falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
31848 Commits
32 Branches
283MB
Tree: 0fec2cb15c
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '0fec2cb15c'
${ noResults }
FFmpeg/libavcodec/vorbisdec.c

1717 lines
63KB
Raw Blame History 

  1. /*

  2.  * This file is part of Libav.

  3.  *

  4.  * Libav is free software; you can redistribute it and/or

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

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

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

  8.  *

  9.  * Libav is distributed in the hope that it will be useful,

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

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

  12.  * Lesser General Public License for more details.

  13.  *

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

  15.  * License along with Libav; if not, write to the Free Software

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

  17.  */

  18. 

  19. /**

  20.  * @file

  21.  * Vorbis I decoder

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

  23.  */

  24. 

  25. #include <inttypes.h>

  26. #include <math.h>

  27. 

  28. #define BITSTREAM_READER_LE

  29. #include "avcodec.h"

  30. #include "get_bits.h"

  31. #include "dsputil.h"

  32. #include "fft.h"

  33. #include "fmtconvert.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. #undef NDEBUG

  44. #include <assert.h>

  45. 

  46. typedef struct {

  47.     uint8_t      dimensions;

  48.     uint8_t      lookup_type;

  49.     uint8_t      maxdepth;

  50.     VLC          vlc;

  51.     float       *codevectors;

  52.     unsigned int nb_bits;

  53. } vorbis_codebook;

  54. 

  55. typedef union  vorbis_floor_u  vorbis_floor_data;

  56. typedef struct vorbis_floor0_s vorbis_floor0;

  57. typedef struct vorbis_floor1_s vorbis_floor1;

  58. struct vorbis_context_s;

  59. typedef

  60. int (* vorbis_floor_decode_func)

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

  62. typedef struct {

  63.     uint8_t floor_type;

  64.     vorbis_floor_decode_func decode;

  65.     union vorbis_floor_u {

  66.         struct vorbis_floor0_s {

  67.             uint8_t       order;

  68.             uint16_t      rate;

  69.             uint16_t      bark_map_size;

  70.             int32_t      *map[2];

  71.             uint32_t      map_size[2];

  72.             uint8_t       amplitude_bits;

  73.             uint8_t       amplitude_offset;

  74.             uint8_t       num_books;

  75.             uint8_t      *book_list;

  76.             float        *lsp;

  77.         } t0;

  78.         struct vorbis_floor1_s {

  79.             uint8_t       partitions;

  80.             uint8_t       partition_class[32];

  81.             uint8_t       class_dimensions[16];

  82.             uint8_t       class_subclasses[16];

  83.             uint8_t       class_masterbook[16];

  84.             int16_t       subclass_books[16][8];

  85.             uint8_t       multiplier;

  86.             uint16_t      x_list_dim;

  87.             vorbis_floor1_entry *list;

  88.         } t1;

  89.     } data;

  90. } vorbis_floor;

  91. 

  92. typedef struct {

  93.     uint16_t      type;

  94.     uint32_t      begin;

  95.     uint32_t      end;

  96.     unsigned      partition_size;

  97.     uint8_t       classifications;

  98.     uint8_t       classbook;

  99.     int16_t       books[64][8];

  100.     uint8_t       maxpass;

  101.     uint16_t      ptns_to_read;

  102.     uint8_t      *classifs;

  103. } vorbis_residue;

  104. 

  105. typedef struct {

  106.     uint8_t       submaps;

  107.     uint16_t      coupling_steps;

  108.     uint8_t      *magnitude;

  109.     uint8_t      *angle;

  110.     uint8_t      *mux;

  111.     uint8_t       submap_floor[16];

  112.     uint8_t       submap_residue[16];

  113. } vorbis_mapping;

  114. 

  115. typedef struct {

  116.     uint8_t       blockflag;

  117.     uint16_t      windowtype;

  118.     uint16_t      transformtype;

  119.     uint8_t       mapping;

  120. } vorbis_mode;

  121. 

  122. typedef struct vorbis_context_s {

  123.     AVCodecContext *avccontext;

  124.     AVFrame frame;

  125.     GetBitContext gb;

  126.     DSPContext dsp;

  127.     FmtConvertContext fmt_conv;

  128. 

  129.     FFTContext mdct[2];

  130.     uint8_t       first_frame;

  131.     uint32_t      version;

  132.     uint8_t       audio_channels;

  133.     uint32_t      audio_samplerate;

  134.     uint32_t      bitrate_maximum;

  135.     uint32_t      bitrate_nominal;

  136.     uint32_t      bitrate_minimum;

  137.     uint32_t      blocksize[2];

  138.     const float  *win[2];

  139.     uint16_t      codebook_count;

  140.     vorbis_codebook *codebooks;

  141.     uint8_t       floor_count;

  142.     vorbis_floor *floors;

  143.     uint8_t       residue_count;

  144.     vorbis_residue *residues;

  145.     uint8_t       mapping_count;

  146.     vorbis_mapping *mappings;

  147.     uint8_t       mode_count;

  148.     vorbis_mode  *modes;

  149.     uint8_t       mode_number; // mode number for the current packet

  150.     uint8_t       previous_window;

  151.     float        *channel_residues;

  152.     float        *channel_floors;

  153.     float        *saved;

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

  155. } vorbis_context;

  156. 

  157. /* Helper functions */

  158. 

  159. #define BARK(x) \

  160.     (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))

  161. 

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

  163. #define VALIDATE_INDEX(idx, limit) \

  164.     if (idx >= limit) {\

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

  166.                idx_err_str,\

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

  168.         return AVERROR_INVALIDDATA;\

  169.     }

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

  171.     {\

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

  173.         VALIDATE_INDEX(idx, limit)\

  174.     }

  175. 

  176. static float vorbisfloat2float(unsigned val)

  177. {

  178.     double mant = val & 0x1fffff;

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

  180.     if (val & 0x80000000)

  181.         mant = -mant;

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

  183. }

  184. 

  185. 

  186. // Free all allocated memory -----------------------------------------

  187. 

  188. static void vorbis_free(vorbis_context *vc)

  189. {

  190.     int i;

  191. 

  192.     av_freep(&vc->channel_residues);

  193.     av_freep(&vc->channel_floors);

  194.     av_freep(&vc->saved);

  195. 

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

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

  198.     av_freep(&vc->residues);

  199.     av_freep(&vc->modes);

  200. 

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

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

  203. 

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

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

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

  207.     }

  208.     av_freep(&vc->codebooks);

  209. 

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

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

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

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

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

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

  216.         } else {

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

  218.         }

  219.     }

  220.     av_freep(&vc->floors);

  221. 

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

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

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

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

  226.     }

  227.     av_freep(&vc->mappings);

  228. }

  229. 

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

  231. 

  232. // Process codebooks part

  233. 

  234. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  235. {

  236.     unsigned cb;

  237.     uint8_t  *tmp_vlc_bits;

  238.     uint32_t *tmp_vlc_codes;

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

  240.     uint16_t *codebook_multiplicands;

  241.     int ret = 0;

  242. 

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

  244. 

  245.     av_dlog(NULL, " Codebooks: %d \n", vc->codebook_count);

  246. 

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

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

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

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

  251. 

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

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

  254.         unsigned ordered, t, entries, used_entries = 0;

  255. 

  256.         av_dlog(NULL, " %u. Codebook\n", cb);

  257. 

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

  259.             av_log(vc->avccontext, AV_LOG_ERROR,

  260.                    " %u. Codebook setup data corrupt.\n", cb);

  261.             ret = AVERROR_INVALIDDATA;

  262.             goto error;

  263.         }

  264. 

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

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

  267.             av_log(vc->avccontext, AV_LOG_ERROR,

  268.                    " %u. Codebook's dimension is invalid (%d).\n",

  269.                    cb, codebook_setup->dimensions);

  270.             ret = AVERROR_INVALIDDATA;

  271.             goto error;

  272.         }

  273.         entries = get_bits(gb, 24);

  274.         if (entries > V_MAX_VLCS) {

  275.             av_log(vc->avccontext, AV_LOG_ERROR,

  276.                    " %u. Codebook has too many entries (%u).\n",

  277.                    cb, entries);

  278.             ret = AVERROR_INVALIDDATA;

  279.             goto error;

  280.         }

  281. 

  282.         ordered = get_bits1(gb);

  283. 

  284.         av_dlog(NULL, " codebook_dimensions %d, codebook_entries %u\n",

  285.                 codebook_setup->dimensions, entries);

  286. 

  287.         if (!ordered) {

  288.             unsigned ce, flag;

  289.             unsigned sparse = get_bits1(gb);

  290. 

  291.             av_dlog(NULL, " not ordered \n");

  292. 

  293.             if (sparse) {

  294.                 av_dlog(NULL, " sparse \n");

  295. 

  296.                 used_entries = 0;

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

  298.                     flag = get_bits1(gb);

  299.                     if (flag) {

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

  301.                         ++used_entries;

  302.                     } else

  303.                         tmp_vlc_bits[ce] = 0;

  304.                 }

  305.             } else {

  306.                 av_dlog(NULL, " not sparse \n");

  307. 

  308.                 used_entries = entries;

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

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

  311.             }

  312.         } else {

  313.             unsigned current_entry  = 0;

  314.             unsigned current_length = get_bits(gb, 5) + 1;

  315. 

  316.             av_dlog(NULL, " ordered, current length: %u\n", current_length);  //FIXME

  317. 

  318.             used_entries = entries;

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

  320.                 unsigned i, number;

  321. 

  322.                 av_dlog(NULL, " number bits: %u ", ilog(entries - current_entry));

  323. 

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

  325. 

  326.                 av_dlog(NULL, " number: %u\n", number);

  327. 

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

  329.                     if (i < used_entries)

  330.                         tmp_vlc_bits[i] = current_length;

  331. 

  332.                 current_entry+=number;

  333.             }

  334.             if (current_entry>used_entries) {

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

  336.                 ret = AVERROR_INVALIDDATA;

  337.                 goto error;

  338.             }

  339.         }

  340. 

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

  342. 

  343.         av_dlog(NULL, " lookup type: %d : %s \n", codebook_setup->lookup_type,

  344.                 codebook_setup->lookup_type ? "vq" : "no lookup");

  345. 

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

  347. 

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

  349.             unsigned i, j, k;

  350.             unsigned codebook_lookup_values = ff_vorbis_nth_root(entries, codebook_setup->dimensions);

  351. 

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

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

  354.             unsigned codebook_value_bits = get_bits(gb, 4) + 1;

  355.             unsigned codebook_sequence_p = get_bits1(gb);

  356. 

  357.             av_dlog(NULL, " We expect %d numbers for building the codevectors. \n",

  358.                     codebook_lookup_values);

  359.             av_dlog(NULL, "  delta %f minmum %f \n",

  360.                     codebook_delta_value, codebook_minimum_value);

  361. 

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

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

  364. 

  365.                 av_dlog(NULL, " multiplicands*delta+minmum : %e \n",

  366.                         (float)codebook_multiplicands[i] * codebook_delta_value + codebook_minimum_value);

  367.                 av_dlog(NULL, " multiplicand %u\n", codebook_multiplicands[i]);

  368.             }

  369. 

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

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

  372.                                                                     codebook_setup->dimensions *

  373.                                                                     sizeof(*codebook_setup->codevectors))

  374.                                                        : NULL;

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

  376.                 unsigned dim = codebook_setup->dimensions;

  377. 

  378.                 if (tmp_vlc_bits[i]) {

  379.                     float last = 0.0;

  380.                     unsigned lookup_offset = i;

  381. 

  382.                     av_dlog(vc->avccontext, "Lookup offset %u ,", i);

  383. 

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

  385.                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  387.                         if (codebook_sequence_p)

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

  389.                         lookup_offset/=codebook_lookup_values;

  390.                     }

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

  392. 

  393.                     av_dlog(vc->avccontext, "real lookup offset %u, vector: ", j);

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

  395.                         av_dlog(vc->avccontext, " %f ",

  396.                                 codebook_setup->codevectors[j * dim + k]);

  397.                     av_dlog(vc->avccontext, "\n");

  398. 

  399.                     ++j;

  400.                 }

  401.             }

  402.             if (j != used_entries) {

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

  404.                 ret = AVERROR_INVALIDDATA;

  405.                 goto error;

  406.             }

  407.             entries = used_entries;

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

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

  410.             ret = AVERROR_INVALIDDATA;

  411.             goto error;

  412.         }

  413. 

  414. // Initialize VLC table

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

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

  417.             ret = AVERROR_INVALIDDATA;

  418.             goto error;

  419.         }

  420.         codebook_setup->maxdepth = 0;

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

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

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

  424. 

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

  426.             codebook_setup->nb_bits = V_NB_BITS2;

  427.         else

  428.             codebook_setup->nb_bits = V_NB_BITS;

  429. 

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

  431. 

  432.         if ((ret = init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits,

  433.                             entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits),

  434.                             sizeof(*tmp_vlc_bits), tmp_vlc_codes,

  435.                             sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),

  436.                             INIT_VLC_LE))) {

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

  438.             goto error;

  439.         }

  440.     }

  441. 

  442.     av_free(tmp_vlc_bits);

  443.     av_free(tmp_vlc_codes);

  444.     av_free(codebook_multiplicands);

  445.     return 0;

  446. 

  447. // Error:

  448. error:

  449.     av_free(tmp_vlc_bits);

  450.     av_free(tmp_vlc_codes);

  451.     av_free(codebook_multiplicands);

  452.     return ret;

  453. }

  454. 

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

  456. 

  457. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  458. {

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

  460.     unsigned i, vorbis_time_count = get_bits(gb, 6) + 1;

  461. 

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

  463.         unsigned vorbis_tdtransform = get_bits(gb, 16);

  464. 

  465.         av_dlog(NULL, " Vorbis time domain transform %u: %u\n",

  466.                 vorbis_time_count, vorbis_tdtransform);

  467. 

  468.         if (vorbis_tdtransform) {

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

  470.             return AVERROR_INVALIDDATA;

  471.         }

  472.     }

  473.     return 0;

  474. }

  475. 

  476. // Process floors part

  477. 

  478. static int vorbis_floor0_decode(vorbis_context *vc,

  479.                                 vorbis_floor_data *vfu, float *vec);

  480. static void create_map(vorbis_context *vc, unsigned floor_number);

  481. static int vorbis_floor1_decode(vorbis_context *vc,

  482.                                 vorbis_floor_data *vfu, float *vec);

  483. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  484. {

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

  486.     int i,j,k;

  487. 

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

  489. 

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

  491. 

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

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

  494. 

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

  496. 

  497.         av_dlog(NULL, " %d. floor type %d \n", i, floor_setup->floor_type);

  498. 

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

  500.             int maximum_class = -1;

  501.             unsigned rangebits, rangemax, floor1_values = 2;

  502. 

  503.             floor_setup->decode = vorbis_floor1_decode;

  504. 

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

  506. 

  507.             av_dlog(NULL, " %d.floor: %d partitions \n",

  508.                     i, floor_setup->data.t1.partitions);

  509. 

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

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

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

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

  514. 

  515.                 av_dlog(NULL, " %d. floor %d partition class %d \n",

  516.                         i, j, floor_setup->data.t1.partition_class[j]);

  517. 

  518.             }

  519. 

  520.             av_dlog(NULL, " maximum class %d \n", maximum_class);

  521. 

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

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

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

  525. 

  526.                 av_dlog(NULL, " %d floor %d class dim: %d subclasses %d \n", i, j,

  527.                         floor_setup->data.t1.class_dimensions[j],

  528.                         floor_setup->data.t1.class_subclasses[j]);

  529. 

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

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

  532. 

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

  534.                 }

  535. 

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

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

  538.                     if (bits != -1)

  539.                         VALIDATE_INDEX(bits, vc->codebook_count)

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

  541. 

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

  543.                 }

  544.             }

  545. 

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

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

  548. 

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

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

  551. 

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

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

  554. 

  555. 

  556.             rangebits = get_bits(gb, 4);

  557.             rangemax = (1 << rangebits);

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

  559.                 av_log(vc->avccontext, AV_LOG_ERROR,

  560.                        "Floor value is too large for blocksize: %u (%"PRIu32")\n",

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

  562.                 return AVERROR_INVALIDDATA;

  563.             }

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

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

  566. 

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

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

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

  570. 

  571.                     av_dlog(NULL, " %u. floor1 Y coord. %d\n", floor1_values,

  572.                             floor_setup->data.t1.list[floor1_values].x);

  573.                 }

  574.             }

  575. 

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

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

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

  579.             unsigned max_codebook_dim = 0;

  580. 

  581.             floor_setup->decode = vorbis_floor0_decode;

  582. 

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

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

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

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

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

  588.              * 2^0 - 1 == 0                             */

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

  590.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

  592.                 return AVERROR_INVALIDDATA;

  593.             }

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

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

  596. 

  597.             /* allocate mem for booklist */

  598.             floor_setup->data.t0.book_list =

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

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

  601.                 return AVERROR(ENOMEM);

  602.             /* read book indexes */

  603.             {

  604.                 int idx;

  605.                 unsigned book_idx;

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

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

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

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

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

  611.                 }

  612.             }

  613. 

  614.             create_map(vc, i);

  615. 

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

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

  618.             floor_setup->data.t0.lsp =

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

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

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

  622.                 return AVERROR(ENOMEM);

  623. 

  624.             /* debug output parsed headers */

  625.             av_dlog(NULL, "floor0 order: %u\n", floor_setup->data.t0.order);

  626.             av_dlog(NULL, "floor0 rate: %u\n", floor_setup->data.t0.rate);

  627.             av_dlog(NULL, "floor0 bark map size: %u\n",

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

  629.             av_dlog(NULL, "floor0 amplitude bits: %u\n",

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

  631.             av_dlog(NULL, "floor0 amplitude offset: %u\n",

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

  633.             av_dlog(NULL, "floor0 number of books: %u\n",

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

  635.             av_dlog(NULL, "floor0 book list pointer: %p\n",

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

  637.             {

  638.                 int idx;

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

  640.                     av_dlog(NULL, "  Book %d: %u\n", idx + 1,

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

  642.                 }

  643.             }

  644.         } else {

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

  646.             return AVERROR_INVALIDDATA;

  647.         }

  648.     }

  649.     return 0;

  650. }

  651. 

  652. // Process residues part

  653. 

  654. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  655. {

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

  657.     unsigned i, j, k;

  658. 

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

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

  661. 

  662.     av_dlog(NULL, " There are %d residues. \n", vc->residue_count);

  663. 

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

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

  666.         uint8_t cascade[64];

  667.         unsigned high_bits, low_bits;

  668. 

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

  670. 

  671.         av_dlog(NULL, " %u. residue type %d\n", i, res_setup->type);

  672. 

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

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

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

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

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

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

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

  680.             av_log(vc->avccontext, AV_LOG_ERROR,

  681.                    "partition out of bounds: type, begin, end, size, blocksize: %"PRIu16", %"PRIu32", %"PRIu32", %u, %"PRIu32"\n",

  682.                    res_setup->type, res_setup->begin, res_setup->end,

  683.                    res_setup->partition_size, vc->blocksize[1] / 2);

  684.             return AVERROR_INVALIDDATA;

  685.         }

  686. 

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

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

  689. 

  690.         res_setup->ptns_to_read =

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

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

  693.                                         vc->audio_channels *

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

  695.         if (!res_setup->classifs)

  696.             return AVERROR(ENOMEM);

  697. 

  698.         av_dlog(NULL, "    begin %d end %d part.size %d classif.s %d classbook %d \n",

  699.                 res_setup->begin, res_setup->end, res_setup->partition_size,

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

  701. 

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

  703.             high_bits = 0;

  704.             low_bits  = get_bits(gb, 3);

  705.             if (get_bits1(gb))

  706.                 high_bits = get_bits(gb, 5);

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

  708. 

  709.             av_dlog(NULL, "     %u class cascade depth: %d\n", j, ilog(cascade[j]));

  710.         }

  711. 

  712.         res_setup->maxpass = 0;

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

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

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

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

  717. 

  718.                     av_dlog(NULL, "     %u class cascade depth %u book: %d\n",

  719.                             j, k, res_setup->books[j][k]);

  720. 

  721.                     if (k>res_setup->maxpass)

  722.                         res_setup->maxpass = k;

  723.                 } else {

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

  725.                 }

  726.             }

  727.         }

  728.     }

  729.     return 0;

  730. }

  731. 

  732. // Process mappings part

  733. 

  734. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  735. {

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

  737.     unsigned i, j;

  738. 

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

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

  741. 

  742.     av_dlog(NULL, " There are %d mappings. \n", vc->mapping_count);

  743. 

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

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

  746. 

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

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

  749.             return AVERROR_INVALIDDATA;

  750.         }

  751.         if (get_bits1(gb)) {

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

  753.         } else {

  754.             mapping_setup->submaps = 1;

  755.         }

  756. 

  757.         if (get_bits1(gb)) {

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

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

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

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

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

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

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

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

  766.             }

  767.         } else {

  768.             mapping_setup->coupling_steps = 0;

  769.         }

  770. 

  771.         av_dlog(NULL, "   %u mapping coupling steps: %d\n",

  772.                 i, mapping_setup->coupling_steps);

  773. 

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

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

  776.             return AVERROR_INVALIDDATA; // following spec.

  777.         }

  778. 

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

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

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

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

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

  784.         }

  785. 

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

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

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

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

  790. 

  791.             av_dlog(NULL, "   %u mapping %u submap : floor %d, residue %d\n", i, j,

  792.                     mapping_setup->submap_floor[j],

  793.                     mapping_setup->submap_residue[j]);

  794.         }

  795.     }

  796.     return 0;

  797. }

  798. 

  799. // Process modes part

  800. 

  801. static void create_map(vorbis_context *vc, unsigned floor_number)

  802. {

  803.     vorbis_floor *floors = vc->floors;

  804.     vorbis_floor0 *vf;

  805.     int idx;

  806.     int blockflag, n;

  807.     int32_t *map;

  808. 

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

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

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

  812.             av_malloc((n + 1) * sizeof(int32_t)); // n + sentinel

  813. 

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

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

  816. 

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

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

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

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

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

  822.         }

  823.         map[n] = -1;

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

  825.     }

  826. 

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

  828.         av_dlog(NULL, "floor0 map: map at pos %d is %d\n", idx, map[idx]);

  829.     }

  830. }

  831. 

  832. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  833. {

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

  835.     unsigned i;

  836. 

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

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

  839. 

  840.     av_dlog(NULL, " There are %d modes.\n", vc->mode_count);

  841. 

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

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

  844. 

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

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

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

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

  849. 

  850.         av_dlog(NULL, " %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",

  851.                 i, mode_setup->blockflag, mode_setup->windowtype,

  852.                 mode_setup->transformtype, mode_setup->mapping);

  853.     }

  854.     return 0;

  855. }

  856. 

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

  858. 

  859. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  860. {

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

  862.     int ret;

  863. 

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

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

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

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

  868.         return AVERROR_INVALIDDATA;

  869.     }

  870. 

  871.     if ((ret = vorbis_parse_setup_hdr_codebooks(vc))) {

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

  873.         return ret;

  874.     }

  875.     if ((ret = vorbis_parse_setup_hdr_tdtransforms(vc))) {

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

  877.         return ret;

  878.     }

  879.     if ((ret = vorbis_parse_setup_hdr_floors(vc))) {

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

  881.         return ret;

  882.     }

  883.     if ((ret = vorbis_parse_setup_hdr_residues(vc))) {

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

  885.         return ret;

  886.     }

  887.     if ((ret = vorbis_parse_setup_hdr_mappings(vc))) {

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

  889.         return ret;

  890.     }

  891.     if ((ret = vorbis_parse_setup_hdr_modes(vc))) {

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

  893.         return ret;

  894.     }

  895.     if (!get_bits1(gb)) {

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

  897.         return AVERROR_INVALIDDATA; // framing flag bit unset error

  898.     }

  899. 

  900.     return 0;

  901. }

  902. 

  903. // Process the identification header

  904. 

  905. static int vorbis_parse_id_hdr(vorbis_context *vc)

  906. {

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

  908.     unsigned bl0, bl1;

  909. 

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

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

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

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

  914.         return AVERROR_INVALIDDATA;

  915.     }

  916. 

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

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

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

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

  921.         return AVERROR_INVALIDDATA;

  922.     }

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

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

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

  926.         return AVERROR_INVALIDDATA;

  927.     }

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

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

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

  931.     bl0 = get_bits(gb, 4);

  932.     bl1 = get_bits(gb, 4);

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

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

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

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

  937.         return AVERROR_INVALIDDATA;

  938.     }

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

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

  941. 

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

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

  944.         return AVERROR_INVALIDDATA;

  945.     }

  946. 

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

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

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

  950.     vc->previous_window  = 0;

  951. 

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

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

  954. 

  955.     av_dlog(NULL, " 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 ",

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

  957. 

  958. /*

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

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

  961.         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)));

  962.     }

  963. */

  964. 

  965.     return 0;

  966. }

  967. 

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

  969. 

  970. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  971. {

  972.     vorbis_context *vc = avccontext->priv_data;

  973.     uint8_t *headers   = avccontext->extradata;

  974.     int headers_len    = avccontext->extradata_size;

  975.     uint8_t *header_start[3];

  976.     int header_len[3];

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

  978.     int hdr_type, ret;

  979. 

  980.     vc->avccontext = avccontext;

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

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

  983. 

  984.     if (avccontext->request_sample_fmt == AV_SAMPLE_FMT_FLT) {

  985.         avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;

  986.         vc->scale_bias = 1.0f;

  987.     } else {

  988.         avccontext->sample_fmt = AV_SAMPLE_FMT_S16;

  989.         vc->scale_bias = 32768.0f;

  990.     }

  991. 

  992.     if (!headers_len) {

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

  994.         return AVERROR_INVALIDDATA;

  995.     }

  996. 

  997.     if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {

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

  999.         return ret;

  1000.     }

  1001. 

  1002.     init_get_bits(gb, header_start[0], header_len[0]*8);

  1003.     hdr_type = get_bits(gb, 8);

  1004.     if (hdr_type != 1) {

  1005.         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");

  1006.         return AVERROR_INVALIDDATA;

  1007.     }

  1008.     if ((ret = vorbis_parse_id_hdr(vc))) {

  1009.         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");

  1010.         vorbis_free(vc);

  1011.         return ret;

  1012.     }

  1013. 

  1014.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1015.     hdr_type = get_bits(gb, 8);

  1016.     if (hdr_type != 5) {

  1017.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1018.         vorbis_free(vc);

  1019.         return AVERROR_INVALIDDATA;

  1020.     }

  1021.     if ((ret = vorbis_parse_setup_hdr(vc))) {

  1022.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1023.         vorbis_free(vc);

  1024.         return ret;

  1025.     }

  1026. 

  1027.     if (vc->audio_channels > 8)

  1028.         avccontext->channel_layout = 0;

  1029.     else

  1030.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1031. 

  1032.     avccontext->channels    = vc->audio_channels;

  1033.     avccontext->sample_rate = vc->audio_samplerate;

  1034.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;

  1035. 

  1036.     avcodec_get_frame_defaults(&vc->frame);

  1037.     avccontext->coded_frame = &vc->frame;

  1038. 

  1039.     return 0;

  1040. }

  1041. 

  1042. // Decode audiopackets -------------------------------------------------

  1043. 

  1044. // Read and decode floor

  1045. 

  1046. static int vorbis_floor0_decode(vorbis_context *vc,

  1047.                                 vorbis_floor_data *vfu, float *vec)

  1048. {

  1049.     vorbis_floor0 *vf = &vfu->t0;

  1050.     float *lsp = vf->lsp;

  1051.     unsigned amplitude, book_idx;

  1052.     unsigned blockflag = vc->modes[vc->mode_number].blockflag;

  1053. 

  1054.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1055.     if (amplitude > 0) {

  1056.         float last = 0;

  1057.         unsigned idx, lsp_len = 0;

  1058.         vorbis_codebook codebook;

  1059. 

  1060.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1061.         if (book_idx >= vf->num_books) {

  1062.             av_log(vc->avccontext, AV_LOG_ERROR,

  1063.                     "floor0 dec: booknumber too high!\n");

  1064.             book_idx =  0;

  1065.         }

  1066.         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);

  1067.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1068.         /* Invalid codebook! */

  1069.         if (!codebook.codevectors)

  1070.             return AVERROR_INVALIDDATA;

  1071. 

  1072.         while (lsp_len<vf->order) {

  1073.             int vec_off;

  1074. 

  1075.             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);

  1076.             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1077.             /* read temp vector */

  1078.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1079.                                codebook.nb_bits, codebook.maxdepth)

  1080.                       * codebook.dimensions;

  1081.             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);

  1082.             /* copy each vector component and add last to it */

  1083.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1084.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1085.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1086. 

  1087.             lsp_len += codebook.dimensions;

  1088.         }

  1089.         /* DEBUG: output lsp coeffs */

  1090.         {

  1091.             int idx;

  1092.             for (idx = 0; idx < lsp_len; ++idx)

  1093.                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1094.         }

  1095. 

  1096.         /* synthesize floor output vector */

  1097.         {

  1098.             int i;

  1099.             int order = vf->order;

  1100.             float wstep = M_PI / vf->bark_map_size;

  1101. 

  1102.             for (i = 0; i < order; i++)

  1103.                 lsp[i] = 2.0f * cos(lsp[i]);

  1104. 

  1105.             av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",

  1106.                     vf->map_size[blockflag], order, wstep);

  1107. 

  1108.             i = 0;

  1109.             while (i < vf->map_size[blockflag]) {

  1110.                 int j, iter_cond = vf->map[blockflag][i];

  1111.                 float p = 0.5f;

  1112.                 float q = 0.5f;

  1113.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1114. 

  1115.                 /* similar part for the q and p products */

  1116.                 for (j = 0; j + 1 < order; j += 2) {

  1117.                     q *= lsp[j]     - two_cos_w;

  1118.                     p *= lsp[j + 1] - two_cos_w;

  1119.                 }

  1120.                 if (j == order) { // even order

  1121.                     p *= p * (2.0f - two_cos_w);

  1122.                     q *= q * (2.0f + two_cos_w);

  1123.                 } else { // odd order

  1124.                     q *= two_cos_w-lsp[j]; // one more time for q

  1125. 

  1126.                     /* final step and square */

  1127.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1128.                     q *= q;

  1129.                 }

  1130. 

  1131.                 /* calculate linear floor value */

  1132.                 q = exp((((amplitude*vf->amplitude_offset) /

  1133.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1134.                          - vf->amplitude_offset) * .11512925f);

  1135. 

  1136.                 /* fill vector */

  1137.                 do {

  1138.                     vec[i] = q; ++i;

  1139.                 } while (vf->map[blockflag][i] == iter_cond);

  1140.             }

  1141.         }

  1142.     } else {

  1143.         /* this channel is unused */

  1144.         return 1;

  1145.     }

  1146. 

  1147.     av_dlog(NULL, " Floor0 decoded\n");

  1148. 

  1149.     return 0;

  1150. }

  1151. 

  1152. static int vorbis_floor1_decode(vorbis_context *vc,

  1153.                                 vorbis_floor_data *vfu, float *vec)

  1154. {

  1155.     vorbis_floor1 *vf = &vfu->t1;

  1156.     GetBitContext *gb = &vc->gb;

  1157.     uint16_t range_v[4] = { 256, 128, 86, 64 };

  1158.     unsigned range = range_v[vf->multiplier - 1];

  1159.     uint16_t floor1_Y[258];

  1160.     uint16_t floor1_Y_final[258];

  1161.     int floor1_flag[258];

  1162.     unsigned class, cdim, cbits, csub, cval, offset, i, j;

  1163.     int book, adx, ady, dy, off, predicted, err;

  1164. 

  1165. 

  1166.     if (!get_bits1(gb)) // silence

  1167.         return 1;

  1168. 

  1169. // Read values (or differences) for the floor's points

  1170. 

  1171.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1172.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1173. 

  1174.     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1175. 

  1176.     offset = 2;

  1177.     for (i = 0; i < vf->partitions; ++i) {

  1178.         class = vf->partition_class[i];

  1179.         cdim   = vf->class_dimensions[class];

  1180.         cbits  = vf->class_subclasses[class];

  1181.         csub = (1 << cbits) - 1;

  1182.         cval = 0;

  1183. 

  1184.         av_dlog(NULL, "Cbits %u\n", cbits);

  1185. 

  1186.         if (cbits) // this reads all subclasses for this partition's class

  1187.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,

  1188.                             vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);

  1189. 

  1190.         for (j = 0; j < cdim; ++j) {

  1191.             book = vf->subclass_books[class][cval & csub];

  1192. 

  1193.             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",

  1194.                     book, cbits, cval, get_bits_count(gb));

  1195. 

  1196.             cval = cval >> cbits;

  1197.             if (book > -1) {

  1198.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1199.                 vc->codebooks[book].nb_bits, 3);

  1200.             } else {

  1201.                 floor1_Y[offset+j] = 0;

  1202.             }

  1203. 

  1204.             av_dlog(NULL, " floor(%d) = %d \n",

  1205.                     vf->list[offset+j].x, floor1_Y[offset+j]);

  1206.         }

  1207.         offset+=cdim;

  1208.     }

  1209. 

  1210. // Amplitude calculation from the differences

  1211. 

  1212.     floor1_flag[0] = 1;

  1213.     floor1_flag[1] = 1;

  1214.     floor1_Y_final[0] = floor1_Y[0];

  1215.     floor1_Y_final[1] = floor1_Y[1];

  1216. 

  1217.     for (i = 2; i < vf->x_list_dim; ++i) {

  1218.         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;

  1219. 

  1220.         low_neigh_offs  = vf->list[i].low;

  1221.         high_neigh_offs = vf->list[i].high;

  1222.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1223.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1224.         ady = FFABS(dy);

  1225.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1226.         off = err / adx;

  1227.         if (dy < 0) {

  1228.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1229.         } else {

  1230.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1231.         } // render_point end

  1232. 

  1233.         val = floor1_Y[i];

  1234.         highroom = range-predicted;

  1235.         lowroom  = predicted;

  1236.         if (highroom < lowroom) {

  1237.             room = highroom * 2;

  1238.         } else {

  1239.             room = lowroom * 2;   // SPEC mispelling

  1240.         }

  1241.         if (val) {

  1242.             floor1_flag[low_neigh_offs]  = 1;

  1243.             floor1_flag[high_neigh_offs] = 1;

  1244.             floor1_flag[i]               = 1;

  1245.             if (val >= room) {

  1246.                 if (highroom > lowroom) {

  1247.                     floor1_Y_final[i] = val - lowroom + predicted;

  1248.                 } else {

  1249.                     floor1_Y_final[i] = predicted - val + highroom - 1;

  1250.                 }

  1251.             } else {

  1252.                 if (val & 1) {

  1253.                     floor1_Y_final[i] = predicted - (val + 1) / 2;

  1254.                 } else {

  1255.                     floor1_Y_final[i] = predicted + val / 2;

  1256.                 }

  1257.             }

  1258.         } else {

  1259.             floor1_flag[i]    = 0;

  1260.             floor1_Y_final[i] = predicted;

  1261.         }

  1262. 

  1263.         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",

  1264.                 vf->list[i].x, floor1_Y_final[i], val);

  1265.     }

  1266. 

  1267. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1268. 

  1269.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1270. 

  1271.     av_dlog(NULL, " Floor decoded\n");

  1272. 

  1273.     return 0;

  1274. }

  1275. 

  1276. // Read and decode residue

  1277. 

  1278. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1279.                                                            vorbis_residue *vr,

  1280.                                                            unsigned ch,

  1281.                                                            uint8_t *do_not_decode,

  1282.                                                            float *vec,

  1283.                                                            unsigned vlen,

  1284.                                                            unsigned ch_left,

  1285.                                                            int vr_type)

  1286. {

  1287.     GetBitContext *gb = &vc->gb;

  1288.     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;

  1289.     unsigned ptns_to_read = vr->ptns_to_read;

  1290.     uint8_t *classifs = vr->classifs;

  1291.     unsigned pass, ch_used, i, j, k, l;

  1292.     unsigned max_output = (ch - 1) * vlen;

  1293. 

  1294.     if (vr_type == 2) {

  1295.         for (j = 1; j < ch; ++j)

  1296.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1297.         if (do_not_decode[0])

  1298.             return 0;

  1299.         ch_used = 1;

  1300.         max_output += vr->end / ch;

  1301.     } else {

  1302.         ch_used = ch;

  1303.         max_output += vr->end;

  1304.     }

  1305. 

  1306.     if (max_output > ch_left * vlen) {

  1307.         av_log(vc->avccontext, AV_LOG_ERROR, "Insufficient output buffer\n");

  1308.         return -1;

  1309.     }

  1310. 

  1311.     av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1312. 

  1313.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1314.         uint16_t voffset, partition_count, j_times_ptns_to_read;

  1315. 

  1316.         voffset = vr->begin;

  1317.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1318.             if (!pass) {

  1319.                 unsigned inverse_class = ff_inverse[vr->classifications];

  1320.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1321.                     if (!do_not_decode[j]) {

  1322.                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1323.                                                  vc->codebooks[vr->classbook].nb_bits, 3);

  1324. 

  1325.                         av_dlog(NULL, "Classword: %u\n", temp);

  1326. 

  1327.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1328.                         for (i = 0; i < c_p_c; ++i) {

  1329.                             unsigned temp2;

  1330. 

  1331.                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;

  1332.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1333.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1334.                             temp = temp2;

  1335.                         }

  1336.                     }

  1337.                     j_times_ptns_to_read += ptns_to_read;

  1338.                 }

  1339.             }

  1340.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1341.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1342.                     unsigned voffs;

  1343. 

  1344.                     if (!do_not_decode[j]) {

  1345.                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];

  1346.                         int vqbook  = vr->books[vqclass][pass];

  1347. 

  1348.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1349.                             unsigned coffs;

  1350.                             unsigned dim  = vc->codebooks[vqbook].dimensions;

  1351.                             unsigned step = dim == 1 ? vr->partition_size

  1352.                                                      : FASTDIV(vr->partition_size, dim);

  1353.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1354. 

  1355.                             if (vr_type == 0) {

  1356. 

  1357.                                 voffs = voffset+j*vlen;

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

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

  1360.                                     for (l = 0; l < dim; ++l)

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

  1362.                                 }

  1363.                             } else if (vr_type == 1) {

  1364.                                 voffs = voffset + j * vlen;

  1365.                                 for (k = 0; k < step; ++k) {

  1366.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1367.                                     for (l = 0; l < dim; ++l, ++voffs) {

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

  1369. 

  1370.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d  \n",

  1371.                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1372.                                     }

  1373.                                 }

  1374.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1375.                                 voffs = voffset >> 1;

  1376. 

  1377.                                 if (dim == 2) {

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

  1379.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1380.                                         vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH

  1381.                                         vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH

  1382.                                     }

  1383.                                 } else if (dim == 4) {

  1384.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1385.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1386.                                         vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH

  1387.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH

  1388.                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH

  1389.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH

  1390.                                     }

  1391.                                 } else

  1392.                                 for (k = 0; k < step; ++k) {

  1393.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1394.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1395.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH

  1396.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH

  1397. 

  1398.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1399.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1400.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1401.                                                 codebook.codevectors[coffs + l], coffs, l);

  1402.                                     }

  1403.                                 }

  1404. 

  1405.                             } else if (vr_type == 2) {

  1406.                                 voffs = voffset;

  1407. 

  1408.                                 for (k = 0; k < step; ++k) {

  1409.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1410.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1411.                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %

  1412. 

  1413.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1414.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1415.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1416.                                                 codebook.codevectors[coffs + l], coffs, l);

  1417.                                     }

  1418.                                 }

  1419.                             }

  1420.                         }

  1421.                     }

  1422.                     j_times_ptns_to_read += ptns_to_read;

  1423.                 }

  1424.                 ++partition_count;

  1425.                 voffset += vr->partition_size;

  1426.             }

  1427.         }

  1428.     }

  1429.     return 0;

  1430. }

  1431. 

  1432. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1433.                                         unsigned ch,

  1434.                                         uint8_t *do_not_decode,

  1435.                                         float *vec, unsigned vlen,

  1436.                                         unsigned ch_left)

  1437. {

  1438.     if (vr->type == 2)

  1439.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);

  1440.     else if (vr->type == 1)

  1441.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);

  1442.     else if (vr->type == 0)

  1443.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);

  1444.     else {

  1445.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1446.         return AVERROR_INVALIDDATA;

  1447.     }

  1448. }

  1449. 

  1450. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1451. {

  1452.     int i;

  1453.     for (i = 0;  i < blocksize;  i++) {

  1454.         if (mag[i] > 0.0) {

  1455.             if (ang[i] > 0.0) {

  1456.                 ang[i] = mag[i] - ang[i];

  1457.             } else {

  1458.                 float temp = ang[i];

  1459.                 ang[i]     = mag[i];

  1460.                 mag[i]    += temp;

  1461.             }

  1462.         } else {

  1463.             if (ang[i] > 0.0) {

  1464.                 ang[i] += mag[i];

  1465.             } else {

  1466.                 float temp = ang[i];

  1467.                 ang[i]     = mag[i];

  1468.                 mag[i]    -= temp;

  1469.             }

  1470.         }

  1471.     }

  1472. }

  1473. 

  1474. // Decode the audio packet using the functions above

  1475. 

  1476. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1477. {

  1478.     GetBitContext *gb = &vc->gb;

  1479.     FFTContext *mdct;

  1480.     unsigned previous_window = vc->previous_window;

  1481.     unsigned mode_number, blockflag, blocksize;

  1482.     int i, j;

  1483.     uint8_t no_residue[255];

  1484.     uint8_t do_not_decode[255];

  1485.     vorbis_mapping *mapping;

  1486.     float *ch_res_ptr   = vc->channel_residues;

  1487.     float *ch_floor_ptr = vc->channel_floors;

  1488.     uint8_t res_chan[255];

  1489.     unsigned res_num = 0;

  1490.     int retlen  = 0;

  1491.     unsigned ch_left = vc->audio_channels;

  1492.     unsigned vlen;

  1493. 

  1494.     if (get_bits1(gb)) {

  1495.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1496.         return AVERROR_INVALIDDATA; // packet type not audio

  1497.     }

  1498. 

  1499.     if (vc->mode_count == 1) {

  1500.         mode_number = 0;

  1501.     } else {

  1502.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1503.     }

  1504.     vc->mode_number = mode_number;

  1505.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1506. 

  1507.     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,

  1508.             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1509. 

  1510.     blockflag = vc->modes[mode_number].blockflag;

  1511.     blocksize = vc->blocksize[blockflag];

  1512.     vlen = blocksize / 2;

  1513.     if (blockflag)

  1514.         skip_bits(gb, 2); // previous_window, next_window

  1515. 

  1516.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?

  1517.     memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?

  1518. 

  1519. // Decode floor

  1520. 

  1521.     for (i = 0; i < vc->audio_channels; ++i) {

  1522.         vorbis_floor *floor;

  1523.         int ret;

  1524.         if (mapping->submaps > 1) {

  1525.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1526.         } else {

  1527.             floor = &vc->floors[mapping->submap_floor[0]];

  1528.         }

  1529. 

  1530.         ret = floor->decode(vc, &floor->data, ch_floor_ptr);

  1531. 

  1532.         if (ret < 0) {

  1533.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1534.             return AVERROR_INVALIDDATA;

  1535.         }

  1536.         no_residue[i] = ret;

  1537.         ch_floor_ptr += vlen;

  1538.     }

  1539. 

  1540. // Nonzero vector propagate

  1541. 

  1542.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1543.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1544.             no_residue[mapping->magnitude[i]] = 0;

  1545.             no_residue[mapping->angle[i]]     = 0;

  1546.         }

  1547.     }

  1548. 

  1549. // Decode residue

  1550. 

  1551.     for (i = 0; i < mapping->submaps; ++i) {

  1552.         vorbis_residue *residue;

  1553.         unsigned ch = 0;

  1554.         int ret;

  1555. 

  1556.         for (j = 0; j < vc->audio_channels; ++j) {

  1557.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1558.                 res_chan[j] = res_num;

  1559.                 if (no_residue[j]) {

  1560.                     do_not_decode[ch] = 1;

  1561.                 } else {

  1562.                     do_not_decode[ch] = 0;

  1563.                 }

  1564.                 ++ch;

  1565.                 ++res_num;

  1566.             }

  1567.         }

  1568.         residue = &vc->residues[mapping->submap_residue[i]];

  1569.         if (ch_left < ch) {

  1570.             av_log(vc->avccontext, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");

  1571.             return -1;

  1572.         }

  1573.         if (ch) {

  1574.             ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);

  1575.             if (ret < 0)

  1576.                 return ret;

  1577.         }

  1578. 

  1579.         ch_res_ptr += ch * vlen;

  1580.         ch_left -= ch;

  1581.     }

  1582. 

  1583. // Inverse coupling

  1584. 

  1585.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1586.         float *mag, *ang;

  1587. 

  1588.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

  1589.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1590.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1591.     }

  1592. 

  1593. // Dotproduct, MDCT

  1594. 

  1595.     mdct = &vc->mdct[blockflag];

  1596. 

  1597.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1598.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;

  1599.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1600.         vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);

  1601.         mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);

  1602.     }

  1603. 

  1604. // Overlap/add, save data for next overlapping  FPMATH

  1605. 

  1606.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

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

  1608.         unsigned bs0 = vc->blocksize[0];

  1609.         unsigned bs1 = vc->blocksize[1];

  1610.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1611.         float *saved      = vc->saved + j * bs1 / 4;

  1612.         float *ret        = vc->channel_floors + j * retlen;

  1613.         float *buf        = residue;

  1614.         const float *win  = vc->win[blockflag & previous_window];

  1615. 

  1616.         if (blockflag == previous_window) {

  1617.             vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);

  1618.         } else if (blockflag > previous_window) {

  1619.             vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);

  1620.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1621.         } else {

  1622.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1623.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);

  1624.         }

  1625.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1626.     }

  1627. 

  1628.     vc->previous_window = blockflag;

  1629.     return retlen;

  1630. }

  1631. 

  1632. // Return the decoded audio packet through the standard api

  1633. 

  1634. static int vorbis_decode_frame(AVCodecContext *avccontext, void *data,

  1635.                                int *got_frame_ptr, AVPacket *avpkt)

  1636. {

  1637.     const uint8_t *buf = avpkt->data;

  1638.     int buf_size       = avpkt->size;

  1639.     vorbis_context *vc = avccontext->priv_data;

  1640.     GetBitContext *gb = &vc->gb;

  1641.     const float *channel_ptrs[255];

  1642.     int i, len, ret;

  1643. 

  1644.     av_dlog(NULL, "packet length %d \n", buf_size);

  1645. 

  1646.     init_get_bits(gb, buf, buf_size*8);

  1647. 

  1648.     if ((len = vorbis_parse_audio_packet(vc)) <= 0)

  1649.         return len;

  1650. 

  1651.     if (!vc->first_frame) {

  1652.         vc->first_frame = 1;

  1653.         *got_frame_ptr = 0;

  1654.         return buf_size;

  1655.     }

  1656. 

  1657.     av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",

  1658.             get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);

  1659. 

  1660.     /* get output buffer */

  1661.     vc->frame.nb_samples = len;

  1662.     if ((ret = avccontext->get_buffer(avccontext, &vc->frame)) < 0) {

  1663.         av_log(avccontext, AV_LOG_ERROR, "get_buffer() failed\n");

  1664.         return ret;

  1665.     }

  1666. 

  1667.     if (vc->audio_channels > 8) {

  1668.         for (i = 0; i < vc->audio_channels; i++)

  1669.             channel_ptrs[i] = vc->channel_floors + i * len;

  1670.     } else {

  1671.         for (i = 0; i < vc->audio_channels; i++)

  1672.             channel_ptrs[i] = vc->channel_floors +

  1673.                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1674.     }

  1675. 

  1676.     if (avccontext->sample_fmt == AV_SAMPLE_FMT_FLT)

  1677.         vc->fmt_conv.float_interleave((float *)vc->frame.data[0], channel_ptrs,

  1678.                                       len, vc->audio_channels);

  1679.     else

  1680.         vc->fmt_conv.float_to_int16_interleave((int16_t *)vc->frame.data[0],

  1681.                                                channel_ptrs, len,

  1682.                                                vc->audio_channels);

  1683. 

  1684.     *got_frame_ptr   = 1;

  1685.     *(AVFrame *)data = vc->frame;

  1686. 

  1687.     return buf_size;

  1688. }

  1689. 

  1690. // Close decoder

  1691. 

  1692. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1693. {

  1694.     vorbis_context *vc = avccontext->priv_data;

  1695. 

  1696.     vorbis_free(vc);

  1697. 

  1698.     return 0;

  1699. }

  1700. 

  1701. AVCodec ff_vorbis_decoder = {

  1702.     .name           = "vorbis",

  1703.     .type           = AVMEDIA_TYPE_AUDIO,

  1704.     .id             = CODEC_ID_VORBIS,

  1705.     .priv_data_size = sizeof(vorbis_context),

  1706.     .init           = vorbis_decode_init,

  1707.     .close          = vorbis_decode_close,

  1708.     .decode         = vorbis_decode_frame,

  1709.     .capabilities   = CODEC_CAP_DR1,

  1710.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1711.     .channel_layouts = ff_vorbis_channel_layouts,

  1712.     .sample_fmts = (const enum AVSampleFormat[]) {

  1713.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE

  1714.     },

  1715. };