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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 Libav.

  7.  *

  8.  * Libav 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.  * Libav 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 Libav; if not, write to the Free Software

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

  21.  */

  22. 

  23. #include <inttypes.h>

  24. #include <math.h>

  25. 

  26. #define ALT_BITSTREAM_READER_LE

  27. #include "avcodec.h"

  28. #include "get_bits.h"

  29. #include "dsputil.h"

  30. #include "fft.h"

  31. #include "fmtconvert.h"

  32. 

  33. #include "vorbis.h"

  34. #include "xiph.h"

  35. 

  36. #define V_NB_BITS 8

  37. #define V_NB_BITS2 11

  38. #define V_MAX_VLCS (1 << 16)

  39. #define V_MAX_PARTITIONS (1 << 20)

  40. 

  41. #undef NDEBUG

  42. #include <assert.h>

  43. 

  44. typedef struct {

  45.     uint8_t      dimensions;

  46.     uint8_t      lookup_type;

  47.     uint8_t      maxdepth;

  48.     VLC          vlc;

  49.     float       *codevectors;

  50.     unsigned int nb_bits;

  51. } vorbis_codebook;

  52. 

  53. typedef union  vorbis_floor_u  vorbis_floor_data;

  54. typedef struct vorbis_floor0_s vorbis_floor0;

  55. typedef struct vorbis_floor1_s vorbis_floor1;

  56. struct vorbis_context_s;

  57. typedef

  58. int (* vorbis_floor_decode_func)

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

  60. typedef struct {

  61.     uint8_t floor_type;

  62.     vorbis_floor_decode_func decode;

  63.     union vorbis_floor_u {

  64.         struct vorbis_floor0_s {

  65.             uint8_t       order;

  66.             uint16_t      rate;

  67.             uint16_t      bark_map_size;

  68.             int32_t      *map[2];

  69.             uint32_t      map_size[2];

  70.             uint8_t       amplitude_bits;

  71.             uint8_t       amplitude_offset;

  72.             uint8_t       num_books;

  73.             uint8_t      *book_list;

  74.             float        *lsp;

  75.         } t0;

  76.         struct vorbis_floor1_s {

  77.             uint8_t       partitions;

  78.             uint8_t       partition_class[32];

  79.             uint8_t       class_dimensions[16];

  80.             uint8_t       class_subclasses[16];

  81.             uint8_t       class_masterbook[16];

  82.             int16_t       subclass_books[16][8];

  83.             uint8_t       multiplier;

  84.             uint16_t      x_list_dim;

  85.             vorbis_floor1_entry *list;

  86.         } t1;

  87.     } data;

  88. } vorbis_floor;

  89. 

  90. typedef struct {

  91.     uint16_t      type;

  92.     uint32_t      begin;

  93.     uint32_t      end;

  94.     unsigned      partition_size;

  95.     uint8_t       classifications;

  96.     uint8_t       classbook;

  97.     int16_t       books[64][8];

  98.     uint8_t       maxpass;

  99.     uint16_t      ptns_to_read;

  100.     uint8_t      *classifs;

  101. } vorbis_residue;

  102. 

  103. typedef struct {

  104.     uint8_t       submaps;

  105.     uint16_t      coupling_steps;

  106.     uint8_t      *magnitude;

  107.     uint8_t      *angle;

  108.     uint8_t      *mux;

  109.     uint8_t       submap_floor[16];

  110.     uint8_t       submap_residue[16];

  111. } vorbis_mapping;

  112. 

  113. typedef struct {

  114.     uint8_t       blockflag;

  115.     uint16_t      windowtype;

  116.     uint16_t      transformtype;

  117.     uint8_t       mapping;

  118. } vorbis_mode;

  119. 

  120. typedef struct vorbis_context_s {

  121.     AVCodecContext *avccontext;

  122.     GetBitContext gb;

  123.     DSPContext dsp;

  124.     FmtConvertContext fmt_conv;

  125. 

  126.     FFTContext mdct[2];

  127.     uint8_t       first_frame;

  128.     uint32_t      version;

  129.     uint8_t       audio_channels;

  130.     uint32_t      audio_samplerate;

  131.     uint32_t      bitrate_maximum;

  132.     uint32_t      bitrate_nominal;

  133.     uint32_t      bitrate_minimum;

  134.     uint32_t      blocksize[2];

  135.     const float  *win[2];

  136.     uint16_t      codebook_count;

  137.     vorbis_codebook *codebooks;

  138.     uint8_t       floor_count;

  139.     vorbis_floor *floors;

  140.     uint8_t       residue_count;

  141.     vorbis_residue *residues;

  142.     uint8_t       mapping_count;

  143.     vorbis_mapping *mappings;

  144.     uint8_t       mode_count;

  145.     vorbis_mode  *modes;

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

  147.     uint8_t       previous_window;

  148.     float        *channel_residues;

  149.     float        *channel_floors;

  150.     float        *saved;

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

  152. } vorbis_context;

  153. 

  154. /* Helper functions */

  155. 

  156. #define BARK(x) \

  157.     (13.1f * atan(0.00074f * (x)) + 2.24f * atan(1.85e-8f * (x) * (x)) + 1e-4f * (x))

  158. 

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

  160. #define VALIDATE_INDEX(idx, limit) \

  161.     if (idx >= limit) {\

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

  163.                idx_err_str,\

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

  165.         return -1;\

  166.     }

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

  168.     {\

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

  170.         VALIDATE_INDEX(idx, limit)\

  171.     }

  172. 

  173. static float vorbisfloat2float(unsigned val)

  174. {

  175.     double mant = val & 0x1fffff;

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

  177.     if (val & 0x80000000)

  178.         mant = -mant;

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

  180. }

  181. 

  182. 

  183. // Free all allocated memory -----------------------------------------

  184. 

  185. static void vorbis_free(vorbis_context *vc)

  186. {

  187.     int i;

  188. 

  189.     av_freep(&vc->channel_residues);

  190.     av_freep(&vc->channel_floors);

  191.     av_freep(&vc->saved);

  192. 

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

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

  195.     av_freep(&vc->residues);

  196.     av_freep(&vc->modes);

  197. 

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

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

  200. 

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

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

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

  204.     }

  205.     av_freep(&vc->codebooks);

  206. 

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

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

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

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

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

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

  213.         } else {

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

  215.         }

  216.     }

  217.     av_freep(&vc->floors);

  218. 

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

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

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

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

  223.     }

  224.     av_freep(&vc->mappings);

  225. }

  226. 

  227. // Parse setup header -------------------------------------------------

  228. 

  229. // Process codebooks part

  230. 

  231. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  232. {

  233.     unsigned cb;

  234.     uint8_t  *tmp_vlc_bits;

  235.     uint32_t *tmp_vlc_codes;

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

  237.     uint16_t *codebook_multiplicands;

  238. 

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

  240. 

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

  242. 

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

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

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

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

  247. 

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

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

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

  251. 

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

  253. 

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

  255.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  257.             goto error;

  258.         }

  259. 

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

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

  262.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  264.                    cb, codebook_setup->dimensions);

  265.             goto error;

  266.         }

  267.         entries = get_bits(gb, 24);

  268.         if (entries > V_MAX_VLCS) {

  269.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  271.                    cb, entries);

  272.             goto error;

  273.         }

  274. 

  275.         ordered = get_bits1(gb);

  276. 

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

  278.                 codebook_setup->dimensions, entries);

  279. 

  280.         if (!ordered) {

  281.             unsigned ce, flag;

  282.             unsigned sparse = get_bits1(gb);

  283. 

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

  285. 

  286.             if (sparse) {

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

  288. 

  289.                 used_entries = 0;

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

  291.                     flag = get_bits1(gb);

  292.                     if (flag) {

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

  294.                         ++used_entries;

  295.                     } else

  296.                         tmp_vlc_bits[ce] = 0;

  297.                 }

  298.             } else {

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

  300. 

  301.                 used_entries = entries;

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

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

  304.             }

  305.         } else {

  306.             unsigned current_entry  = 0;

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

  308. 

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

  310. 

  311.             used_entries = entries;

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

  313.                 unsigned i, number;

  314. 

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

  316. 

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

  318. 

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

  320. 

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

  322.                     if (i < used_entries)

  323.                         tmp_vlc_bits[i] = current_length;

  324. 

  325.                 current_entry+=number;

  326.             }

  327.             if (current_entry>used_entries) {

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

  329.                 goto error;

  330.             }

  331.         }

  332. 

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

  334. 

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

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

  337. 

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

  339. 

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

  341.             unsigned i, j, k;

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

  343. 

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

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

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

  347.             unsigned codebook_sequence_p = get_bits1(gb);

  348. 

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

  350.                     codebook_lookup_values);

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

  352.                     codebook_delta_value, codebook_minimum_value);

  353. 

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

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

  356. 

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

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

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

  360.             }

  361. 

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

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

  364.                                                                     codebook_setup->dimensions *

  365.                                                                     sizeof(*codebook_setup->codevectors))

  366.                                                        : NULL;

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

  368.                 unsigned dim = codebook_setup->dimensions;

  369. 

  370.                 if (tmp_vlc_bits[i]) {

  371.                     float last = 0.0;

  372.                     unsigned lookup_offset = i;

  373. 

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

  375. 

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

  377.                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  379.                         if (codebook_sequence_p)

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

  381.                         lookup_offset/=codebook_lookup_values;

  382.                     }

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

  384. 

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

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

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

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

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

  390. 

  391.                     ++j;

  392.                 }

  393.             }

  394.             if (j != used_entries) {

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

  396.                 goto error;

  397.             }

  398.             entries = used_entries;

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

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

  401.             goto error;

  402.         }

  403. 

  404. // Initialize VLC table

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

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

  407.             goto error;

  408.         }

  409.         codebook_setup->maxdepth = 0;

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

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

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

  413. 

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

  415.             codebook_setup->nb_bits = V_NB_BITS2;

  416.         else

  417.             codebook_setup->nb_bits = V_NB_BITS;

  418. 

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

  420. 

  421.         if (init_vlc(&codebook_setup->vlc, codebook_setup->nb_bits, entries, tmp_vlc_bits, sizeof(*tmp_vlc_bits), sizeof(*tmp_vlc_bits), tmp_vlc_codes, sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes), INIT_VLC_LE)) {

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

  423.             goto error;

  424.         }

  425.     }

  426. 

  427.     av_free(tmp_vlc_bits);

  428.     av_free(tmp_vlc_codes);

  429.     av_free(codebook_multiplicands);

  430.     return 0;

  431. 

  432. // Error:

  433. error:

  434.     av_free(tmp_vlc_bits);

  435.     av_free(tmp_vlc_codes);

  436.     av_free(codebook_multiplicands);

  437.     return -1;

  438. }

  439. 

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

  441. 

  442. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  443. {

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

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

  446. 

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

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

  449. 

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

  451.                 vorbis_time_count, vorbis_tdtransform);

  452. 

  453.         if (vorbis_tdtransform) {

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

  455.             return -1;

  456.         }

  457.     }

  458.     return 0;

  459. }

  460. 

  461. // Process floors part

  462. 

  463. static int vorbis_floor0_decode(vorbis_context *vc,

  464.                                 vorbis_floor_data *vfu, float *vec);

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

  466. static int vorbis_floor1_decode(vorbis_context *vc,

  467.                                 vorbis_floor_data *vfu, float *vec);

  468. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  469. {

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

  471.     int i,j,k;

  472. 

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

  474. 

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

  476. 

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

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

  479. 

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

  481. 

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

  483. 

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

  485.             int maximum_class = -1;

  486.             unsigned rangebits, rangemax, floor1_values = 2;

  487. 

  488.             floor_setup->decode = vorbis_floor1_decode;

  489. 

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

  491. 

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

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

  494. 

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

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

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

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

  499. 

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

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

  502. 

  503.             }

  504. 

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

  506. 

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

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

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

  510. 

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

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

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

  514. 

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

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

  517. 

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

  519.                 }

  520. 

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

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

  523.                     if (bits != -1)

  524.                         VALIDATE_INDEX(bits, vc->codebook_count)

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

  526. 

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

  528.                 }

  529.             }

  530. 

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

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

  533. 

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

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

  536. 

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

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

  539. 

  540. 

  541.             rangebits = get_bits(gb, 4);

  542.             rangemax = (1 << rangebits);

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

  544.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

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

  547.                 return -1;

  548.             }

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

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

  551. 

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

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

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

  555. 

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

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

  558.                 }

  559.             }

  560. 

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

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

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

  564.             unsigned max_codebook_dim = 0;

  565. 

  566.             floor_setup->decode = vorbis_floor0_decode;

  567. 

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

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

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

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

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

  573.              * 2^0 - 1 == 0                             */

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

  575.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

  577.                 return -1;

  578.             }

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

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

  581. 

  582.             /* allocate mem for booklist */

  583.             floor_setup->data.t0.book_list =

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

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

  586.                 return -1;

  587.             /* read book indexes */

  588.             {

  589.                 int idx;

  590.                 unsigned book_idx;

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

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

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

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

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

  596.                 }

  597.             }

  598. 

  599.             create_map(vc, i);

  600. 

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

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

  603.             floor_setup->data.t0.lsp =

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

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

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

  607.                 return -1;

  608. 

  609.             /* debug output parsed headers */

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

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

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

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

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

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

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

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

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

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

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

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

  622.             {

  623.                 int idx;

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

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

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

  627.                 }

  628.             }

  629.         } else {

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

  631.             return -1;

  632.         }

  633.     }

  634.     return 0;

  635. }

  636. 

  637. // Process residues part

  638. 

  639. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  640. {

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

  642.     unsigned i, j, k;

  643. 

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

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

  646. 

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

  648. 

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

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

  651.         uint8_t cascade[64];

  652.         unsigned high_bits, low_bits;

  653. 

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

  655. 

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

  657. 

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

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

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

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

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

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

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

  665.             av_log(vc->avccontext, AV_LOG_ERROR,

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

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

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

  669.             return -1;

  670.         }

  671. 

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

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

  674. 

  675.         res_setup->ptns_to_read =

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

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

  678.                                         vc->audio_channels *

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

  680.         if (!res_setup->classifs)

  681.             return AVERROR(ENOMEM);

  682. 

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

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

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

  686. 

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

  688.             high_bits = 0;

  689.             low_bits  = get_bits(gb, 3);

  690.             if (get_bits1(gb))

  691.                 high_bits = get_bits(gb, 5);

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

  693. 

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

  695.         }

  696. 

  697.         res_setup->maxpass = 0;

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

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

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

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

  702. 

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

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

  705. 

  706.                     if (k>res_setup->maxpass)

  707.                         res_setup->maxpass = k;

  708.                 } else {

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

  710.                 }

  711.             }

  712.         }

  713.     }

  714.     return 0;

  715. }

  716. 

  717. // Process mappings part

  718. 

  719. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  720. {

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

  722.     unsigned i, j;

  723. 

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

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

  726. 

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

  728. 

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

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

  731. 

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

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

  734.             return -1;

  735.         }

  736.         if (get_bits1(gb)) {

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

  738.         } else {

  739.             mapping_setup->submaps = 1;

  740.         }

  741. 

  742.         if (get_bits1(gb)) {

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

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

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

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

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

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

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

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

  751.             }

  752.         } else {

  753.             mapping_setup->coupling_steps = 0;

  754.         }

  755. 

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

  757.                 i, mapping_setup->coupling_steps);

  758. 

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

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

  761.             return -1; // following spec.

  762.         }

  763. 

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

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

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

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

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

  769.         }

  770. 

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

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

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

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

  775. 

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

  777.                     mapping_setup->submap_floor[j],

  778.                     mapping_setup->submap_residue[j]);

  779.         }

  780.     }

  781.     return 0;

  782. }

  783. 

  784. // Process modes part

  785. 

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

  787. {

  788.     vorbis_floor *floors = vc->floors;

  789.     vorbis_floor0 *vf;

  790.     int idx;

  791.     int blockflag, n;

  792.     int32_t *map;

  793. 

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

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

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

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

  798. 

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

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

  801. 

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

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

  804.                              ((vf->bark_map_size) /

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

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

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

  808.         }

  809.         map[n] = -1;

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

  811.     }

  812. 

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

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

  815.     }

  816. }

  817. 

  818. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  819. {

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

  821.     unsigned i;

  822. 

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

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

  825. 

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

  827. 

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

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

  830. 

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

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

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

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

  835. 

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

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

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

  839.     }

  840.     return 0;

  841. }

  842. 

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

  844. 

  845. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  846. {

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

  848. 

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

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

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

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

  853.         return -1;

  854.     }

  855. 

  856.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  858.         return -2;

  859.     }

  860.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  862.         return -3;

  863.     }

  864.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  866.         return -4;

  867.     }

  868.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  870.         return -5;

  871.     }

  872.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  874.         return -6;

  875.     }

  876.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  878.         return -7;

  879.     }

  880.     if (!get_bits1(gb)) {

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

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

  883.     }

  884. 

  885.     return 0;

  886. }

  887. 

  888. // Process the identification header

  889. 

  890. static int vorbis_parse_id_hdr(vorbis_context *vc)

  891. {

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

  893.     unsigned bl0, bl1;

  894. 

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

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

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

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

  899.         return -1;

  900.     }

  901. 

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

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

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

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

  906.         return -1;

  907.     }

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

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

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

  911.         return -1;

  912.     }

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

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

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

  916.     bl0 = get_bits(gb, 4);

  917.     bl1 = get_bits(gb, 4);

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

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

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

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

  922.         return -3;

  923.     }

  924.     // output format int16

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

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

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

  928.         return -4;

  929.     }

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

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

  932. 

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

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

  935.         return -2;

  936.     }

  937. 

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

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

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

  941.     vc->previous_window  = 0;

  942. 

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

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

  945. 

  946.     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 ",

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

  948. 

  949. /*

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

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

  952.         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)));

  953.     }

  954. */

  955. 

  956.     return 0;

  957. }

  958. 

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

  960. 

  961. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  962. {

  963.     vorbis_context *vc = avccontext->priv_data ;

  964.     uint8_t *headers   = avccontext->extradata;

  965.     int headers_len    = avccontext->extradata_size;

  966.     uint8_t *header_start[3];

  967.     int header_len[3];

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

  969.     int hdr_type;

  970. 

  971.     vc->avccontext = avccontext;

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

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

  974. 

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

  976.         avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;

  977.         vc->scale_bias = 1.0f;

  978.     } else {

  979.         avccontext->sample_fmt = AV_SAMPLE_FMT_S16;

  980.         vc->scale_bias = 32768.0f;

  981.     }

  982. 

  983.     if (!headers_len) {

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

  985.         return -1;

  986.     }

  987. 

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

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

  990.         return -1;

  991.     }

  992. 

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

  994.     hdr_type = get_bits(gb, 8);

  995.     if (hdr_type != 1) {

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

  997.         return -1;

  998.     }

  999.     if (vorbis_parse_id_hdr(vc)) {

  1000.         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");

  1001.         vorbis_free(vc);

  1002.         return -1;

  1003.     }

  1004. 

  1005.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1006.     hdr_type = get_bits(gb, 8);

  1007.     if (hdr_type != 5) {

  1008.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1009.         vorbis_free(vc);

  1010.         return -1;

  1011.     }

  1012.     if (vorbis_parse_setup_hdr(vc)) {

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

  1014.         vorbis_free(vc);

  1015.         return -1;

  1016.     }

  1017. 

  1018.     if (vc->audio_channels > 8)

  1019.         avccontext->channel_layout = 0;

  1020.     else

  1021.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1022. 

  1023.     avccontext->channels    = vc->audio_channels;

  1024.     avccontext->sample_rate = vc->audio_samplerate;

  1025.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;

  1026. 

  1027.     return 0 ;

  1028. }

  1029. 

  1030. // Decode audiopackets -------------------------------------------------

  1031. 

  1032. // Read and decode floor

  1033. 

  1034. static int vorbis_floor0_decode(vorbis_context *vc,

  1035.                                 vorbis_floor_data *vfu, float *vec)

  1036. {

  1037.     vorbis_floor0 *vf = &vfu->t0;

  1038.     float *lsp = vf->lsp;

  1039.     unsigned amplitude, book_idx;

  1040.     unsigned blockflag = vc->modes[vc->mode_number].blockflag;

  1041. 

  1042.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1043.     if (amplitude > 0) {

  1044.         float last = 0;

  1045.         unsigned idx, lsp_len = 0;

  1046.         vorbis_codebook codebook;

  1047. 

  1048.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1049.         if (book_idx >= vf->num_books) {

  1050.             av_log(vc->avccontext, AV_LOG_ERROR,

  1051.                     "floor0 dec: booknumber too high!\n");

  1052.             book_idx =  0;

  1053.         }

  1054.         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);

  1055.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1056.         /* Invalid codebook! */

  1057.         if (!codebook.codevectors)

  1058.             return -1;

  1059. 

  1060.         while (lsp_len<vf->order) {

  1061.             int vec_off;

  1062. 

  1063.             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);

  1064.             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1065.             /* read temp vector */

  1066.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1067.                                codebook.nb_bits, codebook.maxdepth)

  1068.                       * codebook.dimensions;

  1069.             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);

  1070.             /* copy each vector component and add last to it */

  1071.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1072.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1073.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1074. 

  1075.             lsp_len += codebook.dimensions;

  1076.         }

  1077.         /* DEBUG: output lsp coeffs */

  1078.         {

  1079.             int idx;

  1080.             for (idx = 0; idx < lsp_len; ++idx)

  1081.                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1082.         }

  1083. 

  1084.         /* synthesize floor output vector */

  1085.         {

  1086.             int i;

  1087.             int order = vf->order;

  1088.             float wstep = M_PI / vf->bark_map_size;

  1089. 

  1090.             for (i = 0; i < order; i++)

  1091.                 lsp[i] = 2.0f * cos(lsp[i]);

  1092. 

  1093.             av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",

  1094.                     vf->map_size[blockflag], order, wstep);

  1095. 

  1096.             i = 0;

  1097.             while (i < vf->map_size[blockflag]) {

  1098.                 int j, iter_cond = vf->map[blockflag][i];

  1099.                 float p = 0.5f;

  1100.                 float q = 0.5f;

  1101.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1102. 

  1103.                 /* similar part for the q and p products */

  1104.                 for (j = 0; j + 1 < order; j += 2) {

  1105.                     q *= lsp[j]     - two_cos_w;

  1106.                     p *= lsp[j + 1] - two_cos_w;

  1107.                 }

  1108.                 if (j == order) { // even order

  1109.                     p *= p * (2.0f - two_cos_w);

  1110.                     q *= q * (2.0f + two_cos_w);

  1111.                 } else { // odd order

  1112.                     q *= two_cos_w-lsp[j]; // one more time for q

  1113. 

  1114.                     /* final step and square */

  1115.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1116.                     q *= q;

  1117.                 }

  1118. 

  1119.                 /* calculate linear floor value */

  1120.                 q = exp((((amplitude*vf->amplitude_offset) /

  1121.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1122.                          - vf->amplitude_offset) * .11512925f);

  1123. 

  1124.                 /* fill vector */

  1125.                 do {

  1126.                     vec[i] = q; ++i;

  1127.                 } while (vf->map[blockflag][i] == iter_cond);

  1128.             }

  1129.         }

  1130.     } else {

  1131.         /* this channel is unused */

  1132.         return 1;

  1133.     }

  1134. 

  1135.     av_dlog(NULL, " Floor0 decoded\n");

  1136. 

  1137.     return 0;

  1138. }

  1139. 

  1140. static int vorbis_floor1_decode(vorbis_context *vc,

  1141.                                 vorbis_floor_data *vfu, float *vec)

  1142. {

  1143.     vorbis_floor1 *vf = &vfu->t1;

  1144.     GetBitContext *gb = &vc->gb;

  1145.     uint16_t range_v[4] = { 256, 128, 86, 64 };

  1146.     unsigned range = range_v[vf->multiplier - 1];

  1147.     uint16_t floor1_Y[258];

  1148.     uint16_t floor1_Y_final[258];

  1149.     int floor1_flag[258];

  1150.     unsigned class, cdim, cbits, csub, cval, offset, i, j;

  1151.     int book, adx, ady, dy, off, predicted, err;

  1152. 

  1153. 

  1154.     if (!get_bits1(gb)) // silence

  1155.         return 1;

  1156. 

  1157. // Read values (or differences) for the floor's points

  1158. 

  1159.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1160.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1161. 

  1162.     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1163. 

  1164.     offset = 2;

  1165.     for (i = 0; i < vf->partitions; ++i) {

  1166.         class = vf->partition_class[i];

  1167.         cdim   = vf->class_dimensions[class];

  1168.         cbits  = vf->class_subclasses[class];

  1169.         csub = (1 << cbits) - 1;

  1170.         cval = 0;

  1171. 

  1172.         av_dlog(NULL, "Cbits %u\n", cbits);

  1173. 

  1174.         if (cbits) // this reads all subclasses for this partition's class

  1175.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[class]].vlc.table,

  1176.                             vc->codebooks[vf->class_masterbook[class]].nb_bits, 3);

  1177. 

  1178.         for (j = 0; j < cdim; ++j) {

  1179.             book = vf->subclass_books[class][cval & csub];

  1180. 

  1181.             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",

  1182.                     book, cbits, cval, get_bits_count(gb));

  1183. 

  1184.             cval = cval >> cbits;

  1185.             if (book > -1) {

  1186.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1187.                 vc->codebooks[book].nb_bits, 3);

  1188.             } else {

  1189.                 floor1_Y[offset+j] = 0;

  1190.             }

  1191. 

  1192.             av_dlog(NULL, " floor(%d) = %d \n",

  1193.                     vf->list[offset+j].x, floor1_Y[offset+j]);

  1194.         }

  1195.         offset+=cdim;

  1196.     }

  1197. 

  1198. // Amplitude calculation from the differences

  1199. 

  1200.     floor1_flag[0] = 1;

  1201.     floor1_flag[1] = 1;

  1202.     floor1_Y_final[0] = floor1_Y[0];

  1203.     floor1_Y_final[1] = floor1_Y[1];

  1204. 

  1205.     for (i = 2; i < vf->x_list_dim; ++i) {

  1206.         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;

  1207. 

  1208.         low_neigh_offs  = vf->list[i].low;

  1209.         high_neigh_offs = vf->list[i].high;

  1210.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1211.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1212.         ady = FFABS(dy);

  1213.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1214.         off = err / adx;

  1215.         if (dy < 0) {

  1216.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1217.         } else {

  1218.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1219.         } // render_point end

  1220. 

  1221.         val = floor1_Y[i];

  1222.         highroom = range-predicted;

  1223.         lowroom  = predicted;

  1224.         if (highroom < lowroom) {

  1225.             room = highroom * 2;

  1226.         } else {

  1227.             room = lowroom * 2;   // SPEC mispelling

  1228.         }

  1229.         if (val) {

  1230.             floor1_flag[low_neigh_offs]  = 1;

  1231.             floor1_flag[high_neigh_offs] = 1;

  1232.             floor1_flag[i]               = 1;

  1233.             if (val >= room) {

  1234.                 if (highroom > lowroom) {

  1235.                     floor1_Y_final[i] = val - lowroom + predicted;

  1236.                 } else {

  1237.                     floor1_Y_final[i] = predicted - val + highroom - 1;

  1238.                 }

  1239.             } else {

  1240.                 if (val & 1) {

  1241.                     floor1_Y_final[i] = predicted - (val + 1) / 2;

  1242.                 } else {

  1243.                     floor1_Y_final[i] = predicted + val / 2;

  1244.                 }

  1245.             }

  1246.         } else {

  1247.             floor1_flag[i]    = 0;

  1248.             floor1_Y_final[i] = predicted;

  1249.         }

  1250. 

  1251.         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",

  1252.                 vf->list[i].x, floor1_Y_final[i], val);

  1253.     }

  1254. 

  1255. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1256. 

  1257.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1258. 

  1259.     av_dlog(NULL, " Floor decoded\n");

  1260. 

  1261.     return 0;

  1262. }

  1263. 

  1264. // Read and decode residue

  1265. 

  1266. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1267.                                                            vorbis_residue *vr,

  1268.                                                            unsigned ch,

  1269.                                                            uint8_t *do_not_decode,

  1270.                                                            float *vec,

  1271.                                                            unsigned vlen,

  1272.                                                            int vr_type)

  1273. {

  1274.     GetBitContext *gb = &vc->gb;

  1275.     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;

  1276.     unsigned ptns_to_read = vr->ptns_to_read;

  1277.     uint8_t *classifs = vr->classifs;

  1278.     unsigned pass, ch_used, i, j, k, l;

  1279. 

  1280.     if (vr_type == 2) {

  1281.         for (j = 1; j < ch; ++j)

  1282.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1283.         if (do_not_decode[0])

  1284.             return 0;

  1285.         ch_used = 1;

  1286.     } else {

  1287.         ch_used = ch;

  1288.     }

  1289. 

  1290.     av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1291. 

  1292.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1293.         uint16_t voffset, partition_count, j_times_ptns_to_read;

  1294. 

  1295.         voffset = vr->begin;

  1296.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1297.             if (!pass) {

  1298.                 unsigned inverse_class = ff_inverse[vr->classifications];

  1299.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1300.                     if (!do_not_decode[j]) {

  1301.                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1302.                                                  vc->codebooks[vr->classbook].nb_bits, 3);

  1303. 

  1304.                         av_dlog(NULL, "Classword: %u\n", temp);

  1305. 

  1306.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1307.                         for (i = 0; i < c_p_c; ++i) {

  1308.                             unsigned temp2;

  1309. 

  1310.                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;

  1311.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1312.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1313.                             temp = temp2;

  1314.                         }

  1315.                     }

  1316.                     j_times_ptns_to_read += ptns_to_read;

  1317.                 }

  1318.             }

  1319.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1320.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1321.                     unsigned voffs;

  1322. 

  1323.                     if (!do_not_decode[j]) {

  1324.                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];

  1325.                         int vqbook  = vr->books[vqclass][pass];

  1326. 

  1327.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1328.                             unsigned coffs;

  1329.                             unsigned dim  = vc->codebooks[vqbook].dimensions;

  1330.                             unsigned step = dim == 1 ? vr->partition_size

  1331.                                                      : FASTDIV(vr->partition_size, dim);

  1332.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1333. 

  1334.                             if (vr_type == 0) {

  1335. 

  1336.                                 voffs = voffset+j*vlen;

  1337.                                 for (k = 0; k < step; ++k) {

  1338.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1339.                                     for (l = 0; l < dim; ++l)

  1340.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH

  1341.                                 }

  1342.                             } else if (vr_type == 1) {

  1343.                                 voffs = voffset + j * vlen;

  1344.                                 for (k = 0; k < step; ++k) {

  1345.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1346.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1347.                                         vec[voffs]+=codebook.codevectors[coffs+l];  // FPMATH

  1348. 

  1349.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d  \n",

  1350.                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1351.                                     }

  1352.                                 }

  1353.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1354.                                 voffs = voffset >> 1;

  1355. 

  1356.                                 if (dim == 2) {

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

  1358.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

  1359.                                         vec[voffs + k       ] += codebook.codevectors[coffs    ];  // FPMATH

  1360.                                         vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];  // FPMATH

  1361.                                     }

  1362.                                 } else if (dim == 4) {

  1363.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1364.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1365.                                         vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH

  1366.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH

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

  1368.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH

  1369.                                     }

  1370.                                 } else

  1371.                                 for (k = 0; k < step; ++k) {

  1372.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1373.                                     for (l = 0; l < dim; l += 2, voffs++) {

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

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

  1376. 

  1377.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1378.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1379.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1380.                                                 codebook.codevectors[coffs + l], coffs, l);

  1381.                                     }

  1382.                                 }

  1383. 

  1384.                             } else if (vr_type == 2) {

  1385.                                 voffs = voffset;

  1386. 

  1387.                                 for (k = 0; k < step; ++k) {

  1388.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1389.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1390.                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %

  1391. 

  1392.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1393.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1394.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1395.                                                 codebook.codevectors[coffs + l], coffs, l);

  1396.                                     }

  1397.                                 }

  1398.                             }

  1399.                         }

  1400.                     }

  1401.                     j_times_ptns_to_read += ptns_to_read;

  1402.                 }

  1403.                 ++partition_count;

  1404.                 voffset += vr->partition_size;

  1405.             }

  1406.         }

  1407.     }

  1408.     return 0;

  1409. }

  1410. 

  1411. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1412.                                         unsigned ch,

  1413.                                         uint8_t *do_not_decode,

  1414.                                         float *vec, unsigned vlen)

  1415. {

  1416.     if (vr->type == 2)

  1417.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1418.     else if (vr->type == 1)

  1419.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1420.     else if (vr->type == 0)

  1421.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1422.     else {

  1423.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1424.         return -1;

  1425.     }

  1426. }

  1427. 

  1428. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1429. {

  1430.     int i;

  1431.     for (i = 0;  i < blocksize;  i++) {

  1432.         if (mag[i] > 0.0) {

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

  1434.                 ang[i] = mag[i] - ang[i];

  1435.             } else {

  1436.                 float temp = ang[i];

  1437.                 ang[i]     = mag[i];

  1438.                 mag[i]    += temp;

  1439.             }

  1440.         } else {

  1441.             if (ang[i] > 0.0) {

  1442.                 ang[i] += mag[i];

  1443.             } else {

  1444.                 float temp = ang[i];

  1445.                 ang[i]     = mag[i];

  1446.                 mag[i]    -= temp;

  1447.             }

  1448.         }

  1449.     }

  1450. }

  1451. 

  1452. // Decode the audio packet using the functions above

  1453. 

  1454. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1455. {

  1456.     GetBitContext *gb = &vc->gb;

  1457.     FFTContext *mdct;

  1458.     unsigned previous_window = vc->previous_window;

  1459.     unsigned mode_number, blockflag, blocksize;

  1460.     int i, j;

  1461.     uint8_t no_residue[255];

  1462.     uint8_t do_not_decode[255];

  1463.     vorbis_mapping *mapping;

  1464.     float *ch_res_ptr   = vc->channel_residues;

  1465.     float *ch_floor_ptr = vc->channel_floors;

  1466.     uint8_t res_chan[255];

  1467.     unsigned res_num = 0;

  1468.     int retlen  = 0;

  1469. 

  1470.     if (get_bits1(gb)) {

  1471.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1472.         return -1; // packet type not audio

  1473.     }

  1474. 

  1475.     if (vc->mode_count == 1) {

  1476.         mode_number = 0;

  1477.     } else {

  1478.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1479.     }

  1480.     vc->mode_number = mode_number;

  1481.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1482. 

  1483.     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,

  1484.             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1485. 

  1486.     blockflag = vc->modes[mode_number].blockflag;

  1487.     blocksize = vc->blocksize[blockflag];

  1488.     if (blockflag)

  1489.         skip_bits(gb, 2); // previous_window, next_window

  1490. 

  1491.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

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

  1493. 

  1494. // Decode floor

  1495. 

  1496.     for (i = 0; i < vc->audio_channels; ++i) {

  1497.         vorbis_floor *floor;

  1498.         int ret;

  1499.         if (mapping->submaps > 1) {

  1500.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1501.         } else {

  1502.             floor = &vc->floors[mapping->submap_floor[0]];

  1503.         }

  1504. 

  1505.         ret = floor->decode(vc, &floor->data, ch_floor_ptr);

  1506. 

  1507.         if (ret < 0) {

  1508.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1509.             return -1;

  1510.         }

  1511.         no_residue[i] = ret;

  1512.         ch_floor_ptr += blocksize / 2;

  1513.     }

  1514. 

  1515. // Nonzero vector propagate

  1516. 

  1517.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1518.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1519.             no_residue[mapping->magnitude[i]] = 0;

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

  1521.         }

  1522.     }

  1523. 

  1524. // Decode residue

  1525. 

  1526.     for (i = 0; i < mapping->submaps; ++i) {

  1527.         vorbis_residue *residue;

  1528.         unsigned ch = 0;

  1529. 

  1530.         for (j = 0; j < vc->audio_channels; ++j) {

  1531.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1532.                 res_chan[j] = res_num;

  1533.                 if (no_residue[j]) {

  1534.                     do_not_decode[ch] = 1;

  1535.                 } else {

  1536.                     do_not_decode[ch] = 0;

  1537.                 }

  1538.                 ++ch;

  1539.                 ++res_num;

  1540.             }

  1541.         }

  1542.         residue = &vc->residues[mapping->submap_residue[i]];

  1543.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1544. 

  1545.         ch_res_ptr += ch * blocksize / 2;

  1546.     }

  1547. 

  1548. // Inverse coupling

  1549. 

  1550.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1551.         float *mag, *ang;

  1552. 

  1553.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

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

  1555.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1556.     }

  1557. 

  1558. // Dotproduct, MDCT

  1559. 

  1560.     mdct = &vc->mdct[blockflag];

  1561. 

  1562.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1563.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;

  1564.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1565.         vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);

  1566.         mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);

  1567.     }

  1568. 

  1569. // Overlap/add, save data for next overlapping  FPMATH

  1570. 

  1571.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

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

  1573.         unsigned bs0 = vc->blocksize[0];

  1574.         unsigned bs1 = vc->blocksize[1];

  1575.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1576.         float *saved      = vc->saved + j * bs1 / 4;

  1577.         float *ret        = vc->channel_floors + j * retlen;

  1578.         float *buf        = residue;

  1579.         const float *win  = vc->win[blockflag & previous_window];

  1580. 

  1581.         if (blockflag == previous_window) {

  1582.             vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);

  1583.         } else if (blockflag > previous_window) {

  1584.             vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);

  1585.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1586.         } else {

  1587.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1588.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);

  1589.         }

  1590.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1591.     }

  1592. 

  1593.     vc->previous_window = blockflag;

  1594.     return retlen;

  1595. }

  1596. 

  1597. // Return the decoded audio packet through the standard api

  1598. 

  1599. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1600.                                void *data, int *data_size,

  1601.                                AVPacket *avpkt)

  1602. {

  1603.     const uint8_t *buf = avpkt->data;

  1604.     int buf_size       = avpkt->size;

  1605.     vorbis_context *vc = avccontext->priv_data ;

  1606.     GetBitContext *gb = &(vc->gb);

  1607.     const float *channel_ptrs[255];

  1608.     int i, len;

  1609. 

  1610.     if (!buf_size)

  1611.         return 0;

  1612. 

  1613.     av_dlog(NULL, "packet length %d \n", buf_size);

  1614. 

  1615.     init_get_bits(gb, buf, buf_size*8);

  1616. 

  1617.     len = vorbis_parse_audio_packet(vc);

  1618. 

  1619.     if (len <= 0) {

  1620.         *data_size = 0;

  1621.         return buf_size;

  1622.     }

  1623. 

  1624.     if (!vc->first_frame) {

  1625.         vc->first_frame = 1;

  1626.         *data_size = 0;

  1627.         return buf_size ;

  1628.     }

  1629. 

  1630.     av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",

  1631.             get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);

  1632. 

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

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

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

  1636.     } else {

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

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

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

  1640.     }

  1641. 

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

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

  1644.     else

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

  1646.                                                vc->audio_channels);

  1647. 

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

  1649.                  av_get_bytes_per_sample(avccontext->sample_fmt);

  1650. 

  1651.     return buf_size ;

  1652. }

  1653. 

  1654. // Close decoder

  1655. 

  1656. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1657. {

  1658.     vorbis_context *vc = avccontext->priv_data;

  1659. 

  1660.     vorbis_free(vc);

  1661. 

  1662.     return 0 ;

  1663. }

  1664. 

  1665. AVCodec ff_vorbis_decoder = {

  1666.     "vorbis",

  1667.     AVMEDIA_TYPE_AUDIO,

  1668.     CODEC_ID_VORBIS,

  1669.     sizeof(vorbis_context),

  1670.     vorbis_decode_init,

  1671.     NULL,

  1672.     vorbis_decode_close,

  1673.     vorbis_decode_frame,

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

  1675.     .channel_layouts = ff_vorbis_channel_layouts,

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

  1677.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE

  1678.     },

  1679. };