2 * @file libavcodec/vorbis_dec.c
4 * @author Denes Balatoni ( dbalatoni programozo hu )
6 * This file is part of FFmpeg.
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.
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.
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
25 //#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)
29 #define ALT_BITSTREAM_READER_LE
39 #define V_MAX_VLCS (1 << 16)
40 #define V_MAX_PARTITIONS (1 << 20)
50 uint_fast8_t dimensions;
51 uint_fast8_t lookup_type;
52 uint_fast8_t maxdepth;
58 typedef union vorbis_floor_u vorbis_floor_data;
59 typedef struct vorbis_floor0_s vorbis_floor0;
60 typedef struct vorbis_floor1_s vorbis_floor1;
61 struct vorbis_context_s;
63 uint_fast8_t (* vorbis_floor_decode_func)
64 (struct vorbis_context_s *, vorbis_floor_data *, float *);
66 uint_fast8_t floor_type;
67 vorbis_floor_decode_func decode;
68 union vorbis_floor_u {
69 struct vorbis_floor0_s {
72 uint_fast16_t bark_map_size;
74 uint_fast32_t map_size[2];
75 uint_fast8_t amplitude_bits;
76 uint_fast8_t amplitude_offset;
77 uint_fast8_t num_books;
78 uint_fast8_t *book_list;
81 struct vorbis_floor1_s {
82 uint_fast8_t partitions;
83 uint_fast8_t maximum_class;
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;
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;
108 uint_fast8_t submaps;
109 uint_fast16_t coupling_steps;
110 uint_fast8_t *magnitude;
113 uint_fast8_t submap_floor[16];
114 uint_fast8_t submap_residue[16];
118 uint_fast8_t blockflag;
119 uint_fast16_t windowtype;
120 uint_fast16_t transformtype;
121 uint_fast8_t mapping;
124 typedef struct vorbis_context_s {
125 AVCodecContext *avccontext;
130 uint_fast8_t first_frame;
131 uint_fast32_t version;
132 uint_fast8_t audio_channels;
133 uint_fast32_t audio_samplerate;
134 uint_fast32_t bitrate_maximum;
135 uint_fast32_t bitrate_nominal;
136 uint_fast32_t bitrate_minimum;
137 uint_fast32_t blocksize[2];
139 uint_fast16_t codebook_count;
140 vorbis_codebook *codebooks;
141 uint_fast8_t floor_count;
142 vorbis_floor *floors;
143 uint_fast8_t residue_count;
144 vorbis_residue *residues;
145 uint_fast8_t mapping_count;
146 vorbis_mapping *mappings;
147 uint_fast8_t mode_count;
149 uint_fast8_t mode_number; // mode number for the current packet
150 uint_fast8_t previous_window;
151 float *channel_residues;
152 float *channel_floors;
154 uint_fast32_t add_bias; // for float->int conversion
155 uint_fast32_t exp_bias;
158 /* Helper functions */
161 (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
163 static float vorbisfloat2float(uint_fast32_t val)
165 double mant = val & 0x1fffff;
166 long exp = (val & 0x7fe00000L) >> 21;
167 if (val & 0x80000000)
169 return ldexp(mant, exp - 20 - 768);
173 // Free all allocated memory -----------------------------------------
175 static void vorbis_free(vorbis_context *vc)
179 av_freep(&vc->channel_residues);
180 av_freep(&vc->channel_floors);
181 av_freep(&vc->saved);
183 av_freep(&vc->residues);
184 av_freep(&vc->modes);
186 ff_mdct_end(&vc->mdct[0]);
187 ff_mdct_end(&vc->mdct[1]);
189 for (i = 0; i < vc->codebook_count; ++i) {
190 av_free(vc->codebooks[i].codevectors);
191 free_vlc(&vc->codebooks[i].vlc);
193 av_freep(&vc->codebooks);
195 for (i = 0; i < vc->floor_count; ++i) {
196 if (vc->floors[i].floor_type == 0) {
197 av_free(vc->floors[i].data.t0.map[0]);
198 av_free(vc->floors[i].data.t0.map[1]);
199 av_free(vc->floors[i].data.t0.book_list);
200 av_free(vc->floors[i].data.t0.lsp);
202 av_free(vc->floors[i].data.t1.list);
205 av_freep(&vc->floors);
207 for (i = 0; i < vc->mapping_count; ++i) {
208 av_free(vc->mappings[i].magnitude);
209 av_free(vc->mappings[i].angle);
210 av_free(vc->mappings[i].mux);
212 av_freep(&vc->mappings);
215 // Parse setup header -------------------------------------------------
217 // Process codebooks part
219 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
222 uint8_t *tmp_vlc_bits;
223 uint32_t *tmp_vlc_codes;
224 GetBitContext *gb = &vc->gb;
226 vc->codebook_count = get_bits(gb, 8) + 1;
228 AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
230 vc->codebooks = av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
231 tmp_vlc_bits = av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
232 tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
234 for (cb = 0; cb < vc->codebook_count; ++cb) {
235 vorbis_codebook *codebook_setup = &vc->codebooks[cb];
236 uint_fast8_t ordered;
237 uint_fast32_t t, used_entries = 0;
238 uint_fast32_t entries;
240 AV_DEBUG(" %d. Codebook \n", cb);
242 if (get_bits(gb, 24) != 0x564342) {
243 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
247 codebook_setup->dimensions=get_bits(gb, 16);
248 if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
249 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions);
252 entries = get_bits(gb, 24);
253 if (entries > V_MAX_VLCS) {
254 av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
258 ordered = get_bits1(gb);
260 AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
265 uint_fast8_t sparse = get_bits1(gb);
267 AV_DEBUG(" not ordered \n");
270 AV_DEBUG(" sparse \n");
273 for (ce = 0; ce < entries; ++ce) {
274 flag = get_bits1(gb);
276 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
279 tmp_vlc_bits[ce] = 0;
282 AV_DEBUG(" not sparse \n");
284 used_entries = entries;
285 for (ce = 0; ce < entries; ++ce)
286 tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
289 uint_fast16_t current_entry = 0;
290 uint_fast8_t current_length = get_bits(gb, 5)+1;
292 AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME
294 used_entries = entries;
295 for (; current_entry < used_entries && current_length <= 32; ++current_length) {
296 uint_fast16_t i, number;
298 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
300 number = get_bits(gb, ilog(entries - current_entry));
302 AV_DEBUG(" number: %d \n", number);
304 for (i = current_entry; i < number+current_entry; ++i)
305 if (i < used_entries)
306 tmp_vlc_bits[i] = current_length;
308 current_entry+=number;
310 if (current_entry>used_entries) {
311 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
316 codebook_setup->lookup_type = get_bits(gb, 4);
318 AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup");
320 // If the codebook is used for (inverse) VQ, calculate codevectors.
322 if (codebook_setup->lookup_type == 1) {
323 uint_fast16_t i, j, k;
324 uint_fast16_t codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
325 uint_fast16_t codebook_multiplicands[codebook_lookup_values];
327 float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
328 float codebook_delta_value = vorbisfloat2float(get_bits_long(gb, 32));
329 uint_fast8_t codebook_value_bits = get_bits(gb, 4)+1;
330 uint_fast8_t codebook_sequence_p = get_bits1(gb);
332 AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
333 AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
335 for (i = 0; i < codebook_lookup_values; ++i) {
336 codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
338 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
339 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
342 // Weed out unused vlcs and build codevector vector
343 codebook_setup->codevectors = used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
344 for (j = 0, i = 0; i < entries; ++i) {
345 uint_fast8_t dim = codebook_setup->dimensions;
347 if (tmp_vlc_bits[i]) {
349 uint_fast32_t lookup_offset = i;
352 av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
355 for (k = 0; k < dim; ++k) {
356 uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
357 codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
358 if (codebook_sequence_p)
359 last = codebook_setup->codevectors[j * dim + k];
360 lookup_offset/=codebook_lookup_values;
362 tmp_vlc_bits[j] = tmp_vlc_bits[i];
365 av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
366 for (k = 0; k < dim; ++k)
367 av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j * dim + k]);
368 av_log(vc->avccontext, AV_LOG_INFO, "\n");
374 if (j != used_entries) {
375 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
378 entries = used_entries;
379 } else if (codebook_setup->lookup_type >= 2) {
380 av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
384 // Initialize VLC table
385 if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
386 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
389 codebook_setup->maxdepth = 0;
390 for (t = 0; t < entries; ++t)
391 if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
392 codebook_setup->maxdepth = tmp_vlc_bits[t];
394 if (codebook_setup->maxdepth > 3 * V_NB_BITS)
395 codebook_setup->nb_bits = V_NB_BITS2;
397 codebook_setup->nb_bits = V_NB_BITS;
399 codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
401 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)) {
402 av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
407 av_free(tmp_vlc_bits);
408 av_free(tmp_vlc_codes);
413 av_free(tmp_vlc_bits);
414 av_free(tmp_vlc_codes);
418 // Process time domain transforms part (unused in Vorbis I)
420 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
422 GetBitContext *gb = &vc->gb;
424 uint_fast8_t vorbis_time_count = get_bits(gb, 6) + 1;
426 for (i = 0; i < vorbis_time_count; ++i) {
427 uint_fast16_t vorbis_tdtransform = get_bits(gb, 16);
429 AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
431 if (vorbis_tdtransform) {
432 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
439 // Process floors part
441 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
442 vorbis_floor_data *vfu, float *vec);
443 static void create_map(vorbis_context *vc, uint_fast8_t floor_number);
444 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
445 vorbis_floor_data *vfu, float *vec);
446 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
448 GetBitContext *gb = &vc->gb;
451 vc->floor_count = get_bits(gb, 6) + 1;
453 vc->floors = av_mallocz(vc->floor_count * sizeof(vorbis_floor));
455 for (i = 0; i < vc->floor_count; ++i) {
456 vorbis_floor *floor_setup = &vc->floors[i];
458 floor_setup->floor_type = get_bits(gb, 16);
460 AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
462 if (floor_setup->floor_type == 1) {
463 uint_fast8_t maximum_class = 0;
464 uint_fast8_t rangebits;
465 uint_fast16_t floor1_values = 2;
467 floor_setup->decode = vorbis_floor1_decode;
469 floor_setup->data.t1.partitions = get_bits(gb, 5);
471 AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
473 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
474 floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
475 if (floor_setup->data.t1.partition_class[j] > maximum_class)
476 maximum_class = floor_setup->data.t1.partition_class[j];
478 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
482 AV_DEBUG(" maximum class %d \n", maximum_class);
484 floor_setup->data.t1.maximum_class = maximum_class;
486 for (j = 0; j <= maximum_class; ++j) {
487 floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
488 floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
490 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]);
492 if (floor_setup->data.t1.class_subclasses[j]) {
493 int bits = get_bits(gb, 8);
494 if (bits >= vc->codebook_count) {
495 av_log(vc->avccontext, AV_LOG_ERROR, "Masterbook index %d is out of range.\n", bits);
498 floor_setup->data.t1.class_masterbook[j] = bits;
500 AV_DEBUG(" masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
503 for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
504 int16_t bits = get_bits(gb, 8) - 1;
505 if (bits != -1 && bits >= vc->codebook_count) {
506 av_log(vc->avccontext, AV_LOG_ERROR, "Subclass book index %d is out of range.\n", bits);
509 floor_setup->data.t1.subclass_books[j][k] = bits;
511 AV_DEBUG(" book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
515 floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
516 floor_setup->data.t1.x_list_dim = 2;
518 for (j = 0; j < floor_setup->data.t1.partitions; ++j)
519 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
521 floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
524 rangebits = get_bits(gb, 4);
525 floor_setup->data.t1.list[0].x = 0;
526 floor_setup->data.t1.list[1].x = (1 << rangebits);
528 for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
529 for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
530 floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
532 AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
536 // Precalculate order of x coordinates - needed for decode
537 ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
538 } else if (floor_setup->floor_type == 0) {
539 uint_fast8_t max_codebook_dim = 0;
541 floor_setup->decode = vorbis_floor0_decode;
543 floor_setup->data.t0.order = get_bits(gb, 8);
544 floor_setup->data.t0.rate = get_bits(gb, 16);
545 floor_setup->data.t0.bark_map_size = get_bits(gb, 16);
546 floor_setup->data.t0.amplitude_bits = get_bits(gb, 6);
547 /* zero would result in a div by zero later *
549 if (floor_setup->data.t0.amplitude_bits == 0) {
550 av_log(vc->avccontext, AV_LOG_ERROR,
551 "Floor 0 amplitude bits is 0.\n");
554 floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
555 floor_setup->data.t0.num_books = get_bits(gb, 4) + 1;
557 /* allocate mem for booklist */
558 floor_setup->data.t0.book_list =
559 av_malloc(floor_setup->data.t0.num_books);
560 if (!floor_setup->data.t0.book_list)
562 /* read book indexes */
565 uint_fast8_t book_idx;
566 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
567 book_idx = get_bits(gb, 8);
568 if (book_idx >= vc->codebook_count)
570 floor_setup->data.t0.book_list[idx] = book_idx;
571 if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
572 max_codebook_dim = vc->codebooks[book_idx].dimensions;
578 /* allocate mem for lsp coefficients */
580 /* codebook dim is for padding if codebook dim doesn't *
581 * divide order+1 then we need to read more data */
582 floor_setup->data.t0.lsp =
583 av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
585 if (!floor_setup->data.t0.lsp)
589 #ifdef V_DEBUG /* debug output parsed headers */
590 AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
591 AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
592 AV_DEBUG("floor0 bark map size: %u\n",
593 floor_setup->data.t0.bark_map_size);
594 AV_DEBUG("floor0 amplitude bits: %u\n",
595 floor_setup->data.t0.amplitude_bits);
596 AV_DEBUG("floor0 amplitude offset: %u\n",
597 floor_setup->data.t0.amplitude_offset);
598 AV_DEBUG("floor0 number of books: %u\n",
599 floor_setup->data.t0.num_books);
600 AV_DEBUG("floor0 book list pointer: %p\n",
601 floor_setup->data.t0.book_list);
604 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
605 AV_DEBUG(" Book %d: %u\n",
607 floor_setup->data.t0.book_list[idx]);
612 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
619 // Process residues part
621 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
623 GetBitContext *gb = &vc->gb;
624 uint_fast8_t i, j, k;
626 vc->residue_count = get_bits(gb, 6)+1;
627 vc->residues = av_mallocz(vc->residue_count * sizeof(vorbis_residue));
629 AV_DEBUG(" There are %d residues. \n", vc->residue_count);
631 for (i = 0; i < vc->residue_count; ++i) {
632 vorbis_residue *res_setup = &vc->residues[i];
633 uint_fast8_t cascade[64];
634 uint_fast8_t high_bits;
635 uint_fast8_t low_bits;
637 res_setup->type = get_bits(gb, 16);
639 AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
641 res_setup->begin = get_bits(gb, 24);
642 res_setup->end = get_bits(gb, 24);
643 res_setup->partition_size = get_bits(gb, 24) + 1;
644 /* Validations to prevent a buffer overflow later. */
645 if (res_setup->begin>res_setup->end ||
646 res_setup->end>vc->blocksize[1] / (res_setup->type == 2 ? 1 : 2) ||
647 (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
648 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);
652 res_setup->classifications = get_bits(gb, 6) + 1;
653 res_setup->classbook = get_bits(gb, 8);
654 if (res_setup->classbook >= vc->codebook_count) {
655 av_log(vc->avccontext, AV_LOG_ERROR, "classbook value %d out of range. \n", res_setup->classbook);
659 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,
660 res_setup->classifications, res_setup->classbook);
662 for (j = 0; j < res_setup->classifications; ++j) {
664 low_bits = get_bits(gb, 3);
666 high_bits = get_bits(gb, 5);
667 cascade[j] = (high_bits << 3) + low_bits;
669 AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j]));
672 res_setup->maxpass = 0;
673 for (j = 0; j < res_setup->classifications; ++j) {
674 for (k = 0; k < 8; ++k) {
675 if (cascade[j]&(1 << k)) {
676 int bits = get_bits(gb, 8);
677 if (bits >= vc->codebook_count) {
678 av_log(vc->avccontext, AV_LOG_ERROR, "book value %d out of range. \n", bits);
681 res_setup->books[j][k] = bits;
683 AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
685 if (k>res_setup->maxpass)
686 res_setup->maxpass = k;
688 res_setup->books[j][k] = -1;
696 // Process mappings part
698 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
700 GetBitContext *gb = &vc->gb;
703 vc->mapping_count = get_bits(gb, 6)+1;
704 vc->mappings = av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
706 AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
708 for (i = 0; i < vc->mapping_count; ++i) {
709 vorbis_mapping *mapping_setup = &vc->mappings[i];
711 if (get_bits(gb, 16)) {
712 av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
716 mapping_setup->submaps = get_bits(gb, 4) + 1;
718 mapping_setup->submaps = 1;
722 mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
723 mapping_setup->magnitude = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
724 mapping_setup->angle = av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
725 for (j = 0; j < mapping_setup->coupling_steps; ++j) {
726 mapping_setup->magnitude[j] = get_bits(gb, ilog(vc->audio_channels - 1));
727 mapping_setup->angle[j] = get_bits(gb, ilog(vc->audio_channels - 1));
728 if (mapping_setup->magnitude[j] >= vc->audio_channels) {
729 av_log(vc->avccontext, AV_LOG_ERROR, "magnitude channel %d out of range. \n", mapping_setup->magnitude[j]);
732 if (mapping_setup->angle[j] >= vc->audio_channels) {
733 av_log(vc->avccontext, AV_LOG_ERROR, "angle channel %d out of range. \n", mapping_setup->angle[j]);
738 mapping_setup->coupling_steps = 0;
741 AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
743 if (get_bits(gb, 2)) {
744 av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
745 return -1; // following spec.
748 if (mapping_setup->submaps>1) {
749 mapping_setup->mux = av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
750 for (j = 0; j < vc->audio_channels; ++j)
751 mapping_setup->mux[j] = get_bits(gb, 4);
754 for (j = 0; j < mapping_setup->submaps; ++j) {
756 skip_bits(gb, 8); // FIXME check?
757 bits = get_bits(gb, 8);
758 if (bits >= vc->floor_count) {
759 av_log(vc->avccontext, AV_LOG_ERROR, "submap floor value %d out of range. \n", bits);
762 mapping_setup->submap_floor[j] = bits;
763 bits = get_bits(gb, 8);
764 if (bits >= vc->residue_count) {
765 av_log(vc->avccontext, AV_LOG_ERROR, "submap residue value %d out of range. \n", bits);
768 mapping_setup->submap_residue[j] = bits;
770 AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
776 // Process modes part
778 static void create_map(vorbis_context *vc, uint_fast8_t floor_number)
780 vorbis_floor *floors = vc->floors;
783 int_fast8_t blockflag;
785 int_fast32_t n; //TODO: could theoretically be smaller?
787 for (blockflag = 0; blockflag < 2; ++blockflag) {
788 n = vc->blocksize[blockflag] / 2;
789 floors[floor_number].data.t0.map[blockflag] =
790 av_malloc((n+1) * sizeof(int_fast32_t)); // n + sentinel
792 map = floors[floor_number].data.t0.map[blockflag];
793 vf = &floors[floor_number].data.t0;
795 for (idx = 0; idx < n; ++idx) {
796 map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
797 ((vf->bark_map_size) /
798 BARK(vf->rate / 2.0f)));
799 if (vf->bark_map_size-1 < map[idx])
800 map[idx] = vf->bark_map_size - 1;
803 vf->map_size[blockflag] = n;
807 for (idx = 0; idx <= n; ++idx) {
808 AV_DEBUG("floor0 map: map at pos %d is %d\n",
814 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
816 GetBitContext *gb = &vc->gb;
819 vc->mode_count = get_bits(gb, 6) + 1;
820 vc->modes = av_mallocz(vc->mode_count * sizeof(vorbis_mode));
822 AV_DEBUG(" There are %d modes.\n", vc->mode_count);
824 for (i = 0; i < vc->mode_count; ++i) {
825 vorbis_mode *mode_setup = &vc->modes[i];
827 mode_setup->blockflag = get_bits1(gb);
828 mode_setup->windowtype = get_bits(gb, 16); //FIXME check
829 mode_setup->transformtype = get_bits(gb, 16); //FIXME check
830 mode_setup->mapping = get_bits(gb, 8);
831 if (mode_setup->mapping >= vc->mapping_count) {
832 av_log(vc->avccontext, AV_LOG_ERROR, "mode mapping value %d out of range. \n", mode_setup->mapping);
836 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);
841 // Process the whole setup header using the functions above
843 static int vorbis_parse_setup_hdr(vorbis_context *vc)
845 GetBitContext *gb = &vc->gb;
847 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
848 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
849 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
850 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
854 if (vorbis_parse_setup_hdr_codebooks(vc)) {
855 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
858 if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
859 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
862 if (vorbis_parse_setup_hdr_floors(vc)) {
863 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
866 if (vorbis_parse_setup_hdr_residues(vc)) {
867 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
870 if (vorbis_parse_setup_hdr_mappings(vc)) {
871 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
874 if (vorbis_parse_setup_hdr_modes(vc)) {
875 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
878 if (!get_bits1(gb)) {
879 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
880 return -8; // framing flag bit unset error
886 // Process the identification header
888 static int vorbis_parse_id_hdr(vorbis_context *vc)
890 GetBitContext *gb = &vc->gb;
891 uint_fast8_t bl0, bl1;
893 if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
894 (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
895 (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
896 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
900 vc->version = get_bits_long(gb, 32); //FIXME check 0
901 vc->audio_channels = get_bits(gb, 8);
902 if (vc->audio_channels <= 0) {
903 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
906 vc->audio_samplerate = get_bits_long(gb, 32);
907 if (vc->audio_samplerate <= 0) {
908 av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
911 vc->bitrate_maximum = get_bits_long(gb, 32);
912 vc->bitrate_nominal = get_bits_long(gb, 32);
913 vc->bitrate_minimum = get_bits_long(gb, 32);
914 bl0 = get_bits(gb, 4);
915 bl1 = get_bits(gb, 4);
916 vc->blocksize[0] = (1 << bl0);
917 vc->blocksize[1] = (1 << bl1);
918 if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
919 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
922 // output format int16
923 if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) {
924 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
925 "output packets too large.\n");
928 vc->win[0] = ff_vorbis_vwin[bl0 - 6];
929 vc->win[1] = ff_vorbis_vwin[bl1 - 6];
931 if ((get_bits1(gb)) == 0) {
932 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
936 vc->channel_residues = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(float));
937 vc->channel_floors = av_malloc((vc->blocksize[1] / 2) * vc->audio_channels * sizeof(float));
938 vc->saved = av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(float));
939 vc->previous_window = 0;
941 ff_mdct_init(&vc->mdct[0], bl0, 1, vc->exp_bias ? -(1 << 15) : -1.0);
942 ff_mdct_init(&vc->mdct[1], bl1, 1, vc->exp_bias ? -(1 << 15) : -1.0);
944 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 ",
945 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
948 BLK = vc->blocksize[0];
949 for (i = 0; i < BLK / 2; ++i) {
950 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)));
957 // Process the extradata using the functions above (identification header, setup header)
959 static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
961 vorbis_context *vc = avccontext->priv_data ;
962 uint8_t *headers = avccontext->extradata;
963 int headers_len = avccontext->extradata_size;
964 uint8_t *header_start[3];
966 GetBitContext *gb = &(vc->gb);
969 vc->avccontext = avccontext;
970 dsputil_init(&vc->dsp, avccontext);
972 if (vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
977 vc->exp_bias = 15 << 23;
981 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
985 if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
986 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
990 init_get_bits(gb, header_start[0], header_len[0]*8);
991 hdr_type = get_bits(gb, 8);
993 av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
996 if (vorbis_parse_id_hdr(vc)) {
997 av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
1002 init_get_bits(gb, header_start[2], header_len[2]*8);
1003 hdr_type = get_bits(gb, 8);
1004 if (hdr_type != 5) {
1005 av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
1009 if (vorbis_parse_setup_hdr(vc)) {
1010 av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
1015 avccontext->channels = vc->audio_channels;
1016 avccontext->sample_rate = vc->audio_samplerate;
1017 avccontext->frame_size = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
1018 avccontext->sample_fmt = SAMPLE_FMT_S16;
1023 // Decode audiopackets -------------------------------------------------
1025 // Read and decode floor
1027 static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,
1028 vorbis_floor_data *vfu, float *vec)
1030 vorbis_floor0 *vf = &vfu->t0;
1031 float *lsp = vf->lsp;
1032 uint_fast32_t amplitude;
1033 uint_fast32_t book_idx;
1034 uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;
1036 amplitude = get_bits(&vc->gb, vf->amplitude_bits);
1037 if (amplitude > 0) {
1039 uint_fast16_t lsp_len = 0;
1041 vorbis_codebook codebook;
1043 book_idx = get_bits(&vc->gb, ilog(vf->num_books));
1044 if (book_idx >= vf->num_books) {
1045 av_log(vc->avccontext, AV_LOG_ERROR,
1046 "floor0 dec: booknumber too high!\n");
1050 AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);
1051 codebook = vc->codebooks[vf->book_list[book_idx]];
1053 while (lsp_len<vf->order) {
1056 AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);
1057 AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);
1058 /* read temp vector */
1059 vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
1060 codebook.nb_bits, codebook.maxdepth)
1061 * codebook.dimensions;
1062 AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);
1063 /* copy each vector component and add last to it */
1064 for (idx = 0; idx < codebook.dimensions; ++idx)
1065 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
1066 last = lsp[lsp_len+idx-1]; /* set last to last vector component */
1068 lsp_len += codebook.dimensions;
1071 /* DEBUG: output lsp coeffs */
1074 for (idx = 0; idx < lsp_len; ++idx)
1075 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
1079 /* synthesize floor output vector */
1082 int order = vf->order;
1083 float wstep = M_PI / vf->bark_map_size;
1085 for (i = 0; i < order; i++)
1086 lsp[i] = 2.0f * cos(lsp[i]);
1088 AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",
1089 vf->map_size, order, wstep);
1092 while (i < vf->map_size[blockflag]) {
1093 int j, iter_cond = vf->map[blockflag][i];
1096 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
1098 /* similar part for the q and p products */
1099 for (j = 0; j + 1 < order; j += 2) {
1100 q *= lsp[j] - two_cos_w;
1101 p *= lsp[j + 1] - two_cos_w;
1103 if (j == order) { // even order
1104 p *= p * (2.0f - two_cos_w);
1105 q *= q * (2.0f + two_cos_w);
1106 } else { // odd order
1107 q *= two_cos_w-lsp[j]; // one more time for q
1109 /* final step and square */
1110 p *= p * (4.f - two_cos_w * two_cos_w);
1114 /* calculate linear floor value */
1116 q = exp((((amplitude*vf->amplitude_offset) /
1117 (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
1118 - vf->amplitude_offset) * .11512925f);
1124 } while (vf->map[blockflag][i] == iter_cond);
1128 /* this channel is unused */
1132 AV_DEBUG(" Floor0 decoded\n");
1137 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,
1138 vorbis_floor_data *vfu, float *vec)
1140 vorbis_floor1 *vf = &vfu->t1;
1141 GetBitContext *gb = &vc->gb;
1142 uint_fast16_t range_v[4] = { 256, 128, 86, 64 };
1143 uint_fast16_t range = range_v[vf->multiplier-1];
1144 uint_fast16_t floor1_Y[vf->x_list_dim];
1145 uint_fast16_t floor1_Y_final[vf->x_list_dim];
1146 int floor1_flag[vf->x_list_dim];
1147 uint_fast8_t class_;
1153 uint_fast16_t offset;
1155 /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx = (unsigned)dy/adx ?
1156 int_fast16_t dy, err;
1159 if (!get_bits1(gb)) // silence
1162 // Read values (or differences) for the floor's points
1164 floor1_Y[0] = get_bits(gb, ilog(range - 1));
1165 floor1_Y[1] = get_bits(gb, ilog(range - 1));
1167 AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
1170 for (i = 0; i < vf->partitions; ++i) {
1171 class_ = vf->partition_class[i];
1172 cdim = vf->class_dimensions[class_];
1173 cbits = vf->class_subclasses[class_];
1174 csub = (1 << cbits) - 1;
1177 AV_DEBUG("Cbits %d \n", cbits);
1179 if (cbits) // this reads all subclasses for this partition's class
1180 cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
1181 vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
1183 for (j = 0; j < cdim; ++j) {
1184 book = vf->subclass_books[class_][cval & csub];
1186 AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb));
1188 cval = cval >> cbits;
1190 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
1191 vc->codebooks[book].nb_bits, 3);
1193 floor1_Y[offset+j] = 0;
1196 AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
1201 // Amplitude calculation from the differences
1205 floor1_Y_final[0] = floor1_Y[0];
1206 floor1_Y_final[1] = floor1_Y[1];
1208 for (i = 2; i < vf->x_list_dim; ++i) {
1209 uint_fast16_t val, highroom, lowroom, room;
1210 uint_fast16_t high_neigh_offs;
1211 uint_fast16_t low_neigh_offs;
1213 low_neigh_offs = vf->list[i].low;
1214 high_neigh_offs = vf->list[i].high;
1215 dy = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs]; // render_point begin
1216 adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
1218 err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
1219 off = (int16_t)err / (int16_t)adx;
1221 predicted = floor1_Y_final[low_neigh_offs] - off;
1223 predicted = floor1_Y_final[low_neigh_offs] + off;
1224 } // render_point end
1227 highroom = range-predicted;
1228 lowroom = predicted;
1229 if (highroom < lowroom) {
1230 room = highroom * 2;
1232 room = lowroom * 2; // SPEC mispelling
1235 floor1_flag[low_neigh_offs] = 1;
1236 floor1_flag[high_neigh_offs] = 1;
1239 if (highroom > lowroom) {
1240 floor1_Y_final[i] = val - lowroom + predicted;
1242 floor1_Y_final[i] = predicted - val + highroom - 1;
1246 floor1_Y_final[i] = predicted - (val + 1) / 2;
1248 floor1_Y_final[i] = predicted + val / 2;
1253 floor1_Y_final[i] = predicted;
1256 AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
1259 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
1261 ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
1263 AV_DEBUG(" Floor decoded\n");
1268 // Read and decode residue
1270 static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
1273 uint_fast8_t *do_not_decode,
1278 GetBitContext *gb = &vc->gb;
1279 uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;
1280 uint_fast16_t n_to_read = vr->end-vr->begin;
1281 uint_fast16_t ptns_to_read = n_to_read/vr->partition_size;
1282 uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
1284 uint_fast8_t ch_used;
1289 for (j = 1; j < ch; ++j)
1290 do_not_decode[0] &= do_not_decode[j]; // FIXME - clobbering input
1291 if (do_not_decode[0])
1298 AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1300 for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
1301 uint_fast16_t voffset;
1302 uint_fast16_t partition_count;
1303 uint_fast16_t j_times_ptns_to_read;
1305 voffset = vr->begin;
1306 for (partition_count = 0; partition_count < ptns_to_read;) { // SPEC error
1308 uint_fast32_t inverse_class = ff_inverse[vr->classifications];
1309 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1310 if (!do_not_decode[j]) {
1311 uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1312 vc->codebooks[vr->classbook].nb_bits, 3);
1314 AV_DEBUG("Classword: %d \n", temp);
1316 assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
1317 for (i = 0; i < c_p_c; ++i) {
1318 uint_fast32_t temp2;
1320 temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;
1321 if (partition_count + c_p_c - 1 - i < ptns_to_read)
1322 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
1326 j_times_ptns_to_read += ptns_to_read;
1329 for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
1330 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
1331 uint_fast16_t voffs;
1333 if (!do_not_decode[j]) {
1334 uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];
1335 int_fast16_t vqbook = vr->books[vqclass][pass];
1337 if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
1338 uint_fast16_t coffs;
1339 unsigned dim = vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
1340 uint_fast16_t step = dim == 1 ? vr->partition_size
1341 : FASTDIV(vr->partition_size, dim);
1342 vorbis_codebook codebook = vc->codebooks[vqbook];
1346 voffs = voffset+j*vlen;
1347 for (k = 0; k < step; ++k) {
1348 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1349 for (l = 0; l < dim; ++l)
1350 vec[voffs + k + l * step] += codebook.codevectors[coffs + l]; // FPMATH
1352 } else if (vr_type == 1) {
1353 voffs = voffset + j * vlen;
1354 for (k = 0; k < step; ++k) {
1355 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1356 for (l = 0; l < dim; ++l, ++voffs) {
1357 vec[voffs]+=codebook.codevectors[coffs+l]; // FPMATH
1359 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
1362 } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
1363 voffs = voffset >> 1;
1366 for (k = 0; k < step; ++k) {
1367 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
1368 vec[voffs + k ] += codebook.codevectors[coffs ]; // FPMATH
1369 vec[voffs + k + vlen] += codebook.codevectors[coffs + 1]; // FPMATH
1371 } else if (dim == 4) {
1372 for (k = 0; k < step; ++k, voffs += 2) {
1373 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
1374 vec[voffs ] += codebook.codevectors[coffs ]; // FPMATH
1375 vec[voffs + 1 ] += codebook.codevectors[coffs + 2]; // FPMATH
1376 vec[voffs + vlen ] += codebook.codevectors[coffs + 1]; // FPMATH
1377 vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3]; // FPMATH
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 += 2, voffs++) {
1383 vec[voffs ] += codebook.codevectors[coffs + l ]; // FPMATH
1384 vec[voffs + vlen] += codebook.codevectors[coffs + l + 1]; // FPMATH
1386 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);
1390 } else if (vr_type == 2) {
1393 for (k = 0; k < step; ++k) {
1394 coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
1395 for (l = 0; l < dim; ++l, ++voffs) {
1396 vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l]; // FPMATH FIXME use if and counter instead of / and %
1398 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);
1404 j_times_ptns_to_read += ptns_to_read;
1407 voffset += vr->partition_size;
1414 static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
1416 uint_fast8_t *do_not_decode,
1417 float *vec, uint_fast16_t vlen)
1420 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
1421 else if (vr->type == 1)
1422 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
1423 else if (vr->type == 0)
1424 return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
1426 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1431 void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
1434 for (i = 0; i < blocksize; i++) {
1437 ang[i] = mag[i] - ang[i];
1439 float temp = ang[i];
1447 float temp = ang[i];
1455 static void copy_normalize(float *dst, float *src, int len, int exp_bias,
1460 memcpy(dst, src, len * sizeof(float));
1462 for (i = 0; i < len; i++)
1463 dst[i] = src[i] + add_bias;
1467 // Decode the audio packet using the functions above
1469 static int vorbis_parse_audio_packet(vorbis_context *vc)
1471 GetBitContext *gb = &vc->gb;
1473 uint_fast8_t previous_window = vc->previous_window;
1474 uint_fast8_t mode_number;
1475 uint_fast8_t blockflag;
1476 uint_fast16_t blocksize;
1478 uint_fast8_t no_residue[vc->audio_channels];
1479 uint_fast8_t do_not_decode[vc->audio_channels];
1480 vorbis_mapping *mapping;
1481 float *ch_res_ptr = vc->channel_residues;
1482 float *ch_floor_ptr = vc->channel_floors;
1483 uint_fast8_t res_chan[vc->audio_channels];
1484 uint_fast8_t res_num = 0;
1485 int_fast16_t retlen = 0;
1486 float fadd_bias = vc->add_bias;
1488 if (get_bits1(gb)) {
1489 av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1490 return -1; // packet type not audio
1493 if (vc->mode_count == 1) {
1496 mode_number = get_bits(gb, ilog(vc->mode_count-1));
1498 if (mode_number >= vc->mode_count) {
1499 av_log(vc->avccontext, AV_LOG_ERROR, "mode number %d out of range.\n", mode_number);
1502 vc->mode_number = mode_number;
1503 mapping = &vc->mappings[vc->modes[mode_number].mapping];
1505 AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1507 blockflag = vc->modes[mode_number].blockflag;
1508 blocksize = vc->blocksize[blockflag];
1510 skip_bits(gb, 2); // previous_window, next_window
1512 memset(ch_res_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1513 memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
1517 for (i = 0; i < vc->audio_channels; ++i) {
1518 vorbis_floor *floor;
1519 if (mapping->submaps > 1) {
1520 floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
1522 floor = &vc->floors[mapping->submap_floor[0]];
1525 no_residue[i] = floor->decode(vc, &floor->data, ch_floor_ptr);
1526 ch_floor_ptr += blocksize / 2;
1529 // Nonzero vector propagate
1531 for (i = mapping->coupling_steps - 1; i >= 0; --i) {
1532 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1533 no_residue[mapping->magnitude[i]] = 0;
1534 no_residue[mapping->angle[i]] = 0;
1540 for (i = 0; i < mapping->submaps; ++i) {
1541 vorbis_residue *residue;
1542 uint_fast8_t ch = 0;
1544 for (j = 0; j < vc->audio_channels; ++j) {
1545 if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
1546 res_chan[j] = res_num;
1547 if (no_residue[j]) {
1548 do_not_decode[ch] = 1;
1550 do_not_decode[ch] = 0;
1556 residue = &vc->residues[mapping->submap_residue[i]];
1557 vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1559 ch_res_ptr += ch * blocksize / 2;
1564 for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
1567 mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
1568 ang = vc->channel_residues+res_chan[mapping->angle[i]] * blocksize / 2;
1569 vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
1574 for (j = vc->audio_channels-1;j >= 0; j--) {
1575 ch_floor_ptr = vc->channel_floors + j * blocksize / 2;
1576 ch_res_ptr = vc->channel_residues + res_chan[j] * blocksize / 2;
1577 vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize / 2);
1578 ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);
1581 // Overlap/add, save data for next overlapping FPMATH
1583 retlen = (blocksize + vc->blocksize[previous_window]) / 4;
1584 for (j = 0; j < vc->audio_channels; j++) {
1585 uint_fast16_t bs0 = vc->blocksize[0];
1586 uint_fast16_t bs1 = vc->blocksize[1];
1587 float *residue = vc->channel_residues + res_chan[j] * blocksize / 2;
1588 float *saved = vc->saved + j * bs1 / 4;
1589 float *ret = vc->channel_floors + j * retlen;
1590 float *buf = residue;
1591 const float *win = vc->win[blockflag & previous_window];
1593 if (blockflag == previous_window) {
1594 vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize / 4);
1595 } else if (blockflag > previous_window) {
1596 vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0 / 4);
1597 copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
1599 copy_normalize(ret, saved, (bs1 - bs0) / 4, vc->exp_bias, fadd_bias);
1600 vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, fadd_bias, bs0 / 4);
1602 memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
1605 vc->previous_window = blockflag;
1609 // Return the decoded audio packet through the standard api
1611 static int vorbis_decode_frame(AVCodecContext *avccontext,
1612 void *data, int *data_size,
1615 const uint8_t *buf = avpkt->data;
1616 int buf_size = avpkt->size;
1617 vorbis_context *vc = avccontext->priv_data ;
1618 GetBitContext *gb = &(vc->gb);
1619 const float *channel_ptrs[vc->audio_channels];
1627 AV_DEBUG("packet length %d \n", buf_size);
1629 init_get_bits(gb, buf, buf_size*8);
1631 len = vorbis_parse_audio_packet(vc);
1638 if (!vc->first_frame) {
1639 vc->first_frame = 1;
1644 AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1646 for (i = 0; i < vc->audio_channels; i++)
1647 channel_ptrs[i] = vc->channel_floors + i * len;
1648 vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);
1649 *data_size = len * 2 * vc->audio_channels;
1656 static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
1658 vorbis_context *vc = avccontext->priv_data;
1665 AVCodec vorbis_decoder = {
1669 sizeof(vorbis_context),
1672 vorbis_decode_close,
1673 vorbis_decode_frame,
1674 .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),