FFmpeg: libavcodec/vorbisenc.c Source File

00001 /*
00002  * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00027 #include <float.h>
00028 #include "avcodec.h"
00029 #include "dsputil.h"
00030 #include "fft.h"
00031 #include "vorbis.h"
00032 #include "vorbis_enc_data.h"
00033 
00034 #define BITSTREAM_WRITER_LE
00035 #include "put_bits.h"
00036 
00037 #undef NDEBUG
00038 #include <assert.h>
00039 
00040 typedef struct {
00041     int nentries;
00042     uint8_t *lens;
00043     uint32_t *codewords;
00044     int ndimentions;
00045     float min;
00046     float delta;
00047     int seq_p;
00048     int lookup;
00049     int *quantlist;
00050     float *dimentions;
00051     float *pow2;
00052 } vorbis_enc_codebook;
00053 
00054 typedef struct {
00055     int dim;
00056     int subclass;
00057     int masterbook;
00058     int *books;
00059 } vorbis_enc_floor_class;
00060 
00061 typedef struct {
00062     int partitions;
00063     int *partition_to_class;
00064     int nclasses;
00065     vorbis_enc_floor_class *classes;
00066     int multiplier;
00067     int rangebits;
00068     int values;
00069     vorbis_floor1_entry *list;
00070 } vorbis_enc_floor;
00071 
00072 typedef struct {
00073     int type;
00074     int begin;
00075     int end;
00076     int partition_size;
00077     int classifications;
00078     int classbook;
00079     int8_t (*books)[8];
00080     float (*maxes)[2];
00081 } vorbis_enc_residue;
00082 
00083 typedef struct {
00084     int submaps;
00085     int *mux;
00086     int *floor;
00087     int *residue;
00088     int coupling_steps;
00089     int *magnitude;
00090     int *angle;
00091 } vorbis_enc_mapping;
00092 
00093 typedef struct {
00094     int blockflag;
00095     int mapping;
00096 } vorbis_enc_mode;
00097 
00098 typedef struct {
00099     int channels;
00100     int sample_rate;
00101     int log2_blocksize[2];
00102     FFTContext mdct[2];
00103     const float *win[2];
00104     int have_saved;
00105     float *saved;
00106     float *samples;
00107     float *floor;  // also used for tmp values for mdct
00108     float *coeffs; // also used for residue after floor
00109     float quality;
00110 
00111     int ncodebooks;
00112     vorbis_enc_codebook *codebooks;
00113 
00114     int nfloors;
00115     vorbis_enc_floor *floors;
00116 
00117     int nresidues;
00118     vorbis_enc_residue *residues;
00119 
00120     int nmappings;
00121     vorbis_enc_mapping *mappings;
00122 
00123     int nmodes;
00124     vorbis_enc_mode *modes;
00125 
00126     int64_t sample_count;
00127 } vorbis_enc_context;
00128 
00129 #define MAX_CHANNELS     2
00130 #define MAX_CODEBOOK_DIM 8
00131 
00132 #define MAX_FLOOR_CLASS_DIM  4
00133 #define NUM_FLOOR_PARTITIONS 8
00134 #define MAX_FLOOR_VALUES     (MAX_FLOOR_CLASS_DIM*NUM_FLOOR_PARTITIONS+2)
00135 
00136 #define RESIDUE_SIZE           1600
00137 #define RESIDUE_PART_SIZE      32
00138 #define NUM_RESIDUE_PARTITIONS (RESIDUE_SIZE/RESIDUE_PART_SIZE)
00139 
00140 static inline void put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb,
00141                                 int entry)
00142 {
00143     assert(entry >= 0);
00144     assert(entry < cb->nentries);
00145     assert(cb->lens[entry]);
00146     put_bits(pb, cb->lens[entry], cb->codewords[entry]);
00147 }
00148 
00149 static int cb_lookup_vals(int lookup, int dimentions, int entries)
00150 {
00151     if (lookup == 1)
00152         return ff_vorbis_nth_root(entries, dimentions);
00153     else if (lookup == 2)
00154         return dimentions *entries;
00155     return 0;
00156 }
00157 
00158 static int ready_codebook(vorbis_enc_codebook *cb)
00159 {
00160     int i;
00161 
00162     ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
00163 
00164     if (!cb->lookup) {
00165         cb->pow2 = cb->dimentions = NULL;
00166     } else {
00167         int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
00168         cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions);
00169         cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
00170         if (!cb->dimentions || !cb->pow2)
00171             return AVERROR(ENOMEM);
00172         for (i = 0; i < cb->nentries; i++) {
00173             float last = 0;
00174             int j;
00175             int div = 1;
00176             for (j = 0; j < cb->ndimentions; j++) {
00177                 int off;
00178                 if (cb->lookup == 1)
00179                     off = (i / div) % vals; // lookup type 1
00180                 else
00181                     off = i * cb->ndimentions + j; // lookup type 2
00182 
00183                 cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
00184                 if (cb->seq_p)
00185                     last = cb->dimentions[i * cb->ndimentions + j];
00186                 cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j] * cb->dimentions[i * cb->ndimentions + j];
00187                 div *= vals;
00188             }
00189             cb->pow2[i] /= 2.;
00190         }
00191     }
00192     return 0;
00193 }
00194 
00195 static int ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc)
00196 {
00197     int i;
00198     assert(rc->type == 2);
00199     rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
00200     if (!rc->maxes)
00201         return AVERROR(ENOMEM);
00202     for (i = 0; i < rc->classifications; i++) {
00203         int j;
00204         vorbis_enc_codebook * cb;
00205         for (j = 0; j < 8; j++)
00206             if (rc->books[i][j] != -1)
00207                 break;
00208         if (j == 8) // zero
00209             continue;
00210         cb = &venc->codebooks[rc->books[i][j]];
00211         assert(cb->ndimentions >= 2);
00212         assert(cb->lookup);
00213 
00214         for (j = 0; j < cb->nentries; j++) {
00215             float a;
00216             if (!cb->lens[j])
00217                 continue;
00218             a = fabs(cb->dimentions[j * cb->ndimentions]);
00219             if (a > rc->maxes[i][0])
00220                 rc->maxes[i][0] = a;
00221             a = fabs(cb->dimentions[j * cb->ndimentions + 1]);
00222             if (a > rc->maxes[i][1])
00223                 rc->maxes[i][1] = a;
00224         }
00225     }
00226     // small bias
00227     for (i = 0; i < rc->classifications; i++) {
00228         rc->maxes[i][0] += 0.8;
00229         rc->maxes[i][1] += 0.8;
00230     }
00231     return 0;
00232 }
00233 
00234 static int create_vorbis_context(vorbis_enc_context *venc,
00235                                  AVCodecContext *avccontext)
00236 {
00237     vorbis_enc_floor   *fc;
00238     vorbis_enc_residue *rc;
00239     vorbis_enc_mapping *mc;
00240     int i, book, ret;
00241 
00242     venc->channels    = avccontext->channels;
00243     venc->sample_rate = avccontext->sample_rate;
00244     venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
00245 
00246     venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);
00247     venc->codebooks  = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
00248     if (!venc->codebooks)
00249         return AVERROR(ENOMEM);
00250 
00251     // codebook 0..14 - floor1 book, values 0..255
00252     // codebook 15 residue masterbook
00253     // codebook 16..29 residue
00254     for (book = 0; book < venc->ncodebooks; book++) {
00255         vorbis_enc_codebook *cb = &venc->codebooks[book];
00256         int vals;
00257         cb->ndimentions = cvectors[book].dim;
00258         cb->nentries    = cvectors[book].real_len;
00259         cb->min         = cvectors[book].min;
00260         cb->delta       = cvectors[book].delta;
00261         cb->lookup      = cvectors[book].lookup;
00262         cb->seq_p       = 0;
00263 
00264         cb->lens      = av_malloc(sizeof(uint8_t)  * cb->nentries);
00265         cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
00266         if (!cb->lens || !cb->codewords)
00267             return AVERROR(ENOMEM);
00268         memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
00269         memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
00270 
00271         if (cb->lookup) {
00272             vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
00273             cb->quantlist = av_malloc(sizeof(int) * vals);
00274             if (!cb->quantlist)
00275                 return AVERROR(ENOMEM);
00276             for (i = 0; i < vals; i++)
00277                 cb->quantlist[i] = cvectors[book].quant[i];
00278         } else {
00279             cb->quantlist = NULL;
00280         }
00281         if ((ret = ready_codebook(cb)) < 0)
00282             return ret;
00283     }
00284 
00285     venc->nfloors = 1;
00286     venc->floors  = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);
00287     if (!venc->floors)
00288         return AVERROR(ENOMEM);
00289 
00290     // just 1 floor
00291     fc = &venc->floors[0];
00292     fc->partitions         = NUM_FLOOR_PARTITIONS;
00293     fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
00294     if (!fc->partition_to_class)
00295         return AVERROR(ENOMEM);
00296     fc->nclasses           = 0;
00297     for (i = 0; i < fc->partitions; i++) {
00298         static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4};
00299         fc->partition_to_class[i] = a[i];
00300         fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
00301     }
00302     fc->nclasses++;
00303     fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses);
00304     if (!fc->classes)
00305         return AVERROR(ENOMEM);
00306     for (i = 0; i < fc->nclasses; i++) {
00307         vorbis_enc_floor_class * c = &fc->classes[i];
00308         int j, books;
00309         c->dim        = floor_classes[i].dim;
00310         c->subclass   = floor_classes[i].subclass;
00311         c->masterbook = floor_classes[i].masterbook;
00312         books         = (1 << c->subclass);
00313         c->books      = av_malloc(sizeof(int) * books);
00314         if (!c->books)
00315             return AVERROR(ENOMEM);
00316         for (j = 0; j < books; j++)
00317             c->books[j] = floor_classes[i].nbooks[j];
00318     }
00319     fc->multiplier = 2;
00320     fc->rangebits  = venc->log2_blocksize[0] - 1;
00321 
00322     fc->values = 2;
00323     for (i = 0; i < fc->partitions; i++)
00324         fc->values += fc->classes[fc->partition_to_class[i]].dim;
00325 
00326     fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);
00327     if (!fc->list)
00328         return AVERROR(ENOMEM);
00329     fc->list[0].x = 0;
00330     fc->list[1].x = 1 << fc->rangebits;
00331     for (i = 2; i < fc->values; i++) {
00332         static const int a[] = {
00333              93, 23,372,  6, 46,186,750, 14, 33, 65,
00334             130,260,556,  3, 10, 18, 28, 39, 55, 79,
00335             111,158,220,312,464,650,850
00336         };
00337         fc->list[i].x = a[i - 2];
00338     }
00339     if (ff_vorbis_ready_floor1_list(avccontext, fc->list, fc->values))
00340         return AVERROR_BUG;
00341 
00342     venc->nresidues = 1;
00343     venc->residues  = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
00344     if (!venc->residues)
00345         return AVERROR(ENOMEM);
00346 
00347     // single residue
00348     rc = &venc->residues[0];
00349     rc->type            = 2;
00350     rc->begin           = 0;
00351     rc->end             = 1600;
00352     rc->partition_size  = 32;
00353     rc->classifications = 10;
00354     rc->classbook       = 15;
00355     rc->books           = av_malloc(sizeof(*rc->books) * rc->classifications);
00356     if (!rc->books)
00357         return AVERROR(ENOMEM);
00358     {
00359         static const int8_t a[10][8] = {
00360             { -1, -1, -1, -1, -1, -1, -1, -1, },
00361             { -1, -1, 16, -1, -1, -1, -1, -1, },
00362             { -1, -1, 17, -1, -1, -1, -1, -1, },
00363             { -1, -1, 18, -1, -1, -1, -1, -1, },
00364             { -1, -1, 19, -1, -1, -1, -1, -1, },
00365             { -1, -1, 20, -1, -1, -1, -1, -1, },
00366             { -1, -1, 21, -1, -1, -1, -1, -1, },
00367             { 22, 23, -1, -1, -1, -1, -1, -1, },
00368             { 24, 25, -1, -1, -1, -1, -1, -1, },
00369             { 26, 27, 28, -1, -1, -1, -1, -1, },
00370         };
00371         memcpy(rc->books, a, sizeof a);
00372     }
00373     if ((ret = ready_residue(rc, venc)) < 0)
00374         return ret;
00375 
00376     venc->nmappings = 1;
00377     venc->mappings  = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
00378     if (!venc->mappings)
00379         return AVERROR(ENOMEM);
00380 
00381     // single mapping
00382     mc = &venc->mappings[0];
00383     mc->submaps = 1;
00384     mc->mux     = av_malloc(sizeof(int) * venc->channels);
00385     if (!mc->mux)
00386         return AVERROR(ENOMEM);
00387     for (i = 0; i < venc->channels; i++)
00388         mc->mux[i] = 0;
00389     mc->floor   = av_malloc(sizeof(int) * mc->submaps);
00390     mc->residue = av_malloc(sizeof(int) * mc->submaps);
00391     if (!mc->floor || !mc->residue)
00392         return AVERROR(ENOMEM);
00393     for (i = 0; i < mc->submaps; i++) {
00394         mc->floor[i]   = 0;
00395         mc->residue[i] = 0;
00396     }
00397     mc->coupling_steps = venc->channels == 2 ? 1 : 0;
00398     mc->magnitude      = av_malloc(sizeof(int) * mc->coupling_steps);
00399     mc->angle          = av_malloc(sizeof(int) * mc->coupling_steps);
00400     if (!mc->magnitude || !mc->angle)
00401         return AVERROR(ENOMEM);
00402     if (mc->coupling_steps) {
00403         mc->magnitude[0] = 0;
00404         mc->angle[0]     = 1;
00405     }
00406 
00407     venc->nmodes = 1;
00408     venc->modes  = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
00409     if (!venc->modes)
00410         return AVERROR(ENOMEM);
00411 
00412     // single mode
00413     venc->modes[0].blockflag = 0;
00414     venc->modes[0].mapping   = 0;
00415 
00416     venc->have_saved = 0;
00417     venc->saved      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
00418     venc->samples    = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
00419     venc->floor      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
00420     venc->coeffs     = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
00421     if (!venc->saved || !venc->samples || !venc->floor || !venc->coeffs)
00422         return AVERROR(ENOMEM);
00423 
00424     venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
00425     venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
00426 
00427     if ((ret = ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0)) < 0)
00428         return ret;
00429     if ((ret = ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0)) < 0)
00430         return ret;
00431 
00432     return 0;
00433 }
00434 
00435 static void put_float(PutBitContext *pb, float f)
00436 {
00437     int exp, mant;
00438     uint32_t res = 0;
00439     mant = (int)ldexp(frexp(f, &exp), 20);
00440     exp += 788 - 20;
00441     if (mant < 0) {
00442         res |= (1U << 31);
00443         mant = -mant;
00444     }
00445     res |= mant | (exp << 21);
00446     put_bits32(pb, res);
00447 }
00448 
00449 static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb)
00450 {
00451     int i;
00452     int ordered = 0;
00453 
00454     put_bits(pb, 24, 0x564342); //magic
00455     put_bits(pb, 16, cb->ndimentions);
00456     put_bits(pb, 24, cb->nentries);
00457 
00458     for (i = 1; i < cb->nentries; i++)
00459         if (cb->lens[i] < cb->lens[i-1])
00460             break;
00461     if (i == cb->nentries)
00462         ordered = 1;
00463 
00464     put_bits(pb, 1, ordered);
00465     if (ordered) {
00466         int len = cb->lens[0];
00467         put_bits(pb, 5, len - 1);
00468         i = 0;
00469         while (i < cb->nentries) {
00470             int j;
00471             for (j = 0; j+i < cb->nentries; j++)
00472                 if (cb->lens[j+i] != len)
00473                     break;
00474             put_bits(pb, ilog(cb->nentries - i), j);
00475             i += j;
00476             len++;
00477         }
00478     } else {
00479         int sparse = 0;
00480         for (i = 0; i < cb->nentries; i++)
00481             if (!cb->lens[i])
00482                 break;
00483         if (i != cb->nentries)
00484             sparse = 1;
00485         put_bits(pb, 1, sparse);
00486 
00487         for (i = 0; i < cb->nentries; i++) {
00488             if (sparse)
00489                 put_bits(pb, 1, !!cb->lens[i]);
00490             if (cb->lens[i])
00491                 put_bits(pb, 5, cb->lens[i] - 1);
00492         }
00493     }
00494 
00495     put_bits(pb, 4, cb->lookup);
00496     if (cb->lookup) {
00497         int tmp  = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
00498         int bits = ilog(cb->quantlist[0]);
00499 
00500         for (i = 1; i < tmp; i++)
00501             bits = FFMAX(bits, ilog(cb->quantlist[i]));
00502 
00503         put_float(pb, cb->min);
00504         put_float(pb, cb->delta);
00505 
00506         put_bits(pb, 4, bits - 1);
00507         put_bits(pb, 1, cb->seq_p);
00508 
00509         for (i = 0; i < tmp; i++)
00510             put_bits(pb, bits, cb->quantlist[i]);
00511     }
00512 }
00513 
00514 static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc)
00515 {
00516     int i;
00517 
00518     put_bits(pb, 16, 1); // type, only floor1 is supported
00519 
00520     put_bits(pb, 5, fc->partitions);
00521 
00522     for (i = 0; i < fc->partitions; i++)
00523         put_bits(pb, 4, fc->partition_to_class[i]);
00524 
00525     for (i = 0; i < fc->nclasses; i++) {
00526         int j, books;
00527 
00528         put_bits(pb, 3, fc->classes[i].dim - 1);
00529         put_bits(pb, 2, fc->classes[i].subclass);
00530 
00531         if (fc->classes[i].subclass)
00532             put_bits(pb, 8, fc->classes[i].masterbook);
00533 
00534         books = (1 << fc->classes[i].subclass);
00535 
00536         for (j = 0; j < books; j++)
00537             put_bits(pb, 8, fc->classes[i].books[j] + 1);
00538     }
00539 
00540     put_bits(pb, 2, fc->multiplier - 1);
00541     put_bits(pb, 4, fc->rangebits);
00542 
00543     for (i = 2; i < fc->values; i++)
00544         put_bits(pb, fc->rangebits, fc->list[i].x);
00545 }
00546 
00547 static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *rc)
00548 {
00549     int i;
00550 
00551     put_bits(pb, 16, rc->type);
00552 
00553     put_bits(pb, 24, rc->begin);
00554     put_bits(pb, 24, rc->end);
00555     put_bits(pb, 24, rc->partition_size - 1);
00556     put_bits(pb, 6, rc->classifications - 1);
00557     put_bits(pb, 8, rc->classbook);
00558 
00559     for (i = 0; i < rc->classifications; i++) {
00560         int j, tmp = 0;
00561         for (j = 0; j < 8; j++)
00562             tmp |= (rc->books[i][j] != -1) << j;
00563 
00564         put_bits(pb, 3, tmp & 7);
00565         put_bits(pb, 1, tmp > 7);
00566 
00567         if (tmp > 7)
00568             put_bits(pb, 5, tmp >> 3);
00569     }
00570 
00571     for (i = 0; i < rc->classifications; i++) {
00572         int j;
00573         for (j = 0; j < 8; j++)
00574             if (rc->books[i][j] != -1)
00575                 put_bits(pb, 8, rc->books[i][j]);
00576     }
00577 }
00578 
00579 static int put_main_header(vorbis_enc_context *venc, uint8_t **out)
00580 {
00581     int i;
00582     PutBitContext pb;
00583     uint8_t buffer[50000] = {0}, *p = buffer;
00584     int buffer_len = sizeof buffer;
00585     int len, hlens[3];
00586 
00587     // identification header
00588     init_put_bits(&pb, p, buffer_len);
00589     put_bits(&pb, 8, 1); //magic
00590     for (i = 0; "vorbis"[i]; i++)
00591         put_bits(&pb, 8, "vorbis"[i]);
00592     put_bits32(&pb, 0); // version
00593     put_bits(&pb,  8, venc->channels);
00594     put_bits32(&pb, venc->sample_rate);
00595     put_bits32(&pb, 0); // bitrate
00596     put_bits32(&pb, 0); // bitrate
00597     put_bits32(&pb, 0); // bitrate
00598     put_bits(&pb,  4, venc->log2_blocksize[0]);
00599     put_bits(&pb,  4, venc->log2_blocksize[1]);
00600     put_bits(&pb,  1, 1); // framing
00601 
00602     flush_put_bits(&pb);
00603     hlens[0] = put_bits_count(&pb) >> 3;
00604     buffer_len -= hlens[0];
00605     p += hlens[0];
00606 
00607     // comment header
00608     init_put_bits(&pb, p, buffer_len);
00609     put_bits(&pb, 8, 3); //magic
00610     for (i = 0; "vorbis"[i]; i++)
00611         put_bits(&pb, 8, "vorbis"[i]);
00612     put_bits32(&pb, 0); // vendor length TODO
00613     put_bits32(&pb, 0); // amount of comments
00614     put_bits(&pb,  1, 1); // framing
00615 
00616     flush_put_bits(&pb);
00617     hlens[1] = put_bits_count(&pb) >> 3;
00618     buffer_len -= hlens[1];
00619     p += hlens[1];
00620 
00621     // setup header
00622     init_put_bits(&pb, p, buffer_len);
00623     put_bits(&pb, 8, 5); //magic
00624     for (i = 0; "vorbis"[i]; i++)
00625         put_bits(&pb, 8, "vorbis"[i]);
00626 
00627     // codebooks
00628     put_bits(&pb, 8, venc->ncodebooks - 1);
00629     for (i = 0; i < venc->ncodebooks; i++)
00630         put_codebook_header(&pb, &venc->codebooks[i]);
00631 
00632     // time domain, reserved, zero
00633     put_bits(&pb,  6, 0);
00634     put_bits(&pb, 16, 0);
00635 
00636     // floors
00637     put_bits(&pb, 6, venc->nfloors - 1);
00638     for (i = 0; i < venc->nfloors; i++)
00639         put_floor_header(&pb, &venc->floors[i]);
00640 
00641     // residues
00642     put_bits(&pb, 6, venc->nresidues - 1);
00643     for (i = 0; i < venc->nresidues; i++)
00644         put_residue_header(&pb, &venc->residues[i]);
00645 
00646     // mappings
00647     put_bits(&pb, 6, venc->nmappings - 1);
00648     for (i = 0; i < venc->nmappings; i++) {
00649         vorbis_enc_mapping *mc = &venc->mappings[i];
00650         int j;
00651         put_bits(&pb, 16, 0); // mapping type
00652 
00653         put_bits(&pb, 1, mc->submaps > 1);
00654         if (mc->submaps > 1)
00655             put_bits(&pb, 4, mc->submaps - 1);
00656 
00657         put_bits(&pb, 1, !!mc->coupling_steps);
00658         if (mc->coupling_steps) {
00659             put_bits(&pb, 8, mc->coupling_steps - 1);
00660             for (j = 0; j < mc->coupling_steps; j++) {
00661                 put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
00662                 put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
00663             }
00664         }
00665 
00666         put_bits(&pb, 2, 0); // reserved
00667 
00668         if (mc->submaps > 1)
00669             for (j = 0; j < venc->channels; j++)
00670                 put_bits(&pb, 4, mc->mux[j]);
00671 
00672         for (j = 0; j < mc->submaps; j++) {
00673             put_bits(&pb, 8, 0); // reserved time configuration
00674             put_bits(&pb, 8, mc->floor[j]);
00675             put_bits(&pb, 8, mc->residue[j]);
00676         }
00677     }
00678 
00679     // modes
00680     put_bits(&pb, 6, venc->nmodes - 1);
00681     for (i = 0; i < venc->nmodes; i++) {
00682         put_bits(&pb, 1, venc->modes[i].blockflag);
00683         put_bits(&pb, 16, 0); // reserved window type
00684         put_bits(&pb, 16, 0); // reserved transform type
00685         put_bits(&pb, 8, venc->modes[i].mapping);
00686     }
00687 
00688     put_bits(&pb, 1, 1); // framing
00689 
00690     flush_put_bits(&pb);
00691     hlens[2] = put_bits_count(&pb) >> 3;
00692 
00693     len = hlens[0] + hlens[1] + hlens[2];
00694     p = *out = av_mallocz(64 + len + len/255);
00695     if (!p)
00696         return AVERROR(ENOMEM);
00697 
00698     *p++ = 2;
00699     p += av_xiphlacing(p, hlens[0]);
00700     p += av_xiphlacing(p, hlens[1]);
00701     buffer_len = 0;
00702     for (i = 0; i < 3; i++) {
00703         memcpy(p, buffer + buffer_len, hlens[i]);
00704         p += hlens[i];
00705         buffer_len += hlens[i];
00706     }
00707 
00708     return p - *out;
00709 }
00710 
00711 static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i)
00712 {
00713     int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
00714     int end   = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
00715     int j;
00716     float average = 0;
00717 
00718     for (j = begin; j < end; j++)
00719         average += fabs(coeffs[j]);
00720     return average / (end - begin);
00721 }
00722 
00723 static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc,
00724                       float *coeffs, uint16_t *posts, int samples)
00725 {
00726     int range = 255 / fc->multiplier + 1;
00727     int i;
00728     float tot_average = 0.;
00729     float averages[MAX_FLOOR_VALUES];
00730     for (i = 0; i < fc->values; i++) {
00731         averages[i] = get_floor_average(fc, coeffs, i);
00732         tot_average += averages[i];
00733     }
00734     tot_average /= fc->values;
00735     tot_average /= venc->quality;
00736 
00737     for (i = 0; i < fc->values; i++) {
00738         int position  = fc->list[fc->list[i].sort].x;
00739         float average = averages[i];
00740         int j;
00741 
00742         average = sqrt(tot_average * average) * pow(1.25f, position*0.005f); // MAGIC!
00743         for (j = 0; j < range - 1; j++)
00744             if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average)
00745                 break;
00746         posts[fc->list[i].sort] = j;
00747     }
00748 }
00749 
00750 static int render_point(int x0, int y0, int x1, int y1, int x)
00751 {
00752     return y0 +  (x - x0) * (y1 - y0) / (x1 - x0);
00753 }
00754 
00755 static void floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,
00756                          PutBitContext *pb, uint16_t *posts,
00757                          float *floor, int samples)
00758 {
00759     int range = 255 / fc->multiplier + 1;
00760     int coded[MAX_FLOOR_VALUES]; // first 2 values are unused
00761     int i, counter;
00762 
00763     put_bits(pb, 1, 1); // non zero
00764     put_bits(pb, ilog(range - 1), posts[0]);
00765     put_bits(pb, ilog(range - 1), posts[1]);
00766     coded[0] = coded[1] = 1;
00767 
00768     for (i = 2; i < fc->values; i++) {
00769         int predicted = render_point(fc->list[fc->list[i].low].x,
00770                                      posts[fc->list[i].low],
00771                                      fc->list[fc->list[i].high].x,
00772                                      posts[fc->list[i].high],
00773                                      fc->list[i].x);
00774         int highroom = range - predicted;
00775         int lowroom = predicted;
00776         int room = FFMIN(highroom, lowroom);
00777         if (predicted == posts[i]) {
00778             coded[i] = 0; // must be used later as flag!
00779             continue;
00780         } else {
00781             if (!coded[fc->list[i].low ])
00782                 coded[fc->list[i].low ] = -1;
00783             if (!coded[fc->list[i].high])
00784                 coded[fc->list[i].high] = -1;
00785         }
00786         if (posts[i] > predicted) {
00787             if (posts[i] - predicted > room)
00788                 coded[i] = posts[i] - predicted + lowroom;
00789             else
00790                 coded[i] = (posts[i] - predicted) << 1;
00791         } else {
00792             if (predicted - posts[i] > room)
00793                 coded[i] = predicted - posts[i] + highroom - 1;
00794             else
00795                 coded[i] = ((predicted - posts[i]) << 1) - 1;
00796         }
00797     }
00798 
00799     counter = 2;
00800     for (i = 0; i < fc->partitions; i++) {
00801         vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
00802         int k, cval = 0, csub = 1<<c->subclass;
00803         if (c->subclass) {
00804             vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
00805             int cshift = 0;
00806             for (k = 0; k < c->dim; k++) {
00807                 int l;
00808                 for (l = 0; l < csub; l++) {
00809                     int maxval = 1;
00810                     if (c->books[l] != -1)
00811                         maxval = venc->codebooks[c->books[l]].nentries;
00812                     // coded could be -1, but this still works, cause that is 0
00813                     if (coded[counter + k] < maxval)
00814                         break;
00815                 }
00816                 assert(l != csub);
00817                 cval   |= l << cshift;
00818                 cshift += c->subclass;
00819             }
00820             put_codeword(pb, book, cval);
00821         }
00822         for (k = 0; k < c->dim; k++) {
00823             int book  = c->books[cval & (csub-1)];
00824             int entry = coded[counter++];
00825             cval >>= c->subclass;
00826             if (book == -1)
00827                 continue;
00828             if (entry == -1)
00829                 entry = 0;
00830             put_codeword(pb, &venc->codebooks[book], entry);
00831         }
00832     }
00833 
00834     ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded,
00835                                  fc->multiplier, floor, samples);
00836 }
00837 
00838 static float *put_vector(vorbis_enc_codebook *book, PutBitContext *pb,
00839                          float *num)
00840 {
00841     int i, entry = -1;
00842     float distance = FLT_MAX;
00843     assert(book->dimentions);
00844     for (i = 0; i < book->nentries; i++) {
00845         float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i];
00846         int j;
00847         if (!book->lens[i])
00848             continue;
00849         for (j = 0; j < book->ndimentions; j++)
00850             d -= vec[j] * num[j];
00851         if (distance > d) {
00852             entry    = i;
00853             distance = d;
00854         }
00855     }
00856     put_codeword(pb, book, entry);
00857     return &book->dimentions[entry * book->ndimentions];
00858 }
00859 
00860 static void residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,
00861                            PutBitContext *pb, float *coeffs, int samples,
00862                            int real_ch)
00863 {
00864     int pass, i, j, p, k;
00865     int psize      = rc->partition_size;
00866     int partitions = (rc->end - rc->begin) / psize;
00867     int channels   = (rc->type == 2) ? 1 : real_ch;
00868     int classes[MAX_CHANNELS][NUM_RESIDUE_PARTITIONS];
00869     int classwords = venc->codebooks[rc->classbook].ndimentions;
00870 
00871     assert(rc->type == 2);
00872     assert(real_ch == 2);
00873     for (p = 0; p < partitions; p++) {
00874         float max1 = 0., max2 = 0.;
00875         int s = rc->begin + p * psize;
00876         for (k = s; k < s + psize; k += 2) {
00877             max1 = FFMAX(max1, fabs(coeffs[          k / real_ch]));
00878             max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
00879         }
00880 
00881         for (i = 0; i < rc->classifications - 1; i++)
00882             if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1])
00883                 break;
00884         classes[0][p] = i;
00885     }
00886 
00887     for (pass = 0; pass < 8; pass++) {
00888         p = 0;
00889         while (p < partitions) {
00890             if (pass == 0)
00891                 for (j = 0; j < channels; j++) {
00892                     vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
00893                     int entry = 0;
00894                     for (i = 0; i < classwords; i++) {
00895                         entry *= rc->classifications;
00896                         entry += classes[j][p + i];
00897                     }
00898                     put_codeword(pb, book, entry);
00899                 }
00900             for (i = 0; i < classwords && p < partitions; i++, p++) {
00901                 for (j = 0; j < channels; j++) {
00902                     int nbook = rc->books[classes[j][p]][pass];
00903                     vorbis_enc_codebook * book = &venc->codebooks[nbook];
00904                     float *buf = coeffs + samples*j + rc->begin + p*psize;
00905                     if (nbook == -1)
00906                         continue;
00907 
00908                     assert(rc->type == 0 || rc->type == 2);
00909                     assert(!(psize % book->ndimentions));
00910 
00911                     if (rc->type == 0) {
00912                         for (k = 0; k < psize; k += book->ndimentions) {
00913                             float *a = put_vector(book, pb, &buf[k]);
00914                             int l;
00915                             for (l = 0; l < book->ndimentions; l++)
00916                                 buf[k + l] -= a[l];
00917                         }
00918                     } else {
00919                         int s = rc->begin + p * psize, a1, b1;
00920                         a1 = (s % real_ch) * samples;
00921                         b1 =  s / real_ch;
00922                         s  = real_ch * samples;
00923                         for (k = 0; k < psize; k += book->ndimentions) {
00924                             int dim, a2 = a1, b2 = b1;
00925                             float vec[MAX_CODEBOOK_DIM], *pv = vec;
00926                             for (dim = book->ndimentions; dim--; ) {
00927                                 *pv++ = coeffs[a2 + b2];
00928                                 if ((a2 += samples) == s) {
00929                                     a2 = 0;
00930                                     b2++;
00931                                 }
00932                             }
00933                             pv = put_vector(book, pb, vec);
00934                             for (dim = book->ndimentions; dim--; ) {
00935                                 coeffs[a1 + b1] -= *pv++;
00936                                 if ((a1 += samples) == s) {
00937                                     a1 = 0;
00938                                     b1++;
00939                                 }
00940                             }
00941                         }
00942                     }
00943                 }
00944             }
00945         }
00946     }
00947 }
00948 
00949 static int apply_window_and_mdct(vorbis_enc_context *venc, const signed short *audio,
00950                                  int samples)
00951 {
00952     int i, j, channel;
00953     const float * win = venc->win[0];
00954     int window_len = 1 << (venc->log2_blocksize[0] - 1);
00955     float n = (float)(1 << venc->log2_blocksize[0]) / 4.;
00956     // FIXME use dsp
00957 
00958     if (!venc->have_saved && !samples)
00959         return 0;
00960 
00961     if (venc->have_saved) {
00962         for (channel = 0; channel < venc->channels; channel++)
00963             memcpy(venc->samples + channel * window_len * 2,
00964                    venc->saved + channel * window_len, sizeof(float) * window_len);
00965     } else {
00966         for (channel = 0; channel < venc->channels; channel++)
00967             memset(venc->samples + channel * window_len * 2, 0,
00968                    sizeof(float) * window_len);
00969     }
00970 
00971     if (samples) {
00972         for (channel = 0; channel < venc->channels; channel++) {
00973             float * offset = venc->samples + channel*window_len*2 + window_len;
00974             j = channel;
00975             for (i = 0; i < samples; i++, j += venc->channels)
00976                 offset[i] = audio[j] / 32768. / n * win[window_len - i - 1];
00977         }
00978     } else {
00979         for (channel = 0; channel < venc->channels; channel++)
00980             memset(venc->samples + channel * window_len * 2 + window_len,
00981                    0, sizeof(float) * window_len);
00982     }
00983 
00984     for (channel = 0; channel < venc->channels; channel++)
00985         venc->mdct[0].mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,
00986                      venc->samples + channel * window_len * 2);
00987 
00988     if (samples) {
00989         for (channel = 0; channel < venc->channels; channel++) {
00990             float *offset = venc->saved + channel * window_len;
00991             j = channel;
00992             for (i = 0; i < samples; i++, j += venc->channels)
00993                 offset[i] = audio[j] / 32768. / n * win[i];
00994         }
00995         venc->have_saved = 1;
00996     } else {
00997         venc->have_saved = 0;
00998     }
00999     return 1;
01000 }
01001 
01002 static int vorbis_encode_frame(AVCodecContext *avccontext,
01003                                unsigned char *packets,
01004                                int buf_size, void *data)
01005 {
01006     vorbis_enc_context *venc = avccontext->priv_data;
01007     const signed short *audio = data;
01008     int samples = data ? avccontext->frame_size : 0;
01009     vorbis_enc_mode *mode;
01010     vorbis_enc_mapping *mapping;
01011     PutBitContext pb;
01012     int i;
01013 
01014     if (!apply_window_and_mdct(venc, audio, samples))
01015         return 0;
01016     samples = 1 << (venc->log2_blocksize[0] - 1);
01017 
01018     init_put_bits(&pb, packets, buf_size);
01019 
01020     put_bits(&pb, 1, 0); // magic bit
01021 
01022     put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
01023 
01024     mode    = &venc->modes[0];
01025     mapping = &venc->mappings[mode->mapping];
01026     if (mode->blockflag) {
01027         put_bits(&pb, 1, 0);
01028         put_bits(&pb, 1, 0);
01029     }
01030 
01031     for (i = 0; i < venc->channels; i++) {
01032         vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
01033         uint16_t posts[MAX_FLOOR_VALUES];
01034         floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
01035         floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples);
01036     }
01037 
01038     for (i = 0; i < venc->channels * samples; i++)
01039         venc->coeffs[i] /= venc->floor[i];
01040 
01041     for (i = 0; i < mapping->coupling_steps; i++) {
01042         float *mag = venc->coeffs + mapping->magnitude[i] * samples;
01043         float *ang = venc->coeffs + mapping->angle[i]     * samples;
01044         int j;
01045         for (j = 0; j < samples; j++) {
01046             float a = ang[j];
01047             ang[j] -= mag[j];
01048             if (mag[j] > 0)
01049                 ang[j] = -ang[j];
01050             if (ang[j] < 0)
01051                 mag[j] = a;
01052         }
01053     }
01054 
01055     residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],
01056                    &pb, venc->coeffs, samples, venc->channels);
01057 
01058     avccontext->coded_frame->pts = venc->sample_count;
01059     venc->sample_count += avccontext->frame_size;
01060     flush_put_bits(&pb);
01061     return put_bits_count(&pb) >> 3;
01062 }
01063 
01064 
01065 static av_cold int vorbis_encode_close(AVCodecContext *avccontext)
01066 {
01067     vorbis_enc_context *venc = avccontext->priv_data;
01068     int i;
01069 
01070     if (venc->codebooks)
01071         for (i = 0; i < venc->ncodebooks; i++) {
01072             av_freep(&venc->codebooks[i].lens);
01073             av_freep(&venc->codebooks[i].codewords);
01074             av_freep(&venc->codebooks[i].quantlist);
01075             av_freep(&venc->codebooks[i].dimentions);
01076             av_freep(&venc->codebooks[i].pow2);
01077         }
01078     av_freep(&venc->codebooks);
01079 
01080     if (venc->floors)
01081         for (i = 0; i < venc->nfloors; i++) {
01082             int j;
01083             if (venc->floors[i].classes)
01084                 for (j = 0; j < venc->floors[i].nclasses; j++)
01085                     av_freep(&venc->floors[i].classes[j].books);
01086             av_freep(&venc->floors[i].classes);
01087             av_freep(&venc->floors[i].partition_to_class);
01088             av_freep(&venc->floors[i].list);
01089         }
01090     av_freep(&venc->floors);
01091 
01092     if (venc->residues)
01093         for (i = 0; i < venc->nresidues; i++) {
01094             av_freep(&venc->residues[i].books);
01095             av_freep(&venc->residues[i].maxes);
01096         }
01097     av_freep(&venc->residues);
01098 
01099     if (venc->mappings)
01100         for (i = 0; i < venc->nmappings; i++) {
01101             av_freep(&venc->mappings[i].mux);
01102             av_freep(&venc->mappings[i].floor);
01103             av_freep(&venc->mappings[i].residue);
01104             av_freep(&venc->mappings[i].magnitude);
01105             av_freep(&venc->mappings[i].angle);
01106         }
01107     av_freep(&venc->mappings);
01108 
01109     av_freep(&venc->modes);
01110 
01111     av_freep(&venc->saved);
01112     av_freep(&venc->samples);
01113     av_freep(&venc->floor);
01114     av_freep(&venc->coeffs);
01115 
01116     ff_mdct_end(&venc->mdct[0]);
01117     ff_mdct_end(&venc->mdct[1]);
01118 
01119     av_freep(&avccontext->coded_frame);
01120     av_freep(&avccontext->extradata);
01121 
01122     return 0 ;
01123 }
01124 
01125 static av_cold int vorbis_encode_init(AVCodecContext *avccontext)
01126 {
01127     vorbis_enc_context *venc = avccontext->priv_data;
01128     int ret;
01129 
01130     if (avccontext->channels != 2) {
01131         av_log(avccontext, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");
01132         return -1;
01133     }
01134 
01135     if ((ret = create_vorbis_context(venc, avccontext)) < 0)
01136         goto error;
01137 
01138     if (avccontext->flags & CODEC_FLAG_QSCALE)
01139         venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
01140     else
01141         venc->quality = 0.03;
01142     venc->quality *= venc->quality;
01143 
01144     if ((ret = put_main_header(venc, (uint8_t**)&avccontext->extradata)) < 0)
01145         goto error;
01146     avccontext->extradata_size = ret;
01147 
01148     avccontext->frame_size = 1 << (venc->log2_blocksize[0] - 1);
01149 
01150     avccontext->coded_frame = avcodec_alloc_frame();
01151     if (!avccontext->coded_frame) {
01152         ret = AVERROR(ENOMEM);
01153         goto error;
01154     }
01155 
01156     return 0;
01157 error:
01158     vorbis_encode_close(avccontext);
01159     return ret;
01160 }
01161 
01162 AVCodec ff_vorbis_encoder = {
01163     .name           = "vorbis",
01164     .type           = AVMEDIA_TYPE_AUDIO,
01165     .id             = CODEC_ID_VORBIS,
01166     .priv_data_size = sizeof(vorbis_enc_context),
01167     .init           = vorbis_encode_init,
01168     .encode         = vorbis_encode_frame,
01169     .close          = vorbis_encode_close,
01170     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL,
01171     .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
01172     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
01173 };