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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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 11

  34. #define V_MAX_VLCS (1<<16)

  35. 

  36. #ifndef V_DEBUG

  37. #define AV_DEBUG(...)

  38. #endif

  39. 

  40. 

  41. 

  42. /* Helper functions */

  43. 

  44. /**

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

  46.  */

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

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

  49.     else{

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

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

  52.     }

  53. }

  54. 

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

  56. 

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

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

  59. 

  60.     do {

  61.         ++ret;

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

  63.     } while (j<=x);

  64. 

  65.     return (ret-1);

  66. }

  67. 

  68. static float vorbisfloat2float(uint_fast32_t val) {

  69.     double mant=val&0x1fffff;

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

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

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

  73. }

  74. 

  75. 

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

  77. 

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

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

  80.         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

  81. 

  82.     uint_fast8_t i,j;

  83.     uint_fast32_t code,p;

  84. 

  85. #ifdef V_DEBUG

  86.     GetBitContext gb;

  87. #endif

  88. 

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

  90.     if (p==num) {

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

  92.         return 0;

  93.     }

  94. 

  95.     codes[p]=0;

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

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

  98.     }

  99. 

  100. #ifdef V_DEBUG

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

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

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

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

  105.     }

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

  107. #endif

  108. 

  109.     ++p;

  110. 

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

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

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

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

  115.             if (exit_at_level[i]) break;

  116.         }

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

  118.         code=exit_at_level[i];

  119.         exit_at_level[i]=0;

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

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

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

  123.         }

  124.         codes[p]=code;

  125. 

  126. #ifdef V_DEBUG

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

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

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

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

  131.         }

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

  133. #endif

  134. 

  135.     }

  136. 

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

  138. 

  139.     return 0;

  140. }

  141. 

  142. // Free all allocated memory -----------------------------------------

  143. 

  144. static void vorbis_free(vorbis_context *vc) {

  145.     int_fast16_t i;

  146. 

  147.     av_freep(&vc->channel_residues);

  148.     av_freep(&vc->channel_floors);

  149.     av_freep(&vc->saved);

  150.     av_freep(&vc->ret);

  151.     av_freep(&vc->buf);

  152.     av_freep(&vc->buf_tmp);

  153. 

  154.     av_freep(&vc->residues);

  155.     av_freep(&vc->modes);

  156. 

  157.     ff_mdct_end(&vc->mdct0);

  158.     ff_mdct_end(&vc->mdct1);

  159. 

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

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

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

  163.     }

  164.     av_freep(&vc->codebooks);

  165. 

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

  167.         av_free(vc->floors[i].x_list);

  168.         av_free(vc->floors[i].x_list_order);

  169.         av_free(vc->floors[i].low_neighbour);

  170.         av_free(vc->floors[i].high_neighbour);

  171.     }

  172.     av_freep(&vc->floors);

  173. 

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

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

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

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

  178.     }

  179.     av_freep(&vc->mappings);

  180. }

  181. 

  182. // Parse setup header -------------------------------------------------

  183. 

  184. // Process codebooks part

  185. 

  186. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {

  187.     uint_fast16_t cb;

  188.     uint_fast8_t *tmp_vlc_bits;

  189.     uint_fast32_t *tmp_vlc_codes;

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

  191. 

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

  193. 

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

  195. 

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

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

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

  199. 

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

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

  202.         uint_fast8_t ordered;

  203.         uint_fast32_t t, used_entries=0;

  204.         uint_fast32_t entries;

  205. 

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

  207. 

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

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

  210.             goto error;

  211.         }

  212. 

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

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

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

  216.             goto error;

  217.         }

  218.         entries=get_bits(gb, 24);

  219.         if (entries>V_MAX_VLCS) {

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

  221.             goto error;

  222.         }

  223. 

  224.         ordered=get_bits1(gb);

  225. 

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

  227. 

  228.         if (!ordered) {

  229.             uint_fast16_t ce;

  230.             uint_fast8_t flag;

  231.             uint_fast8_t sparse=get_bits1(gb);

  232. 

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

  234. 

  235.             if (sparse) {

  236.                 AV_DEBUG(" sparse \n");

  237. 

  238.                 used_entries=0;

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

  240.                     flag=get_bits1(gb);

  241.                     if (flag) {

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

  243.                         ++used_entries;

  244.                     }

  245.                     else tmp_vlc_bits[ce]=0;

  246.                 }

  247.             } else {

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

  249. 

  250.                 used_entries=entries;

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

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

  253.                 }

  254.             }

  255.         } else {

  256.             uint_fast16_t current_entry=0;

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

  258. 

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

  260. 

  261.             used_entries=entries;

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

  263.                 uint_fast16_t i, number;

  264. 

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

  266. 

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

  268. 

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

  270. 

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

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

  273.                 }

  274. 

  275.                 current_entry+=number;

  276.             }

  277.             if (current_entry>used_entries) {

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

  279.                 goto error;

  280.             }

  281.         }

  282. 

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

  284. 

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

  286. 

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

  288. 

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

  290.             uint_fast16_t i, j, k;

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

  292.             uint_fast16_t codebook_multiplicands[codebook_lookup_values];

  293. 

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

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

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

  297.             uint_fast8_t codebook_sequence_p=get_bits1(gb);

  298. 

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

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

  301. 

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

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

  304. 

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

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

  307.             }

  308. 

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

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

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

  312.                 uint_fast8_t dim=codebook_setup->dimensions;

  313. 

  314.                 if (tmp_vlc_bits[i]) {

  315.                     float last=0.0;

  316.                     uint_fast32_t lookup_offset=i;

  317. 

  318. #ifdef V_DEBUG

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

  320. #endif

  321. 

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

  323.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  325.                         if (codebook_sequence_p) {

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

  327.                         }

  328.                         lookup_offset/=codebook_lookup_values;

  329.                     }

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

  331. 

  332. #ifdef V_DEBUG

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

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

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

  336.                     }

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

  338. #endif

  339. 

  340.                     ++j;

  341.                 }

  342.             }

  343.             if (j!=used_entries) {

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

  345.                 goto error;

  346.             }

  347.             entries=used_entries;

  348.         }

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

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

  351.             goto error;

  352.         }

  353. 

  354. // Initialize VLC table

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

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

  357.             goto error;

  358.         }

  359.         codebook_setup->maxdepth=0;

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

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

  362. 

  363.         codebook_setup->maxdepth=(codebook_setup->maxdepth+V_NB_BITS-1)/V_NB_BITS;

  364. 

  365.         if (init_vlc(&codebook_setup->vlc, V_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)) {

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

  367.             goto error;

  368.         }

  369.     }

  370. 

  371.     av_free(tmp_vlc_bits);

  372.     av_free(tmp_vlc_codes);

  373.     return 0;

  374. 

  375. // Error:

  376. error:

  377.     av_free(tmp_vlc_bits);

  378.     av_free(tmp_vlc_codes);

  379.     return 1;

  380. }

  381. 

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

  383. 

  384. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {

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

  386.     uint_fast8_t i;

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

  388. 

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

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

  391. 

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

  393. 

  394.         if (vorbis_tdtransform) {

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

  396.             return 1;

  397.         }

  398.     }

  399.     return 0;

  400. }

  401. 

  402. // Process floors part - only floor type 1 is supported

  403. 

  404. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {

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

  406.     uint_fast16_t i,j,k;

  407. 

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

  409. 

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

  411. 

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

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

  414. 

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

  416. 

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

  418. 

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

  420.             uint_fast8_t maximum_class=0;

  421.             uint_fast8_t rangebits;

  422.             uint_fast16_t floor1_values=2;

  423. 

  424.             floor_setup->partitions=get_bits(gb, 5);

  425. 

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

  427. 

  428.             for(j=0;j<floor_setup->partitions;++j) {

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

  430.                 if (floor_setup->partition_class[j]>maximum_class) maximum_class=floor_setup->partition_class[j];

  431. 

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

  433. 

  434.             }

  435. 

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

  437. 

  438.             floor_setup->maximum_class=maximum_class;

  439. 

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

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

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

  443. 

  444.                 AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->class_dimensions[j], floor_setup->class_subclasses[j]);

  445. 

  446.                 if (floor_setup->class_subclasses[j]) {

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

  448. 

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

  450.                 }

  451. 

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

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

  454. 

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

  456.                 }

  457.             }

  458. 

  459.             floor_setup->multiplier=get_bits(gb, 2)+1;

  460.             floor_setup->x_list_dim=2;

  461. 

  462.             for(j=0;j<floor_setup->partitions;++j) {

  463.                 floor_setup->x_list_dim+=floor_setup->class_dimensions[floor_setup->partition_class[j]];

  464.             }

  465. 

  466.             floor_setup->x_list=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));

  467.             floor_setup->x_list_order=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));

  468.             floor_setup->low_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));

  469.             floor_setup->high_neighbour=(uint_fast16_t *)av_mallocz(floor_setup->x_list_dim * sizeof(uint_fast16_t));

  470. 

  471. 

  472.             rangebits=get_bits(gb, 4);

  473.             floor_setup->x_list[0] = 0;

  474.             floor_setup->x_list[1] = (1<<rangebits);

  475. 

  476.             for(j=0;j<floor_setup->partitions;++j) {

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

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

  479. 

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

  481.                 }

  482.             }

  483. 

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

  485. 

  486.             for(k=0;k<floor_setup->x_list_dim;++k) {

  487.                 floor_setup->x_list_order[k]=k;

  488.             }

  489. 

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

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

  492.                     if(floor_setup->x_list[floor_setup->x_list_order[k]]>floor_setup->x_list[floor_setup->x_list_order[j]]) {

  493.                         uint_fast16_t tmp=floor_setup->x_list_order[k];

  494.                         floor_setup->x_list_order[k]=floor_setup->x_list_order[j];

  495.                         floor_setup->x_list_order[j]=tmp;

  496.                     }

  497.                 }

  498.             }

  499. 

  500. // Precalculate low and high neighbours

  501. 

  502.             for(k=2;k<floor_setup->x_list_dim;++k) {

  503.                 floor_setup->low_neighbour[k]=0;

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

  505. 

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

  507.                     if ((floor_setup->x_list[j]<floor_setup->x_list[k]) &&

  508.                       (floor_setup->x_list[j]>floor_setup->x_list[floor_setup->low_neighbour[k]])) {

  509.                         floor_setup->low_neighbour[k]=j;

  510.                     }

  511.                     if ((floor_setup->x_list[j]>floor_setup->x_list[k]) &&

  512.                       (floor_setup->x_list[j]<floor_setup->x_list[floor_setup->high_neighbour[k]])) {

  513.                         floor_setup->high_neighbour[k]=j;

  514.                     }

  515.                 }

  516.             }

  517.         }

  518.         else {

  519.             av_log(vc->avccontext, AV_LOG_ERROR, "Only floor type 1 supported. \n");

  520.             return 1;

  521.         }

  522.     }

  523.     return 0;

  524. }

  525. 

  526. // Process residues part

  527. 

  528. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){

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

  530.     uint_fast8_t i, j, k;

  531. 

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

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

  534. 

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

  536. 

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

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

  539.         uint_fast8_t cascade[64];

  540.         uint_fast8_t high_bits;

  541.         uint_fast8_t low_bits;

  542. 

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

  544. 

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

  546. 

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

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

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

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

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

  552. 

  553.         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,

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

  555. 

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

  557.             high_bits=0;

  558.             low_bits=get_bits(gb, 3);

  559.             if (get_bits1(gb)) {

  560.                 high_bits=get_bits(gb, 5);

  561.             }

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

  563. 

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

  565.         }

  566. 

  567.         res_setup->maxpass=0;

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

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

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

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

  572. 

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

  574. 

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

  576.                         res_setup->maxpass=k;

  577.                     }

  578.                 } else {

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

  580.                 }

  581.             }

  582.         }

  583.     }

  584.     return 0;

  585. }

  586. 

  587. // Process mappings part

  588. 

  589. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {

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

  591.     uint_fast8_t i, j;

  592. 

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

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

  595. 

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

  597. 

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

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

  600. 

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

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

  603.             return 1;

  604.         }

  605.         if (get_bits1(gb)) {

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

  607.         } else {

  608.             mapping_setup->submaps=1;

  609.         }

  610. 

  611.         if (get_bits1(gb)) {

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

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

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

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

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

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

  618.                 // FIXME: sanity checks

  619.             }

  620.         } else {

  621.             mapping_setup->coupling_steps=0;

  622.         }

  623. 

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

  625. 

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

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

  628.             return 1; // following spec.

  629.         }

  630. 

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

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

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

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

  635.             }

  636.         }

  637. 

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

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

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

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

  642. 

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

  644.         }

  645.     }

  646.     return 0;

  647. }

  648. 

  649. // Process modes part

  650. 

  651. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {

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

  653.     uint_fast8_t i;

  654. 

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

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

  657. 

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

  659. 

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

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

  662. 

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

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

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

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

  667. 

  668.         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);

  669.     }

  670.     return 0;

  671. }

  672. 

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

  674. 

  675. static int vorbis_parse_setup_hdr(vorbis_context *vc) {

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

  677. 

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

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

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

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

  682.         return 1;

  683.     }

  684. 

  685.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  687.         return 2;

  688.     }

  689.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  691.         return 3;

  692.     }

  693.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  695.         return 4;

  696.     }

  697.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  699.         return 5;

  700.     }

  701.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  703.         return 6;

  704.     }

  705.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  707.         return 7;

  708.     }

  709.     if (!get_bits1(gb)) {

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

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

  712.     }

  713. 

  714.     return 0;

  715. }

  716. 

  717. // Process the identification header

  718. 

  719. static int vorbis_parse_id_hdr(vorbis_context *vc){

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

  721.     uint_fast8_t bl0, bl1;

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

  723. 

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

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

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

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

  728.         return 1;

  729.     }

  730. 

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

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

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

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

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

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

  737.     bl0=get_bits(gb, 4);

  738.     bl1=get_bits(gb, 4);

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

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

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

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

  743.         return 3;

  744.     }

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

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

  747. 

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

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

  750.         return 2;

  751.     }

  752. 

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

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

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

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

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

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

  759.     vc->saved_start=0;

  760. 

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

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

  763. 

  764.     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 ",

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

  766. 

  767. /*

  768.     BLK=vc->blocksize_0;

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

  770.         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)));

  771.     }

  772. */

  773. 

  774.     return 0;

  775. }

  776. 

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

  778. 

  779. static int vorbis_decode_init(AVCodecContext *avccontext) {

  780.     vorbis_context *vc = avccontext->priv_data ;

  781.     uint8_t *headers = avccontext->extradata;

  782.     int headers_len=avccontext->extradata_size;

  783.     uint8_t *header_start[3];

  784.     int header_len[3];

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

  786.     int i, j, hdr_type;

  787. 

  788.     vc->avccontext = avccontext;

  789. 

  790.     if (!headers_len) {

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

  792.         return -1;

  793.     }

  794. 

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

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

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

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

  799.             header_start[i] = headers;

  800.             headers += header_len[i];

  801.         }

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

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

  804.             header_len[i]=0;

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

  806.                 header_len[i]+=0xff;

  807.                 ++j;

  808.             }

  809.             if (j>=headers_len) {

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

  811.                 return -1;

  812.             }

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

  814.         }

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

  816.         headers+=j;

  817.         header_start[0] = headers;

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

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

  820.     } else {

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

  822.         return -1;

  823.     }

  824. 

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

  826.     hdr_type=get_bits(gb, 8);

  827.     if (hdr_type!=1) {

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

  829.         return -1;

  830.     }

  831.     if (vorbis_parse_id_hdr(vc)) {

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

  833.         vorbis_free(vc);

  834.         return -1;

  835.     }

  836. 

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

  838.     hdr_type=get_bits(gb, 8);

  839.     if (hdr_type!=5) {

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

  841.         return -1;

  842.     }

  843.     if (vorbis_parse_setup_hdr(vc)) {

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

  845.         vorbis_free(vc);

  846.         return -1;

  847.     }

  848. 

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

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

  851. 

  852.     return 0 ;

  853. }

  854. 

  855. // Decode audiopackets -------------------------------------------------

  856. 

  857. // Read and decode floor (type 1 only)

  858. 

  859. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc, vorbis_floor *vf, float *vec) {

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

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

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

  863.     uint_fast16_t floor1_Y[vf->x_list_dim];

  864.     uint_fast16_t floor1_Y_final[vf->x_list_dim];

  865.     uint_fast8_t floor1_flag[vf->x_list_dim];

  866.     uint_fast8_t class_;

  867.     uint_fast8_t cdim;

  868.     uint_fast8_t cbits;

  869.     uint_fast8_t csub;

  870.     uint_fast8_t cval;

  871.     int_fast16_t book;

  872.     uint_fast16_t offset;

  873.     uint_fast16_t i,j;

  874.     uint_fast16_t *floor_x_sort=vf->x_list_order;

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

  876.     int_fast16_t dy, err;

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

  878. 

  879. 

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

  881. 

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

  883. 

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

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

  886. 

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

  888. 

  889.     offset=2;

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

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

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

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

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

  895.         cval=0;

  896. 

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

  898. 

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

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

  901.             V_NB_BITS, vc->codebooks[vf->class_masterbook[class_]].maxdepth);

  902.         }

  903. 

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

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

  906. 

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

  908. 

  909.             cval=cval>>cbits;

  910.             if (book>0) {

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

  912.                 V_NB_BITS, vc->codebooks[book].maxdepth);

  913.             } else {

  914.                 floor1_Y[offset+j]=0;

  915.             }

  916. 

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

  918.         }

  919.         offset+=cdim;

  920.     }

  921. 

  922. // Amplitude calculation from the differences

  923. 

  924.     floor1_flag[0]=1;

  925.     floor1_flag[1]=1;

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

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

  928. 

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

  930.         uint_fast16_t val, highroom, lowroom, room;

  931.         uint_fast16_t high_neigh_offs;

  932.         uint_fast16_t low_neigh_offs;

  933. 

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

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

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

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

  938.         ady= ABS(dy);

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

  940.         off=err/adx;

  941.         if (dy<0) {

  942.             predicted=floor1_Y_final[low_neigh_offs]-off;

  943.         } else {

  944.             predicted=floor1_Y_final[low_neigh_offs]+off;

  945.         } // render_point end

  946. 

  947.         val=floor1_Y[i];

  948.         highroom=range-predicted;

  949.         lowroom=predicted;

  950.         if (highroom < lowroom) {

  951.             room=highroom*2;

  952.         } else {

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

  954.         }

  955.         if (val) {

  956.             floor1_flag[low_neigh_offs]=1;

  957.             floor1_flag[high_neigh_offs]=1;

  958.             floor1_flag[i]=1;

  959.             if (val>=room) {

  960.                 if (highroom > lowroom) {

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

  962.                 } else {

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

  964.                 }

  965.             } else {

  966.                 if (val & 1) {

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

  968.                 } else {

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

  970.                 }

  971.             }

  972.         } else {

  973.             floor1_flag[i]=0;

  974.             floor1_Y_final[i]=predicted;

  975.         }

  976. 

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

  978.     }

  979. 

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

  981. 

  982.     hx=0;

  983.     lx=0;

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

  985. 

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

  987. 

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

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

  990. 

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

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

  993. 

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

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

  996. 

  997.             dy=hy-ly;

  998.             adx=hx-lx;

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

  1000.             base=dy/adx;

  1001. 

  1002.             AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);

  1003. 

  1004.             x=lx;

  1005.             y=ly;

  1006.             err=0;

  1007.             if (dy<0) {

  1008.                 sy=base-1;

  1009.             } else {

  1010.                 sy=base+1;

  1011.             }

  1012.             ady=ady-(base<0 ? -base : base)*adx;

  1013.             vec[x]=floor1_inverse_db_table[y];

  1014. 

  1015.             AV_DEBUG(" vec[ %d ] = %d \n", x, y);

  1016. 

  1017.             for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {

  1018.                 err+=ady;

  1019.                 if (err>=adx) {

  1020.                     err-=adx;

  1021.                     y+=sy;

  1022.                 } else {

  1023.                     y+=base;

  1024.                 }

  1025.                 vec[x]=floor1_inverse_db_table[y];

  1026. 

  1027.                 AV_DEBUG(" vec[ %d ] = %d \n", x, y);

  1028.             }

  1029. 

  1030. /*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point

  1031.                 dy=hy-ly;

  1032.                 adx=hx-lx;

  1033.                 ady= dy<0 ? -dy : dy;

  1034.                 err=ady*j;

  1035.                 off=err/adx;

  1036.                 if (dy<0) {

  1037.                     predicted=ly-off;

  1038.                 } else {

  1039.                     predicted=ly+off;

  1040.                 }

  1041.                 if (lx+j < vf->x_list[1]) {

  1042.                     vec[lx+j]=floor1_inverse_db_table[predicted];

  1043.                 }

  1044.             }*/

  1045. 

  1046.             lx=hx;

  1047.             ly=hy;

  1048.         }

  1049.     }

  1050. 

  1051.     if (hx<vf->x_list[1]) {

  1052.         for(i=hx;i<vf->x_list[1];++i) {

  1053.             vec[i]=floor1_inverse_db_table[hy];

  1054.         }

  1055.     }

  1056. 

  1057.     AV_DEBUG(" Floor decoded\n");

  1058. 

  1059.     return 0;

  1060. }

  1061. 

  1062. // Read and decode residue

  1063. 

  1064. 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) {

  1065.     GetBitContext *gb=&vc->gb;

  1066.     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;

  1067.     uint_fast16_t n_to_read=vr->end-vr->begin;

  1068.     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;

  1069.     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];

  1070.     uint_fast8_t pass;

  1071.     uint_fast8_t ch_used;

  1072.     uint_fast8_t i,j,l;

  1073.     uint_fast16_t k;

  1074. 

  1075.     if (vr->type==2) {

  1076.         for(j=1;j<ch;++j) {

  1077.                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input

  1078.         }

  1079.         if (do_not_decode[0]) return 0;

  1080.         ch_used=1;

  1081.     } else {

  1082.         ch_used=ch;

  1083.     }

  1084. 

  1085.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1086. 

  1087.     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?

  1088.         uint_fast16_t voffset;

  1089.         uint_fast16_t partition_count;

  1090.         uint_fast16_t j_times_ptns_to_read;

  1091. 

  1092.         voffset=vr->begin;

  1093.         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error

  1094.             if (!pass) {

  1095.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1096.                     if (!do_not_decode[j]) {

  1097.                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1098.                         V_NB_BITS, vc->codebooks[vr->classbook].maxdepth);

  1099. 

  1100.                         AV_DEBUG("Classword: %d \n", temp);

  1101. 

  1102.                         for(i=0;i<c_p_c;++i) {

  1103.                             uint_fast32_t temp2;

  1104. 

  1105.                             temp2=temp/vr->classifications;

  1106.                             classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;

  1107.                             temp=temp2;

  1108.                         }

  1109.                     }

  1110.                     j_times_ptns_to_read+=ptns_to_read;

  1111.                 }

  1112.             }

  1113.             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {

  1114.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1115.                     uint_fast16_t voffs;

  1116. 

  1117.                     if (!do_not_decode[j]) {

  1118.                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];

  1119.                         int_fast16_t vqbook=vr->books[vqclass][pass];

  1120. 

  1121.                         if (vqbook>=0) {

  1122.                             uint_fast16_t coffs;

  1123. 

  1124.                             if (vr->type==0) {

  1125.                                 uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;

  1126. 

  1127.                                 voffs=voffset+j*vlen;

  1128.                                 for(k=0;k<step;++k) {

  1129.                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,

  1130.                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;

  1131.                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l) {

  1132.                                         vec[voffs+k+l*step]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH

  1133.                                     }

  1134.                                 }

  1135.                             }

  1136.                             else if (vr->type==1) {

  1137.                                 voffs=voffset+j*vlen;

  1138.                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {

  1139.                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,

  1140.                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;

  1141.                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {

  1142.                                         vec[voffs]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH

  1143. 

  1144.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], vc->codebooks[vqbook].codevectors[coffs+l], coffs);

  1145.                                     }

  1146.                                 }

  1147.                             }

  1148.                             else if (vr->type==2 && ch==2) { // most frequent case optimized

  1149.                                 voffs=voffset;

  1150. 

  1151.                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {

  1152.                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,

  1153.                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;

  1154.                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {

  1155.                                         vec[(voffs>>1)+((voffs&1) ? vlen : 0)]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH

  1156. 

  1157.                                         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], vc->codebooks[vqbook].codevectors[coffs+l], coffs, l);

  1158.                                     }

  1159.                                 }

  1160. 

  1161.                             }

  1162.                             else if (vr->type==2) {

  1163.                                 voffs=voffset;

  1164. 

  1165.                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {

  1166.                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,

  1167.                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;

  1168.                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {

  1169.                                         vec[voffs/ch+(voffs%ch)*vlen]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %

  1170. 

  1171.                                         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], vc->codebooks[vqbook].codevectors[coffs+l], coffs, l);

  1172.                                     }

  1173.                                 }

  1174.                             } else {

  1175.                                 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1176.                                 return 1;

  1177.                             }

  1178.                         }

  1179.                     }

  1180.                     j_times_ptns_to_read+=ptns_to_read;

  1181.                 }

  1182.                 ++partition_count;

  1183.                 voffset+=vr->partition_size;

  1184.             }

  1185.         }

  1186.     }

  1187.     return 0;

  1188. }

  1189. 

  1190. // Decode the audio packet using the functions above

  1191. #define BIAS 385

  1192. 

  1193. static int vorbis_parse_audio_packet(vorbis_context *vc) {

  1194.     GetBitContext *gb=&vc->gb;

  1195. 

  1196.     uint_fast8_t previous_window=0,next_window=0;

  1197.     uint_fast8_t mode_number;

  1198.     uint_fast16_t blocksize;

  1199.     int_fast32_t i,j;

  1200.     uint_fast8_t no_residue[vc->audio_channels];

  1201.     uint_fast8_t do_not_decode[vc->audio_channels];

  1202.     vorbis_mapping *mapping;

  1203.     float *ch_res_ptr=vc->channel_residues;

  1204.     float *ch_floor_ptr=vc->channel_floors;

  1205.     uint_fast8_t res_chan[vc->audio_channels];

  1206.     uint_fast8_t res_num=0;

  1207.     int_fast16_t retlen=0;

  1208.     uint_fast16_t saved_start=0;

  1209. 

  1210.     if (get_bits1(gb)) {

  1211.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1212.         return -1; // packet type not audio

  1213.     }

  1214. 

  1215.     if (vc->mode_count==1) {

  1216.         mode_number=0;

  1217.     } else {

  1218.         mode_number=get_bits(gb, ilog(vc->mode_count-1));

  1219.     }

  1220.     mapping=&vc->mappings[vc->modes[mode_number].mapping];

  1221. 

  1222.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1223. 

  1224.     if (vc->modes[mode_number].blockflag) {

  1225.         previous_window=get_bits1(gb);

  1226.         next_window=get_bits1(gb);

  1227.     }

  1228. 

  1229.     blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;

  1230.     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1231.     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1232. 

  1233. // Decode floor(1)

  1234. 

  1235.     for(i=0;i<vc->audio_channels;++i) {

  1236.         vorbis_floor *floor;

  1237.         if (mapping->submaps>1) {

  1238.             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1239.         } else {

  1240.             floor=&vc->floors[mapping->submap_floor[0]];

  1241.         }

  1242. 

  1243.         no_residue[i]=vorbis_floor1_decode(vc, floor, ch_floor_ptr);

  1244.         ch_floor_ptr+=blocksize/2;

  1245.     }

  1246. 

  1247. // Nonzero vector propagate

  1248. 

  1249.     for(i=mapping->coupling_steps-1;i>=0;--i) {

  1250.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1251.             no_residue[mapping->magnitude[i]]=0;

  1252.             no_residue[mapping->angle[i]]=0;

  1253.         }

  1254.     }

  1255. 

  1256. // Decode residue

  1257. 

  1258.     for(i=0;i<mapping->submaps;++i) {

  1259.         vorbis_residue *residue;

  1260.         uint_fast8_t ch=0;

  1261. 

  1262.         for(j=0;j<vc->audio_channels;++j) {

  1263.             if ((mapping->submaps==1) || (i=mapping->mux[j])) {

  1264.                 res_chan[j]=res_num;

  1265.                 if (no_residue[j]) {

  1266.                     do_not_decode[ch]=1;

  1267.                 } else {

  1268.                     do_not_decode[ch]=0;

  1269.                 }

  1270.                 ++ch;

  1271.                 ++res_num;

  1272.             }

  1273.         }

  1274.         residue=&vc->residues[mapping->submap_residue[i]];

  1275.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1276. 

  1277.         ch_res_ptr+=ch*blocksize/2;

  1278.     }

  1279. 

  1280. // Inverse coupling

  1281. 

  1282.     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed

  1283.         float *mag, *ang;

  1284. 

  1285.         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;

  1286.         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;

  1287.         for(j=0;j<blocksize/2;++j) {

  1288.             float temp;

  1289.             if (mag[j]>0.0) {

  1290.                 if (ang[j]>0.0) {

  1291.                     ang[j]=mag[j]-ang[j];

  1292.                 } else {

  1293.                     temp=ang[j];

  1294.                     ang[j]=mag[j];

  1295.                     mag[j]+=temp;

  1296.                 }

  1297.             } else {

  1298.                 if (ang[j]>0.0) {

  1299.                     ang[j]+=mag[j];

  1300.                 } else {

  1301.                     temp=ang[j];

  1302.                     ang[j]=mag[j];

  1303.                     mag[j]-=temp;

  1304.                 }

  1305.             }

  1306.         }

  1307.     }

  1308. 

  1309. // Dotproduct

  1310. 

  1311.     for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {

  1312.         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;

  1313. 

  1314.         for(i=0;i<blocksize/2;++i) {

  1315.             ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH

  1316.         }

  1317.     }

  1318. 

  1319. // MDCT, overlap/add, save data for next overlapping  FPMATH

  1320. 

  1321.     for(j=0;j<vc->audio_channels;++j) {

  1322.         uint_fast8_t step=vc->audio_channels;

  1323.         uint_fast16_t k;

  1324.         float *saved=vc->saved+j*vc->blocksize_1/2;

  1325.         float *ret=vc->ret;

  1326.         const float *lwin=vc->lwin;

  1327.         const float *swin=vc->swin;

  1328.         float *buf=vc->buf;

  1329.         float *buf_tmp=vc->buf_tmp;

  1330. 

  1331.         ch_floor_ptr=vc->channel_floors+j*blocksize/2;

  1332. 

  1333.         saved_start=vc->saved_start;

  1334. 

  1335.         ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);

  1336. 

  1337.         if (vc->modes[mode_number].blockflag) {

  1338.             // -- overlap/add

  1339.             if (previous_window) {

  1340.                 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {

  1341.                     ret[k]=saved[i]+buf[i]*lwin[i]+BIAS;

  1342.                 }

  1343.                 retlen=vc->blocksize_1/2;

  1344.             } else {

  1345.                 buf += (vc->blocksize_1-vc->blocksize_0)/4;

  1346.                 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {

  1347.                     ret[k]=saved[i]+buf[i]*swin[i]+BIAS;

  1348.                 }

  1349.                 buf += vc->blocksize_0/2;

  1350.                 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {

  1351.                     ret[k]=buf[i]+BIAS;

  1352.                 }

  1353.                 buf=vc->buf;

  1354.                 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;

  1355.             }

  1356.             // -- save

  1357.             if (next_window) {

  1358.                 buf += vc->blocksize_1/2;

  1359.                 lwin += vc->blocksize_1/2-1;

  1360.                 for(i=0;i<vc->blocksize_1/2;++i) {

  1361.                     saved[i]=buf[i]*lwin[-i];

  1362.                 }

  1363.                 saved_start=0;

  1364.             } else {

  1365.                 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;

  1366.                 buf += vc->blocksize_1/2;

  1367.                 for(i=0;i<saved_start;++i) {

  1368.                     saved[i]=buf[i];

  1369.                 }

  1370.                 swin += vc->blocksize_0/2-1;

  1371.                 for(i=0;i<vc->blocksize_0/2;++i) {

  1372.                     saved[saved_start+i]=buf[saved_start+i]*swin[-i];

  1373.                 }

  1374.             }

  1375.         } else {

  1376.             // --overlap/add

  1377.             for(k=j, i=0;i<saved_start;++i, k+=step) {

  1378.                 ret[k]=saved[i]+BIAS;

  1379.             }

  1380.             for(i=0;i<vc->blocksize_0/2;++i, k+=step) {

  1381.                 ret[k]=saved[saved_start+i]+buf[i]*swin[i]+BIAS;

  1382.             }

  1383.             retlen=saved_start+vc->blocksize_0/2;

  1384.             // -- save

  1385.             buf += vc->blocksize_0/2;

  1386.             swin += vc->blocksize_0/2-1;

  1387.             for(i=0;i<vc->blocksize_0/2;++i) {

  1388.                 saved[i]=buf[i]*swin[-i];

  1389.             }

  1390.             saved_start=0;

  1391.         }

  1392.     }

  1393.     vc->saved_start=saved_start;

  1394. 

  1395.     return retlen*vc->audio_channels;

  1396. }

  1397. 

  1398. // Return the decoded audio packet through the standard api

  1399. 

  1400. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1401.                         void *data, int *data_size,

  1402.                         uint8_t *buf, int buf_size)

  1403. {

  1404.     vorbis_context *vc = avccontext->priv_data ;

  1405.     GetBitContext *gb = &(vc->gb);

  1406. 

  1407.     int_fast16_t i, len;

  1408. 

  1409.     if(!buf_size){

  1410.         return 0;

  1411.     }

  1412. 

  1413.     AV_DEBUG("packet length %d \n", buf_size);

  1414. 

  1415.     init_get_bits(gb, buf, buf_size*8);

  1416. 

  1417.     len=vorbis_parse_audio_packet(vc);

  1418. 

  1419.     if (len<=0) {

  1420.         *data_size=0;

  1421.         return buf_size;

  1422.     }

  1423. 

  1424.     if (!vc->first_frame) {

  1425.         vc->first_frame=1;

  1426.         *data_size=0;

  1427.         return buf_size ;

  1428.     }

  1429. 

  1430.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1431. 

  1432.     for(i=0;i<len;++i) {

  1433.         int_fast32_t tmp= ((int32_t*)vc->ret)[i];

  1434.         if(tmp & 0xf0000){

  1435. //            tmp= (0x43c0ffff - tmp)>>31; //ask gcc devs why this is slower

  1436.             if(tmp > 0x43c0ffff) tmp= 0xFFFF;

  1437.             else                 tmp= 0;

  1438.         }

  1439.         ((int16_t*)data)[i]=tmp - 0x8000;

  1440.     }

  1441. 

  1442.     *data_size=len*2;

  1443. 

  1444.     return buf_size ;

  1445. }

  1446. 

  1447. // Close decoder

  1448. 

  1449. static int vorbis_decode_close(AVCodecContext *avccontext) {

  1450.     vorbis_context *vc = avccontext->priv_data;

  1451. 

  1452.     vorbis_free(vc);

  1453. 

  1454.     return 0 ;

  1455. }

  1456. 

  1457. AVCodec vorbis_decoder = {

  1458.     "vorbis",

  1459.     CODEC_TYPE_AUDIO,

  1460.     CODEC_ID_VORBIS,

  1461.     sizeof(vorbis_context),

  1462.     vorbis_decode_init,

  1463.     NULL,

  1464.     vorbis_decode_close,

  1465.     vorbis_decode_frame,

  1466. };