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.
48733 Commits
32 Branches
871MB
Tree: 2c16bf2de0
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '2c16bf2de0'
${ noResults }
FFmpeg/libavcodec/vorbisdec.c

1733 lines
64KB
Raw Blame History 

  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. /**

  24.  * @file

  25.  * Vorbis I decoder

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

  27.  */

  28. 

  29. #include <inttypes.h>

  30. #include <math.h>

  31. 

  32. #define BITSTREAM_READER_LE

  33. #include "libavutil/float_dsp.h"

  34. #include "libavutil/avassert.h"

  35. #include "avcodec.h"

  36. #include "get_bits.h"

  37. #include "dsputil.h"

  38. #include "fft.h"

  39. #include "fmtconvert.h"

  40. #include "internal.h"

  41. 

  42. #include "vorbis.h"

  43. #include "xiph.h"

  44. 

  45. #define V_NB_BITS 8

  46. #define V_NB_BITS2 11

  47. #define V_MAX_VLCS (1 << 16)

  48. #define V_MAX_PARTITIONS (1 << 20)

  49. 

  50. typedef struct {

  51.     uint8_t      dimensions;

  52.     uint8_t      lookup_type;

  53.     uint8_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.     uint8_t floor_type;

  68.     vorbis_floor_decode_func decode;

  69.     union vorbis_floor_u {

  70.         struct vorbis_floor0_s {

  71.             uint8_t       order;

  72.             uint16_t      rate;

  73.             uint16_t      bark_map_size;

  74.             int32_t      *map[2];

  75.             uint32_t      map_size[2];

  76.             uint8_t       amplitude_bits;

  77.             uint8_t       amplitude_offset;

  78.             uint8_t       num_books;

  79.             uint8_t      *book_list;

  80.             float        *lsp;

  81.         } t0;

  82.         struct vorbis_floor1_s {

  83.             uint8_t       partitions;

  84.             uint8_t       partition_class[32];

  85.             uint8_t       class_dimensions[16];

  86.             uint8_t       class_subclasses[16];

  87.             uint8_t       class_masterbook[16];

  88.             int16_t       subclass_books[16][8];

  89.             uint8_t       multiplier;

  90.             uint16_t      x_list_dim;

  91.             vorbis_floor1_entry *list;

  92.         } t1;

  93.     } data;

  94. } vorbis_floor;

  95. 

  96. typedef struct {

  97.     uint16_t      type;

  98.     uint32_t      begin;

  99.     uint32_t      end;

  100.     unsigned      partition_size;

  101.     uint8_t       classifications;

  102.     uint8_t       classbook;

  103.     int16_t       books[64][8];

  104.     uint8_t       maxpass;

  105.     uint16_t      ptns_to_read;

  106.     uint8_t      *classifs;

  107. } vorbis_residue;

  108. 

  109. typedef struct {

  110.     uint8_t       submaps;

  111.     uint16_t      coupling_steps;

  112.     uint8_t      *magnitude;

  113.     uint8_t      *angle;

  114.     uint8_t      *mux;

  115.     uint8_t       submap_floor[16];

  116.     uint8_t       submap_residue[16];

  117. } vorbis_mapping;

  118. 

  119. typedef struct {

  120.     uint8_t       blockflag;

  121.     uint16_t      windowtype;

  122.     uint16_t      transformtype;

  123.     uint8_t       mapping;

  124. } vorbis_mode;

  125. 

  126. typedef struct vorbis_context_s {

  127.     AVCodecContext *avccontext;

  128.     AVFrame frame;

  129.     GetBitContext gb;

  130.     DSPContext dsp;

  131.     AVFloatDSPContext fdsp;

  132.     FmtConvertContext fmt_conv;

  133. 

  134.     FFTContext mdct[2];

  135.     uint8_t       first_frame;

  136.     uint32_t      version;

  137.     uint8_t       audio_channels;

  138.     uint32_t      audio_samplerate;

  139.     uint32_t      bitrate_maximum;

  140.     uint32_t      bitrate_nominal;

  141.     uint32_t      bitrate_minimum;

  142.     uint32_t      blocksize[2];

  143.     const float  *win[2];

  144.     uint16_t      codebook_count;

  145.     vorbis_codebook *codebooks;

  146.     uint8_t       floor_count;

  147.     vorbis_floor *floors;

  148.     uint8_t       residue_count;

  149.     vorbis_residue *residues;

  150.     uint8_t       mapping_count;

  151.     vorbis_mapping *mappings;

  152.     uint8_t       mode_count;

  153.     vorbis_mode  *modes;

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

  155.     uint8_t       previous_window;

  156.     float        *channel_residues;

  157.     float        *saved;

  158. } vorbis_context;

  159. 

  160. /* Helper functions */

  161. 

  162. #define BARK(x) \

  163.     (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))

  164. 

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

  166. #define VALIDATE_INDEX(idx, limit) \

  167.     if (idx >= limit) {\

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

  169.                idx_err_str,\

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

  171.         return AVERROR_INVALIDDATA;\

  172.     }

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

  174.     {\

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

  176.         VALIDATE_INDEX(idx, limit)\

  177.     }

  178. 

  179. static float vorbisfloat2float(unsigned val)

  180. {

  181.     double mant = val & 0x1fffff;

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

  183.     if (val & 0x80000000)

  184.         mant = -mant;

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

  186. }

  187. 

  188. 

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

  190. 

  191. static void vorbis_free(vorbis_context *vc)

  192. {

  193.     int i;

  194. 

  195.     av_freep(&vc->channel_residues);

  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.         ff_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.     unsigned cb;

  239.     uint8_t  *tmp_vlc_bits;

  240.     uint32_t *tmp_vlc_codes;

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

  242.     uint16_t *codebook_multiplicands;

  243.     int ret = 0;

  244. 

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

  246. 

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

  248. 

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

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

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

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

  253. 

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

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

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

  257. 

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

  259. 

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

  261.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  263.             ret = AVERROR_INVALIDDATA;

  264.             goto error;

  265.         }

  266. 

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

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

  269.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  271.                    cb, codebook_setup->dimensions);

  272.             ret = AVERROR_INVALIDDATA;

  273.             goto error;

  274.         }

  275.         entries = get_bits(gb, 24);

  276.         if (entries > V_MAX_VLCS) {

  277.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  279.                    cb, entries);

  280.             ret = AVERROR_INVALIDDATA;

  281.             goto error;

  282.         }

  283. 

  284.         ordered = get_bits1(gb);

  285. 

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

  287.                 codebook_setup->dimensions, entries);

  288. 

  289.         if (!ordered) {

  290.             unsigned ce, flag;

  291.             unsigned sparse = get_bits1(gb);

  292. 

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

  294. 

  295.             if (sparse) {

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

  297. 

  298.                 used_entries = 0;

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

  300.                     flag = get_bits1(gb);

  301.                     if (flag) {

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

  303.                         ++used_entries;

  304.                     } else

  305.                         tmp_vlc_bits[ce] = 0;

  306.                 }

  307.             } else {

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

  309. 

  310.                 used_entries = entries;

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

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

  313.             }

  314.         } else {

  315.             unsigned current_entry  = 0;

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

  317. 

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

  319. 

  320.             used_entries = entries;

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

  322.                 unsigned i, number;

  323. 

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

  325. 

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

  327. 

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

  329. 

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

  331.                     if (i < used_entries)

  332.                         tmp_vlc_bits[i] = current_length;

  333. 

  334.                 current_entry+=number;

  335.             }

  336.             if (current_entry>used_entries) {

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

  338.                 ret = AVERROR_INVALIDDATA;

  339.                 goto error;

  340.             }

  341.         }

  342. 

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

  344. 

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

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

  347. 

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

  349. 

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

  351.             unsigned i, j, k;

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

  353. 

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

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

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

  357.             unsigned codebook_sequence_p = get_bits1(gb);

  358. 

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

  360.                     codebook_lookup_values);

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

  362.                     codebook_delta_value, codebook_minimum_value);

  363. 

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

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

  366. 

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

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

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

  370.             }

  371. 

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

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

  374.                                                                     codebook_setup->dimensions *

  375.                                                                     sizeof(*codebook_setup->codevectors))

  376.                                                        : NULL;

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

  378.                 unsigned dim = codebook_setup->dimensions;

  379. 

  380.                 if (tmp_vlc_bits[i]) {

  381.                     float last = 0.0;

  382.                     unsigned lookup_offset = i;

  383. 

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

  385. 

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

  387.                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  389.                         if (codebook_sequence_p)

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

  391.                         lookup_offset/=codebook_lookup_values;

  392.                     }

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

  394. 

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

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

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

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

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

  400. 

  401.                     ++j;

  402.                 }

  403.             }

  404.             if (j != used_entries) {

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

  406.                 ret = AVERROR_INVALIDDATA;

  407.                 goto error;

  408.             }

  409.             entries = used_entries;

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

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

  412.             ret = AVERROR_INVALIDDATA;

  413.             goto error;

  414.         }

  415. 

  416. // Initialize VLC table

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

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

  419.             ret = AVERROR_INVALIDDATA;

  420.             goto error;

  421.         }

  422.         codebook_setup->maxdepth = 0;

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

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

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

  426. 

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

  428.             codebook_setup->nb_bits = V_NB_BITS2;

  429.         else

  430.             codebook_setup->nb_bits = V_NB_BITS;

  431. 

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

  433. 

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

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

  436.                             sizeof(*tmp_vlc_bits), tmp_vlc_codes,

  437.                             sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),

  438.                             INIT_VLC_LE))) {

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

  440.             goto error;

  441.         }

  442.     }

  443. 

  444.     av_free(tmp_vlc_bits);

  445.     av_free(tmp_vlc_codes);

  446.     av_free(codebook_multiplicands);

  447.     return 0;

  448. 

  449. // Error:

  450. error:

  451.     av_free(tmp_vlc_bits);

  452.     av_free(tmp_vlc_codes);

  453.     av_free(codebook_multiplicands);

  454.     return ret;

  455. }

  456. 

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

  458. 

  459. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  460. {

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

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

  463. 

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

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

  466. 

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

  468.                 vorbis_time_count, vorbis_tdtransform);

  469. 

  470.         if (vorbis_tdtransform) {

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

  472.             return AVERROR_INVALIDDATA;

  473.         }

  474.     }

  475.     return 0;

  476. }

  477. 

  478. // Process floors part

  479. 

  480. static int vorbis_floor0_decode(vorbis_context *vc,

  481.                                 vorbis_floor_data *vfu, float *vec);

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

  483. static int vorbis_floor1_decode(vorbis_context *vc,

  484.                                 vorbis_floor_data *vfu, float *vec);

  485. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  486. {

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

  488.     int i,j,k;

  489. 

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

  491. 

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

  493. 

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

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

  496. 

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

  498. 

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

  500. 

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

  502.             int maximum_class = -1;

  503.             unsigned rangebits, rangemax, floor1_values = 2;

  504. 

  505.             floor_setup->decode = vorbis_floor1_decode;

  506. 

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

  508. 

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

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

  511. 

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

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

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

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

  516. 

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

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

  519. 

  520.             }

  521. 

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

  523. 

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

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

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

  527. 

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

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

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

  531. 

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

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

  534. 

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

  536.                 }

  537. 

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

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

  540.                     if (bits != -1)

  541.                         VALIDATE_INDEX(bits, vc->codebook_count)

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

  543. 

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

  545.                 }

  546.             }

  547. 

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

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

  550. 

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

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

  553. 

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

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

  556. 

  557. 

  558.             rangebits = get_bits(gb, 4);

  559.             rangemax = (1 << rangebits);

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

  561.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

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

  564.                 return AVERROR_INVALIDDATA;

  565.             }

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

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

  568. 

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

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

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

  572. 

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

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

  575.                 }

  576.             }

  577. 

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

  579.             if (ff_vorbis_ready_floor1_list(vc->avccontext,

  580.                                             floor_setup->data.t1.list,

  581.                                             floor_setup->data.t1.x_list_dim)) {

  582.                 return AVERROR_INVALIDDATA;

  583.             }

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

  585.             unsigned max_codebook_dim = 0;

  586. 

  587.             floor_setup->decode = vorbis_floor0_decode;

  588. 

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

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

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

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

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

  594.              * 2^0 - 1 == 0                             */

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

  596.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

  598.                 return AVERROR_INVALIDDATA;

  599.             }

  600.             if (floor_setup->data.t0.bark_map_size == 0) {

  601.                 av_log(vc->avccontext, AV_LOG_ERROR, "Floor 0 bark map size is 0.\n");

  602.                 return AVERROR_INVALIDDATA;

  603.             }

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

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

  606. 

  607.             /* allocate mem for booklist */

  608.             floor_setup->data.t0.book_list =

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

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

  611.                 return AVERROR(ENOMEM);

  612.             /* read book indexes */

  613.             {

  614.                 int idx;

  615.                 unsigned book_idx;

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

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

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

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

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

  621.                 }

  622.             }

  623. 

  624.             create_map(vc, i);

  625. 

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

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

  628.             floor_setup->data.t0.lsp =

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

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

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

  632.                 return AVERROR(ENOMEM);

  633. 

  634.             /* debug output parsed headers */

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

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

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

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

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

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

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

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

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

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

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

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

  647.             {

  648.                 int idx;

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

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

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

  652.                 }

  653.             }

  654.         } else {

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

  656.             return AVERROR_INVALIDDATA;

  657.         }

  658.     }

  659.     return 0;

  660. }

  661. 

  662. // Process residues part

  663. 

  664. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  665. {

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

  667.     unsigned i, j, k;

  668. 

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

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

  671. 

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

  673. 

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

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

  676.         uint8_t cascade[64];

  677.         unsigned high_bits, low_bits;

  678. 

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

  680. 

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

  682. 

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

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

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

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

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

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

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

  690.             av_log(vc->avccontext, AV_LOG_ERROR,

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

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

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

  694.             return AVERROR_INVALIDDATA;

  695.         }

  696. 

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

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

  699. 

  700.         res_setup->ptns_to_read =

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

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

  703.                                         vc->audio_channels *

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

  705.         if (!res_setup->classifs)

  706.             return AVERROR(ENOMEM);

  707. 

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

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

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

  711. 

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

  713.             high_bits = 0;

  714.             low_bits  = get_bits(gb, 3);

  715.             if (get_bits1(gb))

  716.                 high_bits = get_bits(gb, 5);

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

  718. 

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

  720.         }

  721. 

  722.         res_setup->maxpass = 0;

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

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

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

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

  727. 

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

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

  730. 

  731.                     if (k>res_setup->maxpass)

  732.                         res_setup->maxpass = k;

  733.                 } else {

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

  735.                 }

  736.             }

  737.         }

  738.     }

  739.     return 0;

  740. }

  741. 

  742. // Process mappings part

  743. 

  744. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  745. {

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

  747.     unsigned i, j;

  748. 

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

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

  751. 

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

  753. 

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

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

  756. 

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

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

  759.             return AVERROR_INVALIDDATA;

  760.         }

  761.         if (get_bits1(gb)) {

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

  763.         } else {

  764.             mapping_setup->submaps = 1;

  765.         }

  766. 

  767.         if (get_bits1(gb)) {

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

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

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

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

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

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

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

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

  776.             }

  777.         } else {

  778.             mapping_setup->coupling_steps = 0;

  779.         }

  780. 

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

  782.                 i, mapping_setup->coupling_steps);

  783. 

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

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

  786.             return AVERROR_INVALIDDATA; // following spec.

  787.         }

  788. 

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

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

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

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

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

  794.         }

  795. 

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

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

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

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

  800. 

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

  802.                     mapping_setup->submap_floor[j],

  803.                     mapping_setup->submap_residue[j]);

  804.         }

  805.     }

  806.     return 0;

  807. }

  808. 

  809. // Process modes part

  810. 

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

  812. {

  813.     vorbis_floor *floors = vc->floors;

  814.     vorbis_floor0 *vf;

  815.     int idx;

  816.     int blockflag, n;

  817.     int32_t *map;

  818. 

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

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

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

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

  823. 

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

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

  826. 

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

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

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

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

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

  832.         }

  833.         map[n] = -1;

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

  835.     }

  836. 

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

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

  839.     }

  840. }

  841. 

  842. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  843. {

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

  845.     unsigned i;

  846. 

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

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

  849. 

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

  851. 

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

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

  854. 

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

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

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

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

  859. 

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

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

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

  863.     }

  864.     return 0;

  865. }

  866. 

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

  868. 

  869. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  870. {

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

  872.     int ret;

  873. 

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

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

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

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

  878.         return AVERROR_INVALIDDATA;

  879.     }

  880. 

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

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

  883.         return ret;

  884.     }

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

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

  887.         return ret;

  888.     }

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

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

  891.         return ret;

  892.     }

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

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

  895.         return ret;

  896.     }

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

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

  899.         return ret;

  900.     }

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

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

  903.         return ret;

  904.     }

  905.     if (!get_bits1(gb)) {

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

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

  908.     }

  909. 

  910.     return 0;

  911. }

  912. 

  913. // Process the identification header

  914. 

  915. static int vorbis_parse_id_hdr(vorbis_context *vc)

  916. {

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

  918.     unsigned bl0, bl1;

  919. 

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

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

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

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

  924.         return AVERROR_INVALIDDATA;

  925.     }

  926. 

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

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

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

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

  931.         return AVERROR_INVALIDDATA;

  932.     }

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

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

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

  936.         return AVERROR_INVALIDDATA;

  937.     }

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

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

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

  941.     bl0 = get_bits(gb, 4);

  942.     bl1 = get_bits(gb, 4);

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

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

  945.         return AVERROR_INVALIDDATA;

  946.     }

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

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

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

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

  951. 

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

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

  954.         return AVERROR_INVALIDDATA;

  955.     }

  956. 

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

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

  959.     vc->previous_window  = 0;

  960. 

  961.     ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0);

  962.     ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0);

  963. 

  964.     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 ",

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

  966. 

  967. /*

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

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

  970.         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)));

  971.     }

  972. */

  973. 

  974.     return 0;

  975. }

  976. 

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

  978. 

  979. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  980. {

  981.     vorbis_context *vc = avccontext->priv_data;

  982.     uint8_t *headers   = avccontext->extradata;

  983.     int headers_len    = avccontext->extradata_size;

  984.     uint8_t *header_start[3];

  985.     int header_len[3];

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

  987.     int hdr_type, ret;

  988. 

  989.     vc->avccontext = avccontext;

  990.     ff_dsputil_init(&vc->dsp, avccontext);

  991.     avpriv_float_dsp_init(&vc->fdsp, avccontext->flags & CODEC_FLAG_BITEXACT);

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

  993. 

  994.     avccontext->sample_fmt = AV_SAMPLE_FMT_FLTP;

  995. 

  996.     if (!headers_len) {

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

  998.         return AVERROR_INVALIDDATA;

  999.     }

  1000. 

  1001.     if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {

  1002.         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");

  1003.         return ret;

  1004.     }

  1005. 

  1006.     init_get_bits(gb, header_start[0], header_len[0]*8);

  1007.     hdr_type = get_bits(gb, 8);

  1008.     if (hdr_type != 1) {

  1009.         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");

  1010.         return AVERROR_INVALIDDATA;

  1011.     }

  1012.     if ((ret = vorbis_parse_id_hdr(vc))) {

  1013.         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");

  1014.         vorbis_free(vc);

  1015.         return ret;

  1016.     }

  1017. 

  1018.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1019.     hdr_type = get_bits(gb, 8);

  1020.     if (hdr_type != 5) {

  1021.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1022.         vorbis_free(vc);

  1023.         return AVERROR_INVALIDDATA;

  1024.     }

  1025.     if ((ret = vorbis_parse_setup_hdr(vc))) {

  1026.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1027.         vorbis_free(vc);

  1028.         return ret;

  1029.     }

  1030. 

  1031.     if (vc->audio_channels > 8)

  1032.         avccontext->channel_layout = 0;

  1033.     else

  1034.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1035. 

  1036.     avccontext->channels    = vc->audio_channels;

  1037.     avccontext->sample_rate = vc->audio_samplerate;

  1038. 

  1039.     avcodec_get_frame_defaults(&vc->frame);

  1040.     avccontext->coded_frame = &vc->frame;

  1041. 

  1042.     return 0;

  1043. }

  1044. 

  1045. // Decode audiopackets -------------------------------------------------

  1046. 

  1047. // Read and decode floor

  1048. 

  1049. static int vorbis_floor0_decode(vorbis_context *vc,

  1050.                                 vorbis_floor_data *vfu, float *vec)

  1051. {

  1052.     vorbis_floor0 *vf = &vfu->t0;

  1053.     float *lsp = vf->lsp;

  1054.     unsigned amplitude, book_idx;

  1055.     unsigned blockflag = vc->modes[vc->mode_number].blockflag;

  1056. 

  1057.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1058.     if (amplitude > 0) {

  1059.         float last = 0;

  1060.         unsigned idx, lsp_len = 0;

  1061.         vorbis_codebook codebook;

  1062. 

  1063.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1064.         if (book_idx >= vf->num_books) {

  1065.             av_log(vc->avccontext, AV_LOG_ERROR,

  1066.                     "floor0 dec: booknumber too high!\n");

  1067.             book_idx =  0;

  1068.         }

  1069.         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);

  1070.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1071.         /* Invalid codebook! */

  1072.         if (!codebook.codevectors)

  1073.             return AVERROR_INVALIDDATA;

  1074. 

  1075.         while (lsp_len<vf->order) {

  1076.             int vec_off;

  1077. 

  1078.             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);

  1079.             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1080.             /* read temp vector */

  1081.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1082.                                codebook.nb_bits, codebook.maxdepth)

  1083.                       * codebook.dimensions;

  1084.             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);

  1085.             /* copy each vector component and add last to it */

  1086.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1087.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1088.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1089. 

  1090.             lsp_len += codebook.dimensions;

  1091.         }

  1092.         /* DEBUG: output lsp coeffs */

  1093.         {

  1094.             int idx;

  1095.             for (idx = 0; idx < lsp_len; ++idx)

  1096.                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1097.         }

  1098. 

  1099.         /* synthesize floor output vector */

  1100.         {

  1101.             int i;

  1102.             int order = vf->order;

  1103.             float wstep = M_PI / vf->bark_map_size;

  1104. 

  1105.             for (i = 0; i < order; i++)

  1106.                 lsp[i] = 2.0f * cos(lsp[i]);

  1107. 

  1108.             av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",

  1109.                     vf->map_size[blockflag], order, wstep);

  1110. 

  1111.             i = 0;

  1112.             while (i < vf->map_size[blockflag]) {

  1113.                 int j, iter_cond = vf->map[blockflag][i];

  1114.                 float p = 0.5f;

  1115.                 float q = 0.5f;

  1116.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1117. 

  1118.                 /* similar part for the q and p products */

  1119.                 for (j = 0; j + 1 < order; j += 2) {

  1120.                     q *= lsp[j]     - two_cos_w;

  1121.                     p *= lsp[j + 1] - two_cos_w;

  1122.                 }

  1123.                 if (j == order) { // even order

  1124.                     p *= p * (2.0f - two_cos_w);

  1125.                     q *= q * (2.0f + two_cos_w);

  1126.                 } else { // odd order

  1127.                     q *= two_cos_w-lsp[j]; // one more time for q

  1128. 

  1129.                     /* final step and square */

  1130.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1131.                     q *= q;

  1132.                 }

  1133. 

  1134.                 /* calculate linear floor value */

  1135.                 q = exp((((amplitude*vf->amplitude_offset) /

  1136.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1137.                          - vf->amplitude_offset) * .11512925f);

  1138. 

  1139.                 /* fill vector */

  1140.                 do {

  1141.                     vec[i] = q; ++i;

  1142.                 } while (vf->map[blockflag][i] == iter_cond);

  1143.             }

  1144.         }

  1145.     } else {

  1146.         /* this channel is unused */

  1147.         return 1;

  1148.     }

  1149. 

  1150.     av_dlog(NULL, " Floor0 decoded\n");

  1151. 

  1152.     return 0;

  1153. }

  1154. 

  1155. static int vorbis_floor1_decode(vorbis_context *vc,

  1156.                                 vorbis_floor_data *vfu, float *vec)

  1157. {

  1158.     vorbis_floor1 *vf = &vfu->t1;

  1159.     GetBitContext *gb = &vc->gb;

  1160.     uint16_t range_v[4] = { 256, 128, 86, 64 };

  1161.     unsigned range = range_v[vf->multiplier - 1];

  1162.     uint16_t floor1_Y[258];

  1163.     uint16_t floor1_Y_final[258];

  1164.     int floor1_flag[258];

  1165.     unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;

  1166.     int book, adx, ady, dy, off, predicted, err;

  1167. 

  1168. 

  1169.     if (!get_bits1(gb)) // silence

  1170.         return 1;

  1171. 

  1172. // Read values (or differences) for the floor's points

  1173. 

  1174.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1175.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1176. 

  1177.     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1178. 

  1179.     offset = 2;

  1180.     for (i = 0; i < vf->partitions; ++i) {

  1181.         partition_class = vf->partition_class[i];

  1182.         cdim   = vf->class_dimensions[partition_class];

  1183.         cbits  = vf->class_subclasses[partition_class];

  1184.         csub = (1 << cbits) - 1;

  1185.         cval = 0;

  1186. 

  1187.         av_dlog(NULL, "Cbits %u\n", cbits);

  1188. 

  1189.         if (cbits) // this reads all subclasses for this partition's class

  1190.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,

  1191.                             vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);

  1192. 

  1193.         for (j = 0; j < cdim; ++j) {

  1194.             book = vf->subclass_books[partition_class][cval & csub];

  1195. 

  1196.             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",

  1197.                     book, cbits, cval, get_bits_count(gb));

  1198. 

  1199.             cval = cval >> cbits;

  1200.             if (book > -1) {

  1201.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1202.                 vc->codebooks[book].nb_bits, 3);

  1203.             } else {

  1204.                 floor1_Y[offset+j] = 0;

  1205.             }

  1206. 

  1207.             av_dlog(NULL, " floor(%d) = %d \n",

  1208.                     vf->list[offset+j].x, floor1_Y[offset+j]);

  1209.         }

  1210.         offset+=cdim;

  1211.     }

  1212. 

  1213. // Amplitude calculation from the differences

  1214. 

  1215.     floor1_flag[0] = 1;

  1216.     floor1_flag[1] = 1;

  1217.     floor1_Y_final[0] = floor1_Y[0];

  1218.     floor1_Y_final[1] = floor1_Y[1];

  1219. 

  1220.     for (i = 2; i < vf->x_list_dim; ++i) {

  1221.         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;

  1222. 

  1223.         low_neigh_offs  = vf->list[i].low;

  1224.         high_neigh_offs = vf->list[i].high;

  1225.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1226.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1227.         ady = FFABS(dy);

  1228.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1229.         off = err / adx;

  1230.         if (dy < 0) {

  1231.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1232.         } else {

  1233.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1234.         } // render_point end

  1235. 

  1236.         val = floor1_Y[i];

  1237.         highroom = range-predicted;

  1238.         lowroom  = predicted;

  1239.         if (highroom < lowroom) {

  1240.             room = highroom * 2;

  1241.         } else {

  1242.             room = lowroom * 2;   // SPEC misspelling

  1243.         }

  1244.         if (val) {

  1245.             floor1_flag[low_neigh_offs]  = 1;

  1246.             floor1_flag[high_neigh_offs] = 1;

  1247.             floor1_flag[i]               = 1;

  1248.             if (val >= room) {

  1249.                 if (highroom > lowroom) {

  1250.                     floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);

  1251.                 } else {

  1252.                     floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);

  1253.                 }

  1254.             } else {

  1255.                 if (val & 1) {

  1256.                     floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);

  1257.                 } else {

  1258.                     floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);

  1259.                 }

  1260.             }

  1261.         } else {

  1262.             floor1_flag[i]    = 0;

  1263.             floor1_Y_final[i] = av_clip_uint16(predicted);

  1264.         }

  1265. 

  1266.         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",

  1267.                 vf->list[i].x, floor1_Y_final[i], val);

  1268.     }

  1269. 

  1270. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1271. 

  1272.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1273. 

  1274.     av_dlog(NULL, " Floor decoded\n");

  1275. 

  1276.     return 0;

  1277. }

  1278. 

  1279. // Read and decode residue

  1280. 

  1281. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1282.                                                            vorbis_residue *vr,

  1283.                                                            unsigned ch,

  1284.                                                            uint8_t *do_not_decode,

  1285.                                                            float *vec,

  1286.                                                            unsigned vlen,

  1287.                                                            unsigned ch_left,

  1288.                                                            int vr_type)

  1289. {

  1290.     GetBitContext *gb = &vc->gb;

  1291.     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;

  1292.     unsigned ptns_to_read = vr->ptns_to_read;

  1293.     uint8_t *classifs = vr->classifs;

  1294.     unsigned pass, ch_used, i, j, k, l;

  1295.     unsigned max_output = (ch - 1) * vlen;

  1296. 

  1297.     if (vr_type == 2) {

  1298.         for (j = 1; j < ch; ++j)

  1299.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1300.         if (do_not_decode[0])

  1301.             return 0;

  1302.         ch_used = 1;

  1303.         max_output += vr->end / ch;

  1304.     } else {

  1305.         ch_used = ch;

  1306.         max_output += vr->end;

  1307.     }

  1308. 

  1309.     if (max_output > ch_left * vlen) {

  1310.         av_log(vc->avccontext, AV_LOG_ERROR, "Insufficient output buffer\n");

  1311.         return -1;

  1312.     }

  1313. 

  1314.     av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1315. 

  1316.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1317.         uint16_t voffset, partition_count, j_times_ptns_to_read;

  1318. 

  1319.         voffset = vr->begin;

  1320.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1321.             if (!pass) {

  1322.                 unsigned inverse_class = ff_inverse[vr->classifications];

  1323.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1324.                     if (!do_not_decode[j]) {

  1325.                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1326.                                                  vc->codebooks[vr->classbook].nb_bits, 3);

  1327. 

  1328.                         av_dlog(NULL, "Classword: %u\n", temp);

  1329. 

  1330.                         av_assert0(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1331.                         for (i = 0; i < c_p_c; ++i) {

  1332.                             unsigned temp2;

  1333. 

  1334.                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;

  1335.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1336.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1337.                             temp = temp2;

  1338.                         }

  1339.                     }

  1340.                     j_times_ptns_to_read += ptns_to_read;

  1341.                 }

  1342.             }

  1343.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1344.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1345.                     unsigned voffs;

  1346. 

  1347.                     if (!do_not_decode[j]) {

  1348.                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];

  1349.                         int vqbook  = vr->books[vqclass][pass];

  1350. 

  1351.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1352.                             unsigned coffs;

  1353.                             unsigned dim  = vc->codebooks[vqbook].dimensions;

  1354.                             unsigned step = FASTDIV(vr->partition_size << 1, dim << 1);

  1355.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1356. 

  1357.                             if (vr_type == 0) {

  1358. 

  1359.                                 voffs = voffset+j*vlen;

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

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

  1362.                                     for (l = 0; l < dim; ++l)

  1363.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];

  1364.                                 }

  1365.                             } else if (vr_type == 1) {

  1366.                                 voffs = voffset + j * vlen;

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

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

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

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

  1371. 

  1372.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d  \n",

  1373.                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1374.                                     }

  1375.                                 }

  1376.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1377.                                 voffs = voffset >> 1;

  1378. 

  1379.                                 if (dim == 2) {

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

  1381.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1382.                                         vec[voffs + k       ] += codebook.codevectors[coffs    ];

  1383.                                         vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];

  1384.                                     }

  1385.                                 } else if (dim == 4) {

  1386.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1387.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1388.                                         vec[voffs           ] += codebook.codevectors[coffs    ];

  1389.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];

  1390.                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];

  1391.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];

  1392.                                     }

  1393.                                 } else

  1394.                                 for (k = 0; k < step; ++k) {

  1395.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1396.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1397.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];

  1398.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];

  1399. 

  1400.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1401.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1402.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1403.                                                 codebook.codevectors[coffs + l], coffs, l);

  1404.                                     }

  1405.                                 }

  1406. 

  1407.                             } else if (vr_type == 2) {

  1408.                                 unsigned voffs_div = FASTDIV(voffset << 1, ch <<1);

  1409.                                 unsigned voffs_mod = voffset - voffs_div * ch;

  1410. 

  1411.                                 for (k = 0; k < step; ++k) {

  1412.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1413.                                     for (l = 0; l < dim; ++l) {

  1414.                                         vec[voffs_div + voffs_mod * vlen] +=

  1415.                                             codebook.codevectors[coffs + l];

  1416. 

  1417.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1418.                                                 pass, voffs_div + voffs_mod * vlen,

  1419.                                                 vec[voffs_div + voffs_mod * vlen],

  1420.                                                 codebook.codevectors[coffs + l], coffs, l);

  1421. 

  1422.                                         if (++voffs_mod == ch) {

  1423.                                             voffs_div++;

  1424.                                             voffs_mod = 0;

  1425.                                         }

  1426.                                     }

  1427.                                 }

  1428.                             }

  1429.                         }

  1430.                     }

  1431.                     j_times_ptns_to_read += ptns_to_read;

  1432.                 }

  1433.                 ++partition_count;

  1434.                 voffset += vr->partition_size;

  1435.             }

  1436.         }

  1437.     }

  1438.     return 0;

  1439. }

  1440. 

  1441. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1442.                                         unsigned ch,

  1443.                                         uint8_t *do_not_decode,

  1444.                                         float *vec, unsigned vlen,

  1445.                                         unsigned ch_left)

  1446. {

  1447.     if (vr->type == 2)

  1448.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);

  1449.     else if (vr->type == 1)

  1450.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);

  1451.     else if (vr->type == 0)

  1452.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);

  1453.     else {

  1454.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1455.         return AVERROR_INVALIDDATA;

  1456.     }

  1457. }

  1458. 

  1459. void ff_vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1460. {

  1461.     int i;

  1462.     for (i = 0;  i < blocksize;  i++) {

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

  1464.             if (ang[i] > 0.0) {

  1465.                 ang[i] = mag[i] - ang[i];

  1466.             } else {

  1467.                 float temp = ang[i];

  1468.                 ang[i]     = mag[i];

  1469.                 mag[i]    += temp;

  1470.             }

  1471.         } else {

  1472.             if (ang[i] > 0.0) {

  1473.                 ang[i] += mag[i];

  1474.             } else {

  1475.                 float temp = ang[i];

  1476.                 ang[i]     = mag[i];

  1477.                 mag[i]    -= temp;

  1478.             }

  1479.         }

  1480.     }

  1481. }

  1482. 

  1483. // Decode the audio packet using the functions above

  1484. 

  1485. static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr)

  1486. {

  1487.     GetBitContext *gb = &vc->gb;

  1488.     FFTContext *mdct;

  1489.     unsigned previous_window = vc->previous_window;

  1490.     unsigned mode_number, blockflag, blocksize;

  1491.     int i, j;

  1492.     uint8_t no_residue[255];

  1493.     uint8_t do_not_decode[255];

  1494.     vorbis_mapping *mapping;

  1495.     float *ch_res_ptr   = vc->channel_residues;

  1496.     uint8_t res_chan[255];

  1497.     unsigned res_num = 0;

  1498.     int retlen  = 0;

  1499.     unsigned ch_left = vc->audio_channels;

  1500.     unsigned vlen;

  1501. 

  1502.     if (get_bits1(gb)) {

  1503.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1504.         return AVERROR_INVALIDDATA; // packet type not audio

  1505.     }

  1506. 

  1507.     if (vc->mode_count == 1) {

  1508.         mode_number = 0;

  1509.     } else {

  1510.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1511.     }

  1512.     vc->mode_number = mode_number;

  1513.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1514. 

  1515.     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,

  1516.             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1517. 

  1518.     blockflag = vc->modes[mode_number].blockflag;

  1519.     blocksize = vc->blocksize[blockflag];

  1520.     vlen = blocksize / 2;

  1521.     if (blockflag) {

  1522.         previous_window = get_bits(gb, 1);

  1523.         skip_bits1(gb); // next_window

  1524.     }

  1525. 

  1526.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?

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

  1528.         memset(floor_ptr[i], 0, vlen * sizeof(floor_ptr[0][0])); //FIXME can this be removed ?

  1529. 

  1530. // Decode floor

  1531. 

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

  1533.         vorbis_floor *floor;

  1534.         int ret;

  1535.         if (mapping->submaps > 1) {

  1536.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1537.         } else {

  1538.             floor = &vc->floors[mapping->submap_floor[0]];

  1539.         }

  1540. 

  1541.         ret = floor->decode(vc, &floor->data, floor_ptr[i]);

  1542. 

  1543.         if (ret < 0) {

  1544.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1545.             return AVERROR_INVALIDDATA;

  1546.         }

  1547.         no_residue[i] = ret;

  1548.     }

  1549. 

  1550. // Nonzero vector propagate

  1551. 

  1552.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1553.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1554.             no_residue[mapping->magnitude[i]] = 0;

  1555.             no_residue[mapping->angle[i]]     = 0;

  1556.         }

  1557.     }

  1558. 

  1559. // Decode residue

  1560. 

  1561.     for (i = 0; i < mapping->submaps; ++i) {

  1562.         vorbis_residue *residue;

  1563.         unsigned ch = 0;

  1564.         int ret;

  1565. 

  1566.         for (j = 0; j < vc->audio_channels; ++j) {

  1567.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1568.                 res_chan[j] = res_num;

  1569.                 if (no_residue[j]) {

  1570.                     do_not_decode[ch] = 1;

  1571.                 } else {

  1572.                     do_not_decode[ch] = 0;

  1573.                 }

  1574.                 ++ch;

  1575.                 ++res_num;

  1576.             }

  1577.         }

  1578.         residue = &vc->residues[mapping->submap_residue[i]];

  1579.         if (ch_left < ch) {

  1580.             av_log(vc->avccontext, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");

  1581.             return -1;

  1582.         }

  1583.         if (ch) {

  1584.             ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);

  1585.             if (ret < 0)

  1586.                 return ret;

  1587.         }

  1588. 

  1589.         ch_res_ptr += ch * vlen;

  1590.         ch_left -= ch;

  1591.     }

  1592. 

  1593.     if (ch_left > 0)

  1594.         return AVERROR_INVALIDDATA;

  1595. 

  1596. // Inverse coupling

  1597. 

  1598.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1599.         float *mag, *ang;

  1600. 

  1601.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

  1602.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1603.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1604.     }

  1605. 

  1606. // Dotproduct, MDCT

  1607. 

  1608.     mdct = &vc->mdct[blockflag];

  1609. 

  1610.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1611.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1612.         vc->fdsp.vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);

  1613.         mdct->imdct_half(mdct, ch_res_ptr, floor_ptr[j]);

  1614.     }

  1615. 

  1616. // Overlap/add, save data for next overlapping

  1617. 

  1618.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

  1619.     for (j = 0; j < vc->audio_channels; j++) {

  1620.         unsigned bs0 = vc->blocksize[0];

  1621.         unsigned bs1 = vc->blocksize[1];

  1622.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1623.         float *saved      = vc->saved + j * bs1 / 4;

  1624.         float *ret        = floor_ptr[j];

  1625.         float *buf        = residue;

  1626.         const float *win  = vc->win[blockflag & previous_window];

  1627. 

  1628.         if (blockflag == previous_window) {

  1629.             vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);

  1630.         } else if (blockflag > previous_window) {

  1631.             vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);

  1632.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1633.         } else {

  1634.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1635.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);

  1636.         }

  1637.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1638.     }

  1639. 

  1640.     vc->previous_window = blockflag;

  1641.     return retlen;

  1642. }

  1643. 

  1644. // Return the decoded audio packet through the standard api

  1645. 

  1646. static int vorbis_decode_frame(AVCodecContext *avccontext, void *data,

  1647.                                int *got_frame_ptr, AVPacket *avpkt)

  1648. {

  1649.     const uint8_t *buf = avpkt->data;

  1650.     int buf_size       = avpkt->size;

  1651.     vorbis_context *vc = avccontext->priv_data;

  1652.     GetBitContext *gb = &vc->gb;

  1653.     float *channel_ptrs[255];

  1654.     int i, len, ret;

  1655. 

  1656.     av_dlog(NULL, "packet length %d \n", buf_size);

  1657. 

  1658.     /* get output buffer */

  1659.     vc->frame.nb_samples = vc->blocksize[1] / 2;

  1660.     if ((ret = ff_get_buffer(avccontext, &vc->frame)) < 0) {

  1661.         av_log(avccontext, AV_LOG_ERROR, "get_buffer() failed\n");

  1662.         return ret;

  1663.     }

  1664. 

  1665.     if (vc->audio_channels > 8) {

  1666.         for (i = 0; i < vc->audio_channels; i++)

  1667.             channel_ptrs[i] = (float *)vc->frame.extended_data[i];

  1668.     } else {

  1669.         for (i = 0; i < vc->audio_channels; i++) {

  1670.             int ch = ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1671.             channel_ptrs[ch] = (float *)vc->frame.extended_data[i];

  1672.         }

  1673.     }

  1674. 

  1675.     init_get_bits(gb, buf, buf_size*8);

  1676. 

  1677.     if ((len = vorbis_parse_audio_packet(vc, channel_ptrs)) <= 0)

  1678.         return len;

  1679. 

  1680.     if (!vc->first_frame) {

  1681.         vc->first_frame = 1;

  1682.         *got_frame_ptr = 0;

  1683.         return buf_size;

  1684.     }

  1685. 

  1686.     av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",

  1687.             get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);

  1688. 

  1689.     vc->frame.nb_samples = len;

  1690.     *got_frame_ptr   = 1;

  1691.     *(AVFrame *)data = vc->frame;

  1692. 

  1693.     return buf_size;

  1694. }

  1695. 

  1696. // Close decoder

  1697. 

  1698. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1699. {

  1700.     vorbis_context *vc = avccontext->priv_data;

  1701. 

  1702.     vorbis_free(vc);

  1703. 

  1704.     return 0;

  1705. }

  1706. 

  1707. static av_cold void vorbis_decode_flush(AVCodecContext *avccontext)

  1708. {

  1709.     vorbis_context *vc = avccontext->priv_data;

  1710. 

  1711.     if (vc->saved) {

  1712.         memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *

  1713.                              sizeof(*vc->saved));

  1714.     }

  1715.     vc->previous_window = 0;

  1716. }

  1717. 

  1718. AVCodec ff_vorbis_decoder = {

  1719.     .name            = "vorbis",

  1720.     .type            = AVMEDIA_TYPE_AUDIO,

  1721.     .id              = AV_CODEC_ID_VORBIS,

  1722.     .priv_data_size  = sizeof(vorbis_context),

  1723.     .init            = vorbis_decode_init,

  1724.     .close           = vorbis_decode_close,

  1725.     .decode          = vorbis_decode_frame,

  1726.     .flush           = vorbis_decode_flush,

  1727.     .capabilities    = CODEC_CAP_DR1,

  1728.     .long_name       = NULL_IF_CONFIG_SMALL("Vorbis"),

  1729.     .channel_layouts = ff_vorbis_channel_layouts,

  1730.     .sample_fmts     = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  1731.                                                        AV_SAMPLE_FMT_NONE },

  1732. };