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FFmpeg/libavcodec/vorbisdec.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 Libav.

  7.  *

  8.  * Libav 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.  * Libav 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 Libav; 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. #include "fmtconvert.h"

  35. 

  36. #include "vorbis.h"

  37. #include "xiph.h"

  38. 

  39. #define V_NB_BITS 8

  40. #define V_NB_BITS2 11

  41. #define V_MAX_VLCS (1 << 16)

  42. #define V_MAX_PARTITIONS (1 << 20)

  43. 

  44. #ifndef V_DEBUG

  45. #define AV_DEBUG(...)

  46. #endif

  47. 

  48. #undef NDEBUG

  49. #include <assert.h>

  50. 

  51. typedef struct {

  52.     uint_fast8_t dimensions;

  53.     uint_fast8_t lookup_type;

  54.     uint_fast8_t maxdepth;

  55.     VLC vlc;

  56.     float *codevectors;

  57.     unsigned int nb_bits;

  58. } vorbis_codebook;

  59. 

  60. typedef union  vorbis_floor_u  vorbis_floor_data;

  61. typedef struct vorbis_floor0_s vorbis_floor0;

  62. typedef struct vorbis_floor1_s vorbis_floor1;

  63. struct vorbis_context_s;

  64. typedef

  65. int (* vorbis_floor_decode_func)

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

  67. typedef struct {

  68.     uint_fast8_t floor_type;

  69.     vorbis_floor_decode_func decode;

  70.     union vorbis_floor_u {

  71.         struct vorbis_floor0_s {

  72.             uint_fast8_t  order;

  73.             uint_fast16_t rate;

  74.             uint_fast16_t bark_map_size;

  75.             int_fast32_t *map[2];

  76.             uint_fast32_t map_size[2];

  77.             uint_fast8_t  amplitude_bits;

  78.             uint_fast8_t  amplitude_offset;

  79.             uint_fast8_t  num_books;

  80.             uint_fast8_t *book_list;

  81.             float        *lsp;

  82.         } t0;

  83.         struct vorbis_floor1_s {

  84.             uint_fast8_t partitions;

  85.             uint8_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.     unsigned      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.     uint_fast16_t ptns_to_read;

  107.     uint8_t *classifs;

  108. } vorbis_residue;

  109. 

  110. typedef struct {

  111.     uint_fast8_t  submaps;

  112.     uint_fast16_t coupling_steps;

  113.     uint_fast8_t *magnitude;

  114.     uint_fast8_t *angle;

  115.     uint_fast8_t *mux;

  116.     uint_fast8_t  submap_floor[16];

  117.     uint_fast8_t  submap_residue[16];

  118. } vorbis_mapping;

  119. 

  120. typedef struct {

  121.     uint_fast8_t  blockflag;

  122.     uint_fast16_t windowtype;

  123.     uint_fast16_t transformtype;

  124.     uint_fast8_t  mapping;

  125. } vorbis_mode;

  126. 

  127. typedef struct vorbis_context_s {

  128.     AVCodecContext *avccontext;

  129.     GetBitContext gb;

  130.     DSPContext dsp;

  131.     FmtConvertContext fmt_conv;

  132. 

  133.     FFTContext mdct[2];

  134.     uint_fast8_t  first_frame;

  135.     uint_fast32_t version;

  136.     uint_fast8_t  audio_channels;

  137.     uint_fast32_t audio_samplerate;

  138.     uint_fast32_t bitrate_maximum;

  139.     uint_fast32_t bitrate_nominal;

  140.     uint_fast32_t bitrate_minimum;

  141.     uint_fast32_t blocksize[2];

  142.     const float  *win[2];

  143.     uint_fast16_t codebook_count;

  144.     vorbis_codebook *codebooks;

  145.     uint_fast8_t  floor_count;

  146.     vorbis_floor *floors;

  147.     uint_fast8_t  residue_count;

  148.     vorbis_residue *residues;

  149.     uint_fast8_t  mapping_count;

  150.     vorbis_mapping *mappings;

  151.     uint_fast8_t  mode_count;

  152.     vorbis_mode  *modes;

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

  154.     uint_fast8_t  previous_window;

  155.     float        *channel_residues;

  156.     float        *channel_floors;

  157.     float        *saved;

  158.     float         scale_bias; // for float->int conversion

  159. } vorbis_context;

  160. 

  161. /* Helper functions */

  162. 

  163. #define BARK(x) \

  164.     (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))

  165. 

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

  167. #define VALIDATE_INDEX(idx, limit) \

  168.     if (idx >= limit) {\

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

  170.                idx_err_str,\

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

  172.         return -1;\

  173.     }

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

  175.     {\

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

  177.         VALIDATE_INDEX(idx, limit)\

  178.     }

  179. 

  180. static float vorbisfloat2float(uint_fast32_t val)

  181. {

  182.     double mant = val & 0x1fffff;

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

  184.     if (val & 0x80000000)

  185.         mant = -mant;

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

  187. }

  188. 

  189. 

  190. // Free all allocated memory -----------------------------------------

  191. 

  192. static void vorbis_free(vorbis_context *vc)

  193. {

  194.     int_fast16_t i;

  195. 

  196.     av_freep(&vc->channel_residues);

  197.     av_freep(&vc->channel_floors);

  198.     av_freep(&vc->saved);

  199. 

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

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

  202.     av_freep(&vc->residues);

  203.     av_freep(&vc->modes);

  204. 

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

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

  207. 

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

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

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

  211.     }

  212.     av_freep(&vc->codebooks);

  213. 

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

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

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

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

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

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

  220.         } else {

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

  222.         }

  223.     }

  224.     av_freep(&vc->floors);

  225. 

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

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

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

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

  230.     }

  231.     av_freep(&vc->mappings);

  232. }

  233. 

  234. // Parse setup header -------------------------------------------------

  235. 

  236. // Process codebooks part

  237. 

  238. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  239. {

  240.     uint_fast16_t cb;

  241.     uint8_t  *tmp_vlc_bits;

  242.     uint32_t *tmp_vlc_codes;

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

  244.     uint_fast16_t *codebook_multiplicands;

  245. 

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

  247. 

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

  249. 

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

  251.     tmp_vlc_bits  = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_bits));

  252.     tmp_vlc_codes = av_mallocz(V_MAX_VLCS * sizeof(*tmp_vlc_codes));

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

  254. 

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

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

  257.         uint_fast8_t ordered;

  258.         uint_fast32_t t, used_entries = 0;

  259.         uint_fast32_t entries;

  260. 

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

  262. 

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

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

  265.             goto error;

  266.         }

  267. 

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

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

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

  271.             goto error;

  272.         }

  273.         entries = get_bits(gb, 24);

  274.         if (entries > V_MAX_VLCS) {

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

  276.             goto error;

  277.         }

  278. 

  279.         ordered = get_bits1(gb);

  280. 

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

  282. 

  283.         if (!ordered) {

  284.             uint_fast16_t ce;

  285.             uint_fast8_t  flag;

  286.             uint_fast8_t  sparse = get_bits1(gb);

  287. 

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

  289. 

  290.             if (sparse) {

  291.                 AV_DEBUG(" sparse \n");

  292. 

  293.                 used_entries = 0;

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

  295.                     flag = get_bits1(gb);

  296.                     if (flag) {

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

  298.                         ++used_entries;

  299.                     } else

  300.                         tmp_vlc_bits[ce] = 0;

  301.                 }

  302.             } else {

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

  304. 

  305.                 used_entries = entries;

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

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

  308.             }

  309.         } else {

  310.             uint_fast16_t current_entry = 0;

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

  312. 

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

  314. 

  315.             used_entries = entries;

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

  317.                 uint_fast16_t i, number;

  318. 

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

  320. 

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

  322. 

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

  324. 

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

  326.                     if (i < used_entries)

  327.                         tmp_vlc_bits[i] = current_length;

  328. 

  329.                 current_entry+=number;

  330.             }

  331.             if (current_entry>used_entries) {

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

  333.                 goto error;

  334.             }

  335.         }

  336. 

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

  338. 

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

  340. 

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

  342. 

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

  344.             uint_fast16_t i, j, k;

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

  346. 

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

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

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

  350.             uint_fast8_t codebook_sequence_p = get_bits1(gb);

  351. 

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

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

  354. 

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

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

  357. 

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

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

  360.             }

  361. 

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

  363.             codebook_setup->codevectors = used_entries ? av_mallocz(used_entries *

  364.                                                                     codebook_setup->dimensions *

  365.                                                                     sizeof(*codebook_setup->codevectors))

  366.                                                        : NULL;

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

  368.                 uint_fast8_t dim = codebook_setup->dimensions;

  369. 

  370.                 if (tmp_vlc_bits[i]) {

  371.                     float last = 0.0;

  372.                     uint_fast32_t lookup_offset = i;

  373. 

  374. #ifdef V_DEBUG

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

  376. #endif

  377. 

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

  379.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  381.                         if (codebook_sequence_p)

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

  383.                         lookup_offset/=codebook_lookup_values;

  384.                     }

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

  386. 

  387. #ifdef V_DEBUG

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

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

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

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

  392. #endif

  393. 

  394.                     ++j;

  395.                 }

  396.             }

  397.             if (j != used_entries) {

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

  399.                 goto error;

  400.             }

  401.             entries = used_entries;

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

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

  404.             goto error;

  405.         }

  406. 

  407. // Initialize VLC table

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

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

  410.             goto error;

  411.         }

  412.         codebook_setup->maxdepth = 0;

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

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

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

  416. 

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

  418.             codebook_setup->nb_bits = V_NB_BITS2;

  419.         else

  420.             codebook_setup->nb_bits = V_NB_BITS;

  421. 

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

  423. 

  424.         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)) {

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

  426.             goto error;

  427.         }

  428.     }

  429. 

  430.     av_free(tmp_vlc_bits);

  431.     av_free(tmp_vlc_codes);

  432.     av_free(codebook_multiplicands);

  433.     return 0;

  434. 

  435. // Error:

  436. error:

  437.     av_free(tmp_vlc_bits);

  438.     av_free(tmp_vlc_codes);

  439.     av_free(codebook_multiplicands);

  440.     return -1;

  441. }

  442. 

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

  444. 

  445. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  446. {

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

  448.     uint_fast8_t i;

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

  450. 

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

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

  453. 

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

  455. 

  456.         if (vorbis_tdtransform) {

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

  458.             return -1;

  459.         }

  460.     }

  461.     return 0;

  462. }

  463. 

  464. // Process floors part

  465. 

  466. static int vorbis_floor0_decode(vorbis_context *vc,

  467.                                 vorbis_floor_data *vfu, float *vec);

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

  469. static int vorbis_floor1_decode(vorbis_context *vc,

  470.                                 vorbis_floor_data *vfu, float *vec);

  471. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  472. {

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

  474.     int i,j,k;

  475. 

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

  477. 

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

  479. 

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

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

  482. 

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

  484. 

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

  486. 

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

  488.             int maximum_class = -1;

  489.             uint_fast8_t  rangebits;

  490.             uint_fast32_t rangemax;

  491.             uint_fast16_t floor1_values = 2;

  492. 

  493.             floor_setup->decode = vorbis_floor1_decode;

  494. 

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

  496. 

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

  498. 

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

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

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

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

  503. 

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

  505. 

  506.             }

  507. 

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

  509. 

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

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

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

  513. 

  514.                 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]);

  515. 

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

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

  518. 

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

  520.                 }

  521. 

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

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

  524.                     if (bits != -1)

  525.                         VALIDATE_INDEX(bits, vc->codebook_count)

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

  527. 

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

  529.                 }

  530.             }

  531. 

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

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

  534. 

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

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

  537. 

  538.             floor_setup->data.t1.list = av_mallocz(floor_setup->data.t1.x_list_dim *

  539.                                                    sizeof(*floor_setup->data.t1.list));

  540. 

  541. 

  542.             rangebits = get_bits(gb, 4);

  543.             rangemax = (1 << rangebits);

  544.             if (rangemax > vc->blocksize[1] / 2) {

  545.                 av_log(vc->avccontext, AV_LOG_ERROR,

  546.                        "Floor value is too large for blocksize: %"PRIuFAST32" (%"PRIuFAST32")\n",

  547.                        rangemax, vc->blocksize[1] / 2);

  548.                 return -1;

  549.             }

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

  551.             floor_setup->data.t1.list[1].x = rangemax;

  552. 

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

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

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

  556. 

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

  558.                 }

  559.             }

  560. 

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

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

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

  564.             uint_fast8_t max_codebook_dim = 0;

  565. 

  566.             floor_setup->decode = vorbis_floor0_decode;

  567. 

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

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

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

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

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

  573.              * 2^0 - 1 == 0                             */

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

  575.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

  577.                 return -1;

  578.             }

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

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

  581. 

  582.             /* allocate mem for booklist */

  583.             floor_setup->data.t0.book_list =

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

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

  586.                 return -1;

  587.             /* read book indexes */

  588.             {

  589.                 int idx;

  590.                 uint_fast8_t book_idx;

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

  592.                     GET_VALIDATED_INDEX(book_idx, 8, vc->codebook_count)

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

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

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

  596.                 }

  597.             }

  598. 

  599.             create_map(vc, i);

  600. 

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

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

  603.             floor_setup->data.t0.lsp =

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

  605.                           * sizeof(*floor_setup->data.t0.lsp));

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

  607.                 return -1;

  608. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  622.             {

  623.                 int idx;

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

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

  626.                              idx+1,

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

  628.                 }

  629.             }

  630. #endif

  631.         } else {

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

  633.             return -1;

  634.         }

  635.     }

  636.     return 0;

  637. }

  638. 

  639. // Process residues part

  640. 

  641. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  642. {

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

  644.     uint_fast8_t i, j, k;

  645. 

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

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

  648. 

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

  650. 

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

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

  653.         uint_fast8_t cascade[64];

  654.         uint_fast8_t high_bits;

  655.         uint_fast8_t low_bits;

  656. 

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

  658. 

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

  660. 

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

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

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

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

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

  666.             res_setup->end > vc->avccontext->channels * vc->blocksize[1] / 2 ||

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

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

  669.             return -1;

  670.         }

  671. 

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

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

  674. 

  675.         res_setup->ptns_to_read =

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

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

  678.                                         vc->audio_channels *

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

  680.         if (!res_setup->classifs)

  681.             return AVERROR(ENOMEM);

  682. 

  683.         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,

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

  685. 

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

  687.             high_bits = 0;

  688.             low_bits  = get_bits(gb, 3);

  689.             if (get_bits1(gb))

  690.                 high_bits = get_bits(gb, 5);

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

  692. 

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

  694.         }

  695. 

  696.         res_setup->maxpass = 0;

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

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

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

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

  701. 

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

  703. 

  704.                     if (k>res_setup->maxpass)

  705.                         res_setup->maxpass = k;

  706.                 } else {

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

  708.                 }

  709.             }

  710.         }

  711.     }

  712.     return 0;

  713. }

  714. 

  715. // Process mappings part

  716. 

  717. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  718. {

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

  720.     uint_fast8_t i, j;

  721. 

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

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

  724. 

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

  726. 

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

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

  729. 

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

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

  732.             return -1;

  733.         }

  734.         if (get_bits1(gb)) {

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

  736.         } else {

  737.             mapping_setup->submaps = 1;

  738.         }

  739. 

  740.         if (get_bits1(gb)) {

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

  742.             mapping_setup->magnitude      = av_mallocz(mapping_setup->coupling_steps *

  743.                                                        sizeof(*mapping_setup->magnitude));

  744.             mapping_setup->angle          = av_mallocz(mapping_setup->coupling_steps *

  745.                                                        sizeof(*mapping_setup->angle));

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

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

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

  749.             }

  750.         } else {

  751.             mapping_setup->coupling_steps = 0;

  752.         }

  753. 

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

  755. 

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

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

  758.             return -1; // following spec.

  759.         }

  760. 

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

  762.             mapping_setup->mux = av_mallocz(vc->audio_channels *

  763.                                             sizeof(*mapping_setup->mux));

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

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

  766.         }

  767. 

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

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

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

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

  772. 

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

  774.         }

  775.     }

  776.     return 0;

  777. }

  778. 

  779. // Process modes part

  780. 

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

  782. {

  783.     vorbis_floor *floors = vc->floors;

  784.     vorbis_floor0 *vf;

  785.     int idx;

  786.     int_fast8_t blockflag;

  787.     int_fast32_t *map;

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

  789. 

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

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

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

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

  794. 

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

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

  797. 

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

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

  800.                              ((vf->bark_map_size) /

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

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

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

  804.         }

  805.         map[n] = -1;

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

  807.     }

  808. 

  809. #ifdef V_DEBUG

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

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

  812.                  idx, map[idx]);

  813.     }

  814. #endif

  815. }

  816. 

  817. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  818. {

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

  820.     uint_fast8_t i;

  821. 

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

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

  824. 

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

  826. 

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

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

  829. 

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

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

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

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

  834. 

  835.         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);

  836.     }

  837.     return 0;

  838. }

  839. 

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

  841. 

  842. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  843. {

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

  845. 

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

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

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

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

  850.         return -1;

  851.     }

  852. 

  853.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  855.         return -2;

  856.     }

  857.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  859.         return -3;

  860.     }

  861.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  863.         return -4;

  864.     }

  865.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  867.         return -5;

  868.     }

  869.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  871.         return -6;

  872.     }

  873.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  875.         return -7;

  876.     }

  877.     if (!get_bits1(gb)) {

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

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

  880.     }

  881. 

  882.     return 0;

  883. }

  884. 

  885. // Process the identification header

  886. 

  887. static int vorbis_parse_id_hdr(vorbis_context *vc)

  888. {

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

  890.     uint_fast8_t bl0, bl1;

  891. 

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

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

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

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

  896.         return -1;

  897.     }

  898. 

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

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

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

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

  903.         return -1;

  904.     }

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

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

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

  908.         return -1;

  909.     }

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

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

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

  913.     bl0 = get_bits(gb, 4);

  914.     bl1 = get_bits(gb, 4);

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

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

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

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

  919.         return -3;

  920.     }

  921.     // output format int16

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

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

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

  925.         return -4;

  926.     }

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

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

  929. 

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

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

  932.         return -2;

  933.     }

  934. 

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

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

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

  938.     vc->previous_window  = 0;

  939. 

  940.     ff_mdct_init(&vc->mdct[0], bl0, 1, -vc->scale_bias);

  941.     ff_mdct_init(&vc->mdct[1], bl1, 1, -vc->scale_bias);

  942. 

  943.     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 ",

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

  945. 

  946. /*

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

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

  949.         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)));

  950.     }

  951. */

  952. 

  953.     return 0;

  954. }

  955. 

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

  957. 

  958. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  959. {

  960.     vorbis_context *vc = avccontext->priv_data ;

  961.     uint8_t *headers   = avccontext->extradata;

  962.     int headers_len    = avccontext->extradata_size;

  963.     uint8_t *header_start[3];

  964.     int header_len[3];

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

  966.     int hdr_type;

  967. 

  968.     vc->avccontext = avccontext;

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

  970.     ff_fmt_convert_init(&vc->fmt_conv, avccontext);

  971. 

  972.     vc->scale_bias = 32768.0f;

  973. 

  974.     if (!headers_len) {

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

  976.         return -1;

  977.     }

  978. 

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

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

  981.         return -1;

  982.     }

  983. 

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

  985.     hdr_type = get_bits(gb, 8);

  986.     if (hdr_type != 1) {

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

  988.         return -1;

  989.     }

  990.     if (vorbis_parse_id_hdr(vc)) {

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

  992.         vorbis_free(vc);

  993.         return -1;

  994.     }

  995. 

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

  997.     hdr_type = get_bits(gb, 8);

  998.     if (hdr_type != 5) {

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

  1000.         vorbis_free(vc);

  1001.         return -1;

  1002.     }

  1003.     if (vorbis_parse_setup_hdr(vc)) {

  1004.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1005.         vorbis_free(vc);

  1006.         return -1;

  1007.     }

  1008. 

  1009.     if (vc->audio_channels > 8)

  1010.         avccontext->channel_layout = 0;

  1011.     else

  1012.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1013. 

  1014.     avccontext->channels    = vc->audio_channels;

  1015.     avccontext->sample_rate = vc->audio_samplerate;

  1016.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;

  1017.     avccontext->sample_fmt  = AV_SAMPLE_FMT_S16;

  1018. 

  1019.     return 0 ;

  1020. }

  1021. 

  1022. // Decode audiopackets -------------------------------------------------

  1023. 

  1024. // Read and decode floor

  1025. 

  1026. static int vorbis_floor0_decode(vorbis_context *vc,

  1027.                                 vorbis_floor_data *vfu, float *vec)

  1028. {

  1029.     vorbis_floor0 *vf = &vfu->t0;

  1030.     float *lsp = vf->lsp;

  1031.     uint_fast32_t amplitude;

  1032.     uint_fast32_t book_idx;

  1033.     uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;

  1034. 

  1035.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1036.     if (amplitude > 0) {

  1037.         float last = 0;

  1038.         uint_fast16_t lsp_len = 0;

  1039.         uint_fast16_t idx;

  1040.         vorbis_codebook codebook;

  1041. 

  1042.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1043.         if (book_idx >= vf->num_books) {

  1044.             av_log(vc->avccontext, AV_LOG_ERROR,

  1045.                     "floor0 dec: booknumber too high!\n");

  1046.             book_idx =  0;

  1047.         }

  1048.         AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);

  1049.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1050.         /* Invalid codebook! */

  1051.         if (!codebook.codevectors)

  1052.             return -1;

  1053. 

  1054.         while (lsp_len<vf->order) {

  1055.             int vec_off;

  1056. 

  1057.             AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);

  1058.             AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1059.             /* read temp vector */

  1060.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1061.                                codebook.nb_bits, codebook.maxdepth)

  1062.                       * codebook.dimensions;

  1063.             AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);

  1064.             /* copy each vector component and add last to it */

  1065.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1066.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1067.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1068. 

  1069.             lsp_len += codebook.dimensions;

  1070.         }

  1071. #ifdef V_DEBUG

  1072.         /* DEBUG: output lsp coeffs */

  1073.         {

  1074.             int idx;

  1075.             for (idx = 0; idx < lsp_len; ++idx)

  1076.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1077.         }

  1078. #endif

  1079. 

  1080.         /* synthesize floor output vector */

  1081.         {

  1082.             int i;

  1083.             int order = vf->order;

  1084.             float wstep = M_PI / vf->bark_map_size;

  1085. 

  1086.             for (i = 0; i < order; i++)

  1087.                 lsp[i] = 2.0f * cos(lsp[i]);

  1088. 

  1089.             AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",

  1090.                      vf->map_size, order, wstep);

  1091. 

  1092.             i = 0;

  1093.             while (i < vf->map_size[blockflag]) {

  1094.                 int j, iter_cond = vf->map[blockflag][i];

  1095.                 float p = 0.5f;

  1096.                 float q = 0.5f;

  1097.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1098. 

  1099.                 /* similar part for the q and p products */

  1100.                 for (j = 0; j + 1 < order; j += 2) {

  1101.                     q *= lsp[j]     - two_cos_w;

  1102.                     p *= lsp[j + 1] - two_cos_w;

  1103.                 }

  1104.                 if (j == order) { // even order

  1105.                     p *= p * (2.0f - two_cos_w);

  1106.                     q *= q * (2.0f + two_cos_w);

  1107.                 } else { // odd order

  1108.                     q *= two_cos_w-lsp[j]; // one more time for q

  1109. 

  1110.                     /* final step and square */

  1111.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1112.                     q *= q;

  1113.                 }

  1114. 

  1115.                 /* calculate linear floor value */

  1116.                 q = exp((((amplitude*vf->amplitude_offset) /

  1117.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1118.                          - vf->amplitude_offset) * .11512925f);

  1119. 

  1120.                 /* fill vector */

  1121.                 do {

  1122.                     vec[i] = q; ++i;

  1123.                 } while (vf->map[blockflag][i] == iter_cond);

  1124.             }

  1125.         }

  1126.     } else {

  1127.         /* this channel is unused */

  1128.         return 1;

  1129.     }

  1130. 

  1131.     AV_DEBUG(" Floor0 decoded\n");

  1132. 

  1133.     return 0;

  1134. }

  1135. 

  1136. static int vorbis_floor1_decode(vorbis_context *vc,

  1137.                                 vorbis_floor_data *vfu, float *vec)

  1138. {

  1139.     vorbis_floor1 *vf = &vfu->t1;

  1140.     GetBitContext *gb = &vc->gb;

  1141.     uint_fast16_t range_v[4] = { 256, 128, 86, 64 };

  1142.     uint_fast16_t range = range_v[vf->multiplier-1];

  1143.     uint_fast16_t floor1_Y[258];

  1144.     uint_fast16_t floor1_Y_final[258];

  1145.     int floor1_flag[258];

  1146.     uint_fast8_t class;

  1147.     uint_fast8_t cdim;

  1148.     uint_fast8_t cbits;

  1149.     uint_fast8_t csub;

  1150.     uint_fast8_t cval;

  1151.     int_fast16_t book;

  1152.     uint_fast16_t offset;

  1153.     uint_fast16_t i,j;

  1154.     int_fast16_t adx, ady, dy, off, predicted;

  1155.     int_fast32_t err;

  1156. 

  1157. 

  1158.     if (!get_bits1(gb)) // silence

  1159.         return 1;

  1160. 

  1161. // Read values (or differences) for the floor's points

  1162. 

  1163.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1164.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1165. 

  1166.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1167. 

  1168.     offset = 2;

  1169.     for (i = 0; i < vf->partitions; ++i) {

  1170.         class = vf->partition_class[i];

  1171.         cdim   = vf->class_dimensions[class];

  1172.         cbits  = vf->class_subclasses[class];

  1173.         csub = (1 << cbits) - 1;

  1174.         cval = 0;

  1175. 

  1176.         AV_DEBUG("Cbits %d \n", cbits);

  1177. 

  1178.         if (cbits) // this reads all subclasses for this partition's class

  1179.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,

  1180.                             vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);

  1181. 

  1182.         for (j = 0; j < cdim; ++j) {

  1183.             book = vf->subclass_books[class][cval & csub];

  1184. 

  1185.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1186. 

  1187.             cval = cval >> cbits;

  1188.             if (book > -1) {

  1189.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1190.                 vc->codebooks[book].nb_bits, 3);

  1191.             } else {

  1192.                 floor1_Y[offset+j] = 0;

  1193.             }

  1194. 

  1195.             AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);

  1196.         }

  1197.         offset+=cdim;

  1198.     }

  1199. 

  1200. // Amplitude calculation from the differences

  1201. 

  1202.     floor1_flag[0] = 1;

  1203.     floor1_flag[1] = 1;

  1204.     floor1_Y_final[0] = floor1_Y[0];

  1205.     floor1_Y_final[1] = floor1_Y[1];

  1206. 

  1207.     for (i = 2; i < vf->x_list_dim; ++i) {

  1208.         uint_fast16_t val, highroom, lowroom, room;

  1209.         uint_fast16_t high_neigh_offs;

  1210.         uint_fast16_t low_neigh_offs;

  1211. 

  1212.         low_neigh_offs  = vf->list[i].low;

  1213.         high_neigh_offs = vf->list[i].high;

  1214.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1215.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1216.         ady = FFABS(dy);

  1217.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1218.         off = err / adx;

  1219.         if (dy < 0) {

  1220.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1221.         } else {

  1222.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1223.         } // render_point end

  1224. 

  1225.         val = floor1_Y[i];

  1226.         highroom = range-predicted;

  1227.         lowroom  = predicted;

  1228.         if (highroom < lowroom) {

  1229.             room = highroom * 2;

  1230.         } else {

  1231.             room = lowroom * 2;   // SPEC mispelling

  1232.         }

  1233.         if (val) {

  1234.             floor1_flag[low_neigh_offs]  = 1;

  1235.             floor1_flag[high_neigh_offs] = 1;

  1236.             floor1_flag[i]               = 1;

  1237.             if (val >= room) {

  1238.                 if (highroom > lowroom) {

  1239.                     floor1_Y_final[i] = val - lowroom + predicted;

  1240.                 } else {

  1241.                     floor1_Y_final[i] = predicted - val + highroom - 1;

  1242.                 }

  1243.             } else {

  1244.                 if (val & 1) {

  1245.                     floor1_Y_final[i] = predicted - (val + 1) / 2;

  1246.                 } else {

  1247.                     floor1_Y_final[i] = predicted + val / 2;

  1248.                 }

  1249.             }

  1250.         } else {

  1251.             floor1_flag[i]    = 0;

  1252.             floor1_Y_final[i] = predicted;

  1253.         }

  1254. 

  1255.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);

  1256.     }

  1257. 

  1258. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1259. 

  1260.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1261. 

  1262.     AV_DEBUG(" Floor decoded\n");

  1263. 

  1264.     return 0;

  1265. }

  1266. 

  1267. // Read and decode residue

  1268. 

  1269. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1270.                                                            vorbis_residue *vr,

  1271.                                                            uint_fast8_t ch,

  1272.                                                            uint_fast8_t *do_not_decode,

  1273.                                                            float *vec,

  1274.                                                            uint_fast16_t vlen,

  1275.                                                            int vr_type)

  1276. {

  1277.     GetBitContext *gb = &vc->gb;

  1278.     uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;

  1279.     uint_fast16_t ptns_to_read = vr->ptns_to_read;

  1280.     uint8_t *classifs = vr->classifs;

  1281.     uint_fast8_t pass;

  1282.     uint_fast8_t ch_used;

  1283.     uint_fast8_t i,j,l;

  1284.     uint_fast16_t k;

  1285. 

  1286.     if (vr_type == 2) {

  1287.         for (j = 1; j < ch; ++j)

  1288.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1289.         if (do_not_decode[0])

  1290.             return 0;

  1291.         ch_used = 1;

  1292.     } else {

  1293.         ch_used = ch;

  1294.     }

  1295. 

  1296.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1297. 

  1298.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1299.         uint_fast16_t voffset;

  1300.         uint_fast16_t partition_count;

  1301.         uint_fast16_t j_times_ptns_to_read;

  1302. 

  1303.         voffset = vr->begin;

  1304.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1305.             if (!pass) {

  1306.                 uint_fast32_t inverse_class = ff_inverse[vr->classifications];

  1307.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1308.                     if (!do_not_decode[j]) {

  1309.                         uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1310.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1311. 

  1312.                         AV_DEBUG("Classword: %d \n", temp);

  1313. 

  1314.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1315.                         for (i = 0; i < c_p_c; ++i) {

  1316.                             uint_fast32_t temp2;

  1317. 

  1318.                             temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;

  1319.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1320.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1321.                             temp = temp2;

  1322.                         }

  1323.                     }

  1324.                     j_times_ptns_to_read += ptns_to_read;

  1325.                 }

  1326.             }

  1327.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1328.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1329.                     uint_fast16_t voffs;

  1330. 

  1331.                     if (!do_not_decode[j]) {

  1332.                         uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];

  1333.                         int_fast16_t vqbook = vr->books[vqclass][pass];

  1334. 

  1335.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1336.                             uint_fast16_t coffs;

  1337.                             unsigned dim =  vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64

  1338.                             uint_fast16_t step = dim == 1 ? vr->partition_size

  1339.                                                           : FASTDIV(vr->partition_size, dim);

  1340.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1341. 

  1342.                             if (vr_type == 0) {

  1343. 

  1344.                                 voffs = voffset+j*vlen;

  1345.                                 for (k = 0; k < step; ++k) {

  1346.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1347.                                     for (l = 0; l < dim; ++l)

  1348.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH

  1349.                                 }

  1350.                             } else if (vr_type == 1) {

  1351.                                 voffs = voffset + j * vlen;

  1352.                                 for (k = 0; k < step; ++k) {

  1353.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1354.                                     for (l = 0; l < dim; ++l, ++voffs) {

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

  1356. 

  1357.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1358.                                     }

  1359.                                 }

  1360.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1361.                                 voffs = voffset >> 1;

  1362. 

  1363.                                 if (dim == 2) {

  1364.                                     for (k = 0; k < step; ++k) {

  1365.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1366.                                         vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH

  1367.                                         vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH

  1368.                                     }

  1369.                                 } else if (dim == 4) {

  1370.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1371.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1372.                                         vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH

  1373.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH

  1374.                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH

  1375.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH

  1376.                                     }

  1377.                                 } else

  1378.                                 for (k = 0; k < step; ++k) {

  1379.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1380.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1381.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH

  1382.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH

  1383. 

  1384.                                         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);

  1385.                                     }

  1386.                                 }

  1387. 

  1388.                             } else if (vr_type == 2) {

  1389.                                 voffs = voffset;

  1390. 

  1391.                                 for (k = 0; k < step; ++k) {

  1392.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1393.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1394.                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %

  1395. 

  1396.                                         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);

  1397.                                     }

  1398.                                 }

  1399.                             }

  1400.                         }

  1401.                     }

  1402.                     j_times_ptns_to_read += ptns_to_read;

  1403.                 }

  1404.                 ++partition_count;

  1405.                 voffset += vr->partition_size;

  1406.             }

  1407.         }

  1408.     }

  1409.     return 0;

  1410. }

  1411. 

  1412. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1413.                                         uint_fast8_t ch,

  1414.                                         uint_fast8_t *do_not_decode,

  1415.                                         float *vec, uint_fast16_t vlen)

  1416. {

  1417.     if (vr->type == 2)

  1418.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1419.     else if (vr->type == 1)

  1420.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1421.     else if (vr->type == 0)

  1422.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1423.     else {

  1424.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1425.         return -1;

  1426.     }

  1427. }

  1428. 

  1429. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1430. {

  1431.     int i;

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

  1433.         if (mag[i] > 0.0) {

  1434.             if (ang[i] > 0.0) {

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

  1436.             } else {

  1437.                 float temp = ang[i];

  1438.                 ang[i]     = mag[i];

  1439.                 mag[i]    += temp;

  1440.             }

  1441.         } else {

  1442.             if (ang[i] > 0.0) {

  1443.                 ang[i] += mag[i];

  1444.             } else {

  1445.                 float temp = ang[i];

  1446.                 ang[i]     = mag[i];

  1447.                 mag[i]    -= temp;

  1448.             }

  1449.         }

  1450.     }

  1451. }

  1452. 

  1453. // Decode the audio packet using the functions above

  1454. 

  1455. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1456. {

  1457.     GetBitContext *gb = &vc->gb;

  1458.     FFTContext *mdct;

  1459.     uint_fast8_t previous_window = vc->previous_window;

  1460.     uint_fast8_t mode_number;

  1461.     uint_fast8_t blockflag;

  1462.     uint_fast16_t blocksize;

  1463.     int_fast32_t i,j;

  1464.     uint_fast8_t no_residue[255];

  1465.     uint_fast8_t do_not_decode[255];

  1466.     vorbis_mapping *mapping;

  1467.     float *ch_res_ptr   = vc->channel_residues;

  1468.     float *ch_floor_ptr = vc->channel_floors;

  1469.     uint_fast8_t res_chan[255];

  1470.     uint_fast8_t res_num = 0;

  1471.     int_fast16_t retlen  = 0;

  1472. 

  1473.     if (get_bits1(gb)) {

  1474.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1475.         return -1; // packet type not audio

  1476.     }

  1477. 

  1478.     if (vc->mode_count == 1) {

  1479.         mode_number = 0;

  1480.     } else {

  1481.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1482.     }

  1483.     vc->mode_number = mode_number;

  1484.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1485. 

  1486.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1487. 

  1488.     blockflag = vc->modes[mode_number].blockflag;

  1489.     blocksize = vc->blocksize[blockflag];

  1490.     if (blockflag)

  1491.         skip_bits(gb, 2); // previous_window, next_window

  1492. 

  1493.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1494.     memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1495. 

  1496. // Decode floor

  1497. 

  1498.     for (i = 0; i < vc->audio_channels; ++i) {

  1499.         vorbis_floor *floor;

  1500.         int ret;

  1501.         if (mapping->submaps > 1) {

  1502.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1503.         } else {

  1504.             floor = &vc->floors[mapping->submap_floor[0]];

  1505.         }

  1506. 

  1507.         ret = floor->decode(vc, &floor->data, ch_floor_ptr);

  1508. 

  1509.         if (ret < 0) {

  1510.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1511.             return -1;

  1512.         }

  1513.         no_residue[i] = ret;

  1514.         ch_floor_ptr += blocksize / 2;

  1515.     }

  1516. 

  1517. // Nonzero vector propagate

  1518. 

  1519.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1520.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1521.             no_residue[mapping->magnitude[i]] = 0;

  1522.             no_residue[mapping->angle[i]]     = 0;

  1523.         }

  1524.     }

  1525. 

  1526. // Decode residue

  1527. 

  1528.     for (i = 0; i < mapping->submaps; ++i) {

  1529.         vorbis_residue *residue;

  1530.         uint_fast8_t ch = 0;

  1531. 

  1532.         for (j = 0; j < vc->audio_channels; ++j) {

  1533.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1534.                 res_chan[j] = res_num;

  1535.                 if (no_residue[j]) {

  1536.                     do_not_decode[ch] = 1;

  1537.                 } else {

  1538.                     do_not_decode[ch] = 0;

  1539.                 }

  1540.                 ++ch;

  1541.                 ++res_num;

  1542.             }

  1543.         }

  1544.         residue = &vc->residues[mapping->submap_residue[i]];

  1545.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1546. 

  1547.         ch_res_ptr += ch * blocksize / 2;

  1548.     }

  1549. 

  1550. // Inverse coupling

  1551. 

  1552.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1553.         float *mag, *ang;

  1554. 

  1555.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

  1556.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1557.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1558.     }

  1559. 

  1560. // Dotproduct, MDCT

  1561. 

  1562.     mdct = &vc->mdct[blockflag];

  1563. 

  1564.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1565.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;

  1566.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1567.         vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);

  1568.         mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);

  1569.     }

  1570. 

  1571. // Overlap/add, save data for next overlapping  FPMATH

  1572. 

  1573.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

  1574.     for (j = 0; j < vc->audio_channels; j++) {

  1575.         uint_fast16_t bs0 = vc->blocksize[0];

  1576.         uint_fast16_t bs1 = vc->blocksize[1];

  1577.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1578.         float *saved      = vc->saved + j * bs1 / 4;

  1579.         float *ret        = vc->channel_floors + j * retlen;

  1580.         float *buf        = residue;

  1581.         const float *win  = vc->win[blockflag & previous_window];

  1582. 

  1583.         if (blockflag == previous_window) {

  1584.             vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);

  1585.         } else if (blockflag > previous_window) {

  1586.             vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);

  1587.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1588.         } else {

  1589.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1590.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);

  1591.         }

  1592.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1593.     }

  1594. 

  1595.     vc->previous_window = blockflag;

  1596.     return retlen;

  1597. }

  1598. 

  1599. // Return the decoded audio packet through the standard api

  1600. 

  1601. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1602.                                void *data, int *data_size,

  1603.                                AVPacket *avpkt)

  1604. {

  1605.     const uint8_t *buf = avpkt->data;

  1606.     int buf_size       = avpkt->size;

  1607.     vorbis_context *vc = avccontext->priv_data ;

  1608.     GetBitContext *gb = &(vc->gb);

  1609.     const float *channel_ptrs[255];

  1610.     int i;

  1611. 

  1612.     int_fast16_t len;

  1613. 

  1614.     if (!buf_size)

  1615.         return 0;

  1616. 

  1617.     AV_DEBUG("packet length %d \n", buf_size);

  1618. 

  1619.     init_get_bits(gb, buf, buf_size*8);

  1620. 

  1621.     len = vorbis_parse_audio_packet(vc);

  1622. 

  1623.     if (len <= 0) {

  1624.         *data_size = 0;

  1625.         return buf_size;

  1626.     }

  1627. 

  1628.     if (!vc->first_frame) {

  1629.         vc->first_frame = 1;

  1630.         *data_size = 0;

  1631.         return buf_size ;

  1632.     }

  1633. 

  1634.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1635. 

  1636.     if (vc->audio_channels > 8) {

  1637.         for (i = 0; i < vc->audio_channels; i++)

  1638.             channel_ptrs[i] = vc->channel_floors + i * len;

  1639.     } else {

  1640.         for (i = 0; i < vc->audio_channels; i++)

  1641.             channel_ptrs[i] = vc->channel_floors +

  1642.                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1643.     }

  1644. 

  1645.     vc->fmt_conv.float_to_int16_interleave(data, channel_ptrs, len,

  1646.                                            vc->audio_channels);

  1647.     *data_size = len * 2 * vc->audio_channels;

  1648. 

  1649.     return buf_size ;

  1650. }

  1651. 

  1652. // Close decoder

  1653. 

  1654. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1655. {

  1656.     vorbis_context *vc = avccontext->priv_data;

  1657. 

  1658.     vorbis_free(vc);

  1659. 

  1660.     return 0 ;

  1661. }

  1662. 

  1663. AVCodec ff_vorbis_decoder = {

  1664.     "vorbis",

  1665.     AVMEDIA_TYPE_AUDIO,

  1666.     CODEC_ID_VORBIS,

  1667.     sizeof(vorbis_context),

  1668.     vorbis_decode_init,

  1669.     NULL,

  1670.     vorbis_decode_close,

  1671.     vorbis_decode_frame,

  1672.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1673.     .channel_layouts = ff_vorbis_channel_layouts,

  1674. };