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 "internal.h"
00031 #include "fft.h"
00032 #include "vorbis.h"
00033 #include "vorbis_enc_data.h"
00034 
00035 #define BITSTREAM_WRITER_LE
00036 #include "put_bits.h"
00037 
00038 #undef NDEBUG
00039 #include <assert.h>
00040 
00041 typedef struct {
00042     int nentries;
00043     uint8_t *lens;
00044     uint32_t *codewords;
00045     int ndimensions;
00046     float min;
00047     float delta;
00048     int seq_p;
00049     int lookup;
00050     int *quantlist;
00051     float *dimensions;
00052     float *pow2;
00053 } vorbis_enc_codebook;
00054 
00055 typedef struct {
00056     int dim;
00057     int subclass;
00058     int masterbook;
00059     int *books;
00060 } vorbis_enc_floor_class;
00061 
00062 typedef struct {
00063     int partitions;
00064     int *partition_to_class;
00065     int nclasses;
00066     vorbis_enc_floor_class *classes;
00067     int multiplier;
00068     int rangebits;
00069     int values;
00070     vorbis_floor1_entry *list;
00071 } vorbis_enc_floor;
00072 
00073 typedef struct {
00074     int type;
00075     int begin;
00076     int end;
00077     int partition_size;
00078     int classifications;
00079     int classbook;
00080     int8_t (*books)[8];
00081     float (*maxes)[2];
00082 } vorbis_enc_residue;
00083 
00084 typedef struct {
00085     int submaps;
00086     int *mux;
00087     int *floor;
00088     int *residue;
00089     int coupling_steps;
00090     int *magnitude;
00091     int *angle;
00092 } vorbis_enc_mapping;
00093 
00094 typedef struct {
00095     int blockflag;
00096     int mapping;
00097 } vorbis_enc_mode;
00098 
00099 typedef struct {
00100     int channels;
00101     int sample_rate;
00102     int log2_blocksize[2];
00103     FFTContext mdct[2];
00104     const float *win[2];
00105     int have_saved;
00106     float *saved;
00107     float *samples;
00108     float *floor;  // also used for tmp values for mdct
00109     float *coeffs; // also used for residue after floor
00110     float quality;
00111 
00112     int ncodebooks;
00113     vorbis_enc_codebook *codebooks;
00114 
00115     int nfloors;
00116     vorbis_enc_floor *floors;
00117 
00118     int nresidues;
00119     vorbis_enc_residue *residues;
00120 
00121     int nmappings;
00122     vorbis_enc_mapping *mappings;
00123 
00124     int nmodes;
00125     vorbis_enc_mode *modes;
00126 
00127     int64_t next_pts;
00128 } vorbis_enc_context;
00129 
00130 #define MAX_CHANNELS     2
00131 #define MAX_CODEBOOK_DIM 8
00132 
00133 #define MAX_FLOOR_CLASS_DIM  4
00134 #define NUM_FLOOR_PARTITIONS 8
00135 #define MAX_FLOOR_VALUES     (MAX_FLOOR_CLASS_DIM*NUM_FLOOR_PARTITIONS+2)
00136 
00137 #define RESIDUE_SIZE           1600
00138 #define RESIDUE_PART_SIZE      32
00139 #define NUM_RESIDUE_PARTITIONS (RESIDUE_SIZE/RESIDUE_PART_SIZE)
00140 
00141 static inline int put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb,
00142                                int entry)
00143 {
00144     assert(entry >= 0);
00145     assert(entry < cb->nentries);
00146     assert(cb->lens[entry]);
00147     if (pb->size_in_bits - put_bits_count(pb) < cb->lens[entry])
00148         return AVERROR(EINVAL);
00149     put_bits(pb, cb->lens[entry], cb->codewords[entry]);
00150     return 0;
00151 }
00152 
00153 static int cb_lookup_vals(int lookup, int dimensions, int entries)
00154 {
00155     if (lookup == 1)
00156         return ff_vorbis_nth_root(entries, dimensions);
00157     else if (lookup == 2)
00158         return dimensions *entries;
00159     return 0;
00160 }
00161 
00162 static int ready_codebook(vorbis_enc_codebook *cb)
00163 {
00164     int i;
00165 
00166     ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
00167 
00168     if (!cb->lookup) {
00169         cb->pow2 = cb->dimensions = NULL;
00170     } else {
00171         int vals = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
00172         cb->dimensions = av_malloc(sizeof(float) * cb->nentries * cb->ndimensions);
00173         cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
00174         if (!cb->dimensions || !cb->pow2)
00175             return AVERROR(ENOMEM);
00176         for (i = 0; i < cb->nentries; i++) {
00177             float last = 0;
00178             int j;
00179             int div = 1;
00180             for (j = 0; j < cb->ndimensions; j++) {
00181                 int off;
00182                 if (cb->lookup == 1)
00183                     off = (i / div) % vals; // lookup type 1
00184                 else
00185                     off = i * cb->ndimensions + j; // lookup type 2
00186 
00187                 cb->dimensions[i * cb->ndimensions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
00188                 if (cb->seq_p)
00189                     last = cb->dimensions[i * cb->ndimensions + j];
00190                 cb->pow2[i] += cb->dimensions[i * cb->ndimensions + j] * cb->dimensions[i * cb->ndimensions + j];
00191                 div *= vals;
00192             }
00193             cb->pow2[i] /= 2.;
00194         }
00195     }
00196     return 0;
00197 }
00198 
00199 static int ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc)
00200 {
00201     int i;
00202     assert(rc->type == 2);
00203     rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
00204     if (!rc->maxes)
00205         return AVERROR(ENOMEM);
00206     for (i = 0; i < rc->classifications; i++) {
00207         int j;
00208         vorbis_enc_codebook * cb;
00209         for (j = 0; j < 8; j++)
00210             if (rc->books[i][j] != -1)
00211                 break;
00212         if (j == 8) // zero
00213             continue;
00214         cb = &venc->codebooks[rc->books[i][j]];
00215         assert(cb->ndimensions >= 2);
00216         assert(cb->lookup);
00217 
00218         for (j = 0; j < cb->nentries; j++) {
00219             float a;
00220             if (!cb->lens[j])
00221                 continue;
00222             a = fabs(cb->dimensions[j * cb->ndimensions]);
00223             if (a > rc->maxes[i][0])
00224                 rc->maxes[i][0] = a;
00225             a = fabs(cb->dimensions[j * cb->ndimensions + 1]);
00226             if (a > rc->maxes[i][1])
00227                 rc->maxes[i][1] = a;
00228         }
00229     }
00230     // small bias
00231     for (i = 0; i < rc->classifications; i++) {
00232         rc->maxes[i][0] += 0.8;
00233         rc->maxes[i][1] += 0.8;
00234     }
00235     return 0;
00236 }
00237 
00238 static int create_vorbis_context(vorbis_enc_context *venc,
00239                                  AVCodecContext *avccontext)
00240 {
00241     vorbis_enc_floor   *fc;
00242     vorbis_enc_residue *rc;
00243     vorbis_enc_mapping *mc;
00244     int i, book, ret;
00245 
00246     venc->channels    = avccontext->channels;
00247     venc->sample_rate = avccontext->sample_rate;
00248     venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
00249 
00250     venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);
00251     venc->codebooks  = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
00252     if (!venc->codebooks)
00253         return AVERROR(ENOMEM);
00254 
00255     // codebook 0..14 - floor1 book, values 0..255
00256     // codebook 15 residue masterbook
00257     // codebook 16..29 residue
00258     for (book = 0; book < venc->ncodebooks; book++) {
00259         vorbis_enc_codebook *cb = &venc->codebooks[book];
00260         int vals;
00261         cb->ndimensions = cvectors[book].dim;
00262         cb->nentries    = cvectors[book].real_len;
00263         cb->min         = cvectors[book].min;
00264         cb->delta       = cvectors[book].delta;
00265         cb->lookup      = cvectors[book].lookup;
00266         cb->seq_p       = 0;
00267 
00268         cb->lens      = av_malloc(sizeof(uint8_t)  * cb->nentries);
00269         cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
00270         if (!cb->lens || !cb->codewords)
00271             return AVERROR(ENOMEM);
00272         memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
00273         memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
00274 
00275         if (cb->lookup) {
00276             vals = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
00277             cb->quantlist = av_malloc(sizeof(int) * vals);
00278             if (!cb->quantlist)
00279                 return AVERROR(ENOMEM);
00280             for (i = 0; i < vals; i++)
00281                 cb->quantlist[i] = cvectors[book].quant[i];
00282         } else {
00283             cb->quantlist = NULL;
00284         }
00285         if ((ret = ready_codebook(cb)) < 0)
00286             return ret;
00287     }
00288 
00289     venc->nfloors = 1;
00290     venc->floors  = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);
00291     if (!venc->floors)
00292         return AVERROR(ENOMEM);
00293 
00294     // just 1 floor
00295     fc = &venc->floors[0];
00296     fc->partitions         = NUM_FLOOR_PARTITIONS;
00297     fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
00298     if (!fc->partition_to_class)
00299         return AVERROR(ENOMEM);
00300     fc->nclasses           = 0;
00301     for (i = 0; i < fc->partitions; i++) {
00302         static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4};
00303         fc->partition_to_class[i] = a[i];
00304         fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
00305     }
00306     fc->nclasses++;
00307     fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses);
00308     if (!fc->classes)
00309         return AVERROR(ENOMEM);
00310     for (i = 0; i < fc->nclasses; i++) {
00311         vorbis_enc_floor_class * c = &fc->classes[i];
00312         int j, books;
00313         c->dim        = floor_classes[i].dim;
00314         c->subclass   = floor_classes[i].subclass;
00315         c->masterbook = floor_classes[i].masterbook;
00316         books         = (1 << c->subclass);
00317         c->books      = av_malloc(sizeof(int) * books);
00318         if (!c->books)
00319             return AVERROR(ENOMEM);
00320         for (j = 0; j < books; j++)
00321             c->books[j] = floor_classes[i].nbooks[j];
00322     }
00323     fc->multiplier = 2;
00324     fc->rangebits  = venc->log2_blocksize[0] - 1;
00325 
00326     fc->values = 2;
00327     for (i = 0; i < fc->partitions; i++)
00328         fc->values += fc->classes[fc->partition_to_class[i]].dim;
00329 
00330     fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);
00331     if (!fc->list)
00332         return AVERROR(ENOMEM);
00333     fc->list[0].x = 0;
00334     fc->list[1].x = 1 << fc->rangebits;
00335     for (i = 2; i < fc->values; i++) {
00336         static const int a[] = {
00337              93, 23,372,  6, 46,186,750, 14, 33, 65,
00338             130,260,556,  3, 10, 18, 28, 39, 55, 79,
00339             111,158,220,312,464,650,850
00340         };
00341         fc->list[i].x = a[i - 2];
00342     }
00343     ff_vorbis_ready_floor1_list(fc->list, fc->values);
00344 
00345     venc->nresidues = 1;
00346     venc->residues  = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
00347     if (!venc->residues)
00348         return AVERROR(ENOMEM);
00349 
00350     // single residue
00351     rc = &venc->residues[0];
00352     rc->type            = 2;
00353     rc->begin           = 0;
00354     rc->end             = 1600;
00355     rc->partition_size  = 32;
00356     rc->classifications = 10;
00357     rc->classbook       = 15;
00358     rc->books           = av_malloc(sizeof(*rc->books) * rc->classifications);
00359     if (!rc->books)
00360         return AVERROR(ENOMEM);
00361     {
00362         static const int8_t a[10][8] = {
00363             { -1, -1, -1, -1, -1, -1, -1, -1, },
00364             { -1, -1, 16, -1, -1, -1, -1, -1, },
00365             { -1, -1, 17, -1, -1, -1, -1, -1, },
00366             { -1, -1, 18, -1, -1, -1, -1, -1, },
00367             { -1, -1, 19, -1, -1, -1, -1, -1, },
00368             { -1, -1, 20, -1, -1, -1, -1, -1, },
00369             { -1, -1, 21, -1, -1, -1, -1, -1, },
00370             { 22, 23, -1, -1, -1, -1, -1, -1, },
00371             { 24, 25, -1, -1, -1, -1, -1, -1, },
00372             { 26, 27, 28, -1, -1, -1, -1, -1, },
00373         };
00374         memcpy(rc->books, a, sizeof a);
00375     }
00376     if ((ret = ready_residue(rc, venc)) < 0)
00377         return ret;
00378 
00379     venc->nmappings = 1;
00380     venc->mappings  = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
00381     if (!venc->mappings)
00382         return AVERROR(ENOMEM);
00383 
00384     // single mapping
00385     mc = &venc->mappings[0];
00386     mc->submaps = 1;
00387     mc->mux     = av_malloc(sizeof(int) * venc->channels);
00388     if (!mc->mux)
00389         return AVERROR(ENOMEM);
00390     for (i = 0; i < venc->channels; i++)
00391         mc->mux[i] = 0;
00392     mc->floor   = av_malloc(sizeof(int) * mc->submaps);
00393     mc->residue = av_malloc(sizeof(int) * mc->submaps);
00394     if (!mc->floor || !mc->residue)
00395         return AVERROR(ENOMEM);
00396     for (i = 0; i < mc->submaps; i++) {
00397         mc->floor[i]   = 0;
00398         mc->residue[i] = 0;
00399     }
00400     mc->coupling_steps = venc->channels == 2 ? 1 : 0;
00401     mc->magnitude      = av_malloc(sizeof(int) * mc->coupling_steps);
00402     mc->angle          = av_malloc(sizeof(int) * mc->coupling_steps);
00403     if (!mc->magnitude || !mc->angle)
00404         return AVERROR(ENOMEM);
00405     if (mc->coupling_steps) {
00406         mc->magnitude[0] = 0;
00407         mc->angle[0]     = 1;
00408     }
00409 
00410     venc->nmodes = 1;
00411     venc->modes  = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
00412     if (!venc->modes)
00413         return AVERROR(ENOMEM);
00414 
00415     // single mode
00416     venc->modes[0].blockflag = 0;
00417     venc->modes[0].mapping   = 0;
00418 
00419     venc->have_saved = 0;
00420     venc->saved      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
00421     venc->samples    = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
00422     venc->floor      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
00423     venc->coeffs     = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
00424     if (!venc->saved || !venc->samples || !venc->floor || !venc->coeffs)
00425         return AVERROR(ENOMEM);
00426 
00427     venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
00428     venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
00429 
00430     if ((ret = ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0)) < 0)
00431         return ret;
00432     if ((ret = ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0)) < 0)
00433         return ret;
00434 
00435     return 0;
00436 }
00437 
00438 static void put_float(PutBitContext *pb, float f)
00439 {
00440     int exp, mant;
00441     uint32_t res = 0;
00442     mant = (int)ldexp(frexp(f, &exp), 20);
00443     exp += 788 - 20;
00444     if (mant < 0) {
00445         res |= (1U << 31);
00446         mant = -mant;
00447     }
00448     res |= mant | (exp << 21);
00449     put_bits32(pb, res);
00450 }
00451 
00452 static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb)
00453 {
00454     int i;
00455     int ordered = 0;
00456 
00457     put_bits(pb, 24, 0x564342); //magic
00458     put_bits(pb, 16, cb->ndimensions);
00459     put_bits(pb, 24, cb->nentries);
00460 
00461     for (i = 1; i < cb->nentries; i++)
00462         if (cb->lens[i] < cb->lens[i-1])
00463             break;
00464     if (i == cb->nentries)
00465         ordered = 1;
00466 
00467     put_bits(pb, 1, ordered);
00468     if (ordered) {
00469         int len = cb->lens[0];
00470         put_bits(pb, 5, len - 1);
00471         i = 0;
00472         while (i < cb->nentries) {
00473             int j;
00474             for (j = 0; j+i < cb->nentries; j++)
00475                 if (cb->lens[j+i] != len)
00476                     break;
00477             put_bits(pb, ilog(cb->nentries - i), j);
00478             i += j;
00479             len++;
00480         }
00481     } else {
00482         int sparse = 0;
00483         for (i = 0; i < cb->nentries; i++)
00484             if (!cb->lens[i])
00485                 break;
00486         if (i != cb->nentries)
00487             sparse = 1;
00488         put_bits(pb, 1, sparse);
00489 
00490         for (i = 0; i < cb->nentries; i++) {
00491             if (sparse)
00492                 put_bits(pb, 1, !!cb->lens[i]);
00493             if (cb->lens[i])
00494                 put_bits(pb, 5, cb->lens[i] - 1);
00495         }
00496     }
00497 
00498     put_bits(pb, 4, cb->lookup);
00499     if (cb->lookup) {
00500         int tmp  = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
00501         int bits = ilog(cb->quantlist[0]);
00502 
00503         for (i = 1; i < tmp; i++)
00504             bits = FFMAX(bits, ilog(cb->quantlist[i]));
00505 
00506         put_float(pb, cb->min);
00507         put_float(pb, cb->delta);
00508 
00509         put_bits(pb, 4, bits - 1);
00510         put_bits(pb, 1, cb->seq_p);
00511 
00512         for (i = 0; i < tmp; i++)
00513             put_bits(pb, bits, cb->quantlist[i]);
00514     }
00515 }
00516 
00517 static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc)
00518 {
00519     int i;
00520 
00521     put_bits(pb, 16, 1); // type, only floor1 is supported
00522 
00523     put_bits(pb, 5, fc->partitions);
00524 
00525     for (i = 0; i < fc->partitions; i++)
00526         put_bits(pb, 4, fc->partition_to_class[i]);
00527 
00528     for (i = 0; i < fc->nclasses; i++) {
00529         int j, books;
00530 
00531         put_bits(pb, 3, fc->classes[i].dim - 1);
00532         put_bits(pb, 2, fc->classes[i].subclass);
00533 
00534         if (fc->classes[i].subclass)
00535             put_bits(pb, 8, fc->classes[i].masterbook);
00536 
00537         books = (1 << fc->classes[i].subclass);
00538 
00539         for (j = 0; j < books; j++)
00540             put_bits(pb, 8, fc->classes[i].books[j] + 1);
00541     }
00542 
00543     put_bits(pb, 2, fc->multiplier - 1);
00544     put_bits(pb, 4, fc->rangebits);
00545 
00546     for (i = 2; i < fc->values; i++)
00547         put_bits(pb, fc->rangebits, fc->list[i].x);
00548 }
00549 
00550 static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *rc)
00551 {
00552     int i;
00553 
00554     put_bits(pb, 16, rc->type);
00555 
00556     put_bits(pb, 24, rc->begin);
00557     put_bits(pb, 24, rc->end);
00558     put_bits(pb, 24, rc->partition_size - 1);
00559     put_bits(pb, 6, rc->classifications - 1);
00560     put_bits(pb, 8, rc->classbook);
00561 
00562     for (i = 0; i < rc->classifications; i++) {
00563         int j, tmp = 0;
00564         for (j = 0; j < 8; j++)
00565             tmp |= (rc->books[i][j] != -1) << j;
00566 
00567         put_bits(pb, 3, tmp & 7);
00568         put_bits(pb, 1, tmp > 7);
00569 
00570         if (tmp > 7)
00571             put_bits(pb, 5, tmp >> 3);
00572     }
00573 
00574     for (i = 0; i < rc->classifications; i++) {
00575         int j;
00576         for (j = 0; j < 8; j++)
00577             if (rc->books[i][j] != -1)
00578                 put_bits(pb, 8, rc->books[i][j]);
00579     }
00580 }
00581 
00582 static int put_main_header(vorbis_enc_context *venc, uint8_t **out)
00583 {
00584     int i;
00585     PutBitContext pb;
00586     uint8_t buffer[50000] = {0}, *p = buffer;
00587     int buffer_len = sizeof buffer;
00588     int len, hlens[3];
00589 
00590     // identification header
00591     init_put_bits(&pb, p, buffer_len);
00592     put_bits(&pb, 8, 1); //magic
00593     for (i = 0; "vorbis"[i]; i++)
00594         put_bits(&pb, 8, "vorbis"[i]);
00595     put_bits32(&pb, 0); // version
00596     put_bits(&pb,  8, venc->channels);
00597     put_bits32(&pb, venc->sample_rate);
00598     put_bits32(&pb, 0); // bitrate
00599     put_bits32(&pb, 0); // bitrate
00600     put_bits32(&pb, 0); // bitrate
00601     put_bits(&pb,  4, venc->log2_blocksize[0]);
00602     put_bits(&pb,  4, venc->log2_blocksize[1]);
00603     put_bits(&pb,  1, 1); // framing
00604 
00605     flush_put_bits(&pb);
00606     hlens[0] = put_bits_count(&pb) >> 3;
00607     buffer_len -= hlens[0];
00608     p += hlens[0];
00609 
00610     // comment header
00611     init_put_bits(&pb, p, buffer_len);
00612     put_bits(&pb, 8, 3); //magic
00613     for (i = 0; "vorbis"[i]; i++)
00614         put_bits(&pb, 8, "vorbis"[i]);
00615     put_bits32(&pb, 0); // vendor length TODO
00616     put_bits32(&pb, 0); // amount of comments
00617     put_bits(&pb,  1, 1); // framing
00618 
00619     flush_put_bits(&pb);
00620     hlens[1] = put_bits_count(&pb) >> 3;
00621     buffer_len -= hlens[1];
00622     p += hlens[1];
00623 
00624     // setup header
00625     init_put_bits(&pb, p, buffer_len);
00626     put_bits(&pb, 8, 5); //magic
00627     for (i = 0; "vorbis"[i]; i++)
00628         put_bits(&pb, 8, "vorbis"[i]);
00629 
00630     // codebooks
00631     put_bits(&pb, 8, venc->ncodebooks - 1);
00632     for (i = 0; i < venc->ncodebooks; i++)
00633         put_codebook_header(&pb, &venc->codebooks[i]);
00634 
00635     // time domain, reserved, zero
00636     put_bits(&pb,  6, 0);
00637     put_bits(&pb, 16, 0);
00638 
00639     // floors
00640     put_bits(&pb, 6, venc->nfloors - 1);
00641     for (i = 0; i < venc->nfloors; i++)
00642         put_floor_header(&pb, &venc->floors[i]);
00643 
00644     // residues
00645     put_bits(&pb, 6, venc->nresidues - 1);
00646     for (i = 0; i < venc->nresidues; i++)
00647         put_residue_header(&pb, &venc->residues[i]);
00648 
00649     // mappings
00650     put_bits(&pb, 6, venc->nmappings - 1);
00651     for (i = 0; i < venc->nmappings; i++) {
00652         vorbis_enc_mapping *mc = &venc->mappings[i];
00653         int j;
00654         put_bits(&pb, 16, 0); // mapping type
00655 
00656         put_bits(&pb, 1, mc->submaps > 1);
00657         if (mc->submaps > 1)
00658             put_bits(&pb, 4, mc->submaps - 1);
00659 
00660         put_bits(&pb, 1, !!mc->coupling_steps);
00661         if (mc->coupling_steps) {
00662             put_bits(&pb, 8, mc->coupling_steps - 1);
00663             for (j = 0; j < mc->coupling_steps; j++) {
00664                 put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
00665                 put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
00666             }
00667         }
00668 
00669         put_bits(&pb, 2, 0); // reserved
00670 
00671         if (mc->submaps > 1)
00672             for (j = 0; j < venc->channels; j++)
00673                 put_bits(&pb, 4, mc->mux[j]);
00674 
00675         for (j = 0; j < mc->submaps; j++) {
00676             put_bits(&pb, 8, 0); // reserved time configuration
00677             put_bits(&pb, 8, mc->floor[j]);
00678             put_bits(&pb, 8, mc->residue[j]);
00679         }
00680     }
00681 
00682     // modes
00683     put_bits(&pb, 6, venc->nmodes - 1);
00684     for (i = 0; i < venc->nmodes; i++) {
00685         put_bits(&pb, 1, venc->modes[i].blockflag);
00686         put_bits(&pb, 16, 0); // reserved window type
00687         put_bits(&pb, 16, 0); // reserved transform type
00688         put_bits(&pb, 8, venc->modes[i].mapping);
00689     }
00690 
00691     put_bits(&pb, 1, 1); // framing
00692 
00693     flush_put_bits(&pb);
00694     hlens[2] = put_bits_count(&pb) >> 3;
00695 
00696     len = hlens[0] + hlens[1] + hlens[2];
00697     p = *out = av_mallocz(64 + len + len/255);
00698     if (!p)
00699         return AVERROR(ENOMEM);
00700 
00701     *p++ = 2;
00702     p += av_xiphlacing(p, hlens[0]);
00703     p += av_xiphlacing(p, hlens[1]);
00704     buffer_len = 0;
00705     for (i = 0; i < 3; i++) {
00706         memcpy(p, buffer + buffer_len, hlens[i]);
00707         p += hlens[i];
00708         buffer_len += hlens[i];
00709     }
00710 
00711     return p - *out;
00712 }
00713 
00714 static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i)
00715 {
00716     int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
00717     int end   = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
00718     int j;
00719     float average = 0;
00720 
00721     for (j = begin; j < end; j++)
00722         average += fabs(coeffs[j]);
00723     return average / (end - begin);
00724 }
00725 
00726 static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc,
00727                       float *coeffs, uint16_t *posts, int samples)
00728 {
00729     int range = 255 / fc->multiplier + 1;
00730     int i;
00731     float tot_average = 0.;
00732     float averages[MAX_FLOOR_VALUES];
00733     for (i = 0; i < fc->values; i++) {
00734         averages[i] = get_floor_average(fc, coeffs, i);
00735         tot_average += averages[i];
00736     }
00737     tot_average /= fc->values;
00738     tot_average /= venc->quality;
00739 
00740     for (i = 0; i < fc->values; i++) {
00741         int position  = fc->list[fc->list[i].sort].x;
00742         float average = averages[i];
00743         int j;
00744 
00745         average = sqrt(tot_average * average) * pow(1.25f, position*0.005f); // MAGIC!
00746         for (j = 0; j < range - 1; j++)
00747             if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average)
00748                 break;
00749         posts[fc->list[i].sort] = j;
00750     }
00751 }
00752 
00753 static int render_point(int x0, int y0, int x1, int y1, int x)
00754 {
00755     return y0 +  (x - x0) * (y1 - y0) / (x1 - x0);
00756 }
00757 
00758 static int floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,
00759                         PutBitContext *pb, uint16_t *posts,
00760                         float *floor, int samples)
00761 {
00762     int range = 255 / fc->multiplier + 1;
00763     int coded[MAX_FLOOR_VALUES]; // first 2 values are unused
00764     int i, counter;
00765 
00766     if (pb->size_in_bits - put_bits_count(pb) < 1 + 2 * ilog(range - 1))
00767         return AVERROR(EINVAL);
00768     put_bits(pb, 1, 1); // non zero
00769     put_bits(pb, ilog(range - 1), posts[0]);
00770     put_bits(pb, ilog(range - 1), posts[1]);
00771     coded[0] = coded[1] = 1;
00772 
00773     for (i = 2; i < fc->values; i++) {
00774         int predicted = render_point(fc->list[fc->list[i].low].x,
00775                                      posts[fc->list[i].low],
00776                                      fc->list[fc->list[i].high].x,
00777                                      posts[fc->list[i].high],
00778                                      fc->list[i].x);
00779         int highroom = range - predicted;
00780         int lowroom = predicted;
00781         int room = FFMIN(highroom, lowroom);
00782         if (predicted == posts[i]) {
00783             coded[i] = 0; // must be used later as flag!
00784             continue;
00785         } else {
00786             if (!coded[fc->list[i].low ])
00787                 coded[fc->list[i].low ] = -1;
00788             if (!coded[fc->list[i].high])
00789                 coded[fc->list[i].high] = -1;
00790         }
00791         if (posts[i] > predicted) {
00792             if (posts[i] - predicted > room)
00793                 coded[i] = posts[i] - predicted + lowroom;
00794             else
00795                 coded[i] = (posts[i] - predicted) << 1;
00796         } else {
00797             if (predicted - posts[i] > room)
00798                 coded[i] = predicted - posts[i] + highroom - 1;
00799             else
00800                 coded[i] = ((predicted - posts[i]) << 1) - 1;
00801         }
00802     }
00803 
00804     counter = 2;
00805     for (i = 0; i < fc->partitions; i++) {
00806         vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
00807         int k, cval = 0, csub = 1<<c->subclass;
00808         if (c->subclass) {
00809             vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
00810             int cshift = 0;
00811             for (k = 0; k < c->dim; k++) {
00812                 int l;
00813                 for (l = 0; l < csub; l++) {
00814                     int maxval = 1;
00815                     if (c->books[l] != -1)
00816                         maxval = venc->codebooks[c->books[l]].nentries;
00817                     // coded could be -1, but this still works, cause that is 0
00818                     if (coded[counter + k] < maxval)
00819                         break;
00820                 }
00821                 assert(l != csub);
00822                 cval   |= l << cshift;
00823                 cshift += c->subclass;
00824             }
00825             if (put_codeword(pb, book, cval))
00826                 return AVERROR(EINVAL);
00827         }
00828         for (k = 0; k < c->dim; k++) {
00829             int book  = c->books[cval & (csub-1)];
00830             int entry = coded[counter++];
00831             cval >>= c->subclass;
00832             if (book == -1)
00833                 continue;
00834             if (entry == -1)
00835                 entry = 0;
00836             if (put_codeword(pb, &venc->codebooks[book], entry))
00837                 return AVERROR(EINVAL);
00838         }
00839     }
00840 
00841     ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded,
00842                                  fc->multiplier, floor, samples);
00843 
00844     return 0;
00845 }
00846 
00847 static float *put_vector(vorbis_enc_codebook *book, PutBitContext *pb,
00848                          float *num)
00849 {
00850     int i, entry = -1;
00851     float distance = FLT_MAX;
00852     assert(book->dimensions);
00853     for (i = 0; i < book->nentries; i++) {
00854         float * vec = book->dimensions + i * book->ndimensions, d = book->pow2[i];
00855         int j;
00856         if (!book->lens[i])
00857             continue;
00858         for (j = 0; j < book->ndimensions; j++)
00859             d -= vec[j] * num[j];
00860         if (distance > d) {
00861             entry    = i;
00862             distance = d;
00863         }
00864     }
00865     if (put_codeword(pb, book, entry))
00866         return NULL;
00867     return &book->dimensions[entry * book->ndimensions];
00868 }
00869 
00870 static int residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,
00871                           PutBitContext *pb, float *coeffs, int samples,
00872                           int real_ch)
00873 {
00874     int pass, i, j, p, k;
00875     int psize      = rc->partition_size;
00876     int partitions = (rc->end - rc->begin) / psize;
00877     int channels   = (rc->type == 2) ? 1 : real_ch;
00878     int classes[MAX_CHANNELS][NUM_RESIDUE_PARTITIONS];
00879     int classwords = venc->codebooks[rc->classbook].ndimensions;
00880 
00881     assert(rc->type == 2);
00882     assert(real_ch == 2);
00883     for (p = 0; p < partitions; p++) {
00884         float max1 = 0., max2 = 0.;
00885         int s = rc->begin + p * psize;
00886         for (k = s; k < s + psize; k += 2) {
00887             max1 = FFMAX(max1, fabs(coeffs[          k / real_ch]));
00888             max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
00889         }
00890 
00891         for (i = 0; i < rc->classifications - 1; i++)
00892             if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1])
00893                 break;
00894         classes[0][p] = i;
00895     }
00896 
00897     for (pass = 0; pass < 8; pass++) {
00898         p = 0;
00899         while (p < partitions) {
00900             if (pass == 0)
00901                 for (j = 0; j < channels; j++) {
00902                     vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
00903                     int entry = 0;
00904                     for (i = 0; i < classwords; i++) {
00905                         entry *= rc->classifications;
00906                         entry += classes[j][p + i];
00907                     }
00908                     if (put_codeword(pb, book, entry))
00909                         return AVERROR(EINVAL);
00910                 }
00911             for (i = 0; i < classwords && p < partitions; i++, p++) {
00912                 for (j = 0; j < channels; j++) {
00913                     int nbook = rc->books[classes[j][p]][pass];
00914                     vorbis_enc_codebook * book = &venc->codebooks[nbook];
00915                     float *buf = coeffs + samples*j + rc->begin + p*psize;
00916                     if (nbook == -1)
00917                         continue;
00918 
00919                     assert(rc->type == 0 || rc->type == 2);
00920                     assert(!(psize % book->ndimensions));
00921 
00922                     if (rc->type == 0) {
00923                         for (k = 0; k < psize; k += book->ndimensions) {
00924                             int l;
00925                             float *a = put_vector(book, pb, &buf[k]);
00926                             if (!a)
00927                                 return AVERROR(EINVAL);
00928                             for (l = 0; l < book->ndimensions; l++)
00929                                 buf[k + l] -= a[l];
00930                         }
00931                     } else {
00932                         int s = rc->begin + p * psize, a1, b1;
00933                         a1 = (s % real_ch) * samples;
00934                         b1 =  s / real_ch;
00935                         s  = real_ch * samples;
00936                         for (k = 0; k < psize; k += book->ndimensions) {
00937                             int dim, a2 = a1, b2 = b1;
00938                             float vec[MAX_CODEBOOK_DIM], *pv = vec;
00939                             for (dim = book->ndimensions; dim--; ) {
00940                                 *pv++ = coeffs[a2 + b2];
00941                                 if ((a2 += samples) == s) {
00942                                     a2 = 0;
00943                                     b2++;
00944                                 }
00945                             }
00946                             pv = put_vector(book, pb, vec);
00947                             if (!pv)
00948                                 return AVERROR(EINVAL);
00949                             for (dim = book->ndimensions; dim--; ) {
00950                                 coeffs[a1 + b1] -= *pv++;
00951                                 if ((a1 += samples) == s) {
00952                                     a1 = 0;
00953                                     b1++;
00954                                 }
00955                             }
00956                         }
00957                     }
00958                 }
00959             }
00960         }
00961     }
00962     return 0;
00963 }
00964 
00965 static int apply_window_and_mdct(vorbis_enc_context *venc, const signed short *audio,
00966                                  int samples)
00967 {
00968     int i, j, channel;
00969     const float * win = venc->win[0];
00970     int window_len = 1 << (venc->log2_blocksize[0] - 1);
00971     float n = (float)(1 << venc->log2_blocksize[0]) / 4.;
00972     // FIXME use dsp
00973 
00974     if (!venc->have_saved && !samples)
00975         return 0;
00976 
00977     if (venc->have_saved) {
00978         for (channel = 0; channel < venc->channels; channel++)
00979             memcpy(venc->samples + channel * window_len * 2,
00980                    venc->saved + channel * window_len, sizeof(float) * window_len);
00981     } else {
00982         for (channel = 0; channel < venc->channels; channel++)
00983             memset(venc->samples + channel * window_len * 2, 0,
00984                    sizeof(float) * window_len);
00985     }
00986 
00987     if (samples) {
00988         for (channel = 0; channel < venc->channels; channel++) {
00989             float * offset = venc->samples + channel*window_len*2 + window_len;
00990             j = channel;
00991             for (i = 0; i < samples; i++, j += venc->channels)
00992                 offset[i] = audio[j] / 32768. / n * win[window_len - i - 1];
00993         }
00994     } else {
00995         for (channel = 0; channel < venc->channels; channel++)
00996             memset(venc->samples + channel * window_len * 2 + window_len,
00997                    0, sizeof(float) * window_len);
00998     }
00999 
01000     for (channel = 0; channel < venc->channels; channel++)
01001         venc->mdct[0].mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,
01002                      venc->samples + channel * window_len * 2);
01003 
01004     if (samples) {
01005         for (channel = 0; channel < venc->channels; channel++) {
01006             float *offset = venc->saved + channel * window_len;
01007             j = channel;
01008             for (i = 0; i < samples; i++, j += venc->channels)
01009                 offset[i] = audio[j] / 32768. / n * win[i];
01010         }
01011         venc->have_saved = 1;
01012     } else {
01013         venc->have_saved = 0;
01014     }
01015     return 1;
01016 }
01017 
01018 static int vorbis_encode_frame(AVCodecContext *avccontext, AVPacket *avpkt,
01019                                const AVFrame *frame, int *got_packet_ptr)
01020 {
01021     vorbis_enc_context *venc = avccontext->priv_data;
01022     const int16_t *audio = frame ? (const int16_t *)frame->data[0] : NULL;
01023     int samples = frame ? frame->nb_samples : 0;
01024     vorbis_enc_mode *mode;
01025     vorbis_enc_mapping *mapping;
01026     PutBitContext pb;
01027     int i, ret;
01028 
01029     if (!apply_window_and_mdct(venc, audio, samples))
01030         return 0;
01031     samples = 1 << (venc->log2_blocksize[0] - 1);
01032 
01033     if ((ret = ff_alloc_packet2(avccontext, avpkt, 8192)))
01034         return ret;
01035 
01036     init_put_bits(&pb, avpkt->data, avpkt->size);
01037 
01038     if (pb.size_in_bits - put_bits_count(&pb) < 1 + ilog(venc->nmodes - 1)) {
01039         av_log(avccontext, AV_LOG_ERROR, "output buffer is too small\n");
01040         return AVERROR(EINVAL);
01041     }
01042 
01043     put_bits(&pb, 1, 0); // magic bit
01044 
01045     put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
01046 
01047     mode    = &venc->modes[0];
01048     mapping = &venc->mappings[mode->mapping];
01049     if (mode->blockflag) {
01050         put_bits(&pb, 1, 0);
01051         put_bits(&pb, 1, 0);
01052     }
01053 
01054     for (i = 0; i < venc->channels; i++) {
01055         vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
01056         uint16_t posts[MAX_FLOOR_VALUES];
01057         floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
01058         if (floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples)) {
01059             av_log(avccontext, AV_LOG_ERROR, "output buffer is too small\n");
01060             return AVERROR(EINVAL);
01061         }
01062     }
01063 
01064     for (i = 0; i < venc->channels * samples; i++)
01065         venc->coeffs[i] /= venc->floor[i];
01066 
01067     for (i = 0; i < mapping->coupling_steps; i++) {
01068         float *mag = venc->coeffs + mapping->magnitude[i] * samples;
01069         float *ang = venc->coeffs + mapping->angle[i]     * samples;
01070         int j;
01071         for (j = 0; j < samples; j++) {
01072             float a = ang[j];
01073             ang[j] -= mag[j];
01074             if (mag[j] > 0)
01075                 ang[j] = -ang[j];
01076             if (ang[j] < 0)
01077                 mag[j] = a;
01078         }
01079     }
01080 
01081     if (residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],
01082                        &pb, venc->coeffs, samples, venc->channels)) {
01083         av_log(avccontext, AV_LOG_ERROR, "output buffer is too small\n");
01084         return AVERROR(EINVAL);
01085     }
01086 
01087     flush_put_bits(&pb);
01088     avpkt->size = put_bits_count(&pb) >> 3;
01089 
01090     avpkt->duration = ff_samples_to_time_base(avccontext, avccontext->frame_size);
01091     if (frame)
01092         if (frame->pts != AV_NOPTS_VALUE)
01093             avpkt->pts = ff_samples_to_time_base(avccontext, frame->pts);
01094     else
01095         avpkt->pts = venc->next_pts;
01096     if (avpkt->pts != AV_NOPTS_VALUE)
01097         venc->next_pts = avpkt->pts + avpkt->duration;
01098 
01099     *got_packet_ptr = 1;
01100     return 0;
01101 }
01102 
01103 
01104 static av_cold int vorbis_encode_close(AVCodecContext *avccontext)
01105 {
01106     vorbis_enc_context *venc = avccontext->priv_data;
01107     int i;
01108 
01109     if (venc->codebooks)
01110         for (i = 0; i < venc->ncodebooks; i++) {
01111             av_freep(&venc->codebooks[i].lens);
01112             av_freep(&venc->codebooks[i].codewords);
01113             av_freep(&venc->codebooks[i].quantlist);
01114             av_freep(&venc->codebooks[i].dimensions);
01115             av_freep(&venc->codebooks[i].pow2);
01116         }
01117     av_freep(&venc->codebooks);
01118 
01119     if (venc->floors)
01120         for (i = 0; i < venc->nfloors; i++) {
01121             int j;
01122             if (venc->floors[i].classes)
01123                 for (j = 0; j < venc->floors[i].nclasses; j++)
01124                     av_freep(&venc->floors[i].classes[j].books);
01125             av_freep(&venc->floors[i].classes);
01126             av_freep(&venc->floors[i].partition_to_class);
01127             av_freep(&venc->floors[i].list);
01128         }
01129     av_freep(&venc->floors);
01130 
01131     if (venc->residues)
01132         for (i = 0; i < venc->nresidues; i++) {
01133             av_freep(&venc->residues[i].books);
01134             av_freep(&venc->residues[i].maxes);
01135         }
01136     av_freep(&venc->residues);
01137 
01138     if (venc->mappings)
01139         for (i = 0; i < venc->nmappings; i++) {
01140             av_freep(&venc->mappings[i].mux);
01141             av_freep(&venc->mappings[i].floor);
01142             av_freep(&venc->mappings[i].residue);
01143             av_freep(&venc->mappings[i].magnitude);
01144             av_freep(&venc->mappings[i].angle);
01145         }
01146     av_freep(&venc->mappings);
01147 
01148     av_freep(&venc->modes);
01149 
01150     av_freep(&venc->saved);
01151     av_freep(&venc->samples);
01152     av_freep(&venc->floor);
01153     av_freep(&venc->coeffs);
01154 
01155     ff_mdct_end(&venc->mdct[0]);
01156     ff_mdct_end(&venc->mdct[1]);
01157 
01158 #if FF_API_OLD_ENCODE_AUDIO
01159     av_freep(&avccontext->coded_frame);
01160 #endif
01161     av_freep(&avccontext->extradata);
01162 
01163     return 0 ;
01164 }
01165 
01166 static av_cold int vorbis_encode_init(AVCodecContext *avccontext)
01167 {
01168     vorbis_enc_context *venc = avccontext->priv_data;
01169     int ret;
01170 
01171     if (avccontext->channels != 2) {
01172         av_log(avccontext, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");
01173         return -1;
01174     }
01175 
01176     if ((ret = create_vorbis_context(venc, avccontext)) < 0)
01177         goto error;
01178 
01179     if (avccontext->flags & CODEC_FLAG_QSCALE)
01180         venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
01181     else
01182         venc->quality = 8;
01183     venc->quality *= venc->quality;
01184 
01185     if ((ret = put_main_header(venc, (uint8_t**)&avccontext->extradata)) < 0)
01186         goto error;
01187     avccontext->extradata_size = ret;
01188 
01189     avccontext->frame_size = 1 << (venc->log2_blocksize[0] - 1);
01190 
01191 #if FF_API_OLD_ENCODE_AUDIO
01192     avccontext->coded_frame = avcodec_alloc_frame();
01193     if (!avccontext->coded_frame) {
01194         ret = AVERROR(ENOMEM);
01195         goto error;
01196     }
01197 #endif
01198 
01199     return 0;
01200 error:
01201     vorbis_encode_close(avccontext);
01202     return ret;
01203 }
01204 
01205 AVCodec ff_vorbis_encoder = {
01206     .name           = "vorbis",
01207     .type           = AVMEDIA_TYPE_AUDIO,
01208     .id             = CODEC_ID_VORBIS,
01209     .priv_data_size = sizeof(vorbis_enc_context),
01210     .init           = vorbis_encode_init,
01211     .encode2        = vorbis_encode_frame,
01212     .close          = vorbis_encode_close,
01213     .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL,
01214     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
01215                                                      AV_SAMPLE_FMT_NONE },
01216     .long_name      = NULL_IF_CONFIG_SMALL("Vorbis"),
01217 };