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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 partition_class[32];

  85.             uint_fast8_t class_dimensions[16];

  86.             uint_fast8_t class_subclasses[16];

  87.             uint_fast8_t class_masterbook[16];

  88.             int_fast16_t subclass_books[16][8];

  89.             uint_fast8_t multiplier;

  90.             uint_fast16_t x_list_dim;

  91.             vorbis_floor1_entry *list;

  92.         } t1;

  93.     } data;

  94. } vorbis_floor;

  95. 

  96. typedef struct {

  97.     uint_fast16_t type;

  98.     uint_fast32_t begin;

  99.     uint_fast32_t end;

  100.     uint_fast32_t partition_size;

  101.     uint_fast8_t  classifications;

  102.     uint_fast8_t  classbook;

  103.     int_fast16_t  books[64][8];

  104.     uint_fast8_t  maxpass;

  105.     uint_fast16_t ptns_to_read;

  106.     uint_fast8_t *classifs;

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

  166. #define VALIDATE_INDEX(idx, limit) \

  167.     if (idx >= limit) {\

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

  169.                idx_err_str,\

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

  171.         return -1;\

  172.     }

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

  174.     {\

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

  176.         VALIDATE_INDEX(idx, limit)\

  177.     }

  178. 

  179. static float vorbisfloat2float(uint_fast32_t val)

  180. {

  181.     double mant = val & 0x1fffff;

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

  183.     if (val & 0x80000000)

  184.         mant = -mant;

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

  186. }

  187. 

  188. 

  189. // Free all allocated memory -----------------------------------------

  190. 

  191. static void vorbis_free(vorbis_context *vc)

  192. {

  193.     int_fast16_t i;

  194. 

  195.     av_freep(&vc->channel_residues);

  196.     av_freep(&vc->channel_floors);

  197.     av_freep(&vc->saved);

  198. 

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

  200.         av_free(vc->residues[i].classifs);

  201.     av_freep(&vc->residues);

  202.     av_freep(&vc->modes);

  203. 

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

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

  206. 

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

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

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

  210.     }

  211.     av_freep(&vc->codebooks);

  212. 

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

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

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

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

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

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

  219.         } else {

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

  221.         }

  222.     }

  223.     av_freep(&vc->floors);

  224. 

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

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

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

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

  229.     }

  230.     av_freep(&vc->mappings);

  231. }

  232. 

  233. // Parse setup header -------------------------------------------------

  234. 

  235. // Process codebooks part

  236. 

  237. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  238. {

  239.     uint_fast16_t cb;

  240.     uint8_t  *tmp_vlc_bits;

  241.     uint32_t *tmp_vlc_codes;

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

  243.     uint_fast16_t *codebook_multiplicands;

  244. 

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

  246. 

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

  248. 

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

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

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

  252.     codebook_multiplicands = av_malloc(V_MAX_VLCS * sizeof(*codebook_multiplicands));

  253. 

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

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

  256.         uint_fast8_t ordered;

  257.         uint_fast32_t t, used_entries = 0;

  258.         uint_fast32_t entries;

  259. 

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

  261. 

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

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

  264.             goto error;

  265.         }

  266. 

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

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

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

  270.             goto error;

  271.         }

  272.         entries = get_bits(gb, 24);

  273.         if (entries > V_MAX_VLCS) {

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

  275.             goto error;

  276.         }

  277. 

  278.         ordered = get_bits1(gb);

  279. 

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

  281. 

  282.         if (!ordered) {

  283.             uint_fast16_t ce;

  284.             uint_fast8_t  flag;

  285.             uint_fast8_t  sparse = get_bits1(gb);

  286. 

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

  288. 

  289.             if (sparse) {

  290.                 AV_DEBUG(" sparse \n");

  291. 

  292.                 used_entries = 0;

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

  294.                     flag = get_bits1(gb);

  295.                     if (flag) {

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

  297.                         ++used_entries;

  298.                     } else

  299.                         tmp_vlc_bits[ce] = 0;

  300.                 }

  301.             } else {

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

  303. 

  304.                 used_entries = entries;

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

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

  307.             }

  308.         } else {

  309.             uint_fast16_t current_entry = 0;

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

  311. 

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

  313. 

  314.             used_entries = entries;

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

  316.                 uint_fast16_t i, number;

  317. 

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

  319. 

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

  321. 

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

  323. 

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

  325.                     if (i < used_entries)

  326.                         tmp_vlc_bits[i] = current_length;

  327. 

  328.                 current_entry+=number;

  329.             }

  330.             if (current_entry>used_entries) {

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

  332.                 goto error;

  333.             }

  334.         }

  335. 

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

  337. 

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

  339. 

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

  341. 

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

  343.             uint_fast16_t i, j, k;

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

  345. 

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

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

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

  349.             uint_fast8_t codebook_sequence_p = get_bits1(gb);

  350. 

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

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

  353. 

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

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

  356. 

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

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

  359.             }

  360. 

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

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

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

  364.                 uint_fast8_t dim = codebook_setup->dimensions;

  365. 

  366.                 if (tmp_vlc_bits[i]) {

  367.                     float last = 0.0;

  368.                     uint_fast32_t lookup_offset = i;

  369. 

  370. #ifdef V_DEBUG

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

  372. #endif

  373. 

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

  375.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  377.                         if (codebook_sequence_p)

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

  379.                         lookup_offset/=codebook_lookup_values;

  380.                     }

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

  382. 

  383. #ifdef V_DEBUG

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

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

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

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

  388. #endif

  389. 

  390.                     ++j;

  391.                 }

  392.             }

  393.             if (j != used_entries) {

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

  395.                 goto error;

  396.             }

  397.             entries = used_entries;

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

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

  400.             goto error;

  401.         }

  402. 

  403. // Initialize VLC table

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

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

  406.             goto error;

  407.         }

  408.         codebook_setup->maxdepth = 0;

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

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

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

  412. 

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

  414.             codebook_setup->nb_bits = V_NB_BITS2;

  415.         else

  416.             codebook_setup->nb_bits = V_NB_BITS;

  417. 

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

  419. 

  420.         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)) {

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

  422.             goto error;

  423.         }

  424.     }

  425. 

  426.     av_free(tmp_vlc_bits);

  427.     av_free(tmp_vlc_codes);

  428.     av_free(codebook_multiplicands);

  429.     return 0;

  430. 

  431. // Error:

  432. error:

  433.     av_free(tmp_vlc_bits);

  434.     av_free(tmp_vlc_codes);

  435.     av_free(codebook_multiplicands);

  436.     return -1;

  437. }

  438. 

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

  440. 

  441. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  442. {

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

  444.     uint_fast8_t i;

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

  446. 

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

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

  449. 

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

  451. 

  452.         if (vorbis_tdtransform) {

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

  454.             return -1;

  455.         }

  456.     }

  457.     return 0;

  458. }

  459. 

  460. // Process floors part

  461. 

  462. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  463.                                          vorbis_floor_data *vfu, float *vec);

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

  465. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  466.                                          vorbis_floor_data *vfu, float *vec);

  467. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  468. {

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

  470.     uint_fast16_t i,j,k;

  471. 

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

  473. 

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

  475. 

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

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

  478. 

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

  480. 

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

  482. 

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

  484.             int maximum_class = -1;

  485.             uint_fast8_t  rangebits;

  486.             uint_fast16_t floor1_values = 2;

  487. 

  488.             floor_setup->decode = vorbis_floor1_decode;

  489. 

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

  491. 

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

  493. 

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

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

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

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

  498. 

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

  500. 

  501.             }

  502. 

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

  504. 

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

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

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

  508. 

  509.                 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]);

  510. 

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

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

  513. 

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

  515.                 }

  516. 

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

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

  519.                     if (bits != -1)

  520.                         VALIDATE_INDEX(bits, vc->codebook_count)

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

  522. 

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

  524.                 }

  525.             }

  526. 

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

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

  529. 

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

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

  532. 

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

  534. 

  535. 

  536.             rangebits = get_bits(gb, 4);

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

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

  539. 

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

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

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

  543. 

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

  545.                 }

  546.             }

  547. 

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

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

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

  551.             uint_fast8_t max_codebook_dim = 0;

  552. 

  553.             floor_setup->decode = vorbis_floor0_decode;

  554. 

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

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

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

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

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

  560.              * 2^0 - 1 == 0                             */

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

  562.               av_log(vc->avccontext, AV_LOG_ERROR,

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

  564.               return -1;

  565.             }

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

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

  568. 

  569.             /* allocate mem for booklist */

  570.             floor_setup->data.t0.book_list =

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

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

  573.                 return -1;

  574.             /* read book indexes */

  575.             {

  576.                 int idx;

  577.                 uint_fast8_t book_idx;

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

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

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

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

  582.                 }

  583.             }

  584. 

  585.             create_map(vc, i);

  586. 

  587.             /* allocate mem for lsp coefficients */

  588.             {

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

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

  591.                 floor_setup->data.t0.lsp =

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

  593.                               * sizeof(float));

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

  595.                     return -1;

  596.             }

  597. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  611.             {

  612.               int idx;

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

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

  615.                            idx+1,

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

  617.               }

  618.             }

  619. #endif

  620.         } else {

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

  622.             return -1;

  623.         }

  624.     }

  625.     return 0;

  626. }

  627. 

  628. // Process residues part

  629. 

  630. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  631. {

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

  633.     uint_fast8_t i, j, k;

  634. 

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

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

  637. 

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

  639. 

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

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

  642.         uint_fast8_t cascade[64];

  643.         uint_fast8_t high_bits;

  644.         uint_fast8_t low_bits;

  645. 

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

  647. 

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

  649. 

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

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

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

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

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

  655.             res_setup->end > vc->avccontext->channels * vc->blocksize[1] / (res_setup->type == 2 ? 1 : 2) ||

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

  657.             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);

  658.             return -1;

  659.         }

  660. 

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

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

  663. 

  664.         res_setup->ptns_to_read =

  665.             (res_setup->end - res_setup->begin) / res_setup->partition_size;

  666.         res_setup->classifs = av_malloc(res_setup->ptns_to_read *

  667.                                         vc->audio_channels *

  668.                                         sizeof(*res_setup->classifs));

  669. 

  670.         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,

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

  672. 

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

  674.             high_bits = 0;

  675.             low_bits  = get_bits(gb, 3);

  676.             if (get_bits1(gb))

  677.                 high_bits = get_bits(gb, 5);

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

  679. 

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

  681.         }

  682. 

  683.         res_setup->maxpass = 0;

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

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

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

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

  688. 

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

  690. 

  691.                     if (k>res_setup->maxpass)

  692.                         res_setup->maxpass = k;

  693.                 } else {

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

  695.                 }

  696.             }

  697.         }

  698.     }

  699.     return 0;

  700. }

  701. 

  702. // Process mappings part

  703. 

  704. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  705. {

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

  707.     uint_fast8_t i, j;

  708. 

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

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

  711. 

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

  713. 

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

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

  716. 

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

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

  719.             return -1;

  720.         }

  721.         if (get_bits1(gb)) {

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

  723.         } else {

  724.             mapping_setup->submaps = 1;

  725.         }

  726. 

  727.         if (get_bits1(gb)) {

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

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

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

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

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

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

  734.             }

  735.         } else {

  736.             mapping_setup->coupling_steps = 0;

  737.         }

  738. 

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

  740. 

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

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

  743.             return -1; // following spec.

  744.         }

  745. 

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

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

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

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

  750.         }

  751. 

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

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

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

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

  756. 

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

  758.         }

  759.     }

  760.     return 0;

  761. }

  762. 

  763. // Process modes part

  764. 

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

  766. {

  767.     vorbis_floor *floors = vc->floors;

  768.     vorbis_floor0 *vf;

  769.     int idx;

  770.     int_fast8_t blockflag;

  771.     int_fast32_t *map;

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

  773. 

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

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

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

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

  778. 

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

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

  781. 

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

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

  784.                              ((vf->bark_map_size) /

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

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

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

  788.         }

  789.         map[n] = -1;

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

  791.     }

  792. 

  793. #   ifdef V_DEBUG

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

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

  796.                  idx, map[idx]);

  797.     }

  798. #   endif

  799. }

  800. 

  801. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  802. {

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

  804.     uint_fast8_t i;

  805. 

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

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

  808. 

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

  810. 

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

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

  813. 

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

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

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

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

  818. 

  819.         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);

  820.     }

  821.     return 0;

  822. }

  823. 

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

  825. 

  826. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  827. {

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

  829. 

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

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

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

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

  834.         return -1;

  835.     }

  836. 

  837.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  839.         return -2;

  840.     }

  841.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  843.         return -3;

  844.     }

  845.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  847.         return -4;

  848.     }

  849.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  851.         return -5;

  852.     }

  853.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  855.         return -6;

  856.     }

  857.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  859.         return -7;

  860.     }

  861.     if (!get_bits1(gb)) {

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

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

  864.     }

  865. 

  866.     return 0;

  867. }

  868. 

  869. // Process the identification header

  870. 

  871. static int vorbis_parse_id_hdr(vorbis_context *vc)

  872. {

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

  874.     uint_fast8_t bl0, bl1;

  875. 

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

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

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

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

  880.         return -1;

  881.     }

  882. 

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

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

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

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

  887.         return -1;

  888.     }

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

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

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

  892.         return -1;

  893.     }

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

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

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

  897.     bl0 = get_bits(gb, 4);

  898.     bl1 = get_bits(gb, 4);

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

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

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

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

  903.         return -3;

  904.     }

  905.     // output format int16

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

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

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

  909.         return -4;

  910.     }

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

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

  913. 

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

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

  916.         return -2;

  917.     }

  918. 

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

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

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

  922.     vc->previous_window  = 0;

  923. 

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

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

  926. 

  927.     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 ",

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

  929. 

  930. /*

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

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

  933.         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)));

  934.     }

  935. */

  936. 

  937.     return 0;

  938. }

  939. 

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

  941. 

  942. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  943. {

  944.     vorbis_context *vc = avccontext->priv_data ;

  945.     uint8_t *headers   = avccontext->extradata;

  946.     int headers_len    = avccontext->extradata_size;

  947.     uint8_t *header_start[3];

  948.     int header_len[3];

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

  950.     int hdr_type;

  951. 

  952.     vc->avccontext = avccontext;

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

  954. 

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

  956.         vc->add_bias = 385;

  957.         vc->exp_bias = 0;

  958.     } else {

  959.         vc->add_bias = 0;

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

  961.     }

  962. 

  963.     if (!headers_len) {

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

  965.         return -1;

  966.     }

  967. 

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

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

  970.         return -1;

  971.     }

  972. 

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

  974.     hdr_type = get_bits(gb, 8);

  975.     if (hdr_type != 1) {

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

  977.         return -1;

  978.     }

  979.     if (vorbis_parse_id_hdr(vc)) {

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

  981.         vorbis_free(vc);

  982.         return -1;

  983.     }

  984. 

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

  986.     hdr_type = get_bits(gb, 8);

  987.     if (hdr_type != 5) {

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

  989.         vorbis_free(vc);

  990.         return -1;

  991.     }

  992.     if (vorbis_parse_setup_hdr(vc)) {

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

  994.         vorbis_free(vc);

  995.         return -1;

  996.     }

  997. 

  998.     if (vc->audio_channels > 8)

  999.         avccontext->channel_layout = 0;

  1000.     else

  1001.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1002. 

  1003.     avccontext->channels    = vc->audio_channels;

  1004.     avccontext->sample_rate = vc->audio_samplerate;

  1005.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;

  1006.     avccontext->sample_fmt  = SAMPLE_FMT_S16;

  1007. 

  1008.     return 0 ;

  1009. }

  1010. 

  1011. // Decode audiopackets -------------------------------------------------

  1012. 

  1013. // Read and decode floor

  1014. 

  1015. static uint_fast8_t vorbis_floor0_decode(vorbis_context *vc,

  1016.                                          vorbis_floor_data *vfu, float *vec)

  1017. {

  1018.     vorbis_floor0 *vf = &vfu->t0;

  1019.     float *lsp = vf->lsp;

  1020.     uint_fast32_t amplitude;

  1021.     uint_fast32_t book_idx;

  1022.     uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;

  1023. 

  1024.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1025.     if (amplitude > 0) {

  1026.         float last = 0;

  1027.         uint_fast16_t lsp_len = 0;

  1028.         uint_fast16_t idx;

  1029.         vorbis_codebook codebook;

  1030. 

  1031.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1032.         if (book_idx >= vf->num_books) {

  1033.             av_log(vc->avccontext, AV_LOG_ERROR,

  1034.                     "floor0 dec: booknumber too high!\n");

  1035.             book_idx =  0;

  1036.             //FIXME: look above

  1037.         }

  1038.         AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);

  1039.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1040. 

  1041.         while (lsp_len<vf->order) {

  1042.             int vec_off;

  1043. 

  1044.             AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);

  1045.             AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1046.             /* read temp vector */

  1047.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1048.                                codebook.nb_bits, codebook.maxdepth)

  1049.                       * codebook.dimensions;

  1050.             AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);

  1051.             /* copy each vector component and add last to it */

  1052.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1053.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1054.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1055. 

  1056.             lsp_len += codebook.dimensions;

  1057.         }

  1058. #ifdef V_DEBUG

  1059.         /* DEBUG: output lsp coeffs */

  1060.         {

  1061.             int idx;

  1062.             for (idx = 0; idx < lsp_len; ++idx)

  1063.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1064.         }

  1065. #endif

  1066. 

  1067.         /* synthesize floor output vector */

  1068.         {

  1069.             int i;

  1070.             int order = vf->order;

  1071.             float wstep = M_PI / vf->bark_map_size;

  1072. 

  1073.             for (i = 0; i < order; i++)

  1074.                 lsp[i] = 2.0f * cos(lsp[i]);

  1075. 

  1076.             AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",

  1077.                      vf->map_size, order, wstep);

  1078. 

  1079.             i = 0;

  1080.             while (i < vf->map_size[blockflag]) {

  1081.                 int j, iter_cond = vf->map[blockflag][i];

  1082.                 float p = 0.5f;

  1083.                 float q = 0.5f;

  1084.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1085. 

  1086.                 /* similar part for the q and p products */

  1087.                 for (j = 0; j + 1 < order; j += 2) {

  1088.                     q *= lsp[j]     - two_cos_w;

  1089.                     p *= lsp[j + 1] - two_cos_w;

  1090.                 }

  1091.                 if (j == order) { // even order

  1092.                     p *= p * (2.0f - two_cos_w);

  1093.                     q *= q * (2.0f + two_cos_w);

  1094.                 } else { // odd order

  1095.                     q *= two_cos_w-lsp[j]; // one more time for q

  1096. 

  1097.                     /* final step and square */

  1098.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1099.                     q *= q;

  1100.                 }

  1101. 

  1102.                 /* calculate linear floor value */

  1103.                 {

  1104.                     q = exp((((amplitude*vf->amplitude_offset) /

  1105.                               (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1106.                              - vf->amplitude_offset) * .11512925f);

  1107.                 }

  1108. 

  1109.                 /* fill vector */

  1110.                 do {

  1111.                     vec[i] = q; ++i;

  1112.                 } while (vf->map[blockflag][i] == iter_cond);

  1113.             }

  1114.         }

  1115.     } else {

  1116.         /* this channel is unused */

  1117.         return 1;

  1118.     }

  1119. 

  1120.     AV_DEBUG(" Floor0 decoded\n");

  1121. 

  1122.     return 0;

  1123. }

  1124. 

  1125. static uint_fast8_t vorbis_floor1_decode(vorbis_context *vc,

  1126.                                          vorbis_floor_data *vfu, float *vec)

  1127. {

  1128.     vorbis_floor1 *vf = &vfu->t1;

  1129.     GetBitContext *gb = &vc->gb;

  1130.     uint_fast16_t range_v[4] = { 256, 128, 86, 64 };

  1131.     uint_fast16_t range = range_v[vf->multiplier-1];

  1132.     uint_fast16_t floor1_Y[258];

  1133.     uint_fast16_t floor1_Y_final[258];

  1134.     int floor1_flag[258];

  1135.     uint_fast8_t class_;

  1136.     uint_fast8_t cdim;

  1137.     uint_fast8_t cbits;

  1138.     uint_fast8_t csub;

  1139.     uint_fast8_t cval;

  1140.     int_fast16_t book;

  1141.     uint_fast16_t offset;

  1142.     uint_fast16_t i,j;

  1143.     /*u*/int_fast16_t adx, ady, off, predicted; // WTF ? dy/adx =  (unsigned)dy/adx ?

  1144.     int_fast16_t dy, err;

  1145. 

  1146. 

  1147.     if (!get_bits1(gb)) // silence

  1148.         return 1;

  1149. 

  1150. // Read values (or differences) for the floor's points

  1151. 

  1152.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1153.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1154. 

  1155.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1156. 

  1157.     offset = 2;

  1158.     for (i = 0; i < vf->partitions; ++i) {

  1159.         class_ = vf->partition_class[i];

  1160.         cdim   = vf->class_dimensions[class_];

  1161.         cbits  = vf->class_subclasses[class_];

  1162.         csub = (1 << cbits) - 1;

  1163.         cval = 0;

  1164. 

  1165.         AV_DEBUG("Cbits %d \n", cbits);

  1166. 

  1167.         if (cbits) // this reads all subclasses for this partition's class

  1168.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,

  1169.                             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);

  1170. 

  1171.         for (j = 0; j < cdim; ++j) {

  1172.             book = vf->subclass_books[class_][cval & csub];

  1173. 

  1174.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1175. 

  1176.             cval = cval >> cbits;

  1177.             if (book > -1) {

  1178.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1179.                 vc->codebooks[book].nb_bits, 3);

  1180.             } else {

  1181.                 floor1_Y[offset+j] = 0;

  1182.             }

  1183. 

  1184.             AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);

  1185.         }

  1186.         offset+=cdim;

  1187.     }

  1188. 

  1189. // Amplitude calculation from the differences

  1190. 

  1191.     floor1_flag[0] = 1;

  1192.     floor1_flag[1] = 1;

  1193.     floor1_Y_final[0] = floor1_Y[0];

  1194.     floor1_Y_final[1] = floor1_Y[1];

  1195. 

  1196.     for (i = 2; i < vf->x_list_dim; ++i) {

  1197.         uint_fast16_t val, highroom, lowroom, room;

  1198.         uint_fast16_t high_neigh_offs;

  1199.         uint_fast16_t low_neigh_offs;

  1200. 

  1201.         low_neigh_offs  = vf->list[i].low;

  1202.         high_neigh_offs = vf->list[i].high;

  1203.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1204.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1205.         ady = FFABS(dy);

  1206.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1207.         off = (int16_t)err / (int16_t)adx;

  1208.         if (dy < 0) {

  1209.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1210.         } else {

  1211.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1212.         } // render_point end

  1213. 

  1214.         val = floor1_Y[i];

  1215.         highroom = range-predicted;

  1216.         lowroom  = predicted;

  1217.         if (highroom < lowroom) {

  1218.             room = highroom * 2;

  1219.         } else {

  1220.             room = lowroom * 2;   // SPEC mispelling

  1221.         }

  1222.         if (val) {

  1223.             floor1_flag[low_neigh_offs]  = 1;

  1224.             floor1_flag[high_neigh_offs] = 1;

  1225.             floor1_flag[i]               = 1;

  1226.             if (val >= room) {

  1227.                 if (highroom > lowroom) {

  1228.                     floor1_Y_final[i] = val - lowroom + predicted;

  1229.                 } else {

  1230.                     floor1_Y_final[i] = predicted - val + highroom - 1;

  1231.                 }

  1232.             } else {

  1233.                 if (val & 1) {

  1234.                     floor1_Y_final[i] = predicted - (val + 1) / 2;

  1235.                 } else {

  1236.                     floor1_Y_final[i] = predicted + val / 2;

  1237.                 }

  1238.             }

  1239.         } else {

  1240.             floor1_flag[i]    = 0;

  1241.             floor1_Y_final[i] = predicted;

  1242.         }

  1243. 

  1244.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);

  1245.     }

  1246. 

  1247. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1248. 

  1249.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1250. 

  1251.     AV_DEBUG(" Floor decoded\n");

  1252. 

  1253.     return 0;

  1254. }

  1255. 

  1256. // Read and decode residue

  1257. 

  1258. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1259.                                                            vorbis_residue *vr,

  1260.                                                            uint_fast8_t ch,

  1261.                                                            uint_fast8_t *do_not_decode,

  1262.                                                            float *vec,

  1263.                                                            uint_fast16_t vlen,

  1264.                                                            int vr_type)

  1265. {

  1266.     GetBitContext *gb = &vc->gb;

  1267.     uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;

  1268.     uint_fast16_t ptns_to_read = vr->ptns_to_read;

  1269.     uint_fast8_t *classifs = vr->classifs;

  1270.     uint_fast8_t pass;

  1271.     uint_fast8_t ch_used;

  1272.     uint_fast8_t i,j,l;

  1273.     uint_fast16_t k;

  1274. 

  1275.     if (vr_type == 2) {

  1276.         for (j = 1; j < ch; ++j)

  1277.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1278.         if (do_not_decode[0])

  1279.             return 0;

  1280.         ch_used = 1;

  1281.     } else {

  1282.         ch_used = ch;

  1283.     }

  1284. 

  1285.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1286. 

  1287.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1288.         uint_fast16_t voffset;

  1289.         uint_fast16_t partition_count;

  1290.         uint_fast16_t j_times_ptns_to_read;

  1291. 

  1292.         voffset = vr->begin;

  1293.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1294.             if (!pass) {

  1295.                 uint_fast32_t inverse_class = ff_inverse[vr->classifications];

  1296.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1297.                     if (!do_not_decode[j]) {

  1298.                         uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1299.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1300. 

  1301.                         AV_DEBUG("Classword: %d \n", temp);

  1302. 

  1303.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1304.                         for (i = 0; i < c_p_c; ++i) {

  1305.                             uint_fast32_t temp2;

  1306. 

  1307.                             temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;

  1308.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1309.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1310.                             temp = temp2;

  1311.                         }

  1312.                     }

  1313.                     j_times_ptns_to_read += ptns_to_read;

  1314.                 }

  1315.             }

  1316.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1317.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1318.                     uint_fast16_t voffs;

  1319. 

  1320.                     if (!do_not_decode[j]) {

  1321.                         uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];

  1322.                         int_fast16_t vqbook = vr->books[vqclass][pass];

  1323. 

  1324.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1325.                             uint_fast16_t coffs;

  1326.                             unsigned dim =  vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64

  1327.                             uint_fast16_t step = dim == 1 ? vr->partition_size

  1328.                                                           : FASTDIV(vr->partition_size, dim);

  1329.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1330. 

  1331.                             if (vr_type == 0) {

  1332. 

  1333.                                 voffs = voffset+j*vlen;

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

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

  1336.                                     for (l = 0; l < dim; ++l)

  1337.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH

  1338.                                 }

  1339.                             } else if (vr_type == 1) {

  1340.                                 voffs = voffset + j * vlen;

  1341.                                 for (k = 0; k < step; ++k) {

  1342.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1343.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1344.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1345. 

  1346.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1347.                                     }

  1348.                                 }

  1349.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1350.                                 voffs = voffset >> 1;

  1351. 

  1352.                                 if (dim == 2) {

  1353.                                     for (k = 0; k < step; ++k) {

  1354.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1355.                                         vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH

  1356.                                         vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH

  1357.                                     }

  1358.                                 } else if (dim == 4) {

  1359.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1360.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

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

  1362.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH

  1363.                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH

  1364.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH

  1365.                                     }

  1366.                                 } else

  1367.                                 for (k = 0; k < step; ++k) {

  1368.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1369.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1370.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH

  1371.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH

  1372. 

  1373.                                         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);

  1374.                                     }

  1375.                                 }

  1376. 

  1377.                             } else if (vr_type == 2) {

  1378.                                 voffs = voffset;

  1379. 

  1380.                                 for (k = 0; k < step; ++k) {

  1381.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1382.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1383.                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %

  1384. 

  1385.                                         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);

  1386.                                     }

  1387.                                 }

  1388.                             }

  1389.                         }

  1390.                     }

  1391.                     j_times_ptns_to_read += ptns_to_read;

  1392.                 }

  1393.                 ++partition_count;

  1394.                 voffset += vr->partition_size;

  1395.             }

  1396.         }

  1397.     }

  1398.     return 0;

  1399. }

  1400. 

  1401. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1402.                                         uint_fast8_t ch,

  1403.                                         uint_fast8_t *do_not_decode,

  1404.                                         float *vec, uint_fast16_t vlen)

  1405. {

  1406.     if (vr->type == 2)

  1407.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1408.     else if (vr->type == 1)

  1409.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1410.     else if (vr->type == 0)

  1411.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1412.     else {

  1413.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1414.         return -1;

  1415.     }

  1416. }

  1417. 

  1418. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1419. {

  1420.     int i;

  1421.     for (i = 0;  i < blocksize;  i++) {

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

  1423.             if (ang[i] > 0.0) {

  1424.                 ang[i] = mag[i] - ang[i];

  1425.             } else {

  1426.                 float temp = ang[i];

  1427.                 ang[i]     = mag[i];

  1428.                 mag[i]    += temp;

  1429.             }

  1430.         } else {

  1431.             if (ang[i] > 0.0) {

  1432.                 ang[i] += mag[i];

  1433.             } else {

  1434.                 float temp = ang[i];

  1435.                 ang[i]     = mag[i];

  1436.                 mag[i]    -= temp;

  1437.             }

  1438.         }

  1439.     }

  1440. }

  1441. 

  1442. static void copy_normalize(float *dst, float *src, int len, int exp_bias,

  1443.                            float add_bias)

  1444. {

  1445.     int i;

  1446.     if (exp_bias) {

  1447.         memcpy(dst, src, len * sizeof(float));

  1448.     } else {

  1449.         for (i = 0; i < len; i++)

  1450.             dst[i] = src[i] + add_bias;

  1451.     }

  1452. }

  1453. 

  1454. // Decode the audio packet using the functions above

  1455. 

  1456. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1457. {

  1458.     GetBitContext *gb = &vc->gb;

  1459. 

  1460.     uint_fast8_t previous_window = vc->previous_window;

  1461.     uint_fast8_t mode_number;

  1462.     uint_fast8_t blockflag;

  1463.     uint_fast16_t blocksize;

  1464.     int_fast32_t i,j;

  1465.     uint_fast8_t no_residue[255];

  1466.     uint_fast8_t do_not_decode[255];

  1467.     vorbis_mapping *mapping;

  1468.     float *ch_res_ptr   = vc->channel_residues;

  1469.     float *ch_floor_ptr = vc->channel_floors;

  1470.     uint_fast8_t res_chan[255];

  1471.     uint_fast8_t res_num = 0;

  1472.     int_fast16_t retlen  = 0;

  1473.     float fadd_bias = vc->add_bias;

  1474. 

  1475.     if (get_bits1(gb)) {

  1476.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1477.         return -1; // packet type not audio

  1478.     }

  1479. 

  1480.     if (vc->mode_count == 1) {

  1481.         mode_number = 0;

  1482.     } else {

  1483.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1484.     }

  1485.     vc->mode_number = mode_number;

  1486.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1487. 

  1488.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1489. 

  1490.     blockflag = vc->modes[mode_number].blockflag;

  1491.     blocksize = vc->blocksize[blockflag];

  1492.     if (blockflag)

  1493.         skip_bits(gb, 2); // previous_window, next_window

  1494. 

  1495.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1496.     memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1497. 

  1498. // Decode floor

  1499. 

  1500.     for (i = 0; i < vc->audio_channels; ++i) {

  1501.         vorbis_floor *floor;

  1502.         if (mapping->submaps > 1) {

  1503.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1504.         } else {

  1505.             floor = &vc->floors[mapping->submap_floor[0]];

  1506.         }

  1507. 

  1508.         no_residue[i] = floor->decode(vc, &floor->data, ch_floor_ptr);

  1509.         ch_floor_ptr += blocksize / 2;

  1510.     }

  1511. 

  1512. // Nonzero vector propagate

  1513. 

  1514.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1515.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1516.             no_residue[mapping->magnitude[i]] = 0;

  1517.             no_residue[mapping->angle[i]]     = 0;

  1518.         }

  1519.     }

  1520. 

  1521. // Decode residue

  1522. 

  1523.     for (i = 0; i < mapping->submaps; ++i) {

  1524.         vorbis_residue *residue;

  1525.         uint_fast8_t ch = 0;

  1526. 

  1527.         for (j = 0; j < vc->audio_channels; ++j) {

  1528.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1529.                 res_chan[j] = res_num;

  1530.                 if (no_residue[j]) {

  1531.                     do_not_decode[ch] = 1;

  1532.                 } else {

  1533.                     do_not_decode[ch] = 0;

  1534.                 }

  1535.                 ++ch;

  1536.                 ++res_num;

  1537.             }

  1538.         }

  1539.         residue = &vc->residues[mapping->submap_residue[i]];

  1540.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1541. 

  1542.         ch_res_ptr += ch * blocksize / 2;

  1543.     }

  1544. 

  1545. // Inverse coupling

  1546. 

  1547.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1548.         float *mag, *ang;

  1549. 

  1550.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

  1551.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1552.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1553.     }

  1554. 

  1555. // Dotproduct, MDCT

  1556. 

  1557.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1558.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;

  1559.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1560.         vc->dsp.vector_fmul(ch_floor_ptr, ch_res_ptr, blocksize / 2);

  1561.         ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);

  1562.     }

  1563. 

  1564. // Overlap/add, save data for next overlapping  FPMATH

  1565. 

  1566.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

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

  1568.         uint_fast16_t bs0 = vc->blocksize[0];

  1569.         uint_fast16_t bs1 = vc->blocksize[1];

  1570.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1571.         float *saved      = vc->saved + j * bs1 / 4;

  1572.         float *ret        = vc->channel_floors + j * retlen;

  1573.         float *buf        = residue;

  1574.         const float *win  = vc->win[blockflag & previous_window];

  1575. 

  1576.         if (blockflag == previous_window) {

  1577.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, blocksize / 4);

  1578.         } else if (blockflag > previous_window) {

  1579.             vc->dsp.vector_fmul_window(ret, saved, buf, win, fadd_bias, bs0 / 4);

  1580.             copy_normalize(ret+bs0/2, buf+bs0/4, (bs1-bs0)/4, vc->exp_bias, fadd_bias);

  1581.         } else {

  1582.             copy_normalize(ret, saved, (bs1 - bs0) / 4, vc->exp_bias, fadd_bias);

  1583.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, fadd_bias, bs0 / 4);

  1584.         }

  1585.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1586.     }

  1587. 

  1588.     vc->previous_window = blockflag;

  1589.     return retlen;

  1590. }

  1591. 

  1592. // Return the decoded audio packet through the standard api

  1593. 

  1594. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1595.                                void *data, int *data_size,

  1596.                                AVPacket *avpkt)

  1597. {

  1598.     const uint8_t *buf = avpkt->data;

  1599.     int buf_size       = avpkt->size;

  1600.     vorbis_context *vc = avccontext->priv_data ;

  1601.     GetBitContext *gb = &(vc->gb);

  1602.     const float *channel_ptrs[255];

  1603.     int i;

  1604. 

  1605.     int_fast16_t len;

  1606. 

  1607.     if (!buf_size)

  1608.         return 0;

  1609. 

  1610.     AV_DEBUG("packet length %d \n", buf_size);

  1611. 

  1612.     init_get_bits(gb, buf, buf_size*8);

  1613. 

  1614.     len = vorbis_parse_audio_packet(vc);

  1615. 

  1616.     if (len <= 0) {

  1617.         *data_size = 0;

  1618.         return buf_size;

  1619.     }

  1620. 

  1621.     if (!vc->first_frame) {

  1622.         vc->first_frame = 1;

  1623.         *data_size = 0;

  1624.         return buf_size ;

  1625.     }

  1626. 

  1627.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1628. 

  1629.     if (vc->audio_channels > 8) {

  1630.         for (i = 0; i < vc->audio_channels; i++)

  1631.             channel_ptrs[i] = vc->channel_floors + i * len;

  1632.     } else {

  1633.         for (i = 0; i < vc->audio_channels; i++)

  1634.             channel_ptrs[i] = vc->channel_floors +

  1635.                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1636.     }

  1637. 

  1638.     vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);

  1639.     *data_size = len * 2 * vc->audio_channels;

  1640. 

  1641.     return buf_size ;

  1642. }

  1643. 

  1644. // Close decoder

  1645. 

  1646. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1647. {

  1648.     vorbis_context *vc = avccontext->priv_data;

  1649. 

  1650.     vorbis_free(vc);

  1651. 

  1652.     return 0 ;

  1653. }

  1654. 

  1655. AVCodec vorbis_decoder = {

  1656.     "vorbis",

  1657.     AVMEDIA_TYPE_AUDIO,

  1658.     CODEC_ID_VORBIS,

  1659.     sizeof(vorbis_context),

  1660.     vorbis_decode_init,

  1661.     NULL,

  1662.     vorbis_decode_close,

  1663.     vorbis_decode_frame,

  1664.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1665.     .channel_layouts = ff_vorbis_channel_layouts,

  1666. };