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

  49. 

  50. #define BARK(x) \

  51.     (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))

  52. 

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

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

  55. 

  56.     do {

  57.         ++ret;

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

  59.     } while (j<=x);

  60. 

  61.     return (ret-1);

  62. }

  63. 

  64. static float vorbisfloat2float(uint_fast32_t val) {

  65.     double mant=val&0x1fffff;

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

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

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

  69. }

  70. 

  71. 

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

  73. 

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

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

  76.         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

  77. 

  78.     uint_fast8_t i,j;

  79.     uint_fast32_t code,p;

  80. 

  81. #ifdef V_DEBUG

  82.     GetBitContext gb;

  83. #endif

  84. 

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

  86.     if (p==num) {

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

  88.         return 0;

  89.     }

  90. 

  91.     codes[p]=0;

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

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

  94.     }

  95. 

  96. #ifdef V_DEBUG

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

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

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

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

  101.     }

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

  103. #endif

  104. 

  105.     ++p;

  106. 

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

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

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

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

  111.             if (exit_at_level[i]) break;

  112.         }

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

  114.         code=exit_at_level[i];

  115.         exit_at_level[i]=0;

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

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

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

  119.         }

  120.         codes[p]=code;

  121. 

  122. #ifdef V_DEBUG

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

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

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

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

  127.         }

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

  129. #endif

  130. 

  131.     }

  132. 

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

  134. 

  135.     return 0;

  136. }

  137. 

  138. // Free all allocated memory -----------------------------------------

  139. 

  140. static void vorbis_free(vorbis_context *vc) {

  141.     int_fast16_t i;

  142. 

  143.     av_freep(&vc->channel_residues);

  144.     av_freep(&vc->channel_floors);

  145.     av_freep(&vc->saved);

  146.     av_freep(&vc->ret);

  147.     av_freep(&vc->buf);

  148.     av_freep(&vc->buf_tmp);

  149. 

  150.     av_freep(&vc->residues);

  151.     av_freep(&vc->modes);

  152. 

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

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

  155. 

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

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

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

  159.     }

  160.     av_freep(&vc->codebooks);

  161. 

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

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

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

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

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

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

  168.         }

  169.         else {

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

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

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

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

  174.         }

  175.     }

  176.     av_freep(&vc->floors);

  177. 

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

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

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

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

  182.     }

  183.     av_freep(&vc->mappings);

  184. 

  185.     if(vc->exp_bias){

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

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

  188.     }

  189. }

  190. 

  191. // Parse setup header -------------------------------------------------

  192. 

  193. // Process codebooks part

  194. 

  195. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {

  196.     uint_fast16_t cb;

  197.     uint_fast8_t *tmp_vlc_bits;

  198.     uint_fast32_t *tmp_vlc_codes;

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

  200. 

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

  202. 

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

  204. 

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

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

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

  208. 

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

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

  211.         uint_fast8_t ordered;

  212.         uint_fast32_t t, used_entries=0;

  213.         uint_fast32_t entries;

  214. 

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

  216. 

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

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

  219.             goto error;

  220.         }

  221. 

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

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

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

  225.             goto error;

  226.         }

  227.         entries=get_bits(gb, 24);

  228.         if (entries>V_MAX_VLCS) {

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

  230.             goto error;

  231.         }

  232. 

  233.         ordered=get_bits1(gb);

  234. 

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

  236. 

  237.         if (!ordered) {

  238.             uint_fast16_t ce;

  239.             uint_fast8_t flag;

  240.             uint_fast8_t sparse=get_bits1(gb);

  241. 

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

  243. 

  244.             if (sparse) {

  245.                 AV_DEBUG(" sparse \n");

  246. 

  247.                 used_entries=0;

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

  249.                     flag=get_bits1(gb);

  250.                     if (flag) {

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

  252.                         ++used_entries;

  253.                     }

  254.                     else tmp_vlc_bits[ce]=0;

  255.                 }

  256.             } else {

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

  258. 

  259.                 used_entries=entries;

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

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

  262.                 }

  263.             }

  264.         } else {

  265.             uint_fast16_t current_entry=0;

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

  267. 

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

  269. 

  270.             used_entries=entries;

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

  272.                 uint_fast16_t i, number;

  273. 

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

  275. 

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

  277. 

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

  279. 

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

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

  282.                 }

  283. 

  284.                 current_entry+=number;

  285.             }

  286.             if (current_entry>used_entries) {

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

  288.                 goto error;

  289.             }

  290.         }

  291. 

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

  293. 

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

  295. 

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

  297. 

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

  299.             uint_fast16_t i, j, k;

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

  301.             uint_fast16_t codebook_multiplicands[codebook_lookup_values];

  302. 

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

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

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

  306.             uint_fast8_t codebook_sequence_p=get_bits1(gb);

  307. 

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

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

  310. 

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

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

  313. 

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

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

  316.             }

  317. 

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

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

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

  321.                 uint_fast8_t dim=codebook_setup->dimensions;

  322. 

  323.                 if (tmp_vlc_bits[i]) {

  324.                     float last=0.0;

  325.                     uint_fast32_t lookup_offset=i;

  326. 

  327. #ifdef V_DEBUG

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

  329. #endif

  330. 

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

  332.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  334.                         if (codebook_sequence_p) {

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

  336.                         }

  337.                         lookup_offset/=codebook_lookup_values;

  338.                     }

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

  340. 

  341. #ifdef V_DEBUG

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

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

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

  345.                     }

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

  347. #endif

  348. 

  349.                     ++j;

  350.                 }

  351.             }

  352.             if (j!=used_entries) {

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

  354.                 goto error;

  355.             }

  356.             entries=used_entries;

  357.         }

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

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

  360.             goto error;

  361.         }

  362. 

  363. // Initialize VLC table

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

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

  366.             goto error;

  367.         }

  368.         codebook_setup->maxdepth=0;

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

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

  371. 

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

  373.         else                                       codebook_setup->nb_bits=V_NB_BITS;

  374. 

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

  376. 

  377.         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)) {

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

  379.             goto error;

  380.         }

  381.     }

  382. 

  383.     av_free(tmp_vlc_bits);

  384.     av_free(tmp_vlc_codes);

  385.     return 0;

  386. 

  387. // Error:

  388. error:

  389.     av_free(tmp_vlc_bits);

  390.     av_free(tmp_vlc_codes);

  391.     return 1;

  392. }

  393. 

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

  395. 

  396. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {

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

  398.     uint_fast8_t i;

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

  400. 

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

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

  403. 

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

  405. 

  406.         if (vorbis_tdtransform) {

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

  408.             return 1;

  409.         }

  410.     }

  411.     return 0;

  412. }

  413. 

  414. // Process floors part

  415. 

  416. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  417.                                          vorbis_floor_data *vfu, float *vec);

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

  419. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  420.                                          vorbis_floor_data *vfu, float *vec);

  421. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {

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

  423.     uint_fast16_t i,j,k;

  424. 

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

  426. 

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

  428. 

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

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

  431. 

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

  433. 

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

  435. 

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

  437.             uint_fast8_t maximum_class=0;

  438.             uint_fast8_t rangebits;

  439.             uint_fast16_t floor1_values=2;

  440. 

  441.             floor_setup->decode=vorbis_floor1_decode;

  442. 

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

  444. 

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

  446. 

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

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

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

  450. 

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

  452. 

  453.             }

  454. 

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

  456. 

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

  458. 

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

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

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

  462. 

  463.                 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]);

  464. 

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

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

  467. 

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

  469.                 }

  470. 

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

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

  473. 

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

  475.                 }

  476.             }

  477. 

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

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

  480. 

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

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

  483.             }

  484. 

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

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

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

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

  489. 

  490. 

  491.             rangebits=get_bits(gb, 4);

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

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

  494. 

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

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

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

  498. 

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

  500.                 }

  501.             }

  502. 

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

  504. 

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

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

  507.             }

  508. 

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

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

  511.                     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]]) {

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

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

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

  515.                     }

  516.                 }

  517.             }

  518. 

  519. // Precalculate low and high neighbours

  520. 

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

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

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

  524. 

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

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

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

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

  529.                     }

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

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

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

  533.                     }

  534.                 }

  535.             }

  536.         }

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

  538.             uint_fast8_t max_codebook_dim=0;

  539. 

  540.             floor_setup->decode=vorbis_floor0_decode;

  541. 

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

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

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

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

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

  547.              * 2^0 - 1 == 0                             */

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

  549.               av_log(vc->avccontext, AV_LOG_ERROR,

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

  551.               return 1;

  552.             }

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

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

  555. 

  556.             /* allocate mem for booklist */

  557.             floor_setup->data.t0.book_list=

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

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

  560.             /* read book indexes */

  561.             {

  562.                 int idx;

  563.                 uint_fast8_t book_idx;

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

  565.                     book_idx=get_bits(gb, 8);

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

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

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

  569. 

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

  571.                         return 1;

  572.                 }

  573.             }

  574. 

  575.             create_map( vc, i );

  576. 

  577.             /* allocate mem for lsp coefficients */

  578.             {

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

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

  581.                 floor_setup->data.t0.lsp=

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

  583.                               * sizeof(float));

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

  585.             }

  586. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  600.             {

  601.               int idx;

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

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

  604.                   idx+1,

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

  606.               }

  607.             }

  608. #endif

  609.         }

  610.         else {

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

  612.             return 1;

  613.         }

  614.     }

  615.     return 0;

  616. }

  617. 

  618. // Process residues part

  619. 

  620. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){

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

  622.     uint_fast8_t i, j, k;

  623. 

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

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

  626. 

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

  628. 

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

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

  631.         uint_fast8_t cascade[64];

  632.         uint_fast8_t high_bits;

  633.         uint_fast8_t low_bits;

  634. 

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

  636. 

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

  638. 

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

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

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

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

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

  644. 

  645.         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,

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

  647. 

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

  649.             high_bits=0;

  650.             low_bits=get_bits(gb, 3);

  651.             if (get_bits1(gb)) {

  652.                 high_bits=get_bits(gb, 5);

  653.             }

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

  655. 

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

  657.         }

  658. 

  659.         res_setup->maxpass=0;

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

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

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

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

  664. 

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

  666. 

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

  668.                         res_setup->maxpass=k;

  669.                     }

  670.                 } else {

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

  672.                 }

  673.             }

  674.         }

  675.     }

  676.     return 0;

  677. }

  678. 

  679. // Process mappings part

  680. 

  681. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {

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

  683.     uint_fast8_t i, j;

  684. 

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

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

  687. 

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

  689. 

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

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

  692. 

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

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

  695.             return 1;

  696.         }

  697.         if (get_bits1(gb)) {

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

  699.         } else {

  700.             mapping_setup->submaps=1;

  701.         }

  702. 

  703.         if (get_bits1(gb)) {

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

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

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

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

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

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

  710.                 // FIXME: sanity checks

  711.             }

  712.         } else {

  713.             mapping_setup->coupling_steps=0;

  714.         }

  715. 

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

  717. 

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

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

  720.             return 1; // following spec.

  721.         }

  722. 

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

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

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

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

  727.             }

  728.         }

  729. 

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

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

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

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

  734. 

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

  736.         }

  737.     }

  738.     return 0;

  739. }

  740. 

  741. // Process modes part

  742. 

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

  744. {

  745.     vorbis_floor * floors=vc->floors;

  746.     vorbis_floor0 * vf;

  747.     int idx;

  748.     int_fast8_t blockflag;

  749.     int_fast32_t * map;

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

  751. 

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

  753.     {

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

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

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

  757. 

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

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

  760. 

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

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

  763.                               ((vf->bark_map_size)/

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

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

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

  767.         }

  768.     }

  769.     map[n]=-1;

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

  771.     }

  772. 

  773. #   ifdef V_DEBUG

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

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

  776.                  idx, map[idx]);

  777.     }

  778. #   endif

  779. }

  780. 

  781. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {

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

  783.     uint_fast8_t i;

  784. 

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

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

  787. 

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

  789. 

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

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

  792. 

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

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

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

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

  797. 

  798.         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);

  799.     }

  800.     return 0;

  801. }

  802. 

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

  804. 

  805. static int vorbis_parse_setup_hdr(vorbis_context *vc) {

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

  807. 

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

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

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

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

  812.         return 1;

  813.     }

  814. 

  815.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  817.         return 2;

  818.     }

  819.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  821.         return 3;

  822.     }

  823.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  825.         return 4;

  826.     }

  827.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  829.         return 5;

  830.     }

  831.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  833.         return 6;

  834.     }

  835.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  837.         return 7;

  838.     }

  839.     if (!get_bits1(gb)) {

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

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

  842.     }

  843. 

  844.     return 0;

  845. }

  846. 

  847. // Process the identification header

  848. 

  849. static int vorbis_parse_id_hdr(vorbis_context *vc){

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

  851.     uint_fast8_t bl0, bl1;

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

  853. 

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

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

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

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

  858.         return 1;

  859.     }

  860. 

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

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

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

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

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

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

  867.     bl0=get_bits(gb, 4);

  868.     bl1=get_bits(gb, 4);

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

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

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

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

  873.         return 3;

  874.     }

  875.     // output format int16

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

  877.                                              AVCODEC_MAX_AUDIO_FRAME_SIZE) {

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

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

  880.         return 4;

  881.     }

  882.     vc->win[0]=vwin[bl0-6];

  883.     vc->win[1]=vwin[bl1-6];

  884. 

  885.     if(vc->exp_bias){

  886.         int i, j;

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

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

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

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

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

  892.         }

  893.     }

  894. 

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

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

  897.         return 2;

  898.     }

  899. 

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

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

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

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

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

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

  906.     vc->saved_start=0;

  907. 

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

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

  910. 

  911.     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 ",

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

  913. 

  914. /*

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

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

  917.         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)));

  918.     }

  919. */

  920. 

  921.     return 0;

  922. }

  923. 

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

  925. 

  926. static int vorbis_decode_init(AVCodecContext *avccontext) {

  927.     vorbis_context *vc = avccontext->priv_data ;

  928.     uint8_t *headers = avccontext->extradata;

  929.     int headers_len=avccontext->extradata_size;

  930.     uint8_t *header_start[3];

  931.     int header_len[3];

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

  933.     int i, j, hdr_type;

  934. 

  935.     vc->avccontext = avccontext;

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

  937. 

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

  939.         vc->add_bias = 385;

  940.         vc->exp_bias = 0;

  941.     } else {

  942.         vc->add_bias = 0;

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

  944.     }

  945. 

  946.     if (!headers_len) {

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

  948.         return -1;

  949.     }

  950. 

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

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

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

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

  955.             header_start[i] = headers;

  956.             headers += header_len[i];

  957.         }

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

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

  960.             header_len[i]=0;

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

  962.                 header_len[i]+=0xff;

  963.                 ++j;

  964.             }

  965.             if (j>=headers_len) {

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

  967.                 return -1;

  968.             }

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

  970.         }

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

  972.         headers+=j;

  973.         header_start[0] = headers;

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

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

  976.     } else {

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

  978.         return -1;

  979.     }

  980. 

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

  982.     hdr_type=get_bits(gb, 8);

  983.     if (hdr_type!=1) {

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

  985.         return -1;

  986.     }

  987.     if (vorbis_parse_id_hdr(vc)) {

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

  989.         vorbis_free(vc);

  990.         return -1;

  991.     }

  992. 

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

  994.     hdr_type=get_bits(gb, 8);

  995.     if (hdr_type!=5) {

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

  997.         return -1;

  998.     }

  999.     if (vorbis_parse_setup_hdr(vc)) {

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

  1001.         vorbis_free(vc);

  1002.         return -1;

  1003.     }

  1004. 

  1005.     avccontext->channels = vc->audio_channels;

  1006.     avccontext->sample_rate = vc->audio_samplerate;

  1007. 

  1008.     return 0 ;

  1009. }

  1010. 

  1011. // Decode audiopackets -------------------------------------------------

  1012. 

  1013. // Read and decode floor

  1014. 

  1015. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  1016.                                          vorbis_floor_data *vfu, float *vec) {

  1017.     vorbis_floor0 * vf=&vfu->t0;

  1018.     float * lsp=vf->lsp;

  1019.     uint_fast32_t amplitude;

  1020.     uint_fast32_t book_idx;

  1021.     uint_fast8_t blockflag=vc->modes[vc->mode_number].blockflag;

  1022. 

  1023.     amplitude=get_bits(&vc->gb, vf->amplitude_bits);

  1024.     if (amplitude>0) {

  1025.         float last = 0;

  1026.         uint_fast16_t lsp_len = 0;

  1027.         uint_fast16_t idx;

  1028.         vorbis_codebook codebook;

  1029. 

  1030.         book_idx=get_bits(&vc->gb, ilog(vf->num_books));

  1031.         if ( book_idx >= vf->num_books ) {

  1032.             av_log( vc->avccontext, AV_LOG_ERROR,

  1033.                     "floor0 dec: booknumber too high!\n" );

  1034.             //FIXME: look above

  1035.         }

  1036.         AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );

  1037.         codebook=vc->codebooks[vf->book_list[book_idx]];

  1038. 

  1039.         while (lsp_len<vf->order) {

  1040.             int vec_off;

  1041. 

  1042.             AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );

  1043.             AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );

  1044.             /* read temp vector */

  1045.             vec_off=get_vlc2(&vc->gb,

  1046.                              codebook.vlc.table,

  1047.                              codebook.nb_bits,

  1048.                              codebook.maxdepth ) *

  1049.                              codebook.dimensions;

  1050.             AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );

  1051.             /* copy each vector component and add last to it */

  1052.             for (idx=0; idx<codebook.dimensions; ++idx) {

  1053.                 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;

  1054.             }

  1055.             last=lsp[lsp_len+idx-1]; /* set last to last vector component */

  1056. 

  1057.             lsp_len += codebook.dimensions;

  1058.         }

  1059. #ifdef V_DEBUG

  1060.         /* DEBUG: output lsp coeffs */

  1061.         {

  1062.             int idx;

  1063.             for ( idx = 0; idx < lsp_len; ++idx )

  1064.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );

  1065.         }

  1066. #endif

  1067. 

  1068.         /* synthesize floor output vector */

  1069.         {

  1070.             int i;

  1071.             int order=vf->order;

  1072.             float wstep=M_PI/vf->bark_map_size;

  1073. 

  1074.             for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }

  1075. 

  1076.             AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",

  1077.                      vf->map_size, order, wstep);

  1078. 

  1079.             i=0;

  1080.             while(i<vf->map_size[blockflag]) {

  1081.                 int j, iter_cond=vf->map[blockflag][i];

  1082.                 float p=0.5f;

  1083.                 float q=0.5f;

  1084.                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times

  1085. 

  1086.                 /* similar part for the q and p products */

  1087.                 for(j=0;j<order;j+=2) {

  1088.                     q *= lsp[j]  -two_cos_w;

  1089.                     p *= lsp[j+1]-two_cos_w;

  1090.                 }

  1091.                 if(j==order) { // even order

  1092.                     p *= p*(2.0f-two_cos_w);

  1093.                     q *= q*(2.0f+two_cos_w);

  1094.                 }

  1095.                 else { // odd order

  1096.                     q *= two_cos_w-lsp[j]; // one more time for q

  1097. 

  1098.                     /* final step and square */

  1099.                     p *= p*(4.f-two_cos_w*two_cos_w);

  1100.                     q *= q;

  1101.                 }

  1102. 

  1103.                 /* calculate linear floor value */

  1104.                 {

  1105.                     q=exp( (

  1106.                              ( (amplitude*vf->amplitude_offset)/

  1107.                                (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )

  1108.                              - vf->amplitude_offset ) * .11512925f

  1109.                          );

  1110.                 }

  1111. 

  1112.                 /* fill vector */

  1113.                 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);

  1114.             }

  1115.         }

  1116.     }

  1117.     else {

  1118.         /* this channel is unused */

  1119.         return 1;

  1120.     }

  1121. 

  1122.     AV_DEBUG(" Floor0 decoded\n");

  1123. 

  1124.     return 0;

  1125. }

  1126. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {

  1127.     vorbis_floor1 * vf=&vfu->t1;

  1128.     GetBitContext *gb=&vc->gb;

  1129.     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };

  1130.     uint_fast16_t range=range_v[vf->multiplier-1];

  1131.     uint_fast16_t floor1_Y[vf->x_list_dim];

  1132.     uint_fast16_t floor1_Y_final[vf->x_list_dim];

  1133.     uint_fast8_t floor1_flag[vf->x_list_dim];

  1134.     uint_fast8_t class_;

  1135.     uint_fast8_t cdim;

  1136.     uint_fast8_t cbits;

  1137.     uint_fast8_t csub;

  1138.     uint_fast8_t cval;

  1139.     int_fast16_t book;

  1140.     uint_fast16_t offset;

  1141.     uint_fast16_t i,j;

  1142.     uint_fast16_t *floor_x_sort=vf->x_list_order;

  1143.     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?

  1144.     int_fast16_t dy, err;

  1145.     uint_fast16_t lx,hx, ly, hy=0;

  1146. 

  1147. 

  1148.     if (!get_bits1(gb)) return 1; // silence

  1149. 

  1150. // Read values (or differences) for the floor's points

  1151. 

  1152.     floor1_Y[0]=get_bits(gb, ilog(range-1));

  1153.     floor1_Y[1]=get_bits(gb, ilog(range-1));

  1154. 

  1155.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1156. 

  1157.     offset=2;

  1158.     for(i=0;i<vf->partitions;++i) {

  1159.         class_=vf->partition_class[i];

  1160.         cdim=vf->class_dimensions[class_];

  1161.         cbits=vf->class_subclasses[class_];

  1162.         csub=(1<<cbits)-1;

  1163.         cval=0;

  1164. 

  1165.         AV_DEBUG("Cbits %d \n", cbits);

  1166. 

  1167.         if (cbits) { // this reads all subclasses for this partition's class

  1168.             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,

  1169.             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);

  1170.         }

  1171. 

  1172.         for(j=0;j<cdim;++j) {

  1173.             book=vf->subclass_books[class_][cval & csub];

  1174. 

  1175.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1176. 

  1177.             cval=cval>>cbits;

  1178.             if (book>-1) {

  1179.                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,

  1180.                 vc->codebooks[book].nb_bits, 3);

  1181.             } else {

  1182.                 floor1_Y[offset+j]=0;

  1183.             }

  1184. 

  1185.             AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);

  1186.         }

  1187.         offset+=cdim;

  1188.     }

  1189. 

  1190. // Amplitude calculation from the differences

  1191. 

  1192.     floor1_flag[0]=1;

  1193.     floor1_flag[1]=1;

  1194.     floor1_Y_final[0]=floor1_Y[0];

  1195.     floor1_Y_final[1]=floor1_Y[1];

  1196. 

  1197.     for(i=2;i<vf->x_list_dim;++i) {

  1198.         uint_fast16_t val, highroom, lowroom, room;

  1199.         uint_fast16_t high_neigh_offs;

  1200.         uint_fast16_t low_neigh_offs;

  1201. 

  1202.         low_neigh_offs=vf->low_neighbour[i];

  1203.         high_neigh_offs=vf->high_neighbour[i];

  1204.         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin

  1205.         adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];

  1206.         ady= ABS(dy);

  1207.         err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);

  1208.         off=(int16_t)err/(int16_t)adx;

  1209.         if (dy<0) {

  1210.             predicted=floor1_Y_final[low_neigh_offs]-off;

  1211.         } else {

  1212.             predicted=floor1_Y_final[low_neigh_offs]+off;

  1213.         } // render_point end

  1214. 

  1215.         val=floor1_Y[i];

  1216.         highroom=range-predicted;

  1217.         lowroom=predicted;

  1218.         if (highroom < lowroom) {

  1219.             room=highroom*2;

  1220.         } else {

  1221.             room=lowroom*2;   // SPEC mispelling

  1222.         }

  1223.         if (val) {

  1224.             floor1_flag[low_neigh_offs]=1;

  1225.             floor1_flag[high_neigh_offs]=1;

  1226.             floor1_flag[i]=1;

  1227.             if (val>=room) {

  1228.                 if (highroom > lowroom) {

  1229.                     floor1_Y_final[i]=val-lowroom+predicted;

  1230.                 } else {

  1231.                     floor1_Y_final[i]=predicted-val+highroom-1;

  1232.                 }

  1233.             } else {

  1234.                 if (val & 1) {

  1235.                     floor1_Y_final[i]=predicted-(val+1)/2;

  1236.                 } else {

  1237.                     floor1_Y_final[i]=predicted+val/2;

  1238.                 }

  1239.             }

  1240.         } else {

  1241.             floor1_flag[i]=0;

  1242.             floor1_Y_final[i]=predicted;

  1243.         }

  1244. 

  1245.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);

  1246.     }

  1247. 

  1248. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1249. 

  1250.     hx=0;

  1251.     lx=0;

  1252.     ly=floor1_Y_final[0]*vf->multiplier;  // conforms to SPEC

  1253. 

  1254.     vec[0]=floor1_inverse_db_table[ly];

  1255. 

  1256.     for(i=1;i<vf->x_list_dim;++i) {

  1257.         AV_DEBUG(" Looking at post %d \n", i);

  1258. 

  1259.         if (floor1_flag[floor_x_sort[i]]) {   // SPEC mispelled

  1260.             int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2  base = 2blablabla ?????

  1261. 

  1262.             hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;

  1263.             hx=vf->x_list[floor_x_sort[i]];

  1264. 

  1265.             dy=hy-ly;

  1266.             adx=hx-lx;

  1267.             ady= (dy<0) ? -dy:dy;//ABS(dy);

  1268.             base=(int16_t)dy/(int16_t)adx;

  1269. 

  1270.             AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);

  1271. 

  1272.             x=lx;

  1273.             y=ly;

  1274.             err=0;

  1275.             if (dy<0) {

  1276.                 sy=base-1;

  1277.             } else {

  1278.                 sy=base+1;

  1279.             }

  1280.             ady=ady-(base<0 ? -base : base)*adx;

  1281.             vec[x]=floor1_inverse_db_table[y];

  1282. 

  1283.             AV_DEBUG(" vec[ %d ] = %d \n", x, y);

  1284. 

  1285.             for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {

  1286.                 err+=ady;

  1287.                 if (err>=adx) {

  1288.                     err-=adx;

  1289.                     y+=sy;

  1290.                 } else {

  1291.                     y+=base;

  1292.                 }

  1293.                 vec[x]=floor1_inverse_db_table[y];

  1294. 

  1295.                 AV_DEBUG(" vec[ %d ] = %d \n", x, y);

  1296.             }

  1297. 

  1298. /*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point

  1299.                 dy=hy-ly;

  1300.                 adx=hx-lx;

  1301.                 ady= dy<0 ? -dy : dy;

  1302.                 err=ady*j;

  1303.                 off=err/adx;

  1304.                 if (dy<0) {

  1305.                     predicted=ly-off;

  1306.                 } else {

  1307.                     predicted=ly+off;

  1308.                 }

  1309.                 if (lx+j < vf->x_list[1]) {

  1310.                     vec[lx+j]=floor1_inverse_db_table[predicted];

  1311.                 }

  1312.             }*/

  1313. 

  1314.             lx=hx;

  1315.             ly=hy;

  1316.         }

  1317.     }

  1318. 

  1319.     if (hx<vf->x_list[1]) {

  1320.         for(i=hx;i<vf->x_list[1];++i) {

  1321.             vec[i]=floor1_inverse_db_table[hy];

  1322.         }

  1323.     }

  1324. 

  1325.     AV_DEBUG(" Floor decoded\n");

  1326. 

  1327.     return 0;

  1328. }

  1329. 

  1330. // Read and decode residue

  1331. 

  1332. 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) {

  1333.     GetBitContext *gb=&vc->gb;

  1334.     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;

  1335.     uint_fast16_t n_to_read=vr->end-vr->begin;

  1336.     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;

  1337.     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];

  1338.     uint_fast8_t pass;

  1339.     uint_fast8_t ch_used;

  1340.     uint_fast8_t i,j,l;

  1341.     uint_fast16_t k;

  1342. 

  1343.     if (vr->type==2) {

  1344.         for(j=1;j<ch;++j) {

  1345.                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input

  1346.         }

  1347.         if (do_not_decode[0]) return 0;

  1348.         ch_used=1;

  1349.     } else {

  1350.         ch_used=ch;

  1351.     }

  1352. 

  1353.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1354. 

  1355.     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?

  1356.         uint_fast16_t voffset;

  1357.         uint_fast16_t partition_count;

  1358.         uint_fast16_t j_times_ptns_to_read;

  1359. 

  1360.         voffset=vr->begin;

  1361.         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error

  1362.             if (!pass) {

  1363.                 uint_fast32_t inverse_class = inverse[vr->classifications];

  1364.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1365.                     if (!do_not_decode[j]) {

  1366.                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1367.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1368. 

  1369.                         AV_DEBUG("Classword: %d \n", temp);

  1370. 

  1371.                         assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]

  1372.                         for(i=0;i<c_p_c;++i) {

  1373.                             uint_fast32_t temp2;

  1374. 

  1375.                             temp2=(((uint_fast64_t)temp) * inverse_class)>>32;

  1376.                             if (partition_count+c_p_c-1-i < ptns_to_read) {

  1377.                                 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;

  1378.                             }

  1379.                             temp=temp2;

  1380.                         }

  1381.                     }

  1382.                     j_times_ptns_to_read+=ptns_to_read;

  1383.                 }

  1384.             }

  1385.             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {

  1386.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1387.                     uint_fast16_t voffs;

  1388. 

  1389.                     if (!do_not_decode[j]) {

  1390.                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];

  1391.                         int_fast16_t vqbook=vr->books[vqclass][pass];

  1392. 

  1393.                         if (vqbook>=0) {

  1394.                             uint_fast16_t coffs;

  1395.                             unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64

  1396.                             uint_fast16_t step= dim==1 ? vr->partition_size

  1397.                                               : FASTDIV(vr->partition_size, dim);

  1398.                             vorbis_codebook codebook= vc->codebooks[vqbook];

  1399. 

  1400.                             if (vr->type==0) {

  1401. 

  1402.                                 voffs=voffset+j*vlen;

  1403.                                 for(k=0;k<step;++k) {

  1404.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1405.                                     for(l=0;l<dim;++l) {

  1406.                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH

  1407.                                     }

  1408.                                 }

  1409.                             }

  1410.                             else if (vr->type==1) {

  1411.                                 voffs=voffset+j*vlen;

  1412.                                 for(k=0;k<step;++k) {

  1413.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1414.                                     for(l=0;l<dim;++l, ++voffs) {

  1415.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1416. 

  1417.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1418.                                     }

  1419.                                 }

  1420.                             }

  1421.                             else if (vr->type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized

  1422.                                 voffs=voffset>>1;

  1423. 

  1424.                                 if(dim==2) {

  1425.                                     for(k=0;k<step;++k) {

  1426.                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1427.                                         vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH

  1428.                                         vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH

  1429.                                     }

  1430.                                 } else

  1431.                                 for(k=0;k<step;++k) {

  1432.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1433.                                     for(l=0;l<dim;l+=2, voffs++) {

  1434.                                         vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH

  1435.                                         vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH

  1436. 

  1437.                                         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);

  1438.                                     }

  1439.                                 }

  1440. 

  1441.                             }

  1442.                             else if (vr->type==2) {

  1443.                                 voffs=voffset;

  1444. 

  1445.                                 for(k=0;k<step;++k) {

  1446.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1447.                                     for(l=0;l<dim;++l, ++voffs) {

  1448.                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %

  1449. 

  1450.                                         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);

  1451.                                     }

  1452.                                 }

  1453.                             } else {

  1454.                                 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1455.                                 return 1;

  1456.                             }

  1457.                         }

  1458.                     }

  1459.                     j_times_ptns_to_read+=ptns_to_read;

  1460.                 }

  1461.                 ++partition_count;

  1462.                 voffset+=vr->partition_size;

  1463.             }

  1464.         }

  1465.     }

  1466.     return 0;

  1467. }

  1468. 

  1469. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1470. {

  1471.     int i;

  1472.     for(i=0; i<blocksize; i++)

  1473.     {

  1474.         if (mag[i]>0.0) {

  1475.             if (ang[i]>0.0) {

  1476.                 ang[i]=mag[i]-ang[i];

  1477.             } else {

  1478.                 float temp=ang[i];

  1479.                 ang[i]=mag[i];

  1480.                 mag[i]+=temp;

  1481.             }

  1482.         } else {

  1483.             if (ang[i]>0.0) {

  1484.                 ang[i]+=mag[i];

  1485.             } else {

  1486.                 float temp=ang[i];

  1487.                 ang[i]=mag[i];

  1488.                 mag[i]-=temp;

  1489.             }

  1490.         }

  1491.     }

  1492. }

  1493. 

  1494. // Decode the audio packet using the functions above

  1495. 

  1496. static int vorbis_parse_audio_packet(vorbis_context *vc) {

  1497.     GetBitContext *gb=&vc->gb;

  1498. 

  1499.     uint_fast8_t previous_window=0,next_window=0;

  1500.     uint_fast8_t mode_number;

  1501.     uint_fast16_t blocksize;

  1502.     int_fast32_t i,j;

  1503.     uint_fast8_t no_residue[vc->audio_channels];

  1504.     uint_fast8_t do_not_decode[vc->audio_channels];

  1505.     vorbis_mapping *mapping;

  1506.     float *ch_res_ptr=vc->channel_residues;

  1507.     float *ch_floor_ptr=vc->channel_floors;

  1508.     uint_fast8_t res_chan[vc->audio_channels];

  1509.     uint_fast8_t res_num=0;

  1510.     int_fast16_t retlen=0;

  1511.     uint_fast16_t saved_start=0;

  1512.     float fadd_bias = vc->add_bias;

  1513. 

  1514.     if (get_bits1(gb)) {

  1515.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1516.         return -1; // packet type not audio

  1517.     }

  1518. 

  1519.     if (vc->mode_count==1) {

  1520.         mode_number=0;

  1521.     } else {

  1522.         mode_number=get_bits(gb, ilog(vc->mode_count-1));

  1523.     }

  1524.     vc->mode_number=mode_number;

  1525.     mapping=&vc->mappings[vc->modes[mode_number].mapping];

  1526. 

  1527.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1528. 

  1529.     if (vc->modes[mode_number].blockflag) {

  1530.         previous_window=get_bits1(gb);

  1531.         next_window=get_bits1(gb);

  1532.     }

  1533. 

  1534.     blocksize=vc->blocksize[vc->modes[mode_number].blockflag];

  1535.     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1536.     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1537. 

  1538. // Decode floor

  1539. 

  1540.     for(i=0;i<vc->audio_channels;++i) {

  1541.         vorbis_floor *floor;

  1542.         if (mapping->submaps>1) {

  1543.             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1544.         } else {

  1545.             floor=&vc->floors[mapping->submap_floor[0]];

  1546.         }

  1547. 

  1548.         no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);

  1549.         ch_floor_ptr+=blocksize/2;

  1550.     }

  1551. 

  1552. // Nonzero vector propagate

  1553. 

  1554.     for(i=mapping->coupling_steps-1;i>=0;--i) {

  1555.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1556.             no_residue[mapping->magnitude[i]]=0;

  1557.             no_residue[mapping->angle[i]]=0;

  1558.         }

  1559.     }

  1560. 

  1561. // Decode residue

  1562. 

  1563.     for(i=0;i<mapping->submaps;++i) {

  1564.         vorbis_residue *residue;

  1565.         uint_fast8_t ch=0;

  1566. 

  1567.         for(j=0;j<vc->audio_channels;++j) {

  1568.             if ((mapping->submaps==1) || (i=mapping->mux[j])) {

  1569.                 res_chan[j]=res_num;

  1570.                 if (no_residue[j]) {

  1571.                     do_not_decode[ch]=1;

  1572.                 } else {

  1573.                     do_not_decode[ch]=0;

  1574.                 }

  1575.                 ++ch;

  1576.                 ++res_num;

  1577.             }

  1578.         }

  1579.         residue=&vc->residues[mapping->submap_residue[i]];

  1580.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1581. 

  1582.         ch_res_ptr+=ch*blocksize/2;

  1583.     }

  1584. 

  1585. // Inverse coupling

  1586. 

  1587.     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed

  1588.         float *mag, *ang;

  1589. 

  1590.         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;

  1591.         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;

  1592.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);

  1593.     }

  1594. 

  1595. // Dotproduct

  1596. 

  1597.     for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {

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

  1599.         vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);

  1600.     }

  1601. 

  1602. // MDCT, overlap/add, save data for next overlapping  FPMATH

  1603. 

  1604.     for(j=0;j<vc->audio_channels;++j) {

  1605.         uint_fast8_t step=vc->audio_channels;

  1606.         uint_fast16_t k;

  1607.         float *saved=vc->saved+j*vc->blocksize[1]/2;

  1608.         float *ret=vc->ret;

  1609.         const float *lwin=vc->win[1];

  1610.         const float *swin=vc->win[0];

  1611.         float *buf=vc->buf;

  1612.         float *buf_tmp=vc->buf_tmp;

  1613. 

  1614.         ch_floor_ptr=vc->channel_floors+j*blocksize/2;

  1615. 

  1616.         saved_start=vc->saved_start;

  1617. 

  1618.         vc->mdct[0].fft.imdct_calc(&vc->mdct[vc->modes[mode_number].blockflag], buf, ch_floor_ptr, buf_tmp);

  1619. 

  1620.         //FIXME process channels together, to allow faster simd vector_fmul_add_add?

  1621.         if (vc->modes[mode_number].blockflag) {

  1622.             // -- overlap/add

  1623.             if (previous_window) {

  1624.                 vc->dsp.vector_fmul_add_add(ret+j, buf, lwin, saved, vc->add_bias, vc->blocksize[1]/2, step);

  1625.                 retlen=vc->blocksize[1]/2;

  1626.             } else {

  1627.                 int len = (vc->blocksize[1]-vc->blocksize[0])/4;

  1628.                 buf += len;

  1629.                 vc->dsp.vector_fmul_add_add(ret+j, buf, swin, saved, vc->add_bias, vc->blocksize[0]/2, step);

  1630.                 k = vc->blocksize[0]/2*step + j;

  1631.                 buf += vc->blocksize[0]/2;

  1632.                 if(vc->exp_bias){

  1633.                     for(i=0; i<len; i++, k+=step)

  1634.                         ((uint32_t*)ret)[k] = ((uint32_t*)buf)[i] + vc->exp_bias; // ret[k]=buf[i]*(1<<bias)

  1635.                 } else {

  1636.                     for(i=0; i<len; i++, k+=step)

  1637.                         ret[k] = buf[i] + fadd_bias;

  1638.                 }

  1639.                 buf=vc->buf;

  1640.                 retlen=vc->blocksize[0]/2+len;

  1641.             }

  1642.             // -- save

  1643.             if (next_window) {

  1644.                 buf += vc->blocksize[1]/2;

  1645.                 vc->dsp.vector_fmul_reverse(saved, buf, lwin, vc->blocksize[1]/2);

  1646.                 saved_start=0;

  1647.             } else {

  1648.                 saved_start=(vc->blocksize[1]-vc->blocksize[0])/4;

  1649.                 buf += vc->blocksize[1]/2;

  1650.                 for(i=0; i<saved_start; i++)

  1651.                     ((uint32_t*)saved)[i] = ((uint32_t*)buf)[i] + vc->exp_bias;

  1652.                 vc->dsp.vector_fmul_reverse(saved+saved_start, buf+saved_start, swin, vc->blocksize[0]/2);

  1653.             }

  1654.         } else {

  1655.             // --overlap/add

  1656.             if(vc->add_bias) {

  1657.                 for(k=j, i=0;i<saved_start;++i, k+=step)

  1658.                     ret[k] = saved[i] + fadd_bias;

  1659.             } else {

  1660.                 for(k=j, i=0;i<saved_start;++i, k+=step)

  1661.                     ret[k] = saved[i];

  1662.             }

  1663.             vc->dsp.vector_fmul_add_add(ret+k, buf, swin, saved+saved_start, vc->add_bias, vc->blocksize[0]/2, step);

  1664.             retlen=saved_start+vc->blocksize[0]/2;

  1665.             // -- save

  1666.             buf += vc->blocksize[0]/2;

  1667.             vc->dsp.vector_fmul_reverse(saved, buf, swin, vc->blocksize[0]/2);

  1668.             saved_start=0;

  1669.         }

  1670.     }

  1671.     vc->saved_start=saved_start;

  1672. 

  1673.     return retlen*vc->audio_channels;

  1674. }

  1675. 

  1676. // Return the decoded audio packet through the standard api

  1677. 

  1678. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1679.                         void *data, int *data_size,

  1680.                         uint8_t *buf, int buf_size)

  1681. {

  1682.     vorbis_context *vc = avccontext->priv_data ;

  1683.     GetBitContext *gb = &(vc->gb);

  1684. 

  1685.     int_fast16_t len;

  1686. 

  1687.     if(!buf_size){

  1688.         return 0;

  1689.     }

  1690. 

  1691.     AV_DEBUG("packet length %d \n", buf_size);

  1692. 

  1693.     init_get_bits(gb, buf, buf_size*8);

  1694. 

  1695.     len=vorbis_parse_audio_packet(vc);

  1696. 

  1697.     if (len<=0) {

  1698.         *data_size=0;

  1699.         return buf_size;

  1700.     }

  1701. 

  1702.     if (!vc->first_frame) {

  1703.         vc->first_frame=1;

  1704.         *data_size=0;

  1705.         return buf_size ;

  1706.     }

  1707. 

  1708.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1709. 

  1710.     vc->dsp.float_to_int16(data, vc->ret, len);

  1711.     *data_size=len*2;

  1712. 

  1713.     return buf_size ;

  1714. }

  1715. 

  1716. // Close decoder

  1717. 

  1718. static int vorbis_decode_close(AVCodecContext *avccontext) {

  1719.     vorbis_context *vc = avccontext->priv_data;

  1720. 

  1721.     vorbis_free(vc);

  1722. 

  1723.     return 0 ;

  1724. }

  1725. 

  1726. AVCodec vorbis_decoder = {

  1727.     "vorbis",

  1728.     CODEC_TYPE_AUDIO,

  1729.     CODEC_ID_VORBIS,

  1730.     sizeof(vorbis_context),

  1731.     vorbis_decode_init,

  1732.     NULL,

  1733.     vorbis_decode_close,

  1734.     vorbis_decode_frame,

  1735. };