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FFmpeg/libavcodec/vorbisenc.c

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  1. /*

  2.  * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. /**

  22.  * @file

  23.  * Native Vorbis encoder.

  24.  * @author Oded Shimon <ods15@ods15.dyndns.org>

  25.  */

  26. 

  27. #include <float.h>

  28. #include "avcodec.h"

  29. #include "dsputil.h"

  30. #include "fft.h"

  31. #include "vorbis.h"

  32. #include "vorbis_enc_data.h"

  33. 

  34. #define BITSTREAM_WRITER_LE

  35. #include "put_bits.h"

  36. 

  37. #undef NDEBUG

  38. #include <assert.h>

  39. 

  40. typedef struct {

  41.     int nentries;

  42.     uint8_t *lens;

  43.     uint32_t *codewords;

  44.     int ndimentions;

  45.     float min;

  46.     float delta;

  47.     int seq_p;

  48.     int lookup;

  49.     int *quantlist;

  50.     float *dimentions;

  51.     float *pow2;

  52. } vorbis_enc_codebook;

  53. 

  54. typedef struct {

  55.     int dim;

  56.     int subclass;

  57.     int masterbook;

  58.     int *books;

  59. } vorbis_enc_floor_class;

  60. 

  61. typedef struct {

  62.     int partitions;

  63.     int *partition_to_class;

  64.     int nclasses;

  65.     vorbis_enc_floor_class *classes;

  66.     int multiplier;

  67.     int rangebits;

  68.     int values;

  69.     vorbis_floor1_entry *list;

  70. } vorbis_enc_floor;

  71. 

  72. typedef struct {

  73.     int type;

  74.     int begin;

  75.     int end;

  76.     int partition_size;

  77.     int classifications;

  78.     int classbook;

  79.     int8_t (*books)[8];

  80.     float (*maxes)[2];

  81. } vorbis_enc_residue;

  82. 

  83. typedef struct {

  84.     int submaps;

  85.     int *mux;

  86.     int *floor;

  87.     int *residue;

  88.     int coupling_steps;

  89.     int *magnitude;

  90.     int *angle;

  91. } vorbis_enc_mapping;

  92. 

  93. typedef struct {

  94.     int blockflag;

  95.     int mapping;

  96. } vorbis_enc_mode;

  97. 

  98. typedef struct {

  99.     int channels;

  100.     int sample_rate;

  101.     int log2_blocksize[2];

  102.     FFTContext mdct[2];

  103.     const float *win[2];

  104.     int have_saved;

  105.     float *saved;

  106.     float *samples;

  107.     float *floor;  // also used for tmp values for mdct

  108.     float *coeffs; // also used for residue after floor

  109.     float quality;

  110. 

  111.     int ncodebooks;

  112.     vorbis_enc_codebook *codebooks;

  113. 

  114.     int nfloors;

  115.     vorbis_enc_floor *floors;

  116. 

  117.     int nresidues;

  118.     vorbis_enc_residue *residues;

  119. 

  120.     int nmappings;

  121.     vorbis_enc_mapping *mappings;

  122. 

  123.     int nmodes;

  124.     vorbis_enc_mode *modes;

  125. 

  126.     int64_t sample_count;

  127. } vorbis_enc_context;

  128. 

  129. #define MAX_CHANNELS     2

  130. #define MAX_CODEBOOK_DIM 8

  131. 

  132. #define MAX_FLOOR_CLASS_DIM  4

  133. #define NUM_FLOOR_PARTITIONS 8

  134. #define MAX_FLOOR_VALUES     (MAX_FLOOR_CLASS_DIM*NUM_FLOOR_PARTITIONS+2)

  135. 

  136. #define RESIDUE_SIZE           1600

  137. #define RESIDUE_PART_SIZE      32

  138. #define NUM_RESIDUE_PARTITIONS (RESIDUE_SIZE/RESIDUE_PART_SIZE)

  139. 

  140. static inline void put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb,

  141.                                 int entry)

  142. {

  143.     assert(entry >= 0);

  144.     assert(entry < cb->nentries);

  145.     assert(cb->lens[entry]);

  146.     put_bits(pb, cb->lens[entry], cb->codewords[entry]);

  147. }

  148. 

  149. static int cb_lookup_vals(int lookup, int dimentions, int entries)

  150. {

  151.     if (lookup == 1)

  152.         return ff_vorbis_nth_root(entries, dimentions);

  153.     else if (lookup == 2)

  154.         return dimentions *entries;

  155.     return 0;

  156. }

  157. 

  158. static int ready_codebook(vorbis_enc_codebook *cb)

  159. {

  160.     int i;

  161. 

  162.     ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);

  163. 

  164.     if (!cb->lookup) {

  165.         cb->pow2 = cb->dimentions = NULL;

  166.     } else {

  167.         int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);

  168.         cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions);

  169.         cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);

  170.         if (!cb->dimentions || !cb->pow2)

  171.             return AVERROR(ENOMEM);

  172.         for (i = 0; i < cb->nentries; i++) {

  173.             float last = 0;

  174.             int j;

  175.             int div = 1;

  176.             for (j = 0; j < cb->ndimentions; j++) {

  177.                 int off;

  178.                 if (cb->lookup == 1)

  179.                     off = (i / div) % vals; // lookup type 1

  180.                 else

  181.                     off = i * cb->ndimentions + j; // lookup type 2

  182. 

  183.                 cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;

  184.                 if (cb->seq_p)

  185.                     last = cb->dimentions[i * cb->ndimentions + j];

  186.                 cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j] * cb->dimentions[i * cb->ndimentions + j];

  187.                 div *= vals;

  188.             }

  189.             cb->pow2[i] /= 2.;

  190.         }

  191.     }

  192.     return 0;

  193. }

  194. 

  195. static int ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc)

  196. {

  197.     int i;

  198.     assert(rc->type == 2);

  199.     rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);

  200.     if (!rc->maxes)

  201.         return AVERROR(ENOMEM);

  202.     for (i = 0; i < rc->classifications; i++) {

  203.         int j;

  204.         vorbis_enc_codebook * cb;

  205.         for (j = 0; j < 8; j++)

  206.             if (rc->books[i][j] != -1)

  207.                 break;

  208.         if (j == 8) // zero

  209.             continue;

  210.         cb = &venc->codebooks[rc->books[i][j]];

  211.         assert(cb->ndimentions >= 2);

  212.         assert(cb->lookup);

  213. 

  214.         for (j = 0; j < cb->nentries; j++) {

  215.             float a;

  216.             if (!cb->lens[j])

  217.                 continue;

  218.             a = fabs(cb->dimentions[j * cb->ndimentions]);

  219.             if (a > rc->maxes[i][0])

  220.                 rc->maxes[i][0] = a;

  221.             a = fabs(cb->dimentions[j * cb->ndimentions + 1]);

  222.             if (a > rc->maxes[i][1])

  223.                 rc->maxes[i][1] = a;

  224.         }

  225.     }

  226.     // small bias

  227.     for (i = 0; i < rc->classifications; i++) {

  228.         rc->maxes[i][0] += 0.8;

  229.         rc->maxes[i][1] += 0.8;

  230.     }

  231.     return 0;

  232. }

  233. 

  234. static int create_vorbis_context(vorbis_enc_context *venc,

  235.                                  AVCodecContext *avccontext)

  236. {

  237.     vorbis_enc_floor   *fc;

  238.     vorbis_enc_residue *rc;

  239.     vorbis_enc_mapping *mc;

  240.     int i, book, ret;

  241. 

  242.     venc->channels    = avccontext->channels;

  243.     venc->sample_rate = avccontext->sample_rate;

  244.     venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;

  245. 

  246.     venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);

  247.     venc->codebooks  = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);

  248.     if (!venc->codebooks)

  249.         return AVERROR(ENOMEM);

  250. 

  251.     // codebook 0..14 - floor1 book, values 0..255

  252.     // codebook 15 residue masterbook

  253.     // codebook 16..29 residue

  254.     for (book = 0; book < venc->ncodebooks; book++) {

  255.         vorbis_enc_codebook *cb = &venc->codebooks[book];

  256.         int vals;

  257.         cb->ndimentions = cvectors[book].dim;

  258.         cb->nentries    = cvectors[book].real_len;

  259.         cb->min         = cvectors[book].min;

  260.         cb->delta       = cvectors[book].delta;

  261.         cb->lookup      = cvectors[book].lookup;

  262.         cb->seq_p       = 0;

  263. 

  264.         cb->lens      = av_malloc(sizeof(uint8_t)  * cb->nentries);

  265.         cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);

  266.         if (!cb->lens || !cb->codewords)

  267.             return AVERROR(ENOMEM);

  268.         memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);

  269.         memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);

  270. 

  271.         if (cb->lookup) {

  272.             vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);

  273.             cb->quantlist = av_malloc(sizeof(int) * vals);

  274.             if (!cb->quantlist)

  275.                 return AVERROR(ENOMEM);

  276.             for (i = 0; i < vals; i++)

  277.                 cb->quantlist[i] = cvectors[book].quant[i];

  278.         } else {

  279.             cb->quantlist = NULL;

  280.         }

  281.         if ((ret = ready_codebook(cb)) < 0)

  282.             return ret;

  283.     }

  284. 

  285.     venc->nfloors = 1;

  286.     venc->floors  = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);

  287.     if (!venc->floors)

  288.         return AVERROR(ENOMEM);

  289. 

  290.     // just 1 floor

  291.     fc = &venc->floors[0];

  292.     fc->partitions         = NUM_FLOOR_PARTITIONS;

  293.     fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);

  294.     if (!fc->partition_to_class)

  295.         return AVERROR(ENOMEM);

  296.     fc->nclasses           = 0;

  297.     for (i = 0; i < fc->partitions; i++) {

  298.         static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4};

  299.         fc->partition_to_class[i] = a[i];

  300.         fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);

  301.     }

  302.     fc->nclasses++;

  303.     fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses);

  304.     if (!fc->classes)

  305.         return AVERROR(ENOMEM);

  306.     for (i = 0; i < fc->nclasses; i++) {

  307.         vorbis_enc_floor_class * c = &fc->classes[i];

  308.         int j, books;

  309.         c->dim        = floor_classes[i].dim;

  310.         c->subclass   = floor_classes[i].subclass;

  311.         c->masterbook = floor_classes[i].masterbook;

  312.         books         = (1 << c->subclass);

  313.         c->books      = av_malloc(sizeof(int) * books);

  314.         if (!c->books)

  315.             return AVERROR(ENOMEM);

  316.         for (j = 0; j < books; j++)

  317.             c->books[j] = floor_classes[i].nbooks[j];

  318.     }

  319.     fc->multiplier = 2;

  320.     fc->rangebits  = venc->log2_blocksize[0] - 1;

  321. 

  322.     fc->values = 2;

  323.     for (i = 0; i < fc->partitions; i++)

  324.         fc->values += fc->classes[fc->partition_to_class[i]].dim;

  325. 

  326.     fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);

  327.     if (!fc->list)

  328.         return AVERROR(ENOMEM);

  329.     fc->list[0].x = 0;

  330.     fc->list[1].x = 1 << fc->rangebits;

  331.     for (i = 2; i < fc->values; i++) {

  332.         static const int a[] = {

  333.              93, 23,372,  6, 46,186,750, 14, 33, 65,

  334.             130,260,556,  3, 10, 18, 28, 39, 55, 79,

  335.             111,158,220,312,464,650,850

  336.         };

  337.         fc->list[i].x = a[i - 2];

  338.     }

  339.     ff_vorbis_ready_floor1_list(fc->list, fc->values);

  340. 

  341.     venc->nresidues = 1;

  342.     venc->residues  = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);

  343.     if (!venc->residues)

  344.         return AVERROR(ENOMEM);

  345. 

  346.     // single residue

  347.     rc = &venc->residues[0];

  348.     rc->type            = 2;

  349.     rc->begin           = 0;

  350.     rc->end             = 1600;

  351.     rc->partition_size  = 32;

  352.     rc->classifications = 10;

  353.     rc->classbook       = 15;

  354.     rc->books           = av_malloc(sizeof(*rc->books) * rc->classifications);

  355.     if (!rc->books)

  356.         return AVERROR(ENOMEM);

  357.     {

  358.         static const int8_t a[10][8] = {

  359.             { -1, -1, -1, -1, -1, -1, -1, -1, },

  360.             { -1, -1, 16, -1, -1, -1, -1, -1, },

  361.             { -1, -1, 17, -1, -1, -1, -1, -1, },

  362.             { -1, -1, 18, -1, -1, -1, -1, -1, },

  363.             { -1, -1, 19, -1, -1, -1, -1, -1, },

  364.             { -1, -1, 20, -1, -1, -1, -1, -1, },

  365.             { -1, -1, 21, -1, -1, -1, -1, -1, },

  366.             { 22, 23, -1, -1, -1, -1, -1, -1, },

  367.             { 24, 25, -1, -1, -1, -1, -1, -1, },

  368.             { 26, 27, 28, -1, -1, -1, -1, -1, },

  369.         };

  370.         memcpy(rc->books, a, sizeof a);

  371.     }

  372.     if ((ret = ready_residue(rc, venc)) < 0)

  373.         return ret;

  374. 

  375.     venc->nmappings = 1;

  376.     venc->mappings  = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);

  377.     if (!venc->mappings)

  378.         return AVERROR(ENOMEM);

  379. 

  380.     // single mapping

  381.     mc = &venc->mappings[0];

  382.     mc->submaps = 1;

  383.     mc->mux     = av_malloc(sizeof(int) * venc->channels);

  384.     if (!mc->mux)

  385.         return AVERROR(ENOMEM);

  386.     for (i = 0; i < venc->channels; i++)

  387.         mc->mux[i] = 0;

  388.     mc->floor   = av_malloc(sizeof(int) * mc->submaps);

  389.     mc->residue = av_malloc(sizeof(int) * mc->submaps);

  390.     if (!mc->floor || !mc->residue)

  391.         return AVERROR(ENOMEM);

  392.     for (i = 0; i < mc->submaps; i++) {

  393.         mc->floor[i]   = 0;

  394.         mc->residue[i] = 0;

  395.     }

  396.     mc->coupling_steps = venc->channels == 2 ? 1 : 0;

  397.     mc->magnitude      = av_malloc(sizeof(int) * mc->coupling_steps);

  398.     mc->angle          = av_malloc(sizeof(int) * mc->coupling_steps);

  399.     if (!mc->magnitude || !mc->angle)

  400.         return AVERROR(ENOMEM);

  401.     if (mc->coupling_steps) {

  402.         mc->magnitude[0] = 0;

  403.         mc->angle[0]     = 1;

  404.     }

  405. 

  406.     venc->nmodes = 1;

  407.     venc->modes  = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);

  408.     if (!venc->modes)

  409.         return AVERROR(ENOMEM);

  410. 

  411.     // single mode

  412.     venc->modes[0].blockflag = 0;

  413.     venc->modes[0].mapping   = 0;

  414. 

  415.     venc->have_saved = 0;

  416.     venc->saved      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);

  417.     venc->samples    = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));

  418.     venc->floor      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);

  419.     venc->coeffs     = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);

  420.     if (!venc->saved || !venc->samples || !venc->floor || !venc->coeffs)

  421.         return AVERROR(ENOMEM);

  422. 

  423.     venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];

  424.     venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];

  425. 

  426.     if ((ret = ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0)) < 0)

  427.         return ret;

  428.     if ((ret = ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0)) < 0)

  429.         return ret;

  430. 

  431.     return 0;

  432. }

  433. 

  434. static void put_float(PutBitContext *pb, float f)

  435. {

  436.     int exp, mant;

  437.     uint32_t res = 0;

  438.     mant = (int)ldexp(frexp(f, &exp), 20);

  439.     exp += 788 - 20;

  440.     if (mant < 0) {

  441.         res |= (1U << 31);

  442.         mant = -mant;

  443.     }

  444.     res |= mant | (exp << 21);

  445.     put_bits32(pb, res);

  446. }

  447. 

  448. static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb)

  449. {

  450.     int i;

  451.     int ordered = 0;

  452. 

  453.     put_bits(pb, 24, 0x564342); //magic

  454.     put_bits(pb, 16, cb->ndimentions);

  455.     put_bits(pb, 24, cb->nentries);

  456. 

  457.     for (i = 1; i < cb->nentries; i++)

  458.         if (cb->lens[i] < cb->lens[i-1])

  459.             break;

  460.     if (i == cb->nentries)

  461.         ordered = 1;

  462. 

  463.     put_bits(pb, 1, ordered);

  464.     if (ordered) {

  465.         int len = cb->lens[0];

  466.         put_bits(pb, 5, len - 1);

  467.         i = 0;

  468.         while (i < cb->nentries) {

  469.             int j;

  470.             for (j = 0; j+i < cb->nentries; j++)

  471.                 if (cb->lens[j+i] != len)

  472.                     break;

  473.             put_bits(pb, ilog(cb->nentries - i), j);

  474.             i += j;

  475.             len++;

  476.         }

  477.     } else {

  478.         int sparse = 0;

  479.         for (i = 0; i < cb->nentries; i++)

  480.             if (!cb->lens[i])

  481.                 break;

  482.         if (i != cb->nentries)

  483.             sparse = 1;

  484.         put_bits(pb, 1, sparse);

  485. 

  486.         for (i = 0; i < cb->nentries; i++) {

  487.             if (sparse)

  488.                 put_bits(pb, 1, !!cb->lens[i]);

  489.             if (cb->lens[i])

  490.                 put_bits(pb, 5, cb->lens[i] - 1);

  491.         }

  492.     }

  493. 

  494.     put_bits(pb, 4, cb->lookup);

  495.     if (cb->lookup) {

  496.         int tmp  = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);

  497.         int bits = ilog(cb->quantlist[0]);

  498. 

  499.         for (i = 1; i < tmp; i++)

  500.             bits = FFMAX(bits, ilog(cb->quantlist[i]));

  501. 

  502.         put_float(pb, cb->min);

  503.         put_float(pb, cb->delta);

  504. 

  505.         put_bits(pb, 4, bits - 1);

  506.         put_bits(pb, 1, cb->seq_p);

  507. 

  508.         for (i = 0; i < tmp; i++)

  509.             put_bits(pb, bits, cb->quantlist[i]);

  510.     }

  511. }

  512. 

  513. static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc)

  514. {

  515.     int i;

  516. 

  517.     put_bits(pb, 16, 1); // type, only floor1 is supported

  518. 

  519.     put_bits(pb, 5, fc->partitions);

  520. 

  521.     for (i = 0; i < fc->partitions; i++)

  522.         put_bits(pb, 4, fc->partition_to_class[i]);

  523. 

  524.     for (i = 0; i < fc->nclasses; i++) {

  525.         int j, books;

  526. 

  527.         put_bits(pb, 3, fc->classes[i].dim - 1);

  528.         put_bits(pb, 2, fc->classes[i].subclass);

  529. 

  530.         if (fc->classes[i].subclass)

  531.             put_bits(pb, 8, fc->classes[i].masterbook);

  532. 

  533.         books = (1 << fc->classes[i].subclass);

  534. 

  535.         for (j = 0; j < books; j++)

  536.             put_bits(pb, 8, fc->classes[i].books[j] + 1);

  537.     }

  538. 

  539.     put_bits(pb, 2, fc->multiplier - 1);

  540.     put_bits(pb, 4, fc->rangebits);

  541. 

  542.     for (i = 2; i < fc->values; i++)

  543.         put_bits(pb, fc->rangebits, fc->list[i].x);

  544. }

  545. 

  546. static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *rc)

  547. {

  548.     int i;

  549. 

  550.     put_bits(pb, 16, rc->type);

  551. 

  552.     put_bits(pb, 24, rc->begin);

  553.     put_bits(pb, 24, rc->end);

  554.     put_bits(pb, 24, rc->partition_size - 1);

  555.     put_bits(pb, 6, rc->classifications - 1);

  556.     put_bits(pb, 8, rc->classbook);

  557. 

  558.     for (i = 0; i < rc->classifications; i++) {

  559.         int j, tmp = 0;

  560.         for (j = 0; j < 8; j++)

  561.             tmp |= (rc->books[i][j] != -1) << j;

  562. 

  563.         put_bits(pb, 3, tmp & 7);

  564.         put_bits(pb, 1, tmp > 7);

  565. 

  566.         if (tmp > 7)

  567.             put_bits(pb, 5, tmp >> 3);

  568.     }

  569. 

  570.     for (i = 0; i < rc->classifications; i++) {

  571.         int j;

  572.         for (j = 0; j < 8; j++)

  573.             if (rc->books[i][j] != -1)

  574.                 put_bits(pb, 8, rc->books[i][j]);

  575.     }

  576. }

  577. 

  578. static int put_main_header(vorbis_enc_context *venc, uint8_t **out)

  579. {

  580.     int i;

  581.     PutBitContext pb;

  582.     uint8_t buffer[50000] = {0}, *p = buffer;

  583.     int buffer_len = sizeof buffer;

  584.     int len, hlens[3];

  585. 

  586.     // identification header

  587.     init_put_bits(&pb, p, buffer_len);

  588.     put_bits(&pb, 8, 1); //magic

  589.     for (i = 0; "vorbis"[i]; i++)

  590.         put_bits(&pb, 8, "vorbis"[i]);

  591.     put_bits32(&pb, 0); // version

  592.     put_bits(&pb,  8, venc->channels);

  593.     put_bits32(&pb, venc->sample_rate);

  594.     put_bits32(&pb, 0); // bitrate

  595.     put_bits32(&pb, 0); // bitrate

  596.     put_bits32(&pb, 0); // bitrate

  597.     put_bits(&pb,  4, venc->log2_blocksize[0]);

  598.     put_bits(&pb,  4, venc->log2_blocksize[1]);

  599.     put_bits(&pb,  1, 1); // framing

  600. 

  601.     flush_put_bits(&pb);

  602.     hlens[0] = put_bits_count(&pb) >> 3;

  603.     buffer_len -= hlens[0];

  604.     p += hlens[0];

  605. 

  606.     // comment header

  607.     init_put_bits(&pb, p, buffer_len);

  608.     put_bits(&pb, 8, 3); //magic

  609.     for (i = 0; "vorbis"[i]; i++)

  610.         put_bits(&pb, 8, "vorbis"[i]);

  611.     put_bits32(&pb, 0); // vendor length TODO

  612.     put_bits32(&pb, 0); // amount of comments

  613.     put_bits(&pb,  1, 1); // framing

  614. 

  615.     flush_put_bits(&pb);

  616.     hlens[1] = put_bits_count(&pb) >> 3;

  617.     buffer_len -= hlens[1];

  618.     p += hlens[1];

  619. 

  620.     // setup header

  621.     init_put_bits(&pb, p, buffer_len);

  622.     put_bits(&pb, 8, 5); //magic

  623.     for (i = 0; "vorbis"[i]; i++)

  624.         put_bits(&pb, 8, "vorbis"[i]);

  625. 

  626.     // codebooks

  627.     put_bits(&pb, 8, venc->ncodebooks - 1);

  628.     for (i = 0; i < venc->ncodebooks; i++)

  629.         put_codebook_header(&pb, &venc->codebooks[i]);

  630. 

  631.     // time domain, reserved, zero

  632.     put_bits(&pb,  6, 0);

  633.     put_bits(&pb, 16, 0);

  634. 

  635.     // floors

  636.     put_bits(&pb, 6, venc->nfloors - 1);

  637.     for (i = 0; i < venc->nfloors; i++)

  638.         put_floor_header(&pb, &venc->floors[i]);

  639. 

  640.     // residues

  641.     put_bits(&pb, 6, venc->nresidues - 1);

  642.     for (i = 0; i < venc->nresidues; i++)

  643.         put_residue_header(&pb, &venc->residues[i]);

  644. 

  645.     // mappings

  646.     put_bits(&pb, 6, venc->nmappings - 1);

  647.     for (i = 0; i < venc->nmappings; i++) {

  648.         vorbis_enc_mapping *mc = &venc->mappings[i];

  649.         int j;

  650.         put_bits(&pb, 16, 0); // mapping type

  651. 

  652.         put_bits(&pb, 1, mc->submaps > 1);

  653.         if (mc->submaps > 1)

  654.             put_bits(&pb, 4, mc->submaps - 1);

  655. 

  656.         put_bits(&pb, 1, !!mc->coupling_steps);

  657.         if (mc->coupling_steps) {

  658.             put_bits(&pb, 8, mc->coupling_steps - 1);

  659.             for (j = 0; j < mc->coupling_steps; j++) {

  660.                 put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);

  661.                 put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);

  662.             }

  663.         }

  664. 

  665.         put_bits(&pb, 2, 0); // reserved

  666. 

  667.         if (mc->submaps > 1)

  668.             for (j = 0; j < venc->channels; j++)

  669.                 put_bits(&pb, 4, mc->mux[j]);

  670. 

  671.         for (j = 0; j < mc->submaps; j++) {

  672.             put_bits(&pb, 8, 0); // reserved time configuration

  673.             put_bits(&pb, 8, mc->floor[j]);

  674.             put_bits(&pb, 8, mc->residue[j]);

  675.         }

  676.     }

  677. 

  678.     // modes

  679.     put_bits(&pb, 6, venc->nmodes - 1);

  680.     for (i = 0; i < venc->nmodes; i++) {

  681.         put_bits(&pb, 1, venc->modes[i].blockflag);

  682.         put_bits(&pb, 16, 0); // reserved window type

  683.         put_bits(&pb, 16, 0); // reserved transform type

  684.         put_bits(&pb, 8, venc->modes[i].mapping);

  685.     }

  686. 

  687.     put_bits(&pb, 1, 1); // framing

  688. 

  689.     flush_put_bits(&pb);

  690.     hlens[2] = put_bits_count(&pb) >> 3;

  691. 

  692.     len = hlens[0] + hlens[1] + hlens[2];

  693.     p = *out = av_mallocz(64 + len + len/255);

  694.     if (!p)

  695.         return AVERROR(ENOMEM);

  696. 

  697.     *p++ = 2;

  698.     p += av_xiphlacing(p, hlens[0]);

  699.     p += av_xiphlacing(p, hlens[1]);

  700.     buffer_len = 0;

  701.     for (i = 0; i < 3; i++) {

  702.         memcpy(p, buffer + buffer_len, hlens[i]);

  703.         p += hlens[i];

  704.         buffer_len += hlens[i];

  705.     }

  706. 

  707.     return p - *out;

  708. }

  709. 

  710. static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i)

  711. {

  712.     int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;

  713.     int end   = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;

  714.     int j;

  715.     float average = 0;

  716. 

  717.     for (j = begin; j < end; j++)

  718.         average += fabs(coeffs[j]);

  719.     return average / (end - begin);

  720. }

  721. 

  722. static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc,

  723.                       float *coeffs, uint16_t *posts, int samples)

  724. {

  725.     int range = 255 / fc->multiplier + 1;

  726.     int i;

  727.     float tot_average = 0.;

  728.     float averages[MAX_FLOOR_VALUES];

  729.     for (i = 0; i < fc->values; i++) {

  730.         averages[i] = get_floor_average(fc, coeffs, i);

  731.         tot_average += averages[i];

  732.     }

  733.     tot_average /= fc->values;

  734.     tot_average /= venc->quality;

  735. 

  736.     for (i = 0; i < fc->values; i++) {

  737.         int position  = fc->list[fc->list[i].sort].x;

  738.         float average = averages[i];

  739.         int j;

  740. 

  741.         average = sqrt(tot_average * average) * pow(1.25f, position*0.005f); // MAGIC!

  742.         for (j = 0; j < range - 1; j++)

  743.             if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average)

  744.                 break;

  745.         posts[fc->list[i].sort] = j;

  746.     }

  747. }

  748. 

  749. static int render_point(int x0, int y0, int x1, int y1, int x)

  750. {

  751.     return y0 +  (x - x0) * (y1 - y0) / (x1 - x0);

  752. }

  753. 

  754. static void floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,

  755.                          PutBitContext *pb, uint16_t *posts,

  756.                          float *floor, int samples)

  757. {

  758.     int range = 255 / fc->multiplier + 1;

  759.     int coded[MAX_FLOOR_VALUES]; // first 2 values are unused

  760.     int i, counter;

  761. 

  762.     put_bits(pb, 1, 1); // non zero

  763.     put_bits(pb, ilog(range - 1), posts[0]);

  764.     put_bits(pb, ilog(range - 1), posts[1]);

  765.     coded[0] = coded[1] = 1;

  766. 

  767.     for (i = 2; i < fc->values; i++) {

  768.         int predicted = render_point(fc->list[fc->list[i].low].x,

  769.                                      posts[fc->list[i].low],

  770.                                      fc->list[fc->list[i].high].x,

  771.                                      posts[fc->list[i].high],

  772.                                      fc->list[i].x);

  773.         int highroom = range - predicted;

  774.         int lowroom = predicted;

  775.         int room = FFMIN(highroom, lowroom);

  776.         if (predicted == posts[i]) {

  777.             coded[i] = 0; // must be used later as flag!

  778.             continue;

  779.         } else {

  780.             if (!coded[fc->list[i].low ])

  781.                 coded[fc->list[i].low ] = -1;

  782.             if (!coded[fc->list[i].high])

  783.                 coded[fc->list[i].high] = -1;

  784.         }

  785.         if (posts[i] > predicted) {

  786.             if (posts[i] - predicted > room)

  787.                 coded[i] = posts[i] - predicted + lowroom;

  788.             else

  789.                 coded[i] = (posts[i] - predicted) << 1;

  790.         } else {

  791.             if (predicted - posts[i] > room)

  792.                 coded[i] = predicted - posts[i] + highroom - 1;

  793.             else

  794.                 coded[i] = ((predicted - posts[i]) << 1) - 1;

  795.         }

  796.     }

  797. 

  798.     counter = 2;

  799.     for (i = 0; i < fc->partitions; i++) {

  800.         vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];

  801.         int k, cval = 0, csub = 1<<c->subclass;

  802.         if (c->subclass) {

  803.             vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];

  804.             int cshift = 0;

  805.             for (k = 0; k < c->dim; k++) {

  806.                 int l;

  807.                 for (l = 0; l < csub; l++) {

  808.                     int maxval = 1;

  809.                     if (c->books[l] != -1)

  810.                         maxval = venc->codebooks[c->books[l]].nentries;

  811.                     // coded could be -1, but this still works, cause that is 0

  812.                     if (coded[counter + k] < maxval)

  813.                         break;

  814.                 }

  815.                 assert(l != csub);

  816.                 cval   |= l << cshift;

  817.                 cshift += c->subclass;

  818.             }

  819.             put_codeword(pb, book, cval);

  820.         }

  821.         for (k = 0; k < c->dim; k++) {

  822.             int book  = c->books[cval & (csub-1)];

  823.             int entry = coded[counter++];

  824.             cval >>= c->subclass;

  825.             if (book == -1)

  826.                 continue;

  827.             if (entry == -1)

  828.                 entry = 0;

  829.             put_codeword(pb, &venc->codebooks[book], entry);

  830.         }

  831.     }

  832. 

  833.     ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded,

  834.                                  fc->multiplier, floor, samples);

  835. }

  836. 

  837. static float *put_vector(vorbis_enc_codebook *book, PutBitContext *pb,

  838.                          float *num)

  839. {

  840.     int i, entry = -1;

  841.     float distance = FLT_MAX;

  842.     assert(book->dimentions);

  843.     for (i = 0; i < book->nentries; i++) {

  844.         float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i];

  845.         int j;

  846.         if (!book->lens[i])

  847.             continue;

  848.         for (j = 0; j < book->ndimentions; j++)

  849.             d -= vec[j] * num[j];

  850.         if (distance > d) {

  851.             entry    = i;

  852.             distance = d;

  853.         }

  854.     }

  855.     put_codeword(pb, book, entry);

  856.     return &book->dimentions[entry * book->ndimentions];

  857. }

  858. 

  859. static void residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,

  860.                            PutBitContext *pb, float *coeffs, int samples,

  861.                            int real_ch)

  862. {

  863.     int pass, i, j, p, k;

  864.     int psize      = rc->partition_size;

  865.     int partitions = (rc->end - rc->begin) / psize;

  866.     int channels   = (rc->type == 2) ? 1 : real_ch;

  867.     int classes[MAX_CHANNELS][NUM_RESIDUE_PARTITIONS];

  868.     int classwords = venc->codebooks[rc->classbook].ndimentions;

  869. 

  870.     assert(rc->type == 2);

  871.     assert(real_ch == 2);

  872.     for (p = 0; p < partitions; p++) {

  873.         float max1 = 0., max2 = 0.;

  874.         int s = rc->begin + p * psize;

  875.         for (k = s; k < s + psize; k += 2) {

  876.             max1 = FFMAX(max1, fabs(coeffs[          k / real_ch]));

  877.             max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));

  878.         }

  879. 

  880.         for (i = 0; i < rc->classifications - 1; i++)

  881.             if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1])

  882.                 break;

  883.         classes[0][p] = i;

  884.     }

  885. 

  886.     for (pass = 0; pass < 8; pass++) {

  887.         p = 0;

  888.         while (p < partitions) {

  889.             if (pass == 0)

  890.                 for (j = 0; j < channels; j++) {

  891.                     vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];

  892.                     int entry = 0;

  893.                     for (i = 0; i < classwords; i++) {

  894.                         entry *= rc->classifications;

  895.                         entry += classes[j][p + i];

  896.                     }

  897.                     put_codeword(pb, book, entry);

  898.                 }

  899.             for (i = 0; i < classwords && p < partitions; i++, p++) {

  900.                 for (j = 0; j < channels; j++) {

  901.                     int nbook = rc->books[classes[j][p]][pass];

  902.                     vorbis_enc_codebook * book = &venc->codebooks[nbook];

  903.                     float *buf = coeffs + samples*j + rc->begin + p*psize;

  904.                     if (nbook == -1)

  905.                         continue;

  906. 

  907.                     assert(rc->type == 0 || rc->type == 2);

  908.                     assert(!(psize % book->ndimentions));

  909. 

  910.                     if (rc->type == 0) {

  911.                         for (k = 0; k < psize; k += book->ndimentions) {

  912.                             float *a = put_vector(book, pb, &buf[k]);

  913.                             int l;

  914.                             for (l = 0; l < book->ndimentions; l++)

  915.                                 buf[k + l] -= a[l];

  916.                         }

  917.                     } else {

  918.                         int s = rc->begin + p * psize, a1, b1;

  919.                         a1 = (s % real_ch) * samples;

  920.                         b1 =  s / real_ch;

  921.                         s  = real_ch * samples;

  922.                         for (k = 0; k < psize; k += book->ndimentions) {

  923.                             int dim, a2 = a1, b2 = b1;

  924.                             float vec[MAX_CODEBOOK_DIM], *pv = vec;

  925.                             for (dim = book->ndimentions; dim--; ) {

  926.                                 *pv++ = coeffs[a2 + b2];

  927.                                 if ((a2 += samples) == s) {

  928.                                     a2 = 0;

  929.                                     b2++;

  930.                                 }

  931.                             }

  932.                             pv = put_vector(book, pb, vec);

  933.                             for (dim = book->ndimentions; dim--; ) {

  934.                                 coeffs[a1 + b1] -= *pv++;

  935.                                 if ((a1 += samples) == s) {

  936.                                     a1 = 0;

  937.                                     b1++;

  938.                                 }

  939.                             }

  940.                         }

  941.                     }

  942.                 }

  943.             }

  944.         }

  945.     }

  946. }

  947. 

  948. static int apply_window_and_mdct(vorbis_enc_context *venc, const signed short *audio,

  949.                                  int samples)

  950. {

  951.     int i, j, channel;

  952.     const float * win = venc->win[0];

  953.     int window_len = 1 << (venc->log2_blocksize[0] - 1);

  954.     float n = (float)(1 << venc->log2_blocksize[0]) / 4.;

  955.     // FIXME use dsp

  956. 

  957.     if (!venc->have_saved && !samples)

  958.         return 0;

  959. 

  960.     if (venc->have_saved) {

  961.         for (channel = 0; channel < venc->channels; channel++)

  962.             memcpy(venc->samples + channel * window_len * 2,

  963.                    venc->saved + channel * window_len, sizeof(float) * window_len);

  964.     } else {

  965.         for (channel = 0; channel < venc->channels; channel++)

  966.             memset(venc->samples + channel * window_len * 2, 0,

  967.                    sizeof(float) * window_len);

  968.     }

  969. 

  970.     if (samples) {

  971.         for (channel = 0; channel < venc->channels; channel++) {

  972.             float * offset = venc->samples + channel*window_len*2 + window_len;

  973.             j = channel;

  974.             for (i = 0; i < samples; i++, j += venc->channels)

  975.                 offset[i] = audio[j] / 32768. / n * win[window_len - i - 1];

  976.         }

  977.     } else {

  978.         for (channel = 0; channel < venc->channels; channel++)

  979.             memset(venc->samples + channel * window_len * 2 + window_len,

  980.                    0, sizeof(float) * window_len);

  981.     }

  982. 

  983.     for (channel = 0; channel < venc->channels; channel++)

  984.         venc->mdct[0].mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,

  985.                      venc->samples + channel * window_len * 2);

  986. 

  987.     if (samples) {

  988.         for (channel = 0; channel < venc->channels; channel++) {

  989.             float *offset = venc->saved + channel * window_len;

  990.             j = channel;

  991.             for (i = 0; i < samples; i++, j += venc->channels)

  992.                 offset[i] = audio[j] / 32768. / n * win[i];

  993.         }

  994.         venc->have_saved = 1;

  995.     } else {

  996.         venc->have_saved = 0;

  997.     }

  998.     return 1;

  999. }

  1000. 

  1001. static int vorbis_encode_frame(AVCodecContext *avccontext,

  1002.                                unsigned char *packets,

  1003.                                int buf_size, void *data)

  1004. {

  1005.     vorbis_enc_context *venc = avccontext->priv_data;

  1006.     const signed short *audio = data;

  1007.     int samples = data ? avccontext->frame_size : 0;

  1008.     vorbis_enc_mode *mode;

  1009.     vorbis_enc_mapping *mapping;

  1010.     PutBitContext pb;

  1011.     int i;

  1012. 

  1013.     if (!apply_window_and_mdct(venc, audio, samples))

  1014.         return 0;

  1015.     samples = 1 << (venc->log2_blocksize[0] - 1);

  1016. 

  1017.     init_put_bits(&pb, packets, buf_size);

  1018. 

  1019.     put_bits(&pb, 1, 0); // magic bit

  1020. 

  1021.     put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode

  1022. 

  1023.     mode    = &venc->modes[0];

  1024.     mapping = &venc->mappings[mode->mapping];

  1025.     if (mode->blockflag) {

  1026.         put_bits(&pb, 1, 0);

  1027.         put_bits(&pb, 1, 0);

  1028.     }

  1029. 

  1030.     for (i = 0; i < venc->channels; i++) {

  1031.         vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];

  1032.         uint16_t posts[MAX_FLOOR_VALUES];

  1033.         floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);

  1034.         floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples);

  1035.     }

  1036. 

  1037.     for (i = 0; i < venc->channels * samples; i++)

  1038.         venc->coeffs[i] /= venc->floor[i];

  1039. 

  1040.     for (i = 0; i < mapping->coupling_steps; i++) {

  1041.         float *mag = venc->coeffs + mapping->magnitude[i] * samples;

  1042.         float *ang = venc->coeffs + mapping->angle[i]     * samples;

  1043.         int j;

  1044.         for (j = 0; j < samples; j++) {

  1045.             float a = ang[j];

  1046.             ang[j] -= mag[j];

  1047.             if (mag[j] > 0)

  1048.                 ang[j] = -ang[j];

  1049.             if (ang[j] < 0)

  1050.                 mag[j] = a;

  1051.         }

  1052.     }

  1053. 

  1054.     residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],

  1055.                    &pb, venc->coeffs, samples, venc->channels);

  1056. 

  1057.     avccontext->coded_frame->pts = venc->sample_count;

  1058.     venc->sample_count += avccontext->frame_size;

  1059.     flush_put_bits(&pb);

  1060.     return put_bits_count(&pb) >> 3;

  1061. }

  1062. 

  1063. 

  1064. static av_cold int vorbis_encode_close(AVCodecContext *avccontext)

  1065. {

  1066.     vorbis_enc_context *venc = avccontext->priv_data;

  1067.     int i;

  1068. 

  1069.     if (venc->codebooks)

  1070.         for (i = 0; i < venc->ncodebooks; i++) {

  1071.             av_freep(&venc->codebooks[i].lens);

  1072.             av_freep(&venc->codebooks[i].codewords);

  1073.             av_freep(&venc->codebooks[i].quantlist);

  1074.             av_freep(&venc->codebooks[i].dimentions);

  1075.             av_freep(&venc->codebooks[i].pow2);

  1076.         }

  1077.     av_freep(&venc->codebooks);

  1078. 

  1079.     if (venc->floors)

  1080.         for (i = 0; i < venc->nfloors; i++) {

  1081.             int j;

  1082.             if (venc->floors[i].classes)

  1083.                 for (j = 0; j < venc->floors[i].nclasses; j++)

  1084.                     av_freep(&venc->floors[i].classes[j].books);

  1085.             av_freep(&venc->floors[i].classes);

  1086.             av_freep(&venc->floors[i].partition_to_class);

  1087.             av_freep(&venc->floors[i].list);

  1088.         }

  1089.     av_freep(&venc->floors);

  1090. 

  1091.     if (venc->residues)

  1092.         for (i = 0; i < venc->nresidues; i++) {

  1093.             av_freep(&venc->residues[i].books);

  1094.             av_freep(&venc->residues[i].maxes);

  1095.         }

  1096.     av_freep(&venc->residues);

  1097. 

  1098.     if (venc->mappings)

  1099.         for (i = 0; i < venc->nmappings; i++) {

  1100.             av_freep(&venc->mappings[i].mux);

  1101.             av_freep(&venc->mappings[i].floor);

  1102.             av_freep(&venc->mappings[i].residue);

  1103.             av_freep(&venc->mappings[i].magnitude);

  1104.             av_freep(&venc->mappings[i].angle);

  1105.         }

  1106.     av_freep(&venc->mappings);

  1107. 

  1108.     av_freep(&venc->modes);

  1109. 

  1110.     av_freep(&venc->saved);

  1111.     av_freep(&venc->samples);

  1112.     av_freep(&venc->floor);

  1113.     av_freep(&venc->coeffs);

  1114. 

  1115.     ff_mdct_end(&venc->mdct[0]);

  1116.     ff_mdct_end(&venc->mdct[1]);

  1117. 

  1118.     av_freep(&avccontext->coded_frame);

  1119.     av_freep(&avccontext->extradata);

  1120. 

  1121.     return 0 ;

  1122. }

  1123. 

  1124. static av_cold int vorbis_encode_init(AVCodecContext *avccontext)

  1125. {

  1126.     vorbis_enc_context *venc = avccontext->priv_data;

  1127.     int ret;

  1128. 

  1129.     if (avccontext->channels != 2) {

  1130.         av_log(avccontext, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");

  1131.         return -1;

  1132.     }

  1133. 

  1134.     if ((ret = create_vorbis_context(venc, avccontext)) < 0)

  1135.         goto error;

  1136. 

  1137.     if (avccontext->flags & CODEC_FLAG_QSCALE)

  1138.         venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;

  1139.     else

  1140.         venc->quality = 0.03;

  1141.     venc->quality *= venc->quality;

  1142. 

  1143.     if ((ret = put_main_header(venc, (uint8_t**)&avccontext->extradata)) < 0)

  1144.         goto error;

  1145.     avccontext->extradata_size = ret;

  1146. 

  1147.     avccontext->frame_size = 1 << (venc->log2_blocksize[0] - 1);

  1148. 

  1149.     avccontext->coded_frame = avcodec_alloc_frame();

  1150.     if (!avccontext->coded_frame) {

  1151.         ret = AVERROR(ENOMEM);

  1152.         goto error;

  1153.     }

  1154. 

  1155.     return 0;

  1156. error:

  1157.     vorbis_encode_close(avccontext);

  1158.     return ret;

  1159. }

  1160. 

  1161. AVCodec ff_vorbis_encoder = {

  1162.     .name           = "vorbis",

  1163.     .type           = AVMEDIA_TYPE_AUDIO,

  1164.     .id             = CODEC_ID_VORBIS,

  1165.     .priv_data_size = sizeof(vorbis_enc_context),

  1166.     .init           = vorbis_encode_init,

  1167.     .encode         = vorbis_encode_frame,

  1168.     .close          = vorbis_encode_close,

  1169.     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL,

  1170.     .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},

  1171.     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),

  1172. };