Libav 0.7.1
libavcodec/vorbisdec.c
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00001 
00023 #include <inttypes.h>
00024 #include <math.h>
00025 
00026 #define ALT_BITSTREAM_READER_LE
00027 #include "avcodec.h"
00028 #include "get_bits.h"
00029 #include "dsputil.h"
00030 #include "fft.h"
00031 #include "fmtconvert.h"
00032 
00033 #include "vorbis.h"
00034 #include "xiph.h"
00035 
00036 #define V_NB_BITS 8
00037 #define V_NB_BITS2 11
00038 #define V_MAX_VLCS (1 << 16)
00039 #define V_MAX_PARTITIONS (1 << 20)
00040 
00041 #undef NDEBUG
00042 #include <assert.h>
00043 
00044 typedef struct {
00045     uint8_t      dimensions;
00046     uint8_t      lookup_type;
00047     uint8_t      maxdepth;
00048     VLC          vlc;
00049     float       *codevectors;
00050     unsigned int nb_bits;
00051 } vorbis_codebook;
00052 
00053 typedef union  vorbis_floor_u  vorbis_floor_data;
00054 typedef struct vorbis_floor0_s vorbis_floor0;
00055 typedef struct vorbis_floor1_s vorbis_floor1;
00056 struct vorbis_context_s;
00057 typedef
00058 int (* vorbis_floor_decode_func)
00059     (struct vorbis_context_s *, vorbis_floor_data *, float *);
00060 typedef struct {
00061     uint8_t floor_type;
00062     vorbis_floor_decode_func decode;
00063     union vorbis_floor_u {
00064         struct vorbis_floor0_s {
00065             uint8_t       order;
00066             uint16_t      rate;
00067             uint16_t      bark_map_size;
00068             int32_t      *map[2];
00069             uint32_t      map_size[2];
00070             uint8_t       amplitude_bits;
00071             uint8_t       amplitude_offset;
00072             uint8_t       num_books;
00073             uint8_t      *book_list;
00074             float        *lsp;
00075         } t0;
00076         struct vorbis_floor1_s {
00077             uint8_t       partitions;
00078             uint8_t       partition_class[32];
00079             uint8_t       class_dimensions[16];
00080             uint8_t       class_subclasses[16];
00081             uint8_t       class_masterbook[16];
00082             int16_t       subclass_books[16][8];
00083             uint8_t       multiplier;
00084             uint16_t      x_list_dim;
00085             vorbis_floor1_entry *list;
00086         } t1;
00087     } data;
00088 } vorbis_floor;
00089 
00090 typedef struct {
00091     uint16_t      type;
00092     uint32_t      begin;
00093     uint32_t      end;
00094     unsigned      partition_size;
00095     uint8_t       classifications;
00096     uint8_t       classbook;
00097     int16_t       books[64][8];
00098     uint8_t       maxpass;
00099     uint16_t      ptns_to_read;
00100     uint8_t      *classifs;
00101 } vorbis_residue;
00102 
00103 typedef struct {
00104     uint8_t       submaps;
00105     uint16_t      coupling_steps;
00106     uint8_t      *magnitude;
00107     uint8_t      *angle;
00108     uint8_t      *mux;
00109     uint8_t       submap_floor[16];
00110     uint8_t       submap_residue[16];
00111 } vorbis_mapping;
00112 
00113 typedef struct {
00114     uint8_t       blockflag;
00115     uint16_t      windowtype;
00116     uint16_t      transformtype;
00117     uint8_t       mapping;
00118 } vorbis_mode;
00119 
00120 typedef struct vorbis_context_s {
00121     AVCodecContext *avccontext;
00122     GetBitContext gb;
00123     DSPContext dsp;
00124     FmtConvertContext fmt_conv;
00125 
00126     FFTContext mdct[2];
00127     uint8_t       first_frame;
00128     uint32_t      version;
00129     uint8_t       audio_channels;
00130     uint32_t      audio_samplerate;
00131     uint32_t      bitrate_maximum;
00132     uint32_t      bitrate_nominal;
00133     uint32_t      bitrate_minimum;
00134     uint32_t      blocksize[2];
00135     const float  *win[2];
00136     uint16_t      codebook_count;
00137     vorbis_codebook *codebooks;
00138     uint8_t       floor_count;
00139     vorbis_floor *floors;
00140     uint8_t       residue_count;
00141     vorbis_residue *residues;
00142     uint8_t       mapping_count;
00143     vorbis_mapping *mappings;
00144     uint8_t       mode_count;
00145     vorbis_mode  *modes;
00146     uint8_t       mode_number; // mode number for the current packet
00147     uint8_t       previous_window;
00148     float        *channel_residues;
00149     float        *channel_floors;
00150     float        *saved;
00151     float         scale_bias; // for float->int conversion
00152 } vorbis_context;
00153 
00154 /* Helper functions */
00155 
00156 #define BARK(x) \
00157     (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
00158 
00159 static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
00160 #define VALIDATE_INDEX(idx, limit) \
00161     if (idx >= limit) {\
00162         av_log(vc->avccontext, AV_LOG_ERROR,\
00163                idx_err_str,\
00164                (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
00165         return -1;\
00166     }
00167 #define GET_VALIDATED_INDEX(idx, bits, limit) \
00168     {\
00169         idx = get_bits(gb, bits);\
00170         VALIDATE_INDEX(idx, limit)\
00171     }
00172 
00173 static float vorbisfloat2float(unsigned val)
00174 {
00175     double mant = val & 0x1fffff;
00176     long exp    = (val & 0x7fe00000L) >> 21;
00177     if (val & 0x80000000)
00178         mant = -mant;
00179     return ldexp(mant, exp - 20 - 768);
00180 }
00181 
00182 
00183 // Free all allocated memory -----------------------------------------
00184 
00185 static void vorbis_free(vorbis_context *vc)
00186 {
00187     int i;
00188 
00189     av_freep(&vc->channel_residues);
00190     av_freep(&vc->channel_floors);
00191     av_freep(&vc->saved);
00192 
00193     for (i = 0; i < vc->residue_count; i++)
00194         av_free(vc->residues[i].classifs);
00195     av_freep(&vc->residues);
00196     av_freep(&vc->modes);
00197 
00198     ff_mdct_end(&vc->mdct[0]);
00199     ff_mdct_end(&vc->mdct[1]);
00200 
00201     for (i = 0; i < vc->codebook_count; ++i) {
00202         av_free(vc->codebooks[i].codevectors);
00203         free_vlc(&vc->codebooks[i].vlc);
00204     }
00205     av_freep(&vc->codebooks);
00206 
00207     for (i = 0; i < vc->floor_count; ++i) {
00208         if (vc->floors[i].floor_type == 0) {
00209             av_free(vc->floors[i].data.t0.map[0]);
00210             av_free(vc->floors[i].data.t0.map[1]);
00211             av_free(vc->floors[i].data.t0.book_list);
00212             av_free(vc->floors[i].data.t0.lsp);
00213         } else {
00214             av_free(vc->floors[i].data.t1.list);
00215         }
00216     }
00217     av_freep(&vc->floors);
00218 
00219     for (i = 0; i < vc->mapping_count; ++i) {
00220         av_free(vc->mappings[i].magnitude);
00221         av_free(vc->mappings[i].angle);
00222         av_free(vc->mappings[i].mux);
00223     }
00224     av_freep(&vc->mappings);
00225 }
00226 
00227 // Parse setup header -------------------------------------------------
00228 
00229 // Process codebooks part
00230 
00231 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
00232 {
00233     unsigned cb;
00234     uint8_t  *tmp_vlc_bits;
00235     uint32_t *tmp_vlc_codes;
00236     GetBitContext *gb = &vc->gb;
00237     uint16_t *codebook_multiplicands;
00238 
00239     vc->codebook_count = get_bits(gb, 8) + 1;
00240 
00241     av_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);
00242 
00243     vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
00244     tmp_vlc_bits  = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
00245     tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
00246     codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
00247 
00248     for (cb = 0; cb < vc->codebook_count; ++cb) {
00249         vorbis_codebook *codebook_setup = &vc->codebooks[cb];
00250         unsigned ordered, t, entries, used_entries = 0;
00251 
00252         av_dlog(NULL, " %u. Codebook\n", cb);
00253 
00254         if (get_bits(gb, 24) != 0x564342) {
00255             av_log(vc->avccontext, AV_LOG_ERROR,
00256                    " %u. Codebook setup data corrupt.\n", cb);
00257             goto error;
00258         }
00259 
00260         codebook_setup->dimensions=get_bits(gb, 16);
00261         if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
00262             av_log(vc->avccontext, AV_LOG_ERROR,
00263                    " %u. Codebook's dimension is invalid (%d).\n",
00264                    cb, codebook_setup->dimensions);
00265             goto error;
00266         }
00267         entries = get_bits(gb, 24);
00268         if (entries > V_MAX_VLCS) {
00269             av_log(vc->avccontext, AV_LOG_ERROR,
00270                    " %u. Codebook has too many entries (%u).\n",
00271                    cb, entries);
00272             goto error;
00273         }
00274 
00275         ordered = get_bits1(gb);
00276 
00277         av_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
00278                 codebook_setup->dimensions, entries);
00279 
00280         if (!ordered) {
00281             unsigned ce, flag;
00282             unsigned sparse = get_bits1(gb);
00283 
00284             av_dlog(NULL, " not ordered \n");
00285 
00286             if (sparse) {
00287                 av_dlog(NULL, " sparse \n");
00288 
00289                 used_entries = 0;
00290                 for (ce = 0; ce < entries; ++ce) {
00291                     flag = get_bits1(gb);
00292                     if (flag) {
00293                         tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
00294                         ++used_entries;
00295                     } else
00296                         tmp_vlc_bits[ce] = 0;
00297                 }
00298             } else {
00299                 av_dlog(NULL, " not sparse \n");
00300 
00301                 used_entries = entries;
00302                 for (ce = 0; ce < entries; ++ce)
00303                     tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
00304             }
00305         } else {
00306             unsigned current_entry  = 0;
00307             unsigned current_length = get_bits(gb, 5) + 1;
00308 
00309             av_dlog(NULL, " ordered, current length: %u\n", current_length);  //FIXME
00310 
00311             used_entries = entries;
00312             for (; current_entry < used_entries && current_length <= 32; ++current_length) {
00313                 unsigned i, number;
00314 
00315                 av_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
00316 
00317                 number = get_bits(gb, ilog(entries - current_entry));
00318 
00319                 av_dlog(NULL, " number: %u\n", number);
00320 
00321                 for (i = current_entry; i < number+current_entry; ++i)
00322                     if (i < used_entries)
00323                         tmp_vlc_bits[i] = current_length;
00324 
00325                 current_entry+=number;
00326             }
00327             if (current_entry>used_entries) {
00328                 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
00329                 goto error;
00330             }
00331         }
00332 
00333         codebook_setup->lookup_type = get_bits(gb, 4);
00334 
00335         av_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,
00336                 codebook_setup->lookup_type ? "vq" : "no lookup");
00337 
00338 // If the codebook is used for (inverse) VQ, calculate codevectors.
00339 
00340         if (codebook_setup->lookup_type == 1) {
00341             unsigned i, j, k;
00342             unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
00343 
00344             float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
00345             float codebook_delta_value   = vorbisfloat2float(get_bits_long(gb, 32));
00346             unsigned codebook_value_bits = get_bits(gb, 4) + 1;
00347             unsigned codebook_sequence_p = get_bits1(gb);
00348 
00349             av_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
00350                     codebook_lookup_values);
00351             av_dlog(NULL, "  delta %f minmum %f \n",
00352                     codebook_delta_value, codebook_minimum_value);
00353 
00354             for (i = 0; i < codebook_lookup_values; ++i) {
00355                 codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
00356 
00357                 av_dlog(NULL, " multiplicands*delta+minmum : %e \n",
00358                         (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
00359                 av_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);
00360             }
00361 
00362 // Weed out unused vlcs and build codevector vector
00363             codebook_setup->codevectors = used_entries ? av_mallocz(used_entries *
00364                                                                     codebook_setup->dimensions *
00365                                                                     sizeof(*codebook_setup->codevectors))
00366                                                        : NULL;
00367             for (j = 0, i = 0; i < entries; ++i) {
00368                 unsigned dim = codebook_setup->dimensions;
00369 
00370                 if (tmp_vlc_bits[i]) {
00371                     float last = 0.0;
00372                     unsigned lookup_offset = i;
00373 
00374                     av_dlog(vc->avccontext, "Lookup offset %u ,", i);
00375 
00376                     for (k = 0; k < dim; ++k) {
00377                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;
00378                         codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
00379                         if (codebook_sequence_p)
00380                             last = codebook_setup->codevectors[j * dim + k];
00381                         lookup_offset/=codebook_lookup_values;
00382                     }
00383                     tmp_vlc_bits[j] = tmp_vlc_bits[i];
00384 
00385                     av_dlog(vc->avccontext, "real lookup offset %u, vector: ", j);
00386                     for (k = 0; k < dim; ++k)
00387                         av_dlog(vc->avccontext, " %f ",
00388                                 codebook_setup->codevectors[j * dim + k]);
00389                     av_dlog(vc->avccontext, "\n");
00390 
00391                     ++j;
00392                 }
00393             }
00394             if (j != used_entries) {
00395                 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
00396                 goto error;
00397             }
00398             entries = used_entries;
00399         } else if (codebook_setup->lookup_type >= 2) {
00400             av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
00401             goto error;
00402         }
00403 
00404 // Initialize VLC table
00405         if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
00406             av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
00407             goto error;
00408         }
00409         codebook_setup->maxdepth = 0;
00410         for (t = 0; t < entries; ++t)
00411             if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
00412                 codebook_setup->maxdepth = tmp_vlc_bits[t];
00413 
00414         if (codebook_setup->maxdepth > 3 * V_NB_BITS)
00415             codebook_setup->nb_bits = V_NB_BITS2;
00416         else
00417             codebook_setup->nb_bits = V_NB_BITS;
00418 
00419         codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
00420 
00421         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)) {
00422             av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
00423             goto error;
00424         }
00425     }
00426 
00427     av_free(tmp_vlc_bits);
00428     av_free(tmp_vlc_codes);
00429     av_free(codebook_multiplicands);
00430     return 0;
00431 
00432 // Error:
00433 error:
00434     av_free(tmp_vlc_bits);
00435     av_free(tmp_vlc_codes);
00436     av_free(codebook_multiplicands);
00437     return -1;
00438 }
00439 
00440 // Process time domain transforms part (unused in Vorbis I)
00441 
00442 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
00443 {
00444     GetBitContext *gb = &vc->gb;
00445     unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
00446 
00447     for (i = 0; i < vorbis_time_count; ++i) {
00448         unsigned vorbis_tdtransform = get_bits(gb, 16);
00449 
00450         av_dlog(NULL, " Vorbis time domain transform %u: %u\n",
00451                 vorbis_time_count, vorbis_tdtransform);
00452 
00453         if (vorbis_tdtransform) {
00454             av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
00455             return -1;
00456         }
00457     }
00458     return 0;
00459 }
00460 
00461 // Process floors part
00462 
00463 static int vorbis_floor0_decode(vorbis_context *vc,
00464                                 vorbis_floor_data *vfu, float *vec);
00465 static void create_map(vorbis_context *vc, unsigned floor_number);
00466 static int vorbis_floor1_decode(vorbis_context *vc,
00467                                 vorbis_floor_data *vfu, float *vec);
00468 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
00469 {
00470     GetBitContext *gb = &vc->gb;
00471     int i,j,k;
00472 
00473     vc->floor_count = get_bits(gb, 6) + 1;
00474 
00475     vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
00476 
00477     for (i = 0; i < vc->floor_count; ++i) {
00478         vorbis_floor *floor_setup = &vc->floors[i];
00479 
00480         floor_setup->floor_type = get_bits(gb, 16);
00481 
00482         av_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);
00483 
00484         if (floor_setup->floor_type == 1) {
00485             int maximum_class = -1;
00486             unsigned rangebits, rangemax, floor1_values = 2;
00487 
00488             floor_setup->decode = vorbis_floor1_decode;
00489 
00490             floor_setup->data.t1.partitions = get_bits(gb, 5);
00491 
00492             av_dlog(NULL, " %d.floor: %d partitions \n",
00493                     i, floor_setup->data.t1.partitions);
00494 
00495             for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
00496                 floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
00497                 if (floor_setup->data.t1.partition_class[j] > maximum_class)
00498                     maximum_class = floor_setup->data.t1.partition_class[j];
00499 
00500                 av_dlog(NULL, " %d. floor %d partition class %d \n",
00501                         i, j, floor_setup->data.t1.partition_class[j]);
00502 
00503             }
00504 
00505             av_dlog(NULL, " maximum class %d \n", maximum_class);
00506 
00507             for (j = 0; j <= maximum_class; ++j) {
00508                 floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
00509                 floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
00510 
00511                 av_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,
00512                         floor_setup->data.t1.class_dimensions[j],
00513                         floor_setup->data.t1.class_subclasses[j]);
00514 
00515                 if (floor_setup->data.t1.class_subclasses[j]) {
00516                     GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
00517 
00518                     av_dlog(NULL, "   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
00519                 }
00520 
00521                 for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
00522                     int16_t bits = get_bits(gb, 8) - 1;
00523                     if (bits != -1)
00524                         VALIDATE_INDEX(bits, vc->codebook_count)
00525                     floor_setup->data.t1.subclass_books[j][k] = bits;
00526 
00527                     av_dlog(NULL, "    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
00528                 }
00529             }
00530 
00531             floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
00532             floor_setup->data.t1.x_list_dim = 2;
00533 
00534             for (j = 0; j < floor_setup->data.t1.partitions; ++j)
00535                 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
00536 
00537             floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim *
00538                                                    sizeof(*floor_setup->data.t1.list));
00539 
00540 
00541             rangebits = get_bits(gb, 4);
00542             rangemax = (1 << rangebits);
00543             if (rangemax > vc->blocksize[1] / 2) {
00544                 av_log(vc->avccontext, AV_LOG_ERROR,
00545                        "Floor value is too large for blocksize: %u (%"PRIu32")\n",
00546                        rangemax, vc->blocksize[1] / 2);
00547                 return -1;
00548             }
00549             floor_setup->data.t1.list[0].x = 0;
00550             floor_setup->data.t1.list[1].x = rangemax;
00551 
00552             for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
00553                 for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
00554                     floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
00555 
00556                     av_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,
00557                             floor_setup->data.t1.list[floor1_values].x);
00558                 }
00559             }
00560 
00561 // Precalculate order of x coordinates - needed for decode
00562             ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);
00563         } else if (floor_setup->floor_type == 0) {
00564             unsigned max_codebook_dim = 0;
00565 
00566             floor_setup->decode = vorbis_floor0_decode;
00567 
00568             floor_setup->data.t0.order          = get_bits(gb,  8);
00569             floor_setup->data.t0.rate           = get_bits(gb, 16);
00570             floor_setup->data.t0.bark_map_size  = get_bits(gb, 16);
00571             floor_setup->data.t0.amplitude_bits = get_bits(gb,  6);
00572             /* zero would result in a div by zero later *
00573              * 2^0 - 1 == 0                             */
00574             if (floor_setup->data.t0.amplitude_bits == 0) {
00575                 av_log(vc->avccontext, AV_LOG_ERROR,
00576                        "Floor 0 amplitude bits is 0.\n");
00577                 return -1;
00578             }
00579             floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
00580             floor_setup->data.t0.num_books        = get_bits(gb, 4) + 1;
00581 
00582             /* allocate mem for booklist */
00583             floor_setup->data.t0.book_list =
00584                 av_malloc(floor_setup->data.t0.num_books);
00585             if (!floor_setup->data.t0.book_list)
00586                 return -1;
00587             /* read book indexes */
00588             {
00589                 int idx;
00590                 unsigned book_idx;
00591                 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
00592                     GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
00593                     floor_setup->data.t0.book_list[idx] = book_idx;
00594                     if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
00595                         max_codebook_dim = vc->codebooks[book_idx].dimensions;
00596                 }
00597             }
00598 
00599             create_map(vc, i);
00600 
00601             /* codebook dim is for padding if codebook dim doesn't *
00602              * divide order+1 then we need to read more data       */
00603             floor_setup->data.t0.lsp =
00604                 av_malloc((floor_setup->data.t0.order + 1 + max_codebook_dim)
00605                           * sizeof(*floor_setup->data.t0.lsp));
00606             if (!floor_setup->data.t0.lsp)
00607                 return -1;
00608 
00609             /* debug output parsed headers */
00610             av_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
00611             av_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
00612             av_dlog(NULL, "floor0 bark map size: %u\n",
00613                     floor_setup->data.t0.bark_map_size);
00614             av_dlog(NULL, "floor0 amplitude bits: %u\n",
00615                     floor_setup->data.t0.amplitude_bits);
00616             av_dlog(NULL, "floor0 amplitude offset: %u\n",
00617                     floor_setup->data.t0.amplitude_offset);
00618             av_dlog(NULL, "floor0 number of books: %u\n",
00619                     floor_setup->data.t0.num_books);
00620             av_dlog(NULL, "floor0 book list pointer: %p\n",
00621                     floor_setup->data.t0.book_list);
00622             {
00623                 int idx;
00624                 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
00625                     av_dlog(NULL, "  Book %d: %u\n", idx + 1,
00626                             floor_setup->data.t0.book_list[idx]);
00627                 }
00628             }
00629         } else {
00630             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
00631             return -1;
00632         }
00633     }
00634     return 0;
00635 }
00636 
00637 // Process residues part
00638 
00639 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
00640 {
00641     GetBitContext *gb = &vc->gb;
00642     unsigned i, j, k;
00643 
00644     vc->residue_count = get_bits(gb, 6)+1;
00645     vc->residues      = av_mallocz(vc->residue_count * sizeof(*vc->residues));
00646 
00647     av_dlog(NULL, " There are %d residues. \n", vc->residue_count);
00648 
00649     for (i = 0; i < vc->residue_count; ++i) {
00650         vorbis_residue *res_setup = &vc->residues[i];
00651         uint8_t cascade[64];
00652         unsigned high_bits, low_bits;
00653 
00654         res_setup->type = get_bits(gb, 16);
00655 
00656         av_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);
00657 
00658         res_setup->begin          = get_bits(gb, 24);
00659         res_setup->end            = get_bits(gb, 24);
00660         res_setup->partition_size = get_bits(gb, 24) + 1;
00661         /* Validations to prevent a buffer overflow later. */
00662         if (res_setup->begin>res_setup->end ||
00663             res_setup->end > vc->avccontext->channels * vc->blocksize[1] / 2 ||
00664             (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
00665             av_log(vc->avccontext, AV_LOG_ERROR,
00666                    "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",
00667                    res_setup->type, res_setup->begin, res_setup->end,
00668                    res_setup->partition_size, vc->blocksize[1] / 2);
00669             return -1;
00670         }
00671 
00672         res_setup->classifications = get_bits(gb, 6) + 1;
00673         GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
00674 
00675         res_setup->ptns_to_read =
00676             (res_setup->end - res_setup->begin) / res_setup->partition_size;
00677         res_setup->classifs = av_malloc(res_setup->ptns_to_read *
00678                                         vc->audio_channels *
00679                                         sizeof(*res_setup->classifs));
00680         if (!res_setup->classifs)
00681             return AVERROR(ENOMEM);
00682 
00683         av_dlog(NULL, "    begin %d end %d part.size %d classif.s %d classbook %d \n",
00684                 res_setup->begin, res_setup->end, res_setup->partition_size,
00685                 res_setup->classifications, res_setup->classbook);
00686 
00687         for (j = 0; j < res_setup->classifications; ++j) {
00688             high_bits = 0;
00689             low_bits  = get_bits(gb, 3);
00690             if (get_bits1(gb))
00691                 high_bits = get_bits(gb, 5);
00692             cascade[j] = (high_bits << 3) + low_bits;
00693 
00694             av_dlog(NULL, "     %u class cascade depth: %d\n", j, ilog(cascade[j]));
00695         }
00696 
00697         res_setup->maxpass = 0;
00698         for (j = 0; j < res_setup->classifications; ++j) {
00699             for (k = 0; k < 8; ++k) {
00700                 if (cascade[j]&(1 << k)) {
00701                     GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
00702 
00703                     av_dlog(NULL, "     %u class cascade depth %u book: %d\n",
00704                             j, k, res_setup->books[j][k]);
00705 
00706                     if (k>res_setup->maxpass)
00707                         res_setup->maxpass = k;
00708                 } else {
00709                     res_setup->books[j][k] = -1;
00710                 }
00711             }
00712         }
00713     }
00714     return 0;
00715 }
00716 
00717 // Process mappings part
00718 
00719 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
00720 {
00721     GetBitContext *gb = &vc->gb;
00722     unsigned i, j;
00723 
00724     vc->mapping_count = get_bits(gb, 6)+1;
00725     vc->mappings      = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
00726 
00727     av_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);
00728 
00729     for (i = 0; i < vc->mapping_count; ++i) {
00730         vorbis_mapping *mapping_setup = &vc->mappings[i];
00731 
00732         if (get_bits(gb, 16)) {
00733             av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
00734             return -1;
00735         }
00736         if (get_bits1(gb)) {
00737             mapping_setup->submaps = get_bits(gb, 4) + 1;
00738         } else {
00739             mapping_setup->submaps = 1;
00740         }
00741 
00742         if (get_bits1(gb)) {
00743             mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
00744             mapping_setup->magnitude      = av_mallocz(mapping_setup->coupling_steps *
00745                                                        sizeof(*mapping_setup->magnitude));
00746             mapping_setup->angle          = av_mallocz(mapping_setup->coupling_steps *
00747                                                        sizeof(*mapping_setup->angle));
00748             for (j = 0; j < mapping_setup->coupling_steps; ++j) {
00749                 GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
00750                 GET_VALIDATED_INDEX(mapping_setup->angle[j],     ilog(vc->audio_channels - 1), vc->audio_channels)
00751             }
00752         } else {
00753             mapping_setup->coupling_steps = 0;
00754         }
00755 
00756         av_dlog(NULL, "   %u mapping coupling steps: %d\n",
00757                 i, mapping_setup->coupling_steps);
00758 
00759         if (get_bits(gb, 2)) {
00760             av_log(vc->avccontext, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
00761             return -1; // following spec.
00762         }
00763 
00764         if (mapping_setup->submaps>1) {
00765             mapping_setup->mux = av_mallocz(vc->audio_channels *
00766                                             sizeof(*mapping_setup->mux));
00767             for (j = 0; j < vc->audio_channels; ++j)
00768                 mapping_setup->mux[j] = get_bits(gb, 4);
00769         }
00770 
00771         for (j = 0; j < mapping_setup->submaps; ++j) {
00772             skip_bits(gb, 8); // FIXME check?
00773             GET_VALIDATED_INDEX(mapping_setup->submap_floor[j],   8, vc->floor_count)
00774             GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
00775 
00776             av_dlog(NULL, "   %u mapping %u submap : floor %d, residue %d\n", i, j,
00777                     mapping_setup->submap_floor[j],
00778                     mapping_setup->submap_residue[j]);
00779         }
00780     }
00781     return 0;
00782 }
00783 
00784 // Process modes part
00785 
00786 static void create_map(vorbis_context *vc, unsigned floor_number)
00787 {
00788     vorbis_floor *floors = vc->floors;
00789     vorbis_floor0 *vf;
00790     int idx;
00791     int blockflag, n;
00792     int32_t *map;
00793 
00794     for (blockflag = 0; blockflag < 2; ++blockflag) {
00795         n = vc->blocksize[blockflag] / 2;
00796         floors[floor_number].data.t0.map[blockflag] =
00797             av_malloc((n + 1) * sizeof(int32_t)); // n + sentinel
00798 
00799         map =  floors[floor_number].data.t0.map[blockflag];
00800         vf  = &floors[floor_number].data.t0;
00801 
00802         for (idx = 0; idx < n; ++idx) {
00803             map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
00804                              ((vf->bark_map_size) /
00805                               BARK(vf->rate / 2.0f)));
00806             if (vf->bark_map_size-1 < map[idx])
00807                 map[idx] = vf->bark_map_size - 1;
00808         }
00809         map[n] = -1;
00810         vf->map_size[blockflag] = n;
00811     }
00812 
00813     for (idx = 0; idx <= n; ++idx) {
00814         av_dlog(NULL, "floor0 map: map at pos %d is %d\n", idx, map[idx]);
00815     }
00816 }
00817 
00818 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
00819 {
00820     GetBitContext *gb = &vc->gb;
00821     unsigned i;
00822 
00823     vc->mode_count = get_bits(gb, 6) + 1;
00824     vc->modes      = av_mallocz(vc->mode_count * sizeof(*vc->modes));
00825 
00826     av_dlog(NULL, " There are %d modes.\n", vc->mode_count);
00827 
00828     for (i = 0; i < vc->mode_count; ++i) {
00829         vorbis_mode *mode_setup = &vc->modes[i];
00830 
00831         mode_setup->blockflag     = get_bits1(gb);
00832         mode_setup->windowtype    = get_bits(gb, 16); //FIXME check
00833         mode_setup->transformtype = get_bits(gb, 16); //FIXME check
00834         GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
00835 
00836         av_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
00837                 i, mode_setup->blockflag, mode_setup->windowtype,
00838                 mode_setup->transformtype, mode_setup->mapping);
00839     }
00840     return 0;
00841 }
00842 
00843 // Process the whole setup header using the functions above
00844 
00845 static int vorbis_parse_setup_hdr(vorbis_context *vc)
00846 {
00847     GetBitContext *gb = &vc->gb;
00848 
00849     if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
00850         (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
00851         (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
00852         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
00853         return -1;
00854     }
00855 
00856     if (vorbis_parse_setup_hdr_codebooks(vc)) {
00857         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
00858         return -2;
00859     }
00860     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {
00861         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
00862         return -3;
00863     }
00864     if (vorbis_parse_setup_hdr_floors(vc)) {
00865         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
00866         return -4;
00867     }
00868     if (vorbis_parse_setup_hdr_residues(vc)) {
00869         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
00870         return -5;
00871     }
00872     if (vorbis_parse_setup_hdr_mappings(vc)) {
00873         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
00874         return -6;
00875     }
00876     if (vorbis_parse_setup_hdr_modes(vc)) {
00877         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
00878         return -7;
00879     }
00880     if (!get_bits1(gb)) {
00881         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
00882         return -8; // framing flag bit unset error
00883     }
00884 
00885     return 0;
00886 }
00887 
00888 // Process the identification header
00889 
00890 static int vorbis_parse_id_hdr(vorbis_context *vc)
00891 {
00892     GetBitContext *gb = &vc->gb;
00893     unsigned bl0, bl1;
00894 
00895     if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
00896         (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
00897         (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
00898         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
00899         return -1;
00900     }
00901 
00902     vc->version        = get_bits_long(gb, 32);    //FIXME check 0
00903     vc->audio_channels = get_bits(gb, 8);
00904     if (vc->audio_channels <= 0) {
00905         av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
00906         return -1;
00907     }
00908     vc->audio_samplerate = get_bits_long(gb, 32);
00909     if (vc->audio_samplerate <= 0) {
00910         av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
00911         return -1;
00912     }
00913     vc->bitrate_maximum = get_bits_long(gb, 32);
00914     vc->bitrate_nominal = get_bits_long(gb, 32);
00915     vc->bitrate_minimum = get_bits_long(gb, 32);
00916     bl0 = get_bits(gb, 4);
00917     bl1 = get_bits(gb, 4);
00918     vc->blocksize[0] = (1 << bl0);
00919     vc->blocksize[1] = (1 << bl1);
00920     if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
00921         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
00922         return -3;
00923     }
00924     // output format int16
00925     if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) {
00926         av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "
00927                "output packets too large.\n");
00928         return -4;
00929     }
00930     vc->win[0] = ff_vorbis_vwin[bl0 - 6];
00931     vc->win[1] = ff_vorbis_vwin[bl1 - 6];
00932 
00933     if ((get_bits1(gb)) == 0) {
00934         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
00935         return -2;
00936     }
00937 
00938     vc->channel_residues =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(*vc->channel_residues));
00939     vc->channel_floors   =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(*vc->channel_floors));
00940     vc->saved            =  av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(*vc->saved));
00941     vc->previous_window  = 0;
00942 
00943     ff_mdct_init(&vc->mdct[0], bl0, 1, -vc->scale_bias);
00944     ff_mdct_init(&vc->mdct[1], bl1, 1, -vc->scale_bias);
00945 
00946     av_dlog(NULL, " vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",
00947             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
00948 
00949 /*
00950     BLK = vc->blocksize[0];
00951     for (i = 0; i < BLK / 2; ++i) {
00952         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)));
00953     }
00954 */
00955 
00956     return 0;
00957 }
00958 
00959 // Process the extradata using the functions above (identification header, setup header)
00960 
00961 static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
00962 {
00963     vorbis_context *vc = avccontext->priv_data ;
00964     uint8_t *headers   = avccontext->extradata;
00965     int headers_len    = avccontext->extradata_size;
00966     uint8_t *header_start[3];
00967     int header_len[3];
00968     GetBitContext *gb = &(vc->gb);
00969     int hdr_type;
00970 
00971     vc->avccontext = avccontext;
00972     dsputil_init(&vc->dsp, avccontext);
00973     ff_fmt_convert_init(&vc->fmt_conv, avccontext);
00974 
00975     if (avccontext->request_sample_fmt == AV_SAMPLE_FMT_FLT) {
00976         avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;
00977         vc->scale_bias = 1.0f;
00978     } else {
00979         avccontext->sample_fmt = AV_SAMPLE_FMT_S16;
00980         vc->scale_bias = 32768.0f;
00981     }
00982 
00983     if (!headers_len) {
00984         av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");
00985         return -1;
00986     }
00987 
00988     if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {
00989         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
00990         return -1;
00991     }
00992 
00993     init_get_bits(gb, header_start[0], header_len[0]*8);
00994     hdr_type = get_bits(gb, 8);
00995     if (hdr_type != 1) {
00996         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
00997         return -1;
00998     }
00999     if (vorbis_parse_id_hdr(vc)) {
01000         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
01001         vorbis_free(vc);
01002         return -1;
01003     }
01004 
01005     init_get_bits(gb, header_start[2], header_len[2]*8);
01006     hdr_type = get_bits(gb, 8);
01007     if (hdr_type != 5) {
01008         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");
01009         vorbis_free(vc);
01010         return -1;
01011     }
01012     if (vorbis_parse_setup_hdr(vc)) {
01013         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
01014         vorbis_free(vc);
01015         return -1;
01016     }
01017 
01018     if (vc->audio_channels > 8)
01019         avccontext->channel_layout = 0;
01020     else
01021         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
01022 
01023     avccontext->channels    = vc->audio_channels;
01024     avccontext->sample_rate = vc->audio_samplerate;
01025     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
01026 
01027     return 0 ;
01028 }
01029 
01030 // Decode audiopackets -------------------------------------------------
01031 
01032 // Read and decode floor
01033 
01034 static int vorbis_floor0_decode(vorbis_context *vc,
01035                                 vorbis_floor_data *vfu, float *vec)
01036 {
01037     vorbis_floor0 *vf = &vfu->t0;
01038     float *lsp = vf->lsp;
01039     unsigned amplitude, book_idx;
01040     unsigned blockflag = vc->modes[vc->mode_number].blockflag;
01041 
01042     amplitude = get_bits(&vc->gb, vf->amplitude_bits);
01043     if (amplitude > 0) {
01044         float last = 0;
01045         unsigned idx, lsp_len = 0;
01046         vorbis_codebook codebook;
01047 
01048         book_idx = get_bits(&vc->gb, ilog(vf->num_books));
01049         if (book_idx >= vf->num_books) {
01050             av_log(vc->avccontext, AV_LOG_ERROR,
01051                     "floor0 dec: booknumber too high!\n");
01052             book_idx =  0;
01053         }
01054         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
01055         codebook = vc->codebooks[vf->book_list[book_idx]];
01056         /* Invalid codebook! */
01057         if (!codebook.codevectors)
01058             return -1;
01059 
01060         while (lsp_len<vf->order) {
01061             int vec_off;
01062 
01063             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
01064             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);
01065             /* read temp vector */
01066             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
01067                                codebook.nb_bits, codebook.maxdepth)
01068                       * codebook.dimensions;
01069             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);
01070             /* copy each vector component and add last to it */
01071             for (idx = 0; idx < codebook.dimensions; ++idx)
01072                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
01073             last = lsp[lsp_len+idx-1]; /* set last to last vector component */
01074 
01075             lsp_len += codebook.dimensions;
01076         }
01077         /* DEBUG: output lsp coeffs */
01078         {
01079             int idx;
01080             for (idx = 0; idx < lsp_len; ++idx)
01081                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
01082         }
01083 
01084         /* synthesize floor output vector */
01085         {
01086             int i;
01087             int order = vf->order;
01088             float wstep = M_PI / vf->bark_map_size;
01089 
01090             for (i = 0; i < order; i++)
01091                 lsp[i] = 2.0f * cos(lsp[i]);
01092 
01093             av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
01094                     vf->map_size[blockflag], order, wstep);
01095 
01096             i = 0;
01097             while (i < vf->map_size[blockflag]) {
01098                 int j, iter_cond = vf->map[blockflag][i];
01099                 float p = 0.5f;
01100                 float q = 0.5f;
01101                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
01102 
01103                 /* similar part for the q and p products */
01104                 for (j = 0; j + 1 < order; j += 2) {
01105                     q *= lsp[j]     - two_cos_w;
01106                     p *= lsp[j + 1] - two_cos_w;
01107                 }
01108                 if (j == order) { // even order
01109                     p *= p * (2.0f - two_cos_w);
01110                     q *= q * (2.0f + two_cos_w);
01111                 } else { // odd order
01112                     q *= two_cos_w-lsp[j]; // one more time for q
01113 
01114                     /* final step and square */
01115                     p *= p * (4.f - two_cos_w * two_cos_w);
01116                     q *= q;
01117                 }
01118 
01119                 /* calculate linear floor value */
01120                 q = exp((((amplitude*vf->amplitude_offset) /
01121                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
01122                          - vf->amplitude_offset) * .11512925f);
01123 
01124                 /* fill vector */
01125                 do {
01126                     vec[i] = q; ++i;
01127                 } while (vf->map[blockflag][i] == iter_cond);
01128             }
01129         }
01130     } else {
01131         /* this channel is unused */
01132         return 1;
01133     }
01134 
01135     av_dlog(NULL, " Floor0 decoded\n");
01136 
01137     return 0;
01138 }
01139 
01140 static int vorbis_floor1_decode(vorbis_context *vc,
01141                                 vorbis_floor_data *vfu, float *vec)
01142 {
01143     vorbis_floor1 *vf = &vfu->t1;
01144     GetBitContext *gb = &vc->gb;
01145     uint16_t range_v[4] = { 256, 128, 86, 64 };
01146     unsigned range = range_v[vf->multiplier - 1];
01147     uint16_t floor1_Y[258];
01148     uint16_t floor1_Y_final[258];
01149     int floor1_flag[258];
01150     unsigned class, cdim, cbits, csub, cval, offset, i, j;
01151     int book, adx, ady, dy, off, predicted, err;
01152 
01153 
01154     if (!get_bits1(gb)) // silence
01155         return 1;
01156 
01157 // Read values (or differences) for the floor's points
01158 
01159     floor1_Y[0] = get_bits(gb, ilog(range - 1));
01160     floor1_Y[1] = get_bits(gb, ilog(range - 1));
01161 
01162     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
01163 
01164     offset = 2;
01165     for (i = 0; i < vf->partitions; ++i) {
01166         class = vf->partition_class[i];
01167         cdim   = vf->class_dimensions[class];
01168         cbits  = vf->class_subclasses[class];
01169         csub = (1 << cbits) - 1;
01170         cval = 0;
01171 
01172         av_dlog(NULL, "Cbits %u\n", cbits);
01173 
01174         if (cbits) // this reads all subclasses for this partition's class
01175             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,
01176                             vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);
01177 
01178         for (j = 0; j < cdim; ++j) {
01179             book = vf->subclass_books[class][cval & csub];
01180 
01181             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",
01182                     book, cbits, cval, get_bits_count(gb));
01183 
01184             cval = cval >> cbits;
01185             if (book > -1) {
01186                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
01187                 vc->codebooks[book].nb_bits, 3);
01188             } else {
01189                 floor1_Y[offset+j] = 0;
01190             }
01191 
01192             av_dlog(NULL, " floor(%d) = %d \n",
01193                     vf->list[offset+j].x, floor1_Y[offset+j]);
01194         }
01195         offset+=cdim;
01196     }
01197 
01198 // Amplitude calculation from the differences
01199 
01200     floor1_flag[0] = 1;
01201     floor1_flag[1] = 1;
01202     floor1_Y_final[0] = floor1_Y[0];
01203     floor1_Y_final[1] = floor1_Y[1];
01204 
01205     for (i = 2; i < vf->x_list_dim; ++i) {
01206         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
01207 
01208         low_neigh_offs  = vf->list[i].low;
01209         high_neigh_offs = vf->list[i].high;
01210         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin
01211         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
01212         ady = FFABS(dy);
01213         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
01214         off = err / adx;
01215         if (dy < 0) {
01216             predicted = floor1_Y_final[low_neigh_offs] - off;
01217         } else {
01218             predicted = floor1_Y_final[low_neigh_offs] + off;
01219         } // render_point end
01220 
01221         val = floor1_Y[i];
01222         highroom = range-predicted;
01223         lowroom  = predicted;
01224         if (highroom < lowroom) {
01225             room = highroom * 2;
01226         } else {
01227             room = lowroom * 2;   // SPEC mispelling
01228         }
01229         if (val) {
01230             floor1_flag[low_neigh_offs]  = 1;
01231             floor1_flag[high_neigh_offs] = 1;
01232             floor1_flag[i]               = 1;
01233             if (val >= room) {
01234                 if (highroom > lowroom) {
01235                     floor1_Y_final[i] = val - lowroom + predicted;
01236                 } else {
01237                     floor1_Y_final[i] = predicted - val + highroom - 1;
01238                 }
01239             } else {
01240                 if (val & 1) {
01241                     floor1_Y_final[i] = predicted - (val + 1) / 2;
01242                 } else {
01243                     floor1_Y_final[i] = predicted + val / 2;
01244                 }
01245             }
01246         } else {
01247             floor1_flag[i]    = 0;
01248             floor1_Y_final[i] = predicted;
01249         }
01250 
01251         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",
01252                 vf->list[i].x, floor1_Y_final[i], val);
01253     }
01254 
01255 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
01256 
01257     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
01258 
01259     av_dlog(NULL, " Floor decoded\n");
01260 
01261     return 0;
01262 }
01263 
01264 // Read and decode residue
01265 
01266 static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
01267                                                            vorbis_residue *vr,
01268                                                            unsigned ch,
01269                                                            uint8_t *do_not_decode,
01270                                                            float *vec,
01271                                                            unsigned vlen,
01272                                                            int vr_type)
01273 {
01274     GetBitContext *gb = &vc->gb;
01275     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;
01276     unsigned ptns_to_read = vr->ptns_to_read;
01277     uint8_t *classifs = vr->classifs;
01278     unsigned pass, ch_used, i, j, k, l;
01279 
01280     if (vr_type == 2) {
01281         for (j = 1; j < ch; ++j)
01282             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input
01283         if (do_not_decode[0])
01284             return 0;
01285         ch_used = 1;
01286     } else {
01287         ch_used = ch;
01288     }
01289 
01290     av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
01291 
01292     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
01293         uint16_t voffset, partition_count, j_times_ptns_to_read;
01294 
01295         voffset = vr->begin;
01296         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error
01297             if (!pass) {
01298                 unsigned inverse_class = ff_inverse[vr->classifications];
01299                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
01300                     if (!do_not_decode[j]) {
01301                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
01302                                                  vc->codebooks[vr->classbook].nb_bits, 3);
01303 
01304                         av_dlog(NULL, "Classword: %u\n", temp);
01305 
01306                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
01307                         for (i = 0; i < c_p_c; ++i) {
01308                             unsigned temp2;
01309 
01310                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;
01311                             if (partition_count + c_p_c - 1 - i < ptns_to_read)
01312                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
01313                             temp = temp2;
01314                         }
01315                     }
01316                     j_times_ptns_to_read += ptns_to_read;
01317                 }
01318             }
01319             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
01320                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
01321                     unsigned voffs;
01322 
01323                     if (!do_not_decode[j]) {
01324                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
01325                         int vqbook  = vr->books[vqclass][pass];
01326 
01327                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
01328                             unsigned coffs;
01329                             unsigned dim  = vc->codebooks[vqbook].dimensions;
01330                             unsigned step = dim == 1 ? vr->partition_size
01331                                                      : FASTDIV(vr->partition_size, dim);
01332                             vorbis_codebook codebook = vc->codebooks[vqbook];
01333 
01334                             if (vr_type == 0) {
01335 
01336                                 voffs = voffset+j*vlen;
01337                                 for (k = 0; k < step; ++k) {
01338                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
01339                                     for (l = 0; l < dim; ++l)
01340                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH
01341                                 }
01342                             } else if (vr_type == 1) {
01343                                 voffs = voffset + j * vlen;
01344                                 for (k = 0; k < step; ++k) {
01345                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
01346                                     for (l = 0; l < dim; ++l, ++voffs) {
01347                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
01348 
01349                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d  \n",
01350                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
01351                                     }
01352                                 }
01353                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
01354                                 voffs = voffset >> 1;
01355 
01356                                 if (dim == 2) {
01357                                     for (k = 0; k < step; ++k) {
01358                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
01359                                         vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH
01360                                         vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH
01361                                     }
01362                                 } else if (dim == 4) {
01363                                     for (k = 0; k < step; ++k, voffs += 2) {
01364                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
01365                                         vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH
01366                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH
01367                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH
01368                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH
01369                                     }
01370                                 } else
01371                                 for (k = 0; k < step; ++k) {
01372                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
01373                                     for (l = 0; l < dim; l += 2, voffs++) {
01374                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH
01375                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH
01376 
01377                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",
01378                                                 pass, voffset / ch + (voffs % ch) * vlen,
01379                                                 vec[voffset / ch + (voffs % ch) * vlen],
01380                                                 codebook.codevectors[coffs + l], coffs, l);
01381                                     }
01382                                 }
01383 
01384                             } else if (vr_type == 2) {
01385                                 voffs = voffset;
01386 
01387                                 for (k = 0; k < step; ++k) {
01388                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
01389                                     for (l = 0; l < dim; ++l, ++voffs) {
01390                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %
01391 
01392                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",
01393                                                 pass, voffset / ch + (voffs % ch) * vlen,
01394                                                 vec[voffset / ch + (voffs % ch) * vlen],
01395                                                 codebook.codevectors[coffs + l], coffs, l);
01396                                     }
01397                                 }
01398                             }
01399                         }
01400                     }
01401                     j_times_ptns_to_read += ptns_to_read;
01402                 }
01403                 ++partition_count;
01404                 voffset += vr->partition_size;
01405             }
01406         }
01407     }
01408     return 0;
01409 }
01410 
01411 static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
01412                                         unsigned ch,
01413                                         uint8_t *do_not_decode,
01414                                         float *vec, unsigned vlen)
01415 {
01416     if (vr->type == 2)
01417         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);
01418     else if (vr->type == 1)
01419         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);
01420     else if (vr->type == 0)
01421         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);
01422     else {
01423         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");
01424         return -1;
01425     }
01426 }
01427 
01428 void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)
01429 {
01430     int i;
01431     for (i = 0;  i < blocksize;  i++) {
01432         if (mag[i] > 0.0) {
01433             if (ang[i] > 0.0) {
01434                 ang[i] = mag[i] - ang[i];
01435             } else {
01436                 float temp = ang[i];
01437                 ang[i]     = mag[i];
01438                 mag[i]    += temp;
01439             }
01440         } else {
01441             if (ang[i] > 0.0) {
01442                 ang[i] += mag[i];
01443             } else {
01444                 float temp = ang[i];
01445                 ang[i]     = mag[i];
01446                 mag[i]    -= temp;
01447             }
01448         }
01449     }
01450 }
01451 
01452 // Decode the audio packet using the functions above
01453 
01454 static int vorbis_parse_audio_packet(vorbis_context *vc)
01455 {
01456     GetBitContext *gb = &vc->gb;
01457     FFTContext *mdct;
01458     unsigned previous_window = vc->previous_window;
01459     unsigned mode_number, blockflag, blocksize;
01460     int i, j;
01461     uint8_t no_residue[255];
01462     uint8_t do_not_decode[255];
01463     vorbis_mapping *mapping;
01464     float *ch_res_ptr   = vc->channel_residues;
01465     float *ch_floor_ptr = vc->channel_floors;
01466     uint8_t res_chan[255];
01467     unsigned res_num = 0;
01468     int retlen  = 0;
01469 
01470     if (get_bits1(gb)) {
01471         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
01472         return -1; // packet type not audio
01473     }
01474 
01475     if (vc->mode_count == 1) {
01476         mode_number = 0;
01477     } else {
01478         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
01479     }
01480     vc->mode_number = mode_number;
01481     mapping = &vc->mappings[vc->modes[mode_number].mapping];
01482 
01483     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
01484             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
01485 
01486     blockflag = vc->modes[mode_number].blockflag;
01487     blocksize = vc->blocksize[blockflag];
01488     if (blockflag)
01489         skip_bits(gb, 2); // previous_window, next_window
01490 
01491     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
01492     memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?
01493 
01494 // Decode floor
01495 
01496     for (i = 0; i < vc->audio_channels; ++i) {
01497         vorbis_floor *floor;
01498         int ret;
01499         if (mapping->submaps > 1) {
01500             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
01501         } else {
01502             floor = &vc->floors[mapping->submap_floor[0]];
01503         }
01504 
01505         ret = floor->decode(vc, &floor->data, ch_floor_ptr);
01506 
01507         if (ret < 0) {
01508             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
01509             return -1;
01510         }
01511         no_residue[i] = ret;
01512         ch_floor_ptr += blocksize / 2;
01513     }
01514 
01515 // Nonzero vector propagate
01516 
01517     for (i = mapping->coupling_steps - 1; i >= 0; --i) {
01518         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
01519             no_residue[mapping->magnitude[i]] = 0;
01520             no_residue[mapping->angle[i]]     = 0;
01521         }
01522     }
01523 
01524 // Decode residue
01525 
01526     for (i = 0; i < mapping->submaps; ++i) {
01527         vorbis_residue *residue;
01528         unsigned ch = 0;
01529 
01530         for (j = 0; j < vc->audio_channels; ++j) {
01531             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
01532                 res_chan[j] = res_num;
01533                 if (no_residue[j]) {
01534                     do_not_decode[ch] = 1;
01535                 } else {
01536                     do_not_decode[ch] = 0;
01537                 }
01538                 ++ch;
01539                 ++res_num;
01540             }
01541         }
01542         residue = &vc->residues[mapping->submap_residue[i]];
01543         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);
01544 
01545         ch_res_ptr += ch * blocksize / 2;
01546     }
01547 
01548 // Inverse coupling
01549 
01550     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
01551         float *mag, *ang;
01552 
01553         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
01554         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;
01555         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
01556     }
01557 
01558 // Dotproduct, MDCT
01559 
01560     mdct = &vc->mdct[blockflag];
01561 
01562     for (j = vc->audio_channels-1;j >= 0; j--) {
01563         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;
01564         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;
01565         vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);
01566         mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);
01567     }
01568 
01569 // Overlap/add, save data for next overlapping  FPMATH
01570 
01571     retlen = (blocksize + vc->blocksize[previous_window]) / 4;
01572     for (j = 0; j < vc->audio_channels; j++) {
01573         unsigned bs0 = vc->blocksize[0];
01574         unsigned bs1 = vc->blocksize[1];
01575         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;
01576         float *saved      = vc->saved + j * bs1 / 4;
01577         float *ret        = vc->channel_floors + j * retlen;
01578         float *buf        = residue;
01579         const float *win  = vc->win[blockflag & previous_window];
01580 
01581         if (blockflag == previous_window) {
01582             vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
01583         } else if (blockflag > previous_window) {
01584             vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
01585             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
01586         } else {
01587             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
01588             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
01589         }
01590         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
01591     }
01592 
01593     vc->previous_window = blockflag;
01594     return retlen;
01595 }
01596 
01597 // Return the decoded audio packet through the standard api
01598 
01599 static int vorbis_decode_frame(AVCodecContext *avccontext,
01600                                void *data, int *data_size,
01601                                AVPacket *avpkt)
01602 {
01603     const uint8_t *buf = avpkt->data;
01604     int buf_size       = avpkt->size;
01605     vorbis_context *vc = avccontext->priv_data ;
01606     GetBitContext *gb = &(vc->gb);
01607     const float *channel_ptrs[255];
01608     int i, len;
01609 
01610     if (!buf_size)
01611         return 0;
01612 
01613     av_dlog(NULL, "packet length %d \n", buf_size);
01614 
01615     init_get_bits(gb, buf, buf_size*8);
01616 
01617     len = vorbis_parse_audio_packet(vc);
01618 
01619     if (len <= 0) {
01620         *data_size = 0;
01621         return buf_size;
01622     }
01623 
01624     if (!vc->first_frame) {
01625         vc->first_frame = 1;
01626         *data_size = 0;
01627         return buf_size ;
01628     }
01629 
01630     av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
01631             get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
01632 
01633     if (vc->audio_channels > 8) {
01634         for (i = 0; i < vc->audio_channels; i++)
01635             channel_ptrs[i] = vc->channel_floors + i * len;
01636     } else {
01637         for (i = 0; i < vc->audio_channels; i++)
01638             channel_ptrs[i] = vc->channel_floors +
01639                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
01640     }
01641 
01642     if (avccontext->sample_fmt == AV_SAMPLE_FMT_FLT)
01643         vc->fmt_conv.float_interleave(data, channel_ptrs, len, vc->audio_channels);
01644     else
01645         vc->fmt_conv.float_to_int16_interleave(data, channel_ptrs, len,
01646                                                vc->audio_channels);
01647 
01648     *data_size = len * vc->audio_channels *
01649                  (av_get_bits_per_sample_fmt(avccontext->sample_fmt) / 8);
01650 
01651     return buf_size ;
01652 }
01653 
01654 // Close decoder
01655 
01656 static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
01657 {
01658     vorbis_context *vc = avccontext->priv_data;
01659 
01660     vorbis_free(vc);
01661 
01662     return 0 ;
01663 }
01664 
01665 AVCodec ff_vorbis_decoder = {
01666     "vorbis",
01667     AVMEDIA_TYPE_AUDIO,
01668     CODEC_ID_VORBIS,
01669     sizeof(vorbis_context),
01670     vorbis_decode_init,
01671     NULL,
01672     vorbis_decode_close,
01673     vorbis_decode_frame,
01674     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
01675     .channel_layouts = ff_vorbis_channel_layouts,
01676     .sample_fmts = (const enum AVSampleFormat[]) {
01677         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE
01678     },
01679 };
01680