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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 "avcodec.h"

  34. #include "get_bits.h"

  35. #include "dsputil.h"

  36. #include "fft.h"

  37. #include "fmtconvert.h"

  38. 

  39. #include "vorbis.h"

  40. #include "xiph.h"

  41. 

  42. #define V_NB_BITS 8

  43. #define V_NB_BITS2 11

  44. #define V_MAX_VLCS (1 << 16)

  45. #define V_MAX_PARTITIONS (1 << 20)

  46. 

  47. #undef NDEBUG

  48. #include <assert.h>

  49. 

  50. typedef struct {

  51.     uint8_t      dimensions;

  52.     uint8_t      lookup_type;

  53.     uint8_t      maxdepth;

  54.     VLC          vlc;

  55.     float       *codevectors;

  56.     unsigned int nb_bits;

  57. } vorbis_codebook;

  58. 

  59. typedef union  vorbis_floor_u  vorbis_floor_data;

  60. typedef struct vorbis_floor0_s vorbis_floor0;

  61. typedef struct vorbis_floor1_s vorbis_floor1;

  62. struct vorbis_context_s;

  63. typedef

  64. int (* vorbis_floor_decode_func)

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

  66. typedef struct {

  67.     uint8_t floor_type;

  68.     vorbis_floor_decode_func decode;

  69.     union vorbis_floor_u {

  70.         struct vorbis_floor0_s {

  71.             uint8_t       order;

  72.             uint16_t      rate;

  73.             uint16_t      bark_map_size;

  74.             int32_t      *map[2];

  75.             uint32_t      map_size[2];

  76.             uint8_t       amplitude_bits;

  77.             uint8_t       amplitude_offset;

  78.             uint8_t       num_books;

  79.             uint8_t      *book_list;

  80.             float        *lsp;

  81.         } t0;

  82.         struct vorbis_floor1_s {

  83.             uint8_t       partitions;

  84.             uint8_t       partition_class[32];

  85.             uint8_t       class_dimensions[16];

  86.             uint8_t       class_subclasses[16];

  87.             uint8_t       class_masterbook[16];

  88.             int16_t       subclass_books[16][8];

  89.             uint8_t       multiplier;

  90.             uint16_t      x_list_dim;

  91.             vorbis_floor1_entry *list;

  92.         } t1;

  93.     } data;

  94. } vorbis_floor;

  95. 

  96. typedef struct {

  97.     uint16_t      type;

  98.     uint32_t      begin;

  99.     uint32_t      end;

  100.     unsigned      partition_size;

  101.     uint8_t       classifications;

  102.     uint8_t       classbook;

  103.     int16_t       books[64][8];

  104.     uint8_t       maxpass;

  105.     uint16_t      ptns_to_read;

  106.     uint8_t      *classifs;

  107. } vorbis_residue;

  108. 

  109. typedef struct {

  110.     uint8_t       submaps;

  111.     uint16_t      coupling_steps;

  112.     uint8_t      *magnitude;

  113.     uint8_t      *angle;

  114.     uint8_t      *mux;

  115.     uint8_t       submap_floor[16];

  116.     uint8_t       submap_residue[16];

  117. } vorbis_mapping;

  118. 

  119. typedef struct {

  120.     uint8_t       blockflag;

  121.     uint16_t      windowtype;

  122.     uint16_t      transformtype;

  123.     uint8_t       mapping;

  124. } vorbis_mode;

  125. 

  126. typedef struct vorbis_context_s {

  127.     AVCodecContext *avccontext;

  128.     AVFrame frame;

  129.     GetBitContext gb;

  130.     DSPContext dsp;

  131.     FmtConvertContext fmt_conv;

  132. 

  133.     FFTContext mdct[2];

  134.     uint8_t       first_frame;

  135.     uint32_t      version;

  136.     uint8_t       audio_channels;

  137.     uint32_t      audio_samplerate;

  138.     uint32_t      bitrate_maximum;

  139.     uint32_t      bitrate_nominal;

  140.     uint32_t      bitrate_minimum;

  141.     uint32_t      blocksize[2];

  142.     const float  *win[2];

  143.     uint16_t      codebook_count;

  144.     vorbis_codebook *codebooks;

  145.     uint8_t       floor_count;

  146.     vorbis_floor *floors;

  147.     uint8_t       residue_count;

  148.     vorbis_residue *residues;

  149.     uint8_t       mapping_count;

  150.     vorbis_mapping *mappings;

  151.     uint8_t       mode_count;

  152.     vorbis_mode  *modes;

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

  154.     uint8_t       previous_window;

  155.     float        *channel_residues;

  156.     float        *channel_floors;

  157.     float        *saved;

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

  159. } vorbis_context;

  160. 

  161. /* Helper functions */

  162. 

  163. #define BARK(x) \

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

  165. 

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

  167. #define VALIDATE_INDEX(idx, limit) \

  168.     if (idx >= limit) {\

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

  170.                idx_err_str,\

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

  172.         return AVERROR_INVALIDDATA;\

  173.     }

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

  175.     {\

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

  177.         VALIDATE_INDEX(idx, limit)\

  178.     }

  179. 

  180. static float vorbisfloat2float(unsigned val)

  181. {

  182.     double mant = val & 0x1fffff;

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

  184.     if (val & 0x80000000)

  185.         mant = -mant;

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

  187. }

  188. 

  189. 

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

  191. 

  192. static void vorbis_free(vorbis_context *vc)

  193. {

  194.     int i;

  195. 

  196.     av_freep(&vc->channel_residues);

  197.     av_freep(&vc->channel_floors);

  198.     av_freep(&vc->saved);

  199. 

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

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

  202.     av_freep(&vc->residues);

  203.     av_freep(&vc->modes);

  204. 

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

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

  207. 

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

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

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

  211.     }

  212.     av_freep(&vc->codebooks);

  213. 

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

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

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

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

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

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

  220.         } else {

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

  222.         }

  223.     }

  224.     av_freep(&vc->floors);

  225. 

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

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

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

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

  230.     }

  231.     av_freep(&vc->mappings);

  232. }

  233. 

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

  235. 

  236. // Process codebooks part

  237. 

  238. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  239. {

  240.     unsigned cb;

  241.     uint8_t  *tmp_vlc_bits;

  242.     uint32_t *tmp_vlc_codes;

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

  244.     uint16_t *codebook_multiplicands;

  245.     int ret = 0;

  246. 

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

  248. 

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

  250. 

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

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

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

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

  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->avccontext, 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->avccontext, 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->avccontext, 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->avccontext, 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->avccontext, "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->avccontext, "real lookup offset %u, vector: ", j);

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

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

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

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

  402. 

  403.                     ++j;

  404.                 }

  405.             }

  406.             if (j != used_entries) {

  407.                 av_log(vc->avccontext, 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->avccontext, 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->avccontext, 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->avccontext, 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->avccontext, 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 void 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;

  491. 

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

  493. 

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

  495. 

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

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

  498. 

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

  500. 

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

  502. 

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

  504.             int maximum_class = -1;

  505.             unsigned rangebits, rangemax, floor1_values = 2;

  506. 

  507.             floor_setup->decode = vorbis_floor1_decode;

  508. 

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

  510. 

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

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

  513. 

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

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

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

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

  518. 

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

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

  521. 

  522.             }

  523. 

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

  525. 

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

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

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

  529. 

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

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

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

  533. 

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

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

  536. 

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

  538.                 }

  539. 

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

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

  542.                     if (bits != -1)

  543.                         VALIDATE_INDEX(bits, vc->codebook_count)

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

  545. 

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

  547.                 }

  548.             }

  549. 

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

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

  552. 

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

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

  555. 

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

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

  558. 

  559. 

  560.             rangebits = get_bits(gb, 4);

  561.             rangemax = (1 << rangebits);

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

  563.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

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

  566.                 return AVERROR_INVALIDDATA;

  567.             }

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

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

  570. 

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

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

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

  574. 

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

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

  577.                 }

  578.             }

  579. 

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

  581.             if (ff_vorbis_ready_floor1_list(vc->avccontext,

  582.                                             floor_setup->data.t1.list,

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

  584.                 return AVERROR_INVALIDDATA;

  585.             }

  586. 

  587.             for (j=1; j<floor_setup->data.t1.x_list_dim; j++) {

  588.                 if (   floor_setup->data.t1.list[ floor_setup->data.t1.list[j-1].sort ].x

  589.                     == floor_setup->data.t1.list[ floor_setup->data.t1.list[j  ].sort ].x) {

  590.                     av_log(vc->avccontext, AV_LOG_ERROR, "Non unique x values in floor type 1\n");

  591.                     return AVERROR_INVALIDDATA;

  592.                 }

  593.             }

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

  595.             unsigned max_codebook_dim = 0;

  596. 

  597.             floor_setup->decode = vorbis_floor0_decode;

  598. 

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

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

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

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

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

  604.              * 2^0 - 1 == 0                             */

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

  606.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

  608.                 return AVERROR_INVALIDDATA;

  609.             }

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

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

  612. 

  613.             /* allocate mem for booklist */

  614.             floor_setup->data.t0.book_list =

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

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

  617.                 return AVERROR(ENOMEM);

  618.             /* read book indexes */

  619.             {

  620.                 int idx;

  621.                 unsigned book_idx;

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

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

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

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

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

  627.                 }

  628.             }

  629. 

  630.             create_map(vc, i);

  631. 

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

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

  634.             floor_setup->data.t0.lsp =

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

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

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

  638.                 return AVERROR(ENOMEM);

  639. 

  640.             /* debug output parsed headers */

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

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

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

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

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

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

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

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

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

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

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

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

  653.             {

  654.                 int idx;

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

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

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

  658.                 }

  659.             }

  660.         } else {

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

  662.             return AVERROR_INVALIDDATA;

  663.         }

  664.     }

  665.     return 0;

  666. }

  667. 

  668. // Process residues part

  669. 

  670. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  671. {

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

  673.     unsigned i, j, k;

  674. 

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

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

  677. 

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

  679. 

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

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

  682.         uint8_t cascade[64];

  683.         unsigned high_bits, low_bits;

  684. 

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

  686. 

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

  688. 

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

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

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

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

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

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

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

  696.             av_log(vc->avccontext, AV_LOG_ERROR,

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

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

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

  700.             return AVERROR_INVALIDDATA;

  701.         }

  702. 

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

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

  705. 

  706.         res_setup->ptns_to_read =

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

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

  709.                                         vc->audio_channels *

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

  711.         if (!res_setup->classifs)

  712.             return AVERROR(ENOMEM);

  713. 

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

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

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

  717. 

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

  719.             high_bits = 0;

  720.             low_bits  = get_bits(gb, 3);

  721.             if (get_bits1(gb))

  722.                 high_bits = get_bits(gb, 5);

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

  724. 

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

  726.         }

  727. 

  728.         res_setup->maxpass = 0;

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

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

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

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

  733. 

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

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

  736. 

  737.                     if (k>res_setup->maxpass)

  738.                         res_setup->maxpass = k;

  739.                 } else {

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

  741.                 }

  742.             }

  743.         }

  744.     }

  745.     return 0;

  746. }

  747. 

  748. // Process mappings part

  749. 

  750. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  751. {

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

  753.     unsigned i, j;

  754. 

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

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

  757. 

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

  759. 

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

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

  762. 

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

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

  765.             return AVERROR_INVALIDDATA;

  766.         }

  767.         if (get_bits1(gb)) {

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

  769.         } else {

  770.             mapping_setup->submaps = 1;

  771.         }

  772. 

  773.         if (get_bits1(gb)) {

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

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

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

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

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

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

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

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

  782.             }

  783.         } else {

  784.             mapping_setup->coupling_steps = 0;

  785.         }

  786. 

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

  788.                 i, mapping_setup->coupling_steps);

  789. 

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

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

  792.             return AVERROR_INVALIDDATA; // following spec.

  793.         }

  794. 

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

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

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

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

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

  800.         }

  801. 

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

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

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

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

  806. 

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

  808.                     mapping_setup->submap_floor[j],

  809.                     mapping_setup->submap_residue[j]);

  810.         }

  811.     }

  812.     return 0;

  813. }

  814. 

  815. // Process modes part

  816. 

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

  818. {

  819.     vorbis_floor *floors = vc->floors;

  820.     vorbis_floor0 *vf;

  821.     int idx;

  822.     int blockflag, n;

  823.     int32_t *map;

  824. 

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

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

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

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

  829. 

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

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

  832. 

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

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

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

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

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

  838.         }

  839.         map[n] = -1;

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

  841.     }

  842. 

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

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

  845.     }

  846. }

  847. 

  848. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  849. {

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

  851.     unsigned i;

  852. 

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

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

  855. 

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

  857. 

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

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

  860. 

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

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

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

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

  865. 

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

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

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

  869.     }

  870.     return 0;

  871. }

  872. 

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

  874. 

  875. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  876. {

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

  878.     int ret;

  879. 

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

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

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

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

  884.         return AVERROR_INVALIDDATA;

  885.     }

  886. 

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

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

  889.         return ret;

  890.     }

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

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

  893.         return ret;

  894.     }

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

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

  897.         return ret;

  898.     }

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

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

  901.         return ret;

  902.     }

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

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

  905.         return ret;

  906.     }

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

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

  909.         return ret;

  910.     }

  911.     if (!get_bits1(gb)) {

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

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

  914.     }

  915. 

  916.     return 0;

  917. }

  918. 

  919. // Process the identification header

  920. 

  921. static int vorbis_parse_id_hdr(vorbis_context *vc)

  922. {

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

  924.     unsigned bl0, bl1;

  925. 

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

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

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

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

  930.         return AVERROR_INVALIDDATA;

  931.     }

  932. 

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

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

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

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

  937.         return AVERROR_INVALIDDATA;

  938.     }

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

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

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

  942.         return AVERROR_INVALIDDATA;

  943.     }

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

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

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

  947.     bl0 = get_bits(gb, 4);

  948.     bl1 = get_bits(gb, 4);

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

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

  951.         return AVERROR_INVALIDDATA;

  952.     }

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

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

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

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

  957. 

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

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

  960.         return AVERROR_INVALIDDATA;

  961.     }

  962. 

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

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

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

  966.     vc->previous_window  = 0;

  967. 

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

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

  970. 

  971.     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 ",

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

  973. 

  974. /*

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

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

  977.         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)));

  978.     }

  979. */

  980. 

  981.     return 0;

  982. }

  983. 

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

  985. 

  986. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  987. {

  988.     vorbis_context *vc = avccontext->priv_data;

  989.     uint8_t *headers   = avccontext->extradata;

  990.     int headers_len    = avccontext->extradata_size;

  991.     uint8_t *header_start[3];

  992.     int header_len[3];

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

  994.     int hdr_type, ret;

  995. 

  996.     vc->avccontext = avccontext;

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

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

  999. 

  1000.     if (avccontext->request_sample_fmt == AV_SAMPLE_FMT_FLT) {

  1001.         avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;

  1002.         vc->scale_bias = 1.0f;

  1003.     } else {

  1004.         avccontext->sample_fmt = AV_SAMPLE_FMT_S16;

  1005.         vc->scale_bias = 32768.0f;

  1006.     }

  1007. 

  1008.     if (!headers_len) {

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

  1010.         return AVERROR_INVALIDDATA;

  1011.     }

  1012. 

  1013.     if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {

  1014.         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");

  1015.         return ret;

  1016.     }

  1017. 

  1018.     init_get_bits(gb, header_start[0], header_len[0]*8);

  1019.     hdr_type = get_bits(gb, 8);

  1020.     if (hdr_type != 1) {

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

  1022.         return AVERROR_INVALIDDATA;

  1023.     }

  1024.     if ((ret = vorbis_parse_id_hdr(vc))) {

  1025.         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");

  1026.         vorbis_free(vc);

  1027.         return ret;

  1028.     }

  1029. 

  1030.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1031.     hdr_type = get_bits(gb, 8);

  1032.     if (hdr_type != 5) {

  1033.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1034.         vorbis_free(vc);

  1035.         return AVERROR_INVALIDDATA;

  1036.     }

  1037.     if ((ret = vorbis_parse_setup_hdr(vc))) {

  1038.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1039.         vorbis_free(vc);

  1040.         return ret;

  1041.     }

  1042. 

  1043.     if (vc->audio_channels > 8)

  1044.         avccontext->channel_layout = 0;

  1045.     else

  1046.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1047. 

  1048.     avccontext->channels    = vc->audio_channels;

  1049.     avccontext->sample_rate = vc->audio_samplerate;

  1050.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;

  1051. 

  1052.     avcodec_get_frame_defaults(&vc->frame);

  1053.     avccontext->coded_frame = &vc->frame;

  1054. 

  1055.     return 0;

  1056. }

  1057. 

  1058. // Decode audiopackets -------------------------------------------------

  1059. 

  1060. // Read and decode floor

  1061. 

  1062. static int vorbis_floor0_decode(vorbis_context *vc,

  1063.                                 vorbis_floor_data *vfu, float *vec)

  1064. {

  1065.     vorbis_floor0 *vf = &vfu->t0;

  1066.     float *lsp = vf->lsp;

  1067.     unsigned amplitude, book_idx;

  1068.     unsigned blockflag = vc->modes[vc->mode_number].blockflag;

  1069. 

  1070.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1071.     if (amplitude > 0) {

  1072.         float last = 0;

  1073.         unsigned idx, lsp_len = 0;

  1074.         vorbis_codebook codebook;

  1075. 

  1076.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1077.         if (book_idx >= vf->num_books) {

  1078.             av_log(vc->avccontext, AV_LOG_ERROR,

  1079.                     "floor0 dec: booknumber too high!\n");

  1080.             book_idx =  0;

  1081.         }

  1082.         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);

  1083.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1084.         /* Invalid codebook! */

  1085.         if (!codebook.codevectors)

  1086.             return AVERROR_INVALIDDATA;

  1087. 

  1088.         while (lsp_len<vf->order) {

  1089.             int vec_off;

  1090. 

  1091.             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);

  1092.             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1093.             /* read temp vector */

  1094.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1095.                                codebook.nb_bits, codebook.maxdepth)

  1096.                       * codebook.dimensions;

  1097.             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);

  1098.             /* copy each vector component and add last to it */

  1099.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1100.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1101.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1102. 

  1103.             lsp_len += codebook.dimensions;

  1104.         }

  1105.         /* DEBUG: output lsp coeffs */

  1106.         {

  1107.             int idx;

  1108.             for (idx = 0; idx < lsp_len; ++idx)

  1109.                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1110.         }

  1111. 

  1112.         /* synthesize floor output vector */

  1113.         {

  1114.             int i;

  1115.             int order = vf->order;

  1116.             float wstep = M_PI / vf->bark_map_size;

  1117. 

  1118.             for (i = 0; i < order; i++)

  1119.                 lsp[i] = 2.0f * cos(lsp[i]);

  1120. 

  1121.             av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",

  1122.                     vf->map_size[blockflag], order, wstep);

  1123. 

  1124.             i = 0;

  1125.             while (i < vf->map_size[blockflag]) {

  1126.                 int j, iter_cond = vf->map[blockflag][i];

  1127.                 float p = 0.5f;

  1128.                 float q = 0.5f;

  1129.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1130. 

  1131.                 /* similar part for the q and p products */

  1132.                 for (j = 0; j + 1 < order; j += 2) {

  1133.                     q *= lsp[j]     - two_cos_w;

  1134.                     p *= lsp[j + 1] - two_cos_w;

  1135.                 }

  1136.                 if (j == order) { // even order

  1137.                     p *= p * (2.0f - two_cos_w);

  1138.                     q *= q * (2.0f + two_cos_w);

  1139.                 } else { // odd order

  1140.                     q *= two_cos_w-lsp[j]; // one more time for q

  1141. 

  1142.                     /* final step and square */

  1143.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1144.                     q *= q;

  1145.                 }

  1146. 

  1147.                 /* calculate linear floor value */

  1148.                 q = exp((((amplitude*vf->amplitude_offset) /

  1149.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1150.                          - vf->amplitude_offset) * .11512925f);

  1151. 

  1152.                 /* fill vector */

  1153.                 do {

  1154.                     vec[i] = q; ++i;

  1155.                 } while (vf->map[blockflag][i] == iter_cond);

  1156.             }

  1157.         }

  1158.     } else {

  1159.         /* this channel is unused */

  1160.         return 1;

  1161.     }

  1162. 

  1163.     av_dlog(NULL, " Floor0 decoded\n");

  1164. 

  1165.     return 0;

  1166. }

  1167. 

  1168. static int vorbis_floor1_decode(vorbis_context *vc,

  1169.                                 vorbis_floor_data *vfu, float *vec)

  1170. {

  1171.     vorbis_floor1 *vf = &vfu->t1;

  1172.     GetBitContext *gb = &vc->gb;

  1173.     uint16_t range_v[4] = { 256, 128, 86, 64 };

  1174.     unsigned range = range_v[vf->multiplier - 1];

  1175.     uint16_t floor1_Y[258];

  1176.     uint16_t floor1_Y_final[258];

  1177.     int floor1_flag[258];

  1178.     unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;

  1179.     int book, adx, ady, dy, off, predicted, err;

  1180. 

  1181. 

  1182.     if (!get_bits1(gb)) // silence

  1183.         return 1;

  1184. 

  1185. // Read values (or differences) for the floor's points

  1186. 

  1187.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1188.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1189. 

  1190.     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1191. 

  1192.     offset = 2;

  1193.     for (i = 0; i < vf->partitions; ++i) {

  1194.         partition_class = vf->partition_class[i];

  1195.         cdim   = vf->class_dimensions[partition_class];

  1196.         cbits  = vf->class_subclasses[partition_class];

  1197.         csub = (1 << cbits) - 1;

  1198.         cval = 0;

  1199. 

  1200.         av_dlog(NULL, "Cbits %u\n", cbits);

  1201. 

  1202.         if (cbits) // this reads all subclasses for this partition's class

  1203.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,

  1204.                             vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);

  1205. 

  1206.         for (j = 0; j < cdim; ++j) {

  1207.             book = vf->subclass_books[partition_class][cval & csub];

  1208. 

  1209.             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",

  1210.                     book, cbits, cval, get_bits_count(gb));

  1211. 

  1212.             cval = cval >> cbits;

  1213.             if (book > -1) {

  1214.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1215.                 vc->codebooks[book].nb_bits, 3);

  1216.             } else {

  1217.                 floor1_Y[offset+j] = 0;

  1218.             }

  1219. 

  1220.             av_dlog(NULL, " floor(%d) = %d \n",

  1221.                     vf->list[offset+j].x, floor1_Y[offset+j]);

  1222.         }

  1223.         offset+=cdim;

  1224.     }

  1225. 

  1226. // Amplitude calculation from the differences

  1227. 

  1228.     floor1_flag[0] = 1;

  1229.     floor1_flag[1] = 1;

  1230.     floor1_Y_final[0] = floor1_Y[0];

  1231.     floor1_Y_final[1] = floor1_Y[1];

  1232. 

  1233.     for (i = 2; i < vf->x_list_dim; ++i) {

  1234.         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;

  1235. 

  1236.         low_neigh_offs  = vf->list[i].low;

  1237.         high_neigh_offs = vf->list[i].high;

  1238.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1239.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1240.         ady = FFABS(dy);

  1241.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1242.         off = err / adx;

  1243.         if (dy < 0) {

  1244.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1245.         } else {

  1246.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1247.         } // render_point end

  1248. 

  1249.         val = floor1_Y[i];

  1250.         highroom = range-predicted;

  1251.         lowroom  = predicted;

  1252.         if (highroom < lowroom) {

  1253.             room = highroom * 2;

  1254.         } else {

  1255.             room = lowroom * 2;   // SPEC mispelling

  1256.         }

  1257.         if (val) {

  1258.             floor1_flag[low_neigh_offs]  = 1;

  1259.             floor1_flag[high_neigh_offs] = 1;

  1260.             floor1_flag[i]               = 1;

  1261.             if (val >= room) {

  1262.                 if (highroom > lowroom) {

  1263.                     floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);

  1264.                 } else {

  1265.                     floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);

  1266.                 }

  1267.             } else {

  1268.                 if (val & 1) {

  1269.                     floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);

  1270.                 } else {

  1271.                     floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);

  1272.                 }

  1273.             }

  1274.         } else {

  1275.             floor1_flag[i]    = 0;

  1276.             floor1_Y_final[i] = av_clip_uint16(predicted);

  1277.         }

  1278. 

  1279.         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",

  1280.                 vf->list[i].x, floor1_Y_final[i], val);

  1281.     }

  1282. 

  1283. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1284. 

  1285.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1286. 

  1287.     av_dlog(NULL, " Floor decoded\n");

  1288. 

  1289.     return 0;

  1290. }

  1291. 

  1292. // Read and decode residue

  1293. 

  1294. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1295.                                                            vorbis_residue *vr,

  1296.                                                            unsigned ch,

  1297.                                                            uint8_t *do_not_decode,

  1298.                                                            float *vec,

  1299.                                                            unsigned vlen,

  1300.                                                            unsigned ch_left,

  1301.                                                            int vr_type)

  1302. {

  1303.     GetBitContext *gb = &vc->gb;

  1304.     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;

  1305.     unsigned ptns_to_read = vr->ptns_to_read;

  1306.     uint8_t *classifs = vr->classifs;

  1307.     unsigned pass, ch_used, i, j, k, l;

  1308.     unsigned max_output = (ch - 1) * vlen;

  1309. 

  1310.     if (vr_type == 2) {

  1311.         for (j = 1; j < ch; ++j)

  1312.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1313.         if (do_not_decode[0])

  1314.             return 0;

  1315.         ch_used = 1;

  1316.         max_output += vr->end / ch;

  1317.     } else {

  1318.         ch_used = ch;

  1319.         max_output += vr->end;

  1320.     }

  1321. 

  1322.     if (max_output > ch_left * vlen) {

  1323.         av_log(vc->avccontext, AV_LOG_ERROR, "Insufficient output buffer\n");

  1324.         return -1;

  1325.     }

  1326. 

  1327.     av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1328. 

  1329.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1330.         uint16_t voffset, partition_count, j_times_ptns_to_read;

  1331. 

  1332.         voffset = vr->begin;

  1333.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1334.             if (!pass) {

  1335.                 unsigned inverse_class = ff_inverse[vr->classifications];

  1336.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1337.                     if (!do_not_decode[j]) {

  1338.                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1339.                                                  vc->codebooks[vr->classbook].nb_bits, 3);

  1340. 

  1341.                         av_dlog(NULL, "Classword: %u\n", temp);

  1342. 

  1343.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1344.                         for (i = 0; i < c_p_c; ++i) {

  1345.                             unsigned temp2;

  1346. 

  1347.                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;

  1348.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1349.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1350.                             temp = temp2;

  1351.                         }

  1352.                     }

  1353.                     j_times_ptns_to_read += ptns_to_read;

  1354.                 }

  1355.             }

  1356.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1357.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1358.                     unsigned voffs;

  1359. 

  1360.                     if (!do_not_decode[j]) {

  1361.                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];

  1362.                         int vqbook  = vr->books[vqclass][pass];

  1363. 

  1364.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1365.                             unsigned coffs;

  1366.                             unsigned dim  = vc->codebooks[vqbook].dimensions;

  1367.                             unsigned step = dim == 1 ? vr->partition_size

  1368.                                                      : FASTDIV(vr->partition_size, dim);

  1369.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1370. 

  1371.                             if (vr_type == 0) {

  1372. 

  1373.                                 voffs = voffset+j*vlen;

  1374.                                 for (k = 0; k < step; ++k) {

  1375.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1376.                                     for (l = 0; l < dim; ++l)

  1377.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH

  1378.                                 }

  1379.                             } else if (vr_type == 1) {

  1380.                                 voffs = voffset + j * vlen;

  1381.                                 for (k = 0; k < step; ++k) {

  1382.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1383.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1384.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1385. 

  1386.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d  \n",

  1387.                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1388.                                     }

  1389.                                 }

  1390.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1391.                                 voffs = voffset >> 1;

  1392. 

  1393.                                 if (dim == 2) {

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

  1395.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

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

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

  1398.                                     }

  1399.                                 } else if (dim == 4) {

  1400.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1401.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1402.                                         vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH

  1403.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH

  1404.                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH

  1405.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH

  1406.                                     }

  1407.                                 } else

  1408.                                 for (k = 0; k < step; ++k) {

  1409.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1410.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1411.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH

  1412.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH

  1413. 

  1414.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1415.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1416.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1417.                                                 codebook.codevectors[coffs + l], coffs, l);

  1418.                                     }

  1419.                                 }

  1420. 

  1421.                             } else if (vr_type == 2) {

  1422.                                 voffs = voffset;

  1423. 

  1424.                                 for (k = 0; k < step; ++k) {

  1425.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1426.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1427.                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %

  1428. 

  1429.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1430.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1431.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1432.                                                 codebook.codevectors[coffs + l], coffs, l);

  1433.                                     }

  1434.                                 }

  1435.                             }

  1436.                         }

  1437.                     }

  1438.                     j_times_ptns_to_read += ptns_to_read;

  1439.                 }

  1440.                 ++partition_count;

  1441.                 voffset += vr->partition_size;

  1442.             }

  1443.         }

  1444.     }

  1445.     return 0;

  1446. }

  1447. 

  1448. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1449.                                         unsigned ch,

  1450.                                         uint8_t *do_not_decode,

  1451.                                         float *vec, unsigned vlen,

  1452.                                         unsigned ch_left)

  1453. {

  1454.     if (vr->type == 2)

  1455.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);

  1456.     else if (vr->type == 1)

  1457.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);

  1458.     else if (vr->type == 0)

  1459.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);

  1460.     else {

  1461.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1462.         return AVERROR_INVALIDDATA;

  1463.     }

  1464. }

  1465. 

  1466. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1467. {

  1468.     int i;

  1469.     for (i = 0;  i < blocksize;  i++) {

  1470.         if (mag[i] > 0.0) {

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

  1472.                 ang[i] = mag[i] - ang[i];

  1473.             } else {

  1474.                 float temp = ang[i];

  1475.                 ang[i]     = mag[i];

  1476.                 mag[i]    += temp;

  1477.             }

  1478.         } else {

  1479.             if (ang[i] > 0.0) {

  1480.                 ang[i] += mag[i];

  1481.             } else {

  1482.                 float temp = ang[i];

  1483.                 ang[i]     = mag[i];

  1484.                 mag[i]    -= temp;

  1485.             }

  1486.         }

  1487.     }

  1488. }

  1489. 

  1490. // Decode the audio packet using the functions above

  1491. 

  1492. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1493. {

  1494.     GetBitContext *gb = &vc->gb;

  1495.     FFTContext *mdct;

  1496.     unsigned previous_window = vc->previous_window;

  1497.     unsigned mode_number, blockflag, blocksize;

  1498.     int i, j;

  1499.     uint8_t no_residue[255];

  1500.     uint8_t do_not_decode[255];

  1501.     vorbis_mapping *mapping;

  1502.     float *ch_res_ptr   = vc->channel_residues;

  1503.     float *ch_floor_ptr = vc->channel_floors;

  1504.     uint8_t res_chan[255];

  1505.     unsigned res_num = 0;

  1506.     int retlen  = 0;

  1507.     unsigned ch_left = vc->audio_channels;

  1508.     unsigned vlen;

  1509. 

  1510.     if (get_bits1(gb)) {

  1511.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1512.         return AVERROR_INVALIDDATA; // packet type not audio

  1513.     }

  1514. 

  1515.     if (vc->mode_count == 1) {

  1516.         mode_number = 0;

  1517.     } else {

  1518.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1519.     }

  1520.     vc->mode_number = mode_number;

  1521.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1522. 

  1523.     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,

  1524.             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1525. 

  1526.     blockflag = vc->modes[mode_number].blockflag;

  1527.     blocksize = vc->blocksize[blockflag];

  1528.     vlen = blocksize / 2;

  1529.     if (blockflag)

  1530.         skip_bits(gb, 2); // previous_window, next_window

  1531. 

  1532.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?

  1533.     memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?

  1534. 

  1535. // Decode floor

  1536. 

  1537.     for (i = 0; i < vc->audio_channels; ++i) {

  1538.         vorbis_floor *floor;

  1539.         int ret;

  1540.         if (mapping->submaps > 1) {

  1541.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1542.         } else {

  1543.             floor = &vc->floors[mapping->submap_floor[0]];

  1544.         }

  1545. 

  1546.         ret = floor->decode(vc, &floor->data, ch_floor_ptr);

  1547. 

  1548.         if (ret < 0) {

  1549.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1550.             return AVERROR_INVALIDDATA;

  1551.         }

  1552.         no_residue[i] = ret;

  1553.         ch_floor_ptr += vlen;

  1554.     }

  1555. 

  1556. // Nonzero vector propagate

  1557. 

  1558.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1559.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1560.             no_residue[mapping->magnitude[i]] = 0;

  1561.             no_residue[mapping->angle[i]]     = 0;

  1562.         }

  1563.     }

  1564. 

  1565. // Decode residue

  1566. 

  1567.     for (i = 0; i < mapping->submaps; ++i) {

  1568.         vorbis_residue *residue;

  1569.         unsigned ch = 0;

  1570.         int ret;

  1571. 

  1572.         for (j = 0; j < vc->audio_channels; ++j) {

  1573.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1574.                 res_chan[j] = res_num;

  1575.                 if (no_residue[j]) {

  1576.                     do_not_decode[ch] = 1;

  1577.                 } else {

  1578.                     do_not_decode[ch] = 0;

  1579.                 }

  1580.                 ++ch;

  1581.                 ++res_num;

  1582.             }

  1583.         }

  1584.         residue = &vc->residues[mapping->submap_residue[i]];

  1585.         if (ch_left < ch) {

  1586.             av_log(vc->avccontext, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");

  1587.             return -1;

  1588.         }

  1589.         if (ch) {

  1590.             ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);

  1591.             if (ret < 0)

  1592.                 return ret;

  1593.         }

  1594. 

  1595.         ch_res_ptr += ch * vlen;

  1596.         ch_left -= ch;

  1597.     }

  1598. 

  1599. // Inverse coupling

  1600. 

  1601.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1602.         float *mag, *ang;

  1603. 

  1604.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

  1605.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1606.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1607.     }

  1608. 

  1609. // Dotproduct, MDCT

  1610. 

  1611.     mdct = &vc->mdct[blockflag];

  1612. 

  1613.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1614.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;

  1615.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1616.         vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);

  1617.         mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);

  1618.     }

  1619. 

  1620. // Overlap/add, save data for next overlapping  FPMATH

  1621. 

  1622.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

  1623.     for (j = 0; j < vc->audio_channels; j++) {

  1624.         unsigned bs0 = vc->blocksize[0];

  1625.         unsigned bs1 = vc->blocksize[1];

  1626.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1627.         float *saved      = vc->saved + j * bs1 / 4;

  1628.         float *ret        = vc->channel_floors + j * retlen;

  1629.         float *buf        = residue;

  1630.         const float *win  = vc->win[blockflag & previous_window];

  1631. 

  1632.         if (blockflag == previous_window) {

  1633.             vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);

  1634.         } else if (blockflag > previous_window) {

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

  1636.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1637.         } else {

  1638.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1639.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);

  1640.         }

  1641.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1642.     }

  1643. 

  1644.     vc->previous_window = blockflag;

  1645.     return retlen;

  1646. }

  1647. 

  1648. // Return the decoded audio packet through the standard api

  1649. 

  1650. static int vorbis_decode_frame(AVCodecContext *avccontext, void *data,

  1651.                                int *got_frame_ptr, AVPacket *avpkt)

  1652. {

  1653.     const uint8_t *buf = avpkt->data;

  1654.     int buf_size       = avpkt->size;

  1655.     vorbis_context *vc = avccontext->priv_data;

  1656.     GetBitContext *gb = &vc->gb;

  1657.     const float *channel_ptrs[255];

  1658.     int i, len, ret;

  1659. 

  1660.     av_dlog(NULL, "packet length %d \n", buf_size);

  1661. 

  1662.     init_get_bits(gb, buf, buf_size*8);

  1663. 

  1664.     if ((len = vorbis_parse_audio_packet(vc)) <= 0)

  1665.         return len;

  1666. 

  1667.     if (!vc->first_frame) {

  1668.         vc->first_frame = 1;

  1669.         *got_frame_ptr = 0;

  1670.         return buf_size;

  1671.     }

  1672. 

  1673.     av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",

  1674.             get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);

  1675. 

  1676.     /* get output buffer */

  1677.     vc->frame.nb_samples = len;

  1678.     if ((ret = avccontext->get_buffer(avccontext, &vc->frame)) < 0) {

  1679.         av_log(avccontext, AV_LOG_ERROR, "get_buffer() failed\n");

  1680.         return ret;

  1681.     }

  1682. 

  1683.     if (vc->audio_channels > 8) {

  1684.         for (i = 0; i < vc->audio_channels; i++)

  1685.             channel_ptrs[i] = vc->channel_floors + i * len;

  1686.     } else {

  1687.         for (i = 0; i < vc->audio_channels; i++)

  1688.             channel_ptrs[i] = vc->channel_floors +

  1689.                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1690.     }

  1691. 

  1692.     if (avccontext->sample_fmt == AV_SAMPLE_FMT_FLT)

  1693.         vc->fmt_conv.float_interleave((float *)vc->frame.data[0], channel_ptrs,

  1694.                                       len, vc->audio_channels);

  1695.     else

  1696.         vc->fmt_conv.float_to_int16_interleave((int16_t *)vc->frame.data[0],

  1697.                                                channel_ptrs, len,

  1698.                                                vc->audio_channels);

  1699. 

  1700.     *got_frame_ptr   = 1;

  1701.     *(AVFrame *)data = vc->frame;

  1702. 

  1703.     return buf_size;

  1704. }

  1705. 

  1706. // Close decoder

  1707. 

  1708. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1709. {

  1710.     vorbis_context *vc = avccontext->priv_data;

  1711. 

  1712.     vorbis_free(vc);

  1713. 

  1714.     return 0;

  1715. }

  1716. 

  1717. AVCodec ff_vorbis_decoder = {

  1718.     .name           = "vorbis",

  1719.     .type           = AVMEDIA_TYPE_AUDIO,

  1720.     .id             = CODEC_ID_VORBIS,

  1721.     .priv_data_size = sizeof(vorbis_context),

  1722.     .init           = vorbis_decode_init,

  1723.     .close          = vorbis_decode_close,

  1724.     .decode         = vorbis_decode_frame,

  1725.     .capabilities   = CODEC_CAP_DR1,

  1726.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1727.     .channel_layouts = ff_vorbis_channel_layouts,

  1728.     .sample_fmts = (const enum AVSampleFormat[]) {

  1729.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE

  1730.     },

  1731. };