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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 library is free software; you can redistribute it and/or

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

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

  9.  * version 2 of the License, or (at your option) any later version.

  10.  *

  11.  * This library is distributed in the hope that it will be useful,

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

  17.  * License along with this library; if not, write to the Free Software

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

  19.  *

  20.  */

  21. 

  22. #undef V_DEBUG

  23. //#define V_DEBUG

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

  25. 

  26. #include <math.h>

  27. 

  28. #define ALT_BITSTREAM_READER_LE

  29. #include "avcodec.h"

  30. #include "bitstream.h"

  31. #include "dsputil.h"

  32. 

  33. #include "vorbis.h"

  34. 

  35. #define V_NB_BITS 8

  36. #define V_NB_BITS2 11

  37. #define V_MAX_VLCS (1<<16)

  38. 

  39. #ifndef V_DEBUG

  40. #define AV_DEBUG(...)

  41. #endif

  42. 

  43. #undef NDEBUG

  44. #include <assert.h>

  45. 

  46. /* Helper functions */

  47. 

  48. /**

  49.  *  reads 0-32 bits when using the ALT_BITSTREAM_READER_LE bitstream reader

  50.  */

  51. static unsigned int get_bits_long_le(GetBitContext *s, int n){

  52.     if(n<=17) return get_bits(s, n);

  53.     else{

  54.         int ret= get_bits(s, 16);

  55.         return ret | (get_bits(s, n-16) << 16);

  56.     }

  57. }

  58. 

  59. #define ilog(i) av_log2(2*(i))

  60. 

  61. #define BARK(x) \

  62.     (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))

  63. 

  64. static unsigned int nth_root(unsigned int x, unsigned int n) {   // x^(1/n)

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

  66. 

  67.     do {

  68.         ++ret;

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

  70.     } while (j<=x);

  71. 

  72.     return (ret-1);

  73. }

  74. 

  75. static float vorbisfloat2float(uint_fast32_t val) {

  76.     double mant=val&0x1fffff;

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

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

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

  80. }

  81. 

  82. 

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

  84. 

  85. static int vorbis_len2vlc(vorbis_context *vc, uint_fast8_t *bits, uint_fast32_t *codes, uint_fast32_t num) {

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

  87.         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

  88. 

  89.     uint_fast8_t i,j;

  90.     uint_fast32_t code,p;

  91. 

  92. #ifdef V_DEBUG

  93.     GetBitContext gb;

  94. #endif

  95. 

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

  97.     if (p==num) {

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

  99.         return 0;

  100.     }

  101. 

  102.     codes[p]=0;

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

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

  105.     }

  106. 

  107. #ifdef V_DEBUG

  108.     av_log(vc->avccontext, AV_LOG_INFO, " %d. of %d code len %d code %d - ", p, num, bits[p], codes[p]);

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

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

  111.         av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");

  112.     }

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

  114. #endif

  115. 

  116.     ++p;

  117. 

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

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

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

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

  122.             if (exit_at_level[i]) break;

  123.         }

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

  125.         code=exit_at_level[i];

  126.         exit_at_level[i]=0;

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

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

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

  130.         }

  131.         codes[p]=code;

  132. 

  133. #ifdef V_DEBUG

  134.         av_log(vc->avccontext, AV_LOG_INFO, " %d. code len %d code %d - ", p, bits[p], codes[p]);

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

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

  137.             av_log(vc->avccontext, AV_LOG_INFO, "%s", get_bits1(&gb) ? "1" : "0");

  138.         }

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

  140. #endif

  141. 

  142.     }

  143. 

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

  145. 

  146.     return 0;

  147. }

  148. 

  149. // Free all allocated memory -----------------------------------------

  150. 

  151. static void vorbis_free(vorbis_context *vc) {

  152.     int_fast16_t i;

  153. 

  154.     av_freep(&vc->channel_residues);

  155.     av_freep(&vc->channel_floors);

  156.     av_freep(&vc->saved);

  157.     av_freep(&vc->ret);

  158.     av_freep(&vc->buf);

  159.     av_freep(&vc->buf_tmp);

  160. 

  161.     av_freep(&vc->residues);

  162.     av_freep(&vc->modes);

  163. 

  164.     ff_mdct_end(&vc->mdct0);

  165.     ff_mdct_end(&vc->mdct1);

  166. 

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

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

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

  170.     }

  171.     av_freep(&vc->codebooks);

  172. 

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

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

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

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

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

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

  179.         }

  180.         else {

  181.             av_free(vc->floors[i].data.t1.x_list);

  182.             av_free(vc->floors[i].data.t1.x_list_order);

  183.             av_free(vc->floors[i].data.t1.low_neighbour);

  184.             av_free(vc->floors[i].data.t1.high_neighbour);

  185.         }

  186.     }

  187.     av_freep(&vc->floors);

  188. 

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

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

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

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

  193.     }

  194.     av_freep(&vc->mappings);

  195. }

  196. 

  197. // Parse setup header -------------------------------------------------

  198. 

  199. // Process codebooks part

  200. 

  201. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {

  202.     uint_fast16_t cb;

  203.     uint_fast8_t *tmp_vlc_bits;

  204.     uint_fast32_t *tmp_vlc_codes;

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

  206. 

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

  208. 

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

  210. 

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

  212.     tmp_vlc_bits=(uint_fast8_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast8_t));

  213.     tmp_vlc_codes=(uint_fast32_t *)av_mallocz(V_MAX_VLCS * sizeof(uint_fast32_t));

  214. 

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

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

  217.         uint_fast8_t ordered;

  218.         uint_fast32_t t, used_entries=0;

  219.         uint_fast32_t entries;

  220. 

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

  222. 

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

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

  225.             goto error;

  226.         }

  227. 

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

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

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

  231.             goto error;

  232.         }

  233.         entries=get_bits(gb, 24);

  234.         if (entries>V_MAX_VLCS) {

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

  236.             goto error;

  237.         }

  238. 

  239.         ordered=get_bits1(gb);

  240. 

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

  242. 

  243.         if (!ordered) {

  244.             uint_fast16_t ce;

  245.             uint_fast8_t flag;

  246.             uint_fast8_t sparse=get_bits1(gb);

  247. 

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

  249. 

  250.             if (sparse) {

  251.                 AV_DEBUG(" sparse \n");

  252. 

  253.                 used_entries=0;

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

  255.                     flag=get_bits1(gb);

  256.                     if (flag) {

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

  258.                         ++used_entries;

  259.                     }

  260.                     else tmp_vlc_bits[ce]=0;

  261.                 }

  262.             } else {

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

  264. 

  265.                 used_entries=entries;

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

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

  268.                 }

  269.             }

  270.         } else {

  271.             uint_fast16_t current_entry=0;

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

  273. 

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

  275. 

  276.             used_entries=entries;

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

  278.                 uint_fast16_t i, number;

  279. 

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

  281. 

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

  283. 

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

  285. 

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

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

  288.                 }

  289. 

  290.                 current_entry+=number;

  291.             }

  292.             if (current_entry>used_entries) {

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

  294.                 goto error;

  295.             }

  296.         }

  297. 

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

  299. 

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

  301. 

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

  303. 

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

  305.             uint_fast16_t i, j, k;

  306.             uint_fast16_t codebook_lookup_values=nth_root(entries, codebook_setup->dimensions);

  307.             uint_fast16_t codebook_multiplicands[codebook_lookup_values];

  308. 

  309.             float codebook_minimum_value=vorbisfloat2float(get_bits_long_le(gb, 32));

  310.             float codebook_delta_value=vorbisfloat2float(get_bits_long_le(gb, 32));

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

  312.             uint_fast8_t codebook_sequence_p=get_bits1(gb);

  313. 

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

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

  316. 

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

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

  319. 

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

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

  322.             }

  323. 

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

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

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

  327.                 uint_fast8_t dim=codebook_setup->dimensions;

  328. 

  329.                 if (tmp_vlc_bits[i]) {

  330.                     float last=0.0;

  331.                     uint_fast32_t lookup_offset=i;

  332. 

  333. #ifdef V_DEBUG

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

  335. #endif

  336. 

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

  338.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  340.                         if (codebook_sequence_p) {

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

  342.                         }

  343.                         lookup_offset/=codebook_lookup_values;

  344.                     }

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

  346. 

  347. #ifdef V_DEBUG

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

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

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

  351.                     }

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

  353. #endif

  354. 

  355.                     ++j;

  356.                 }

  357.             }

  358.             if (j!=used_entries) {

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

  360.                 goto error;

  361.             }

  362.             entries=used_entries;

  363.         }

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

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

  366.             goto error;

  367.         }

  368. 

  369. // Initialize VLC table

  370.         if (vorbis_len2vlc(vc, tmp_vlc_bits, tmp_vlc_codes, entries)) {

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

  372.             goto error;

  373.         }

  374.         codebook_setup->maxdepth=0;

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

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

  377. 

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

  379.         else                                       codebook_setup->nb_bits=V_NB_BITS;

  380. 

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

  382. 

  383.         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)) {

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

  385.             goto error;

  386.         }

  387.     }

  388. 

  389.     av_free(tmp_vlc_bits);

  390.     av_free(tmp_vlc_codes);

  391.     return 0;

  392. 

  393. // Error:

  394. error:

  395.     av_free(tmp_vlc_bits);

  396.     av_free(tmp_vlc_codes);

  397.     return 1;

  398. }

  399. 

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

  401. 

  402. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {

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

  404.     uint_fast8_t i;

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

  406. 

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

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

  409. 

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

  411. 

  412.         if (vorbis_tdtransform) {

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

  414.             return 1;

  415.         }

  416.     }

  417.     return 0;

  418. }

  419. 

  420. // Process floors part

  421. 

  422. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  423.                                          vorbis_floor_data *vfu, float *vec);

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

  425. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  426.                                          vorbis_floor_data *vfu, float *vec);

  427. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {

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

  429.     uint_fast16_t i,j,k;

  430. 

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

  432. 

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

  434. 

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

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

  437. 

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

  439. 

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

  441. 

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

  443.             uint_fast8_t maximum_class=0;

  444.             uint_fast8_t rangebits;

  445.             uint_fast16_t floor1_values=2;

  446. 

  447.             floor_setup->decode=vorbis_floor1_decode;

  448. 

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

  450. 

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

  452. 

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

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

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

  456. 

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

  458. 

  459.             }

  460. 

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

  462. 

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

  464. 

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

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

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

  468. 

  469.                 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]);

  470. 

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

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

  473. 

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

  475.                 }

  476. 

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

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

  479. 

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

  481.                 }

  482.             }

  483. 

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

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

  486. 

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

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

  489.             }

  490. 

  491.             floor_setup->data.t1.x_list=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));

  492.             floor_setup->data.t1.x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));

  493.             floor_setup->data.t1.low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));

  494.             floor_setup->data.t1.high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(uint_fast16_t));

  495. 

  496. 

  497.             rangebits=get_bits(gb, 4);

  498.             floor_setup->data.t1.x_list[0] = 0;

  499.             floor_setup->data.t1.x_list[1] = (1<<rangebits);

  500. 

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

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

  503.                     floor_setup->data.t1.x_list[floor1_values]=get_bits(gb, rangebits);

  504. 

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

  506.                 }

  507.             }

  508. 

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

  510. 

  511.             for(k=0;k<floor_setup->data.t1.x_list_dim;++k) {

  512.                 floor_setup->data.t1.x_list_order[k]=k;

  513.             }

  514. 

  515.             for(k=0;k<floor_setup->data.t1.x_list_dim-1;++k) {   // FIXME optimize sorting ?

  516.                 for(j=k+1;j<floor_setup->data.t1.x_list_dim;++j) {

  517.                     if(floor_setup->data.t1.x_list[floor_setup->data.t1.x_list_order[k]]>floor_setup->data.t1.x_list[floor_setup->data.t1.x_list_order[j]]) {

  518.                         uint_fast16_t tmp=floor_setup->data.t1.x_list_order[k];

  519.                         floor_setup->data.t1.x_list_order[k]=floor_setup->data.t1.x_list_order[j];

  520.                         floor_setup->data.t1.x_list_order[j]=tmp;

  521.                     }

  522.                 }

  523.             }

  524. 

  525. // Precalculate low and high neighbours

  526. 

  527.             for(k=2;k<floor_setup->data.t1.x_list_dim;++k) {

  528.                 floor_setup->data.t1.low_neighbour[k]=0;

  529.                 floor_setup->data.t1.high_neighbour[k]=1;  // correct according to SPEC requirements

  530. 

  531.                 for (j=0;j<k;++j) {

  532.                     if ((floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[k]) &&

  533.                       (floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[floor_setup->data.t1.low_neighbour[k]])) {

  534.                         floor_setup->data.t1.low_neighbour[k]=j;

  535.                     }

  536.                     if ((floor_setup->data.t1.x_list[j]>floor_setup->data.t1.x_list[k]) &&

  537.                       (floor_setup->data.t1.x_list[j]<floor_setup->data.t1.x_list[floor_setup->data.t1.high_neighbour[k]])) {

  538.                         floor_setup->data.t1.high_neighbour[k]=j;

  539.                     }

  540.                 }

  541.             }

  542.         }

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

  544.             uint_fast8_t max_codebook_dim=0;

  545. 

  546.             floor_setup->decode=vorbis_floor0_decode;

  547. 

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

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

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

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

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

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

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

  555.               av_log(vc->avccontext, AV_LOG_ERROR,

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

  557.               return 1;

  558.             }

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

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

  561. 

  562.             /* allocate mem for booklist */

  563.             floor_setup->data.t0.book_list=

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

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

  566.             /* read book indexes */

  567.             {

  568.                 int idx;

  569.                 uint_fast8_t book_idx;

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

  571.                     book_idx=get_bits(gb, 8);

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

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

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

  575. 

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

  577.                         return 1;

  578.                 }

  579.             }

  580. 

  581.             create_map( vc, i );

  582. 

  583.             /* allocate mem for lsp coefficients */

  584.             {

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

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

  587.                 floor_setup->data.t0.lsp=

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

  589.                               * sizeof(float));

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

  591.             }

  592. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  606.             {

  607.               int idx;

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

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

  610.                   idx+1,

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

  612.               }

  613.             }

  614. #endif

  615.         }

  616.         else {

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

  618.             return 1;

  619.         }

  620.     }

  621.     return 0;

  622. }

  623. 

  624. // Process residues part

  625. 

  626. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){

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

  628.     uint_fast8_t i, j, k;

  629. 

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

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

  632. 

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

  634. 

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

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

  637.         uint_fast8_t cascade[64];

  638.         uint_fast8_t high_bits;

  639.         uint_fast8_t low_bits;

  640. 

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

  642. 

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

  644. 

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

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

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

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

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

  650. 

  651.         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,

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

  653. 

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

  655.             high_bits=0;

  656.             low_bits=get_bits(gb, 3);

  657.             if (get_bits1(gb)) {

  658.                 high_bits=get_bits(gb, 5);

  659.             }

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

  661. 

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

  663.         }

  664. 

  665.         res_setup->maxpass=0;

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

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

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

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

  670. 

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

  672. 

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

  674.                         res_setup->maxpass=k;

  675.                     }

  676.                 } else {

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

  678.                 }

  679.             }

  680.         }

  681.     }

  682.     return 0;

  683. }

  684. 

  685. // Process mappings part

  686. 

  687. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {

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

  689.     uint_fast8_t i, j;

  690. 

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

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

  693. 

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

  695. 

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

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

  698. 

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

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

  701.             return 1;

  702.         }

  703.         if (get_bits1(gb)) {

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

  705.         } else {

  706.             mapping_setup->submaps=1;

  707.         }

  708. 

  709.         if (get_bits1(gb)) {

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

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

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

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

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

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

  716.                 // FIXME: sanity checks

  717.             }

  718.         } else {

  719.             mapping_setup->coupling_steps=0;

  720.         }

  721. 

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

  723. 

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

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

  726.             return 1; // following spec.

  727.         }

  728. 

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

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

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

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

  733.             }

  734.         }

  735. 

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

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

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

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

  740. 

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

  742.         }

  743.     }

  744.     return 0;

  745. }

  746. 

  747. // Process modes part

  748. 

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

  750. {

  751.     vorbis_floor * floors=vc->floors;

  752.     vorbis_floor0 * vf;

  753.     int idx;

  754.     int_fast8_t blockflag;

  755.     int_fast32_t * map;

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

  757. 

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

  759.     {

  760.     n=(blockflag ? vc->blocksize_1 : vc->blocksize_0) / 2;

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

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

  763. 

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

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

  766. 

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

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

  769.                               ((vf->bark_map_size)/

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

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

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

  773.         }

  774.     }

  775.     map[n]=-1;

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

  777.     }

  778. 

  779. #   ifdef V_DEBUG

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

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

  782.                  idx, map[idx]);

  783.     }

  784. #   endif

  785. }

  786. 

  787. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {

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

  789.     uint_fast8_t i;

  790. 

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

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

  793. 

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

  795. 

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

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

  798. 

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

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

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

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

  803. 

  804.         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);

  805.     }

  806.     return 0;

  807. }

  808. 

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

  810. 

  811. static int vorbis_parse_setup_hdr(vorbis_context *vc) {

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

  813. 

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

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

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

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

  818.         return 1;

  819.     }

  820. 

  821.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  823.         return 2;

  824.     }

  825.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  827.         return 3;

  828.     }

  829.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  831.         return 4;

  832.     }

  833.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  835.         return 5;

  836.     }

  837.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  839.         return 6;

  840.     }

  841.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  843.         return 7;

  844.     }

  845.     if (!get_bits1(gb)) {

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

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

  848.     }

  849. 

  850.     return 0;

  851. }

  852. 

  853. // Process the identification header

  854. 

  855. static int vorbis_parse_id_hdr(vorbis_context *vc){

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

  857.     uint_fast8_t bl0, bl1;

  858.     const float *vwin[8]={ vwin64, vwin128, vwin256, vwin512, vwin1024, vwin2048, vwin4096, vwin8192 };

  859. 

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

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

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

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

  864.         return 1;

  865.     }

  866. 

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

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

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

  870.     vc->bitrate_maximum=get_bits_long_le(gb, 32);

  871.     vc->bitrate_nominal=get_bits_long_le(gb, 32);

  872.     vc->bitrate_minimum=get_bits_long_le(gb, 32);

  873.     bl0=get_bits(gb, 4);

  874.     bl1=get_bits(gb, 4);

  875.     vc->blocksize_0=(1<<bl0);

  876.     vc->blocksize_1=(1<<bl1);

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

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

  879.         return 3;

  880.     }

  881.     // output format int16

  882.     if (vc->blocksize_1/2 * vc->audio_channels * 2 >

  883.                                              AVCODEC_MAX_AUDIO_FRAME_SIZE) {

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

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

  886.         return 4;

  887.     }

  888.     vc->swin=vwin[bl0-6];

  889.     vc->lwin=vwin[bl1-6];

  890. 

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

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

  893.         return 2;

  894.     }

  895. 

  896.     vc->channel_residues=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));

  897.     vc->channel_floors=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));

  898.     vc->saved=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));

  899.     vc->ret=(float *)av_malloc((vc->blocksize_1/2)*vc->audio_channels * sizeof(float));

  900.     vc->buf=(float *)av_malloc(vc->blocksize_1 * sizeof(float));

  901.     vc->buf_tmp=(float *)av_malloc(vc->blocksize_1 * sizeof(float));

  902.     vc->saved_start=0;

  903. 

  904.     ff_mdct_init(&vc->mdct0, bl0, 1);

  905.     ff_mdct_init(&vc->mdct1, bl1, 1);

  906. 

  907.     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 ",

  908.             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize_0, vc->blocksize_1);

  909. 

  910. /*

  911.     BLK=vc->blocksize_0;

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

  913.         vc->swin[i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358)));

  914.     }

  915. */

  916. 

  917.     return 0;

  918. }

  919. 

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

  921. 

  922. static int vorbis_decode_init(AVCodecContext *avccontext) {

  923.     vorbis_context *vc = avccontext->priv_data ;

  924.     uint8_t *headers = avccontext->extradata;

  925.     int headers_len=avccontext->extradata_size;

  926.     uint8_t *header_start[3];

  927.     int header_len[3];

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

  929.     int i, j, hdr_type;

  930. 

  931.     vc->avccontext = avccontext;

  932. 

  933.     if (!headers_len) {

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

  935.         return -1;

  936.     }

  937. 

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

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

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

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

  942.             header_start[i] = headers;

  943.             headers += header_len[i];

  944.         }

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

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

  947.             header_len[i]=0;

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

  949.                 header_len[i]+=0xff;

  950.                 ++j;

  951.             }

  952.             if (j>=headers_len) {

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

  954.                 return -1;

  955.             }

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

  957.         }

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

  959.         headers+=j;

  960.         header_start[0] = headers;

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

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

  963.     } else {

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

  965.         return -1;

  966.     }

  967. 

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

  969.     hdr_type=get_bits(gb, 8);

  970.     if (hdr_type!=1) {

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

  972.         return -1;

  973.     }

  974.     if (vorbis_parse_id_hdr(vc)) {

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

  976.         vorbis_free(vc);

  977.         return -1;

  978.     }

  979. 

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

  981.     hdr_type=get_bits(gb, 8);

  982.     if (hdr_type!=5) {

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

  984.         return -1;

  985.     }

  986.     if (vorbis_parse_setup_hdr(vc)) {

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

  988.         vorbis_free(vc);

  989.         return -1;

  990.     }

  991. 

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

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

  994. 

  995.     return 0 ;

  996. }

  997. 

  998. // Decode audiopackets -------------------------------------------------

  999. 

  1000. // Read and decode floor

  1001. 

  1002. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  1003.                                          vorbis_floor_data *vfu, float *vec) {

  1004.     vorbis_floor0 * vf=&vfu->t0;

  1005.     float * lsp=vf->lsp;

  1006.     uint_fast32_t amplitude;

  1007.     uint_fast32_t book_idx;

  1008.     uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;

  1009. 

  1010.     amplitude=get_bits(&vc->gb, vf->amplitude_bits);

  1011.     if (amplitude>0) {

  1012.         float last = 0;

  1013.         uint_fast16_t lsp_len = 0;

  1014.         uint_fast16_t idx;

  1015.         vorbis_codebook codebook;

  1016. 

  1017.         book_idx=get_bits(&vc->gb, ilog(vf->num_books));

  1018.         if ( book_idx >= vf->num_books ) {

  1019.             av_log( vc->avccontext, AV_LOG_ERROR,

  1020.                     "floor0 dec: booknumber too high!\n" );

  1021.             //FIXME: look above

  1022.         }

  1023.         AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );

  1024.         codebook=vc->codebooks[vf->book_list[book_idx]];

  1025. 

  1026.         while (lsp_len<vf->order) {

  1027.             int vec_off;

  1028. 

  1029.             AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );

  1030.             AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );

  1031.             /* read temp vector */

  1032.             vec_off=get_vlc2(&vc->gb,

  1033.                              codebook.vlc.table,

  1034.                              codebook.nb_bits,

  1035.                              codebook.maxdepth ) *

  1036.                              codebook.dimensions;

  1037.             AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );

  1038.             /* copy each vector component and add last to it */

  1039.             for (idx=0; idx<codebook.dimensions; ++idx) {

  1040.                 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;

  1041.             }

  1042.             last=lsp[lsp_len+idx-1]; /* set last to last vector component */

  1043. 

  1044.             lsp_len += codebook.dimensions;

  1045.         }

  1046. #ifdef V_DEBUG

  1047.         /* DEBUG: output lsp coeffs */

  1048.         {

  1049.             int idx;

  1050.             for ( idx = 0; idx < lsp_len; ++idx )

  1051.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );

  1052.         }

  1053. #endif

  1054. 

  1055.         /* synthesize floor output vector */

  1056.         {

  1057.             int i;

  1058.             int order=vf->order;

  1059.             float wstep=M_PI/vf->bark_map_size;

  1060. 

  1061.             for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }

  1062. 

  1063.             AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",

  1064.                      vf->map_size, order, wstep);

  1065. 

  1066.             i=0;

  1067.             while(i<vf->map_size[blockflag]) {

  1068.                 int j, iter_cond=vf->map[blockflag][i];

  1069.                 float p=0.5f;

  1070.                 float q=0.5f;

  1071.                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times

  1072. 

  1073.                 /* similar part for the q and p products */

  1074.                 for(j=0;j<order;j+=2) {

  1075.                     q *= lsp[j]  -two_cos_w;

  1076.                     p *= lsp[j+1]-two_cos_w;

  1077.                 }

  1078.                 if(j==order) { // even order

  1079.                     p *= p*(2.0f-two_cos_w);

  1080.                     q *= q*(2.0f+two_cos_w);

  1081.                 }

  1082.                 else { // odd order

  1083.                     q *= two_cos_w-lsp[j]; // one more time for q

  1084. 

  1085.                     /* final step and square */

  1086.                     p *= p*(4.f-two_cos_w*two_cos_w);

  1087.                     q *= q;

  1088.                 }

  1089. 

  1090.                 /* calculate linear floor value */

  1091.                 {

  1092.                     q=exp( (

  1093.                              ( (amplitude*vf->amplitude_offset)/

  1094.                                (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )

  1095.                              - vf->amplitude_offset ) * .11512925f

  1096.                          );

  1097.                 }

  1098. 

  1099.                 /* fill vector */

  1100.                 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);

  1101.             }

  1102.         }

  1103.     }

  1104.     else {

  1105.         /* this channel is unused */

  1106.         return 1;

  1107.     }

  1108. 

  1109.     AV_DEBUG(" Floor0 decoded\n");

  1110. 

  1111.     return 0;

  1112. }

  1113. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {

  1114.     vorbis_floor1 * vf=&vfu->t1;

  1115.     GetBitContext *gb=&vc->gb;

  1116.     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };

  1117.     uint_fast16_t range=range_v[vf->multiplier-1];

  1118.     uint_fast16_t floor1_Y[vf->x_list_dim];

  1119.     uint_fast16_t floor1_Y_final[vf->x_list_dim];

  1120.     uint_fast8_t floor1_flag[vf->x_list_dim];

  1121.     uint_fast8_t class_;

  1122.     uint_fast8_t cdim;

  1123.     uint_fast8_t cbits;

  1124.     uint_fast8_t csub;

  1125.     uint_fast8_t cval;

  1126.     int_fast16_t book;

  1127.     uint_fast16_t offset;

  1128.     uint_fast16_t i,j;

  1129.     uint_fast16_t *floor_x_sort=vf->x_list_order;

  1130.     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?

  1131.     int_fast16_t dy, err;

  1132.     uint_fast16_t lx,hx, ly, hy=0;

  1133. 

  1134. 

  1135.     if (!get_bits1(gb)) return 1; // silence

  1136. 

  1137. // Read values (or differences) for the floor's points

  1138. 

  1139.     floor1_Y[0]=get_bits(gb, ilog(range-1));

  1140.     floor1_Y[1]=get_bits(gb, ilog(range-1));

  1141. 

  1142.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1143. 

  1144.     offset=2;

  1145.     for(i=0;i<vf->partitions;++i) {

  1146.         class_=vf->partition_class[i];

  1147.         cdim=vf->class_dimensions[class_];

  1148.         cbits=vf->class_subclasses[class_];

  1149.         csub=(1<<cbits)-1;

  1150.         cval=0;

  1151. 

  1152.         AV_DEBUG("Cbits %d \n", cbits);

  1153. 

  1154.         if (cbits) { // this reads all subclasses for this partition's class

  1155.             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,

  1156.             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);

  1157.         }

  1158. 

  1159.         for(j=0;j<cdim;++j) {

  1160.             book=vf->subclass_books[class_][cval & csub];

  1161. 

  1162.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1163. 

  1164.             cval=cval>>cbits;

  1165.             if (book>0) {

  1166.                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,

  1167.                 vc->codebooks[book].nb_bits, 3);

  1168.             } else {

  1169.                 floor1_Y[offset+j]=0;

  1170.             }

  1171. 

  1172.             AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);

  1173.         }

  1174.         offset+=cdim;

  1175.     }

  1176. 

  1177. // Amplitude calculation from the differences

  1178. 

  1179.     floor1_flag[0]=1;

  1180.     floor1_flag[1]=1;

  1181.     floor1_Y_final[0]=floor1_Y[0];

  1182.     floor1_Y_final[1]=floor1_Y[1];

  1183. 

  1184.     for(i=2;i<vf->x_list_dim;++i) {

  1185.         uint_fast16_t val, highroom, lowroom, room;

  1186.         uint_fast16_t high_neigh_offs;

  1187.         uint_fast16_t low_neigh_offs;

  1188. 

  1189.         low_neigh_offs=vf->low_neighbour[i];

  1190.         high_neigh_offs=vf->high_neighbour[i];

  1191.         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin

  1192.         adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];

  1193.         ady= ABS(dy);

  1194.         err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);

  1195.         off=err/adx;

  1196.         if (dy<0) {

  1197.             predicted=floor1_Y_final[low_neigh_offs]-off;

  1198.         } else {

  1199.             predicted=floor1_Y_final[low_neigh_offs]+off;

  1200.         } // render_point end

  1201. 

  1202.         val=floor1_Y[i];

  1203.         highroom=range-predicted;

  1204.         lowroom=predicted;

  1205.         if (highroom < lowroom) {

  1206.             room=highroom*2;

  1207.         } else {

  1208.             room=lowroom*2;   // SPEC mispelling

  1209.         }

  1210.         if (val) {

  1211.             floor1_flag[low_neigh_offs]=1;

  1212.             floor1_flag[high_neigh_offs]=1;

  1213.             floor1_flag[i]=1;

  1214.             if (val>=room) {

  1215.                 if (highroom > lowroom) {

  1216.                     floor1_Y_final[i]=val-lowroom+predicted;

  1217.                 } else {

  1218.                     floor1_Y_final[i]=predicted-val+highroom-1;

  1219.                 }

  1220.             } else {

  1221.                 if (val & 1) {

  1222.                     floor1_Y_final[i]=predicted-(val+1)/2;

  1223.                 } else {

  1224.                     floor1_Y_final[i]=predicted+val/2;

  1225.                 }

  1226.             }

  1227.         } else {

  1228.             floor1_flag[i]=0;

  1229.             floor1_Y_final[i]=predicted;

  1230.         }

  1231. 

  1232.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);

  1233.     }

  1234. 

  1235. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1236. 

  1237.     hx=0;

  1238.     lx=0;

  1239.     ly=floor1_Y_final[0]*vf->multiplier;  // conforms to SPEC

  1240. 

  1241.     vec[0]=floor1_inverse_db_table[ly];

  1242. 

  1243.     for(i=1;i<vf->x_list_dim;++i) {

  1244.         AV_DEBUG(" Looking at post %d \n", i);

  1245. 

  1246.         if (floor1_flag[floor_x_sort[i]]) {   // SPEC mispelled

  1247.             int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2  base = 2blablabla ?????

  1248. 

  1249.             hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;

  1250.             hx=vf->x_list[floor_x_sort[i]];

  1251. 

  1252.             dy=hy-ly;

  1253.             adx=hx-lx;

  1254.             ady= (dy<0) ? -dy:dy;//ABS(dy);

  1255.             base=dy/adx;

  1256. 

  1257.             AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);

  1258. 

  1259.             x=lx;

  1260.             y=ly;

  1261.             err=0;

  1262.             if (dy<0) {

  1263.                 sy=base-1;

  1264.             } else {

  1265.                 sy=base+1;

  1266.             }

  1267.             ady=ady-(base<0 ? -base : base)*adx;

  1268.             vec[x]=floor1_inverse_db_table[y];

  1269. 

  1270.             AV_DEBUG(" vec[ %d ] = %d \n", x, y);

  1271. 

  1272.             for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {

  1273.                 err+=ady;

  1274.                 if (err>=adx) {

  1275.                     err-=adx;

  1276.                     y+=sy;

  1277.                 } else {

  1278.                     y+=base;

  1279.                 }

  1280.                 vec[x]=floor1_inverse_db_table[y];

  1281. 

  1282.                 AV_DEBUG(" vec[ %d ] = %d \n", x, y);

  1283.             }

  1284. 

  1285. /*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point

  1286.                 dy=hy-ly;

  1287.                 adx=hx-lx;

  1288.                 ady= dy<0 ? -dy : dy;

  1289.                 err=ady*j;

  1290.                 off=err/adx;

  1291.                 if (dy<0) {

  1292.                     predicted=ly-off;

  1293.                 } else {

  1294.                     predicted=ly+off;

  1295.                 }

  1296.                 if (lx+j < vf->x_list[1]) {

  1297.                     vec[lx+j]=floor1_inverse_db_table[predicted];

  1298.                 }

  1299.             }*/

  1300. 

  1301.             lx=hx;

  1302.             ly=hy;

  1303.         }

  1304.     }

  1305. 

  1306.     if (hx<vf->x_list[1]) {

  1307.         for(i=hx;i<vf->x_list[1];++i) {

  1308.             vec[i]=floor1_inverse_db_table[hy];

  1309.         }

  1310.     }

  1311. 

  1312.     AV_DEBUG(" Floor decoded\n");

  1313. 

  1314.     return 0;

  1315. }

  1316. 

  1317. // Read and decode residue

  1318. 

  1319. 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) {

  1320.     GetBitContext *gb=&vc->gb;

  1321.     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;

  1322.     uint_fast16_t n_to_read=vr->end-vr->begin;

  1323.     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;

  1324.     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];

  1325.     uint_fast8_t pass;

  1326.     uint_fast8_t ch_used;

  1327.     uint_fast8_t i,j,l;

  1328.     uint_fast16_t k;

  1329. 

  1330.     if (vr->type==2) {

  1331.         for(j=1;j<ch;++j) {

  1332.                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input

  1333.         }

  1334.         if (do_not_decode[0]) return 0;

  1335.         ch_used=1;

  1336.     } else {

  1337.         ch_used=ch;

  1338.     }

  1339. 

  1340.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1341. 

  1342.     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?

  1343.         uint_fast16_t voffset;

  1344.         uint_fast16_t partition_count;

  1345.         uint_fast16_t j_times_ptns_to_read;

  1346. 

  1347.         voffset=vr->begin;

  1348.         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error

  1349.             if (!pass) {

  1350.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1351.                     if (!do_not_decode[j]) {

  1352.                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1353.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1354. 

  1355.                         AV_DEBUG("Classword: %d \n", temp);

  1356. 

  1357.                         assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]

  1358.                         for(i=0;i<c_p_c;++i) {

  1359.                             uint_fast32_t temp2;

  1360. 

  1361.                             temp2=(((uint_fast64_t)temp) * inverse[vr->classifications])>>32;

  1362.                             if (partition_count+c_p_c-1-i < ptns_to_read) {

  1363.                                 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;

  1364.                             }

  1365.                             temp=temp2;

  1366.                         }

  1367.                     }

  1368.                     j_times_ptns_to_read+=ptns_to_read;

  1369.                 }

  1370.             }

  1371.             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {

  1372.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1373.                     uint_fast16_t voffs;

  1374. 

  1375.                     if (!do_not_decode[j]) {

  1376.                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];

  1377.                         int_fast16_t vqbook=vr->books[vqclass][pass];

  1378. 

  1379.                         if (vqbook>=0) {

  1380.                             uint_fast16_t coffs;

  1381.                             uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;

  1382.                             vorbis_codebook codebook= vc->codebooks[vqbook];

  1383. 

  1384.                             if (vr->type==0) {

  1385. 

  1386.                                 voffs=voffset+j*vlen;

  1387.                                 for(k=0;k<step;++k) {

  1388.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;

  1389.                                     for(l=0;l<codebook.dimensions;++l) {

  1390.                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH

  1391.                                     }

  1392.                                 }

  1393.                             }

  1394.                             else if (vr->type==1) {

  1395.                                 voffs=voffset+j*vlen;

  1396.                                 for(k=0;k<step;++k) {

  1397.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;

  1398.                                     for(l=0;l<codebook.dimensions;++l, ++voffs) {

  1399.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1400. 

  1401.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1402.                                     }

  1403.                                 }

  1404.                             }

  1405.                             else if (vr->type==2 && ch==2 && (voffset&1)==0 && (codebook.dimensions&1)==0) { // most frequent case optimized

  1406.                                 voffs=voffset>>1;

  1407. 

  1408.                                 for(k=0;k<step;++k) {

  1409.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;

  1410.                                     for(l=0;l<codebook.dimensions;l+=2, voffs++) {

  1411.                                         vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH

  1412.                                         vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH

  1413. 

  1414.                                         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);

  1415.                                     }

  1416.                                 }

  1417. 

  1418.                             }

  1419.                             else if (vr->type==2) {

  1420.                                 voffs=voffset;

  1421. 

  1422.                                 for(k=0;k<step;++k) {

  1423.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;

  1424.                                     for(l=0;l<codebook.dimensions;++l, ++voffs) {

  1425.                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %

  1426. 

  1427.                                         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);

  1428.                                     }

  1429.                                 }

  1430.                             } else {

  1431.                                 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1432.                                 return 1;

  1433.                             }

  1434.                         }

  1435.                     }

  1436.                     j_times_ptns_to_read+=ptns_to_read;

  1437.                 }

  1438.                 ++partition_count;

  1439.                 voffset+=vr->partition_size;

  1440.             }

  1441.         }

  1442.     }

  1443.     return 0;

  1444. }

  1445. 

  1446. // Decode the audio packet using the functions above

  1447. #define BIAS 385

  1448. 

  1449. static int vorbis_parse_audio_packet(vorbis_context *vc) {

  1450.     GetBitContext *gb=&vc->gb;

  1451. 

  1452.     uint_fast8_t previous_window=0,next_window=0;

  1453.     uint_fast8_t mode_number;

  1454.     uint_fast16_t blocksize;

  1455.     int_fast32_t i,j;

  1456.     uint_fast8_t no_residue[vc->audio_channels];

  1457.     uint_fast8_t do_not_decode[vc->audio_channels];

  1458.     vorbis_mapping *mapping;

  1459.     float *ch_res_ptr=vc->channel_residues;

  1460.     float *ch_floor_ptr=vc->channel_floors;

  1461.     uint_fast8_t res_chan[vc->audio_channels];

  1462.     uint_fast8_t res_num=0;

  1463.     int_fast16_t retlen=0;

  1464.     uint_fast16_t saved_start=0;

  1465. 

  1466.     if (get_bits1(gb)) {

  1467.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1468.         return -1; // packet type not audio

  1469.     }

  1470. 

  1471.     if (vc->mode_count==1) {

  1472.         mode_number=0;

  1473.     } else {

  1474.         mode_number=get_bits(gb, ilog(vc->mode_count-1));

  1475.     }

  1476.     vc->mode_number=mode_number;

  1477.     mapping=&vc->mappings[vc->modes[mode_number].mapping];

  1478. 

  1479.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1480. 

  1481.     if (vc->modes[mode_number].blockflag) {

  1482.         previous_window=get_bits1(gb);

  1483.         next_window=get_bits1(gb);

  1484.     }

  1485. 

  1486.     blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;

  1487.     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1488.     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1489. 

  1490. // Decode floor

  1491. 

  1492.     for(i=0;i<vc->audio_channels;++i) {

  1493.         vorbis_floor *floor;

  1494.         if (mapping->submaps>1) {

  1495.             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1496.         } else {

  1497.             floor=&vc->floors[mapping->submap_floor[0]];

  1498.         }

  1499. 

  1500.         no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);

  1501.         ch_floor_ptr+=blocksize/2;

  1502.     }

  1503. 

  1504. // Nonzero vector propagate

  1505. 

  1506.     for(i=mapping->coupling_steps-1;i>=0;--i) {

  1507.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1508.             no_residue[mapping->magnitude[i]]=0;

  1509.             no_residue[mapping->angle[i]]=0;

  1510.         }

  1511.     }

  1512. 

  1513. // Decode residue

  1514. 

  1515.     for(i=0;i<mapping->submaps;++i) {

  1516.         vorbis_residue *residue;

  1517.         uint_fast8_t ch=0;

  1518. 

  1519.         for(j=0;j<vc->audio_channels;++j) {

  1520.             if ((mapping->submaps==1) || (i=mapping->mux[j])) {

  1521.                 res_chan[j]=res_num;

  1522.                 if (no_residue[j]) {

  1523.                     do_not_decode[ch]=1;

  1524.                 } else {

  1525.                     do_not_decode[ch]=0;

  1526.                 }

  1527.                 ++ch;

  1528.                 ++res_num;

  1529.             }

  1530.         }

  1531.         residue=&vc->residues[mapping->submap_residue[i]];

  1532.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1533. 

  1534.         ch_res_ptr+=ch*blocksize/2;

  1535.     }

  1536. 

  1537. // Inverse coupling

  1538. 

  1539.     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed

  1540.         float *mag, *ang;

  1541. 

  1542.         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;

  1543.         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;

  1544.         for(j=0;j<blocksize/2;++j) {

  1545.             float temp;

  1546.             if (mag[j]>0.0) {

  1547.                 if (ang[j]>0.0) {

  1548.                     ang[j]=mag[j]-ang[j];

  1549.                 } else {

  1550.                     temp=ang[j];

  1551.                     ang[j]=mag[j];

  1552.                     mag[j]+=temp;

  1553.                 }

  1554.             } else {

  1555.                 if (ang[j]>0.0) {

  1556.                     ang[j]+=mag[j];

  1557.                 } else {

  1558.                     temp=ang[j];

  1559.                     ang[j]=mag[j];

  1560.                     mag[j]-=temp;

  1561.                 }

  1562.             }

  1563.         }

  1564.     }

  1565. 

  1566. // Dotproduct

  1567. 

  1568.     for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {

  1569.         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;

  1570. 

  1571.         for(i=0;i<blocksize/2;++i) {

  1572.             ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH

  1573.         }

  1574.     }

  1575. 

  1576. // MDCT, overlap/add, save data for next overlapping  FPMATH

  1577. 

  1578.     for(j=0;j<vc->audio_channels;++j) {

  1579.         uint_fast8_t step=vc->audio_channels;

  1580.         uint_fast16_t k;

  1581.         float *saved=vc->saved+j*vc->blocksize_1/2;

  1582.         float *ret=vc->ret;

  1583.         const float *lwin=vc->lwin;

  1584.         const float *swin=vc->swin;

  1585.         float *buf=vc->buf;

  1586.         float *buf_tmp=vc->buf_tmp;

  1587. 

  1588.         ch_floor_ptr=vc->channel_floors+j*blocksize/2;

  1589. 

  1590.         saved_start=vc->saved_start;

  1591. 

  1592.         ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);

  1593. 

  1594.         if (vc->modes[mode_number].blockflag) {

  1595.             // -- overlap/add

  1596.             if (previous_window) {

  1597.                 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {

  1598.                     ret[k]=saved[i]+buf[i]*lwin[i]+BIAS;

  1599.                 }

  1600.                 retlen=vc->blocksize_1/2;

  1601.             } else {

  1602.                 buf += (vc->blocksize_1-vc->blocksize_0)/4;

  1603.                 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {

  1604.                     ret[k]=saved[i]+buf[i]*swin[i]+BIAS;

  1605.                 }

  1606.                 buf += vc->blocksize_0/2;

  1607.                 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {

  1608.                     ret[k]=buf[i]+BIAS;

  1609.                 }

  1610.                 buf=vc->buf;

  1611.                 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;

  1612.             }

  1613.             // -- save

  1614.             if (next_window) {

  1615.                 buf += vc->blocksize_1/2;

  1616.                 lwin += vc->blocksize_1/2-1;

  1617.                 for(i=0;i<vc->blocksize_1/2;++i) {

  1618.                     saved[i]=buf[i]*lwin[-i];

  1619.                 }

  1620.                 saved_start=0;

  1621.             } else {

  1622.                 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;

  1623.                 buf += vc->blocksize_1/2;

  1624.                 for(i=0;i<saved_start;++i) {

  1625.                     saved[i]=buf[i];

  1626.                 }

  1627.                 swin += vc->blocksize_0/2-1;

  1628.                 for(i=0;i<vc->blocksize_0/2;++i) {

  1629.                     saved[saved_start+i]=buf[saved_start+i]*swin[-i];

  1630.                 }

  1631.             }

  1632.         } else {

  1633.             // --overlap/add

  1634.             for(k=j, i=0;i<saved_start;++i, k+=step) {

  1635.                 ret[k]=saved[i]+BIAS;

  1636.             }

  1637.             for(i=0;i<vc->blocksize_0/2;++i, k+=step) {

  1638.                 ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS;

  1639.             }

  1640.             retlen=saved_start+vc->blocksize_0/2;

  1641.             // -- save

  1642.             buf += vc->blocksize_0/2;

  1643.             swin += vc->blocksize_0/2-1;

  1644.             for(i=0;i<vc->blocksize_0/2;++i) {

  1645.                 saved[i]=buf[i]*swin[-i];

  1646.             }

  1647.             saved_start=0;

  1648.         }

  1649.     }

  1650.     vc->saved_start=saved_start;

  1651. 

  1652.     return retlen*vc->audio_channels;

  1653. }

  1654. 

  1655. // Return the decoded audio packet through the standard api

  1656. 

  1657. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1658.                         void *data, int *data_size,

  1659.                         uint8_t *buf, int buf_size)

  1660. {

  1661.     vorbis_context *vc = avccontext->priv_data ;

  1662.     GetBitContext *gb = &(vc->gb);

  1663. 

  1664.     int_fast16_t i, len;

  1665. 

  1666.     if(!buf_size){

  1667.         return 0;

  1668.     }

  1669. 

  1670.     AV_DEBUG("packet length %d \n", buf_size);

  1671. 

  1672.     init_get_bits(gb, buf, buf_size*8);

  1673. 

  1674.     len=vorbis_parse_audio_packet(vc);

  1675. 

  1676.     if (len<=0) {

  1677.         *data_size=0;

  1678.         return buf_size;

  1679.     }

  1680. 

  1681.     if (!vc->first_frame) {

  1682.         vc->first_frame=1;

  1683.         *data_size=0;

  1684.         return buf_size ;

  1685.     }

  1686. 

  1687.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1688. 

  1689.     for(i=0;i<len;++i) {

  1690.         int_fast32_t tmp= ((int32_t*)vc->ret)[i];

  1691.         if(tmp & 0xf0000){

  1692. //            tmp= (0x43c0ffff - tmp)>>31; //ask gcc devs why this is slower

  1693.             if(tmp > 0x43c0ffff) tmp= 0xFFFF;

  1694.             else                 tmp= 0;

  1695.         }

  1696.         ((int16_t*)data)[i]=tmp - 0x8000;

  1697.     }

  1698. 

  1699.     *data_size=len*2;

  1700. 

  1701.     return buf_size ;

  1702. }

  1703. 

  1704. // Close decoder

  1705. 

  1706. static int vorbis_decode_close(AVCodecContext *avccontext) {

  1707.     vorbis_context *vc = avccontext->priv_data;

  1708. 

  1709.     vorbis_free(vc);

  1710. 

  1711.     return 0 ;

  1712. }

  1713. 

  1714. AVCodec vorbis_decoder = {

  1715.     "vorbis",

  1716.     CODEC_TYPE_AUDIO,

  1717.     CODEC_ID_VORBIS,

  1718.     sizeof(vorbis_context),

  1719.     vorbis_decode_init,

  1720.     NULL,

  1721.     vorbis_decode_close,

  1722.     vorbis_decode_frame,

  1723. };