4 * @author Denes Balatoni ( dbalatoni programozo hu )
11 #define ALT_BITSTREAM_READER_LE
13 #include "bitstream.h"
19 #define V_MAX_VLCS (1<<16)
27 /* Helper functions */
30 * reads 0-32 bits when using the ALT_BITSTREAM_READER_LE bitstream reader
32 unsigned int get_bits_long_le(GetBitContext *s, int n){
33 if(n<=17) return get_bits(s, n);
35 int ret= get_bits(s, 16);
36 return ret | (get_bits(s, n-16) << 16);
40 static unsigned int ilog(unsigned int i) { // unfortunatelly av_log2 uses different rounding
49 static unsigned int nth_root(unsigned int x, unsigned int n) { // x^(1/n)
50 unsigned int ret=0, i, j;
54 for(i=0,j=ret;i<n-1;i++) j*=ret;
60 static float vorbisfloat2float(uint_fast32_t val) {
61 double mant=val&0x1fffff;
62 long exp=(val&0x7fe00000L)>>21;
63 if (val&0x80000000) mant=-mant;
64 return(ldexp(mant, exp-20-768));
68 // Generate vlc codes from vorbis huffman code lengths
70 static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) {
71 uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
72 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
81 for(p=0;(bits[p]==0) && (p<num);++p);
83 // av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");
88 for(i=0;i<bits[p];++i) {
89 exit_at_level[i+1]=1<<i;
93 av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);
94 init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
95 for(i=0;i<bits[p];++i) {
96 av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
98 av_log(vc->avccontext, AV_LOG_INFO, "\n");
104 if (bits[p]==0) continue;
105 // find corresponding exit(node which the tree can grow further from)
106 for(i=bits[p];i>0;--i) {
107 if (exit_at_level[i]) break;
109 if (!i) return 1; // overspecified tree
110 code=exit_at_level[i];
112 // construct code (append 0s to end) and introduce new exits
113 for(j=i+1;j<=bits[p];++j) {
114 exit_at_level[j]=code+(1<<(j-1));
119 av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);
120 init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);
121 for(i=0;i<bits[p];++i) {
122 av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");
124 av_log(vc->avccontext, AV_LOG_INFO, "\n");
129 //FIXME no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
134 // Free all allocated memory -----------------------------------------
136 static void vorbis_free(vorbis_context *vc) {
139 av_freep(&vc->channel_residues);
140 av_freep(&vc->channel_floors);
141 av_freep(&vc->saved);
144 av_freep(&vc->residues);
145 av_freep(&vc->modes);
147 ff_mdct_end(&vc->mdct0);
148 ff_mdct_end(&vc->mdct1);
150 for(i=0;i<vc->codebook_count;++i) {
151 av_free(vc->codebooks[i].codevectors);
152 free_vlc(&vc->codebooks[i].vlc);
154 av_freep(&vc->codebooks);
156 for(i=0;i<vc->floor_count;++i) {
157 av_free(vc->floors[i].x_list);
158 av_free(vc->floors[i].x_list_order);
159 av_free(vc->floors[i].low_neighbour);
160 av_free(vc->floors[i].high_neighbour);
162 av_freep(&vc->floors);
164 for(i=0;i<vc->mapping_count;++i) {
165 av_free(vc->mappings[i].magnitude);
166 av_free(vc->mappings[i].angle);
167 av_free(vc->mappings[i].mux);
169 av_freep(&vc->mappings);
172 // Parse setup header -------------------------------------------------
174 // Process codebooks part
176 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
178 GetBitContext *gb=&vc->gb;
180 vc->codebook_count=get_bits(gb,8)+1;
182 AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
184 vc->codebooks=(vorbis_codebook *)av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
186 for(cb=0;cb<vc->codebook_count;++cb) {
187 vorbis_codebook *codebook_setup=&vc->codebooks[cb];
188 uint_fast8_t ordered;
189 uint_fast32_t t, used_entries=0;
190 uint_fast32_t entries;
191 uint_fast8_t tmp_vlc_bits[V_MAX_VLCS];
192 uint_fast32_t tmp_vlc_codes[V_MAX_VLCS];
194 // memset(tmp_vlc_bits, 0, sizeof(tmp_vlc_bits));
196 AV_DEBUG(" %d. Codebook \n", cb);
198 if (get_bits(gb, 24)!=0x564342) {
199 av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook setup data corrupt. \n", cb);
203 codebook_setup->dimensions=get_bits(gb, 16);
204 if (codebook_setup->dimensions>16) {
205 av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook's dimension is too large (%d). \n", cb, codebook_setup->dimensions);
208 entries=get_bits(gb, 24);
209 if (entries>V_MAX_VLCS) {
210 av_log(vc->avccontext, AV_LOG_ERROR, " %d. Codebook has too many entries (%d). \n", cb, entries);
214 ordered=get_bits1(gb);
216 AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
221 uint_fast8_t sparse=get_bits1(gb);
223 AV_DEBUG(" not ordered \n");
226 AV_DEBUG(" sparse \n");
229 for(ce=0;ce<entries;++ce) {
232 tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
235 else tmp_vlc_bits[ce]=0;
238 AV_DEBUG(" not sparse \n");
240 used_entries=entries;
241 for(ce=0;ce<entries;++ce) {
242 tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
246 uint_fast16_t current_entry=0;
247 uint_fast8_t current_length=get_bits(gb, 5)+1;
249 AV_DEBUG(" ordered, current length: %d \n", current_length); //FIXME
251 used_entries=entries;
252 for(;current_entry<used_entries;++current_length) {
253 uint_fast16_t i, number;
255 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
257 number=get_bits(gb, ilog(entries - current_entry));
259 AV_DEBUG(" number: %d \n", number);
261 for(i=current_entry;i<number+current_entry;++i) {
262 if (i<used_entries) tmp_vlc_bits[i]=current_length;
265 current_entry+=number;
267 if (current_entry>used_entries) {
268 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
273 codebook_setup->lookup_type=get_bits(gb, 4);
275 AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
277 // If the codebook is used for (inverse) VQ, calculate codevectors.
279 if (codebook_setup->lookup_type==1) {
280 uint_fast16_t i, j, k;
281 uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);
282 uint_fast16_t codebook_multiplicands[codebook_lookup_values];
284 float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));
285 float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));
286 uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
287 uint_fast8_t codebook_sequence_p=get_bits1(gb);
289 AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
290 AV_DEBUG(" delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
292 for(i=0;i<codebook_lookup_values;++i) {
293 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
295 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
296 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
299 // Weed out unused vlcs and build codevector vector
300 codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));
301 for(j=0, i=0;i<entries;++i) {
302 uint_fast8_t dim=codebook_setup->dimensions;
304 if (tmp_vlc_bits[i]) {
306 uint_fast32_t lookup_offset=i;
309 av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
313 uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
314 codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
315 if (codebook_sequence_p) {
316 last=codebook_setup->codevectors[j*dim+k];
318 lookup_offset/=codebook_lookup_values;
320 tmp_vlc_bits[j]=tmp_vlc_bits[i];
323 av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
325 av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
327 av_log(vc->avccontext, AV_LOG_INFO, "\n");
333 if (j!=used_entries) {
334 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
337 entries=used_entries;
339 else if (codebook_setup->lookup_type>=2) {
340 av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
344 // Initialize VLC table
345 if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {
346 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
349 codebook_setup->maxdepth=0;
350 for(t=0;t<entries;++t)
351 if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
353 codebook_setup->maxdepth=(codebook_setup->maxdepth+V_NB_BITS-1)/V_NB_BITS;
355 if (init_vlc(&codebook_setup->vlc, V_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)) {
356 av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
363 // Process time domain transforms part (unused in Vorbis I)
365 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
366 GetBitContext *gb=&vc->gb;
368 uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
370 for(i=0;i<vorbis_time_count;++i) {
371 uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
373 AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
375 if (vorbis_tdtransform) {
376 av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
383 // Process floors part - only floor type 1 is supported
385 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
386 GetBitContext *gb=&vc->gb;
389 vc->floor_count=get_bits(gb, 6)+1;
391 vc->floors=(vorbis_floor *)av_mallocz(vc->floor_count * sizeof(vorbis_floor));
393 for (i=0;i<vc->floor_count;++i) {
394 vorbis_floor *floor_setup=&vc->floors[i];
396 floor_setup->floor_type=get_bits(gb, 16);
398 AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
400 if (floor_setup->floor_type==1) {
401 uint_fast8_t maximum_class=0;
402 uint_fast8_t rangebits;
403 uint_fast16_t floor1_values=2;
405 floor_setup->partitions=get_bits(gb, 5);
407 AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->partitions);
409 for(j=0;j<floor_setup->partitions;++j) {
410 floor_setup->partition_class[j]=get_bits(gb, 4);
411 if (floor_setup->partition_class[j]>maximum_class) maximum_class=floor_setup->partition_class[j];
413 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->partition_class[j]);
417 AV_DEBUG(" maximum class %d \n", maximum_class);
419 floor_setup->maximum_class=maximum_class;
421 for(j=0;j<=maximum_class;++j) {
422 floor_setup->class_dimensions[j]=get_bits(gb, 3)+1;
423 floor_setup->class_subclasses[j]=get_bits(gb, 2);
425 AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->class_dimensions[j], floor_setup->class_subclasses[j]);
427 if (floor_setup->class_subclasses[j]) {
428 floor_setup->class_masterbook[j]=get_bits(gb, 8);
430 AV_DEBUG(" masterbook: %d \n", floor_setup->class_masterbook[j]);
433 for(k=0;k<(1<<floor_setup->class_subclasses[j]);++k) {
434 floor_setup->subclass_books[j][k]=get_bits(gb, 8)-1;
436 AV_DEBUG(" book %d. : %d \n", k, floor_setup->subclass_books[j][k]);
440 floor_setup->multiplier=get_bits(gb, 2)+1;
441 floor_setup->x_list_dim=2;
443 for(j=0;j<floor_setup->partitions;++j) {
444 floor_setup->x_list_dim+=floor_setup->class_dimensions[floor_setup->partition_class[j]];
447 floor_setup->x_list=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
448 floor_setup->x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
449 floor_setup->low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
450 floor_setup->high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));
453 rangebits=get_bits(gb, 4);
454 floor_setup->x_list[0] = 0;
455 floor_setup->x_list[1] = (1<<rangebits);
457 for(j=0;j<floor_setup->partitions;++j) {
458 for(k=0;k<floor_setup->class_dimensions[floor_setup->partition_class[j]];++k,++floor1_values) {
459 floor_setup->x_list[floor1_values]=get_bits(gb, rangebits);
461 AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->x_list[floor1_values]);
465 // Precalculate order of x coordinates - needed for decode
467 for(k=0;k<floor_setup->x_list_dim;++k) {
468 floor_setup->x_list_order[k]=k;
471 for(k=0;k<floor_setup->x_list_dim-1;++k) { // FIXME optimize sorting ?
472 for(j=k+1;j<floor_setup->x_list_dim;++j) {
473 if(floor_setup->x_list[floor_setup->x_list_order[k]]>floor_setup->x_list[floor_setup->x_list_order[j]]) {
474 uint_fast16_t tmp=floor_setup->x_list_order[k];
475 floor_setup->x_list_order[k]=floor_setup->x_list_order[j];
476 floor_setup->x_list_order[j]=tmp;
481 // Precalculate low and high neighbours
483 for(k=2;k<floor_setup->x_list_dim;++k) {
484 floor_setup->low_neighbour[k]=0;
485 floor_setup->high_neighbour[k]=1; // correct according to SPEC requirements
488 if ((floor_setup->x_list[j]<floor_setup->x_list[k]) &&
489 (floor_setup->x_list[j]>floor_setup->x_list[floor_setup->low_neighbour[k]])) {
490 floor_setup->low_neighbour[k]=j;
492 if ((floor_setup->x_list[j]>floor_setup->x_list[k]) &&
493 (floor_setup->x_list[j]<floor_setup->x_list[floor_setup->high_neighbour[k]])) {
494 floor_setup->high_neighbour[k]=j;
500 av_log(vc->avccontext, AV_LOG_ERROR, "Only floor type 1 supported. \n");
507 // Process residues part
509 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
510 GetBitContext *gb=&vc->gb;
511 uint_fast8_t i, j, k;
513 vc->residue_count=get_bits(gb, 6)+1;
514 vc->residues=(vorbis_residue *)av_mallocz(vc->residue_count * sizeof(vorbis_residue));
516 AV_DEBUG(" There are %d residues. \n", vc->residue_count);
518 for(i=0;i<vc->residue_count;++i) {
519 vorbis_residue *res_setup=&vc->residues[i];
520 uint_fast8_t cascade[64];
521 uint_fast8_t high_bits;
522 uint_fast8_t low_bits;
524 res_setup->type=get_bits(gb, 16);
526 AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
528 res_setup->begin=get_bits(gb, 24);
529 res_setup->end=get_bits(gb, 24);
530 res_setup->partition_size=get_bits(gb, 24)+1;
531 res_setup->classifications=get_bits(gb, 6)+1;
532 res_setup->classbook=get_bits(gb, 8);
534 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,
535 res_setup->classifications, res_setup->classbook);
537 for(j=0;j<res_setup->classifications;++j) {
539 low_bits=get_bits(gb, 3);
541 high_bits=get_bits(gb, 5);
543 cascade[j]=(high_bits<<3)+low_bits;
545 AV_DEBUG(" %d class casscade depth: %d \n", j, ilog(cascade[j]));
548 res_setup->maxpass=0;
549 for(j=0;j<res_setup->classifications;++j) {
551 if (cascade[j]&(1<<k)) {
552 res_setup->books[j][k]=get_bits(gb, 8);
554 AV_DEBUG(" %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
556 if (k>res_setup->maxpass) {
557 res_setup->maxpass=k;
560 res_setup->books[j][k]=-1;
568 // Process mappings part
570 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
571 GetBitContext *gb=&vc->gb;
574 vc->mapping_count=get_bits(gb, 6)+1;
575 vc->mappings=(vorbis_mapping *)av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
577 AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
579 for(i=0;i<vc->mapping_count;++i) {
580 vorbis_mapping *mapping_setup=&vc->mappings[i];
582 if (get_bits(gb, 16)) {
583 av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
587 mapping_setup->submaps=get_bits(gb, 4)+1;
589 mapping_setup->submaps=1;
593 mapping_setup->coupling_steps=get_bits(gb, 8)+1;
594 mapping_setup->magnitude=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
595 mapping_setup->angle=(uint_fast8_t *)av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
596 for(j=0;j<mapping_setup->coupling_steps;++j) {
597 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
598 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
599 // FIXME: sanity checks
602 mapping_setup->coupling_steps=0;
605 AV_DEBUG(" %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
607 if(get_bits(gb, 2)) {
608 av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
609 return 1; // following spec.
612 if (mapping_setup->submaps>1) {
613 mapping_setup->mux=(uint_fast8_t *)av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
614 for(j=0;j<vc->audio_channels;++j) {
615 mapping_setup->mux[j]=get_bits(gb, 4);
619 for(j=0;j<mapping_setup->submaps;++j) {
620 get_bits(gb, 8); // FIXME check?
621 mapping_setup->submap_floor[j]=get_bits(gb, 8);
622 mapping_setup->submap_residue[j]=get_bits(gb, 8);
624 AV_DEBUG(" %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
630 // Process modes part
632 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
633 GetBitContext *gb=&vc->gb;
636 vc->mode_count=get_bits(gb, 6)+1;
637 vc->modes=(vorbis_mode *)av_mallocz(vc->mode_count * sizeof(vorbis_mode));
639 AV_DEBUG(" There are %d modes.\n", vc->mode_count);
641 for(i=0;i<vc->mode_count;++i) {
642 vorbis_mode *mode_setup=&vc->modes[i];
644 mode_setup->blockflag=get_bits(gb, 1);
645 mode_setup->windowtype=get_bits(gb, 16); //FIXME check
646 mode_setup->transformtype=get_bits(gb, 16); //FIXME check
647 mode_setup->mapping=get_bits(gb, 8); //FIXME check
649 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);
654 // Process the whole setup header using the functions above
656 static int vorbis_parse_setup_hdr(vorbis_context *vc) {
657 GetBitContext *gb=&vc->gb;
659 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
660 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
661 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
662 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
666 if (vorbis_parse_setup_hdr_codebooks(vc)) {
667 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
670 if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
671 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
674 if (vorbis_parse_setup_hdr_floors(vc)) {
675 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
678 if (vorbis_parse_setup_hdr_residues(vc)) {
679 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
682 if (vorbis_parse_setup_hdr_mappings(vc)) {
683 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
686 if (vorbis_parse_setup_hdr_modes(vc)) {
687 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
690 if (!get_bits1(gb)) {
691 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
692 return 8; // framing flag bit unset error
698 // Process the identification header
700 static int vorbis_parse_id_hdr(vorbis_context *vc){
701 GetBitContext *gb=&vc->gb;
702 uint_fast8_t bl0, bl1;
703 const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };
705 if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
706 (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
707 (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
708 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
712 vc->version=get_bits_long_le(gb, 32); //FIXME check 0
713 vc->audio_channels=get_bits(gb, 8); //FIXME check >0
714 vc->audio_samplerate=get_bits_long_le(gb, 32); //FIXME check >0
715 vc->bitrate_maximum=get_bits_long_le(gb, 32);
716 vc->bitrate_nominal=get_bits_long_le(gb, 32);
717 vc->bitrate_minimum=get_bits_long_le(gb, 32);
720 vc->blocksize_0=(1<<bl0);
721 vc->blocksize_1=(1<<bl1);
722 if (bl0>13 || bl0<6 || bl1>13 || bl1<6) {
723 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
726 vc->swin=vwin[bl0-6];
727 vc->lwin=vwin[bl1-6];
729 if ((get_bits1(gb)) == 0) {
730 av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
734 vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
735 vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
736 vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
737 vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));
740 ff_mdct_init(&vc->mdct0, bl0, 1);
741 ff_mdct_init(&vc->mdct1, bl1, 1);
743 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 ",
744 vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);
748 for(i=0;i<BLK/2;++i) {
749 vc->swin[i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358)));
756 // Process the extradata using the functions above (identification header, setup header)
758 static int vorbis_decode_init(AVCodecContext *avccontext) {
759 vorbis_context *vc = avccontext->priv_data ;
760 uint8_t *headers = avccontext->extradata;
761 int headers_len=avccontext->extradata_size;
763 GetBitContext *gb = &(vc->gb);
766 vc->avccontext = avccontext;
768 if (!headers_len || headers[0]!=2) {
769 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
773 for(j=1,i=0;i<2;++i, ++j) {
775 while(j<headers_len && headers[j]==0xff) {
779 if (j>=headers_len) {
780 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
783 header_len[i]+=headers[j];
785 header_len[2]=headers_len-header_len[0]-header_len[1]-j;
788 init_get_bits(gb, headers, header_len[0]*8);
789 hdr_type=get_bits(gb, 8);
791 av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
794 if (vorbis_parse_id_hdr(vc)) {
795 av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
800 init_get_bits(gb, headers+header_len[0]+header_len[1], header_len[2]*8);
801 hdr_type=get_bits(gb, 8);
803 av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
806 if (vorbis_parse_setup_hdr(vc)) {
807 av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
812 avccontext->channels = vc->audio_channels;
813 avccontext->sample_rate = vc->audio_samplerate;
818 // Decode audiopackets -------------------------------------------------
820 // Read and decode floor (type 1 only)
822 static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor *vf, float *vec) {
823 GetBitContext *gb=&vc->gb;
824 uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
825 uint_fast16_t range=range_v[vf->multiplier-1];
826 uint_fast16_t floor1_Y[vf->x_list_dim];
827 uint_fast16_t floor1_Y_final[vf->x_list_dim];
828 uint_fast8_t floor1_flag[vf->x_list_dim];
835 uint_fast16_t offset;
837 uint_fast16_t *floor_x_sort=vf->x_list_order;
838 /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
839 int_fast16_t dy, err;
840 uint_fast16_t lx,hx, ly, hy=0;
843 if (!get_bits1(gb)) return 1; // silence
845 // Read values (or differences) for the floor's points
847 floor1_Y[0]=get_bits(gb, ilog(range-1));
848 floor1_Y[1]=get_bits(gb, ilog(range-1));
850 AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
853 for(i=0;i<vf->partitions;++i) {
854 class_=vf->partition_class[i];
855 cdim=vf->class_dimensions[class_];
856 cbits=vf->class_subclasses[class_];
860 AV_DEBUG("Cbits %d \n", cbits);
862 if (cbits) { // this reads all subclasses for this partition's class
863 cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
864 V_NB_BITS, vc->codebooks[vf->class_masterbook[class_]].maxdepth);
867 for(j=0;j<cdim;++j) {
868 book=vf->subclass_books[class_][cval & csub];
870 AV_DEBUG("book %d Cbits %d cval %d bits:%d \n", book, cbits, cval, get_bits_count(gb));
874 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
875 V_NB_BITS, vc->codebooks[book].maxdepth);
877 floor1_Y[offset+j]=0;
880 AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);
885 // Amplitude calculation from the differences
889 floor1_Y_final[0]=floor1_Y[0];
890 floor1_Y_final[1]=floor1_Y[1];
892 for(i=2;i<vf->x_list_dim;++i) {
893 uint_fast16_t val, highroom, lowroom, room;
894 uint_fast16_t high_neigh_offs;
895 uint_fast16_t low_neigh_offs;
897 low_neigh_offs=vf->low_neighbour[i];
898 high_neigh_offs=vf->high_neighbour[i];
899 dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs]; // render_point begin
900 adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];
902 err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);
905 predicted=floor1_Y_final[low_neigh_offs]-off;
907 predicted=floor1_Y_final[low_neigh_offs]+off;
908 } // render_point end
911 highroom=range-predicted;
913 if (highroom < lowroom) {
916 room=lowroom*2; // SPEC mispelling
919 floor1_flag[low_neigh_offs]=1;
920 floor1_flag[high_neigh_offs]=1;
923 if (highroom > lowroom) {
924 floor1_Y_final[i]=val-lowroom+predicted;
926 floor1_Y_final[i]=predicted-val+highroom-1;
930 floor1_Y_final[i]=predicted-(val+1)/2;
932 floor1_Y_final[i]=predicted+val/2;
937 floor1_Y_final[i]=predicted;
940 AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);
943 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
947 ly=floor1_Y_final[0]*vf->multiplier; // conforms to SPEC
949 vec[0]=floor1_inverse_db_table[ly];
951 for(i=1;i<vf->x_list_dim;++i) {
952 AV_DEBUG(" Looking at post %d \n", i);
954 if (floor1_flag[floor_x_sort[i]]) { // SPEC mispelled
955 int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2 base = 2blablabla ?????
957 hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;
958 hx=vf->x_list[floor_x_sort[i]];
962 ady= (dy<0) ? -dy:dy;//ABS(dy);
965 AV_DEBUG(" dy %d adx %d base %d = %d \n", dy, adx, base, dy/adx);
975 ady=ady-(base<0 ? -base : base)*adx;
976 vec[x]=floor1_inverse_db_table[y];
978 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
980 for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {
988 vec[x]=floor1_inverse_db_table[y];
990 AV_DEBUG(" vec[ %d ] = %d \n", x, y);
993 /* for(j=1;j<hx-lx+1;++j) { // iterating render_point
996 ady= dy<0 ? -dy : dy;
1004 if (lx+j < vf->x_list[1]) {
1005 vec[lx+j]=floor1_inverse_db_table[predicted];
1014 if (hx<vf->x_list[1]) {
1015 for(i=hx;i<vf->x_list[1];++i) {
1016 vec[i]=floor1_inverse_db_table[hy];
1020 AV_DEBUG(" Floor decoded\n");
1025 // Read and decode residue
1027 static int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen) {
1028 GetBitContext *gb=&vc->gb;
1029 uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
1030 uint_fast16_t n_to_read=vr->end-vr->begin;
1031 uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
1032 uint_fast8_t classifs[ptns_to_read];
1034 uint_fast8_t ch_used;
1040 do_not_decode[0]&=do_not_decode[j]; // FIXME - clobbering input
1042 if (do_not_decode[0]) return 0;
1048 AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d cpc %d \n", ch, c_p_c);
1050 for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
1051 uint_fast16_t voffset;
1052 uint_fast16_t partition_count;
1053 uint_fast16_t j_times_ptns_to_read;
1056 for(partition_count=0;partition_count<ptns_to_read;) { // SPEC error
1058 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1059 if (!do_not_decode[j]) {
1060 uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
1061 V_NB_BITS, vc->codebooks[vr->classbook].maxdepth);
1063 AV_DEBUG("Classword: %d \n", temp);
1065 for(i=0;i<c_p_c;++i) {
1066 uint_fast32_t temp2;
1068 temp2=temp/vr->classifications;
1069 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
1073 j_times_ptns_to_read+=ptns_to_read;
1076 for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
1077 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
1078 uint_fast16_t voffs;
1080 if (!do_not_decode[j]) {
1081 uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
1082 int_fast16_t vqbook=vr->books[vqclass][pass];
1085 uint_fast16_t coffs;
1088 uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;
1090 voffs=voffset+j*vlen;
1091 for(k=0;k<step;++k) {
1092 coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1093 V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1094 for(l=0;l<vc->codebooks[vqbook].dimensions;++l) {
1095 vec[voffs+k+l*step]+=vc->codebooks[vqbook].codevectors[coffs+l]; // FPMATH
1099 else if (vr->type==1) {
1100 voffs=voffset+j*vlen;
1101 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1102 coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1103 V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1104 for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1105 vec[voffs]+=vc->codebooks[vqbook].codevectors[coffs+l]; // FPMATH
1107 AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d \n", pass, voffs, vec[voffs], vc->codebooks[vqbook].codevectors[coffs+l], coffs);
1111 else if (vr->type==2 && ch==2) { // most frequent case optimized
1114 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1115 coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1116 V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1117 for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1118 vec[(voffs>>1)+((voffs&1) ? vlen : 0)]+=vc->codebooks[vqbook].codevectors[coffs+l]; // FPMATH
1120 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], vc->codebooks[vqbook].codevectors[coffs+l], coffs, l);
1125 else if (vr->type==2) {
1128 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {
1129 coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,
1130 V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;
1131 for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {
1132 vec[voffs/ch+(voffs%ch)*vlen]+=vc->codebooks[vqbook].codevectors[coffs+l]; // FPMATH FIXME use if and counter instead of / and %
1134 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], vc->codebooks[vqbook].codevectors[coffs+l], coffs, l);
1138 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
1142 j_times_ptns_to_read+=ptns_to_read;
1146 voffset+=vr->partition_size;
1153 // Decode the audio packet using the functions above
1155 static int vorbis_parse_audio_packet(vorbis_context *vc) {
1156 GetBitContext *gb=&vc->gb;
1158 uint_fast8_t previous_window=0,next_window=0;
1159 uint_fast8_t mode_number;
1160 uint_fast16_t blocksize;
1162 uint_fast8_t no_residue[vc->audio_channels];
1163 uint_fast8_t do_not_decode[vc->audio_channels];
1164 vorbis_mapping *mapping;
1165 float *ch_res_ptr=vc->channel_residues;
1166 float *ch_floor_ptr=vc->channel_floors;
1167 uint_fast8_t res_chan[vc->audio_channels];
1168 uint_fast8_t res_num=0;
1169 int_fast16_t retlen=0;
1170 uint_fast16_t saved_start=0;
1172 if (get_bits1(gb)) {
1173 av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
1174 return -1; // packet type not audio
1177 mode_number=get_bits(gb, ilog(vc->mode_count-1));
1178 mapping=&vc->mappings[vc->modes[mode_number].mapping];
1180 AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
1182 if (vc->modes[mode_number].blockflag) {
1183 previous_window=get_bits1(gb);
1184 next_window=get_bits1(gb);
1187 blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;
1188 memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1189 memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?
1193 for(i=0;i<vc->audio_channels;++i) {
1194 vorbis_floor *floor;
1195 if (mapping->submaps>1) {
1196 floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
1198 floor=&vc->floors[mapping->submap_floor[0]];
1201 no_residue[i]=vorbis_floor1_decode(vc, floor, ch_floor_ptr);
1202 ch_floor_ptr+=blocksize/2;
1205 // Nonzero vector propagate
1207 for(i=mapping->coupling_steps-1;i>=0;--i) {
1208 if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
1209 no_residue[mapping->magnitude[i]]=0;
1210 no_residue[mapping->angle[i]]=0;
1216 for(i=0;i<mapping->submaps;++i) {
1217 vorbis_residue *residue;
1220 for(j=0;j<vc->audio_channels;++j) {
1221 if ((mapping->submaps==1) || (i=mapping->mux[j])) {
1222 res_chan[j]=res_num;
1223 if (no_residue[j]) {
1224 do_not_decode[ch]=1;
1226 do_not_decode[ch]=0;
1232 residue=&vc->residues[mapping->submap_residue[i]];
1233 vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
1235 ch_res_ptr+=ch*blocksize/2;
1240 for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
1243 mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
1244 ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
1245 for(j=0;j<blocksize/2;++j) {
1249 ang[j]=mag[j]-ang[j];
1269 for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {
1270 ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
1272 for(i=0;i<blocksize/2;++i) {
1273 ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH
1277 // MDCT, overlap/add, save data for next overlapping FPMATH
1279 for(j=0;j<vc->audio_channels;++j) {
1280 uint_fast8_t step=vc->audio_channels;
1282 float *saved=vc->saved+j*vc->blocksize_1/2;
1284 const float *lwin=vc->lwin;
1285 const float *swin=vc->swin;
1286 float buf[blocksize];
1287 float buf_tmp[blocksize];
1289 ch_floor_ptr=vc->channel_floors+j*blocksize/2;
1291 saved_start=vc->saved_start;
1293 ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);
1295 if (vc->modes[mode_number].blockflag) {
1297 if (previous_window) {
1298 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {
1299 ret[k]=saved[i]+buf[i]*lwin[i];
1301 retlen=vc->blocksize_1/2;
1303 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {
1304 ret[k]=saved[i]+buf[(vc->blocksize_1-vc->blocksize_0)/4+i]*swin[i];
1306 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {
1307 ret[k]=buf[vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4+i];
1309 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;
1313 for(i=0;i<vc->blocksize_1/2;++i) {
1314 saved[i]=buf[vc->blocksize_1/2+i]*lwin[vc->blocksize_1/2-1-i];
1318 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;
1319 for(i=0;i<saved_start;++i) {
1320 saved[i]=buf[vc->blocksize_1/2+i];
1322 for(i=0;i<vc->blocksize_0/2;++i) {
1323 saved[saved_start+i]=buf[vc->blocksize_1/2+saved_start+i]*swin[vc->blocksize_0/2-1-i];
1328 for(k=j, i=0;i<saved_start;++i, k+=step) {
1331 for(i=0;i<vc->blocksize_0/2;++i, k+=step) {
1332 ret[k]=saved[saved_start+i]+buf[i]*swin[i];
1334 retlen=saved_start+vc->blocksize_0/2;
1336 for(i=0;i<vc->blocksize_0/2;++i) {
1337 saved[i]=buf[vc->blocksize_0/2+i]*swin[vc->blocksize_0/2-1-i];
1342 vc->saved_start=saved_start;
1344 return retlen*vc->audio_channels;
1347 // Return the decoded audio packet through the standard api
1349 static int vorbis_decode_frame(AVCodecContext *avccontext,
1350 void *data, int *data_size,
1351 uint8_t *buf, int buf_size)
1353 vorbis_context *vc = avccontext->priv_data ;
1354 GetBitContext *gb = &(vc->gb);
1356 int_fast16_t i, len;
1362 AV_DEBUG("packet length %d \n", buf_size);
1364 init_get_bits(gb, buf, buf_size*8);
1366 len=vorbis_parse_audio_packet(vc);
1373 if (!vc->first_frame) {
1379 AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
1381 for(i=0;i<len;++i) {
1384 tmp=vc->ret[i]*32768;
1385 if (tmp>32767) tmp=32767;
1386 if (tmp<-32768) tmp=-32768;
1387 ((int16_t*)data)[i]=tmp;
1396 static int vorbis_decode_close(AVCodecContext *avccontext) {
1397 vorbis_context *vc = avccontext->priv_data;
1404 AVCodec vorbis_decoder = {
1408 sizeof(vorbis_context),
1411 vorbis_decode_close,
1412 vorbis_decode_frame,