vorbisenc.c 34.7 KB
Newer Older
Oded Shimon's avatar
Oded Shimon committed
1 2 3
/*
 * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
 *
4
 * This file is part of Libav.
5
 *
6
 * Libav is free software; you can redistribute it and/or
Oded Shimon's avatar
Oded Shimon committed
7 8
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
Oded Shimon's avatar
Oded Shimon committed
10
 *
11
 * Libav is distributed in the hope that it will be useful,
Oded Shimon's avatar
Oded Shimon committed
12 13 14 15 16
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with Libav; if not, write to the Free Software
18
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Oded Shimon's avatar
Oded Shimon committed
19 20 21
 */

/**
22
 * @file
Oded Shimon's avatar
Oded Shimon committed
23 24 25 26
 * Native Vorbis encoder.
 * @author Oded Shimon <ods15@ods15.dyndns.org>
 */

27
#include <float.h>
Oded Shimon's avatar
Oded Shimon committed
28
#include "avcodec.h"
29
#include "dsputil.h"
30
#include "fft.h"
31
#include "vorbis.h"
32
#include "vorbis_enc_data.h"
33

34
#define BITSTREAM_WRITER_LE
35
#include "put_bits.h"
36

Oded Shimon's avatar
Oded Shimon committed
37 38 39
#undef NDEBUG
#include <assert.h>

40 41
typedef struct {
    int nentries;
42 43
    uint8_t *lens;
    uint32_t *codewords;
44 45 46 47 48
    int ndimentions;
    float min;
    float delta;
    int seq_p;
    int lookup;
49 50 51
    int *quantlist;
    float *dimentions;
    float *pow2;
52
} vorbis_enc_codebook;
53

54
typedef struct {
55 56 57
    int dim;
    int subclass;
    int masterbook;
58
    int *books;
59
} vorbis_enc_floor_class;
60 61 62

typedef struct {
    int partitions;
63
    int *partition_to_class;
64
    int nclasses;
65
    vorbis_enc_floor_class *classes;
66 67 68
    int multiplier;
    int rangebits;
    int values;
69
    vorbis_floor1_entry *list;
70
} vorbis_enc_floor;
71 72

typedef struct {
73 74 75 76 77 78
    int type;
    int begin;
    int end;
    int partition_size;
    int classifications;
    int classbook;
79
    int8_t (*books)[8];
80
    float (*maxes)[2];
81
} vorbis_enc_residue;
82 83

typedef struct {
84
    int submaps;
85 86 87
    int *mux;
    int *floor;
    int *residue;
88
    int coupling_steps;
89 90
    int *magnitude;
    int *angle;
91
} vorbis_enc_mapping;
92

93 94 95
typedef struct {
    int blockflag;
    int mapping;
96
} vorbis_enc_mode;
97

98
typedef struct {
99 100
    int channels;
    int sample_rate;
101
    int log2_blocksize[2];
102
    FFTContext mdct[2];
103
    const float *win[2];
104
    int have_saved;
105 106 107 108
    float *saved;
    float *samples;
    float *floor;  // also used for tmp values for mdct
    float *coeffs; // also used for residue after floor
109
    float quality;
110

111
    int ncodebooks;
112
    vorbis_enc_codebook *codebooks;
113 114

    int nfloors;
115
    vorbis_enc_floor *floors;
116 117

    int nresidues;
118
    vorbis_enc_residue *residues;
119 120

    int nmappings;
121
    vorbis_enc_mapping *mappings;
122 123

    int nmodes;
124
    vorbis_enc_mode *modes;
125 126

    int64_t sample_count;
127
} vorbis_enc_context;
Oded Shimon's avatar
Oded Shimon committed
128

Måns Rullgård's avatar
Måns Rullgård committed
129 130 131 132 133 134 135 136 137 138 139
#define MAX_CHANNELS     2
#define MAX_CODEBOOK_DIM 8

#define MAX_FLOOR_CLASS_DIM  4
#define NUM_FLOOR_PARTITIONS 8
#define MAX_FLOOR_VALUES     (MAX_FLOOR_CLASS_DIM*NUM_FLOOR_PARTITIONS+2)

#define RESIDUE_SIZE           1600
#define RESIDUE_PART_SIZE      32
#define NUM_RESIDUE_PARTITIONS (RESIDUE_SIZE/RESIDUE_PART_SIZE)

140
static inline void put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb,
141 142
                                int entry)
{
143 144 145 146 147 148
    assert(entry >= 0);
    assert(entry < cb->nentries);
    assert(cb->lens[entry]);
    put_bits(pb, cb->lens[entry], cb->codewords[entry]);
}

149 150 151 152 153
static int cb_lookup_vals(int lookup, int dimentions, int entries)
{
    if (lookup == 1)
        return ff_vorbis_nth_root(entries, dimentions);
    else if (lookup == 2)
154
        return dimentions *entries;
155 156 157
    return 0;
}

158
static void ready_codebook(vorbis_enc_codebook *cb)
159
{
160 161
    int i;

162
    ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
163

164
    if (!cb->lookup) {
165
        cb->pow2 = cb->dimentions = NULL;
166
    } else {
167 168
        int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
        cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions);
169
        cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
170 171 172 173 174 175
        for (i = 0; i < cb->nentries; i++) {
            float last = 0;
            int j;
            int div = 1;
            for (j = 0; j < cb->ndimentions; j++) {
                int off;
176 177 178 179
                if (cb->lookup == 1)
                    off = (i / div) % vals; // lookup type 1
                else
                    off = i * cb->ndimentions + j; // lookup type 2
180 181

                cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
182 183
                if (cb->seq_p)
                    last = cb->dimentions[i * cb->ndimentions + j];
184
                cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j] * cb->dimentions[i * cb->ndimentions + j];
185 186
                div *= vals;
            }
187
            cb->pow2[i] /= 2.;
188 189 190 191
        }
    }
}

192
static void ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc)
193
{
194 195 196 197 198
    int i;
    assert(rc->type == 2);
    rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
    for (i = 0; i < rc->classifications; i++) {
        int j;
199
        vorbis_enc_codebook * cb;
200
        for (j = 0; j < 8; j++)
201 202
            if (rc->books[i][j] != -1)
                break;
203 204
        if (j == 8) // zero
            continue;
205 206 207 208 209 210
        cb = &venc->codebooks[rc->books[i][j]];
        assert(cb->ndimentions >= 2);
        assert(cb->lookup);

        for (j = 0; j < cb->nentries; j++) {
            float a;
211 212
            if (!cb->lens[j])
                continue;
213
            a = fabs(cb->dimentions[j * cb->ndimentions]);
214 215
            if (a > rc->maxes[i][0])
                rc->maxes[i][0] = a;
216
            a = fabs(cb->dimentions[j * cb->ndimentions + 1]);
217 218
            if (a > rc->maxes[i][1])
                rc->maxes[i][1] = a;
219 220 221 222 223 224 225 226 227
        }
    }
    // small bias
    for (i = 0; i < rc->classifications; i++) {
        rc->maxes[i][0] += 0.8;
        rc->maxes[i][1] += 0.8;
    }
}

228 229
static void create_vorbis_context(vorbis_enc_context *venc,
                                  AVCodecContext *avccontext)
230
{
231 232 233
    vorbis_enc_floor   *fc;
    vorbis_enc_residue *rc;
    vorbis_enc_mapping *mc;
234
    int i, book;
235

236
    venc->channels    = avccontext->channels;
237
    venc->sample_rate = avccontext->sample_rate;
238
    venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
239

240
    venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);
241
    venc->codebooks  = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
242

243
    // codebook 0..14 - floor1 book, values 0..255
244 245 246
    // codebook 15 residue masterbook
    // codebook 16..29 residue
    for (book = 0; book < venc->ncodebooks; book++) {
247
        vorbis_enc_codebook *cb = &venc->codebooks[book];
248 249
        int vals;
        cb->ndimentions = cvectors[book].dim;
250 251 252 253 254
        cb->nentries    = cvectors[book].real_len;
        cb->min         = cvectors[book].min;
        cb->delta       = cvectors[book].delta;
        cb->lookup      = cvectors[book].lookup;
        cb->seq_p       = 0;
255

256
        cb->lens      = av_malloc(sizeof(uint8_t)  * cb->nentries);
257 258 259 260
        cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
        memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
        memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);

261 262 263
        if (cb->lookup) {
            vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
            cb->quantlist = av_malloc(sizeof(int) * vals);
264 265
            for (i = 0; i < vals; i++)
                cb->quantlist[i] = cvectors[book].quant[i];
266 267 268
        } else {
            cb->quantlist = NULL;
        }
269 270
        ready_codebook(cb);
    }
271

272
    venc->nfloors = 1;
273
    venc->floors  = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);
274

275 276
    // just 1 floor
    fc = &venc->floors[0];
Måns Rullgård's avatar
Måns Rullgård committed
277
    fc->partitions         = NUM_FLOOR_PARTITIONS;
278
    fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
279
    fc->nclasses           = 0;
280
    for (i = 0; i < fc->partitions; i++) {
281
        static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4};
282 283 284 285
        fc->partition_to_class[i] = a[i];
        fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
    }
    fc->nclasses++;
286
    fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses);
287
    for (i = 0; i < fc->nclasses; i++) {
288
        vorbis_enc_floor_class * c = &fc->classes[i];
289
        int j, books;
290 291
        c->dim        = floor_classes[i].dim;
        c->subclass   = floor_classes[i].subclass;
292
        c->masterbook = floor_classes[i].masterbook;
293 294
        books         = (1 << c->subclass);
        c->books      = av_malloc(sizeof(int) * books);
295 296
        for (j = 0; j < books; j++)
            c->books[j] = floor_classes[i].nbooks[j];
297
    }
298
    fc->multiplier = 2;
299
    fc->rangebits  = venc->log2_blocksize[0] - 1;
300 301 302 303 304

    fc->values = 2;
    for (i = 0; i < fc->partitions; i++)
        fc->values += fc->classes[fc->partition_to_class[i]].dim;

305
    fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);
306 307
    fc->list[0].x = 0;
    fc->list[1].x = 1 << fc->rangebits;
308
    for (i = 2; i < fc->values; i++) {
309 310 311 312 313
        static const int a[] = {
             93, 23,372,  6, 46,186,750, 14, 33, 65,
            130,260,556,  3, 10, 18, 28, 39, 55, 79,
            111,158,220,312,464,650,850
        };
314
        fc->list[i].x = a[i - 2];
315
    }
316
    ff_vorbis_ready_floor1_list(fc->list, fc->values);
317 318

    venc->nresidues = 1;
319
    venc->residues  = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
320

321 322
    // single residue
    rc = &venc->residues[0];
323 324 325 326
    rc->type            = 2;
    rc->begin           = 0;
    rc->end             = 1600;
    rc->partition_size  = 32;
327
    rc->classifications = 10;
328 329
    rc->classbook       = 15;
    rc->books           = av_malloc(sizeof(*rc->books) * rc->classifications);
330 331
    {
        static const int8_t a[10][8] = {
332 333 334 335 336 337 338 339 340 341 342
            { -1, -1, -1, -1, -1, -1, -1, -1, },
            { -1, -1, 16, -1, -1, -1, -1, -1, },
            { -1, -1, 17, -1, -1, -1, -1, -1, },
            { -1, -1, 18, -1, -1, -1, -1, -1, },
            { -1, -1, 19, -1, -1, -1, -1, -1, },
            { -1, -1, 20, -1, -1, -1, -1, -1, },
            { -1, -1, 21, -1, -1, -1, -1, -1, },
            { 22, 23, -1, -1, -1, -1, -1, -1, },
            { 24, 25, -1, -1, -1, -1, -1, -1, },
            { 26, 27, 28, -1, -1, -1, -1, -1, },
        };
343
        memcpy(rc->books, a, sizeof a);
344
    }
345
    ready_residue(rc, venc);
346

347
    venc->nmappings = 1;
348
    venc->mappings  = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
349

350 351 352
    // single mapping
    mc = &venc->mappings[0];
    mc->submaps = 1;
353
    mc->mux     = av_malloc(sizeof(int) * venc->channels);
354 355
    for (i = 0; i < venc->channels; i++)
        mc->mux[i] = 0;
356
    mc->floor   = av_malloc(sizeof(int) * mc->submaps);
357 358
    mc->residue = av_malloc(sizeof(int) * mc->submaps);
    for (i = 0; i < mc->submaps; i++) {
359
        mc->floor[i]   = 0;
360 361
        mc->residue[i] = 0;
    }
362
    mc->coupling_steps = venc->channels == 2 ? 1 : 0;
363 364
    mc->magnitude      = av_malloc(sizeof(int) * mc->coupling_steps);
    mc->angle          = av_malloc(sizeof(int) * mc->coupling_steps);
365 366
    if (mc->coupling_steps) {
        mc->magnitude[0] = 0;
367
        mc->angle[0]     = 1;
368
    }
369

370
    venc->nmodes = 1;
371
    venc->modes  = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
372 373 374

    // single mode
    venc->modes[0].blockflag = 0;
375
    venc->modes[0].mapping   = 0;
376

377
    venc->have_saved = 0;
378 379 380 381
    venc->saved      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
    venc->samples    = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
    venc->floor      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
    venc->coeffs     = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
382

383 384
    venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
    venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
385

386 387
    ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0);
    ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0);
388 389
}

390
static void put_float(PutBitContext *pb, float f)
391
{
392 393 394 395
    int exp, mant;
    uint32_t res = 0;
    mant = (int)ldexp(frexp(f, &exp), 20);
    exp += 788 - 20;
396
    if (mant < 0) {
397
        res |= (1U << 31);
398 399
        mant = -mant;
    }
400
    res |= mant | (exp << 21);
401
    put_bits32(pb, res);
402 403
}

404
static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb)
405
{
406 407 408 409 410 411 412
    int i;
    int ordered = 0;

    put_bits(pb, 24, 0x564342); //magic
    put_bits(pb, 16, cb->ndimentions);
    put_bits(pb, 24, cb->nentries);

413
    for (i = 1; i < cb->nentries; i++)
414 415
        if (cb->lens[i] < cb->lens[i-1])
            break;
416 417
    if (i == cb->nentries)
        ordered = 1;
418 419 420

    put_bits(pb, 1, ordered);
    if (ordered) {
421
        int len = cb->lens[0];
422
        put_bits(pb, 5, len - 1);
423 424
        i = 0;
        while (i < cb->nentries) {
425
            int j;
426
            for (j = 0; j+i < cb->nentries; j++)
427 428
                if (cb->lens[j+i] != len)
                    break;
429
            put_bits(pb, ilog(cb->nentries - i), j);
430 431 432 433 434
            i += j;
            len++;
        }
    } else {
        int sparse = 0;
435
        for (i = 0; i < cb->nentries; i++)
436 437
            if (!cb->lens[i])
                break;
438 439
        if (i != cb->nentries)
            sparse = 1;
440 441 442
        put_bits(pb, 1, sparse);

        for (i = 0; i < cb->nentries; i++) {
443 444 445 446
            if (sparse)
                put_bits(pb, 1, !!cb->lens[i]);
            if (cb->lens[i])
                put_bits(pb, 5, cb->lens[i] - 1);
447 448 449 450 451
        }
    }

    put_bits(pb, 4, cb->lookup);
    if (cb->lookup) {
452
        int tmp  = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
453
        int bits = ilog(cb->quantlist[0]);
454

455 456
        for (i = 1; i < tmp; i++)
            bits = FFMAX(bits, ilog(cb->quantlist[i]));
457

458 459
        put_float(pb, cb->min);
        put_float(pb, cb->delta);
460

461 462
        put_bits(pb, 4, bits - 1);
        put_bits(pb, 1, cb->seq_p);
463

464 465
        for (i = 0; i < tmp; i++)
            put_bits(pb, bits, cb->quantlist[i]);
466 467 468
    }
}

469
static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc)
470
{
471 472 473 474 475 476
    int i;

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

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

477 478
    for (i = 0; i < fc->partitions; i++)
        put_bits(pb, 4, fc->partition_to_class[i]);
479 480 481 482 483 484 485

    for (i = 0; i < fc->nclasses; i++) {
        int j, books;

        put_bits(pb, 3, fc->classes[i].dim - 1);
        put_bits(pb, 2, fc->classes[i].subclass);

486 487
        if (fc->classes[i].subclass)
            put_bits(pb, 8, fc->classes[i].masterbook);
488 489 490

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

491 492
        for (j = 0; j < books; j++)
            put_bits(pb, 8, fc->classes[i].books[j] + 1);
493 494 495 496 497
    }

    put_bits(pb, 2, fc->multiplier - 1);
    put_bits(pb, 4, fc->rangebits);

498 499
    for (i = 2; i < fc->values; i++)
        put_bits(pb, fc->rangebits, fc->list[i].x);
500 501
}

502
static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *rc)
503
{
504 505 506 507 508 509 510
    int i;

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

    put_bits(pb, 24, rc->begin);
    put_bits(pb, 24, rc->end);
    put_bits(pb, 24, rc->partition_size - 1);
511
    put_bits(pb, 6, rc->classifications - 1);
512 513 514 515
    put_bits(pb, 8, rc->classbook);

    for (i = 0; i < rc->classifications; i++) {
        int j, tmp = 0;
516 517
        for (j = 0; j < 8; j++)
            tmp |= (rc->books[i][j] != -1) << j;
518 519 520 521

        put_bits(pb, 3, tmp & 7);
        put_bits(pb, 1, tmp > 7);

522 523
        if (tmp > 7)
            put_bits(pb, 5, tmp >> 3);
524 525 526 527 528
    }

    for (i = 0; i < rc->classifications; i++) {
        int j;
        for (j = 0; j < 8; j++)
529
            if (rc->books[i][j] != -1)
530 531
                put_bits(pb, 8, rc->books[i][j]);
    }
532 533
}

534
static int put_main_header(vorbis_enc_context *venc, uint8_t **out)
535
{
536
    int i;
537
    PutBitContext pb;
538
    uint8_t buffer[50000] = {0}, *p = buffer;
539 540 541 542 543 544
    int buffer_len = sizeof buffer;
    int len, hlens[3];

    // identification header
    init_put_bits(&pb, p, buffer_len);
    put_bits(&pb, 8, 1); //magic
545 546
    for (i = 0; "vorbis"[i]; i++)
        put_bits(&pb, 8, "vorbis"[i]);
547
    put_bits32(&pb, 0); // version
548
    put_bits(&pb,  8, venc->channels);
549 550 551 552
    put_bits32(&pb, venc->sample_rate);
    put_bits32(&pb, 0); // bitrate
    put_bits32(&pb, 0); // bitrate
    put_bits32(&pb, 0); // bitrate
553 554 555
    put_bits(&pb,  4, venc->log2_blocksize[0]);
    put_bits(&pb,  4, venc->log2_blocksize[1]);
    put_bits(&pb,  1, 1); // framing
556 557

    flush_put_bits(&pb);
558
    hlens[0] = put_bits_count(&pb) >> 3;
559 560 561 562 563 564
    buffer_len -= hlens[0];
    p += hlens[0];

    // comment header
    init_put_bits(&pb, p, buffer_len);
    put_bits(&pb, 8, 3); //magic
565 566
    for (i = 0; "vorbis"[i]; i++)
        put_bits(&pb, 8, "vorbis"[i]);
567 568
    put_bits32(&pb, 0); // vendor length TODO
    put_bits32(&pb, 0); // amount of comments
569
    put_bits(&pb,  1, 1); // framing
570 571

    flush_put_bits(&pb);
572
    hlens[1] = put_bits_count(&pb) >> 3;
573 574 575 576 577 578
    buffer_len -= hlens[1];
    p += hlens[1];

    // setup header
    init_put_bits(&pb, p, buffer_len);
    put_bits(&pb, 8, 5); //magic
579 580
    for (i = 0; "vorbis"[i]; i++)
        put_bits(&pb, 8, "vorbis"[i]);
581 582 583

    // codebooks
    put_bits(&pb, 8, venc->ncodebooks - 1);
584 585
    for (i = 0; i < venc->ncodebooks; i++)
        put_codebook_header(&pb, &venc->codebooks[i]);
586

587
    // time domain, reserved, zero
588
    put_bits(&pb,  6, 0);
589 590 591 592
    put_bits(&pb, 16, 0);

    // floors
    put_bits(&pb, 6, venc->nfloors - 1);
593 594
    for (i = 0; i < venc->nfloors; i++)
        put_floor_header(&pb, &venc->floors[i]);
595 596 597

    // residues
    put_bits(&pb, 6, venc->nresidues - 1);
598 599
    for (i = 0; i < venc->nresidues; i++)
        put_residue_header(&pb, &venc->residues[i]);
600 601 602 603

    // mappings
    put_bits(&pb, 6, venc->nmappings - 1);
    for (i = 0; i < venc->nmappings; i++) {
604
        vorbis_enc_mapping *mc = &venc->mappings[i];
605 606 607 608
        int j;
        put_bits(&pb, 16, 0); // mapping type

        put_bits(&pb, 1, mc->submaps > 1);
609 610
        if (mc->submaps > 1)
            put_bits(&pb, 4, mc->submaps - 1);
611

612 613 614 615 616 617 618 619
        put_bits(&pb, 1, !!mc->coupling_steps);
        if (mc->coupling_steps) {
            put_bits(&pb, 8, mc->coupling_steps - 1);
            for (j = 0; j < mc->coupling_steps; j++) {
                put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
                put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
            }
        }
620 621 622

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

623 624 625
        if (mc->submaps > 1)
            for (j = 0; j < venc->channels; j++)
                put_bits(&pb, 4, mc->mux[j]);
626 627 628 629 630 631

        for (j = 0; j < mc->submaps; j++) {
            put_bits(&pb, 8, 0); // reserved time configuration
            put_bits(&pb, 8, mc->floor[j]);
            put_bits(&pb, 8, mc->residue[j]);
        }
632
    }
633

634 635 636 637 638 639 640 641 642
    // modes
    put_bits(&pb, 6, venc->nmodes - 1);
    for (i = 0; i < venc->nmodes; i++) {
        put_bits(&pb, 1, venc->modes[i].blockflag);
        put_bits(&pb, 16, 0); // reserved window type
        put_bits(&pb, 16, 0); // reserved transform type
        put_bits(&pb, 8, venc->modes[i].mapping);
    }

643 644
    put_bits(&pb, 1, 1); // framing

645
    flush_put_bits(&pb);
646
    hlens[2] = put_bits_count(&pb) >> 3;
647 648 649 650 651 652 653 654 655 656 657 658 659

    len = hlens[0] + hlens[1] + hlens[2];
    p = *out = av_mallocz(64 + len + len/255);

    *p++ = 2;
    p += av_xiphlacing(p, hlens[0]);
    p += av_xiphlacing(p, hlens[1]);
    buffer_len = 0;
    for (i = 0; i < 3; i++) {
        memcpy(p, buffer + buffer_len, hlens[i]);
        p += hlens[i];
        buffer_len += hlens[i];
    }
660

661
    return p - *out;
662 663
}

664
static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i)
665
{
666 667 668 669 670
    int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
    int end   = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
    int j;
    float average = 0;

671 672
    for (j = begin; j < end; j++)
        average += fabs(coeffs[j]);
673 674 675
    return average / (end - begin);
}

676
static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc,
677
                      float *coeffs, uint16_t *posts, int samples)
678
{
679 680
    int range = 255 / fc->multiplier + 1;
    int i;
681
    float tot_average = 0.;
Måns Rullgård's avatar
Måns Rullgård committed
682
    float averages[MAX_FLOOR_VALUES];
683
    for (i = 0; i < fc->values; i++) {
684 685 686
        averages[i] = get_floor_average(fc, coeffs, i);
        tot_average += averages[i];
    }
687
    tot_average /= fc->values;
688
    tot_average /= venc->quality;
689

690
    for (i = 0; i < fc->values; i++) {
691
        int position  = fc->list[fc->list[i].sort].x;
692
        float average = averages[i];
693 694
        int j;

695
        average = sqrt(tot_average * average) * pow(1.25f, position*0.005f); // MAGIC!
696
        for (j = 0; j < range - 1; j++)
697 698
            if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average)
                break;
699 700 701 702
        posts[fc->list[i].sort] = j;
    }
}

703 704
static int render_point(int x0, int y0, int x1, int y1, int x)
{
705 706 707
    return y0 +  (x - x0) * (y1 - y0) / (x1 - x0);
}

708
static void floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,
709
                         PutBitContext *pb, uint16_t *posts,
710
                         float *floor, int samples)
711
{
712
    int range = 255 / fc->multiplier + 1;
Måns Rullgård's avatar
Måns Rullgård committed
713
    int coded[MAX_FLOOR_VALUES]; // first 2 values are unused
714 715
    int i, counter;

716
    put_bits(pb, 1, 1); // non zero
717 718
    put_bits(pb, ilog(range - 1), posts[0]);
    put_bits(pb, ilog(range - 1), posts[1]);
719
    coded[0] = coded[1] = 1;
720 721 722 723 724 725 726

    for (i = 2; i < fc->values; i++) {
        int predicted = render_point(fc->list[fc->list[i].low].x,
                                     posts[fc->list[i].low],
                                     fc->list[fc->list[i].high].x,
                                     posts[fc->list[i].high],
                                     fc->list[i].x);
727
        int highroom = range - predicted;
728 729 730 731 732
        int lowroom = predicted;
        int room = FFMIN(highroom, lowroom);
        if (predicted == posts[i]) {
            coded[i] = 0; // must be used later as flag!
            continue;
733
        } else {
734 735 736 737
            if (!coded[fc->list[i].low ])
                coded[fc->list[i].low ] = -1;
            if (!coded[fc->list[i].high])
                coded[fc->list[i].high] = -1;
738 739
        }
        if (posts[i] > predicted) {
740 741 742 743
            if (posts[i] - predicted > room)
                coded[i] = posts[i] - predicted + lowroom;
            else
                coded[i] = (posts[i] - predicted) << 1;
744
        } else {
745 746 747 748
            if (predicted - posts[i] > room)
                coded[i] = predicted - posts[i] + highroom - 1;
            else
                coded[i] = ((predicted - posts[i]) << 1) - 1;
749 750 751 752 753
        }
    }

    counter = 2;
    for (i = 0; i < fc->partitions; i++) {
754
        vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
755 756
        int k, cval = 0, csub = 1<<c->subclass;
        if (c->subclass) {
757
            vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
758 759 760 761 762
            int cshift = 0;
            for (k = 0; k < c->dim; k++) {
                int l;
                for (l = 0; l < csub; l++) {
                    int maxval = 1;
763 764
                    if (c->books[l] != -1)
                        maxval = venc->codebooks[c->books[l]].nentries;
Diego Biurrun's avatar
Diego Biurrun committed
765
                    // coded could be -1, but this still works, cause that is 0
766 767
                    if (coded[counter + k] < maxval)
                        break;
768 769
                }
                assert(l != csub);
770
                cval   |= l << cshift;
771 772
                cshift += c->subclass;
            }
773
            put_codeword(pb, book, cval);
774
        }
775
        for (k = 0; k < c->dim; k++) {
776
            int book  = c->books[cval & (csub-1)];
777
            int entry = coded[counter++];
778
            cval >>= c->subclass;
779 780 781 782
            if (book == -1)
                continue;
            if (entry == -1)
                entry = 0;
783
            put_codeword(pb, &venc->codebooks[book], entry);
784 785 786
        }
    }

787 788
    ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded,
                                 fc->multiplier, floor, samples);
789 790
}

791 792
static float *put_vector(vorbis_enc_codebook *book, PutBitContext *pb,
                         float *num)
793
{
794 795
    int i, entry = -1;
    float distance = FLT_MAX;
796 797
    assert(book->dimentions);
    for (i = 0; i < book->nentries; i++) {
798
        float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i];
799
        int j;
800 801
        if (!book->lens[i])
            continue;
802 803
        for (j = 0; j < book->ndimentions; j++)
            d -= vec[j] * num[j];
804
        if (distance > d) {
805
            entry    = i;
806 807 808
            distance = d;
        }
    }
809
    put_codeword(pb, book, entry);
810 811
    return &book->dimentions[entry * book->ndimentions];
}
Oded Shimon's avatar
Oded Shimon committed
812

813 814
static void residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,
                           PutBitContext *pb, float *coeffs, int samples,
815 816
                           int real_ch)
{
817
    int pass, i, j, p, k;
818
    int psize      = rc->partition_size;
819
    int partitions = (rc->end - rc->begin) / psize;
820
    int channels   = (rc->type == 2) ? 1 : real_ch;
Måns Rullgård's avatar
Måns Rullgård committed
821
    int classes[MAX_CHANNELS][NUM_RESIDUE_PARTITIONS];
822
    int classwords = venc->codebooks[rc->classbook].ndimentions;
823

824 825 826 827 828 829
    assert(rc->type == 2);
    assert(real_ch == 2);
    for (p = 0; p < partitions; p++) {
        float max1 = 0., max2 = 0.;
        int s = rc->begin + p * psize;
        for (k = s; k < s + psize; k += 2) {
830 831
            max1 = FFMAX(max1, fabs(coeffs[          k / real_ch]));
            max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
832 833
        }

834 835 836
        for (i = 0; i < rc->classifications - 1; i++)
            if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1])
                break;
837 838 839
        classes[0][p] = i;
    }

840 841 842
    for (pass = 0; pass < 8; pass++) {
        p = 0;
        while (p < partitions) {
843 844
            if (pass == 0)
                for (j = 0; j < channels; j++) {
845
                    vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
846 847 848 849 850 851
                    int entry = 0;
                    for (i = 0; i < classwords; i++) {
                        entry *= rc->classifications;
                        entry += classes[j][p + i];
                    }
                    put_codeword(pb, book, entry);
852 853 854 855
                }
            for (i = 0; i < classwords && p < partitions; i++, p++) {
                for (j = 0; j < channels; j++) {
                    int nbook = rc->books[classes[j][p]][pass];
856
                    vorbis_enc_codebook * book = &venc->codebooks[nbook];
857
                    float *buf = coeffs + samples*j + rc->begin + p*psize;
858 859
                    if (nbook == -1)
                        continue;
Oded Shimon's avatar
Oded Shimon committed
860

861
                    assert(rc->type == 0 || rc->type == 2);
862
                    assert(!(psize % book->ndimentions));
Oded Shimon's avatar
Oded Shimon committed
863

864
                    if (rc->type == 0) {
865
                        for (k = 0; k < psize; k += book->ndimentions) {
866
                            float *a = put_vector(book, pb, &buf[k]);
867
                            int l;
868 869
                            for (l = 0; l < book->ndimentions; l++)
                                buf[k + l] -= a[l];
870
                        }
871
                    } else {
872 873 874
                        int s = rc->begin + p * psize, a1, b1;
                        a1 = (s % real_ch) * samples;
                        b1 =  s / real_ch;
875
                        s  = real_ch * samples;
876
                        for (k = 0; k < psize; k += book->ndimentions) {
877
                            int dim, a2 = a1, b2 = b1;
Måns Rullgård's avatar
Måns Rullgård committed
878
                            float vec[MAX_CODEBOOK_DIM], *pv = vec;
879 880
                            for (dim = book->ndimentions; dim--; ) {
                                *pv++ = coeffs[a2 + b2];
881
                                if ((a2 += samples) == s) {
882
                                    a2 = 0;
883 884
                                    b2++;
                                }
885 886 887 888
                            }
                            pv = put_vector(book, pb, vec);
                            for (dim = book->ndimentions; dim--; ) {
                                coeffs[a1 + b1] -= *pv++;
889
                                if ((a1 += samples) == s) {
890
                                    a1 = 0;
891 892
                                    b1++;
                                }
893
                            }
894 895
                        }
                    }
896 897 898 899
                }
            }
        }
    }
Oded Shimon's avatar
Oded Shimon committed
900 901
}

902
static int apply_window_and_mdct(vorbis_enc_context *venc, const signed short *audio,
903
                                 int samples)
904
{
905 906
    int i, j, channel;
    const float * win = venc->win[0];
907 908
    int window_len = 1 << (venc->log2_blocksize[0] - 1);
    float n = (float)(1 << venc->log2_blocksize[0]) / 4.;
909 910
    // FIXME use dsp

911 912
    if (!venc->have_saved && !samples)
        return 0;
913

914
    if (venc->have_saved) {
915
        for (channel = 0; channel < venc->channels; channel++)
916 917 918
            memcpy(venc->samples + channel * window_len * 2,
                   venc->saved + channel * window_len, sizeof(float) * window_len);
    } else {
919
        for (channel = 0; channel < venc->channels; channel++)
920 921 922
            memset(venc->samples + channel * window_len * 2, 0,
                   sizeof(float) * window_len);
    }
923 924 925

    if (samples) {
        for (channel = 0; channel < venc->channels; channel++) {
926
            float * offset = venc->samples + channel*window_len*2 + window_len;
927 928
            j = channel;
            for (i = 0; i < samples; i++, j += venc->channels)
929
                offset[i] = audio[j] / 32768. / n * win[window_len - i - 1];
930 931
        }
    } else {
932
        for (channel = 0; channel < venc->channels; channel++)
933 934
            memset(venc->samples + channel * window_len * 2 + window_len,
                   0, sizeof(float) * window_len);
935 936
    }

937
    for (channel = 0; channel < venc->channels; channel++)
938
        venc->mdct[0].mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,
939
                     venc->samples + channel * window_len * 2);
940 941 942

    if (samples) {
        for (channel = 0; channel < venc->channels; channel++) {
943
            float *offset = venc->saved + channel * window_len;
944 945
            j = channel;
            for (i = 0; i < samples; i++, j += venc->channels)
946
                offset[i] = audio[j] / 32768. / n * win[i];
947 948 949 950 951 952 953
        }
        venc->have_saved = 1;
    } else {
        venc->have_saved = 0;
    }
    return 1;
}
Oded Shimon's avatar
Oded Shimon committed
954

955
static av_cold int vorbis_encode_init(AVCodecContext *avccontext)
956
{
957
    vorbis_enc_context *venc = avccontext->priv_data;
958

959
    if (avccontext->channels != 2) {
960
        av_log(avccontext, AV_LOG_ERROR, "Current Libav Vorbis encoder only supports 2 channels.\n");
961 962
        return -1;
    }
963

964
    create_vorbis_context(venc, avccontext);
965

966 967 968
    if (avccontext->flags & CODEC_FLAG_QSCALE)
        venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
    else
969
        venc->quality = 0.03;
970
    venc->quality *= venc->quality;
971

972
    avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata);
973

974
    avccontext->frame_size     = 1 << (venc->log2_blocksize[0] - 1);
975

976
    avccontext->coded_frame            = avcodec_alloc_frame();
977 978 979
    avccontext->coded_frame->key_frame = 1;

    return 0;
980 981
}

982 983 984
static int vorbis_encode_frame(AVCodecContext *avccontext,
                               unsigned char *packets,
                               int buf_size, void *data)
Oded Shimon's avatar
Oded Shimon committed
985
{
986
    vorbis_enc_context *venc = avccontext->priv_data;
987
    const signed short *audio = data;
988
    int samples = data ? avccontext->frame_size : 0;
989 990
    vorbis_enc_mode *mode;
    vorbis_enc_mapping *mapping;
991 992 993
    PutBitContext pb;
    int i;

994 995
    if (!apply_window_and_mdct(venc, audio, samples))
        return 0;
996
    samples = 1 << (venc->log2_blocksize[0] - 1);
997

998 999 1000 1001 1002 1003
    init_put_bits(&pb, packets, buf_size);

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

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

1004
    mode    = &venc->modes[0];
1005 1006 1007 1008 1009 1010 1011
    mapping = &venc->mappings[mode->mapping];
    if (mode->blockflag) {
        put_bits(&pb, 1, 0);
        put_bits(&pb, 1, 0);
    }

    for (i = 0; i < venc->channels; i++) {
1012
        vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
1013
        uint16_t posts[MAX_FLOOR_VALUES];
1014
        floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
1015
        floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples);
1016
    }
Oded Shimon's avatar
Oded Shimon committed
1017

1018
    for (i = 0; i < venc->channels * samples; i++)
1019
        venc->coeffs[i] /= venc->floor[i];
1020

1021
    for (i = 0; i < mapping->coupling_steps; i++) {
1022 1023
        float *mag = venc->coeffs + mapping->magnitude[i] * samples;
        float *ang = venc->coeffs + mapping->angle[i]     * samples;
1024 1025 1026
        int j;
        for (j = 0; j < samples; j++) {
            float a = ang[j];
1027
            ang[j] -= mag[j];
1028 1029 1030 1031
            if (mag[j] > 0)
                ang[j] = -ang[j];
            if (ang[j] < 0)
                mag[j] = a;
1032 1033 1034
        }
    }

1035 1036
    residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],
                   &pb, venc->coeffs, samples, venc->channels);
1037

1038 1039
    avccontext->coded_frame->pts = venc->sample_count;
    venc->sample_count += avccontext->frame_size;
1040
    flush_put_bits(&pb);
1041
    return put_bits_count(&pb) >> 3;
Oded Shimon's avatar
Oded Shimon committed
1042 1043 1044
}


1045
static av_cold int vorbis_encode_close(AVCodecContext *avccontext)
Oded Shimon's avatar
Oded Shimon committed
1046
{
1047
    vorbis_enc_context *venc = avccontext->priv_data;
1048 1049
    int i;

1050 1051 1052 1053 1054 1055 1056 1057
    if (venc->codebooks)
        for (i = 0; i < venc->ncodebooks; i++) {
            av_freep(&venc->codebooks[i].lens);
            av_freep(&venc->codebooks[i].codewords);
            av_freep(&venc->codebooks[i].quantlist);
            av_freep(&venc->codebooks[i].dimentions);
            av_freep(&venc->codebooks[i].pow2);
        }
1058 1059
    av_freep(&venc->codebooks);

1060 1061 1062 1063 1064 1065
    if (venc->floors)
        for (i = 0; i < venc->nfloors; i++) {
            int j;
            if (venc->floors[i].classes)
                for (j = 0; j < venc->floors[i].nclasses; j++)
                    av_freep(&venc->floors[i].classes[j].books);
1066
            av_freep(&venc->floors[i].classes);
1067 1068 1069
            av_freep(&venc->floors[i].partition_to_class);
            av_freep(&venc->floors[i].list);
        }
1070 1071
    av_freep(&venc->floors);

1072 1073 1074 1075 1076
    if (venc->residues)
        for (i = 0; i < venc->nresidues; i++) {
            av_freep(&venc->residues[i].books);
            av_freep(&venc->residues[i].maxes);
        }
1077 1078
    av_freep(&venc->residues);

1079 1080 1081 1082 1083
    if (venc->mappings)
        for (i = 0; i < venc->nmappings; i++) {
            av_freep(&venc->mappings[i].mux);
            av_freep(&venc->mappings[i].floor);
            av_freep(&venc->mappings[i].residue);
Oded Shimon's avatar
Oded Shimon committed
1084 1085
            av_freep(&venc->mappings[i].magnitude);
            av_freep(&venc->mappings[i].angle);
1086
        }
1087 1088 1089
    av_freep(&venc->mappings);

    av_freep(&venc->modes);
Oded Shimon's avatar
Oded Shimon committed
1090

1091 1092 1093 1094 1095 1096 1097 1098
    av_freep(&venc->saved);
    av_freep(&venc->samples);
    av_freep(&venc->floor);
    av_freep(&venc->coeffs);

    ff_mdct_end(&venc->mdct[0]);
    ff_mdct_end(&venc->mdct[1]);

Oded Shimon's avatar
Oded Shimon committed
1099 1100 1101 1102 1103 1104
    av_freep(&avccontext->coded_frame);
    av_freep(&avccontext->extradata);

    return 0 ;
}

1105
AVCodec ff_vorbis_encoder = {
1106 1107 1108 1109 1110 1111 1112
    .name           = "vorbis",
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = CODEC_ID_VORBIS,
    .priv_data_size = sizeof(vorbis_enc_context),
    .init           = vorbis_encode_init,
    .encode         = vorbis_encode_frame,
    .close          = vorbis_encode_close,
1113
    .capabilities= CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL,
1114
    .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
1115
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
Oded Shimon's avatar
Oded Shimon committed
1116
};