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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. static unsigned int ilog(unsigned int i) { // unfortunatelly av_log2 uses different rounding

  56.     unsigned int ret=0;

  57.     while (i!=0) {

  58.         ++ret;

  59.         i>>=1;

  60.     }

  61.     return ret;

  62. }

  63. 

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

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

  66. 

  67.     do {

  68.         ++ret;

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

  70.     } while (j<=x);

  71. 

  72.     return (ret-1);

  73. }

  74. 

  75. static float vorbisfloat2float(uint_fast32_t val) {

  76.     double mant=val&0x1fffff;

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

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

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

  80. }

  81. 

  82. 

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

  84. 

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

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

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

  88. 

  89.     uint_fast8_t i,j;

  90.     uint_fast32_t code,p;

  91. 

  92. #ifdef V_DEBUG

  93.     GetBitContext gb;

  94. #endif

  95. 

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

  97.     if (p==num) {

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

  99.         return 0;

  100.     }

  101. 

  102.     codes[p]=0;

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

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

  105.     }

  106. 

  107. #ifdef V_DEBUG

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

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

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

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

  112.     }

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

  114. #endif

  115. 

  116.     ++p;

  117. 

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

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

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

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

  122.             if (exit_at_level[i]) break;

  123.         }

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

  125.         code=exit_at_level[i];

  126.         exit_at_level[i]=0;

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

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

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

  130.         }

  131.         codes[p]=code;

  132. 

  133. #ifdef V_DEBUG

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

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

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

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

  138.         }

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

  140. #endif

  141. 

  142.     }

  143. 

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

  145. 

  146.     return 0;

  147. }

  148. 

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

  150. 

  151. static void vorbis_free(vorbis_context *vc) {

  152.     int_fast16_t i;

  153. 

  154.     av_freep(&vc->channel_residues);

  155.     av_freep(&vc->channel_floors);

  156.     av_freep(&vc->saved);

  157.     av_freep(&vc->ret);

  158.     av_freep(&vc->buf);

  159.     av_freep(&vc->buf_tmp);

  160. 

  161.     av_freep(&vc->residues);

  162.     av_freep(&vc->modes);

  163. 

  164.     ff_mdct_end(&vc->mdct0);

  165.     ff_mdct_end(&vc->mdct1);

  166. 

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

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

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

  170.     }

  171.     av_freep(&vc->codebooks);

  172. 

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

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

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

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

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

  178.     }

  179.     av_freep(&vc->floors);

  180. 

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

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

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

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

  185.     }

  186.     av_freep(&vc->mappings);

  187. }

  188. 

  189. // Parse setup header -------------------------------------------------

  190. 

  191. // Process codebooks part

  192. 

  193. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {

  194.     uint_fast16_t cb;

  195.     uint_fast8_t *tmp_vlc_bits;

  196.     uint_fast32_t *tmp_vlc_codes;

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

  198. 

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

  200. 

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

  202. 

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

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

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

  206. 

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

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

  209.         uint_fast8_t ordered;

  210.         uint_fast32_t t, used_entries=0;

  211.         uint_fast32_t entries;

  212. 

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

  214. 

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

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

  217.             goto error;

  218.         }

  219. 

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

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

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

  223.             goto error;

  224.         }

  225.         entries=get_bits(gb, 24);

  226.         if (entries>V_MAX_VLCS) {

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

  228.             goto error;

  229.         }

  230. 

  231.         ordered=get_bits1(gb);

  232. 

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

  234. 

  235.         if (!ordered) {

  236.             uint_fast16_t ce;

  237.             uint_fast8_t flag;

  238.             uint_fast8_t sparse=get_bits1(gb);

  239. 

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

  241. 

  242.             if (sparse) {

  243.                 AV_DEBUG(" sparse \n");

  244. 

  245.                 used_entries=0;

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

  247.                     flag=get_bits1(gb);

  248.                     if (flag) {

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

  250.                         ++used_entries;

  251.                     }

  252.                     else tmp_vlc_bits[ce]=0;

  253.                 }

  254.             } else {

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

  256. 

  257.                 used_entries=entries;

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

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

  260.                 }

  261.             }

  262.         } else {

  263.             uint_fast16_t current_entry=0;

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

  265. 

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

  267. 

  268.             used_entries=entries;

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

  270.                 uint_fast16_t i, number;

  271. 

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

  273. 

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

  275. 

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

  277. 

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

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

  280.                 }

  281. 

  282.                 current_entry+=number;

  283.             }

  284.             if (current_entry>used_entries) {

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

  286.                 goto error;

  287.             }

  288.         }

  289. 

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

  291. 

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

  293. 

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

  295. 

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

  297.             uint_fast16_t i, j, k;

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

  299.             uint_fast16_t codebook_multiplicands[codebook_lookup_values];

  300. 

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

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

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

  304.             uint_fast8_t codebook_sequence_p=get_bits1(gb);

  305. 

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

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

  308. 

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

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

  311. 

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

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

  314.             }

  315. 

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

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

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

  319.                 uint_fast8_t dim=codebook_setup->dimensions;

  320. 

  321.                 if (tmp_vlc_bits[i]) {

  322.                     float last=0.0;

  323.                     uint_fast32_t lookup_offset=i;

  324. 

  325. #ifdef V_DEBUG

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

  327. #endif

  328. 

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

  330.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  332.                         if (codebook_sequence_p) {

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

  334.                         }

  335.                         lookup_offset/=codebook_lookup_values;

  336.                     }

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

  338. 

  339. #ifdef V_DEBUG

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

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

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

  343.                     }

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

  345. #endif

  346. 

  347.                     ++j;

  348.                 }

  349.             }

  350.             if (j!=used_entries) {

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

  352.                 goto error;

  353.             }

  354.             entries=used_entries;

  355.         }

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

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

  358.             goto error;

  359.         }

  360. 

  361. // Initialize VLC table

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

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

  364.             goto error;

  365.         }

  366.         codebook_setup->maxdepth=0;

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

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

  369. 

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

  371. 

  372.         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)) {

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

  374.             goto error;

  375.         }

  376.     }

  377. 

  378.     av_free(tmp_vlc_bits);

  379.     av_free(tmp_vlc_codes);

  380.     return 0;

  381. 

  382. // Error:

  383. error:

  384.     av_free(tmp_vlc_bits);

  385.     av_free(tmp_vlc_codes);

  386.     return 1;

  387. }

  388. 

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

  390. 

  391. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {

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

  393.     uint_fast8_t i;

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

  395. 

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

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

  398. 

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

  400. 

  401.         if (vorbis_tdtransform) {

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

  403.             return 1;

  404.         }

  405.     }

  406.     return 0;

  407. }

  408. 

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

  410. 

  411. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {

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

  413.     uint_fast16_t i,j,k;

  414. 

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

  416. 

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

  418. 

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

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

  421. 

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

  423. 

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

  425. 

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

  427.             uint_fast8_t maximum_class=0;

  428.             uint_fast8_t rangebits;

  429.             uint_fast16_t floor1_values=2;

  430. 

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

  432. 

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

  434. 

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

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

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

  438. 

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

  440. 

  441.             }

  442. 

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

  444. 

  445.             floor_setup->maximum_class=maximum_class;

  446. 

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

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

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

  450. 

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

  452. 

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

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

  455. 

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

  457.                 }

  458. 

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

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

  461. 

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

  463.                 }

  464.             }

  465. 

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

  467.             floor_setup->x_list_dim=2;

  468. 

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

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

  471.             }

  472. 

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

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

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

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

  477. 

  478. 

  479.             rangebits=get_bits(gb, 4);

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

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

  482. 

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

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

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

  486. 

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

  488.                 }

  489.             }

  490. 

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

  492. 

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

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

  495.             }

  496. 

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

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

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

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

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

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

  503.                     }

  504.                 }

  505.             }

  506. 

  507. // Precalculate low and high neighbours

  508. 

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

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

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

  512. 

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

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

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

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

  517.                     }

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

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

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

  521.                     }

  522.                 }

  523.             }

  524.         }

  525.         else {

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

  527.             return 1;

  528.         }

  529.     }

  530.     return 0;

  531. }

  532. 

  533. // Process residues part

  534. 

  535. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){

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

  537.     uint_fast8_t i, j, k;

  538. 

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

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

  541. 

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

  543. 

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

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

  546.         uint_fast8_t cascade[64];

  547.         uint_fast8_t high_bits;

  548.         uint_fast8_t low_bits;

  549. 

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

  551. 

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

  553. 

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

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

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

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

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

  559. 

  560.         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,

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

  562. 

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

  564.             high_bits=0;

  565.             low_bits=get_bits(gb, 3);

  566.             if (get_bits1(gb)) {

  567.                 high_bits=get_bits(gb, 5);

  568.             }

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

  570. 

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

  572.         }

  573. 

  574.         res_setup->maxpass=0;

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

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

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

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

  579. 

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

  581. 

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

  583.                         res_setup->maxpass=k;

  584.                     }

  585.                 } else {

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

  587.                 }

  588.             }

  589.         }

  590.     }

  591.     return 0;

  592. }

  593. 

  594. // Process mappings part

  595. 

  596. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {

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

  598.     uint_fast8_t i, j;

  599. 

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

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

  602. 

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

  604. 

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

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

  607. 

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

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

  610.             return 1;

  611.         }

  612.         if (get_bits1(gb)) {

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

  614.         } else {

  615.             mapping_setup->submaps=1;

  616.         }

  617. 

  618.         if (get_bits1(gb)) {

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

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

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

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

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

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

  625.                 // FIXME: sanity checks

  626.             }

  627.         } else {

  628.             mapping_setup->coupling_steps=0;

  629.         }

  630. 

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

  632. 

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

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

  635.             return 1; // following spec.

  636.         }

  637. 

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

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

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

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

  642.             }

  643.         }

  644. 

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

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

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

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

  649. 

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

  651.         }

  652.     }

  653.     return 0;

  654. }

  655. 

  656. // Process modes part

  657. 

  658. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {

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

  660.     uint_fast8_t i;

  661. 

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

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

  664. 

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

  666. 

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

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

  669. 

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

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

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

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

  674. 

  675.         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);

  676.     }

  677.     return 0;

  678. }

  679. 

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

  681. 

  682. static int vorbis_parse_setup_hdr(vorbis_context *vc) {

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

  684. 

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

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

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

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

  689.         return 1;

  690.     }

  691. 

  692.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  694.         return 2;

  695.     }

  696.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  698.         return 3;

  699.     }

  700.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  702.         return 4;

  703.     }

  704.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  706.         return 5;

  707.     }

  708.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  710.         return 6;

  711.     }

  712.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  714.         return 7;

  715.     }

  716.     if (!get_bits1(gb)) {

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

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

  719.     }

  720. 

  721.     return 0;

  722. }

  723. 

  724. // Process the identification header

  725. 

  726. static int vorbis_parse_id_hdr(vorbis_context *vc){

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

  728.     uint_fast8_t bl0, bl1;

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

  730. 

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

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

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

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

  735.         return 1;

  736.     }

  737. 

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

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

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

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

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

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

  744.     bl0=get_bits(gb, 4);

  745.     bl1=get_bits(gb, 4);

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

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

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

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

  750.         return 3;

  751.     }

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

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

  754. 

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

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

  757.         return 2;

  758.     }

  759. 

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

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

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

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

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

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

  766.     vc->saved_start=0;

  767. 

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

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

  770. 

  771.     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 ",

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

  773. 

  774. /*

  775.     BLK=vc->blocksize_0;

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

  777.         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)));

  778.     }

  779. */

  780. 

  781.     return 0;

  782. }

  783. 

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

  785. 

  786. static int vorbis_decode_init(AVCodecContext *avccontext) {

  787.     vorbis_context *vc = avccontext->priv_data ;

  788.     uint8_t *headers = avccontext->extradata;

  789.     int headers_len=avccontext->extradata_size;

  790.     uint8_t *header_start[3];

  791.     int header_len[3];

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

  793.     int i, j, hdr_type;

  794. 

  795.     vc->avccontext = avccontext;

  796. 

  797.     if (!headers_len) {

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

  799.         return -1;

  800.     }

  801. 

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

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

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

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

  806.             header_start[i] = headers;

  807.             headers += header_len[i];

  808.         }

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

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

  811.             header_len[i]=0;

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

  813.                 header_len[i]+=0xff;

  814.                 ++j;

  815.             }

  816.             if (j>=headers_len) {

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

  818.                 return -1;

  819.             }

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

  821.         }

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

  823.         headers+=j;

  824.         header_start[0] = headers;

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

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

  827.     } else {

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

  829.         return -1;

  830.     }

  831. 

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

  833.     hdr_type=get_bits(gb, 8);

  834.     if (hdr_type!=1) {

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

  836.         return -1;

  837.     }

  838.     if (vorbis_parse_id_hdr(vc)) {

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

  840.         vorbis_free(vc);

  841.         return -1;

  842.     }

  843. 

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

  845.     hdr_type=get_bits(gb, 8);

  846.     if (hdr_type!=5) {

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

  848.         return -1;

  849.     }

  850.     if (vorbis_parse_setup_hdr(vc)) {

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

  852.         vorbis_free(vc);

  853.         return -1;

  854.     }

  855. 

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

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

  858. 

  859.     return 0 ;

  860. }

  861. 

  862. // Decode audiopackets -------------------------------------------------

  863. 

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

  865. 

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

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

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

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

  870.     uint_fast16_t floor1_Y[vf->x_list_dim];

  871.     uint_fast16_t floor1_Y_final[vf->x_list_dim];

  872.     uint_fast8_t floor1_flag[vf->x_list_dim];

  873.     uint_fast8_t class_;

  874.     uint_fast8_t cdim;

  875.     uint_fast8_t cbits;

  876.     uint_fast8_t csub;

  877.     uint_fast8_t cval;

  878.     int_fast16_t book;

  879.     uint_fast16_t offset;

  880.     uint_fast16_t i,j;

  881.     uint_fast16_t *floor_x_sort=vf->x_list_order;

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

  883.     int_fast16_t dy, err;

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

  885. 

  886. 

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

  888. 

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

  890. 

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

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

  893. 

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

  895. 

  896.     offset=2;

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

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

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

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

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

  902.         cval=0;

  903. 

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

  905. 

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

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

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

  909.         }

  910. 

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

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

  913. 

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

  915. 

  916.             cval=cval>>cbits;

  917.             if (book>0) {

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

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

  920.             } else {

  921.                 floor1_Y[offset+j]=0;

  922.             }

  923. 

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

  925.         }

  926.         offset+=cdim;

  927.     }

  928. 

  929. // Amplitude calculation from the differences

  930. 

  931.     floor1_flag[0]=1;

  932.     floor1_flag[1]=1;

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

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

  935. 

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

  937.         uint_fast16_t val, highroom, lowroom, room;

  938.         uint_fast16_t high_neigh_offs;

  939.         uint_fast16_t low_neigh_offs;

  940. 

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

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

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

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

  945.         ady= ABS(dy);

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

  947.         off=err/adx;

  948.         if (dy<0) {

  949.             predicted=floor1_Y_final[low_neigh_offs]-off;

  950.         } else {

  951.             predicted=floor1_Y_final[low_neigh_offs]+off;

  952.         } // render_point end

  953. 

  954.         val=floor1_Y[i];

  955.         highroom=range-predicted;

  956.         lowroom=predicted;

  957.         if (highroom < lowroom) {

  958.             room=highroom*2;

  959.         } else {

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

  961.         }

  962.         if (val) {

  963.             floor1_flag[low_neigh_offs]=1;

  964.             floor1_flag[high_neigh_offs]=1;

  965.             floor1_flag[i]=1;

  966.             if (val>=room) {

  967.                 if (highroom > lowroom) {

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

  969.                 } else {

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

  971.                 }

  972.             } else {

  973.                 if (val & 1) {

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

  975.                 } else {

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

  977.                 }

  978.             }

  979.         } else {

  980.             floor1_flag[i]=0;

  981.             floor1_Y_final[i]=predicted;

  982.         }

  983. 

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

  985.     }

  986. 

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

  988. 

  989.     hx=0;

  990.     lx=0;

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

  992. 

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

  994. 

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

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

  997. 

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

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

  1000. 

  1001.             hy=floor1_Y_final[floor_x_sort[i]]*vf->multiplier;

  1002.             hx=vf->x_list[floor_x_sort[i]];

  1003. 

  1004.             dy=hy-ly;

  1005.             adx=hx-lx;

  1006.             ady= (dy<0) ? -dy:dy;//ABS(dy);

  1007.             base=dy/adx;

  1008. 

  1009.             AV_DEBUG(" dy %d  adx %d base %d = %d \n", dy, adx, base, dy/adx);

  1010. 

  1011.             x=lx;

  1012.             y=ly;

  1013.             err=0;

  1014.             if (dy<0) {

  1015.                 sy=base-1;

  1016.             } else {

  1017.                 sy=base+1;

  1018.             }

  1019.             ady=ady-(base<0 ? -base : base)*adx;

  1020.             vec[x]=floor1_inverse_db_table[y];

  1021. 

  1022.             AV_DEBUG(" vec[ %d ] = %d \n", x, y);

  1023. 

  1024.             for(x=lx+1;(x<hx) && (x<vf->x_list[1]);++x) {

  1025.                 err+=ady;

  1026.                 if (err>=adx) {

  1027.                     err-=adx;

  1028.                     y+=sy;

  1029.                 } else {

  1030.                     y+=base;

  1031.                 }

  1032.                 vec[x]=floor1_inverse_db_table[y];

  1033. 

  1034.                 AV_DEBUG(" vec[ %d ] = %d \n", x, y);

  1035.             }

  1036. 

  1037. /*            for(j=1;j<hx-lx+1;++j) {  // iterating render_point

  1038.                 dy=hy-ly;

  1039.                 adx=hx-lx;

  1040.                 ady= dy<0 ? -dy : dy;

  1041.                 err=ady*j;

  1042.                 off=err/adx;

  1043.                 if (dy<0) {

  1044.                     predicted=ly-off;

  1045.                 } else {

  1046.                     predicted=ly+off;

  1047.                 }

  1048.                 if (lx+j < vf->x_list[1]) {

  1049.                     vec[lx+j]=floor1_inverse_db_table[predicted];

  1050.                 }

  1051.             }*/

  1052. 

  1053.             lx=hx;

  1054.             ly=hy;

  1055.         }

  1056.     }

  1057. 

  1058.     if (hx<vf->x_list[1]) {

  1059.         for(i=hx;i<vf->x_list[1];++i) {

  1060.             vec[i]=floor1_inverse_db_table[hy];

  1061.         }

  1062.     }

  1063. 

  1064.     AV_DEBUG(" Floor decoded\n");

  1065. 

  1066.     return 0;

  1067. }

  1068. 

  1069. // Read and decode residue

  1070. 

  1071. 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) {

  1072.     GetBitContext *gb=&vc->gb;

  1073.     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;

  1074.     uint_fast16_t n_to_read=vr->end-vr->begin;

  1075.     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;

  1076.     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];

  1077.     uint_fast8_t pass;

  1078.     uint_fast8_t ch_used;

  1079.     uint_fast8_t i,j,l;

  1080.     uint_fast16_t k;

  1081. 

  1082.     if (vr->type==2) {

  1083.         for(j=1;j<ch;++j) {

  1084.                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input

  1085.         }

  1086.         if (do_not_decode[0]) return 0;

  1087.         ch_used=1;

  1088.     } else {

  1089.         ch_used=ch;

  1090.     }

  1091. 

  1092.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1093. 

  1094.     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?

  1095.         uint_fast16_t voffset;

  1096.         uint_fast16_t partition_count;

  1097.         uint_fast16_t j_times_ptns_to_read;

  1098. 

  1099.         voffset=vr->begin;

  1100.         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error

  1101.             if (!pass) {

  1102.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1103.                     if (!do_not_decode[j]) {

  1104.                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1105.                         V_NB_BITS, vc->codebooks[vr->classbook].maxdepth);

  1106. 

  1107.                         AV_DEBUG("Classword: %d \n", temp);

  1108. 

  1109.                         for(i=0;i<c_p_c;++i) {

  1110.                             uint_fast32_t temp2;

  1111. 

  1112.                             temp2=temp/vr->classifications;

  1113.                             classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;

  1114.                             temp=temp2;

  1115.                         }

  1116.                     }

  1117.                     j_times_ptns_to_read+=ptns_to_read;

  1118.                 }

  1119.             }

  1120.             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {

  1121.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1122.                     uint_fast16_t voffs;

  1123. 

  1124.                     if (!do_not_decode[j]) {

  1125.                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];

  1126.                         int_fast16_t vqbook=vr->books[vqclass][pass];

  1127. 

  1128.                         if (vqbook>=0) {

  1129.                             uint_fast16_t coffs;

  1130. 

  1131.                             if (vr->type==0) {

  1132.                                 uint_fast16_t step=vr->partition_size/vc->codebooks[vqbook].dimensions;

  1133. 

  1134.                                 voffs=voffset+j*vlen;

  1135.                                 for(k=0;k<step;++k) {

  1136.                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,

  1137.                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;

  1138.                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l) {

  1139.                                         vec[voffs+k+l*step]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH

  1140.                                     }

  1141.                                 }

  1142.                             }

  1143.                             else if (vr->type==1) {

  1144.                                 voffs=voffset+j*vlen;

  1145.                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {

  1146.                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,

  1147.                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;

  1148.                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {

  1149.                                         vec[voffs]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH

  1150. 

  1151.                                         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);

  1152.                                     }

  1153.                                 }

  1154.                             }

  1155.                             else if (vr->type==2 && ch==2) { // most frequent case optimized

  1156.                                 voffs=voffset;

  1157. 

  1158.                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {

  1159.                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,

  1160.                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;

  1161.                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {

  1162.                                         vec[(voffs>>1)+((voffs&1) ? vlen : 0)]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH

  1163. 

  1164.                                         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);

  1165.                                     }

  1166.                                 }

  1167. 

  1168.                             }

  1169.                             else if (vr->type==2) {

  1170.                                 voffs=voffset;

  1171. 

  1172.                                 for(k=0;k<vr->partition_size/vc->codebooks[vqbook].dimensions;++k) {

  1173.                                     coffs=get_vlc2(gb, vc->codebooks[vqbook].vlc.table,

  1174.                                     V_NB_BITS, vc->codebooks[vr->classbook].maxdepth) * vc->codebooks[vqbook].dimensions;

  1175.                                     for(l=0;l<vc->codebooks[vqbook].dimensions;++l, ++voffs) {

  1176.                                         vec[voffs/ch+(voffs%ch)*vlen]+=vc->codebooks[vqbook].codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %

  1177. 

  1178.                                         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);

  1179.                                     }

  1180.                                 }

  1181.                             } else {

  1182.                                 av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1183.                                 return 1;

  1184.                             }

  1185.                         }

  1186.                     }

  1187.                     j_times_ptns_to_read+=ptns_to_read;

  1188.                 }

  1189.                 ++partition_count;

  1190.                 voffset+=vr->partition_size;

  1191.             }

  1192.         }

  1193.     }

  1194.     return 0;

  1195. }

  1196. 

  1197. // Decode the audio packet using the functions above

  1198. 

  1199. static int vorbis_parse_audio_packet(vorbis_context *vc) {

  1200.     GetBitContext *gb=&vc->gb;

  1201. 

  1202.     uint_fast8_t previous_window=0,next_window=0;

  1203.     uint_fast8_t mode_number;

  1204.     uint_fast16_t blocksize;

  1205.     int_fast32_t i,j;

  1206.     uint_fast8_t no_residue[vc->audio_channels];

  1207.     uint_fast8_t do_not_decode[vc->audio_channels];

  1208.     vorbis_mapping *mapping;

  1209.     float *ch_res_ptr=vc->channel_residues;

  1210.     float *ch_floor_ptr=vc->channel_floors;

  1211.     uint_fast8_t res_chan[vc->audio_channels];

  1212.     uint_fast8_t res_num=0;

  1213.     int_fast16_t retlen=0;

  1214.     uint_fast16_t saved_start=0;

  1215. 

  1216.     if (get_bits1(gb)) {

  1217.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1218.         return -1; // packet type not audio

  1219.     }

  1220. 

  1221.     if (vc->mode_count==1) {

  1222.         mode_number=0;

  1223.     } else {

  1224.         mode_number=get_bits(gb, ilog(vc->mode_count-1));

  1225.     }

  1226.     mapping=&vc->mappings[vc->modes[mode_number].mapping];

  1227. 

  1228.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1229. 

  1230.     if (vc->modes[mode_number].blockflag) {

  1231.         previous_window=get_bits1(gb);

  1232.         next_window=get_bits1(gb);

  1233.     }

  1234. 

  1235.     blocksize=vc->modes[mode_number].blockflag ? vc->blocksize_1 : vc->blocksize_0;

  1236.     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1237.     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1238. 

  1239. // Decode floor(1)

  1240. 

  1241.     for(i=0;i<vc->audio_channels;++i) {

  1242.         vorbis_floor *floor;

  1243.         if (mapping->submaps>1) {

  1244.             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1245.         } else {

  1246.             floor=&vc->floors[mapping->submap_floor[0]];

  1247.         }

  1248. 

  1249.         no_residue[i]=vorbis_floor1_decode(vc, floor, ch_floor_ptr);

  1250.         ch_floor_ptr+=blocksize/2;

  1251.     }

  1252. 

  1253. // Nonzero vector propagate

  1254. 

  1255.     for(i=mapping->coupling_steps-1;i>=0;--i) {

  1256.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1257.             no_residue[mapping->magnitude[i]]=0;

  1258.             no_residue[mapping->angle[i]]=0;

  1259.         }

  1260.     }

  1261. 

  1262. // Decode residue

  1263. 

  1264.     for(i=0;i<mapping->submaps;++i) {

  1265.         vorbis_residue *residue;

  1266.         uint_fast8_t ch=0;

  1267. 

  1268.         for(j=0;j<vc->audio_channels;++j) {

  1269.             if ((mapping->submaps==1) || (i=mapping->mux[j])) {

  1270.                 res_chan[j]=res_num;

  1271.                 if (no_residue[j]) {

  1272.                     do_not_decode[ch]=1;

  1273.                 } else {

  1274.                     do_not_decode[ch]=0;

  1275.                 }

  1276.                 ++ch;

  1277.                 ++res_num;

  1278.             }

  1279.         }

  1280.         residue=&vc->residues[mapping->submap_residue[i]];

  1281.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1282. 

  1283.         ch_res_ptr+=ch*blocksize/2;

  1284.     }

  1285. 

  1286. // Inverse coupling

  1287. 

  1288.     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed

  1289.         float *mag, *ang;

  1290. 

  1291.         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;

  1292.         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;

  1293.         for(j=0;j<blocksize/2;++j) {

  1294.             float temp;

  1295.             if (mag[j]>0.0) {

  1296.                 if (ang[j]>0.0) {

  1297.                     ang[j]=mag[j]-ang[j];

  1298.                 } else {

  1299.                     temp=ang[j];

  1300.                     ang[j]=mag[j];

  1301.                     mag[j]+=temp;

  1302.                 }

  1303.             } else {

  1304.                 if (ang[j]>0.0) {

  1305.                     ang[j]+=mag[j];

  1306.                 } else {

  1307.                     temp=ang[j];

  1308.                     ang[j]=mag[j];

  1309.                     mag[j]-=temp;

  1310.                 }

  1311.             }

  1312.         }

  1313.     }

  1314. 

  1315. // Dotproduct

  1316. 

  1317.     for(j=0, ch_floor_ptr=vc->channel_floors;j<vc->audio_channels;++j,ch_floor_ptr+=blocksize/2) {

  1318.         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;

  1319. 

  1320.         for(i=0;i<blocksize/2;++i) {

  1321.             ch_floor_ptr[i]*=ch_res_ptr[i]; //FPMATH

  1322.         }

  1323.     }

  1324. 

  1325. // MDCT, overlap/add, save data for next overlapping  FPMATH

  1326. 

  1327.     for(j=0;j<vc->audio_channels;++j) {

  1328.         uint_fast8_t step=vc->audio_channels;

  1329.         uint_fast16_t k;

  1330.         float *saved=vc->saved+j*vc->blocksize_1/2;

  1331.         float *ret=vc->ret;

  1332.         const float *lwin=vc->lwin;

  1333.         const float *swin=vc->swin;

  1334.         float *buf=vc->buf;

  1335.         float *buf_tmp=vc->buf_tmp;

  1336. 

  1337.         ch_floor_ptr=vc->channel_floors+j*blocksize/2;

  1338. 

  1339.         saved_start=vc->saved_start;

  1340. 

  1341.         ff_imdct_calc(vc->modes[mode_number].blockflag ? &vc->mdct1 : &vc->mdct0, buf, ch_floor_ptr, buf_tmp);

  1342. 

  1343.         if (vc->modes[mode_number].blockflag) {

  1344.             // -- overlap/add

  1345.             if (previous_window) {

  1346.                 for(k=j, i=0;i<vc->blocksize_1/2;++i, k+=step) {

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

  1348.                 }

  1349.                 retlen=vc->blocksize_1/2;

  1350.             } else {

  1351.                 for(k=j, i=0;i<vc->blocksize_0/2;++i, k+=step) {

  1352.                     ret[k]=saved[i]+buf[(vc->blocksize_1-vc->blocksize_0)/4+i]*swin[i];

  1353.                 }

  1354.                 for(i=0;i<(vc->blocksize_1-vc->blocksize_0)/4;++i, k+=step) {

  1355.                     ret[k]=buf[vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4+i];

  1356.                 }

  1357.                 retlen=vc->blocksize_0/2+(vc->blocksize_1-vc->blocksize_0)/4;

  1358.             }

  1359.             // -- save

  1360.             if (next_window) {

  1361.                 for(i=0;i<vc->blocksize_1/2;++i) {

  1362.                     saved[i]=buf[vc->blocksize_1/2+i]*lwin[vc->blocksize_1/2-1-i];

  1363.                 }

  1364.                 saved_start=0;

  1365.             } else {

  1366.                 saved_start=(vc->blocksize_1-vc->blocksize_0)/4;

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

  1368.                     saved[i]=buf[vc->blocksize_1/2+i];

  1369.                 }

  1370.                 for(i=0;i<vc->blocksize_0/2;++i) {

  1371.                     saved[saved_start+i]=buf[vc->blocksize_1/2+saved_start+i]*swin[vc->blocksize_0/2-1-i];

  1372.                 }

  1373.             }

  1374.         } else {

  1375.             // --overlap/add

  1376.             for(k=j, i=0;i<saved_start;++i, k+=step) {

  1377.                 ret[k]=saved[i];

  1378.             }

  1379.             for(i=0;i<vc->blocksize_0/2;++i, k+=step) {

  1380.                 ret[k]=saved[saved_start+i]+buf[i]*swin[i];

  1381.             }

  1382.             retlen=saved_start+vc->blocksize_0/2;

  1383.             // -- save

  1384.             for(i=0;i<vc->blocksize_0/2;++i) {

  1385.                 saved[i]=buf[vc->blocksize_0/2+i]*swin[vc->blocksize_0/2-1-i];

  1386.             }

  1387.             saved_start=0;

  1388.         }

  1389.     }

  1390.     vc->saved_start=saved_start;

  1391. 

  1392.     return retlen*vc->audio_channels;

  1393. }

  1394. 

  1395. // Return the decoded audio packet through the standard api

  1396. 

  1397. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1398.                         void *data, int *data_size,

  1399.                         uint8_t *buf, int buf_size)

  1400. {

  1401.     vorbis_context *vc = avccontext->priv_data ;

  1402.     GetBitContext *gb = &(vc->gb);

  1403. 

  1404.     int_fast16_t i, len;

  1405. 

  1406.     if(!buf_size){

  1407.         return 0;

  1408.     }

  1409. 

  1410.     AV_DEBUG("packet length %d \n", buf_size);

  1411. 

  1412.     init_get_bits(gb, buf, buf_size*8);

  1413. 

  1414.     len=vorbis_parse_audio_packet(vc);

  1415. 

  1416.     if (len<=0) {

  1417.         *data_size=0;

  1418.         return buf_size;

  1419.     }

  1420. 

  1421.     if (!vc->first_frame) {

  1422.         vc->first_frame=1;

  1423.         *data_size=0;

  1424.         return buf_size ;

  1425.     }

  1426. 

  1427.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1428. 

  1429.     for(i=0;i<len;++i) {

  1430.         int_fast32_t tmp;

  1431. 

  1432.         tmp=vc->ret[i]*32768;

  1433.         if (tmp>32767) tmp=32767;

  1434.         if (tmp<-32768) tmp=-32768;

  1435.         ((int16_t*)data)[i]=tmp;

  1436.     }

  1437.     *data_size=len*2;

  1438. 

  1439.     return buf_size ;

  1440. }

  1441. 

  1442. // Close decoder

  1443. 

  1444. static int vorbis_decode_close(AVCodecContext *avccontext) {

  1445.     vorbis_context *vc = avccontext->priv_data;

  1446. 

  1447.     vorbis_free(vc);

  1448. 

  1449.     return 0 ;

  1450. }

  1451. 

  1452. AVCodec vorbis_decoder = {

  1453.     "vorbis",

  1454.     CODEC_TYPE_AUDIO,

  1455.     CODEC_ID_VORBIS,

  1456.     sizeof(vorbis_context),

  1457.     vorbis_decode_init,

  1458.     NULL,

  1459.     vorbis_decode_close,

  1460.     vorbis_decode_frame,

  1461. };