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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. #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.     FFTContext 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. 

  216. // Parse setup header -------------------------------------------------

  217. 

  218. // Process codebooks part

  219. 

  220. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {

  221.     uint_fast16_t cb;

  222.     uint8_t *tmp_vlc_bits;

  223.     uint32_t *tmp_vlc_codes;

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

  225. 

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

  227. 

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

  229. 

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

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

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

  233. 

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

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

  236.         uint_fast8_t ordered;

  237.         uint_fast32_t t, used_entries=0;

  238.         uint_fast32_t entries;

  239. 

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

  241. 

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

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

  244.             goto error;

  245.         }

  246. 

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

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

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

  250.             goto error;

  251.         }

  252.         entries=get_bits(gb, 24);

  253.         if (entries>V_MAX_VLCS) {

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

  255.             goto error;

  256.         }

  257. 

  258.         ordered=get_bits1(gb);

  259. 

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

  261. 

  262.         if (!ordered) {

  263.             uint_fast16_t ce;

  264.             uint_fast8_t flag;

  265.             uint_fast8_t sparse=get_bits1(gb);

  266. 

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

  268. 

  269.             if (sparse) {

  270.                 AV_DEBUG(" sparse \n");

  271. 

  272.                 used_entries=0;

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

  274.                     flag=get_bits1(gb);

  275.                     if (flag) {

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

  277.                         ++used_entries;

  278.                     }

  279.                     else tmp_vlc_bits[ce]=0;

  280.                 }

  281.             } else {

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

  283. 

  284.                 used_entries=entries;

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

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

  287.                 }

  288.             }

  289.         } else {

  290.             uint_fast16_t current_entry=0;

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

  292. 

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

  294. 

  295.             used_entries=entries;

  296.             for(;current_entry<used_entries && current_length <= 32;++current_length) {

  297.                 uint_fast16_t i, number;

  298. 

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

  300. 

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

  302. 

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

  304. 

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

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

  307.                 }

  308. 

  309.                 current_entry+=number;

  310.             }

  311.             if (current_entry>used_entries) {

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

  313.                 goto error;

  314.             }

  315.         }

  316. 

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

  318. 

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

  320. 

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

  322. 

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

  324.             uint_fast16_t i, j, k;

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

  326.             uint_fast16_t codebook_multiplicands[codebook_lookup_values];

  327. 

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

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

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

  331.             uint_fast8_t codebook_sequence_p=get_bits1(gb);

  332. 

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

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

  335. 

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

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

  338. 

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

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

  341.             }

  342. 

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

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

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

  346.                 uint_fast8_t dim=codebook_setup->dimensions;

  347. 

  348.                 if (tmp_vlc_bits[i]) {

  349.                     float last=0.0;

  350.                     uint_fast32_t lookup_offset=i;

  351. 

  352. #ifdef V_DEBUG

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

  354. #endif

  355. 

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

  357.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  359.                         if (codebook_sequence_p) {

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

  361.                         }

  362.                         lookup_offset/=codebook_lookup_values;

  363.                     }

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

  365. 

  366. #ifdef V_DEBUG

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

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

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

  370.                     }

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

  372. #endif

  373. 

  374.                     ++j;

  375.                 }

  376.             }

  377.             if (j!=used_entries) {

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

  379.                 goto error;

  380.             }

  381.             entries=used_entries;

  382.         }

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

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

  385.             goto error;

  386.         }

  387. 

  388. // Initialize VLC table

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

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

  391.             goto error;

  392.         }

  393.         codebook_setup->maxdepth=0;

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

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

  396. 

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

  398.         else                                       codebook_setup->nb_bits=V_NB_BITS;

  399. 

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

  401. 

  402.         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)) {

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

  404.             goto error;

  405.         }

  406.     }

  407. 

  408.     av_free(tmp_vlc_bits);

  409.     av_free(tmp_vlc_codes);

  410.     return 0;

  411. 

  412. // Error:

  413. error:

  414.     av_free(tmp_vlc_bits);

  415.     av_free(tmp_vlc_codes);

  416.     return -1;

  417. }

  418. 

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

  420. 

  421. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {

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

  423.     uint_fast8_t i;

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

  425. 

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

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

  428. 

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

  430. 

  431.         if (vorbis_tdtransform) {

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

  433.             return -1;

  434.         }

  435.     }

  436.     return 0;

  437. }

  438. 

  439. // Process floors part

  440. 

  441. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  442.                                          vorbis_floor_data *vfu, float *vec);

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

  444. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  445.                                          vorbis_floor_data *vfu, float *vec);

  446. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {

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

  448.     uint_fast16_t i,j,k;

  449. 

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

  451. 

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

  453. 

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

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

  456. 

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

  458. 

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

  460. 

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

  462.             uint_fast8_t maximum_class=0;

  463.             uint_fast8_t rangebits;

  464.             uint_fast16_t floor1_values=2;

  465. 

  466.             floor_setup->decode=vorbis_floor1_decode;

  467. 

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

  469. 

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

  471. 

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

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

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

  475. 

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

  477. 

  478.             }

  479. 

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

  481. 

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

  483. 

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

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

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

  487. 

  488.                 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]);

  489. 

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

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

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

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

  494.                         return -1;

  495.                     }

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

  497. 

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

  499.                 }

  500. 

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

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

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

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

  505.                         return -1;

  506.                     }

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

  508. 

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

  510.                 }

  511.             }

  512. 

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

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

  515. 

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

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

  518.             }

  519. 

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

  521. 

  522. 

  523.             rangebits=get_bits(gb, 4);

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

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

  526. 

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

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

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

  530. 

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

  532.                 }

  533.             }

  534. 

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

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

  537.         }

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

  539.             uint_fast8_t max_codebook_dim=0;

  540. 

  541.             floor_setup->decode=vorbis_floor0_decode;

  542. 

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

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

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

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

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

  548.              * 2^0 - 1 == 0                             */

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

  550.               av_log(vc->avccontext, AV_LOG_ERROR,

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

  552.               return -1;

  553.             }

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

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

  556. 

  557.             /* allocate mem for booklist */

  558.             floor_setup->data.t0.book_list=

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

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

  561.             /* read book indexes */

  562.             {

  563.                 int idx;

  564.                 uint_fast8_t book_idx;

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

  566.                     book_idx=get_bits(gb, 8);

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

  568.                         return -1;

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

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

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

  572.                 }

  573.             }

  574. 

  575.             create_map( vc, i );

  576. 

  577.             /* allocate mem for lsp coefficients */

  578.             {

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

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

  581.                 floor_setup->data.t0.lsp=

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

  583.                               * sizeof(float));

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

  585.             }

  586. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  600.             {

  601.               int idx;

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

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

  604.                   idx+1,

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

  606.               }

  607.             }

  608. #endif

  609.         }

  610.         else {

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

  612.             return -1;

  613.         }

  614.     }

  615.     return 0;

  616. }

  617. 

  618. // Process residues part

  619. 

  620. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){

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

  622.     uint_fast8_t i, j, k;

  623. 

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

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

  626. 

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

  628. 

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

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

  631.         uint_fast8_t cascade[64];

  632.         uint_fast8_t high_bits;

  633.         uint_fast8_t low_bits;

  634. 

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

  636. 

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

  638. 

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

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

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

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

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

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

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

  646.             av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %"PRIdFAST16", %"PRIdFAST32", %"PRIdFAST32", %"PRIdFAST32", %"PRIdFAST32"\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1]/2);

  647.             return -1;

  648.         }

  649. 

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

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

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

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

  654.             return -1;

  655.         }

  656. 

  657.         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,

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

  659. 

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

  661.             high_bits=0;

  662.             low_bits=get_bits(gb, 3);

  663.             if (get_bits1(gb)) {

  664.                 high_bits=get_bits(gb, 5);

  665.             }

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

  667. 

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

  669.         }

  670. 

  671.         res_setup->maxpass=0;

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

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

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

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

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

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

  678.                         return -1;

  679.                     }

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

  681. 

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

  683. 

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

  685.                         res_setup->maxpass=k;

  686.                     }

  687.                 } else {

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

  689.                 }

  690.             }

  691.         }

  692.     }

  693.     return 0;

  694. }

  695. 

  696. // Process mappings part

  697. 

  698. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {

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

  700.     uint_fast8_t i, j;

  701. 

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

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

  704. 

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

  706. 

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

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

  709. 

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

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

  712.             return -1;

  713.         }

  714.         if (get_bits1(gb)) {

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

  716.         } else {

  717.             mapping_setup->submaps=1;

  718.         }

  719. 

  720.         if (get_bits1(gb)) {

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

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

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

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

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

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

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

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

  729.                     return -1;

  730.                 }

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

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

  733.                     return -1;

  734.                 }

  735.             }

  736.         } else {

  737.             mapping_setup->coupling_steps=0;

  738.         }

  739. 

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

  741. 

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

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

  744.             return -1; // following spec.

  745.         }

  746. 

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

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

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

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

  751.             }

  752.         }

  753. 

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

  755.             int bits;

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

  757.             bits=get_bits(gb, 8);

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

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

  760.                 return -1;

  761.             }

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

  763.             bits=get_bits(gb, 8);

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

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

  766.                 return -1;

  767.             }

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

  769. 

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

  771.         }

  772.     }

  773.     return 0;

  774. }

  775. 

  776. // Process modes part

  777. 

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

  779. {

  780.     vorbis_floor * floors=vc->floors;

  781.     vorbis_floor0 * vf;

  782.     int idx;

  783.     int_fast8_t blockflag;

  784.     int_fast32_t * map;

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

  786. 

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

  788.     {

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

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

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

  792. 

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

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

  795. 

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

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

  798.                               ((vf->bark_map_size)/

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

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

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

  802.         }

  803.     }

  804.     map[n]=-1;

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

  806.     }

  807. 

  808. #   ifdef V_DEBUG

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

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

  811.                  idx, map[idx]);

  812.     }

  813. #   endif

  814. }

  815. 

  816. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {

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

  818.     uint_fast8_t i;

  819. 

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

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

  822. 

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

  824. 

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

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

  827. 

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

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

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

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

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

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

  834.             return -1;

  835.         }

  836. 

  837.         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);

  838.     }

  839.     return 0;

  840. }

  841. 

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

  843. 

  844. static int vorbis_parse_setup_hdr(vorbis_context *vc) {

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

  846. 

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

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

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

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

  851.         return -1;

  852.     }

  853. 

  854.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  856.         return -2;

  857.     }

  858.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  860.         return -3;

  861.     }

  862.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  864.         return -4;

  865.     }

  866.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  868.         return -5;

  869.     }

  870.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  872.         return -6;

  873.     }

  874.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  876.         return -7;

  877.     }

  878.     if (!get_bits1(gb)) {

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

  880.         return -8; // framing flag bit unset error

  881.     }

  882. 

  883.     return 0;

  884. }

  885. 

  886. // Process the identification header

  887. 

  888. static int vorbis_parse_id_hdr(vorbis_context *vc){

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

  890.     uint_fast8_t bl0, bl1;

  891. 

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

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

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

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

  896.         return -1;

  897.     }

  898. 

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

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

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

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

  903.         return -1;

  904.     }

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

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

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

  908.         return -1;

  909.     }

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

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

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

  913.     bl0=get_bits(gb, 4);

  914.     bl1=get_bits(gb, 4);

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

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

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

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

  919.         return -3;

  920.     }

  921.     // output format int16

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

  923.                                              AVCODEC_MAX_AUDIO_FRAME_SIZE) {

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

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

  926.         return -4;

  927.     }

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

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

  930. 

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

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

  933.         return -2;

  934.     }

  935. 

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

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

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

  939.     vc->previous_window=0;

  940. 

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

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

  943. 

  944.     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 ",

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

  946. 

  947. /*

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

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

  950.         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)));

  951.     }

  952. */

  953. 

  954.     return 0;

  955. }

  956. 

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

  958. 

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

  960.     vorbis_context *vc = avccontext->priv_data ;

  961.     uint8_t *headers = avccontext->extradata;

  962.     int headers_len=avccontext->extradata_size;

  963.     uint8_t *header_start[3];

  964.     int header_len[3];

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

  966.     int hdr_type;

  967. 

  968.     vc->avccontext = avccontext;

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

  970. 

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

  972.         vc->add_bias = 385;

  973.         vc->exp_bias = 0;

  974.     } else {

  975.         vc->add_bias = 0;

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

  977.     }

  978. 

  979.     if (!headers_len) {

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

  981.         return -1;

  982.     }

  983. 

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

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

  986.         return -1;

  987.     }

  988. 

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

  990.     hdr_type=get_bits(gb, 8);

  991.     if (hdr_type!=1) {

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

  993.         return -1;

  994.     }

  995.     if (vorbis_parse_id_hdr(vc)) {

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

  997.         vorbis_free(vc);

  998.         return -1;

  999.     }

  1000. 

  1001.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1002.     hdr_type=get_bits(gb, 8);

  1003.     if (hdr_type!=5) {

  1004.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1005.         vorbis_free(vc);

  1006.         return -1;

  1007.     }

  1008.     if (vorbis_parse_setup_hdr(vc)) {

  1009.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1010.         vorbis_free(vc);

  1011.         return -1;

  1012.     }

  1013. 

  1014.     avccontext->channels = vc->audio_channels;

  1015.     avccontext->sample_rate = vc->audio_samplerate;

  1016.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1])>>2;

  1017.     avccontext->sample_fmt = SAMPLE_FMT_S16;

  1018. 

  1019.     return 0 ;

  1020. }

  1021. 

  1022. // Decode audiopackets -------------------------------------------------

  1023. 

  1024. // Read and decode floor

  1025. 

  1026. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  1027.                                          vorbis_floor_data *vfu, float *vec) {

  1028.     vorbis_floor0 * vf=&vfu->t0;

  1029.     float * lsp=vf->lsp;

  1030.     uint_fast32_t amplitude;

  1031.     uint_fast32_t book_idx;

  1032.     uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;

  1033. 

  1034.     amplitude=get_bits(&vc->gb, vf->amplitude_bits);

  1035.     if (amplitude>0) {

  1036.         float last = 0;

  1037.         uint_fast16_t lsp_len = 0;

  1038.         uint_fast16_t idx;

  1039.         vorbis_codebook codebook;

  1040. 

  1041.         book_idx=get_bits(&vc->gb, ilog(vf->num_books));

  1042.         if ( book_idx >= vf->num_books ) {

  1043.             av_log( vc->avccontext, AV_LOG_ERROR,

  1044.                     "floor0 dec: booknumber too high!\n" );

  1045.             book_idx= 0;

  1046.             //FIXME: look above

  1047.         }

  1048.         AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );

  1049.         codebook=vc->codebooks[vf->book_list[book_idx]];

  1050. 

  1051.         while (lsp_len<vf->order) {

  1052.             int vec_off;

  1053. 

  1054.             AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );

  1055.             AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );

  1056.             /* read temp vector */

  1057.             vec_off=get_vlc2(&vc->gb,

  1058.                              codebook.vlc.table,

  1059.                              codebook.nb_bits,

  1060.                              codebook.maxdepth ) *

  1061.                              codebook.dimensions;

  1062.             AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );

  1063.             /* copy each vector component and add last to it */

  1064.             for (idx=0; idx<codebook.dimensions; ++idx) {

  1065.                 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;

  1066.             }

  1067.             last=lsp[lsp_len+idx-1]; /* set last to last vector component */

  1068. 

  1069.             lsp_len += codebook.dimensions;

  1070.         }

  1071. #ifdef V_DEBUG

  1072.         /* DEBUG: output lsp coeffs */

  1073.         {

  1074.             int idx;

  1075.             for ( idx = 0; idx < lsp_len; ++idx )

  1076.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );

  1077.         }

  1078. #endif

  1079. 

  1080.         /* synthesize floor output vector */

  1081.         {

  1082.             int i;

  1083.             int order=vf->order;

  1084.             float wstep=M_PI/vf->bark_map_size;

  1085. 

  1086.             for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }

  1087. 

  1088.             AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",

  1089.                      vf->map_size, order, wstep);

  1090. 

  1091.             i=0;

  1092.             while(i<vf->map_size[blockflag]) {

  1093.                 int j, iter_cond=vf->map[blockflag][i];

  1094.                 float p=0.5f;

  1095.                 float q=0.5f;

  1096.                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times

  1097. 

  1098.                 /* similar part for the q and p products */

  1099.                 for(j=0;j+1<order;j+=2) {

  1100.                     q *= lsp[j]  -two_cos_w;

  1101.                     p *= lsp[j+1]-two_cos_w;

  1102.                 }

  1103.                 if(j==order) { // even order

  1104.                     p *= p*(2.0f-two_cos_w);

  1105.                     q *= q*(2.0f+two_cos_w);

  1106.                 }

  1107.                 else { // odd order

  1108.                     q *= two_cos_w-lsp[j]; // one more time for q

  1109. 

  1110.                     /* final step and square */

  1111.                     p *= p*(4.f-two_cos_w*two_cos_w);

  1112.                     q *= q;

  1113.                 }

  1114. 

  1115.                 /* calculate linear floor value */

  1116.                 {

  1117.                     q=exp( (

  1118.                              ( (amplitude*vf->amplitude_offset)/

  1119.                                (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )

  1120.                              - vf->amplitude_offset ) * .11512925f

  1121.                          );

  1122.                 }

  1123. 

  1124.                 /* fill vector */

  1125.                 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);

  1126.             }

  1127.         }

  1128.     }

  1129.     else {

  1130.         /* this channel is unused */

  1131.         return 1;

  1132.     }

  1133. 

  1134.     AV_DEBUG(" Floor0 decoded\n");

  1135. 

  1136.     return 0;

  1137. }

  1138. 

  1139. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {

  1140.     vorbis_floor1 * vf=&vfu->t1;

  1141.     GetBitContext *gb=&vc->gb;

  1142.     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };

  1143.     uint_fast16_t range=range_v[vf->multiplier-1];

  1144.     uint_fast16_t floor1_Y[vf->x_list_dim];

  1145.     uint_fast16_t floor1_Y_final[vf->x_list_dim];

  1146.     int floor1_flag[vf->x_list_dim];

  1147.     uint_fast8_t class_;

  1148.     uint_fast8_t cdim;

  1149.     uint_fast8_t cbits;

  1150.     uint_fast8_t csub;

  1151.     uint_fast8_t cval;

  1152.     int_fast16_t book;

  1153.     uint_fast16_t offset;

  1154.     uint_fast16_t i,j;

  1155.     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?

  1156.     int_fast16_t dy, err;

  1157. 

  1158. 

  1159.     if (!get_bits1(gb)) return 1; // silence

  1160. 

  1161. // Read values (or differences) for the floor's points

  1162. 

  1163.     floor1_Y[0]=get_bits(gb, ilog(range-1));

  1164.     floor1_Y[1]=get_bits(gb, ilog(range-1));

  1165. 

  1166.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1167. 

  1168.     offset=2;

  1169.     for(i=0;i<vf->partitions;++i) {

  1170.         class_=vf->partition_class[i];

  1171.         cdim=vf->class_dimensions[class_];

  1172.         cbits=vf->class_subclasses[class_];

  1173.         csub=(1<<cbits)-1;

  1174.         cval=0;

  1175. 

  1176.         AV_DEBUG("Cbits %d \n", cbits);

  1177. 

  1178.         if (cbits) { // this reads all subclasses for this partition's class

  1179.             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,

  1180.             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);

  1181.         }

  1182. 

  1183.         for(j=0;j<cdim;++j) {

  1184.             book=vf->subclass_books[class_][cval & csub];

  1185. 

  1186.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1187. 

  1188.             cval=cval>>cbits;

  1189.             if (book>-1) {

  1190.                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,

  1191.                 vc->codebooks[book].nb_bits, 3);

  1192.             } else {

  1193.                 floor1_Y[offset+j]=0;

  1194.             }

  1195. 

  1196.             AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);

  1197.         }

  1198.         offset+=cdim;

  1199.     }

  1200. 

  1201. // Amplitude calculation from the differences

  1202. 

  1203.     floor1_flag[0]=1;

  1204.     floor1_flag[1]=1;

  1205.     floor1_Y_final[0]=floor1_Y[0];

  1206.     floor1_Y_final[1]=floor1_Y[1];

  1207. 

  1208.     for(i=2;i<vf->x_list_dim;++i) {

  1209.         uint_fast16_t val, highroom, lowroom, room;

  1210.         uint_fast16_t high_neigh_offs;

  1211.         uint_fast16_t low_neigh_offs;

  1212. 

  1213.         low_neigh_offs=vf->list[i].low;

  1214.         high_neigh_offs=vf->list[i].high;

  1215.         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin

  1216.         adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;

  1217.         ady= FFABS(dy);

  1218.         err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);

  1219.         off=(int16_t)err/(int16_t)adx;

  1220.         if (dy<0) {

  1221.             predicted=floor1_Y_final[low_neigh_offs]-off;

  1222.         } else {

  1223.             predicted=floor1_Y_final[low_neigh_offs]+off;

  1224.         } // render_point end

  1225. 

  1226.         val=floor1_Y[i];

  1227.         highroom=range-predicted;

  1228.         lowroom=predicted;

  1229.         if (highroom < lowroom) {

  1230.             room=highroom*2;

  1231.         } else {

  1232.             room=lowroom*2;   // SPEC mispelling

  1233.         }

  1234.         if (val) {

  1235.             floor1_flag[low_neigh_offs]=1;

  1236.             floor1_flag[high_neigh_offs]=1;

  1237.             floor1_flag[i]=1;

  1238.             if (val>=room) {

  1239.                 if (highroom > lowroom) {

  1240.                     floor1_Y_final[i]=val-lowroom+predicted;

  1241.                 } else {

  1242.                     floor1_Y_final[i]=predicted-val+highroom-1;

  1243.                 }

  1244.             } else {

  1245.                 if (val & 1) {

  1246.                     floor1_Y_final[i]=predicted-(val+1)/2;

  1247.                 } else {

  1248.                     floor1_Y_final[i]=predicted+val/2;

  1249.                 }

  1250.             }

  1251.         } else {

  1252.             floor1_flag[i]=0;

  1253.             floor1_Y_final[i]=predicted;

  1254.         }

  1255. 

  1256.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);

  1257.     }

  1258. 

  1259. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1260. 

  1261.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1262. 

  1263.     AV_DEBUG(" Floor decoded\n");

  1264. 

  1265.     return 0;

  1266. }

  1267. 

  1268. // Read and decode residue

  1269. 

  1270. 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) {

  1271.     GetBitContext *gb=&vc->gb;

  1272.     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;

  1273.     uint_fast16_t n_to_read=vr->end-vr->begin;

  1274.     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;

  1275.     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];

  1276.     uint_fast8_t pass;

  1277.     uint_fast8_t ch_used;

  1278.     uint_fast8_t i,j,l;

  1279.     uint_fast16_t k;

  1280. 

  1281.     if (vr_type==2) {

  1282.         for(j=1;j<ch;++j) {

  1283.                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input

  1284.         }

  1285.         if (do_not_decode[0]) return 0;

  1286.         ch_used=1;

  1287.     } else {

  1288.         ch_used=ch;

  1289.     }

  1290. 

  1291.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1292. 

  1293.     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?

  1294.         uint_fast16_t voffset;

  1295.         uint_fast16_t partition_count;

  1296.         uint_fast16_t j_times_ptns_to_read;

  1297. 

  1298.         voffset=vr->begin;

  1299.         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error

  1300.             if (!pass) {

  1301.                 uint_fast32_t inverse_class = ff_inverse[vr->classifications];

  1302.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1303.                     if (!do_not_decode[j]) {

  1304.                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1305.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1306. 

  1307.                         AV_DEBUG("Classword: %d \n", temp);

  1308. 

  1309.                         assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]

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

  1311.                             uint_fast32_t temp2;

  1312. 

  1313.                             temp2=(((uint_fast64_t)temp) * inverse_class)>>32;

  1314.                             if (partition_count+c_p_c-1-i < ptns_to_read) {

  1315.                                 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;

  1316.                             }

  1317.                             temp=temp2;

  1318.                         }

  1319.                     }

  1320.                     j_times_ptns_to_read+=ptns_to_read;

  1321.                 }

  1322.             }

  1323.             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {

  1324.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1325.                     uint_fast16_t voffs;

  1326. 

  1327.                     if (!do_not_decode[j]) {

  1328.                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];

  1329.                         int_fast16_t vqbook=vr->books[vqclass][pass];

  1330. 

  1331.                         if (vqbook>=0 && vc->codebooks[vqbook].codevectors) {

  1332.                             uint_fast16_t coffs;

  1333.                             unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64

  1334.                             uint_fast16_t step= dim==1 ? vr->partition_size

  1335.                                               : FASTDIV(vr->partition_size, dim);

  1336.                             vorbis_codebook codebook= vc->codebooks[vqbook];

  1337. 

  1338.                             if (vr_type==0) {

  1339. 

  1340.                                 voffs=voffset+j*vlen;

  1341.                                 for(k=0;k<step;++k) {

  1342.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1343.                                     for(l=0;l<dim;++l) {

  1344.                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH

  1345.                                     }

  1346.                                 }

  1347.                             }

  1348.                             else if (vr_type==1) {

  1349.                                 voffs=voffset+j*vlen;

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

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

  1352.                                     for(l=0;l<dim;++l, ++voffs) {

  1353.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1354. 

  1355.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1356.                                     }

  1357.                                 }

  1358.                             }

  1359.                             else if (vr_type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized

  1360.                                 voffs=voffset>>1;

  1361. 

  1362.                                 if(dim==2) {

  1363.                                     for(k=0;k<step;++k) {

  1364.                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1365.                                         vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH

  1366.                                         vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH

  1367.                                     }

  1368.                                 } else if(dim==4) {

  1369.                                     for(k=0;k<step;++k, voffs+=2) {

  1370.                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1371.                                         vec[voffs       ]+=codebook.codevectors[coffs  ];  // FPMATH

  1372.                                         vec[voffs+1     ]+=codebook.codevectors[coffs+2];  // FPMATH

  1373.                                         vec[voffs+vlen  ]+=codebook.codevectors[coffs+1];  // FPMATH

  1374.                                         vec[voffs+vlen+1]+=codebook.codevectors[coffs+3];  // FPMATH

  1375.                                     }

  1376.                                 } else

  1377.                                 for(k=0;k<step;++k) {

  1378.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1379.                                     for(l=0;l<dim;l+=2, voffs++) {

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

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

  1382. 

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

  1384.                                     }

  1385.                                 }

  1386. 

  1387.                             }

  1388.                             else if (vr_type==2) {

  1389.                                 voffs=voffset;

  1390. 

  1391.                                 for(k=0;k<step;++k) {

  1392.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1393.                                     for(l=0;l<dim;++l, ++voffs) {

  1394.                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %

  1395. 

  1396.                                         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);

  1397.                                     }

  1398.                                 }

  1399.                             }

  1400.                         }

  1401.                     }

  1402.                     j_times_ptns_to_read+=ptns_to_read;

  1403.                 }

  1404.                 ++partition_count;

  1405.                 voffset+=vr->partition_size;

  1406.             }

  1407.         }

  1408.     }

  1409.     return 0;

  1410. }

  1411. 

  1412. 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)

  1413. {

  1414.     if (vr->type==2)

  1415.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1416.     else if (vr->type==1)

  1417.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1418.     else if (vr->type==0)

  1419.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1420.     else {

  1421.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1422.         return -1;

  1423.     }

  1424. }

  1425. 

  1426. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1427. {

  1428.     int i;

  1429.     for(i=0; i<blocksize; i++)

  1430.     {

  1431.         if (mag[i]>0.0) {

  1432.             if (ang[i]>0.0) {

  1433.                 ang[i]=mag[i]-ang[i];

  1434.             } else {

  1435.                 float temp=ang[i];

  1436.                 ang[i]=mag[i];

  1437.                 mag[i]+=temp;

  1438.             }

  1439.         } else {

  1440.             if (ang[i]>0.0) {

  1441.                 ang[i]+=mag[i];

  1442.             } else {

  1443.                 float temp=ang[i];

  1444.                 ang[i]=mag[i];

  1445.                 mag[i]-=temp;

  1446.             }

  1447.         }

  1448.     }

  1449. }

  1450. 

  1451. static void copy_normalize(float *dst, float *src, int len, int exp_bias, float add_bias)

  1452. {

  1453.     int i;

  1454.     if(exp_bias) {

  1455.         memcpy(dst, src, len * sizeof(float));

  1456.     } else {

  1457.         for(i=0; i<len; i++)

  1458.             dst[i] = src[i] + add_bias;

  1459.     }

  1460. }

  1461. 

  1462. // Decode the audio packet using the functions above

  1463. 

  1464. static int vorbis_parse_audio_packet(vorbis_context *vc) {

  1465.     GetBitContext *gb=&vc->gb;

  1466. 

  1467.     uint_fast8_t previous_window=vc->previous_window;

  1468.     uint_fast8_t mode_number;

  1469.     uint_fast8_t blockflag;

  1470.     uint_fast16_t blocksize;

  1471.     int_fast32_t i,j;

  1472.     uint_fast8_t no_residue[vc->audio_channels];

  1473.     uint_fast8_t do_not_decode[vc->audio_channels];

  1474.     vorbis_mapping *mapping;

  1475.     float *ch_res_ptr=vc->channel_residues;

  1476.     float *ch_floor_ptr=vc->channel_floors;

  1477.     uint_fast8_t res_chan[vc->audio_channels];

  1478.     uint_fast8_t res_num=0;

  1479.     int_fast16_t retlen=0;

  1480.     float fadd_bias = vc->add_bias;

  1481. 

  1482.     if (get_bits1(gb)) {

  1483.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1484.         return -1; // packet type not audio

  1485.     }

  1486. 

  1487.     if (vc->mode_count==1) {

  1488.         mode_number=0;

  1489.     } else {

  1490.         mode_number=get_bits(gb, ilog(vc->mode_count-1));

  1491.     }

  1492.     if (mode_number>=vc->mode_count) {

  1493.         av_log(vc->avccontext, AV_LOG_ERROR, "mode number %d out of range.\n", mode_number);

  1494.         return -1;

  1495.     }

  1496.     vc->mode_number=mode_number;

  1497.     mapping=&vc->mappings[vc->modes[mode_number].mapping];

  1498. 

  1499.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1500. 

  1501.     blockflag=vc->modes[mode_number].blockflag;

  1502.     blocksize=vc->blocksize[blockflag];

  1503.     if (blockflag) {

  1504.         skip_bits(gb, 2); // previous_window, next_window

  1505.     }

  1506. 

  1507.     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1508.     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1509. 

  1510. // Decode floor

  1511. 

  1512.     for(i=0;i<vc->audio_channels;++i) {

  1513.         vorbis_floor *floor;

  1514.         if (mapping->submaps>1) {

  1515.             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1516.         } else {

  1517.             floor=&vc->floors[mapping->submap_floor[0]];

  1518.         }

  1519. 

  1520.         no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);

  1521.         ch_floor_ptr+=blocksize/2;

  1522.     }

  1523. 

  1524. // Nonzero vector propagate

  1525. 

  1526.     for(i=mapping->coupling_steps-1;i>=0;--i) {

  1527.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1528.             no_residue[mapping->magnitude[i]]=0;

  1529.             no_residue[mapping->angle[i]]=0;

  1530.         }

  1531.     }

  1532. 

  1533. // Decode residue

  1534. 

  1535.     for(i=0;i<mapping->submaps;++i) {

  1536.         vorbis_residue *residue;

  1537.         uint_fast8_t ch=0;

  1538. 

  1539.         for(j=0;j<vc->audio_channels;++j) {

  1540.             if ((mapping->submaps==1) || (i==mapping->mux[j])) {

  1541.                 res_chan[j]=res_num;

  1542.                 if (no_residue[j]) {

  1543.                     do_not_decode[ch]=1;

  1544.                 } else {

  1545.                     do_not_decode[ch]=0;

  1546.                 }

  1547.                 ++ch;

  1548.                 ++res_num;

  1549.             }

  1550.         }

  1551.         residue=&vc->residues[mapping->submap_residue[i]];

  1552.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1553. 

  1554.         ch_res_ptr+=ch*blocksize/2;

  1555.     }

  1556. 

  1557. // Inverse coupling

  1558. 

  1559.     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed

  1560.         float *mag, *ang;

  1561. 

  1562.         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;

  1563.         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;

  1564.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);

  1565.     }

  1566. 

  1567. // Dotproduct, MDCT

  1568. 

  1569.     for(j=vc->audio_channels-1;j>=0;j--) {

  1570.         ch_floor_ptr=vc->channel_floors+j*blocksize/2;

  1571.         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;

  1572.         vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);

  1573.         ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);

  1574.     }

  1575. 

  1576. // Overlap/add, save data for next overlapping  FPMATH

  1577. 

  1578.     retlen = (blocksize + vc->blocksize[previous_window])/4;

  1579.     for(j=0;j<vc->audio_channels;j++) {

  1580.         uint_fast16_t bs0=vc->blocksize[0];

  1581.         uint_fast16_t bs1=vc->blocksize[1];

  1582.         float *residue=vc->channel_residues+res_chan[j]*blocksize/2;

  1583.         float *saved=vc->saved+j*bs1/4;

  1584.         float *ret=vc->channel_floors+j*retlen;

  1585.         float *buf=residue;

  1586.         const float *win=vc->win[blockflag&previous_window];

  1587. 

  1588.         if(blockflag == previous_window) {

  1589.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize/4);

  1590.         } else if(blockflag > previous_window) {

  1591.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0/4);

  1592.             copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);

  1593.         } else {

  1594.             copy_normalize(ret, saved, (bs1-bs0)/4, vc->exp_bias, fadd_bias);

  1595.             vc->dsp.vector_fmul_window(ret+(bs1-bs0)/4, saved+(bs1-bs0)/4, buf, win, fadd_bias, bs0/4);

  1596.         }

  1597.         memcpy(saved, buf+blocksize/4, blocksize/4*sizeof(float));

  1598.     }

  1599. 

  1600.     vc->previous_window = blockflag;

  1601.     return retlen;

  1602. }

  1603. 

  1604. // Return the decoded audio packet through the standard api

  1605. 

  1606. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1607.                         void *data, int *data_size,

  1608.                         AVPacket *avpkt)

  1609. {

  1610.     const uint8_t *buf = avpkt->data;

  1611.     int buf_size = avpkt->size;

  1612.     vorbis_context *vc = avccontext->priv_data ;

  1613.     GetBitContext *gb = &(vc->gb);

  1614.     const float *channel_ptrs[vc->audio_channels];

  1615.     int i;

  1616. 

  1617.     int_fast16_t len;

  1618. 

  1619.     if(!buf_size){

  1620.         return 0;

  1621.     }

  1622. 

  1623.     AV_DEBUG("packet length %d \n", buf_size);

  1624. 

  1625.     init_get_bits(gb, buf, buf_size*8);

  1626. 

  1627.     len=vorbis_parse_audio_packet(vc);

  1628. 

  1629.     if (len<=0) {

  1630.         *data_size=0;

  1631.         return buf_size;

  1632.     }

  1633. 

  1634.     if (!vc->first_frame) {

  1635.         vc->first_frame=1;

  1636.         *data_size=0;

  1637.         return buf_size ;

  1638.     }

  1639. 

  1640.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1641. 

  1642.     for(i=0; i<vc->audio_channels; i++)

  1643.         channel_ptrs[i] = vc->channel_floors+i*len;

  1644.     vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);

  1645.     *data_size=len*2*vc->audio_channels;

  1646. 

  1647.     return buf_size ;

  1648. }

  1649. 

  1650. // Close decoder

  1651. 

  1652. static av_cold int vorbis_decode_close(AVCodecContext *avccontext) {

  1653.     vorbis_context *vc = avccontext->priv_data;

  1654. 

  1655.     vorbis_free(vc);

  1656. 

  1657.     return 0 ;

  1658. }

  1659. 

  1660. AVCodec vorbis_decoder = {

  1661.     "vorbis",

  1662.     CODEC_TYPE_AUDIO,

  1663.     CODEC_ID_VORBIS,

  1664.     sizeof(vorbis_context),

  1665.     vorbis_decode_init,

  1666.     NULL,

  1667.     vorbis_decode_close,

  1668.     vorbis_decode_frame,

  1669.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1670. };