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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. int (* 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.             uint8_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.     unsigned      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.     uint8_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.     float         scale_bias; // for float->int conversion

  157. } vorbis_context;

  158. 

  159. /* Helper functions */

  160. 

  161. #define BARK(x) \

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

  163. 

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

  165. #define VALIDATE_INDEX(idx, limit) \

  166.     if (idx >= limit) {\

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

  168.                idx_err_str,\

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

  170.         return -1;\

  171.     }

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

  173.     {\

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

  175.         VALIDATE_INDEX(idx, limit)\

  176.     }

  177. 

  178. static float vorbisfloat2float(uint_fast32_t val)

  179. {

  180.     double mant = val & 0x1fffff;

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

  182.     if (val & 0x80000000)

  183.         mant = -mant;

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

  185. }

  186. 

  187. 

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

  189. 

  190. static void vorbis_free(vorbis_context *vc)

  191. {

  192.     int_fast16_t i;

  193. 

  194.     av_freep(&vc->channel_residues);

  195.     av_freep(&vc->channel_floors);

  196.     av_freep(&vc->saved);

  197. 

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

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

  200.     av_freep(&vc->residues);

  201.     av_freep(&vc->modes);

  202. 

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

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

  205. 

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

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

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

  209.     }

  210.     av_freep(&vc->codebooks);

  211. 

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

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

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

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

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

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

  218.         } else {

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

  220.         }

  221.     }

  222.     av_freep(&vc->floors);

  223. 

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

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

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

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

  228.     }

  229.     av_freep(&vc->mappings);

  230. }

  231. 

  232. // Parse setup header -------------------------------------------------

  233. 

  234. // Process codebooks part

  235. 

  236. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  237. {

  238.     uint_fast16_t cb;

  239.     uint8_t  *tmp_vlc_bits;

  240.     uint32_t *tmp_vlc_codes;

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

  242.     uint_fast16_t *codebook_multiplicands;

  243. 

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

  245. 

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

  247. 

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

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

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

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

  252. 

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

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

  255.         uint_fast8_t ordered;

  256.         uint_fast32_t t, used_entries = 0;

  257.         uint_fast32_t entries;

  258. 

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

  260. 

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

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

  263.             goto error;

  264.         }

  265. 

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

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

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

  269.             goto error;

  270.         }

  271.         entries = get_bits(gb, 24);

  272.         if (entries > V_MAX_VLCS) {

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

  274.             goto error;

  275.         }

  276. 

  277.         ordered = get_bits1(gb);

  278. 

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

  280. 

  281.         if (!ordered) {

  282.             uint_fast16_t ce;

  283.             uint_fast8_t  flag;

  284.             uint_fast8_t  sparse = get_bits1(gb);

  285. 

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

  287. 

  288.             if (sparse) {

  289.                 AV_DEBUG(" sparse \n");

  290. 

  291.                 used_entries = 0;

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

  293.                     flag = get_bits1(gb);

  294.                     if (flag) {

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

  296.                         ++used_entries;

  297.                     } else

  298.                         tmp_vlc_bits[ce] = 0;

  299.                 }

  300.             } else {

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

  302. 

  303.                 used_entries = entries;

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

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

  306.             }

  307.         } else {

  308.             uint_fast16_t current_entry = 0;

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

  310. 

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

  312. 

  313.             used_entries = entries;

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

  315.                 uint_fast16_t i, number;

  316. 

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

  318. 

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

  320. 

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

  322. 

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

  324.                     if (i < used_entries)

  325.                         tmp_vlc_bits[i] = current_length;

  326. 

  327.                 current_entry+=number;

  328.             }

  329.             if (current_entry>used_entries) {

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

  331.                 goto error;

  332.             }

  333.         }

  334. 

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

  336. 

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

  338. 

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

  340. 

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

  342.             uint_fast16_t i, j, k;

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

  344. 

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

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

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

  348.             uint_fast8_t codebook_sequence_p = get_bits1(gb);

  349. 

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

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

  352. 

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

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

  355. 

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

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

  358.             }

  359. 

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

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

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

  363.                 uint_fast8_t dim = codebook_setup->dimensions;

  364. 

  365.                 if (tmp_vlc_bits[i]) {

  366.                     float last = 0.0;

  367.                     uint_fast32_t lookup_offset = i;

  368. 

  369. #ifdef V_DEBUG

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

  371. #endif

  372. 

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

  374.                         uint_fast32_t multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  376.                         if (codebook_sequence_p)

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

  378.                         lookup_offset/=codebook_lookup_values;

  379.                     }

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

  381. 

  382. #ifdef V_DEBUG

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

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

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

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

  387. #endif

  388. 

  389.                     ++j;

  390.                 }

  391.             }

  392.             if (j != used_entries) {

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

  394.                 goto error;

  395.             }

  396.             entries = used_entries;

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

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

  399.             goto error;

  400.         }

  401. 

  402. // Initialize VLC table

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

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

  405.             goto error;

  406.         }

  407.         codebook_setup->maxdepth = 0;

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

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

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

  411. 

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

  413.             codebook_setup->nb_bits = V_NB_BITS2;

  414.         else

  415.             codebook_setup->nb_bits = V_NB_BITS;

  416. 

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

  418. 

  419.         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)) {

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

  421.             goto error;

  422.         }

  423.     }

  424. 

  425.     av_free(tmp_vlc_bits);

  426.     av_free(tmp_vlc_codes);

  427.     av_free(codebook_multiplicands);

  428.     return 0;

  429. 

  430. // Error:

  431. error:

  432.     av_free(tmp_vlc_bits);

  433.     av_free(tmp_vlc_codes);

  434.     av_free(codebook_multiplicands);

  435.     return -1;

  436. }

  437. 

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

  439. 

  440. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  441. {

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

  443.     uint_fast8_t i;

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

  445. 

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

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

  448. 

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

  450. 

  451.         if (vorbis_tdtransform) {

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

  453.             return -1;

  454.         }

  455.     }

  456.     return 0;

  457. }

  458. 

  459. // Process floors part

  460. 

  461. static int vorbis_floor0_decode(vorbis_context *vc,

  462.                                 vorbis_floor_data *vfu, float *vec);

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

  464. static int vorbis_floor1_decode(vorbis_context *vc,

  465.                                 vorbis_floor_data *vfu, float *vec);

  466. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  467. {

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

  469.     int i,j,k;

  470. 

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

  472. 

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

  474. 

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

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

  477. 

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

  479. 

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

  481. 

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

  483.             int maximum_class = -1;

  484.             uint_fast8_t  rangebits;

  485.             uint_fast32_t rangemax;

  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.             rangemax = (1 << rangebits);

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

  539.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

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

  542.                 return -1;

  543.             }

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

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

  546. 

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

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

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

  550. 

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

  552.                 }

  553.             }

  554. 

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

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

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

  558.             uint_fast8_t max_codebook_dim = 0;

  559. 

  560.             floor_setup->decode = vorbis_floor0_decode;

  561. 

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

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

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

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

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

  567.              * 2^0 - 1 == 0                             */

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

  569.               av_log(vc->avccontext, AV_LOG_ERROR,

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

  571.               return -1;

  572.             }

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

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

  575. 

  576.             /* allocate mem for booklist */

  577.             floor_setup->data.t0.book_list =

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

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

  580.                 return -1;

  581.             /* read book indexes */

  582.             {

  583.                 int idx;

  584.                 uint_fast8_t book_idx;

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

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

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

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

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

  590.                 }

  591.             }

  592. 

  593.             create_map(vc, i);

  594. 

  595.             /* allocate mem for lsp coefficients */

  596.             {

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

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

  599.                 floor_setup->data.t0.lsp =

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

  601.                               * sizeof(float));

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

  603.                     return -1;

  604.             }

  605. 

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

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

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

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

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

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

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

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

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

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

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

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

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

  619.             {

  620.               int idx;

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

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

  623.                            idx+1,

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

  625.               }

  626.             }

  627. #endif

  628.         } else {

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

  630.             return -1;

  631.         }

  632.     }

  633.     return 0;

  634. }

  635. 

  636. // Process residues part

  637. 

  638. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  639. {

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

  641.     uint_fast8_t i, j, k;

  642. 

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

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

  645. 

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

  647. 

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

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

  650.         uint_fast8_t cascade[64];

  651.         uint_fast8_t high_bits;

  652.         uint_fast8_t low_bits;

  653. 

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

  655. 

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

  657. 

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

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

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

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

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

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

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

  665.             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);

  666.             return -1;

  667.         }

  668. 

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

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

  671. 

  672.         res_setup->ptns_to_read =

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

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

  675.                                         vc->audio_channels *

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

  677.         if (!res_setup->classifs)

  678.             return AVERROR(ENOMEM);

  679. 

  680.         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,

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

  682. 

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

  684.             high_bits = 0;

  685.             low_bits  = get_bits(gb, 3);

  686.             if (get_bits1(gb))

  687.                 high_bits = get_bits(gb, 5);

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

  689. 

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

  691.         }

  692. 

  693.         res_setup->maxpass = 0;

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

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

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

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

  698. 

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

  700. 

  701.                     if (k>res_setup->maxpass)

  702.                         res_setup->maxpass = k;

  703.                 } else {

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

  705.                 }

  706.             }

  707.         }

  708.     }

  709.     return 0;

  710. }

  711. 

  712. // Process mappings part

  713. 

  714. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  715. {

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

  717.     uint_fast8_t i, j;

  718. 

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

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

  721. 

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

  723. 

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

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

  726. 

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

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

  729.             return -1;

  730.         }

  731.         if (get_bits1(gb)) {

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

  733.         } else {

  734.             mapping_setup->submaps = 1;

  735.         }

  736. 

  737.         if (get_bits1(gb)) {

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

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

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

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

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

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

  744.             }

  745.         } else {

  746.             mapping_setup->coupling_steps = 0;

  747.         }

  748. 

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

  750. 

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

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

  753.             return -1; // following spec.

  754.         }

  755. 

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

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

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

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

  760.         }

  761. 

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

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

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

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

  766. 

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

  768.         }

  769.     }

  770.     return 0;

  771. }

  772. 

  773. // Process modes part

  774. 

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

  776. {

  777.     vorbis_floor *floors = vc->floors;

  778.     vorbis_floor0 *vf;

  779.     int idx;

  780.     int_fast8_t blockflag;

  781.     int_fast32_t *map;

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

  783. 

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

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

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

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

  788. 

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

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

  791. 

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

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

  794.                              ((vf->bark_map_size) /

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

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

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

  798.         }

  799.         map[n] = -1;

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

  801.     }

  802. 

  803. #   ifdef V_DEBUG

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

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

  806.                  idx, map[idx]);

  807.     }

  808. #   endif

  809. }

  810. 

  811. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  812. {

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

  814.     uint_fast8_t i;

  815. 

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

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

  818. 

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

  820. 

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

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

  823. 

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

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

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

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

  828. 

  829.         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);

  830.     }

  831.     return 0;

  832. }

  833. 

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

  835. 

  836. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  837. {

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

  839. 

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

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

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

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

  844.         return -1;

  845.     }

  846. 

  847.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  849.         return -2;

  850.     }

  851.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  853.         return -3;

  854.     }

  855.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  857.         return -4;

  858.     }

  859.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  861.         return -5;

  862.     }

  863.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  865.         return -6;

  866.     }

  867.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  869.         return -7;

  870.     }

  871.     if (!get_bits1(gb)) {

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

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

  874.     }

  875. 

  876.     return 0;

  877. }

  878. 

  879. // Process the identification header

  880. 

  881. static int vorbis_parse_id_hdr(vorbis_context *vc)

  882. {

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

  884.     uint_fast8_t bl0, bl1;

  885. 

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

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

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

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

  890.         return -1;

  891.     }

  892. 

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

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

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

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

  897.         return -1;

  898.     }

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

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

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

  902.         return -1;

  903.     }

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

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

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

  907.     bl0 = get_bits(gb, 4);

  908.     bl1 = get_bits(gb, 4);

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

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

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

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

  913.         return -3;

  914.     }

  915.     // output format int16

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

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

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

  919.         return -4;

  920.     }

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

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

  923. 

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

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

  926.         return -2;

  927.     }

  928. 

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

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

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

  932.     vc->previous_window  = 0;

  933. 

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

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

  936. 

  937.     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 ",

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

  939. 

  940. /*

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

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

  943.         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)));

  944.     }

  945. */

  946. 

  947.     return 0;

  948. }

  949. 

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

  951. 

  952. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  953. {

  954.     vorbis_context *vc = avccontext->priv_data ;

  955.     uint8_t *headers   = avccontext->extradata;

  956.     int headers_len    = avccontext->extradata_size;

  957.     uint8_t *header_start[3];

  958.     int header_len[3];

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

  960.     int hdr_type;

  961. 

  962.     vc->avccontext = avccontext;

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

  964. 

  965.     vc->scale_bias = 32768.0f;

  966. 

  967.     if (!headers_len) {

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

  969.         return -1;

  970.     }

  971. 

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

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

  974.         return -1;

  975.     }

  976. 

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

  978.     hdr_type = get_bits(gb, 8);

  979.     if (hdr_type != 1) {

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

  981.         return -1;

  982.     }

  983.     if (vorbis_parse_id_hdr(vc)) {

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

  985.         vorbis_free(vc);

  986.         return -1;

  987.     }

  988. 

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

  990.     hdr_type = get_bits(gb, 8);

  991.     if (hdr_type != 5) {

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

  993.         vorbis_free(vc);

  994.         return -1;

  995.     }

  996.     if (vorbis_parse_setup_hdr(vc)) {

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

  998.         vorbis_free(vc);

  999.         return -1;

  1000.     }

  1001. 

  1002.     if (vc->audio_channels > 8)

  1003.         avccontext->channel_layout = 0;

  1004.     else

  1005.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1006. 

  1007.     avccontext->channels    = vc->audio_channels;

  1008.     avccontext->sample_rate = vc->audio_samplerate;

  1009.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;

  1010.     avccontext->sample_fmt  = AV_SAMPLE_FMT_S16;

  1011. 

  1012.     return 0 ;

  1013. }

  1014. 

  1015. // Decode audiopackets -------------------------------------------------

  1016. 

  1017. // Read and decode floor

  1018. 

  1019. static int vorbis_floor0_decode(vorbis_context *vc,

  1020.                                 vorbis_floor_data *vfu, float *vec)

  1021. {

  1022.     vorbis_floor0 *vf = &vfu->t0;

  1023.     float *lsp = vf->lsp;

  1024.     uint_fast32_t amplitude;

  1025.     uint_fast32_t book_idx;

  1026.     uint_fast8_t blockflag = vc->modes[vc->mode_number].blockflag;

  1027. 

  1028.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1029.     if (amplitude > 0) {

  1030.         float last = 0;

  1031.         uint_fast16_t lsp_len = 0;

  1032.         uint_fast16_t idx;

  1033.         vorbis_codebook codebook;

  1034. 

  1035.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1036.         if (book_idx >= vf->num_books) {

  1037.             av_log(vc->avccontext, AV_LOG_ERROR,

  1038.                     "floor0 dec: booknumber too high!\n");

  1039.             book_idx =  0;

  1040.             //FIXME: look above

  1041.         }

  1042.         AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);

  1043.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1044.         /* Invalid codebook! */

  1045.         if (!codebook.codevectors)

  1046.             return -1;

  1047. 

  1048.         while (lsp_len<vf->order) {

  1049.             int vec_off;

  1050. 

  1051.             AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);

  1052.             AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1053.             /* read temp vector */

  1054.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1055.                                codebook.nb_bits, codebook.maxdepth)

  1056.                       * codebook.dimensions;

  1057.             AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);

  1058.             /* copy each vector component and add last to it */

  1059.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1060.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1061.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1062. 

  1063.             lsp_len += codebook.dimensions;

  1064.         }

  1065. #ifdef V_DEBUG

  1066.         /* DEBUG: output lsp coeffs */

  1067.         {

  1068.             int idx;

  1069.             for (idx = 0; idx < lsp_len; ++idx)

  1070.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1071.         }

  1072. #endif

  1073. 

  1074.         /* synthesize floor output vector */

  1075.         {

  1076.             int i;

  1077.             int order = vf->order;

  1078.             float wstep = M_PI / vf->bark_map_size;

  1079. 

  1080.             for (i = 0; i < order; i++)

  1081.                 lsp[i] = 2.0f * cos(lsp[i]);

  1082. 

  1083.             AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",

  1084.                      vf->map_size, order, wstep);

  1085. 

  1086.             i = 0;

  1087.             while (i < vf->map_size[blockflag]) {

  1088.                 int j, iter_cond = vf->map[blockflag][i];

  1089.                 float p = 0.5f;

  1090.                 float q = 0.5f;

  1091.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1092. 

  1093.                 /* similar part for the q and p products */

  1094.                 for (j = 0; j + 1 < order; j += 2) {

  1095.                     q *= lsp[j]     - two_cos_w;

  1096.                     p *= lsp[j + 1] - two_cos_w;

  1097.                 }

  1098.                 if (j == order) { // even order

  1099.                     p *= p * (2.0f - two_cos_w);

  1100.                     q *= q * (2.0f + two_cos_w);

  1101.                 } else { // odd order

  1102.                     q *= two_cos_w-lsp[j]; // one more time for q

  1103. 

  1104.                     /* final step and square */

  1105.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1106.                     q *= q;

  1107.                 }

  1108. 

  1109.                 /* calculate linear floor value */

  1110.                 {

  1111.                     q = exp((((amplitude*vf->amplitude_offset) /

  1112.                               (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1113.                              - vf->amplitude_offset) * .11512925f);

  1114.                 }

  1115. 

  1116.                 /* fill vector */

  1117.                 do {

  1118.                     vec[i] = q; ++i;

  1119.                 } while (vf->map[blockflag][i] == iter_cond);

  1120.             }

  1121.         }

  1122.     } else {

  1123.         /* this channel is unused */

  1124.         return 1;

  1125.     }

  1126. 

  1127.     AV_DEBUG(" Floor0 decoded\n");

  1128. 

  1129.     return 0;

  1130. }

  1131. 

  1132. static int vorbis_floor1_decode(vorbis_context *vc,

  1133.                                 vorbis_floor_data *vfu, float *vec)

  1134. {

  1135.     vorbis_floor1 *vf = &vfu->t1;

  1136.     GetBitContext *gb = &vc->gb;

  1137.     uint_fast16_t range_v[4] = { 256, 128, 86, 64 };

  1138.     uint_fast16_t range = range_v[vf->multiplier-1];

  1139.     uint_fast16_t floor1_Y[258];

  1140.     uint_fast16_t floor1_Y_final[258];

  1141.     int floor1_flag[258];

  1142.     uint_fast8_t class_;

  1143.     uint_fast8_t cdim;

  1144.     uint_fast8_t cbits;

  1145.     uint_fast8_t csub;

  1146.     uint_fast8_t cval;

  1147.     int_fast16_t book;

  1148.     uint_fast16_t offset;

  1149.     uint_fast16_t i,j;

  1150.     int_fast16_t adx, ady, dy, off, predicted;

  1151.     int_fast32_t err;

  1152. 

  1153. 

  1154.     if (!get_bits1(gb)) // silence

  1155.         return 1;

  1156. 

  1157. // Read values (or differences) for the floor's points

  1158. 

  1159.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1160.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1161. 

  1162.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1163. 

  1164.     offset = 2;

  1165.     for (i = 0; i < vf->partitions; ++i) {

  1166.         class_ = vf->partition_class[i];

  1167.         cdim   = vf->class_dimensions[class_];

  1168.         cbits  = vf->class_subclasses[class_];

  1169.         csub = (1 << cbits) - 1;

  1170.         cval = 0;

  1171. 

  1172.         AV_DEBUG("Cbits %d \n", cbits);

  1173. 

  1174.         if (cbits) // this reads all subclasses for this partition's class

  1175.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class_]].vlc.table,

  1176.                             vc->codebooks[vf->class_masterbook[class_]].nb_bits, 3);

  1177. 

  1178.         for (j = 0; j < cdim; ++j) {

  1179.             book = vf->subclass_books[class_][cval & csub];

  1180. 

  1181.             AV_DEBUG("book %d Cbits %d cval %d  bits:%d \n", book, cbits, cval, get_bits_count(gb));

  1182. 

  1183.             cval = cval >> cbits;

  1184.             if (book > -1) {

  1185.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1186.                 vc->codebooks[book].nb_bits, 3);

  1187.             } else {

  1188.                 floor1_Y[offset+j] = 0;

  1189.             }

  1190. 

  1191.             AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);

  1192.         }

  1193.         offset+=cdim;

  1194.     }

  1195. 

  1196. // Amplitude calculation from the differences

  1197. 

  1198.     floor1_flag[0] = 1;

  1199.     floor1_flag[1] = 1;

  1200.     floor1_Y_final[0] = floor1_Y[0];

  1201.     floor1_Y_final[1] = floor1_Y[1];

  1202. 

  1203.     for (i = 2; i < vf->x_list_dim; ++i) {

  1204.         uint_fast16_t val, highroom, lowroom, room;

  1205.         uint_fast16_t high_neigh_offs;

  1206.         uint_fast16_t low_neigh_offs;

  1207. 

  1208.         low_neigh_offs  = vf->list[i].low;

  1209.         high_neigh_offs = vf->list[i].high;

  1210.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1211.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1212.         ady = FFABS(dy);

  1213.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1214.         off = err / adx;

  1215.         if (dy < 0) {

  1216.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1217.         } else {

  1218.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1219.         } // render_point end

  1220. 

  1221.         val = floor1_Y[i];

  1222.         highroom = range-predicted;

  1223.         lowroom  = predicted;

  1224.         if (highroom < lowroom) {

  1225.             room = highroom * 2;

  1226.         } else {

  1227.             room = lowroom * 2;   // SPEC mispelling

  1228.         }

  1229.         if (val) {

  1230.             floor1_flag[low_neigh_offs]  = 1;

  1231.             floor1_flag[high_neigh_offs] = 1;

  1232.             floor1_flag[i]               = 1;

  1233.             if (val >= room) {

  1234.                 if (highroom > lowroom) {

  1235.                     floor1_Y_final[i] = val - lowroom + predicted;

  1236.                 } else {

  1237.                     floor1_Y_final[i] = predicted - val + highroom - 1;

  1238.                 }

  1239.             } else {

  1240.                 if (val & 1) {

  1241.                     floor1_Y_final[i] = predicted - (val + 1) / 2;

  1242.                 } else {

  1243.                     floor1_Y_final[i] = predicted + val / 2;

  1244.                 }

  1245.             }

  1246.         } else {

  1247.             floor1_flag[i]    = 0;

  1248.             floor1_Y_final[i] = predicted;

  1249.         }

  1250. 

  1251.         AV_DEBUG(" Decoded floor(%d) = %d / val %d \n", vf->list[i].x, floor1_Y_final[i], val);

  1252.     }

  1253. 

  1254. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1255. 

  1256.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1257. 

  1258.     AV_DEBUG(" Floor decoded\n");

  1259. 

  1260.     return 0;

  1261. }

  1262. 

  1263. // Read and decode residue

  1264. 

  1265. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1266.                                                            vorbis_residue *vr,

  1267.                                                            uint_fast8_t ch,

  1268.                                                            uint_fast8_t *do_not_decode,

  1269.                                                            float *vec,

  1270.                                                            uint_fast16_t vlen,

  1271.                                                            int vr_type)

  1272. {

  1273.     GetBitContext *gb = &vc->gb;

  1274.     uint_fast8_t c_p_c = vc->codebooks[vr->classbook].dimensions;

  1275.     uint_fast16_t ptns_to_read = vr->ptns_to_read;

  1276.     uint8_t *classifs = vr->classifs;

  1277.     uint_fast8_t pass;

  1278.     uint_fast8_t ch_used;

  1279.     uint_fast8_t i,j,l;

  1280.     uint_fast16_t k;

  1281. 

  1282.     if (vr_type == 2) {

  1283.         for (j = 1; j < ch; ++j)

  1284.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1285.         if (do_not_decode[0])

  1286.             return 0;

  1287.         ch_used = 1;

  1288.     } else {

  1289.         ch_used = ch;

  1290.     }

  1291. 

  1292.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1293. 

  1294.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1295.         uint_fast16_t voffset;

  1296.         uint_fast16_t partition_count;

  1297.         uint_fast16_t j_times_ptns_to_read;

  1298. 

  1299.         voffset = vr->begin;

  1300.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1301.             if (!pass) {

  1302.                 uint_fast32_t inverse_class = ff_inverse[vr->classifications];

  1303.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1304.                     if (!do_not_decode[j]) {

  1305.                         uint_fast32_t temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1306.                         vc->codebooks[vr->classbook].nb_bits, 3);

  1307. 

  1308.                         AV_DEBUG("Classword: %d \n", temp);

  1309. 

  1310.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1311.                         for (i = 0; i < c_p_c; ++i) {

  1312.                             uint_fast32_t temp2;

  1313. 

  1314.                             temp2 = (((uint_fast64_t)temp) * inverse_class) >> 32;

  1315.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1316.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1317.                             temp = temp2;

  1318.                         }

  1319.                     }

  1320.                     j_times_ptns_to_read += ptns_to_read;

  1321.                 }

  1322.             }

  1323.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1324.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1325.                     uint_fast16_t voffs;

  1326. 

  1327.                     if (!do_not_decode[j]) {

  1328.                         uint_fast8_t vqclass = classifs[j_times_ptns_to_read+partition_count];

  1329.                         int_fast16_t vqbook = vr->books[vqclass][pass];

  1330. 

  1331.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1332.                             uint_fast16_t coffs;

  1333.                             unsigned dim =  vc->codebooks[vqbook].dimensions; // not uint_fast8_t: 64bit is slower here on amd64

  1334.                             uint_fast16_t step = dim == 1 ? vr->partition_size

  1335.                                                           : FASTDIV(vr->partition_size, dim);

  1336.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1337. 

  1338.                             if (vr_type == 0) {

  1339. 

  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)

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

  1345.                                 }

  1346.                             } else if (vr_type == 1) {

  1347.                                 voffs = voffset + j * vlen;

  1348.                                 for (k = 0; k < step; ++k) {

  1349.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1350.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1351.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1352. 

  1353.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d  \n", pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1354.                                     }

  1355.                                 }

  1356.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1357.                                 voffs = voffset >> 1;

  1358. 

  1359.                                 if (dim == 2) {

  1360.                                     for (k = 0; k < step; ++k) {

  1361.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

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

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

  1364.                                     }

  1365.                                 } else if (dim == 4) {

  1366.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1367.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1368.                                         vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH

  1369.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH

  1370.                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH

  1371.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH

  1372.                                     }

  1373.                                 } else

  1374.                                 for (k = 0; k < step; ++k) {

  1375.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1376.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1377.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH

  1378.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH

  1379. 

  1380.                                         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);

  1381.                                     }

  1382.                                 }

  1383. 

  1384.                             } else if (vr_type == 2) {

  1385.                                 voffs = voffset;

  1386. 

  1387.                                 for (k = 0; k < step; ++k) {

  1388.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1389.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1390.                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %

  1391. 

  1392.                                         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);

  1393.                                     }

  1394.                                 }

  1395.                             }

  1396.                         }

  1397.                     }

  1398.                     j_times_ptns_to_read += ptns_to_read;

  1399.                 }

  1400.                 ++partition_count;

  1401.                 voffset += vr->partition_size;

  1402.             }

  1403.         }

  1404.     }

  1405.     return 0;

  1406. }

  1407. 

  1408. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1409.                                         uint_fast8_t ch,

  1410.                                         uint_fast8_t *do_not_decode,

  1411.                                         float *vec, uint_fast16_t vlen)

  1412. {

  1413.     if (vr->type == 2)

  1414.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1415.     else if (vr->type == 1)

  1416.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1417.     else if (vr->type == 0)

  1418.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1419.     else {

  1420.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1421.         return -1;

  1422.     }

  1423. }

  1424. 

  1425. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1426. {

  1427.     int i;

  1428.     for (i = 0;  i < blocksize;  i++) {

  1429.         if (mag[i] > 0.0) {

  1430.             if (ang[i] > 0.0) {

  1431.                 ang[i] = mag[i] - ang[i];

  1432.             } else {

  1433.                 float temp = ang[i];

  1434.                 ang[i]     = mag[i];

  1435.                 mag[i]    += temp;

  1436.             }

  1437.         } else {

  1438.             if (ang[i] > 0.0) {

  1439.                 ang[i] += mag[i];

  1440.             } else {

  1441.                 float temp = ang[i];

  1442.                 ang[i]     = mag[i];

  1443.                 mag[i]    -= temp;

  1444.             }

  1445.         }

  1446.     }

  1447. }

  1448. 

  1449. // Decode the audio packet using the functions above

  1450. 

  1451. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1452. {

  1453.     GetBitContext *gb = &vc->gb;

  1454. 

  1455.     uint_fast8_t previous_window = vc->previous_window;

  1456.     uint_fast8_t mode_number;

  1457.     uint_fast8_t blockflag;

  1458.     uint_fast16_t blocksize;

  1459.     int_fast32_t i,j;

  1460.     uint_fast8_t no_residue[255];

  1461.     uint_fast8_t do_not_decode[255];

  1462.     vorbis_mapping *mapping;

  1463.     float *ch_res_ptr   = vc->channel_residues;

  1464.     float *ch_floor_ptr = vc->channel_floors;

  1465.     uint_fast8_t res_chan[255];

  1466.     uint_fast8_t res_num = 0;

  1467.     int_fast16_t retlen  = 0;

  1468. 

  1469.     if (get_bits1(gb)) {

  1470.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1471.         return -1; // packet type not audio

  1472.     }

  1473. 

  1474.     if (vc->mode_count == 1) {

  1475.         mode_number = 0;

  1476.     } else {

  1477.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1478.     }

  1479.     vc->mode_number = mode_number;

  1480.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1481. 

  1482.     AV_DEBUG(" Mode number: %d , mapping: %d , blocktype %d \n", mode_number, vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1483. 

  1484.     blockflag = vc->modes[mode_number].blockflag;

  1485.     blocksize = vc->blocksize[blockflag];

  1486.     if (blockflag)

  1487.         skip_bits(gb, 2); // previous_window, next_window

  1488. 

  1489.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1490.     memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1491. 

  1492. // Decode floor

  1493. 

  1494.     for (i = 0; i < vc->audio_channels; ++i) {

  1495.         vorbis_floor *floor;

  1496.         int ret;

  1497.         if (mapping->submaps > 1) {

  1498.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1499.         } else {

  1500.             floor = &vc->floors[mapping->submap_floor[0]];

  1501.         }

  1502. 

  1503.         ret = floor->decode(vc, &floor->data, ch_floor_ptr);

  1504. 

  1505.         if (ret < 0) {

  1506.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1507.             return -1;

  1508.         }

  1509.         no_residue[i] = ret;

  1510.         ch_floor_ptr += blocksize / 2;

  1511.     }

  1512. 

  1513. // Nonzero vector propagate

  1514. 

  1515.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1516.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

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

  1518.             no_residue[mapping->angle[i]]     = 0;

  1519.         }

  1520.     }

  1521. 

  1522. // Decode residue

  1523. 

  1524.     for (i = 0; i < mapping->submaps; ++i) {

  1525.         vorbis_residue *residue;

  1526.         uint_fast8_t ch = 0;

  1527. 

  1528.         for (j = 0; j < vc->audio_channels; ++j) {

  1529.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1530.                 res_chan[j] = res_num;

  1531.                 if (no_residue[j]) {

  1532.                     do_not_decode[ch] = 1;

  1533.                 } else {

  1534.                     do_not_decode[ch] = 0;

  1535.                 }

  1536.                 ++ch;

  1537.                 ++res_num;

  1538.             }

  1539.         }

  1540.         residue = &vc->residues[mapping->submap_residue[i]];

  1541.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1542. 

  1543.         ch_res_ptr += ch * blocksize / 2;

  1544.     }

  1545. 

  1546. // Inverse coupling

  1547. 

  1548.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1549.         float *mag, *ang;

  1550. 

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

  1552.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1553.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1554.     }

  1555. 

  1556. // Dotproduct, MDCT

  1557. 

  1558.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1559.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;

  1560.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1561.         vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);

  1562.         ff_imdct_half(&vc->mdct[blockflag], ch_res_ptr, ch_floor_ptr);

  1563.     }

  1564. 

  1565. // Overlap/add, save data for next overlapping  FPMATH

  1566. 

  1567.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

  1568.     for (j = 0; j < vc->audio_channels; j++) {

  1569.         uint_fast16_t bs0 = vc->blocksize[0];

  1570.         uint_fast16_t bs1 = vc->blocksize[1];

  1571.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1572.         float *saved      = vc->saved + j * bs1 / 4;

  1573.         float *ret        = vc->channel_floors + j * retlen;

  1574.         float *buf        = residue;

  1575.         const float *win  = vc->win[blockflag & previous_window];

  1576. 

  1577.         if (blockflag == previous_window) {

  1578.             vc->dsp.vector_fmul_window(ret, saved, buf, win, 0, blocksize / 4);

  1579.         } else if (blockflag > previous_window) {

  1580.             vc->dsp.vector_fmul_window(ret, saved, buf, win, 0, bs0 / 4);

  1581.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1582.         } else {

  1583.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1584.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, 0, bs0 / 4);

  1585.         }

  1586.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1587.     }

  1588. 

  1589.     vc->previous_window = blockflag;

  1590.     return retlen;

  1591. }

  1592. 

  1593. // Return the decoded audio packet through the standard api

  1594. 

  1595. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1596.                                void *data, int *data_size,

  1597.                                AVPacket *avpkt)

  1598. {

  1599.     const uint8_t *buf = avpkt->data;

  1600.     int buf_size       = avpkt->size;

  1601.     vorbis_context *vc = avccontext->priv_data ;

  1602.     GetBitContext *gb = &(vc->gb);

  1603.     const float *channel_ptrs[255];

  1604.     int i;

  1605. 

  1606.     int_fast16_t len;

  1607. 

  1608.     if (!buf_size)

  1609.         return 0;

  1610. 

  1611.     AV_DEBUG("packet length %d \n", buf_size);

  1612. 

  1613.     init_get_bits(gb, buf, buf_size*8);

  1614. 

  1615.     len = vorbis_parse_audio_packet(vc);

  1616. 

  1617.     if (len <= 0) {

  1618.         *data_size = 0;

  1619.         return buf_size;

  1620.     }

  1621. 

  1622.     if (!vc->first_frame) {

  1623.         vc->first_frame = 1;

  1624.         *data_size = 0;

  1625.         return buf_size ;

  1626.     }

  1627. 

  1628.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1629. 

  1630.     if (vc->audio_channels > 8) {

  1631.         for (i = 0; i < vc->audio_channels; i++)

  1632.             channel_ptrs[i] = vc->channel_floors + i * len;

  1633.     } else {

  1634.         for (i = 0; i < vc->audio_channels; i++)

  1635.             channel_ptrs[i] = vc->channel_floors +

  1636.                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1637.     }

  1638. 

  1639.     vc->dsp.float_to_int16_interleave(data, channel_ptrs, len, vc->audio_channels);

  1640.     *data_size = len * 2 * vc->audio_channels;

  1641. 

  1642.     return buf_size ;

  1643. }

  1644. 

  1645. // Close decoder

  1646. 

  1647. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1648. {

  1649.     vorbis_context *vc = avccontext->priv_data;

  1650. 

  1651.     vorbis_free(vc);

  1652. 

  1653.     return 0 ;

  1654. }

  1655. 

  1656. AVCodec ff_vorbis_decoder = {

  1657.     "vorbis",

  1658.     AVMEDIA_TYPE_AUDIO,

  1659.     CODEC_ID_VORBIS,

  1660.     sizeof(vorbis_context),

  1661.     vorbis_decode_init,

  1662.     NULL,

  1663.     vorbis_decode_close,

  1664.     vorbis_decode_frame,

  1665.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1666.     .channel_layouts = ff_vorbis_channel_layouts,

  1667. };