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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 Libav.

  5.  *

  6.  * Libav 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.  * Libav 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 Libav; 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 "internal.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 ndimensions;

  45.     float min;

  46.     float delta;

  47.     int seq_p;

  48.     int lookup;

  49.     int *quantlist;

  50.     float *dimensions;

  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 next_pts;

  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 int 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.     if (pb->size_in_bits - put_bits_count(pb) < cb->lens[entry])

  147.         return AVERROR(EINVAL);

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

  149.     return 0;

  150. }

  151. 

  152. static int cb_lookup_vals(int lookup, int dimensions, int entries)

  153. {

  154.     if (lookup == 1)

  155.         return ff_vorbis_nth_root(entries, dimensions);

  156.     else if (lookup == 2)

  157.         return dimensions *entries;

  158.     return 0;

  159. }

  160. 

  161. static int ready_codebook(vorbis_enc_codebook *cb)

  162. {

  163.     int i;

  164. 

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

  166. 

  167.     if (!cb->lookup) {

  168.         cb->pow2 = cb->dimensions = NULL;

  169.     } else {

  170.         int vals = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);

  171.         cb->dimensions = av_malloc(sizeof(float) * cb->nentries * cb->ndimensions);

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

  173.         if (!cb->dimensions || !cb->pow2)

  174.             return AVERROR(ENOMEM);

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

  176.             float last = 0;

  177.             int j;

  178.             int div = 1;

  179.             for (j = 0; j < cb->ndimensions; j++) {

  180.                 int off;

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

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

  183.                 else

  184.                     off = i * cb->ndimensions + j; // lookup type 2

  185. 

  186.                 cb->dimensions[i * cb->ndimensions + j] = last + cb->min + cb->quantlist[off] * cb->delta;

  187.                 if (cb->seq_p)

  188.                     last = cb->dimensions[i * cb->ndimensions + j];

  189.                 cb->pow2[i] += cb->dimensions[i * cb->ndimensions + j] * cb->dimensions[i * cb->ndimensions + j];

  190.                 div *= vals;

  191.             }

  192.             cb->pow2[i] /= 2.0;

  193.         }

  194.     }

  195.     return 0;

  196. }

  197. 

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

  199. {

  200.     int i;

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

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

  203.     if (!rc->maxes)

  204.         return AVERROR(ENOMEM);

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

  206.         int j;

  207.         vorbis_enc_codebook * cb;

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

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

  210.                 break;

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

  212.             continue;

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

  214.         assert(cb->ndimensions >= 2);

  215.         assert(cb->lookup);

  216. 

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

  218.             float a;

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

  220.                 continue;

  221.             a = fabs(cb->dimensions[j * cb->ndimensions]);

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

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

  224.             a = fabs(cb->dimensions[j * cb->ndimensions + 1]);

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

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

  227.         }

  228.     }

  229.     // small bias

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

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

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

  233.     }

  234.     return 0;

  235. }

  236. 

  237. static int create_vorbis_context(vorbis_enc_context *venc,

  238.                                  AVCodecContext *avctx)

  239. {

  240.     vorbis_enc_floor   *fc;

  241.     vorbis_enc_residue *rc;

  242.     vorbis_enc_mapping *mc;

  243.     int i, book, ret;

  244. 

  245.     venc->channels    = avctx->channels;

  246.     venc->sample_rate = avctx->sample_rate;

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

  248. 

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

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

  251.     if (!venc->codebooks)

  252.         return AVERROR(ENOMEM);

  253. 

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

  255.     // codebook 15 residue masterbook

  256.     // codebook 16..29 residue

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

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

  259.         int vals;

  260.         cb->ndimensions = cvectors[book].dim;

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

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

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

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

  265.         cb->seq_p       = 0;

  266. 

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

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

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

  270.             return AVERROR(ENOMEM);

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

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

  273. 

  274.         if (cb->lookup) {

  275.             vals = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);

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

  277.             if (!cb->quantlist)

  278.                 return AVERROR(ENOMEM);

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

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

  281.         } else {

  282.             cb->quantlist = NULL;

  283.         }

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

  285.             return ret;

  286.     }

  287. 

  288.     venc->nfloors = 1;

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

  290.     if (!venc->floors)

  291.         return AVERROR(ENOMEM);

  292. 

  293.     // just 1 floor

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

  295.     fc->partitions         = NUM_FLOOR_PARTITIONS;

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

  297.     if (!fc->partition_to_class)

  298.         return AVERROR(ENOMEM);

  299.     fc->nclasses           = 0;

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

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

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

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

  304.     }

  305.     fc->nclasses++;

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

  307.     if (!fc->classes)

  308.         return AVERROR(ENOMEM);

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

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

  311.         int j, books;

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

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

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

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

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

  317.         if (!c->books)

  318.             return AVERROR(ENOMEM);

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

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

  321.     }

  322.     fc->multiplier = 2;

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

  324. 

  325.     fc->values = 2;

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

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

  328. 

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

  330.     if (!fc->list)

  331.         return AVERROR(ENOMEM);

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

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

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

  335.         static const int a[] = {

  336.              93, 23,372,  6, 46,186,750, 14, 33, 65,

  337.             130,260,556,  3, 10, 18, 28, 39, 55, 79,

  338.             111,158,220,312,464,650,850

  339.         };

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

  341.     }

  342.     if (ff_vorbis_ready_floor1_list(avctx, fc->list, fc->values))

  343.         return AVERROR_BUG;

  344. 

  345.     venc->nresidues = 1;

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

  347.     if (!venc->residues)

  348.         return AVERROR(ENOMEM);

  349. 

  350.     // single residue

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

  352.     rc->type            = 2;

  353.     rc->begin           = 0;

  354.     rc->end             = 1600;

  355.     rc->partition_size  = 32;

  356.     rc->classifications = 10;

  357.     rc->classbook       = 15;

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

  359.     if (!rc->books)

  360.         return AVERROR(ENOMEM);

  361.     {

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

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

  364.             { -1, -1, 16, -1, -1, -1, -1, -1, },

  365.             { -1, -1, 17, -1, -1, -1, -1, -1, },

  366.             { -1, -1, 18, -1, -1, -1, -1, -1, },

  367.             { -1, -1, 19, -1, -1, -1, -1, -1, },

  368.             { -1, -1, 20, -1, -1, -1, -1, -1, },

  369.             { -1, -1, 21, -1, -1, -1, -1, -1, },

  370.             { 22, 23, -1, -1, -1, -1, -1, -1, },

  371.             { 24, 25, -1, -1, -1, -1, -1, -1, },

  372.             { 26, 27, 28, -1, -1, -1, -1, -1, },

  373.         };

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

  375.     }

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

  377.         return ret;

  378. 

  379.     venc->nmappings = 1;

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

  381.     if (!venc->mappings)

  382.         return AVERROR(ENOMEM);

  383. 

  384.     // single mapping

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

  386.     mc->submaps = 1;

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

  388.     if (!mc->mux)

  389.         return AVERROR(ENOMEM);

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

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

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

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

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

  395.         return AVERROR(ENOMEM);

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

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

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

  399.     }

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

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

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

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

  404.         return AVERROR(ENOMEM);

  405.     if (mc->coupling_steps) {

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

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

  408.     }

  409. 

  410.     venc->nmodes = 1;

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

  412.     if (!venc->modes)

  413.         return AVERROR(ENOMEM);

  414. 

  415.     // single mode

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

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

  418. 

  419.     venc->have_saved = 0;

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

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

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

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

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

  425.         return AVERROR(ENOMEM);

  426. 

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

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

  429. 

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

  431.         return ret;

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

  433.         return ret;

  434. 

  435.     return 0;

  436. }

  437. 

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

  439. {

  440.     int exp, mant;

  441.     uint32_t res = 0;

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

  443.     exp += 788 - 20;

  444.     if (mant < 0) {

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

  446.         mant = -mant;

  447.     }

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

  449.     put_bits32(pb, res);

  450. }

  451. 

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

  453. {

  454.     int i;

  455.     int ordered = 0;

  456. 

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

  458.     put_bits(pb, 16, cb->ndimensions);

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

  460. 

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

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

  463.             break;

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

  465.         ordered = 1;

  466. 

  467.     put_bits(pb, 1, ordered);

  468.     if (ordered) {

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

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

  471.         i = 0;

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

  473.             int j;

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

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

  476.                     break;

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

  478.             i += j;

  479.             len++;

  480.         }

  481.     } else {

  482.         int sparse = 0;

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

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

  485.                 break;

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

  487.             sparse = 1;

  488.         put_bits(pb, 1, sparse);

  489. 

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

  491.             if (sparse)

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

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

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

  495.         }

  496.     }

  497. 

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

  499.     if (cb->lookup) {

  500.         int tmp  = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);

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

  502. 

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

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

  505. 

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

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

  508. 

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

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

  511. 

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

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

  514.     }

  515. }

  516. 

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

  518. {

  519.     int i;

  520. 

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

  522. 

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

  524. 

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

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

  527. 

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

  529.         int j, books;

  530. 

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

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

  533. 

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

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

  536. 

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

  538. 

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

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

  541.     }

  542. 

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

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

  545. 

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

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

  548. }

  549. 

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

  551. {

  552.     int i;

  553. 

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

  555. 

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

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

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

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

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

  561. 

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

  563.         int j, tmp = 0;

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

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

  566. 

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

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

  569. 

  570.         if (tmp > 7)

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

  572.     }

  573. 

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

  575.         int j;

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

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

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

  579.     }

  580. }

  581. 

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

  583. {

  584.     int i;

  585.     PutBitContext pb;

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

  587.     int buffer_len = sizeof buffer;

  588.     int len, hlens[3];

  589. 

  590.     // identification header

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

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

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

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

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

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

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

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

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

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

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

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

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

  604. 

  605.     flush_put_bits(&pb);

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

  607.     buffer_len -= hlens[0];

  608.     p += hlens[0];

  609. 

  610.     // comment header

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

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

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

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

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

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

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

  618. 

  619.     flush_put_bits(&pb);

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

  621.     buffer_len -= hlens[1];

  622.     p += hlens[1];

  623. 

  624.     // setup header

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

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

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

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

  629. 

  630.     // codebooks

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

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

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

  634. 

  635.     // time domain, reserved, zero

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

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

  638. 

  639.     // floors

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

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

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

  643. 

  644.     // residues

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

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

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

  648. 

  649.     // mappings

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

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

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

  653.         int j;

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

  655. 

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

  657.         if (mc->submaps > 1)

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

  659. 

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

  661.         if (mc->coupling_steps) {

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

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

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

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

  666.             }

  667.         }

  668. 

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

  670. 

  671.         if (mc->submaps > 1)

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

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

  674. 

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

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

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

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

  679.         }

  680.     }

  681. 

  682.     // modes

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

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

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

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

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

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

  689.     }

  690. 

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

  692. 

  693.     flush_put_bits(&pb);

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

  695. 

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

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

  698.     if (!p)

  699.         return AVERROR(ENOMEM);

  700. 

  701.     *p++ = 2;

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

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

  704.     buffer_len = 0;

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

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

  707.         p += hlens[i];

  708.         buffer_len += hlens[i];

  709.     }

  710. 

  711.     return p - *out;

  712. }

  713. 

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

  715. {

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

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

  718.     int j;

  719.     float average = 0;

  720. 

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

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

  723.     return average / (end - begin);

  724. }

  725. 

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

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

  728. {

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

  730.     int i;

  731.     float tot_average = 0.0;

  732.     float averages[MAX_FLOOR_VALUES];

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

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

  735.         tot_average += averages[i];

  736.     }

  737.     tot_average /= fc->values;

  738.     tot_average /= venc->quality;

  739. 

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

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

  742.         float average = averages[i];

  743.         int j;

  744. 

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

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

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

  748.                 break;

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

  750.     }

  751. }

  752. 

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

  754. {

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

  756. }

  757. 

  758. static int floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,

  759.                         PutBitContext *pb, uint16_t *posts,

  760.                         float *floor, int samples)

  761. {

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

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

  764.     int i, counter;

  765. 

  766.     if (pb->size_in_bits - put_bits_count(pb) < 1 + 2 * ilog(range - 1))

  767.         return AVERROR(EINVAL);

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

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

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

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

  772. 

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

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

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

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

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

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

  779.         int highroom = range - predicted;

  780.         int lowroom = predicted;

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

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

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

  784.             continue;

  785.         } else {

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

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

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

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

  790.         }

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

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

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

  794.             else

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

  796.         } else {

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

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

  799.             else

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

  801.         }

  802.     }

  803. 

  804.     counter = 2;

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

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

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

  808.         if (c->subclass) {

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

  810.             int cshift = 0;

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

  812.                 int l;

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

  814.                     int maxval = 1;

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

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

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

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

  819.                         break;

  820.                 }

  821.                 assert(l != csub);

  822.                 cval   |= l << cshift;

  823.                 cshift += c->subclass;

  824.             }

  825.             if (put_codeword(pb, book, cval))

  826.                 return AVERROR(EINVAL);

  827.         }

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

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

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

  831.             cval >>= c->subclass;

  832.             if (book == -1)

  833.                 continue;

  834.             if (entry == -1)

  835.                 entry = 0;

  836.             if (put_codeword(pb, &venc->codebooks[book], entry))

  837.                 return AVERROR(EINVAL);

  838.         }

  839.     }

  840. 

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

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

  843. 

  844.     return 0;

  845. }

  846. 

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

  848.                          float *num)

  849. {

  850.     int i, entry = -1;

  851.     float distance = FLT_MAX;

  852.     assert(book->dimensions);

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

  854.         float * vec = book->dimensions + i * book->ndimensions, d = book->pow2[i];

  855.         int j;

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

  857.             continue;

  858.         for (j = 0; j < book->ndimensions; j++)

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

  860.         if (distance > d) {

  861.             entry    = i;

  862.             distance = d;

  863.         }

  864.     }

  865.     if (put_codeword(pb, book, entry))

  866.         return NULL;

  867.     return &book->dimensions[entry * book->ndimensions];

  868. }

  869. 

  870. static int residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,

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

  872.                           int real_ch)

  873. {

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

  875.     int psize      = rc->partition_size;

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

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

  878.     int classes[MAX_CHANNELS][NUM_RESIDUE_PARTITIONS];

  879.     int classwords = venc->codebooks[rc->classbook].ndimensions;

  880. 

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

  882.     assert(real_ch == 2);

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

  884.         float max1 = 0.0, max2 = 0.0;

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

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

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

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

  889.         }

  890. 

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

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

  893.                 break;

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

  895.     }

  896. 

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

  898.         p = 0;

  899.         while (p < partitions) {

  900.             if (pass == 0)

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

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

  903.                     int entry = 0;

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

  905.                         entry *= rc->classifications;

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

  907.                     }

  908.                     if (put_codeword(pb, book, entry))

  909.                         return AVERROR(EINVAL);

  910.                 }

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

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

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

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

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

  916.                     if (nbook == -1)

  917.                         continue;

  918. 

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

  920.                     assert(!(psize % book->ndimensions));

  921. 

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

  923.                         for (k = 0; k < psize; k += book->ndimensions) {

  924.                             int l;

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

  926.                             if (!a)

  927.                                 return AVERROR(EINVAL);

  928.                             for (l = 0; l < book->ndimensions; l++)

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

  930.                         }

  931.                     } else {

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

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

  934.                         b1 =  s / real_ch;

  935.                         s  = real_ch * samples;

  936.                         for (k = 0; k < psize; k += book->ndimensions) {

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

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

  939.                             for (dim = book->ndimensions; dim--; ) {

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

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

  942.                                     a2 = 0;

  943.                                     b2++;

  944.                                 }

  945.                             }

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

  947.                             if (!pv)

  948.                                 return AVERROR(EINVAL);

  949.                             for (dim = book->ndimensions; dim--; ) {

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

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

  952.                                     a1 = 0;

  953.                                     b1++;

  954.                                 }

  955.                             }

  956.                         }

  957.                     }

  958.                 }

  959.             }

  960.         }

  961.     }

  962.     return 0;

  963. }

  964. 

  965. static int apply_window_and_mdct(vorbis_enc_context *venc,

  966.                                  float **audio, int samples)

  967. {

  968.     int i, channel;

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

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

  971.     float n = (float)(1 << venc->log2_blocksize[0]) / 4.0;

  972.     // FIXME use dsp

  973. 

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

  975.         return 0;

  976. 

  977.     if (venc->have_saved) {

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

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

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

  981.     } else {

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

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

  984.                    sizeof(float) * window_len);

  985.     }

  986. 

  987.     if (samples) {

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

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

  990.             for (i = 0; i < samples; i++)

  991.                 offset[i] = audio[channel][i] / n * win[window_len - i - 1];

  992.         }

  993.     } else {

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

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

  996.                    0, sizeof(float) * window_len);

  997.     }

  998. 

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

  1000.         venc->mdct[0].mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,

  1001.                      venc->samples + channel * window_len * 2);

  1002. 

  1003.     if (samples) {

  1004.         for (channel = 0; channel < venc->channels; channel++) {

  1005.             float *offset = venc->saved + channel * window_len;

  1006.             for (i = 0; i < samples; i++)

  1007.                 offset[i] = audio[channel][i] / n * win[i];

  1008.         }

  1009.         venc->have_saved = 1;

  1010.     } else {

  1011.         venc->have_saved = 0;

  1012.     }

  1013.     return 1;

  1014. }

  1015. 

  1016. 

  1017. static int vorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,

  1018.                                const AVFrame *frame, int *got_packet_ptr)

  1019. {

  1020.     vorbis_enc_context *venc = avctx->priv_data;

  1021.     float **audio = frame ? (float **)frame->extended_data : NULL;

  1022.     int samples = frame ? frame->nb_samples : 0;

  1023.     vorbis_enc_mode *mode;

  1024.     vorbis_enc_mapping *mapping;

  1025.     PutBitContext pb;

  1026.     int i, ret;

  1027. 

  1028.     if (!apply_window_and_mdct(venc, audio, samples))

  1029.         return 0;

  1030.     samples = 1 << (venc->log2_blocksize[0] - 1);

  1031. 

  1032.     if ((ret = ff_alloc_packet(avpkt, 8192))) {

  1033.         av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");

  1034.         return ret;

  1035.     }

  1036. 

  1037.     init_put_bits(&pb, avpkt->data, avpkt->size);

  1038. 

  1039.     if (pb.size_in_bits - put_bits_count(&pb) < 1 + ilog(venc->nmodes - 1)) {

  1040.         av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");

  1041.         return AVERROR(EINVAL);

  1042.     }

  1043. 

  1044.     put_bits(&pb, 1, 0); // magic bit

  1045. 

  1046.     put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode

  1047. 

  1048.     mode    = &venc->modes[0];

  1049.     mapping = &venc->mappings[mode->mapping];

  1050.     if (mode->blockflag) {

  1051.         put_bits(&pb, 1, 0);

  1052.         put_bits(&pb, 1, 0);

  1053.     }

  1054. 

  1055.     for (i = 0; i < venc->channels; i++) {

  1056.         vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];

  1057.         uint16_t posts[MAX_FLOOR_VALUES];

  1058.         floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);

  1059.         if (floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples)) {

  1060.             av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");

  1061.             return AVERROR(EINVAL);

  1062.         }

  1063.     }

  1064. 

  1065.     for (i = 0; i < venc->channels * samples; i++)

  1066.         venc->coeffs[i] /= venc->floor[i];

  1067. 

  1068.     for (i = 0; i < mapping->coupling_steps; i++) {

  1069.         float *mag = venc->coeffs + mapping->magnitude[i] * samples;

  1070.         float *ang = venc->coeffs + mapping->angle[i]     * samples;

  1071.         int j;

  1072.         for (j = 0; j < samples; j++) {

  1073.             float a = ang[j];

  1074.             ang[j] -= mag[j];

  1075.             if (mag[j] > 0)

  1076.                 ang[j] = -ang[j];

  1077.             if (ang[j] < 0)

  1078.                 mag[j] = a;

  1079.         }

  1080.     }

  1081. 

  1082.     if (residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],

  1083.                        &pb, venc->coeffs, samples, venc->channels)) {

  1084.         av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");

  1085.         return AVERROR(EINVAL);

  1086.     }

  1087. 

  1088.     flush_put_bits(&pb);

  1089.     avpkt->size = put_bits_count(&pb) >> 3;

  1090. 

  1091.     avpkt->duration = ff_samples_to_time_base(avctx, avctx->frame_size);

  1092.     if (frame)

  1093.         if (frame->pts != AV_NOPTS_VALUE)

  1094.             avpkt->pts = ff_samples_to_time_base(avctx, frame->pts);

  1095.     else

  1096.         avpkt->pts = venc->next_pts;

  1097.     if (avpkt->pts != AV_NOPTS_VALUE)

  1098.         venc->next_pts = avpkt->pts + avpkt->duration;

  1099. 

  1100.     *got_packet_ptr = 1;

  1101.     return 0;

  1102. }

  1103. 

  1104. 

  1105. static av_cold int vorbis_encode_close(AVCodecContext *avctx)

  1106. {

  1107.     vorbis_enc_context *venc = avctx->priv_data;

  1108.     int i;

  1109. 

  1110.     if (venc->codebooks)

  1111.         for (i = 0; i < venc->ncodebooks; i++) {

  1112.             av_freep(&venc->codebooks[i].lens);

  1113.             av_freep(&venc->codebooks[i].codewords);

  1114.             av_freep(&venc->codebooks[i].quantlist);

  1115.             av_freep(&venc->codebooks[i].dimensions);

  1116.             av_freep(&venc->codebooks[i].pow2);

  1117.         }

  1118.     av_freep(&venc->codebooks);

  1119. 

  1120.     if (venc->floors)

  1121.         for (i = 0; i < venc->nfloors; i++) {

  1122.             int j;

  1123.             if (venc->floors[i].classes)

  1124.                 for (j = 0; j < venc->floors[i].nclasses; j++)

  1125.                     av_freep(&venc->floors[i].classes[j].books);

  1126.             av_freep(&venc->floors[i].classes);

  1127.             av_freep(&venc->floors[i].partition_to_class);

  1128.             av_freep(&venc->floors[i].list);

  1129.         }

  1130.     av_freep(&venc->floors);

  1131. 

  1132.     if (venc->residues)

  1133.         for (i = 0; i < venc->nresidues; i++) {

  1134.             av_freep(&venc->residues[i].books);

  1135.             av_freep(&venc->residues[i].maxes);

  1136.         }

  1137.     av_freep(&venc->residues);

  1138. 

  1139.     if (venc->mappings)

  1140.         for (i = 0; i < venc->nmappings; i++) {

  1141.             av_freep(&venc->mappings[i].mux);

  1142.             av_freep(&venc->mappings[i].floor);

  1143.             av_freep(&venc->mappings[i].residue);

  1144.             av_freep(&venc->mappings[i].magnitude);

  1145.             av_freep(&venc->mappings[i].angle);

  1146.         }

  1147.     av_freep(&venc->mappings);

  1148. 

  1149.     av_freep(&venc->modes);

  1150. 

  1151.     av_freep(&venc->saved);

  1152.     av_freep(&venc->samples);

  1153.     av_freep(&venc->floor);

  1154.     av_freep(&venc->coeffs);

  1155. 

  1156.     ff_mdct_end(&venc->mdct[0]);

  1157.     ff_mdct_end(&venc->mdct[1]);

  1158. 

  1159.     av_freep(&avctx->extradata);

  1160. 

  1161.     return 0 ;

  1162. }

  1163. 

  1164. static av_cold int vorbis_encode_init(AVCodecContext *avctx)

  1165. {

  1166.     vorbis_enc_context *venc = avctx->priv_data;

  1167.     int ret;

  1168. 

  1169.     if (avctx->channels != 2) {

  1170.         av_log(avctx, AV_LOG_ERROR, "Current Libav Vorbis encoder only supports 2 channels.\n");

  1171.         return -1;

  1172.     }

  1173. 

  1174.     if ((ret = create_vorbis_context(venc, avctx)) < 0)

  1175.         goto error;

  1176. 

  1177.     avctx->bit_rate = 0;

  1178.     if (avctx->flags & CODEC_FLAG_QSCALE)

  1179.         venc->quality = avctx->global_quality / (float)FF_QP2LAMBDA;

  1180.     else

  1181.         venc->quality = 3.0;

  1182.     venc->quality *= venc->quality;

  1183. 

  1184.     if ((ret = put_main_header(venc, (uint8_t**)&avctx->extradata)) < 0)

  1185.         goto error;

  1186.     avctx->extradata_size = ret;

  1187. 

  1188.     avctx->frame_size = 1 << (venc->log2_blocksize[0] - 1);

  1189. 

  1190.     return 0;

  1191. error:

  1192.     vorbis_encode_close(avctx);

  1193.     return ret;

  1194. }

  1195. 

  1196. AVCodec ff_vorbis_encoder = {

  1197.     .name           = "vorbis",

  1198.     .long_name      = NULL_IF_CONFIG_SMALL("Vorbis"),

  1199.     .type           = AVMEDIA_TYPE_AUDIO,

  1200.     .id             = AV_CODEC_ID_VORBIS,

  1201.     .priv_data_size = sizeof(vorbis_enc_context),

  1202.     .init           = vorbis_encode_init,

  1203.     .encode2        = vorbis_encode_frame,

  1204.     .close          = vorbis_encode_close,

  1205.     .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL,

  1206.     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,

  1207.                                                      AV_SAMPLE_FMT_NONE },

  1208. };