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FFmpeg/libavcodec/vorbisdec.c

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  1. /*

  2.  * This file is part of Libav.

  3.  *

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

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

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

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

  8.  *

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

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

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

  12.  * Lesser General Public License for more details.

  13.  *

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

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

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

  17.  */

  18. 

  19. /**

  20.  * @file

  21.  * Vorbis I decoder

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

  23.  */

  24. 

  25. #include <inttypes.h>

  26. #include <math.h>

  27. 

  28. #define BITSTREAM_READER_LE

  29. #include "libavutil/float_dsp.h"

  30. #include "avcodec.h"

  31. #include "get_bits.h"

  32. #include "fft.h"

  33. #include "fmtconvert.h"

  34. #include "internal.h"

  35. 

  36. #include "vorbis.h"

  37. #include "vorbisdsp.h"

  38. #include "xiph.h"

  39. 

  40. #define V_NB_BITS 8

  41. #define V_NB_BITS2 11

  42. #define V_MAX_VLCS (1 << 16)

  43. #define V_MAX_PARTITIONS (1 << 20)

  44. 

  45. #undef NDEBUG

  46. #include <assert.h>

  47. 

  48. typedef struct {

  49.     uint8_t      dimensions;

  50.     uint8_t      lookup_type;

  51.     uint8_t      maxdepth;

  52.     VLC          vlc;

  53.     float       *codevectors;

  54.     unsigned int nb_bits;

  55. } vorbis_codebook;

  56. 

  57. typedef union  vorbis_floor_u  vorbis_floor_data;

  58. typedef struct vorbis_floor0_s vorbis_floor0;

  59. typedef struct vorbis_floor1_s vorbis_floor1;

  60. struct vorbis_context_s;

  61. typedef

  62. int (* vorbis_floor_decode_func)

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

  64. typedef struct {

  65.     uint8_t floor_type;

  66.     vorbis_floor_decode_func decode;

  67.     union vorbis_floor_u {

  68.         struct vorbis_floor0_s {

  69.             uint8_t       order;

  70.             uint16_t      rate;

  71.             uint16_t      bark_map_size;

  72.             int32_t      *map[2];

  73.             uint32_t      map_size[2];

  74.             uint8_t       amplitude_bits;

  75.             uint8_t       amplitude_offset;

  76.             uint8_t       num_books;

  77.             uint8_t      *book_list;

  78.             float        *lsp;

  79.         } t0;

  80.         struct vorbis_floor1_s {

  81.             uint8_t       partitions;

  82.             uint8_t       partition_class[32];

  83.             uint8_t       class_dimensions[16];

  84.             uint8_t       class_subclasses[16];

  85.             uint8_t       class_masterbook[16];

  86.             int16_t       subclass_books[16][8];

  87.             uint8_t       multiplier;

  88.             uint16_t      x_list_dim;

  89.             vorbis_floor1_entry *list;

  90.         } t1;

  91.     } data;

  92. } vorbis_floor;

  93. 

  94. typedef struct {

  95.     uint16_t      type;

  96.     uint32_t      begin;

  97.     uint32_t      end;

  98.     unsigned      partition_size;

  99.     uint8_t       classifications;

  100.     uint8_t       classbook;

  101.     int16_t       books[64][8];

  102.     uint8_t       maxpass;

  103.     uint16_t      ptns_to_read;

  104.     uint8_t      *classifs;

  105. } vorbis_residue;

  106. 

  107. typedef struct {

  108.     uint8_t       submaps;

  109.     uint16_t      coupling_steps;

  110.     uint8_t      *magnitude;

  111.     uint8_t      *angle;

  112.     uint8_t      *mux;

  113.     uint8_t       submap_floor[16];

  114.     uint8_t       submap_residue[16];

  115. } vorbis_mapping;

  116. 

  117. typedef struct {

  118.     uint8_t       blockflag;

  119.     uint16_t      windowtype;

  120.     uint16_t      transformtype;

  121.     uint8_t       mapping;

  122. } vorbis_mode;

  123. 

  124. typedef struct vorbis_context_s {

  125.     AVCodecContext *avctx;

  126.     GetBitContext gb;

  127.     VorbisDSPContext dsp;

  128.     AVFloatDSPContext fdsp;

  129.     FmtConvertContext fmt_conv;

  130. 

  131.     FFTContext mdct[2];

  132.     uint8_t       first_frame;

  133.     uint32_t      version;

  134.     uint8_t       audio_channels;

  135.     uint32_t      audio_samplerate;

  136.     uint32_t      bitrate_maximum;

  137.     uint32_t      bitrate_nominal;

  138.     uint32_t      bitrate_minimum;

  139.     uint32_t      blocksize[2];

  140.     const float  *win[2];

  141.     uint16_t      codebook_count;

  142.     vorbis_codebook *codebooks;

  143.     uint8_t       floor_count;

  144.     vorbis_floor *floors;

  145.     uint8_t       residue_count;

  146.     vorbis_residue *residues;

  147.     uint8_t       mapping_count;

  148.     vorbis_mapping *mappings;

  149.     uint8_t       mode_count;

  150.     vorbis_mode  *modes;

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

  152.     uint8_t       previous_window;

  153.     float        *channel_residues;

  154.     float        *saved;

  155. } vorbis_context;

  156. 

  157. /* Helper functions */

  158. 

  159. #define BARK(x) \

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

  161. 

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

  163. #define VALIDATE_INDEX(idx, limit) \

  164.     if (idx >= limit) {\

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

  166.                idx_err_str,\

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

  168.         return AVERROR_INVALIDDATA;\

  169.     }

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

  171.     {\

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

  173.         VALIDATE_INDEX(idx, limit)\

  174.     }

  175. 

  176. static float vorbisfloat2float(unsigned val)

  177. {

  178.     double mant = val & 0x1fffff;

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

  180.     if (val & 0x80000000)

  181.         mant = -mant;

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

  183. }

  184. 

  185. 

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

  187. 

  188. static void vorbis_free(vorbis_context *vc)

  189. {

  190.     int i;

  191. 

  192.     av_freep(&vc->channel_residues);

  193.     av_freep(&vc->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.         ff_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  = NULL;

  237.     uint32_t *tmp_vlc_codes = NULL;

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

  239.     uint16_t *codebook_multiplicands = NULL;

  240.     int ret = 0;

  241. 

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

  243. 

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

  245. 

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

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

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

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

  250.     if (!vc->codebooks ||

  251.         !tmp_vlc_bits || !tmp_vlc_codes || !codebook_multiplicands) {

  252.         ret = AVERROR(ENOMEM);

  253.         goto error;

  254.     }

  255. 

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

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

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

  259. 

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

  261. 

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

  263.             av_log(vc->avctx, AV_LOG_ERROR,

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

  265.             ret = AVERROR_INVALIDDATA;

  266.             goto error;

  267.         }

  268. 

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

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

  271.             av_log(vc->avctx, AV_LOG_ERROR,

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

  273.                    cb, codebook_setup->dimensions);

  274.             ret = AVERROR_INVALIDDATA;

  275.             goto error;

  276.         }

  277.         entries = get_bits(gb, 24);

  278.         if (entries > V_MAX_VLCS) {

  279.             av_log(vc->avctx, AV_LOG_ERROR,

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

  281.                    cb, entries);

  282.             ret = AVERROR_INVALIDDATA;

  283.             goto error;

  284.         }

  285. 

  286.         ordered = get_bits1(gb);

  287. 

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

  289.                 codebook_setup->dimensions, entries);

  290. 

  291.         if (!ordered) {

  292.             unsigned ce, flag;

  293.             unsigned sparse = get_bits1(gb);

  294. 

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

  296. 

  297.             if (sparse) {

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

  299. 

  300.                 used_entries = 0;

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

  302.                     flag = get_bits1(gb);

  303.                     if (flag) {

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

  305.                         ++used_entries;

  306.                     } else

  307.                         tmp_vlc_bits[ce] = 0;

  308.                 }

  309.             } else {

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

  311. 

  312.                 used_entries = entries;

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

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

  315.             }

  316.         } else {

  317.             unsigned current_entry  = 0;

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

  319. 

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

  321. 

  322.             used_entries = entries;

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

  324.                 unsigned i, number;

  325. 

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

  327. 

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

  329. 

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

  331. 

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

  333.                     if (i < used_entries)

  334.                         tmp_vlc_bits[i] = current_length;

  335. 

  336.                 current_entry+=number;

  337.             }

  338.             if (current_entry>used_entries) {

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

  340.                 ret = AVERROR_INVALIDDATA;

  341.                 goto error;

  342.             }

  343.         }

  344. 

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

  346. 

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

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

  349. 

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

  351. 

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

  353.             unsigned i, j, k;

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

  355. 

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

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

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

  359.             unsigned codebook_sequence_p = get_bits1(gb);

  360. 

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

  362.                     codebook_lookup_values);

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

  364.                     codebook_delta_value, codebook_minimum_value);

  365. 

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

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

  368. 

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

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

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

  372.             }

  373. 

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

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

  376.                                                                     codebook_setup->dimensions *

  377.                                                                     sizeof(*codebook_setup->codevectors))

  378.                                                        : NULL;

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

  380.                 unsigned dim = codebook_setup->dimensions;

  381. 

  382.                 if (tmp_vlc_bits[i]) {

  383.                     float last = 0.0;

  384.                     unsigned lookup_offset = i;

  385. 

  386.                     av_dlog(vc->avctx, "Lookup offset %u ,", i);

  387. 

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

  389.                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  391.                         if (codebook_sequence_p)

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

  393.                         lookup_offset/=codebook_lookup_values;

  394.                     }

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

  396. 

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

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

  399.                         av_dlog(vc->avctx, " %f ",

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

  401.                     av_dlog(vc->avctx, "\n");

  402. 

  403.                     ++j;

  404.                 }

  405.             }

  406.             if (j != used_entries) {

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

  408.                 ret = AVERROR_INVALIDDATA;

  409.                 goto error;

  410.             }

  411.             entries = used_entries;

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

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

  414.             ret = AVERROR_INVALIDDATA;

  415.             goto error;

  416.         }

  417. 

  418. // Initialize VLC table

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

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

  421.             ret = AVERROR_INVALIDDATA;

  422.             goto error;

  423.         }

  424.         codebook_setup->maxdepth = 0;

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

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

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

  428. 

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

  430.             codebook_setup->nb_bits = V_NB_BITS2;

  431.         else

  432.             codebook_setup->nb_bits = V_NB_BITS;

  433. 

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

  435. 

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

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

  438.                             sizeof(*tmp_vlc_bits), tmp_vlc_codes,

  439.                             sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),

  440.                             INIT_VLC_LE))) {

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

  442.             goto error;

  443.         }

  444.     }

  445. 

  446.     av_free(tmp_vlc_bits);

  447.     av_free(tmp_vlc_codes);

  448.     av_free(codebook_multiplicands);

  449.     return 0;

  450. 

  451. // Error:

  452. error:

  453.     av_free(tmp_vlc_bits);

  454.     av_free(tmp_vlc_codes);

  455.     av_free(codebook_multiplicands);

  456.     return ret;

  457. }

  458. 

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

  460. 

  461. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  462. {

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

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

  465. 

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

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

  468. 

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

  470.                 vorbis_time_count, vorbis_tdtransform);

  471. 

  472.         if (vorbis_tdtransform) {

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

  474.             return AVERROR_INVALIDDATA;

  475.         }

  476.     }

  477.     return 0;

  478. }

  479. 

  480. // Process floors part

  481. 

  482. static int vorbis_floor0_decode(vorbis_context *vc,

  483.                                 vorbis_floor_data *vfu, float *vec);

  484. static int create_map(vorbis_context *vc, unsigned floor_number);

  485. static int vorbis_floor1_decode(vorbis_context *vc,

  486.                                 vorbis_floor_data *vfu, float *vec);

  487. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  488. {

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

  490.     int i, j, k, ret;

  491. 

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

  493. 

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

  495.     if (!vc->floors)

  496.         return AVERROR(ENOMEM);

  497. 

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

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

  500. 

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

  502. 

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

  504. 

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

  506.             int maximum_class = -1;

  507.             unsigned rangebits, rangemax, floor1_values = 2;

  508. 

  509.             floor_setup->decode = vorbis_floor1_decode;

  510. 

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

  512. 

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

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

  515. 

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

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

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

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

  520. 

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

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

  523. 

  524.             }

  525. 

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

  527. 

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

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

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

  531. 

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

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

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

  535. 

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

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

  538. 

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

  540.                 }

  541. 

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

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

  544.                     if (bits != -1)

  545.                         VALIDATE_INDEX(bits, vc->codebook_count)

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

  547. 

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

  549.                 }

  550.             }

  551. 

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

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

  554. 

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

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

  557. 

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

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

  560.             if (!floor_setup->data.t1.list)

  561.                 return AVERROR(ENOMEM);

  562. 

  563.             rangebits = get_bits(gb, 4);

  564.             rangemax = (1 << rangebits);

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

  566.                 av_log(vc->avctx, AV_LOG_ERROR,

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

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

  569.                 return AVERROR_INVALIDDATA;

  570.             }

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

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

  573. 

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

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

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

  577. 

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

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

  580.                 }

  581.             }

  582. 

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

  584.             if (ff_vorbis_ready_floor1_list(vc->avctx,

  585.                                             floor_setup->data.t1.list,

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

  587.                 return AVERROR_INVALIDDATA;

  588.             }

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

  590.             unsigned max_codebook_dim = 0;

  591. 

  592.             floor_setup->decode = vorbis_floor0_decode;

  593. 

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

  595.             if (!floor_setup->data.t0.order) {

  596.                 av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 order is 0.\n");

  597.                 return AVERROR_INVALIDDATA;

  598.             }

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

  600.             if (!floor_setup->data.t0.rate) {

  601.                 av_log(vc->avctx, AV_LOG_ERROR, "Floor 0 rate is 0.\n");

  602.                 return AVERROR_INVALIDDATA;

  603.             }

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

  605.             if (!floor_setup->data.t0.bark_map_size) {

  606.                 av_log(vc->avctx, AV_LOG_ERROR,

  607.                        "Floor 0 bark map size is 0.\n");

  608.                 return AVERROR_INVALIDDATA;

  609.             }

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

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

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

  613. 

  614.             /* allocate mem for booklist */

  615.             floor_setup->data.t0.book_list =

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

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

  618.                 return AVERROR(ENOMEM);

  619.             /* read book indexes */

  620.             {

  621.                 int idx;

  622.                 unsigned book_idx;

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

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

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

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

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

  628.                 }

  629.             }

  630. 

  631.             if ((ret = create_map(vc, i)) < 0)

  632.                 return ret;

  633. 

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

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

  636.             floor_setup->data.t0.lsp =

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

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

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

  640.                 return AVERROR(ENOMEM);

  641. 

  642.             /* debug output parsed headers */

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

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

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

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

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

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

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

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

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

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

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

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

  655.             {

  656.                 int idx;

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

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

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

  660.                 }

  661.             }

  662.         } else {

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

  664.             return AVERROR_INVALIDDATA;

  665.         }

  666.     }

  667.     return 0;

  668. }

  669. 

  670. // Process residues part

  671. 

  672. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  673. {

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

  675.     unsigned i, j, k;

  676. 

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

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

  679.     if (!vc->residues)

  680.         return AVERROR(ENOMEM);

  681. 

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

  683. 

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

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

  686.         uint8_t cascade[64];

  687.         unsigned high_bits, low_bits;

  688. 

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

  690. 

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

  692. 

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

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

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

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

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

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

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

  700.             av_log(vc->avctx, AV_LOG_ERROR,

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

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

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

  704.             return AVERROR_INVALIDDATA;

  705.         }

  706. 

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

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

  709. 

  710.         res_setup->ptns_to_read =

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

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

  713.                                         vc->audio_channels *

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

  715.         if (!res_setup->classifs)

  716.             return AVERROR(ENOMEM);

  717. 

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

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

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

  721. 

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

  723.             high_bits = 0;

  724.             low_bits  = get_bits(gb, 3);

  725.             if (get_bits1(gb))

  726.                 high_bits = get_bits(gb, 5);

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

  728. 

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

  730.         }

  731. 

  732.         res_setup->maxpass = 0;

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

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

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

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

  737. 

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

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

  740. 

  741.                     if (k>res_setup->maxpass)

  742.                         res_setup->maxpass = k;

  743.                 } else {

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

  745.                 }

  746.             }

  747.         }

  748.     }

  749.     return 0;

  750. }

  751. 

  752. // Process mappings part

  753. 

  754. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  755. {

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

  757.     unsigned i, j;

  758. 

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

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

  761.     if (!vc->mappings)

  762.         return AVERROR(ENOMEM);

  763. 

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

  765. 

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

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

  768. 

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

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

  771.             return AVERROR_INVALIDDATA;

  772.         }

  773.         if (get_bits1(gb)) {

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

  775.         } else {

  776.             mapping_setup->submaps = 1;

  777.         }

  778. 

  779.         if (get_bits1(gb)) {

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

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

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

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

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

  785.             if (!mapping_setup->angle || !mapping_setup->magnitude)

  786.                 return AVERROR(ENOMEM);

  787. 

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

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

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

  791.             }

  792.         } else {

  793.             mapping_setup->coupling_steps = 0;

  794.         }

  795. 

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

  797.                 i, mapping_setup->coupling_steps);

  798. 

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

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

  801.             return AVERROR_INVALIDDATA; // following spec.

  802.         }

  803. 

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

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

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

  807.             if (!mapping_setup->mux)

  808.                 return AVERROR(ENOMEM);

  809. 

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

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

  812.         }

  813. 

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

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

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

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

  818. 

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

  820.                     mapping_setup->submap_floor[j],

  821.                     mapping_setup->submap_residue[j]);

  822.         }

  823.     }

  824.     return 0;

  825. }

  826. 

  827. // Process modes part

  828. 

  829. static int create_map(vorbis_context *vc, unsigned floor_number)

  830. {

  831.     vorbis_floor *floors = vc->floors;

  832.     vorbis_floor0 *vf;

  833.     int idx;

  834.     int blockflag, n;

  835.     int32_t *map;

  836. 

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

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

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

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

  841.         if (!floors[floor_number].data.t0.map[blockflag])

  842.             return AVERROR(ENOMEM);

  843. 

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

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

  846. 

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

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

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

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

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

  852.         }

  853.         map[n] = -1;

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

  855.     }

  856. 

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

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

  859.     }

  860. 

  861.     return 0;

  862. }

  863. 

  864. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  865. {

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

  867.     unsigned i;

  868. 

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

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

  871.     if (!vc->modes)

  872.         return AVERROR(ENOMEM);

  873. 

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

  875. 

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

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

  878. 

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

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

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

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

  883. 

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

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

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

  887.     }

  888.     return 0;

  889. }

  890. 

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

  892. 

  893. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  894. {

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

  896.     int ret;

  897. 

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

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

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

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

  902.         return AVERROR_INVALIDDATA;

  903.     }

  904. 

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

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

  907.         return ret;

  908.     }

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

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

  911.         return ret;

  912.     }

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

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

  915.         return ret;

  916.     }

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

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

  919.         return ret;

  920.     }

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

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

  923.         return ret;

  924.     }

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

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

  927.         return ret;

  928.     }

  929.     if (!get_bits1(gb)) {

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

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

  932.     }

  933. 

  934.     return 0;

  935. }

  936. 

  937. // Process the identification header

  938. 

  939. static int vorbis_parse_id_hdr(vorbis_context *vc)

  940. {

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

  942.     unsigned bl0, bl1;

  943. 

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

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

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

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

  948.         return AVERROR_INVALIDDATA;

  949.     }

  950. 

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

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

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

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

  955.         return AVERROR_INVALIDDATA;

  956.     }

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

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

  959.         av_log(vc->avctx, AV_LOG_ERROR, "Invalid samplerate\n");

  960.         return AVERROR_INVALIDDATA;

  961.     }

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

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

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

  965.     bl0 = get_bits(gb, 4);

  966.     bl1 = get_bits(gb, 4);

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

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

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

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

  971.         return AVERROR_INVALIDDATA;

  972.     }

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

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

  975. 

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

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

  978.         return AVERROR_INVALIDDATA;

  979.     }

  980. 

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

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

  983.     if (!vc->channel_residues || !vc->saved)

  984.         return AVERROR(ENOMEM);

  985. 

  986.     vc->previous_window  = 0;

  987. 

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

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

  990. 

  991.     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 ",

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

  993. 

  994. /*

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

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

  997.         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)));

  998.     }

  999. */

  1000. 

  1001.     return 0;

  1002. }

  1003. 

  1004. // Process the extradata using the functions above (identification header, setup header)

  1005. 

  1006. static av_cold int vorbis_decode_init(AVCodecContext *avctx)

  1007. {

  1008.     vorbis_context *vc = avctx->priv_data;

  1009.     uint8_t *headers   = avctx->extradata;

  1010.     int headers_len    = avctx->extradata_size;

  1011.     uint8_t *header_start[3];

  1012.     int header_len[3];

  1013.     GetBitContext *gb = &vc->gb;

  1014.     int hdr_type, ret;

  1015. 

  1016.     vc->avctx = avctx;

  1017.     ff_vorbisdsp_init(&vc->dsp);

  1018.     avpriv_float_dsp_init(&vc->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);

  1019.     ff_fmt_convert_init(&vc->fmt_conv, avctx);

  1020. 

  1021.     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;

  1022. 

  1023.     if (!headers_len) {

  1024.         av_log(avctx, AV_LOG_ERROR, "Extradata missing.\n");

  1025.         return AVERROR_INVALIDDATA;

  1026.     }

  1027. 

  1028.     if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {

  1029.         av_log(avctx, AV_LOG_ERROR, "Extradata corrupt.\n");

  1030.         return ret;

  1031.     }

  1032. 

  1033.     init_get_bits(gb, header_start[0], header_len[0]*8);

  1034.     hdr_type = get_bits(gb, 8);

  1035.     if (hdr_type != 1) {

  1036.         av_log(avctx, AV_LOG_ERROR, "First header is not the id header.\n");

  1037.         return AVERROR_INVALIDDATA;

  1038.     }

  1039.     if ((ret = vorbis_parse_id_hdr(vc))) {

  1040.         av_log(avctx, AV_LOG_ERROR, "Id header corrupt.\n");

  1041.         vorbis_free(vc);

  1042.         return ret;

  1043.     }

  1044. 

  1045.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1046.     hdr_type = get_bits(gb, 8);

  1047.     if (hdr_type != 5) {

  1048.         av_log(avctx, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1049.         vorbis_free(vc);

  1050.         return AVERROR_INVALIDDATA;

  1051.     }

  1052.     if ((ret = vorbis_parse_setup_hdr(vc))) {

  1053.         av_log(avctx, AV_LOG_ERROR, "Setup header corrupt.\n");

  1054.         vorbis_free(vc);

  1055.         return ret;

  1056.     }

  1057. 

  1058.     if (vc->audio_channels > 8)

  1059.         avctx->channel_layout = 0;

  1060.     else

  1061.         avctx->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1062. 

  1063.     avctx->channels    = vc->audio_channels;

  1064.     avctx->sample_rate = vc->audio_samplerate;

  1065. 

  1066.     return 0;

  1067. }

  1068. 

  1069. // Decode audiopackets -------------------------------------------------

  1070. 

  1071. // Read and decode floor

  1072. 

  1073. static int vorbis_floor0_decode(vorbis_context *vc,

  1074.                                 vorbis_floor_data *vfu, float *vec)

  1075. {

  1076.     vorbis_floor0 *vf = &vfu->t0;

  1077.     float *lsp = vf->lsp;

  1078.     unsigned amplitude, book_idx;

  1079.     unsigned blockflag = vc->modes[vc->mode_number].blockflag;

  1080. 

  1081.     if (!vf->amplitude_bits)

  1082.         return 1;

  1083. 

  1084.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1085.     if (amplitude > 0) {

  1086.         float last = 0;

  1087.         unsigned idx, lsp_len = 0;

  1088.         vorbis_codebook codebook;

  1089. 

  1090.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1091.         if (book_idx >= vf->num_books) {

  1092.             av_log(vc->avctx, AV_LOG_ERROR, "floor0 dec: booknumber too high!\n");

  1093.             book_idx =  0;

  1094.         }

  1095.         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);

  1096.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1097.         /* Invalid codebook! */

  1098.         if (!codebook.codevectors)

  1099.             return AVERROR_INVALIDDATA;

  1100. 

  1101.         while (lsp_len<vf->order) {

  1102.             int vec_off;

  1103. 

  1104.             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);

  1105.             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1106.             /* read temp vector */

  1107.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1108.                                codebook.nb_bits, codebook.maxdepth)

  1109.                       * codebook.dimensions;

  1110.             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);

  1111.             /* copy each vector component and add last to it */

  1112.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1113.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1114.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1115. 

  1116.             lsp_len += codebook.dimensions;

  1117.         }

  1118.         /* DEBUG: output lsp coeffs */

  1119.         {

  1120.             int idx;

  1121.             for (idx = 0; idx < lsp_len; ++idx)

  1122.                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1123.         }

  1124. 

  1125.         /* synthesize floor output vector */

  1126.         {

  1127.             int i;

  1128.             int order = vf->order;

  1129.             float wstep = M_PI / vf->bark_map_size;

  1130. 

  1131.             for (i = 0; i < order; i++)

  1132.                 lsp[i] = 2.0f * cos(lsp[i]);

  1133. 

  1134.             av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",

  1135.                     vf->map_size[blockflag], order, wstep);

  1136. 

  1137.             i = 0;

  1138.             while (i < vf->map_size[blockflag]) {

  1139.                 int j, iter_cond = vf->map[blockflag][i];

  1140.                 float p = 0.5f;

  1141.                 float q = 0.5f;

  1142.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1143. 

  1144.                 /* similar part for the q and p products */

  1145.                 for (j = 0; j + 1 < order; j += 2) {

  1146.                     q *= lsp[j]     - two_cos_w;

  1147.                     p *= lsp[j + 1] - two_cos_w;

  1148.                 }

  1149.                 if (j == order) { // even order

  1150.                     p *= p * (2.0f - two_cos_w);

  1151.                     q *= q * (2.0f + two_cos_w);

  1152.                 } else { // odd order

  1153.                     q *= two_cos_w-lsp[j]; // one more time for q

  1154. 

  1155.                     /* final step and square */

  1156.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1157.                     q *= q;

  1158.                 }

  1159. 

  1160.                 /* calculate linear floor value */

  1161.                 q = exp((((amplitude*vf->amplitude_offset) /

  1162.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1163.                          - vf->amplitude_offset) * .11512925f);

  1164. 

  1165.                 /* fill vector */

  1166.                 do {

  1167.                     vec[i] = q; ++i;

  1168.                 } while (vf->map[blockflag][i] == iter_cond);

  1169.             }

  1170.         }

  1171.     } else {

  1172.         /* this channel is unused */

  1173.         return 1;

  1174.     }

  1175. 

  1176.     av_dlog(NULL, " Floor0 decoded\n");

  1177. 

  1178.     return 0;

  1179. }

  1180. 

  1181. static int vorbis_floor1_decode(vorbis_context *vc,

  1182.                                 vorbis_floor_data *vfu, float *vec)

  1183. {

  1184.     vorbis_floor1 *vf = &vfu->t1;

  1185.     GetBitContext *gb = &vc->gb;

  1186.     uint16_t range_v[4] = { 256, 128, 86, 64 };

  1187.     unsigned range = range_v[vf->multiplier - 1];

  1188.     uint16_t floor1_Y[258];

  1189.     uint16_t floor1_Y_final[258];

  1190.     int floor1_flag[258];

  1191.     unsigned class, cdim, cbits, csub, cval, offset, i, j;

  1192.     int book, adx, ady, dy, off, predicted, err;

  1193. 

  1194. 

  1195.     if (!get_bits1(gb)) // silence

  1196.         return 1;

  1197. 

  1198. // Read values (or differences) for the floor's points

  1199. 

  1200.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1201.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1202. 

  1203.     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1204. 

  1205.     offset = 2;

  1206.     for (i = 0; i < vf->partitions; ++i) {

  1207.         class = vf->partition_class[i];

  1208.         cdim   = vf->class_dimensions[class];

  1209.         cbits  = vf->class_subclasses[class];

  1210.         csub = (1 << cbits) - 1;

  1211.         cval = 0;

  1212. 

  1213.         av_dlog(NULL, "Cbits %u\n", cbits);

  1214. 

  1215.         if (cbits) // this reads all subclasses for this partition's class

  1216.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,

  1217.                             vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);

  1218. 

  1219.         for (j = 0; j < cdim; ++j) {

  1220.             book = vf->subclass_books[class][cval & csub];

  1221. 

  1222.             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",

  1223.                     book, cbits, cval, get_bits_count(gb));

  1224. 

  1225.             cval = cval >> cbits;

  1226.             if (book > -1) {

  1227.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1228.                 vc->codebooks[book].nb_bits, 3);

  1229.             } else {

  1230.                 floor1_Y[offset+j] = 0;

  1231.             }

  1232. 

  1233.             av_dlog(NULL, " floor(%d) = %d \n",

  1234.                     vf->list[offset+j].x, floor1_Y[offset+j]);

  1235.         }

  1236.         offset+=cdim;

  1237.     }

  1238. 

  1239. // Amplitude calculation from the differences

  1240. 

  1241.     floor1_flag[0] = 1;

  1242.     floor1_flag[1] = 1;

  1243.     floor1_Y_final[0] = floor1_Y[0];

  1244.     floor1_Y_final[1] = floor1_Y[1];

  1245. 

  1246.     for (i = 2; i < vf->x_list_dim; ++i) {

  1247.         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;

  1248. 

  1249.         low_neigh_offs  = vf->list[i].low;

  1250.         high_neigh_offs = vf->list[i].high;

  1251.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1252.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1253.         ady = FFABS(dy);

  1254.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1255.         off = err / adx;

  1256.         if (dy < 0) {

  1257.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1258.         } else {

  1259.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1260.         } // render_point end

  1261. 

  1262.         val = floor1_Y[i];

  1263.         highroom = range-predicted;

  1264.         lowroom  = predicted;

  1265.         if (highroom < lowroom) {

  1266.             room = highroom * 2;

  1267.         } else {

  1268.             room = lowroom * 2;   // SPEC misspelling

  1269.         }

  1270.         if (val) {

  1271.             floor1_flag[low_neigh_offs]  = 1;

  1272.             floor1_flag[high_neigh_offs] = 1;

  1273.             floor1_flag[i]               = 1;

  1274.             if (val >= room) {

  1275.                 if (highroom > lowroom) {

  1276.                     floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);

  1277.                 } else {

  1278.                     floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);

  1279.                 }

  1280.             } else {

  1281.                 if (val & 1) {

  1282.                     floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);

  1283.                 } else {

  1284.                     floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);

  1285.                 }

  1286.             }

  1287.         } else {

  1288.             floor1_flag[i]    = 0;

  1289.             floor1_Y_final[i] = av_clip_uint16(predicted);

  1290.         }

  1291. 

  1292.         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",

  1293.                 vf->list[i].x, floor1_Y_final[i], val);

  1294.     }

  1295. 

  1296. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1297. 

  1298.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1299. 

  1300.     av_dlog(NULL, " Floor decoded\n");

  1301. 

  1302.     return 0;

  1303. }

  1304. 

  1305. // Read and decode residue

  1306. 

  1307. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1308.                                                            vorbis_residue *vr,

  1309.                                                            unsigned ch,

  1310.                                                            uint8_t *do_not_decode,

  1311.                                                            float *vec,

  1312.                                                            unsigned vlen,

  1313.                                                            unsigned ch_left,

  1314.                                                            int vr_type)

  1315. {

  1316.     GetBitContext *gb = &vc->gb;

  1317.     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;

  1318.     unsigned ptns_to_read = vr->ptns_to_read;

  1319.     uint8_t *classifs = vr->classifs;

  1320.     unsigned pass, ch_used, i, j, k, l;

  1321.     unsigned max_output = (ch - 1) * vlen;

  1322. 

  1323.     if (vr_type == 2) {

  1324.         for (j = 1; j < ch; ++j)

  1325.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1326.         if (do_not_decode[0])

  1327.             return 0;

  1328.         ch_used = 1;

  1329.         max_output += vr->end / ch;

  1330.     } else {

  1331.         ch_used = ch;

  1332.         max_output += vr->end;

  1333.     }

  1334. 

  1335.     if (max_output > ch_left * vlen) {

  1336.         av_log(vc->avctx, AV_LOG_ERROR, "Insufficient output buffer\n");

  1337.         return -1;

  1338.     }

  1339. 

  1340.     av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1341. 

  1342.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1343.         uint16_t voffset, partition_count, j_times_ptns_to_read;

  1344. 

  1345.         voffset = vr->begin;

  1346.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1347.             if (!pass) {

  1348.                 unsigned inverse_class = ff_inverse[vr->classifications];

  1349.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1350.                     if (!do_not_decode[j]) {

  1351.                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1352.                                                  vc->codebooks[vr->classbook].nb_bits, 3);

  1353. 

  1354.                         av_dlog(NULL, "Classword: %u\n", temp);

  1355. 

  1356.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1357.                         for (i = 0; i < c_p_c; ++i) {

  1358.                             unsigned temp2;

  1359. 

  1360.                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;

  1361.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1362.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1363.                             temp = temp2;

  1364.                         }

  1365.                     }

  1366.                     j_times_ptns_to_read += ptns_to_read;

  1367.                 }

  1368.             }

  1369.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1370.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1371.                     unsigned voffs;

  1372. 

  1373.                     if (!do_not_decode[j]) {

  1374.                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];

  1375.                         int vqbook  = vr->books[vqclass][pass];

  1376. 

  1377.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1378.                             unsigned coffs;

  1379.                             unsigned dim  = vc->codebooks[vqbook].dimensions;

  1380.                             unsigned step = FASTDIV(vr->partition_size << 1, dim << 1);

  1381.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1382. 

  1383.                             if (vr_type == 0) {

  1384. 

  1385.                                 voffs = voffset+j*vlen;

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

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

  1388.                                     for (l = 0; l < dim; ++l)

  1389.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];

  1390.                                 }

  1391.                             } else if (vr_type == 1) {

  1392.                                 voffs = voffset + j * vlen;

  1393.                                 for (k = 0; k < step; ++k) {

  1394.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1395.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1396.                                         vec[voffs]+=codebook.codevectors[coffs+l];

  1397. 

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

  1399.                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1400.                                     }

  1401.                                 }

  1402.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1403.                                 voffs = voffset >> 1;

  1404. 

  1405.                                 if (dim == 2) {

  1406.                                     for (k = 0; k < step; ++k) {

  1407.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1408.                                         vec[voffs + k       ] += codebook.codevectors[coffs    ];

  1409.                                         vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];

  1410.                                     }

  1411.                                 } else if (dim == 4) {

  1412.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1413.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1414.                                         vec[voffs           ] += codebook.codevectors[coffs    ];

  1415.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];

  1416.                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];

  1417.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];

  1418.                                     }

  1419.                                 } else

  1420.                                 for (k = 0; k < step; ++k) {

  1421.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1422.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1423.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];

  1424.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];

  1425. 

  1426.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1427.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1428.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1429.                                                 codebook.codevectors[coffs + l], coffs, l);

  1430.                                     }

  1431.                                 }

  1432. 

  1433.                             } else if (vr_type == 2) {

  1434.                                 unsigned voffs_div = FASTDIV(voffset << 1, ch <<1);

  1435.                                 unsigned voffs_mod = voffset - voffs_div * ch;

  1436. 

  1437.                                 for (k = 0; k < step; ++k) {

  1438.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1439.                                     for (l = 0; l < dim; ++l) {

  1440.                                         vec[voffs_div + voffs_mod * vlen] +=

  1441.                                             codebook.codevectors[coffs + l];

  1442. 

  1443.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1444.                                                 pass, voffs_div + voffs_mod * vlen,

  1445.                                                 vec[voffs_div + voffs_mod * vlen],

  1446.                                                 codebook.codevectors[coffs + l], coffs, l);

  1447. 

  1448.                                         if (++voffs_mod == ch) {

  1449.                                             voffs_div++;

  1450.                                             voffs_mod = 0;

  1451.                                         }

  1452.                                     }

  1453.                                 }

  1454.                             }

  1455.                         }

  1456.                     }

  1457.                     j_times_ptns_to_read += ptns_to_read;

  1458.                 }

  1459.                 ++partition_count;

  1460.                 voffset += vr->partition_size;

  1461.             }

  1462.         }

  1463.     }

  1464.     return 0;

  1465. }

  1466. 

  1467. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1468.                                         unsigned ch,

  1469.                                         uint8_t *do_not_decode,

  1470.                                         float *vec, unsigned vlen,

  1471.                                         unsigned ch_left)

  1472. {

  1473.     if (vr->type == 2)

  1474.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);

  1475.     else if (vr->type == 1)

  1476.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);

  1477.     else if (vr->type == 0)

  1478.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);

  1479.     else {

  1480.         av_log(vc->avctx, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1481.         return AVERROR_INVALIDDATA;

  1482.     }

  1483. }

  1484. 

  1485. void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t blocksize)

  1486. {

  1487.     int i;

  1488.     for (i = 0;  i < blocksize;  i++) {

  1489.         if (mag[i] > 0.0) {

  1490.             if (ang[i] > 0.0) {

  1491.                 ang[i] = mag[i] - ang[i];

  1492.             } else {

  1493.                 float temp = ang[i];

  1494.                 ang[i]     = mag[i];

  1495.                 mag[i]    += temp;

  1496.             }

  1497.         } else {

  1498.             if (ang[i] > 0.0) {

  1499.                 ang[i] += mag[i];

  1500.             } else {

  1501.                 float temp = ang[i];

  1502.                 ang[i]     = mag[i];

  1503.                 mag[i]    -= temp;

  1504.             }

  1505.         }

  1506.     }

  1507. }

  1508. 

  1509. // Decode the audio packet using the functions above

  1510. 

  1511. static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr)

  1512. {

  1513.     GetBitContext *gb = &vc->gb;

  1514.     FFTContext *mdct;

  1515.     unsigned previous_window = vc->previous_window;

  1516.     unsigned mode_number, blockflag, blocksize;

  1517.     int i, j;

  1518.     uint8_t no_residue[255];

  1519.     uint8_t do_not_decode[255];

  1520.     vorbis_mapping *mapping;

  1521.     float *ch_res_ptr   = vc->channel_residues;

  1522.     uint8_t res_chan[255];

  1523.     unsigned res_num = 0;

  1524.     int retlen  = 0;

  1525.     unsigned ch_left = vc->audio_channels;

  1526.     unsigned vlen;

  1527. 

  1528.     if (get_bits1(gb)) {

  1529.         av_log(vc->avctx, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1530.         return AVERROR_INVALIDDATA; // packet type not audio

  1531.     }

  1532. 

  1533.     if (vc->mode_count == 1) {

  1534.         mode_number = 0;

  1535.     } else {

  1536.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1537.     }

  1538.     vc->mode_number = mode_number;

  1539.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1540. 

  1541.     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,

  1542.             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1543. 

  1544.     blockflag = vc->modes[mode_number].blockflag;

  1545.     blocksize = vc->blocksize[blockflag];

  1546.     vlen = blocksize / 2;

  1547.     if (blockflag) {

  1548.         previous_window = get_bits(gb, 1);

  1549.         skip_bits1(gb); // next_window

  1550.     }

  1551. 

  1552.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?

  1553.     for (i = 0; i < vc->audio_channels; ++i)

  1554.         memset(floor_ptr[i], 0, vlen * sizeof(floor_ptr[0][0])); //FIXME can this be removed ?

  1555. 

  1556. // Decode floor

  1557. 

  1558.     for (i = 0; i < vc->audio_channels; ++i) {

  1559.         vorbis_floor *floor;

  1560.         int ret;

  1561.         if (mapping->submaps > 1) {

  1562.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1563.         } else {

  1564.             floor = &vc->floors[mapping->submap_floor[0]];

  1565.         }

  1566. 

  1567.         ret = floor->decode(vc, &floor->data, floor_ptr[i]);

  1568. 

  1569.         if (ret < 0) {

  1570.             av_log(vc->avctx, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1571.             return AVERROR_INVALIDDATA;

  1572.         }

  1573.         no_residue[i] = ret;

  1574.     }

  1575. 

  1576. // Nonzero vector propagate

  1577. 

  1578.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1579.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1580.             no_residue[mapping->magnitude[i]] = 0;

  1581.             no_residue[mapping->angle[i]]     = 0;

  1582.         }

  1583.     }

  1584. 

  1585. // Decode residue

  1586. 

  1587.     for (i = 0; i < mapping->submaps; ++i) {

  1588.         vorbis_residue *residue;

  1589.         unsigned ch = 0;

  1590.         int ret;

  1591. 

  1592.         for (j = 0; j < vc->audio_channels; ++j) {

  1593.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1594.                 res_chan[j] = res_num;

  1595.                 if (no_residue[j]) {

  1596.                     do_not_decode[ch] = 1;

  1597.                 } else {

  1598.                     do_not_decode[ch] = 0;

  1599.                 }

  1600.                 ++ch;

  1601.                 ++res_num;

  1602.             }

  1603.         }

  1604.         residue = &vc->residues[mapping->submap_residue[i]];

  1605.         if (ch_left < ch) {

  1606.             av_log(vc->avctx, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");

  1607.             return -1;

  1608.         }

  1609.         if (ch) {

  1610.             ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);

  1611.             if (ret < 0)

  1612.                 return ret;

  1613.         }

  1614. 

  1615.         ch_res_ptr += ch * vlen;

  1616.         ch_left -= ch;

  1617.     }

  1618. 

  1619.     if (ch_left > 0)

  1620.         return AVERROR_INVALIDDATA;

  1621. 

  1622. // Inverse coupling

  1623. 

  1624.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1625.         float *mag, *ang;

  1626. 

  1627.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

  1628.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1629.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1630.     }

  1631. 

  1632. // Dotproduct, MDCT

  1633. 

  1634.     mdct = &vc->mdct[blockflag];

  1635. 

  1636.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1637.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1638.         vc->fdsp.vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);

  1639.         mdct->imdct_half(mdct, ch_res_ptr, floor_ptr[j]);

  1640.     }

  1641. 

  1642. // Overlap/add, save data for next overlapping

  1643. 

  1644.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

  1645.     for (j = 0; j < vc->audio_channels; j++) {

  1646.         unsigned bs0 = vc->blocksize[0];

  1647.         unsigned bs1 = vc->blocksize[1];

  1648.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1649.         float *saved      = vc->saved + j * bs1 / 4;

  1650.         float *ret        = floor_ptr[j];

  1651.         float *buf        = residue;

  1652.         const float *win  = vc->win[blockflag & previous_window];

  1653. 

  1654.         if (blockflag == previous_window) {

  1655.             vc->fdsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);

  1656.         } else if (blockflag > previous_window) {

  1657.             vc->fdsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);

  1658.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1659.         } else {

  1660.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1661.             vc->fdsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);

  1662.         }

  1663.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1664.     }

  1665. 

  1666.     vc->previous_window = blockflag;

  1667.     return retlen;

  1668. }

  1669. 

  1670. // Return the decoded audio packet through the standard api

  1671. 

  1672. static int vorbis_decode_frame(AVCodecContext *avctx, void *data,

  1673.                                int *got_frame_ptr, AVPacket *avpkt)

  1674. {

  1675.     const uint8_t *buf = avpkt->data;

  1676.     int buf_size       = avpkt->size;

  1677.     vorbis_context *vc = avctx->priv_data;

  1678.     AVFrame *frame     = data;

  1679.     GetBitContext *gb = &vc->gb;

  1680.     float *channel_ptrs[255];

  1681.     int i, len, ret;

  1682. 

  1683.     av_dlog(NULL, "packet length %d \n", buf_size);

  1684. 

  1685.     /* get output buffer */

  1686.     frame->nb_samples = vc->blocksize[1] / 2;

  1687.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {

  1688.         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  1689.         return ret;

  1690.     }

  1691. 

  1692.     if (vc->audio_channels > 8) {

  1693.         for (i = 0; i < vc->audio_channels; i++)

  1694.             channel_ptrs[i] = (float *)frame->extended_data[i];

  1695.     } else {

  1696.         for (i = 0; i < vc->audio_channels; i++) {

  1697.             int ch = ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1698.             channel_ptrs[ch] = (float *)frame->extended_data[i];

  1699.         }

  1700.     }

  1701. 

  1702.     init_get_bits(gb, buf, buf_size*8);

  1703. 

  1704.     if ((len = vorbis_parse_audio_packet(vc, channel_ptrs)) <= 0)

  1705.         return len;

  1706. 

  1707.     if (!vc->first_frame) {

  1708.         vc->first_frame = 1;

  1709.         *got_frame_ptr = 0;

  1710.         av_frame_unref(frame);

  1711.         return buf_size;

  1712.     }

  1713. 

  1714.     av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",

  1715.             get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);

  1716. 

  1717.     frame->nb_samples = len;

  1718.     *got_frame_ptr    = 1;

  1719. 

  1720.     return buf_size;

  1721. }

  1722. 

  1723. // Close decoder

  1724. 

  1725. static av_cold int vorbis_decode_close(AVCodecContext *avctx)

  1726. {

  1727.     vorbis_context *vc = avctx->priv_data;

  1728. 

  1729.     vorbis_free(vc);

  1730. 

  1731.     return 0;

  1732. }

  1733. 

  1734. static av_cold void vorbis_decode_flush(AVCodecContext *avctx)

  1735. {

  1736.     vorbis_context *vc = avctx->priv_data;

  1737. 

  1738.     if (vc->saved) {

  1739.         memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *

  1740.                              sizeof(*vc->saved));

  1741.     }

  1742.     vc->previous_window = 0;

  1743. }

  1744. 

  1745. AVCodec ff_vorbis_decoder = {

  1746.     .name            = "vorbis",

  1747.     .type            = AVMEDIA_TYPE_AUDIO,

  1748.     .id              = AV_CODEC_ID_VORBIS,

  1749.     .priv_data_size  = sizeof(vorbis_context),

  1750.     .init            = vorbis_decode_init,

  1751.     .close           = vorbis_decode_close,

  1752.     .decode          = vorbis_decode_frame,

  1753.     .flush           = vorbis_decode_flush,

  1754.     .capabilities    = CODEC_CAP_DR1,

  1755.     .long_name       = NULL_IF_CONFIG_SMALL("Vorbis"),

  1756.     .channel_layouts = ff_vorbis_channel_layouts,

  1757.     .sample_fmts     = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  1758.                                                        AV_SAMPLE_FMT_NONE },

  1759. };