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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. /**

  24.  * @file

  25.  * Vorbis I decoder

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

  27.  */

  28. 

  29. #include <inttypes.h>

  30. #include <math.h>

  31. 

  32. #define BITSTREAM_READER_LE

  33. #include "libavutil/float_dsp.h"

  34. #include "avcodec.h"

  35. #include "get_bits.h"

  36. #include "dsputil.h"

  37. #include "fft.h"

  38. #include "fmtconvert.h"

  39. 

  40. #include "vorbis.h"

  41. #include "xiph.h"

  42. 

  43. #define V_NB_BITS 8

  44. #define V_NB_BITS2 11

  45. #define V_MAX_VLCS (1 << 16)

  46. #define V_MAX_PARTITIONS (1 << 20)

  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.     AVFrame frame;

  130.     GetBitContext gb;

  131.     DSPContext dsp;

  132.     AVFloatDSPContext fdsp;

  133.     FmtConvertContext fmt_conv;

  134. 

  135.     FFTContext mdct[2];

  136.     uint8_t       first_frame;

  137.     uint32_t      version;

  138.     uint8_t       audio_channels;

  139.     uint32_t      audio_samplerate;

  140.     uint32_t      bitrate_maximum;

  141.     uint32_t      bitrate_nominal;

  142.     uint32_t      bitrate_minimum;

  143.     uint32_t      blocksize[2];

  144.     const float  *win[2];

  145.     uint16_t      codebook_count;

  146.     vorbis_codebook *codebooks;

  147.     uint8_t       floor_count;

  148.     vorbis_floor *floors;

  149.     uint8_t       residue_count;

  150.     vorbis_residue *residues;

  151.     uint8_t       mapping_count;

  152.     vorbis_mapping *mappings;

  153.     uint8_t       mode_count;

  154.     vorbis_mode  *modes;

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

  156.     uint8_t       previous_window;

  157.     float        *channel_residues;

  158.     float        *channel_floors;

  159.     float        *saved;

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

  161. } vorbis_context;

  162. 

  163. /* Helper functions */

  164. 

  165. #define BARK(x) \

  166.     (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))

  167. 

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

  169. #define VALIDATE_INDEX(idx, limit) \

  170.     if (idx >= limit) {\

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

  172.                idx_err_str,\

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

  174.         return AVERROR_INVALIDDATA;\

  175.     }

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

  177.     {\

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

  179.         VALIDATE_INDEX(idx, limit)\

  180.     }

  181. 

  182. static float vorbisfloat2float(unsigned val)

  183. {

  184.     double mant = val & 0x1fffff;

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

  186.     if (val & 0x80000000)

  187.         mant = -mant;

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

  189. }

  190. 

  191. 

  192. // Free all allocated memory -----------------------------------------

  193. 

  194. static void vorbis_free(vorbis_context *vc)

  195. {

  196.     int i;

  197. 

  198.     av_freep(&vc->channel_residues);

  199.     av_freep(&vc->channel_floors);

  200.     av_freep(&vc->saved);

  201. 

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

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

  204.     av_freep(&vc->residues);

  205.     av_freep(&vc->modes);

  206. 

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

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

  209. 

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

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

  212.         ff_free_vlc(&vc->codebooks[i].vlc);

  213.     }

  214.     av_freep(&vc->codebooks);

  215. 

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

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

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

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

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

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

  222.         } else {

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

  224.         }

  225.     }

  226.     av_freep(&vc->floors);

  227. 

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

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

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

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

  232.     }

  233.     av_freep(&vc->mappings);

  234. }

  235. 

  236. // Parse setup header -------------------------------------------------

  237. 

  238. // Process codebooks part

  239. 

  240. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  241. {

  242.     unsigned cb;

  243.     uint8_t  *tmp_vlc_bits;

  244.     uint32_t *tmp_vlc_codes;

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

  246.     uint16_t *codebook_multiplicands;

  247.     int ret = 0;

  248. 

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

  250. 

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

  252. 

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

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

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

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

  257. 

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

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

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

  261. 

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

  263. 

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

  265.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  267.             ret = AVERROR_INVALIDDATA;

  268.             goto error;

  269.         }

  270. 

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

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

  273.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  275.                    cb, codebook_setup->dimensions);

  276.             ret = AVERROR_INVALIDDATA;

  277.             goto error;

  278.         }

  279.         entries = get_bits(gb, 24);

  280.         if (entries > V_MAX_VLCS) {

  281.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  283.                    cb, entries);

  284.             ret = AVERROR_INVALIDDATA;

  285.             goto error;

  286.         }

  287. 

  288.         ordered = get_bits1(gb);

  289. 

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

  291.                 codebook_setup->dimensions, entries);

  292. 

  293.         if (!ordered) {

  294.             unsigned ce, flag;

  295.             unsigned sparse = get_bits1(gb);

  296. 

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

  298. 

  299.             if (sparse) {

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

  301. 

  302.                 used_entries = 0;

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

  304.                     flag = get_bits1(gb);

  305.                     if (flag) {

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

  307.                         ++used_entries;

  308.                     } else

  309.                         tmp_vlc_bits[ce] = 0;

  310.                 }

  311.             } else {

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

  313. 

  314.                 used_entries = entries;

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

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

  317.             }

  318.         } else {

  319.             unsigned current_entry  = 0;

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

  321. 

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

  323. 

  324.             used_entries = entries;

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

  326.                 unsigned i, number;

  327. 

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

  329. 

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

  331. 

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

  333. 

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

  335.                     if (i < used_entries)

  336.                         tmp_vlc_bits[i] = current_length;

  337. 

  338.                 current_entry+=number;

  339.             }

  340.             if (current_entry>used_entries) {

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

  342.                 ret = AVERROR_INVALIDDATA;

  343.                 goto error;

  344.             }

  345.         }

  346. 

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

  348. 

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

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

  351. 

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

  353. 

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

  355.             unsigned i, j, k;

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

  357. 

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

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

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

  361.             unsigned codebook_sequence_p = get_bits1(gb);

  362. 

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

  364.                     codebook_lookup_values);

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

  366.                     codebook_delta_value, codebook_minimum_value);

  367. 

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

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

  370. 

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

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

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

  374.             }

  375. 

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

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

  378.                                                                     codebook_setup->dimensions *

  379.                                                                     sizeof(*codebook_setup->codevectors))

  380.                                                        : NULL;

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

  382.                 unsigned dim = codebook_setup->dimensions;

  383. 

  384.                 if (tmp_vlc_bits[i]) {

  385.                     float last = 0.0;

  386.                     unsigned lookup_offset = i;

  387. 

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

  389. 

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

  391.                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  393.                         if (codebook_sequence_p)

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

  395.                         lookup_offset/=codebook_lookup_values;

  396.                     }

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

  398. 

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

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

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

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

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

  404. 

  405.                     ++j;

  406.                 }

  407.             }

  408.             if (j != used_entries) {

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

  410.                 ret = AVERROR_INVALIDDATA;

  411.                 goto error;

  412.             }

  413.             entries = used_entries;

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

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

  416.             ret = AVERROR_INVALIDDATA;

  417.             goto error;

  418.         }

  419. 

  420. // Initialize VLC table

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

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

  423.             ret = AVERROR_INVALIDDATA;

  424.             goto error;

  425.         }

  426.         codebook_setup->maxdepth = 0;

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

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

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

  430. 

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

  432.             codebook_setup->nb_bits = V_NB_BITS2;

  433.         else

  434.             codebook_setup->nb_bits = V_NB_BITS;

  435. 

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

  437. 

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

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

  440.                             sizeof(*tmp_vlc_bits), tmp_vlc_codes,

  441.                             sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),

  442.                             INIT_VLC_LE))) {

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

  444.             goto error;

  445.         }

  446.     }

  447. 

  448.     av_free(tmp_vlc_bits);

  449.     av_free(tmp_vlc_codes);

  450.     av_free(codebook_multiplicands);

  451.     return 0;

  452. 

  453. // Error:

  454. error:

  455.     av_free(tmp_vlc_bits);

  456.     av_free(tmp_vlc_codes);

  457.     av_free(codebook_multiplicands);

  458.     return ret;

  459. }

  460. 

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

  462. 

  463. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  464. {

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

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

  467. 

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

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

  470. 

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

  472.                 vorbis_time_count, vorbis_tdtransform);

  473. 

  474.         if (vorbis_tdtransform) {

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

  476.             return AVERROR_INVALIDDATA;

  477.         }

  478.     }

  479.     return 0;

  480. }

  481. 

  482. // Process floors part

  483. 

  484. static int vorbis_floor0_decode(vorbis_context *vc,

  485.                                 vorbis_floor_data *vfu, float *vec);

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

  487. static int vorbis_floor1_decode(vorbis_context *vc,

  488.                                 vorbis_floor_data *vfu, float *vec);

  489. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  490. {

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

  492.     int i,j,k;

  493. 

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

  495. 

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

  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. 

  561. 

  562.             rangebits = get_bits(gb, 4);

  563.             rangemax = (1 << rangebits);

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

  565.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

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

  568.                 return AVERROR_INVALIDDATA;

  569.             }

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

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

  572. 

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

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

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

  576. 

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

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

  579.                 }

  580.             }

  581. 

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

  583.             if (ff_vorbis_ready_floor1_list(vc->avccontext,

  584.                                             floor_setup->data.t1.list,

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

  586.                 return AVERROR_INVALIDDATA;

  587.             }

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

  589.             unsigned max_codebook_dim = 0;

  590. 

  591.             floor_setup->decode = vorbis_floor0_decode;

  592. 

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

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

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

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

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

  598.              * 2^0 - 1 == 0                             */

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

  600.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

  602.                 return AVERROR_INVALIDDATA;

  603.             }

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

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

  606. 

  607.             /* allocate mem for booklist */

  608.             floor_setup->data.t0.book_list =

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

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

  611.                 return AVERROR(ENOMEM);

  612.             /* read book indexes */

  613.             {

  614.                 int idx;

  615.                 unsigned book_idx;

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

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

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

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

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

  621.                 }

  622.             }

  623. 

  624.             create_map(vc, i);

  625. 

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

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

  628.             floor_setup->data.t0.lsp =

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

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

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

  632.                 return AVERROR(ENOMEM);

  633. 

  634.             /* debug output parsed headers */

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

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

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

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

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

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

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

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

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

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

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

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

  647.             {

  648.                 int idx;

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

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

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

  652.                 }

  653.             }

  654.         } else {

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

  656.             return AVERROR_INVALIDDATA;

  657.         }

  658.     }

  659.     return 0;

  660. }

  661. 

  662. // Process residues part

  663. 

  664. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  665. {

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

  667.     unsigned i, j, k;

  668. 

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

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

  671. 

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

  673. 

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

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

  676.         uint8_t cascade[64];

  677.         unsigned high_bits, low_bits;

  678. 

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

  680. 

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

  682. 

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

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

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

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

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

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

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

  690.             av_log(vc->avccontext, AV_LOG_ERROR,

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

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

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

  694.             return AVERROR_INVALIDDATA;

  695.         }

  696. 

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

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

  699. 

  700.         res_setup->ptns_to_read =

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

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

  703.                                         vc->audio_channels *

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

  705.         if (!res_setup->classifs)

  706.             return AVERROR(ENOMEM);

  707. 

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

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

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

  711. 

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

  713.             high_bits = 0;

  714.             low_bits  = get_bits(gb, 3);

  715.             if (get_bits1(gb))

  716.                 high_bits = get_bits(gb, 5);

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

  718. 

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

  720.         }

  721. 

  722.         res_setup->maxpass = 0;

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

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

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

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

  727. 

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

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

  730. 

  731.                     if (k>res_setup->maxpass)

  732.                         res_setup->maxpass = k;

  733.                 } else {

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

  735.                 }

  736.             }

  737.         }

  738.     }

  739.     return 0;

  740. }

  741. 

  742. // Process mappings part

  743. 

  744. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  745. {

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

  747.     unsigned i, j;

  748. 

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

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

  751. 

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

  753. 

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

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

  756. 

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

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

  759.             return AVERROR_INVALIDDATA;

  760.         }

  761.         if (get_bits1(gb)) {

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

  763.         } else {

  764.             mapping_setup->submaps = 1;

  765.         }

  766. 

  767.         if (get_bits1(gb)) {

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

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

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

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

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

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

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

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

  776.             }

  777.         } else {

  778.             mapping_setup->coupling_steps = 0;

  779.         }

  780. 

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

  782.                 i, mapping_setup->coupling_steps);

  783. 

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

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

  786.             return AVERROR_INVALIDDATA; // following spec.

  787.         }

  788. 

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

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

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

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

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

  794.         }

  795. 

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

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

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

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

  800. 

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

  802.                     mapping_setup->submap_floor[j],

  803.                     mapping_setup->submap_residue[j]);

  804.         }

  805.     }

  806.     return 0;

  807. }

  808. 

  809. // Process modes part

  810. 

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

  812. {

  813.     vorbis_floor *floors = vc->floors;

  814.     vorbis_floor0 *vf;

  815.     int idx;

  816.     int blockflag, n;

  817.     int32_t *map;

  818. 

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

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

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

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

  823. 

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

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

  826. 

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

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

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

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

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

  832.         }

  833.         map[n] = -1;

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

  835.     }

  836. 

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

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

  839.     }

  840. }

  841. 

  842. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  843. {

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

  845.     unsigned i;

  846. 

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

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

  849. 

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

  851. 

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

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

  854. 

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

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

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

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

  859. 

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

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

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

  863.     }

  864.     return 0;

  865. }

  866. 

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

  868. 

  869. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  870. {

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

  872.     int ret;

  873. 

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

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

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

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

  878.         return AVERROR_INVALIDDATA;

  879.     }

  880. 

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

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

  883.         return ret;

  884.     }

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

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

  887.         return ret;

  888.     }

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

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

  891.         return ret;

  892.     }

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

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

  895.         return ret;

  896.     }

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

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

  899.         return ret;

  900.     }

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

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

  903.         return ret;

  904.     }

  905.     if (!get_bits1(gb)) {

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

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

  908.     }

  909. 

  910.     return 0;

  911. }

  912. 

  913. // Process the identification header

  914. 

  915. static int vorbis_parse_id_hdr(vorbis_context *vc)

  916. {

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

  918.     unsigned bl0, bl1;

  919. 

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

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

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

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

  924.         return AVERROR_INVALIDDATA;

  925.     }

  926. 

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

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

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

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

  931.         return AVERROR_INVALIDDATA;

  932.     }

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

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

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

  936.         return AVERROR_INVALIDDATA;

  937.     }

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

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

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

  941.     bl0 = get_bits(gb, 4);

  942.     bl1 = get_bits(gb, 4);

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

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

  945.         return AVERROR_INVALIDDATA;

  946.     }

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

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

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

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

  951. 

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

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

  954.         return AVERROR_INVALIDDATA;

  955.     }

  956. 

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

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

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

  960.     vc->previous_window  = 0;

  961. 

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

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

  964. 

  965.     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 ",

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

  967. 

  968. /*

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

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

  971.         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)));

  972.     }

  973. */

  974. 

  975.     return 0;

  976. }

  977. 

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

  979. 

  980. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  981. {

  982.     vorbis_context *vc = avccontext->priv_data;

  983.     uint8_t *headers   = avccontext->extradata;

  984.     int headers_len    = avccontext->extradata_size;

  985.     uint8_t *header_start[3];

  986.     int header_len[3];

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

  988.     int hdr_type, ret;

  989. 

  990.     vc->avccontext = avccontext;

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

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

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

  994. 

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

  996.         avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;

  997.         vc->scale_bias = 1.0f;

  998.     } else {

  999.         avccontext->sample_fmt = AV_SAMPLE_FMT_S16;

  1000.         vc->scale_bias = 32768.0f;

  1001.     }

  1002. 

  1003.     if (!headers_len) {

  1004.         av_log(avccontext, AV_LOG_ERROR, "Extradata missing.\n");

  1005.         return AVERROR_INVALIDDATA;

  1006.     }

  1007. 

  1008.     if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {

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

  1010.         return ret;

  1011.     }

  1012. 

  1013.     init_get_bits(gb, header_start[0], header_len[0]*8);

  1014.     hdr_type = get_bits(gb, 8);

  1015.     if (hdr_type != 1) {

  1016.         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");

  1017.         return AVERROR_INVALIDDATA;

  1018.     }

  1019.     if ((ret = vorbis_parse_id_hdr(vc))) {

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

  1021.         vorbis_free(vc);

  1022.         return ret;

  1023.     }

  1024. 

  1025.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1026.     hdr_type = get_bits(gb, 8);

  1027.     if (hdr_type != 5) {

  1028.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1029.         vorbis_free(vc);

  1030.         return AVERROR_INVALIDDATA;

  1031.     }

  1032.     if ((ret = vorbis_parse_setup_hdr(vc))) {

  1033.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1034.         vorbis_free(vc);

  1035.         return ret;

  1036.     }

  1037. 

  1038.     if (vc->audio_channels > 8)

  1039.         avccontext->channel_layout = 0;

  1040.     else

  1041.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1042. 

  1043.     avccontext->channels    = vc->audio_channels;

  1044.     avccontext->sample_rate = vc->audio_samplerate;

  1045. 

  1046.     avcodec_get_frame_defaults(&vc->frame);

  1047.     avccontext->coded_frame = &vc->frame;

  1048. 

  1049.     return 0;

  1050. }

  1051. 

  1052. // Decode audiopackets -------------------------------------------------

  1053. 

  1054. // Read and decode floor

  1055. 

  1056. static int vorbis_floor0_decode(vorbis_context *vc,

  1057.                                 vorbis_floor_data *vfu, float *vec)

  1058. {

  1059.     vorbis_floor0 *vf = &vfu->t0;

  1060.     float *lsp = vf->lsp;

  1061.     unsigned amplitude, book_idx;

  1062.     unsigned blockflag = vc->modes[vc->mode_number].blockflag;

  1063. 

  1064.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1065.     if (amplitude > 0) {

  1066.         float last = 0;

  1067.         unsigned idx, lsp_len = 0;

  1068.         vorbis_codebook codebook;

  1069. 

  1070.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1071.         if (book_idx >= vf->num_books) {

  1072.             av_log(vc->avccontext, AV_LOG_ERROR,

  1073.                     "floor0 dec: booknumber too high!\n");

  1074.             book_idx =  0;

  1075.         }

  1076.         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);

  1077.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1078.         /* Invalid codebook! */

  1079.         if (!codebook.codevectors)

  1080.             return AVERROR_INVALIDDATA;

  1081. 

  1082.         while (lsp_len<vf->order) {

  1083.             int vec_off;

  1084. 

  1085.             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);

  1086.             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1087.             /* read temp vector */

  1088.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1089.                                codebook.nb_bits, codebook.maxdepth)

  1090.                       * codebook.dimensions;

  1091.             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);

  1092.             /* copy each vector component and add last to it */

  1093.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1094.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1095.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1096. 

  1097.             lsp_len += codebook.dimensions;

  1098.         }

  1099.         /* DEBUG: output lsp coeffs */

  1100.         {

  1101.             int idx;

  1102.             for (idx = 0; idx < lsp_len; ++idx)

  1103.                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1104.         }

  1105. 

  1106.         /* synthesize floor output vector */

  1107.         {

  1108.             int i;

  1109.             int order = vf->order;

  1110.             float wstep = M_PI / vf->bark_map_size;

  1111. 

  1112.             for (i = 0; i < order; i++)

  1113.                 lsp[i] = 2.0f * cos(lsp[i]);

  1114. 

  1115.             av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",

  1116.                     vf->map_size[blockflag], order, wstep);

  1117. 

  1118.             i = 0;

  1119.             while (i < vf->map_size[blockflag]) {

  1120.                 int j, iter_cond = vf->map[blockflag][i];

  1121.                 float p = 0.5f;

  1122.                 float q = 0.5f;

  1123.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1124. 

  1125.                 /* similar part for the q and p products */

  1126.                 for (j = 0; j + 1 < order; j += 2) {

  1127.                     q *= lsp[j]     - two_cos_w;

  1128.                     p *= lsp[j + 1] - two_cos_w;

  1129.                 }

  1130.                 if (j == order) { // even order

  1131.                     p *= p * (2.0f - two_cos_w);

  1132.                     q *= q * (2.0f + two_cos_w);

  1133.                 } else { // odd order

  1134.                     q *= two_cos_w-lsp[j]; // one more time for q

  1135. 

  1136.                     /* final step and square */

  1137.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1138.                     q *= q;

  1139.                 }

  1140. 

  1141.                 /* calculate linear floor value */

  1142.                 q = exp((((amplitude*vf->amplitude_offset) /

  1143.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1144.                          - vf->amplitude_offset) * .11512925f);

  1145. 

  1146.                 /* fill vector */

  1147.                 do {

  1148.                     vec[i] = q; ++i;

  1149.                 } while (vf->map[blockflag][i] == iter_cond);

  1150.             }

  1151.         }

  1152.     } else {

  1153.         /* this channel is unused */

  1154.         return 1;

  1155.     }

  1156. 

  1157.     av_dlog(NULL, " Floor0 decoded\n");

  1158. 

  1159.     return 0;

  1160. }

  1161. 

  1162. static int vorbis_floor1_decode(vorbis_context *vc,

  1163.                                 vorbis_floor_data *vfu, float *vec)

  1164. {

  1165.     vorbis_floor1 *vf = &vfu->t1;

  1166.     GetBitContext *gb = &vc->gb;

  1167.     uint16_t range_v[4] = { 256, 128, 86, 64 };

  1168.     unsigned range = range_v[vf->multiplier - 1];

  1169.     uint16_t floor1_Y[258];

  1170.     uint16_t floor1_Y_final[258];

  1171.     int floor1_flag[258];

  1172.     unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;

  1173.     int book, adx, ady, dy, off, predicted, err;

  1174. 

  1175. 

  1176.     if (!get_bits1(gb)) // silence

  1177.         return 1;

  1178. 

  1179. // Read values (or differences) for the floor's points

  1180. 

  1181.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1182.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1183. 

  1184.     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1185. 

  1186.     offset = 2;

  1187.     for (i = 0; i < vf->partitions; ++i) {

  1188.         partition_class = vf->partition_class[i];

  1189.         cdim   = vf->class_dimensions[partition_class];

  1190.         cbits  = vf->class_subclasses[partition_class];

  1191.         csub = (1 << cbits) - 1;

  1192.         cval = 0;

  1193. 

  1194.         av_dlog(NULL, "Cbits %u\n", cbits);

  1195. 

  1196.         if (cbits) // this reads all subclasses for this partition's class

  1197.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,

  1198.                             vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);

  1199. 

  1200.         for (j = 0; j < cdim; ++j) {

  1201.             book = vf->subclass_books[partition_class][cval & csub];

  1202. 

  1203.             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",

  1204.                     book, cbits, cval, get_bits_count(gb));

  1205. 

  1206.             cval = cval >> cbits;

  1207.             if (book > -1) {

  1208.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1209.                 vc->codebooks[book].nb_bits, 3);

  1210.             } else {

  1211.                 floor1_Y[offset+j] = 0;

  1212.             }

  1213. 

  1214.             av_dlog(NULL, " floor(%d) = %d \n",

  1215.                     vf->list[offset+j].x, floor1_Y[offset+j]);

  1216.         }

  1217.         offset+=cdim;

  1218.     }

  1219. 

  1220. // Amplitude calculation from the differences

  1221. 

  1222.     floor1_flag[0] = 1;

  1223.     floor1_flag[1] = 1;

  1224.     floor1_Y_final[0] = floor1_Y[0];

  1225.     floor1_Y_final[1] = floor1_Y[1];

  1226. 

  1227.     for (i = 2; i < vf->x_list_dim; ++i) {

  1228.         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;

  1229. 

  1230.         low_neigh_offs  = vf->list[i].low;

  1231.         high_neigh_offs = vf->list[i].high;

  1232.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1233.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1234.         ady = FFABS(dy);

  1235.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1236.         off = err / adx;

  1237.         if (dy < 0) {

  1238.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1239.         } else {

  1240.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1241.         } // render_point end

  1242. 

  1243.         val = floor1_Y[i];

  1244.         highroom = range-predicted;

  1245.         lowroom  = predicted;

  1246.         if (highroom < lowroom) {

  1247.             room = highroom * 2;

  1248.         } else {

  1249.             room = lowroom * 2;   // SPEC mispelling

  1250.         }

  1251.         if (val) {

  1252.             floor1_flag[low_neigh_offs]  = 1;

  1253.             floor1_flag[high_neigh_offs] = 1;

  1254.             floor1_flag[i]               = 1;

  1255.             if (val >= room) {

  1256.                 if (highroom > lowroom) {

  1257.                     floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);

  1258.                 } else {

  1259.                     floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);

  1260.                 }

  1261.             } else {

  1262.                 if (val & 1) {

  1263.                     floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);

  1264.                 } else {

  1265.                     floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);

  1266.                 }

  1267.             }

  1268.         } else {

  1269.             floor1_flag[i]    = 0;

  1270.             floor1_Y_final[i] = av_clip_uint16(predicted);

  1271.         }

  1272. 

  1273.         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",

  1274.                 vf->list[i].x, floor1_Y_final[i], val);

  1275.     }

  1276. 

  1277. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1278. 

  1279.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1280. 

  1281.     av_dlog(NULL, " Floor decoded\n");

  1282. 

  1283.     return 0;

  1284. }

  1285. 

  1286. // Read and decode residue

  1287. 

  1288. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1289.                                                            vorbis_residue *vr,

  1290.                                                            unsigned ch,

  1291.                                                            uint8_t *do_not_decode,

  1292.                                                            float *vec,

  1293.                                                            unsigned vlen,

  1294.                                                            unsigned ch_left,

  1295.                                                            int vr_type)

  1296. {

  1297.     GetBitContext *gb = &vc->gb;

  1298.     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;

  1299.     unsigned ptns_to_read = vr->ptns_to_read;

  1300.     uint8_t *classifs = vr->classifs;

  1301.     unsigned pass, ch_used, i, j, k, l;

  1302.     unsigned max_output = (ch - 1) * vlen;

  1303. 

  1304.     if (vr_type == 2) {

  1305.         for (j = 1; j < ch; ++j)

  1306.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1307.         if (do_not_decode[0])

  1308.             return 0;

  1309.         ch_used = 1;

  1310.         max_output += vr->end / ch;

  1311.     } else {

  1312.         ch_used = ch;

  1313.         max_output += vr->end;

  1314.     }

  1315. 

  1316.     if (max_output > ch_left * vlen) {

  1317.         av_log(vc->avccontext, AV_LOG_ERROR, "Insufficient output buffer\n");

  1318.         return -1;

  1319.     }

  1320. 

  1321.     av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1322. 

  1323.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1324.         uint16_t voffset, partition_count, j_times_ptns_to_read;

  1325. 

  1326.         voffset = vr->begin;

  1327.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1328.             if (!pass) {

  1329.                 unsigned inverse_class = ff_inverse[vr->classifications];

  1330.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1331.                     if (!do_not_decode[j]) {

  1332.                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1333.                                                  vc->codebooks[vr->classbook].nb_bits, 3);

  1334. 

  1335.                         av_dlog(NULL, "Classword: %u\n", temp);

  1336. 

  1337.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1338.                         for (i = 0; i < c_p_c; ++i) {

  1339.                             unsigned temp2;

  1340. 

  1341.                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;

  1342.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1343.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1344.                             temp = temp2;

  1345.                         }

  1346.                     }

  1347.                     j_times_ptns_to_read += ptns_to_read;

  1348.                 }

  1349.             }

  1350.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1351.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1352.                     unsigned voffs;

  1353. 

  1354.                     if (!do_not_decode[j]) {

  1355.                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];

  1356.                         int vqbook  = vr->books[vqclass][pass];

  1357. 

  1358.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1359.                             unsigned coffs;

  1360.                             unsigned dim  = vc->codebooks[vqbook].dimensions;

  1361.                             unsigned step = dim == 1 ? vr->partition_size

  1362.                                                      : FASTDIV(vr->partition_size, dim);

  1363.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1364. 

  1365.                             if (vr_type == 0) {

  1366. 

  1367.                                 voffs = voffset+j*vlen;

  1368.                                 for (k = 0; k < step; ++k) {

  1369.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1370.                                     for (l = 0; l < dim; ++l)

  1371.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH

  1372.                                 }

  1373.                             } else if (vr_type == 1) {

  1374.                                 voffs = voffset + j * vlen;

  1375.                                 for (k = 0; k < step; ++k) {

  1376.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1377.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1378.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1379. 

  1380.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d  \n",

  1381.                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1382.                                     }

  1383.                                 }

  1384.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1385.                                 voffs = voffset >> 1;

  1386. 

  1387.                                 if (dim == 2) {

  1388.                                     for (k = 0; k < step; ++k) {

  1389.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1390.                                         vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH

  1391.                                         vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH

  1392.                                     }

  1393.                                 } else if (dim == 4) {

  1394.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1395.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

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

  1397.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH

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

  1399.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH

  1400.                                     }

  1401.                                 } else

  1402.                                 for (k = 0; k < step; ++k) {

  1403.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1404.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1405.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH

  1406.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH

  1407. 

  1408.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1409.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1410.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1411.                                                 codebook.codevectors[coffs + l], coffs, l);

  1412.                                     }

  1413.                                 }

  1414. 

  1415.                             } else if (vr_type == 2) {

  1416.                                 unsigned voffs_div = FASTDIV(voffset, ch);

  1417.                                 unsigned voffs_mod = voffset - voffs_div * ch;

  1418. 

  1419.                                 for (k = 0; k < step; ++k) {

  1420.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1421.                                     for (l = 0; l < dim; ++l) {

  1422.                                         vec[voffs_div + voffs_mod * vlen] +=

  1423.                                             codebook.codevectors[coffs + l];

  1424. 

  1425.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1426.                                                 pass, voffs_div + voffs_mod * vlen,

  1427.                                                 vec[voffs_div + voffs_mod * vlen],

  1428.                                                 codebook.codevectors[coffs + l], coffs, l);

  1429. 

  1430.                                         if (++voffs_mod == ch) {

  1431.                                             voffs_div++;

  1432.                                             voffs_mod = 0;

  1433.                                         }

  1434.                                     }

  1435.                                 }

  1436.                             }

  1437.                         }

  1438.                     }

  1439.                     j_times_ptns_to_read += ptns_to_read;

  1440.                 }

  1441.                 ++partition_count;

  1442.                 voffset += vr->partition_size;

  1443.             }

  1444.         }

  1445.     }

  1446.     return 0;

  1447. }

  1448. 

  1449. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1450.                                         unsigned ch,

  1451.                                         uint8_t *do_not_decode,

  1452.                                         float *vec, unsigned vlen,

  1453.                                         unsigned ch_left)

  1454. {

  1455.     if (vr->type == 2)

  1456.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);

  1457.     else if (vr->type == 1)

  1458.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);

  1459.     else if (vr->type == 0)

  1460.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);

  1461.     else {

  1462.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1463.         return AVERROR_INVALIDDATA;

  1464.     }

  1465. }

  1466. 

  1467. void ff_vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1468. {

  1469.     int i;

  1470.     for (i = 0;  i < blocksize;  i++) {

  1471.         if (mag[i] > 0.0) {

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

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

  1474.             } else {

  1475.                 float temp = ang[i];

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

  1477.                 mag[i]    += temp;

  1478.             }

  1479.         } else {

  1480.             if (ang[i] > 0.0) {

  1481.                 ang[i] += mag[i];

  1482.             } else {

  1483.                 float temp = ang[i];

  1484.                 ang[i]     = mag[i];

  1485.                 mag[i]    -= temp;

  1486.             }

  1487.         }

  1488.     }

  1489. }

  1490. 

  1491. // Decode the audio packet using the functions above

  1492. 

  1493. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1494. {

  1495.     GetBitContext *gb = &vc->gb;

  1496.     FFTContext *mdct;

  1497.     unsigned previous_window = vc->previous_window;

  1498.     unsigned mode_number, blockflag, blocksize;

  1499.     int i, j;

  1500.     uint8_t no_residue[255];

  1501.     uint8_t do_not_decode[255];

  1502.     vorbis_mapping *mapping;

  1503.     float *ch_res_ptr   = vc->channel_residues;

  1504.     float *ch_floor_ptr = vc->channel_floors;

  1505.     uint8_t res_chan[255];

  1506.     unsigned res_num = 0;

  1507.     int retlen  = 0;

  1508.     unsigned ch_left = vc->audio_channels;

  1509.     unsigned vlen;

  1510. 

  1511.     if (get_bits1(gb)) {

  1512.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1513.         return AVERROR_INVALIDDATA; // packet type not audio

  1514.     }

  1515. 

  1516.     if (vc->mode_count == 1) {

  1517.         mode_number = 0;

  1518.     } else {

  1519.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1520.     }

  1521.     vc->mode_number = mode_number;

  1522.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1523. 

  1524.     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,

  1525.             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1526. 

  1527.     blockflag = vc->modes[mode_number].blockflag;

  1528.     blocksize = vc->blocksize[blockflag];

  1529.     vlen = blocksize / 2;

  1530.     if (blockflag) {

  1531.         previous_window = get_bits(gb, 1);

  1532.         skip_bits1(gb); // next_window

  1533.     }

  1534. 

  1535.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?

  1536.     memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?

  1537. 

  1538. // Decode floor

  1539. 

  1540.     for (i = 0; i < vc->audio_channels; ++i) {

  1541.         vorbis_floor *floor;

  1542.         int ret;

  1543.         if (mapping->submaps > 1) {

  1544.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1545.         } else {

  1546.             floor = &vc->floors[mapping->submap_floor[0]];

  1547.         }

  1548. 

  1549.         ret = floor->decode(vc, &floor->data, ch_floor_ptr);

  1550. 

  1551.         if (ret < 0) {

  1552.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1553.             return AVERROR_INVALIDDATA;

  1554.         }

  1555.         no_residue[i] = ret;

  1556.         ch_floor_ptr += vlen;

  1557.     }

  1558. 

  1559. // Nonzero vector propagate

  1560. 

  1561.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1562.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1563.             no_residue[mapping->magnitude[i]] = 0;

  1564.             no_residue[mapping->angle[i]]     = 0;

  1565.         }

  1566.     }

  1567. 

  1568. // Decode residue

  1569. 

  1570.     for (i = 0; i < mapping->submaps; ++i) {

  1571.         vorbis_residue *residue;

  1572.         unsigned ch = 0;

  1573.         int ret;

  1574. 

  1575.         for (j = 0; j < vc->audio_channels; ++j) {

  1576.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1577.                 res_chan[j] = res_num;

  1578.                 if (no_residue[j]) {

  1579.                     do_not_decode[ch] = 1;

  1580.                 } else {

  1581.                     do_not_decode[ch] = 0;

  1582.                 }

  1583.                 ++ch;

  1584.                 ++res_num;

  1585.             }

  1586.         }

  1587.         residue = &vc->residues[mapping->submap_residue[i]];

  1588.         if (ch_left < ch) {

  1589.             av_log(vc->avccontext, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");

  1590.             return -1;

  1591.         }

  1592.         if (ch) {

  1593.             ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);

  1594.             if (ret < 0)

  1595.                 return ret;

  1596.         }

  1597. 

  1598.         ch_res_ptr += ch * vlen;

  1599.         ch_left -= ch;

  1600.     }

  1601. 

  1602.     if (ch_left > 0)

  1603.         return AVERROR_INVALIDDATA;

  1604. 

  1605. // Inverse coupling

  1606. 

  1607.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1608.         float *mag, *ang;

  1609. 

  1610.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

  1611.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1612.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1613.     }

  1614. 

  1615. // Dotproduct, MDCT

  1616. 

  1617.     mdct = &vc->mdct[blockflag];

  1618. 

  1619.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1620.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;

  1621.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1622.         vc->fdsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);

  1623.         mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);

  1624.     }

  1625. 

  1626. // Overlap/add, save data for next overlapping  FPMATH

  1627. 

  1628.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

  1629.     for (j = 0; j < vc->audio_channels; j++) {

  1630.         unsigned bs0 = vc->blocksize[0];

  1631.         unsigned bs1 = vc->blocksize[1];

  1632.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1633.         float *saved      = vc->saved + j * bs1 / 4;

  1634.         float *ret        = vc->channel_floors + j * retlen;

  1635.         float *buf        = residue;

  1636.         const float *win  = vc->win[blockflag & previous_window];

  1637. 

  1638.         if (blockflag == previous_window) {

  1639.             vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);

  1640.         } else if (blockflag > previous_window) {

  1641.             vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);

  1642.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1643.         } else {

  1644.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1645.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);

  1646.         }

  1647.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1648.     }

  1649. 

  1650.     vc->previous_window = blockflag;

  1651.     return retlen;

  1652. }

  1653. 

  1654. // Return the decoded audio packet through the standard api

  1655. 

  1656. static int vorbis_decode_frame(AVCodecContext *avccontext, void *data,

  1657.                                int *got_frame_ptr, AVPacket *avpkt)

  1658. {

  1659.     const uint8_t *buf = avpkt->data;

  1660.     int buf_size       = avpkt->size;

  1661.     vorbis_context *vc = avccontext->priv_data;

  1662.     GetBitContext *gb = &vc->gb;

  1663.     const float *channel_ptrs[255];

  1664.     int i, len, ret;

  1665. 

  1666.     av_dlog(NULL, "packet length %d \n", buf_size);

  1667. 

  1668.     init_get_bits(gb, buf, buf_size*8);

  1669. 

  1670.     if ((len = vorbis_parse_audio_packet(vc)) <= 0)

  1671.         return len;

  1672. 

  1673.     if (!vc->first_frame) {

  1674.         vc->first_frame = 1;

  1675.         *got_frame_ptr = 0;

  1676.         return buf_size;

  1677.     }

  1678. 

  1679.     av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",

  1680.             get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);

  1681. 

  1682.     /* get output buffer */

  1683.     vc->frame.nb_samples = len;

  1684.     if ((ret = avccontext->get_buffer(avccontext, &vc->frame)) < 0) {

  1685.         av_log(avccontext, AV_LOG_ERROR, "get_buffer() failed\n");

  1686.         return ret;

  1687.     }

  1688. 

  1689.     if (vc->audio_channels > 8) {

  1690.         for (i = 0; i < vc->audio_channels; i++)

  1691.             channel_ptrs[i] = vc->channel_floors + i * len;

  1692.     } else {

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

  1694.             channel_ptrs[i] = vc->channel_floors +

  1695.                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1696.     }

  1697. 

  1698.     if (avccontext->sample_fmt == AV_SAMPLE_FMT_FLT)

  1699.         vc->fmt_conv.float_interleave((float *)vc->frame.data[0], channel_ptrs,

  1700.                                       len, vc->audio_channels);

  1701.     else

  1702.         vc->fmt_conv.float_to_int16_interleave((int16_t *)vc->frame.data[0],

  1703.                                                channel_ptrs, len,

  1704.                                                vc->audio_channels);

  1705. 

  1706.     *got_frame_ptr   = 1;

  1707.     *(AVFrame *)data = vc->frame;

  1708. 

  1709.     return buf_size;

  1710. }

  1711. 

  1712. // Close decoder

  1713. 

  1714. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1715. {

  1716.     vorbis_context *vc = avccontext->priv_data;

  1717. 

  1718.     vorbis_free(vc);

  1719. 

  1720.     return 0;

  1721. }

  1722. 

  1723. static av_cold void vorbis_decode_flush(AVCodecContext *avccontext)

  1724. {

  1725.     vorbis_context *vc = avccontext->priv_data;

  1726. 

  1727.     if (vc->saved) {

  1728.         memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *

  1729.                              sizeof(*vc->saved));

  1730.     }

  1731.     vc->previous_window = 0;

  1732. }

  1733. 

  1734. AVCodec ff_vorbis_decoder = {

  1735.     .name            = "vorbis",

  1736.     .type            = AVMEDIA_TYPE_AUDIO,

  1737.     .id              = CODEC_ID_VORBIS,

  1738.     .priv_data_size  = sizeof(vorbis_context),

  1739.     .init            = vorbis_decode_init,

  1740.     .close           = vorbis_decode_close,

  1741.     .decode          = vorbis_decode_frame,

  1742.     .flush           = vorbis_decode_flush,

  1743.     .capabilities    = CODEC_CAP_DR1,

  1744.     .long_name       = NULL_IF_CONFIG_SMALL("Vorbis"),

  1745.     .channel_layouts = ff_vorbis_channel_layouts,

  1746.     .sample_fmts     = (const enum AVSampleFormat[]) {

  1747.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE

  1748.     },

  1749. };