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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. #define V_MAX_PARTITIONS (1<<20)

  41. 

  42. #ifndef V_DEBUG

  43. #define AV_DEBUG(...)

  44. #endif

  45. 

  46. #undef NDEBUG

  47. #include <assert.h>

  48. 

  49. typedef struct {

  50.     uint_fast8_t dimensions;

  51.     uint_fast8_t lookup_type;

  52.     uint_fast8_t maxdepth;

  53.     VLC vlc;

  54.     float *codevectors;

  55.     unsigned int nb_bits;

  56. } vorbis_codebook;

  57. 

  58. typedef union vorbis_floor_u vorbis_floor_data;

  59. typedef struct vorbis_floor0_s vorbis_floor0;

  60. typedef struct vorbis_floor1_s vorbis_floor1;

  61. struct vorbis_context_s;

  62. typedef

  63. uint_fast8_t (* vorbis_floor_decode_func)

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

  65. typedef struct {

  66.     uint_fast8_t floor_type;

  67.     vorbis_floor_decode_func decode;

  68.     union vorbis_floor_u

  69.     {

  70.         struct vorbis_floor0_s

  71.         {

  72.             uint_fast8_t order;

  73.             uint_fast16_t rate;

  74.             uint_fast16_t bark_map_size;

  75.             int_fast32_t * map[2];

  76.             uint_fast32_t map_size[2];

  77.             uint_fast8_t amplitude_bits;

  78.             uint_fast8_t amplitude_offset;

  79.             uint_fast8_t num_books;

  80.             uint_fast8_t * book_list;

  81.             float * lsp;

  82.         } t0;

  83.         struct vorbis_floor1_s

  84.         {

  85.             uint_fast8_t partitions;

  86.             uint_fast8_t maximum_class;

  87.             uint_fast8_t partition_class[32];

  88.             uint_fast8_t class_dimensions[16];

  89.             uint_fast8_t class_subclasses[16];

  90.             uint_fast8_t class_masterbook[16];

  91.             int_fast16_t subclass_books[16][8];

  92.             uint_fast8_t multiplier;

  93.             uint_fast16_t x_list_dim;

  94.             vorbis_floor1_entry * list;

  95.         } t1;

  96.     } data;

  97. } vorbis_floor;

  98. 

  99. typedef struct {

  100.     uint_fast16_t type;

  101.     uint_fast32_t begin;

  102.     uint_fast32_t end;

  103.     uint_fast32_t partition_size;

  104.     uint_fast8_t classifications;

  105.     uint_fast8_t classbook;

  106.     int_fast16_t books[64][8];

  107.     uint_fast8_t maxpass;

  108. } vorbis_residue;

  109. 

  110. typedef struct {

  111.     uint_fast8_t submaps;

  112.     uint_fast16_t coupling_steps;

  113.     uint_fast8_t *magnitude;

  114.     uint_fast8_t *angle;

  115.     uint_fast8_t *mux;

  116.     uint_fast8_t submap_floor[16];

  117.     uint_fast8_t submap_residue[16];

  118. } vorbis_mapping;

  119. 

  120. typedef struct {

  121.     uint_fast8_t blockflag;

  122.     uint_fast16_t windowtype;

  123.     uint_fast16_t transformtype;

  124.     uint_fast8_t mapping;

  125. } vorbis_mode;

  126. 

  127. typedef struct vorbis_context_s {

  128.     AVCodecContext *avccontext;

  129.     GetBitContext gb;

  130.     DSPContext dsp;

  131. 

  132.     MDCTContext mdct[2];

  133.     uint_fast8_t first_frame;

  134.     uint_fast32_t version;

  135.     uint_fast8_t audio_channels;

  136.     uint_fast32_t audio_samplerate;

  137.     uint_fast32_t bitrate_maximum;

  138.     uint_fast32_t bitrate_nominal;

  139.     uint_fast32_t bitrate_minimum;

  140.     uint_fast32_t blocksize[2];

  141.     const float * win[2];

  142.     uint_fast16_t codebook_count;

  143.     vorbis_codebook *codebooks;

  144.     uint_fast8_t floor_count;

  145.     vorbis_floor *floors;

  146.     uint_fast8_t residue_count;

  147.     vorbis_residue *residues;

  148.     uint_fast8_t mapping_count;

  149.     vorbis_mapping *mappings;

  150.     uint_fast8_t mode_count;

  151.     vorbis_mode *modes;

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

  153.     uint_fast8_t previous_window;

  154.     float *channel_residues;

  155.     float *channel_floors;

  156.     float *saved;

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

  158.     uint_fast32_t exp_bias;

  159. } vorbis_context;

  160. 

  161. /* Helper functions */

  162. 

  163. #define BARK(x) \

  164.     (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))

  165. 

  166. static float vorbisfloat2float(uint_fast32_t val) {

  167.     double mant=val&0x1fffff;

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

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

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

  171. }

  172. 

  173. 

  174. // Free all allocated memory -----------------------------------------

  175. 

  176. static void vorbis_free(vorbis_context *vc) {

  177.     int_fast16_t i;

  178. 

  179.     av_freep(&vc->channel_residues);

  180.     av_freep(&vc->channel_floors);

  181.     av_freep(&vc->saved);

  182. 

  183.     av_freep(&vc->residues);

  184.     av_freep(&vc->modes);

  185. 

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

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

  188. 

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

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

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

  192.     }

  193.     av_freep(&vc->codebooks);

  194. 

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

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

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

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

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

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

  201.         }

  202.         else {

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

  204.         }

  205.     }

  206.     av_freep(&vc->floors);

  207. 

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

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

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

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

  212.     }

  213.     av_freep(&vc->mappings);

  214. 

  215.     if(vc->exp_bias){

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

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

  218.     }

  219. }

  220. 

  221. // Parse setup header -------------------------------------------------

  222. 

  223. // Process codebooks part

  224. 

  225. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {

  226.     uint_fast16_t cb;

  227.     uint8_t *tmp_vlc_bits;

  228.     uint32_t *tmp_vlc_codes;

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

  230. 

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

  232. 

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

  234. 

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

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

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

  238. 

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

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

  241.         uint_fast8_t ordered;

  242.         uint_fast32_t t, used_entries=0;

  243.         uint_fast32_t entries;

  244. 

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

  246. 

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

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

  249.             goto error;

  250.         }

  251. 

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

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

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

  255.             goto error;

  256.         }

  257.         entries=get_bits(gb, 24);

  258.         if (entries>V_MAX_VLCS) {

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

  260.             goto error;

  261.         }

  262. 

  263.         ordered=get_bits1(gb);

  264. 

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

  266. 

  267.         if (!ordered) {

  268.             uint_fast16_t ce;

  269.             uint_fast8_t flag;

  270.             uint_fast8_t sparse=get_bits1(gb);

  271. 

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

  273. 

  274.             if (sparse) {

  275.                 AV_DEBUG(" sparse \n");

  276. 

  277.                 used_entries=0;

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

  279.                     flag=get_bits1(gb);

  280.                     if (flag) {

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

  282.                         ++used_entries;

  283.                     }

  284.                     else tmp_vlc_bits[ce]=0;

  285.                 }

  286.             } else {

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

  288. 

  289.                 used_entries=entries;

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

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

  292.                 }

  293.             }

  294.         } else {

  295.             uint_fast16_t current_entry=0;

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

  297. 

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

  299. 

  300.             used_entries=entries;

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

  302.                 uint_fast16_t i, number;

  303. 

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

  305. 

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

  307. 

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

  309. 

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

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

  312.                 }

  313. 

  314.                 current_entry+=number;

  315.             }

  316.             if (current_entry>used_entries) {

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

  318.                 goto error;

  319.             }

  320.         }

  321. 

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

  323. 

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

  325. 

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

  327. 

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

  329.             uint_fast16_t i, j, k;

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

  331.             uint_fast16_t codebook_multiplicands[codebook_lookup_values];

  332. 

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

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

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

  336.             uint_fast8_t codebook_sequence_p=get_bits1(gb);

  337. 

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

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

  340. 

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

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

  343. 

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

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

  346.             }

  347. 

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

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

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

  351.                 uint_fast8_t dim=codebook_setup->dimensions;

  352. 

  353.                 if (tmp_vlc_bits[i]) {

  354.                     float last=0.0;

  355.                     uint_fast32_t lookup_offset=i;

  356. 

  357. #ifdef V_DEBUG

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

  359. #endif

  360. 

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

  362.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  364.                         if (codebook_sequence_p) {

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

  366.                         }

  367.                         lookup_offset/=codebook_lookup_values;

  368.                     }

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

  370. 

  371. #ifdef V_DEBUG

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

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

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

  375.                     }

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

  377. #endif

  378. 

  379.                     ++j;

  380.                 }

  381.             }

  382.             if (j!=used_entries) {

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

  384.                 goto error;

  385.             }

  386.             entries=used_entries;

  387.         }

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

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

  390.             goto error;

  391.         }

  392. 

  393. // Initialize VLC table

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

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

  396.             goto error;

  397.         }

  398.         codebook_setup->maxdepth=0;

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

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

  401. 

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

  403.         else                                       codebook_setup->nb_bits=V_NB_BITS;

  404. 

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

  406. 

  407.         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)) {

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

  409.             goto error;

  410.         }

  411.     }

  412. 

  413.     av_free(tmp_vlc_bits);

  414.     av_free(tmp_vlc_codes);

  415.     return 0;

  416. 

  417. // Error:

  418. error:

  419.     av_free(tmp_vlc_bits);

  420.     av_free(tmp_vlc_codes);

  421.     return 1;

  422. }

  423. 

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

  425. 

  426. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {

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

  428.     uint_fast8_t i;

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

  430. 

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

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

  433. 

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

  435. 

  436.         if (vorbis_tdtransform) {

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

  438.             return 1;

  439.         }

  440.     }

  441.     return 0;

  442. }

  443. 

  444. // Process floors part

  445. 

  446. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  447.                                          vorbis_floor_data *vfu, float *vec);

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

  449. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  450.                                          vorbis_floor_data *vfu, float *vec);

  451. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {

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

  453.     uint_fast16_t i,j,k;

  454. 

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

  456. 

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

  458. 

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

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

  461. 

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

  463. 

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

  465. 

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

  467.             uint_fast8_t maximum_class=0;

  468.             uint_fast8_t rangebits;

  469.             uint_fast16_t floor1_values=2;

  470. 

  471.             floor_setup->decode=vorbis_floor1_decode;

  472. 

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

  474. 

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

  476. 

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

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

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

  480. 

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

  482. 

  483.             }

  484. 

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

  486. 

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

  488. 

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

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

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

  492. 

  493.                 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]);

  494. 

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

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

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

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

  499.                         return 1;

  500.                     }

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

  502. 

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

  504.                 }

  505. 

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

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

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

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

  510.                         return 1;

  511.                     }

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

  513. 

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

  515.                 }

  516.             }

  517. 

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

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

  520. 

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

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

  523.             }

  524. 

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

  526. 

  527. 

  528.             rangebits=get_bits(gb, 4);

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

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

  531. 

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

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

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

  535. 

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

  537.                 }

  538.             }

  539. 

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

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

  542.         }

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

  544.             uint_fast8_t max_codebook_dim=0;

  545. 

  546.             floor_setup->decode=vorbis_floor0_decode;

  547. 

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

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

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

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

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

  553.              * 2^0 - 1 == 0                             */

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

  555.               av_log(vc->avccontext, AV_LOG_ERROR,

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

  557.               return 1;

  558.             }

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

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

  561. 

  562.             /* allocate mem for booklist */

  563.             floor_setup->data.t0.book_list=

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

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

  566.             /* read book indexes */

  567.             {

  568.                 int idx;

  569.                 uint_fast8_t book_idx;

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

  571.                     book_idx=get_bits(gb, 8);

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

  573.                         return 1;

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

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

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

  577.                 }

  578.             }

  579. 

  580.             create_map( vc, i );

  581. 

  582.             /* allocate mem for lsp coefficients */

  583.             {

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

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

  586.                 floor_setup->data.t0.lsp=

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

  588.                               * sizeof(float));

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

  590.             }

  591. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  605.             {

  606.               int idx;

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

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

  609.                   idx+1,

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

  611.               }

  612.             }

  613. #endif

  614.         }

  615.         else {

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

  617.             return 1;

  618.         }

  619.     }

  620.     return 0;

  621. }

  622. 

  623. // Process residues part

  624. 

  625. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){

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

  627.     uint_fast8_t i, j, k;

  628. 

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

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

  631. 

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

  633. 

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

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

  636.         uint_fast8_t cascade[64];

  637.         uint_fast8_t high_bits;

  638.         uint_fast8_t low_bits;

  639. 

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

  641. 

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

  643. 

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

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

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

  647.         /* Validations to prevent a buffer overflow later. */

  648.         if (res_setup->begin>res_setup->end

  649.         || res_setup->end>vc->blocksize[1]/(res_setup->type==2?1:2)

  650.         || (res_setup->end-res_setup->begin)/res_setup->partition_size>V_MAX_PARTITIONS) {

  651.             av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %d, %d, %d, %d, %d\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1]/2);

  652.             return 1;

  653.         }

  654. 

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

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

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

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

  659.             return 1;

  660.         }

  661. 

  662.         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,

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

  664. 

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

  666.             high_bits=0;

  667.             low_bits=get_bits(gb, 3);

  668.             if (get_bits1(gb)) {

  669.                 high_bits=get_bits(gb, 5);

  670.             }

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

  672. 

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

  674.         }

  675. 

  676.         res_setup->maxpass=0;

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

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

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

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

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

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

  683.                         return 1;

  684.                     }

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

  686. 

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

  688. 

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

  690.                         res_setup->maxpass=k;

  691.                     }

  692.                 } else {

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

  694.                 }

  695.             }

  696.         }

  697.     }

  698.     return 0;

  699. }

  700. 

  701. // Process mappings part

  702. 

  703. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {

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

  705.     uint_fast8_t i, j;

  706. 

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

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

  709. 

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

  711. 

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

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

  714. 

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

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

  717.             return 1;

  718.         }

  719.         if (get_bits1(gb)) {

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

  721.         } else {

  722.             mapping_setup->submaps=1;

  723.         }

  724. 

  725.         if (get_bits1(gb)) {

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

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

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

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

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

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

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

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

  734.                     return 1;

  735.                 }

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

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

  738.                     return 1;

  739.                 }

  740.             }

  741.         } else {

  742.             mapping_setup->coupling_steps=0;

  743.         }

  744. 

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

  746. 

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

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

  749.             return 1; // following spec.

  750.         }

  751. 

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

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

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

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

  756.             }

  757.         }

  758. 

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

  760.             int bits;

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

  762.             bits=get_bits(gb, 8);

  763.             if (bits>=vc->floor_count) {

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

  765.                 return -1;

  766.             }

  767.             mapping_setup->submap_floor[j]=bits;

  768.             bits=get_bits(gb, 8);

  769.             if (bits>=vc->residue_count) {

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

  771.                 return -1;

  772.             }

  773.             mapping_setup->submap_residue[j]=bits;

  774. 

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

  776.         }

  777.     }

  778.     return 0;

  779. }

  780. 

  781. // Process modes part

  782. 

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

  784. {

  785.     vorbis_floor * floors=vc->floors;

  786.     vorbis_floor0 * vf;

  787.     int idx;

  788.     int_fast8_t blockflag;

  789.     int_fast32_t * map;

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

  791. 

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

  793.     {

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

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

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

  797. 

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

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

  800. 

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

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

  803.                               ((vf->bark_map_size)/

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

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

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

  807.         }

  808.     }

  809.     map[n]=-1;

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

  811.     }

  812. 

  813. #   ifdef V_DEBUG

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

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

  816.                  idx, map[idx]);

  817.     }

  818. #   endif

  819. }

  820. 

  821. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {

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

  823.     uint_fast8_t i;

  824. 

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

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

  827. 

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

  829. 

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

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

  832. 

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

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

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

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

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

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

  839.             return 1;

  840.         }

  841. 

  842.         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);

  843.     }

  844.     return 0;

  845. }

  846. 

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

  848. 

  849. static int vorbis_parse_setup_hdr(vorbis_context *vc) {

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

  851. 

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

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

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

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

  856.         return 1;

  857.     }

  858. 

  859.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  861.         return 2;

  862.     }

  863.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  865.         return 3;

  866.     }

  867.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  869.         return 4;

  870.     }

  871.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  873.         return 5;

  874.     }

  875.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  877.         return 6;

  878.     }

  879.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  881.         return 7;

  882.     }

  883.     if (!get_bits1(gb)) {

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

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

  886.     }

  887. 

  888.     return 0;

  889. }

  890. 

  891. // Process the identification header

  892. 

  893. static int vorbis_parse_id_hdr(vorbis_context *vc){

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

  895.     uint_fast8_t bl0, bl1;

  896. 

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

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

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

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

  901.         return 1;

  902.     }

  903. 

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

  905.     vc->audio_channels=get_bits(gb, 8);

  906.     if(vc->audio_channels <= 0){

  907.         av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");

  908.         return -1;

  909.     }

  910.     vc->audio_samplerate=get_bits_long(gb, 32);

  911.     if(vc->audio_samplerate <= 0){

  912.         av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");

  913.         return -1;

  914.     }

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

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

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

  918.     bl0=get_bits(gb, 4);

  919.     bl1=get_bits(gb, 4);

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

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

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

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

  924.         return 3;

  925.     }

  926.     // output format int16

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

  928.                                              AVCODEC_MAX_AUDIO_FRAME_SIZE) {

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

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

  931.         return 4;

  932.     }

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

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

  935. 

  936.     if(vc->exp_bias){

  937.         int i, j;

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

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

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

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

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

  943.         }

  944.     }

  945. 

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

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

  948.         return 2;

  949.     }

  950. 

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

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

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

  954.     vc->previous_window=0;

  955. 

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

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

  958. 

  959.     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 ",

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

  961. 

  962. /*

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

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

  965.         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)));

  966.     }

  967. */

  968. 

  969.     return 0;

  970. }

  971. 

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

  973. 

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

  975.     vorbis_context *vc = avccontext->priv_data ;

  976.     uint8_t *headers = avccontext->extradata;

  977.     int headers_len=avccontext->extradata_size;

  978.     uint8_t *header_start[3];

  979.     int header_len[3];

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

  981.     int hdr_type;

  982. 

  983.     vc->avccontext = avccontext;

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

  985. 

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

  987.         vc->add_bias = 385;

  988.         vc->exp_bias = 0;

  989.     } else {

  990.         vc->add_bias = 0;

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

  992.     }

  993. 

  994.     if (!headers_len) {

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

  996.         return -1;

  997.     }

  998. 

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

  1000.         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");

  1001.         return -1;

  1002.     }

  1003. 

  1004.     init_get_bits(gb, header_start[0], header_len[0]*8);

  1005.     hdr_type=get_bits(gb, 8);

  1006.     if (hdr_type!=1) {

  1007.         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");

  1008.         return -1;

  1009.     }

  1010.     if (vorbis_parse_id_hdr(vc)) {

  1011.         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");

  1012.         vorbis_free(vc);

  1013.         return -1;

  1014.     }

  1015. 

  1016.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1017.     hdr_type=get_bits(gb, 8);

  1018.     if (hdr_type!=5) {

  1019.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1020.         vorbis_free(vc);

  1021.         return -1;

  1022.     }

  1023.     if (vorbis_parse_setup_hdr(vc)) {

  1024.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1025.         vorbis_free(vc);

  1026.         return -1;

  1027.     }

  1028. 

  1029.     avccontext->channels = vc->audio_channels;

  1030.     avccontext->sample_rate = vc->audio_samplerate;

  1031.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1])>>2;

  1032.     avccontext->sample_fmt = SAMPLE_FMT_S16;

  1033. 

  1034.     return 0 ;

  1035. }

  1036. 

  1037. // Decode audiopackets -------------------------------------------------

  1038. 

  1039. // Read and decode floor

  1040. 

  1041. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  1042.                                          vorbis_floor_data *vfu, float *vec) {

  1043.     vorbis_floor0 * vf=&vfu->t0;

  1044.     float * lsp=vf->lsp;

  1045.     uint_fast32_t amplitude;

  1046.     uint_fast32_t book_idx;

  1047.     uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;

  1048. 

  1049.     amplitude=get_bits(&vc->gb, vf->amplitude_bits);

  1050.     if (amplitude>0) {

  1051.         float last = 0;

  1052.         uint_fast16_t lsp_len = 0;

  1053.         uint_fast16_t idx;

  1054.         vorbis_codebook codebook;

  1055. 

  1056.         book_idx=get_bits(&vc->gb, ilog(vf->num_books));

  1057.         if ( book_idx >= vf->num_books ) {

  1058.             av_log( vc->avccontext, AV_LOG_ERROR,

  1059.                     "floor0 dec: booknumber too high!\n" );

  1060.             book_idx= 0;

  1061.             //FIXME: look above

  1062.         }

  1063.         AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );

  1064.         codebook=vc->codebooks[vf->book_list[book_idx]];

  1065. 

  1066.         while (lsp_len<vf->order) {

  1067.             int vec_off;

  1068. 

  1069.             AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );

  1070.             AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );

  1071.             /* read temp vector */

  1072.             vec_off=get_vlc2(&vc->gb,

  1073.                              codebook.vlc.table,

  1074.                              codebook.nb_bits,

  1075.                              codebook.maxdepth ) *

  1076.                              codebook.dimensions;

  1077.             AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );

  1078.             /* copy each vector component and add last to it */

  1079.             for (idx=0; idx<codebook.dimensions; ++idx) {

  1080.                 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;

  1081.             }

  1082.             last=lsp[lsp_len+idx-1]; /* set last to last vector component */

  1083. 

  1084.             lsp_len += codebook.dimensions;

  1085.         }

  1086. #ifdef V_DEBUG

  1087.         /* DEBUG: output lsp coeffs */

  1088.         {

  1089.             int idx;

  1090.             for ( idx = 0; idx < lsp_len; ++idx )

  1091.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );

  1092.         }

  1093. #endif

  1094. 

  1095.         /* synthesize floor output vector */

  1096.         {

  1097.             int i;

  1098.             int order=vf->order;

  1099.             float wstep=M_PI/vf->bark_map_size;

  1100. 

  1101.             for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }

  1102. 

  1103.             AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",

  1104.                      vf->map_size, order, wstep);

  1105. 

  1106.             i=0;

  1107.             while(i<vf->map_size[blockflag]) {

  1108.                 int j, iter_cond=vf->map[blockflag][i];

  1109.                 float p=0.5f;

  1110.                 float q=0.5f;

  1111.                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times

  1112. 

  1113.                 /* similar part for the q and p products */

  1114.                 for(j=0;j<order;j+=2) {

  1115.                     q *= lsp[j]  -two_cos_w;

  1116.                     p *= lsp[j+1]-two_cos_w;

  1117.                 }

  1118.                 if(j==order) { // even order

  1119.                     p *= p*(2.0f-two_cos_w);

  1120.                     q *= q*(2.0f+two_cos_w);

  1121.                 }

  1122.                 else { // odd order

  1123.                     q *= two_cos_w-lsp[j]; // one more time for q

  1124. 

  1125.                     /* final step and square */

  1126.                     p *= p*(4.f-two_cos_w*two_cos_w);

  1127.                     q *= q;

  1128.                 }

  1129. 

  1130.                 /* calculate linear floor value */

  1131.                 {

  1132.                     q=exp( (

  1133.                              ( (amplitude*vf->amplitude_offset)/

  1134.                                (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )

  1135.                              - vf->amplitude_offset ) * .11512925f

  1136.                          );

  1137.                 }

  1138. 

  1139.                 /* fill vector */

  1140.                 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);

  1141.             }

  1142.         }

  1143.     }

  1144.     else {

  1145.         /* this channel is unused */

  1146.         return 1;

  1147.     }

  1148. 

  1149.     AV_DEBUG(" Floor0 decoded\n");

  1150. 

  1151.     return 0;

  1152. }

  1153. 

  1154. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {

  1155.     vorbis_floor1 * vf=&vfu->t1;

  1156.     GetBitContext *gb=&vc->gb;

  1157.     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };

  1158.     uint_fast16_t range=range_v[vf->multiplier-1];

  1159.     uint_fast16_t floor1_Y[vf->x_list_dim];

  1160.     uint_fast16_t floor1_Y_final[vf->x_list_dim];

  1161.     int floor1_flag[vf->x_list_dim];

  1162.     uint_fast8_t class_;

  1163.     uint_fast8_t cdim;

  1164.     uint_fast8_t cbits;

  1165.     uint_fast8_t csub;

  1166.     uint_fast8_t cval;

  1167.     int_fast16_t book;

  1168.     uint_fast16_t offset;

  1169.     uint_fast16_t i,j;

  1170.     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?

  1171.     int_fast16_t dy, err;

  1172. 

  1173. 

  1174.     if (!get_bits1(gb)) return 1; // silence

  1175. 

  1176. // Read values (or differences) for the floor's points

  1177. 

  1178.     floor1_Y[0]=get_bits(gb, ilog(range-1));

  1179.     floor1_Y[1]=get_bits(gb, ilog(range-1));

  1180. 

  1181.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1182. 

  1183.     offset=2;

  1184.     for(i=0;i<vf->partitions;++i) {

  1185.         class_=vf->partition_class[i];

  1186.         cdim=vf->class_dimensions[class_];

  1187.         cbits=vf->class_subclasses[class_];

  1188.         csub=(1<<cbits)-1;

  1189.         cval=0;

  1190. 

  1191.         AV_DEBUG("Cbits %d \n", cbits);

  1192. 

  1193.         if (cbits) { // this reads all subclasses for this partition's class

  1194.             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,

  1195.             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);

  1196.         }

  1197. 

  1198.         for(j=0;j<cdim;++j) {

  1199.             book=vf->subclass_books[class_][cval & csub];

  1200. 

  1201.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1202. 

  1203.             cval=cval>>cbits;

  1204.             if (book>-1) {

  1205.                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,

  1206.                 vc->codebooks[book].nb_bits, 3);

  1207.             } else {

  1208.                 floor1_Y[offset+j]=0;

  1209.             }

  1210. 

  1211.             AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);

  1212.         }

  1213.         offset+=cdim;

  1214.     }

  1215. 

  1216. // Amplitude calculation from the differences

  1217. 

  1218.     floor1_flag[0]=1;

  1219.     floor1_flag[1]=1;

  1220.     floor1_Y_final[0]=floor1_Y[0];

  1221.     floor1_Y_final[1]=floor1_Y[1];

  1222. 

  1223.     for(i=2;i<vf->x_list_dim;++i) {

  1224.         uint_fast16_t val, highroom, lowroom, room;

  1225.         uint_fast16_t high_neigh_offs;

  1226.         uint_fast16_t low_neigh_offs;

  1227. 

  1228.         low_neigh_offs=vf->list[i].low;

  1229.         high_neigh_offs=vf->list[i].high;

  1230.         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin

  1231.         adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;

  1232.         ady= FFABS(dy);

  1233.         err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);

  1234.         off=(int16_t)err/(int16_t)adx;

  1235.         if (dy<0) {

  1236.             predicted=floor1_Y_final[low_neigh_offs]-off;

  1237.         } else {

  1238.             predicted=floor1_Y_final[low_neigh_offs]+off;

  1239.         } // render_point end

  1240. 

  1241.         val=floor1_Y[i];

  1242.         highroom=range-predicted;

  1243.         lowroom=predicted;

  1244.         if (highroom < lowroom) {

  1245.             room=highroom*2;

  1246.         } else {

  1247.             room=lowroom*2;   // SPEC mispelling

  1248.         }

  1249.         if (val) {

  1250.             floor1_flag[low_neigh_offs]=1;

  1251.             floor1_flag[high_neigh_offs]=1;

  1252.             floor1_flag[i]=1;

  1253.             if (val>=room) {

  1254.                 if (highroom > lowroom) {

  1255.                     floor1_Y_final[i]=val-lowroom+predicted;

  1256.                 } else {

  1257.                     floor1_Y_final[i]=predicted-val+highroom-1;

  1258.                 }

  1259.             } else {

  1260.                 if (val & 1) {

  1261.                     floor1_Y_final[i]=predicted-(val+1)/2;

  1262.                 } else {

  1263.                     floor1_Y_final[i]=predicted+val/2;

  1264.                 }

  1265.             }

  1266.         } else {

  1267.             floor1_flag[i]=0;

  1268.             floor1_Y_final[i]=predicted;

  1269.         }

  1270. 

  1271.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);

  1272.     }

  1273. 

  1274. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1275. 

  1276.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1277. 

  1278.     AV_DEBUG(" Floor decoded\n");

  1279. 

  1280.     return 0;

  1281. }

  1282. 

  1283. // Read and decode residue

  1284. 

  1285. 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) {

  1286.     GetBitContext *gb=&vc->gb;

  1287.     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;

  1288.     uint_fast16_t n_to_read=vr->end-vr->begin;

  1289.     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;

  1290.     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];

  1291.     uint_fast8_t pass;

  1292.     uint_fast8_t ch_used;

  1293.     uint_fast8_t i,j,l;

  1294.     uint_fast16_t k;

  1295. 

  1296.     if (vr_type==2) {

  1297.         for(j=1;j<ch;++j) {

  1298.                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input

  1299.         }

  1300.         if (do_not_decode[0]) return 0;

  1301.         ch_used=1;

  1302.     } else {

  1303.         ch_used=ch;

  1304.     }

  1305. 

  1306.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1307. 

  1308.     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?

  1309.         uint_fast16_t voffset;

  1310.         uint_fast16_t partition_count;

  1311.         uint_fast16_t j_times_ptns_to_read;

  1312. 

  1313.         voffset=vr->begin;

  1314.         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error

  1315.             if (!pass) {

  1316.                 uint_fast32_t inverse_class = ff_inverse[vr->classifications];

  1317.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1318.                     if (!do_not_decode[j]) {

  1319.                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1320.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1321. 

  1322.                         AV_DEBUG("Classword: %d \n", temp);

  1323. 

  1324.                         assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]

  1325.                         for(i=0;i<c_p_c;++i) {

  1326.                             uint_fast32_t temp2;

  1327. 

  1328.                             temp2=(((uint_fast64_t)temp) * inverse_class)>>32;

  1329.                             if (partition_count+c_p_c-1-i < ptns_to_read) {

  1330.                                 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;

  1331.                             }

  1332.                             temp=temp2;

  1333.                         }

  1334.                     }

  1335.                     j_times_ptns_to_read+=ptns_to_read;

  1336.                 }

  1337.             }

  1338.             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {

  1339.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1340.                     uint_fast16_t voffs;

  1341. 

  1342.                     if (!do_not_decode[j]) {

  1343.                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];

  1344.                         int_fast16_t vqbook=vr->books[vqclass][pass];

  1345. 

  1346.                         if (vqbook>=0 && vc->codebooks[vqbook].codevectors) {

  1347.                             uint_fast16_t coffs;

  1348.                             unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64

  1349.                             uint_fast16_t step= dim==1 ? vr->partition_size

  1350.                                               : FASTDIV(vr->partition_size, dim);

  1351.                             vorbis_codebook codebook= vc->codebooks[vqbook];

  1352. 

  1353.                             if (vr_type==0) {

  1354. 

  1355.                                 voffs=voffset+j*vlen;

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

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

  1358.                                     for(l=0;l<dim;++l) {

  1359.                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH

  1360.                                     }

  1361.                                 }

  1362.                             }

  1363.                             else if (vr_type==1) {

  1364.                                 voffs=voffset+j*vlen;

  1365.                                 for(k=0;k<step;++k) {

  1366.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1367.                                     for(l=0;l<dim;++l, ++voffs) {

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

  1369. 

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

  1371.                                     }

  1372.                                 }

  1373.                             }

  1374.                             else if (vr_type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized

  1375.                                 voffs=voffset>>1;

  1376. 

  1377.                                 if(dim==2) {

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

  1379.                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1380.                                         vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH

  1381.                                         vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH

  1382.                                     }

  1383.                                 } else if(dim==4) {

  1384.                                     for(k=0;k<step;++k, voffs+=2) {

  1385.                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1386.                                         vec[voffs       ]+=codebook.codevectors[coffs  ];  // FPMATH

  1387.                                         vec[voffs+1     ]+=codebook.codevectors[coffs+2];  // FPMATH

  1388.                                         vec[voffs+vlen  ]+=codebook.codevectors[coffs+1];  // FPMATH

  1389.                                         vec[voffs+vlen+1]+=codebook.codevectors[coffs+3];  // FPMATH

  1390.                                     }

  1391.                                 } else

  1392.                                 for(k=0;k<step;++k) {

  1393.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1394.                                     for(l=0;l<dim;l+=2, voffs++) {

  1395.                                         vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH

  1396.                                         vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH

  1397. 

  1398.                                         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);

  1399.                                     }

  1400.                                 }

  1401. 

  1402.                             }

  1403.                             else if (vr_type==2) {

  1404.                                 voffs=voffset;

  1405. 

  1406.                                 for(k=0;k<step;++k) {

  1407.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1408.                                     for(l=0;l<dim;++l, ++voffs) {

  1409.                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %

  1410. 

  1411.                                         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);

  1412.                                     }

  1413.                                 }

  1414.                             }

  1415.                         }

  1416.                     }

  1417.                     j_times_ptns_to_read+=ptns_to_read;

  1418.                 }

  1419.                 ++partition_count;

  1420.                 voffset+=vr->partition_size;

  1421.             }

  1422.         }

  1423.     }

  1424.     return 0;

  1425. }

  1426. 

  1427. 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)

  1428. {

  1429.     if (vr->type==2)

  1430.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1431.     else if (vr->type==1)

  1432.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1433.     else if (vr->type==0)

  1434.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1435.     else {

  1436.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1437.         return 1;

  1438.     }

  1439. }

  1440. 

  1441. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1442. {

  1443.     int i;

  1444.     for(i=0; i<blocksize; i++)

  1445.     {

  1446.         if (mag[i]>0.0) {

  1447.             if (ang[i]>0.0) {

  1448.                 ang[i]=mag[i]-ang[i];

  1449.             } else {

  1450.                 float temp=ang[i];

  1451.                 ang[i]=mag[i];

  1452.                 mag[i]+=temp;

  1453.             }

  1454.         } else {

  1455.             if (ang[i]>0.0) {

  1456.                 ang[i]+=mag[i];

  1457.             } else {

  1458.                 float temp=ang[i];

  1459.                 ang[i]=mag[i];

  1460.                 mag[i]-=temp;

  1461.             }

  1462.         }

  1463.     }

  1464. }

  1465. 

  1466. static void copy_normalize(float *dst, float *src, int len, int exp_bias, float add_bias)

  1467. {

  1468.     int i;

  1469.     if(exp_bias) {

  1470.         for(i=0; i<len; i++)

  1471.             ((uint32_t*)dst)[i] = ((uint32_t*)src)[i] + exp_bias; // dst[k]=src[i]*(1<<bias)

  1472.     } else {

  1473.         for(i=0; i<len; i++)

  1474.             dst[i] = src[i] + add_bias;

  1475.     }

  1476. }

  1477. 

  1478. // Decode the audio packet using the functions above

  1479. 

  1480. static int vorbis_parse_audio_packet(vorbis_context *vc) {

  1481.     GetBitContext *gb=&vc->gb;

  1482. 

  1483.     uint_fast8_t previous_window=vc->previous_window;

  1484.     uint_fast8_t mode_number;

  1485.     uint_fast8_t blockflag;

  1486.     uint_fast16_t blocksize;

  1487.     int_fast32_t i,j;

  1488.     uint_fast8_t no_residue[vc->audio_channels];

  1489.     uint_fast8_t do_not_decode[vc->audio_channels];

  1490.     vorbis_mapping *mapping;

  1491.     float *ch_res_ptr=vc->channel_residues;

  1492.     float *ch_floor_ptr=vc->channel_floors;

  1493.     uint_fast8_t res_chan[vc->audio_channels];

  1494.     uint_fast8_t res_num=0;

  1495.     int_fast16_t retlen=0;

  1496.     float fadd_bias = vc->add_bias;

  1497. 

  1498.     if (get_bits1(gb)) {

  1499.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1500.         return -1; // packet type not audio

  1501.     }

  1502. 

  1503.     if (vc->mode_count==1) {

  1504.         mode_number=0;

  1505.     } else {

  1506.         mode_number=get_bits(gb, ilog(vc->mode_count-1));

  1507.     }

  1508.     if (mode_number>=vc->mode_count) {

  1509.         av_log(vc->avccontext, AV_LOG_ERROR, "mode number %d out of range.\n", mode_number);

  1510.         return -1;

  1511.     }

  1512.     vc->mode_number=mode_number;

  1513.     mapping=&vc->mappings[vc->modes[mode_number].mapping];

  1514. 

  1515.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1516. 

  1517.     blockflag=vc->modes[mode_number].blockflag;

  1518.     blocksize=vc->blocksize[blockflag];

  1519.     if (blockflag) {

  1520.         skip_bits(gb, 2); // previous_window, next_window

  1521.     }

  1522. 

  1523.     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1524.     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1525. 

  1526. // Decode floor

  1527. 

  1528.     for(i=0;i<vc->audio_channels;++i) {

  1529.         vorbis_floor *floor;

  1530.         if (mapping->submaps>1) {

  1531.             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1532.         } else {

  1533.             floor=&vc->floors[mapping->submap_floor[0]];

  1534.         }

  1535. 

  1536.         no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);

  1537.         ch_floor_ptr+=blocksize/2;

  1538.     }

  1539. 

  1540. // Nonzero vector propagate

  1541. 

  1542.     for(i=mapping->coupling_steps-1;i>=0;--i) {

  1543.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1544.             no_residue[mapping->magnitude[i]]=0;

  1545.             no_residue[mapping->angle[i]]=0;

  1546.         }

  1547.     }

  1548. 

  1549. // Decode residue

  1550. 

  1551.     for(i=0;i<mapping->submaps;++i) {

  1552.         vorbis_residue *residue;

  1553.         uint_fast8_t ch=0;

  1554. 

  1555.         for(j=0;j<vc->audio_channels;++j) {

  1556.             if ((mapping->submaps==1) || (i==mapping->mux[j])) {

  1557.                 res_chan[j]=res_num;

  1558.                 if (no_residue[j]) {

  1559.                     do_not_decode[ch]=1;

  1560.                 } else {

  1561.                     do_not_decode[ch]=0;

  1562.                 }

  1563.                 ++ch;

  1564.                 ++res_num;

  1565.             }

  1566.         }

  1567.         residue=&vc->residues[mapping->submap_residue[i]];

  1568.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1569. 

  1570.         ch_res_ptr+=ch*blocksize/2;

  1571.     }

  1572. 

  1573. // Inverse coupling

  1574. 

  1575.     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed

  1576.         float *mag, *ang;

  1577. 

  1578.         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;

  1579.         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;

  1580.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);

  1581.     }

  1582. 

  1583. // Dotproduct, MDCT

  1584. 

  1585.     for(j=vc->audio_channels-1;j>=0;j--) {

  1586.         ch_floor_ptr=vc->channel_floors+j*blocksize/2;

  1587.         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;

  1588.         vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);

  1589.         ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);

  1590.     }

  1591. 

  1592. // Overlap/add, save data for next overlapping  FPMATH

  1593. 

  1594.     retlen = (blocksize + vc->blocksize[previous_window])/4;

  1595.     for(j=0;j<vc->audio_channels;j++) {

  1596.         uint_fast16_t bs0=vc->blocksize[0];

  1597.         uint_fast16_t bs1=vc->blocksize[1];

  1598.         float *residue=vc->channel_residues+res_chan[j]*blocksize/2;

  1599.         float *saved=vc->saved+j*bs1/4;

  1600.         float *ret=vc->channel_floors+j*retlen;

  1601.         float *buf=residue;

  1602.         const float *win=vc->win[blockflag&previous_window];

  1603. 

  1604.         if(blockflag == previous_window) {

  1605.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize/4);

  1606.         } else if(blockflag > previous_window) {

  1607.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0/4);

  1608.             copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);

  1609.         } else {

  1610.             copy_normalize(ret, saved, (bs1-bs0)/4, vc->exp_bias, fadd_bias);

  1611.             vc->dsp.vector_fmul_window(ret+(bs1-bs0)/4, saved+(bs1-bs0)/4, buf, win, fadd_bias, bs0/4);

  1612.         }

  1613.         memcpy(saved, buf+blocksize/4, blocksize/4*sizeof(float));

  1614.     }

  1615. 

  1616.     vc->previous_window = blockflag;

  1617.     return retlen;

  1618. }

  1619. 

  1620. // Return the decoded audio packet through the standard api

  1621. 

  1622. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1623.                         void *data, int *data_size,

  1624.                         const uint8_t *buf, int buf_size)

  1625. {

  1626.     vorbis_context *vc = avccontext->priv_data ;

  1627.     GetBitContext *gb = &(vc->gb);

  1628.     const float *channel_ptrs[vc->audio_channels];

  1629.     int i;

  1630. 

  1631.     int_fast16_t len;

  1632. 

  1633.     if(!buf_size){

  1634.         return 0;

  1635.     }

  1636. 

  1637.     AV_DEBUG("packet length %d \n", buf_size);

  1638. 

  1639.     init_get_bits(gb, buf, buf_size*8);

  1640. 

  1641.     len=vorbis_parse_audio_packet(vc);

  1642. 

  1643.     if (len<=0) {

  1644.         *data_size=0;

  1645.         return buf_size;

  1646.     }

  1647. 

  1648.     if (!vc->first_frame) {

  1649.         vc->first_frame=1;

  1650.         *data_size=0;

  1651.         return buf_size ;

  1652.     }

  1653. 

  1654.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1655. 

  1656.     for(i=0; i<vc->audio_channels; i++)

  1657.         channel_ptrs[i] = vc->channel_floors+i*len;

  1658.     vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);

  1659.     *data_size=len*2*vc->audio_channels;

  1660. 

  1661.     return buf_size ;

  1662. }

  1663. 

  1664. // Close decoder

  1665. 

  1666. static av_cold int vorbis_decode_close(AVCodecContext *avccontext) {

  1667.     vorbis_context *vc = avccontext->priv_data;

  1668. 

  1669.     vorbis_free(vc);

  1670. 

  1671.     return 0 ;

  1672. }

  1673. 

  1674. AVCodec vorbis_decoder = {

  1675.     "vorbis",

  1676.     CODEC_TYPE_AUDIO,

  1677.     CODEC_ID_VORBIS,

  1678.     sizeof(vorbis_context),

  1679.     vorbis_decode_init,

  1680.     NULL,

  1681.     vorbis_decode_close,

  1682.     vorbis_decode_frame,

  1683.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1684. };