libavcodec/vorbisdec.c
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00001 /*
00002  * This file is part of Libav.
00003  *
00004  * Libav is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU Lesser General Public
00006  * License as published by the Free Software Foundation; either
00007  * version 2.1 of the License, or (at your option) any later version.
00008  *
00009  * Libav is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * Lesser General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU Lesser General Public
00015  * License along with Libav; if not, write to the Free Software
00016  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00017  */
00018 
00025 #include <inttypes.h>
00026 #include <math.h>
00027 
00028 #define BITSTREAM_READER_LE
00029 #include "avcodec.h"
00030 #include "internal.h"
00031 #include "get_bits.h"
00032 #include "dsputil.h"
00033 #include "fft.h"
00034 #include "fmtconvert.h"
00035 
00036 #include "vorbis.h"
00037 #include "xiph.h"
00038 
00039 #define V_NB_BITS 8
00040 #define V_NB_BITS2 11
00041 #define V_MAX_VLCS (1 << 16)
00042 #define V_MAX_PARTITIONS (1 << 20)
00043 
00044 #undef NDEBUG
00045 #include <assert.h>
00046 
00047 typedef struct {
00048     uint8_t      dimensions;
00049     uint8_t      lookup_type;
00050     uint8_t      maxdepth;
00051     VLC          vlc;
00052     float       *codevectors;
00053     unsigned int nb_bits;
00054 } vorbis_codebook;
00055 
00056 typedef union  vorbis_floor_u  vorbis_floor_data;
00057 typedef struct vorbis_floor0_s vorbis_floor0;
00058 typedef struct vorbis_floor1_s vorbis_floor1;
00059 struct vorbis_context_s;
00060 typedef
00061 int (* vorbis_floor_decode_func)
00062     (struct vorbis_context_s *, vorbis_floor_data *, float *);
00063 typedef struct {
00064     uint8_t floor_type;
00065     vorbis_floor_decode_func decode;
00066     union vorbis_floor_u {
00067         struct vorbis_floor0_s {
00068             uint8_t       order;
00069             uint16_t      rate;
00070             uint16_t      bark_map_size;
00071             int32_t      *map[2];
00072             uint32_t      map_size[2];
00073             uint8_t       amplitude_bits;
00074             uint8_t       amplitude_offset;
00075             uint8_t       num_books;
00076             uint8_t      *book_list;
00077             float        *lsp;
00078         } t0;
00079         struct vorbis_floor1_s {
00080             uint8_t       partitions;
00081             uint8_t       partition_class[32];
00082             uint8_t       class_dimensions[16];
00083             uint8_t       class_subclasses[16];
00084             uint8_t       class_masterbook[16];
00085             int16_t       subclass_books[16][8];
00086             uint8_t       multiplier;
00087             uint16_t      x_list_dim;
00088             vorbis_floor1_entry *list;
00089         } t1;
00090     } data;
00091 } vorbis_floor;
00092 
00093 typedef struct {
00094     uint16_t      type;
00095     uint32_t      begin;
00096     uint32_t      end;
00097     unsigned      partition_size;
00098     uint8_t       classifications;
00099     uint8_t       classbook;
00100     int16_t       books[64][8];
00101     uint8_t       maxpass;
00102     uint16_t      ptns_to_read;
00103     uint8_t      *classifs;
00104 } vorbis_residue;
00105 
00106 typedef struct {
00107     uint8_t       submaps;
00108     uint16_t      coupling_steps;
00109     uint8_t      *magnitude;
00110     uint8_t      *angle;
00111     uint8_t      *mux;
00112     uint8_t       submap_floor[16];
00113     uint8_t       submap_residue[16];
00114 } vorbis_mapping;
00115 
00116 typedef struct {
00117     uint8_t       blockflag;
00118     uint16_t      windowtype;
00119     uint16_t      transformtype;
00120     uint8_t       mapping;
00121 } vorbis_mode;
00122 
00123 typedef struct vorbis_context_s {
00124     AVCodecContext *avccontext;
00125     AVFrame frame;
00126     GetBitContext gb;
00127     DSPContext dsp;
00128     FmtConvertContext fmt_conv;
00129 
00130     FFTContext mdct[2];
00131     uint8_t       first_frame;
00132     uint32_t      version;
00133     uint8_t       audio_channels;
00134     uint32_t      audio_samplerate;
00135     uint32_t      bitrate_maximum;
00136     uint32_t      bitrate_nominal;
00137     uint32_t      bitrate_minimum;
00138     uint32_t      blocksize[2];
00139     const float  *win[2];
00140     uint16_t      codebook_count;
00141     vorbis_codebook *codebooks;
00142     uint8_t       floor_count;
00143     vorbis_floor *floors;
00144     uint8_t       residue_count;
00145     vorbis_residue *residues;
00146     uint8_t       mapping_count;
00147     vorbis_mapping *mappings;
00148     uint8_t       mode_count;
00149     vorbis_mode  *modes;
00150     uint8_t       mode_number; // mode number for the current packet
00151     uint8_t       previous_window;
00152     float        *channel_residues;
00153     float        *channel_floors;
00154     float        *saved;
00155     float         scale_bias; // for float->int conversion
00156 } vorbis_context;
00157 
00158 /* Helper functions */
00159 
00160 #define BARK(x) \
00161     (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))
00162 
00163 static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";
00164 #define VALIDATE_INDEX(idx, limit) \
00165     if (idx >= limit) {\
00166         av_log(vc->avccontext, AV_LOG_ERROR,\
00167                idx_err_str,\
00168                (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\
00169         return AVERROR_INVALIDDATA;\
00170     }
00171 #define GET_VALIDATED_INDEX(idx, bits, limit) \
00172     {\
00173         idx = get_bits(gb, bits);\
00174         VALIDATE_INDEX(idx, limit)\
00175     }
00176 
00177 static float vorbisfloat2float(unsigned val)
00178 {
00179     double mant = val & 0x1fffff;
00180     long exp    = (val & 0x7fe00000L) >> 21;
00181     if (val & 0x80000000)
00182         mant = -mant;
00183     return ldexp(mant, exp - 20 - 768);
00184 }
00185 
00186 
00187 // Free all allocated memory -----------------------------------------
00188 
00189 static void vorbis_free(vorbis_context *vc)
00190 {
00191     int i;
00192 
00193     av_freep(&vc->channel_residues);
00194     av_freep(&vc->channel_floors);
00195     av_freep(&vc->saved);
00196 
00197     for (i = 0; i < vc->residue_count; i++)
00198         av_free(vc->residues[i].classifs);
00199     av_freep(&vc->residues);
00200     av_freep(&vc->modes);
00201 
00202     ff_mdct_end(&vc->mdct[0]);
00203     ff_mdct_end(&vc->mdct[1]);
00204 
00205     for (i = 0; i < vc->codebook_count; ++i) {
00206         av_free(vc->codebooks[i].codevectors);
00207         ff_free_vlc(&vc->codebooks[i].vlc);
00208     }
00209     av_freep(&vc->codebooks);
00210 
00211     for (i = 0; i < vc->floor_count; ++i) {
00212         if (vc->floors[i].floor_type == 0) {
00213             av_free(vc->floors[i].data.t0.map[0]);
00214             av_free(vc->floors[i].data.t0.map[1]);
00215             av_free(vc->floors[i].data.t0.book_list);
00216             av_free(vc->floors[i].data.t0.lsp);
00217         } else {
00218             av_free(vc->floors[i].data.t1.list);
00219         }
00220     }
00221     av_freep(&vc->floors);
00222 
00223     for (i = 0; i < vc->mapping_count; ++i) {
00224         av_free(vc->mappings[i].magnitude);
00225         av_free(vc->mappings[i].angle);
00226         av_free(vc->mappings[i].mux);
00227     }
00228     av_freep(&vc->mappings);
00229 }
00230 
00231 // Parse setup header -------------------------------------------------
00232 
00233 // Process codebooks part
00234 
00235 static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)
00236 {
00237     unsigned cb;
00238     uint8_t  *tmp_vlc_bits;
00239     uint32_t *tmp_vlc_codes;
00240     GetBitContext *gb = &vc->gb;
00241     uint16_t *codebook_multiplicands;
00242     int ret = 0;
00243 
00244     vc->codebook_count = get_bits(gb, 8) + 1;
00245 
00246     av_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);
00247 
00248     vc->codebooks = av_mallocz(vc->codebook_count * sizeof(*vc->codebooks));
00249     tmp_vlc_bits  = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));
00250     tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));
00251     codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));
00252 
00253     for (cb = 0; cb < vc->codebook_count; ++cb) {
00254         vorbis_codebook *codebook_setup = &vc->codebooks[cb];
00255         unsigned ordered, t, entries, used_entries = 0;
00256 
00257         av_dlog(NULL, " %u. Codebook\n", cb);
00258 
00259         if (get_bits(gb, 24) != 0x564342) {
00260             av_log(vc->avccontext, AV_LOG_ERROR,
00261                    " %u. Codebook setup data corrupt.\n", cb);
00262             ret = AVERROR_INVALIDDATA;
00263             goto error;
00264         }
00265 
00266         codebook_setup->dimensions=get_bits(gb, 16);
00267         if (codebook_setup->dimensions > 16 || codebook_setup->dimensions == 0) {
00268             av_log(vc->avccontext, AV_LOG_ERROR,
00269                    " %u. Codebook's dimension is invalid (%d).\n",
00270                    cb, codebook_setup->dimensions);
00271             ret = AVERROR_INVALIDDATA;
00272             goto error;
00273         }
00274         entries = get_bits(gb, 24);
00275         if (entries > V_MAX_VLCS) {
00276             av_log(vc->avccontext, AV_LOG_ERROR,
00277                    " %u. Codebook has too many entries (%u).\n",
00278                    cb, entries);
00279             ret = AVERROR_INVALIDDATA;
00280             goto error;
00281         }
00282 
00283         ordered = get_bits1(gb);
00284 
00285         av_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",
00286                 codebook_setup->dimensions, entries);
00287 
00288         if (!ordered) {
00289             unsigned ce, flag;
00290             unsigned sparse = get_bits1(gb);
00291 
00292             av_dlog(NULL, " not ordered \n");
00293 
00294             if (sparse) {
00295                 av_dlog(NULL, " sparse \n");
00296 
00297                 used_entries = 0;
00298                 for (ce = 0; ce < entries; ++ce) {
00299                     flag = get_bits1(gb);
00300                     if (flag) {
00301                         tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
00302                         ++used_entries;
00303                     } else
00304                         tmp_vlc_bits[ce] = 0;
00305                 }
00306             } else {
00307                 av_dlog(NULL, " not sparse \n");
00308 
00309                 used_entries = entries;
00310                 for (ce = 0; ce < entries; ++ce)
00311                     tmp_vlc_bits[ce] = get_bits(gb, 5) + 1;
00312             }
00313         } else {
00314             unsigned current_entry  = 0;
00315             unsigned current_length = get_bits(gb, 5) + 1;
00316 
00317             av_dlog(NULL, " ordered, current length: %u\n", current_length);  //FIXME
00318 
00319             used_entries = entries;
00320             for (; current_entry < used_entries && current_length <= 32; ++current_length) {
00321                 unsigned i, number;
00322 
00323                 av_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));
00324 
00325                 number = get_bits(gb, ilog(entries - current_entry));
00326 
00327                 av_dlog(NULL, " number: %u\n", number);
00328 
00329                 for (i = current_entry; i < number+current_entry; ++i)
00330                     if (i < used_entries)
00331                         tmp_vlc_bits[i] = current_length;
00332 
00333                 current_entry+=number;
00334             }
00335             if (current_entry>used_entries) {
00336                 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");
00337                 ret = AVERROR_INVALIDDATA;
00338                 goto error;
00339             }
00340         }
00341 
00342         codebook_setup->lookup_type = get_bits(gb, 4);
00343 
00344         av_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,
00345                 codebook_setup->lookup_type ? "vq" : "no lookup");
00346 
00347 // If the codebook is used for (inverse) VQ, calculate codevectors.
00348 
00349         if (codebook_setup->lookup_type == 1) {
00350             unsigned i, j, k;
00351             unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);
00352 
00353             float codebook_minimum_value = vorbisfloat2float(get_bits_long(gb, 32));
00354             float codebook_delta_value   = vorbisfloat2float(get_bits_long(gb, 32));
00355             unsigned codebook_value_bits = get_bits(gb, 4) + 1;
00356             unsigned codebook_sequence_p = get_bits1(gb);
00357 
00358             av_dlog(NULL, " We expect %d numbers for building the codevectors. \n",
00359                     codebook_lookup_values);
00360             av_dlog(NULL, "  delta %f minmum %f \n",
00361                     codebook_delta_value, codebook_minimum_value);
00362 
00363             for (i = 0; i < codebook_lookup_values; ++i) {
00364                 codebook_multiplicands[i] = get_bits(gb, codebook_value_bits);
00365 
00366                 av_dlog(NULL, " multiplicands*delta+minmum : %e \n",
00367                         (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);
00368                 av_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);
00369             }
00370 
00371 // Weed out unused vlcs and build codevector vector
00372             codebook_setup->codevectors = used_entries ? av_mallocz(used_entries *
00373                                                                     codebook_setup->dimensions *
00374                                                                     sizeof(*codebook_setup->codevectors))
00375                                                        : NULL;
00376             for (j = 0, i = 0; i < entries; ++i) {
00377                 unsigned dim = codebook_setup->dimensions;
00378 
00379                 if (tmp_vlc_bits[i]) {
00380                     float last = 0.0;
00381                     unsigned lookup_offset = i;
00382 
00383                     av_dlog(vc->avccontext, "Lookup offset %u ,", i);
00384 
00385                     for (k = 0; k < dim; ++k) {
00386                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;
00387                         codebook_setup->codevectors[j * dim + k] = codebook_multiplicands[multiplicand_offset] * codebook_delta_value + codebook_minimum_value + last;
00388                         if (codebook_sequence_p)
00389                             last = codebook_setup->codevectors[j * dim + k];
00390                         lookup_offset/=codebook_lookup_values;
00391                     }
00392                     tmp_vlc_bits[j] = tmp_vlc_bits[i];
00393 
00394                     av_dlog(vc->avccontext, "real lookup offset %u, vector: ", j);
00395                     for (k = 0; k < dim; ++k)
00396                         av_dlog(vc->avccontext, " %f ",
00397                                 codebook_setup->codevectors[j * dim + k]);
00398                     av_dlog(vc->avccontext, "\n");
00399 
00400                     ++j;
00401                 }
00402             }
00403             if (j != used_entries) {
00404                 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");
00405                 ret = AVERROR_INVALIDDATA;
00406                 goto error;
00407             }
00408             entries = used_entries;
00409         } else if (codebook_setup->lookup_type >= 2) {
00410             av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");
00411             ret = AVERROR_INVALIDDATA;
00412             goto error;
00413         }
00414 
00415 // Initialize VLC table
00416         if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {
00417             av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");
00418             ret = AVERROR_INVALIDDATA;
00419             goto error;
00420         }
00421         codebook_setup->maxdepth = 0;
00422         for (t = 0; t < entries; ++t)
00423             if (tmp_vlc_bits[t] >= codebook_setup->maxdepth)
00424                 codebook_setup->maxdepth = tmp_vlc_bits[t];
00425 
00426         if (codebook_setup->maxdepth > 3 * V_NB_BITS)
00427             codebook_setup->nb_bits = V_NB_BITS2;
00428         else
00429             codebook_setup->nb_bits = V_NB_BITS;
00430 
00431         codebook_setup->maxdepth = (codebook_setup->maxdepth+codebook_setup->nb_bits - 1) / codebook_setup->nb_bits;
00432 
00433         if ((ret = init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits,
00434                             entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits),
00435                             sizeof(*tmp_vlc_bits), tmp_vlc_codes,
00436                             sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),
00437                             INIT_VLC_LE))) {
00438             av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");
00439             goto error;
00440         }
00441     }
00442 
00443     av_free(tmp_vlc_bits);
00444     av_free(tmp_vlc_codes);
00445     av_free(codebook_multiplicands);
00446     return 0;
00447 
00448 // Error:
00449 error:
00450     av_free(tmp_vlc_bits);
00451     av_free(tmp_vlc_codes);
00452     av_free(codebook_multiplicands);
00453     return ret;
00454 }
00455 
00456 // Process time domain transforms part (unused in Vorbis I)
00457 
00458 static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)
00459 {
00460     GetBitContext *gb = &vc->gb;
00461     unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;
00462 
00463     for (i = 0; i < vorbis_time_count; ++i) {
00464         unsigned vorbis_tdtransform = get_bits(gb, 16);
00465 
00466         av_dlog(NULL, " Vorbis time domain transform %u: %u\n",
00467                 vorbis_time_count, vorbis_tdtransform);
00468 
00469         if (vorbis_tdtransform) {
00470             av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");
00471             return AVERROR_INVALIDDATA;
00472         }
00473     }
00474     return 0;
00475 }
00476 
00477 // Process floors part
00478 
00479 static int vorbis_floor0_decode(vorbis_context *vc,
00480                                 vorbis_floor_data *vfu, float *vec);
00481 static void create_map(vorbis_context *vc, unsigned floor_number);
00482 static int vorbis_floor1_decode(vorbis_context *vc,
00483                                 vorbis_floor_data *vfu, float *vec);
00484 static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)
00485 {
00486     GetBitContext *gb = &vc->gb;
00487     int i,j,k;
00488 
00489     vc->floor_count = get_bits(gb, 6) + 1;
00490 
00491     vc->floors = av_mallocz(vc->floor_count * sizeof(*vc->floors));
00492 
00493     for (i = 0; i < vc->floor_count; ++i) {
00494         vorbis_floor *floor_setup = &vc->floors[i];
00495 
00496         floor_setup->floor_type = get_bits(gb, 16);
00497 
00498         av_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);
00499 
00500         if (floor_setup->floor_type == 1) {
00501             int maximum_class = -1;
00502             unsigned rangebits, rangemax, floor1_values = 2;
00503 
00504             floor_setup->decode = vorbis_floor1_decode;
00505 
00506             floor_setup->data.t1.partitions = get_bits(gb, 5);
00507 
00508             av_dlog(NULL, " %d.floor: %d partitions \n",
00509                     i, floor_setup->data.t1.partitions);
00510 
00511             for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
00512                 floor_setup->data.t1.partition_class[j] = get_bits(gb, 4);
00513                 if (floor_setup->data.t1.partition_class[j] > maximum_class)
00514                     maximum_class = floor_setup->data.t1.partition_class[j];
00515 
00516                 av_dlog(NULL, " %d. floor %d partition class %d \n",
00517                         i, j, floor_setup->data.t1.partition_class[j]);
00518 
00519             }
00520 
00521             av_dlog(NULL, " maximum class %d \n", maximum_class);
00522 
00523             for (j = 0; j <= maximum_class; ++j) {
00524                 floor_setup->data.t1.class_dimensions[j] = get_bits(gb, 3) + 1;
00525                 floor_setup->data.t1.class_subclasses[j] = get_bits(gb, 2);
00526 
00527                 av_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,
00528                         floor_setup->data.t1.class_dimensions[j],
00529                         floor_setup->data.t1.class_subclasses[j]);
00530 
00531                 if (floor_setup->data.t1.class_subclasses[j]) {
00532                     GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)
00533 
00534                     av_dlog(NULL, "   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);
00535                 }
00536 
00537                 for (k = 0; k < (1 << floor_setup->data.t1.class_subclasses[j]); ++k) {
00538                     int16_t bits = get_bits(gb, 8) - 1;
00539                     if (bits != -1)
00540                         VALIDATE_INDEX(bits, vc->codebook_count)
00541                     floor_setup->data.t1.subclass_books[j][k] = bits;
00542 
00543                     av_dlog(NULL, "    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);
00544                 }
00545             }
00546 
00547             floor_setup->data.t1.multiplier = get_bits(gb, 2) + 1;
00548             floor_setup->data.t1.x_list_dim = 2;
00549 
00550             for (j = 0; j < floor_setup->data.t1.partitions; ++j)
00551                 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];
00552 
00553             floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim *
00554                                                    sizeof(*floor_setup->data.t1.list));
00555 
00556 
00557             rangebits = get_bits(gb, 4);
00558             rangemax = (1 << rangebits);
00559             if (rangemax > vc->blocksize[1] / 2) {
00560                 av_log(vc->avccontext, AV_LOG_ERROR,
00561                        "Floor value is too large for blocksize: %u (%"PRIu32")\n",
00562                        rangemax, vc->blocksize[1] / 2);
00563                 return AVERROR_INVALIDDATA;
00564             }
00565             floor_setup->data.t1.list[0].x = 0;
00566             floor_setup->data.t1.list[1].x = rangemax;
00567 
00568             for (j = 0; j < floor_setup->data.t1.partitions; ++j) {
00569                 for (k = 0; k < floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]]; ++k, ++floor1_values) {
00570                     floor_setup->data.t1.list[floor1_values].x = get_bits(gb, rangebits);
00571 
00572                     av_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,
00573                             floor_setup->data.t1.list[floor1_values].x);
00574                 }
00575             }
00576 
00577 // Precalculate order of x coordinates - needed for decode
00578             if (ff_vorbis_ready_floor1_list(vc->avccontext,
00579                                             floor_setup->data.t1.list,
00580                                             floor_setup->data.t1.x_list_dim)) {
00581                 return AVERROR_INVALIDDATA;
00582             }
00583         } else if (floor_setup->floor_type == 0) {
00584             unsigned max_codebook_dim = 0;
00585 
00586             floor_setup->decode = vorbis_floor0_decode;
00587 
00588             floor_setup->data.t0.order          = get_bits(gb,  8);
00589             floor_setup->data.t0.rate           = get_bits(gb, 16);
00590             floor_setup->data.t0.bark_map_size  = get_bits(gb, 16);
00591             if (floor_setup->data.t0.bark_map_size == 0) {
00592                 av_log(vc->avccontext, AV_LOG_ERROR,
00593                        "Floor 0 bark map size is 0.\n");
00594                 return AVERROR_INVALIDDATA;
00595             }
00596             floor_setup->data.t0.amplitude_bits = get_bits(gb,  6);
00597             /* zero would result in a div by zero later *
00598              * 2^0 - 1 == 0                             */
00599             if (floor_setup->data.t0.amplitude_bits == 0) {
00600                 av_log(vc->avccontext, AV_LOG_ERROR,
00601                        "Floor 0 amplitude bits is 0.\n");
00602                 return AVERROR_INVALIDDATA;
00603             }
00604             floor_setup->data.t0.amplitude_offset = get_bits(gb, 8);
00605             floor_setup->data.t0.num_books        = get_bits(gb, 4) + 1;
00606 
00607             /* allocate mem for booklist */
00608             floor_setup->data.t0.book_list =
00609                 av_malloc(floor_setup->data.t0.num_books);
00610             if (!floor_setup->data.t0.book_list)
00611                 return AVERROR(ENOMEM);
00612             /* read book indexes */
00613             {
00614                 int idx;
00615                 unsigned book_idx;
00616                 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
00617                     GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)
00618                     floor_setup->data.t0.book_list[idx] = book_idx;
00619                     if (vc->codebooks[book_idx].dimensions > max_codebook_dim)
00620                         max_codebook_dim = vc->codebooks[book_idx].dimensions;
00621                 }
00622             }
00623 
00624             create_map(vc, i);
00625 
00626             /* codebook dim is for padding if codebook dim doesn't *
00627              * divide order+1 then we need to read more data       */
00628             floor_setup->data.t0.lsp =
00629                 av_malloc((floor_setup->data.t0.order + 1 + max_codebook_dim)
00630                           * sizeof(*floor_setup->data.t0.lsp));
00631             if (!floor_setup->data.t0.lsp)
00632                 return AVERROR(ENOMEM);
00633 
00634             /* debug output parsed headers */
00635             av_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);
00636             av_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);
00637             av_dlog(NULL, "floor0 bark map size: %u\n",
00638                     floor_setup->data.t0.bark_map_size);
00639             av_dlog(NULL, "floor0 amplitude bits: %u\n",
00640                     floor_setup->data.t0.amplitude_bits);
00641             av_dlog(NULL, "floor0 amplitude offset: %u\n",
00642                     floor_setup->data.t0.amplitude_offset);
00643             av_dlog(NULL, "floor0 number of books: %u\n",
00644                     floor_setup->data.t0.num_books);
00645             av_dlog(NULL, "floor0 book list pointer: %p\n",
00646                     floor_setup->data.t0.book_list);
00647             {
00648                 int idx;
00649                 for (idx = 0; idx < floor_setup->data.t0.num_books; ++idx) {
00650                     av_dlog(NULL, "  Book %d: %u\n", idx + 1,
00651                             floor_setup->data.t0.book_list[idx]);
00652                 }
00653             }
00654         } else {
00655             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");
00656             return AVERROR_INVALIDDATA;
00657         }
00658     }
00659     return 0;
00660 }
00661 
00662 // Process residues part
00663 
00664 static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)
00665 {
00666     GetBitContext *gb = &vc->gb;
00667     unsigned i, j, k;
00668 
00669     vc->residue_count = get_bits(gb, 6)+1;
00670     vc->residues      = av_mallocz(vc->residue_count * sizeof(*vc->residues));
00671 
00672     av_dlog(NULL, " There are %d residues. \n", vc->residue_count);
00673 
00674     for (i = 0; i < vc->residue_count; ++i) {
00675         vorbis_residue *res_setup = &vc->residues[i];
00676         uint8_t cascade[64];
00677         unsigned high_bits, low_bits;
00678 
00679         res_setup->type = get_bits(gb, 16);
00680 
00681         av_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);
00682 
00683         res_setup->begin          = get_bits(gb, 24);
00684         res_setup->end            = get_bits(gb, 24);
00685         res_setup->partition_size = get_bits(gb, 24) + 1;
00686         /* Validations to prevent a buffer overflow later. */
00687         if (res_setup->begin>res_setup->end ||
00688             res_setup->end > (res_setup->type == 2 ? vc->avccontext->channels : 1) * vc->blocksize[1] / 2 ||
00689             (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {
00690             av_log(vc->avccontext, AV_LOG_ERROR,
00691                    "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",
00692                    res_setup->type, res_setup->begin, res_setup->end,
00693                    res_setup->partition_size, vc->blocksize[1] / 2);
00694             return AVERROR_INVALIDDATA;
00695         }
00696 
00697         res_setup->classifications = get_bits(gb, 6) + 1;
00698         GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)
00699 
00700         res_setup->ptns_to_read =
00701             (res_setup->end - res_setup->begin) / res_setup->partition_size;
00702         res_setup->classifs = av_malloc(res_setup->ptns_to_read *
00703                                         vc->audio_channels *
00704                                         sizeof(*res_setup->classifs));
00705         if (!res_setup->classifs)
00706             return AVERROR(ENOMEM);
00707 
00708         av_dlog(NULL, "    begin %d end %d part.size %d classif.s %d classbook %d \n",
00709                 res_setup->begin, res_setup->end, res_setup->partition_size,
00710                 res_setup->classifications, res_setup->classbook);
00711 
00712         for (j = 0; j < res_setup->classifications; ++j) {
00713             high_bits = 0;
00714             low_bits  = get_bits(gb, 3);
00715             if (get_bits1(gb))
00716                 high_bits = get_bits(gb, 5);
00717             cascade[j] = (high_bits << 3) + low_bits;
00718 
00719             av_dlog(NULL, "     %u class cascade depth: %d\n", j, ilog(cascade[j]));
00720         }
00721 
00722         res_setup->maxpass = 0;
00723         for (j = 0; j < res_setup->classifications; ++j) {
00724             for (k = 0; k < 8; ++k) {
00725                 if (cascade[j]&(1 << k)) {
00726                     GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)
00727 
00728                     av_dlog(NULL, "     %u class cascade depth %u book: %d\n",
00729                             j, k, res_setup->books[j][k]);
00730 
00731                     if (k>res_setup->maxpass)
00732                         res_setup->maxpass = k;
00733                 } else {
00734                     res_setup->books[j][k] = -1;
00735                 }
00736             }
00737         }
00738     }
00739     return 0;
00740 }
00741 
00742 // Process mappings part
00743 
00744 static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)
00745 {
00746     GetBitContext *gb = &vc->gb;
00747     unsigned i, j;
00748 
00749     vc->mapping_count = get_bits(gb, 6)+1;
00750     vc->mappings      = av_mallocz(vc->mapping_count * sizeof(*vc->mappings));
00751 
00752     av_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);
00753 
00754     for (i = 0; i < vc->mapping_count; ++i) {
00755         vorbis_mapping *mapping_setup = &vc->mappings[i];
00756 
00757         if (get_bits(gb, 16)) {
00758             av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");
00759             return AVERROR_INVALIDDATA;
00760         }
00761         if (get_bits1(gb)) {
00762             mapping_setup->submaps = get_bits(gb, 4) + 1;
00763         } else {
00764             mapping_setup->submaps = 1;
00765         }
00766 
00767         if (get_bits1(gb)) {
00768             mapping_setup->coupling_steps = get_bits(gb, 8) + 1;
00769             mapping_setup->magnitude      = av_mallocz(mapping_setup->coupling_steps *
00770                                                        sizeof(*mapping_setup->magnitude));
00771             mapping_setup->angle          = av_mallocz(mapping_setup->coupling_steps *
00772                                                        sizeof(*mapping_setup->angle));
00773             for (j = 0; j < mapping_setup->coupling_steps; ++j) {
00774                 GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)
00775                 GET_VALIDATED_INDEX(mapping_setup->angle[j],     ilog(vc->audio_channels - 1), vc->audio_channels)
00776             }
00777         } else {
00778             mapping_setup->coupling_steps = 0;
00779         }
00780 
00781         av_dlog(NULL, "   %u mapping coupling steps: %d\n",
00782                 i, mapping_setup->coupling_steps);
00783 
00784         if (get_bits(gb, 2)) {
00785             av_log(vc->avccontext, AV_LOG_ERROR, "%u. mapping setup data invalid.\n", i);
00786             return AVERROR_INVALIDDATA; // following spec.
00787         }
00788 
00789         if (mapping_setup->submaps>1) {
00790             mapping_setup->mux = av_mallocz(vc->audio_channels *
00791                                             sizeof(*mapping_setup->mux));
00792             for (j = 0; j < vc->audio_channels; ++j)
00793                 mapping_setup->mux[j] = get_bits(gb, 4);
00794         }
00795 
00796         for (j = 0; j < mapping_setup->submaps; ++j) {
00797             skip_bits(gb, 8); // FIXME check?
00798             GET_VALIDATED_INDEX(mapping_setup->submap_floor[j],   8, vc->floor_count)
00799             GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)
00800 
00801             av_dlog(NULL, "   %u mapping %u submap : floor %d, residue %d\n", i, j,
00802                     mapping_setup->submap_floor[j],
00803                     mapping_setup->submap_residue[j]);
00804         }
00805     }
00806     return 0;
00807 }
00808 
00809 // Process modes part
00810 
00811 static void create_map(vorbis_context *vc, unsigned floor_number)
00812 {
00813     vorbis_floor *floors = vc->floors;
00814     vorbis_floor0 *vf;
00815     int idx;
00816     int blockflag, n;
00817     int32_t *map;
00818 
00819     for (blockflag = 0; blockflag < 2; ++blockflag) {
00820         n = vc->blocksize[blockflag] / 2;
00821         floors[floor_number].data.t0.map[blockflag] =
00822             av_malloc((n + 1) * sizeof(int32_t)); // n + sentinel
00823 
00824         map =  floors[floor_number].data.t0.map[blockflag];
00825         vf  = &floors[floor_number].data.t0;
00826 
00827         for (idx = 0; idx < n; ++idx) {
00828             map[idx] = floor(BARK((vf->rate * idx) / (2.0f * n)) *
00829                              (vf->bark_map_size / BARK(vf->rate / 2.0f)));
00830             if (vf->bark_map_size-1 < map[idx])
00831                 map[idx] = vf->bark_map_size - 1;
00832         }
00833         map[n] = -1;
00834         vf->map_size[blockflag] = n;
00835     }
00836 
00837     for (idx = 0; idx <= n; ++idx) {
00838         av_dlog(NULL, "floor0 map: map at pos %d is %d\n", idx, map[idx]);
00839     }
00840 }
00841 
00842 static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)
00843 {
00844     GetBitContext *gb = &vc->gb;
00845     unsigned i;
00846 
00847     vc->mode_count = get_bits(gb, 6) + 1;
00848     vc->modes      = av_mallocz(vc->mode_count * sizeof(*vc->modes));
00849 
00850     av_dlog(NULL, " There are %d modes.\n", vc->mode_count);
00851 
00852     for (i = 0; i < vc->mode_count; ++i) {
00853         vorbis_mode *mode_setup = &vc->modes[i];
00854 
00855         mode_setup->blockflag     = get_bits1(gb);
00856         mode_setup->windowtype    = get_bits(gb, 16); //FIXME check
00857         mode_setup->transformtype = get_bits(gb, 16); //FIXME check
00858         GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);
00859 
00860         av_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",
00861                 i, mode_setup->blockflag, mode_setup->windowtype,
00862                 mode_setup->transformtype, mode_setup->mapping);
00863     }
00864     return 0;
00865 }
00866 
00867 // Process the whole setup header using the functions above
00868 
00869 static int vorbis_parse_setup_hdr(vorbis_context *vc)
00870 {
00871     GetBitContext *gb = &vc->gb;
00872     int ret;
00873 
00874     if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
00875         (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
00876         (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
00877         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");
00878         return AVERROR_INVALIDDATA;
00879     }
00880 
00881     if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {
00882         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");
00883         return ret;
00884     }
00885     if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {
00886         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");
00887         return ret;
00888     }
00889     if ((ret = vorbis_parse_setup_hdr_floors(vc))) {
00890         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");
00891         return ret;
00892     }
00893     if ((ret = vorbis_parse_setup_hdr_residues(vc))) {
00894         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");
00895         return ret;
00896     }
00897     if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {
00898         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");
00899         return ret;
00900     }
00901     if ((ret = vorbis_parse_setup_hdr_modes(vc))) {
00902         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");
00903         return ret;
00904     }
00905     if (!get_bits1(gb)) {
00906         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");
00907         return AVERROR_INVALIDDATA; // framing flag bit unset error
00908     }
00909 
00910     return 0;
00911 }
00912 
00913 // Process the identification header
00914 
00915 static int vorbis_parse_id_hdr(vorbis_context *vc)
00916 {
00917     GetBitContext *gb = &vc->gb;
00918     unsigned bl0, bl1;
00919 
00920     if ((get_bits(gb, 8) != 'v') || (get_bits(gb, 8) != 'o') ||
00921         (get_bits(gb, 8) != 'r') || (get_bits(gb, 8) != 'b') ||
00922         (get_bits(gb, 8) != 'i') || (get_bits(gb, 8) != 's')) {
00923         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");
00924         return AVERROR_INVALIDDATA;
00925     }
00926 
00927     vc->version        = get_bits_long(gb, 32);    //FIXME check 0
00928     vc->audio_channels = get_bits(gb, 8);
00929     if (vc->audio_channels <= 0) {
00930         av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");
00931         return AVERROR_INVALIDDATA;
00932     }
00933     vc->audio_samplerate = get_bits_long(gb, 32);
00934     if (vc->audio_samplerate <= 0) {
00935         av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");
00936         return AVERROR_INVALIDDATA;
00937     }
00938     vc->bitrate_maximum = get_bits_long(gb, 32);
00939     vc->bitrate_nominal = get_bits_long(gb, 32);
00940     vc->bitrate_minimum = get_bits_long(gb, 32);
00941     bl0 = get_bits(gb, 4);
00942     bl1 = get_bits(gb, 4);
00943     vc->blocksize[0] = (1 << bl0);
00944     vc->blocksize[1] = (1 << bl1);
00945     if (bl0 > 13 || bl0 < 6 || bl1 > 13 || bl1 < 6 || bl1 < bl0) {
00946         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");
00947         return AVERROR_INVALIDDATA;
00948     }
00949     vc->win[0] = ff_vorbis_vwin[bl0 - 6];
00950     vc->win[1] = ff_vorbis_vwin[bl1 - 6];
00951 
00952     if ((get_bits1(gb)) == 0) {
00953         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");
00954         return AVERROR_INVALIDDATA;
00955     }
00956 
00957     vc->channel_residues =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(*vc->channel_residues));
00958     vc->channel_floors   =  av_malloc((vc->blocksize[1]  / 2) * vc->audio_channels * sizeof(*vc->channel_floors));
00959     vc->saved            =  av_mallocz((vc->blocksize[1] / 4) * vc->audio_channels * sizeof(*vc->saved));
00960     vc->previous_window  = 0;
00961 
00962     ff_mdct_init(&vc->mdct[0], bl0, 1, -vc->scale_bias);
00963     ff_mdct_init(&vc->mdct[1], bl1, 1, -vc->scale_bias);
00964 
00965     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 ",
00966             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);
00967 
00968 /*
00969     BLK = vc->blocksize[0];
00970     for (i = 0; i < BLK / 2; ++i) {
00971         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)));
00972     }
00973 */
00974 
00975     return 0;
00976 }
00977 
00978 // Process the extradata using the functions above (identification header, setup header)
00979 
00980 static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
00981 {
00982     vorbis_context *vc = avccontext->priv_data;
00983     uint8_t *headers   = avccontext->extradata;
00984     int headers_len    = avccontext->extradata_size;
00985     uint8_t *header_start[3];
00986     int header_len[3];
00987     GetBitContext *gb = &vc->gb;
00988     int hdr_type, ret;
00989 
00990     vc->avccontext = avccontext;
00991     dsputil_init(&vc->dsp, avccontext);
00992     ff_fmt_convert_init(&vc->fmt_conv, avccontext);
00993 
00994     if (avccontext->request_sample_fmt == AV_SAMPLE_FMT_FLT) {
00995         avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;
00996         vc->scale_bias = 1.0f;
00997     } else {
00998         avccontext->sample_fmt = AV_SAMPLE_FMT_S16;
00999         vc->scale_bias = 32768.0f;
01000     }
01001 
01002     if (!headers_len) {
01003         av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");
01004         return AVERROR_INVALIDDATA;
01005     }
01006 
01007     if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {
01008         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
01009         return ret;
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 AVERROR_INVALIDDATA;
01017     }
01018     if ((ret = vorbis_parse_id_hdr(vc))) {
01019         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");
01020         vorbis_free(vc);
01021         return ret;
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 AVERROR_INVALIDDATA;
01030     }
01031     if ((ret = vorbis_parse_setup_hdr(vc))) {
01032         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");
01033         vorbis_free(vc);
01034         return ret;
01035     }
01036 
01037     if (vc->audio_channels > 8)
01038         avccontext->channel_layout = 0;
01039     else
01040         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
01041 
01042     avccontext->channels    = vc->audio_channels;
01043     avccontext->sample_rate = vc->audio_samplerate;
01044     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;
01045 
01046     avcodec_get_frame_defaults(&vc->frame);
01047     avccontext->coded_frame = &vc->frame;
01048 
01049     return 0;
01050 }
01051 
01052 // Decode audiopackets -------------------------------------------------
01053 
01054 // Read and decode floor
01055 
01056 static int vorbis_floor0_decode(vorbis_context *vc,
01057                                 vorbis_floor_data *vfu, float *vec)
01058 {
01059     vorbis_floor0 *vf = &vfu->t0;
01060     float *lsp = vf->lsp;
01061     unsigned amplitude, book_idx;
01062     unsigned blockflag = vc->modes[vc->mode_number].blockflag;
01063 
01064     amplitude = get_bits(&vc->gb, vf->amplitude_bits);
01065     if (amplitude > 0) {
01066         float last = 0;
01067         unsigned idx, lsp_len = 0;
01068         vorbis_codebook codebook;
01069 
01070         book_idx = get_bits(&vc->gb, ilog(vf->num_books));
01071         if (book_idx >= vf->num_books) {
01072             av_log(vc->avccontext, AV_LOG_ERROR,
01073                     "floor0 dec: booknumber too high!\n");
01074             book_idx =  0;
01075         }
01076         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);
01077         codebook = vc->codebooks[vf->book_list[book_idx]];
01078         /* Invalid codebook! */
01079         if (!codebook.codevectors)
01080             return AVERROR_INVALIDDATA;
01081 
01082         while (lsp_len<vf->order) {
01083             int vec_off;
01084 
01085             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);
01086             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);
01087             /* read temp vector */
01088             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,
01089                                codebook.nb_bits, codebook.maxdepth)
01090                       * codebook.dimensions;
01091             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);
01092             /* copy each vector component and add last to it */
01093             for (idx = 0; idx < codebook.dimensions; ++idx)
01094                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;
01095             last = lsp[lsp_len+idx-1]; /* set last to last vector component */
01096 
01097             lsp_len += codebook.dimensions;
01098         }
01099         /* DEBUG: output lsp coeffs */
01100         {
01101             int idx;
01102             for (idx = 0; idx < lsp_len; ++idx)
01103                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);
01104         }
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++)
01113                 lsp[i] = 2.0f * cos(lsp[i]);
01114 
01115             av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",
01116                     vf->map_size[blockflag], order, wstep);
01117 
01118             i = 0;
01119             while (i < vf->map_size[blockflag]) {
01120                 int j, iter_cond = vf->map[blockflag][i];
01121                 float p = 0.5f;
01122                 float q = 0.5f;
01123                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times
01124 
01125                 /* similar part for the q and p products */
01126                 for (j = 0; j + 1 < order; j += 2) {
01127                     q *= lsp[j]     - two_cos_w;
01128                     p *= lsp[j + 1] - two_cos_w;
01129                 }
01130                 if (j == order) { // even order
01131                     p *= p * (2.0f - two_cos_w);
01132                     q *= q * (2.0f + two_cos_w);
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                 q = exp((((amplitude*vf->amplitude_offset) /
01143                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))
01144                          - vf->amplitude_offset) * .11512925f);
01145 
01146                 /* fill vector */
01147                 do {
01148                     vec[i] = q; ++i;
01149                 } while (vf->map[blockflag][i] == iter_cond);
01150             }
01151         }
01152     } else {
01153         /* this channel is unused */
01154         return 1;
01155     }
01156 
01157     av_dlog(NULL, " Floor0 decoded\n");
01158 
01159     return 0;
01160 }
01161 
01162 static int vorbis_floor1_decode(vorbis_context *vc,
01163                                 vorbis_floor_data *vfu, float *vec)
01164 {
01165     vorbis_floor1 *vf = &vfu->t1;
01166     GetBitContext *gb = &vc->gb;
01167     uint16_t range_v[4] = { 256, 128, 86, 64 };
01168     unsigned range = range_v[vf->multiplier - 1];
01169     uint16_t floor1_Y[258];
01170     uint16_t floor1_Y_final[258];
01171     int floor1_flag[258];
01172     unsigned class, cdim, cbits, csub, cval, offset, i, j;
01173     int book, adx, ady, dy, off, predicted, err;
01174 
01175 
01176     if (!get_bits1(gb)) // silence
01177         return 1;
01178 
01179 // Read values (or differences) for the floor's points
01180 
01181     floor1_Y[0] = get_bits(gb, ilog(range - 1));
01182     floor1_Y[1] = get_bits(gb, ilog(range - 1));
01183 
01184     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);
01185 
01186     offset = 2;
01187     for (i = 0; i < vf->partitions; ++i) {
01188         class = vf->partition_class[i];
01189         cdim   = vf->class_dimensions[class];
01190         cbits  = vf->class_subclasses[class];
01191         csub = (1 << cbits) - 1;
01192         cval = 0;
01193 
01194         av_dlog(NULL, "Cbits %u\n", cbits);
01195 
01196         if (cbits) // this reads all subclasses for this partition's class
01197             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,
01198                             vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);
01199 
01200         for (j = 0; j < cdim; ++j) {
01201             book = vf->subclass_books[class][cval & csub];
01202 
01203             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",
01204                     book, cbits, cval, get_bits_count(gb));
01205 
01206             cval = cval >> cbits;
01207             if (book > -1) {
01208                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,
01209                 vc->codebooks[book].nb_bits, 3);
01210             } else {
01211                 floor1_Y[offset+j] = 0;
01212             }
01213 
01214             av_dlog(NULL, " floor(%d) = %d \n",
01215                     vf->list[offset+j].x, floor1_Y[offset+j]);
01216         }
01217         offset+=cdim;
01218     }
01219 
01220 // Amplitude calculation from the differences
01221 
01222     floor1_flag[0] = 1;
01223     floor1_flag[1] = 1;
01224     floor1_Y_final[0] = floor1_Y[0];
01225     floor1_Y_final[1] = floor1_Y[1];
01226 
01227     for (i = 2; i < vf->x_list_dim; ++i) {
01228         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;
01229 
01230         low_neigh_offs  = vf->list[i].low;
01231         high_neigh_offs = vf->list[i].high;
01232         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin
01233         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;
01234         ady = FFABS(dy);
01235         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);
01236         off = err / adx;
01237         if (dy < 0) {
01238             predicted = floor1_Y_final[low_neigh_offs] - off;
01239         } else {
01240             predicted = floor1_Y_final[low_neigh_offs] + off;
01241         } // render_point end
01242 
01243         val = floor1_Y[i];
01244         highroom = range-predicted;
01245         lowroom  = predicted;
01246         if (highroom < lowroom) {
01247             room = highroom * 2;
01248         } else {
01249             room = lowroom * 2;   // SPEC mispelling
01250         }
01251         if (val) {
01252             floor1_flag[low_neigh_offs]  = 1;
01253             floor1_flag[high_neigh_offs] = 1;
01254             floor1_flag[i]               = 1;
01255             if (val >= room) {
01256                 if (highroom > lowroom) {
01257                     floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);
01258                 } else {
01259                     floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);
01260                 }
01261             } else {
01262                 if (val & 1) {
01263                     floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);
01264                 } else {
01265                     floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);
01266                 }
01267             }
01268         } else {
01269             floor1_flag[i]    = 0;
01270             floor1_Y_final[i] = av_clip_uint16(predicted);
01271         }
01272 
01273         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",
01274                 vf->list[i].x, floor1_Y_final[i], val);
01275     }
01276 
01277 // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?
01278 
01279     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);
01280 
01281     av_dlog(NULL, " Floor decoded\n");
01282 
01283     return 0;
01284 }
01285 
01286 // Read and decode residue
01287 
01288 static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,
01289                                                            vorbis_residue *vr,
01290                                                            unsigned ch,
01291                                                            uint8_t *do_not_decode,
01292                                                            float *vec,
01293                                                            unsigned vlen,
01294                                                            unsigned ch_left,
01295                                                            int vr_type)
01296 {
01297     GetBitContext *gb = &vc->gb;
01298     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;
01299     unsigned ptns_to_read = vr->ptns_to_read;
01300     uint8_t *classifs = vr->classifs;
01301     unsigned pass, ch_used, i, j, k, l;
01302     unsigned max_output = (ch - 1) * vlen;
01303 
01304     if (vr_type == 2) {
01305         for (j = 1; j < ch; ++j)
01306             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input
01307         if (do_not_decode[0])
01308             return 0;
01309         ch_used = 1;
01310         max_output += vr->end / ch;
01311     } else {
01312         ch_used = ch;
01313         max_output += vr->end;
01314     }
01315 
01316     if (max_output > ch_left * vlen) {
01317         av_log(vc->avccontext, AV_LOG_ERROR, "Insufficient output buffer\n");
01318         return -1;
01319     }
01320 
01321     av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);
01322 
01323     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?
01324         uint16_t voffset, partition_count, j_times_ptns_to_read;
01325 
01326         voffset = vr->begin;
01327         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error
01328             if (!pass) {
01329                 unsigned inverse_class = ff_inverse[vr->classifications];
01330                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
01331                     if (!do_not_decode[j]) {
01332                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,
01333                                                  vc->codebooks[vr->classbook].nb_bits, 3);
01334 
01335                         av_dlog(NULL, "Classword: %u\n", temp);
01336 
01337                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]
01338                         for (i = 0; i < c_p_c; ++i) {
01339                             unsigned temp2;
01340 
01341                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;
01342                             if (partition_count + c_p_c - 1 - i < ptns_to_read)
01343                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;
01344                             temp = temp2;
01345                         }
01346                     }
01347                     j_times_ptns_to_read += ptns_to_read;
01348                 }
01349             }
01350             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {
01351                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {
01352                     unsigned voffs;
01353 
01354                     if (!do_not_decode[j]) {
01355                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];
01356                         int vqbook  = vr->books[vqclass][pass];
01357 
01358                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {
01359                             unsigned coffs;
01360                             unsigned dim  = vc->codebooks[vqbook].dimensions;
01361                             unsigned step = dim == 1 ? vr->partition_size
01362                                                      : FASTDIV(vr->partition_size, dim);
01363                             vorbis_codebook codebook = vc->codebooks[vqbook];
01364 
01365                             if (vr_type == 0) {
01366 
01367                                 voffs = voffset+j*vlen;
01368                                 for (k = 0; k < step; ++k) {
01369                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
01370                                     for (l = 0; l < dim; ++l)
01371                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH
01372                                 }
01373                             } else if (vr_type == 1) {
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, ++voffs) {
01378                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH
01379 
01380                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d  \n",
01381                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);
01382                                     }
01383                                 }
01384                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized
01385                                 voffs = voffset >> 1;
01386 
01387                                 if (dim == 2) {
01388                                     for (k = 0; k < step; ++k) {
01389                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;
01390                                         vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH
01391                                         vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH
01392                                     }
01393                                 } else if (dim == 4) {
01394                                     for (k = 0; k < step; ++k, voffs += 2) {
01395                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;
01396                                         vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH
01397                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH
01398                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH
01399                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH
01400                                     }
01401                                 } else
01402                                 for (k = 0; k < step; ++k) {
01403                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
01404                                     for (l = 0; l < dim; l += 2, voffs++) {
01405                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH
01406                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH
01407 
01408                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",
01409                                                 pass, voffset / ch + (voffs % ch) * vlen,
01410                                                 vec[voffset / ch + (voffs % ch) * vlen],
01411                                                 codebook.codevectors[coffs + l], coffs, l);
01412                                     }
01413                                 }
01414 
01415                             } else if (vr_type == 2) {
01416                                 voffs = voffset;
01417 
01418                                 for (k = 0; k < step; ++k) {
01419                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;
01420                                     for (l = 0; l < dim; ++l, ++voffs) {
01421                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %
01422 
01423                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",
01424                                                 pass, voffset / ch + (voffs % ch) * vlen,
01425                                                 vec[voffset / ch + (voffs % ch) * vlen],
01426                                                 codebook.codevectors[coffs + l], coffs, l);
01427                                     }
01428                                 }
01429                             }
01430                         }
01431                     }
01432                     j_times_ptns_to_read += ptns_to_read;
01433                 }
01434                 ++partition_count;
01435                 voffset += vr->partition_size;
01436             }
01437         }
01438     }
01439     return 0;
01440 }
01441 
01442 static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
01443                                         unsigned ch,
01444                                         uint8_t *do_not_decode,
01445                                         float *vec, unsigned vlen,
01446                                         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 AVERROR_INVALIDDATA;
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         if (mag[i] > 0.0) {
01465             if (ang[i] > 0.0) {
01466                 ang[i] = mag[i] - ang[i];
01467             } else {
01468                 float temp = ang[i];
01469                 ang[i]     = mag[i];
01470                 mag[i]    += temp;
01471             }
01472         } else {
01473             if (ang[i] > 0.0) {
01474                 ang[i] += mag[i];
01475             } else {
01476                 float temp = ang[i];
01477                 ang[i]     = mag[i];
01478                 mag[i]    -= temp;
01479             }
01480         }
01481     }
01482 }
01483 
01484 // Decode the audio packet using the functions above
01485 
01486 static int vorbis_parse_audio_packet(vorbis_context *vc)
01487 {
01488     GetBitContext *gb = &vc->gb;
01489     FFTContext *mdct;
01490     unsigned previous_window = vc->previous_window;
01491     unsigned mode_number, blockflag, blocksize;
01492     int i, j;
01493     uint8_t no_residue[255];
01494     uint8_t do_not_decode[255];
01495     vorbis_mapping *mapping;
01496     float *ch_res_ptr   = vc->channel_residues;
01497     float *ch_floor_ptr = vc->channel_floors;
01498     uint8_t res_chan[255];
01499     unsigned res_num = 0;
01500     int retlen  = 0;
01501     unsigned ch_left = vc->audio_channels;
01502     unsigned vlen;
01503 
01504     if (get_bits1(gb)) {
01505         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");
01506         return AVERROR_INVALIDDATA; // packet type not audio
01507     }
01508 
01509     if (vc->mode_count == 1) {
01510         mode_number = 0;
01511     } else {
01512         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)
01513     }
01514     vc->mode_number = mode_number;
01515     mapping = &vc->mappings[vc->modes[mode_number].mapping];
01516 
01517     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,
01518             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);
01519 
01520     blockflag = vc->modes[mode_number].blockflag;
01521     blocksize = vc->blocksize[blockflag];
01522     vlen = blocksize / 2;
01523     if (blockflag)
01524         skip_bits(gb, 2); // previous_window, next_window
01525 
01526     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
01527     memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?
01528 
01529 // Decode floor
01530 
01531     for (i = 0; i < vc->audio_channels; ++i) {
01532         vorbis_floor *floor;
01533         int ret;
01534         if (mapping->submaps > 1) {
01535             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];
01536         } else {
01537             floor = &vc->floors[mapping->submap_floor[0]];
01538         }
01539 
01540         ret = floor->decode(vc, &floor->data, ch_floor_ptr);
01541 
01542         if (ret < 0) {
01543             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");
01544             return AVERROR_INVALIDDATA;
01545         }
01546         no_residue[i] = ret;
01547         ch_floor_ptr += vlen;
01548     }
01549 
01550 // Nonzero vector propagate
01551 
01552     for (i = mapping->coupling_steps - 1; i >= 0; --i) {
01553         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {
01554             no_residue[mapping->magnitude[i]] = 0;
01555             no_residue[mapping->angle[i]]     = 0;
01556         }
01557     }
01558 
01559 // Decode residue
01560 
01561     for (i = 0; i < mapping->submaps; ++i) {
01562         vorbis_residue *residue;
01563         unsigned ch = 0;
01564         int ret;
01565 
01566         for (j = 0; j < vc->audio_channels; ++j) {
01567             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {
01568                 res_chan[j] = res_num;
01569                 if (no_residue[j]) {
01570                     do_not_decode[ch] = 1;
01571                 } else {
01572                     do_not_decode[ch] = 0;
01573                 }
01574                 ++ch;
01575                 ++res_num;
01576             }
01577         }
01578         residue = &vc->residues[mapping->submap_residue[i]];
01579         if (ch_left < ch) {
01580             av_log(vc->avccontext, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");
01581             return -1;
01582         }
01583         if (ch) {
01584             ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);
01585             if (ret < 0)
01586                 return ret;
01587         }
01588 
01589         ch_res_ptr += ch * vlen;
01590         ch_left -= ch;
01591     }
01592 
01593 // Inverse coupling
01594 
01595     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed
01596         float *mag, *ang;
01597 
01598         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;
01599         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;
01600         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);
01601     }
01602 
01603 // Dotproduct, MDCT
01604 
01605     mdct = &vc->mdct[blockflag];
01606 
01607     for (j = vc->audio_channels-1;j >= 0; j--) {
01608         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;
01609         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;
01610         vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);
01611         mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);
01612     }
01613 
01614 // Overlap/add, save data for next overlapping  FPMATH
01615 
01616     retlen = (blocksize + vc->blocksize[previous_window]) / 4;
01617     for (j = 0; j < vc->audio_channels; j++) {
01618         unsigned bs0 = vc->blocksize[0];
01619         unsigned bs1 = vc->blocksize[1];
01620         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;
01621         float *saved      = vc->saved + j * bs1 / 4;
01622         float *ret        = vc->channel_floors + j * retlen;
01623         float *buf        = residue;
01624         const float *win  = vc->win[blockflag & previous_window];
01625 
01626         if (blockflag == previous_window) {
01627             vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);
01628         } else if (blockflag > previous_window) {
01629             vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);
01630             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));
01631         } else {
01632             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));
01633             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);
01634         }
01635         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));
01636     }
01637 
01638     vc->previous_window = blockflag;
01639     return retlen;
01640 }
01641 
01642 // Return the decoded audio packet through the standard api
01643 
01644 static int vorbis_decode_frame(AVCodecContext *avccontext, void *data,
01645                                int *got_frame_ptr, AVPacket *avpkt)
01646 {
01647     const uint8_t *buf = avpkt->data;
01648     int buf_size       = avpkt->size;
01649     vorbis_context *vc = avccontext->priv_data;
01650     GetBitContext *gb = &vc->gb;
01651     const float *channel_ptrs[255];
01652     int i, len, ret;
01653 
01654     av_dlog(NULL, "packet length %d \n", buf_size);
01655 
01656     init_get_bits(gb, buf, buf_size*8);
01657 
01658     if ((len = vorbis_parse_audio_packet(vc)) <= 0)
01659         return len;
01660 
01661     if (!vc->first_frame) {
01662         vc->first_frame = 1;
01663         *got_frame_ptr = 0;
01664         return buf_size;
01665     }
01666 
01667     av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",
01668             get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);
01669 
01670     /* get output buffer */
01671     vc->frame.nb_samples = len;
01672     if ((ret = ff_get_buffer(avccontext, &vc->frame)) < 0) {
01673         av_log(avccontext, AV_LOG_ERROR, "get_buffer() failed\n");
01674         return ret;
01675     }
01676 
01677     if (vc->audio_channels > 8) {
01678         for (i = 0; i < vc->audio_channels; i++)
01679             channel_ptrs[i] = vc->channel_floors + i * len;
01680     } else {
01681         for (i = 0; i < vc->audio_channels; i++)
01682             channel_ptrs[i] = vc->channel_floors +
01683                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];
01684     }
01685 
01686     if (avccontext->sample_fmt == AV_SAMPLE_FMT_FLT)
01687         vc->fmt_conv.float_interleave((float *)vc->frame.data[0], channel_ptrs,
01688                                       len, vc->audio_channels);
01689     else
01690         vc->fmt_conv.float_to_int16_interleave((int16_t *)vc->frame.data[0],
01691                                                channel_ptrs, len,
01692                                                vc->audio_channels);
01693 
01694     *got_frame_ptr   = 1;
01695     *(AVFrame *)data = vc->frame;
01696 
01697     return buf_size;
01698 }
01699 
01700 // Close decoder
01701 
01702 static av_cold int vorbis_decode_close(AVCodecContext *avccontext)
01703 {
01704     vorbis_context *vc = avccontext->priv_data;
01705 
01706     vorbis_free(vc);
01707 
01708     return 0;
01709 }
01710 
01711 AVCodec ff_vorbis_decoder = {
01712     .name           = "vorbis",
01713     .type           = AVMEDIA_TYPE_AUDIO,
01714     .id             = CODEC_ID_VORBIS,
01715     .priv_data_size = sizeof(vorbis_context),
01716     .init           = vorbis_decode_init,
01717     .close          = vorbis_decode_close,
01718     .decode         = vorbis_decode_frame,
01719     .capabilities   = CODEC_CAP_DR1,
01720     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
01721     .channel_layouts = ff_vorbis_channel_layouts,
01722     .sample_fmts = (const enum AVSampleFormat[]) {
01723         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE
01724     },
01725 };
01726