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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 -1;\

  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. 

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

  246. 

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

  248. 

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

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

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

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

  253. 

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

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

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

  257. 

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

  259. 

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

  261.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  263.             goto error;

  264.         }

  265. 

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

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

  268.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  270.                    cb, codebook_setup->dimensions);

  271.             goto error;

  272.         }

  273.         entries = get_bits(gb, 24);

  274.         if (entries > V_MAX_VLCS) {

  275.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  277.                    cb, entries);

  278.             goto error;

  279.         }

  280. 

  281.         ordered = get_bits1(gb);

  282. 

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

  284.                 codebook_setup->dimensions, entries);

  285. 

  286.         if (!ordered) {

  287.             unsigned ce, flag;

  288.             unsigned sparse = get_bits1(gb);

  289. 

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

  291. 

  292.             if (sparse) {

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

  294. 

  295.                 used_entries = 0;

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

  297.                     flag = get_bits1(gb);

  298.                     if (flag) {

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

  300.                         ++used_entries;

  301.                     } else

  302.                         tmp_vlc_bits[ce] = 0;

  303.                 }

  304.             } else {

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

  306. 

  307.                 used_entries = entries;

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

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

  310.             }

  311.         } else {

  312.             unsigned current_entry  = 0;

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

  314. 

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

  316. 

  317.             used_entries = entries;

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

  319.                 unsigned i, number;

  320. 

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

  322. 

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

  324. 

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

  326. 

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

  328.                     if (i < used_entries)

  329.                         tmp_vlc_bits[i] = current_length;

  330. 

  331.                 current_entry+=number;

  332.             }

  333.             if (current_entry>used_entries) {

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

  335.                 goto error;

  336.             }

  337.         }

  338. 

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

  340. 

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

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

  343. 

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

  345. 

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

  347.             unsigned i, j, k;

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

  349. 

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

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

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

  353.             unsigned codebook_sequence_p = get_bits1(gb);

  354. 

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

  356.                     codebook_lookup_values);

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

  358.                     codebook_delta_value, codebook_minimum_value);

  359. 

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

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

  362. 

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

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

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

  366.             }

  367. 

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

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

  370.                                                                     codebook_setup->dimensions *

  371.                                                                     sizeof(*codebook_setup->codevectors))

  372.                                                        : NULL;

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

  374.                 unsigned dim = codebook_setup->dimensions;

  375. 

  376.                 if (tmp_vlc_bits[i]) {

  377.                     float last = 0.0;

  378.                     unsigned lookup_offset = i;

  379. 

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

  381. 

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

  383.                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  385.                         if (codebook_sequence_p)

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

  387.                         lookup_offset/=codebook_lookup_values;

  388.                     }

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

  390. 

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

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

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

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

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

  396. 

  397.                     ++j;

  398.                 }

  399.             }

  400.             if (j != used_entries) {

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

  402.                 goto error;

  403.             }

  404.             entries = used_entries;

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

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

  407.             goto error;

  408.         }

  409. 

  410. // Initialize VLC table

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

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

  413.             goto error;

  414.         }

  415.         codebook_setup->maxdepth = 0;

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

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

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

  419. 

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

  421.             codebook_setup->nb_bits = V_NB_BITS2;

  422.         else

  423.             codebook_setup->nb_bits = V_NB_BITS;

  424. 

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

  426. 

  427.         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)) {

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

  429.             goto error;

  430.         }

  431.     }

  432. 

  433.     av_free(tmp_vlc_bits);

  434.     av_free(tmp_vlc_codes);

  435.     av_free(codebook_multiplicands);

  436.     return 0;

  437. 

  438. // Error:

  439. error:

  440.     av_free(tmp_vlc_bits);

  441.     av_free(tmp_vlc_codes);

  442.     av_free(codebook_multiplicands);

  443.     return -1;

  444. }

  445. 

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

  447. 

  448. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  449. {

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

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

  452. 

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

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

  455. 

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

  457.                 vorbis_time_count, vorbis_tdtransform);

  458. 

  459.         if (vorbis_tdtransform) {

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

  461.             return -1;

  462.         }

  463.     }

  464.     return 0;

  465. }

  466. 

  467. // Process floors part

  468. 

  469. static int vorbis_floor0_decode(vorbis_context *vc,

  470.                                 vorbis_floor_data *vfu, float *vec);

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

  472. static int vorbis_floor1_decode(vorbis_context *vc,

  473.                                 vorbis_floor_data *vfu, float *vec);

  474. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  475. {

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

  477.     int i,j,k;

  478. 

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

  480. 

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

  482. 

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

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

  485. 

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

  487. 

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

  489. 

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

  491.             int maximum_class = -1;

  492.             unsigned rangebits, rangemax, floor1_values = 2;

  493. 

  494.             floor_setup->decode = vorbis_floor1_decode;

  495. 

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

  497. 

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

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

  500. 

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

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

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

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

  505. 

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

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

  508. 

  509.             }

  510. 

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

  512. 

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

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

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

  516. 

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

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

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

  520. 

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

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

  523. 

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

  525.                 }

  526. 

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

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

  529.                     if (bits != -1)

  530.                         VALIDATE_INDEX(bits, vc->codebook_count)

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

  532. 

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

  534.                 }

  535.             }

  536. 

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

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

  539. 

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

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

  542. 

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

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

  545. 

  546. 

  547.             rangebits = get_bits(gb, 4);

  548.             rangemax = (1 << rangebits);

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

  550.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

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

  553.                 return -1;

  554.             }

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

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

  557. 

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

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

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

  561. 

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

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

  564.                 }

  565.             }

  566. 

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

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

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

  570.             unsigned max_codebook_dim = 0;

  571. 

  572.             floor_setup->decode = vorbis_floor0_decode;

  573. 

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

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

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

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

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

  579.              * 2^0 - 1 == 0                             */

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

  581.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

  583.                 return -1;

  584.             }

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

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

  587. 

  588.             /* allocate mem for booklist */

  589.             floor_setup->data.t0.book_list =

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

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

  592.                 return -1;

  593.             /* read book indexes */

  594.             {

  595.                 int idx;

  596.                 unsigned book_idx;

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

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

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

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

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

  602.                 }

  603.             }

  604. 

  605.             create_map(vc, i);

  606. 

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

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

  609.             floor_setup->data.t0.lsp =

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

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

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

  613.                 return -1;

  614. 

  615.             /* debug output parsed headers */

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

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

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

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

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

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

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

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

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

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

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

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

  628.             {

  629.                 int idx;

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

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

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

  633.                 }

  634.             }

  635.         } else {

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

  637.             return -1;

  638.         }

  639.     }

  640.     return 0;

  641. }

  642. 

  643. // Process residues part

  644. 

  645. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  646. {

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

  648.     unsigned i, j, k;

  649. 

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

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

  652. 

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

  654. 

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

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

  657.         uint8_t cascade[64];

  658.         unsigned high_bits, low_bits;

  659. 

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

  661. 

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

  663. 

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

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

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

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

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

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

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

  671.             av_log(vc->avccontext, AV_LOG_ERROR,

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

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

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

  675.             return -1;

  676.         }

  677. 

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

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

  680. 

  681.         res_setup->ptns_to_read =

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

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

  684.                                         vc->audio_channels *

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

  686.         if (!res_setup->classifs)

  687.             return AVERROR(ENOMEM);

  688. 

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

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

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

  692. 

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

  694.             high_bits = 0;

  695.             low_bits  = get_bits(gb, 3);

  696.             if (get_bits1(gb))

  697.                 high_bits = get_bits(gb, 5);

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

  699. 

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

  701.         }

  702. 

  703.         res_setup->maxpass = 0;

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

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

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

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

  708. 

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

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

  711. 

  712.                     if (k>res_setup->maxpass)

  713.                         res_setup->maxpass = k;

  714.                 } else {

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

  716.                 }

  717.             }

  718.         }

  719.     }

  720.     return 0;

  721. }

  722. 

  723. // Process mappings part

  724. 

  725. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  726. {

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

  728.     unsigned i, j;

  729. 

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

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

  732. 

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

  734. 

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

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

  737. 

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

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

  740.             return -1;

  741.         }

  742.         if (get_bits1(gb)) {

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

  744.         } else {

  745.             mapping_setup->submaps = 1;

  746.         }

  747. 

  748.         if (get_bits1(gb)) {

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

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

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

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

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

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

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

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

  757.             }

  758.         } else {

  759.             mapping_setup->coupling_steps = 0;

  760.         }

  761. 

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

  763.                 i, mapping_setup->coupling_steps);

  764. 

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

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

  767.             return -1; // following spec.

  768.         }

  769. 

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

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

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

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

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

  775.         }

  776. 

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

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

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

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

  781. 

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

  783.                     mapping_setup->submap_floor[j],

  784.                     mapping_setup->submap_residue[j]);

  785.         }

  786.     }

  787.     return 0;

  788. }

  789. 

  790. // Process modes part

  791. 

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

  793. {

  794.     vorbis_floor *floors = vc->floors;

  795.     vorbis_floor0 *vf;

  796.     int idx;

  797.     int blockflag, n;

  798.     int32_t *map;

  799. 

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

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

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

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

  804. 

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

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

  807. 

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

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

  810.                              ((vf->bark_map_size) /

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

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

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

  814.         }

  815.         map[n] = -1;

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

  817.     }

  818. 

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

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

  821.     }

  822. }

  823. 

  824. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  825. {

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

  827.     unsigned i;

  828. 

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

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

  831. 

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

  833. 

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

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

  836. 

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

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

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

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

  841. 

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

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

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

  845.     }

  846.     return 0;

  847. }

  848. 

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

  850. 

  851. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  852. {

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

  854. 

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

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

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

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

  859.         return -1;

  860.     }

  861. 

  862.     if (vorbis_parse_setup_hdr_codebooks(vc)) {

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

  864.         return -2;

  865.     }

  866.     if (vorbis_parse_setup_hdr_tdtransforms(vc)) {

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

  868.         return -3;

  869.     }

  870.     if (vorbis_parse_setup_hdr_floors(vc)) {

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

  872.         return -4;

  873.     }

  874.     if (vorbis_parse_setup_hdr_residues(vc)) {

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

  876.         return -5;

  877.     }

  878.     if (vorbis_parse_setup_hdr_mappings(vc)) {

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

  880.         return -6;

  881.     }

  882.     if (vorbis_parse_setup_hdr_modes(vc)) {

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

  884.         return -7;

  885.     }

  886.     if (!get_bits1(gb)) {

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

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

  889.     }

  890. 

  891.     return 0;

  892. }

  893. 

  894. // Process the identification header

  895. 

  896. static int vorbis_parse_id_hdr(vorbis_context *vc)

  897. {

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

  899.     unsigned bl0, bl1;

  900. 

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

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

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

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

  905.         return -1;

  906.     }

  907. 

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

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

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

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

  912.         return -1;

  913.     }

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

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

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

  917.         return -1;

  918.     }

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

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

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

  922.     bl0 = get_bits(gb, 4);

  923.     bl1 = get_bits(gb, 4);

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

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

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

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

  928.         return -3;

  929.     }

  930.     // output format int16

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

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

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

  934.         return -4;

  935.     }

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

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

  938. 

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

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

  941.         return -2;

  942.     }

  943. 

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

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

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

  947.     vc->previous_window  = 0;

  948. 

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

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

  951. 

  952.     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 ",

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

  954. 

  955. /*

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

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

  958.         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)));

  959.     }

  960. */

  961. 

  962.     return 0;

  963. }

  964. 

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

  966. 

  967. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  968. {

  969.     vorbis_context *vc = avccontext->priv_data ;

  970.     uint8_t *headers   = avccontext->extradata;

  971.     int headers_len    = avccontext->extradata_size;

  972.     uint8_t *header_start[3];

  973.     int header_len[3];

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

  975.     int hdr_type;

  976. 

  977.     vc->avccontext = avccontext;

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

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

  980. 

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

  982.         avccontext->sample_fmt = AV_SAMPLE_FMT_FLT;

  983.         vc->scale_bias = 1.0f;

  984.     } else {

  985.         avccontext->sample_fmt = AV_SAMPLE_FMT_S16;

  986.         vc->scale_bias = 32768.0f;

  987.     }

  988. 

  989.     if (!headers_len) {

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

  991.         return -1;

  992.     }

  993. 

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

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

  996.         return -1;

  997.     }

  998. 

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

  1000.     hdr_type = get_bits(gb, 8);

  1001.     if (hdr_type != 1) {

  1002.         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");

  1003.         return -1;

  1004.     }

  1005.     if (vorbis_parse_id_hdr(vc)) {

  1006.         av_log(avccontext, AV_LOG_ERROR, "Id header corrupt.\n");

  1007.         vorbis_free(vc);

  1008.         return -1;

  1009.     }

  1010. 

  1011.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1012.     hdr_type = get_bits(gb, 8);

  1013.     if (hdr_type != 5) {

  1014.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1015.         vorbis_free(vc);

  1016.         return -1;

  1017.     }

  1018.     if (vorbis_parse_setup_hdr(vc)) {

  1019.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1020.         vorbis_free(vc);

  1021.         return -1;

  1022.     }

  1023. 

  1024.     if (vc->audio_channels > 8)

  1025.         avccontext->channel_layout = 0;

  1026.     else

  1027.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1028. 

  1029.     avccontext->channels    = vc->audio_channels;

  1030.     avccontext->sample_rate = vc->audio_samplerate;

  1031.     avccontext->frame_size  = FFMIN(vc->blocksize[0], vc->blocksize[1]) >> 2;

  1032. 

  1033.     return 0 ;

  1034. }

  1035. 

  1036. // Decode audiopackets -------------------------------------------------

  1037. 

  1038. // Read and decode floor

  1039. 

  1040. static int vorbis_floor0_decode(vorbis_context *vc,

  1041.                                 vorbis_floor_data *vfu, float *vec)

  1042. {

  1043.     vorbis_floor0 *vf = &vfu->t0;

  1044.     float *lsp = vf->lsp;

  1045.     unsigned amplitude, book_idx;

  1046.     unsigned blockflag = vc->modes[vc->mode_number].blockflag;

  1047. 

  1048.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1049.     if (amplitude > 0) {

  1050.         float last = 0;

  1051.         unsigned idx, lsp_len = 0;

  1052.         vorbis_codebook codebook;

  1053. 

  1054.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1055.         if (book_idx >= vf->num_books) {

  1056.             av_log(vc->avccontext, AV_LOG_ERROR,

  1057.                     "floor0 dec: booknumber too high!\n");

  1058.             book_idx =  0;

  1059.         }

  1060.         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);

  1061.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1062.         /* Invalid codebook! */

  1063.         if (!codebook.codevectors)

  1064.             return -1;

  1065. 

  1066.         while (lsp_len<vf->order) {

  1067.             int vec_off;

  1068. 

  1069.             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);

  1070.             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1071.             /* read temp vector */

  1072.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1073.                                codebook.nb_bits, codebook.maxdepth)

  1074.                       * codebook.dimensions;

  1075.             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);

  1076.             /* copy each vector component and add last to it */

  1077.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1078.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1079.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1080. 

  1081.             lsp_len += codebook.dimensions;

  1082.         }

  1083.         /* DEBUG: output lsp coeffs */

  1084.         {

  1085.             int idx;

  1086.             for (idx = 0; idx < lsp_len; ++idx)

  1087.                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1088.         }

  1089. 

  1090.         /* synthesize floor output vector */

  1091.         {

  1092.             int i;

  1093.             int order = vf->order;

  1094.             float wstep = M_PI / vf->bark_map_size;

  1095. 

  1096.             for (i = 0; i < order; i++)

  1097.                 lsp[i] = 2.0f * cos(lsp[i]);

  1098. 

  1099.             av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",

  1100.                     vf->map_size[blockflag], order, wstep);

  1101. 

  1102.             i = 0;

  1103.             while (i < vf->map_size[blockflag]) {

  1104.                 int j, iter_cond = vf->map[blockflag][i];

  1105.                 float p = 0.5f;

  1106.                 float q = 0.5f;

  1107.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1108. 

  1109.                 /* similar part for the q and p products */

  1110.                 for (j = 0; j + 1 < order; j += 2) {

  1111.                     q *= lsp[j]     - two_cos_w;

  1112.                     p *= lsp[j + 1] - two_cos_w;

  1113.                 }

  1114.                 if (j == order) { // even order

  1115.                     p *= p * (2.0f - two_cos_w);

  1116.                     q *= q * (2.0f + two_cos_w);

  1117.                 } else { // odd order

  1118.                     q *= two_cos_w-lsp[j]; // one more time for q

  1119. 

  1120.                     /* final step and square */

  1121.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1122.                     q *= q;

  1123.                 }

  1124. 

  1125.                 /* calculate linear floor value */

  1126.                 q = exp((((amplitude*vf->amplitude_offset) /

  1127.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1128.                          - vf->amplitude_offset) * .11512925f);

  1129. 

  1130.                 /* fill vector */

  1131.                 do {

  1132.                     vec[i] = q; ++i;

  1133.                 } while (vf->map[blockflag][i] == iter_cond);

  1134.             }

  1135.         }

  1136.     } else {

  1137.         /* this channel is unused */

  1138.         return 1;

  1139.     }

  1140. 

  1141.     av_dlog(NULL, " Floor0 decoded\n");

  1142. 

  1143.     return 0;

  1144. }

  1145. 

  1146. static int vorbis_floor1_decode(vorbis_context *vc,

  1147.                                 vorbis_floor_data *vfu, float *vec)

  1148. {

  1149.     vorbis_floor1 *vf = &vfu->t1;

  1150.     GetBitContext *gb = &vc->gb;

  1151.     uint16_t range_v[4] = { 256, 128, 86, 64 };

  1152.     unsigned range = range_v[vf->multiplier - 1];

  1153.     uint16_t floor1_Y[258];

  1154.     uint16_t floor1_Y_final[258];

  1155.     int floor1_flag[258];

  1156.     unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;

  1157.     int book, adx, ady, dy, off, predicted, err;

  1158. 

  1159. 

  1160.     if (!get_bits1(gb)) // silence

  1161.         return 1;

  1162. 

  1163. // Read values (or differences) for the floor's points

  1164. 

  1165.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1166.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1167. 

  1168.     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1169. 

  1170.     offset = 2;

  1171.     for (i = 0; i < vf->partitions; ++i) {

  1172.         partition_class = vf->partition_class[i];

  1173.         cdim   = vf->class_dimensions[partition_class];

  1174.         cbits  = vf->class_subclasses[partition_class];

  1175.         csub = (1 << cbits) - 1;

  1176.         cval = 0;

  1177. 

  1178.         av_dlog(NULL, "Cbits %u\n", cbits);

  1179. 

  1180.         if (cbits) // this reads all subclasses for this partition's class

  1181.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,

  1182.                             vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);

  1183. 

  1184.         for (j = 0; j < cdim; ++j) {

  1185.             book = vf->subclass_books[partition_class][cval & csub];

  1186. 

  1187.             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",

  1188.                     book, cbits, cval, get_bits_count(gb));

  1189. 

  1190.             cval = cval >> cbits;

  1191.             if (book > -1) {

  1192.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1193.                 vc->codebooks[book].nb_bits, 3);

  1194.             } else {

  1195.                 floor1_Y[offset+j] = 0;

  1196.             }

  1197. 

  1198.             av_dlog(NULL, " floor(%d) = %d \n",

  1199.                     vf->list[offset+j].x, floor1_Y[offset+j]);

  1200.         }

  1201.         offset+=cdim;

  1202.     }

  1203. 

  1204. // Amplitude calculation from the differences

  1205. 

  1206.     floor1_flag[0] = 1;

  1207.     floor1_flag[1] = 1;

  1208.     floor1_Y_final[0] = floor1_Y[0];

  1209.     floor1_Y_final[1] = floor1_Y[1];

  1210. 

  1211.     for (i = 2; i < vf->x_list_dim; ++i) {

  1212.         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;

  1213. 

  1214.         low_neigh_offs  = vf->list[i].low;

  1215.         high_neigh_offs = vf->list[i].high;

  1216.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1217.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1218.         ady = FFABS(dy);

  1219.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1220.         off = err / adx;

  1221.         if (dy < 0) {

  1222.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1223.         } else {

  1224.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1225.         } // render_point end

  1226. 

  1227.         val = floor1_Y[i];

  1228.         highroom = range-predicted;

  1229.         lowroom  = predicted;

  1230.         if (highroom < lowroom) {

  1231.             room = highroom * 2;

  1232.         } else {

  1233.             room = lowroom * 2;   // SPEC mispelling

  1234.         }

  1235.         if (val) {

  1236.             floor1_flag[low_neigh_offs]  = 1;

  1237.             floor1_flag[high_neigh_offs] = 1;

  1238.             floor1_flag[i]               = 1;

  1239.             if (val >= room) {

  1240.                 if (highroom > lowroom) {

  1241.                     floor1_Y_final[i] = val - lowroom + predicted;

  1242.                 } else {

  1243.                     floor1_Y_final[i] = predicted - val + highroom - 1;

  1244.                 }

  1245.             } else {

  1246.                 if (val & 1) {

  1247.                     floor1_Y_final[i] = predicted - (val + 1) / 2;

  1248.                 } else {

  1249.                     floor1_Y_final[i] = predicted + val / 2;

  1250.                 }

  1251.             }

  1252.         } else {

  1253.             floor1_flag[i]    = 0;

  1254.             floor1_Y_final[i] = predicted;

  1255.         }

  1256. 

  1257.         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",

  1258.                 vf->list[i].x, floor1_Y_final[i], val);

  1259.     }

  1260. 

  1261. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1262. 

  1263.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1264. 

  1265.     av_dlog(NULL, " Floor decoded\n");

  1266. 

  1267.     return 0;

  1268. }

  1269. 

  1270. // Read and decode residue

  1271. 

  1272. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1273.                                                            vorbis_residue *vr,

  1274.                                                            unsigned ch,

  1275.                                                            uint8_t *do_not_decode,

  1276.                                                            float *vec,

  1277.                                                            unsigned vlen,

  1278.                                                            int vr_type)

  1279. {

  1280.     GetBitContext *gb = &vc->gb;

  1281.     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;

  1282.     unsigned ptns_to_read = vr->ptns_to_read;

  1283.     uint8_t *classifs = vr->classifs;

  1284.     unsigned pass, ch_used, i, j, k, l;

  1285. 

  1286.     if (vr_type == 2) {

  1287.         for (j = 1; j < ch; ++j)

  1288.             do_not_decode[0] &= do_not_decode[j];  // FIXME - clobbering input

  1289.         if (do_not_decode[0])

  1290.             return 0;

  1291.         ch_used = 1;

  1292.     } else {

  1293.         ch_used = ch;

  1294.     }

  1295. 

  1296.     av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1297. 

  1298.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1299.         uint16_t voffset, partition_count, j_times_ptns_to_read;

  1300. 

  1301.         voffset = vr->begin;

  1302.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1303.             if (!pass) {

  1304.                 unsigned inverse_class = ff_inverse[vr->classifications];

  1305.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1306.                     if (!do_not_decode[j]) {

  1307.                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1308.                                                  vc->codebooks[vr->classbook].nb_bits, 3);

  1309. 

  1310.                         av_dlog(NULL, "Classword: %u\n", temp);

  1311. 

  1312.                         assert(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1313.                         for (i = 0; i < c_p_c; ++i) {

  1314.                             unsigned temp2;

  1315. 

  1316.                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;

  1317.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1318.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1319.                             temp = temp2;

  1320.                         }

  1321.                     }

  1322.                     j_times_ptns_to_read += ptns_to_read;

  1323.                 }

  1324.             }

  1325.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1326.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1327.                     unsigned voffs;

  1328. 

  1329.                     if (!do_not_decode[j]) {

  1330.                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];

  1331.                         int vqbook  = vr->books[vqclass][pass];

  1332. 

  1333.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1334.                             unsigned coffs;

  1335.                             unsigned dim  = vc->codebooks[vqbook].dimensions;

  1336.                             unsigned step = dim == 1 ? vr->partition_size

  1337.                                                      : FASTDIV(vr->partition_size, dim);

  1338.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1339. 

  1340.                             if (vr_type == 0) {

  1341. 

  1342.                                 voffs = voffset+j*vlen;

  1343.                                 for (k = 0; k < step; ++k) {

  1344.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1345.                                     for (l = 0; l < dim; ++l)

  1346.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];  // FPMATH

  1347.                                 }

  1348.                             } else if (vr_type == 1) {

  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, ++voffs) {

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

  1354. 

  1355.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d  \n",

  1356.                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1357.                                     }

  1358.                                 }

  1359.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1360.                                 voffs = voffset >> 1;

  1361. 

  1362.                                 if (dim == 2) {

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

  1364.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

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

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

  1367.                                     }

  1368.                                 } else if (dim == 4) {

  1369.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1370.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

  1371.                                         vec[voffs           ] += codebook.codevectors[coffs    ];  // FPMATH

  1372.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];  // FPMATH

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

  1374.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];  // FPMATH

  1375.                                     }

  1376.                                 } else

  1377.                                 for (k = 0; k < step; ++k) {

  1378.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1379.                                     for (l = 0; l < dim; l += 2, voffs++) {

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

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

  1382. 

  1383.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1384.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1385.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1386.                                                 codebook.codevectors[coffs + l], coffs, l);

  1387.                                     }

  1388.                                 }

  1389. 

  1390.                             } else if (vr_type == 2) {

  1391.                                 voffs = voffset;

  1392. 

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

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

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

  1396.                                         vec[voffs / ch + (voffs % ch) * vlen] += codebook.codevectors[coffs + l];  // FPMATH FIXME use if and counter instead of / and %

  1397. 

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

  1399.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1400.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1401.                                                 codebook.codevectors[coffs + l], coffs, l);

  1402.                                     }

  1403.                                 }

  1404.                             }

  1405.                         }

  1406.                     }

  1407.                     j_times_ptns_to_read += ptns_to_read;

  1408.                 }

  1409.                 ++partition_count;

  1410.                 voffset += vr->partition_size;

  1411.             }

  1412.         }

  1413.     }

  1414.     return 0;

  1415. }

  1416. 

  1417. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1418.                                         unsigned ch,

  1419.                                         uint8_t *do_not_decode,

  1420.                                         float *vec, unsigned vlen)

  1421. {

  1422.     if (vr->type == 2)

  1423.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 2);

  1424.     else if (vr->type == 1)

  1425.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 1);

  1426.     else if (vr->type == 0)

  1427.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, 0);

  1428.     else {

  1429.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1430.         return -1;

  1431.     }

  1432. }

  1433. 

  1434. void vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1435. {

  1436.     int i;

  1437.     for (i = 0;  i < blocksize;  i++) {

  1438.         if (mag[i] > 0.0) {

  1439.             if (ang[i] > 0.0) {

  1440.                 ang[i] = mag[i] - ang[i];

  1441.             } else {

  1442.                 float temp = ang[i];

  1443.                 ang[i]     = mag[i];

  1444.                 mag[i]    += temp;

  1445.             }

  1446.         } else {

  1447.             if (ang[i] > 0.0) {

  1448.                 ang[i] += mag[i];

  1449.             } else {

  1450.                 float temp = ang[i];

  1451.                 ang[i]     = mag[i];

  1452.                 mag[i]    -= temp;

  1453.             }

  1454.         }

  1455.     }

  1456. }

  1457. 

  1458. // Decode the audio packet using the functions above

  1459. 

  1460. static int vorbis_parse_audio_packet(vorbis_context *vc)

  1461. {

  1462.     GetBitContext *gb = &vc->gb;

  1463.     FFTContext *mdct;

  1464.     unsigned previous_window = vc->previous_window;

  1465.     unsigned mode_number, blockflag, blocksize;

  1466.     int i, j;

  1467.     uint8_t no_residue[255];

  1468.     uint8_t do_not_decode[255];

  1469.     vorbis_mapping *mapping;

  1470.     float *ch_res_ptr   = vc->channel_residues;

  1471.     float *ch_floor_ptr = vc->channel_floors;

  1472.     uint8_t res_chan[255];

  1473.     unsigned res_num = 0;

  1474.     int retlen  = 0;

  1475. 

  1476.     if (get_bits1(gb)) {

  1477.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1478.         return -1; // packet type not audio

  1479.     }

  1480. 

  1481.     if (vc->mode_count == 1) {

  1482.         mode_number = 0;

  1483.     } else {

  1484.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1485.     }

  1486.     vc->mode_number = mode_number;

  1487.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1488. 

  1489.     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,

  1490.             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1491. 

  1492.     blockflag = vc->modes[mode_number].blockflag;

  1493.     blocksize = vc->blocksize[blockflag];

  1494.     if (blockflag)

  1495.         skip_bits(gb, 2); // previous_window, next_window

  1496. 

  1497.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1498.     memset(ch_floor_ptr, 0, sizeof(float) * vc->audio_channels * blocksize / 2); //FIXME can this be removed ?

  1499. 

  1500. // Decode floor

  1501. 

  1502.     for (i = 0; i < vc->audio_channels; ++i) {

  1503.         vorbis_floor *floor;

  1504.         int ret;

  1505.         if (mapping->submaps > 1) {

  1506.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1507.         } else {

  1508.             floor = &vc->floors[mapping->submap_floor[0]];

  1509.         }

  1510. 

  1511.         ret = floor->decode(vc, &floor->data, ch_floor_ptr);

  1512. 

  1513.         if (ret < 0) {

  1514.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1515.             return -1;

  1516.         }

  1517.         no_residue[i] = ret;

  1518.         ch_floor_ptr += blocksize / 2;

  1519.     }

  1520. 

  1521. // Nonzero vector propagate

  1522. 

  1523.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1524.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1525.             no_residue[mapping->magnitude[i]] = 0;

  1526.             no_residue[mapping->angle[i]]     = 0;

  1527.         }

  1528.     }

  1529. 

  1530. // Decode residue

  1531. 

  1532.     for (i = 0; i < mapping->submaps; ++i) {

  1533.         vorbis_residue *residue;

  1534.         unsigned ch = 0;

  1535. 

  1536.         for (j = 0; j < vc->audio_channels; ++j) {

  1537.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1538.                 res_chan[j] = res_num;

  1539.                 if (no_residue[j]) {

  1540.                     do_not_decode[ch] = 1;

  1541.                 } else {

  1542.                     do_not_decode[ch] = 0;

  1543.                 }

  1544.                 ++ch;

  1545.                 ++res_num;

  1546.             }

  1547.         }

  1548.         residue = &vc->residues[mapping->submap_residue[i]];

  1549.         vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, blocksize/2);

  1550. 

  1551.         ch_res_ptr += ch * blocksize / 2;

  1552.     }

  1553. 

  1554. // Inverse coupling

  1555. 

  1556.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1557.         float *mag, *ang;

  1558. 

  1559.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

  1560.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1561.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1562.     }

  1563. 

  1564. // Dotproduct, MDCT

  1565. 

  1566.     mdct = &vc->mdct[blockflag];

  1567. 

  1568.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1569.         ch_floor_ptr = vc->channel_floors   + j           * blocksize / 2;

  1570.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1571.         vc->dsp.vector_fmul(ch_floor_ptr, ch_floor_ptr, ch_res_ptr, blocksize / 2);

  1572.         mdct->imdct_half(mdct, ch_res_ptr, ch_floor_ptr);

  1573.     }

  1574. 

  1575. // Overlap/add, save data for next overlapping  FPMATH

  1576. 

  1577.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

  1578.     for (j = 0; j < vc->audio_channels; j++) {

  1579.         unsigned bs0 = vc->blocksize[0];

  1580.         unsigned bs1 = vc->blocksize[1];

  1581.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1582.         float *saved      = vc->saved + j * bs1 / 4;

  1583.         float *ret        = vc->channel_floors + j * retlen;

  1584.         float *buf        = residue;

  1585.         const float *win  = vc->win[blockflag & previous_window];

  1586. 

  1587.         if (blockflag == previous_window) {

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

  1589.         } else if (blockflag > previous_window) {

  1590.             vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);

  1591.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1592.         } else {

  1593.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1594.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);

  1595.         }

  1596.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1597.     }

  1598. 

  1599.     vc->previous_window = blockflag;

  1600.     return retlen;

  1601. }

  1602. 

  1603. // Return the decoded audio packet through the standard api

  1604. 

  1605. static int vorbis_decode_frame(AVCodecContext *avccontext,

  1606.                                void *data, int *data_size,

  1607.                                AVPacket *avpkt)

  1608. {

  1609.     const uint8_t *buf = avpkt->data;

  1610.     int buf_size       = avpkt->size;

  1611.     vorbis_context *vc = avccontext->priv_data ;

  1612.     GetBitContext *gb = &(vc->gb);

  1613.     const float *channel_ptrs[255];

  1614.     int i, len;

  1615. 

  1616.     if (!buf_size)

  1617.         return 0;

  1618. 

  1619.     av_dlog(NULL, "packet length %d \n", buf_size);

  1620. 

  1621.     init_get_bits(gb, buf, buf_size*8);

  1622. 

  1623.     len = vorbis_parse_audio_packet(vc);

  1624. 

  1625.     if (len <= 0) {

  1626.         *data_size = 0;

  1627.         return buf_size;

  1628.     }

  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.     if (vc->audio_channels > 8) {

  1640.         for (i = 0; i < vc->audio_channels; i++)

  1641.             channel_ptrs[i] = vc->channel_floors + i * len;

  1642.     } else {

  1643.         for (i = 0; i < vc->audio_channels; i++)

  1644.             channel_ptrs[i] = vc->channel_floors +

  1645.                               len * ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1646.     }

  1647. 

  1648.     if (avccontext->sample_fmt == AV_SAMPLE_FMT_FLT)

  1649.         vc->fmt_conv.float_interleave(data, channel_ptrs, len, vc->audio_channels);

  1650.     else

  1651.         vc->fmt_conv.float_to_int16_interleave(data, channel_ptrs, len,

  1652.                                                vc->audio_channels);

  1653. 

  1654.     *data_size = len * vc->audio_channels *

  1655.                  av_get_bytes_per_sample(avccontext->sample_fmt);

  1656. 

  1657.     return buf_size ;

  1658. }

  1659. 

  1660. // Close decoder

  1661. 

  1662. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1663. {

  1664.     vorbis_context *vc = avccontext->priv_data;

  1665. 

  1666.     vorbis_free(vc);

  1667. 

  1668.     return 0 ;

  1669. }

  1670. 

  1671. AVCodec ff_vorbis_decoder = {

  1672.     .name           = "vorbis",

  1673.     .type           = AVMEDIA_TYPE_AUDIO,

  1674.     .id             = CODEC_ID_VORBIS,

  1675.     .priv_data_size = sizeof(vorbis_context),

  1676.     .init           = vorbis_decode_init,

  1677.     .close          = vorbis_decode_close,

  1678.     .decode         = vorbis_decode_frame,

  1679.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1680.     .channel_layouts = ff_vorbis_channel_layouts,

  1681.     .sample_fmts = (const enum AVSampleFormat[]) {

  1682.         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE

  1683.     },

  1684. };