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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 ALT_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.     GetBitContext gb;

  129.     DSPContext dsp;

  130.     FmtConvertContext fmt_conv;

  131. 

  132.     FFTContext mdct[2];

  133.     uint8_t       first_frame;

  134.     uint32_t      version;

  135.     uint8_t       audio_channels;

  136.     uint32_t      audio_samplerate;

  137.     uint32_t      bitrate_maximum;

  138.     uint32_t      bitrate_nominal;

  139.     uint32_t      bitrate_minimum;

  140.     uint32_t      blocksize[2];

  141.     const float  *win[2];

  142.     uint16_t      codebook_count;

  143.     vorbis_codebook *codebooks;

  144.     uint8_t       floor_count;

  145.     vorbis_floor *floors;

  146.     uint8_t       residue_count;

  147.     vorbis_residue *residues;

  148.     uint8_t       mapping_count;

  149.     vorbis_mapping *mappings;

  150.     uint8_t       mode_count;

  151.     vorbis_mode  *modes;

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

  153.     uint8_t       previous_window;

  154.     float        *channel_residues;

  155.     float        *channel_floors;

  156.     float        *saved;

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

  158. } vorbis_context;

  159. 

  160. /* Helper functions */

  161. 

  162. #define BARK(x) \

  163.     (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))

  164. 

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

  166. #define VALIDATE_INDEX(idx, limit) \

  167.     if (idx >= limit) {\

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

  169.                idx_err_str,\

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

  171.         return AVERROR_INVALIDDATA;\

  172.     }

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

  174.     {\

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

  176.         VALIDATE_INDEX(idx, limit)\

  177.     }

  178. 

  179. static float vorbisfloat2float(unsigned val)

  180. {

  181.     double mant = val & 0x1fffff;

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

  183.     if (val & 0x80000000)

  184.         mant = -mant;

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

  186. }

  187. 

  188. 

  189. // Free all allocated memory -----------------------------------------

  190. 

  191. static void vorbis_free(vorbis_context *vc)

  192. {

  193.     int i;

  194. 

  195.     av_freep(&vc->channel_residues);

  196.     av_freep(&vc->channel_floors);

  197.     av_freep(&vc->saved);

  198. 

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

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

  201.     av_freep(&vc->residues);

  202.     av_freep(&vc->modes);

  203. 

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

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

  206. 

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

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

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

  210.     }

  211.     av_freep(&vc->codebooks);

  212. 

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

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

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

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

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

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

  219.         } else {

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

  221.         }

  222.     }

  223.     av_freep(&vc->floors);

  224. 

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

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

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

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

  229.     }

  230.     av_freep(&vc->mappings);

  231. }

  232. 

  233. // Parse setup header -------------------------------------------------

  234. 

  235. // Process codebooks part

  236. 

  237. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  238. {

  239.     unsigned cb;

  240.     uint8_t  *tmp_vlc_bits;

  241.     uint32_t *tmp_vlc_codes;

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

  243.     uint16_t *codebook_multiplicands;

  244.     int ret = 0;

  245. 

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

  247. 

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

  249. 

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

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

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

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

  254. 

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

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

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

  258. 

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

  260. 

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

  262.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  264.             ret = AVERROR_INVALIDDATA;

  265.             goto error;

  266.         }

  267. 

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

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

  270.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  272.                    cb, codebook_setup->dimensions);

  273.             ret = AVERROR_INVALIDDATA;

  274.             goto error;

  275.         }

  276.         entries = get_bits(gb, 24);

  277.         if (entries > V_MAX_VLCS) {

  278.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  280.                    cb, entries);

  281.             ret = AVERROR_INVALIDDATA;

  282.             goto error;

  283.         }

  284. 

  285.         ordered = get_bits1(gb);

  286. 

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

  288.                 codebook_setup->dimensions, entries);

  289. 

  290.         if (!ordered) {

  291.             unsigned ce, flag;

  292.             unsigned sparse = get_bits1(gb);

  293. 

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

  295. 

  296.             if (sparse) {

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

  298. 

  299.                 used_entries = 0;

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

  301.                     flag = get_bits1(gb);

  302.                     if (flag) {

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

  304.                         ++used_entries;

  305.                     } else

  306.                         tmp_vlc_bits[ce] = 0;

  307.                 }

  308.             } else {

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

  310. 

  311.                 used_entries = entries;

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

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

  314.             }

  315.         } else {

  316.             unsigned current_entry  = 0;

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

  318. 

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

  320. 

  321.             used_entries = entries;

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

  323.                 unsigned i, number;

  324. 

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

  326. 

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

  328. 

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

  330. 

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

  332.                     if (i < used_entries)

  333.                         tmp_vlc_bits[i] = current_length;

  334. 

  335.                 current_entry+=number;

  336.             }

  337.             if (current_entry>used_entries) {

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

  339.                 ret = AVERROR_INVALIDDATA;

  340.                 goto error;

  341.             }

  342.         }

  343. 

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

  345. 

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

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

  348. 

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

  350. 

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

  352.             unsigned i, j, k;

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

  354. 

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

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

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

  358.             unsigned codebook_sequence_p = get_bits1(gb);

  359. 

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

  361.                     codebook_lookup_values);

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

  363.                     codebook_delta_value, codebook_minimum_value);

  364. 

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

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

  367. 

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

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

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

  371.             }

  372. 

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

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

  375.                                                                     codebook_setup->dimensions *

  376.                                                                     sizeof(*codebook_setup->codevectors))

  377.                                                        : NULL;

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

  379.                 unsigned dim = codebook_setup->dimensions;

  380. 

  381.                 if (tmp_vlc_bits[i]) {

  382.                     float last = 0.0;

  383.                     unsigned lookup_offset = i;

  384. 

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

  386. 

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

  388.                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  390.                         if (codebook_sequence_p)

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

  392.                         lookup_offset/=codebook_lookup_values;

  393.                     }

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

  395. 

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

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

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

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

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

  401. 

  402.                     ++j;

  403.                 }

  404.             }

  405.             if (j != used_entries) {

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

  407.                 ret = AVERROR_INVALIDDATA;

  408.                 goto error;

  409.             }

  410.             entries = used_entries;

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

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

  413.             ret = AVERROR_INVALIDDATA;

  414.             goto error;

  415.         }

  416. 

  417. // Initialize VLC table

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

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

  420.             ret = AVERROR_INVALIDDATA;

  421.             goto error;

  422.         }

  423.         codebook_setup->maxdepth = 0;

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

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

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

  427. 

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

  429.             codebook_setup->nb_bits = V_NB_BITS2;

  430.         else

  431.             codebook_setup->nb_bits = V_NB_BITS;

  432. 

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

  434. 

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

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

  437.                             sizeof(*tmp_vlc_bits), tmp_vlc_codes,

  438.                             sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),

  439.                             INIT_VLC_LE))) {

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

  441.             goto error;

  442.         }

  443.     }

  444. 

  445.     av_free(tmp_vlc_bits);

  446.     av_free(tmp_vlc_codes);

  447.     av_free(codebook_multiplicands);

  448.     return 0;

  449. 

  450. // Error:

  451. error:

  452.     av_free(tmp_vlc_bits);

  453.     av_free(tmp_vlc_codes);

  454.     av_free(codebook_multiplicands);

  455.     return ret;

  456. }

  457. 

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

  459. 

  460. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  461. {

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

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

  464. 

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

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

  467. 

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

  469.                 vorbis_time_count, vorbis_tdtransform);

  470. 

  471.         if (vorbis_tdtransform) {

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

  473.             return AVERROR_INVALIDDATA;

  474.         }

  475.     }

  476.     return 0;

  477. }

  478. 

  479. // Process floors part

  480. 

  481. static int vorbis_floor0_decode(vorbis_context *vc,

  482.                                 vorbis_floor_data *vfu, float *vec);

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

  484. static int vorbis_floor1_decode(vorbis_context *vc,

  485.                                 vorbis_floor_data *vfu, float *vec);

  486. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  487. {

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

  489.     int i,j,k;

  490. 

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

  492. 

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

  494. 

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

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

  497. 

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

  499. 

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

  501. 

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

  503.             int maximum_class = -1;

  504.             unsigned rangebits, rangemax, floor1_values = 2;

  505. 

  506.             floor_setup->decode = vorbis_floor1_decode;

  507. 

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

  509. 

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

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

  512. 

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

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

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

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

  517. 

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

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

  520. 

  521.             }

  522. 

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

  524. 

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

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

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

  528. 

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

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

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

  532. 

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

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

  535. 

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

  537.                 }

  538. 

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

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

  541.                     if (bits != -1)

  542.                         VALIDATE_INDEX(bits, vc->codebook_count)

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

  544. 

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

  546.                 }

  547.             }

  548. 

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

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

  551. 

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

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

  554. 

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

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

  557. 

  558. 

  559.             rangebits = get_bits(gb, 4);

  560.             rangemax = (1 << rangebits);

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

  562.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

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

  565.                 return AVERROR_INVALIDDATA;

  566.             }

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

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

  569. 

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

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

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

  573. 

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

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

  576.                 }

  577.             }

  578. 

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

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

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

  582.             unsigned max_codebook_dim = 0;

  583. 

  584.             floor_setup->decode = vorbis_floor0_decode;

  585. 

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

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

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

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

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

  591.              * 2^0 - 1 == 0                             */

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

  593.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

  595.                 return AVERROR_INVALIDDATA;

  596.             }

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

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

  599. 

  600.             /* allocate mem for booklist */

  601.             floor_setup->data.t0.book_list =

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

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

  604.                 return AVERROR(ENOMEM);

  605.             /* read book indexes */

  606.             {

  607.                 int idx;

  608.                 unsigned book_idx;

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

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

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

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

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

  614.                 }

  615.             }

  616. 

  617.             create_map(vc, i);

  618. 

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

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

  621.             floor_setup->data.t0.lsp =

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

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

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

  625.                 return AVERROR(ENOMEM);

  626. 

  627.             /* debug output parsed headers */

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

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

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

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

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

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

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

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

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

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

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

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

  640.             {

  641.                 int idx;

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

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

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

  645.                 }

  646.             }

  647.         } else {

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

  649.             return AVERROR_INVALIDDATA;

  650.         }

  651.     }

  652.     return 0;

  653. }

  654. 

  655. // Process residues part

  656. 

  657. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  658. {

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

  660.     unsigned i, j, k;

  661. 

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

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

  664. 

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

  666. 

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

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

  669.         uint8_t cascade[64];

  670.         unsigned high_bits, low_bits;

  671. 

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

  673. 

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

  675. 

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

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

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

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

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

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

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

  683.             av_log(vc->avccontext, AV_LOG_ERROR,

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

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

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

  687.             return AVERROR_INVALIDDATA;

  688.         }

  689. 

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

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

  692. 

  693.         res_setup->ptns_to_read =

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

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

  696.                                         vc->audio_channels *

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

  698.         if (!res_setup->classifs)

  699.             return AVERROR(ENOMEM);

  700. 

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

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

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

  704. 

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

  706.             high_bits = 0;

  707.             low_bits  = get_bits(gb, 3);

  708.             if (get_bits1(gb))

  709.                 high_bits = get_bits(gb, 5);

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

  711. 

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

  713.         }

  714. 

  715.         res_setup->maxpass = 0;

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

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

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

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

  720. 

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

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

  723. 

  724.                     if (k>res_setup->maxpass)

  725.                         res_setup->maxpass = k;

  726.                 } else {

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

  728.                 }

  729.             }

  730.         }

  731.     }

  732.     return 0;

  733. }

  734. 

  735. // Process mappings part

  736. 

  737. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  738. {

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

  740.     unsigned i, j;

  741. 

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

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

  744. 

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

  746. 

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

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

  749. 

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

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

  752.             return AVERROR_INVALIDDATA;

  753.         }

  754.         if (get_bits1(gb)) {

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

  756.         } else {

  757.             mapping_setup->submaps = 1;

  758.         }

  759. 

  760.         if (get_bits1(gb)) {

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

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

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

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

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

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

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

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

  769.             }

  770.         } else {

  771.             mapping_setup->coupling_steps = 0;

  772.         }

  773. 

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

  775.                 i, mapping_setup->coupling_steps);

  776. 

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

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

  779.             return AVERROR_INVALIDDATA; // following spec.

  780.         }

  781. 

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

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

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

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

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

  787.         }

  788. 

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

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

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

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

  793. 

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

  795.                     mapping_setup->submap_floor[j],

  796.                     mapping_setup->submap_residue[j]);

  797.         }

  798.     }

  799.     return 0;

  800. }

  801. 

  802. // Process modes part

  803. 

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

  805. {

  806.     vorbis_floor *floors = vc->floors;

  807.     vorbis_floor0 *vf;

  808.     int idx;

  809.     int blockflag, n;

  810.     int32_t *map;

  811. 

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

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

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

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

  816. 

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

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

  819. 

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

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

  822.                              ((vf->bark_map_size) /

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

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

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

  826.         }

  827.         map[n] = -1;

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

  829.     }

  830. 

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

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

  833.     }

  834. }

  835. 

  836. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  837. {

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

  839.     unsigned i;

  840. 

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

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

  843. 

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

  845. 

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

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

  848. 

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

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

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

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

  853. 

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

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

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

  857.     }

  858.     return 0;

  859. }

  860. 

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

  862. 

  863. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  864. {

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

  866.     int ret;

  867. 

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

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

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

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

  872.         return AVERROR_INVALIDDATA;

  873.     }

  874. 

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

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

  877.         return ret;

  878.     }

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

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

  881.         return ret;

  882.     }

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

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

  885.         return ret;

  886.     }

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

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

  889.         return ret;

  890.     }

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

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

  893.         return ret;

  894.     }

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

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

  897.         return ret;

  898.     }

  899.     if (!get_bits1(gb)) {

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

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

  902.     }

  903. 

  904.     return 0;

  905. }

  906. 

  907. // Process the identification header

  908. 

  909. static int vorbis_parse_id_hdr(vorbis_context *vc)

  910. {

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

  912.     unsigned bl0, bl1;

  913. 

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

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

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

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

  918.         return AVERROR_INVALIDDATA;

  919.     }

  920. 

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

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

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

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

  925.         return AVERROR_INVALIDDATA;

  926.     }

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

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

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

  930.         return AVERROR_INVALIDDATA;

  931.     }

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

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

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

  935.     bl0 = get_bits(gb, 4);

  936.     bl1 = get_bits(gb, 4);

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

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

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

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

  941.         return AVERROR_INVALIDDATA;

  942.     }

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

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

  945. 

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

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

  948.         return AVERROR_INVALIDDATA;

  949.     }

  950. 

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

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

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

  954.     vc->previous_window  = 0;

  955. 

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

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

  958. 

  959.     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 ",

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

  961. 

  962. /*

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

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

  965.         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)));

  966.     }

  967. */

  968. 

  969.     return 0;

  970. }

  971. 

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

  973. 

  974. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  975. {

  976.     vorbis_context *vc = avccontext->priv_data;

  977.     uint8_t *headers   = avccontext->extradata;

  978.     int headers_len    = avccontext->extradata_size;

  979.     uint8_t *header_start[3];

  980.     int header_len[3];

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

  982.     int hdr_type, ret;

  983. 

  984.     vc->avccontext = avccontext;

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

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

  987. 

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

  989.         avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;

  990.         vc->scale_bias = 1.0f;

  991.     } else {

  992.         avccontext->sample_fmt = AV_SAMPLE_FMT_S16;

  993.         vc->scale_bias = 32768.0f;

  994.     }

  995. 

  996.     if (!headers_len) {

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

  998.         return AVERROR_INVALIDDATA;

  999.     }

  1000. 

  1001.     if ((ret = avpriv_split_xiph_headers(headers, headers_len, 30, header_start, header_len)) < 0) {

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

  1003.         return ret;

  1004.     }

  1005. 

  1006.     init_get_bits(gb, header_start[0], header_len[0]*8);

  1007.     hdr_type = get_bits(gb, 8);

  1008.     if (hdr_type != 1) {

  1009.         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");

  1010.         return AVERROR_INVALIDDATA;

  1011.     }

  1012.     if ((ret = vorbis_parse_id_hdr(vc))) {

  1013.         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");

  1014.         vorbis_free(vc);

  1015.         return ret;

  1016.     }

  1017. 

  1018.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1019.     hdr_type = get_bits(gb, 8);

  1020.     if (hdr_type != 5) {

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

  1022.         vorbis_free(vc);

  1023.         return AVERROR_INVALIDDATA;

  1024.     }

  1025.     if ((ret = vorbis_parse_setup_hdr(vc))) {

  1026.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1027.         vorbis_free(vc);

  1028.         return ret;

  1029.     }

  1030. 

  1031.     if (vc->audio_channels > 8)

  1032.         avccontext->channel_layout = 0;

  1033.     else

  1034.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1035. 

  1036.     avccontext->channels    = vc->audio_channels;

  1037.     avccontext->sample_rate = vc->audio_samplerate;

  1038.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;

  1039. 

  1040.     return 0;

  1041. }

  1042. 

  1043. // Decode audiopackets -------------------------------------------------

  1044. 

  1045. // Read and decode floor

  1046. 

  1047. static int vorbis_floor0_decode(vorbis_context *vc,

  1048.                                 vorbis_floor_data *vfu, float *vec)

  1049. {

  1050.     vorbis_floor0 *vf = &vfu->t0;

  1051.     float *lsp = vf->lsp;

  1052.     unsigned amplitude, book_idx;

  1053.     unsigned blockflag = vc->modes[vc->mode_number].blockflag;

  1054. 

  1055.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1056.     if (amplitude > 0) {

  1057.         float last = 0;

  1058.         unsigned idx, lsp_len = 0;

  1059.         vorbis_codebook codebook;

  1060. 

  1061.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1062.         if (book_idx >= vf->num_books) {

  1063.             av_log(vc->avccontext, AV_LOG_ERROR,

  1064.                     "floor0 dec: booknumber too high!\n");

  1065.             book_idx =  0;

  1066.         }

  1067.         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);

  1068.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1069.         /* Invalid codebook! */

  1070.         if (!codebook.codevectors)

  1071.             return AVERROR_INVALIDDATA;

  1072. 

  1073.         while (lsp_len<vf->order) {

  1074.             int vec_off;

  1075. 

  1076.             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);

  1077.             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1078.             /* read temp vector */

  1079.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1080.                                codebook.nb_bits, codebook.maxdepth)

  1081.                       * codebook.dimensions;

  1082.             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);

  1083.             /* copy each vector component and add last to it */

  1084.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1085.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1086.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1087. 

  1088.             lsp_len += codebook.dimensions;

  1089.         }

  1090.         /* DEBUG: output lsp coeffs */

  1091.         {

  1092.             int idx;

  1093.             for (idx = 0; idx < lsp_len; ++idx)

  1094.                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1095.         }

  1096. 

  1097.         /* synthesize floor output vector */

  1098.         {

  1099.             int i;

  1100.             int order = vf->order;

  1101.             float wstep = M_PI / vf->bark_map_size;

  1102. 

  1103.             for (i = 0; i < order; i++)

  1104.                 lsp[i] = 2.0f * cos(lsp[i]);

  1105. 

  1106.             av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",

  1107.                     vf->map_size[blockflag], order, wstep);

  1108. 

  1109.             i = 0;

  1110.             while (i < vf->map_size[blockflag]) {

  1111.                 int j, iter_cond = vf->map[blockflag][i];

  1112.                 float p = 0.5f;

  1113.                 float q = 0.5f;

  1114.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1115. 

  1116.                 /* similar part for the q and p products */

  1117.                 for (j = 0; j + 1 < order; j += 2) {

  1118.                     q *= lsp[j]     - two_cos_w;

  1119.                     p *= lsp[j + 1] - two_cos_w;

  1120.                 }

  1121.                 if (j == order) { // even order

  1122.                     p *= p * (2.0f - two_cos_w);

  1123.                     q *= q * (2.0f + two_cos_w);

  1124.                 } else { // odd order

  1125.                     q *= two_cos_w-lsp[j]; // one more time for q

  1126. 

  1127.                     /* final step and square */

  1128.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1129.                     q *= q;

  1130.                 }

  1131. 

  1132.                 /* calculate linear floor value */

  1133.                 q = exp((((amplitude*vf->amplitude_offset) /

  1134.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1135.                          - vf->amplitude_offset) * .11512925f);

  1136. 

  1137.                 /* fill vector */

  1138.                 do {

  1139.                     vec[i] = q; ++i;

  1140.                 } while (vf->map[blockflag][i] == iter_cond);

  1141.             }

  1142.         }

  1143.     } else {

  1144.         /* this channel is unused */

  1145.         return 1;

  1146.     }

  1147. 

  1148.     av_dlog(NULL, " Floor0 decoded\n");

  1149. 

  1150.     return 0;

  1151. }

  1152. 

  1153. static int vorbis_floor1_decode(vorbis_context *vc,

  1154.                                 vorbis_floor_data *vfu, float *vec)

  1155. {

  1156.     vorbis_floor1 *vf = &vfu->t1;

  1157.     GetBitContext *gb = &vc->gb;

  1158.     uint16_t range_v[4] = { 256, 128, 86, 64 };

  1159.     unsigned range = range_v[vf->multiplier - 1];

  1160.     uint16_t floor1_Y[258];

  1161.     uint16_t floor1_Y_final[258];

  1162.     int floor1_flag[258];

  1163.     unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;

  1164.     int book, adx, ady, dy, off, predicted, err;

  1165. 

  1166. 

  1167.     if (!get_bits1(gb)) // silence

  1168.         return 1;

  1169. 

  1170. // Read values (or differences) for the floor's points

  1171. 

  1172.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1173.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1174. 

  1175.     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1176. 

  1177.     offset = 2;

  1178.     for (i = 0; i < vf->partitions; ++i) {

  1179.         partition_class = vf->partition_class[i];

  1180.         cdim   = vf->class_dimensions[partition_class];

  1181.         cbits  = vf->class_subclasses[partition_class];

  1182.         csub = (1 << cbits) - 1;

  1183.         cval = 0;

  1184. 

  1185.         av_dlog(NULL, "Cbits %u\n", cbits);

  1186. 

  1187.         if (cbits) // this reads all subclasses for this partition's class

  1188.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,

  1189.                             vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);

  1190. 

  1191.         for (j = 0; j < cdim; ++j) {

  1192.             book = vf->subclass_books[partition_class][cval & csub];

  1193. 

  1194.             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",

  1195.                     book, cbits, cval, get_bits_count(gb));

  1196. 

  1197.             cval = cval >> cbits;

  1198.             if (book > -1) {

  1199.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1200.                 vc->codebooks[book].nb_bits, 3);

  1201.             } else {

  1202.                 floor1_Y[offset+j] = 0;

  1203.             }

  1204. 

  1205.             av_dlog(NULL, " floor(%d) = %d \n",

  1206.                     vf->list[offset+j].x, floor1_Y[offset+j]);

  1207.         }

  1208.         offset+=cdim;

  1209.     }

  1210. 

  1211. // Amplitude calculation from the differences

  1212. 

  1213.     floor1_flag[0] = 1;

  1214.     floor1_flag[1] = 1;

  1215.     floor1_Y_final[0] = floor1_Y[0];

  1216.     floor1_Y_final[1] = floor1_Y[1];

  1217. 

  1218.     for (i = 2; i < vf->x_list_dim; ++i) {

  1219.         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;

  1220. 

  1221.         low_neigh_offs  = vf->list[i].low;

  1222.         high_neigh_offs = vf->list[i].high;

  1223.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1224.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1225.         ady = FFABS(dy);

  1226.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1227.         off = err / adx;

  1228.         if (dy < 0) {

  1229.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1230.         } else {

  1231.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1232.         } // render_point end

  1233. 

  1234.         val = floor1_Y[i];

  1235.         highroom = range-predicted;

  1236.         lowroom  = predicted;

  1237.         if (highroom < lowroom) {

  1238.             room = highroom * 2;

  1239.         } else {

  1240.             room = lowroom * 2;   // SPEC mispelling

  1241.         }

  1242.         if (val) {

  1243.             floor1_flag[low_neigh_offs]  = 1;

  1244.             floor1_flag[high_neigh_offs] = 1;

  1245.             floor1_flag[i]               = 1;

  1246.             if (val >= room) {

  1247.                 if (highroom > lowroom) {

  1248.                     floor1_Y_final[i] = val - lowroom + predicted;

  1249.                 } else {

  1250.                     floor1_Y_final[i] = predicted - val + highroom - 1;

  1251.                 }

  1252.             } else {

  1253.                 if (val & 1) {

  1254.                     floor1_Y_final[i] = predicted - (val + 1) / 2;

  1255.                 } else {

  1256.                     floor1_Y_final[i] = predicted + val / 2;

  1257.                 }

  1258.             }

  1259.         } else {

  1260.             floor1_flag[i]    = 0;

  1261.             floor1_Y_final[i] = predicted;

  1262.         }

  1263. 

  1264.         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",

  1265.                 vf->list[i].x, floor1_Y_final[i], val);

  1266.     }

  1267. 

  1268. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1269. 

  1270.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1271. 

  1272.     av_dlog(NULL, " Floor decoded\n");

  1273. 

  1274.     return 0;

  1275. }

  1276. 

  1277. // Read and decode residue

  1278. 

  1279. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1280.                                                            vorbis_residue *vr,

  1281.                                                            unsigned ch,

  1282.                                                            uint8_t *do_not_decode,

  1283.                                                            float *vec,

  1284.                                                            unsigned vlen,

  1285.                                                            int vr_type)

  1286. {

  1287.     GetBitContext *gb = &vc->gb;

  1288.     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;

  1289.     unsigned ptns_to_read = vr->ptns_to_read;

  1290.     uint8_t *classifs = vr->classifs;

  1291.     unsigned pass, ch_used, i, j, k, l;

  1292. 

  1293.     if (vr_type == 2) {

  1294.         for (j = 1; j < ch; ++j)

  1295.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1296.         if (do_not_decode[0])

  1297.             return 0;

  1298.         ch_used = 1;

  1299.     } else {

  1300.         ch_used = ch;

  1301.     }

  1302. 

  1303.     av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1304. 

  1305.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1306.         uint16_t voffset, partition_count, j_times_ptns_to_read;

  1307. 

  1308.         voffset = vr->begin;

  1309.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1310.             if (!pass) {

  1311.                 unsigned inverse_class = ff_inverse[vr->classifications];

  1312.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1313.                     if (!do_not_decode[j]) {

  1314.                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1315.                                                  vc->codebooks[vr->classbook].nb_bits, 3);

  1316. 

  1317.                         av_dlog(NULL, "Classword: %u\n", temp);

  1318. 

  1319.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1320.                         for (i = 0; i < c_p_c; ++i) {

  1321.                             unsigned temp2;

  1322. 

  1323.                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;

  1324.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1325.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1326.                             temp = temp2;

  1327.                         }

  1328.                     }

  1329.                     j_times_ptns_to_read += ptns_to_read;

  1330.                 }

  1331.             }

  1332.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1333.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1334.                     unsigned voffs;

  1335. 

  1336.                     if (!do_not_decode[j]) {

  1337.                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];

  1338.                         int vqbook  = vr->books[vqclass][pass];

  1339. 

  1340.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1341.                             unsigned coffs;

  1342.                             unsigned dim  = vc->codebooks[vqbook].dimensions;

  1343.                             unsigned step = dim == 1 ? vr->partition_size

  1344.                                                      : FASTDIV(vr->partition_size, dim);

  1345.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1346. 

  1347.                             if (vr_type == 0) {

  1348. 

  1349.                                 voffs = voffset+j*vlen;

  1350.                                 for (k = 0; k < step; ++k) {

  1351.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1352.                                     for (l = 0; l < dim; ++l)

  1353.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH

  1354.                                 }

  1355.                             } else if (vr_type == 1) {

  1356.                                 voffs = voffset + j * vlen;

  1357.                                 for (k = 0; k < step; ++k) {

  1358.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1359.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1360.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1361. 

  1362.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d  \n",

  1363.                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1364.                                     }

  1365.                                 }

  1366.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1367.                                 voffs = voffset >> 1;

  1368. 

  1369.                                 if (dim == 2) {

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

  1371.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

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

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

  1374.                                     }

  1375.                                 } else if (dim == 4) {

  1376.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1377.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

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

  1379.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH

  1380.                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];  // FPMATH

  1381.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH

  1382.                                     }

  1383.                                 } else

  1384.                                 for (k = 0; k < step; ++k) {

  1385.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1386.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1387.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];  // FPMATH

  1388.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];  // FPMATH

  1389. 

  1390.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1391.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1392.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1393.                                                 codebook.codevectors[coffs + l], coffs, l);

  1394.                                     }

  1395.                                 }

  1396. 

  1397.                             } else if (vr_type == 2) {

  1398.                                 voffs = voffset;

  1399. 

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

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

  1402.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1403.                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %

  1404. 

  1405.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1406.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1407.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1408.                                                 codebook.codevectors[coffs + l], coffs, l);

  1409.                                     }

  1410.                                 }

  1411.                             }

  1412.                         }

  1413.                     }

  1414.                     j_times_ptns_to_read += ptns_to_read;

  1415.                 }

  1416.                 ++partition_count;

  1417.                 voffset += vr->partition_size;

  1418.             }

  1419.         }

  1420.     }

  1421.     return 0;

  1422. }

  1423. 

  1424. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1425.                                         unsigned ch,

  1426.                                         uint8_t *do_not_decode,

  1427.                                         float *vec, unsigned vlen)

  1428. {

  1429.     if (vr->type == 2)

  1430.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1431.     else if (vr->type == 1)

  1432.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1433.     else if (vr->type == 0)

  1434.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1435.     else {

  1436.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1437.         return AVERROR_INVALIDDATA;

  1438.     }

  1439. }

  1440. 

  1441. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1442. {

  1443.     int i;

  1444.     for (i = 0;  i < blocksize;  i++) {

  1445.         if (mag[i] > 0.0) {

  1446.             if (ang[i] > 0.0) {

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

  1448.             } else {

  1449.                 float temp = ang[i];

  1450.                 ang[i]     = mag[i];

  1451.                 mag[i]    += temp;

  1452.             }

  1453.         } else {

  1454.             if (ang[i] > 0.0) {

  1455.                 ang[i] += mag[i];

  1456.             } else {

  1457.                 float temp = ang[i];

  1458.                 ang[i]     = mag[i];

  1459.                 mag[i]    -= temp;

  1460.             }

  1461.         }

  1462.     }

  1463. }

  1464. 

  1465. // Decode the audio packet using the functions above

  1466. 

  1467. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1468. {

  1469.     GetBitContext *gb = &vc->gb;

  1470.     FFTContext *mdct;

  1471.     unsigned previous_window = vc->previous_window;

  1472.     unsigned mode_number, blockflag, blocksize;

  1473.     int i, j;

  1474.     uint8_t no_residue[255];

  1475.     uint8_t do_not_decode[255];

  1476.     vorbis_mapping *mapping;

  1477.     float *ch_res_ptr   = vc->channel_residues;

  1478.     float *ch_floor_ptr = vc->channel_floors;

  1479.     uint8_t res_chan[255];

  1480.     unsigned res_num = 0;

  1481.     int retlen  = 0;

  1482. 

  1483.     if (get_bits1(gb)) {

  1484.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1485.         return AVERROR_INVALIDDATA; // packet type not audio

  1486.     }

  1487. 

  1488.     if (vc->mode_count == 1) {

  1489.         mode_number = 0;

  1490.     } else {

  1491.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1492.     }

  1493.     vc->mode_number = mode_number;

  1494.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1495. 

  1496.     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,

  1497.             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1498. 

  1499.     blockflag = vc->modes[mode_number].blockflag;

  1500.     blocksize = vc->blocksize[blockflag];

  1501.     if (blockflag)

  1502.         skip_bits(gb, 2); // previous_window, next_window

  1503. 

  1504.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1505.     memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1506. 

  1507. // Decode floor

  1508. 

  1509.     for (i = 0; i < vc->audio_channels; ++i) {

  1510.         vorbis_floor *floor;

  1511.         int ret;

  1512.         if (mapping->submaps > 1) {

  1513.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1514.         } else {

  1515.             floor = &vc->floors[mapping->submap_floor[0]];

  1516.         }

  1517. 

  1518.         ret = floor->decode(vc, &floor->data, ch_floor_ptr);

  1519. 

  1520.         if (ret < 0) {

  1521.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1522.             return AVERROR_INVALIDDATA;

  1523.         }

  1524.         no_residue[i] = ret;

  1525.         ch_floor_ptr += blocksize / 2;

  1526.     }

  1527. 

  1528. // Nonzero vector propagate

  1529. 

  1530.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1531.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1532.             no_residue[mapping->magnitude[i]] = 0;

  1533.             no_residue[mapping->angle[i]]     = 0;

  1534.         }

  1535.     }

  1536. 

  1537. // Decode residue

  1538. 

  1539.     for (i = 0; i < mapping->submaps; ++i) {

  1540.         vorbis_residue *residue;

  1541.         unsigned ch = 0;

  1542. 

  1543.         for (j = 0; j < vc->audio_channels; ++j) {

  1544.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1545.                 res_chan[j] = res_num;

  1546.                 if (no_residue[j]) {

  1547.                     do_not_decode[ch] = 1;

  1548.                 } else {

  1549.                     do_not_decode[ch] = 0;

  1550.                 }

  1551.                 ++ch;

  1552.                 ++res_num;

  1553.             }

  1554.         }

  1555.         residue = &vc->residues[mapping->submap_residue[i]];

  1556.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1557. 

  1558.         ch_res_ptr += ch * blocksize / 2;

  1559.     }

  1560. 

  1561. // Inverse coupling

  1562. 

  1563.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1564.         float *mag, *ang;

  1565. 

  1566.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

  1567.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1568.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1569.     }

  1570. 

  1571. // Dotproduct, MDCT

  1572. 

  1573.     mdct = &vc->mdct[blockflag];

  1574. 

  1575.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1576.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;

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

  1578.         vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);

  1579.         mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);

  1580.     }

  1581. 

  1582. // Overlap/add, save data for next overlapping  FPMATH

  1583. 

  1584.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

  1585.     for (j = 0; j < vc->audio_channels; j++) {

  1586.         unsigned bs0 = vc->blocksize[0];

  1587.         unsigned bs1 = vc->blocksize[1];

  1588.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1589.         float *saved      = vc->saved + j * bs1 / 4;

  1590.         float *ret        = vc->channel_floors + j * retlen;

  1591.         float *buf        = residue;

  1592.         const float *win  = vc->win[blockflag & previous_window];

  1593. 

  1594.         if (blockflag == previous_window) {

  1595.             vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);

  1596.         } else if (blockflag > previous_window) {

  1597.             vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);

  1598.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1599.         } else {

  1600.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1601.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);

  1602.         }

  1603.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1604.     }

  1605. 

  1606.     vc->previous_window = blockflag;

  1607.     return retlen;

  1608. }

  1609. 

  1610. // Return the decoded audio packet through the standard api

  1611. 

  1612. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1613.                                void *data, int *data_size,

  1614.                                AVPacket *avpkt)

  1615. {

  1616.     const uint8_t *buf = avpkt->data;

  1617.     int buf_size       = avpkt->size;

  1618.     vorbis_context *vc = avccontext->priv_data;

  1619.     GetBitContext *gb = &(vc->gb);

  1620.     const float *channel_ptrs[255];

  1621.     int i, len, out_size;

  1622. 

  1623.     av_dlog(NULL, "packet length %d \n", buf_size);

  1624. 

  1625.     init_get_bits(gb, buf, buf_size*8);

  1626. 

  1627.     if ((len = vorbis_parse_audio_packet(vc)) <= 0)

  1628.         return len;

  1629. 

  1630.     if (!vc->first_frame) {

  1631.         vc->first_frame = 1;

  1632.         *data_size = 0;

  1633.         return buf_size;

  1634.     }

  1635. 

  1636.     av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",

  1637.             get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);

  1638. 

  1639.     out_size = len * vc->audio_channels *

  1640.                av_get_bytes_per_sample(avccontext->sample_fmt);

  1641.     if (*data_size < out_size) {

  1642.         av_log(avccontext, AV_LOG_ERROR, "output buffer is too small\n");

  1643.         return AVERROR(EINVAL);

  1644.     }

  1645. 

  1646.     if (vc->audio_channels > 8) {

  1647.         for (i = 0; i < vc->audio_channels; i++)

  1648.             channel_ptrs[i] = vc->channel_floors + i * len;

  1649.     } else {

  1650.         for (i = 0; i < vc->audio_channels; i++)

  1651.             channel_ptrs[i] = vc->channel_floors +

  1652.                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1653.     }

  1654. 

  1655.     if (avccontext->sample_fmt == AV_SAMPLE_FMT_FLT)

  1656.         vc->fmt_conv.float_interleave(data, channel_ptrs, len, vc->audio_channels);

  1657.     else

  1658.         vc->fmt_conv.float_to_int16_interleave(data, channel_ptrs, len,

  1659.                                                vc->audio_channels);

  1660. 

  1661.     *data_size = out_size;

  1662. 

  1663.     return buf_size;

  1664. }

  1665. 

  1666. // Close decoder

  1667. 

  1668. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1669. {

  1670.     vorbis_context *vc = avccontext->priv_data;

  1671. 

  1672.     vorbis_free(vc);

  1673. 

  1674.     return 0;

  1675. }

  1676. 

  1677. AVCodec ff_vorbis_decoder = {

  1678.     .name           = "vorbis",

  1679.     .type           = AVMEDIA_TYPE_AUDIO,

  1680.     .id             = CODEC_ID_VORBIS,

  1681.     .priv_data_size = sizeof(vorbis_context),

  1682.     .init           = vorbis_decode_init,

  1683.     .close          = vorbis_decode_close,

  1684.     .decode         = vorbis_decode_frame,

  1685.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1686.     .channel_layouts = ff_vorbis_channel_layouts,

  1687.     .sample_fmts = (const enum AVSampleFormat[]) {

  1688.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE

  1689.     },

  1690. };