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libavcodec/vorbis_dec.c

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00001 
00023 #undef V_DEBUG
00024 //#define V_DEBUG
00025 //#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)
00026 
00027 #include <math.h>
00028 
00029 #define ALT_BITSTREAM_READER_LE
00030 #include "avcodec.h"
00031 #include "bitstream.h"
00032 #include "dsputil.h"
00033 
00034 #include "vorbis.h"
00035 #include "xiph.h"
00036 
00037 #define V_NB_BITS 8
00038 #define V_NB_BITS2 11
00039 #define V_MAX_VLCS (1<<16)
00040 #define V_MAX_PARTITIONS (1<<20)
00041 
00042 #ifndef V_DEBUG
00043 #define AV_DEBUG(...)
00044 #endif
00045 
00046 #undef NDEBUG
00047 #include <assert.h>
00048 
00049 typedef struct {
00050     uint_fast8_t dimensions;
00051     uint_fast8_t lookup_type;
00052     uint_fast8_t maxdepth;
00053     VLC vlc;
00054     float *codevectors;
00055     unsigned int nb_bits;
00056 } vorbis_codebook;
00057 
00058 typedef union vorbis_floor_u vorbis_floor_data;
00059 typedef struct vorbis_floor0_s vorbis_floor0;
00060 typedef struct vorbis_floor1_s vorbis_floor1;
00061 struct vorbis_context_s;
00062 typedef
00063 int (* vorbis_floor_decode_func)
00064     (struct vorbis_context_s *, vorbis_floor_data *, float *);
00065 typedef struct {
00066     uint_fast8_t floor_type;
00067     vorbis_floor_decode_func decode;
00068     union vorbis_floor_u
00069     {
00070         struct vorbis_floor0_s
00071         {
00072             uint_fast8_t order;
00073             uint_fast16_t rate;
00074             uint_fast16_t bark_map_size;
00075             int_fast32_t * map[2];
00076             uint_fast32_t map_size[2];
00077             uint_fast8_t amplitude_bits;
00078             uint_fast8_t amplitude_offset;
00079             uint_fast8_t num_books;
00080             uint_fast8_t * book_list;
00081             float * lsp;
00082         } t0;
00083         struct vorbis_floor1_s
00084         {
00085             uint_fast8_t partitions;
00086             uint_fast8_t maximum_class;
00087             uint_fast8_t partition_class[32];
00088             uint_fast8_t class_dimensions[16];
00089             uint_fast8_t class_subclasses[16];
00090             uint_fast8_t class_masterbook[16];
00091             int_fast16_t subclass_books[16][8];
00092             uint_fast8_t multiplier;
00093             uint_fast16_t x_list_dim;
00094             vorbis_floor1_entry * list;
00095         } t1;
00096     } data;
00097 } vorbis_floor;
00098 
00099 typedef struct {
00100     uint_fast16_t type;
00101     uint_fast32_t begin;
00102     uint_fast32_t end;
00103     uint_fast32_t partition_size;
00104     uint_fast8_t classifications;
00105     uint_fast8_t classbook;
00106     int_fast16_t books[64][8];
00107     uint_fast8_t maxpass;
00108 } vorbis_residue;
00109 
00110 typedef struct {
00111     uint_fast8_t submaps;
00112     uint_fast16_t coupling_steps;
00113     uint_fast8_t *magnitude;
00114     uint_fast8_t *angle;
00115     uint_fast8_t *mux;
00116     uint_fast8_t submap_floor[16];
00117     uint_fast8_t submap_residue[16];
00118 } vorbis_mapping;
00119 
00120 typedef struct {
00121     uint_fast8_t blockflag;
00122     uint_fast16_t windowtype;
00123     uint_fast16_t transformtype;
00124     uint_fast8_t mapping;
00125 } vorbis_mode;
00126 
00127 typedef struct vorbis_context_s {
00128     AVCodecContext *avccontext;
00129     GetBitContext gb;
00130     DSPContext dsp;
00131 
00132     MDCTContext mdct[2];
00133     uint_fast8_t first_frame;
00134     uint_fast32_t version;
00135     uint_fast8_t audio_channels;
00136     uint_fast32_t audio_samplerate;
00137     uint_fast32_t bitrate_maximum;
00138     uint_fast32_t bitrate_nominal;
00139     uint_fast32_t bitrate_minimum;
00140     uint_fast32_t blocksize[2];
00141     const float * win[2];
00142     uint_fast16_t codebook_count;
00143     vorbis_codebook *codebooks;
00144     uint_fast8_t floor_count;
00145     vorbis_floor *floors;
00146     uint_fast8_t residue_count;
00147     vorbis_residue *residues;
00148     uint_fast8_t mapping_count;
00149     vorbis_mapping *mappings;
00150     uint_fast8_t mode_count;
00151     vorbis_mode *modes;
00152     uint_fast8_t mode_number; // mode number for the current packet
00153     uint_fast8_t previous_window;
00154     float *channel_residues;
00155     float *channel_floors;
00156     float *saved;
00157     uint_fast32_t add_bias; // for float->int conversion
00158     uint_fast32_t exp_bias;
00159 } vorbis_context;
00160 
00161 /* Helper functions */
00162 
00163 #define BARK(x) \
00164     (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))
00165 
00166 static float vorbisfloat2float(uint_fast32_t val) {
00167     double mant=val&0x1fffff;
00168     long exp=(val&0x7fe00000L)>>21;
00169     if (val&0x80000000) mant=-mant;
00170     return ldexp(mant, exp - 20 - 768);
00171 }
00172 
00173 
00174 // Free all allocated memory -----------------------------------------
00175 
00176 static void vorbis_free(vorbis_context *vc) {
00177     int_fast16_t i;
00178 
00179     av_freep(&vc->channel_residues);
00180     av_freep(&vc->channel_floors);
00181     av_freep(&vc->saved);
00182 
00183     av_freep(&vc->residues);
00184     av_freep(&vc->modes);
00185 
00186     ff_mdct_end(&vc->mdct[0]);
00187     ff_mdct_end(&vc->mdct[1]);
00188 
00189     for(i=0;i<vc->codebook_count;++i) {
00190         av_free(vc->codebooks[i].codevectors);
00191         free_vlc(&vc->codebooks[i].vlc);
00192     }
00193     av_freep(&vc->codebooks);
00194 
00195     for(i=0;i<vc->floor_count;++i) {
00196         if(vc->floors[i].floor_type==0) {
00197             av_free(vc->floors[i].data.t0.map[0]);
00198             av_free(vc->floors[i].data.t0.map[1]);
00199             av_free(vc->floors[i].data.t0.book_list);
00200             av_free(vc->floors[i].data.t0.lsp);
00201         }
00202         else {
00203             av_free(vc->floors[i].data.t1.list);
00204         }
00205     }
00206     av_freep(&vc->floors);
00207 
00208     for(i=0;i<vc->mapping_count;++i) {
00209         av_free(vc->mappings[i].magnitude);
00210         av_free(vc->mappings[i].angle);
00211         av_free(vc->mappings[i].mux);
00212     }
00213     av_freep(&vc->mappings);
00214 
00215     if(vc->exp_bias){
00216         av_freep(&vc->win[0]);
00217         av_freep(&vc->win[1]);
00218     }
00219 }
00220 
00221 // Parse setup header -------------------------------------------------
00222 
00223 // Process codebooks part
00224 
00225 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {
00226     uint_fast16_t cb;
00227     uint8_t *tmp_vlc_bits;
00228     uint32_t *tmp_vlc_codes;
00229     GetBitContext *gb=&vc->gb;
00230 
00231     vc->codebook_count=get_bits(gb,8)+1;
00232 
00233     AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);
00234 
00235     vc->codebooks=av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));
00236     tmp_vlc_bits =av_mallocz(V_MAX_VLCS * sizeof(uint8_t));
00237     tmp_vlc_codes=av_mallocz(V_MAX_VLCS * sizeof(uint32_t));
00238 
00239     for(cb=0;cb<vc->codebook_count;++cb) {
00240         vorbis_codebook *codebook_setup=&vc->codebooks[cb];
00241         uint_fast8_t ordered;
00242         uint_fast32_t t, used_entries=0;
00243         uint_fast32_t entries;
00244 
00245         AV_DEBUG(" %d. Codebook \n", cb);
00246 
00247         if (get_bits(gb, 24)!=0x564342) {
00248             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);
00249             goto error;
00250         }
00251 
00252         codebook_setup->dimensions=get_bits(gb, 16);
00253         if (codebook_setup->dimensions>16||codebook_setup->dimensions==0) {
00254             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions);
00255             goto error;
00256         }
00257         entries=get_bits(gb, 24);
00258         if (entries>V_MAX_VLCS) {
00259             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);
00260             goto error;
00261         }
00262 
00263         ordered=get_bits1(gb);
00264 
00265         AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);
00266 
00267         if (!ordered) {
00268             uint_fast16_t ce;
00269             uint_fast8_t flag;
00270             uint_fast8_t sparse=get_bits1(gb);
00271 
00272             AV_DEBUG(" not ordered \n");
00273 
00274             if (sparse) {
00275                 AV_DEBUG(" sparse \n");
00276 
00277                 used_entries=0;
00278                 for(ce=0;ce<entries;++ce) {
00279                     flag=get_bits1(gb);
00280                     if (flag) {
00281                         tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
00282                         ++used_entries;
00283                     }
00284                     else tmp_vlc_bits[ce]=0;
00285                 }
00286             } else {
00287                 AV_DEBUG(" not sparse \n");
00288 
00289                 used_entries=entries;
00290                 for(ce=0;ce<entries;++ce) {
00291                     tmp_vlc_bits[ce]=get_bits(gb, 5)+1;
00292                 }
00293             }
00294         } else {
00295             uint_fast16_t current_entry=0;
00296             uint_fast8_t current_length=get_bits(gb, 5)+1;
00297 
00298             AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME
00299 
00300             used_entries=entries;
00301             for(;current_entry<used_entries;++current_length) {
00302                 uint_fast16_t i, number;
00303 
00304                 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));
00305 
00306                 number=get_bits(gb, ilog(entries - current_entry));
00307 
00308                 AV_DEBUG(" number: %d \n", number);
00309 
00310                 for(i=current_entry;i<number+current_entry;++i) {
00311                     if (i<used_entries) tmp_vlc_bits[i]=current_length;
00312                 }
00313 
00314                 current_entry+=number;
00315             }
00316             if (current_entry>used_entries) {
00317                 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
00318                 goto error;
00319             }
00320         }
00321 
00322         codebook_setup->lookup_type=get_bits(gb, 4);
00323 
00324         AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );
00325 
00326 // If the codebook is used for (inverse) VQ, calculate codevectors.
00327 
00328         if (codebook_setup->lookup_type==1) {
00329             uint_fast16_t i, j, k;
00330             uint_fast16_t codebook_lookup_values=ff_vorbis_nth_root(entries, codebook_setup->dimensions);
00331             uint_fast16_t codebook_multiplicands[codebook_lookup_values];
00332 
00333             float codebook_minimum_value=vorbisfloat2float(get_bits_long(gb, 32));
00334             float codebook_delta_value=vorbisfloat2float(get_bits_long(gb, 32));
00335             uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;
00336             uint_fast8_t codebook_sequence_p=get_bits1(gb);
00337 
00338             AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);
00339             AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);
00340 
00341             for(i=0;i<codebook_lookup_values;++i) {
00342                 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);
00343 
00344                 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);
00345                 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);
00346             }
00347 
00348 // Weed out unused vlcs and build codevector vector
00349             codebook_setup->codevectors=used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;
00350             for(j=0, i=0;i<entries;++i) {
00351                 uint_fast8_t dim=codebook_setup->dimensions;
00352 
00353                 if (tmp_vlc_bits[i]) {
00354                     float last=0.0;
00355                     uint_fast32_t lookup_offset=i;
00356 
00357 #ifdef V_DEBUG
00358                     av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);
00359 #endif
00360 
00361                     for(k=0;k<dim;++k) {
00362                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;
00363                         codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;
00364                         if (codebook_sequence_p) {
00365                             last=codebook_setup->codevectors[j*dim+k];
00366                         }
00367                         lookup_offset/=codebook_lookup_values;
00368                     }
00369                     tmp_vlc_bits[j]=tmp_vlc_bits[i];
00370 
00371 #ifdef V_DEBUG
00372                     av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);
00373                     for(k=0;k<dim;++k) {
00374                         av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);
00375                     }
00376                     av_log(vc->avccontext, AV_LOG_INFO, "\n");
00377 #endif
00378 
00379                     ++j;
00380                 }
00381             }
00382             if (j!=used_entries) {
00383                 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
00384                 goto error;
00385             }
00386             entries=used_entries;
00387         }
00388         else if (codebook_setup->lookup_type>=2) {
00389             av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
00390             goto error;
00391         }
00392 
00393 // Initialize VLC table
00394         if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
00395             av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
00396             goto error;
00397         }
00398         codebook_setup->maxdepth=0;
00399         for(t=0;t<entries;++t)
00400             if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];
00401 
00402         if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;
00403         else                                       codebook_setup->nb_bits=V_NB_BITS;
00404 
00405         codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;
00406 
00407         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)) {
00408             av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
00409             goto error;
00410         }
00411     }
00412 
00413     av_free(tmp_vlc_bits);
00414     av_free(tmp_vlc_codes);
00415     return 0;
00416 
00417 // Error:
00418 error:
00419     av_free(tmp_vlc_bits);
00420     av_free(tmp_vlc_codes);
00421     return 1;
00422 }
00423 
00424 // Process time domain transforms part (unused in Vorbis I)
00425 
00426 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {
00427     GetBitContext *gb=&vc->gb;
00428     uint_fast8_t i;
00429     uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;
00430 
00431     for(i=0;i<vorbis_time_count;++i) {
00432         uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);
00433 
00434         AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);
00435 
00436         if (vorbis_tdtransform) {
00437             av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
00438             return 1;
00439         }
00440     }
00441     return 0;
00442 }
00443 
00444 // Process floors part
00445 
00446 static int vorbis_floor0_decode(vorbis_context *vc,
00447                                          vorbis_floor_data *vfu, float *vec);
00448 static void create_map( vorbis_context * vc, uint_fast8_t floor_number );
00449 static int vorbis_floor1_decode(vorbis_context *vc,
00450                                          vorbis_floor_data *vfu, float *vec);
00451 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {
00452     GetBitContext *gb=&vc->gb;
00453     int i,j,k;
00454 
00455     vc->floor_count=get_bits(gb, 6)+1;
00456 
00457     vc->floors=av_mallocz(vc->floor_count * sizeof(vorbis_floor));
00458 
00459     for (i=0;i<vc->floor_count;++i) {
00460         vorbis_floor *floor_setup=&vc->floors[i];
00461 
00462         floor_setup->floor_type=get_bits(gb, 16);
00463 
00464         AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);
00465 
00466         if (floor_setup->floor_type==1) {
00467             uint_fast8_t maximum_class=0;
00468             uint_fast8_t rangebits;
00469             uint_fast32_t rangemax;
00470             uint_fast16_t floor1_values=2;
00471 
00472             floor_setup->decode=vorbis_floor1_decode;
00473 
00474             floor_setup->data.t1.partitions=get_bits(gb, 5);
00475 
00476             AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);
00477 
00478             for(j=0;j<floor_setup->data.t1.partitions;++j) {
00479                 floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);
00480                 if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];
00481 
00482                 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);
00483 
00484             }
00485 
00486             AV_DEBUG(" maximum class %d \n", maximum_class);
00487 
00488             floor_setup->data.t1.maximum_class=maximum_class;
00489 
00490             for(j=0;j<=maximum_class;++j) {
00491                 floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;
00492                 floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);
00493 
00494                 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]);
00495 
00496                 if (floor_setup->data.t1.class_subclasses[j]) {
00497                     int bits=get_bits(gb, 8);
00498                     if (bits>=vc->codebook_count) {
00499                         av_log(vc->avccontext, AV_LOG_ERROR, "Masterbook index %d is out of range.\n", bits);
00500                         return 1;
00501                     }
00502                     floor_setup->data.t1.class_masterbook[j]=bits;
00503 
00504                     AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
00505                 }
00506 
00507                 for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {
00508                     int16_t bits=get_bits(gb, 8)-1;
00509                     if (bits!=-1 && bits>=vc->codebook_count) {
00510                         av_log(vc->avccontext, AV_LOG_ERROR, "Subclass book index %d is out of range.\n", bits);
00511                         return 1;
00512                     }
00513                     floor_setup->data.t1.subclass_books[j][k]=bits;
00514 
00515                     AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
00516                 }
00517             }
00518 
00519             floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;
00520             floor_setup->data.t1.x_list_dim=2;
00521 
00522             for(j=0;j<floor_setup->data.t1.partitions;++j) {
00523                 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
00524             }
00525 
00526             floor_setup->data.t1.list=av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));
00527 
00528 
00529             rangebits=get_bits(gb, 4);
00530             rangemax = (1 << rangebits);
00531             if (rangemax > vc->blocksize[1] / 2) {
00532                 av_log(vc->avccontext, AV_LOG_ERROR,
00533                        "Floor value is too large for blocksize: %d (%d)\n",
00534                        rangemax, vc->blocksize[1] / 2);
00535                 return -1;
00536             }
00537             floor_setup->data.t1.list[0].x = 0;
00538             floor_setup->data.t1.list[1].x = rangemax;
00539 
00540             for(j=0;j<floor_setup->data.t1.partitions;++j) {
00541                 for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {
00542                     floor_setup->data.t1.list[floor1_values].x=get_bits(gb, rangebits);
00543 
00544                     AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);
00545                 }
00546             }
00547 
00548 // Precalculate order of x coordinates - needed for decode
00549             ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
00550         }
00551         else if(floor_setup->floor_type==0) {
00552             uint_fast8_t max_codebook_dim=0;
00553 
00554             floor_setup->decode=vorbis_floor0_decode;
00555 
00556             floor_setup->data.t0.order=get_bits(gb, 8);
00557             floor_setup->data.t0.rate=get_bits(gb, 16);
00558             floor_setup->data.t0.bark_map_size=get_bits(gb, 16);
00559             floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);
00560             /* zero would result in a div by zero later *
00561              * 2^0 - 1 == 0                             */
00562             if (floor_setup->data.t0.amplitude_bits == 0) {
00563               av_log(vc->avccontext, AV_LOG_ERROR,
00564                      "Floor 0 amplitude bits is 0.\n");
00565               return 1;
00566             }
00567             floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);
00568             floor_setup->data.t0.num_books=get_bits(gb, 4)+1;
00569 
00570             /* allocate mem for booklist */
00571             floor_setup->data.t0.book_list=
00572                 av_malloc(floor_setup->data.t0.num_books);
00573             if(!floor_setup->data.t0.book_list) { return 1; }
00574             /* read book indexes */
00575             {
00576                 int idx;
00577                 uint_fast8_t book_idx;
00578                 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
00579                     book_idx=get_bits(gb, 8);
00580                     if (book_idx>=vc->codebook_count)
00581                         return 1;
00582                     floor_setup->data.t0.book_list[idx]=book_idx;
00583                     if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
00584                         max_codebook_dim=vc->codebooks[book_idx].dimensions;
00585                 }
00586             }
00587 
00588             create_map( vc, i );
00589 
00590             /* allocate mem for lsp coefficients */
00591             {
00592                 /* codebook dim is for padding if codebook dim doesn't *
00593                  * divide order+1 then we need to read more data       */
00594                 floor_setup->data.t0.lsp=
00595                     av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)
00596                               * sizeof(float));
00597                 if(!floor_setup->data.t0.lsp) { return 1; }
00598             }
00599 
00600 #ifdef V_DEBUG /* debug output parsed headers */
00601             AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);
00602             AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);
00603             AV_DEBUG("floor0 bark map size: %u\n",
00604               floor_setup->data.t0.bark_map_size);
00605             AV_DEBUG("floor0 amplitude bits: %u\n",
00606               floor_setup->data.t0.amplitude_bits);
00607             AV_DEBUG("floor0 amplitude offset: %u\n",
00608               floor_setup->data.t0.amplitude_offset);
00609             AV_DEBUG("floor0 number of books: %u\n",
00610               floor_setup->data.t0.num_books);
00611             AV_DEBUG("floor0 book list pointer: %p\n",
00612               floor_setup->data.t0.book_list);
00613             {
00614               int idx;
00615               for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {
00616                 AV_DEBUG( "  Book %d: %u\n",
00617                   idx+1,
00618                   floor_setup->data.t0.book_list[idx] );
00619               }
00620             }
00621 #endif
00622         }
00623         else {
00624             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
00625             return 1;
00626         }
00627     }
00628     return 0;
00629 }
00630 
00631 // Process residues part
00632 
00633 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){
00634     GetBitContext *gb=&vc->gb;
00635     uint_fast8_t i, j, k;
00636 
00637     vc->residue_count=get_bits(gb, 6)+1;
00638     vc->residues=av_mallocz(vc->residue_count * sizeof(vorbis_residue));
00639 
00640     AV_DEBUG(" There are %d residues. \n", vc->residue_count);
00641 
00642     for(i=0;i<vc->residue_count;++i) {
00643         vorbis_residue *res_setup=&vc->residues[i];
00644         uint_fast8_t cascade[64];
00645         uint_fast8_t high_bits;
00646         uint_fast8_t low_bits;
00647 
00648         res_setup->type=get_bits(gb, 16);
00649 
00650         AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);
00651 
00652         res_setup->begin=get_bits(gb, 24);
00653         res_setup->end=get_bits(gb, 24);
00654         res_setup->partition_size=get_bits(gb, 24)+1;
00655         /* Validations to prevent a buffer overflow later. */
00656         if (res_setup->begin>res_setup->end
00657         || res_setup->end > (res_setup->type == 2 ? vc->avccontext->channels : 1) * vc->blocksize[1] / 2
00658         || (res_setup->end-res_setup->begin)/res_setup->partition_size>V_MAX_PARTITIONS) {
00659             av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %d, %d, %d, %d, %d\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1]/2);
00660             return 1;
00661         }
00662 
00663         res_setup->classifications=get_bits(gb, 6)+1;
00664         res_setup->classbook=get_bits(gb, 8);
00665         if (res_setup->classbook>=vc->codebook_count) {
00666             av_log(vc->avccontext, AV_LOG_ERROR, "classbook value %d out of range. \n", res_setup->classbook);
00667             return 1;
00668         }
00669 
00670         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,
00671           res_setup->classifications, res_setup->classbook);
00672 
00673         for(j=0;j<res_setup->classifications;++j) {
00674             high_bits=0;
00675             low_bits=get_bits(gb, 3);
00676             if (get_bits1(gb)) {
00677                 high_bits=get_bits(gb, 5);
00678             }
00679             cascade[j]=(high_bits<<3)+low_bits;
00680 
00681             AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));
00682         }
00683 
00684         res_setup->maxpass=0;
00685         for(j=0;j<res_setup->classifications;++j) {
00686             for(k=0;k<8;++k) {
00687                 if (cascade[j]&(1<<k)) {
00688                     int bits=get_bits(gb, 8);
00689                     if (bits>=vc->codebook_count) {
00690                         av_log(vc->avccontext, AV_LOG_ERROR, "book value %d out of range. \n", bits);
00691                         return 1;
00692                     }
00693                     res_setup->books[j][k]=bits;
00694 
00695                     AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);
00696 
00697                     if (k>res_setup->maxpass) {
00698                         res_setup->maxpass=k;
00699                     }
00700                 } else {
00701                     res_setup->books[j][k]=-1;
00702                 }
00703             }
00704         }
00705     }
00706     return 0;
00707 }
00708 
00709 // Process mappings part
00710 
00711 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {
00712     GetBitContext *gb=&vc->gb;
00713     uint_fast8_t i, j;
00714 
00715     vc->mapping_count=get_bits(gb, 6)+1;
00716     vc->mappings=av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));
00717 
00718     AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);
00719 
00720     for(i=0;i<vc->mapping_count;++i) {
00721         vorbis_mapping *mapping_setup=&vc->mappings[i];
00722 
00723         if (get_bits(gb, 16)) {
00724             av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
00725             return 1;
00726         }
00727         if (get_bits1(gb)) {
00728             mapping_setup->submaps=get_bits(gb, 4)+1;
00729         } else {
00730             mapping_setup->submaps=1;
00731         }
00732 
00733         if (get_bits1(gb)) {
00734             mapping_setup->coupling_steps=get_bits(gb, 8)+1;
00735             mapping_setup->magnitude=av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
00736             mapping_setup->angle    =av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));
00737             for(j=0;j<mapping_setup->coupling_steps;++j) {
00738                 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));
00739                 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));
00740                 if (mapping_setup->magnitude[j]>=vc->audio_channels) {
00741                     av_log(vc->avccontext, AV_LOG_ERROR, "magnitude channel %d out of range. \n", mapping_setup->magnitude[j]);
00742                     return 1;
00743                 }
00744                 if (mapping_setup->angle[j]>=vc->audio_channels) {
00745                     av_log(vc->avccontext, AV_LOG_ERROR, "angle channel %d out of range. \n", mapping_setup->angle[j]);
00746                     return 1;
00747                 }
00748             }
00749         } else {
00750             mapping_setup->coupling_steps=0;
00751         }
00752 
00753         AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);
00754 
00755         if(get_bits(gb, 2)) {
00756             av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);
00757             return 1; // following spec.
00758         }
00759 
00760         if (mapping_setup->submaps>1) {
00761             mapping_setup->mux=av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));
00762             for(j=0;j<vc->audio_channels;++j) {
00763                 mapping_setup->mux[j]=get_bits(gb, 4);
00764             }
00765         }
00766 
00767         for(j=0;j<mapping_setup->submaps;++j) {
00768             int bits;
00769             skip_bits(gb, 8); // FIXME check?
00770             bits=get_bits(gb, 8);
00771             if (bits>=vc->floor_count) {
00772                 av_log(vc->avccontext, AV_LOG_ERROR, "submap floor value %d out of range. \n", bits);
00773                 return -1;
00774             }
00775             mapping_setup->submap_floor[j]=bits;
00776             bits=get_bits(gb, 8);
00777             if (bits>=vc->residue_count) {
00778                 av_log(vc->avccontext, AV_LOG_ERROR, "submap residue value %d out of range. \n", bits);
00779                 return -1;
00780             }
00781             mapping_setup->submap_residue[j]=bits;
00782 
00783             AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);
00784         }
00785     }
00786     return 0;
00787 }
00788 
00789 // Process modes part
00790 
00791 static void create_map( vorbis_context * vc, uint_fast8_t floor_number )
00792 {
00793     vorbis_floor * floors=vc->floors;
00794     vorbis_floor0 * vf;
00795     int idx;
00796     int_fast8_t blockflag;
00797     int_fast32_t * map;
00798     int_fast32_t n; //TODO: could theoretically be smaller?
00799 
00800     for (blockflag=0;blockflag<2;++blockflag)
00801     {
00802     n=vc->blocksize[blockflag]/2;
00803     floors[floor_number].data.t0.map[blockflag]=
00804         av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel
00805 
00806     map=floors[floor_number].data.t0.map[blockflag];
00807     vf=&floors[floor_number].data.t0;
00808 
00809     for (idx=0; idx<n;++idx) {
00810         map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *
00811                               ((vf->bark_map_size)/
00812                                BARK(vf->rate/2.0f )) );
00813         if (vf->bark_map_size-1 < map[idx]) {
00814             map[idx]=vf->bark_map_size-1;
00815         }
00816     }
00817     map[n]=-1;
00818     vf->map_size[blockflag]=n;
00819     }
00820 
00821 #   ifdef V_DEBUG
00822     for(idx=0;idx<=n;++idx) {
00823         AV_DEBUG("floor0 map: map at pos %d is %d\n",
00824                  idx, map[idx]);
00825     }
00826 #   endif
00827 }
00828 
00829 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {
00830     GetBitContext *gb=&vc->gb;
00831     uint_fast8_t i;
00832 
00833     vc->mode_count=get_bits(gb, 6)+1;
00834     vc->modes=av_mallocz(vc->mode_count * sizeof(vorbis_mode));
00835 
00836     AV_DEBUG(" There are %d modes.\n", vc->mode_count);
00837 
00838     for(i=0;i<vc->mode_count;++i) {
00839         vorbis_mode *mode_setup=&vc->modes[i];
00840 
00841         mode_setup->blockflag=get_bits1(gb);
00842         mode_setup->windowtype=get_bits(gb, 16); //FIXME check
00843         mode_setup->transformtype=get_bits(gb, 16); //FIXME check
00844         mode_setup->mapping=get_bits(gb, 8);
00845         if (mode_setup->mapping>=vc->mapping_count) {
00846             av_log(vc->avccontext, AV_LOG_ERROR, "mode mapping value %d out of range. \n", mode_setup->mapping);
00847             return 1;
00848         }
00849 
00850         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);
00851     }
00852     return 0;
00853 }
00854 
00855 // Process the whole setup header using the functions above
00856 
00857 static int vorbis_parse_setup_hdr(vorbis_context *vc) {
00858     GetBitContext *gb=&vc->gb;
00859 
00860     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
00861     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
00862     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
00863         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
00864         return 1;
00865     }
00866 
00867     if (vorbis_parse_setup_hdr_codebooks(vc)) {
00868         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
00869         return 2;
00870     }
00871     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
00872         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
00873         return 3;
00874     }
00875     if (vorbis_parse_setup_hdr_floors(vc)) {
00876         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
00877         return 4;
00878     }
00879     if (vorbis_parse_setup_hdr_residues(vc)) {
00880         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
00881         return 5;
00882     }
00883     if (vorbis_parse_setup_hdr_mappings(vc)) {
00884         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
00885         return 6;
00886     }
00887     if (vorbis_parse_setup_hdr_modes(vc)) {
00888         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
00889         return 7;
00890     }
00891     if (!get_bits1(gb)) {
00892         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
00893         return 8; // framing flag bit unset error
00894     }
00895 
00896     return 0;
00897 }
00898 
00899 // Process the identification header
00900 
00901 static int vorbis_parse_id_hdr(vorbis_context *vc){
00902     GetBitContext *gb=&vc->gb;
00903     uint_fast8_t bl0, bl1;
00904 
00905     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||
00906     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||
00907     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {
00908         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
00909         return 1;
00910     }
00911 
00912     vc->version=get_bits_long(gb, 32);    //FIXME check 0
00913     vc->audio_channels=get_bits(gb, 8);
00914     if(vc->audio_channels <= 0){
00915         av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
00916         return -1;
00917     }
00918     vc->audio_samplerate=get_bits_long(gb, 32);
00919     if(vc->audio_samplerate <= 0){
00920         av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
00921         return -1;
00922     }
00923     vc->bitrate_maximum=get_bits_long(gb, 32);
00924     vc->bitrate_nominal=get_bits_long(gb, 32);
00925     vc->bitrate_minimum=get_bits_long(gb, 32);
00926     bl0=get_bits(gb, 4);
00927     bl1=get_bits(gb, 4);
00928     vc->blocksize[0]=(1<<bl0);
00929     vc->blocksize[1]=(1<<bl1);
00930     if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) {
00931         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
00932         return 3;
00933     }
00934     // output format int16
00935     if (vc->blocksize[1]/2 * vc->audio_channels * 2 >
00936                                              AVCODEC_MAX_AUDIO_FRAME_SIZE) {
00937         av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
00938                "output packets too large.\n");
00939         return 4;
00940     }
00941     vc->win[0]=ff_vorbis_vwin[bl0-6];
00942     vc->win[1]=ff_vorbis_vwin[bl1-6];
00943 
00944     if(vc->exp_bias){
00945         int i, j;
00946         for(j=0; j<2; j++){
00947             float *win = av_malloc(vc->blocksize[j]/2 * sizeof(float));
00948             for(i=0; i<vc->blocksize[j]/2; i++)
00949                 win[i] = vc->win[j][i] * (1<<15);
00950             vc->win[j] = win;
00951         }
00952     }
00953 
00954     if ((get_bits1(gb)) == 0) {
00955         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
00956         return 2;
00957     }
00958 
00959     vc->channel_residues= av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
00960     vc->channel_floors  = av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));
00961     vc->saved           = av_mallocz((vc->blocksize[1]/4)*vc->audio_channels * sizeof(float));
00962     vc->previous_window=0;
00963 
00964     ff_mdct_init(&vc->mdct[0], bl0, 1);
00965     ff_mdct_init(&vc->mdct[1], bl1, 1);
00966 
00967     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 ",
00968             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
00969 
00970 /*
00971     BLK=vc->blocksize[0];
00972     for(i=0;i<BLK/2;++i) {
00973         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)));
00974     }
00975 */
00976 
00977     return 0;
00978 }
00979 
00980 // Process the extradata using the functions above (identification header, setup header)
00981 
00982 static av_cold int vorbis_decode_init(AVCodecContext *avccontext) {
00983     vorbis_context *vc = avccontext->priv_data ;
00984     uint8_t *headers = avccontext->extradata;
00985     int headers_len=avccontext->extradata_size;
00986     uint8_t *header_start[3];
00987     int header_len[3];
00988     GetBitContext *gb = &(vc->gb);
00989     int hdr_type;
00990 
00991     vc->avccontext = avccontext;
00992     dsputil_init(&vc->dsp, avccontext);
00993 
00994     if(vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
00995         vc->add_bias = 385;
00996         vc->exp_bias = 0;
00997     } else {
00998         vc->add_bias = 0;
00999         vc->exp_bias = 15<<23;
01000     }
01001 
01002     if (!headers_len) {
01003         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
01004         return -1;
01005     }
01006 
01007     if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
01008         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
01009         return -1;
01010     }
01011 
01012     init_get_bits(gb, header_start[0], header_len[0]*8);
01013     hdr_type=get_bits(gb, 8);
01014     if (hdr_type!=1) {
01015         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
01016         return -1;
01017     }
01018     if (vorbis_parse_id_hdr(vc)) {
01019         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
01020         vorbis_free(vc);
01021         return -1;
01022     }
01023 
01024     init_get_bits(gb, header_start[2], header_len[2]*8);
01025     hdr_type=get_bits(gb, 8);
01026     if (hdr_type!=5) {
01027         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
01028         vorbis_free(vc);
01029         return -1;
01030     }
01031     if (vorbis_parse_setup_hdr(vc)) {
01032         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
01033         vorbis_free(vc);
01034         return -1;
01035     }
01036 
01037     avccontext->channels = vc->audio_channels;
01038     avccontext->sample_rate = vc->audio_samplerate;
01039     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1])>>2;
01040     avccontext->sample_fmt = SAMPLE_FMT_S16;
01041 
01042     return 0 ;
01043 }
01044 
01045 // Decode audiopackets -------------------------------------------------
01046 
01047 // Read and decode floor
01048 
01049 static int vorbis_floor0_decode(vorbis_context *vc,
01050                                          vorbis_floor_data *vfu, float *vec) {
01051     vorbis_floor0 * vf=&vfu->t0;
01052     float * lsp=vf->lsp;
01053     uint_fast32_t amplitude;
01054     uint_fast32_t book_idx;
01055     uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;
01056 
01057     amplitude=get_bits(&vc->gb, vf->amplitude_bits);
01058     if (amplitude>0) {
01059         float last = 0;
01060         uint_fast16_t lsp_len = 0;
01061         uint_fast16_t idx;
01062         vorbis_codebook codebook;
01063 
01064         book_idx=get_bits(&vc->gb, ilog(vf->num_books));
01065         if ( book_idx >= vf->num_books ) {
01066             av_log( vc->avccontext, AV_LOG_ERROR,
01067                     "floor0 dec: booknumber too high!\n" );
01068             book_idx= 0;
01069             //FIXME: look above
01070         }
01071         AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );
01072         codebook=vc->codebooks[vf->book_list[book_idx]];
01073         /* Invalid codebook! */
01074         if (!codebook.codevectors)
01075             return -1;
01076 
01077         while (lsp_len<vf->order) {
01078             int vec_off;
01079 
01080             AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );
01081             AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );
01082             /* read temp vector */
01083             vec_off=get_vlc2(&vc->gb,
01084                              codebook.vlc.table,
01085                              codebook.nb_bits,
01086                              codebook.maxdepth ) *
01087                              codebook.dimensions;
01088             AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );
01089             /* copy each vector component and add last to it */
01090             for (idx=0; idx<codebook.dimensions; ++idx) {
01091                 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;
01092             }
01093             last=lsp[lsp_len+idx-1]; /* set last to last vector component */
01094 
01095             lsp_len += codebook.dimensions;
01096         }
01097 #ifdef V_DEBUG
01098         /* DEBUG: output lsp coeffs */
01099         {
01100             int idx;
01101             for ( idx = 0; idx < lsp_len; ++idx )
01102                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );
01103         }
01104 #endif
01105 
01106         /* synthesize floor output vector */
01107         {
01108             int i;
01109             int order=vf->order;
01110             float wstep=M_PI/vf->bark_map_size;
01111 
01112             for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }
01113 
01114             AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",
01115                      vf->map_size, order, wstep);
01116 
01117             i=0;
01118             while(i<vf->map_size[blockflag]) {
01119                 int j, iter_cond=vf->map[blockflag][i];
01120                 float p=0.5f;
01121                 float q=0.5f;
01122                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times
01123 
01124                 /* similar part for the q and p products */
01125                 for(j=0;j<order;j+=2) {
01126                     q *= lsp[j]  -two_cos_w;
01127                     p *= lsp[j+1]-two_cos_w;
01128                 }
01129                 if(j==order) { // even order
01130                     p *= p*(2.0f-two_cos_w);
01131                     q *= q*(2.0f+two_cos_w);
01132                 }
01133                 else { // odd order
01134                     q *= two_cos_w-lsp[j]; // one more time for q
01135 
01136                     /* final step and square */
01137                     p *= p*(4.f-two_cos_w*two_cos_w);
01138                     q *= q;
01139                 }
01140 
01141                 /* calculate linear floor value */
01142                 {
01143                     q=exp( (
01144                              ( (amplitude*vf->amplitude_offset)/
01145                                (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )
01146                              - vf->amplitude_offset ) * .11512925f
01147                          );
01148                 }
01149 
01150                 /* fill vector */
01151                 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);
01152             }
01153         }
01154     }
01155     else {
01156         /* this channel is unused */
01157         return 1;
01158     }
01159 
01160     AV_DEBUG(" Floor0 decoded\n");
01161 
01162     return 0;
01163 }
01164 
01165 static int vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {
01166     vorbis_floor1 * vf=&vfu->t1;
01167     GetBitContext *gb=&vc->gb;
01168     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };
01169     uint_fast16_t range=range_v[vf->multiplier-1];
01170     uint_fast16_t floor1_Y[vf->x_list_dim];
01171     uint_fast16_t floor1_Y_final[vf->x_list_dim];
01172     int floor1_flag[vf->x_list_dim];
01173     uint_fast8_t class_;
01174     uint_fast8_t cdim;
01175     uint_fast8_t cbits;
01176     uint_fast8_t csub;
01177     uint_fast8_t cval;
01178     int_fast16_t book;
01179     uint_fast16_t offset;
01180     uint_fast16_t i,j;
01181     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?
01182     int_fast16_t dy, err;
01183 
01184 
01185     if (!get_bits1(gb)) return 1; // silence
01186 
01187 // Read values (or differences) for the floor's points
01188 
01189     floor1_Y[0]=get_bits(gb, ilog(range-1));
01190     floor1_Y[1]=get_bits(gb, ilog(range-1));
01191 
01192     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
01193 
01194     offset=2;
01195     for(i=0;i<vf->partitions;++i) {
01196         class_=vf->partition_class[i];
01197         cdim=vf->class_dimensions[class_];
01198         cbits=vf->class_subclasses[class_];
01199         csub=(1<<cbits)-1;
01200         cval=0;
01201 
01202         AV_DEBUG("Cbits %d \n", cbits);
01203 
01204         if (cbits) { // this reads all subclasses for this partition's class
01205             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,
01206             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);
01207         }
01208 
01209         for(j=0;j<cdim;++j) {
01210             book=vf->subclass_books[class_][cval & csub];
01211 
01212             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));
01213 
01214             cval=cval>>cbits;
01215             if (book>-1) {
01216                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,
01217                 vc->codebooks[book].nb_bits, 3);
01218             } else {
01219                 floor1_Y[offset+j]=0;
01220             }
01221 
01222             AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);
01223         }
01224         offset+=cdim;
01225     }
01226 
01227 // Amplitude calculation from the differences
01228 
01229     floor1_flag[0]=1;
01230     floor1_flag[1]=1;
01231     floor1_Y_final[0]=floor1_Y[0];
01232     floor1_Y_final[1]=floor1_Y[1];
01233 
01234     for(i=2;i<vf->x_list_dim;++i) {
01235         uint_fast16_t val, highroom, lowroom, room;
01236         uint_fast16_t high_neigh_offs;
01237         uint_fast16_t low_neigh_offs;
01238 
01239         low_neigh_offs=vf->list[i].low;
01240         high_neigh_offs=vf->list[i].high;
01241         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin
01242         adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;
01243         ady= FFABS(dy);
01244         err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);
01245         off=(int16_t)err/(int16_t)adx;
01246         if (dy<0) {
01247             predicted=floor1_Y_final[low_neigh_offs]-off;
01248         } else {
01249             predicted=floor1_Y_final[low_neigh_offs]+off;
01250         } // render_point end
01251 
01252         val=floor1_Y[i];
01253         highroom=range-predicted;
01254         lowroom=predicted;
01255         if (highroom < lowroom) {
01256             room=highroom*2;
01257         } else {
01258             room=lowroom*2;   // SPEC mispelling
01259         }
01260         if (val) {
01261             floor1_flag[low_neigh_offs]=1;
01262             floor1_flag[high_neigh_offs]=1;
01263             floor1_flag[i]=1;
01264             if (val>=room) {
01265                 if (highroom > lowroom) {
01266                     floor1_Y_final[i]=val-lowroom+predicted;
01267                 } else {
01268                     floor1_Y_final[i]=predicted-val+highroom-1;
01269                 }
01270             } else {
01271                 if (val & 1) {
01272                     floor1_Y_final[i]=predicted-(val+1)/2;
01273                 } else {
01274                     floor1_Y_final[i]=predicted+val/2;
01275                 }
01276             }
01277         } else {
01278             floor1_flag[i]=0;
01279             floor1_Y_final[i]=predicted;
01280         }
01281 
01282         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);
01283     }
01284 
01285 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
01286 
01287     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
01288 
01289     AV_DEBUG(" Floor decoded\n");
01290 
01291     return 0;
01292 }
01293 
01294 // Read and decode residue
01295 
01296 static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen, unsigned ch_left, int vr_type) {
01297     GetBitContext *gb=&vc->gb;
01298     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;
01299     uint_fast16_t n_to_read=vr->end-vr->begin;
01300     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;
01301     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];
01302     uint_fast8_t pass;
01303     uint_fast8_t ch_used;
01304     uint_fast8_t i,j,l;
01305     uint_fast16_t k;
01306     unsigned max_output = (ch - 1) * vlen;
01307 
01308     if (vr_type==2) {
01309         for(j=1;j<ch;++j) {
01310                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input
01311         }
01312         if (do_not_decode[0]) return 0;
01313         ch_used=1;
01314         max_output += vr->end / ch;
01315     } else {
01316         ch_used=ch;
01317         max_output += vr->end;
01318     }
01319 
01320     if (max_output > ch_left * vlen) {
01321         av_log(vc->avccontext, AV_LOG_ERROR, "Insufficient output buffer\n");
01322         return -1;
01323     }
01324 
01325     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
01326 
01327     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?
01328         uint_fast16_t voffset;
01329         uint_fast16_t partition_count;
01330         uint_fast16_t j_times_ptns_to_read;
01331 
01332         voffset=vr->begin;
01333         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error
01334             if (!pass) {
01335                 uint_fast32_t inverse_class = ff_inverse[vr->classifications];
01336                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
01337                     if (!do_not_decode[j]) {
01338                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
01339                         vc->codebooks[vr->classbook].nb_bits, 3);
01340 
01341                         AV_DEBUG("Classword: %d \n", temp);
01342 
01343                         assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]
01344                         for(i=0;i<c_p_c;++i) {
01345                             uint_fast32_t temp2;
01346 
01347                             temp2=(((uint_fast64_t)temp) * inverse_class)>>32;
01348                             if (partition_count+c_p_c-1-i < ptns_to_read) {
01349                                 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;
01350                             }
01351                             temp=temp2;
01352                         }
01353                     }
01354                     j_times_ptns_to_read+=ptns_to_read;
01355                 }
01356             }
01357             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {
01358                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {
01359                     uint_fast16_t voffs;
01360 
01361                     if (!do_not_decode[j]) {
01362                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];
01363                         int_fast16_t vqbook=vr->books[vqclass][pass];
01364 
01365                         if (vqbook>=0 && vc->codebooks[vqbook].codevectors) {
01366                             uint_fast16_t coffs;
01367                             unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64
01368                             uint_fast16_t step= dim==1 ? vr->partition_size
01369                                               : FASTDIV(vr->partition_size, dim);
01370                             vorbis_codebook codebook= vc->codebooks[vqbook];
01371 
01372                             if (vr_type==0) {
01373 
01374                                 voffs=voffset+j*vlen;
01375                                 for(k=0;k<step;++k) {
01376                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
01377                                     for(l=0;l<dim;++l) {
01378                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH
01379                                     }
01380                                 }
01381                             }
01382                             else if (vr_type==1) {
01383                                 voffs=voffset+j*vlen;
01384                                 for(k=0;k<step;++k) {
01385                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
01386                                     for(l=0;l<dim;++l, ++voffs) {
01387                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
01388 
01389                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
01390                                     }
01391                                 }
01392                             }
01393                             else if (vr_type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized
01394                                 voffs=voffset>>1;
01395 
01396                                 if(dim==2) {
01397                                     for(k=0;k<step;++k) {
01398                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
01399                                         vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH
01400                                         vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH
01401                                     }
01402                                 } else if(dim==4) {
01403                                     for(k=0;k<step;++k, voffs+=2) {
01404                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
01405                                         vec[voffs       ]+=codebook.codevectors[coffs  ];  // FPMATH
01406                                         vec[voffs+1     ]+=codebook.codevectors[coffs+2];  // FPMATH
01407                                         vec[voffs+vlen  ]+=codebook.codevectors[coffs+1];  // FPMATH
01408                                         vec[voffs+vlen+1]+=codebook.codevectors[coffs+3];  // FPMATH
01409                                     }
01410                                 } else
01411                                 for(k=0;k<step;++k) {
01412                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
01413                                     for(l=0;l<dim;l+=2, voffs++) {
01414                                         vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH
01415                                         vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH
01416 
01417                                         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);
01418                                     }
01419                                 }
01420 
01421                             }
01422                             else if (vr_type==2) {
01423                                 voffs=voffset;
01424 
01425                                 for(k=0;k<step;++k) {
01426                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
01427                                     for(l=0;l<dim;++l, ++voffs) {
01428                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %
01429 
01430                                         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);
01431                                     }
01432                                 }
01433                             }
01434                         }
01435                     }
01436                     j_times_ptns_to_read+=ptns_to_read;
01437                 }
01438                 ++partition_count;
01439                 voffset+=vr->partition_size;
01440             }
01441         }
01442     }
01443     return 0;
01444 }
01445 
01446 static inline 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, unsigned ch_left)
01447 {
01448     if (vr->type==2)
01449         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);
01450     else if (vr->type == 1)
01451         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);
01452     else if (vr->type == 0)
01453         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);
01454     else {
01455         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
01456         return 1;
01457     }
01458 }
01459 
01460 void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
01461 {
01462     int i;
01463     for(i=0; i<blocksize; i++)
01464     {
01465         if (mag[i]>0.0) {
01466             if (ang[i]>0.0) {
01467                 ang[i]=mag[i]-ang[i];
01468             } else {
01469                 float temp=ang[i];
01470                 ang[i]=mag[i];
01471                 mag[i]+=temp;
01472             }
01473         } else {
01474             if (ang[i]>0.0) {
01475                 ang[i]+=mag[i];
01476             } else {
01477                 float temp=ang[i];
01478                 ang[i]=mag[i];
01479                 mag[i]-=temp;
01480             }
01481         }
01482     }
01483 }
01484 
01485 static void copy_normalize(float *dst, float *src, int len, int exp_bias, float add_bias)
01486 {
01487     int i;
01488     if(exp_bias) {
01489         for(i=0; i<len; i++)
01490             ((uint32_t*)dst)[i] = ((uint32_t*)src)[i] + exp_bias; // dst[k]=src[i]*(1<<bias)
01491     } else {
01492         for(i=0; i<len; i++)
01493             dst[i] = src[i] + add_bias;
01494     }
01495 }
01496 
01497 // Decode the audio packet using the functions above
01498 
01499 static int vorbis_parse_audio_packet(vorbis_context *vc) {
01500     GetBitContext *gb=&vc->gb;
01501 
01502     uint_fast8_t previous_window=vc->previous_window;
01503     uint_fast8_t mode_number;
01504     uint_fast8_t blockflag;
01505     uint_fast16_t blocksize;
01506     int_fast32_t i,j;
01507     uint_fast8_t no_residue[vc->audio_channels];
01508     uint_fast8_t do_not_decode[vc->audio_channels];
01509     vorbis_mapping *mapping;
01510     float *ch_res_ptr=vc->channel_residues;
01511     float *ch_floor_ptr=vc->channel_floors;
01512     uint_fast8_t res_chan[vc->audio_channels];
01513     uint_fast8_t res_num=0;
01514     int_fast16_t retlen=0;
01515     float fadd_bias = vc->add_bias;
01516     unsigned ch_left = vc->audio_channels;
01517     unsigned vlen;
01518 
01519     if (get_bits1(gb)) {
01520         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
01521         return -1; // packet type not audio
01522     }
01523 
01524     if (vc->mode_count==1) {
01525         mode_number=0;
01526     } else {
01527         mode_number=get_bits(gb, ilog(vc->mode_count-1));
01528     }
01529     if (mode_number>=vc->mode_count) {
01530         av_log(vc->avccontext, AV_LOG_ERROR, "mode number %d out of range.\n", mode_number);
01531         return -1;
01532     }
01533     vc->mode_number=mode_number;
01534     mapping=&vc->mappings[vc->modes[mode_number].mapping];
01535 
01536     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
01537 
01538     blockflag=vc->modes[mode_number].blockflag;
01539     blocksize=vc->blocksize[blockflag];
01540     vlen = blocksize / 2;
01541     if (blockflag) {
01542         skip_bits(gb, 2); // previous_window, next_window
01543     }
01544 
01545     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*vlen); //FIXME can this be removed ?
01546     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*vlen); //FIXME can this be removed ?
01547 
01548 // Decode floor
01549 
01550     for(i=0;i<vc->audio_channels;++i) {
01551         vorbis_floor *floor;
01552         int ret;
01553         if (mapping->submaps>1) {
01554             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];
01555         } else {
01556             floor=&vc->floors[mapping->submap_floor[0]];
01557         }
01558 
01559         ret = floor->decode(vc, &floor->data, ch_floor_ptr);
01560 
01561         if (ret < 0) {
01562             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
01563             return -1;
01564         }
01565         no_residue[i] = ret;
01566         ch_floor_ptr += vlen;
01567     }
01568 
01569 // Nonzero vector propagate
01570 
01571     for(i=mapping->coupling_steps-1;i>=0;--i) {
01572         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
01573             no_residue[mapping->magnitude[i]]=0;
01574             no_residue[mapping->angle[i]]=0;
01575         }
01576     }
01577 
01578 // Decode residue
01579 
01580     for(i=0;i<mapping->submaps;++i) {
01581         vorbis_residue *residue;
01582         uint_fast8_t ch=0;
01583         int ret;
01584 
01585         for(j=0;j<vc->audio_channels;++j) {
01586             if ((mapping->submaps==1) || (i==mapping->mux[j])) {
01587                 res_chan[j]=res_num;
01588                 if (no_residue[j]) {
01589                     do_not_decode[ch]=1;
01590                 } else {
01591                     do_not_decode[ch]=0;
01592                 }
01593                 ++ch;
01594                 ++res_num;
01595             }
01596         }
01597         residue=&vc->residues[mapping->submap_residue[i]];
01598         if (ch_left < ch) {
01599             av_log(vc->avccontext, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
01600             return -1;
01601         }
01602         if (ch) {
01603             ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
01604             if (ret < 0)
01605                 return ret;
01606         }
01607 
01608         ch_res_ptr += ch * vlen;
01609         ch_left -= ch;
01610     }
01611 
01612 // Inverse coupling
01613 
01614     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed
01615         float *mag, *ang;
01616 
01617         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;
01618         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;
01619         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);
01620     }
01621 
01622 // Dotproduct, MDCT
01623 
01624     for(j=vc->audio_channels-1;j>=0;j--) {
01625         ch_floor_ptr=vc->channel_floors+j*blocksize/2;
01626         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;
01627         vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);
01628         ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);
01629     }
01630 
01631 // Overlap/add, save data for next overlapping  FPMATH
01632 
01633     retlen = (blocksize + vc->blocksize[previous_window])/4;
01634     for(j=0;j<vc->audio_channels;j++) {
01635         uint_fast16_t bs0=vc->blocksize[0];
01636         uint_fast16_t bs1=vc->blocksize[1];
01637         float *residue=vc->channel_residues+res_chan[j]*blocksize/2;
01638         float *saved=vc->saved+j*bs1/4;
01639         float *ret=vc->channel_floors+j*retlen;
01640         float *buf=residue;
01641         const float *win=vc->win[blockflag&previous_window];
01642 
01643         if(blockflag == previous_window) {
01644             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize/4);
01645         } else if(blockflag > previous_window) {
01646             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0/4);
01647             copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
01648         } else {
01649             copy_normalize(ret, saved, (bs1-bs0)/4, vc->exp_bias, fadd_bias);
01650             vc->dsp.vector_fmul_window(ret+(bs1-bs0)/4, saved+(bs1-bs0)/4, buf, win, fadd_bias, bs0/4);
01651         }
01652         memcpy(saved, buf+blocksize/4, blocksize/4*sizeof(float));
01653     }
01654 
01655     vc->previous_window = blockflag;
01656     return retlen;
01657 }
01658 
01659 // Return the decoded audio packet through the standard api
01660 
01661 static int vorbis_decode_frame(AVCodecContext *avccontext,
01662                         void *data, int *data_size,
01663                         const uint8_t *buf, int buf_size)
01664 {
01665     vorbis_context *vc = avccontext->priv_data ;
01666     GetBitContext *gb = &(vc->gb);
01667     const float *channel_ptrs[vc->audio_channels];
01668     int i;
01669 
01670     int_fast16_t len;
01671 
01672     if(!buf_size){
01673         return 0;
01674     }
01675 
01676     AV_DEBUG("packet length %d \n", buf_size);
01677 
01678     init_get_bits(gb, buf, buf_size*8);
01679 
01680     len=vorbis_parse_audio_packet(vc);
01681 
01682     if (len<=0) {
01683         *data_size=0;
01684         return buf_size;
01685     }
01686 
01687     if (!vc->first_frame) {
01688         vc->first_frame=1;
01689         *data_size=0;
01690         return buf_size ;
01691     }
01692 
01693     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
01694 
01695     for(i=0; i<vc->audio_channels; i++)
01696         channel_ptrs[i] = vc->channel_floors+i*len;
01697     vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);
01698     *data_size=len*2*vc->audio_channels;
01699 
01700     return buf_size ;
01701 }
01702 
01703 // Close decoder
01704 
01705 static av_cold int vorbis_decode_close(AVCodecContext *avccontext) {
01706     vorbis_context *vc = avccontext->priv_data;
01707 
01708     vorbis_free(vc);
01709 
01710     return 0 ;
01711 }
01712 
01713 AVCodec vorbis_decoder = {
01714     "vorbis",
01715     CODEC_TYPE_AUDIO,
01716     CODEC_ID_VORBIS,
01717     sizeof(vorbis_context),
01718     vorbis_decode_init,
01719     NULL,
01720     vorbis_decode_close,
01721     vorbis_decode_frame,
01722     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
01723 };
01724 

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