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FFmpeg/libavcodec/vorbis_dec.c

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  1. /**

  2.  * @file libavcodec/vorbis_dec.c

  3.  * Vorbis I decoder

  4.  * @author Denes Balatoni  ( dbalatoni programozo hu )

  5. 

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

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

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

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

  19.  * License along with FFmpeg; if not, write to the Free Software

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

  21.  */

  22. 

  23. #undef V_DEBUG

  24. //#define V_DEBUG

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

  26. 

  27. #include <math.h>

  28. 

  29. #define ALT_BITSTREAM_READER_LE

  30. #include "avcodec.h"

  31. #include "get_bits.h"

  32. #include "dsputil.h"

  33. 

  34. #include "vorbis.h"

  35. #include "xiph.h"

  36. 

  37. #define V_NB_BITS 8

  38. #define V_NB_BITS2 11

  39. #define V_MAX_VLCS (1<<16)

  40. 

  41. #ifndef V_DEBUG

  42. #define AV_DEBUG(...)

  43. #endif

  44. 

  45. #undef NDEBUG

  46. #include <assert.h>

  47. 

  48. typedef struct {

  49.     uint_fast8_t dimensions;

  50.     uint_fast8_t lookup_type;

  51.     uint_fast8_t maxdepth;

  52.     VLC vlc;

  53.     float *codevectors;

  54.     unsigned int nb_bits;

  55. } vorbis_codebook;

  56. 

  57. typedef union vorbis_floor_u vorbis_floor_data;

  58. typedef struct vorbis_floor0_s vorbis_floor0;

  59. typedef struct vorbis_floor1_s vorbis_floor1;

  60. struct vorbis_context_s;

  61. typedef

  62. uint_fast8_t (* vorbis_floor_decode_func)

  63.              (struct vorbis_context_s *, vorbis_floor_data *, float *);

  64. typedef struct {

  65.     uint_fast8_t floor_type;

  66.     vorbis_floor_decode_func decode;

  67.     union vorbis_floor_u

  68.     {

  69.         struct vorbis_floor0_s

  70.         {

  71.             uint_fast8_t order;

  72.             uint_fast16_t rate;

  73.             uint_fast16_t bark_map_size;

  74.             int_fast32_t * map[2];

  75.             uint_fast32_t map_size[2];

  76.             uint_fast8_t amplitude_bits;

  77.             uint_fast8_t amplitude_offset;

  78.             uint_fast8_t num_books;

  79.             uint_fast8_t * book_list;

  80.             float * lsp;

  81.         } t0;

  82.         struct vorbis_floor1_s

  83.         {

  84.             uint_fast8_t partitions;

  85.             uint_fast8_t maximum_class;

  86.             uint_fast8_t partition_class[32];

  87.             uint_fast8_t class_dimensions[16];

  88.             uint_fast8_t class_subclasses[16];

  89.             uint_fast8_t class_masterbook[16];

  90.             int_fast16_t subclass_books[16][8];

  91.             uint_fast8_t multiplier;

  92.             uint_fast16_t x_list_dim;

  93.             vorbis_floor1_entry * list;

  94.         } t1;

  95.     } data;

  96. } vorbis_floor;

  97. 

  98. typedef struct {

  99.     uint_fast16_t type;

  100.     uint_fast32_t begin;

  101.     uint_fast32_t end;

  102.     uint_fast32_t partition_size;

  103.     uint_fast8_t classifications;

  104.     uint_fast8_t classbook;

  105.     int_fast16_t books[64][8];

  106.     uint_fast8_t maxpass;

  107. } vorbis_residue;

  108. 

  109. typedef struct {

  110.     uint_fast8_t submaps;

  111.     uint_fast16_t coupling_steps;

  112.     uint_fast8_t *magnitude;

  113.     uint_fast8_t *angle;

  114.     uint_fast8_t *mux;

  115.     uint_fast8_t submap_floor[16];

  116.     uint_fast8_t submap_residue[16];

  117. } vorbis_mapping;

  118. 

  119. typedef struct {

  120.     uint_fast8_t blockflag;

  121.     uint_fast16_t windowtype;

  122.     uint_fast16_t transformtype;

  123.     uint_fast8_t mapping;

  124. } vorbis_mode;

  125. 

  126. typedef struct vorbis_context_s {

  127.     AVCodecContext *avccontext;

  128.     GetBitContext gb;

  129.     DSPContext dsp;

  130. 

  131.     FFTContext mdct[2];

  132.     uint_fast8_t first_frame;

  133.     uint_fast32_t version;

  134.     uint_fast8_t audio_channels;

  135.     uint_fast32_t audio_samplerate;

  136.     uint_fast32_t bitrate_maximum;

  137.     uint_fast32_t bitrate_nominal;

  138.     uint_fast32_t bitrate_minimum;

  139.     uint_fast32_t blocksize[2];

  140.     const float * win[2];

  141.     uint_fast16_t codebook_count;

  142.     vorbis_codebook *codebooks;

  143.     uint_fast8_t floor_count;

  144.     vorbis_floor *floors;

  145.     uint_fast8_t residue_count;

  146.     vorbis_residue *residues;

  147.     uint_fast8_t mapping_count;

  148.     vorbis_mapping *mappings;

  149.     uint_fast8_t mode_count;

  150.     vorbis_mode *modes;

  151.     uint_fast8_t mode_number; // mode number for the current packet

  152.     uint_fast8_t previous_window;

  153.     float *channel_residues;

  154.     float *channel_floors;

  155.     float *saved;

  156.     uint_fast32_t add_bias; // for float->int conversion

  157.     uint_fast32_t exp_bias;

  158. } vorbis_context;

  159. 

  160. /* Helper functions */

  161. 

  162. #define BARK(x) \

  163.     (13.1f*atan(0.00074f*(x))+2.24f*atan(1.85e-8f*(x)*(x))+1e-4f*(x))

  164. 

  165. static float vorbisfloat2float(uint_fast32_t val) {

  166.     double mant=val&0x1fffff;

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

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

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

  170. }

  171. 

  172. 

  173. // Free all allocated memory -----------------------------------------

  174. 

  175. static void vorbis_free(vorbis_context *vc) {

  176.     int_fast16_t i;

  177. 

  178.     av_freep(&vc->channel_residues);

  179.     av_freep(&vc->channel_floors);

  180.     av_freep(&vc->saved);

  181. 

  182.     av_freep(&vc->residues);

  183.     av_freep(&vc->modes);

  184. 

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

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

  187. 

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

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

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

  191.     }

  192.     av_freep(&vc->codebooks);

  193. 

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

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

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

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

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

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

  200.         }

  201.         else {

  202.             av_free(vc->floors[i].data.t1.list);

  203.         }

  204.     }

  205.     av_freep(&vc->floors);

  206. 

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

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

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

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

  211.     }

  212.     av_freep(&vc->mappings);

  213. }

  214. 

  215. // Parse setup header -------------------------------------------------

  216. 

  217. // Process codebooks part

  218. 

  219. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc) {

  220.     uint_fast16_t cb;

  221.     uint8_t *tmp_vlc_bits;

  222.     uint32_t *tmp_vlc_codes;

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

  224. 

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

  226. 

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

  228. 

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

  230.     tmp_vlc_bits =av_mallocz(V_MAX_VLCS * sizeof(uint8_t));

  231.     tmp_vlc_codes=av_mallocz(V_MAX_VLCS * sizeof(uint32_t));

  232. 

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

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

  235.         uint_fast8_t ordered;

  236.         uint_fast32_t t, used_entries=0;

  237.         uint_fast32_t entries;

  238. 

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

  240. 

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

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

  243.             goto error;

  244.         }

  245. 

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

  247.         if (codebook_setup->dimensions>16||codebook_setup->dimensions==0) {

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

  249.             goto error;

  250.         }

  251.         entries=get_bits(gb, 24);

  252.         if (entries>V_MAX_VLCS) {

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

  254.             goto error;

  255.         }

  256. 

  257.         ordered=get_bits1(gb);

  258. 

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

  260. 

  261.         if (!ordered) {

  262.             uint_fast16_t ce;

  263.             uint_fast8_t flag;

  264.             uint_fast8_t sparse=get_bits1(gb);

  265. 

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

  267. 

  268.             if (sparse) {

  269.                 AV_DEBUG(" sparse \n");

  270. 

  271.                 used_entries=0;

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

  273.                     flag=get_bits1(gb);

  274.                     if (flag) {

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

  276.                         ++used_entries;

  277.                     }

  278.                     else tmp_vlc_bits[ce]=0;

  279.                 }

  280.             } else {

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

  282. 

  283.                 used_entries=entries;

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

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

  286.                 }

  287.             }

  288.         } else {

  289.             uint_fast16_t current_entry=0;

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

  291. 

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

  293. 

  294.             used_entries=entries;

  295.             for(;current_entry<used_entries && current_length <= 32;++current_length) {

  296.                 uint_fast16_t i, number;

  297. 

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

  299. 

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

  301. 

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

  303. 

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

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

  306.                 }

  307. 

  308.                 current_entry+=number;

  309.             }

  310.             if (current_entry>used_entries) {

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

  312.                 goto error;

  313.             }

  314.         }

  315. 

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

  317. 

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

  319. 

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

  321. 

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

  323.             uint_fast16_t i, j, k;

  324.             uint_fast16_t codebook_lookup_values=ff_vorbis_nth_root(entries, codebook_setup->dimensions);

  325.             uint_fast16_t codebook_multiplicands[codebook_lookup_values];

  326. 

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

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

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

  330.             uint_fast8_t codebook_sequence_p=get_bits1(gb);

  331. 

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

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

  334. 

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

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

  337. 

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

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

  340.             }

  341. 

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

  343.             codebook_setup->codevectors=used_entries ? av_mallocz(used_entries*codebook_setup->dimensions * sizeof(float)) : NULL;

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

  345.                 uint_fast8_t dim=codebook_setup->dimensions;

  346. 

  347.                 if (tmp_vlc_bits[i]) {

  348.                     float last=0.0;

  349.                     uint_fast32_t lookup_offset=i;

  350. 

  351. #ifdef V_DEBUG

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

  353. #endif

  354. 

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

  356.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  358.                         if (codebook_sequence_p) {

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

  360.                         }

  361.                         lookup_offset/=codebook_lookup_values;

  362.                     }

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

  364. 

  365. #ifdef V_DEBUG

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

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

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

  369.                     }

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

  371. #endif

  372. 

  373.                     ++j;

  374.                 }

  375.             }

  376.             if (j!=used_entries) {

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

  378.                 goto error;

  379.             }

  380.             entries=used_entries;

  381.         }

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

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

  384.             goto error;

  385.         }

  386. 

  387. // Initialize VLC table

  388.         if (ff_vorbis_len2vlc(tmp_vlc_bits, tmp_vlc_codes, entries)) {

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

  390.             goto error;

  391.         }

  392.         codebook_setup->maxdepth=0;

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

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

  395. 

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

  397.         else                                       codebook_setup->nb_bits=V_NB_BITS;

  398. 

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

  400. 

  401.         if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {

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

  403.             goto error;

  404.         }

  405.     }

  406. 

  407.     av_free(tmp_vlc_bits);

  408.     av_free(tmp_vlc_codes);

  409.     return 0;

  410. 

  411. // Error:

  412. error:

  413.     av_free(tmp_vlc_bits);

  414.     av_free(tmp_vlc_codes);

  415.     return 1;

  416. }

  417. 

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

  419. 

  420. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc) {

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

  422.     uint_fast8_t i;

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

  424. 

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

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

  427. 

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

  429. 

  430.         if (vorbis_tdtransform) {

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

  432.             return 1;

  433.         }

  434.     }

  435.     return 0;

  436. }

  437. 

  438. // Process floors part

  439. 

  440. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  441.                                          vorbis_floor_data *vfu, float *vec);

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

  443. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  444.                                          vorbis_floor_data *vfu, float *vec);

  445. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc) {

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

  447.     uint_fast16_t i,j,k;

  448. 

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

  450. 

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

  452. 

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

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

  455. 

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

  457. 

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

  459. 

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

  461.             uint_fast8_t maximum_class=0;

  462.             uint_fast8_t rangebits;

  463.             uint_fast16_t floor1_values=2;

  464. 

  465.             floor_setup->decode=vorbis_floor1_decode;

  466. 

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

  468. 

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

  470. 

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

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

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

  474. 

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

  476. 

  477.             }

  478. 

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

  480. 

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

  482. 

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

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

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

  486. 

  487.                 AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->data.t1.class_dimensions[j], floor_setup->data.t1.class_subclasses[j]);

  488. 

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

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

  491. 

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

  493.                 }

  494. 

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

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

  497. 

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

  499.                 }

  500.             }

  501. 

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

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

  504. 

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

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

  507.             }

  508. 

  509.             floor_setup->data.t1.list=av_mallocz(floor_setup->data.t1.x_list_dim * sizeof(vorbis_floor1_entry));

  510. 

  511. 

  512.             rangebits=get_bits(gb, 4);

  513.             floor_setup->data.t1.list[0].x = 0;

  514.             floor_setup->data.t1.list[1].x = (1<<rangebits);

  515. 

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

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

  518.                     floor_setup->data.t1.list[floor1_values].x=get_bits(gb, rangebits);

  519. 

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

  521.                 }

  522.             }

  523. 

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

  525.             ff_vorbis_ready_floor1_list(floor_setup->data.t1.list, floor_setup->data.t1.x_list_dim);

  526.         }

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

  528.             uint_fast8_t max_codebook_dim=0;

  529. 

  530.             floor_setup->decode=vorbis_floor0_decode;

  531. 

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

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

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

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

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

  537.              * 2^0 - 1 == 0                             */

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

  539.               av_log(vc->avccontext, AV_LOG_ERROR,

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

  541.               return 1;

  542.             }

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

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

  545. 

  546.             /* allocate mem for booklist */

  547.             floor_setup->data.t0.book_list=

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

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

  550.             /* read book indexes */

  551.             {

  552.                 int idx;

  553.                 uint_fast8_t book_idx;

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

  555.                     book_idx=get_bits(gb, 8);

  556.                     if (book_idx>=vc->codebook_count)

  557.                         return 1;

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

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

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

  561.                 }

  562.             }

  563. 

  564.             create_map( vc, i );

  565. 

  566.             /* allocate mem for lsp coefficients */

  567.             {

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

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

  570.                 floor_setup->data.t0.lsp=

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

  572.                               * sizeof(float));

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

  574.             }

  575. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  589.             {

  590.               int idx;

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

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

  593.                   idx+1,

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

  595.               }

  596.             }

  597. #endif

  598.         }

  599.         else {

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

  601.             return 1;

  602.         }

  603.     }

  604.     return 0;

  605. }

  606. 

  607. // Process residues part

  608. 

  609. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){

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

  611.     uint_fast8_t i, j, k;

  612. 

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

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

  615. 

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

  617. 

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

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

  620.         uint_fast8_t cascade[64];

  621.         uint_fast8_t high_bits;

  622.         uint_fast8_t low_bits;

  623. 

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

  625. 

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

  627. 

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

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

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

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

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

  633.         if (res_setup->classbook>=vc->codebook_count) {

  634.             av_log(vc->avccontext, AV_LOG_ERROR, "classbook value %d out of range. \n", res_setup->classbook);

  635.             return 1;

  636.         }

  637. 

  638.         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,

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

  640. 

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

  642.             high_bits=0;

  643.             low_bits=get_bits(gb, 3);

  644.             if (get_bits1(gb)) {

  645.                 high_bits=get_bits(gb, 5);

  646.             }

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

  648. 

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

  650.         }

  651. 

  652.         res_setup->maxpass=0;

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

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

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

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

  657. 

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

  659. 

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

  661.                         res_setup->maxpass=k;

  662.                     }

  663.                 } else {

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

  665.                 }

  666.             }

  667.         }

  668.     }

  669.     return 0;

  670. }

  671. 

  672. // Process mappings part

  673. 

  674. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc) {

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

  676.     uint_fast8_t i, j;

  677. 

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

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

  680. 

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

  682. 

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

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

  685. 

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

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

  688.             return 1;

  689.         }

  690.         if (get_bits1(gb)) {

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

  692.         } else {

  693.             mapping_setup->submaps=1;

  694.         }

  695. 

  696.         if (get_bits1(gb)) {

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

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

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

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

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

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

  703.                 if (mapping_setup->magnitude[j]>=vc->audio_channels) {

  704.                     av_log(vc->avccontext, AV_LOG_ERROR, "magnitude channel %d out of range. \n", mapping_setup->magnitude[j]);

  705.                     return 1;

  706.                 }

  707.                 if (mapping_setup->angle[j]>=vc->audio_channels) {

  708.                     av_log(vc->avccontext, AV_LOG_ERROR, "angle channel %d out of range. \n", mapping_setup->angle[j]);

  709.                     return 1;

  710.                 }

  711.             }

  712.         } else {

  713.             mapping_setup->coupling_steps=0;

  714.         }

  715. 

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

  717. 

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

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

  720.             return 1; // following spec.

  721.         }

  722. 

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

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

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

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

  727.             }

  728.         }

  729. 

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

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

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

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

  734. 

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

  736.         }

  737.     }

  738.     return 0;

  739. }

  740. 

  741. // Process modes part

  742. 

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

  744. {

  745.     vorbis_floor * floors=vc->floors;

  746.     vorbis_floor0 * vf;

  747.     int idx;

  748.     int_fast8_t blockflag;

  749.     int_fast32_t * map;

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

  751. 

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

  753.     {

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

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

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

  757. 

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

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

  760. 

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

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

  763.                               ((vf->bark_map_size)/

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

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

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

  767.         }

  768.     }

  769.     map[n]=-1;

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

  771.     }

  772. 

  773. #   ifdef V_DEBUG

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

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

  776.                  idx, map[idx]);

  777.     }

  778. #   endif

  779. }

  780. 

  781. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc) {

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

  783.     uint_fast8_t i;

  784. 

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

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

  787. 

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

  789. 

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

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

  792. 

  793.         mode_setup->blockflag=get_bits1(gb);

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

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

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

  797.         if (mode_setup->mapping>=vc->mapping_count) {

  798.             av_log(vc->avccontext, AV_LOG_ERROR, "mode mapping value %d out of range. \n", mode_setup->mapping);

  799.             return 1;

  800.         }

  801. 

  802.         AV_DEBUG(" %d mode: blockflag %d, windowtype %d, transformtype %d, mapping %d \n", i, mode_setup->blockflag, mode_setup->windowtype, mode_setup->transformtype, mode_setup->mapping);

  803.     }

  804.     return 0;

  805. }

  806. 

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

  808. 

  809. static int vorbis_parse_setup_hdr(vorbis_context *vc) {

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

  811. 

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

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

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

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

  816.         return 1;

  817.     }

  818. 

  819.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  821.         return 2;

  822.     }

  823.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  825.         return 3;

  826.     }

  827.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  829.         return 4;

  830.     }

  831.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  833.         return 5;

  834.     }

  835.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  837.         return 6;

  838.     }

  839.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  841.         return 7;

  842.     }

  843.     if (!get_bits1(gb)) {

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

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

  846.     }

  847. 

  848.     return 0;

  849. }

  850. 

  851. // Process the identification header

  852. 

  853. static int vorbis_parse_id_hdr(vorbis_context *vc){

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

  855.     uint_fast8_t bl0, bl1;

  856. 

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

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

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

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

  861.         return 1;

  862.     }

  863. 

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

  865.     vc->audio_channels=get_bits(gb, 8);

  866.     if(vc->audio_channels <= 0){

  867.         av_log(vc->avccontext, AV_LOG_ERROR, "Invalid number of channels\n");

  868.         return -1;

  869.     }

  870.     vc->audio_samplerate=get_bits_long(gb, 32);

  871.     if(vc->audio_samplerate <= 0){

  872.         av_log(vc->avccontext, AV_LOG_ERROR, "Invalid samplerate\n");

  873.         return -1;

  874.     }

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

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

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

  878.     bl0=get_bits(gb, 4);

  879.     bl1=get_bits(gb, 4);

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

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

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

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

  884.         return 3;

  885.     }

  886.     // output format int16

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

  888.                                              AVCODEC_MAX_AUDIO_FRAME_SIZE) {

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

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

  891.         return 4;

  892.     }

  893.     vc->win[0]=ff_vorbis_vwin[bl0-6];

  894.     vc->win[1]=ff_vorbis_vwin[bl1-6];

  895. 

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

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

  898.         return 2;

  899.     }

  900. 

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

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

  903.     vc->saved           = av_mallocz((vc->blocksize[1]/4)*vc->audio_channels * sizeof(float));

  904.     vc->previous_window=0;

  905. 

  906.     ff_mdct_init(&vc->mdct[0], bl0, 1, vc->exp_bias ? -(1<<15) : -1.0);

  907.     ff_mdct_init(&vc->mdct[1], bl1, 1, vc->exp_bias ? -(1<<15) : -1.0);

  908. 

  909.     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 ",

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

  911. 

  912. /*

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

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

  915.         vc->win[0][i]=sin(0.5*3.14159265358*(sin(((float)i+0.5)/(float)BLK*3.14159265358))*(sin(((float)i+0.5)/(float)BLK*3.14159265358)));

  916.     }

  917. */

  918. 

  919.     return 0;

  920. }

  921. 

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

  923. 

  924. static av_cold int vorbis_decode_init(AVCodecContext *avccontext) {

  925.     vorbis_context *vc = avccontext->priv_data ;

  926.     uint8_t *headers = avccontext->extradata;

  927.     int headers_len=avccontext->extradata_size;

  928.     uint8_t *header_start[3];

  929.     int header_len[3];

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

  931.     int hdr_type;

  932. 

  933.     vc->avccontext = avccontext;

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

  935. 

  936.     if(vc->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {

  937.         vc->add_bias = 385;

  938.         vc->exp_bias = 0;

  939.     } else {

  940.         vc->add_bias = 0;

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

  942.     }

  943. 

  944.     if (!headers_len) {

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

  946.         return -1;

  947.     }

  948. 

  949.     if (ff_split_xiph_headers(headers, headers_len, 30, header_start, header_len) < 0) {

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

  951.         return -1;

  952.     }

  953. 

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

  955.     hdr_type=get_bits(gb, 8);

  956.     if (hdr_type!=1) {

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

  958.         return -1;

  959.     }

  960.     if (vorbis_parse_id_hdr(vc)) {

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

  962.         vorbis_free(vc);

  963.         return -1;

  964.     }

  965. 

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

  967.     hdr_type=get_bits(gb, 8);

  968.     if (hdr_type!=5) {

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

  970.         vorbis_free(vc);

  971.         return -1;

  972.     }

  973.     if (vorbis_parse_setup_hdr(vc)) {

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

  975.         vorbis_free(vc);

  976.         return -1;

  977.     }

  978. 

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

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

  981.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1])>>2;

  982.     avccontext->sample_fmt = SAMPLE_FMT_S16;

  983. 

  984.     return 0 ;

  985. }

  986. 

  987. // Decode audiopackets -------------------------------------------------

  988. 

  989. // Read and decode floor

  990. 

  991. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  992.                                          vorbis_floor_data *vfu, float *vec) {

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

  994.     float * lsp=vf->lsp;

  995.     uint_fast32_t amplitude;

  996.     uint_fast32_t book_idx;

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

  998. 

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

  1000.     if (amplitude>0) {

  1001.         float last = 0;

  1002.         uint_fast16_t lsp_len = 0;

  1003.         uint_fast16_t idx;

  1004.         vorbis_codebook codebook;

  1005. 

  1006.         book_idx=get_bits(&vc->gb, ilog(vf->num_books));

  1007.         if ( book_idx >= vf->num_books ) {

  1008.             av_log( vc->avccontext, AV_LOG_ERROR,

  1009.                     "floor0 dec: booknumber too high!\n" );

  1010.             book_idx= 0;

  1011.             //FIXME: look above

  1012.         }

  1013.         AV_DEBUG( "floor0 dec: booknumber: %u\n", book_idx );

  1014.         codebook=vc->codebooks[vf->book_list[book_idx]];

  1015. 

  1016.         while (lsp_len<vf->order) {

  1017.             int vec_off;

  1018. 

  1019.             AV_DEBUG( "floor0 dec: book dimension: %d\n", codebook.dimensions );

  1020.             AV_DEBUG( "floor0 dec: maximum depth: %d\n", codebook.maxdepth );

  1021.             /* read temp vector */

  1022.             vec_off=get_vlc2(&vc->gb,

  1023.                              codebook.vlc.table,

  1024.                              codebook.nb_bits,

  1025.                              codebook.maxdepth ) *

  1026.                              codebook.dimensions;

  1027.             AV_DEBUG( "floor0 dec: vector offset: %d\n", vec_off );

  1028.             /* copy each vector component and add last to it */

  1029.             for (idx=0; idx<codebook.dimensions; ++idx) {

  1030.                 lsp[lsp_len+idx]=codebook.codevectors[vec_off+idx]+last;

  1031.             }

  1032.             last=lsp[lsp_len+idx-1]; /* set last to last vector component */

  1033. 

  1034.             lsp_len += codebook.dimensions;

  1035.         }

  1036. #ifdef V_DEBUG

  1037.         /* DEBUG: output lsp coeffs */

  1038.         {

  1039.             int idx;

  1040.             for ( idx = 0; idx < lsp_len; ++idx )

  1041.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx] );

  1042.         }

  1043. #endif

  1044. 

  1045.         /* synthesize floor output vector */

  1046.         {

  1047.             int i;

  1048.             int order=vf->order;

  1049.             float wstep=M_PI/vf->bark_map_size;

  1050. 

  1051.             for(i=0;i<order;i++) { lsp[i]=2.0f*cos(lsp[i]); }

  1052. 

  1053.             AV_DEBUG("floor0 synth: map_size=%d; m=%d; wstep=%f\n",

  1054.                      vf->map_size, order, wstep);

  1055. 

  1056.             i=0;

  1057.             while(i<vf->map_size[blockflag]) {

  1058.                 int j, iter_cond=vf->map[blockflag][i];

  1059.                 float p=0.5f;

  1060.                 float q=0.5f;

  1061.                 float two_cos_w=2.0f*cos(wstep*iter_cond); // needed all times

  1062. 

  1063.                 /* similar part for the q and p products */

  1064.                 for(j=0;j+1<order;j+=2) {

  1065.                     q *= lsp[j]  -two_cos_w;

  1066.                     p *= lsp[j+1]-two_cos_w;

  1067.                 }

  1068.                 if(j==order) { // even order

  1069.                     p *= p*(2.0f-two_cos_w);

  1070.                     q *= q*(2.0f+two_cos_w);

  1071.                 }

  1072.                 else { // odd order

  1073.                     q *= two_cos_w-lsp[j]; // one more time for q

  1074. 

  1075.                     /* final step and square */

  1076.                     p *= p*(4.f-two_cos_w*two_cos_w);

  1077.                     q *= q;

  1078.                 }

  1079. 

  1080.                 /* calculate linear floor value */

  1081.                 {

  1082.                     q=exp( (

  1083.                              ( (amplitude*vf->amplitude_offset)/

  1084.                                (((1<<vf->amplitude_bits)-1) * sqrt(p+q)) )

  1085.                              - vf->amplitude_offset ) * .11512925f

  1086.                          );

  1087.                 }

  1088. 

  1089.                 /* fill vector */

  1090.                 do { vec[i]=q; ++i; }while(vf->map[blockflag][i]==iter_cond);

  1091.             }

  1092.         }

  1093.     }

  1094.     else {

  1095.         /* this channel is unused */

  1096.         return 1;

  1097.     }

  1098. 

  1099.     AV_DEBUG(" Floor0 decoded\n");

  1100. 

  1101.     return 0;

  1102. }

  1103. 

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

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

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

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

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

  1109.     uint_fast16_t floor1_Y[vf->x_list_dim];

  1110.     uint_fast16_t floor1_Y_final[vf->x_list_dim];

  1111.     int floor1_flag[vf->x_list_dim];

  1112.     uint_fast8_t class_;

  1113.     uint_fast8_t cdim;

  1114.     uint_fast8_t cbits;

  1115.     uint_fast8_t csub;

  1116.     uint_fast8_t cval;

  1117.     int_fast16_t book;

  1118.     uint_fast16_t offset;

  1119.     uint_fast16_t i,j;

  1120.     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx= (unsigned)dy/adx ?

  1121.     int_fast16_t dy, err;

  1122. 

  1123. 

  1124.     if (!get_bits1(gb)) return 1; // silence

  1125. 

  1126. // Read values (or differences) for the floor's points

  1127. 

  1128.     floor1_Y[0]=get_bits(gb, ilog(range-1));

  1129.     floor1_Y[1]=get_bits(gb, ilog(range-1));

  1130. 

  1131.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1132. 

  1133.     offset=2;

  1134.     for(i=0;i<vf->partitions;++i) {

  1135.         class_=vf->partition_class[i];

  1136.         cdim=vf->class_dimensions[class_];

  1137.         cbits=vf->class_subclasses[class_];

  1138.         csub=(1<<cbits)-1;

  1139.         cval=0;

  1140. 

  1141.         AV_DEBUG("Cbits %d \n", cbits);

  1142. 

  1143.         if (cbits) { // this reads all subclasses for this partition's class

  1144.             cval=get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,

  1145.             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);

  1146.         }

  1147. 

  1148.         for(j=0;j<cdim;++j) {

  1149.             book=vf->subclass_books[class_][cval & csub];

  1150. 

  1151.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1152. 

  1153.             cval=cval>>cbits;

  1154.             if (book>-1) {

  1155.                 floor1_Y[offset+j]=get_vlc2(gb, vc->codebooks[book].vlc.table,

  1156.                 vc->codebooks[book].nb_bits, 3);

  1157.             } else {

  1158.                 floor1_Y[offset+j]=0;

  1159.             }

  1160. 

  1161.             AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);

  1162.         }

  1163.         offset+=cdim;

  1164.     }

  1165. 

  1166. // Amplitude calculation from the differences

  1167. 

  1168.     floor1_flag[0]=1;

  1169.     floor1_flag[1]=1;

  1170.     floor1_Y_final[0]=floor1_Y[0];

  1171.     floor1_Y_final[1]=floor1_Y[1];

  1172. 

  1173.     for(i=2;i<vf->x_list_dim;++i) {

  1174.         uint_fast16_t val, highroom, lowroom, room;

  1175.         uint_fast16_t high_neigh_offs;

  1176.         uint_fast16_t low_neigh_offs;

  1177. 

  1178.         low_neigh_offs=vf->list[i].low;

  1179.         high_neigh_offs=vf->list[i].high;

  1180.         dy=floor1_Y_final[high_neigh_offs]-floor1_Y_final[low_neigh_offs];  // render_point begin

  1181.         adx=vf->list[high_neigh_offs].x-vf->list[low_neigh_offs].x;

  1182.         ady= FFABS(dy);

  1183.         err=ady*(vf->list[i].x-vf->list[low_neigh_offs].x);

  1184.         off=(int16_t)err/(int16_t)adx;

  1185.         if (dy<0) {

  1186.             predicted=floor1_Y_final[low_neigh_offs]-off;

  1187.         } else {

  1188.             predicted=floor1_Y_final[low_neigh_offs]+off;

  1189.         } // render_point end

  1190. 

  1191.         val=floor1_Y[i];

  1192.         highroom=range-predicted;

  1193.         lowroom=predicted;

  1194.         if (highroom < lowroom) {

  1195.             room=highroom*2;

  1196.         } else {

  1197.             room=lowroom*2;   // SPEC mispelling

  1198.         }

  1199.         if (val) {

  1200.             floor1_flag[low_neigh_offs]=1;

  1201.             floor1_flag[high_neigh_offs]=1;

  1202.             floor1_flag[i]=1;

  1203.             if (val>=room) {

  1204.                 if (highroom > lowroom) {

  1205.                     floor1_Y_final[i]=val-lowroom+predicted;

  1206.                 } else {

  1207.                     floor1_Y_final[i]=predicted-val+highroom-1;

  1208.                 }

  1209.             } else {

  1210.                 if (val & 1) {

  1211.                     floor1_Y_final[i]=predicted-(val+1)/2;

  1212.                 } else {

  1213.                     floor1_Y_final[i]=predicted+val/2;

  1214.                 }

  1215.             }

  1216.         } else {

  1217.             floor1_flag[i]=0;

  1218.             floor1_Y_final[i]=predicted;

  1219.         }

  1220. 

  1221.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);

  1222.     }

  1223. 

  1224. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1225. 

  1226.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1227. 

  1228.     AV_DEBUG(" Floor decoded\n");

  1229. 

  1230.     return 0;

  1231. }

  1232. 

  1233. // Read and decode residue

  1234. 

  1235. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc, vorbis_residue *vr, uint_fast8_t ch, uint_fast8_t *do_not_decode, float *vec, uint_fast16_t vlen, int vr_type) {

  1236.     GetBitContext *gb=&vc->gb;

  1237.     uint_fast8_t c_p_c=vc->codebooks[vr->classbook].dimensions;

  1238.     uint_fast16_t n_to_read=vr->end-vr->begin;

  1239.     uint_fast16_t ptns_to_read=n_to_read/vr->partition_size;

  1240.     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];

  1241.     uint_fast8_t pass;

  1242.     uint_fast8_t ch_used;

  1243.     uint_fast8_t i,j,l;

  1244.     uint_fast16_t k;

  1245. 

  1246.     if (vr_type==2) {

  1247.         for(j=1;j<ch;++j) {

  1248.                 do_not_decode[0]&=do_not_decode[j];  // FIXME - clobbering input

  1249.         }

  1250.         if (do_not_decode[0]) return 0;

  1251.         ch_used=1;

  1252.     } else {

  1253.         ch_used=ch;

  1254.     }

  1255. 

  1256.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1257. 

  1258.     for(pass=0;pass<=vr->maxpass;++pass) { // FIXME OPTIMIZE?

  1259.         uint_fast16_t voffset;

  1260.         uint_fast16_t partition_count;

  1261.         uint_fast16_t j_times_ptns_to_read;

  1262. 

  1263.         voffset=vr->begin;

  1264.         for(partition_count=0;partition_count<ptns_to_read;) {  // SPEC        error

  1265.             if (!pass) {

  1266.                 uint_fast32_t inverse_class = ff_inverse[vr->classifications];

  1267.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1268.                     if (!do_not_decode[j]) {

  1269.                         uint_fast32_t temp=get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1270.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1271. 

  1272.                         AV_DEBUG("Classword: %d \n", temp);

  1273. 

  1274.                         assert(vr->classifications > 1 && temp<=65536); //needed for inverse[]

  1275.                         for(i=0;i<c_p_c;++i) {

  1276.                             uint_fast32_t temp2;

  1277. 

  1278.                             temp2=(((uint_fast64_t)temp) * inverse_class)>>32;

  1279.                             if (partition_count+c_p_c-1-i < ptns_to_read) {

  1280.                                 classifs[j_times_ptns_to_read+partition_count+c_p_c-1-i]=temp-temp2*vr->classifications;

  1281.                             }

  1282.                             temp=temp2;

  1283.                         }

  1284.                     }

  1285.                     j_times_ptns_to_read+=ptns_to_read;

  1286.                 }

  1287.             }

  1288.             for(i=0;(i<c_p_c) && (partition_count<ptns_to_read);++i) {

  1289.                 for(j_times_ptns_to_read=0, j=0;j<ch_used;++j) {

  1290.                     uint_fast16_t voffs;

  1291. 

  1292.                     if (!do_not_decode[j]) {

  1293.                         uint_fast8_t vqclass=classifs[j_times_ptns_to_read+partition_count];

  1294.                         int_fast16_t vqbook=vr->books[vqclass][pass];

  1295. 

  1296.                         if (vqbook>=0 && vc->codebooks[vqbook].codevectors) {

  1297.                             uint_fast16_t coffs;

  1298.                             unsigned dim= vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64

  1299.                             uint_fast16_t step= dim==1 ? vr->partition_size

  1300.                                               : FASTDIV(vr->partition_size, dim);

  1301.                             vorbis_codebook codebook= vc->codebooks[vqbook];

  1302. 

  1303.                             if (vr_type==0) {

  1304. 

  1305.                                 voffs=voffset+j*vlen;

  1306.                                 for(k=0;k<step;++k) {

  1307.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1308.                                     for(l=0;l<dim;++l) {

  1309.                                         vec[voffs+k+l*step]+=codebook.codevectors[coffs+l];  // FPMATH

  1310.                                     }

  1311.                                 }

  1312.                             }

  1313.                             else if (vr_type==1) {

  1314.                                 voffs=voffset+j*vlen;

  1315.                                 for(k=0;k<step;++k) {

  1316.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1317.                                     for(l=0;l<dim;++l, ++voffs) {

  1318.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1319. 

  1320.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1321.                                     }

  1322.                                 }

  1323.                             }

  1324.                             else if (vr_type==2 && ch==2 && (voffset&1)==0 && (dim&1)==0) { // most frequent case optimized

  1325.                                 voffs=voffset>>1;

  1326. 

  1327.                                 if(dim==2) {

  1328.                                     for(k=0;k<step;++k) {

  1329.                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1330.                                         vec[voffs+k     ]+=codebook.codevectors[coffs  ];  // FPMATH

  1331.                                         vec[voffs+k+vlen]+=codebook.codevectors[coffs+1];  // FPMATH

  1332.                                     }

  1333.                                 } else if(dim==4) {

  1334.                                     for(k=0;k<step;++k, voffs+=2) {

  1335.                                         coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1336.                                         vec[voffs       ]+=codebook.codevectors[coffs  ];  // FPMATH

  1337.                                         vec[voffs+1     ]+=codebook.codevectors[coffs+2];  // FPMATH

  1338.                                         vec[voffs+vlen  ]+=codebook.codevectors[coffs+1];  // FPMATH

  1339.                                         vec[voffs+vlen+1]+=codebook.codevectors[coffs+3];  // FPMATH

  1340.                                     }

  1341.                                 } else

  1342.                                 for(k=0;k<step;++k) {

  1343.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1344.                                     for(l=0;l<dim;l+=2, voffs++) {

  1345.                                         vec[voffs     ]+=codebook.codevectors[coffs+l  ];  // FPMATH

  1346.                                         vec[voffs+vlen]+=codebook.codevectors[coffs+l+1];  // FPMATH

  1347. 

  1348.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);

  1349.                                     }

  1350.                                 }

  1351. 

  1352.                             }

  1353.                             else if (vr_type==2) {

  1354.                                 voffs=voffset;

  1355. 

  1356.                                 for(k=0;k<step;++k) {

  1357.                                     coffs=get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1358.                                     for(l=0;l<dim;++l, ++voffs) {

  1359.                                         vec[voffs/ch+(voffs%ch)*vlen]+=codebook.codevectors[coffs+l];  // FPMATH FIXME use if and counter instead of / and %

  1360. 

  1361.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset/ch+(voffs%ch)*vlen, vec[voffset/ch+(voffs%ch)*vlen], codebook.codevectors[coffs+l], coffs, l);

  1362.                                     }

  1363.                                 }

  1364.                             }

  1365.                         }

  1366.                     }

  1367.                     j_times_ptns_to_read+=ptns_to_read;

  1368.                 }

  1369.                 ++partition_count;

  1370.                 voffset+=vr->partition_size;

  1371.             }

  1372.         }

  1373.     }

  1374.     return 0;

  1375. }

  1376. 

  1377. static inline 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)

  1378. {

  1379.     if (vr->type==2)

  1380.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1381.     else if (vr->type==1)

  1382.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1383.     else if (vr->type==0)

  1384.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1385.     else {

  1386.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1387.         return 1;

  1388.     }

  1389. }

  1390. 

  1391. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1392. {

  1393.     int i;

  1394.     for(i=0; i<blocksize; i++)

  1395.     {

  1396.         if (mag[i]>0.0) {

  1397.             if (ang[i]>0.0) {

  1398.                 ang[i]=mag[i]-ang[i];

  1399.             } else {

  1400.                 float temp=ang[i];

  1401.                 ang[i]=mag[i];

  1402.                 mag[i]+=temp;

  1403.             }

  1404.         } else {

  1405.             if (ang[i]>0.0) {

  1406.                 ang[i]+=mag[i];

  1407.             } else {

  1408.                 float temp=ang[i];

  1409.                 ang[i]=mag[i];

  1410.                 mag[i]-=temp;

  1411.             }

  1412.         }

  1413.     }

  1414. }

  1415. 

  1416. static void copy_normalize(float *dst, float *src, int len, int exp_bias, float add_bias)

  1417. {

  1418.     int i;

  1419.     if(exp_bias) {

  1420.         memcpy(dst, src, len * sizeof(float));

  1421.     } else {

  1422.         for(i=0; i<len; i++)

  1423.             dst[i] = src[i] + add_bias;

  1424.     }

  1425. }

  1426. 

  1427. // Decode the audio packet using the functions above

  1428. 

  1429. static int vorbis_parse_audio_packet(vorbis_context *vc) {

  1430.     GetBitContext *gb=&vc->gb;

  1431. 

  1432.     uint_fast8_t previous_window=vc->previous_window;

  1433.     uint_fast8_t mode_number;

  1434.     uint_fast8_t blockflag;

  1435.     uint_fast16_t blocksize;

  1436.     int_fast32_t i,j;

  1437.     uint_fast8_t no_residue[vc->audio_channels];

  1438.     uint_fast8_t do_not_decode[vc->audio_channels];

  1439.     vorbis_mapping *mapping;

  1440.     float *ch_res_ptr=vc->channel_residues;

  1441.     float *ch_floor_ptr=vc->channel_floors;

  1442.     uint_fast8_t res_chan[vc->audio_channels];

  1443.     uint_fast8_t res_num=0;

  1444.     int_fast16_t retlen=0;

  1445.     float fadd_bias = vc->add_bias;

  1446. 

  1447.     if (get_bits1(gb)) {

  1448.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1449.         return -1; // packet type not audio

  1450.     }

  1451. 

  1452.     if (vc->mode_count==1) {

  1453.         mode_number=0;

  1454.     } else {

  1455.         mode_number=get_bits(gb, ilog(vc->mode_count-1));

  1456.     }

  1457.     if (mode_number>=vc->mode_count) {

  1458.         av_log(vc->avccontext, AV_LOG_ERROR, "mode number %d out of range.\n", mode_number);

  1459.         return -1;

  1460.     }

  1461.     vc->mode_number=mode_number;

  1462.     mapping=&vc->mappings[vc->modes[mode_number].mapping];

  1463. 

  1464.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1465. 

  1466.     blockflag=vc->modes[mode_number].blockflag;

  1467.     blocksize=vc->blocksize[blockflag];

  1468.     if (blockflag) {

  1469.         skip_bits(gb, 2); // previous_window, next_window

  1470.     }

  1471. 

  1472.     memset(ch_res_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1473.     memset(ch_floor_ptr, 0, sizeof(float)*vc->audio_channels*blocksize/2); //FIXME can this be removed ?

  1474. 

  1475. // Decode floor

  1476. 

  1477.     for(i=0;i<vc->audio_channels;++i) {

  1478.         vorbis_floor *floor;

  1479.         if (mapping->submaps>1) {

  1480.             floor=&vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1481.         } else {

  1482.             floor=&vc->floors[mapping->submap_floor[0]];

  1483.         }

  1484. 

  1485.         no_residue[i]=floor->decode(vc, &floor->data, ch_floor_ptr);

  1486.         ch_floor_ptr+=blocksize/2;

  1487.     }

  1488. 

  1489. // Nonzero vector propagate

  1490. 

  1491.     for(i=mapping->coupling_steps-1;i>=0;--i) {

  1492.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1493.             no_residue[mapping->magnitude[i]]=0;

  1494.             no_residue[mapping->angle[i]]=0;

  1495.         }

  1496.     }

  1497. 

  1498. // Decode residue

  1499. 

  1500.     for(i=0;i<mapping->submaps;++i) {

  1501.         vorbis_residue *residue;

  1502.         uint_fast8_t ch=0;

  1503. 

  1504.         for(j=0;j<vc->audio_channels;++j) {

  1505.             if ((mapping->submaps==1) || (i==mapping->mux[j])) {

  1506.                 res_chan[j]=res_num;

  1507.                 if (no_residue[j]) {

  1508.                     do_not_decode[ch]=1;

  1509.                 } else {

  1510.                     do_not_decode[ch]=0;

  1511.                 }

  1512.                 ++ch;

  1513.                 ++res_num;

  1514.             }

  1515.         }

  1516.         residue=&vc->residues[mapping->submap_residue[i]];

  1517.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1518. 

  1519.         ch_res_ptr+=ch*blocksize/2;

  1520.     }

  1521. 

  1522. // Inverse coupling

  1523. 

  1524.     for(i=mapping->coupling_steps-1;i>=0;--i) { //warning: i has to be signed

  1525.         float *mag, *ang;

  1526. 

  1527.         mag=vc->channel_residues+res_chan[mapping->magnitude[i]]*blocksize/2;

  1528.         ang=vc->channel_residues+res_chan[mapping->angle[i]]*blocksize/2;

  1529.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize/2);

  1530.     }

  1531. 

  1532. // Dotproduct, MDCT

  1533. 

  1534.     for(j=vc->audio_channels-1;j>=0;j--) {

  1535.         ch_floor_ptr=vc->channel_floors+j*blocksize/2;

  1536.         ch_res_ptr=vc->channel_residues+res_chan[j]*blocksize/2;

  1537.         vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize/2);

  1538.         ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);

  1539.     }

  1540. 

  1541. // Overlap/add, save data for next overlapping  FPMATH

  1542. 

  1543.     retlen = (blocksize + vc->blocksize[previous_window])/4;

  1544.     for(j=0;j<vc->audio_channels;j++) {

  1545.         uint_fast16_t bs0=vc->blocksize[0];

  1546.         uint_fast16_t bs1=vc->blocksize[1];

  1547.         float *residue=vc->channel_residues+res_chan[j]*blocksize/2;

  1548.         float *saved=vc->saved+j*bs1/4;

  1549.         float *ret=vc->channel_floors+j*retlen;

  1550.         float *buf=residue;

  1551.         const float *win=vc->win[blockflag&previous_window];

  1552. 

  1553.         if(blockflag == previous_window) {

  1554.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize/4);

  1555.         } else if(blockflag > previous_window) {

  1556.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0/4);

  1557.             copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);

  1558.         } else {

  1559.             copy_normalize(ret, saved, (bs1-bs0)/4, vc->exp_bias, fadd_bias);

  1560.             vc->dsp.vector_fmul_window(ret+(bs1-bs0)/4, saved+(bs1-bs0)/4, buf, win, fadd_bias, bs0/4);

  1561.         }

  1562.         memcpy(saved, buf+blocksize/4, blocksize/4*sizeof(float));

  1563.     }

  1564. 

  1565.     vc->previous_window = blockflag;

  1566.     return retlen;

  1567. }

  1568. 

  1569. // Return the decoded audio packet through the standard api

  1570. 

  1571. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1572.                         void *data, int *data_size,

  1573.                         AVPacket *avpkt)

  1574. {

  1575.     const uint8_t *buf = avpkt->data;

  1576.     int buf_size = avpkt->size;

  1577.     vorbis_context *vc = avccontext->priv_data ;

  1578.     GetBitContext *gb = &(vc->gb);

  1579.     const float *channel_ptrs[vc->audio_channels];

  1580.     int i;

  1581. 

  1582.     int_fast16_t len;

  1583. 

  1584.     if(!buf_size){

  1585.         return 0;

  1586.     }

  1587. 

  1588.     AV_DEBUG("packet length %d \n", buf_size);

  1589. 

  1590.     init_get_bits(gb, buf, buf_size*8);

  1591. 

  1592.     len=vorbis_parse_audio_packet(vc);

  1593. 

  1594.     if (len<=0) {

  1595.         *data_size=0;

  1596.         return buf_size;

  1597.     }

  1598. 

  1599.     if (!vc->first_frame) {

  1600.         vc->first_frame=1;

  1601.         *data_size=0;

  1602.         return buf_size ;

  1603.     }

  1604. 

  1605.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1606. 

  1607.     for(i=0; i<vc->audio_channels; i++)

  1608.         channel_ptrs[i] = vc->channel_floors+i*len;

  1609.     vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);

  1610.     *data_size=len*2*vc->audio_channels;

  1611. 

  1612.     return buf_size ;

  1613. }

  1614. 

  1615. // Close decoder

  1616. 

  1617. static av_cold int vorbis_decode_close(AVCodecContext *avccontext) {

  1618.     vorbis_context *vc = avccontext->priv_data;

  1619. 

  1620.     vorbis_free(vc);

  1621. 

  1622.     return 0 ;

  1623. }

  1624. 

  1625. AVCodec vorbis_decoder = {

  1626.     "vorbis",

  1627.     CODEC_TYPE_AUDIO,

  1628.     CODEC_ID_VORBIS,

  1629.     sizeof(vorbis_context),

  1630.     vorbis_decode_init,

  1631.     NULL,

  1632.     vorbis_decode_close,

  1633.     vorbis_decode_frame,

  1634.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1635. };