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.
29835 Commits
32 Branches
283MB
Tree: 09a49e8919
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '09a49e8919'
${ noResults }
FFmpeg/libavcodec/vorbisdec.c

1682 lines
62KB
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 ALT_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.     GetBitContext gb;

  125.     DSPContext dsp;

  126.     FmtConvertContext fmt_conv;

  127. 

  128.     FFTContext mdct[2];

  129.     uint8_t       first_frame;

  130.     uint32_t      version;

  131.     uint8_t       audio_channels;

  132.     uint32_t      audio_samplerate;

  133.     uint32_t      bitrate_maximum;

  134.     uint32_t      bitrate_nominal;

  135.     uint32_t      bitrate_minimum;

  136.     uint32_t      blocksize[2];

  137.     const float  *win[2];

  138.     uint16_t      codebook_count;

  139.     vorbis_codebook *codebooks;

  140.     uint8_t       floor_count;

  141.     vorbis_floor *floors;

  142.     uint8_t       residue_count;

  143.     vorbis_residue *residues;

  144.     uint8_t       mapping_count;

  145.     vorbis_mapping *mappings;

  146.     uint8_t       mode_count;

  147.     vorbis_mode  *modes;

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

  149.     uint8_t       previous_window;

  150.     float        *channel_residues;

  151.     float        *channel_floors;

  152.     float        *saved;

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

  154. } vorbis_context;

  155. 

  156. /* Helper functions */

  157. 

  158. #define BARK(x) \

  159.     (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))

  160. 

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

  162. #define VALIDATE_INDEX(idx, limit) \

  163.     if (idx >= limit) {\

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

  165.                idx_err_str,\

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

  167.         return -1;\

  168.     }

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

  170.     {\

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

  172.         VALIDATE_INDEX(idx, limit)\

  173.     }

  174. 

  175. static float vorbisfloat2float(unsigned val)

  176. {

  177.     double mant = val & 0x1fffff;

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

  179.     if (val & 0x80000000)

  180.         mant = -mant;

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

  182. }

  183. 

  184. 

  185. // Free all allocated memory -----------------------------------------

  186. 

  187. static void vorbis_free(vorbis_context *vc)

  188. {

  189.     int i;

  190. 

  191.     av_freep(&vc->channel_residues);

  192.     av_freep(&vc->channel_floors);

  193.     av_freep(&vc->saved);

  194. 

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

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

  197.     av_freep(&vc->residues);

  198.     av_freep(&vc->modes);

  199. 

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

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

  202. 

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

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

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

  206.     }

  207.     av_freep(&vc->codebooks);

  208. 

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

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

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

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

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

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

  215.         } else {

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

  217.         }

  218.     }

  219.     av_freep(&vc->floors);

  220. 

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

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

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

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

  225.     }

  226.     av_freep(&vc->mappings);

  227. }

  228. 

  229. // Parse setup header -------------------------------------------------

  230. 

  231. // Process codebooks part

  232. 

  233. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  234. {

  235.     unsigned cb;

  236.     uint8_t  *tmp_vlc_bits;

  237.     uint32_t *tmp_vlc_codes;

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

  239.     uint16_t *codebook_multiplicands;

  240. 

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

  242. 

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

  244. 

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

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

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

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

  249. 

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

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

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

  253. 

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

  255. 

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

  257.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  259.             goto error;

  260.         }

  261. 

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

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

  264.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  266.                    cb, codebook_setup->dimensions);

  267.             goto error;

  268.         }

  269.         entries = get_bits(gb, 24);

  270.         if (entries > V_MAX_VLCS) {

  271.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  273.                    cb, entries);

  274.             goto error;

  275.         }

  276. 

  277.         ordered = get_bits1(gb);

  278. 

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

  280.                 codebook_setup->dimensions, entries);

  281. 

  282.         if (!ordered) {

  283.             unsigned ce, flag;

  284.             unsigned sparse = get_bits1(gb);

  285. 

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

  287. 

  288.             if (sparse) {

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

  290. 

  291.                 used_entries = 0;

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

  293.                     flag = get_bits1(gb);

  294.                     if (flag) {

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

  296.                         ++used_entries;

  297.                     } else

  298.                         tmp_vlc_bits[ce] = 0;

  299.                 }

  300.             } else {

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

  302. 

  303.                 used_entries = entries;

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

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

  306.             }

  307.         } else {

  308.             unsigned current_entry  = 0;

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

  310. 

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

  312. 

  313.             used_entries = entries;

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

  315.                 unsigned i, number;

  316. 

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

  318. 

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

  320. 

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

  322. 

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

  324.                     if (i < used_entries)

  325.                         tmp_vlc_bits[i] = current_length;

  326. 

  327.                 current_entry+=number;

  328.             }

  329.             if (current_entry>used_entries) {

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

  331.                 goto error;

  332.             }

  333.         }

  334. 

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

  336. 

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

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

  339. 

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

  341. 

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

  343.             unsigned i, j, k;

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

  345. 

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

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

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

  349.             unsigned codebook_sequence_p = get_bits1(gb);

  350. 

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

  352.                     codebook_lookup_values);

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

  354.                     codebook_delta_value, codebook_minimum_value);

  355. 

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

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

  358. 

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

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

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

  362.             }

  363. 

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

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

  366.                                                                     codebook_setup->dimensions *

  367.                                                                     sizeof(*codebook_setup->codevectors))

  368.                                                        : NULL;

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

  370.                 unsigned dim = codebook_setup->dimensions;

  371. 

  372.                 if (tmp_vlc_bits[i]) {

  373.                     float last = 0.0;

  374.                     unsigned lookup_offset = i;

  375. 

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

  377. 

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

  379.                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  381.                         if (codebook_sequence_p)

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

  383.                         lookup_offset/=codebook_lookup_values;

  384.                     }

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

  386. 

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

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

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

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

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

  392. 

  393.                     ++j;

  394.                 }

  395.             }

  396.             if (j != used_entries) {

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

  398.                 goto error;

  399.             }

  400.             entries = used_entries;

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

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

  403.             goto error;

  404.         }

  405. 

  406. // Initialize VLC table

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

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

  409.             goto error;

  410.         }

  411.         codebook_setup->maxdepth = 0;

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

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

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

  415. 

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

  417.             codebook_setup->nb_bits = V_NB_BITS2;

  418.         else

  419.             codebook_setup->nb_bits = V_NB_BITS;

  420. 

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

  422. 

  423.         if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {

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

  425.             goto error;

  426.         }

  427.     }

  428. 

  429.     av_free(tmp_vlc_bits);

  430.     av_free(tmp_vlc_codes);

  431.     av_free(codebook_multiplicands);

  432.     return 0;

  433. 

  434. // Error:

  435. error:

  436.     av_free(tmp_vlc_bits);

  437.     av_free(tmp_vlc_codes);

  438.     av_free(codebook_multiplicands);

  439.     return -1;

  440. }

  441. 

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

  443. 

  444. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  445. {

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

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

  448. 

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

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

  451. 

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

  453.                 vorbis_time_count, vorbis_tdtransform);

  454. 

  455.         if (vorbis_tdtransform) {

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

  457.             return -1;

  458.         }

  459.     }

  460.     return 0;

  461. }

  462. 

  463. // Process floors part

  464. 

  465. static int vorbis_floor0_decode(vorbis_context *vc,

  466.                                 vorbis_floor_data *vfu, float *vec);

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

  468. static int vorbis_floor1_decode(vorbis_context *vc,

  469.                                 vorbis_floor_data *vfu, float *vec);

  470. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  471. {

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

  473.     int i,j,k;

  474. 

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

  476. 

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

  478. 

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

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

  481. 

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

  483. 

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

  485. 

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

  487.             int maximum_class = -1;

  488.             unsigned rangebits, rangemax, floor1_values = 2;

  489. 

  490.             floor_setup->decode = vorbis_floor1_decode;

  491. 

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

  493. 

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

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

  496. 

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

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

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

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

  501. 

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

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

  504. 

  505.             }

  506. 

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

  508. 

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

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

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

  512. 

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

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

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

  516. 

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

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

  519. 

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

  521.                 }

  522. 

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

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

  525.                     if (bits != -1)

  526.                         VALIDATE_INDEX(bits, vc->codebook_count)

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

  528. 

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

  530.                 }

  531.             }

  532. 

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

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

  535. 

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

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

  538. 

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

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

  541. 

  542. 

  543.             rangebits = get_bits(gb, 4);

  544.             rangemax = (1 << rangebits);

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

  546.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

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

  549.                 return -1;

  550.             }

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

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

  553. 

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

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

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

  557. 

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

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

  560.                 }

  561.             }

  562. 

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

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

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

  566.             unsigned max_codebook_dim = 0;

  567. 

  568.             floor_setup->decode = vorbis_floor0_decode;

  569. 

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

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

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

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

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

  575.              * 2^0 - 1 == 0                             */

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

  577.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

  579.                 return -1;

  580.             }

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

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

  583. 

  584.             /* allocate mem for booklist */

  585.             floor_setup->data.t0.book_list =

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

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

  588.                 return -1;

  589.             /* read book indexes */

  590.             {

  591.                 int idx;

  592.                 unsigned book_idx;

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

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

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

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

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

  598.                 }

  599.             }

  600. 

  601.             create_map(vc, i);

  602. 

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

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

  605.             floor_setup->data.t0.lsp =

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

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

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

  609.                 return -1;

  610. 

  611.             /* debug output parsed headers */

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

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

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

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

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

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

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

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

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

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

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

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

  624.             {

  625.                 int idx;

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

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

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

  629.                 }

  630.             }

  631.         } else {

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

  633.             return -1;

  634.         }

  635.     }

  636.     return 0;

  637. }

  638. 

  639. // Process residues part

  640. 

  641. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  642. {

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

  644.     unsigned i, j, k;

  645. 

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

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

  648. 

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

  650. 

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

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

  653.         uint8_t cascade[64];

  654.         unsigned high_bits, low_bits;

  655. 

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

  657. 

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

  659. 

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

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

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

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

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

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

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

  667.             av_log(vc->avccontext, AV_LOG_ERROR,

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

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

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

  671.             return -1;

  672.         }

  673. 

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

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

  676. 

  677.         res_setup->ptns_to_read =

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

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

  680.                                         vc->audio_channels *

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

  682.         if (!res_setup->classifs)

  683.             return AVERROR(ENOMEM);

  684. 

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

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

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

  688. 

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

  690.             high_bits = 0;

  691.             low_bits  = get_bits(gb, 3);

  692.             if (get_bits1(gb))

  693.                 high_bits = get_bits(gb, 5);

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

  695. 

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

  697.         }

  698. 

  699.         res_setup->maxpass = 0;

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

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

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

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

  704. 

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

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

  707. 

  708.                     if (k>res_setup->maxpass)

  709.                         res_setup->maxpass = k;

  710.                 } else {

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

  712.                 }

  713.             }

  714.         }

  715.     }

  716.     return 0;

  717. }

  718. 

  719. // Process mappings part

  720. 

  721. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  722. {

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

  724.     unsigned i, j;

  725. 

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

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

  728. 

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

  730. 

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

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

  733. 

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

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

  736.             return -1;

  737.         }

  738.         if (get_bits1(gb)) {

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

  740.         } else {

  741.             mapping_setup->submaps = 1;

  742.         }

  743. 

  744.         if (get_bits1(gb)) {

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

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

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

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

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

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

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

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

  753.             }

  754.         } else {

  755.             mapping_setup->coupling_steps = 0;

  756.         }

  757. 

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

  759.                 i, mapping_setup->coupling_steps);

  760. 

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

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

  763.             return -1; // following spec.

  764.         }

  765. 

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

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

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

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

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

  771.         }

  772. 

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

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

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

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

  777. 

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

  779.                     mapping_setup->submap_floor[j],

  780.                     mapping_setup->submap_residue[j]);

  781.         }

  782.     }

  783.     return 0;

  784. }

  785. 

  786. // Process modes part

  787. 

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

  789. {

  790.     vorbis_floor *floors = vc->floors;

  791.     vorbis_floor0 *vf;

  792.     int idx;

  793.     int blockflag, n;

  794.     int32_t *map;

  795. 

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

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

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

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

  800. 

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

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

  803. 

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

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

  806.                              ((vf->bark_map_size) /

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

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

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

  810.         }

  811.         map[n] = -1;

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

  813.     }

  814. 

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

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

  817.     }

  818. }

  819. 

  820. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  821. {

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

  823.     unsigned i;

  824. 

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

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

  827. 

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

  829. 

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

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

  832. 

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

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

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

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

  837. 

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

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

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

  841.     }

  842.     return 0;

  843. }

  844. 

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

  846. 

  847. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  848. {

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

  850. 

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

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

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

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

  855.         return -1;

  856.     }

  857. 

  858.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  860.         return -2;

  861.     }

  862.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  864.         return -3;

  865.     }

  866.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  868.         return -4;

  869.     }

  870.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  872.         return -5;

  873.     }

  874.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  876.         return -6;

  877.     }

  878.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  880.         return -7;

  881.     }

  882.     if (!get_bits1(gb)) {

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

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

  885.     }

  886. 

  887.     return 0;

  888. }

  889. 

  890. // Process the identification header

  891. 

  892. static int vorbis_parse_id_hdr(vorbis_context *vc)

  893. {

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

  895.     unsigned bl0, bl1;

  896. 

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

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

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

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

  901.         return -1;

  902.     }

  903. 

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

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

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

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

  908.         return -1;

  909.     }

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

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

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

  913.         return -1;

  914.     }

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

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

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

  918.     bl0 = get_bits(gb, 4);

  919.     bl1 = get_bits(gb, 4);

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

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

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

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

  924.         return -3;

  925.     }

  926.     // output format int16

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

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

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

  930.         return -4;

  931.     }

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

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

  934. 

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

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

  937.         return -2;

  938.     }

  939. 

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

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

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

  943.     vc->previous_window  = 0;

  944. 

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

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

  947. 

  948.     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 ",

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

  950. 

  951. /*

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

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

  954.         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)));

  955.     }

  956. */

  957. 

  958.     return 0;

  959. }

  960. 

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

  962. 

  963. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  964. {

  965.     vorbis_context *vc = avccontext->priv_data ;

  966.     uint8_t *headers   = avccontext->extradata;

  967.     int headers_len    = avccontext->extradata_size;

  968.     uint8_t *header_start[3];

  969.     int header_len[3];

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

  971.     int hdr_type;

  972. 

  973.     vc->avccontext = avccontext;

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

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

  976. 

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

  978.         avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;

  979.         vc->scale_bias = 1.0f;

  980.     } else {

  981.         avccontext->sample_fmt = AV_SAMPLE_FMT_S16;

  982.         vc->scale_bias = 32768.0f;

  983.     }

  984. 

  985.     if (!headers_len) {

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

  987.         return -1;

  988.     }

  989. 

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

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

  992.         return -1;

  993.     }

  994. 

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

  996.     hdr_type = get_bits(gb, 8);

  997.     if (hdr_type != 1) {

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

  999.         return -1;

  1000.     }

  1001.     if (vorbis_parse_id_hdr(vc)) {

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

  1003.         vorbis_free(vc);

  1004.         return -1;

  1005.     }

  1006. 

  1007.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1008.     hdr_type = get_bits(gb, 8);

  1009.     if (hdr_type != 5) {

  1010.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1011.         vorbis_free(vc);

  1012.         return -1;

  1013.     }

  1014.     if (vorbis_parse_setup_hdr(vc)) {

  1015.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1016.         vorbis_free(vc);

  1017.         return -1;

  1018.     }

  1019. 

  1020.     if (vc->audio_channels > 8)

  1021.         avccontext->channel_layout = 0;

  1022.     else

  1023.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1024. 

  1025.     avccontext->channels    = vc->audio_channels;

  1026.     avccontext->sample_rate = vc->audio_samplerate;

  1027.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;

  1028. 

  1029.     return 0 ;

  1030. }

  1031. 

  1032. // Decode audiopackets -------------------------------------------------

  1033. 

  1034. // Read and decode floor

  1035. 

  1036. static int vorbis_floor0_decode(vorbis_context *vc,

  1037.                                 vorbis_floor_data *vfu, float *vec)

  1038. {

  1039.     vorbis_floor0 *vf = &vfu->t0;

  1040.     float *lsp = vf->lsp;

  1041.     unsigned amplitude, book_idx;

  1042.     unsigned blockflag = vc->modes[vc->mode_number].blockflag;

  1043. 

  1044.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1045.     if (amplitude > 0) {

  1046.         float last = 0;

  1047.         unsigned idx, lsp_len = 0;

  1048.         vorbis_codebook codebook;

  1049. 

  1050.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1051.         if (book_idx >= vf->num_books) {

  1052.             av_log(vc->avccontext, AV_LOG_ERROR,

  1053.                     "floor0 dec: booknumber too high!\n");

  1054.             book_idx =  0;

  1055.         }

  1056.         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);

  1057.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1058.         /* Invalid codebook! */

  1059.         if (!codebook.codevectors)

  1060.             return -1;

  1061. 

  1062.         while (lsp_len<vf->order) {

  1063.             int vec_off;

  1064. 

  1065.             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);

  1066.             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1067.             /* read temp vector */

  1068.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1069.                                codebook.nb_bits, codebook.maxdepth)

  1070.                       * codebook.dimensions;

  1071.             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);

  1072.             /* copy each vector component and add last to it */

  1073.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1074.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1075.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1076. 

  1077.             lsp_len += codebook.dimensions;

  1078.         }

  1079.         /* DEBUG: output lsp coeffs */

  1080.         {

  1081.             int idx;

  1082.             for (idx = 0; idx < lsp_len; ++idx)

  1083.                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1084.         }

  1085. 

  1086.         /* synthesize floor output vector */

  1087.         {

  1088.             int i;

  1089.             int order = vf->order;

  1090.             float wstep = M_PI / vf->bark_map_size;

  1091. 

  1092.             for (i = 0; i < order; i++)

  1093.                 lsp[i] = 2.0f * cos(lsp[i]);

  1094. 

  1095.             av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",

  1096.                     vf->map_size[blockflag], order, wstep);

  1097. 

  1098.             i = 0;

  1099.             while (i < vf->map_size[blockflag]) {

  1100.                 int j, iter_cond = vf->map[blockflag][i];

  1101.                 float p = 0.5f;

  1102.                 float q = 0.5f;

  1103.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1104. 

  1105.                 /* similar part for the q and p products */

  1106.                 for (j = 0; j + 1 < order; j += 2) {

  1107.                     q *= lsp[j]     - two_cos_w;

  1108.                     p *= lsp[j + 1] - two_cos_w;

  1109.                 }

  1110.                 if (j == order) { // even order

  1111.                     p *= p * (2.0f - two_cos_w);

  1112.                     q *= q * (2.0f + two_cos_w);

  1113.                 } else { // odd order

  1114.                     q *= two_cos_w-lsp[j]; // one more time for q

  1115. 

  1116.                     /* final step and square */

  1117.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1118.                     q *= q;

  1119.                 }

  1120. 

  1121.                 /* calculate linear floor value */

  1122.                 q = exp((((amplitude*vf->amplitude_offset) /

  1123.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1124.                          - vf->amplitude_offset) * .11512925f);

  1125. 

  1126.                 /* fill vector */

  1127.                 do {

  1128.                     vec[i] = q; ++i;

  1129.                 } while (vf->map[blockflag][i] == iter_cond);

  1130.             }

  1131.         }

  1132.     } else {

  1133.         /* this channel is unused */

  1134.         return 1;

  1135.     }

  1136. 

  1137.     av_dlog(NULL, " Floor0 decoded\n");

  1138. 

  1139.     return 0;

  1140. }

  1141. 

  1142. static int vorbis_floor1_decode(vorbis_context *vc,

  1143.                                 vorbis_floor_data *vfu, float *vec)

  1144. {

  1145.     vorbis_floor1 *vf = &vfu->t1;

  1146.     GetBitContext *gb = &vc->gb;

  1147.     uint16_t range_v[4] = { 256, 128, 86, 64 };

  1148.     unsigned range = range_v[vf->multiplier - 1];

  1149.     uint16_t floor1_Y[258];

  1150.     uint16_t floor1_Y_final[258];

  1151.     int floor1_flag[258];

  1152.     unsigned class, cdim, cbits, csub, cval, offset, i, j;

  1153.     int book, adx, ady, dy, off, predicted, err;

  1154. 

  1155. 

  1156.     if (!get_bits1(gb)) // silence

  1157.         return 1;

  1158. 

  1159. // Read values (or differences) for the floor's points

  1160. 

  1161.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1162.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1163. 

  1164.     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1165. 

  1166.     offset = 2;

  1167.     for (i = 0; i < vf->partitions; ++i) {

  1168.         class = vf->partition_class[i];

  1169.         cdim   = vf->class_dimensions[class];

  1170.         cbits  = vf->class_subclasses[class];

  1171.         csub = (1 << cbits) - 1;

  1172.         cval = 0;

  1173. 

  1174.         av_dlog(NULL, "Cbits %u\n", cbits);

  1175. 

  1176.         if (cbits) // this reads all subclasses for this partition's class

  1177.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,

  1178.                             vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);

  1179. 

  1180.         for (j = 0; j < cdim; ++j) {

  1181.             book = vf->subclass_books[class][cval & csub];

  1182. 

  1183.             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",

  1184.                     book, cbits, cval, get_bits_count(gb));

  1185. 

  1186.             cval = cval >> cbits;

  1187.             if (book > -1) {

  1188.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1189.                 vc->codebooks[book].nb_bits, 3);

  1190.             } else {

  1191.                 floor1_Y[offset+j] = 0;

  1192.             }

  1193. 

  1194.             av_dlog(NULL, " floor(%d) = %d \n",

  1195.                     vf->list[offset+j].x, floor1_Y[offset+j]);

  1196.         }

  1197.         offset+=cdim;

  1198.     }

  1199. 

  1200. // Amplitude calculation from the differences

  1201. 

  1202.     floor1_flag[0] = 1;

  1203.     floor1_flag[1] = 1;

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

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

  1206. 

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

  1208.         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;

  1209. 

  1210.         low_neigh_offs  = vf->list[i].low;

  1211.         high_neigh_offs = vf->list[i].high;

  1212.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1213.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1214.         ady = FFABS(dy);

  1215.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1216.         off = err / adx;

  1217.         if (dy < 0) {

  1218.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1219.         } else {

  1220.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1221.         } // render_point end

  1222. 

  1223.         val = floor1_Y[i];

  1224.         highroom = range-predicted;

  1225.         lowroom  = predicted;

  1226.         if (highroom < lowroom) {

  1227.             room = highroom * 2;

  1228.         } else {

  1229.             room = lowroom * 2;   // SPEC mispelling

  1230.         }

  1231.         if (val) {

  1232.             floor1_flag[low_neigh_offs]  = 1;

  1233.             floor1_flag[high_neigh_offs] = 1;

  1234.             floor1_flag[i]               = 1;

  1235.             if (val >= room) {

  1236.                 if (highroom > lowroom) {

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

  1238.                 } else {

  1239.                     floor1_Y_final[i] = predicted - val + highroom - 1;

  1240.                 }

  1241.             } else {

  1242.                 if (val & 1) {

  1243.                     floor1_Y_final[i] = predicted - (val + 1) / 2;

  1244.                 } else {

  1245.                     floor1_Y_final[i] = predicted + val / 2;

  1246.                 }

  1247.             }

  1248.         } else {

  1249.             floor1_flag[i]    = 0;

  1250.             floor1_Y_final[i] = predicted;

  1251.         }

  1252. 

  1253.         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",

  1254.                 vf->list[i].x, floor1_Y_final[i], val);

  1255.     }

  1256. 

  1257. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1258. 

  1259.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1260. 

  1261.     av_dlog(NULL, " Floor decoded\n");

  1262. 

  1263.     return 0;

  1264. }

  1265. 

  1266. // Read and decode residue

  1267. 

  1268. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1269.                                                            vorbis_residue *vr,

  1270.                                                            unsigned ch,

  1271.                                                            uint8_t *do_not_decode,

  1272.                                                            float *vec,

  1273.                                                            unsigned vlen,

  1274.                                                            int vr_type)

  1275. {

  1276.     GetBitContext *gb = &vc->gb;

  1277.     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;

  1278.     unsigned ptns_to_read = vr->ptns_to_read;

  1279.     uint8_t *classifs = vr->classifs;

  1280.     unsigned pass, ch_used, i, j, k, l;

  1281. 

  1282.     if (vr_type == 2) {

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

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

  1285.         if (do_not_decode[0])

  1286.             return 0;

  1287.         ch_used = 1;

  1288.     } else {

  1289.         ch_used = ch;

  1290.     }

  1291. 

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

  1293. 

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

  1295.         uint16_t voffset, partition_count, j_times_ptns_to_read;

  1296. 

  1297.         voffset = vr->begin;

  1298.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1299.             if (!pass) {

  1300.                 unsigned inverse_class = ff_inverse[vr->classifications];

  1301.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1302.                     if (!do_not_decode[j]) {

  1303.                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1304.                                                  vc->codebooks[vr->classbook].nb_bits, 3);

  1305. 

  1306.                         av_dlog(NULL, "Classword: %u\n", temp);

  1307. 

  1308.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1309.                         for (i = 0; i < c_p_c; ++i) {

  1310.                             unsigned temp2;

  1311. 

  1312.                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;

  1313.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1314.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1315.                             temp = temp2;

  1316.                         }

  1317.                     }

  1318.                     j_times_ptns_to_read += ptns_to_read;

  1319.                 }

  1320.             }

  1321.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1322.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1323.                     unsigned voffs;

  1324. 

  1325.                     if (!do_not_decode[j]) {

  1326.                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];

  1327.                         int vqbook  = vr->books[vqclass][pass];

  1328. 

  1329.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1330.                             unsigned coffs;

  1331.                             unsigned dim  = vc->codebooks[vqbook].dimensions;

  1332.                             unsigned step = dim == 1 ? vr->partition_size

  1333.                                                      : FASTDIV(vr->partition_size, dim);

  1334.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1335. 

  1336.                             if (vr_type == 0) {

  1337. 

  1338.                                 voffs = voffset+j*vlen;

  1339.                                 for (k = 0; k < step; ++k) {

  1340.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1341.                                     for (l = 0; l < dim; ++l)

  1342.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH

  1343.                                 }

  1344.                             } else if (vr_type == 1) {

  1345.                                 voffs = voffset + j * vlen;

  1346.                                 for (k = 0; k < step; ++k) {

  1347.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1348.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1349.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1350. 

  1351.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d  \n",

  1352.                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1353.                                     }

  1354.                                 }

  1355.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1356.                                 voffs = voffset >> 1;

  1357. 

  1358.                                 if (dim == 2) {

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

  1360.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

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

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

  1363.                                     }

  1364.                                 } else if (dim == 4) {

  1365.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1366.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

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

  1368.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH

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

  1370.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH

  1371.                                     }

  1372.                                 } else

  1373.                                 for (k = 0; k < step; ++k) {

  1374.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1375.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1376.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH

  1377.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH

  1378. 

  1379.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1380.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1381.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1382.                                                 codebook.codevectors[coffs + l], coffs, l);

  1383.                                     }

  1384.                                 }

  1385. 

  1386.                             } else if (vr_type == 2) {

  1387.                                 voffs = voffset;

  1388. 

  1389.                                 for (k = 0; k < step; ++k) {

  1390.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1391.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1392.                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %

  1393. 

  1394.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1395.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1396.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1397.                                                 codebook.codevectors[coffs + l], coffs, l);

  1398.                                     }

  1399.                                 }

  1400.                             }

  1401.                         }

  1402.                     }

  1403.                     j_times_ptns_to_read += ptns_to_read;

  1404.                 }

  1405.                 ++partition_count;

  1406.                 voffset += vr->partition_size;

  1407.             }

  1408.         }

  1409.     }

  1410.     return 0;

  1411. }

  1412. 

  1413. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1414.                                         unsigned ch,

  1415.                                         uint8_t *do_not_decode,

  1416.                                         float *vec, unsigned vlen)

  1417. {

  1418.     if (vr->type == 2)

  1419.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1420.     else if (vr->type == 1)

  1421.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1422.     else if (vr->type == 0)

  1423.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1424.     else {

  1425.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1426.         return -1;

  1427.     }

  1428. }

  1429. 

  1430. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1431. {

  1432.     int i;

  1433.     for (i = 0;  i < blocksize;  i++) {

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

  1435.             if (ang[i] > 0.0) {

  1436.                 ang[i] = mag[i] - ang[i];

  1437.             } else {

  1438.                 float temp = ang[i];

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

  1440.                 mag[i]    += temp;

  1441.             }

  1442.         } else {

  1443.             if (ang[i] > 0.0) {

  1444.                 ang[i] += mag[i];

  1445.             } else {

  1446.                 float temp = ang[i];

  1447.                 ang[i]     = mag[i];

  1448.                 mag[i]    -= temp;

  1449.             }

  1450.         }

  1451.     }

  1452. }

  1453. 

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

  1455. 

  1456. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1457. {

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

  1459.     FFTContext *mdct;

  1460.     unsigned previous_window = vc->previous_window;

  1461.     unsigned mode_number, blockflag, blocksize;

  1462.     int i, j;

  1463.     uint8_t no_residue[255];

  1464.     uint8_t do_not_decode[255];

  1465.     vorbis_mapping *mapping;

  1466.     float *ch_res_ptr   = vc->channel_residues;

  1467.     float *ch_floor_ptr = vc->channel_floors;

  1468.     uint8_t res_chan[255];

  1469.     unsigned res_num = 0;

  1470.     int retlen  = 0;

  1471. 

  1472.     if (get_bits1(gb)) {

  1473.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1474.         return -1; // packet type not audio

  1475.     }

  1476. 

  1477.     if (vc->mode_count == 1) {

  1478.         mode_number = 0;

  1479.     } else {

  1480.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1481.     }

  1482.     vc->mode_number = mode_number;

  1483.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1484. 

  1485.     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,

  1486.             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1487. 

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

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

  1490.     if (blockflag)

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

  1492. 

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

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

  1495. 

  1496. // Decode floor

  1497. 

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

  1499.         vorbis_floor *floor;

  1500.         int ret;

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

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

  1503.         } else {

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

  1505.         }

  1506. 

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

  1508. 

  1509.         if (ret < 0) {

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

  1511.             return -1;

  1512.         }

  1513.         no_residue[i] = ret;

  1514.         ch_floor_ptr += blocksize / 2;

  1515.     }

  1516. 

  1517. // Nonzero vector propagate

  1518. 

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

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

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

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

  1523.         }

  1524.     }

  1525. 

  1526. // Decode residue

  1527. 

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

  1529.         vorbis_residue *residue;

  1530.         unsigned ch = 0;

  1531. 

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

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

  1534.                 res_chan[j] = res_num;

  1535.                 if (no_residue[j]) {

  1536.                     do_not_decode[ch] = 1;

  1537.                 } else {

  1538.                     do_not_decode[ch] = 0;

  1539.                 }

  1540.                 ++ch;

  1541.                 ++res_num;

  1542.             }

  1543.         }

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

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

  1546. 

  1547.         ch_res_ptr += ch * blocksize / 2;

  1548.     }

  1549. 

  1550. // Inverse coupling

  1551. 

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

  1553.         float *mag, *ang;

  1554. 

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

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

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

  1558.     }

  1559. 

  1560. // Dotproduct, MDCT

  1561. 

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

  1563. 

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

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

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

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

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

  1569.     }

  1570. 

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

  1572. 

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

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

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

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

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

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

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

  1580.         float *buf        = residue;

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

  1582. 

  1583.         if (blockflag == previous_window) {

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

  1585.         } else if (blockflag > previous_window) {

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

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

  1588.         } else {

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

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

  1591.         }

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

  1593.     }

  1594. 

  1595.     vc->previous_window = blockflag;

  1596.     return retlen;

  1597. }

  1598. 

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

  1600. 

  1601. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1602.                                void *data, int *data_size,

  1603.                                AVPacket *avpkt)

  1604. {

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

  1606.     int buf_size       = avpkt->size;

  1607.     vorbis_context *vc = avccontext->priv_data ;

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

  1609.     const float *channel_ptrs[255];

  1610.     int i, len;

  1611. 

  1612.     if (!buf_size)

  1613.         return 0;

  1614. 

  1615.     av_dlog(NULL, "packet length %d \n", buf_size);

  1616. 

  1617.     init_get_bits(gb, buf, buf_size*8);

  1618. 

  1619.     len = vorbis_parse_audio_packet(vc);

  1620. 

  1621.     if (len <= 0) {

  1622.         *data_size = 0;

  1623.         return buf_size;

  1624.     }

  1625. 

  1626.     if (!vc->first_frame) {

  1627.         vc->first_frame = 1;

  1628.         *data_size = 0;

  1629.         return buf_size ;

  1630.     }

  1631. 

  1632.     av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",

  1633.             get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);

  1634. 

  1635.     if (vc->audio_channels > 8) {

  1636.         for (i = 0; i < vc->audio_channels; i++)

  1637.             channel_ptrs[i] = vc->channel_floors + i * len;

  1638.     } else {

  1639.         for (i = 0; i < vc->audio_channels; i++)

  1640.             channel_ptrs[i] = vc->channel_floors +

  1641.                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1642.     }

  1643. 

  1644.     if (avccontext->sample_fmt == AV_SAMPLE_FMT_FLT)

  1645.         vc->fmt_conv.float_interleave(data, channel_ptrs, len, vc->audio_channels);

  1646.     else

  1647.         vc->fmt_conv.float_to_int16_interleave(data, channel_ptrs, len,

  1648.                                                vc->audio_channels);

  1649. 

  1650.     *data_size = len * vc->audio_channels *

  1651.                  av_get_bytes_per_sample(avccontext->sample_fmt);

  1652. 

  1653.     return buf_size ;

  1654. }

  1655. 

  1656. // Close decoder

  1657. 

  1658. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1659. {

  1660.     vorbis_context *vc = avccontext->priv_data;

  1661. 

  1662.     vorbis_free(vc);

  1663. 

  1664.     return 0 ;

  1665. }

  1666. 

  1667. AVCodec ff_vorbis_decoder = {

  1668.     .name           = "vorbis",

  1669.     .type           = AVMEDIA_TYPE_AUDIO,

  1670.     .id             = CODEC_ID_VORBIS,

  1671.     .priv_data_size = sizeof(vorbis_context),

  1672.     .init           = vorbis_decode_init,

  1673.     .close          = vorbis_decode_close,

  1674.     .decode         = vorbis_decode_frame,

  1675.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1676.     .channel_layouts = ff_vorbis_channel_layouts,

  1677.     .sample_fmts = (const enum AVSampleFormat[]) {

  1678.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE

  1679.     },

  1680. };