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FFmpeg/libavcodec/vorbis_dec.c

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  1. /**

  2.  * @file libavcodec/vorbis_dec.c

  3.  * Vorbis I decoder

  4.  * @author Denes Balatoni  ( dbalatoni programozo hu )

  5. 

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. #undef V_DEBUG

  24. //#define V_DEBUG

  25. //#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)

  26. 

  27. #include <math.h>

  28. 

  29. #define ALT_BITSTREAM_READER_LE

  30. #include "avcodec.h"

  31. #include "bitstream.h"

  32. #include "dsputil.h"

  33. 

  34. #include "vorbis.h"

  35. #include "xiph.h"

  36. 

  37. #define V_NB_BITS 8

  38. #define V_NB_BITS2 11

  39. #define V_MAX_VLCS (1<<16)

  40. 

  41. #ifndef V_DEBUG

  42. #define AV_DEBUG(...)

  43. #endif

  44. 

  45. #undef NDEBUG

  46. #include <assert.h>

  47. 

  48. typedef struct {

  49.     uint_fast8_t dimensions;

  50.     uint_fast8_t lookup_type;

  51.     uint_fast8_t maxdepth;

  52.     VLC vlc;

  53.     float *codevectors;

  54.     unsigned int nb_bits;

  55. } vorbis_codebook;

  56. 

  57. typedef union vorbis_floor_u vorbis_floor_data;

  58. typedef struct vorbis_floor0_s vorbis_floor0;

  59. typedef struct vorbis_floor1_s vorbis_floor1;

  60. struct vorbis_context_s;

  61. typedef

  62. uint_fast8_t (* vorbis_floor_decode_func)

  63.              (struct vorbis_context_s *, vorbis_floor_data *, float *);

  64. typedef struct {

  65.     uint_fast8_t floor_type;

  66.     vorbis_floor_decode_func decode;

  67.     union vorbis_floor_u

  68.     {

  69.         struct vorbis_floor0_s

  70.         {

  71.             uint_fast8_t order;

  72.             uint_fast16_t rate;

  73.             uint_fast16_t bark_map_size;

  74.             int_fast32_t * map[2];

  75.             uint_fast32_t map_size[2];

  76.             uint_fast8_t amplitude_bits;

  77.             uint_fast8_t amplitude_offset;

  78.             uint_fast8_t num_books;

  79.             uint_fast8_t * book_list;

  80.             float * lsp;

  81.         } t0;

  82.         struct vorbis_floor1_s

  83.         {

  84.             uint_fast8_t partitions;

  85.             uint_fast8_t maximum_class;

  86.             uint_fast8_t partition_class[32];

  87.             uint_fast8_t class_dimensions[16];

  88.             uint_fast8_t class_subclasses[16];

  89.             uint_fast8_t class_masterbook[16];

  90.             int_fast16_t subclass_books[16][8];

  91.             uint_fast8_t multiplier;

  92.             uint_fast16_t x_list_dim;

  93.             vorbis_floor1_entry * list;

  94.         } t1;

  95.     } data;

  96. } vorbis_floor;

  97. 

  98. typedef struct {

  99.     uint_fast16_t type;

  100.     uint_fast32_t begin;

  101.     uint_fast32_t end;

  102.     uint_fast32_t partition_size;

  103.     uint_fast8_t classifications;

  104.     uint_fast8_t classbook;

  105.     int_fast16_t books[64][8];

  106.     uint_fast8_t maxpass;

  107. } vorbis_residue;

  108. 

  109. typedef struct {

  110.     uint_fast8_t submaps;

  111.     uint_fast16_t coupling_steps;

  112.     uint_fast8_t *magnitude;

  113.     uint_fast8_t *angle;

  114.     uint_fast8_t *mux;

  115.     uint_fast8_t submap_floor[16];

  116.     uint_fast8_t submap_residue[16];

  117. } vorbis_mapping;

  118. 

  119. typedef struct {

  120.     uint_fast8_t blockflag;

  121.     uint_fast16_t windowtype;

  122.     uint_fast16_t transformtype;

  123.     uint_fast8_t mapping;

  124. } vorbis_mode;

  125. 

  126. typedef struct vorbis_context_s {

  127.     AVCodecContext *avccontext;

  128.     GetBitContext gb;

  129.     DSPContext dsp;

  130. 

  131.     MDCTContext mdct[2];

  132.     uint_fast8_t first_frame;

  133.     uint_fast32_t version;

  134.     uint_fast8_t audio_channels;

  135.     uint_fast32_t audio_samplerate;

  136.     uint_fast32_t bitrate_maximum;

  137.     uint_fast32_t bitrate_nominal;

  138.     uint_fast32_t bitrate_minimum;

  139.     uint_fast32_t blocksize[2];

  140.     const float * win[2];

  141.     uint_fast16_t codebook_count;

  142.     vorbis_codebook *codebooks;

  143.     uint_fast8_t floor_count;

  144.     vorbis_floor *floors;

  145.     uint_fast8_t residue_count;

  146.     vorbis_residue *residues;

  147.     uint_fast8_t mapping_count;

  148.     vorbis_mapping *mappings;

  149.     uint_fast8_t mode_count;

  150.     vorbis_mode *modes;

  151.     uint_fast8_t mode_number; // mode number for the current packet

  152.     uint_fast8_t previous_window;

  153.     float *channel_residues;

  154.     float *channel_floors;

  155.     float *saved;

  156.     uint_fast32_t add_bias; // for float->int conversion

  157.     uint_fast32_t exp_bias;

  158. } vorbis_context;

  159. 

  160. /* Helper functions */

  161. 

  162. #define BARK(x) \

  163.     (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))

  164. 

  165. static float vorbisfloat2float(uint_fast32_t val) {

  166.     double mant=val&0x1fffff;

  167.     long exp=(val&0x7fe00000L)>>21;

  168.     if (val&0x80000000) mant=-mant;

  169.     return ldexp(mant, exp - 20 - 768);

  170. }

  171. 

  172. 

  173. // Free all allocated memory -----------------------------------------

  174. 

  175. static void vorbis_free(vorbis_context *vc) {

  176.     int_fast16_t i;

  177. 

  178.     av_freep(&vc->channel_residues);

  179.     av_freep(&vc->channel_floors);

  180.     av_freep(&vc->saved);

  181. 

  182.     av_freep(&vc->residues);

  183.     av_freep(&vc->modes);

  184. 

  185.     ff_mdct_end(&vc->mdct[0]);

  186.     ff_mdct_end(&vc->mdct[1]);

  187. 

  188.     for(i=0;i<vc->codebook_count;++i) {

  189.         av_free(vc->codebooks[i].codevectors);

  190.         free_vlc(&vc->codebooks[i].vlc);

  191.     }

  192.     av_freep(&vc->codebooks);

  193. 

  194.     for(i=0;i<vc->floor_count;++i) {

  195.         if(vc->floors[i].floor_type==0) {

  196.             av_free(vc->floors[i].data.t0.map[0]);

  197.             av_free(vc->floors[i].data.t0.map[1]);

  198.             av_free(vc->floors[i].data.t0.book_list);

  199.             av_free(vc->floors[i].data.t0.lsp);

  200.         }

  201.         else {

  202.             av_free(vc->floors[i].data.t1.list);

  203.         }

  204.     }

  205.     av_freep(&vc->floors);

  206. 

  207.     for(i=0;i<vc->mapping_count;++i) {

  208.         av_free(vc->mappings[i].magnitude);

  209.         av_free(vc->mappings[i].angle);

  210.         av_free(vc->mappings[i].mux);

  211.     }

  212.     av_freep(&vc->mappings);

  213. 

  214.     if(vc->exp_bias){

  215.         av_freep(&vc->win[0]);

  216.         av_freep(&vc->win[1]);

  217.     }

  218. }

  219. 

  220. // Parse setup header -------------------------------------------------

  221. 

  222. // Process codebooks part

  223. 

  224. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {

  225.     uint_fast16_t cb;

  226.     uint8_t *tmp_vlc_bits;

  227.     uint32_t *tmp_vlc_codes;

  228.     GetBitContext *gb=&vc->gb;

  229. 

  230.     vc->codebook_count=get_bits(gb,8)+1;

  231. 

  232.     AV_DEBUG(" Codebooks: %d \n", vc->codebook_count);

  233. 

  234.     vc->codebooks=av_mallocz(vc->codebook_count * sizeof(vorbis_codebook));

  235.     tmp_vlc_bits =av_mallocz(V_MAX_VLCS * sizeof(uint8_t));

  236.     tmp_vlc_codes=av_mallocz(V_MAX_VLCS * sizeof(uint32_t));

  237. 

  238.     for(cb=0;cb<vc->codebook_count;++cb) {

  239.         vorbis_codebook *codebook_setup=&vc->codebooks[cb];

  240.         uint_fast8_t ordered;

  241.         uint_fast32_t t, used_entries=0;

  242.         uint_fast32_t entries;

  243. 

  244.         AV_DEBUG(" %d. Codebook \n", cb);

  245. 

  246.         if (get_bits(gb, 24)!=0x564342) {

  247.             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook setup data corrupt. \n", cb);

  248.             goto error;

  249.         }

  250. 

  251.         codebook_setup->dimensions=get_bits(gb, 16);

  252.         if (codebook_setup->dimensions>16||codebook_setup->dimensions==0) {

  253.             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook's dimension is invalid (%d). \n", cb, codebook_setup->dimensions);

  254.             goto error;

  255.         }

  256.         entries=get_bits(gb, 24);

  257.         if (entries>V_MAX_VLCS) {

  258.             av_log(vc->avccontext, AV_LOG_ERROR, " %"PRIdFAST16". Codebook has too many entries (%"PRIdFAST32"). \n", cb, entries);

  259.             goto error;

  260.         }

  261. 

  262.         ordered=get_bits1(gb);

  263. 

  264.         AV_DEBUG(" codebook_dimensions %d, codebook_entries %d \n", codebook_setup->dimensions, entries);

  265. 

  266.         if (!ordered) {

  267.             uint_fast16_t ce;

  268.             uint_fast8_t flag;

  269.             uint_fast8_t sparse=get_bits1(gb);

  270. 

  271.             AV_DEBUG(" not ordered \n");

  272. 

  273.             if (sparse) {

  274.                 AV_DEBUG(" sparse \n");

  275. 

  276.                 used_entries=0;

  277.                 for(ce=0;ce<entries;++ce) {

  278.                     flag=get_bits1(gb);

  279.                     if (flag) {

  280.                         tmp_vlc_bits[ce]=get_bits(gb, 5)+1;

  281.                         ++used_entries;

  282.                     }

  283.                     else tmp_vlc_bits[ce]=0;

  284.                 }

  285.             } else {

  286.                 AV_DEBUG(" not sparse \n");

  287. 

  288.                 used_entries=entries;

  289.                 for(ce=0;ce<entries;++ce) {

  290.                     tmp_vlc_bits[ce]=get_bits(gb, 5)+1;

  291.                 }

  292.             }

  293.         } else {

  294.             uint_fast16_t current_entry=0;

  295.             uint_fast8_t current_length=get_bits(gb, 5)+1;

  296. 

  297.             AV_DEBUG(" ordered, current length: %d \n", current_length);  //FIXME

  298. 

  299.             used_entries=entries;

  300.             for(;current_entry<used_entries;++current_length) {

  301.                 uint_fast16_t i, number;

  302. 

  303.                 AV_DEBUG(" number bits: %d ", ilog(entries - current_entry));

  304. 

  305.                 number=get_bits(gb, ilog(entries - current_entry));

  306. 

  307.                 AV_DEBUG(" number: %d \n", number);

  308. 

  309.                 for(i=current_entry;i<number+current_entry;++i) {

  310.                     if (i<used_entries) tmp_vlc_bits[i]=current_length;

  311.                 }

  312. 

  313.                 current_entry+=number;

  314.             }

  315.             if (current_entry>used_entries) {

  316.                 av_log(vc->avccontext, AV_LOG_ERROR, " More codelengths than codes in codebook. \n");

  317.                 goto error;

  318.             }

  319.         }

  320. 

  321.         codebook_setup->lookup_type=get_bits(gb, 4);

  322. 

  323.         AV_DEBUG(" lookup type: %d : %s \n", codebook_setup->lookup_type, codebook_setup->lookup_type ? "vq" : "no lookup" );

  324. 

  325. // If the codebook is used for (inverse) VQ, calculate codevectors.

  326. 

  327.         if (codebook_setup->lookup_type==1) {

  328.             uint_fast16_t i, j, k;

  329.             uint_fast16_t codebook_lookup_values=ff_vorbis_nth_root(entries, codebook_setup->dimensions);

  330.             uint_fast16_t codebook_multiplicands[codebook_lookup_values];

  331. 

  332.             float codebook_minimum_value=vorbisfloat2float(get_bits_long(gb, 32));

  333.             float codebook_delta_value=vorbisfloat2float(get_bits_long(gb, 32));

  334.             uint_fast8_t codebook_value_bits=get_bits(gb, 4)+1;

  335.             uint_fast8_t codebook_sequence_p=get_bits1(gb);

  336. 

  337.             AV_DEBUG(" We expect %d numbers for building the codevectors. \n", codebook_lookup_values);

  338.             AV_DEBUG("  delta %f minmum %f \n", codebook_delta_value, codebook_minimum_value);

  339. 

  340.             for(i=0;i<codebook_lookup_values;++i) {

  341.                 codebook_multiplicands[i]=get_bits(gb, codebook_value_bits);

  342. 

  343.                 AV_DEBUG(" multiplicands*delta+minmum : %e \n", (float)codebook_multiplicands[i]*codebook_delta_value+codebook_minimum_value);

  344.                 AV_DEBUG(" multiplicand %d \n", codebook_multiplicands[i]);

  345.             }

  346. 

  347. // Weed out unused vlcs and build codevector vector

  348.             codebook_setup->codevectors=used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;

  349.             for(j=0, i=0;i<entries;++i) {

  350.                 uint_fast8_t dim=codebook_setup->dimensions;

  351. 

  352.                 if (tmp_vlc_bits[i]) {

  353.                     float last=0.0;

  354.                     uint_fast32_t lookup_offset=i;

  355. 

  356. #ifdef V_DEBUG

  357.                     av_log(vc->avccontext, AV_LOG_INFO, "Lookup offset %d ,", i);

  358. #endif

  359. 

  360.                     for(k=0;k<dim;++k) {

  361.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

  362.                         codebook_setup->codevectors[j*dim+k]=codebook_multiplicands[multiplicand_offset]*codebook_delta_value+codebook_minimum_value+last;

  363.                         if (codebook_sequence_p) {

  364.                             last=codebook_setup->codevectors[j*dim+k];

  365.                         }

  366.                         lookup_offset/=codebook_lookup_values;

  367.                     }

  368.                     tmp_vlc_bits[j]=tmp_vlc_bits[i];

  369. 

  370. #ifdef V_DEBUG

  371.                     av_log(vc->avccontext, AV_LOG_INFO, "real lookup offset %d, vector: ", j);

  372.                     for(k=0;k<dim;++k) {

  373.                         av_log(vc->avccontext, AV_LOG_INFO, " %f ", codebook_setup->codevectors[j*dim+k]);

  374.                     }

  375.                     av_log(vc->avccontext, AV_LOG_INFO, "\n");

  376. #endif

  377. 

  378.                     ++j;

  379.                 }

  380.             }

  381.             if (j!=used_entries) {

  382.                 av_log(vc->avccontext, AV_LOG_ERROR, "Bug in codevector vector building code. \n");

  383.                 goto error;

  384.             }

  385.             entries=used_entries;

  386.         }

  387.         else if (codebook_setup->lookup_type>=2) {

  388.             av_log(vc->avccontext, AV_LOG_ERROR, "Codebook lookup type not supported. \n");

  389.             goto error;

  390.         }

  391. 

  392. // Initialize VLC table

  393.         if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {

  394.             av_log(vc->avccontext, AV_LOG_ERROR, " Invalid code lengths while generating vlcs. \n");

  395.             goto error;

  396.         }

  397.         codebook_setup->maxdepth=0;

  398.         for(t=0;t<entries;++t)

  399.             if (tmp_vlc_bits[t]>=codebook_setup->maxdepth) codebook_setup->maxdepth=tmp_vlc_bits[t];

  400. 

  401.         if(codebook_setup->maxdepth > 3*V_NB_BITS) codebook_setup->nb_bits=V_NB_BITS2;

  402.         else                                       codebook_setup->nb_bits=V_NB_BITS;

  403. 

  404.         codebook_setup->maxdepth=(codebook_setup->maxdepth+codebook_setup->nb_bits-1)/codebook_setup->nb_bits;

  405. 

  406.         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)) {

  407.             av_log(vc->avccontext, AV_LOG_ERROR, " Error generating vlc tables. \n");

  408.             goto error;

  409.         }

  410.     }

  411. 

  412.     av_free(tmp_vlc_bits);

  413.     av_free(tmp_vlc_codes);

  414.     return 0;

  415. 

  416. // Error:

  417. error:

  418.     av_free(tmp_vlc_bits);

  419.     av_free(tmp_vlc_codes);

  420.     return 1;

  421. }

  422. 

  423. // Process time domain transforms part (unused in Vorbis I)

  424. 

  425. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {

  426.     GetBitContext *gb=&vc->gb;

  427.     uint_fast8_t i;

  428.     uint_fast8_t vorbis_time_count=get_bits(gb, 6)+1;

  429. 

  430.     for(i=0;i<vorbis_time_count;++i) {

  431.         uint_fast16_t vorbis_tdtransform=get_bits(gb, 16);

  432. 

  433.         AV_DEBUG(" Vorbis time domain transform %d: %d \n", vorbis_time_count, vorbis_tdtransform);

  434. 

  435.         if (vorbis_tdtransform) {

  436.             av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis time domain transform data nonzero. \n");

  437.             return 1;

  438.         }

  439.     }

  440.     return 0;

  441. }

  442. 

  443. // Process floors part

  444. 

  445. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  446.                                          vorbis_floor_data *vfu, float *vec);

  447. static void create_map( vorbis_context * vc, uint_fast8_t floor_number );

  448. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  449.                                          vorbis_floor_data *vfu, float *vec);

  450. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {

  451.     GetBitContext *gb=&vc->gb;

  452.     uint_fast16_t i,j,k;

  453. 

  454.     vc->floor_count=get_bits(gb, 6)+1;

  455. 

  456.     vc->floors=av_mallocz(vc->floor_count * sizeof(vorbis_floor));

  457. 

  458.     for (i=0;i<vc->floor_count;++i) {

  459.         vorbis_floor *floor_setup=&vc->floors[i];

  460. 

  461.         floor_setup->floor_type=get_bits(gb, 16);

  462. 

  463.         AV_DEBUG(" %d. floor type %d \n", i, floor_setup->floor_type);

  464. 

  465.         if (floor_setup->floor_type==1) {

  466.             uint_fast8_t maximum_class=0;

  467.             uint_fast8_t rangebits;

  468.             uint_fast16_t floor1_values=2;

  469. 

  470.             floor_setup->decode=vorbis_floor1_decode;

  471. 

  472.             floor_setup->data.t1.partitions=get_bits(gb, 5);

  473. 

  474.             AV_DEBUG(" %d.floor: %d partitions \n", i, floor_setup->data.t1.partitions);

  475. 

  476.             for(j=0;j<floor_setup->data.t1.partitions;++j) {

  477.                 floor_setup->data.t1.partition_class[j]=get_bits(gb, 4);

  478.                 if (floor_setup->data.t1.partition_class[j]>maximum_class) maximum_class=floor_setup->data.t1.partition_class[j];

  479. 

  480.                 AV_DEBUG(" %d. floor %d partition class %d \n", i, j, floor_setup->data.t1.partition_class[j]);

  481. 

  482.             }

  483. 

  484.             AV_DEBUG(" maximum class %d \n", maximum_class);

  485. 

  486.             floor_setup->data.t1.maximum_class=maximum_class;

  487. 

  488.             for(j=0;j<=maximum_class;++j) {

  489.                 floor_setup->data.t1.class_dimensions[j]=get_bits(gb, 3)+1;

  490.                 floor_setup->data.t1.class_subclasses[j]=get_bits(gb, 2);

  491. 

  492.                 AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->data.t1.class_dimensions[j], floor_setup->data.t1.class_subclasses[j]);

  493. 

  494.                 if (floor_setup->data.t1.class_subclasses[j]) {

  495.                     int bits=get_bits(gb, 8);

  496.                     if (bits>=vc->codebook_count) {

  497.                         av_log(vc->avccontext, AV_LOG_ERROR, "Masterbook index %d is out of range.\n", bits);

  498.                         return 1;

  499.                     }

  500.                     floor_setup->data.t1.class_masterbook[j]=bits;

  501. 

  502.                     AV_DEBUG("   masterbook: %d \n", floor_setup->data.t1.class_masterbook[j]);

  503.                 }

  504. 

  505.                 for(k=0;k<(1<<floor_setup->data.t1.class_subclasses[j]);++k) {

  506.                     int16_t bits=get_bits(gb, 8)-1;

  507.                     if (bits!=-1 && bits>=vc->codebook_count) {

  508.                         av_log(vc->avccontext, AV_LOG_ERROR, "Subclass book index %d is out of range.\n", bits);

  509.                         return 1;

  510.                     }

  511.                     floor_setup->data.t1.subclass_books[j][k]=bits;

  512. 

  513.                     AV_DEBUG("    book %d. : %d \n", k, floor_setup->data.t1.subclass_books[j][k]);

  514.                 }

  515.             }

  516. 

  517.             floor_setup->data.t1.multiplier=get_bits(gb, 2)+1;

  518.             floor_setup->data.t1.x_list_dim=2;

  519. 

  520.             for(j=0;j<floor_setup->data.t1.partitions;++j) {

  521.                 floor_setup->data.t1.x_list_dim+=floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];

  522.             }

  523. 

  524.             floor_setup->data.t1.list=av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));

  525. 

  526. 

  527.             rangebits=get_bits(gb, 4);

  528.             floor_setup->data.t1.list[0].x = 0;

  529.             floor_setup->data.t1.list[1].x = (1<<rangebits);

  530. 

  531.             for(j=0;j<floor_setup->data.t1.partitions;++j) {

  532.                 for(k=0;k<floor_setup->data.t1.class_dimensions[floor_setup->data.t1.partition_class[j]];++k,++floor1_values) {

  533.                     floor_setup->data.t1.list[floor1_values].x=get_bits(gb, rangebits);

  534. 

  535.                     AV_DEBUG(" %d. floor1 Y coord. %d \n", floor1_values, floor_setup->data.t1.list[floor1_values].x);

  536.                 }

  537.             }

  538. 

  539. // Precalculate order of x coordinates - needed for decode

  540.             ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);

  541.         }

  542.         else if(floor_setup->floor_type==0) {

  543.             uint_fast8_t max_codebook_dim=0;

  544. 

  545.             floor_setup->decode=vorbis_floor0_decode;

  546. 

  547.             floor_setup->data.t0.order=get_bits(gb, 8);

  548.             floor_setup->data.t0.rate=get_bits(gb, 16);

  549.             floor_setup->data.t0.bark_map_size=get_bits(gb, 16);

  550.             floor_setup->data.t0.amplitude_bits=get_bits(gb, 6);

  551.             /* zero would result in a div by zero later *

  552.              * 2^0 - 1 == 0                             */

  553.             if (floor_setup->data.t0.amplitude_bits == 0) {

  554.               av_log(vc->avccontext, AV_LOG_ERROR,

  555.                      "Floor 0 amplitude bits is 0.\n");

  556.               return 1;

  557.             }

  558.             floor_setup->data.t0.amplitude_offset=get_bits(gb, 8);

  559.             floor_setup->data.t0.num_books=get_bits(gb, 4)+1;

  560. 

  561.             /* allocate mem for booklist */

  562.             floor_setup->data.t0.book_list=

  563.                 av_malloc(floor_setup->data.t0.num_books);

  564.             if(!floor_setup->data.t0.book_list) { return 1; }

  565.             /* read book indexes */

  566.             {

  567.                 int idx;

  568.                 uint_fast8_t book_idx;

  569.                 for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {

  570.                     book_idx=get_bits(gb, 8);

  571.                     if (book_idx>=vc->codebook_count)

  572.                         return 1;

  573.                     floor_setup->data.t0.book_list[idx]=book_idx;

  574.                     if (vc->codebooks[book_idx].dimensions > max_codebook_dim)

  575.                         max_codebook_dim=vc->codebooks[book_idx].dimensions;

  576.                 }

  577.             }

  578. 

  579.             create_map( vc, i );

  580. 

  581.             /* allocate mem for lsp coefficients */

  582.             {

  583.                 /* codebook dim is for padding if codebook dim doesn't *

  584.                  * divide order+1 then we need to read more data       */

  585.                 floor_setup->data.t0.lsp=

  586.                     av_malloc((floor_setup->data.t0.order+1 + max_codebook_dim)

  587.                               * sizeof(float));

  588.                 if(!floor_setup->data.t0.lsp) { return 1; }

  589.             }

  590. 

  591. #ifdef V_DEBUG /* debug output parsed headers */

  592.             AV_DEBUG("floor0 order: %u\n", floor_setup->data.t0.order);

  593.             AV_DEBUG("floor0 rate: %u\n", floor_setup->data.t0.rate);

  594.             AV_DEBUG("floor0 bark map size: %u\n",

  595.               floor_setup->data.t0.bark_map_size);

  596.             AV_DEBUG("floor0 amplitude bits: %u\n",

  597.               floor_setup->data.t0.amplitude_bits);

  598.             AV_DEBUG("floor0 amplitude offset: %u\n",

  599.               floor_setup->data.t0.amplitude_offset);

  600.             AV_DEBUG("floor0 number of books: %u\n",

  601.               floor_setup->data.t0.num_books);

  602.             AV_DEBUG("floor0 book list pointer: %p\n",

  603.               floor_setup->data.t0.book_list);

  604.             {

  605.               int idx;

  606.               for (idx=0;idx<floor_setup->data.t0.num_books;++idx) {

  607.                 AV_DEBUG( "  Book %d: %u\n",

  608.                   idx+1,

  609.                   floor_setup->data.t0.book_list[idx] );

  610.               }

  611.             }

  612. #endif

  613.         }

  614.         else {

  615.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid floor type!\n");

  616.             return 1;

  617.         }

  618.     }

  619.     return 0;

  620. }

  621. 

  622. // Process residues part

  623. 

  624. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){

  625.     GetBitContext *gb=&vc->gb;

  626.     uint_fast8_t i, j, k;

  627. 

  628.     vc->residue_count=get_bits(gb, 6)+1;

  629.     vc->residues=av_mallocz(vc->residue_count * sizeof(vorbis_residue));

  630. 

  631.     AV_DEBUG(" There are %d residues. \n", vc->residue_count);

  632. 

  633.     for(i=0;i<vc->residue_count;++i) {

  634.         vorbis_residue *res_setup=&vc->residues[i];

  635.         uint_fast8_t cascade[64];

  636.         uint_fast8_t high_bits;

  637.         uint_fast8_t low_bits;

  638. 

  639.         res_setup->type=get_bits(gb, 16);

  640. 

  641.         AV_DEBUG(" %d. residue type %d \n", i, res_setup->type);

  642. 

  643.         res_setup->begin=get_bits(gb, 24);

  644.         res_setup->end=get_bits(gb, 24);

  645.         res_setup->partition_size=get_bits(gb, 24)+1;

  646.         res_setup->classifications=get_bits(gb, 6)+1;

  647.         res_setup->classbook=get_bits(gb, 8);

  648.         if (res_setup->classbook>=vc->codebook_count) {

  649.             av_log(vc->avccontext, AV_LOG_ERROR, "classbook value %d out of range. \n", res_setup->classbook);

  650.             return 1;

  651.         }

  652. 

  653.         AV_DEBUG("    begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size,

  654.           res_setup->classifications, res_setup->classbook);

  655. 

  656.         for(j=0;j<res_setup->classifications;++j) {

  657.             high_bits=0;

  658.             low_bits=get_bits(gb, 3);

  659.             if (get_bits1(gb)) {

  660.                 high_bits=get_bits(gb, 5);

  661.             }

  662.             cascade[j]=(high_bits<<3)+low_bits;

  663. 

  664.             AV_DEBUG("     %d class casscade depth: %d \n", j, ilog(cascade[j]));

  665.         }

  666. 

  667.         res_setup->maxpass=0;

  668.         for(j=0;j<res_setup->classifications;++j) {

  669.             for(k=0;k<8;++k) {

  670.                 if (cascade[j]&(1<<k)) {

  671.                     int bits=get_bits(gb, 8);

  672.                     if (bits>=vc->codebook_count) {

  673.                         av_log(vc->avccontext, AV_LOG_ERROR, "book value %d out of range. \n", bits);

  674.                         return 1;

  675.                     }

  676.                     res_setup->books[j][k]=bits;

  677. 

  678.                     AV_DEBUG("     %d class casscade depth %d book: %d \n", j, k, res_setup->books[j][k]);

  679. 

  680.                     if (k>res_setup->maxpass) {

  681.                         res_setup->maxpass=k;

  682.                     }

  683.                 } else {

  684.                     res_setup->books[j][k]=-1;

  685.                 }

  686.             }

  687.         }

  688.     }

  689.     return 0;

  690. }

  691. 

  692. // Process mappings part

  693. 

  694. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {

  695.     GetBitContext *gb=&vc->gb;

  696.     uint_fast8_t i, j;

  697. 

  698.     vc->mapping_count=get_bits(gb, 6)+1;

  699.     vc->mappings=av_mallocz(vc->mapping_count * sizeof(vorbis_mapping));

  700. 

  701.     AV_DEBUG(" There are %d mappings. \n", vc->mapping_count);

  702. 

  703.     for(i=0;i<vc->mapping_count;++i) {

  704.         vorbis_mapping *mapping_setup=&vc->mappings[i];

  705. 

  706.         if (get_bits(gb, 16)) {

  707.             av_log(vc->avccontext, AV_LOG_ERROR, "Other mappings than type 0 are not compliant with the Vorbis I specification. \n");

  708.             return 1;

  709.         }

  710.         if (get_bits1(gb)) {

  711.             mapping_setup->submaps=get_bits(gb, 4)+1;

  712.         } else {

  713.             mapping_setup->submaps=1;

  714.         }

  715. 

  716.         if (get_bits1(gb)) {

  717.             mapping_setup->coupling_steps=get_bits(gb, 8)+1;

  718.             mapping_setup->magnitude=av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));

  719.             mapping_setup->angle    =av_mallocz(mapping_setup->coupling_steps * sizeof(uint_fast8_t));

  720.             for(j=0;j<mapping_setup->coupling_steps;++j) {

  721.                 mapping_setup->magnitude[j]=get_bits(gb, ilog(vc->audio_channels-1));

  722.                 mapping_setup->angle[j]=get_bits(gb, ilog(vc->audio_channels-1));

  723.                 if (mapping_setup->magnitude[j]>=vc->audio_channels) {

  724.                     av_log(vc->avccontext, AV_LOG_ERROR, "magnitude channel %d out of range. \n", mapping_setup->magnitude[j]);

  725.                     return 1;

  726.                 }

  727.                 if (mapping_setup->angle[j]>=vc->audio_channels) {

  728.                     av_log(vc->avccontext, AV_LOG_ERROR, "angle channel %d out of range. \n", mapping_setup->angle[j]);

  729.                     return 1;

  730.                 }

  731.             }

  732.         } else {

  733.             mapping_setup->coupling_steps=0;

  734.         }

  735. 

  736.         AV_DEBUG("   %d mapping coupling steps: %d \n", i, mapping_setup->coupling_steps);

  737. 

  738.         if(get_bits(gb, 2)) {

  739.             av_log(vc->avccontext, AV_LOG_ERROR, "%d. mapping setup data invalid. \n", i);

  740.             return 1; // following spec.

  741.         }

  742. 

  743.         if (mapping_setup->submaps>1) {

  744.             mapping_setup->mux=av_mallocz(vc->audio_channels * sizeof(uint_fast8_t));

  745.             for(j=0;j<vc->audio_channels;++j) {

  746.                 mapping_setup->mux[j]=get_bits(gb, 4);

  747.             }

  748.         }

  749. 

  750.         for(j=0;j<mapping_setup->submaps;++j) {

  751.             skip_bits(gb, 8); // FIXME check?

  752.             mapping_setup->submap_floor[j]=get_bits(gb, 8);

  753.             mapping_setup->submap_residue[j]=get_bits(gb, 8);

  754. 

  755.             AV_DEBUG("   %d mapping %d submap : floor %d, residue %d \n", i, j, mapping_setup->submap_floor[j], mapping_setup->submap_residue[j]);

  756.         }

  757.     }

  758.     return 0;

  759. }

  760. 

  761. // Process modes part

  762. 

  763. static void create_map( vorbis_context * vc, uint_fast8_t floor_number )

  764. {

  765.     vorbis_floor * floors=vc->floors;

  766.     vorbis_floor0 * vf;

  767.     int idx;

  768.     int_fast8_t blockflag;

  769.     int_fast32_t * map;

  770.     int_fast32_t n; //TODO: could theoretically be smaller?

  771. 

  772.     for (blockflag=0;blockflag<2;++blockflag)

  773.     {

  774.     n=vc->blocksize[blockflag]/2;

  775.     floors[floor_number].data.t0.map[blockflag]=

  776.         av_malloc((n+1) * sizeof(int_fast32_t)); // n+sentinel

  777. 

  778.     map=floors[floor_number].data.t0.map[blockflag];

  779.     vf=&floors[floor_number].data.t0;

  780. 

  781.     for (idx=0; idx<n;++idx) {

  782.         map[idx]=floor( BARK((vf->rate*idx)/(2.0f*n)) *

  783.                               ((vf->bark_map_size)/

  784.                                BARK(vf->rate/2.0f )) );

  785.         if (vf->bark_map_size-1 < map[idx]) {

  786.             map[idx]=vf->bark_map_size-1;

  787.         }

  788.     }

  789.     map[n]=-1;

  790.     vf->map_size[blockflag]=n;

  791.     }

  792. 

  793. #   ifdef V_DEBUG

  794.     for(idx=0;idx<=n;++idx) {

  795.         AV_DEBUG("floor0 map: map at pos %d is %d\n",

  796.                  idx, map[idx]);

  797.     }

  798. #   endif

  799. }

  800. 

  801. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {

  802.     GetBitContext *gb=&vc->gb;

  803.     uint_fast8_t i;

  804. 

  805.     vc->mode_count=get_bits(gb, 6)+1;

  806.     vc->modes=av_mallocz(vc->mode_count * sizeof(vorbis_mode));

  807. 

  808.     AV_DEBUG(" There are %d modes.\n", vc->mode_count);

  809. 

  810.     for(i=0;i<vc->mode_count;++i) {

  811.         vorbis_mode *mode_setup=&vc->modes[i];

  812. 

  813.         mode_setup->blockflag=get_bits1(gb);

  814.         mode_setup->windowtype=get_bits(gb, 16); //FIXME check

  815.         mode_setup->transformtype=get_bits(gb, 16); //FIXME check

  816.         mode_setup->mapping=get_bits(gb, 8);

  817.         if (mode_setup->mapping>=vc->mapping_count) {

  818.             av_log(vc->avccontext, AV_LOG_ERROR, "mode mapping value %d out of range. \n", mode_setup->mapping);

  819.             return 1;

  820.         }

  821. 

  822.         AV_DEBUG(" %d mode: blockflag %d, windowtype %d, transformtype %d, mapping %d \n", i, mode_setup->blockflag, mode_setup->windowtype, mode_setup->transformtype, mode_setup->mapping);

  823.     }

  824.     return 0;

  825. }

  826. 

  827. // Process the whole setup header using the functions above

  828. 

  829. static int vorbis_parse_setup_hdr(vorbis_context *vc) {

  830.     GetBitContext *gb=&vc->gb;

  831. 

  832.     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||

  833.     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||

  834.     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {

  835.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (no vorbis signature). \n");

  836.         return 1;

  837.     }

  838. 

  839.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

  840.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (codebooks). \n");

  841.         return 2;

  842.     }

  843.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

  844.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (time domain transforms). \n");

  845.         return 3;

  846.     }

  847.     if (vorbis_parse_setup_hdr_floors(vc)) {

  848.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (floors). \n");

  849.         return 4;

  850.     }

  851.     if (vorbis_parse_setup_hdr_residues(vc)) {

  852.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (residues). \n");

  853.         return 5;

  854.     }

  855.     if (vorbis_parse_setup_hdr_mappings(vc)) {

  856.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (mappings). \n");

  857.         return 6;

  858.     }

  859.     if (vorbis_parse_setup_hdr_modes(vc)) {

  860.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (modes). \n");

  861.         return 7;

  862.     }

  863.     if (!get_bits1(gb)) {

  864.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis setup header packet corrupt (framing flag). \n");

  865.         return 8; // framing flag bit unset error

  866.     }

  867. 

  868.     return 0;

  869. }

  870. 

  871. // Process the identification header

  872. 

  873. static int vorbis_parse_id_hdr(vorbis_context *vc){

  874.     GetBitContext *gb=&vc->gb;

  875.     uint_fast8_t bl0, bl1;

  876. 

  877.     if ((get_bits(gb, 8)!='v') || (get_bits(gb, 8)!='o') ||

  878.     (get_bits(gb, 8)!='r') || (get_bits(gb, 8)!='b') ||

  879.     (get_bits(gb, 8)!='i') || (get_bits(gb, 8)!='s')) {

  880.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (no vorbis signature). \n");

  881.         return 1;

  882.     }

  883. 

  884.     vc->version=get_bits_long(gb, 32);    //FIXME check 0

  885.     vc->audio_channels=get_bits(gb, 8);   //FIXME check >0

  886.     vc->audio_samplerate=get_bits_long(gb, 32);   //FIXME check >0

  887.     vc->bitrate_maximum=get_bits_long(gb, 32);

  888.     vc->bitrate_nominal=get_bits_long(gb, 32);

  889.     vc->bitrate_minimum=get_bits_long(gb, 32);

  890.     bl0=get_bits(gb, 4);

  891.     bl1=get_bits(gb, 4);

  892.     vc->blocksize[0]=(1<<bl0);

  893.     vc->blocksize[1]=(1<<bl1);

  894.     if (bl0>13 || bl0<6 || bl1>13 || bl1<6 || bl1<bl0) {

  895.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (illegal blocksize). \n");

  896.         return 3;

  897.     }

  898.     // output format int16

  899.     if (vc->blocksize[1]/2 * vc->audio_channels * 2 >

  900.                                              AVCODEC_MAX_AUDIO_FRAME_SIZE) {

  901.         av_log(vc->avccontext, AV_LOG_ERROR, "Vorbis channel count makes "

  902.                "output packets too large.\n");

  903.         return 4;

  904.     }

  905.     vc->win[0]=ff_vorbis_vwin[bl0-6];

  906.     vc->win[1]=ff_vorbis_vwin[bl1-6];

  907. 

  908.     if(vc->exp_bias){

  909.         int i, j;

  910.         for(j=0; j<2; j++){

  911.             float *win = av_malloc(vc->blocksize[j]/2 * sizeof(float));

  912.             for(i=0; i<vc->blocksize[j]/2; i++)

  913.                 win[i] = vc->win[j][i] * (1<<15);

  914.             vc->win[j] = win;

  915.         }

  916.     }

  917. 

  918.     if ((get_bits1(gb)) == 0) {

  919.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");

  920.         return 2;

  921.     }

  922. 

  923.     vc->channel_residues= av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));

  924.     vc->channel_floors  = av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));

  925.     vc->saved           = av_mallocz((vc->blocksize[1]/4)*vc->audio_channels * sizeof(float));

  926.     vc->previous_window=0;

  927. 

  928.     ff_mdct_init(&vc->mdct[0], bl0, 1);

  929.     ff_mdct_init(&vc->mdct[1], bl1, 1);

  930. 

  931.     AV_DEBUG(" vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",

  932.             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);

  933. 

  934. /*

  935.     BLK=vc->blocksize[0];

  936.     for(i=0;i<BLK/2;++i) {

  937.         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)));

  938.     }

  939. */

  940. 

  941.     return 0;

  942. }

  943. 

  944. // Process the extradata using the functions above (identification header, setup header)

  945. 

  946. static av_cold int vorbis_decode_init(AVCodecContext *avccontext) {

  947.     vorbis_context *vc = avccontext->priv_data ;

  948.     uint8_t *headers = avccontext->extradata;

  949.     int headers_len=avccontext->extradata_size;

  950.     uint8_t *header_start[3];

  951.     int header_len[3];

  952.     GetBitContext *gb = &(vc->gb);

  953.     int hdr_type;

  954. 

  955.     vc->avccontext = avccontext;

  956.     dsputil_init(&vc->dsp, avccontext);

  957. 

  958.     if(vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {

  959.         vc->add_bias = 385;

  960.         vc->exp_bias = 0;

  961.     } else {

  962.         vc->add_bias = 0;

  963.         vc->exp_bias = 15<<23;

  964.     }

  965. 

  966.     if (!headers_len) {

  967.         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");

  968.         return -1;

  969.     }

  970. 

  971.     if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {

  972.         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");

  973.         return -1;

  974.     }

  975. 

  976.     init_get_bits(gb, header_start[0], header_len[0]*8);

  977.     hdr_type=get_bits(gb, 8);

  978.     if (hdr_type!=1) {

  979.         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");

  980.         return -1;

  981.     }

  982.     if (vorbis_parse_id_hdr(vc)) {

  983.         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");

  984.         vorbis_free(vc);

  985.         return -1;

  986.     }

  987. 

  988.     init_get_bits(gb, header_start[2], header_len[2]*8);

  989.     hdr_type=get_bits(gb, 8);

  990.     if (hdr_type!=5) {

  991.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  992.         vorbis_free(vc);

  993.         return -1;

  994.     }

  995.     if (vorbis_parse_setup_hdr(vc)) {

  996.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  997.         vorbis_free(vc);

  998.         return -1;

  999.     }

  1000. 

  1001.     avccontext->channels = vc->audio_channels;

  1002.     avccontext->sample_rate = vc->audio_samplerate;

  1003.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1])>>2;

  1004.     avccontext->sample_fmt = SAMPLE_FMT_S16;

  1005. 

  1006.     return 0 ;

  1007. }

  1008. 

  1009. // Decode audiopackets -------------------------------------------------

  1010. 

  1011. // Read and decode floor

  1012. 

  1013. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  1014.                                          vorbis_floor_data *vfu, float *vec) {

  1015.     vorbis_floor0 * vf=&vfu->t0;

  1016.     float * lsp=vf->lsp;

  1017.     uint_fast32_t amplitude;

  1018.     uint_fast32_t book_idx;

  1019.     uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;

  1020. 

  1021.     amplitude=get_bits(&vc->gb, vf->amplitude_bits);

  1022.     if (amplitude>0) {

  1023.         float last = 0;

  1024.         uint_fast16_t lsp_len = 0;

  1025.         uint_fast16_t idx;

  1026.         vorbis_codebook codebook;

  1027. 

  1028.         book_idx=get_bits(&vc->gb, ilog(vf->num_books));

  1029.         if ( book_idx >= vf->num_books ) {

  1030.             av_log( vc->avccontext, AV_LOG_ERROR,

  1031.                     "floor0 dec: booknumber too high!\n" );

  1032.             book_idx= 0;

  1033.             //FIXME: look above

  1034.         }

  1035.         AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );

  1036.         codebook=vc->codebooks[vf->book_list[book_idx]];

  1037. 

  1038.         while (lsp_len<vf->order) {

  1039.             int vec_off;

  1040. 

  1041.             AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );

  1042.             AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );

  1043.             /* read temp vector */

  1044.             vec_off=get_vlc2(&vc->gb,

  1045.                              codebook.vlc.table,

  1046.                              codebook.nb_bits,

  1047.                              codebook.maxdepth ) *

  1048.                              codebook.dimensions;

  1049.             AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );

  1050.             /* copy each vector component and add last to it */

  1051.             for (idx=0; idx<codebook.dimensions; ++idx) {

  1052.                 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;

  1053.             }

  1054.             last=lsp[lsp_len+idx-1]; /* set last to last vector component */

  1055. 

  1056.             lsp_len += codebook.dimensions;

  1057.         }

  1058. #ifdef V_DEBUG

  1059.         /* DEBUG: output lsp coeffs */

  1060.         {

  1061.             int idx;

  1062.             for ( idx = 0; idx < lsp_len; ++idx )

  1063.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );

  1064.         }

  1065. #endif

  1066. 

  1067.         /* synthesize floor output vector */

  1068.         {

  1069.             int i;

  1070.             int order=vf->order;

  1071.             float wstep=M_PI/vf->bark_map_size;

  1072. 

  1073.             for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }

  1074. 

  1075.             AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",

  1076.                      vf->map_size, order, wstep);

  1077. 

  1078.             i=0;

  1079.             while(i<vf->map_size[blockflag]) {

  1080.                 int j, iter_cond=vf->map[blockflag][i];

  1081.                 float p=0.5f;

  1082.                 float q=0.5f;

  1083.                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times

  1084. 

  1085.                 /* similar part for the q and p products */

  1086.                 for(j=0;j<order;j+=2) {

  1087.                     q *= lsp[j]  -two_cos_w;

  1088.                     p *= lsp[j+1]-two_cos_w;

  1089.                 }

  1090.                 if(j==order) { // even order

  1091.                     p *= p*(2.0f-two_cos_w);

  1092.                     q *= q*(2.0f+two_cos_w);

  1093.                 }

  1094.                 else { // odd order

  1095.                     q *= two_cos_w-lsp[j]; // one more time for q

  1096. 

  1097.                     /* final step and square */

  1098.                     p *= p*(4.f-two_cos_w*two_cos_w);

  1099.                     q *= q;

  1100.                 }

  1101. 

  1102.                 /* calculate linear floor value */

  1103.                 {

  1104.                     q=exp( (

  1105.                              ( (amplitude*vf->amplitude_offset)/

  1106.                                (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )

  1107.                              - vf->amplitude_offset ) * .11512925f

  1108.                          );

  1109.                 }

  1110. 

  1111.                 /* fill vector */

  1112.                 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);

  1113.             }

  1114.         }

  1115.     }

  1116.     else {

  1117.         /* this channel is unused */

  1118.         return 1;

  1119.     }

  1120. 

  1121.     AV_DEBUG(" Floor0 decoded\n");

  1122. 

  1123.     return 0;

  1124. }

  1125. 

  1126. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {

  1127.     vorbis_floor1 * vf=&vfu->t1;

  1128.     GetBitContext *gb=&vc->gb;

  1129.     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };

  1130.     uint_fast16_t range=range_v[vf->multiplier-1];

  1131.     uint_fast16_t floor1_Y[vf->x_list_dim];

  1132.     uint_fast16_t floor1_Y_final[vf->x_list_dim];

  1133.     int floor1_flag[vf->x_list_dim];

  1134.     uint_fast8_t class_;

  1135.     uint_fast8_t cdim;

  1136.     uint_fast8_t cbits;

  1137.     uint_fast8_t csub;

  1138.     uint_fast8_t cval;

  1139.     int_fast16_t book;

  1140.     uint_fast16_t offset;

  1141.     uint_fast16_t i,j;

  1142.     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?

  1143.     int_fast16_t dy, err;

  1144. 

  1145. 

  1146.     if (!get_bits1(gb)) return 1; // silence

  1147. 

  1148. // Read values (or differences) for the floor's points

  1149. 

  1150.     floor1_Y[0]=get_bits(gb, ilog(range-1));

  1151.     floor1_Y[1]=get_bits(gb, ilog(range-1));

  1152. 

  1153.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1154. 

  1155.     offset=2;

  1156.     for(i=0;i<vf->partitions;++i) {

  1157.         class_=vf->partition_class[i];

  1158.         cdim=vf->class_dimensions[class_];

  1159.         cbits=vf->class_subclasses[class_];

  1160.         csub=(1<<cbits)-1;

  1161.         cval=0;

  1162. 

  1163.         AV_DEBUG("Cbits %d \n", cbits);

  1164. 

  1165.         if (cbits) { // this reads all subclasses for this partition's class

  1166.             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,

  1167.             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);

  1168.         }

  1169. 

  1170.         for(j=0;j<cdim;++j) {

  1171.             book=vf->subclass_books[class_][cval & csub];

  1172. 

  1173.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1174. 

  1175.             cval=cval>>cbits;

  1176.             if (book>-1) {

  1177.                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,

  1178.                 vc->codebooks[book].nb_bits, 3);

  1179.             } else {

  1180.                 floor1_Y[offset+j]=0;

  1181.             }

  1182. 

  1183.             AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);

  1184.         }

  1185.         offset+=cdim;

  1186.     }

  1187. 

  1188. // Amplitude calculation from the differences

  1189. 

  1190.     floor1_flag[0]=1;

  1191.     floor1_flag[1]=1;

  1192.     floor1_Y_final[0]=floor1_Y[0];

  1193.     floor1_Y_final[1]=floor1_Y[1];

  1194. 

  1195.     for(i=2;i<vf->x_list_dim;++i) {

  1196.         uint_fast16_t val, highroom, lowroom, room;

  1197.         uint_fast16_t high_neigh_offs;

  1198.         uint_fast16_t low_neigh_offs;

  1199. 

  1200.         low_neigh_offs=vf->list[i].low;

  1201.         high_neigh_offs=vf->list[i].high;

  1202.         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin

  1203.         adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;

  1204.         ady= FFABS(dy);

  1205.         err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);

  1206.         off=(int16_t)err/(int16_t)adx;

  1207.         if (dy<0) {

  1208.             predicted=floor1_Y_final[low_neigh_offs]-off;

  1209.         } else {

  1210.             predicted=floor1_Y_final[low_neigh_offs]+off;

  1211.         } // render_point end

  1212. 

  1213.         val=floor1_Y[i];

  1214.         highroom=range-predicted;

  1215.         lowroom=predicted;

  1216.         if (highroom < lowroom) {

  1217.             room=highroom*2;

  1218.         } else {

  1219.             room=lowroom*2;   // SPEC mispelling

  1220.         }

  1221.         if (val) {

  1222.             floor1_flag[low_neigh_offs]=1;

  1223.             floor1_flag[high_neigh_offs]=1;

  1224.             floor1_flag[i]=1;

  1225.             if (val>=room) {

  1226.                 if (highroom > lowroom) {

  1227.                     floor1_Y_final[i]=val-lowroom+predicted;

  1228.                 } else {

  1229.                     floor1_Y_final[i]=predicted-val+highroom-1;

  1230.                 }

  1231.             } else {

  1232.                 if (val & 1) {

  1233.                     floor1_Y_final[i]=predicted-(val+1)/2;

  1234.                 } else {

  1235.                     floor1_Y_final[i]=predicted+val/2;

  1236.                 }

  1237.             }

  1238.         } else {

  1239.             floor1_flag[i]=0;

  1240.             floor1_Y_final[i]=predicted;

  1241.         }

  1242. 

  1243.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);

  1244.     }

  1245. 

  1246. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1247. 

  1248.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1249. 

  1250.     AV_DEBUG(" Floor decoded\n");

  1251. 

  1252.     return 0;

  1253. }

  1254. 

  1255. // Read and decode residue

  1256. 

  1257. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen, int vr_type) {

  1258.     GetBitContext *gb=&vc->gb;

  1259.     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;

  1260.     uint_fast16_t n_to_read=vr->end-vr->begin;

  1261.     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;

  1262.     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];

  1263.     uint_fast8_t pass;

  1264.     uint_fast8_t ch_used;

  1265.     uint_fast8_t i,j,l;

  1266.     uint_fast16_t k;

  1267. 

  1268.     if (vr_type==2) {

  1269.         for(j=1;j<ch;++j) {

  1270.                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input

  1271.         }

  1272.         if (do_not_decode[0]) return 0;

  1273.         ch_used=1;

  1274.     } else {

  1275.         ch_used=ch;

  1276.     }

  1277. 

  1278.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1279. 

  1280.     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?

  1281.         uint_fast16_t voffset;

  1282.         uint_fast16_t partition_count;

  1283.         uint_fast16_t j_times_ptns_to_read;

  1284. 

  1285.         voffset=vr->begin;

  1286.         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error

  1287.             if (!pass) {

  1288.                 uint_fast32_t inverse_class = ff_inverse[vr->classifications];

  1289.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1290.                     if (!do_not_decode[j]) {

  1291.                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1292.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1293. 

  1294.                         AV_DEBUG("Classword: %d \n", temp);

  1295. 

  1296.                         assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]

  1297.                         for(i=0;i<c_p_c;++i) {

  1298.                             uint_fast32_t temp2;

  1299. 

  1300.                             temp2=(((uint_fast64_t)temp) * inverse_class)>>32;

  1301.                             if (partition_count+c_p_c-1-i < ptns_to_read) {

  1302.                                 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;

  1303.                             }

  1304.                             temp=temp2;

  1305.                         }

  1306.                     }

  1307.                     j_times_ptns_to_read+=ptns_to_read;

  1308.                 }

  1309.             }

  1310.             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {

  1311.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1312.                     uint_fast16_t voffs;

  1313. 

  1314.                     if (!do_not_decode[j]) {

  1315.                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];

  1316.                         int_fast16_t vqbook=vr->books[vqclass][pass];

  1317. 

  1318.                         if (vqbook>=0 && vc->codebooks[vqbook].codevectors) {

  1319.                             uint_fast16_t coffs;

  1320.                             unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64

  1321.                             uint_fast16_t step= dim==1 ? vr->partition_size

  1322.                                               : FASTDIV(vr->partition_size, dim);

  1323.                             vorbis_codebook codebook= vc->codebooks[vqbook];

  1324. 

  1325.                             if (vr_type==0) {

  1326. 

  1327.                                 voffs=voffset+j*vlen;

  1328.                                 for(k=0;k<step;++k) {

  1329.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1330.                                     for(l=0;l<dim;++l) {

  1331.                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH

  1332.                                     }

  1333.                                 }

  1334.                             }

  1335.                             else if (vr_type==1) {

  1336.                                 voffs=voffset+j*vlen;

  1337.                                 for(k=0;k<step;++k) {

  1338.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1339.                                     for(l=0;l<dim;++l, ++voffs) {

  1340.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1341. 

  1342.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1343.                                     }

  1344.                                 }

  1345.                             }

  1346.                             else if (vr_type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized

  1347.                                 voffs=voffset>>1;

  1348. 

  1349.                                 if(dim==2) {

  1350.                                     for(k=0;k<step;++k) {

  1351.                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1352.                                         vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH

  1353.                                         vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH

  1354.                                     }

  1355.                                 } else if(dim==4) {

  1356.                                     for(k=0;k<step;++k, voffs+=2) {

  1357.                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1358.                                         vec[voffs       ]+=codebook.codevectors[coffs  ];  // FPMATH

  1359.                                         vec[voffs+1     ]+=codebook.codevectors[coffs+2];  // FPMATH

  1360.                                         vec[voffs+vlen  ]+=codebook.codevectors[coffs+1];  // FPMATH

  1361.                                         vec[voffs+vlen+1]+=codebook.codevectors[coffs+3];  // FPMATH

  1362.                                     }

  1363.                                 } else

  1364.                                 for(k=0;k<step;++k) {

  1365.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1366.                                     for(l=0;l<dim;l+=2, voffs++) {

  1367.                                         vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH

  1368.                                         vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH

  1369. 

  1370.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);

  1371.                                     }

  1372.                                 }

  1373. 

  1374.                             }

  1375.                             else if (vr_type==2) {

  1376.                                 voffs=voffset;

  1377. 

  1378.                                 for(k=0;k<step;++k) {

  1379.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1380.                                     for(l=0;l<dim;++l, ++voffs) {

  1381.                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %

  1382. 

  1383.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);

  1384.                                     }

  1385.                                 }

  1386.                             }

  1387.                         }

  1388.                     }

  1389.                     j_times_ptns_to_read+=ptns_to_read;

  1390.                 }

  1391.                 ++partition_count;

  1392.                 voffset+=vr->partition_size;

  1393.             }

  1394.         }

  1395.     }

  1396.     return 0;

  1397. }

  1398. 

  1399. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen)

  1400. {

  1401.     if (vr->type==2)

  1402.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1403.     else if (vr->type==1)

  1404.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1405.     else if (vr->type==0)

  1406.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1407.     else {

  1408.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1409.         return 1;

  1410.     }

  1411. }

  1412. 

  1413. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1414. {

  1415.     int i;

  1416.     for(i=0; i<blocksize; i++)

  1417.     {

  1418.         if (mag[i]>0.0) {

  1419.             if (ang[i]>0.0) {

  1420.                 ang[i]=mag[i]-ang[i];

  1421.             } else {

  1422.                 float temp=ang[i];

  1423.                 ang[i]=mag[i];

  1424.                 mag[i]+=temp;

  1425.             }

  1426.         } else {

  1427.             if (ang[i]>0.0) {

  1428.                 ang[i]+=mag[i];

  1429.             } else {

  1430.                 float temp=ang[i];

  1431.                 ang[i]=mag[i];

  1432.                 mag[i]-=temp;

  1433.             }

  1434.         }

  1435.     }

  1436. }

  1437. 

  1438. static void copy_normalize(float *dst, float *src, int len, int exp_bias, float add_bias)

  1439. {

  1440.     int i;

  1441.     if(exp_bias) {

  1442.         for(i=0; i<len; i++)

  1443.             ((uint32_t*)dst)[i] = ((uint32_t*)src)[i] + exp_bias; // dst[k]=src[i]*(1<<bias)

  1444.     } else {

  1445.         for(i=0; i<len; i++)

  1446.             dst[i] = src[i] + add_bias;

  1447.     }

  1448. }

  1449. 

  1450. // Decode the audio packet using the functions above

  1451. 

  1452. static int vorbis_parse_audio_packet(vorbis_context *vc) {

  1453.     GetBitContext *gb=&vc->gb;

  1454. 

  1455.     uint_fast8_t previous_window=vc->previous_window;

  1456.     uint_fast8_t mode_number;

  1457.     uint_fast8_t blockflag;

  1458.     uint_fast16_t blocksize;

  1459.     int_fast32_t i,j;

  1460.     uint_fast8_t no_residue[vc->audio_channels];

  1461.     uint_fast8_t do_not_decode[vc->audio_channels];

  1462.     vorbis_mapping *mapping;

  1463.     float *ch_res_ptr=vc->channel_residues;

  1464.     float *ch_floor_ptr=vc->channel_floors;

  1465.     uint_fast8_t res_chan[vc->audio_channels];

  1466.     uint_fast8_t res_num=0;

  1467.     int_fast16_t retlen=0;

  1468.     float fadd_bias = vc->add_bias;

  1469. 

  1470.     if (get_bits1(gb)) {

  1471.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1472.         return -1; // packet type not audio

  1473.     }

  1474. 

  1475.     if (vc->mode_count==1) {

  1476.         mode_number=0;

  1477.     } else {

  1478.         mode_number=get_bits(gb, ilog(vc->mode_count-1));

  1479.     }

  1480.     if (mode_number>=vc->mode_count) {

  1481.         av_log(vc->avccontext, AV_LOG_ERROR, "mode number %d out of range.\n", mode_number);

  1482.         return -1;

  1483.     }

  1484.     vc->mode_number=mode_number;

  1485.     mapping=&vc->mappings[vc->modes[mode_number].mapping];

  1486. 

  1487.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1488. 

  1489.     blockflag=vc->modes[mode_number].blockflag;

  1490.     blocksize=vc->blocksize[blockflag];

  1491.     if (blockflag) {

  1492.         skip_bits(gb, 2); // previous_window, next_window

  1493.     }

  1494. 

  1495.     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1496.     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1497. 

  1498. // Decode floor

  1499. 

  1500.     for(i=0;i<vc->audio_channels;++i) {

  1501.         vorbis_floor *floor;

  1502.         if (mapping->submaps>1) {

  1503.             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1504.         } else {

  1505.             floor=&vc->floors[mapping->submap_floor[0]];

  1506.         }

  1507. 

  1508.         no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);

  1509.         ch_floor_ptr+=blocksize/2;

  1510.     }

  1511. 

  1512. // Nonzero vector propagate

  1513. 

  1514.     for(i=mapping->coupling_steps-1;i>=0;--i) {

  1515.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1516.             no_residue[mapping->magnitude[i]]=0;

  1517.             no_residue[mapping->angle[i]]=0;

  1518.         }

  1519.     }

  1520. 

  1521. // Decode residue

  1522. 

  1523.     for(i=0;i<mapping->submaps;++i) {

  1524.         vorbis_residue *residue;

  1525.         uint_fast8_t ch=0;

  1526. 

  1527.         for(j=0;j<vc->audio_channels;++j) {

  1528.             if ((mapping->submaps==1) || (i==mapping->mux[j])) {

  1529.                 res_chan[j]=res_num;

  1530.                 if (no_residue[j]) {

  1531.                     do_not_decode[ch]=1;

  1532.                 } else {

  1533.                     do_not_decode[ch]=0;

  1534.                 }

  1535.                 ++ch;

  1536.                 ++res_num;

  1537.             }

  1538.         }

  1539.         residue=&vc->residues[mapping->submap_residue[i]];

  1540.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1541. 

  1542.         ch_res_ptr+=ch*blocksize/2;

  1543.     }

  1544. 

  1545. // Inverse coupling

  1546. 

  1547.     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed

  1548.         float *mag, *ang;

  1549. 

  1550.         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;

  1551.         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;

  1552.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);

  1553.     }

  1554. 

  1555. // Dotproduct, MDCT

  1556. 

  1557.     for(j=vc->audio_channels-1;j>=0;j--) {

  1558.         ch_floor_ptr=vc->channel_floors+j*blocksize/2;

  1559.         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;

  1560.         vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);

  1561.         ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);

  1562.     }

  1563. 

  1564. // Overlap/add, save data for next overlapping  FPMATH

  1565. 

  1566.     retlen = (blocksize + vc->blocksize[previous_window])/4;

  1567.     for(j=0;j<vc->audio_channels;j++) {

  1568.         uint_fast16_t bs0=vc->blocksize[0];

  1569.         uint_fast16_t bs1=vc->blocksize[1];

  1570.         float *residue=vc->channel_residues+res_chan[j]*blocksize/2;

  1571.         float *saved=vc->saved+j*bs1/4;

  1572.         float *ret=vc->channel_floors+j*retlen;

  1573.         float *buf=residue;

  1574.         const float *win=vc->win[blockflag&previous_window];

  1575. 

  1576.         if(blockflag == previous_window) {

  1577.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize/4);

  1578.         } else if(blockflag > previous_window) {

  1579.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0/4);

  1580.             copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);

  1581.         } else {

  1582.             copy_normalize(ret, saved, (bs1-bs0)/4, vc->exp_bias, fadd_bias);

  1583.             vc->dsp.vector_fmul_window(ret+(bs1-bs0)/4, saved+(bs1-bs0)/4, buf, win, fadd_bias, bs0/4);

  1584.         }

  1585.         memcpy(saved, buf+blocksize/4, blocksize/4*sizeof(float));

  1586.     }

  1587. 

  1588.     vc->previous_window = blockflag;

  1589.     return retlen;

  1590. }

  1591. 

  1592. // Return the decoded audio packet through the standard api

  1593. 

  1594. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1595.                         void *data, int *data_size,

  1596.                         const uint8_t *buf, int buf_size)

  1597. {

  1598.     vorbis_context *vc = avccontext->priv_data ;

  1599.     GetBitContext *gb = &(vc->gb);

  1600.     const float *channel_ptrs[vc->audio_channels];

  1601.     int i;

  1602. 

  1603.     int_fast16_t len;

  1604. 

  1605.     if(!buf_size){

  1606.         return 0;

  1607.     }

  1608. 

  1609.     AV_DEBUG("packet length %d \n", buf_size);

  1610. 

  1611.     init_get_bits(gb, buf, buf_size*8);

  1612. 

  1613.     len=vorbis_parse_audio_packet(vc);

  1614. 

  1615.     if (len<=0) {

  1616.         *data_size=0;

  1617.         return buf_size;

  1618.     }

  1619. 

  1620.     if (!vc->first_frame) {

  1621.         vc->first_frame=1;

  1622.         *data_size=0;

  1623.         return buf_size ;

  1624.     }

  1625. 

  1626.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1627. 

  1628.     for(i=0; i<vc->audio_channels; i++)

  1629.         channel_ptrs[i] = vc->channel_floors+i*len;

  1630.     vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);

  1631.     *data_size=len*2*vc->audio_channels;

  1632. 

  1633.     return buf_size ;

  1634. }

  1635. 

  1636. // Close decoder

  1637. 

  1638. static av_cold int vorbis_decode_close(AVCodecContext *avccontext) {

  1639.     vorbis_context *vc = avccontext->priv_data;

  1640. 

  1641.     vorbis_free(vc);

  1642. 

  1643.     return 0 ;

  1644. }

  1645. 

  1646. AVCodec vorbis_decoder = {

  1647.     "vorbis",

  1648.     CODEC_TYPE_AUDIO,

  1649.     CODEC_ID_VORBIS,

  1650.     sizeof(vorbis_context),

  1651.     vorbis_decode_init,

  1652.     NULL,

  1653.     vorbis_decode_close,

  1654.     vorbis_decode_frame,

  1655.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1656. };