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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. 

  24. #include <math.h>

  25. 

  26. #define ALT_BITSTREAM_READER_LE

  27. #include "avcodec.h"

  28. #include "bitstream.h"

  29. #include "dsputil.h"

  30. 

  31. #include "vorbis.h"

  32. 

  33. #define V_NB_BITS 8

  34. #define V_NB_BITS2 11

  35. #define V_MAX_VLCS (1<<16)

  36. 

  37. #ifndef V_DEBUG

  38. #define AV_DEBUG(...)

  39. #endif

  40. 

  41. #undef NDEBUG

  42. #include <assert.h>

  43. 

  44. /* Helper functions */

  45. 

  46. /**

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

  48.  */

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

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

  51.     else{

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

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

  54.     }

  55. }

  56. 

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

  58. 

  59. #define BARK(x) \

  60.     (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))

  61. 

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

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

  64. 

  65.     do {

  66.         ++ret;

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

  68.     } while (j<=x);

  69. 

  70.     return (ret-1);

  71. }

  72. 

  73. static float vorbisfloat2float(uint_fast32_t val) {

  74.     double mant=val&0x1fffff;

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

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

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

  78. }

  79. 

  80. 

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

  82. 

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

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

  85.         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

  86. 

  87.     uint_fast8_t i,j;

  88.     uint_fast32_t code,p;

  89. 

  90. #ifdef V_DEBUG

  91.     GetBitContext gb;

  92. #endif

  93. 

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

  95.     if (p==num) {

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

  97.         return 0;

  98.     }

  99. 

  100.     codes[p]=0;

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

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

  103.     }

  104. 

  105. #ifdef V_DEBUG

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

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

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

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

  110.     }

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

  112. #endif

  113. 

  114.     ++p;

  115. 

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

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

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

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

  120.             if (exit_at_level[i]) break;

  121.         }

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

  123.         code=exit_at_level[i];

  124.         exit_at_level[i]=0;

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

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

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

  128.         }

  129.         codes[p]=code;

  130. 

  131. #ifdef V_DEBUG

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

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

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

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

  136.         }

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

  138. #endif

  139. 

  140.     }

  141. 

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

  143. 

  144.     return 0;

  145. }

  146. 

  147. // Free all allocated memory -----------------------------------------

  148. 

  149. static void vorbis_free(vorbis_context *vc) {

  150.     int_fast16_t i;

  151. 

  152.     av_freep(&vc->channel_residues);

  153.     av_freep(&vc->channel_floors);

  154.     av_freep(&vc->saved);

  155.     av_freep(&vc->ret);

  156.     av_freep(&vc->buf);

  157.     av_freep(&vc->buf_tmp);

  158. 

  159.     av_freep(&vc->residues);

  160.     av_freep(&vc->modes);

  161. 

  162.     ff_mdct_end(&vc->mdct0);

  163.     ff_mdct_end(&vc->mdct1);

  164. 

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

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

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

  168.     }

  169.     av_freep(&vc->codebooks);

  170. 

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

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

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

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

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

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

  177.         }

  178.         else {

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

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

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

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

  183.         }

  184.     }

  185.     av_freep(&vc->floors);

  186. 

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

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

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

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

  191.     }

  192.     av_freep(&vc->mappings);

  193. }

  194. 

  195. // Parse setup header -------------------------------------------------

  196. 

  197. // Process codebooks part

  198. 

  199. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {

  200.     uint_fast16_t cb;

  201.     uint_fast8_t *tmp_vlc_bits;

  202.     uint_fast32_t *tmp_vlc_codes;

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

  204. 

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

  206. 

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

  208. 

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

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

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

  212. 

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

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

  215.         uint_fast8_t ordered;

  216.         uint_fast32_t t, used_entries=0;

  217.         uint_fast32_t entries;

  218. 

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

  220. 

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

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

  223.             goto error;

  224.         }

  225. 

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

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

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

  229.             goto error;

  230.         }

  231.         entries=get_bits(gb, 24);

  232.         if (entries>V_MAX_VLCS) {

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

  234.             goto error;

  235.         }

  236. 

  237.         ordered=get_bits1(gb);

  238. 

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

  240. 

  241.         if (!ordered) {

  242.             uint_fast16_t ce;

  243.             uint_fast8_t flag;

  244.             uint_fast8_t sparse=get_bits1(gb);

  245. 

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

  247. 

  248.             if (sparse) {

  249.                 AV_DEBUG(" sparse \n");

  250. 

  251.                 used_entries=0;

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

  253.                     flag=get_bits1(gb);

  254.                     if (flag) {

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

  256.                         ++used_entries;

  257.                     }

  258.                     else tmp_vlc_bits[ce]=0;

  259.                 }

  260.             } else {

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

  262. 

  263.                 used_entries=entries;

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

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

  266.                 }

  267.             }

  268.         } else {

  269.             uint_fast16_t current_entry=0;

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

  271. 

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

  273. 

  274.             used_entries=entries;

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

  276.                 uint_fast16_t i, number;

  277. 

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

  279. 

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

  281. 

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

  283. 

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

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

  286.                 }

  287. 

  288.                 current_entry+=number;

  289.             }

  290.             if (current_entry>used_entries) {

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

  292.                 goto error;

  293.             }

  294.         }

  295. 

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

  297. 

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

  299. 

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

  301. 

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

  303.             uint_fast16_t i, j, k;

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

  305.             uint_fast16_t codebook_multiplicands[codebook_lookup_values];

  306. 

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

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

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

  310.             uint_fast8_t codebook_sequence_p=get_bits1(gb);

  311. 

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

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

  314. 

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

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

  317. 

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

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

  320.             }

  321. 

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

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

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

  325.                 uint_fast8_t dim=codebook_setup->dimensions;

  326. 

  327.                 if (tmp_vlc_bits[i]) {

  328.                     float last=0.0;

  329.                     uint_fast32_t lookup_offset=i;

  330. 

  331. #ifdef V_DEBUG

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

  333. #endif

  334. 

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

  336.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  338.                         if (codebook_sequence_p) {

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

  340.                         }

  341.                         lookup_offset/=codebook_lookup_values;

  342.                     }

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

  344. 

  345. #ifdef V_DEBUG

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

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

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

  349.                     }

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

  351. #endif

  352. 

  353.                     ++j;

  354.                 }

  355.             }

  356.             if (j!=used_entries) {

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

  358.                 goto error;

  359.             }

  360.             entries=used_entries;

  361.         }

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

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

  364.             goto error;

  365.         }

  366. 

  367. // Initialize VLC table

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

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

  370.             goto error;

  371.         }

  372.         codebook_setup->maxdepth=0;

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

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

  375. 

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

  377.         else                                       codebook_setup->nb_bits=V_NB_BITS;

  378. 

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

  380. 

  381.         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)) {

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

  383.             goto error;

  384.         }

  385.     }

  386. 

  387.     av_free(tmp_vlc_bits);

  388.     av_free(tmp_vlc_codes);

  389.     return 0;

  390. 

  391. // Error:

  392. error:

  393.     av_free(tmp_vlc_bits);

  394.     av_free(tmp_vlc_codes);

  395.     return 1;

  396. }

  397. 

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

  399. 

  400. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {

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

  402.     uint_fast8_t i;

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

  404. 

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

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

  407. 

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

  409. 

  410.         if (vorbis_tdtransform) {

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

  412.             return 1;

  413.         }

  414.     }

  415.     return 0;

  416. }

  417. 

  418. // Process floors part

  419. 

  420. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  421.                                          vorbis_floor_data *vfu, float *vec);

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

  423. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  424.                                          vorbis_floor_data *vfu, float *vec);

  425. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {

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

  427.     uint_fast16_t i,j,k;

  428. 

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

  430. 

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

  432. 

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

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

  435. 

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

  437. 

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

  439. 

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

  441.             uint_fast8_t maximum_class=0;

  442.             uint_fast8_t rangebits;

  443.             uint_fast16_t floor1_values=2;

  444. 

  445.             floor_setup->decode=vorbis_floor1_decode;

  446. 

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

  448. 

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

  450. 

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

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

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

  454. 

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

  456. 

  457.             }

  458. 

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

  460. 

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

  462. 

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

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

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

  466. 

  467.                 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]);

  468. 

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

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

  471. 

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

  473.                 }

  474. 

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

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

  477. 

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

  479.                 }

  480.             }

  481. 

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

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

  484. 

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

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

  487.             }

  488. 

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

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

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

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

  493. 

  494. 

  495.             rangebits=get_bits(gb, 4);

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

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

  498. 

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

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

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

  502. 

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

  504.                 }

  505.             }

  506. 

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

  508. 

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

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

  511.             }

  512. 

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

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

  515.                     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]]) {

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

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

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

  519.                     }

  520.                 }

  521.             }

  522. 

  523. // Precalculate low and high neighbours

  524. 

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

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

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

  528. 

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

  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.low_neighbour[k]])) {

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

  533.                     }

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

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

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

  537.                     }

  538.                 }

  539.             }

  540.         }

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

  542.             uint_fast8_t max_codebook_dim=0;

  543. 

  544.             floor_setup->decode=vorbis_floor0_decode;

  545. 

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

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

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

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

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

  551.              * 2^0 - 1 == 0                             */

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

  553.               av_log(vc->avccontext, AV_LOG_ERROR,

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

  555.               return 1;

  556.             }

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

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

  559. 

  560.             /* allocate mem for booklist */

  561.             floor_setup->data.t0.book_list=

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

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

  564.             /* read book indexes */

  565.             {

  566.                 int idx;

  567.                 uint_fast8_t book_idx;

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

  569.                     book_idx=get_bits(gb, 8);

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

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

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

  573. 

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

  575.                         return 1;

  576.                 }

  577.             }

  578. 

  579.             create_map( vc, i );

  580. 

  581.             /* allocate mem for lsp coefficients */

  582.             {

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

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

  585.                 floor_setup->data.t0.lsp=

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

  587.                               * sizeof(float));

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

  589.             }

  590. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  604.             {

  605.               int idx;

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

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

  608.                   idx+1,

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

  610.               }

  611.             }

  612. #endif

  613.         }

  614.         else {

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

  616.             return 1;

  617.         }

  618.     }

  619.     return 0;

  620. }

  621. 

  622. // Process residues part

  623. 

  624. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){

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

  626.     uint_fast8_t i, j, k;

  627. 

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

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

  630. 

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

  632. 

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

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

  635.         uint_fast8_t cascade[64];

  636.         uint_fast8_t high_bits;

  637.         uint_fast8_t low_bits;

  638. 

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

  640. 

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

  642. 

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

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

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

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

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

  648. 

  649.         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,

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

  651. 

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

  653.             high_bits=0;

  654.             low_bits=get_bits(gb, 3);

  655.             if (get_bits1(gb)) {

  656.                 high_bits=get_bits(gb, 5);

  657.             }

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

  659. 

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

  661.         }

  662. 

  663.         res_setup->maxpass=0;

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

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

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

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

  668. 

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

  670. 

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

  672.                         res_setup->maxpass=k;

  673.                     }

  674.                 } else {

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

  676.                 }

  677.             }

  678.         }

  679.     }

  680.     return 0;

  681. }

  682. 

  683. // Process mappings part

  684. 

  685. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {

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

  687.     uint_fast8_t i, j;

  688. 

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

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

  691. 

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

  693. 

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

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

  696. 

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

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

  699.             return 1;

  700.         }

  701.         if (get_bits1(gb)) {

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

  703.         } else {

  704.             mapping_setup->submaps=1;

  705.         }

  706. 

  707.         if (get_bits1(gb)) {

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

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

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

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

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

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

  714.                 // FIXME: sanity checks

  715.             }

  716.         } else {

  717.             mapping_setup->coupling_steps=0;

  718.         }

  719. 

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

  721. 

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

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

  724.             return 1; // following spec.

  725.         }

  726. 

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

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

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

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

  731.             }

  732.         }

  733. 

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

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

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

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

  738. 

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

  740.         }

  741.     }

  742.     return 0;

  743. }

  744. 

  745. // Process modes part

  746. 

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

  748. {

  749.     vorbis_floor * floors=vc->floors;

  750.     vorbis_floor0 * vf;

  751.     int idx;

  752.     int_fast8_t blockflag;

  753.     int_fast32_t * map;

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

  755. 

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

  757.     {

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

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

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

  761. 

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

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

  764. 

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

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

  767.                               ((vf->bark_map_size)/

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

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

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

  771.         }

  772.     }

  773.     map[n]=-1;

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

  775.     }

  776. 

  777. #   ifdef V_DEBUG

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

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

  780.                  idx, map[idx]);

  781.     }

  782. #   endif

  783. }

  784. 

  785. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {

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

  787.     uint_fast8_t i;

  788. 

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

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

  791. 

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

  793. 

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

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

  796. 

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

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

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

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

  801. 

  802.         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);

  803.     }

  804.     return 0;

  805. }

  806. 

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

  808. 

  809. static int vorbis_parse_setup_hdr(vorbis_context *vc) {

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

  811. 

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

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

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

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

  816.         return 1;

  817.     }

  818. 

  819.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  821.         return 2;

  822.     }

  823.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  825.         return 3;

  826.     }

  827.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  829.         return 4;

  830.     }

  831.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  833.         return 5;

  834.     }

  835.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  837.         return 6;

  838.     }

  839.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  841.         return 7;

  842.     }

  843.     if (!get_bits1(gb)) {

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

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

  846.     }

  847. 

  848.     return 0;

  849. }

  850. 

  851. // Process the identification header

  852. 

  853. static int vorbis_parse_id_hdr(vorbis_context *vc){

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

  855.     uint_fast8_t bl0, bl1;

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

  857. 

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

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

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

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

  862.         return 1;

  863.     }

  864. 

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

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

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

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

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

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

  871.     bl0=get_bits(gb, 4);

  872.     bl1=get_bits(gb, 4);

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

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

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

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

  877.         return 3;

  878.     }

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

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

  881. 

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

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

  884.         return 2;

  885.     }

  886. 

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

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

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

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

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

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

  893.     vc->saved_start=0;

  894. 

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

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

  897. 

  898.     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 ",

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

  900. 

  901. /*

  902.     BLK=vc->blocksize_0;

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

  904.         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)));

  905.     }

  906. */

  907. 

  908.     return 0;

  909. }

  910. 

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

  912. 

  913. static int vorbis_decode_init(AVCodecContext *avccontext) {

  914.     vorbis_context *vc = avccontext->priv_data ;

  915.     uint8_t *headers = avccontext->extradata;

  916.     int headers_len=avccontext->extradata_size;

  917.     uint8_t *header_start[3];

  918.     int header_len[3];

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

  920.     int i, j, hdr_type;

  921. 

  922.     vc->avccontext = avccontext;

  923. 

  924.     if (!headers_len) {

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

  926.         return -1;

  927.     }

  928. 

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

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

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

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

  933.             header_start[i] = headers;

  934.             headers += header_len[i];

  935.         }

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

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

  938.             header_len[i]=0;

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

  940.                 header_len[i]+=0xff;

  941.                 ++j;

  942.             }

  943.             if (j>=headers_len) {

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

  945.                 return -1;

  946.             }

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

  948.         }

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

  950.         headers+=j;

  951.         header_start[0] = headers;

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

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

  954.     } else {

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

  956.         return -1;

  957.     }

  958. 

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

  960.     hdr_type=get_bits(gb, 8);

  961.     if (hdr_type!=1) {

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

  963.         return -1;

  964.     }

  965.     if (vorbis_parse_id_hdr(vc)) {

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

  967.         vorbis_free(vc);

  968.         return -1;

  969.     }

  970. 

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

  972.     hdr_type=get_bits(gb, 8);

  973.     if (hdr_type!=5) {

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

  975.         return -1;

  976.     }

  977.     if (vorbis_parse_setup_hdr(vc)) {

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

  979.         vorbis_free(vc);

  980.         return -1;

  981.     }

  982. 

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

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

  985. 

  986.     return 0 ;

  987. }

  988. 

  989. // Decode audiopackets -------------------------------------------------

  990. 

  991. // Read and decode floor

  992. 

  993. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  994.                                          vorbis_floor_data *vfu, float *vec) {

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

  996.     float * lsp=vf->lsp;

  997.     uint_fast32_t amplitude;

  998.     uint_fast32_t book_idx;

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

  1000. 

  1001.     amplitude=get_bits(&vc->gb, vf->amplitude_bits);

  1002.     if (amplitude>0) {

  1003.         float last = 0;

  1004.         uint_fast16_t lsp_len = 0;

  1005.         uint_fast16_t idx;

  1006.         vorbis_codebook codebook;

  1007. 

  1008.         book_idx=get_bits(&vc->gb, ilog(vf->num_books));

  1009.         if ( book_idx >= vf->num_books ) {

  1010.             av_log( vc->avccontext, AV_LOG_ERROR,

  1011.                     "floor0 dec: booknumber too high!\n" );

  1012.             //FIXME: look above

  1013.         }

  1014.         AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );

  1015.         codebook=vc->codebooks[vf->book_list[book_idx]];

  1016. 

  1017.         while (lsp_len<vf->order) {

  1018.             int vec_off;

  1019. 

  1020.             AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );

  1021.             AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );

  1022.             /* read temp vector */

  1023.             vec_off=get_vlc2(&vc->gb,

  1024.                              codebook.vlc.table,

  1025.                              codebook.nb_bits,

  1026.                              codebook.maxdepth ) *

  1027.                              codebook.dimensions;

  1028.             AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );

  1029.             /* copy each vector component and add last to it */

  1030.             for (idx=0; idx<codebook.dimensions; ++idx) {

  1031.                 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;

  1032.             }

  1033.             last=lsp[lsp_len+idx-1]; /* set last to last vector component */

  1034. 

  1035.             lsp_len += codebook.dimensions;

  1036.         }

  1037. #ifdef V_DEBUG

  1038.         /* DEBUG: output lsp coeffs */

  1039.         {

  1040.             int idx;

  1041.             for ( idx = 0; idx < lsp_len; ++idx )

  1042.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );

  1043.         }

  1044. #endif

  1045. 

  1046.         /* synthesize floor output vector */

  1047.         {

  1048.             int i;

  1049.             int order=vf->order;

  1050.             float wstep=M_PI/vf->bark_map_size;

  1051. 

  1052.             for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }

  1053. 

  1054.             AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",

  1055.                      vf->map_size, order, wstep);

  1056. 

  1057.             i=0;

  1058.             while(i<vf->map_size[blockflag]) {

  1059.                 int j, iter_cond=vf->map[blockflag][i];

  1060.                 float p=0.5f;

  1061.                 float q=0.5f;

  1062.                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times

  1063. 

  1064.                 /* similar part for the q and p products */

  1065.                 for(j=0;j<order;j+=2) {

  1066.                     q *= lsp[j]  -two_cos_w;

  1067.                     p *= lsp[j+1]-two_cos_w;

  1068.                 }

  1069.                 if(j==order) { // even order

  1070.                     p *= p*(2.0f-two_cos_w);

  1071.                     q *= q*(2.0f+two_cos_w);

  1072.                 }

  1073.                 else { // odd order

  1074.                     q *= two_cos_w-lsp[j]; // one more time for q

  1075. 

  1076.                     /* final step and square */

  1077.                     p *= p*(4.f-two_cos_w*two_cos_w);

  1078.                     q *= q;

  1079.                 }

  1080. 

  1081.                 /* calculate linear floor value */

  1082.                 {

  1083.                     q=exp( (

  1084.                              ( (amplitude*vf->amplitude_offset)/

  1085.                                (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )

  1086.                              - vf->amplitude_offset ) * .11512925f

  1087.                          );

  1088.                 }

  1089. 

  1090.                 /* fill vector */

  1091.                 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);

  1092.             }

  1093.         }

  1094.     }

  1095.     else {

  1096.         /* this channel is unused */

  1097.         return 1;

  1098.     }

  1099. 

  1100.     AV_DEBUG(" Floor0 decoded\n");

  1101. 

  1102.     return 0;

  1103. }

  1104. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor_data *vfu, float *vec) {

  1105.     vorbis_floor1 * vf=&vfu->t1;

  1106.     GetBitContext *gb=&vc->gb;

  1107.     uint_fast16_t range_v[4]={ 256, 128, 86, 64 };

  1108.     uint_fast16_t range=range_v[vf->multiplier-1];

  1109.     uint_fast16_t floor1_Y[vf->x_list_dim];

  1110.     uint_fast16_t floor1_Y_final[vf->x_list_dim];

  1111.     uint_fast8_t floor1_flag[vf->x_list_dim];

  1112.     uint_fast8_t class_;

  1113.     uint_fast8_t cdim;

  1114.     uint_fast8_t cbits;

  1115.     uint_fast8_t csub;

  1116.     uint_fast8_t cval;

  1117.     int_fast16_t book;

  1118.     uint_fast16_t offset;

  1119.     uint_fast16_t i,j;

  1120.     uint_fast16_t *floor_x_sort=vf->x_list_order;

  1121.     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?

  1122.     int_fast16_t dy, err;

  1123.     uint_fast16_t lx,hx, ly, hy=0;

  1124. 

  1125. 

  1126.     if (!get_bits1(gb)) return 1; // silence

  1127. 

  1128. // Read values (or differences) for the floor's points

  1129. 

  1130.     floor1_Y[0]=get_bits(gb, ilog(range-1));

  1131.     floor1_Y[1]=get_bits(gb, ilog(range-1));

  1132. 

  1133.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1134. 

  1135.     offset=2;

  1136.     for(i=0;i<vf->partitions;++i) {

  1137.         class_=vf->partition_class[i];

  1138.         cdim=vf->class_dimensions[class_];

  1139.         cbits=vf->class_subclasses[class_];

  1140.         csub=(1<<cbits)-1;

  1141.         cval=0;

  1142. 

  1143.         AV_DEBUG("Cbits %d \n", cbits);

  1144. 

  1145.         if (cbits) { // this reads all subclasses for this partition's class

  1146.             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,

  1147.             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);

  1148.         }

  1149. 

  1150.         for(j=0;j<cdim;++j) {

  1151.             book=vf->subclass_books[class_][cval & csub];

  1152. 

  1153.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1154. 

  1155.             cval=cval>>cbits;

  1156.             if (book>0) {

  1157.                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,

  1158.                 vc->codebooks[book].nb_bits, 3);

  1159.             } else {

  1160.                 floor1_Y[offset+j]=0;

  1161.             }

  1162. 

  1163.             AV_DEBUG(" floor(%d) = %d \n", vf->x_list[offset+j], floor1_Y[offset+j]);

  1164.         }

  1165.         offset+=cdim;

  1166.     }

  1167. 

  1168. // Amplitude calculation from the differences

  1169. 

  1170.     floor1_flag[0]=1;

  1171.     floor1_flag[1]=1;

  1172.     floor1_Y_final[0]=floor1_Y[0];

  1173.     floor1_Y_final[1]=floor1_Y[1];

  1174. 

  1175.     for(i=2;i<vf->x_list_dim;++i) {

  1176.         uint_fast16_t val, highroom, lowroom, room;

  1177.         uint_fast16_t high_neigh_offs;

  1178.         uint_fast16_t low_neigh_offs;

  1179. 

  1180.         low_neigh_offs=vf->low_neighbour[i];

  1181.         high_neigh_offs=vf->high_neighbour[i];

  1182.         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin

  1183.         adx=vf->x_list[high_neigh_offs]-vf->x_list[low_neigh_offs];

  1184.         ady= ABS(dy);

  1185.         err=ady*(vf->x_list[i]-vf->x_list[low_neigh_offs]);

  1186.         off=err/adx;

  1187.         if (dy<0) {

  1188.             predicted=floor1_Y_final[low_neigh_offs]-off;

  1189.         } else {

  1190.             predicted=floor1_Y_final[low_neigh_offs]+off;

  1191.         } // render_point end

  1192. 

  1193.         val=floor1_Y[i];

  1194.         highroom=range-predicted;

  1195.         lowroom=predicted;

  1196.         if (highroom < lowroom) {

  1197.             room=highroom*2;

  1198.         } else {

  1199.             room=lowroom*2;   // SPEC mispelling

  1200.         }

  1201.         if (val) {

  1202.             floor1_flag[low_neigh_offs]=1;

  1203.             floor1_flag[high_neigh_offs]=1;

  1204.             floor1_flag[i]=1;

  1205.             if (val>=room) {

  1206.                 if (highroom > lowroom) {

  1207.                     floor1_Y_final[i]=val-lowroom+predicted;

  1208.                 } else {

  1209.                     floor1_Y_final[i]=predicted-val+highroom-1;

  1210.                 }

  1211.             } else {

  1212.                 if (val & 1) {

  1213.                     floor1_Y_final[i]=predicted-(val+1)/2;

  1214.                 } else {

  1215.                     floor1_Y_final[i]=predicted+val/2;

  1216.                 }

  1217.             }

  1218.         } else {

  1219.             floor1_flag[i]=0;

  1220.             floor1_Y_final[i]=predicted;

  1221.         }

  1222. 

  1223.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->x_list[i], floor1_Y_final[i], val);

  1224.     }

  1225. 

  1226. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1227. 

  1228.     hx=0;

  1229.     lx=0;

  1230.     ly=floor1_Y_final[0]*vf->multiplier;  // conforms to SPEC

  1231. 

  1232.     vec[0]=floor1_inverse_db_table[ly];

  1233. 

  1234.     for(i=1;i<vf->x_list_dim;++i) {

  1235.         AV_DEBUG(" Looking at post %d \n", i);

  1236. 

  1237.         if (floor1_flag[floor_x_sort[i]]) {   // SPEC mispelled

  1238.             int_fast16_t x, y, dy, base, sy; // if uncommented: dy = -32 adx = 2  base = 2blablabla ?????

  1239. 

  1240.             hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;

  1241.             hx=vf->x_list[floor_x_sort[i]];

  1242. 

  1243.             dy=hy-ly;

  1244.             adx=hx-lx;

  1245.             ady= (dy<0) ? -dy:dy;//ABS(dy);

  1246.             base=dy/adx;

  1247. 

  1248.             AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);

  1249. 

  1250.             x=lx;

  1251.             y=ly;

  1252.             err=0;

  1253.             if (dy<0) {

  1254.                 sy=base-1;

  1255.             } else {

  1256.                 sy=base+1;

  1257.             }

  1258.             ady=ady-(base<0 ? -base : base)*adx;

  1259.             vec[x]=floor1_inverse_db_table[y];

  1260. 

  1261.             AV_DEBUG(" vec[ %d ] = %d \n", x, y);

  1262. 

  1263.             for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {

  1264.                 err+=ady;

  1265.                 if (err>=adx) {

  1266.                     err-=adx;

  1267.                     y+=sy;

  1268.                 } else {

  1269.                     y+=base;

  1270.                 }

  1271.                 vec[x]=floor1_inverse_db_table[y];

  1272. 

  1273.                 AV_DEBUG(" vec[ %d ] = %d \n", x, y);

  1274.             }

  1275. 

  1276. /*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point

  1277.                 dy=hy-ly;

  1278.                 adx=hx-lx;

  1279.                 ady= dy<0 ? -dy : dy;

  1280.                 err=ady*j;

  1281.                 off=err/adx;

  1282.                 if (dy<0) {

  1283.                     predicted=ly-off;

  1284.                 } else {

  1285.                     predicted=ly+off;

  1286.                 }

  1287.                 if (lx+j < vf->x_list[1]) {

  1288.                     vec[lx+j]=floor1_inverse_db_table[predicted];

  1289.                 }

  1290.             }*/

  1291. 

  1292.             lx=hx;

  1293.             ly=hy;

  1294.         }

  1295.     }

  1296. 

  1297.     if (hx<vf->x_list[1]) {

  1298.         for(i=hx;i<vf->x_list[1];++i) {

  1299.             vec[i]=floor1_inverse_db_table[hy];

  1300.         }

  1301.     }

  1302. 

  1303.     AV_DEBUG(" Floor decoded\n");

  1304. 

  1305.     return 0;

  1306. }

  1307. 

  1308. // Read and decode residue

  1309. 

  1310. 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) {

  1311.     GetBitContext *gb=&vc->gb;

  1312.     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;

  1313.     uint_fast16_t n_to_read=vr->end-vr->begin;

  1314.     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;

  1315.     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];

  1316.     uint_fast8_t pass;

  1317.     uint_fast8_t ch_used;

  1318.     uint_fast8_t i,j,l;

  1319.     uint_fast16_t k;

  1320. 

  1321.     if (vr->type==2) {

  1322.         for(j=1;j<ch;++j) {

  1323.                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input

  1324.         }

  1325.         if (do_not_decode[0]) return 0;

  1326.         ch_used=1;

  1327.     } else {

  1328.         ch_used=ch;

  1329.     }

  1330. 

  1331.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1332. 

  1333.     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?

  1334.         uint_fast16_t voffset;

  1335.         uint_fast16_t partition_count;

  1336.         uint_fast16_t j_times_ptns_to_read;

  1337. 

  1338.         voffset=vr->begin;

  1339.         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error

  1340.             if (!pass) {

  1341.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1342.                     if (!do_not_decode[j]) {

  1343.                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1344.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1345. 

  1346.                         AV_DEBUG("Classword: %d \n", temp);

  1347. 

  1348.                         assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]

  1349.                         for(i=0;i<c_p_c;++i) {

  1350.                             uint_fast32_t temp2;

  1351. 

  1352.                             temp2=(((uint_fast64_t)temp) * inverse[vr->classifications])>>32;

  1353.                             classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;

  1354.                             temp=temp2;

  1355.                         }

  1356.                     }

  1357.                     j_times_ptns_to_read+=ptns_to_read;

  1358.                 }

  1359.             }

  1360.             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {

  1361.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1362.                     uint_fast16_t voffs;

  1363. 

  1364.                     if (!do_not_decode[j]) {

  1365.                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];

  1366.                         int_fast16_t vqbook=vr->books[vqclass][pass];

  1367. 

  1368.                         if (vqbook>=0) {

  1369.                             uint_fast16_t coffs;

  1370.                             uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;

  1371.                             vorbis_codebook codebook= vc->codebooks[vqbook];

  1372. 

  1373.                             if (vr->type==0) {

  1374. 

  1375.                                 voffs=voffset+j*vlen;

  1376.                                 for(k=0;k<step;++k) {

  1377.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;

  1378.                                     for(l=0;l<codebook.dimensions;++l) {

  1379.                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH

  1380.                                     }

  1381.                                 }

  1382.                             }

  1383.                             else if (vr->type==1) {

  1384.                                 voffs=voffset+j*vlen;

  1385.                                 for(k=0;k<step;++k) {

  1386.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;

  1387.                                     for(l=0;l<codebook.dimensions;++l, ++voffs) {

  1388.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1389. 

  1390.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1391.                                     }

  1392.                                 }

  1393.                             }

  1394.                             else if (vr->type==2 && ch==2 && (voffset&1)==0 && (codebook.dimensions&1)==0) { // most frequent case optimized

  1395.                                 voffs=voffset>>1;

  1396. 

  1397.                                 for(k=0;k<step;++k) {

  1398.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;

  1399.                                     for(l=0;l<codebook.dimensions;l+=2, voffs++) {

  1400.                                         vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH

  1401.                                         vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH

  1402. 

  1403.                                         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);

  1404.                                     }

  1405.                                 }

  1406. 

  1407.                             }

  1408.                             else if (vr->type==2) {

  1409.                                 voffs=voffset;

  1410. 

  1411.                                 for(k=0;k<step;++k) {

  1412.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * codebook.dimensions;

  1413.                                     for(l=0;l<codebook.dimensions;++l, ++voffs) {

  1414.                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %

  1415. 

  1416.                                         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);

  1417.                                     }

  1418.                                 }

  1419.                             } else {

  1420.                                 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1421.                                 return 1;

  1422.                             }

  1423.                         }

  1424.                     }

  1425.                     j_times_ptns_to_read+=ptns_to_read;

  1426.                 }

  1427.                 ++partition_count;

  1428.                 voffset+=vr->partition_size;

  1429.             }

  1430.         }

  1431.     }

  1432.     return 0;

  1433. }

  1434. 

  1435. // Decode the audio packet using the functions above

  1436. #define BIAS 385

  1437. 

  1438. static int vorbis_parse_audio_packet(vorbis_context *vc) {

  1439.     GetBitContext *gb=&vc->gb;

  1440. 

  1441.     uint_fast8_t previous_window=0,next_window=0;

  1442.     uint_fast8_t mode_number;

  1443.     uint_fast16_t blocksize;

  1444.     int_fast32_t i,j;

  1445.     uint_fast8_t no_residue[vc->audio_channels];

  1446.     uint_fast8_t do_not_decode[vc->audio_channels];

  1447.     vorbis_mapping *mapping;

  1448.     float *ch_res_ptr=vc->channel_residues;

  1449.     float *ch_floor_ptr=vc->channel_floors;

  1450.     uint_fast8_t res_chan[vc->audio_channels];

  1451.     uint_fast8_t res_num=0;

  1452.     int_fast16_t retlen=0;

  1453.     uint_fast16_t saved_start=0;

  1454. 

  1455.     if (get_bits1(gb)) {

  1456.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1457.         return -1; // packet type not audio

  1458.     }

  1459. 

  1460.     if (vc->mode_count==1) {

  1461.         mode_number=0;

  1462.     } else {

  1463.         mode_number=get_bits(gb, ilog(vc->mode_count-1));

  1464.     }

  1465.     vc->mode_number=mode_number;

  1466.     mapping=&vc->mappings[vc->modes[mode_number].mapping];

  1467. 

  1468.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1469. 

  1470.     if (vc->modes[mode_number].blockflag) {

  1471.         previous_window=get_bits1(gb);

  1472.         next_window=get_bits1(gb);

  1473.     }

  1474. 

  1475.     blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;

  1476.     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1477.     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1478. 

  1479. // Decode floor

  1480. 

  1481.     for(i=0;i<vc->audio_channels;++i) {

  1482.         vorbis_floor *floor;

  1483.         if (mapping->submaps>1) {

  1484.             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1485.         } else {

  1486.             floor=&vc->floors[mapping->submap_floor[0]];

  1487.         }

  1488. 

  1489.         no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);

  1490.         ch_floor_ptr+=blocksize/2;

  1491.     }

  1492. 

  1493. // Nonzero vector propagate

  1494. 

  1495.     for(i=mapping->coupling_steps-1;i>=0;--i) {

  1496.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1497.             no_residue[mapping->magnitude[i]]=0;

  1498.             no_residue[mapping->angle[i]]=0;

  1499.         }

  1500.     }

  1501. 

  1502. // Decode residue

  1503. 

  1504.     for(i=0;i<mapping->submaps;++i) {

  1505.         vorbis_residue *residue;

  1506.         uint_fast8_t ch=0;

  1507. 

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

  1509.             if ((mapping->submaps==1) || (i=mapping->mux[j])) {

  1510.                 res_chan[j]=res_num;

  1511.                 if (no_residue[j]) {

  1512.                     do_not_decode[ch]=1;

  1513.                 } else {

  1514.                     do_not_decode[ch]=0;

  1515.                 }

  1516.                 ++ch;

  1517.                 ++res_num;

  1518.             }

  1519.         }

  1520.         residue=&vc->residues[mapping->submap_residue[i]];

  1521.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1522. 

  1523.         ch_res_ptr+=ch*blocksize/2;

  1524.     }

  1525. 

  1526. // Inverse coupling

  1527. 

  1528.     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed

  1529.         float *mag, *ang;

  1530. 

  1531.         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;

  1532.         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;

  1533.         for(j=0;j<blocksize/2;++j) {

  1534.             float temp;

  1535.             if (mag[j]>0.0) {

  1536.                 if (ang[j]>0.0) {

  1537.                     ang[j]=mag[j]-ang[j];

  1538.                 } else {

  1539.                     temp=ang[j];

  1540.                     ang[j]=mag[j];

  1541.                     mag[j]+=temp;

  1542.                 }

  1543.             } else {

  1544.                 if (ang[j]>0.0) {

  1545.                     ang[j]+=mag[j];

  1546.                 } else {

  1547.                     temp=ang[j];

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

  1549.                     mag[j]-=temp;

  1550.                 }

  1551.             }

  1552.         }

  1553.     }

  1554. 

  1555. // Dotproduct

  1556. 

  1557.     for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {

  1558.         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;

  1559. 

  1560.         for(i=0;i<blocksize/2;++i) {

  1561.             ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH

  1562.         }

  1563.     }

  1564. 

  1565. // MDCT, overlap/add, save data for next overlapping  FPMATH

  1566. 

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

  1568.         uint_fast8_t step=vc->audio_channels;

  1569.         uint_fast16_t k;

  1570.         float *saved=vc->saved+j*vc->blocksize_1/2;

  1571.         float *ret=vc->ret;

  1572.         const float *lwin=vc->lwin;

  1573.         const float *swin=vc->swin;

  1574.         float *buf=vc->buf;

  1575.         float *buf_tmp=vc->buf_tmp;

  1576. 

  1577.         ch_floor_ptr=vc->channel_floors+j*blocksize/2;

  1578. 

  1579.         saved_start=vc->saved_start;

  1580. 

  1581.         ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);

  1582. 

  1583.         if (vc->modes[mode_number].blockflag) {

  1584.             // -- overlap/add

  1585.             if (previous_window) {

  1586.                 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {

  1587.                     ret[k]=saved[i]+buf[i]*lwin[i]+BIAS;

  1588.                 }

  1589.                 retlen=vc->blocksize_1/2;

  1590.             } else {

  1591.                 buf += (vc->blocksize_1-vc->blocksize_0)/4;

  1592.                 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {

  1593.                     ret[k]=saved[i]+buf[i]*swin[i]+BIAS;

  1594.                 }

  1595.                 buf += vc->blocksize_0/2;

  1596.                 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {

  1597.                     ret[k]=buf[i]+BIAS;

  1598.                 }

  1599.                 buf=vc->buf;

  1600.                 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;

  1601.             }

  1602.             // -- save

  1603.             if (next_window) {

  1604.                 buf += vc->blocksize_1/2;

  1605.                 lwin += vc->blocksize_1/2-1;

  1606.                 for(i=0;i<vc->blocksize_1/2;++i) {

  1607.                     saved[i]=buf[i]*lwin[-i];

  1608.                 }

  1609.                 saved_start=0;

  1610.             } else {

  1611.                 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;

  1612.                 buf += vc->blocksize_1/2;

  1613.                 for(i=0;i<saved_start;++i) {

  1614.                     saved[i]=buf[i];

  1615.                 }

  1616.                 swin += vc->blocksize_0/2-1;

  1617.                 for(i=0;i<vc->blocksize_0/2;++i) {

  1618.                     saved[saved_start+i]=buf[saved_start+i]*swin[-i];

  1619.                 }

  1620.             }

  1621.         } else {

  1622.             // --overlap/add

  1623.             for(k=j, i=0;i<saved_start;++i, k+=step) {

  1624.                 ret[k]=saved[i]+BIAS;

  1625.             }

  1626.             for(i=0;i<vc->blocksize_0/2;++i, k+=step) {

  1627.                 ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS;

  1628.             }

  1629.             retlen=saved_start+vc->blocksize_0/2;

  1630.             // -- save

  1631.             buf += vc->blocksize_0/2;

  1632.             swin += vc->blocksize_0/2-1;

  1633.             for(i=0;i<vc->blocksize_0/2;++i) {

  1634.                 saved[i]=buf[i]*swin[-i];

  1635.             }

  1636.             saved_start=0;

  1637.         }

  1638.     }

  1639.     vc->saved_start=saved_start;

  1640. 

  1641.     return retlen*vc->audio_channels;

  1642. }

  1643. 

  1644. // Return the decoded audio packet through the standard api

  1645. 

  1646. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1647.                         void *data, int *data_size,

  1648.                         uint8_t *buf, int buf_size)

  1649. {

  1650.     vorbis_context *vc = avccontext->priv_data ;

  1651.     GetBitContext *gb = &(vc->gb);

  1652. 

  1653.     int_fast16_t i, len;

  1654. 

  1655.     if(!buf_size){

  1656.         return 0;

  1657.     }

  1658. 

  1659.     AV_DEBUG("packet length %d \n", buf_size);

  1660. 

  1661.     init_get_bits(gb, buf, buf_size*8);

  1662. 

  1663.     len=vorbis_parse_audio_packet(vc);

  1664. 

  1665.     if (len<=0) {

  1666.         *data_size=0;

  1667.         return buf_size;

  1668.     }

  1669. 

  1670.     if (!vc->first_frame) {

  1671.         vc->first_frame=1;

  1672.         *data_size=0;

  1673.         return buf_size ;

  1674.     }

  1675. 

  1676.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1677. 

  1678.     for(i=0;i<len;++i) {

  1679.         int_fast32_t tmp= ((int32_t*)vc->ret)[i];

  1680.         if(tmp & 0xf0000){

  1681. //            tmp= (0x43c0ffff - tmp)>>31; //ask gcc devs why this is slower

  1682.             if(tmp > 0x43c0ffff) tmp= 0xFFFF;

  1683.             else                 tmp= 0;

  1684.         }

  1685.         ((int16_t*)data)[i]=tmp - 0x8000;

  1686.     }

  1687. 

  1688.     *data_size=len*2;

  1689. 

  1690.     return buf_size ;

  1691. }

  1692. 

  1693. // Close decoder

  1694. 

  1695. static int vorbis_decode_close(AVCodecContext *avccontext) {

  1696.     vorbis_context *vc = avccontext->priv_data;

  1697. 

  1698.     vorbis_free(vc);

  1699. 

  1700.     return 0 ;

  1701. }

  1702. 

  1703. AVCodec vorbis_decoder = {

  1704.     "vorbis",

  1705.     CODEC_TYPE_AUDIO,

  1706.     CODEC_ID_VORBIS,

  1707.     sizeof(vorbis_context),

  1708.     vorbis_decode_init,

  1709.     NULL,

  1710.     vorbis_decode_close,

  1711.     vorbis_decode_frame,

  1712. };