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FFmpeg/libavcodec/vorbisdec.c

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  1. /**

  2.  * @file

  3.  * Vorbis I decoder

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

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

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

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

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

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

  19.  * License along with FFmpeg; if not, write to the Free Software

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

  21.  */

  22. 

  23. #undef V_DEBUG

  24. //#define V_DEBUG

  25. //#define AV_DEBUG(...) av_log(NULL, AV_LOG_INFO, __VA_ARGS__)

  26. 

  27. #include <math.h>

  28. 

  29. #define ALT_BITSTREAM_READER_LE

  30. #include "avcodec.h"

  31. #include "get_bits.h"

  32. #include "dsputil.h"

  33. #include "fft.h"

  34. #include "fmtconvert.h"

  35. 

  36. #include "vorbis.h"

  37. #include "xiph.h"

  38. 

  39. #define V_NB_BITS 8

  40. #define V_NB_BITS2 11

  41. #define V_MAX_VLCS (1 << 16)

  42. #define V_MAX_PARTITIONS (1 << 20)

  43. 

  44. #ifndef V_DEBUG

  45. #define AV_DEBUG(...)

  46. #endif

  47. 

  48. #undef NDEBUG

  49. #include <assert.h>

  50. 

  51. typedef struct {

  52.     uint8_t      dimensions;

  53.     uint8_t      lookup_type;

  54.     uint8_t      maxdepth;

  55.     VLC          vlc;

  56.     float       *codevectors;

  57.     unsigned int nb_bits;

  58. } vorbis_codebook;

  59. 

  60. typedef union  vorbis_floor_u  vorbis_floor_data;

  61. typedef struct vorbis_floor0_s vorbis_floor0;

  62. typedef struct vorbis_floor1_s vorbis_floor1;

  63. struct vorbis_context_s;

  64. typedef

  65. int (* vorbis_floor_decode_func)

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

  67. typedef struct {

  68.     uint8_t floor_type;

  69.     vorbis_floor_decode_func decode;

  70.     union vorbis_floor_u {

  71.         struct vorbis_floor0_s {

  72.             uint8_t       order;

  73.             uint16_t      rate;

  74.             uint16_t      bark_map_size;

  75.             int32_t      *map[2];

  76.             uint32_t      map_size[2];

  77.             uint8_t       amplitude_bits;

  78.             uint8_t       amplitude_offset;

  79.             uint8_t       num_books;

  80.             uint8_t      *book_list;

  81.             float        *lsp;

  82.         } t0;

  83.         struct vorbis_floor1_s {

  84.             uint8_t       partitions;

  85.             uint8_t       partition_class[32];

  86.             uint8_t       class_dimensions[16];

  87.             uint8_t       class_subclasses[16];

  88.             uint8_t       class_masterbook[16];

  89.             int16_t       subclass_books[16][8];

  90.             uint8_t       multiplier;

  91.             uint16_t      x_list_dim;

  92.             vorbis_floor1_entry *list;

  93.         } t1;

  94.     } data;

  95. } vorbis_floor;

  96. 

  97. typedef struct {

  98.     uint16_t      type;

  99.     uint32_t      begin;

  100.     uint32_t      end;

  101.     unsigned      partition_size;

  102.     uint8_t       classifications;

  103.     uint8_t       classbook;

  104.     int16_t       books[64][8];

  105.     uint8_t       maxpass;

  106.     uint16_t      ptns_to_read;

  107.     uint8_t      *classifs;

  108. } vorbis_residue;

  109. 

  110. typedef struct {

  111.     uint8_t       submaps;

  112.     uint16_t      coupling_steps;

  113.     uint8_t      *magnitude;

  114.     uint8_t      *angle;

  115.     uint8_t      *mux;

  116.     uint8_t       submap_floor[16];

  117.     uint8_t       submap_residue[16];

  118. } vorbis_mapping;

  119. 

  120. typedef struct {

  121.     uint8_t       blockflag;

  122.     uint16_t      windowtype;

  123.     uint16_t      transformtype;

  124.     uint8_t       mapping;

  125. } vorbis_mode;

  126. 

  127. typedef struct vorbis_context_s {

  128.     AVCodecContext *avccontext;

  129.     GetBitContext gb;

  130.     DSPContext dsp;

  131.     FmtConvertContext fmt_conv;

  132. 

  133.     FFTContext mdct[2];

  134.     uint8_t       first_frame;

  135.     uint32_t      version;

  136.     uint8_t       audio_channels;

  137.     uint32_t      audio_samplerate;

  138.     uint32_t      bitrate_maximum;

  139.     uint32_t      bitrate_nominal;

  140.     uint32_t      bitrate_minimum;

  141.     uint32_t      blocksize[2];

  142.     const float  *win[2];

  143.     uint16_t      codebook_count;

  144.     vorbis_codebook *codebooks;

  145.     uint8_t       floor_count;

  146.     vorbis_floor *floors;

  147.     uint8_t       residue_count;

  148.     vorbis_residue *residues;

  149.     uint8_t       mapping_count;

  150.     vorbis_mapping *mappings;

  151.     uint8_t       mode_count;

  152.     vorbis_mode  *modes;

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

  154.     uint8_t       previous_window;

  155.     float        *channel_residues;

  156.     float        *channel_floors;

  157.     float        *saved;

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

  159. } vorbis_context;

  160. 

  161. /* Helper functions */

  162. 

  163. #define BARK(x) \

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

  165. 

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

  167. #define VALIDATE_INDEX(idx, limit) \

  168.     if (idx >= limit) {\

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

  170.                idx_err_str,\

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

  172.         return -1;\

  173.     }

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

  175.     {\

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

  177.         VALIDATE_INDEX(idx, limit)\

  178.     }

  179. 

  180. static float vorbisfloat2float(unsigned val)

  181. {

  182.     double mant = val & 0x1fffff;

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

  184.     if (val & 0x80000000)

  185.         mant = -mant;

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

  187. }

  188. 

  189. 

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

  191. 

  192. static void vorbis_free(vorbis_context *vc)

  193. {

  194.     int i;

  195. 

  196.     av_freep(&vc->channel_residues);

  197.     av_freep(&vc->channel_floors);

  198.     av_freep(&vc->saved);

  199. 

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

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

  202.     av_freep(&vc->residues);

  203.     av_freep(&vc->modes);

  204. 

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

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

  207. 

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

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

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

  211.     }

  212.     av_freep(&vc->codebooks);

  213. 

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

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

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

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

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

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

  220.         } else {

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

  222.         }

  223.     }

  224.     av_freep(&vc->floors);

  225. 

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

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

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

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

  230.     }

  231.     av_freep(&vc->mappings);

  232. }

  233. 

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

  235. 

  236. // Process codebooks part

  237. 

  238. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  239. {

  240.     unsigned cb;

  241.     uint8_t  *tmp_vlc_bits;

  242.     uint32_t *tmp_vlc_codes;

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

  244.     uint16_t *codebook_multiplicands;

  245. 

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

  247. 

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

  249. 

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

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

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

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

  254. 

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

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

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

  258. 

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

  260. 

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

  262.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  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.             goto error;

  273.         }

  274.         entries = get_bits(gb, 24);

  275.         if (entries > V_MAX_VLCS) {

  276.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  278.                    cb, entries);

  279.             goto error;

  280.         }

  281. 

  282.         ordered = get_bits1(gb);

  283. 

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

  285.                  codebook_setup->dimensions, entries);

  286. 

  287.         if (!ordered) {

  288.             unsigned ce, flag;

  289.             unsigned sparse = get_bits1(gb);

  290. 

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

  292. 

  293.             if (sparse) {

  294.                 AV_DEBUG(" sparse \n");

  295. 

  296.                 used_entries = 0;

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

  298.                     flag = get_bits1(gb);

  299.                     if (flag) {

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

  301.                         ++used_entries;

  302.                     } else

  303.                         tmp_vlc_bits[ce] = 0;

  304.                 }

  305.             } else {

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

  307. 

  308.                 used_entries = entries;

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

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

  311.             }

  312.         } else {

  313.             unsigned current_entry  = 0;

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

  315. 

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

  317. 

  318.             used_entries = entries;

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

  320.                 unsigned i, number;

  321. 

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

  323. 

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

  325. 

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

  327. 

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

  329.                     if (i < used_entries)

  330.                         tmp_vlc_bits[i] = current_length;

  331. 

  332.                 current_entry+=number;

  333.             }

  334.             if (current_entry>used_entries) {

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

  336.                 goto error;

  337.             }

  338.         }

  339. 

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

  341. 

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

  343. 

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

  345. 

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

  347.             unsigned i, j, k;

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

  349. 

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

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

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

  353.             unsigned codebook_sequence_p = get_bits1(gb);

  354. 

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

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

  357. 

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

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

  360. 

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

  362.                 AV_DEBUG(" multiplicand %u\n", codebook_multiplicands[i]);

  363.             }

  364. 

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

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

  367.                                                                     codebook_setup->dimensions *

  368.                                                                     sizeof(*codebook_setup->codevectors))

  369.                                                        : NULL;

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

  371.                 unsigned dim = codebook_setup->dimensions;

  372. 

  373.                 if (tmp_vlc_bits[i]) {

  374.                     float last = 0.0;

  375.                     unsigned lookup_offset = i;

  376. 

  377. #ifdef V_DEBUG

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

  379. #endif

  380. 

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

  382.                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  384.                         if (codebook_sequence_p)

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

  386.                         lookup_offset/=codebook_lookup_values;

  387.                     }

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

  389. 

  390. #ifdef V_DEBUG

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

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

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

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

  395. #endif

  396. 

  397.                     ++j;

  398.                 }

  399.             }

  400.             if (j != used_entries) {

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

  402.                 goto error;

  403.             }

  404.             entries = used_entries;

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

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

  407.             goto error;

  408.         }

  409. 

  410. // Initialize VLC table

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

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

  413.             goto error;

  414.         }

  415.         codebook_setup->maxdepth = 0;

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

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

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

  419. 

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

  421.             codebook_setup->nb_bits = V_NB_BITS2;

  422.         else

  423.             codebook_setup->nb_bits = V_NB_BITS;

  424. 

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

  426. 

  427.         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)) {

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

  429.             goto error;

  430.         }

  431.     }

  432. 

  433.     av_free(tmp_vlc_bits);

  434.     av_free(tmp_vlc_codes);

  435.     av_free(codebook_multiplicands);

  436.     return 0;

  437. 

  438. // Error:

  439. error:

  440.     av_free(tmp_vlc_bits);

  441.     av_free(tmp_vlc_codes);

  442.     av_free(codebook_multiplicands);

  443.     return -1;

  444. }

  445. 

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

  447. 

  448. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  449. {

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

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

  452. 

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

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

  455. 

  456.         AV_DEBUG(" Vorbis time domain transform %u: %u\n",

  457.                  vorbis_time_count, vorbis_tdtransform);

  458. 

  459.         if (vorbis_tdtransform) {

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

  461.             return -1;

  462.         }

  463.     }

  464.     return 0;

  465. }

  466. 

  467. // Process floors part

  468. 

  469. static int vorbis_floor0_decode(vorbis_context *vc,

  470.                                 vorbis_floor_data *vfu, float *vec);

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

  472. static int vorbis_floor1_decode(vorbis_context *vc,

  473.                                 vorbis_floor_data *vfu, float *vec);

  474. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  475. {

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

  477.     int i,j,k;

  478. 

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

  480. 

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

  482. 

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

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

  485. 

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

  487. 

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

  489. 

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

  491.             int maximum_class = -1;

  492.             unsigned rangebits, rangemax, floor1_values = 2;

  493. 

  494.             floor_setup->decode = vorbis_floor1_decode;

  495. 

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

  497. 

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

  499. 

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

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

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

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

  504. 

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

  506. 

  507.             }

  508. 

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

  510. 

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

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

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

  514. 

  515.                 AV_DEBUG(" %d floor %d class dim: %d subclasses %d \n", i, j, floor_setup->data.t1.class_dimensions[j], floor_setup->data.t1.class_subclasses[j]);

  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_DEBUG("   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_DEBUG("    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_DEBUG(" %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. #ifdef V_DEBUG /* debug output parsed headers */

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

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

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

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

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

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

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

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

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

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

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

  628.                              idx+1,

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

  630.                 }

  631.             }

  632. #endif

  633.         } else {

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

  635.             return -1;

  636.         }

  637.     }

  638.     return 0;

  639. }

  640. 

  641. // Process residues part

  642. 

  643. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  644. {

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

  646.     unsigned i, j, k;

  647. 

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

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

  650. 

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

  652. 

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

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

  655.         uint8_t cascade[64];

  656.         unsigned high_bits, low_bits;

  657. 

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

  659. 

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

  661. 

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

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

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

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

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

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

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

  669.             av_log(vc->avccontext, AV_LOG_ERROR,

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

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

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

  673.             return -1;

  674.         }

  675. 

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

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

  678. 

  679.         res_setup->ptns_to_read =

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

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

  682.                                         vc->audio_channels *

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

  684.         if (!res_setup->classifs)

  685.             return AVERROR(ENOMEM);

  686. 

  687.         AV_DEBUG("    begin %d end %d part.size %d classif.s %d classbook %d \n", res_setup->begin, res_setup->end, res_setup->partition_size,

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

  689. 

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

  691.             high_bits = 0;

  692.             low_bits  = get_bits(gb, 3);

  693.             if (get_bits1(gb))

  694.                 high_bits = get_bits(gb, 5);

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

  696. 

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

  698.         }

  699. 

  700.         res_setup->maxpass = 0;

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

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

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

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

  705. 

  706.                     AV_DEBUG("     %u class cascade depth %u book: %d\n",

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

  708. 

  709.                     if (k>res_setup->maxpass)

  710.                         res_setup->maxpass = k;

  711.                 } else {

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

  713.                 }

  714.             }

  715.         }

  716.     }

  717.     return 0;

  718. }

  719. 

  720. // Process mappings part

  721. 

  722. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  723. {

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

  725.     unsigned i, j;

  726. 

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

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

  729. 

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

  731. 

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

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

  734. 

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

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

  737.             return -1;

  738.         }

  739.         if (get_bits1(gb)) {

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

  741.         } else {

  742.             mapping_setup->submaps = 1;

  743.         }

  744. 

  745.         if (get_bits1(gb)) {

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

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

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

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

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

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

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

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

  754.             }

  755.         } else {

  756.             mapping_setup->coupling_steps = 0;

  757.         }

  758. 

  759.         AV_DEBUG("   %u mapping coupling steps: %d\n",

  760.                  i, mapping_setup->coupling_steps);

  761. 

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

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

  764.             return -1; // following spec.

  765.         }

  766. 

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

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

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

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

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

  772.         }

  773. 

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

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

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

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

  778. 

  779.             AV_DEBUG("   %u mapping %u submap : floor %d, residue %d\n",

  780.                      i, j,

  781.                      mapping_setup->submap_floor[j],

  782.                      mapping_setup->submap_residue[j]);

  783.         }

  784.     }

  785.     return 0;

  786. }

  787. 

  788. // Process modes part

  789. 

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

  791. {

  792.     vorbis_floor *floors = vc->floors;

  793.     vorbis_floor0 *vf;

  794.     int idx;

  795.     int blockflag, n;

  796.     int32_t *map;

  797. 

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

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

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

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

  802. 

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

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

  805. 

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

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

  808.                              ((vf->bark_map_size) /

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

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

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

  812.         }

  813.         map[n] = -1;

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

  815.     }

  816. 

  817. #ifdef V_DEBUG

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

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

  820.                  idx, map[idx]);

  821.     }

  822. #endif

  823. }

  824. 

  825. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  826. {

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

  828.     unsigned i;

  829. 

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

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

  832. 

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

  834. 

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

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

  837. 

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

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

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

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

  842. 

  843.         AV_DEBUG(" %u mode: blockflag %d, windowtype %d, transformtype %d, mapping %d\n",

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

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

  846.     }

  847.     return 0;

  848. }

  849. 

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

  851. 

  852. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  853. {

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

  855. 

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

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

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

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

  860.         return -1;

  861.     }

  862. 

  863.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  865.         return -2;

  866.     }

  867.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  869.         return -3;

  870.     }

  871.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  873.         return -4;

  874.     }

  875.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  877.         return -5;

  878.     }

  879.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  881.         return -6;

  882.     }

  883.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  885.         return -7;

  886.     }

  887.     if (!get_bits1(gb)) {

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

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

  890.     }

  891. 

  892.     return 0;

  893. }

  894. 

  895. // Process the identification header

  896. 

  897. static int vorbis_parse_id_hdr(vorbis_context *vc)

  898. {

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

  900.     unsigned bl0, bl1;

  901. 

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

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

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

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

  906.         return -1;

  907.     }

  908. 

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

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

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

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

  913.         return -1;

  914.     }

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

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

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

  918.         return -1;

  919.     }

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

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

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

  923.     bl0 = get_bits(gb, 4);

  924.     bl1 = get_bits(gb, 4);

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

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

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

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

  929.         return -3;

  930.     }

  931.     // output format int16

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

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

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

  935.         return -4;

  936.     }

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

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

  939. 

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

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

  942.         return -2;

  943.     }

  944. 

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

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

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

  948.     vc->previous_window  = 0;

  949. 

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

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

  952. 

  953.     AV_DEBUG(" vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",

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

  955. 

  956. /*

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

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

  959.         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)));

  960.     }

  961. */

  962. 

  963.     return 0;

  964. }

  965. 

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

  967. 

  968. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  969. {

  970.     vorbis_context *vc = avccontext->priv_data ;

  971.     uint8_t *headers   = avccontext->extradata;

  972.     int headers_len    = avccontext->extradata_size;

  973.     uint8_t *header_start[3];

  974.     int header_len[3];

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

  976.     int hdr_type;

  977. 

  978.     vc->avccontext = avccontext;

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

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

  981. 

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

  983.         avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;

  984.         vc->scale_bias = 1.0f;

  985.     } else {

  986.         avccontext->sample_fmt = AV_SAMPLE_FMT_S16;

  987.         vc->scale_bias = 32768.0f;

  988.     }

  989. 

  990.     if (!headers_len) {

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

  992.         return -1;

  993.     }

  994. 

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

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

  997.         return -1;

  998.     }

  999. 

  1000.     init_get_bits(gb, header_start[0], header_len[0]*8);

  1001.     hdr_type = get_bits(gb, 8);

  1002.     if (hdr_type != 1) {

  1003.         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");

  1004.         return -1;

  1005.     }

  1006.     if (vorbis_parse_id_hdr(vc)) {

  1007.         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");

  1008.         vorbis_free(vc);

  1009.         return -1;

  1010.     }

  1011. 

  1012.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1013.     hdr_type = get_bits(gb, 8);

  1014.     if (hdr_type != 5) {

  1015.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1016.         vorbis_free(vc);

  1017.         return -1;

  1018.     }

  1019.     if (vorbis_parse_setup_hdr(vc)) {

  1020.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1021.         vorbis_free(vc);

  1022.         return -1;

  1023.     }

  1024. 

  1025.     if (vc->audio_channels > 8)

  1026.         avccontext->channel_layout = 0;

  1027.     else

  1028.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1029. 

  1030.     avccontext->channels    = vc->audio_channels;

  1031.     avccontext->sample_rate = vc->audio_samplerate;

  1032.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;

  1033. 

  1034.     return 0 ;

  1035. }

  1036. 

  1037. // Decode audiopackets -------------------------------------------------

  1038. 

  1039. // Read and decode floor

  1040. 

  1041. static int vorbis_floor0_decode(vorbis_context *vc,

  1042.                                 vorbis_floor_data *vfu, float *vec)

  1043. {

  1044.     vorbis_floor0 *vf = &vfu->t0;

  1045.     float *lsp = vf->lsp;

  1046.     unsigned amplitude, book_idx;

  1047.     unsigned blockflag = vc->modes[vc->mode_number].blockflag;

  1048. 

  1049.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1050.     if (amplitude > 0) {

  1051.         float last = 0;

  1052.         unsigned idx, lsp_len = 0;

  1053.         vorbis_codebook codebook;

  1054. 

  1055.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1056.         if (book_idx >= vf->num_books) {

  1057.             av_log(vc->avccontext, AV_LOG_ERROR,

  1058.                     "floor0 dec: booknumber too high!\n");

  1059.             book_idx =  0;

  1060.         }

  1061.         AV_DEBUG("floor0 dec: booknumber: %u\n", book_idx);

  1062.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1063.         /* Invalid codebook! */

  1064.         if (!codebook.codevectors)

  1065.             return -1;

  1066. 

  1067.         while (lsp_len<vf->order) {

  1068.             int vec_off;

  1069. 

  1070.             AV_DEBUG("floor0 dec: book dimension: %d\n", codebook.dimensions);

  1071.             AV_DEBUG("floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1072.             /* read temp vector */

  1073.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1074.                                codebook.nb_bits, codebook.maxdepth)

  1075.                       * codebook.dimensions;

  1076.             AV_DEBUG("floor0 dec: vector offset: %d\n", vec_off);

  1077.             /* copy each vector component and add last to it */

  1078.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1079.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1080.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1081. 

  1082.             lsp_len += codebook.dimensions;

  1083.         }

  1084. #ifdef V_DEBUG

  1085.         /* DEBUG: output lsp coeffs */

  1086.         {

  1087.             int idx;

  1088.             for (idx = 0; idx < lsp_len; ++idx)

  1089.                 AV_DEBUG("floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1090.         }

  1091. #endif

  1092. 

  1093.         /* synthesize floor output vector */

  1094.         {

  1095.             int i;

  1096.             int order = vf->order;

  1097.             float wstep = M_PI / vf->bark_map_size;

  1098. 

  1099.             for (i = 0; i < order; i++)

  1100.                 lsp[i] = 2.0f * cos(lsp[i]);

  1101. 

  1102.             AV_DEBUG("floor0 synth: map_size = %d; m = %d; wstep = %f\n",

  1103.                      vf->map_size, order, wstep);

  1104. 

  1105.             i = 0;

  1106.             while (i < vf->map_size[blockflag]) {

  1107.                 int j, iter_cond = vf->map[blockflag][i];

  1108.                 float p = 0.5f;

  1109.                 float q = 0.5f;

  1110.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1111. 

  1112.                 /* similar part for the q and p products */

  1113.                 for (j = 0; j + 1 < order; j += 2) {

  1114.                     q *= lsp[j]     - two_cos_w;

  1115.                     p *= lsp[j + 1] - two_cos_w;

  1116.                 }

  1117.                 if (j == order) { // even order

  1118.                     p *= p * (2.0f - two_cos_w);

  1119.                     q *= q * (2.0f + two_cos_w);

  1120.                 } else { // odd order

  1121.                     q *= two_cos_w-lsp[j]; // one more time for q

  1122. 

  1123.                     /* final step and square */

  1124.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1125.                     q *= q;

  1126.                 }

  1127. 

  1128.                 /* calculate linear floor value */

  1129.                 q = exp((((amplitude*vf->amplitude_offset) /

  1130.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1131.                          - vf->amplitude_offset) * .11512925f);

  1132. 

  1133.                 /* fill vector */

  1134.                 do {

  1135.                     vec[i] = q; ++i;

  1136.                 } while (vf->map[blockflag][i] == iter_cond);

  1137.             }

  1138.         }

  1139.     } else {

  1140.         /* this channel is unused */

  1141.         return 1;

  1142.     }

  1143. 

  1144.     AV_DEBUG(" Floor0 decoded\n");

  1145. 

  1146.     return 0;

  1147. }

  1148. 

  1149. static int vorbis_floor1_decode(vorbis_context *vc,

  1150.                                 vorbis_floor_data *vfu, float *vec)

  1151. {

  1152.     vorbis_floor1 *vf = &vfu->t1;

  1153.     GetBitContext *gb = &vc->gb;

  1154.     uint16_t range_v[4] = { 256, 128, 86, 64 };

  1155.     unsigned range = range_v[vf->multiplier - 1];

  1156.     uint16_t floor1_Y[258];

  1157.     uint16_t floor1_Y_final[258];

  1158.     int floor1_flag[258];

  1159.     unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;

  1160.     int book, adx, ady, dy, off, predicted, err;

  1161. 

  1162. 

  1163.     if (!get_bits1(gb)) // silence

  1164.         return 1;

  1165. 

  1166. // Read values (or differences) for the floor's points

  1167. 

  1168.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1169.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1170. 

  1171.     AV_DEBUG("floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1172. 

  1173.     offset = 2;

  1174.     for (i = 0; i < vf->partitions; ++i) {

  1175.         partition_class = vf->partition_class[i];

  1176.         cdim   = vf->class_dimensions[partition_class];

  1177.         cbits  = vf->class_subclasses[partition_class];

  1178.         csub = (1 << cbits) - 1;

  1179.         cval = 0;

  1180. 

  1181.         AV_DEBUG("Cbits %u\n", cbits);

  1182. 

  1183.         if (cbits) // this reads all subclasses for this partition's class

  1184.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,

  1185.                             vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);

  1186. 

  1187.         for (j = 0; j < cdim; ++j) {

  1188.             book = vf->subclass_books[partition_class][cval & csub];

  1189. 

  1190.             AV_DEBUG("book %d Cbits %u cval %u  bits:%d\n",

  1191.                      book, cbits, cval, get_bits_count(gb));

  1192. 

  1193.             cval = cval >> cbits;

  1194.             if (book > -1) {

  1195.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1196.                 vc->codebooks[book].nb_bits, 3);

  1197.             } else {

  1198.                 floor1_Y[offset+j] = 0;

  1199.             }

  1200. 

  1201.             AV_DEBUG(" floor(%d) = %d \n", vf->list[offset+j].x, floor1_Y[offset+j]);

  1202.         }

  1203.         offset+=cdim;

  1204.     }

  1205. 

  1206. // Amplitude calculation from the differences

  1207. 

  1208.     floor1_flag[0] = 1;

  1209.     floor1_flag[1] = 1;

  1210.     floor1_Y_final[0] = floor1_Y[0];

  1211.     floor1_Y_final[1] = floor1_Y[1];

  1212. 

  1213.     for (i = 2; i < vf->x_list_dim; ++i) {

  1214.         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;

  1215. 

  1216.         low_neigh_offs  = vf->list[i].low;

  1217.         high_neigh_offs = vf->list[i].high;

  1218.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1219.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1220.         ady = FFABS(dy);

  1221.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1222.         off = err / adx;

  1223.         if (dy < 0) {

  1224.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1225.         } else {

  1226.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1227.         } // render_point end

  1228. 

  1229.         val = floor1_Y[i];

  1230.         highroom = range-predicted;

  1231.         lowroom  = predicted;

  1232.         if (highroom < lowroom) {

  1233.             room = highroom * 2;

  1234.         } else {

  1235.             room = lowroom * 2;   // SPEC mispelling

  1236.         }

  1237.         if (val) {

  1238.             floor1_flag[low_neigh_offs]  = 1;

  1239.             floor1_flag[high_neigh_offs] = 1;

  1240.             floor1_flag[i]               = 1;

  1241.             if (val >= room) {

  1242.                 if (highroom > lowroom) {

  1243.                     floor1_Y_final[i] = val - lowroom + predicted;

  1244.                 } else {

  1245.                     floor1_Y_final[i] = predicted - val + highroom - 1;

  1246.                 }

  1247.             } else {

  1248.                 if (val & 1) {

  1249.                     floor1_Y_final[i] = predicted - (val + 1) / 2;

  1250.                 } else {

  1251.                     floor1_Y_final[i] = predicted + val / 2;

  1252.                 }

  1253.             }

  1254.         } else {

  1255.             floor1_flag[i]    = 0;

  1256.             floor1_Y_final[i] = predicted;

  1257.         }

  1258. 

  1259.         AV_DEBUG(" Decoded floor(%d) = %u / val %u\n",

  1260.                  vf->list[i].x, floor1_Y_final[i], val);

  1261.     }

  1262. 

  1263. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1264. 

  1265.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1266. 

  1267.     AV_DEBUG(" Floor decoded\n");

  1268. 

  1269.     return 0;

  1270. }

  1271. 

  1272. // Read and decode residue

  1273. 

  1274. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1275.                                                            vorbis_residue *vr,

  1276.                                                            unsigned ch,

  1277.                                                            uint8_t *do_not_decode,

  1278.                                                            float *vec,

  1279.                                                            unsigned vlen,

  1280.                                                            int vr_type)

  1281. {

  1282.     GetBitContext *gb = &vc->gb;

  1283.     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;

  1284.     unsigned ptns_to_read = vr->ptns_to_read;

  1285.     uint8_t *classifs = vr->classifs;

  1286.     unsigned pass, ch_used, i, j, k, l;

  1287. 

  1288.     if (vr_type == 2) {

  1289.         for (j = 1; j < ch; ++j)

  1290.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1291.         if (do_not_decode[0])

  1292.             return 0;

  1293.         ch_used = 1;

  1294.     } else {

  1295.         ch_used = ch;

  1296.     }

  1297. 

  1298.     AV_DEBUG(" residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1299. 

  1300.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1301.         uint16_t voffset, partition_count, j_times_ptns_to_read;

  1302. 

  1303.         voffset = vr->begin;

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

  1305.             if (!pass) {

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

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

  1308.                     if (!do_not_decode[j]) {

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

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

  1311. 

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

  1313. 

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

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

  1316.                             unsigned temp2;

  1317. 

  1318.                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;

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

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

  1321.                             temp = temp2;

  1322.                         }

  1323.                     }

  1324.                     j_times_ptns_to_read += ptns_to_read;

  1325.                 }

  1326.             }

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

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

  1329.                     unsigned voffs;

  1330. 

  1331.                     if (!do_not_decode[j]) {

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

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

  1334. 

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

  1336.                             unsigned coffs;

  1337.                             unsigned dim  = vc->codebooks[vqbook].dimensions;

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

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

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

  1341. 

  1342.                             if (vr_type == 0) {

  1343. 

  1344.                                 voffs = voffset+j*vlen;

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

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

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

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

  1349.                                 }

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

  1351.                                 voffs = voffset + j * vlen;

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

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

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

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

  1356. 

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

  1358.                                     }

  1359.                                 }

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

  1361.                                 voffs = voffset >> 1;

  1362. 

  1363.                                 if (dim == 2) {

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

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

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

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

  1368.                                     }

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

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

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

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

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

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

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

  1376.                                     }

  1377.                                 } else

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

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

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

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

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

  1383. 

  1384.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset / ch + (voffs % ch) * vlen, vec[voffset / ch + (voffs % ch) * vlen], codebook.codevectors[coffs + l], coffs, l);

  1385.                                     }

  1386.                                 }

  1387. 

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

  1389.                                 voffs = voffset;

  1390. 

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

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

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

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

  1395. 

  1396.                                         AV_DEBUG(" pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n", pass, voffset / ch + (voffs % ch) * vlen, vec[voffset / ch + (voffs % ch) * vlen], codebook.codevectors[coffs + l], coffs, l);

  1397.                                     }

  1398.                                 }

  1399.                             }

  1400.                         }

  1401.                     }

  1402.                     j_times_ptns_to_read += ptns_to_read;

  1403.                 }

  1404.                 ++partition_count;

  1405.                 voffset += vr->partition_size;

  1406.             }

  1407.         }

  1408.     }

  1409.     return 0;

  1410. }

  1411. 

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

  1413.                                         unsigned ch,

  1414.                                         uint8_t *do_not_decode,

  1415.                                         float *vec, unsigned vlen)

  1416. {

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

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

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

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

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

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

  1423.     else {

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

  1425.         return -1;

  1426.     }

  1427. }

  1428. 

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

  1430. {

  1431.     int i;

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

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

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

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

  1436.             } else {

  1437.                 float temp = ang[i];

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

  1439.                 mag[i]    += temp;

  1440.             }

  1441.         } else {

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

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

  1444.             } else {

  1445.                 float temp = ang[i];

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

  1447.                 mag[i]    -= temp;

  1448.             }

  1449.         }

  1450.     }

  1451. }

  1452. 

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

  1454. 

  1455. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1456. {

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

  1458.     FFTContext *mdct;

  1459.     unsigned previous_window = vc->previous_window;

  1460.     unsigned mode_number, blockflag, blocksize;

  1461.     int i, j;

  1462.     uint8_t no_residue[255];

  1463.     uint8_t do_not_decode[255];

  1464.     vorbis_mapping *mapping;

  1465.     float *ch_res_ptr   = vc->channel_residues;

  1466.     float *ch_floor_ptr = vc->channel_floors;

  1467.     uint8_t res_chan[255];

  1468.     unsigned res_num = 0;

  1469.     int retlen  = 0;

  1470. 

  1471.     if (get_bits1(gb)) {

  1472.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1473.         return -1; // packet type not audio

  1474.     }

  1475. 

  1476.     if (vc->mode_count == 1) {

  1477.         mode_number = 0;

  1478.     } else {

  1479.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1480.     }

  1481.     vc->mode_number = mode_number;

  1482.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1483. 

  1484.     AV_DEBUG(" Mode number: %u , mapping: %d , blocktype %d\n", mode_number,

  1485.              vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1486. 

  1487.     blockflag = vc->modes[mode_number].blockflag;

  1488.     blocksize = vc->blocksize[blockflag];

  1489.     if (blockflag)

  1490.         skip_bits(gb, 2); // previous_window, next_window

  1491. 

  1492.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

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

  1494. 

  1495. // Decode floor

  1496. 

  1497.     for (i = 0; i < vc->audio_channels; ++i) {

  1498.         vorbis_floor *floor;

  1499.         int ret;

  1500.         if (mapping->submaps > 1) {

  1501.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1502.         } else {

  1503.             floor = &vc->floors[mapping->submap_floor[0]];

  1504.         }

  1505. 

  1506.         ret = floor->decode(vc, &floor->data, ch_floor_ptr);

  1507. 

  1508.         if (ret < 0) {

  1509.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1510.             return -1;

  1511.         }

  1512.         no_residue[i] = ret;

  1513.         ch_floor_ptr += blocksize / 2;

  1514.     }

  1515. 

  1516. // Nonzero vector propagate

  1517. 

  1518.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1519.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1520.             no_residue[mapping->magnitude[i]] = 0;

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

  1522.         }

  1523.     }

  1524. 

  1525. // Decode residue

  1526. 

  1527.     for (i = 0; i < mapping->submaps; ++i) {

  1528.         vorbis_residue *residue;

  1529.         unsigned ch = 0;

  1530. 

  1531.         for (j = 0; j < vc->audio_channels; ++j) {

  1532.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1533.                 res_chan[j] = res_num;

  1534.                 if (no_residue[j]) {

  1535.                     do_not_decode[ch] = 1;

  1536.                 } else {

  1537.                     do_not_decode[ch] = 0;

  1538.                 }

  1539.                 ++ch;

  1540.                 ++res_num;

  1541.             }

  1542.         }

  1543.         residue = &vc->residues[mapping->submap_residue[i]];

  1544.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1545. 

  1546.         ch_res_ptr += ch * blocksize / 2;

  1547.     }

  1548. 

  1549. // Inverse coupling

  1550. 

  1551.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1552.         float *mag, *ang;

  1553. 

  1554.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

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

  1556.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1557.     }

  1558. 

  1559. // Dotproduct, MDCT

  1560. 

  1561.     mdct = &vc->mdct[blockflag];

  1562. 

  1563.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1564.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;

  1565.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1566.         vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);

  1567.         mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);

  1568.     }

  1569. 

  1570. // Overlap/add, save data for next overlapping  FPMATH

  1571. 

  1572.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

  1573.     for (j = 0; j < vc->audio_channels; j++) {

  1574.         unsigned bs0 = vc->blocksize[0];

  1575.         unsigned bs1 = vc->blocksize[1];

  1576.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1577.         float *saved      = vc->saved + j * bs1 / 4;

  1578.         float *ret        = vc->channel_floors + j * retlen;

  1579.         float *buf        = residue;

  1580.         const float *win  = vc->win[blockflag & previous_window];

  1581. 

  1582.         if (blockflag == previous_window) {

  1583.             vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);

  1584.         } else if (blockflag > previous_window) {

  1585.             vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);

  1586.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1587.         } else {

  1588.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1589.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);

  1590.         }

  1591.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1592.     }

  1593. 

  1594.     vc->previous_window = blockflag;

  1595.     return retlen;

  1596. }

  1597. 

  1598. // Return the decoded audio packet through the standard api

  1599. 

  1600. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1601.                                void *data, int *data_size,

  1602.                                AVPacket *avpkt)

  1603. {

  1604.     const uint8_t *buf = avpkt->data;

  1605.     int buf_size       = avpkt->size;

  1606.     vorbis_context *vc = avccontext->priv_data ;

  1607.     GetBitContext *gb = &(vc->gb);

  1608.     const float *channel_ptrs[255];

  1609.     int i, len;

  1610. 

  1611.     if (!buf_size)

  1612.         return 0;

  1613. 

  1614.     AV_DEBUG("packet length %d \n", buf_size);

  1615. 

  1616.     init_get_bits(gb, buf, buf_size*8);

  1617. 

  1618.     len = vorbis_parse_audio_packet(vc);

  1619. 

  1620.     if (len <= 0) {

  1621.         *data_size = 0;

  1622.         return buf_size;

  1623.     }

  1624. 

  1625.     if (!vc->first_frame) {

  1626.         vc->first_frame = 1;

  1627.         *data_size = 0;

  1628.         return buf_size ;

  1629.     }

  1630. 

  1631.     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);

  1632. 

  1633.     if (vc->audio_channels > 8) {

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

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

  1636.     } else {

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

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

  1639.                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1640.     }

  1641. 

  1642.     if (avccontext->sample_fmt == AV_SAMPLE_FMT_FLT)

  1643.         vc->fmt_conv.float_interleave(data, channel_ptrs, len, vc->audio_channels);

  1644.     else

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

  1646.                                                vc->audio_channels);

  1647. 

  1648.     *data_size = len * vc->audio_channels *

  1649.                  (av_get_bits_per_sample_fmt(avccontext->sample_fmt) / 8);

  1650. 

  1651.     return buf_size ;

  1652. }

  1653. 

  1654. // Close decoder

  1655. 

  1656. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1657. {

  1658.     vorbis_context *vc = avccontext->priv_data;

  1659. 

  1660.     vorbis_free(vc);

  1661. 

  1662.     return 0 ;

  1663. }

  1664. 

  1665. AVCodec ff_vorbis_decoder = {

  1666.     "vorbis",

  1667.     AVMEDIA_TYPE_AUDIO,

  1668.     CODEC_ID_VORBIS,

  1669.     sizeof(vorbis_context),

  1670.     vorbis_decode_init,

  1671.     NULL,

  1672.     vorbis_decode_close,

  1673.     vorbis_decode_frame,

  1674.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1675.     .channel_layouts = ff_vorbis_channel_layouts,

  1676.     .sample_fmts = (const enum AVSampleFormat[]) {

  1677.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE

  1678.     },

  1679. };