) {
775 n = vc->blocksize[blockflag] / 2;
776 floors[floor_number].data.t0.map[blockflag] =
777 av_malloc((n+1) * sizeof(int_fast32_t)); // n + sentinel
778
779 map = floors[floor_number].data.t0.map[blockflag];
780 vf = &floors[floor_number].data.t0;
781
782 for (idx = 0; idx < n; ++idx) {
783 map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
784 ((vf->bark_map_size) /
785 BARK(vf->rate / 2.0f)));
786 if (vf->bark_map_size-1 < map[idx])
787 map[idx] = vf->bark_map_size - 1;
788 }
789 map[n] = -1;
790 vf->map_size[blockflag] = n;
791 }
792
793 # ifdef V_DEBUG
794 for (idx = 0; idx <= n; ++idx) {
795 AV_DEBUG("floor0 map: map at pos %d is %d\n",
796 idx, map[idx]);
797 }
798 # endif
799 }
800
801 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
802 {
803 GetBitContext *gb = &vc->gb;
804 uint_fast8_t i;
805
806 vc->mode_count = get_bits(gb, 6) + 1;
807 vc->modes = av_mallocz(vc->mode_count * sizeof(vorbis_mode));
808
809 AV_DEBUG(" There are %d modes.\n", vc->mode_count);
810
811 for (i = 0; i < vc->mode_count; ++i) {
812 vorbis_mode *mode_setup = &vc->modes[i];
813
814 mode_setup->blockflag = get_bits1(gb);
815 mode_setup->windowtype = get_bits(gb, 16); //FIXME check
816 mode_setup->transformtype = get_bits(gb, 16); //FIXME check
817 GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
818
819 AV_DEBUG(" %d mode: blockflag %d, windowtype %d, transformtype %d, mapping %d \n", i, mode_setup->blockflag, mode_setup->windowtype, mode_setup->transformtype, mode_setup->mapping);
820 }
821 return 0;
822 }
823
824 // Process the whole setup header using the functions above
825
826 static int vorbis_parse_setup_hdr(vorbis_context *vc)
827 {
828 GetBitContext *gb = &vc->gb;
829
830 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
831 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
832 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
833 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
834 return -1;
835 }
836
837 if (vorbis_parse_setup_hdr_codebooks(vc)) {
838 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
839 return -2;
840 }
841 if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
842 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
843 return -3;
844 }
845 if (vorbis_parse_setup_hdr_floors(vc)) {
846 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
847 return -4;
848 }
849 if (vorbis_parse_setup_hdr_residues(vc)) {
850 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
851 return -5;
852 }
853 if (vorbis_parse_setup_hdr_mappings(vc)) {
854 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
855 return -6;
856 }
857 if (vorbis_parse_setup_hdr_modes(vc)) {
858 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
859 return -7;
860 }
861 if (!get_bits1(gb)) {
862 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
863 return -8; // framing flag bit unset error
864 }
865
866 return 0;
867 }
868
869 // Process the identification header
870
871 static int vorbis_parse_id_hdr(vorbis_context *vc)
872 {
873 GetBitContext *gb = &vc->gb;
874 uint_fast8_t bl0, bl1;
875
876 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
877 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
878 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
879 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
880 return -1;
881 }
882
883 vc->version = get_bits_long(gb, 32); //FIXME check 0
884 vc->audio_channels = get_bits(gb, 8);
885 if (vc->audio_channels <= 0) {
886 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
887 return -1;
888 }
889 vc->audio_samplerate = get_bits_long(gb, 32);
890 if (vc->audio_samplerate <= 0) {
891 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
892 return -1;
893 }
894 vc->bitrate_maximum = get_bits_long(gb, 32);
895 vc->bitrate_nominal = get_bits_long(gb, 32);
896 vc->bitrate_minimum = get_bits_long(gb, 32);
897 bl0 = get_bits(gb, 4);
898 bl1 = get_bits(gb, 4);
899 vc->blocksize[0] = (1 << bl0);
900 vc->blocksize[1] = (1 << bl1);
901 if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
902 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
903 return -3;
904 }
905 // output format int16
906 if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) {
907 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
908 "output packets too large.\n");
909 return -4;
910 }
911 vc->win[0] = ff_vorbis_vwin[bl0 - 6];
912 vc->win[1] = ff_vorbis_vwin[bl1 - 6];
913
914 if ((get_bits1(gb)) == 0) {
915 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
916 return -2;
917 }
918
919 vc->channel_residues = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(float));
920 vc->channel_floors = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(float));
921 vc->saved = av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(float));
922 vc->previous_window = 0;
923
924 ff_mdct_init(&vc->mdct[0], bl0, 1, vc->exp_bias ? -(1 << 15) : -1.0);
925 ff_mdct_init(&vc->mdct[1], bl1, 1, vc->exp_bias ? -(1 << 15) : -1.0);
926
927 AV_DEBUG(" 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 ",
928 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
929
930 /*
931 BLK = vc->blocksize[0];
932 for (i = 0; i < BLK / 2; ++i) {
933 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)));
934 }
935 */
936
937 return 0;
938 }
939
940 // Process the extradata using the functions above (identification header, setup header)
941
942 static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
943 {
944 vorbis_context *vc = avccontext->priv_data ;
945 uint8_t *headers = avccontext->extradata;
946 int headers_len = avccontext->extradata_size;
947 uint8_t *header_start[3];
948 int header_len[3];
949 GetBitContext *gb = &(vc->gb);
950 int hdr_type;
951
952 vc->avccontext = avccontext;
953 dsputil_init(&vc->dsp, avccontext);
954
955 if (vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
956 vc->add_bias = 385;
957 vc->exp_bias = 0;
958 } else {
959 vc->add_bias = 0;
960 vc->exp_bias = 15 << 23;
961 }
962
963 if (!headers_len) {
964 av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");
965 return -1;
966 }
967
968 if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
969 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
970 return -1;
971 }
972
973 init_get_bits(gb, header_start[0], header_len[0]*8);
974 hdr_type = get_bits(gb, 8);
975 if (hdr_type != 1) {
976 av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
977 return -1;
978 }
979 if (vorbis_parse_id_hdr(vc)) {
980 av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
981 vorbis_free(vc);
982 return -1;
983 }
984
985 init_get_bits(gb, header_start[2], header_len[2]*8);
986 hdr_type = get_bits(gb, 8);
987 if (hdr_type != 5) {
988 av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
989 vorbis_free(vc);
990 return -1;
991 }
992 if (vorbis_parse_setup_hdr(vc)) {
993 av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
994 vorbis_free(vc);
995 return -1;
996 }
997
998 if (vc->audio_channels > 8)
999 avccontext->channel_layout = 0;
1000 else
1001 avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
1002
1003 avccontext->channels = vc->audio_channels;
1004 avccontext->sample_rate = vc->audio_samplerate;
1005 avccontext->frame_size = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
1006 avccontext->sample_fmt = SAMPLE_FMT_S16;
1007
1008 return 0 ;
1009 }
1010
1011 // Decode audiopackets -------------------------------------------------
1012
1013 // Read and decode floor
1014
1015 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
1016 vorbis_floor_data *vfu, float *vec)
1017 {
1018 vorbis_floor0 *vf = &vfu->t0;
1019 float *lsp = vf->lsp;
1020 uint_fast32_t amplitude;
1021 uint_fast32_t book_idx;
1022 uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;
1023
1024 amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1025 if (amplitude > 0) {
1026 float last = 0;
1027 uint_fast16_t lsp_len = 0;
1028 uint_fast16_t idx;
1029 vorbis_codebook codebook;
1030
1031 book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1032 if (book_idx >= vf->num_books) {
1033 av_log(vc->avccontext, AV_LOG_ERROR,
1034 "floor0 dec: booknumber too high!\n");
1035 book_idx = 0;
1036 //FIXME: look above
1037 }
1038 AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);
1039 codebook = vc->codebooks[vf->book_list[book_idx]];
1040
1041 while (lsp_len<vf->order) {
1042 int vec_off;
1043
1044 AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);
1045 AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1046 /* read temp vector */
1047 vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1048 codebook.nb_bits, codebook.maxdepth)
1049 * codebook.dimensions;
1050 AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);
1051 /* copy each vector component and add last to it */
1052 for (idx = 0; idx < codebook.dimensions; ++idx)
1053 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1054 last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1055
1056 lsp_len += codebook.dimensions;
1057 }
1058 #ifdef V_DEBUG
1059 /* DEBUG: output lsp coeffs */
1060 {
1061 int idx;
1062 for (idx = 0; idx < lsp_len; ++idx)
1063 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1064 }
1065 #endif
1066
1067 /* synthesize floor output vector */
1068 {
1069 int i;
1070 int order = vf->order;
1071 float wstep = M_PI / vf->bark_map_size;
1072
1073 for (i = 0; i < order; i++)
1074 lsp[i] = 2.0f * cos(lsp[i]);
1075
1076 AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",
1077 vf->map_size, order, wstep);
1078
1079 i = 0;
1080 while (i < vf->map_size[blockflag]) {
1081 int j, iter_cond = vf->map[blockflag][i];
1082 float p = 0.5f;
1083 float q = 0.5f;
1084 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1085
1086 /* similar part for the q and p products */
1087 for (j = 0; j + 1 < order; j += 2) {
1088 q *= lsp[j] - two_cos_w;
1089 p *= lsp[j + 1] - two_cos_w;
1090 }
1091 if (j == order) { // even order
1092 p *= p * (2.0f - two_cos_w);
1093 q *= q * (2.0f + two_cos_w);
1094 } else { // odd order
1095 q *= two_cos_w-lsp[j]; // one more time for q
1096
1097 /* final step and square */
1098 p *= p * (4.f - two_cos_w * two_cos_w);
1099 q *= q;
1100 }
1101
1102 /* calculate linear floor value */
1103 {
1104 q = exp((((amplitude*vf->amplitude_offset) /
1105 (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1106 - vf->amplitude_offset) * .11512925f);
1107 }
1108
1109 /* fill vector */
1110 do {
1111 vec[i] = q; ++i;
1112 } while (vf->map[blockflag][i] == iter_cond);
1113 }
1114 }
1115 } else {
1116 /* this channel is unused */
1117 return 1;
1118 }
1119
1120 AV_DEBUG(" Floor0 decoded\n");
1121
1122 return 0;
1123 }
1124
1125 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
1126 vorbis_floor_data *vfu, float *vec)
1127 {
1128 vorbis_floor1 *vf = &vfu->t1;
1129 GetBitContext *gb = &vc->gb;
1130 uint_fast16_t range_v[4] = { 256, 128, 86, 64 };
1131 uint_fast16_t range = range_v[vf->multiplier-1];
1132 uint_fast16_t floor1_Y[258];
1133 uint_fast16_t floor1_Y_final[258];
1134 int floor1_flag[258];
1135 uint_fast8_t class_;
1136 uint_fast8_t cdim;
1137 uint_fast8_t cbits;
1138 uint_fast8_t csub;
1139 uint_fast8_t cval;
1140 int_fast16_t book;
1141 uint_fast16_t offset;
1142 uint_fast16_t i,j;
1143 /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx = (unsigned)dy/adx ?
1144 int_fast16_t dy, err;
1145
1146
1147 if (!get_bits1(gb)) // silence
1148 return 1;
1149
1150 // Read values (or differences) for the floor's points
1151
1152 floor1_Y[0] = get_bits(gb, ilog(range - 1));
1153 floor1_Y[1] = get_bits(gb, ilog(range - 1));
1154
1155 AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1156
1157 offset = 2;
1158 for (i = 0; i < vf->partitions; ++i) {
1159 class_ = vf->partition_class[i];
1160 cdim = vf->class_dimensions[class_];
1161 cbits = vf->class_subclasses[class_];
1162 csub = (1 << cbits) - 1;
1163 cval = 0;
1164
1165 AV_DEBUG("Cbits %d \n", cbits);
1166
1167 if (cbits) // this reads all subclasses for this partition's class
1168 cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1169 vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1170
1171 for (j = 0; j < cdim; ++j) {
1172 book = vf->subclass_books[class_][cval & csub];
1173
1174 AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb));
1175
1176 cval = cval >> cbits;
1177 if (book > -1) {
1178 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1179 vc->codebooks[book].nb_bits, 3);
1180 } else {
1181 floor1_Y[offset+j] = 0;
1182 }
1183
1184 AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1185 }
1186 offset+=cdim;
1187 }
1188
1189 // Amplitude calculation from the differences
1190
1191 floor1_flag[0] = 1;
1192 floor1_flag[1] = 1;
1193 floor1_Y_final[0] = floor1_Y[0];
1194 floor1_Y_final[1] = floor1_Y[1];
1195
1196 for (i = 2; i < vf->x_list_dim; ++i) {
1197 uint_fast16_t val, highroom, lowroom, room;
1198 uint_fast16_t high_neigh_offs;
1199 uint_fast16_t low_neigh_offs;
1200
1201 low_neigh_offs = vf->list[i].low;
1202 high_neigh_offs = vf->list[i].high;
1203 dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1204 adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1205 ady = FFABS(dy);
1206 err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1207 off = (int16_t)err / (int16_t)adx;
1208 if (dy < 0) {
1209 predicted = floor1_Y_final[low_neigh_offs] - off;
1210 } else {
1211 predicted = floor1_Y_final[low_neigh_offs] + off;
1212 } // render_point end
1213
1214 val = floor1_Y[i];
1215 highroom = range-predicted;
1216 lowroom = predicted;
1217 if (highroom < lowroom) {
1218 room = highroom * 2;
1219 } else {
1220 room = lowroom * 2; // SPEC mispelling
1221 }
1222 if (val) {
1223 floor1_flag[low_neigh_offs] = 1;
1224 floor1_flag[high_neigh_offs] = 1;
1225 floor1_flag[i] = 1;
1226 if (val >= room) {
1227 if (highroom > lowroom) {
1228 floor1_Y_final[i] = val - lowroom + predicted;
1229 } else {
1230 floor1_Y_final[i] = predicted - val + highroom - 1;
1231 }
1232 } else {
1233 if (val & 1) {
1234 floor1_Y_final[i] = predicted - (val + 1) / 2;
1235 } else {
1236 floor1_Y_final[i] = predicted + val / 2;
1237 }
1238 }
1239 } else {
1240 floor1_flag[i] = 0;
1241 floor1_Y_final[i] = predicted;
1242 }
1243
1244 AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1245 }
1246
1247 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1248
1249 ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1250
1251 AV_DEBUG(" Floor decoded\n");
1252
1253 return 0;
1254 }
1255
1256 // Read and decode residue
1257
1258 static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1259 vorbis_residue *vr,
1260 uint_fast8_t ch,
1261 uint_fast8_t *do_not_decode,
1262 float *vec,
1263 uint_fast16_t vlen,
1264 int vr_type)
1265 {
1266 GetBitContext *gb = &vc->gb;
1267 uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;
1268 uint_fast16_t ptns_to_read = vr->ptns_to_read;
1269 uint_fast8_t *classifs = vr->classifs;
1270 uint_fast8_t pass;
1271 uint_fast8_t ch_used;
1272 uint_fast8_t i,j,l;
1273 uint_fast16_t k;
1274
1275 if (vr_type == 2) {
1276 for (j = 1; j < ch; ++j)
1277 do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1278 if (do_not_decode[0])
1279 return 0;
1280 ch_used = 1;
1281 } else {
1282 ch_used = ch;
1283 }
1284
1285 AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1286
1287 for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1288 uint_fast16_t voffset;
1289 uint_fast16_t partition_count;
1290 uint_fast16_t j_times_ptns_to_read;
1291
1292 voffset = vr->begin;
1293 for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1294 if (!pass) {
1295 uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1296 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1297 if (!do_not_decode[j]) {
1298 uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1299 vc->codebooks[vr->classbook].nb_bits, 3);
1300
1301 AV_DEBUG("Classword: %d \n", temp);
1302
1303 assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1304 for (i = 0; i < c_p_c; ++i) {
1305 uint_fast32_t temp2;
1306
1307 temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;
1308 if (partition_count + c_p_c - 1 - i < ptns_to_read)
1309 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1310 temp = temp2;
1311 }
1312 }
1313 j_times_ptns_to_read += ptns_to_read;
1314 }
1315 }
1316 for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1317 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1318 uint_fast16_t voffs;
1319
1320 if (!do_not_decode[j]) {
1321 uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];
1322 int_fast16_t vqbook = vr->books[vqclass][pass];
1323
1324 if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1325 uint_fast16_t coffs;
1326 unsigned dim = vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1327 uint_fast16_t step = dim == 1 ? vr->partition_size
1328 : FASTDIV(vr->partition_size, dim);
1329 vorbis_codebook codebook = vc->codebooks[vqbook];
1330
1331 if (vr_type == 0) {
1332
1333 voffs = voffset+j*vlen;
1334 for (k = 0; k < step; ++k) {
1335 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1336 for (l = 0; l < dim; ++l)
1337 vec[voffs + k + l * step] += codebook.codevectors[coffs + l]; // FPMATH
1338 }
1339 } else if (vr_type == 1) {
1340 voffs = voffset + j * vlen;
1341 for (k = 0; k < step; ++k) {
1342 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1343 for (l = 0; l < dim; ++l, ++voffs) {
1344 vec[voffs]+=codebook.codevectors[coffs+l]; // FPMATH
1345
1346 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1347 }
1348 }
1349 } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1350 voffs = voffset >> 1;
1351
1352 if (dim == 2) {
1353 for (k = 0; k < step; ++k) {
1354 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1355 vec[voffs + k ] += codebook.codevectors[coffs ]; // FPMATH
1356 vec[voffs + k + vlen] += codebook.codevectors[coffs + 1]; // FPMATH
1357 }
1358 } else if (dim == 4) {
1359 for (k = 0; k < step; ++k, voffs += 2) {
1360 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1361 vec[voffs ] += codebook.codevectors[coffs ]; // FPMATH
1362 vec[voffs + 1 ] += codebook.codevectors[coffs + 2]; // FPMATH
1363 vec[voffs + vlen ] += codebook.codevectors[coffs + 1]; // FPMATH
1364 vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3]; // FPMATH
1365 }
1366 } else
1367 for (k = 0; k < step; ++k) {
1368 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1369 for (l = 0; l < dim; l += 2, voffs++) {
1370 vec[voffs ] += codebook.codevectors[coffs + l ]; // FPMATH
1371 vec[voffs + vlen] += codebook.codevectors[coffs + l + 1]; // FPMATH
1372
1373 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n", pass, voffset / ch + (voffs % ch) * vlen, vec[voffset / ch + (voffs % ch) * vlen], codebook.codevectors[coffs + l], coffs, l);
1374 }
1375 }
1376
1377 } else if (vr_type == 2) {
1378 voffs = voffset;
1379
1380 for (k = 0; k < step; ++k) {
1381 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1382 for (l = 0; l < dim; ++l, ++voffs) {
1383 vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l]; // FPMATH FIXME use if and counter instead of / and %
1384
1385 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d \n", pass, voffset / ch + (voffs % ch) * vlen, vec[voffset / ch + (voffs % ch) * vlen], codebook.codevectors[coffs + l], coffs, l);
1386 }
1387 }
1388 }
1389 }
1390 }
1391 j_times_ptns_to_read += ptns_to_read;
1392 }
1393 ++partition_count;
1394 voffset += vr->partition_size;
1395 }
1396 }
1397 }
1398 return 0;
1399 }
1400
1401 static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1402 uint_fast8_t ch,
1403 uint_fast8_t *do_not_decode,
1404 float *vec, uint_fast16_t vlen)
1405 {
1406 if (vr->type == 2)
1407 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1408 else if (vr->type == 1)
1409 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1410 else if (vr->type == 0)
1411 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1412 else {
1413 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1414 return -1;
1415 }
1416 }
1417
1418 void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1419 {
1420 int i;
1421 for (i = 0; i < blocksize; i++) {
1422 if (mag[i] > 0.0) {
1423 if (ang[i] > 0.0) {
1424 ang[i] = mag[i] - ang[i];
1425 } else {
1426 float temp = ang[i];
1427 ang[i] = mag[i];
1428 mag[i] += temp;
1429 }
1430 } else {
1431 if (ang[i] > 0.0) {
1432 ang[i] += mag[i];
1433 } else {
1434 float temp = ang[i];
1435 ang[i] = mag[i];
1436 mag[i] -= temp;
1437 }
1438 }
1439 }
1440 }
1441
1442 static void copy_normalize(float *dst, float *src, int len, int exp_bias,
1443 float add_bias)
1444 {
1445 int i;
1446 if (exp_bias) {
1447 memcpy(dst, src, len * sizeof(float));
1448 } else {
1449 for (i = 0; i < len; i++)
1450 dst[i] = src[i] + add_bias;
1451 }
1452 }
1453
1454 // Decode the audio packet using the functions above
1455
1456 static int vorbis_parse_audio_packet(vorbis_context *vc)
1457 {
1458 GetBitContext *gb = &vc->gb;
1459
1460 uint_fast8_t previous_window = vc->previous_window;
1461 uint_fast8_t mode_number;
1462 uint_fast8_t blockflag;
1463 uint_fast16_t blocksize;
1464 int_fast32_t i,j;
1465 uint_fast8_t no_residue[255];
1466 uint_fast8_t do_not_decode[255];
1467 vorbis_mapping *mapping;
1468 float *ch_res_ptr = vc->channel_residues;
1469 float *ch_floor_ptr = vc->channel_floors;
1470 uint_fast8_t res_chan[255];
1471 uint_fast8_t res_num = 0;
1472 int_fast16_t retlen = 0;
1473 float fadd_bias = vc->add_bias;
1474
1475 if (get_bits1(gb)) {
1476 av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1477 return -1; // packet type not audio
1478 }
1479
1480 if (vc->mode_count == 1) {
1481 mode_number = 0;
1482 } else {
1483 GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
1484 }
1485 vc->mode_number = mode_number;
1486 mapping = &vc->mappings[vc->modes[mode_number].mapping];
1487
1488 AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1489
1490 blockflag = vc->modes[mode_number].blockflag;
1491 blocksize = vc->blocksize[blockflag];
1492 if (blockflag)
1493 skip_bits(gb, 2); // previous_window, next_window
1494
1495 memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1496 memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1497
1498 // Decode floor
1499
1500 for (i = 0; i < vc->audio_channels; ++i) {
1501 vorbis_floor *floor;
1502 if (mapping->submaps > 1) {
1503 floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1504 } else {
1505 floor = &vc->floors[mapping->submap_floor[0]];
1506 }
1507
1508 no_residue[i] = floor->decode(vc, &floor->data, ch_floor_ptr);
1509 ch_floor_ptr += blocksize / 2;
1510 }
1511
1512 // Nonzero vector propagate
1513
1514 for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1515 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1516 no_residue[mapping->magnitude[i]] = 0;
1517 no_residue[mapping->angle[i]] = 0;
1518 }
1519 }
1520
1521 // Decode residue
1522
1523 for (i = 0; i < mapping->submaps; ++i) {
1524 vorbis_residue *residue;
1525 uint_fast8_t ch = 0;
1526
1527 for (j = 0; j < vc->audio_channels; ++j) {
1528 if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1529 res_chan[j] = res_num;
1530 if (no_residue[j]) {
1531 do_not_decode[ch] = 1;
1532 } else {
1533 do_not_decode[ch] = 0;
1534 }
1535 ++ch;
1536 ++res_num;
1537 }
1538 }
1539 residue = &vc->residues[mapping->submap_residue[i]];
1540 vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1541
1542 ch_res_ptr += ch * blocksize / 2;
1543 }
1544
1545 // Inverse coupling
1546
1547 for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1548 float *mag, *ang;
1549
1550 mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1551 ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1552 vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1553 }
1554
1555 // Dotproduct, MDCT
1556
1557 for (j = vc->audio_channels-1;j >= 0; j--) {
1558 ch_floor_ptr = vc->channel_floors + j * blocksize / 2;
1559 ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
1560 vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize / 2);
1561 ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);
1562 }
1563
1564 // Overlap/add, save data for next overlapping FPMATH
1565
1566 retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1567 for (j = 0; j < vc->audio_channels; j++) {
1568 uint_fast16_t bs0 = vc->blocksize[0];
1569 uint_fast16_t bs1 = vc->blocksize[1];
1570 float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1571 float *saved = vc->saved + j * bs1 / 4;
1572 float *ret = vc->channel_floors + j * retlen;
1573 float *buf = residue;
1574 const float *win = vc->win[blockflag & previous_window];
1575
1576 if (blockflag == previous_window) {
1577 vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize / 4);
1578 } else if (blockflag > previous_window) {
1579 vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0 / 4);
1580 copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1581 } else {
1582 copy_normalize(ret, saved, (bs1 - bs0) / 4, vc->exp_bias, fadd_bias);
1583 vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, fadd_bias, bs0 / 4);
1584 }
1585 memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1586 }
1587
1588 vc->previous_window = blockflag;
1589 return retlen;
1590 }
1591
1592 // Return the decoded audio packet through the standard api
1593
1594 static int vorbis_decode_frame(AVCodecContext *avccontext,
1595 void *data, int *data_size,
1596 AVPacket *avpkt)
1597 {
1598 const uint8_t *buf = avpkt->data;
1599 int buf_size = avpkt->size;
1600 vorbis_context *vc = avccontext->priv_data ;
1601 GetBitContext *gb = &(vc->gb);
1602 const float *channel_ptrs[255];
1603 int i;
1604
1605 int_fast16_t len;
1606
1607 if (!buf_size)
1608 return 0;
1609
1610 AV_DEBUG("packet length %d \n", buf_size);
1611
1612 init_get_bits(gb, buf, buf_size*8);
1613
1614 len = vorbis_parse_audio_packet(vc);
1615
1616 if (len <= 0) {
1617 *data_size = 0;
1618 return buf_size;
1619 }
1620
1621 if (!vc->first_frame) {
1622 vc->first_frame = 1;
1623 *data_size = 0;
1624 return buf_size ;
1625 }
1626
1627 AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1628
1629 if (vc->audio_channels > 8) {
1630 for (i = 0; i < vc->audio_channels; i++)
1631 channel_ptrs[i] = vc->channel_floors + i * len;
1632 } else {
1633 for (i = 0; i < vc->audio_channels; i++)
1634 channel_ptrs[i] = vc->channel_floors +
1635 len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
1636 }
1637
1638 vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);
1639 *data_size = len * 2 * vc->audio_channels;
1640
1641 return buf_size ;
1642 }
1643
1644 // Close decoder
1645
1646 static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
1647 {
1648 vorbis_context *vc = avccontext->priv_data;
1649
1650 vorbis_free(vc);
1651
1652 return 0 ;
1653 }
1654
1655 AVCodec vorbis_decoder = {
1656 "vorbis",
1657 AVMEDIA_TYPE_AUDIO,
1658 CODEC_ID_VORBIS,
1659 sizeof(vorbis_context),
1660 vorbis_decode_init,
1661 NULL,
1662 vorbis_decode_close,
1663 vorbis_decode_frame,
1664 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1665 .channel_layouts = ff_vorbis_channel_layouts,
1666 };
1667