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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 "get_bits.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. 

  215. // Parse setup header -------------------------------------------------

  216. 

  217. // Process codebooks part

  218. 

  219. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {

  220.     uint_fast16_t cb;

  221.     uint8_t *tmp_vlc_bits;

  222.     uint32_t *tmp_vlc_codes;

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

  224. 

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

  226. 

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

  228. 

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

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

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

  232. 

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

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

  235.         uint_fast8_t ordered;

  236.         uint_fast32_t t, used_entries=0;

  237.         uint_fast32_t entries;

  238. 

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

  240. 

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

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

  243.             goto error;

  244.         }

  245. 

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

  247.         if (codebook_setup->dimensions>16) {

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

  249.             goto error;

  250.         }

  251.         entries=get_bits(gb, 24);

  252.         if (entries>V_MAX_VLCS) {

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

  254.             goto error;

  255.         }

  256. 

  257.         ordered=get_bits1(gb);

  258. 

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

  260. 

  261.         if (!ordered) {

  262.             uint_fast16_t ce;

  263.             uint_fast8_t flag;

  264.             uint_fast8_t sparse=get_bits1(gb);

  265. 

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

  267. 

  268.             if (sparse) {

  269.                 AV_DEBUG(" sparse \n");

  270. 

  271.                 used_entries=0;

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

  273.                     flag=get_bits1(gb);

  274.                     if (flag) {

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

  276.                         ++used_entries;

  277.                     }

  278.                     else tmp_vlc_bits[ce]=0;

  279.                 }

  280.             } else {

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

  282. 

  283.                 used_entries=entries;

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

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

  286.                 }

  287.             }

  288.         } else {

  289.             uint_fast16_t current_entry=0;

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

  291. 

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

  293. 

  294.             used_entries=entries;

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

  296.                 uint_fast16_t i, number;

  297. 

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

  299. 

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

  301. 

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

  303. 

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

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

  306.                 }

  307. 

  308.                 current_entry+=number;

  309.             }

  310.             if (current_entry>used_entries) {

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

  312.                 goto error;

  313.             }

  314.         }

  315. 

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

  317. 

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

  319. 

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

  321. 

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

  323.             uint_fast16_t i, j, k;

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

  325.             uint_fast16_t codebook_multiplicands[codebook_lookup_values];

  326. 

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

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

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

  330.             uint_fast8_t codebook_sequence_p=get_bits1(gb);

  331. 

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

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

  334. 

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

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

  337. 

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

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

  340.             }

  341. 

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

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

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

  345.                 uint_fast8_t dim=codebook_setup->dimensions;

  346. 

  347.                 if (tmp_vlc_bits[i]) {

  348.                     float last=0.0;

  349.                     uint_fast32_t lookup_offset=i;

  350. 

  351. #ifdef V_DEBUG

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

  353. #endif

  354. 

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

  356.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  358.                         if (codebook_sequence_p) {

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

  360.                         }

  361.                         lookup_offset/=codebook_lookup_values;

  362.                     }

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

  364. 

  365. #ifdef V_DEBUG

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

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

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

  369.                     }

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

  371. #endif

  372. 

  373.                     ++j;

  374.                 }

  375.             }

  376.             if (j!=used_entries) {

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

  378.                 goto error;

  379.             }

  380.             entries=used_entries;

  381.         }

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

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

  384.             goto error;

  385.         }

  386. 

  387. // Initialize VLC table

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

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

  390.             goto error;

  391.         }

  392.         codebook_setup->maxdepth=0;

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

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

  395. 

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

  397.         else                                       codebook_setup->nb_bits=V_NB_BITS;

  398. 

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

  400. 

  401.         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)) {

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

  403.             goto error;

  404.         }

  405.     }

  406. 

  407.     av_free(tmp_vlc_bits);

  408.     av_free(tmp_vlc_codes);

  409.     return 0;

  410. 

  411. // Error:

  412. error:

  413.     av_free(tmp_vlc_bits);

  414.     av_free(tmp_vlc_codes);

  415.     return 1;

  416. }

  417. 

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

  419. 

  420. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {

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

  422.     uint_fast8_t i;

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

  424. 

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

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

  427. 

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

  429. 

  430.         if (vorbis_tdtransform) {

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

  432.             return 1;

  433.         }

  434.     }

  435.     return 0;

  436. }

  437. 

  438. // Process floors part

  439. 

  440. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  441.                                          vorbis_floor_data *vfu, float *vec);

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

  443. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  444.                                          vorbis_floor_data *vfu, float *vec);

  445. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {

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

  447.     uint_fast16_t i,j,k;

  448. 

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

  450. 

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

  452. 

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

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

  455. 

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

  457. 

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

  459. 

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

  461.             uint_fast8_t maximum_class=0;

  462.             uint_fast8_t rangebits;

  463.             uint_fast16_t floor1_values=2;

  464. 

  465.             floor_setup->decode=vorbis_floor1_decode;

  466. 

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

  468. 

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

  470. 

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

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

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

  474. 

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

  476. 

  477.             }

  478. 

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

  480. 

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

  482. 

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

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

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

  486. 

  487.                 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]);

  488. 

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

  490.                     floor_setup->data.t1.class_masterbook[j]=get_bits(gb, 8);

  491. 

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

  493.                 }

  494. 

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

  496.                     floor_setup->data.t1.subclass_books[j][k]=(int16_t)get_bits(gb, 8)-1;

  497. 

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

  499.                 }

  500.             }

  501. 

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

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

  504. 

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

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

  507.             }

  508. 

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

  510. 

  511. 

  512.             rangebits=get_bits(gb, 4);

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

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

  515. 

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

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

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

  519. 

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

  521.                 }

  522.             }

  523. 

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

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

  526.         }

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

  528.             uint_fast8_t max_codebook_dim=0;

  529. 

  530.             floor_setup->decode=vorbis_floor0_decode;

  531. 

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

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

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

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

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

  537.              * 2^0 - 1 == 0                             */

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

  539.               av_log(vc->avccontext, AV_LOG_ERROR,

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

  541.               return 1;

  542.             }

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

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

  545. 

  546.             /* allocate mem for booklist */

  547.             floor_setup->data.t0.book_list=

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

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

  550.             /* read book indexes */

  551.             {

  552.                 int idx;

  553.                 uint_fast8_t book_idx;

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

  555.                     book_idx=get_bits(gb, 8);

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

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

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

  559. 

  560.                     if (floor_setup->data.t0.book_list[idx]>vc->codebook_count)

  561.                         return 1;

  562.                 }

  563.             }

  564. 

  565.             create_map( vc, i );

  566. 

  567.             /* allocate mem for lsp coefficients */

  568.             {

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

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

  571.                 floor_setup->data.t0.lsp=

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

  573.                               * sizeof(float));

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

  575.             }

  576. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  590.             {

  591.               int idx;

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

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

  594.                   idx+1,

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

  596.               }

  597.             }

  598. #endif

  599.         }

  600.         else {

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

  602.             return 1;

  603.         }

  604.     }

  605.     return 0;

  606. }

  607. 

  608. // Process residues part

  609. 

  610. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){

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

  612.     uint_fast8_t i, j, k;

  613. 

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

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

  616. 

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

  618. 

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

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

  621.         uint_fast8_t cascade[64];

  622.         uint_fast8_t high_bits;

  623.         uint_fast8_t low_bits;

  624. 

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

  626. 

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

  628. 

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

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

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

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

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

  634. 

  635.         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,

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

  637. 

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

  639.             high_bits=0;

  640.             low_bits=get_bits(gb, 3);

  641.             if (get_bits1(gb)) {

  642.                 high_bits=get_bits(gb, 5);

  643.             }

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

  645. 

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

  647.         }

  648. 

  649.         res_setup->maxpass=0;

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

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

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

  653.                         res_setup->books[j][k]=get_bits(gb, 8);

  654. 

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

  656. 

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

  658.                         res_setup->maxpass=k;

  659.                     }

  660.                 } else {

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

  662.                 }

  663.             }

  664.         }

  665.     }

  666.     return 0;

  667. }

  668. 

  669. // Process mappings part

  670. 

  671. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {

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

  673.     uint_fast8_t i, j;

  674. 

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

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

  677. 

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

  679. 

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

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

  682. 

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

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

  685.             return 1;

  686.         }

  687.         if (get_bits1(gb)) {

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

  689.         } else {

  690.             mapping_setup->submaps=1;

  691.         }

  692. 

  693.         if (get_bits1(gb)) {

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

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

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

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

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

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

  700.                 // FIXME: sanity checks

  701.             }

  702.         } else {

  703.             mapping_setup->coupling_steps=0;

  704.         }

  705. 

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

  707. 

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

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

  710.             return 1; // following spec.

  711.         }

  712. 

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

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

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

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

  717.             }

  718.         }

  719. 

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

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

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

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

  724. 

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

  726.         }

  727.     }

  728.     return 0;

  729. }

  730. 

  731. // Process modes part

  732. 

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

  734. {

  735.     vorbis_floor * floors=vc->floors;

  736.     vorbis_floor0 * vf;

  737.     int idx;

  738.     int_fast8_t blockflag;

  739.     int_fast32_t * map;

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

  741. 

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

  743.     {

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

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

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

  747. 

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

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

  750. 

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

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

  753.                               ((vf->bark_map_size)/

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

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

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

  757.         }

  758.     }

  759.     map[n]=-1;

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

  761.     }

  762. 

  763. #   ifdef V_DEBUG

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

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

  766.                  idx, map[idx]);

  767.     }

  768. #   endif

  769. }

  770. 

  771. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {

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

  773.     uint_fast8_t i;

  774. 

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

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

  777. 

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

  779. 

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

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

  782. 

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

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

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

  786.         mode_setup->mapping=get_bits(gb, 8); //FIXME check

  787. 

  788.         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);

  789.     }

  790.     return 0;

  791. }

  792. 

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

  794. 

  795. static int vorbis_parse_setup_hdr(vorbis_context *vc) {

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

  797. 

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

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

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

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

  802.         return 1;

  803.     }

  804. 

  805.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  807.         return 2;

  808.     }

  809.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  811.         return 3;

  812.     }

  813.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  815.         return 4;

  816.     }

  817.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  819.         return 5;

  820.     }

  821.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  823.         return 6;

  824.     }

  825.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  827.         return 7;

  828.     }

  829.     if (!get_bits1(gb)) {

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

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

  832.     }

  833. 

  834.     return 0;

  835. }

  836. 

  837. // Process the identification header

  838. 

  839. static int vorbis_parse_id_hdr(vorbis_context *vc){

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

  841.     uint_fast8_t bl0, bl1;

  842. 

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

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

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

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

  847.         return 1;

  848.     }

  849. 

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

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

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

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

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

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

  856.     bl0=get_bits(gb, 4);

  857.     bl1=get_bits(gb, 4);

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

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

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

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

  862.         return 3;

  863.     }

  864.     // output format int16

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

  866.                                              AVCODEC_MAX_AUDIO_FRAME_SIZE) {

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

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

  869.         return 4;

  870.     }

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

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

  873. 

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

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

  876.         return 2;

  877.     }

  878. 

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

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

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

  882.     vc->previous_window=0;

  883. 

  884.     ff_mdct_init(&vc->mdct[0], bl0, 1, vc->exp_bias ? -(1<<15) : -1.0);

  885.     ff_mdct_init(&vc->mdct[1], bl1, 1, vc->exp_bias ? -(1<<15) : -1.0);

  886. 

  887.     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 ",

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

  889. 

  890. /*

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

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

  893.         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)));

  894.     }

  895. */

  896. 

  897.     return 0;

  898. }

  899. 

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

  901. 

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

  903.     vorbis_context *vc = avccontext->priv_data ;

  904.     uint8_t *headers = avccontext->extradata;

  905.     int headers_len=avccontext->extradata_size;

  906.     uint8_t *header_start[3];

  907.     int header_len[3];

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

  909.     int hdr_type;

  910. 

  911.     vc->avccontext = avccontext;

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

  913. 

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

  915.         vc->add_bias = 385;

  916.         vc->exp_bias = 0;

  917.     } else {

  918.         vc->add_bias = 0;

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

  920.     }

  921. 

  922.     if (!headers_len) {

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

  924.         return -1;

  925.     }

  926. 

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

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

  929.         return -1;

  930.     }

  931. 

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

  933.     hdr_type=get_bits(gb, 8);

  934.     if (hdr_type!=1) {

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

  936.         return -1;

  937.     }

  938.     if (vorbis_parse_id_hdr(vc)) {

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

  940.         vorbis_free(vc);

  941.         return -1;

  942.     }

  943. 

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

  945.     hdr_type=get_bits(gb, 8);

  946.     if (hdr_type!=5) {

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

  948.         vorbis_free(vc);

  949.         return -1;

  950.     }

  951.     if (vorbis_parse_setup_hdr(vc)) {

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

  953.         vorbis_free(vc);

  954.         return -1;

  955.     }

  956. 

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

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

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

  960.     avccontext->sample_fmt = SAMPLE_FMT_S16;

  961. 

  962.     return 0 ;

  963. }

  964. 

  965. // Decode audiopackets -------------------------------------------------

  966. 

  967. // Read and decode floor

  968. 

  969. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  970.                                          vorbis_floor_data *vfu, float *vec) {

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

  972.     float * lsp=vf->lsp;

  973.     uint_fast32_t amplitude;

  974.     uint_fast32_t book_idx;

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

  976. 

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

  978.     if (amplitude>0) {

  979.         float last = 0;

  980.         uint_fast16_t lsp_len = 0;

  981.         uint_fast16_t idx;

  982.         vorbis_codebook codebook;

  983. 

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

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

  986.             av_log( vc->avccontext, AV_LOG_ERROR,

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

  988.             book_idx= 0;

  989.             //FIXME: look above

  990.         }

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

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

  993. 

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

  995.             int vec_off;

  996. 

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

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

  999.             /* read temp vector */

  1000.             vec_off=get_vlc2(&vc->gb,

  1001.                              codebook.vlc.table,

  1002.                              codebook.nb_bits,

  1003.                              codebook.maxdepth ) *

  1004.                              codebook.dimensions;

  1005.             AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );

  1006.             /* copy each vector component and add last to it */

  1007.             for (idx=0; idx<codebook.dimensions; ++idx) {

  1008.                 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;

  1009.             }

  1010.             last=lsp[lsp_len+idx-1]; /* set last to last vector component */

  1011. 

  1012.             lsp_len += codebook.dimensions;

  1013.         }

  1014. #ifdef V_DEBUG

  1015.         /* DEBUG: output lsp coeffs */

  1016.         {

  1017.             int idx;

  1018.             for ( idx = 0; idx < lsp_len; ++idx )

  1019.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );

  1020.         }

  1021. #endif

  1022. 

  1023.         /* synthesize floor output vector */

  1024.         {

  1025.             int i;

  1026.             int order=vf->order;

  1027.             float wstep=M_PI/vf->bark_map_size;

  1028. 

  1029.             for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }

  1030. 

  1031.             AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",

  1032.                      vf->map_size, order, wstep);

  1033. 

  1034.             i=0;

  1035.             while(i<vf->map_size[blockflag]) {

  1036.                 int j, iter_cond=vf->map[blockflag][i];

  1037.                 float p=0.5f;

  1038.                 float q=0.5f;

  1039.                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times

  1040. 

  1041.                 /* similar part for the q and p products */

  1042.                 for(j=0;j+1<order;j+=2) {

  1043.                     q *= lsp[j]  -two_cos_w;

  1044.                     p *= lsp[j+1]-two_cos_w;

  1045.                 }

  1046.                 if(j==order) { // even order

  1047.                     p *= p*(2.0f-two_cos_w);

  1048.                     q *= q*(2.0f+two_cos_w);

  1049.                 }

  1050.                 else { // odd order

  1051.                     q *= two_cos_w-lsp[j]; // one more time for q

  1052. 

  1053.                     /* final step and square */

  1054.                     p *= p*(4.f-two_cos_w*two_cos_w);

  1055.                     q *= q;

  1056.                 }

  1057. 

  1058.                 /* calculate linear floor value */

  1059.                 {

  1060.                     q=exp( (

  1061.                              ( (amplitude*vf->amplitude_offset)/

  1062.                                (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )

  1063.                              - vf->amplitude_offset ) * .11512925f

  1064.                          );

  1065.                 }

  1066. 

  1067.                 /* fill vector */

  1068.                 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);

  1069.             }

  1070.         }

  1071.     }

  1072.     else {

  1073.         /* this channel is unused */

  1074.         return 1;

  1075.     }

  1076. 

  1077.     AV_DEBUG(" Floor0 decoded\n");

  1078. 

  1079.     return 0;

  1080. }

  1081. 

  1082. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {

  1083.     vorbis_floor1 * vf=&vfu->t1;

  1084.     GetBitContext *gb=&vc->gb;

  1085.     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };

  1086.     uint_fast16_t range=range_v[vf->multiplier-1];

  1087.     uint_fast16_t floor1_Y[vf->x_list_dim];

  1088.     uint_fast16_t floor1_Y_final[vf->x_list_dim];

  1089.     int floor1_flag[vf->x_list_dim];

  1090.     uint_fast8_t class_;

  1091.     uint_fast8_t cdim;

  1092.     uint_fast8_t cbits;

  1093.     uint_fast8_t csub;

  1094.     uint_fast8_t cval;

  1095.     int_fast16_t book;

  1096.     uint_fast16_t offset;

  1097.     uint_fast16_t i,j;

  1098.     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?

  1099.     int_fast16_t dy, err;

  1100. 

  1101. 

  1102.     if (!get_bits1(gb)) return 1; // silence

  1103. 

  1104. // Read values (or differences) for the floor's points

  1105. 

  1106.     floor1_Y[0]=get_bits(gb, ilog(range-1));

  1107.     floor1_Y[1]=get_bits(gb, ilog(range-1));

  1108. 

  1109.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1110. 

  1111.     offset=2;

  1112.     for(i=0;i<vf->partitions;++i) {

  1113.         class_=vf->partition_class[i];

  1114.         cdim=vf->class_dimensions[class_];

  1115.         cbits=vf->class_subclasses[class_];

  1116.         csub=(1<<cbits)-1;

  1117.         cval=0;

  1118. 

  1119.         AV_DEBUG("Cbits %d \n", cbits);

  1120. 

  1121.         if (cbits) { // this reads all subclasses for this partition's class

  1122.             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,

  1123.             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);

  1124.         }

  1125. 

  1126.         for(j=0;j<cdim;++j) {

  1127.             book=vf->subclass_books[class_][cval & csub];

  1128. 

  1129.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1130. 

  1131.             cval=cval>>cbits;

  1132.             if (book>-1) {

  1133.                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,

  1134.                 vc->codebooks[book].nb_bits, 3);

  1135.             } else {

  1136.                 floor1_Y[offset+j]=0;

  1137.             }

  1138. 

  1139.             AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);

  1140.         }

  1141.         offset+=cdim;

  1142.     }

  1143. 

  1144. // Amplitude calculation from the differences

  1145. 

  1146.     floor1_flag[0]=1;

  1147.     floor1_flag[1]=1;

  1148.     floor1_Y_final[0]=floor1_Y[0];

  1149.     floor1_Y_final[1]=floor1_Y[1];

  1150. 

  1151.     for(i=2;i<vf->x_list_dim;++i) {

  1152.         uint_fast16_t val, highroom, lowroom, room;

  1153.         uint_fast16_t high_neigh_offs;

  1154.         uint_fast16_t low_neigh_offs;

  1155. 

  1156.         low_neigh_offs=vf->list[i].low;

  1157.         high_neigh_offs=vf->list[i].high;

  1158.         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin

  1159.         adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;

  1160.         ady= FFABS(dy);

  1161.         err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);

  1162.         off=(int16_t)err/(int16_t)adx;

  1163.         if (dy<0) {

  1164.             predicted=floor1_Y_final[low_neigh_offs]-off;

  1165.         } else {

  1166.             predicted=floor1_Y_final[low_neigh_offs]+off;

  1167.         } // render_point end

  1168. 

  1169.         val=floor1_Y[i];

  1170.         highroom=range-predicted;

  1171.         lowroom=predicted;

  1172.         if (highroom < lowroom) {

  1173.             room=highroom*2;

  1174.         } else {

  1175.             room=lowroom*2;   // SPEC mispelling

  1176.         }

  1177.         if (val) {

  1178.             floor1_flag[low_neigh_offs]=1;

  1179.             floor1_flag[high_neigh_offs]=1;

  1180.             floor1_flag[i]=1;

  1181.             if (val>=room) {

  1182.                 if (highroom > lowroom) {

  1183.                     floor1_Y_final[i]=val-lowroom+predicted;

  1184.                 } else {

  1185.                     floor1_Y_final[i]=predicted-val+highroom-1;

  1186.                 }

  1187.             } else {

  1188.                 if (val & 1) {

  1189.                     floor1_Y_final[i]=predicted-(val+1)/2;

  1190.                 } else {

  1191.                     floor1_Y_final[i]=predicted+val/2;

  1192.                 }

  1193.             }

  1194.         } else {

  1195.             floor1_flag[i]=0;

  1196.             floor1_Y_final[i]=predicted;

  1197.         }

  1198. 

  1199.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);

  1200.     }

  1201. 

  1202. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1203. 

  1204.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1205. 

  1206.     AV_DEBUG(" Floor decoded\n");

  1207. 

  1208.     return 0;

  1209. }

  1210. 

  1211. // Read and decode residue

  1212. 

  1213. 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) {

  1214.     GetBitContext *gb=&vc->gb;

  1215.     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;

  1216.     uint_fast16_t n_to_read=vr->end-vr->begin;

  1217.     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;

  1218.     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];

  1219.     uint_fast8_t pass;

  1220.     uint_fast8_t ch_used;

  1221.     uint_fast8_t i,j,l;

  1222.     uint_fast16_t k;

  1223. 

  1224.     if (vr_type==2) {

  1225.         for(j=1;j<ch;++j) {

  1226.                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input

  1227.         }

  1228.         if (do_not_decode[0]) return 0;

  1229.         ch_used=1;

  1230.     } else {

  1231.         ch_used=ch;

  1232.     }

  1233. 

  1234.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1235. 

  1236.     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?

  1237.         uint_fast16_t voffset;

  1238.         uint_fast16_t partition_count;

  1239.         uint_fast16_t j_times_ptns_to_read;

  1240. 

  1241.         voffset=vr->begin;

  1242.         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error

  1243.             if (!pass) {

  1244.                 uint_fast32_t inverse_class = ff_inverse[vr->classifications];

  1245.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1246.                     if (!do_not_decode[j]) {

  1247.                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1248.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1249. 

  1250.                         AV_DEBUG("Classword: %d \n", temp);

  1251. 

  1252.                         assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]

  1253.                         for(i=0;i<c_p_c;++i) {

  1254.                             uint_fast32_t temp2;

  1255. 

  1256.                             temp2=(((uint_fast64_t)temp) * inverse_class)>>32;

  1257.                             if (partition_count+c_p_c-1-i < ptns_to_read) {

  1258.                                 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;

  1259.                             }

  1260.                             temp=temp2;

  1261.                         }

  1262.                     }

  1263.                     j_times_ptns_to_read+=ptns_to_read;

  1264.                 }

  1265.             }

  1266.             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {

  1267.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1268.                     uint_fast16_t voffs;

  1269. 

  1270.                     if (!do_not_decode[j]) {

  1271.                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];

  1272.                         int_fast16_t vqbook=vr->books[vqclass][pass];

  1273. 

  1274.                         if (vqbook>=0 && vc->codebooks[vqbook].codevectors) {

  1275.                             uint_fast16_t coffs;

  1276.                             unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64

  1277.                             uint_fast16_t step= dim==1 ? vr->partition_size

  1278.                                               : FASTDIV(vr->partition_size, dim);

  1279.                             vorbis_codebook codebook= vc->codebooks[vqbook];

  1280. 

  1281.                             if (vr_type==0) {

  1282. 

  1283.                                 voffs=voffset+j*vlen;

  1284.                                 for(k=0;k<step;++k) {

  1285.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1286.                                     for(l=0;l<dim;++l) {

  1287.                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH

  1288.                                     }

  1289.                                 }

  1290.                             }

  1291.                             else if (vr_type==1) {

  1292.                                 voffs=voffset+j*vlen;

  1293.                                 for(k=0;k<step;++k) {

  1294.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1295.                                     for(l=0;l<dim;++l, ++voffs) {

  1296.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1297. 

  1298.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1299.                                     }

  1300.                                 }

  1301.                             }

  1302.                             else if (vr_type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized

  1303.                                 voffs=voffset>>1;

  1304. 

  1305.                                 if(dim==2) {

  1306.                                     for(k=0;k<step;++k) {

  1307.                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1308.                                         vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH

  1309.                                         vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH

  1310.                                     }

  1311.                                 } else if(dim==4) {

  1312.                                     for(k=0;k<step;++k, voffs+=2) {

  1313.                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1314.                                         vec[voffs       ]+=codebook.codevectors[coffs  ];  // FPMATH

  1315.                                         vec[voffs+1     ]+=codebook.codevectors[coffs+2];  // FPMATH

  1316.                                         vec[voffs+vlen  ]+=codebook.codevectors[coffs+1];  // FPMATH

  1317.                                         vec[voffs+vlen+1]+=codebook.codevectors[coffs+3];  // FPMATH

  1318.                                     }

  1319.                                 } else

  1320.                                 for(k=0;k<step;++k) {

  1321.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1322.                                     for(l=0;l<dim;l+=2, voffs++) {

  1323.                                         vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH

  1324.                                         vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH

  1325. 

  1326.                                         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);

  1327.                                     }

  1328.                                 }

  1329. 

  1330.                             }

  1331.                             else if (vr_type==2) {

  1332.                                 voffs=voffset;

  1333. 

  1334.                                 for(k=0;k<step;++k) {

  1335.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1336.                                     for(l=0;l<dim;++l, ++voffs) {

  1337.                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %

  1338. 

  1339.                                         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);

  1340.                                     }

  1341.                                 }

  1342.                             }

  1343.                         }

  1344.                     }

  1345.                     j_times_ptns_to_read+=ptns_to_read;

  1346.                 }

  1347.                 ++partition_count;

  1348.                 voffset+=vr->partition_size;

  1349.             }

  1350.         }

  1351.     }

  1352.     return 0;

  1353. }

  1354. 

  1355. 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)

  1356. {

  1357.     if (vr->type==2)

  1358.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1359.     else if (vr->type==1)

  1360.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1361.     else if (vr->type==0)

  1362.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1363.     else {

  1364.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1365.         return 1;

  1366.     }

  1367. }

  1368. 

  1369. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1370. {

  1371.     int i;

  1372.     for(i=0; i<blocksize; i++)

  1373.     {

  1374.         if (mag[i]>0.0) {

  1375.             if (ang[i]>0.0) {

  1376.                 ang[i]=mag[i]-ang[i];

  1377.             } else {

  1378.                 float temp=ang[i];

  1379.                 ang[i]=mag[i];

  1380.                 mag[i]+=temp;

  1381.             }

  1382.         } else {

  1383.             if (ang[i]>0.0) {

  1384.                 ang[i]+=mag[i];

  1385.             } else {

  1386.                 float temp=ang[i];

  1387.                 ang[i]=mag[i];

  1388.                 mag[i]-=temp;

  1389.             }

  1390.         }

  1391.     }

  1392. }

  1393. 

  1394. static void copy_normalize(float *dst, float *src, int len, int exp_bias, float add_bias)

  1395. {

  1396.     int i;

  1397.     if(exp_bias) {

  1398.         memcpy(dst, src, len * sizeof(float));

  1399.     } else {

  1400.         for(i=0; i<len; i++)

  1401.             dst[i] = src[i] + add_bias;

  1402.     }

  1403. }

  1404. 

  1405. // Decode the audio packet using the functions above

  1406. 

  1407. static int vorbis_parse_audio_packet(vorbis_context *vc) {

  1408.     GetBitContext *gb=&vc->gb;

  1409. 

  1410.     uint_fast8_t previous_window=vc->previous_window;

  1411.     uint_fast8_t mode_number;

  1412.     uint_fast8_t blockflag;

  1413.     uint_fast16_t blocksize;

  1414.     int_fast32_t i,j;

  1415.     uint_fast8_t no_residue[vc->audio_channels];

  1416.     uint_fast8_t do_not_decode[vc->audio_channels];

  1417.     vorbis_mapping *mapping;

  1418.     float *ch_res_ptr=vc->channel_residues;

  1419.     float *ch_floor_ptr=vc->channel_floors;

  1420.     uint_fast8_t res_chan[vc->audio_channels];

  1421.     uint_fast8_t res_num=0;

  1422.     int_fast16_t retlen=0;

  1423.     float fadd_bias = vc->add_bias;

  1424. 

  1425.     if (get_bits1(gb)) {

  1426.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1427.         return -1; // packet type not audio

  1428.     }

  1429. 

  1430.     if (vc->mode_count==1) {

  1431.         mode_number=0;

  1432.     } else {

  1433.         mode_number=get_bits(gb, ilog(vc->mode_count-1));

  1434.     }

  1435.     vc->mode_number=mode_number;

  1436.     mapping=&vc->mappings[vc->modes[mode_number].mapping];

  1437. 

  1438.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1439. 

  1440.     blockflag=vc->modes[mode_number].blockflag;

  1441.     blocksize=vc->blocksize[blockflag];

  1442.     if (blockflag) {

  1443.         skip_bits(gb, 2); // previous_window, next_window

  1444.     }

  1445. 

  1446.     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1447.     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1448. 

  1449. // Decode floor

  1450. 

  1451.     for(i=0;i<vc->audio_channels;++i) {

  1452.         vorbis_floor *floor;

  1453.         if (mapping->submaps>1) {

  1454.             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1455.         } else {

  1456.             floor=&vc->floors[mapping->submap_floor[0]];

  1457.         }

  1458. 

  1459.         no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);

  1460.         ch_floor_ptr+=blocksize/2;

  1461.     }

  1462. 

  1463. // Nonzero vector propagate

  1464. 

  1465.     for(i=mapping->coupling_steps-1;i>=0;--i) {

  1466.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1467.             no_residue[mapping->magnitude[i]]=0;

  1468.             no_residue[mapping->angle[i]]=0;

  1469.         }

  1470.     }

  1471. 

  1472. // Decode residue

  1473. 

  1474.     for(i=0;i<mapping->submaps;++i) {

  1475.         vorbis_residue *residue;

  1476.         uint_fast8_t ch=0;

  1477. 

  1478.         for(j=0;j<vc->audio_channels;++j) {

  1479.             if ((mapping->submaps==1) || (i=mapping->mux[j])) {

  1480.                 res_chan[j]=res_num;

  1481.                 if (no_residue[j]) {

  1482.                     do_not_decode[ch]=1;

  1483.                 } else {

  1484.                     do_not_decode[ch]=0;

  1485.                 }

  1486.                 ++ch;

  1487.                 ++res_num;

  1488.             }

  1489.         }

  1490.         residue=&vc->residues[mapping->submap_residue[i]];

  1491.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1492. 

  1493.         ch_res_ptr+=ch*blocksize/2;

  1494.     }

  1495. 

  1496. // Inverse coupling

  1497. 

  1498.     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed

  1499.         float *mag, *ang;

  1500. 

  1501.         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;

  1502.         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;

  1503.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);

  1504.     }

  1505. 

  1506. // Dotproduct, MDCT

  1507. 

  1508.     for(j=vc->audio_channels-1;j>=0;j--) {

  1509.         ch_floor_ptr=vc->channel_floors+j*blocksize/2;

  1510.         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;

  1511.         vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);

  1512.         ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);

  1513.     }

  1514. 

  1515. // Overlap/add, save data for next overlapping  FPMATH

  1516. 

  1517.     retlen = (blocksize + vc->blocksize[previous_window])/4;

  1518.     for(j=0;j<vc->audio_channels;j++) {

  1519.         uint_fast16_t bs0=vc->blocksize[0];

  1520.         uint_fast16_t bs1=vc->blocksize[1];

  1521.         float *residue=vc->channel_residues+res_chan[j]*blocksize/2;

  1522.         float *saved=vc->saved+j*bs1/4;

  1523.         float *ret=vc->channel_floors+j*retlen;

  1524.         float *buf=residue;

  1525.         const float *win=vc->win[blockflag&previous_window];

  1526. 

  1527.         if(blockflag == previous_window) {

  1528.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize/4);

  1529.         } else if(blockflag > previous_window) {

  1530.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0/4);

  1531.             copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);

  1532.         } else {

  1533.             copy_normalize(ret, saved, (bs1-bs0)/4, vc->exp_bias, fadd_bias);

  1534.             vc->dsp.vector_fmul_window(ret+(bs1-bs0)/4, saved+(bs1-bs0)/4, buf, win, fadd_bias, bs0/4);

  1535.         }

  1536.         memcpy(saved, buf+blocksize/4, blocksize/4*sizeof(float));

  1537.     }

  1538. 

  1539.     vc->previous_window = blockflag;

  1540.     return retlen;

  1541. }

  1542. 

  1543. // Return the decoded audio packet through the standard api

  1544. 

  1545. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1546.                         void *data, int *data_size,

  1547.                         AVPacket *avpkt)

  1548. {

  1549.     const uint8_t *buf = avpkt->data;

  1550.     int buf_size = avpkt->size;

  1551.     vorbis_context *vc = avccontext->priv_data ;

  1552.     GetBitContext *gb = &(vc->gb);

  1553.     const float *channel_ptrs[vc->audio_channels];

  1554.     int i;

  1555. 

  1556.     int_fast16_t len;

  1557. 

  1558.     if(!buf_size){

  1559.         return 0;

  1560.     }

  1561. 

  1562.     AV_DEBUG("packet length %d \n", buf_size);

  1563. 

  1564.     init_get_bits(gb, buf, buf_size*8);

  1565. 

  1566.     len=vorbis_parse_audio_packet(vc);

  1567. 

  1568.     if (len<=0) {

  1569.         *data_size=0;

  1570.         return buf_size;

  1571.     }

  1572. 

  1573.     if (!vc->first_frame) {

  1574.         vc->first_frame=1;

  1575.         *data_size=0;

  1576.         return buf_size ;

  1577.     }

  1578. 

  1579.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1580. 

  1581.     for(i=0; i<vc->audio_channels; i++)

  1582.         channel_ptrs[i] = vc->channel_floors+i*len;

  1583.     vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);

  1584.     *data_size=len*2*vc->audio_channels;

  1585. 

  1586.     return buf_size ;

  1587. }

  1588. 

  1589. // Close decoder

  1590. 

  1591. static av_cold int vorbis_decode_close(AVCodecContext *avccontext) {

  1592.     vorbis_context *vc = avccontext->priv_data;

  1593. 

  1594.     vorbis_free(vc);

  1595. 

  1596.     return 0 ;

  1597. }

  1598. 

  1599. AVCodec vorbis_decoder = {

  1600.     "vorbis",

  1601.     CODEC_TYPE_AUDIO,

  1602.     CODEC_ID_VORBIS,

  1603.     sizeof(vorbis_context),

  1604.     vorbis_decode_init,

  1605.     NULL,

  1606.     vorbis_decode_close,

  1607.     vorbis_decode_frame,

  1608.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1609. };