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FFmpeg/libavcodec/vorbisdec.c

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  1. /**

  2.  * @file

  3.  * Vorbis I decoder

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

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

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

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * Vorbis I decoder

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

  27.  */

  28. 

  29. #include <inttypes.h>

  30. #include <math.h>

  31. 

  32. #define BITSTREAM_READER_LE

  33. #include "libavutil/float_dsp.h"

  34. #include "libavutil/avassert.h"

  35. #include "avcodec.h"

  36. #include "get_bits.h"

  37. #include "dsputil.h"

  38. #include "fft.h"

  39. #include "fmtconvert.h"

  40. #include "internal.h"

  41. 

  42. #include "vorbis.h"

  43. #include "xiph.h"

  44. 

  45. #define V_NB_BITS 8

  46. #define V_NB_BITS2 11

  47. #define V_MAX_VLCS (1 << 16)

  48. #define V_MAX_PARTITIONS (1 << 20)

  49. 

  50. typedef struct {

  51.     uint8_t      dimensions;

  52.     uint8_t      lookup_type;

  53.     uint8_t      maxdepth;

  54.     VLC          vlc;

  55.     float       *codevectors;

  56.     unsigned int nb_bits;

  57. } vorbis_codebook;

  58. 

  59. typedef union  vorbis_floor_u  vorbis_floor_data;

  60. typedef struct vorbis_floor0_s vorbis_floor0;

  61. typedef struct vorbis_floor1_s vorbis_floor1;

  62. struct vorbis_context_s;

  63. typedef

  64. int (* vorbis_floor_decode_func)

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

  66. typedef struct {

  67.     uint8_t floor_type;

  68.     vorbis_floor_decode_func decode;

  69.     union vorbis_floor_u {

  70.         struct vorbis_floor0_s {

  71.             uint8_t       order;

  72.             uint16_t      rate;

  73.             uint16_t      bark_map_size;

  74.             int32_t      *map[2];

  75.             uint32_t      map_size[2];

  76.             uint8_t       amplitude_bits;

  77.             uint8_t       amplitude_offset;

  78.             uint8_t       num_books;

  79.             uint8_t      *book_list;

  80.             float        *lsp;

  81.         } t0;

  82.         struct vorbis_floor1_s {

  83.             uint8_t       partitions;

  84.             uint8_t       partition_class[32];

  85.             uint8_t       class_dimensions[16];

  86.             uint8_t       class_subclasses[16];

  87.             uint8_t       class_masterbook[16];

  88.             int16_t       subclass_books[16][8];

  89.             uint8_t       multiplier;

  90.             uint16_t      x_list_dim;

  91.             vorbis_floor1_entry *list;

  92.         } t1;

  93.     } data;

  94. } vorbis_floor;

  95. 

  96. typedef struct {

  97.     uint16_t      type;

  98.     uint32_t      begin;

  99.     uint32_t      end;

  100.     unsigned      partition_size;

  101.     uint8_t       classifications;

  102.     uint8_t       classbook;

  103.     int16_t       books[64][8];

  104.     uint8_t       maxpass;

  105.     uint16_t      ptns_to_read;

  106.     uint8_t      *classifs;

  107. } vorbis_residue;

  108. 

  109. typedef struct {

  110.     uint8_t       submaps;

  111.     uint16_t      coupling_steps;

  112.     uint8_t      *magnitude;

  113.     uint8_t      *angle;

  114.     uint8_t      *mux;

  115.     uint8_t       submap_floor[16];

  116.     uint8_t       submap_residue[16];

  117. } vorbis_mapping;

  118. 

  119. typedef struct {

  120.     uint8_t       blockflag;

  121.     uint16_t      windowtype;

  122.     uint16_t      transformtype;

  123.     uint8_t       mapping;

  124. } vorbis_mode;

  125. 

  126. typedef struct vorbis_context_s {

  127.     AVCodecContext *avccontext;

  128.     AVFrame frame;

  129.     GetBitContext gb;

  130.     DSPContext dsp;

  131.     AVFloatDSPContext fdsp;

  132.     FmtConvertContext fmt_conv;

  133. 

  134.     FFTContext mdct[2];

  135.     uint8_t       first_frame;

  136.     uint32_t      version;

  137.     uint8_t       audio_channels;

  138.     uint32_t      audio_samplerate;

  139.     uint32_t      bitrate_maximum;

  140.     uint32_t      bitrate_nominal;

  141.     uint32_t      bitrate_minimum;

  142.     uint32_t      blocksize[2];

  143.     const float  *win[2];

  144.     uint16_t      codebook_count;

  145.     vorbis_codebook *codebooks;

  146.     uint8_t       floor_count;

  147.     vorbis_floor *floors;

  148.     uint8_t       residue_count;

  149.     vorbis_residue *residues;

  150.     uint8_t       mapping_count;

  151.     vorbis_mapping *mappings;

  152.     uint8_t       mode_count;

  153.     vorbis_mode  *modes;

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

  155.     uint8_t       previous_window;

  156.     float        *channel_residues;

  157.     float        *saved;

  158. } vorbis_context;

  159. 

  160. /* Helper functions */

  161. 

  162. #define BARK(x) \

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

  164. 

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

  166. #define VALIDATE_INDEX(idx, limit) \

  167.     if (idx >= limit) {\

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

  169.                idx_err_str,\

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

  171.         return AVERROR_INVALIDDATA;\

  172.     }

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

  174.     {\

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

  176.         VALIDATE_INDEX(idx, limit)\

  177.     }

  178. 

  179. static float vorbisfloat2float(unsigned val)

  180. {

  181.     double mant = val & 0x1fffff;

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

  183.     if (val & 0x80000000)

  184.         mant = -mant;

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

  186. }

  187. 

  188. 

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

  190. 

  191. static void vorbis_free(vorbis_context *vc)

  192. {

  193.     int i;

  194. 

  195.     av_freep(&vc->channel_residues);

  196.     av_freep(&vc->saved);

  197. 

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

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

  200.     av_freep(&vc->residues);

  201.     av_freep(&vc->modes);

  202. 

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

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

  205. 

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

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

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

  209.     }

  210.     av_freep(&vc->codebooks);

  211. 

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

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

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

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

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

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

  218.         } else {

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

  220.         }

  221.     }

  222.     av_freep(&vc->floors);

  223. 

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

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

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

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

  228.     }

  229.     av_freep(&vc->mappings);

  230. }

  231. 

  232. // Parse setup header -------------------------------------------------

  233. 

  234. // Process codebooks part

  235. 

  236. static int vorbis_parse_setup_hdr_codebooks(vorbis_context *vc)

  237. {

  238.     unsigned cb;

  239.     uint8_t  *tmp_vlc_bits;

  240.     uint32_t *tmp_vlc_codes;

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

  242.     uint16_t *codebook_multiplicands;

  243.     int ret = 0;

  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.             ret = AVERROR_INVALIDDATA;

  264.             goto error;

  265.         }

  266. 

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

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

  269.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  271.                    cb, codebook_setup->dimensions);

  272.             ret = AVERROR_INVALIDDATA;

  273.             goto error;

  274.         }

  275.         entries = get_bits(gb, 24);

  276.         if (entries > V_MAX_VLCS) {

  277.             av_log(vc->avccontext, AV_LOG_ERROR,

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

  279.                    cb, entries);

  280.             ret = AVERROR_INVALIDDATA;

  281.             goto error;

  282.         }

  283. 

  284.         ordered = get_bits1(gb);

  285. 

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

  287.                 codebook_setup->dimensions, entries);

  288. 

  289.         if (!ordered) {

  290.             unsigned ce, flag;

  291.             unsigned sparse = get_bits1(gb);

  292. 

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

  294. 

  295.             if (sparse) {

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

  297. 

  298.                 used_entries = 0;

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

  300.                     flag = get_bits1(gb);

  301.                     if (flag) {

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

  303.                         ++used_entries;

  304.                     } else

  305.                         tmp_vlc_bits[ce] = 0;

  306.                 }

  307.             } else {

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

  309. 

  310.                 used_entries = entries;

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

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

  313.             }

  314.         } else {

  315.             unsigned current_entry  = 0;

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

  317. 

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

  319. 

  320.             used_entries = entries;

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

  322.                 unsigned i, number;

  323. 

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

  325. 

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

  327. 

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

  329. 

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

  331.                     if (i < used_entries)

  332.                         tmp_vlc_bits[i] = current_length;

  333. 

  334.                 current_entry+=number;

  335.             }

  336.             if (current_entry>used_entries) {

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

  338.                 ret = AVERROR_INVALIDDATA;

  339.                 goto error;

  340.             }

  341.         }

  342. 

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

  344. 

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

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

  347. 

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

  349. 

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

  351.             unsigned i, j, k;

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

  353. 

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

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

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

  357.             unsigned codebook_sequence_p = get_bits1(gb);

  358. 

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

  360.                     codebook_lookup_values);

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

  362.                     codebook_delta_value, codebook_minimum_value);

  363. 

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

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

  366. 

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

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

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

  370.             }

  371. 

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

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

  374.                                                                     codebook_setup->dimensions *

  375.                                                                     sizeof(*codebook_setup->codevectors))

  376.                                                        : NULL;

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

  378.                 unsigned dim = codebook_setup->dimensions;

  379. 

  380.                 if (tmp_vlc_bits[i]) {

  381.                     float last = 0.0;

  382.                     unsigned lookup_offset = i;

  383. 

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

  385. 

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

  387.                         unsigned multiplicand_offset = lookup_offset % codebook_lookup_values;

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

  389.                         if (codebook_sequence_p)

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

  391.                         lookup_offset/=codebook_lookup_values;

  392.                     }

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

  394. 

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

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

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

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

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

  400. 

  401.                     ++j;

  402.                 }

  403.             }

  404.             if (j != used_entries) {

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

  406.                 ret = AVERROR_INVALIDDATA;

  407.                 goto error;

  408.             }

  409.             entries = used_entries;

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

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

  412.             ret = AVERROR_INVALIDDATA;

  413.             goto error;

  414.         }

  415. 

  416. // Initialize VLC table

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

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

  419.             ret = AVERROR_INVALIDDATA;

  420.             goto error;

  421.         }

  422.         codebook_setup->maxdepth = 0;

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

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

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

  426. 

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

  428.             codebook_setup->nb_bits = V_NB_BITS2;

  429.         else

  430.             codebook_setup->nb_bits = V_NB_BITS;

  431. 

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

  433. 

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

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

  436.                             sizeof(*tmp_vlc_bits), tmp_vlc_codes,

  437.                             sizeof(*tmp_vlc_codes), sizeof(*tmp_vlc_codes),

  438.                             INIT_VLC_LE))) {

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

  440.             goto error;

  441.         }

  442.     }

  443. 

  444.     av_free(tmp_vlc_bits);

  445.     av_free(tmp_vlc_codes);

  446.     av_free(codebook_multiplicands);

  447.     return 0;

  448. 

  449. // Error:

  450. error:

  451.     av_free(tmp_vlc_bits);

  452.     av_free(tmp_vlc_codes);

  453.     av_free(codebook_multiplicands);

  454.     return ret;

  455. }

  456. 

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

  458. 

  459. static int vorbis_parse_setup_hdr_tdtransforms(vorbis_context *vc)

  460. {

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

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

  463. 

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

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

  466. 

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

  468.                 vorbis_time_count, vorbis_tdtransform);

  469. 

  470.         if (vorbis_tdtransform) {

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

  472.             return AVERROR_INVALIDDATA;

  473.         }

  474.     }

  475.     return 0;

  476. }

  477. 

  478. // Process floors part

  479. 

  480. static int vorbis_floor0_decode(vorbis_context *vc,

  481.                                 vorbis_floor_data *vfu, float *vec);

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

  483. static int vorbis_floor1_decode(vorbis_context *vc,

  484.                                 vorbis_floor_data *vfu, float *vec);

  485. static int vorbis_parse_setup_hdr_floors(vorbis_context *vc)

  486. {

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

  488.     int i,j,k;

  489. 

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

  491. 

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

  493. 

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

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

  496. 

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

  498. 

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

  500. 

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

  502.             int maximum_class = -1;

  503.             unsigned rangebits, rangemax, floor1_values = 2;

  504. 

  505.             floor_setup->decode = vorbis_floor1_decode;

  506. 

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

  508. 

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

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

  511. 

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

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

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

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

  516. 

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

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

  519. 

  520.             }

  521. 

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

  523. 

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

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

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

  527. 

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

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

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

  531. 

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

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

  534. 

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

  536.                 }

  537. 

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

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

  540.                     if (bits != -1)

  541.                         VALIDATE_INDEX(bits, vc->codebook_count)

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

  543. 

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

  545.                 }

  546.             }

  547. 

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

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

  550. 

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

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

  553. 

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

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

  556. 

  557. 

  558.             rangebits = get_bits(gb, 4);

  559.             rangemax = (1 << rangebits);

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

  561.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

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

  564.                 return AVERROR_INVALIDDATA;

  565.             }

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

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

  568. 

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

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

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

  572. 

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

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

  575.                 }

  576.             }

  577. 

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

  579.             if (ff_vorbis_ready_floor1_list(vc->avccontext,

  580.                                             floor_setup->data.t1.list,

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

  582.                 return AVERROR_INVALIDDATA;

  583.             }

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

  585.             unsigned max_codebook_dim = 0;

  586. 

  587.             floor_setup->decode = vorbis_floor0_decode;

  588. 

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

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

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

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

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

  594.              * 2^0 - 1 == 0                             */

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

  596.                 av_log(vc->avccontext, AV_LOG_ERROR,

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

  598.                 return AVERROR_INVALIDDATA;

  599.             }

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

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

  602. 

  603.             /* allocate mem for booklist */

  604.             floor_setup->data.t0.book_list =

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

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

  607.                 return AVERROR(ENOMEM);

  608.             /* read book indexes */

  609.             {

  610.                 int idx;

  611.                 unsigned book_idx;

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

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

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

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

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

  617.                 }

  618.             }

  619. 

  620.             create_map(vc, i);

  621. 

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

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

  624.             floor_setup->data.t0.lsp =

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

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

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

  628.                 return AVERROR(ENOMEM);

  629. 

  630.             /* debug output parsed headers */

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

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

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

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

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

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

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

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

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

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

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

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

  643.             {

  644.                 int idx;

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

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

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

  648.                 }

  649.             }

  650.         } else {

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

  652.             return AVERROR_INVALIDDATA;

  653.         }

  654.     }

  655.     return 0;

  656. }

  657. 

  658. // Process residues part

  659. 

  660. static int vorbis_parse_setup_hdr_residues(vorbis_context *vc)

  661. {

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

  663.     unsigned i, j, k;

  664. 

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

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

  667. 

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

  669. 

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

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

  672.         uint8_t cascade[64];

  673.         unsigned high_bits, low_bits;

  674. 

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

  676. 

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

  678. 

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

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

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

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

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

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

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

  686.             av_log(vc->avccontext, AV_LOG_ERROR,

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

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

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

  690.             return AVERROR_INVALIDDATA;

  691.         }

  692. 

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

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

  695. 

  696.         res_setup->ptns_to_read =

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

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

  699.                                         vc->audio_channels *

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

  701.         if (!res_setup->classifs)

  702.             return AVERROR(ENOMEM);

  703. 

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

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

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

  707. 

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

  709.             high_bits = 0;

  710.             low_bits  = get_bits(gb, 3);

  711.             if (get_bits1(gb))

  712.                 high_bits = get_bits(gb, 5);

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

  714. 

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

  716.         }

  717. 

  718.         res_setup->maxpass = 0;

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

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

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

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

  723. 

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

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

  726. 

  727.                     if (k>res_setup->maxpass)

  728.                         res_setup->maxpass = k;

  729.                 } else {

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

  731.                 }

  732.             }

  733.         }

  734.     }

  735.     return 0;

  736. }

  737. 

  738. // Process mappings part

  739. 

  740. static int vorbis_parse_setup_hdr_mappings(vorbis_context *vc)

  741. {

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

  743.     unsigned i, j;

  744. 

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

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

  747. 

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

  749. 

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

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

  752. 

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

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

  755.             return AVERROR_INVALIDDATA;

  756.         }

  757.         if (get_bits1(gb)) {

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

  759.         } else {

  760.             mapping_setup->submaps = 1;

  761.         }

  762. 

  763.         if (get_bits1(gb)) {

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

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

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

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

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

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

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

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

  772.             }

  773.         } else {

  774.             mapping_setup->coupling_steps = 0;

  775.         }

  776. 

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

  778.                 i, mapping_setup->coupling_steps);

  779. 

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

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

  782.             return AVERROR_INVALIDDATA; // following spec.

  783.         }

  784. 

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

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

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

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

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

  790.         }

  791. 

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

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

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

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

  796. 

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

  798.                     mapping_setup->submap_floor[j],

  799.                     mapping_setup->submap_residue[j]);

  800.         }

  801.     }

  802.     return 0;

  803. }

  804. 

  805. // Process modes part

  806. 

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

  808. {

  809.     vorbis_floor *floors = vc->floors;

  810.     vorbis_floor0 *vf;

  811.     int idx;

  812.     int blockflag, n;

  813.     int32_t *map;

  814. 

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

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

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

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

  819. 

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

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

  822. 

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

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

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

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

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

  828.         }

  829.         map[n] = -1;

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

  831.     }

  832. 

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

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

  835.     }

  836. }

  837. 

  838. static int vorbis_parse_setup_hdr_modes(vorbis_context *vc)

  839. {

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

  841.     unsigned i;

  842. 

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

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

  845. 

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

  847. 

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

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

  850. 

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

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

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

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

  855. 

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

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

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

  859.     }

  860.     return 0;

  861. }

  862. 

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

  864. 

  865. static int vorbis_parse_setup_hdr(vorbis_context *vc)

  866. {

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

  868.     int ret;

  869. 

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

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

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

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

  874.         return AVERROR_INVALIDDATA;

  875.     }

  876. 

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

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

  879.         return ret;

  880.     }

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

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

  883.         return ret;

  884.     }

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

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

  887.         return ret;

  888.     }

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

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

  891.         return ret;

  892.     }

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

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

  895.         return ret;

  896.     }

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

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

  899.         return ret;

  900.     }

  901.     if (!get_bits1(gb)) {

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

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

  904.     }

  905. 

  906.     return 0;

  907. }

  908. 

  909. // Process the identification header

  910. 

  911. static int vorbis_parse_id_hdr(vorbis_context *vc)

  912. {

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

  914.     unsigned bl0, bl1;

  915. 

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

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

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

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

  920.         return AVERROR_INVALIDDATA;

  921.     }

  922. 

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

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

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

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

  927.         return AVERROR_INVALIDDATA;

  928.     }

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

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

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

  932.         return AVERROR_INVALIDDATA;

  933.     }

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

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

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

  937.     bl0 = get_bits(gb, 4);

  938.     bl1 = get_bits(gb, 4);

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

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

  941.         return AVERROR_INVALIDDATA;

  942.     }

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

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

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

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

  947. 

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

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

  950.         return AVERROR_INVALIDDATA;

  951.     }

  952. 

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

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

  955.     vc->previous_window  = 0;

  956. 

  957.     ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0);

  958.     ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0);

  959. 

  960.     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 ",

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

  962. 

  963. /*

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

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

  966.         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)));

  967.     }

  968. */

  969. 

  970.     return 0;

  971. }

  972. 

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

  974. 

  975. static av_cold int vorbis_decode_init(AVCodecContext *avccontext)

  976. {

  977.     vorbis_context *vc = avccontext->priv_data;

  978.     uint8_t *headers   = avccontext->extradata;

  979.     int headers_len    = avccontext->extradata_size;

  980.     uint8_t *header_start[3];

  981.     int header_len[3];

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

  983.     int hdr_type, ret;

  984. 

  985.     vc->avccontext = avccontext;

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

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

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

  989. 

  990.     avccontext->sample_fmt = AV_SAMPLE_FMT_FLTP;

  991. 

  992.     if (!headers_len) {

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

  994.         return AVERROR_INVALIDDATA;

  995.     }

  996. 

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

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

  999.         return ret;

  1000.     }

  1001. 

  1002.     init_get_bits(gb, header_start[0], header_len[0]*8);

  1003.     hdr_type = get_bits(gb, 8);

  1004.     if (hdr_type != 1) {

  1005.         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");

  1006.         return AVERROR_INVALIDDATA;

  1007.     }

  1008.     if ((ret = vorbis_parse_id_hdr(vc))) {

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

  1010.         vorbis_free(vc);

  1011.         return ret;

  1012.     }

  1013. 

  1014.     init_get_bits(gb, header_start[2], header_len[2]*8);

  1015.     hdr_type = get_bits(gb, 8);

  1016.     if (hdr_type != 5) {

  1017.         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");

  1018.         vorbis_free(vc);

  1019.         return AVERROR_INVALIDDATA;

  1020.     }

  1021.     if ((ret = vorbis_parse_setup_hdr(vc))) {

  1022.         av_log(avccontext, AV_LOG_ERROR, "Setup header corrupt.\n");

  1023.         vorbis_free(vc);

  1024.         return ret;

  1025.     }

  1026. 

  1027.     if (vc->audio_channels > 8)

  1028.         avccontext->channel_layout = 0;

  1029.     else

  1030.         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];

  1031. 

  1032.     avccontext->channels    = vc->audio_channels;

  1033.     avccontext->sample_rate = vc->audio_samplerate;

  1034. 

  1035.     avcodec_get_frame_defaults(&vc->frame);

  1036.     avccontext->coded_frame = &vc->frame;

  1037. 

  1038.     return 0;

  1039. }

  1040. 

  1041. // Decode audiopackets -------------------------------------------------

  1042. 

  1043. // Read and decode floor

  1044. 

  1045. static int vorbis_floor0_decode(vorbis_context *vc,

  1046.                                 vorbis_floor_data *vfu, float *vec)

  1047. {

  1048.     vorbis_floor0 *vf = &vfu->t0;

  1049.     float *lsp = vf->lsp;

  1050.     unsigned amplitude, book_idx;

  1051.     unsigned blockflag = vc->modes[vc->mode_number].blockflag;

  1052. 

  1053.     amplitude = get_bits(&vc->gb, vf->amplitude_bits);

  1054.     if (amplitude > 0) {

  1055.         float last = 0;

  1056.         unsigned idx, lsp_len = 0;

  1057.         vorbis_codebook codebook;

  1058. 

  1059.         book_idx = get_bits(&vc->gb, ilog(vf->num_books));

  1060.         if (book_idx >= vf->num_books) {

  1061.             av_log(vc->avccontext, AV_LOG_ERROR,

  1062.                     "floor0 dec: booknumber too high!\n");

  1063.             book_idx =  0;

  1064.         }

  1065.         av_dlog(NULL, "floor0 dec: booknumber: %u\n", book_idx);

  1066.         codebook = vc->codebooks[vf->book_list[book_idx]];

  1067.         /* Invalid codebook! */

  1068.         if (!codebook.codevectors)

  1069.             return AVERROR_INVALIDDATA;

  1070. 

  1071.         while (lsp_len<vf->order) {

  1072.             int vec_off;

  1073. 

  1074.             av_dlog(NULL, "floor0 dec: book dimension: %d\n", codebook.dimensions);

  1075.             av_dlog(NULL, "floor0 dec: maximum depth: %d\n", codebook.maxdepth);

  1076.             /* read temp vector */

  1077.             vec_off = get_vlc2(&vc->gb, codebook.vlc.table,

  1078.                                codebook.nb_bits, codebook.maxdepth)

  1079.                       * codebook.dimensions;

  1080.             av_dlog(NULL, "floor0 dec: vector offset: %d\n", vec_off);

  1081.             /* copy each vector component and add last to it */

  1082.             for (idx = 0; idx < codebook.dimensions; ++idx)

  1083.                 lsp[lsp_len+idx] = codebook.codevectors[vec_off+idx] + last;

  1084.             last = lsp[lsp_len+idx-1]; /* set last to last vector component */

  1085. 

  1086.             lsp_len += codebook.dimensions;

  1087.         }

  1088.         /* DEBUG: output lsp coeffs */

  1089.         {

  1090.             int idx;

  1091.             for (idx = 0; idx < lsp_len; ++idx)

  1092.                 av_dlog(NULL, "floor0 dec: coeff at %d is %f\n", idx, lsp[idx]);

  1093.         }

  1094. 

  1095.         /* synthesize floor output vector */

  1096.         {

  1097.             int i;

  1098.             int order = vf->order;

  1099.             float wstep = M_PI / vf->bark_map_size;

  1100. 

  1101.             for (i = 0; i < order; i++)

  1102.                 lsp[i] = 2.0f * cos(lsp[i]);

  1103. 

  1104.             av_dlog(NULL, "floor0 synth: map_size = %"PRIu32"; m = %d; wstep = %f\n",

  1105.                     vf->map_size[blockflag], order, wstep);

  1106. 

  1107.             i = 0;

  1108.             while (i < vf->map_size[blockflag]) {

  1109.                 int j, iter_cond = vf->map[blockflag][i];

  1110.                 float p = 0.5f;

  1111.                 float q = 0.5f;

  1112.                 float two_cos_w = 2.0f * cos(wstep * iter_cond); // needed all times

  1113. 

  1114.                 /* similar part for the q and p products */

  1115.                 for (j = 0; j + 1 < order; j += 2) {

  1116.                     q *= lsp[j]     - two_cos_w;

  1117.                     p *= lsp[j + 1] - two_cos_w;

  1118.                 }

  1119.                 if (j == order) { // even order

  1120.                     p *= p * (2.0f - two_cos_w);

  1121.                     q *= q * (2.0f + two_cos_w);

  1122.                 } else { // odd order

  1123.                     q *= two_cos_w-lsp[j]; // one more time for q

  1124. 

  1125.                     /* final step and square */

  1126.                     p *= p * (4.f - two_cos_w * two_cos_w);

  1127.                     q *= q;

  1128.                 }

  1129. 

  1130.                 /* calculate linear floor value */

  1131.                 q = exp((((amplitude*vf->amplitude_offset) /

  1132.                           (((1 << vf->amplitude_bits) - 1) * sqrt(p + q)))

  1133.                          - vf->amplitude_offset) * .11512925f);

  1134. 

  1135.                 /* fill vector */

  1136.                 do {

  1137.                     vec[i] = q; ++i;

  1138.                 } while (vf->map[blockflag][i] == iter_cond);

  1139.             }

  1140.         }

  1141.     } else {

  1142.         /* this channel is unused */

  1143.         return 1;

  1144.     }

  1145. 

  1146.     av_dlog(NULL, " Floor0 decoded\n");

  1147. 

  1148.     return 0;

  1149. }

  1150. 

  1151. static int vorbis_floor1_decode(vorbis_context *vc,

  1152.                                 vorbis_floor_data *vfu, float *vec)

  1153. {

  1154.     vorbis_floor1 *vf = &vfu->t1;

  1155.     GetBitContext *gb = &vc->gb;

  1156.     uint16_t range_v[4] = { 256, 128, 86, 64 };

  1157.     unsigned range = range_v[vf->multiplier - 1];

  1158.     uint16_t floor1_Y[258];

  1159.     uint16_t floor1_Y_final[258];

  1160.     int floor1_flag[258];

  1161.     unsigned partition_class, cdim, cbits, csub, cval, offset, i, j;

  1162.     int book, adx, ady, dy, off, predicted, err;

  1163. 

  1164. 

  1165.     if (!get_bits1(gb)) // silence

  1166.         return 1;

  1167. 

  1168. // Read values (or differences) for the floor's points

  1169. 

  1170.     floor1_Y[0] = get_bits(gb, ilog(range - 1));

  1171.     floor1_Y[1] = get_bits(gb, ilog(range - 1));

  1172. 

  1173.     av_dlog(NULL, "floor 0 Y %d floor 1 Y %d \n", floor1_Y[0], floor1_Y[1]);

  1174. 

  1175.     offset = 2;

  1176.     for (i = 0; i < vf->partitions; ++i) {

  1177.         partition_class = vf->partition_class[i];

  1178.         cdim   = vf->class_dimensions[partition_class];

  1179.         cbits  = vf->class_subclasses[partition_class];

  1180.         csub = (1 << cbits) - 1;

  1181.         cval = 0;

  1182. 

  1183.         av_dlog(NULL, "Cbits %u\n", cbits);

  1184. 

  1185.         if (cbits) // this reads all subclasses for this partition's class

  1186.             cval = get_vlc2(gb, vc->codebooks[vf->class_masterbook[partition_class]].vlc.table,

  1187.                             vc->codebooks[vf->class_masterbook[partition_class]].nb_bits, 3);

  1188. 

  1189.         for (j = 0; j < cdim; ++j) {

  1190.             book = vf->subclass_books[partition_class][cval & csub];

  1191. 

  1192.             av_dlog(NULL, "book %d Cbits %u cval %u  bits:%d\n",

  1193.                     book, cbits, cval, get_bits_count(gb));

  1194. 

  1195.             cval = cval >> cbits;

  1196.             if (book > -1) {

  1197.                 floor1_Y[offset+j] = get_vlc2(gb, vc->codebooks[book].vlc.table,

  1198.                 vc->codebooks[book].nb_bits, 3);

  1199.             } else {

  1200.                 floor1_Y[offset+j] = 0;

  1201.             }

  1202. 

  1203.             av_dlog(NULL, " floor(%d) = %d \n",

  1204.                     vf->list[offset+j].x, floor1_Y[offset+j]);

  1205.         }

  1206.         offset+=cdim;

  1207.     }

  1208. 

  1209. // Amplitude calculation from the differences

  1210. 

  1211.     floor1_flag[0] = 1;

  1212.     floor1_flag[1] = 1;

  1213.     floor1_Y_final[0] = floor1_Y[0];

  1214.     floor1_Y_final[1] = floor1_Y[1];

  1215. 

  1216.     for (i = 2; i < vf->x_list_dim; ++i) {

  1217.         unsigned val, highroom, lowroom, room, high_neigh_offs, low_neigh_offs;

  1218. 

  1219.         low_neigh_offs  = vf->list[i].low;

  1220.         high_neigh_offs = vf->list[i].high;

  1221.         dy  = floor1_Y_final[high_neigh_offs] - floor1_Y_final[low_neigh_offs];  // render_point begin

  1222.         adx = vf->list[high_neigh_offs].x - vf->list[low_neigh_offs].x;

  1223.         ady = FFABS(dy);

  1224.         err = ady * (vf->list[i].x - vf->list[low_neigh_offs].x);

  1225.         off = err / adx;

  1226.         if (dy < 0) {

  1227.             predicted = floor1_Y_final[low_neigh_offs] - off;

  1228.         } else {

  1229.             predicted = floor1_Y_final[low_neigh_offs] + off;

  1230.         } // render_point end

  1231. 

  1232.         val = floor1_Y[i];

  1233.         highroom = range-predicted;

  1234.         lowroom  = predicted;

  1235.         if (highroom < lowroom) {

  1236.             room = highroom * 2;

  1237.         } else {

  1238.             room = lowroom * 2;   // SPEC misspelling

  1239.         }

  1240.         if (val) {

  1241.             floor1_flag[low_neigh_offs]  = 1;

  1242.             floor1_flag[high_neigh_offs] = 1;

  1243.             floor1_flag[i]               = 1;

  1244.             if (val >= room) {

  1245.                 if (highroom > lowroom) {

  1246.                     floor1_Y_final[i] = av_clip_uint16(val - lowroom + predicted);

  1247.                 } else {

  1248.                     floor1_Y_final[i] = av_clip_uint16(predicted - val + highroom - 1);

  1249.                 }

  1250.             } else {

  1251.                 if (val & 1) {

  1252.                     floor1_Y_final[i] = av_clip_uint16(predicted - (val + 1) / 2);

  1253.                 } else {

  1254.                     floor1_Y_final[i] = av_clip_uint16(predicted + val / 2);

  1255.                 }

  1256.             }

  1257.         } else {

  1258.             floor1_flag[i]    = 0;

  1259.             floor1_Y_final[i] = av_clip_uint16(predicted);

  1260.         }

  1261. 

  1262.         av_dlog(NULL, " Decoded floor(%d) = %u / val %u\n",

  1263.                 vf->list[i].x, floor1_Y_final[i], val);

  1264.     }

  1265. 

  1266. // Curve synth - connect the calculated dots and convert from dB scale FIXME optimize ?

  1267. 

  1268.     ff_vorbis_floor1_render_list(vf->list, vf->x_list_dim, floor1_Y_final, floor1_flag, vf->multiplier, vec, vf->list[1].x);

  1269. 

  1270.     av_dlog(NULL, " Floor decoded\n");

  1271. 

  1272.     return 0;

  1273. }

  1274. 

  1275. // Read and decode residue

  1276. 

  1277. static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc,

  1278.                                                            vorbis_residue *vr,

  1279.                                                            unsigned ch,

  1280.                                                            uint8_t *do_not_decode,

  1281.                                                            float *vec,

  1282.                                                            unsigned vlen,

  1283.                                                            unsigned ch_left,

  1284.                                                            int vr_type)

  1285. {

  1286.     GetBitContext *gb = &vc->gb;

  1287.     unsigned c_p_c        = vc->codebooks[vr->classbook].dimensions;

  1288.     unsigned ptns_to_read = vr->ptns_to_read;

  1289.     uint8_t *classifs = vr->classifs;

  1290.     unsigned pass, ch_used, i, j, k, l;

  1291.     unsigned max_output = (ch - 1) * vlen;

  1292. 

  1293.     if (vr_type == 2) {

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

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

  1296.         if (do_not_decode[0])

  1297.             return 0;

  1298.         ch_used = 1;

  1299.         max_output += vr->end / ch;

  1300.     } else {

  1301.         ch_used = ch;

  1302.         max_output += vr->end;

  1303.     }

  1304. 

  1305.     if (max_output > ch_left * vlen) {

  1306.         av_log(vc->avccontext, AV_LOG_ERROR, "Insufficient output buffer\n");

  1307.         return -1;

  1308.     }

  1309. 

  1310.     av_dlog(NULL, " residue type 0/1/2 decode begin, ch: %d  cpc %d  \n", ch, c_p_c);

  1311. 

  1312.     for (pass = 0; pass <= vr->maxpass; ++pass) { // FIXME OPTIMIZE?

  1313.         uint16_t voffset, partition_count, j_times_ptns_to_read;

  1314. 

  1315.         voffset = vr->begin;

  1316.         for (partition_count = 0; partition_count < ptns_to_read;) {  // SPEC        error

  1317.             if (!pass) {

  1318.                 unsigned inverse_class = ff_inverse[vr->classifications];

  1319.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1320.                     if (!do_not_decode[j]) {

  1321.                         unsigned temp = get_vlc2(gb, vc->codebooks[vr->classbook].vlc.table,

  1322.                                                  vc->codebooks[vr->classbook].nb_bits, 3);

  1323. 

  1324.                         av_dlog(NULL, "Classword: %u\n", temp);

  1325. 

  1326.                         av_assert0(vr->classifications > 1 && temp <= 65536); //needed for inverse[]

  1327.                         for (i = 0; i < c_p_c; ++i) {

  1328.                             unsigned temp2;

  1329. 

  1330.                             temp2 = (((uint64_t)temp) * inverse_class) >> 32;

  1331.                             if (partition_count + c_p_c - 1 - i < ptns_to_read)

  1332.                                 classifs[j_times_ptns_to_read + partition_count + c_p_c - 1 - i] = temp - temp2 * vr->classifications;

  1333.                             temp = temp2;

  1334.                         }

  1335.                     }

  1336.                     j_times_ptns_to_read += ptns_to_read;

  1337.                 }

  1338.             }

  1339.             for (i = 0; (i < c_p_c) && (partition_count < ptns_to_read); ++i) {

  1340.                 for (j_times_ptns_to_read = 0, j = 0; j < ch_used; ++j) {

  1341.                     unsigned voffs;

  1342. 

  1343.                     if (!do_not_decode[j]) {

  1344.                         unsigned vqclass = classifs[j_times_ptns_to_read + partition_count];

  1345.                         int vqbook  = vr->books[vqclass][pass];

  1346. 

  1347.                         if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) {

  1348.                             unsigned coffs;

  1349.                             unsigned dim  = vc->codebooks[vqbook].dimensions;

  1350.                             unsigned step = FASTDIV(vr->partition_size << 1, dim << 1);

  1351.                             vorbis_codebook codebook = vc->codebooks[vqbook];

  1352. 

  1353.                             if (vr_type == 0) {

  1354. 

  1355.                                 voffs = voffset+j*vlen;

  1356.                                 for (k = 0; k < step; ++k) {

  1357.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1358.                                     for (l = 0; l < dim; ++l)

  1359.                                         vec[voffs + k + l * step] += codebook.codevectors[coffs + l];

  1360.                                 }

  1361.                             } else if (vr_type == 1) {

  1362.                                 voffs = voffset + j * vlen;

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

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

  1365.                                     for (l = 0; l < dim; ++l, ++voffs) {

  1366.                                         vec[voffs]+=codebook.codevectors[coffs+l];

  1367. 

  1368.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d  \n",

  1369.                                                 pass, voffs, vec[voffs], codebook.codevectors[coffs+l], coffs);

  1370.                                     }

  1371.                                 }

  1372.                             } else if (vr_type == 2 && ch == 2 && (voffset & 1) == 0 && (dim & 1) == 0) { // most frequent case optimized

  1373.                                 voffs = voffset >> 1;

  1374. 

  1375.                                 if (dim == 2) {

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

  1377.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2;

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

  1379.                                         vec[voffs + k + vlen] += codebook.codevectors[coffs + 1];

  1380.                                     }

  1381.                                 } else if (dim == 4) {

  1382.                                     for (k = 0; k < step; ++k, voffs += 2) {

  1383.                                         coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4;

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

  1385.                                         vec[voffs + 1       ] += codebook.codevectors[coffs + 2];

  1386.                                         vec[voffs + vlen    ] += codebook.codevectors[coffs + 1];

  1387.                                         vec[voffs + vlen + 1] += codebook.codevectors[coffs + 3];

  1388.                                     }

  1389.                                 } else

  1390.                                 for (k = 0; k < step; ++k) {

  1391.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1392.                                     for (l = 0; l < dim; l += 2, voffs++) {

  1393.                                         vec[voffs       ] += codebook.codevectors[coffs + l    ];

  1394.                                         vec[voffs + vlen] += codebook.codevectors[coffs + l + 1];

  1395. 

  1396.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1397.                                                 pass, voffset / ch + (voffs % ch) * vlen,

  1398.                                                 vec[voffset / ch + (voffs % ch) * vlen],

  1399.                                                 codebook.codevectors[coffs + l], coffs, l);

  1400.                                     }

  1401.                                 }

  1402. 

  1403.                             } else if (vr_type == 2) {

  1404.                                 unsigned voffs_div = FASTDIV(voffset << 1, ch <<1);

  1405.                                 unsigned voffs_mod = voffset - voffs_div * ch;

  1406. 

  1407.                                 for (k = 0; k < step; ++k) {

  1408.                                     coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim;

  1409.                                     for (l = 0; l < dim; ++l) {

  1410.                                         vec[voffs_div + voffs_mod * vlen] +=

  1411.                                             codebook.codevectors[coffs + l];

  1412. 

  1413.                                         av_dlog(NULL, " pass %d offs: %d curr: %f change: %f cv offs.: %d+%d  \n",

  1414.                                                 pass, voffs_div + voffs_mod * vlen,

  1415.                                                 vec[voffs_div + voffs_mod * vlen],

  1416.                                                 codebook.codevectors[coffs + l], coffs, l);

  1417. 

  1418.                                         if (++voffs_mod == ch) {

  1419.                                             voffs_div++;

  1420.                                             voffs_mod = 0;

  1421.                                         }

  1422.                                     }

  1423.                                 }

  1424.                             }

  1425.                         }

  1426.                     }

  1427.                     j_times_ptns_to_read += ptns_to_read;

  1428.                 }

  1429.                 ++partition_count;

  1430.                 voffset += vr->partition_size;

  1431.             }

  1432.         }

  1433.     }

  1434.     return 0;

  1435. }

  1436. 

  1437. static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,

  1438.                                         unsigned ch,

  1439.                                         uint8_t *do_not_decode,

  1440.                                         float *vec, unsigned vlen,

  1441.                                         unsigned ch_left)

  1442. {

  1443.     if (vr->type == 2)

  1444.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 2);

  1445.     else if (vr->type == 1)

  1446.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 1);

  1447.     else if (vr->type == 0)

  1448.         return vorbis_residue_decode_internal(vc, vr, ch, do_not_decode, vec, vlen, ch_left, 0);

  1449.     else {

  1450.         av_log(vc->avccontext, AV_LOG_ERROR, " Invalid residue type while residue decode?! \n");

  1451.         return AVERROR_INVALIDDATA;

  1452.     }

  1453. }

  1454. 

  1455. void ff_vorbis_inverse_coupling(float *mag, float *ang, int blocksize)

  1456. {

  1457.     int i;

  1458.     for (i = 0;  i < blocksize;  i++) {

  1459.         if (mag[i] > 0.0) {

  1460.             if (ang[i] > 0.0) {

  1461.                 ang[i] = mag[i] - ang[i];

  1462.             } else {

  1463.                 float temp = ang[i];

  1464.                 ang[i]     = mag[i];

  1465.                 mag[i]    += temp;

  1466.             }

  1467.         } else {

  1468.             if (ang[i] > 0.0) {

  1469.                 ang[i] += mag[i];

  1470.             } else {

  1471.                 float temp = ang[i];

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

  1473.                 mag[i]    -= temp;

  1474.             }

  1475.         }

  1476.     }

  1477. }

  1478. 

  1479. // Decode the audio packet using the functions above

  1480. 

  1481. static int vorbis_parse_audio_packet(vorbis_context *vc, float **floor_ptr)

  1482. {

  1483.     GetBitContext *gb = &vc->gb;

  1484.     FFTContext *mdct;

  1485.     unsigned previous_window = vc->previous_window;

  1486.     unsigned mode_number, blockflag, blocksize;

  1487.     int i, j;

  1488.     uint8_t no_residue[255];

  1489.     uint8_t do_not_decode[255];

  1490.     vorbis_mapping *mapping;

  1491.     float *ch_res_ptr   = vc->channel_residues;

  1492.     uint8_t res_chan[255];

  1493.     unsigned res_num = 0;

  1494.     int retlen  = 0;

  1495.     unsigned ch_left = vc->audio_channels;

  1496.     unsigned vlen;

  1497. 

  1498.     if (get_bits1(gb)) {

  1499.         av_log(vc->avccontext, AV_LOG_ERROR, "Not a Vorbis I audio packet.\n");

  1500.         return AVERROR_INVALIDDATA; // packet type not audio

  1501.     }

  1502. 

  1503.     if (vc->mode_count == 1) {

  1504.         mode_number = 0;

  1505.     } else {

  1506.         GET_VALIDATED_INDEX(mode_number, ilog(vc->mode_count-1), vc->mode_count)

  1507.     }

  1508.     vc->mode_number = mode_number;

  1509.     mapping = &vc->mappings[vc->modes[mode_number].mapping];

  1510. 

  1511.     av_dlog(NULL, " Mode number: %u , mapping: %d , blocktype %d\n", mode_number,

  1512.             vc->modes[mode_number].mapping, vc->modes[mode_number].blockflag);

  1513. 

  1514.     blockflag = vc->modes[mode_number].blockflag;

  1515.     blocksize = vc->blocksize[blockflag];

  1516.     vlen = blocksize / 2;

  1517.     if (blockflag) {

  1518.         previous_window = get_bits(gb, 1);

  1519.         skip_bits1(gb); // next_window

  1520.     }

  1521. 

  1522.     memset(ch_res_ptr,   0, sizeof(float) * vc->audio_channels * vlen); //FIXME can this be removed ?

  1523.     for (i = 0; i < vc->audio_channels; ++i)

  1524.         memset(floor_ptr[i], 0, vlen * sizeof(floor_ptr[0][0])); //FIXME can this be removed ?

  1525. 

  1526. // Decode floor

  1527. 

  1528.     for (i = 0; i < vc->audio_channels; ++i) {

  1529.         vorbis_floor *floor;

  1530.         int ret;

  1531.         if (mapping->submaps > 1) {

  1532.             floor = &vc->floors[mapping->submap_floor[mapping->mux[i]]];

  1533.         } else {

  1534.             floor = &vc->floors[mapping->submap_floor[0]];

  1535.         }

  1536. 

  1537.         ret = floor->decode(vc, &floor->data, floor_ptr[i]);

  1538. 

  1539.         if (ret < 0) {

  1540.             av_log(vc->avccontext, AV_LOG_ERROR, "Invalid codebook in vorbis_floor_decode.\n");

  1541.             return AVERROR_INVALIDDATA;

  1542.         }

  1543.         no_residue[i] = ret;

  1544.     }

  1545. 

  1546. // Nonzero vector propagate

  1547. 

  1548.     for (i = mapping->coupling_steps - 1; i >= 0; --i) {

  1549.         if (!(no_residue[mapping->magnitude[i]] & no_residue[mapping->angle[i]])) {

  1550.             no_residue[mapping->magnitude[i]] = 0;

  1551.             no_residue[mapping->angle[i]]     = 0;

  1552.         }

  1553.     }

  1554. 

  1555. // Decode residue

  1556. 

  1557.     for (i = 0; i < mapping->submaps; ++i) {

  1558.         vorbis_residue *residue;

  1559.         unsigned ch = 0;

  1560.         int ret;

  1561. 

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

  1563.             if ((mapping->submaps == 1) || (i == mapping->mux[j])) {

  1564.                 res_chan[j] = res_num;

  1565.                 if (no_residue[j]) {

  1566.                     do_not_decode[ch] = 1;

  1567.                 } else {

  1568.                     do_not_decode[ch] = 0;

  1569.                 }

  1570.                 ++ch;

  1571.                 ++res_num;

  1572.             }

  1573.         }

  1574.         residue = &vc->residues[mapping->submap_residue[i]];

  1575.         if (ch_left < ch) {

  1576.             av_log(vc->avccontext, AV_LOG_ERROR, "Too many channels in vorbis_floor_decode.\n");

  1577.             return -1;

  1578.         }

  1579.         if (ch) {

  1580.             ret = vorbis_residue_decode(vc, residue, ch, do_not_decode, ch_res_ptr, vlen, ch_left);

  1581.             if (ret < 0)

  1582.                 return ret;

  1583.         }

  1584. 

  1585.         ch_res_ptr += ch * vlen;

  1586.         ch_left -= ch;

  1587.     }

  1588. 

  1589.     if (ch_left > 0)

  1590.         return AVERROR_INVALIDDATA;

  1591. 

  1592. // Inverse coupling

  1593. 

  1594.     for (i = mapping->coupling_steps - 1; i >= 0; --i) { //warning: i has to be signed

  1595.         float *mag, *ang;

  1596. 

  1597.         mag = vc->channel_residues+res_chan[mapping->magnitude[i]] * blocksize / 2;

  1598.         ang = vc->channel_residues+res_chan[mapping->angle[i]]     * blocksize / 2;

  1599.         vc->dsp.vorbis_inverse_coupling(mag, ang, blocksize / 2);

  1600.     }

  1601. 

  1602. // Dotproduct, MDCT

  1603. 

  1604.     mdct = &vc->mdct[blockflag];

  1605. 

  1606.     for (j = vc->audio_channels-1;j >= 0; j--) {

  1607.         ch_res_ptr   = vc->channel_residues + res_chan[j] * blocksize / 2;

  1608.         vc->fdsp.vector_fmul(floor_ptr[j], floor_ptr[j], ch_res_ptr, blocksize / 2);

  1609.         mdct->imdct_half(mdct, ch_res_ptr, floor_ptr[j]);

  1610.     }

  1611. 

  1612. // Overlap/add, save data for next overlapping

  1613. 

  1614.     retlen = (blocksize + vc->blocksize[previous_window]) / 4;

  1615.     for (j = 0; j < vc->audio_channels; j++) {

  1616.         unsigned bs0 = vc->blocksize[0];

  1617.         unsigned bs1 = vc->blocksize[1];

  1618.         float *residue    = vc->channel_residues + res_chan[j] * blocksize / 2;

  1619.         float *saved      = vc->saved + j * bs1 / 4;

  1620.         float *ret        = floor_ptr[j];

  1621.         float *buf        = residue;

  1622.         const float *win  = vc->win[blockflag & previous_window];

  1623. 

  1624.         if (blockflag == previous_window) {

  1625.             vc->dsp.vector_fmul_window(ret, saved, buf, win, blocksize / 4);

  1626.         } else if (blockflag > previous_window) {

  1627.             vc->dsp.vector_fmul_window(ret, saved, buf, win, bs0 / 4);

  1628.             memcpy(ret+bs0/2, buf+bs0/4, ((bs1-bs0)/4) * sizeof(float));

  1629.         } else {

  1630.             memcpy(ret, saved, ((bs1 - bs0) / 4) * sizeof(float));

  1631.             vc->dsp.vector_fmul_window(ret + (bs1 - bs0) / 4, saved + (bs1 - bs0) / 4, buf, win, bs0 / 4);

  1632.         }

  1633.         memcpy(saved, buf + blocksize / 4, blocksize / 4 * sizeof(float));

  1634.     }

  1635. 

  1636.     vc->previous_window = blockflag;

  1637.     return retlen;

  1638. }

  1639. 

  1640. // Return the decoded audio packet through the standard api

  1641. 

  1642. static int vorbis_decode_frame(AVCodecContext *avccontext, void *data,

  1643.                                int *got_frame_ptr, AVPacket *avpkt)

  1644. {

  1645.     const uint8_t *buf = avpkt->data;

  1646.     int buf_size       = avpkt->size;

  1647.     vorbis_context *vc = avccontext->priv_data;

  1648.     GetBitContext *gb = &vc->gb;

  1649.     float *channel_ptrs[255];

  1650.     int i, len, ret;

  1651. 

  1652.     av_dlog(NULL, "packet length %d \n", buf_size);

  1653. 

  1654.     /* get output buffer */

  1655.     vc->frame.nb_samples = vc->blocksize[1] / 2;

  1656.     if ((ret = ff_get_buffer(avccontext, &vc->frame)) < 0) {

  1657.         av_log(avccontext, AV_LOG_ERROR, "get_buffer() failed\n");

  1658.         return ret;

  1659.     }

  1660. 

  1661.     if (vc->audio_channels > 8) {

  1662.         for (i = 0; i < vc->audio_channels; i++)

  1663.             channel_ptrs[i] = (float *)vc->frame.extended_data[i];

  1664.     } else {

  1665.         for (i = 0; i < vc->audio_channels; i++) {

  1666.             int ch = ff_vorbis_channel_layout_offsets[vc->audio_channels - 1][i];

  1667.             channel_ptrs[ch] = (float *)vc->frame.extended_data[i];

  1668.         }

  1669.     }

  1670. 

  1671.     init_get_bits(gb, buf, buf_size*8);

  1672. 

  1673.     if ((len = vorbis_parse_audio_packet(vc, channel_ptrs)) <= 0)

  1674.         return len;

  1675. 

  1676.     if (!vc->first_frame) {

  1677.         vc->first_frame = 1;

  1678.         *got_frame_ptr = 0;

  1679.         return buf_size;

  1680.     }

  1681. 

  1682.     av_dlog(NULL, "parsed %d bytes %d bits, returned %d samples (*ch*bits) \n",

  1683.             get_bits_count(gb) / 8, get_bits_count(gb) % 8, len);

  1684. 

  1685.     vc->frame.nb_samples = len;

  1686.     *got_frame_ptr   = 1;

  1687.     *(AVFrame *)data = vc->frame;

  1688. 

  1689.     return buf_size;

  1690. }

  1691. 

  1692. // Close decoder

  1693. 

  1694. static av_cold int vorbis_decode_close(AVCodecContext *avccontext)

  1695. {

  1696.     vorbis_context *vc = avccontext->priv_data;

  1697. 

  1698.     vorbis_free(vc);

  1699. 

  1700.     return 0;

  1701. }

  1702. 

  1703. static av_cold void vorbis_decode_flush(AVCodecContext *avccontext)

  1704. {

  1705.     vorbis_context *vc = avccontext->priv_data;

  1706. 

  1707.     if (vc->saved) {

  1708.         memset(vc->saved, 0, (vc->blocksize[1] / 4) * vc->audio_channels *

  1709.                              sizeof(*vc->saved));

  1710.     }

  1711.     vc->previous_window = 0;

  1712. }

  1713. 

  1714. AVCodec ff_vorbis_decoder = {

  1715.     .name            = "vorbis",

  1716.     .type            = AVMEDIA_TYPE_AUDIO,

  1717.     .id              = AV_CODEC_ID_VORBIS,

  1718.     .priv_data_size  = sizeof(vorbis_context),

  1719.     .init            = vorbis_decode_init,

  1720.     .close           = vorbis_decode_close,

  1721.     .decode          = vorbis_decode_frame,

  1722.     .flush           = vorbis_decode_flush,

  1723.     .capabilities    = CODEC_CAP_DR1,

  1724.     .long_name       = NULL_IF_CONFIG_SMALL("Vorbis"),

  1725.     .channel_layouts = ff_vorbis_channel_layouts,

  1726.     .sample_fmts     = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,

  1727.                                                        AV_SAMPLE_FMT_NONE },

  1728. };