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FFmpeg/libavcodec/vorbis.c

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  1. /**

  2.  * @file vorbis.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. 

  24. #undef V_DEBUG

  25. //#define V_DEBUG

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

  27. 

  28. #include <math.h>

  29. 

  30. #define ALT_BITSTREAM_READER_LE

  31. #include "avcodec.h"

  32. #include "bitstream.h"

  33. #include "dsputil.h"

  34. 

  35. #include "vorbis.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.             floor1_entry_t * 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.     float *channel_residues;

  153.     float *channel_floors;

  154.     float *saved;

  155.     uint_fast16_t saved_start;

  156.     float *ret;

  157.     float *buf;

  158.     float *buf_tmp;

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

  160.     uint_fast32_t exp_bias;

  161. } vorbis_context;

  162. 

  163. /* Helper functions */

  164. 

  165. #define BARK(x) \

  166.     (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))

  167. 

  168. unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n) {   // x^(1/n)

  169.     unsigned int ret=0, i, j;

  170. 

  171.     do {

  172.         ++ret;

  173.         for(i=0,j=ret;i<n-1;i++) j*=ret;

  174.     } while (j<=x);

  175. 

  176.     return (ret-1);

  177. }

  178. 

  179. static float vorbisfloat2float(uint_fast32_t val) {

  180.     double mant=val&0x1fffff;

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

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

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

  184. }

  185. 

  186. 

  187. // Generate vlc codes from vorbis huffman code lengths

  188. 

  189. int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, uint_fast32_t num) {

  190.     uint_fast32_t exit_at_level[33]={404,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

  191.         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

  192. 

  193.     uint_fast8_t i,j;

  194.     uint_fast32_t code,p;

  195. 

  196. #ifdef V_DEBUG

  197.     GetBitContext gb;

  198. #endif

  199. 

  200.     for(p=0;(bits[p]==0) && (p<num);++p);

  201.     if (p==num) {

  202. //        av_log(vc->avccontext, AV_LOG_INFO, "An empty codebook. Heh?! \n");

  203.         return 0;

  204.     }

  205. 

  206.     codes[p]=0;

  207.     for(i=0;i<bits[p];++i) {

  208.         exit_at_level[i+1]=1<<i;

  209.     }

  210. 

  211. #ifdef V_DEBUG

  212.     av_log(NULL, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);

  213.     init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);

  214.     for(i=0;i<bits[p];++i) {

  215.         av_log(NULL, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");

  216.     }

  217.     av_log(NULL, AV_LOG_INFO, "\n");

  218. #endif

  219. 

  220.     ++p;

  221. 

  222.     for(;p<num;++p) {

  223.         if (bits[p]==0) continue;

  224.         // find corresponding exit(node which the tree can grow further from)

  225.         for(i=bits[p];i>0;--i) {

  226.             if (exit_at_level[i]) break;

  227.         }

  228.         if (!i) return 1; // overspecified tree

  229.         code=exit_at_level[i];

  230.         exit_at_level[i]=0;

  231.         // construct code (append 0s to end) and introduce new exits

  232.         for(j=i+1;j<=bits[p];++j) {

  233.             exit_at_level[j]=code+(1<<(j-1));

  234.         }

  235.         codes[p]=code;

  236. 

  237. #ifdef V_DEBUG

  238.         av_log(NULL, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);

  239.         init_get_bits(&gb, (uint_fast8_t *)&codes[p], bits[p]);

  240.         for(i=0;i<bits[p];++i) {

  241.             av_log(NULL, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");

  242.         }

  243.         av_log(NULL, AV_LOG_INFO, "\n");

  244. #endif

  245. 

  246.     }

  247. 

  248.     //no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)

  249.     for (p=1; p<33; p++)

  250.         if (exit_at_level[p]) return 1;

  251. 

  252.     return 0;

  253. }

  254. 

  255. void ff_vorbis_ready_floor1_list(floor1_entry_t * list, int values) {

  256.     int i;

  257.     list[0].sort = 0;

  258.     list[1].sort = 1;

  259.     for (i = 2; i < values; i++) {

  260.         int j;

  261.         list[i].low = 0;

  262.         list[i].high = 1;

  263.         list[i].sort = i;

  264.         for (j = 2; j < i; j++) {

  265.             int tmp = list[j].x;

  266.             if (tmp < list[i].x) {

  267.                 if (tmp > list[list[i].low].x) list[i].low = j;

  268.             } else {

  269.                 if (tmp < list[list[i].high].x) list[i].high = j;

  270.             }

  271.         }

  272.     }

  273.     for (i = 0; i < values - 1; i++) {

  274.         int j;

  275.         for (j = i + 1; j < values; j++) {

  276.             if (list[list[i].sort].x > list[list[j].sort].x) {

  277.                 int tmp = list[i].sort;

  278.                 list[i].sort = list[j].sort;

  279.                 list[j].sort = tmp;

  280.             }

  281.         }

  282.     }

  283. }

  284. 

  285. // Free all allocated memory -----------------------------------------

  286. 

  287. static void vorbis_free(vorbis_context *vc) {

  288.     int_fast16_t i;

  289. 

  290.     av_freep(&vc->channel_residues);

  291.     av_freep(&vc->channel_floors);

  292.     av_freep(&vc->saved);

  293.     av_freep(&vc->ret);

  294.     av_freep(&vc->buf);

  295.     av_freep(&vc->buf_tmp);

  296. 

  297.     av_freep(&vc->residues);

  298.     av_freep(&vc->modes);

  299. 

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

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

  302. 

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

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

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

  306.     }

  307.     av_freep(&vc->codebooks);

  308. 

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

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

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

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

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

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

  315.         }

  316.         else {

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

  318.         }

  319.     }

  320.     av_freep(&vc->floors);

  321. 

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

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

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

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

  326.     }

  327.     av_freep(&vc->mappings);

  328. 

  329.     if(vc->exp_bias){

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

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

  332.     }

  333. }

  334. 

  335. // Parse setup header -------------------------------------------------

  336. 

  337. // Process codebooks part

  338. 

  339. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {

  340.     uint_fast16_t cb;

  341.     uint8_t *tmp_vlc_bits;

  342.     uint32_t *tmp_vlc_codes;

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

  344. 

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

  346. 

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

  348. 

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

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

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

  352. 

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

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

  355.         uint_fast8_t ordered;

  356.         uint_fast32_t t, used_entries=0;

  357.         uint_fast32_t entries;

  358. 

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

  360. 

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

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

  363.             goto error;

  364.         }

  365. 

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

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

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

  369.             goto error;

  370.         }

  371.         entries=get_bits(gb, 24);

  372.         if (entries>V_MAX_VLCS) {

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

  374.             goto error;

  375.         }

  376. 

  377.         ordered=get_bits1(gb);

  378. 

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

  380. 

  381.         if (!ordered) {

  382.             uint_fast16_t ce;

  383.             uint_fast8_t flag;

  384.             uint_fast8_t sparse=get_bits1(gb);

  385. 

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

  387. 

  388.             if (sparse) {

  389.                 AV_DEBUG(" sparse \n");

  390. 

  391.                 used_entries=0;

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

  393.                     flag=get_bits1(gb);

  394.                     if (flag) {

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

  396.                         ++used_entries;

  397.                     }

  398.                     else tmp_vlc_bits[ce]=0;

  399.                 }

  400.             } else {

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

  402. 

  403.                 used_entries=entries;

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

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

  406.                 }

  407.             }

  408.         } else {

  409.             uint_fast16_t current_entry=0;

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

  411. 

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

  413. 

  414.             used_entries=entries;

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

  416.                 uint_fast16_t i, number;

  417. 

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

  419. 

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

  421. 

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

  423. 

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

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

  426.                 }

  427. 

  428.                 current_entry+=number;

  429.             }

  430.             if (current_entry>used_entries) {

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

  432.                 goto error;

  433.             }

  434.         }

  435. 

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

  437. 

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

  439. 

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

  441. 

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

  443.             uint_fast16_t i, j, k;

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

  445.             uint_fast16_t codebook_multiplicands[codebook_lookup_values];

  446. 

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

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

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

  450.             uint_fast8_t codebook_sequence_p=get_bits1(gb);

  451. 

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

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

  454. 

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

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

  457. 

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

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

  460.             }

  461. 

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

  463.             codebook_setup->codevectors=(float *)av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float));

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

  465.                 uint_fast8_t dim=codebook_setup->dimensions;

  466. 

  467.                 if (tmp_vlc_bits[i]) {

  468.                     float last=0.0;

  469.                     uint_fast32_t lookup_offset=i;

  470. 

  471. #ifdef V_DEBUG

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

  473. #endif

  474. 

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

  476.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  478.                         if (codebook_sequence_p) {

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

  480.                         }

  481.                         lookup_offset/=codebook_lookup_values;

  482.                     }

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

  484. 

  485. #ifdef V_DEBUG

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

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

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

  489.                     }

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

  491. #endif

  492. 

  493.                     ++j;

  494.                 }

  495.             }

  496.             if (j!=used_entries) {

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

  498.                 goto error;

  499.             }

  500.             entries=used_entries;

  501.         }

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

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

  504.             goto error;

  505.         }

  506. 

  507. // Initialize VLC table

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

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

  510.             goto error;

  511.         }

  512.         codebook_setup->maxdepth=0;

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

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

  515. 

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

  517.         else                                       codebook_setup->nb_bits=V_NB_BITS;

  518. 

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

  520. 

  521.         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)) {

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

  523.             goto error;

  524.         }

  525.     }

  526. 

  527.     av_free(tmp_vlc_bits);

  528.     av_free(tmp_vlc_codes);

  529.     return 0;

  530. 

  531. // Error:

  532. error:

  533.     av_free(tmp_vlc_bits);

  534.     av_free(tmp_vlc_codes);

  535.     return 1;

  536. }

  537. 

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

  539. 

  540. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {

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

  542.     uint_fast8_t i;

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

  544. 

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

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

  547. 

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

  549. 

  550.         if (vorbis_tdtransform) {

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

  552.             return 1;

  553.         }

  554.     }

  555.     return 0;

  556. }

  557. 

  558. // Process floors part

  559. 

  560. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  561.                                          vorbis_floor_data *vfu, float *vec);

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

  563. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  564.                                          vorbis_floor_data *vfu, float *vec);

  565. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {

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

  567.     uint_fast16_t i,j,k;

  568. 

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

  570. 

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

  572. 

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

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

  575. 

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

  577. 

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

  579. 

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

  581.             uint_fast8_t maximum_class=0;

  582.             uint_fast8_t rangebits;

  583.             uint_fast16_t floor1_values=2;

  584. 

  585.             floor_setup->decode=vorbis_floor1_decode;

  586. 

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

  588. 

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

  590. 

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

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

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

  594. 

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

  596. 

  597.             }

  598. 

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

  600. 

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

  602. 

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

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

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

  606. 

  607.                 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]);

  608. 

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

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

  611. 

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

  613.                 }

  614. 

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

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

  617. 

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

  619.                 }

  620.             }

  621. 

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

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

  624. 

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

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

  627.             }

  628. 

  629.             floor_setup->data.t1.list=(floor1_entry_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(floor1_entry_t));

  630. 

  631. 

  632.             rangebits=get_bits(gb, 4);

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

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

  635. 

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

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

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

  639. 

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

  641.                 }

  642.             }

  643. 

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

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

  646.         }

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

  648.             uint_fast8_t max_codebook_dim=0;

  649. 

  650.             floor_setup->decode=vorbis_floor0_decode;

  651. 

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

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

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

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

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

  657.              * 2^0 - 1 == 0                             */

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

  659.               av_log(vc->avccontext, AV_LOG_ERROR,

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

  661.               return 1;

  662.             }

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

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

  665. 

  666.             /* allocate mem for booklist */

  667.             floor_setup->data.t0.book_list=

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

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

  670.             /* read book indexes */

  671.             {

  672.                 int idx;

  673.                 uint_fast8_t book_idx;

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

  675.                     book_idx=get_bits(gb, 8);

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

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

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

  679. 

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

  681.                         return 1;

  682.                 }

  683.             }

  684. 

  685.             create_map( vc, i );

  686. 

  687.             /* allocate mem for lsp coefficients */

  688.             {

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

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

  691.                 floor_setup->data.t0.lsp=

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

  693.                               * sizeof(float));

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

  695.             }

  696. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  710.             {

  711.               int idx;

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

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

  714.                   idx+1,

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

  716.               }

  717.             }

  718. #endif

  719.         }

  720.         else {

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

  722.             return 1;

  723.         }

  724.     }

  725.     return 0;

  726. }

  727. 

  728. // Process residues part

  729. 

  730. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){

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

  732.     uint_fast8_t i, j, k;

  733. 

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

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

  736. 

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

  738. 

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

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

  741.         uint_fast8_t cascade[64];

  742.         uint_fast8_t high_bits;

  743.         uint_fast8_t low_bits;

  744. 

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

  746. 

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

  748. 

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

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

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

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

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

  754. 

  755.         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,

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

  757. 

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

  759.             high_bits=0;

  760.             low_bits=get_bits(gb, 3);

  761.             if (get_bits1(gb)) {

  762.                 high_bits=get_bits(gb, 5);

  763.             }

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

  765. 

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

  767.         }

  768. 

  769.         res_setup->maxpass=0;

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

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

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

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

  774. 

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

  776. 

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

  778.                         res_setup->maxpass=k;

  779.                     }

  780.                 } else {

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

  782.                 }

  783.             }

  784.         }

  785.     }

  786.     return 0;

  787. }

  788. 

  789. // Process mappings part

  790. 

  791. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {

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

  793.     uint_fast8_t i, j;

  794. 

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

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

  797. 

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

  799. 

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

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

  802. 

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

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

  805.             return 1;

  806.         }

  807.         if (get_bits1(gb)) {

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

  809.         } else {

  810.             mapping_setup->submaps=1;

  811.         }

  812. 

  813.         if (get_bits1(gb)) {

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

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

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

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

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

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

  820.                 // FIXME: sanity checks

  821.             }

  822.         } else {

  823.             mapping_setup->coupling_steps=0;

  824.         }

  825. 

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

  827. 

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

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

  830.             return 1; // following spec.

  831.         }

  832. 

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

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

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

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

  837.             }

  838.         }

  839. 

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

  841.             get_bits(gb, 8); // FIXME check?

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

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

  844. 

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

  846.         }

  847.     }

  848.     return 0;

  849. }

  850. 

  851. // Process modes part

  852. 

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

  854. {

  855.     vorbis_floor * floors=vc->floors;

  856.     vorbis_floor0 * vf;

  857.     int idx;

  858.     int_fast8_t blockflag;

  859.     int_fast32_t * map;

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

  861. 

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

  863.     {

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

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

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

  867. 

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

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

  870. 

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

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

  873.                               ((vf->bark_map_size)/

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

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

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

  877.         }

  878.     }

  879.     map[n]=-1;

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

  881.     }

  882. 

  883. #   ifdef V_DEBUG

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

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

  886.                  idx, map[idx]);

  887.     }

  888. #   endif

  889. }

  890. 

  891. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {

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

  893.     uint_fast8_t i;

  894. 

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

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

  897. 

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

  899. 

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

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

  902. 

  903.         mode_setup->blockflag=get_bits(gb, 1);

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

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

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

  907. 

  908.         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);

  909.     }

  910.     return 0;

  911. }

  912. 

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

  914. 

  915. static int vorbis_parse_setup_hdr(vorbis_context *vc) {

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

  917. 

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

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

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

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

  922.         return 1;

  923.     }

  924. 

  925.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  927.         return 2;

  928.     }

  929.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  931.         return 3;

  932.     }

  933.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  935.         return 4;

  936.     }

  937.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  939.         return 5;

  940.     }

  941.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  943.         return 6;

  944.     }

  945.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  947.         return 7;

  948.     }

  949.     if (!get_bits1(gb)) {

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

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

  952.     }

  953. 

  954.     return 0;

  955. }

  956. 

  957. // Process the identification header

  958. 

  959. static int vorbis_parse_id_hdr(vorbis_context *vc){

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

  961.     uint_fast8_t bl0, bl1;

  962. 

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

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

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

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

  967.         return 1;

  968.     }

  969. 

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

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

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

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

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

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

  976.     bl0=get_bits(gb, 4);

  977.     bl1=get_bits(gb, 4);

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

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

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

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

  982.         return 3;

  983.     }

  984.     // output format int16

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

  986.                                              AVCODEC_MAX_AUDIO_FRAME_SIZE) {

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

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

  989.         return 4;

  990.     }

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

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

  993. 

  994.     if(vc->exp_bias){

  995.         int i, j;

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

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

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

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

  1000.             vc->win[j] = win;

  1001.         }

  1002.     }

  1003. 

  1004.     if ((get_bits1(gb)) == 0) {

  1005.         av_log(vc->avccontext, AV_LOG_ERROR, " Vorbis id header packet corrupt (framing flag not set). \n");

  1006.         return 2;

  1007.     }

  1008. 

  1009.     vc->channel_residues=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));

  1010.     vc->channel_floors=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));

  1011.     vc->saved=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));

  1012.     vc->ret=(float *)av_malloc((vc->blocksize[1]/2)*vc->audio_channels * sizeof(float));

  1013.     vc->buf=(float *)av_malloc(vc->blocksize[1] * sizeof(float));

  1014.     vc->buf_tmp=(float *)av_malloc(vc->blocksize[1] * sizeof(float));

  1015.     vc->saved_start=0;

  1016. 

  1017.     ff_mdct_init(&vc->mdct[0], bl0, 1);

  1018.     ff_mdct_init(&vc->mdct[1], bl1, 1);

  1019. 

  1020.     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 ",

  1021.             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);

  1022. 

  1023. /*

  1024.     BLK=vc->blocksize[0];

  1025.     for(i=0;i<BLK/2;++i) {

  1026.         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)));

  1027.     }

  1028. */

  1029. 

  1030.     return 0;

  1031. }

  1032. 

  1033. // Process the extradata using the functions above (identification header, setup header)

  1034. 

  1035. static int vorbis_decode_init(AVCodecContext *avccontext) {

  1036.     vorbis_context *vc = avccontext->priv_data ;

  1037.     uint8_t *headers = avccontext->extradata;

  1038.     int headers_len=avccontext->extradata_size;

  1039.     uint8_t *header_start[3];

  1040.     int header_len[3];

  1041.     GetBitContext *gb = &(vc->gb);

  1042.     int i, j, hdr_type;

  1043. 

  1044.     vc->avccontext = avccontext;

  1045.     dsputil_init(&vc->dsp, avccontext);

  1046. 

  1047.     if(vc->dsp.float_to_int16 == ff_float_to_int16_c) {

  1048.         vc->add_bias = 385;

  1049.         vc->exp_bias = 0;

  1050.     } else {

  1051.         vc->add_bias = 0;

  1052.         vc->exp_bias = 15<<23;

  1053.     }

  1054. 

  1055.     if (!headers_len) {

  1056.         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");

  1057.         return -1;

  1058.     }

  1059. 

  1060.     if(headers[0] == 0 && headers[1] == 30) {

  1061.         for(i = 0; i < 3; i++){

  1062.             header_len[i] = *headers++ << 8;

  1063.             header_len[i] += *headers++;

  1064.             header_start[i] = headers;

  1065.             headers += header_len[i];

  1066.         }

  1067.     } else if(headers[0] == 2) {

  1068.         for(j=1,i=0;i<2;++i, ++j) {

  1069.             header_len[i]=0;

  1070.             while(j<headers_len && headers[j]==0xff) {

  1071.                 header_len[i]+=0xff;

  1072.                 ++j;

  1073.             }

  1074.             if (j>=headers_len) {

  1075.                 av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");

  1076.                 return -1;

  1077.             }

  1078.             header_len[i]+=headers[j];

  1079.         }

  1080.         header_len[2]=headers_len-header_len[0]-header_len[1]-j;

  1081.         headers+=j;

  1082.         header_start[0] = headers;

  1083.         header_start[1] = header_start[0] + header_len[0];

  1084.         header_start[2] = header_start[1] + header_len[1];

  1085.     } else {

  1086.         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");

  1087.         return -1;

  1088.     }

  1089. 

  1090.     init_get_bits(gb, header_start[0], header_len[0]*8);

  1091.     hdr_type=get_bits(gb, 8);

  1092.     if (hdr_type!=1) {

  1093.         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");

  1094.         return -1;

  1095.     }

  1096.     if (vorbis_parse_id_hdr(vc)) {

  1097.         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");

  1098.         vorbis_free(vc);

  1099.         return -1;

  1100.     }

  1101. 

  1102.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1103.     hdr_type=get_bits(gb, 8);

  1104.     if (hdr_type!=5) {

  1105.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1106.         return -1;

  1107.     }

  1108.     if (vorbis_parse_setup_hdr(vc)) {

  1109.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1110.         vorbis_free(vc);

  1111.         return -1;

  1112.     }

  1113. 

  1114.     avccontext->channels = vc->audio_channels;

  1115.     avccontext->sample_rate = vc->audio_samplerate;

  1116. 

  1117.     return 0 ;

  1118. }

  1119. 

  1120. // Decode audiopackets -------------------------------------------------

  1121. 

  1122. // Read and decode floor

  1123. 

  1124. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  1125.                                          vorbis_floor_data *vfu, float *vec) {

  1126.     vorbis_floor0 * vf=&vfu->t0;

  1127.     float * lsp=vf->lsp;

  1128.     uint_fast32_t amplitude;

  1129.     uint_fast32_t book_idx;

  1130.     uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;

  1131. 

  1132.     amplitude=get_bits(&vc->gb, vf->amplitude_bits);

  1133.     if (amplitude>0) {

  1134.         float last = 0;

  1135.         uint_fast16_t lsp_len = 0;

  1136.         uint_fast16_t idx;

  1137.         vorbis_codebook codebook;

  1138. 

  1139.         book_idx=get_bits(&vc->gb, ilog(vf->num_books));

  1140.         if ( book_idx >= vf->num_books ) {

  1141.             av_log( vc->avccontext, AV_LOG_ERROR,

  1142.                     "floor0 dec: booknumber too high!\n" );

  1143.             //FIXME: look above

  1144.         }

  1145.         AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );

  1146.         codebook=vc->codebooks[vf->book_list[book_idx]];

  1147. 

  1148.         while (lsp_len<vf->order) {

  1149.             int vec_off;

  1150. 

  1151.             AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );

  1152.             AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );

  1153.             /* read temp vector */

  1154.             vec_off=get_vlc2(&vc->gb,

  1155.                              codebook.vlc.table,

  1156.                              codebook.nb_bits,

  1157.                              codebook.maxdepth ) *

  1158.                              codebook.dimensions;

  1159.             AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );

  1160.             /* copy each vector component and add last to it */

  1161.             for (idx=0; idx<codebook.dimensions; ++idx) {

  1162.                 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;

  1163.             }

  1164.             last=lsp[lsp_len+idx-1]; /* set last to last vector component */

  1165. 

  1166.             lsp_len += codebook.dimensions;

  1167.         }

  1168. #ifdef V_DEBUG

  1169.         /* DEBUG: output lsp coeffs */

  1170.         {

  1171.             int idx;

  1172.             for ( idx = 0; idx < lsp_len; ++idx )

  1173.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );

  1174.         }

  1175. #endif

  1176. 

  1177.         /* synthesize floor output vector */

  1178.         {

  1179.             int i;

  1180.             int order=vf->order;

  1181.             float wstep=M_PI/vf->bark_map_size;

  1182. 

  1183.             for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }

  1184. 

  1185.             AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",

  1186.                      vf->map_size, order, wstep);

  1187. 

  1188.             i=0;

  1189.             while(i<vf->map_size[blockflag]) {

  1190.                 int j, iter_cond=vf->map[blockflag][i];

  1191.                 float p=0.5f;

  1192.                 float q=0.5f;

  1193.                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times

  1194. 

  1195.                 /* similar part for the q and p products */

  1196.                 for(j=0;j<order;j+=2) {

  1197.                     q *= lsp[j]  -two_cos_w;

  1198.                     p *= lsp[j+1]-two_cos_w;

  1199.                 }

  1200.                 if(j==order) { // even order

  1201.                     p *= p*(2.0f-two_cos_w);

  1202.                     q *= q*(2.0f+two_cos_w);

  1203.                 }

  1204.                 else { // odd order

  1205.                     q *= two_cos_w-lsp[j]; // one more time for q

  1206. 

  1207.                     /* final step and square */

  1208.                     p *= p*(4.f-two_cos_w*two_cos_w);

  1209.                     q *= q;

  1210.                 }

  1211. 

  1212.                 /* calculate linear floor value */

  1213.                 {

  1214.                     q=exp( (

  1215.                              ( (amplitude*vf->amplitude_offset)/

  1216.                                (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )

  1217.                              - vf->amplitude_offset ) * .11512925f

  1218.                          );

  1219.                 }

  1220. 

  1221.                 /* fill vector */

  1222.                 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);

  1223.             }

  1224.         }

  1225.     }

  1226.     else {

  1227.         /* this channel is unused */

  1228.         return 1;

  1229.     }

  1230. 

  1231.     AV_DEBUG(" Floor0 decoded\n");

  1232. 

  1233.     return 0;

  1234. }

  1235. 

  1236. static void render_line(int x0, int y0, int x1, int y1, float * buf, int n) {

  1237.     int dy = y1 - y0;

  1238.     int adx = x1 - x0;

  1239.     int ady = FFABS(dy);

  1240.     int base = dy / adx;

  1241.     int x = x0;

  1242.     int y = y0;

  1243.     int err = 0;

  1244.     int sy;

  1245.     if (dy < 0) sy = base - 1;

  1246.     else        sy = base + 1;

  1247.     ady = ady - FFABS(base) * adx;

  1248.     if (x >= n) return;

  1249.     buf[x] = ff_vorbis_floor1_inverse_db_table[y];

  1250.     for (x = x0 + 1; x < x1; x++) {

  1251.         if (x >= n) return;

  1252.         err += ady;

  1253.         if (err >= adx) {

  1254.             err -= adx;

  1255.             y += sy;

  1256.         } else {

  1257.             y += base;

  1258.         }

  1259.         buf[x] = ff_vorbis_floor1_inverse_db_table[y];

  1260.     }

  1261. }

  1262. 

  1263. void ff_vorbis_floor1_render_list(floor1_entry_t * list, int values, uint_fast16_t * y_list, int * flag, int multiplier, float * out, int samples) {

  1264.     int lx, ly, i;

  1265.     lx = 0;

  1266.     ly = y_list[0] * multiplier;

  1267.     for (i = 1; i < values; i++) {

  1268.         int pos = list[i].sort;

  1269.         if (flag[pos]) {

  1270.             render_line(lx, ly, list[pos].x, y_list[pos] * multiplier, out, samples);

  1271.             lx = list[pos].x;

  1272.             ly = y_list[pos] * multiplier;

  1273.         }

  1274.         if (lx >= samples) break;

  1275.     }

  1276.     if (lx < samples) render_line(lx, ly, samples, ly, out, samples);

  1277. }

  1278. 

  1279. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {

  1280.     vorbis_floor1 * vf=&vfu->t1;

  1281.     GetBitContext *gb=&vc->gb;

  1282.     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };

  1283.     uint_fast16_t range=range_v[vf->multiplier-1];

  1284.     uint_fast16_t floor1_Y[vf->x_list_dim];

  1285.     uint_fast16_t floor1_Y_final[vf->x_list_dim];

  1286.     int floor1_flag[vf->x_list_dim];

  1287.     uint_fast8_t class_;

  1288.     uint_fast8_t cdim;

  1289.     uint_fast8_t cbits;

  1290.     uint_fast8_t csub;

  1291.     uint_fast8_t cval;

  1292.     int_fast16_t book;

  1293.     uint_fast16_t offset;

  1294.     uint_fast16_t i,j;

  1295.     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?

  1296.     int_fast16_t dy, err;

  1297. 

  1298. 

  1299.     if (!get_bits1(gb)) return 1; // silence

  1300. 

  1301. // Read values (or differences) for the floor's points

  1302. 

  1303.     floor1_Y[0]=get_bits(gb, ilog(range-1));

  1304.     floor1_Y[1]=get_bits(gb, ilog(range-1));

  1305. 

  1306.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1307. 

  1308.     offset=2;

  1309.     for(i=0;i<vf->partitions;++i) {

  1310.         class_=vf->partition_class[i];

  1311.         cdim=vf->class_dimensions[class_];

  1312.         cbits=vf->class_subclasses[class_];

  1313.         csub=(1<<cbits)-1;

  1314.         cval=0;

  1315. 

  1316.         AV_DEBUG("Cbits %d \n", cbits);

  1317. 

  1318.         if (cbits) { // this reads all subclasses for this partition's class

  1319.             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,

  1320.             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);

  1321.         }

  1322. 

  1323.         for(j=0;j<cdim;++j) {

  1324.             book=vf->subclass_books[class_][cval & csub];

  1325. 

  1326.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1327. 

  1328.             cval=cval>>cbits;

  1329.             if (book>-1) {

  1330.                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,

  1331.                 vc->codebooks[book].nb_bits, 3);

  1332.             } else {

  1333.                 floor1_Y[offset+j]=0;

  1334.             }

  1335. 

  1336.             AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);

  1337.         }

  1338.         offset+=cdim;

  1339.     }

  1340. 

  1341. // Amplitude calculation from the differences

  1342. 

  1343.     floor1_flag[0]=1;

  1344.     floor1_flag[1]=1;

  1345.     floor1_Y_final[0]=floor1_Y[0];

  1346.     floor1_Y_final[1]=floor1_Y[1];

  1347. 

  1348.     for(i=2;i<vf->x_list_dim;++i) {

  1349.         uint_fast16_t val, highroom, lowroom, room;

  1350.         uint_fast16_t high_neigh_offs;

  1351.         uint_fast16_t low_neigh_offs;

  1352. 

  1353.         low_neigh_offs=vf->list[i].low;

  1354.         high_neigh_offs=vf->list[i].high;

  1355.         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin

  1356.         adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;

  1357.         ady= FFABS(dy);

  1358.         err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);

  1359.         off=(int16_t)err/(int16_t)adx;

  1360.         if (dy<0) {

  1361.             predicted=floor1_Y_final[low_neigh_offs]-off;

  1362.         } else {

  1363.             predicted=floor1_Y_final[low_neigh_offs]+off;

  1364.         } // render_point end

  1365. 

  1366.         val=floor1_Y[i];

  1367.         highroom=range-predicted;

  1368.         lowroom=predicted;

  1369.         if (highroom < lowroom) {

  1370.             room=highroom*2;

  1371.         } else {

  1372.             room=lowroom*2;   // SPEC mispelling

  1373.         }

  1374.         if (val) {

  1375.             floor1_flag[low_neigh_offs]=1;

  1376.             floor1_flag[high_neigh_offs]=1;

  1377.             floor1_flag[i]=1;

  1378.             if (val>=room) {

  1379.                 if (highroom > lowroom) {

  1380.                     floor1_Y_final[i]=val-lowroom+predicted;

  1381.                 } else {

  1382.                     floor1_Y_final[i]=predicted-val+highroom-1;

  1383.                 }

  1384.             } else {

  1385.                 if (val & 1) {

  1386.                     floor1_Y_final[i]=predicted-(val+1)/2;

  1387.                 } else {

  1388.                     floor1_Y_final[i]=predicted+val/2;

  1389.                 }

  1390.             }

  1391.         } else {

  1392.             floor1_flag[i]=0;

  1393.             floor1_Y_final[i]=predicted;

  1394.         }

  1395. 

  1396.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);

  1397.     }

  1398. 

  1399. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1400. 

  1401.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1402. 

  1403.     AV_DEBUG(" Floor decoded\n");

  1404. 

  1405.     return 0;

  1406. }

  1407. 

  1408. // Read and decode residue

  1409. 

  1410. static 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) {

  1411.     GetBitContext *gb=&vc->gb;

  1412.     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;

  1413.     uint_fast16_t n_to_read=vr->end-vr->begin;

  1414.     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;

  1415.     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];

  1416.     uint_fast8_t pass;

  1417.     uint_fast8_t ch_used;

  1418.     uint_fast8_t i,j,l;

  1419.     uint_fast16_t k;

  1420. 

  1421.     if (vr->type==2) {

  1422.         for(j=1;j<ch;++j) {

  1423.                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input

  1424.         }

  1425.         if (do_not_decode[0]) return 0;

  1426.         ch_used=1;

  1427.     } else {

  1428.         ch_used=ch;

  1429.     }

  1430. 

  1431.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1432. 

  1433.     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?

  1434.         uint_fast16_t voffset;

  1435.         uint_fast16_t partition_count;

  1436.         uint_fast16_t j_times_ptns_to_read;

  1437. 

  1438.         voffset=vr->begin;

  1439.         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error

  1440.             if (!pass) {

  1441.                 uint_fast32_t inverse_class = ff_inverse[vr->classifications];

  1442.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1443.                     if (!do_not_decode[j]) {

  1444.                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1445.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1446. 

  1447.                         AV_DEBUG("Classword: %d \n", temp);

  1448. 

  1449.                         assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]

  1450.                         for(i=0;i<c_p_c;++i) {

  1451.                             uint_fast32_t temp2;

  1452. 

  1453.                             temp2=(((uint_fast64_t)temp) * inverse_class)>>32;

  1454.                             if (partition_count+c_p_c-1-i < ptns_to_read) {

  1455.                                 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;

  1456.                             }

  1457.                             temp=temp2;

  1458.                         }

  1459.                     }

  1460.                     j_times_ptns_to_read+=ptns_to_read;

  1461.                 }

  1462.             }

  1463.             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {

  1464.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1465.                     uint_fast16_t voffs;

  1466. 

  1467.                     if (!do_not_decode[j]) {

  1468.                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];

  1469.                         int_fast16_t vqbook=vr->books[vqclass][pass];

  1470. 

  1471.                         if (vqbook>=0) {

  1472.                             uint_fast16_t coffs;

  1473.                             unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64

  1474.                             uint_fast16_t step= dim==1 ? vr->partition_size

  1475.                                               : FASTDIV(vr->partition_size, dim);

  1476.                             vorbis_codebook codebook= vc->codebooks[vqbook];

  1477. 

  1478.                             if (vr->type==0) {

  1479. 

  1480.                                 voffs=voffset+j*vlen;

  1481.                                 for(k=0;k<step;++k) {

  1482.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1483.                                     for(l=0;l<dim;++l) {

  1484.                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH

  1485.                                     }

  1486.                                 }

  1487.                             }

  1488.                             else if (vr->type==1) {

  1489.                                 voffs=voffset+j*vlen;

  1490.                                 for(k=0;k<step;++k) {

  1491.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1492.                                     for(l=0;l<dim;++l, ++voffs) {

  1493.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1494. 

  1495.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1496.                                     }

  1497.                                 }

  1498.                             }

  1499.                             else if (vr->type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized

  1500.                                 voffs=voffset>>1;

  1501. 

  1502.                                 if(dim==2) {

  1503.                                     for(k=0;k<step;++k) {

  1504.                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1505.                                         vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH

  1506.                                         vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH

  1507.                                     }

  1508.                                 } else

  1509.                                 for(k=0;k<step;++k) {

  1510.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1511.                                     for(l=0;l<dim;l+=2, voffs++) {

  1512.                                         vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH

  1513.                                         vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH

  1514. 

  1515.                                         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);

  1516.                                     }

  1517.                                 }

  1518. 

  1519.                             }

  1520.                             else if (vr->type==2) {

  1521.                                 voffs=voffset;

  1522. 

  1523.                                 for(k=0;k<step;++k) {

  1524.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1525.                                     for(l=0;l<dim;++l, ++voffs) {

  1526.                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %

  1527. 

  1528.                                         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);

  1529.                                     }

  1530.                                 }

  1531.                             } else {

  1532.                                 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1533.                                 return 1;

  1534.                             }

  1535.                         }

  1536.                     }

  1537.                     j_times_ptns_to_read+=ptns_to_read;

  1538.                 }

  1539.                 ++partition_count;

  1540.                 voffset+=vr->partition_size;

  1541.             }

  1542.         }

  1543.     }

  1544.     return 0;

  1545. }

  1546. 

  1547. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1548. {

  1549.     int i;

  1550.     for(i=0; i<blocksize; i++)

  1551.     {

  1552.         if (mag[i]>0.0) {

  1553.             if (ang[i]>0.0) {

  1554.                 ang[i]=mag[i]-ang[i];

  1555.             } else {

  1556.                 float temp=ang[i];

  1557.                 ang[i]=mag[i];

  1558.                 mag[i]+=temp;

  1559.             }

  1560.         } else {

  1561.             if (ang[i]>0.0) {

  1562.                 ang[i]+=mag[i];

  1563.             } else {

  1564.                 float temp=ang[i];

  1565.                 ang[i]=mag[i];

  1566.                 mag[i]-=temp;

  1567.             }

  1568.         }

  1569.     }

  1570. }

  1571. 

  1572. // Decode the audio packet using the functions above

  1573. 

  1574. static int vorbis_parse_audio_packet(vorbis_context *vc) {

  1575.     GetBitContext *gb=&vc->gb;

  1576. 

  1577.     uint_fast8_t previous_window=0,next_window=0;

  1578.     uint_fast8_t mode_number;

  1579.     uint_fast16_t blocksize;

  1580.     int_fast32_t i,j;

  1581.     uint_fast8_t no_residue[vc->audio_channels];

  1582.     uint_fast8_t do_not_decode[vc->audio_channels];

  1583.     vorbis_mapping *mapping;

  1584.     float *ch_res_ptr=vc->channel_residues;

  1585.     float *ch_floor_ptr=vc->channel_floors;

  1586.     uint_fast8_t res_chan[vc->audio_channels];

  1587.     uint_fast8_t res_num=0;

  1588.     int_fast16_t retlen=0;

  1589.     uint_fast16_t saved_start=0;

  1590.     float fadd_bias = vc->add_bias;

  1591. 

  1592.     if (get_bits1(gb)) {

  1593.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1594.         return -1; // packet type not audio

  1595.     }

  1596. 

  1597.     if (vc->mode_count==1) {

  1598.         mode_number=0;

  1599.     } else {

  1600.         mode_number=get_bits(gb, ilog(vc->mode_count-1));

  1601.     }

  1602.     vc->mode_number=mode_number;

  1603.     mapping=&vc->mappings[vc->modes[mode_number].mapping];

  1604. 

  1605.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1606. 

  1607.     if (vc->modes[mode_number].blockflag) {

  1608.         previous_window=get_bits1(gb);

  1609.         next_window=get_bits1(gb);

  1610.     }

  1611. 

  1612.     blocksize=vc->blocksize[vc->modes[mode_number].blockflag];

  1613.     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1614.     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1615. 

  1616. // Decode floor

  1617. 

  1618.     for(i=0;i<vc->audio_channels;++i) {

  1619.         vorbis_floor *floor;

  1620.         if (mapping->submaps>1) {

  1621.             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1622.         } else {

  1623.             floor=&vc->floors[mapping->submap_floor[0]];

  1624.         }

  1625. 

  1626.         no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);

  1627.         ch_floor_ptr+=blocksize/2;

  1628.     }

  1629. 

  1630. // Nonzero vector propagate

  1631. 

  1632.     for(i=mapping->coupling_steps-1;i>=0;--i) {

  1633.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1634.             no_residue[mapping->magnitude[i]]=0;

  1635.             no_residue[mapping->angle[i]]=0;

  1636.         }

  1637.     }

  1638. 

  1639. // Decode residue

  1640. 

  1641.     for(i=0;i<mapping->submaps;++i) {

  1642.         vorbis_residue *residue;

  1643.         uint_fast8_t ch=0;

  1644. 

  1645.         for(j=0;j<vc->audio_channels;++j) {

  1646.             if ((mapping->submaps==1) || (i=mapping->mux[j])) {

  1647.                 res_chan[j]=res_num;

  1648.                 if (no_residue[j]) {

  1649.                     do_not_decode[ch]=1;

  1650.                 } else {

  1651.                     do_not_decode[ch]=0;

  1652.                 }

  1653.                 ++ch;

  1654.                 ++res_num;

  1655.             }

  1656.         }

  1657.         residue=&vc->residues[mapping->submap_residue[i]];

  1658.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1659. 

  1660.         ch_res_ptr+=ch*blocksize/2;

  1661.     }

  1662. 

  1663. // Inverse coupling

  1664. 

  1665.     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed

  1666.         float *mag, *ang;

  1667. 

  1668.         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;

  1669.         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;

  1670.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);

  1671.     }

  1672. 

  1673. // Dotproduct

  1674. 

  1675.     for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {

  1676.         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;

  1677.         vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);

  1678.     }

  1679. 

  1680. // MDCT, overlap/add, save data for next overlapping  FPMATH

  1681. 

  1682.     for(j=0;j<vc->audio_channels;++j) {

  1683.         uint_fast8_t step=vc->audio_channels;

  1684.         uint_fast16_t k;

  1685.         float *saved=vc->saved+j*vc->blocksize[1]/2;

  1686.         float *ret=vc->ret;

  1687.         const float *lwin=vc->win[1];

  1688.         const float *swin=vc->win[0];

  1689.         float *buf=vc->buf;

  1690.         float *buf_tmp=vc->buf_tmp;

  1691. 

  1692.         ch_floor_ptr=vc->channel_floors+j*blocksize/2;

  1693. 

  1694.         saved_start=vc->saved_start;

  1695. 

  1696.         vc->mdct[0].fft.imdct_calc(&vc->mdct[vc->modes[mode_number].blockflag], buf, ch_floor_ptr, buf_tmp);

  1697. 

  1698.         //FIXME process channels together, to allow faster simd vector_fmul_add_add?

  1699.         if (vc->modes[mode_number].blockflag) {

  1700.             // -- overlap/add

  1701.             if (previous_window) {

  1702.                 vc->dsp.vector_fmul_add_add(ret+j, buf, lwin, saved, vc->add_bias, vc->blocksize[1]/2, step);

  1703.                 retlen=vc->blocksize[1]/2;

  1704.             } else {

  1705.                 int len = (vc->blocksize[1]-vc->blocksize[0])/4;

  1706.                 buf += len;

  1707.                 vc->dsp.vector_fmul_add_add(ret+j, buf, swin, saved, vc->add_bias, vc->blocksize[0]/2, step);

  1708.                 k = vc->blocksize[0]/2*step + j;

  1709.                 buf += vc->blocksize[0]/2;

  1710.                 if(vc->exp_bias){

  1711.                     for(i=0; i<len; i++, k+=step)

  1712.                         ((uint32_t*)ret)[k] = ((uint32_t*)buf)[i] + vc->exp_bias; // ret[k]=buf[i]*(1<<bias)

  1713.                 } else {

  1714.                     for(i=0; i<len; i++, k+=step)

  1715.                         ret[k] = buf[i] + fadd_bias;

  1716.                 }

  1717.                 buf=vc->buf;

  1718.                 retlen=vc->blocksize[0]/2+len;

  1719.             }

  1720.             // -- save

  1721.             if (next_window) {

  1722.                 buf += vc->blocksize[1]/2;

  1723.                 vc->dsp.vector_fmul_reverse(saved, buf, lwin, vc->blocksize[1]/2);

  1724.                 saved_start=0;

  1725.             } else {

  1726.                 saved_start=(vc->blocksize[1]-vc->blocksize[0])/4;

  1727.                 buf += vc->blocksize[1]/2;

  1728.                 for(i=0; i<saved_start; i++)

  1729.                     ((uint32_t*)saved)[i] = ((uint32_t*)buf)[i] + vc->exp_bias;

  1730.                 vc->dsp.vector_fmul_reverse(saved+saved_start, buf+saved_start, swin, vc->blocksize[0]/2);

  1731.             }

  1732.         } else {

  1733.             // --overlap/add

  1734.             if(vc->add_bias) {

  1735.                 for(k=j, i=0;i<saved_start;++i, k+=step)

  1736.                     ret[k] = saved[i] + fadd_bias;

  1737.             } else {

  1738.                 for(k=j, i=0;i<saved_start;++i, k+=step)

  1739.                     ret[k] = saved[i];

  1740.             }

  1741.             vc->dsp.vector_fmul_add_add(ret+k, buf, swin, saved+saved_start, vc->add_bias, vc->blocksize[0]/2, step);

  1742.             retlen=saved_start+vc->blocksize[0]/2;

  1743.             // -- save

  1744.             buf += vc->blocksize[0]/2;

  1745.             vc->dsp.vector_fmul_reverse(saved, buf, swin, vc->blocksize[0]/2);

  1746.             saved_start=0;

  1747.         }

  1748.     }

  1749.     vc->saved_start=saved_start;

  1750. 

  1751.     return retlen*vc->audio_channels;

  1752. }

  1753. 

  1754. // Return the decoded audio packet through the standard api

  1755. 

  1756. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1757.                         void *data, int *data_size,

  1758.                         uint8_t *buf, int buf_size)

  1759. {

  1760.     vorbis_context *vc = avccontext->priv_data ;

  1761.     GetBitContext *gb = &(vc->gb);

  1762. 

  1763.     int_fast16_t len;

  1764. 

  1765.     if(!buf_size){

  1766.         return 0;

  1767.     }

  1768. 

  1769.     AV_DEBUG("packet length %d \n", buf_size);

  1770. 

  1771.     init_get_bits(gb, buf, buf_size*8);

  1772. 

  1773.     len=vorbis_parse_audio_packet(vc);

  1774. 

  1775.     if (len<=0) {

  1776.         *data_size=0;

  1777.         return buf_size;

  1778.     }

  1779. 

  1780.     if (!vc->first_frame) {

  1781.         vc->first_frame=1;

  1782.         *data_size=0;

  1783.         return buf_size ;

  1784.     }

  1785. 

  1786.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1787. 

  1788.     vc->dsp.float_to_int16(data, vc->ret, len);

  1789.     *data_size=len*2;

  1790. 

  1791.     return buf_size ;

  1792. }

  1793. 

  1794. // Close decoder

  1795. 

  1796. static int vorbis_decode_close(AVCodecContext *avccontext) {

  1797.     vorbis_context *vc = avccontext->priv_data;

  1798. 

  1799.     vorbis_free(vc);

  1800. 

  1801.     return 0 ;

  1802. }

  1803. 

  1804. AVCodec vorbis_decoder = {

  1805.     "vorbis",

  1806.     CODEC_TYPE_AUDIO,

  1807.     CODEC_ID_VORBIS,

  1808.     sizeof(vorbis_context),

  1809.     vorbis_decode_init,

  1810.     NULL,

  1811.     vorbis_decode_close,

  1812.     vorbis_decode_frame,

  1813. };