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FFmpeg/libavcodec/vorbis_dec.c

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  1. /**

  2.  * @file

  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. #include "fft.h"

  34. 

  35. #include "vorbis.h"

  36. #include "xiph.h"

  37. 

  38. #define V_NB_BITS 8

  39. #define V_NB_BITS2 11

  40. #define V_MAX_VLCS (1 << 16)

  41. #define V_MAX_PARTITIONS (1 << 20)

  42. 

  43. #ifndef V_DEBUG

  44. #define AV_DEBUG(...)

  45. #endif

  46. 

  47. #undef NDEBUG

  48. #include <assert.h>

  49. 

  50. typedef struct {

  51.     uint_fast8_t dimensions;

  52.     uint_fast8_t lookup_type;

  53.     uint_fast8_t maxdepth;

  54.     VLC vlc;

  55.     float *codevectors;

  56.     unsigned int nb_bits;

  57. } vorbis_codebook;

  58. 

  59. typedef union  vorbis_floor_u  vorbis_floor_data;

  60. typedef struct vorbis_floor0_s vorbis_floor0;

  61. typedef struct vorbis_floor1_s vorbis_floor1;

  62. struct vorbis_context_s;

  63. typedef

  64. uint_fast8_t (* vorbis_floor_decode_func)

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

  66. typedef struct {

  67.     uint_fast8_t floor_type;

  68.     vorbis_floor_decode_func decode;

  69.     union vorbis_floor_u {

  70.         struct vorbis_floor0_s {

  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.             uint_fast8_t partitions;

  84.             uint_fast8_t maximum_class;

  85.             uint_fast8_t partition_class[32];

  86.             uint_fast8_t class_dimensions[16];

  87.             uint_fast8_t class_subclasses[16];

  88.             uint_fast8_t class_masterbook[16];

  89.             int_fast16_t subclass_books[16][8];

  90.             uint_fast8_t multiplier;

  91.             uint_fast16_t x_list_dim;

  92.             vorbis_floor1_entry *list;

  93.         } t1;

  94.     } data;

  95. } vorbis_floor;

  96. 

  97. typedef struct {

  98.     uint_fast16_t type;

  99.     uint_fast32_t begin;

  100.     uint_fast32_t end;

  101.     uint_fast32_t partition_size;

  102.     uint_fast8_t  classifications;

  103.     uint_fast8_t  classbook;

  104.     int_fast16_t  books[64][8];

  105.     uint_fast8_t  maxpass;

  106. } vorbis_residue;

  107. 

  108. typedef struct {

  109.     uint_fast8_t  submaps;

  110.     uint_fast16_t coupling_steps;

  111.     uint_fast8_t *magnitude;

  112.     uint_fast8_t *angle;

  113.     uint_fast8_t *mux;

  114.     uint_fast8_t  submap_floor[16];

  115.     uint_fast8_t  submap_residue[16];

  116. } vorbis_mapping;

  117. 

  118. typedef struct {

  119.     uint_fast8_t  blockflag;

  120.     uint_fast16_t windowtype;

  121.     uint_fast16_t transformtype;

  122.     uint_fast8_t  mapping;

  123. } vorbis_mode;

  124. 

  125. typedef struct vorbis_context_s {

  126.     AVCodecContext *avccontext;

  127.     GetBitContext gb;

  128.     DSPContext dsp;

  129. 

  130.     FFTContext mdct[2];

  131.     uint_fast8_t  first_frame;

  132.     uint_fast32_t version;

  133.     uint_fast8_t  audio_channels;

  134.     uint_fast32_t audio_samplerate;

  135.     uint_fast32_t bitrate_maximum;

  136.     uint_fast32_t bitrate_nominal;

  137.     uint_fast32_t bitrate_minimum;

  138.     uint_fast32_t blocksize[2];

  139.     const float  *win[2];

  140.     uint_fast16_t codebook_count;

  141.     vorbis_codebook *codebooks;

  142.     uint_fast8_t  floor_count;

  143.     vorbis_floor *floors;

  144.     uint_fast8_t  residue_count;

  145.     vorbis_residue *residues;

  146.     uint_fast8_t  mapping_count;

  147.     vorbis_mapping *mappings;

  148.     uint_fast8_t  mode_count;

  149.     vorbis_mode  *modes;

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

  151.     uint_fast8_t  previous_window;

  152.     float        *channel_residues;

  153.     float        *channel_floors;

  154.     float        *saved;

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

  156.     uint_fast32_t exp_bias;

  157. } vorbis_context;

  158. 

  159. /* Helper functions */

  160. 

  161. #define BARK(x) \

  162.     (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))

  163. 

  164. static const char idx_err_str[] = "Index value %d out of range (0 - %d) for %s at %s:%i\n";

  165. #define VALIDATE_INDEX(idx, limit) \

  166.     if (idx >= limit) {\

  167.         av_log(vc->avccontext, AV_LOG_ERROR,\

  168.                idx_err_str,\

  169.                (int)(idx), (int)(limit - 1), #idx, __FILE__, __LINE__);\

  170.         return -1;\

  171.     }

  172. #define GET_VALIDATED_INDEX(idx, bits, limit) \

  173.     {\

  174.         idx = get_bits(gb, bits);\

  175.         VALIDATE_INDEX(idx, limit)\

  176.     }

  177. 

  178. static float vorbisfloat2float(uint_fast32_t val)

  179. {

  180.     double mant = val & 0x1fffff;

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

  182.     if (val & 0x80000000)

  183.         mant = -mant;

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

  185. }

  186. 

  187. 

  188. // Free all allocated memory -----------------------------------------

  189. 

  190. static void vorbis_free(vorbis_context *vc)

  191. {

  192.     int_fast16_t i;

  193. 

  194.     av_freep(&vc->channel_residues);

  195.     av_freep(&vc->channel_floors);

  196.     av_freep(&vc->saved);

  197. 

  198.     av_freep(&vc->residues);

  199.     av_freep(&vc->modes);

  200. 

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

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

  203. 

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

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

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

  207.     }

  208.     av_freep(&vc->codebooks);

  209. 

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

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

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

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

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

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

  216.         } else {

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

  218.         }

  219.     }

  220.     av_freep(&vc->floors);

  221. 

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

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

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

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

  226.     }

  227.     av_freep(&vc->mappings);

  228. }

  229. 

  230. // Parse setup header -------------------------------------------------

  231. 

  232. // Process codebooks part

  233. 

  234. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  235. {

  236.     uint_fast16_t cb;

  237.     uint8_t  *tmp_vlc_bits;

  238.     uint32_t *tmp_vlc_codes;

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

  240. 

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

  242. 

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

  244. 

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

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

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

  248. 

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

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

  251.         uint_fast8_t ordered;

  252.         uint_fast32_t t, used_entries = 0;

  253.         uint_fast32_t entries;

  254. 

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

  256. 

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

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

  259.             goto error;

  260.         }

  261. 

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

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

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

  265.             goto error;

  266.         }

  267.         entries = get_bits(gb, 24);

  268.         if (entries > V_MAX_VLCS) {

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

  270.             goto error;

  271.         }

  272. 

  273.         ordered = get_bits1(gb);

  274. 

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

  276. 

  277.         if (!ordered) {

  278.             uint_fast16_t ce;

  279.             uint_fast8_t  flag;

  280.             uint_fast8_t  sparse = get_bits1(gb);

  281. 

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

  283. 

  284.             if (sparse) {

  285.                 AV_DEBUG(" sparse \n");

  286. 

  287.                 used_entries = 0;

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

  289.                     flag = get_bits1(gb);

  290.                     if (flag) {

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

  292.                         ++used_entries;

  293.                     } else

  294.                         tmp_vlc_bits[ce] = 0;

  295.                 }

  296.             } else {

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

  298. 

  299.                 used_entries = entries;

  300.                 for (ce = 0; ce < entries; ++ce)

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

  302.             }

  303.         } else {

  304.             uint_fast16_t current_entry = 0;

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

  306. 

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

  308. 

  309.             used_entries = entries;

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

  311.                 uint_fast16_t i, number;

  312. 

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

  314. 

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

  316. 

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

  318. 

  319.                 for (i = current_entry; i < number+current_entry; ++i)

  320.                     if (i < used_entries)

  321.                         tmp_vlc_bits[i] = current_length;

  322. 

  323.                 current_entry+=number;

  324.             }

  325.             if (current_entry>used_entries) {

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

  327.                 goto error;

  328.             }

  329.         }

  330. 

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

  332. 

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

  334. 

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

  336. 

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

  338.             uint_fast16_t i, j, k;

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

  340.             uint_fast16_t codebook_multiplicands[codebook_lookup_values];

  341. 

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

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

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

  345.             uint_fast8_t codebook_sequence_p = get_bits1(gb);

  346. 

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

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

  349. 

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

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

  352. 

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

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

  355.             }

  356. 

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

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

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

  360.                 uint_fast8_t dim = codebook_setup->dimensions;

  361. 

  362.                 if (tmp_vlc_bits[i]) {

  363.                     float last = 0.0;

  364.                     uint_fast32_t lookup_offset = i;

  365. 

  366. #ifdef V_DEBUG

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

  368. #endif

  369. 

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

  371.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  373.                         if (codebook_sequence_p)

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

  375.                         lookup_offset/=codebook_lookup_values;

  376.                     }

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

  378. 

  379. #ifdef V_DEBUG

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

  381.                     for (k = 0; k < dim; ++k)

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

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

  384. #endif

  385. 

  386.                     ++j;

  387.                 }

  388.             }

  389.             if (j != used_entries) {

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

  391.                 goto error;

  392.             }

  393.             entries = used_entries;

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

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

  396.             goto error;

  397.         }

  398. 

  399. // Initialize VLC table

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

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

  402.             goto error;

  403.         }

  404.         codebook_setup->maxdepth = 0;

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

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

  407.                 codebook_setup->maxdepth = tmp_vlc_bits[t];

  408. 

  409.         if (codebook_setup->maxdepth > 3 * V_NB_BITS)

  410.             codebook_setup->nb_bits = V_NB_BITS2;

  411.         else

  412.             codebook_setup->nb_bits = V_NB_BITS;

  413. 

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

  415. 

  416.         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)) {

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

  418.             goto error;

  419.         }

  420.     }

  421. 

  422.     av_free(tmp_vlc_bits);

  423.     av_free(tmp_vlc_codes);

  424.     return 0;

  425. 

  426. // Error:

  427. error:

  428.     av_free(tmp_vlc_bits);

  429.     av_free(tmp_vlc_codes);

  430.     return -1;

  431. }

  432. 

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

  434. 

  435. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  436. {

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

  438.     uint_fast8_t i;

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

  440. 

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

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

  443. 

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

  445. 

  446.         if (vorbis_tdtransform) {

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

  448.             return -1;

  449.         }

  450.     }

  451.     return 0;

  452. }

  453. 

  454. // Process floors part

  455. 

  456. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  457.                                          vorbis_floor_data *vfu, float *vec);

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

  459. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  460.                                          vorbis_floor_data *vfu, float *vec);

  461. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  462. {

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

  464.     uint_fast16_t i,j,k;

  465. 

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

  467. 

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

  469. 

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

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

  472. 

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

  474. 

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

  476. 

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

  478.             uint_fast8_t  maximum_class = 0;

  479.             uint_fast8_t  rangebits;

  480.             uint_fast16_t floor1_values = 2;

  481. 

  482.             floor_setup->decode = vorbis_floor1_decode;

  483. 

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

  485. 

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

  487. 

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

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

  490.                 if (floor_setup->data.t1.partition_class[j] > maximum_class)

  491.                     maximum_class = floor_setup->data.t1.partition_class[j];

  492. 

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

  494. 

  495.             }

  496. 

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

  498. 

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

  500. 

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

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

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

  504. 

  505.                 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]);

  506. 

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

  508.                     GET_VALIDATED_INDEX(floor_setup->data.t1.class_masterbook[j], 8, vc->codebook_count)

  509. 

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

  511.                 }

  512. 

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

  514.                     int16_t bits = get_bits(gb, 8) - 1;

  515.                     if (bits != -1)

  516.                         VALIDATE_INDEX(bits, vc->codebook_count)

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

  518. 

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

  520.                 }

  521.             }

  522. 

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

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

  525. 

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

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

  528. 

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

  530. 

  531. 

  532.             rangebits = get_bits(gb, 4);

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

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

  535. 

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

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

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

  539. 

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

  541.                 }

  542.             }

  543. 

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

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

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

  547.             uint_fast8_t max_codebook_dim = 0;

  548. 

  549.             floor_setup->decode = vorbis_floor0_decode;

  550. 

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

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

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

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

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

  556.              * 2^0 - 1 == 0                             */

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

  558.               av_log(vc->avccontext, AV_LOG_ERROR,

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

  560.               return -1;

  561.             }

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

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

  564. 

  565.             /* allocate mem for booklist */

  566.             floor_setup->data.t0.book_list =

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

  568.             if (!floor_setup->data.t0.book_list)

  569.                 return -1;

  570.             /* read book indexes */

  571.             {

  572.                 int idx;

  573.                 uint_fast8_t book_idx;

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

  575.                     GET_VALIDATED_INDEX(floor_setup->data.t0.book_list[idx], 8, vc->codebook_count)

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

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

  578.                 }

  579.             }

  580. 

  581.             create_map(vc, i);

  582. 

  583.             /* allocate mem for lsp coefficients */

  584.             {

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

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

  587.                 floor_setup->data.t0.lsp =

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

  589.                               * sizeof(float));

  590.                 if (!floor_setup->data.t0.lsp)

  591.                     return -1;

  592.             }

  593. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  607.             {

  608.               int idx;

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

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

  611.                            idx+1,

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

  613.               }

  614.             }

  615. #endif

  616.         } else {

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

  618.             return -1;

  619.         }

  620.     }

  621.     return 0;

  622. }

  623. 

  624. // Process residues part

  625. 

  626. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  627. {

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

  629.     uint_fast8_t i, j, k;

  630. 

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

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

  633. 

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

  635. 

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

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

  638.         uint_fast8_t cascade[64];

  639.         uint_fast8_t high_bits;

  640.         uint_fast8_t low_bits;

  641. 

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

  643. 

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

  645. 

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

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

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

  649.         /* Validations to prevent a buffer overflow later. */

  650.         if (res_setup->begin>res_setup->end ||

  651.             res_setup->end>vc->blocksize[1] / (res_setup->type == 2 ? 1 : 2) ||

  652.             (res_setup->end-res_setup->begin) / res_setup->partition_size > V_MAX_PARTITIONS) {

  653.             av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %"PRIdFAST16", %"PRIdFAST32", %"PRIdFAST32", %"PRIdFAST32", %"PRIdFAST32"\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1] / 2);

  654.             return -1;

  655.         }

  656. 

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

  658.         GET_VALIDATED_INDEX(res_setup->classbook, 8, vc->codebook_count)

  659. 

  660.         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,

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

  662. 

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

  664.             high_bits = 0;

  665.             low_bits  = get_bits(gb, 3);

  666.             if (get_bits1(gb))

  667.                 high_bits = get_bits(gb, 5);

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

  669. 

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

  671.         }

  672. 

  673.         res_setup->maxpass = 0;

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

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

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

  677.                     GET_VALIDATED_INDEX(res_setup->books[j][k], 8, vc->codebook_count)

  678. 

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

  680. 

  681.                     if (k>res_setup->maxpass)

  682.                         res_setup->maxpass = k;

  683.                 } else {

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

  685.                 }

  686.             }

  687.         }

  688.     }

  689.     return 0;

  690. }

  691. 

  692. // Process mappings part

  693. 

  694. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  695. {

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

  697.     uint_fast8_t i, j;

  698. 

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

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

  701. 

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

  703. 

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

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

  706. 

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

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

  709.             return -1;

  710.         }

  711.         if (get_bits1(gb)) {

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

  713.         } else {

  714.             mapping_setup->submaps = 1;

  715.         }

  716. 

  717.         if (get_bits1(gb)) {

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

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

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

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

  722.                 GET_VALIDATED_INDEX(mapping_setup->magnitude[j], ilog(vc->audio_channels - 1), vc->audio_channels)

  723.                 GET_VALIDATED_INDEX(mapping_setup->angle[j],     ilog(vc->audio_channels - 1), vc->audio_channels)

  724.             }

  725.         } else {

  726.             mapping_setup->coupling_steps = 0;

  727.         }

  728. 

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

  730. 

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

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

  733.             return -1; // following spec.

  734.         }

  735. 

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

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

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

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

  740.         }

  741. 

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

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

  744.             GET_VALIDATED_INDEX(mapping_setup->submap_floor[j],   8, vc->floor_count)

  745.             GET_VALIDATED_INDEX(mapping_setup->submap_residue[j], 8, vc->residue_count)

  746. 

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

  748.         }

  749.     }

  750.     return 0;

  751. }

  752. 

  753. // Process modes part

  754. 

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

  756. {

  757.     vorbis_floor *floors = vc->floors;

  758.     vorbis_floor0 *vf;

  759.     int idx;

  760.     int_fast8_t blockflag;

  761.     int_fast32_t *map;

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

  763. 

  764.     for (blockflag = 0; blockflag < 2; ++blockflag) {

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

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

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

  768. 

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

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

  771. 

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

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

  774.                              ((vf->bark_map_size) /

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

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

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

  778.         }

  779.         map[n] = -1;

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

  781.     }

  782. 

  783. #   ifdef V_DEBUG

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

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

  786.                  idx, map[idx]);

  787.     }

  788. #   endif

  789. }

  790. 

  791. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  792. {

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

  794.     uint_fast8_t i;

  795. 

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

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

  798. 

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

  800. 

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

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

  803. 

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

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

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

  807.         GET_VALIDATED_INDEX(mode_setup->mapping, 8, vc->mapping_count);

  808. 

  809.         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);

  810.     }

  811.     return 0;

  812. }

  813. 

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

  815. 

  816. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  817. {

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

  819. 

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

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

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

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

  824.         return -1;

  825.     }

  826. 

  827.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  829.         return -2;

  830.     }

  831.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  833.         return -3;

  834.     }

  835.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  837.         return -4;

  838.     }

  839.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  841.         return -5;

  842.     }

  843.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  845.         return -6;

  846.     }

  847.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  849.         return -7;

  850.     }

  851.     if (!get_bits1(gb)) {

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

  853.         return -8; // framing flag bit unset error

  854.     }

  855. 

  856.     return 0;

  857. }

  858. 

  859. // Process the identification header

  860. 

  861. static int vorbis_parse_id_hdr(vorbis_context *vc)

  862. {

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

  864.     uint_fast8_t bl0, bl1;

  865. 

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

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

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

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

  870.         return -1;

  871.     }

  872. 

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

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

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

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

  877.         return -1;

  878.     }

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

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

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

  882.         return -1;

  883.     }

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

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

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

  887.     bl0 = get_bits(gb, 4);

  888.     bl1 = get_bits(gb, 4);

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

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

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

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

  893.         return -3;

  894.     }

  895.     // output format int16

  896.     if (vc->blocksize[1] / 2 * vc->audio_channels * 2 > AVCODEC_MAX_AUDIO_FRAME_SIZE) {

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

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

  899.         return -4;

  900.     }

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

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

  903. 

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

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

  906.         return -2;

  907.     }

  908. 

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

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

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

  912.     vc->previous_window  = 0;

  913. 

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

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

  916. 

  917.     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 ",

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

  919. 

  920. /*

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

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

  923.         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)));

  924.     }

  925. */

  926. 

  927.     return 0;

  928. }

  929. 

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

  931. 

  932. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  933. {

  934.     vorbis_context *vc = avccontext->priv_data ;

  935.     uint8_t *headers   = avccontext->extradata;

  936.     int headers_len    = avccontext->extradata_size;

  937.     uint8_t *header_start[3];

  938.     int header_len[3];

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

  940.     int hdr_type;

  941. 

  942.     vc->avccontext = avccontext;

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

  944. 

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

  946.         vc->add_bias = 385;

  947.         vc->exp_bias = 0;

  948.     } else {

  949.         vc->add_bias = 0;

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

  951.     }

  952. 

  953.     if (!headers_len) {

  954.         av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");

  955.         return -1;

  956.     }

  957. 

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

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

  960.         return -1;

  961.     }

  962. 

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

  964.     hdr_type = get_bits(gb, 8);

  965.     if (hdr_type != 1) {

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

  967.         return -1;

  968.     }

  969.     if (vorbis_parse_id_hdr(vc)) {

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

  971.         vorbis_free(vc);

  972.         return -1;

  973.     }

  974. 

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

  976.     hdr_type = get_bits(gb, 8);

  977.     if (hdr_type != 5) {

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

  979.         vorbis_free(vc);

  980.         return -1;

  981.     }

  982.     if (vorbis_parse_setup_hdr(vc)) {

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

  984.         vorbis_free(vc);

  985.         return -1;

  986.     }

  987. 

  988.     if (vc->audio_channels > 8)

  989.         avccontext->channel_layout = 0;

  990.     else

  991.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  992. 

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

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

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

  996.     avccontext->sample_fmt  = SAMPLE_FMT_S16;

  997. 

  998.     return 0 ;

  999. }

  1000. 

  1001. // Decode audiopackets -------------------------------------------------

  1002. 

  1003. // Read and decode floor

  1004. 

  1005. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  1006.                                          vorbis_floor_data *vfu, float *vec)

  1007. {

  1008.     vorbis_floor0 *vf = &vfu->t0;

  1009.     float *lsp = vf->lsp;

  1010.     uint_fast32_t amplitude;

  1011.     uint_fast32_t book_idx;

  1012.     uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;

  1013. 

  1014.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1015.     if (amplitude > 0) {

  1016.         float last = 0;

  1017.         uint_fast16_t lsp_len = 0;

  1018.         uint_fast16_t idx;

  1019.         vorbis_codebook codebook;

  1020. 

  1021.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1022.         if (book_idx >= vf->num_books) {

  1023.             av_log(vc->avccontext, AV_LOG_ERROR,

  1024.                     "floor0 dec: booknumber too high!\n");

  1025.             book_idx =  0;

  1026.             //FIXME: look above

  1027.         }

  1028.         AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);

  1029.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1030. 

  1031.         while (lsp_len<vf->order) {

  1032.             int vec_off;

  1033. 

  1034.             AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);

  1035.             AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1036.             /* read temp vector */

  1037.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1038.                                codebook.nb_bits, codebook.maxdepth)

  1039.                       * codebook.dimensions;

  1040.             AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);

  1041.             /* copy each vector component and add last to it */

  1042.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1043.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1044.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1045. 

  1046.             lsp_len += codebook.dimensions;

  1047.         }

  1048. #ifdef V_DEBUG

  1049.         /* DEBUG: output lsp coeffs */

  1050.         {

  1051.             int idx;

  1052.             for (idx = 0; idx < lsp_len; ++idx)

  1053.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1054.         }

  1055. #endif

  1056. 

  1057.         /* synthesize floor output vector */

  1058.         {

  1059.             int i;

  1060.             int order = vf->order;

  1061.             float wstep = M_PI / vf->bark_map_size;

  1062. 

  1063.             for (i = 0; i < order; i++)

  1064.                 lsp[i] = 2.0f * cos(lsp[i]);

  1065. 

  1066.             AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",

  1067.                      vf->map_size, order, wstep);

  1068. 

  1069.             i = 0;

  1070.             while (i < vf->map_size[blockflag]) {

  1071.                 int j, iter_cond = vf->map[blockflag][i];

  1072.                 float p = 0.5f;

  1073.                 float q = 0.5f;

  1074.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1075. 

  1076.                 /* similar part for the q and p products */

  1077.                 for (j = 0; j + 1 < order; j += 2) {

  1078.                     q *= lsp[j]     - two_cos_w;

  1079.                     p *= lsp[j + 1] - two_cos_w;

  1080.                 }

  1081.                 if (j == order) { // even order

  1082.                     p *= p * (2.0f - two_cos_w);

  1083.                     q *= q * (2.0f + two_cos_w);

  1084.                 } else { // odd order

  1085.                     q *= two_cos_w-lsp[j]; // one more time for q

  1086. 

  1087.                     /* final step and square */

  1088.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1089.                     q *= q;

  1090.                 }

  1091. 

  1092.                 /* calculate linear floor value */

  1093.                 {

  1094.                     q = exp((((amplitude*vf->amplitude_offset) /

  1095.                               (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1096.                              - vf->amplitude_offset) * .11512925f);

  1097.                 }

  1098. 

  1099.                 /* fill vector */

  1100.                 do {

  1101.                     vec[i] = q; ++i;

  1102.                 } while (vf->map[blockflag][i] == iter_cond);

  1103.             }

  1104.         }

  1105.     } else {

  1106.         /* this channel is unused */

  1107.         return 1;

  1108.     }

  1109. 

  1110.     AV_DEBUG(" Floor0 decoded\n");

  1111. 

  1112.     return 0;

  1113. }

  1114. 

  1115. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  1116.                                          vorbis_floor_data *vfu, float *vec)

  1117. {

  1118.     vorbis_floor1 *vf = &vfu->t1;

  1119.     GetBitContext *gb = &vc->gb;

  1120.     uint_fast16_t range_v[4] = { 256, 128, 86, 64 };

  1121.     uint_fast16_t range = range_v[vf->multiplier-1];

  1122.     uint_fast16_t floor1_Y[vf->x_list_dim];

  1123.     uint_fast16_t floor1_Y_final[vf->x_list_dim];

  1124.     int floor1_flag[vf->x_list_dim];

  1125.     uint_fast8_t class_;

  1126.     uint_fast8_t cdim;

  1127.     uint_fast8_t cbits;

  1128.     uint_fast8_t csub;

  1129.     uint_fast8_t cval;

  1130.     int_fast16_t book;

  1131.     uint_fast16_t offset;

  1132.     uint_fast16_t i,j;

  1133.     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx =  (unsigned)dy/adx ?

  1134.     int_fast16_t dy, err;

  1135. 

  1136. 

  1137.     if (!get_bits1(gb)) // silence

  1138.         return 1;

  1139. 

  1140. // Read values (or differences) for the floor's points

  1141. 

  1142.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1143.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1144. 

  1145.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1146. 

  1147.     offset = 2;

  1148.     for (i = 0; i < vf->partitions; ++i) {

  1149.         class_ = vf->partition_class[i];

  1150.         cdim   = vf->class_dimensions[class_];

  1151.         cbits  = vf->class_subclasses[class_];

  1152.         csub = (1 << cbits) - 1;

  1153.         cval = 0;

  1154. 

  1155.         AV_DEBUG("Cbits %d \n", cbits);

  1156. 

  1157.         if (cbits) // this reads all subclasses for this partition's class

  1158.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,

  1159.                             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);

  1160. 

  1161.         for (j = 0; j < cdim; ++j) {

  1162.             book = vf->subclass_books[class_][cval & csub];

  1163. 

  1164.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1165. 

  1166.             cval = cval >> cbits;

  1167.             if (book > -1) {

  1168.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1169.                 vc->codebooks[book].nb_bits, 3);

  1170.             } else {

  1171.                 floor1_Y[offset+j] = 0;

  1172.             }

  1173. 

  1174.             AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);

  1175.         }

  1176.         offset+=cdim;

  1177.     }

  1178. 

  1179. // Amplitude calculation from the differences

  1180. 

  1181.     floor1_flag[0] = 1;

  1182.     floor1_flag[1] = 1;

  1183.     floor1_Y_final[0] = floor1_Y[0];

  1184.     floor1_Y_final[1] = floor1_Y[1];

  1185. 

  1186.     for (i = 2; i < vf->x_list_dim; ++i) {

  1187.         uint_fast16_t val, highroom, lowroom, room;

  1188.         uint_fast16_t high_neigh_offs;

  1189.         uint_fast16_t low_neigh_offs;

  1190. 

  1191.         low_neigh_offs  = vf->list[i].low;

  1192.         high_neigh_offs = vf->list[i].high;

  1193.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1194.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1195.         ady = FFABS(dy);

  1196.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1197.         off = (int16_t)err / (int16_t)adx;

  1198.         if (dy < 0) {

  1199.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1200.         } else {

  1201.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1202.         } // render_point end

  1203. 

  1204.         val = floor1_Y[i];

  1205.         highroom = range-predicted;

  1206.         lowroom  = predicted;

  1207.         if (highroom < lowroom) {

  1208.             room = highroom * 2;

  1209.         } else {

  1210.             room = lowroom * 2;   // SPEC mispelling

  1211.         }

  1212.         if (val) {

  1213.             floor1_flag[low_neigh_offs]  = 1;

  1214.             floor1_flag[high_neigh_offs] = 1;

  1215.             floor1_flag[i]               = 1;

  1216.             if (val >= room) {

  1217.                 if (highroom > lowroom) {

  1218.                     floor1_Y_final[i] = val - lowroom + predicted;

  1219.                 } else {

  1220.                     floor1_Y_final[i] = predicted - val + highroom - 1;

  1221.                 }

  1222.             } else {

  1223.                 if (val & 1) {

  1224.                     floor1_Y_final[i] = predicted - (val + 1) / 2;

  1225.                 } else {

  1226.                     floor1_Y_final[i] = predicted + val / 2;

  1227.                 }

  1228.             }

  1229.         } else {

  1230.             floor1_flag[i]    = 0;

  1231.             floor1_Y_final[i] = predicted;

  1232.         }

  1233. 

  1234.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);

  1235.     }

  1236. 

  1237. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1238. 

  1239.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1240. 

  1241.     AV_DEBUG(" Floor decoded\n");

  1242. 

  1243.     return 0;

  1244. }

  1245. 

  1246. // Read and decode residue

  1247. 

  1248. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1249.                                                            vorbis_residue *vr,

  1250.                                                            uint_fast8_t ch,

  1251.                                                            uint_fast8_t *do_not_decode,

  1252.                                                            float *vec,

  1253.                                                            uint_fast16_t vlen,

  1254.                                                            int vr_type)

  1255. {

  1256.     GetBitContext *gb = &vc->gb;

  1257.     uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;

  1258.     uint_fast16_t n_to_read = vr->end-vr->begin;

  1259.     uint_fast16_t ptns_to_read = n_to_read/vr->partition_size;

  1260.     uint_fast8_t classifs[ptns_to_read*vc->audio_channels];

  1261.     uint_fast8_t pass;

  1262.     uint_fast8_t ch_used;

  1263.     uint_fast8_t i,j,l;

  1264.     uint_fast16_t k;

  1265. 

  1266.     if (vr_type == 2) {

  1267.         for (j = 1; j < ch; ++j)

  1268.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1269.         if (do_not_decode[0])

  1270.             return 0;

  1271.         ch_used = 1;

  1272.     } else {

  1273.         ch_used = ch;

  1274.     }

  1275. 

  1276.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1277. 

  1278.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1279.         uint_fast16_t voffset;

  1280.         uint_fast16_t partition_count;

  1281.         uint_fast16_t j_times_ptns_to_read;

  1282. 

  1283.         voffset = vr->begin;

  1284.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1285.             if (!pass) {

  1286.                 uint_fast32_t inverse_class = ff_inverse[vr->classifications];

  1287.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1288.                     if (!do_not_decode[j]) {

  1289.                         uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1290.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1291. 

  1292.                         AV_DEBUG("Classword: %d \n", temp);

  1293. 

  1294.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1295.                         for (i = 0; i < c_p_c; ++i) {

  1296.                             uint_fast32_t temp2;

  1297. 

  1298.                             temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;

  1299.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1300.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1301.                             temp = temp2;

  1302.                         }

  1303.                     }

  1304.                     j_times_ptns_to_read += ptns_to_read;

  1305.                 }

  1306.             }

  1307.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1308.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1309.                     uint_fast16_t voffs;

  1310. 

  1311.                     if (!do_not_decode[j]) {

  1312.                         uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];

  1313.                         int_fast16_t vqbook = vr->books[vqclass][pass];

  1314. 

  1315.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1316.                             uint_fast16_t coffs;

  1317.                             unsigned dim =  vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64

  1318.                             uint_fast16_t step = dim == 1 ? vr->partition_size

  1319.                                                           : FASTDIV(vr->partition_size, dim);

  1320.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1321. 

  1322.                             if (vr_type == 0) {

  1323. 

  1324.                                 voffs = voffset+j*vlen;

  1325.                                 for (k = 0; k < step; ++k) {

  1326.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1327.                                     for (l = 0; l < dim; ++l)

  1328.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH

  1329.                                 }

  1330.                             } else if (vr_type == 1) {

  1331.                                 voffs = voffset + j * vlen;

  1332.                                 for (k = 0; k < step; ++k) {

  1333.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1334.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1335.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1336. 

  1337.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1338.                                     }

  1339.                                 }

  1340.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1341.                                 voffs = voffset >> 1;

  1342. 

  1343.                                 if (dim == 2) {

  1344.                                     for (k = 0; k < step; ++k) {

  1345.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1346.                                         vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH

  1347.                                         vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH

  1348.                                     }

  1349.                                 } else if (dim == 4) {

  1350.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1351.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1352.                                         vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH

  1353.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH

  1354.                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH

  1355.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH

  1356.                                     }

  1357.                                 } else

  1358.                                 for (k = 0; k < step; ++k) {

  1359.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1360.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1361.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH

  1362.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH

  1363. 

  1364.                                         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);

  1365.                                     }

  1366.                                 }

  1367. 

  1368.                             } else if (vr_type == 2) {

  1369.                                 voffs = voffset;

  1370. 

  1371.                                 for (k = 0; k < step; ++k) {

  1372.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1373.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1374.                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %

  1375. 

  1376.                                         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);

  1377.                                     }

  1378.                                 }

  1379.                             }

  1380.                         }

  1381.                     }

  1382.                     j_times_ptns_to_read += ptns_to_read;

  1383.                 }

  1384.                 ++partition_count;

  1385.                 voffset += vr->partition_size;

  1386.             }

  1387.         }

  1388.     }

  1389.     return 0;

  1390. }

  1391. 

  1392. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1393.                                         uint_fast8_t ch,

  1394.                                         uint_fast8_t *do_not_decode,

  1395.                                         float *vec, uint_fast16_t vlen)

  1396. {

  1397.     if (vr->type == 2)

  1398.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1399.     else if (vr->type == 1)

  1400.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1401.     else if (vr->type == 0)

  1402.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1403.     else {

  1404.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1405.         return -1;

  1406.     }

  1407. }

  1408. 

  1409. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1410. {

  1411.     int i;

  1412.     for (i = 0;  i < blocksize;  i++) {

  1413.         if (mag[i] > 0.0) {

  1414.             if (ang[i] > 0.0) {

  1415.                 ang[i] = mag[i] - ang[i];

  1416.             } else {

  1417.                 float temp = ang[i];

  1418.                 ang[i]     = mag[i];

  1419.                 mag[i]    += temp;

  1420.             }

  1421.         } else {

  1422.             if (ang[i] > 0.0) {

  1423.                 ang[i] += mag[i];

  1424.             } else {

  1425.                 float temp = ang[i];

  1426.                 ang[i]     = mag[i];

  1427.                 mag[i]    -= temp;

  1428.             }

  1429.         }

  1430.     }

  1431. }

  1432. 

  1433. static void copy_normalize(float *dst, float *src, int len, int exp_bias,

  1434.                            float add_bias)

  1435. {

  1436.     int i;

  1437.     if (exp_bias) {

  1438.         memcpy(dst, src, len * sizeof(float));

  1439.     } else {

  1440.         for (i = 0; i < len; i++)

  1441.             dst[i] = src[i] + add_bias;

  1442.     }

  1443. }

  1444. 

  1445. // Decode the audio packet using the functions above

  1446. 

  1447. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1448. {

  1449.     GetBitContext *gb = &vc->gb;

  1450. 

  1451.     uint_fast8_t previous_window = vc->previous_window;

  1452.     uint_fast8_t mode_number;

  1453.     uint_fast8_t blockflag;

  1454.     uint_fast16_t blocksize;

  1455.     int_fast32_t i,j;

  1456.     uint_fast8_t no_residue[vc->audio_channels];

  1457.     uint_fast8_t do_not_decode[vc->audio_channels];

  1458.     vorbis_mapping *mapping;

  1459.     float *ch_res_ptr   = vc->channel_residues;

  1460.     float *ch_floor_ptr = vc->channel_floors;

  1461.     uint_fast8_t res_chan[vc->audio_channels];

  1462.     uint_fast8_t res_num = 0;

  1463.     int_fast16_t retlen  = 0;

  1464.     float fadd_bias = vc->add_bias;

  1465. 

  1466.     if (get_bits1(gb)) {

  1467.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1468.         return -1; // packet type not audio

  1469.     }

  1470. 

  1471.     if (vc->mode_count == 1) {

  1472.         mode_number = 0;

  1473.     } else {

  1474.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1475.     }

  1476.     vc->mode_number = mode_number;

  1477.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1478. 

  1479.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1480. 

  1481.     blockflag = vc->modes[mode_number].blockflag;

  1482.     blocksize = vc->blocksize[blockflag];

  1483.     if (blockflag)

  1484.         skip_bits(gb, 2); // previous_window, next_window

  1485. 

  1486.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1487.     memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1488. 

  1489. // Decode floor

  1490. 

  1491.     for (i = 0; i < vc->audio_channels; ++i) {

  1492.         vorbis_floor *floor;

  1493.         if (mapping->submaps > 1) {

  1494.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1495.         } else {

  1496.             floor = &vc->floors[mapping->submap_floor[0]];

  1497.         }

  1498. 

  1499.         no_residue[i] = floor->decode(vc, &floor->data, ch_floor_ptr);

  1500.         ch_floor_ptr += blocksize / 2;

  1501.     }

  1502. 

  1503. // Nonzero vector propagate

  1504. 

  1505.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1506.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1507.             no_residue[mapping->magnitude[i]] = 0;

  1508.             no_residue[mapping->angle[i]]     = 0;

  1509.         }

  1510.     }

  1511. 

  1512. // Decode residue

  1513. 

  1514.     for (i = 0; i < mapping->submaps; ++i) {

  1515.         vorbis_residue *residue;

  1516.         uint_fast8_t ch = 0;

  1517. 

  1518.         for (j = 0; j < vc->audio_channels; ++j) {

  1519.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1520.                 res_chan[j] = res_num;

  1521.                 if (no_residue[j]) {

  1522.                     do_not_decode[ch] = 1;

  1523.                 } else {

  1524.                     do_not_decode[ch] = 0;

  1525.                 }

  1526.                 ++ch;

  1527.                 ++res_num;

  1528.             }

  1529.         }

  1530.         residue = &vc->residues[mapping->submap_residue[i]];

  1531.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1532. 

  1533.         ch_res_ptr += ch * blocksize / 2;

  1534.     }

  1535. 

  1536. // Inverse coupling

  1537. 

  1538.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1539.         float *mag, *ang;

  1540. 

  1541.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

  1542.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1543.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1544.     }

  1545. 

  1546. // Dotproduct, MDCT

  1547. 

  1548.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1549.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;

  1550.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1551.         vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize / 2);

  1552.         ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);

  1553.     }

  1554. 

  1555. // Overlap/add, save data for next overlapping  FPMATH

  1556. 

  1557.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

  1558.     for (j = 0; j < vc->audio_channels; j++) {

  1559.         uint_fast16_t bs0 = vc->blocksize[0];

  1560.         uint_fast16_t bs1 = vc->blocksize[1];

  1561.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1562.         float *saved      = vc->saved + j * bs1 / 4;

  1563.         float *ret        = vc->channel_floors + j * retlen;

  1564.         float *buf        = residue;

  1565.         const float *win  = vc->win[blockflag & previous_window];

  1566. 

  1567.         if (blockflag == previous_window) {

  1568.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize / 4);

  1569.         } else if (blockflag > previous_window) {

  1570.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0 / 4);

  1571.             copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);

  1572.         } else {

  1573.             copy_normalize(ret, saved, (bs1 - bs0) / 4, vc->exp_bias, fadd_bias);

  1574.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, fadd_bias, bs0 / 4);

  1575.         }

  1576.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1577.     }

  1578. 

  1579.     vc->previous_window = blockflag;

  1580.     return retlen;

  1581. }

  1582. 

  1583. // Return the decoded audio packet through the standard api

  1584. 

  1585. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1586.                                void *data, int *data_size,

  1587.                                AVPacket *avpkt)

  1588. {

  1589.     const uint8_t *buf = avpkt->data;

  1590.     int buf_size       = avpkt->size;

  1591.     vorbis_context *vc = avccontext->priv_data ;

  1592.     GetBitContext *gb = &(vc->gb);

  1593.     const float *channel_ptrs[vc->audio_channels];

  1594.     int i;

  1595. 

  1596.     int_fast16_t len;

  1597. 

  1598.     if (!buf_size)

  1599.         return 0;

  1600. 

  1601.     AV_DEBUG("packet length %d \n", buf_size);

  1602. 

  1603.     init_get_bits(gb, buf, buf_size*8);

  1604. 

  1605.     len = vorbis_parse_audio_packet(vc);

  1606. 

  1607.     if (len <= 0) {

  1608.         *data_size = 0;

  1609.         return buf_size;

  1610.     }

  1611. 

  1612.     if (!vc->first_frame) {

  1613.         vc->first_frame = 1;

  1614.         *data_size = 0;

  1615.         return buf_size ;

  1616.     }

  1617. 

  1618.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1619. 

  1620.     if (vc->audio_channels > 8) {

  1621.         for (i = 0; i < vc->audio_channels; i++)

  1622.             channel_ptrs[i] = vc->channel_floors + i * len;

  1623.     } else {

  1624.         for (i = 0; i < vc->audio_channels; i++)

  1625.             channel_ptrs[i] = vc->channel_floors +

  1626.                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1627.     }

  1628. 

  1629.     vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);

  1630.     *data_size = len * 2 * vc->audio_channels;

  1631. 

  1632.     return buf_size ;

  1633. }

  1634. 

  1635. // Close decoder

  1636. 

  1637. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1638. {

  1639.     vorbis_context *vc = avccontext->priv_data;

  1640. 

  1641.     vorbis_free(vc);

  1642. 

  1643.     return 0 ;

  1644. }

  1645. 

  1646. AVCodec vorbis_decoder = {

  1647.     "vorbis",

  1648.     AVMEDIA_TYPE_AUDIO,

  1649.     CODEC_ID_VORBIS,

  1650.     sizeof(vorbis_context),

  1651.     vorbis_decode_init,

  1652.     NULL,

  1653.     vorbis_decode_close,

  1654.     vorbis_decode_frame,

  1655.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1656.     .channel_layouts = ff_vorbis_channel_layouts,

  1657. };