FFmpeg: libavcodec/vorbis_enc.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 static inline void put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb,
00130                                 int entry)
00131 {
00132     assert(entry >= 0);
00133     assert(entry < cb->nentries);
00134     assert(cb->lens[entry]);
00135     put_bits(pb, cb->lens[entry], cb->codewords[entry]);
00136 }
00137 
00138 static int cb_lookup_vals(int lookup, int dimentions, int entries)
00139 {
00140     if (lookup == 1)
00141         return ff_vorbis_nth_root(entries, dimentions);
00142     else if (lookup == 2)
00143         return dimentions *entries;
00144     return 0;
00145 }
00146 
00147 static void ready_codebook(vorbis_enc_codebook *cb)
00148 {
00149     int i;
00150 
00151     ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
00152 
00153     if (!cb->lookup) {
00154         cb->pow2 = cb->dimentions = NULL;
00155     } else {
00156         int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
00157         cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions);
00158         cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
00159         for (i = 0; i < cb->nentries; i++) {
00160             float last = 0;
00161             int j;
00162             int div = 1;
00163             for (j = 0; j < cb->ndimentions; j++) {
00164                 int off;
00165                 if (cb->lookup == 1)
00166                     off = (i / div) % vals; // lookup type 1
00167                 else
00168                     off = i * cb->ndimentions + j; // lookup type 2
00169 
00170                 cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
00171                 if (cb->seq_p)
00172                     last = cb->dimentions[i * cb->ndimentions + j];
00173                 cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j] * cb->dimentions[i * cb->ndimentions + j];
00174                 div *= vals;
00175             }
00176             cb->pow2[i] /= 2.;
00177         }
00178     }
00179 }
00180 
00181 static void ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc)
00182 {
00183     int i;
00184     assert(rc->type == 2);
00185     rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
00186     for (i = 0; i < rc->classifications; i++) {
00187         int j;
00188         vorbis_enc_codebook * cb;
00189         for (j = 0; j < 8; j++)
00190             if (rc->books[i][j] != -1)
00191                 break;
00192         if (j == 8) // zero
00193             continue;
00194         cb = &venc->codebooks[rc->books[i][j]];
00195         assert(cb->ndimentions >= 2);
00196         assert(cb->lookup);
00197 
00198         for (j = 0; j < cb->nentries; j++) {
00199             float a;
00200             if (!cb->lens[j])
00201                 continue;
00202             a = fabs(cb->dimentions[j * cb->ndimentions]);
00203             if (a > rc->maxes[i][0])
00204                 rc->maxes[i][0] = a;
00205             a = fabs(cb->dimentions[j * cb->ndimentions + 1]);
00206             if (a > rc->maxes[i][1])
00207                 rc->maxes[i][1] = a;
00208         }
00209     }
00210     // small bias
00211     for (i = 0; i < rc->classifications; i++) {
00212         rc->maxes[i][0] += 0.8;
00213         rc->maxes[i][1] += 0.8;
00214     }
00215 }
00216 
00217 static void create_vorbis_context(vorbis_enc_context *venc,
00218                                   AVCodecContext *avccontext)
00219 {
00220     vorbis_enc_floor   *fc;
00221     vorbis_enc_residue *rc;
00222     vorbis_enc_mapping *mc;
00223     int i, book;
00224 
00225     venc->channels    = avccontext->channels;
00226     venc->sample_rate = avccontext->sample_rate;
00227     venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
00228 
00229     venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);
00230     venc->codebooks  = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
00231 
00232     // codebook 0..14 - floor1 book, values 0..255
00233     // codebook 15 residue masterbook
00234     // codebook 16..29 residue
00235     for (book = 0; book < venc->ncodebooks; book++) {
00236         vorbis_enc_codebook *cb = &venc->codebooks[book];
00237         int vals;
00238         cb->ndimentions = cvectors[book].dim;
00239         cb->nentries    = cvectors[book].real_len;
00240         cb->min         = cvectors[book].min;
00241         cb->delta       = cvectors[book].delta;
00242         cb->lookup      = cvectors[book].lookup;
00243         cb->seq_p       = 0;
00244 
00245         cb->lens      = av_malloc(sizeof(uint8_t)  * cb->nentries);
00246         cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
00247         memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
00248         memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
00249 
00250         if (cb->lookup) {
00251             vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
00252             cb->quantlist = av_malloc(sizeof(int) * vals);
00253             for (i = 0; i < vals; i++)
00254                 cb->quantlist[i] = cvectors[book].quant[i];
00255         } else {
00256             cb->quantlist = NULL;
00257         }
00258         ready_codebook(cb);
00259     }
00260 
00261     venc->nfloors = 1;
00262     venc->floors  = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);
00263 
00264     // just 1 floor
00265     fc = &venc->floors[0];
00266     fc->partitions         = 8;
00267     fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
00268     fc->nclasses           = 0;
00269     for (i = 0; i < fc->partitions; i++) {
00270         static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4};
00271         fc->partition_to_class[i] = a[i];
00272         fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
00273     }
00274     fc->nclasses++;
00275     fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses);
00276     for (i = 0; i < fc->nclasses; i++) {
00277         vorbis_enc_floor_class * c = &fc->classes[i];
00278         int j, books;
00279         c->dim        = floor_classes[i].dim;
00280         c->subclass   = floor_classes[i].subclass;
00281         c->masterbook = floor_classes[i].masterbook;
00282         books         = (1 << c->subclass);
00283         c->books      = av_malloc(sizeof(int) * books);
00284         for (j = 0; j < books; j++)
00285             c->books[j] = floor_classes[i].nbooks[j];
00286     }
00287     fc->multiplier = 2;
00288     fc->rangebits  = venc->log2_blocksize[0] - 1;
00289 
00290     fc->values = 2;
00291     for (i = 0; i < fc->partitions; i++)
00292         fc->values += fc->classes[fc->partition_to_class[i]].dim;
00293 
00294     fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);
00295     fc->list[0].x = 0;
00296     fc->list[1].x = 1 << fc->rangebits;
00297     for (i = 2; i < fc->values; i++) {
00298         static const int a[] = {
00299              93, 23,372,  6, 46,186,750, 14, 33, 65,
00300             130,260,556,  3, 10, 18, 28, 39, 55, 79,
00301             111,158,220,312,464,650,850
00302         };
00303         fc->list[i].x = a[i - 2];
00304     }
00305     if (ff_vorbis_ready_floor1_list(avccontext, fc->list, fc->values))
00306         return AVERROR(EINVAL);
00307 
00308     venc->nresidues = 1;
00309     venc->residues  = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
00310 
00311     // single residue
00312     rc = &venc->residues[0];
00313     rc->type            = 2;
00314     rc->begin           = 0;
00315     rc->end             = 1600;
00316     rc->partition_size  = 32;
00317     rc->classifications = 10;
00318     rc->classbook       = 15;
00319     rc->books           = av_malloc(sizeof(*rc->books) * rc->classifications);
00320     {
00321         static const int8_t a[10][8] = {
00322             { -1, -1, -1, -1, -1, -1, -1, -1, },
00323             { -1, -1, 16, -1, -1, -1, -1, -1, },
00324             { -1, -1, 17, -1, -1, -1, -1, -1, },
00325             { -1, -1, 18, -1, -1, -1, -1, -1, },
00326             { -1, -1, 19, -1, -1, -1, -1, -1, },
00327             { -1, -1, 20, -1, -1, -1, -1, -1, },
00328             { -1, -1, 21, -1, -1, -1, -1, -1, },
00329             { 22, 23, -1, -1, -1, -1, -1, -1, },
00330             { 24, 25, -1, -1, -1, -1, -1, -1, },
00331             { 26, 27, 28, -1, -1, -1, -1, -1, },
00332         };
00333         memcpy(rc->books, a, sizeof a);
00334     }
00335     ready_residue(rc, venc);
00336 
00337     venc->nmappings = 1;
00338     venc->mappings  = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
00339 
00340     // single mapping
00341     mc = &venc->mappings[0];
00342     mc->submaps = 1;
00343     mc->mux     = av_malloc(sizeof(int) * venc->channels);
00344     for (i = 0; i < venc->channels; i++)
00345         mc->mux[i] = 0;
00346     mc->floor   = av_malloc(sizeof(int) * mc->submaps);
00347     mc->residue = av_malloc(sizeof(int) * mc->submaps);
00348     for (i = 0; i < mc->submaps; i++) {
00349         mc->floor[i]   = 0;
00350         mc->residue[i] = 0;
00351     }
00352     mc->coupling_steps = venc->channels == 2 ? 1 : 0;
00353     mc->magnitude      = av_malloc(sizeof(int) * mc->coupling_steps);
00354     mc->angle          = av_malloc(sizeof(int) * mc->coupling_steps);
00355     if (mc->coupling_steps) {
00356         mc->magnitude[0] = 0;
00357         mc->angle[0]     = 1;
00358     }
00359 
00360     venc->nmodes = 1;
00361     venc->modes  = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
00362 
00363     // single mode
00364     venc->modes[0].blockflag = 0;
00365     venc->modes[0].mapping   = 0;
00366 
00367     venc->have_saved = 0;
00368     venc->saved      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
00369     venc->samples    = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
00370     venc->floor      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
00371     venc->coeffs     = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
00372 
00373     venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
00374     venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
00375 
00376     ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0);
00377     ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0);
00378 }
00379 
00380 static void put_float(PutBitContext *pb, float f)
00381 {
00382     int exp, mant;
00383     uint32_t res = 0;
00384     mant = (int)ldexp(frexp(f, &exp), 20);
00385     exp += 788 - 20;
00386     if (mant < 0) {
00387         res |= (1 << 31);
00388         mant = -mant;
00389     }
00390     res |= mant | (exp << 21);
00391     put_bits32(pb, res);
00392 }
00393 
00394 static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb)
00395 {
00396     int i;
00397     int ordered = 0;
00398 
00399     put_bits(pb, 24, 0x564342); //magic
00400     put_bits(pb, 16, cb->ndimentions);
00401     put_bits(pb, 24, cb->nentries);
00402 
00403     for (i = 1; i < cb->nentries; i++)
00404         if (cb->lens[i] < cb->lens[i-1])
00405             break;
00406     if (i == cb->nentries)
00407         ordered = 1;
00408 
00409     put_bits(pb, 1, ordered);
00410     if (ordered) {
00411         int len = cb->lens[0];
00412         put_bits(pb, 5, len - 1);
00413         i = 0;
00414         while (i < cb->nentries) {
00415             int j;
00416             for (j = 0; j+i < cb->nentries; j++)
00417                 if (cb->lens[j+i] != len)
00418                     break;
00419             put_bits(pb, ilog(cb->nentries - i), j);
00420             i += j;
00421             len++;
00422         }
00423     } else {
00424         int sparse = 0;
00425         for (i = 0; i < cb->nentries; i++)
00426             if (!cb->lens[i])
00427                 break;
00428         if (i != cb->nentries)
00429             sparse = 1;
00430         put_bits(pb, 1, sparse);
00431 
00432         for (i = 0; i < cb->nentries; i++) {
00433             if (sparse)
00434                 put_bits(pb, 1, !!cb->lens[i]);
00435             if (cb->lens[i])
00436                 put_bits(pb, 5, cb->lens[i] - 1);
00437         }
00438     }
00439 
00440     put_bits(pb, 4, cb->lookup);
00441     if (cb->lookup) {
00442         int tmp  = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
00443         int bits = ilog(cb->quantlist[0]);
00444 
00445         for (i = 1; i < tmp; i++)
00446             bits = FFMAX(bits, ilog(cb->quantlist[i]));
00447 
00448         put_float(pb, cb->min);
00449         put_float(pb, cb->delta);
00450 
00451         put_bits(pb, 4, bits - 1);
00452         put_bits(pb, 1, cb->seq_p);
00453 
00454         for (i = 0; i < tmp; i++)
00455             put_bits(pb, bits, cb->quantlist[i]);
00456     }
00457 }
00458 
00459 static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc)
00460 {
00461     int i;
00462 
00463     put_bits(pb, 16, 1); // type, only floor1 is supported
00464 
00465     put_bits(pb, 5, fc->partitions);
00466 
00467     for (i = 0; i < fc->partitions; i++)
00468         put_bits(pb, 4, fc->partition_to_class[i]);
00469 
00470     for (i = 0; i < fc->nclasses; i++) {
00471         int j, books;
00472 
00473         put_bits(pb, 3, fc->classes[i].dim - 1);
00474         put_bits(pb, 2, fc->classes[i].subclass);
00475 
00476         if (fc->classes[i].subclass)
00477             put_bits(pb, 8, fc->classes[i].masterbook);
00478 
00479         books = (1 << fc->classes[i].subclass);
00480 
00481         for (j = 0; j < books; j++)
00482             put_bits(pb, 8, fc->classes[i].books[j] + 1);
00483     }
00484 
00485     put_bits(pb, 2, fc->multiplier - 1);
00486     put_bits(pb, 4, fc->rangebits);
00487 
00488     for (i = 2; i < fc->values; i++)
00489         put_bits(pb, fc->rangebits, fc->list[i].x);
00490 }
00491 
00492 static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *rc)
00493 {
00494     int i;
00495 
00496     put_bits(pb, 16, rc->type);
00497 
00498     put_bits(pb, 24, rc->begin);
00499     put_bits(pb, 24, rc->end);
00500     put_bits(pb, 24, rc->partition_size - 1);
00501     put_bits(pb, 6, rc->classifications - 1);
00502     put_bits(pb, 8, rc->classbook);
00503 
00504     for (i = 0; i < rc->classifications; i++) {
00505         int j, tmp = 0;
00506         for (j = 0; j < 8; j++)
00507             tmp |= (rc->books[i][j] != -1) << j;
00508 
00509         put_bits(pb, 3, tmp & 7);
00510         put_bits(pb, 1, tmp > 7);
00511 
00512         if (tmp > 7)
00513             put_bits(pb, 5, tmp >> 3);
00514     }
00515 
00516     for (i = 0; i < rc->classifications; i++) {
00517         int j;
00518         for (j = 0; j < 8; j++)
00519             if (rc->books[i][j] != -1)
00520                 put_bits(pb, 8, rc->books[i][j]);
00521     }
00522 }
00523 
00524 static int put_main_header(vorbis_enc_context *venc, uint8_t **out)
00525 {
00526     int i;
00527     PutBitContext pb;
00528     uint8_t buffer[50000] = {0}, *p = buffer;
00529     int buffer_len = sizeof buffer;
00530     int len, hlens[3];
00531 
00532     // identification header
00533     init_put_bits(&pb, p, buffer_len);
00534     put_bits(&pb, 8, 1); //magic
00535     for (i = 0; "vorbis"[i]; i++)
00536         put_bits(&pb, 8, "vorbis"[i]);
00537     put_bits32(&pb, 0); // version
00538     put_bits(&pb,  8, venc->channels);
00539     put_bits32(&pb, venc->sample_rate);
00540     put_bits32(&pb, 0); // bitrate
00541     put_bits32(&pb, 0); // bitrate
00542     put_bits32(&pb, 0); // bitrate
00543     put_bits(&pb,  4, venc->log2_blocksize[0]);
00544     put_bits(&pb,  4, venc->log2_blocksize[1]);
00545     put_bits(&pb,  1, 1); // framing
00546 
00547     flush_put_bits(&pb);
00548     hlens[0] = put_bits_count(&pb) >> 3;
00549     buffer_len -= hlens[0];
00550     p += hlens[0];
00551 
00552     // comment header
00553     init_put_bits(&pb, p, buffer_len);
00554     put_bits(&pb, 8, 3); //magic
00555     for (i = 0; "vorbis"[i]; i++)
00556         put_bits(&pb, 8, "vorbis"[i]);
00557     put_bits32(&pb, 0); // vendor length TODO
00558     put_bits32(&pb, 0); // amount of comments
00559     put_bits(&pb,  1, 1); // framing
00560 
00561     flush_put_bits(&pb);
00562     hlens[1] = put_bits_count(&pb) >> 3;
00563     buffer_len -= hlens[1];
00564     p += hlens[1];
00565 
00566     // setup header
00567     init_put_bits(&pb, p, buffer_len);
00568     put_bits(&pb, 8, 5); //magic
00569     for (i = 0; "vorbis"[i]; i++)
00570         put_bits(&pb, 8, "vorbis"[i]);
00571 
00572     // codebooks
00573     put_bits(&pb, 8, venc->ncodebooks - 1);
00574     for (i = 0; i < venc->ncodebooks; i++)
00575         put_codebook_header(&pb, &venc->codebooks[i]);
00576 
00577     // time domain, reserved, zero
00578     put_bits(&pb,  6, 0);
00579     put_bits(&pb, 16, 0);
00580 
00581     // floors
00582     put_bits(&pb, 6, venc->nfloors - 1);
00583     for (i = 0; i < venc->nfloors; i++)
00584         put_floor_header(&pb, &venc->floors[i]);
00585 
00586     // residues
00587     put_bits(&pb, 6, venc->nresidues - 1);
00588     for (i = 0; i < venc->nresidues; i++)
00589         put_residue_header(&pb, &venc->residues[i]);
00590 
00591     // mappings
00592     put_bits(&pb, 6, venc->nmappings - 1);
00593     for (i = 0; i < venc->nmappings; i++) {
00594         vorbis_enc_mapping *mc = &venc->mappings[i];
00595         int j;
00596         put_bits(&pb, 16, 0); // mapping type
00597 
00598         put_bits(&pb, 1, mc->submaps > 1);
00599         if (mc->submaps > 1)
00600             put_bits(&pb, 4, mc->submaps - 1);
00601 
00602         put_bits(&pb, 1, !!mc->coupling_steps);
00603         if (mc->coupling_steps) {
00604             put_bits(&pb, 8, mc->coupling_steps - 1);
00605             for (j = 0; j < mc->coupling_steps; j++) {
00606                 put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
00607                 put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
00608             }
00609         }
00610 
00611         put_bits(&pb, 2, 0); // reserved
00612 
00613         if (mc->submaps > 1)
00614             for (j = 0; j < venc->channels; j++)
00615                 put_bits(&pb, 4, mc->mux[j]);
00616 
00617         for (j = 0; j < mc->submaps; j++) {
00618             put_bits(&pb, 8, 0); // reserved time configuration
00619             put_bits(&pb, 8, mc->floor[j]);
00620             put_bits(&pb, 8, mc->residue[j]);
00621         }
00622     }
00623 
00624     // modes
00625     put_bits(&pb, 6, venc->nmodes - 1);
00626     for (i = 0; i < venc->nmodes; i++) {
00627         put_bits(&pb, 1, venc->modes[i].blockflag);
00628         put_bits(&pb, 16, 0); // reserved window type
00629         put_bits(&pb, 16, 0); // reserved transform type
00630         put_bits(&pb, 8, venc->modes[i].mapping);
00631     }
00632 
00633     put_bits(&pb, 1, 1); // framing
00634 
00635     flush_put_bits(&pb);
00636     hlens[2] = put_bits_count(&pb) >> 3;
00637 
00638     len = hlens[0] + hlens[1] + hlens[2];
00639     p = *out = av_mallocz(64 + len + len/255);
00640 
00641     *p++ = 2;
00642     p += av_xiphlacing(p, hlens[0]);
00643     p += av_xiphlacing(p, hlens[1]);
00644     buffer_len = 0;
00645     for (i = 0; i < 3; i++) {
00646         memcpy(p, buffer + buffer_len, hlens[i]);
00647         p += hlens[i];
00648         buffer_len += hlens[i];
00649     }
00650 
00651     return p - *out;
00652 }
00653 
00654 static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i)
00655 {
00656     int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
00657     int end   = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
00658     int j;
00659     float average = 0;
00660 
00661     for (j = begin; j < end; j++)
00662         average += fabs(coeffs[j]);
00663     return average / (end - begin);
00664 }
00665 
00666 static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc,
00667                       float *coeffs, uint_fast16_t *posts, int samples)
00668 {
00669     int range = 255 / fc->multiplier + 1;
00670     int i;
00671     float tot_average = 0.;
00672     float averages[fc->values];
00673     for (i = 0; i < fc->values; i++) {
00674         averages[i] = get_floor_average(fc, coeffs, i);
00675         tot_average += averages[i];
00676     }
00677     tot_average /= fc->values;
00678     tot_average /= venc->quality;
00679 
00680     for (i = 0; i < fc->values; i++) {
00681         int position  = fc->list[fc->list[i].sort].x;
00682         float average = averages[i];
00683         int j;
00684 
00685         average *= pow(tot_average / average, 0.5) * pow(1.25, position/200.); // MAGIC!
00686         for (j = 0; j < range - 1; j++)
00687             if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average)
00688                 break;
00689         posts[fc->list[i].sort] = j;
00690     }
00691 }
00692 
00693 static int render_point(int x0, int y0, int x1, int y1, int x)
00694 {
00695     return y0 +  (x - x0) * (y1 - y0) / (x1 - x0);
00696 }
00697 
00698 static void floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,
00699                          PutBitContext *pb, uint_fast16_t *posts,
00700                          float *floor, int samples)
00701 {
00702     int range = 255 / fc->multiplier + 1;
00703     int coded[fc->values]; // first 2 values are unused
00704     int i, counter;
00705 
00706     put_bits(pb, 1, 1); // non zero
00707     put_bits(pb, ilog(range - 1), posts[0]);
00708     put_bits(pb, ilog(range - 1), posts[1]);
00709     coded[0] = coded[1] = 1;
00710 
00711     for (i = 2; i < fc->values; i++) {
00712         int predicted = render_point(fc->list[fc->list[i].low].x,
00713                                      posts[fc->list[i].low],
00714                                      fc->list[fc->list[i].high].x,
00715                                      posts[fc->list[i].high],
00716                                      fc->list[i].x);
00717         int highroom = range - predicted;
00718         int lowroom = predicted;
00719         int room = FFMIN(highroom, lowroom);
00720         if (predicted == posts[i]) {
00721             coded[i] = 0; // must be used later as flag!
00722             continue;
00723         } else {
00724             if (!coded[fc->list[i].low ])
00725                 coded[fc->list[i].low ] = -1;
00726             if (!coded[fc->list[i].high])
00727                 coded[fc->list[i].high] = -1;
00728         }
00729         if (posts[i] > predicted) {
00730             if (posts[i] - predicted > room)
00731                 coded[i] = posts[i] - predicted + lowroom;
00732             else
00733                 coded[i] = (posts[i] - predicted) << 1;
00734         } else {
00735             if (predicted - posts[i] > room)
00736                 coded[i] = predicted - posts[i] + highroom - 1;
00737             else
00738                 coded[i] = ((predicted - posts[i]) << 1) - 1;
00739         }
00740     }
00741 
00742     counter = 2;
00743     for (i = 0; i < fc->partitions; i++) {
00744         vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
00745         int k, cval = 0, csub = 1<<c->subclass;
00746         if (c->subclass) {
00747             vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
00748             int cshift = 0;
00749             for (k = 0; k < c->dim; k++) {
00750                 int l;
00751                 for (l = 0; l < csub; l++) {
00752                     int maxval = 1;
00753                     if (c->books[l] != -1)
00754                         maxval = venc->codebooks[c->books[l]].nentries;
00755                     // coded could be -1, but this still works, cause that is 0
00756                     if (coded[counter + k] < maxval)
00757                         break;
00758                 }
00759                 assert(l != csub);
00760                 cval   |= l << cshift;
00761                 cshift += c->subclass;
00762             }
00763             put_codeword(pb, book, cval);
00764         }
00765         for (k = 0; k < c->dim; k++) {
00766             int book  = c->books[cval & (csub-1)];
00767             int entry = coded[counter++];
00768             cval >>= c->subclass;
00769             if (book == -1)
00770                 continue;
00771             if (entry == -1)
00772                 entry = 0;
00773             put_codeword(pb, &venc->codebooks[book], entry);
00774         }
00775     }
00776 
00777     ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded,
00778                                  fc->multiplier, floor, samples);
00779 }
00780 
00781 static float *put_vector(vorbis_enc_codebook *book, PutBitContext *pb,
00782                          float *num)
00783 {
00784     int i, entry = -1;
00785     float distance = FLT_MAX;
00786     assert(book->dimentions);
00787     for (i = 0; i < book->nentries; i++) {
00788         float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i];
00789         int j;
00790         if (!book->lens[i])
00791             continue;
00792         for (j = 0; j < book->ndimentions; j++)
00793             d -= vec[j] * num[j];
00794         if (distance > d) {
00795             entry    = i;
00796             distance = d;
00797         }
00798     }
00799     put_codeword(pb, book, entry);
00800     return &book->dimentions[entry * book->ndimentions];
00801 }
00802 
00803 static void residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,
00804                            PutBitContext *pb, float *coeffs, int samples,
00805                            int real_ch)
00806 {
00807     int pass, i, j, p, k;
00808     int psize      = rc->partition_size;
00809     int partitions = (rc->end - rc->begin) / psize;
00810     int channels   = (rc->type == 2) ? 1 : real_ch;
00811     int classes[channels][partitions];
00812     int classwords = venc->codebooks[rc->classbook].ndimentions;
00813 
00814     assert(rc->type == 2);
00815     assert(real_ch == 2);
00816     for (p = 0; p < partitions; p++) {
00817         float max1 = 0., max2 = 0.;
00818         int s = rc->begin + p * psize;
00819         for (k = s; k < s + psize; k += 2) {
00820             max1 = FFMAX(max1, fabs(coeffs[          k / real_ch]));
00821             max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
00822         }
00823 
00824         for (i = 0; i < rc->classifications - 1; i++)
00825             if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1])
00826                 break;
00827         classes[0][p] = i;
00828     }
00829 
00830     for (pass = 0; pass < 8; pass++) {
00831         p = 0;
00832         while (p < partitions) {
00833             if (pass == 0)
00834                 for (j = 0; j < channels; j++) {
00835                     vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
00836                     int entry = 0;
00837                     for (i = 0; i < classwords; i++) {
00838                         entry *= rc->classifications;
00839                         entry += classes[j][p + i];
00840                     }
00841                     put_codeword(pb, book, entry);
00842                 }
00843             for (i = 0; i < classwords && p < partitions; i++, p++) {
00844                 for (j = 0; j < channels; j++) {
00845                     int nbook = rc->books[classes[j][p]][pass];
00846                     vorbis_enc_codebook * book = &venc->codebooks[nbook];
00847                     float *buf = coeffs + samples*j + rc->begin + p*psize;
00848                     if (nbook == -1)
00849                         continue;
00850 
00851                     assert(rc->type == 0 || rc->type == 2);
00852                     assert(!(psize % book->ndimentions));
00853 
00854                     if (rc->type == 0) {
00855                         for (k = 0; k < psize; k += book->ndimentions) {
00856                             float *a = put_vector(book, pb, &buf[k]);
00857                             int l;
00858                             for (l = 0; l < book->ndimentions; l++)
00859                                 buf[k + l] -= a[l];
00860                         }
00861                     } else {
00862                         int s = rc->begin + p * psize, a1, b1;
00863                         a1 = (s % real_ch) * samples;
00864                         b1 =  s / real_ch;
00865                         s  = real_ch * samples;
00866                         for (k = 0; k < psize; k += book->ndimentions) {
00867                             int dim, a2 = a1, b2 = b1;
00868                             float vec[book->ndimentions], *pv = vec;
00869                             for (dim = book->ndimentions; dim--; ) {
00870                                 *pv++ = coeffs[a2 + b2];
00871                                 if ((a2 += samples) == s) {
00872                                     a2 = 0;
00873                                     b2++;
00874                                 }
00875                             }
00876                             pv = put_vector(book, pb, vec);
00877                             for (dim = book->ndimentions; dim--; ) {
00878                                 coeffs[a1 + b1] -= *pv++;
00879                                 if ((a1 += samples) == s) {
00880                                     a1 = 0;
00881                                     b1++;
00882                                 }
00883                             }
00884                         }
00885                     }
00886                 }
00887             }
00888         }
00889     }
00890 }
00891 
00892 static int apply_window_and_mdct(vorbis_enc_context *venc, signed short *audio,
00893                                  int samples)
00894 {
00895     int i, j, channel;
00896     const float * win = venc->win[0];
00897     int window_len = 1 << (venc->log2_blocksize[0] - 1);
00898     float n = (float)(1 << venc->log2_blocksize[0]) / 4.;
00899     // FIXME use dsp
00900 
00901     if (!venc->have_saved && !samples)
00902         return 0;
00903 
00904     if (venc->have_saved) {
00905         for (channel = 0; channel < venc->channels; channel++)
00906             memcpy(venc->samples + channel * window_len * 2,
00907                    venc->saved + channel * window_len, sizeof(float) * window_len);
00908     } else {
00909         for (channel = 0; channel < venc->channels; channel++)
00910             memset(venc->samples + channel * window_len * 2, 0,
00911                    sizeof(float) * window_len);
00912     }
00913 
00914     if (samples) {
00915         for (channel = 0; channel < venc->channels; channel++) {
00916             float * offset = venc->samples + channel*window_len*2 + window_len;
00917             j = channel;
00918             for (i = 0; i < samples; i++, j += venc->channels)
00919                 offset[i] = -audio[j] / 32768. / n * win[window_len - i - 1]; //FIXME find out why the sign has to be fliped
00920         }
00921     } else {
00922         for (channel = 0; channel < venc->channels; channel++)
00923             memset(venc->samples + channel * window_len * 2 + window_len,
00924                    0, sizeof(float) * window_len);
00925     }
00926 
00927     for (channel = 0; channel < venc->channels; channel++)
00928         ff_mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,
00929                      venc->samples + channel * window_len * 2);
00930 
00931     if (samples) {
00932         for (channel = 0; channel < venc->channels; channel++) {
00933             float *offset = venc->saved + channel * window_len;
00934             j = channel;
00935             for (i = 0; i < samples; i++, j += venc->channels)
00936                 offset[i] = -audio[j] / 32768. / n * win[i]; //FIXME find out why the sign has to be fliped
00937         }
00938         venc->have_saved = 1;
00939     } else {
00940         venc->have_saved = 0;
00941     }
00942     return 1;
00943 }
00944 
00945 static av_cold int vorbis_encode_init(AVCodecContext *avccontext)
00946 {
00947     vorbis_enc_context *venc = avccontext->priv_data;
00948 
00949     if (avccontext->channels != 2) {
00950         av_log(avccontext, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");
00951         return -1;
00952     }
00953 
00954     create_vorbis_context(venc, avccontext);
00955 
00956     if (avccontext->flags & CODEC_FLAG_QSCALE)
00957         venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
00958     else
00959         venc->quality = 1.;
00960     venc->quality *= venc->quality;
00961 
00962     avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata);
00963 
00964     avccontext->frame_size     = 1 << (venc->log2_blocksize[0] - 1);
00965 
00966     avccontext->coded_frame            = avcodec_alloc_frame();
00967     avccontext->coded_frame->key_frame = 1;
00968 
00969     return 0;
00970 }
00971 
00972 static int vorbis_encode_frame(AVCodecContext *avccontext,
00973                                unsigned char *packets,
00974                                int buf_size, void *data)
00975 {
00976     vorbis_enc_context *venc = avccontext->priv_data;
00977     signed short *audio = data;
00978     int samples = data ? avccontext->frame_size : 0;
00979     vorbis_enc_mode *mode;
00980     vorbis_enc_mapping *mapping;
00981     PutBitContext pb;
00982     int i;
00983 
00984     if (!apply_window_and_mdct(venc, audio, samples))
00985         return 0;
00986     samples = 1 << (venc->log2_blocksize[0] - 1);
00987 
00988     init_put_bits(&pb, packets, buf_size);
00989 
00990     put_bits(&pb, 1, 0); // magic bit
00991 
00992     put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
00993 
00994     mode    = &venc->modes[0];
00995     mapping = &venc->mappings[mode->mapping];
00996     if (mode->blockflag) {
00997         put_bits(&pb, 1, 0);
00998         put_bits(&pb, 1, 0);
00999     }
01000 
01001     for (i = 0; i < venc->channels; i++) {
01002         vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
01003         uint_fast16_t posts[fc->values];
01004         floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
01005         floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples);
01006     }
01007 
01008     for (i = 0; i < venc->channels * samples; i++)
01009         venc->coeffs[i] /= venc->floor[i];
01010 
01011     for (i = 0; i < mapping->coupling_steps; i++) {
01012         float *mag = venc->coeffs + mapping->magnitude[i] * samples;
01013         float *ang = venc->coeffs + mapping->angle[i]     * samples;
01014         int j;
01015         for (j = 0; j < samples; j++) {
01016             float a = ang[j];
01017             ang[j] -= mag[j];
01018             if (mag[j] > 0)
01019                 ang[j] = -ang[j];
01020             if (ang[j] < 0)
01021                 mag[j] = a;
01022         }
01023     }
01024 
01025     residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],
01026                    &pb, venc->coeffs, samples, venc->channels);
01027 
01028     avccontext->coded_frame->pts = venc->sample_count;
01029     venc->sample_count += avccontext->frame_size;
01030     flush_put_bits(&pb);
01031     return put_bits_count(&pb) >> 3;
01032 }
01033 
01034 
01035 static av_cold int vorbis_encode_close(AVCodecContext *avccontext)
01036 {
01037     vorbis_enc_context *venc = avccontext->priv_data;
01038     int i;
01039 
01040     if (venc->codebooks)
01041         for (i = 0; i < venc->ncodebooks; i++) {
01042             av_freep(&venc->codebooks[i].lens);
01043             av_freep(&venc->codebooks[i].codewords);
01044             av_freep(&venc->codebooks[i].quantlist);
01045             av_freep(&venc->codebooks[i].dimentions);
01046             av_freep(&venc->codebooks[i].pow2);
01047         }
01048     av_freep(&venc->codebooks);
01049 
01050     if (venc->floors)
01051         for (i = 0; i < venc->nfloors; i++) {
01052             int j;
01053             if (venc->floors[i].classes)
01054                 for (j = 0; j < venc->floors[i].nclasses; j++)
01055                     av_freep(&venc->floors[i].classes[j].books);
01056             av_freep(&venc->floors[i].classes);
01057             av_freep(&venc->floors[i].partition_to_class);
01058             av_freep(&venc->floors[i].list);
01059         }
01060     av_freep(&venc->floors);
01061 
01062     if (venc->residues)
01063         for (i = 0; i < venc->nresidues; i++) {
01064             av_freep(&venc->residues[i].books);
01065             av_freep(&venc->residues[i].maxes);
01066         }
01067     av_freep(&venc->residues);
01068 
01069     if (venc->mappings)
01070         for (i = 0; i < venc->nmappings; i++) {
01071             av_freep(&venc->mappings[i].mux);
01072             av_freep(&venc->mappings[i].floor);
01073             av_freep(&venc->mappings[i].residue);
01074             av_freep(&venc->mappings[i].magnitude);
01075             av_freep(&venc->mappings[i].angle);
01076         }
01077     av_freep(&venc->mappings);
01078 
01079     av_freep(&venc->modes);
01080 
01081     av_freep(&venc->saved);
01082     av_freep(&venc->samples);
01083     av_freep(&venc->floor);
01084     av_freep(&venc->coeffs);
01085 
01086     ff_mdct_end(&venc->mdct[0]);
01087     ff_mdct_end(&venc->mdct[1]);
01088 
01089     av_freep(&avccontext->coded_frame);
01090     av_freep(&avccontext->extradata);
01091 
01092     return 0 ;
01093 }
01094 
01095 AVCodec vorbis_encoder = {
01096     "vorbis",
01097     AVMEDIA_TYPE_AUDIO,
01098     CODEC_ID_VORBIS,
01099     sizeof(vorbis_enc_context),
01100     vorbis_encode_init,
01101     vorbis_encode_frame,
01102     vorbis_encode_close,
01103     .capabilities= CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL,
01104     .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
01105     .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
01106 };