1/*
2 * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
22 * @file
23 * Native Vorbis encoder.
24 * @author Oded Shimon <ods15@ods15.dyndns.org>
25 */
26
27#include <float.h>
28
29#include "avcodec.h"
30#include "internal.h"
31#include "fft.h"
32#include "mathops.h"
33#include "vorbis.h"
34#include "vorbis_enc_data.h"
35
36#define BITSTREAM_WRITER_LE
37#include "put_bits.h"
38
39#undef NDEBUG
40#include <assert.h>
41
42typedef struct {
43    int nentries;
44    uint8_t *lens;
45    uint32_t *codewords;
46    int ndimensions;
47    float min;
48    float delta;
49    int seq_p;
50    int lookup;
51    int *quantlist;
52    float *dimensions;
53    float *pow2;
54} vorbis_enc_codebook;
55
56typedef struct {
57    int dim;
58    int subclass;
59    int masterbook;
60    int *books;
61} vorbis_enc_floor_class;
62
63typedef struct {
64    int partitions;
65    int *partition_to_class;
66    int nclasses;
67    vorbis_enc_floor_class *classes;
68    int multiplier;
69    int rangebits;
70    int values;
71    vorbis_floor1_entry *list;
72} vorbis_enc_floor;
73
74typedef struct {
75    int type;
76    int begin;
77    int end;
78    int partition_size;
79    int classifications;
80    int classbook;
81    int8_t (*books)[8];
82    float (*maxes)[2];
83} vorbis_enc_residue;
84
85typedef struct {
86    int submaps;
87    int *mux;
88    int *floor;
89    int *residue;
90    int coupling_steps;
91    int *magnitude;
92    int *angle;
93} vorbis_enc_mapping;
94
95typedef struct {
96    int blockflag;
97    int mapping;
98} vorbis_enc_mode;
99
100typedef struct {
101    int channels;
102    int sample_rate;
103    int log2_blocksize[2];
104    FFTContext mdct[2];
105    const float *win[2];
106    int have_saved;
107    float *saved;
108    float *samples;
109    float *floor;  // also used for tmp values for mdct
110    float *coeffs; // also used for residue after floor
111    float quality;
112
113    int ncodebooks;
114    vorbis_enc_codebook *codebooks;
115
116    int nfloors;
117    vorbis_enc_floor *floors;
118
119    int nresidues;
120    vorbis_enc_residue *residues;
121
122    int nmappings;
123    vorbis_enc_mapping *mappings;
124
125    int nmodes;
126    vorbis_enc_mode *modes;
127
128    int64_t next_pts;
129} vorbis_enc_context;
130
131#define MAX_CHANNELS     2
132#define MAX_CODEBOOK_DIM 8
133
134#define MAX_FLOOR_CLASS_DIM  4
135#define NUM_FLOOR_PARTITIONS 8
136#define MAX_FLOOR_VALUES     (MAX_FLOOR_CLASS_DIM*NUM_FLOOR_PARTITIONS+2)
137
138#define RESIDUE_SIZE           1600
139#define RESIDUE_PART_SIZE      32
140#define NUM_RESIDUE_PARTITIONS (RESIDUE_SIZE/RESIDUE_PART_SIZE)
141
142static inline int put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb,
143                               int entry)
144{
145    av_assert2(entry >= 0);
146    av_assert2(entry < cb->nentries);
147    av_assert2(cb->lens[entry]);
148    if (pb->size_in_bits - put_bits_count(pb) < cb->lens[entry])
149        return AVERROR(EINVAL);
150    put_bits(pb, cb->lens[entry], cb->codewords[entry]);
151    return 0;
152}
153
154static int cb_lookup_vals(int lookup, int dimensions, int entries)
155{
156    if (lookup == 1)
157        return ff_vorbis_nth_root(entries, dimensions);
158    else if (lookup == 2)
159        return dimensions *entries;
160    return 0;
161}
162
163static int ready_codebook(vorbis_enc_codebook *cb)
164{
165    int i;
166
167    ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
168
169    if (!cb->lookup) {
170        cb->pow2 = cb->dimensions = NULL;
171    } else {
172        int vals = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
173        cb->dimensions = av_malloc(sizeof(float) * cb->nentries * cb->ndimensions);
174        cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
175        if (!cb->dimensions || !cb->pow2)
176            return AVERROR(ENOMEM);
177        for (i = 0; i < cb->nentries; i++) {
178            float last = 0;
179            int j;
180            int div = 1;
181            for (j = 0; j < cb->ndimensions; j++) {
182                int off;
183                if (cb->lookup == 1)
184                    off = (i / div) % vals; // lookup type 1
185                else
186                    off = i * cb->ndimensions + j; // lookup type 2
187
188                cb->dimensions[i * cb->ndimensions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
189                if (cb->seq_p)
190                    last = cb->dimensions[i * cb->ndimensions + j];
191                cb->pow2[i] += cb->dimensions[i * cb->ndimensions + j] * cb->dimensions[i * cb->ndimensions + j];
192                div *= vals;
193            }
194            cb->pow2[i] /= 2.0;
195        }
196    }
197    return 0;
198}
199
200static int ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc)
201{
202    int i;
203    av_assert0(rc->type == 2);
204    rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
205    if (!rc->maxes)
206        return AVERROR(ENOMEM);
207    for (i = 0; i < rc->classifications; i++) {
208        int j;
209        vorbis_enc_codebook * cb;
210        for (j = 0; j < 8; j++)
211            if (rc->books[i][j] != -1)
212                break;
213        if (j == 8) // zero
214            continue;
215        cb = &venc->codebooks[rc->books[i][j]];
216        assert(cb->ndimensions >= 2);
217        assert(cb->lookup);
218
219        for (j = 0; j < cb->nentries; j++) {
220            float a;
221            if (!cb->lens[j])
222                continue;
223            a = fabs(cb->dimensions[j * cb->ndimensions]);
224            if (a > rc->maxes[i][0])
225                rc->maxes[i][0] = a;
226            a = fabs(cb->dimensions[j * cb->ndimensions + 1]);
227            if (a > rc->maxes[i][1])
228                rc->maxes[i][1] = a;
229        }
230    }
231    // small bias
232    for (i = 0; i < rc->classifications; i++) {
233        rc->maxes[i][0] += 0.8;
234        rc->maxes[i][1] += 0.8;
235    }
236    return 0;
237}
238
239static int create_vorbis_context(vorbis_enc_context *venc,
240                                 AVCodecContext *avctx)
241{
242    vorbis_enc_floor   *fc;
243    vorbis_enc_residue *rc;
244    vorbis_enc_mapping *mc;
245    int i, book, ret;
246
247    venc->channels    = avctx->channels;
248    venc->sample_rate = avctx->sample_rate;
249    venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
250
251    venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);
252    venc->codebooks  = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
253    if (!venc->codebooks)
254        return AVERROR(ENOMEM);
255
256    // codebook 0..14 - floor1 book, values 0..255
257    // codebook 15 residue masterbook
258    // codebook 16..29 residue
259    for (book = 0; book < venc->ncodebooks; book++) {
260        vorbis_enc_codebook *cb = &venc->codebooks[book];
261        int vals;
262        cb->ndimensions = cvectors[book].dim;
263        cb->nentries    = cvectors[book].real_len;
264        cb->min         = cvectors[book].min;
265        cb->delta       = cvectors[book].delta;
266        cb->lookup      = cvectors[book].lookup;
267        cb->seq_p       = 0;
268
269        cb->lens      = av_malloc(sizeof(uint8_t)  * cb->nentries);
270        cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
271        if (!cb->lens || !cb->codewords)
272            return AVERROR(ENOMEM);
273        memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
274        memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
275
276        if (cb->lookup) {
277            vals = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
278            cb->quantlist = av_malloc(sizeof(int) * vals);
279            if (!cb->quantlist)
280                return AVERROR(ENOMEM);
281            for (i = 0; i < vals; i++)
282                cb->quantlist[i] = cvectors[book].quant[i];
283        } else {
284            cb->quantlist = NULL;
285        }
286        if ((ret = ready_codebook(cb)) < 0)
287            return ret;
288    }
289
290    venc->nfloors = 1;
291    venc->floors  = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);
292    if (!venc->floors)
293        return AVERROR(ENOMEM);
294
295    // just 1 floor
296    fc = &venc->floors[0];
297    fc->partitions         = NUM_FLOOR_PARTITIONS;
298    fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
299    if (!fc->partition_to_class)
300        return AVERROR(ENOMEM);
301    fc->nclasses           = 0;
302    for (i = 0; i < fc->partitions; i++) {
303        static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4};
304        fc->partition_to_class[i] = a[i];
305        fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
306    }
307    fc->nclasses++;
308    fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses);
309    if (!fc->classes)
310        return AVERROR(ENOMEM);
311    for (i = 0; i < fc->nclasses; i++) {
312        vorbis_enc_floor_class * c = &fc->classes[i];
313        int j, books;
314        c->dim        = floor_classes[i].dim;
315        c->subclass   = floor_classes[i].subclass;
316        c->masterbook = floor_classes[i].masterbook;
317        books         = (1 << c->subclass);
318        c->books      = av_malloc(sizeof(int) * books);
319        if (!c->books)
320            return AVERROR(ENOMEM);
321        for (j = 0; j < books; j++)
322            c->books[j] = floor_classes[i].nbooks[j];
323    }
324    fc->multiplier = 2;
325    fc->rangebits  = venc->log2_blocksize[0] - 1;
326
327    fc->values = 2;
328    for (i = 0; i < fc->partitions; i++)
329        fc->values += fc->classes[fc->partition_to_class[i]].dim;
330
331    fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);
332    if (!fc->list)
333        return AVERROR(ENOMEM);
334    fc->list[0].x = 0;
335    fc->list[1].x = 1 << fc->rangebits;
336    for (i = 2; i < fc->values; i++) {
337        static const int a[] = {
338             93, 23,372,  6, 46,186,750, 14, 33, 65,
339            130,260,556,  3, 10, 18, 28, 39, 55, 79,
340            111,158,220,312,464,650,850
341        };
342        fc->list[i].x = a[i - 2];
343    }
344    if (ff_vorbis_ready_floor1_list(avctx, fc->list, fc->values))
345        return AVERROR_BUG;
346
347    venc->nresidues = 1;
348    venc->residues  = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
349    if (!venc->residues)
350        return AVERROR(ENOMEM);
351
352    // single residue
353    rc = &venc->residues[0];
354    rc->type            = 2;
355    rc->begin           = 0;
356    rc->end             = 1600;
357    rc->partition_size  = 32;
358    rc->classifications = 10;
359    rc->classbook       = 15;
360    rc->books           = av_malloc(sizeof(*rc->books) * rc->classifications);
361    if (!rc->books)
362        return AVERROR(ENOMEM);
363    {
364        static const int8_t a[10][8] = {
365            { -1, -1, -1, -1, -1, -1, -1, -1, },
366            { -1, -1, 16, -1, -1, -1, -1, -1, },
367            { -1, -1, 17, -1, -1, -1, -1, -1, },
368            { -1, -1, 18, -1, -1, -1, -1, -1, },
369            { -1, -1, 19, -1, -1, -1, -1, -1, },
370            { -1, -1, 20, -1, -1, -1, -1, -1, },
371            { -1, -1, 21, -1, -1, -1, -1, -1, },
372            { 22, 23, -1, -1, -1, -1, -1, -1, },
373            { 24, 25, -1, -1, -1, -1, -1, -1, },
374            { 26, 27, 28, -1, -1, -1, -1, -1, },
375        };
376        memcpy(rc->books, a, sizeof a);
377    }
378    if ((ret = ready_residue(rc, venc)) < 0)
379        return ret;
380
381    venc->nmappings = 1;
382    venc->mappings  = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
383    if (!venc->mappings)
384        return AVERROR(ENOMEM);
385
386    // single mapping
387    mc = &venc->mappings[0];
388    mc->submaps = 1;
389    mc->mux     = av_malloc(sizeof(int) * venc->channels);
390    if (!mc->mux)
391        return AVERROR(ENOMEM);
392    for (i = 0; i < venc->channels; i++)
393        mc->mux[i] = 0;
394    mc->floor   = av_malloc(sizeof(int) * mc->submaps);
395    mc->residue = av_malloc(sizeof(int) * mc->submaps);
396    if (!mc->floor || !mc->residue)
397        return AVERROR(ENOMEM);
398    for (i = 0; i < mc->submaps; i++) {
399        mc->floor[i]   = 0;
400        mc->residue[i] = 0;
401    }
402    mc->coupling_steps = venc->channels == 2 ? 1 : 0;
403    mc->magnitude      = av_malloc(sizeof(int) * mc->coupling_steps);
404    mc->angle          = av_malloc(sizeof(int) * mc->coupling_steps);
405    if (!mc->magnitude || !mc->angle)
406        return AVERROR(ENOMEM);
407    if (mc->coupling_steps) {
408        mc->magnitude[0] = 0;
409        mc->angle[0]     = 1;
410    }
411
412    venc->nmodes = 1;
413    venc->modes  = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
414    if (!venc->modes)
415        return AVERROR(ENOMEM);
416
417    // single mode
418    venc->modes[0].blockflag = 0;
419    venc->modes[0].mapping   = 0;
420
421    venc->have_saved = 0;
422    venc->saved      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
423    venc->samples    = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
424    venc->floor      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
425    venc->coeffs     = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
426    if (!venc->saved || !venc->samples || !venc->floor || !venc->coeffs)
427        return AVERROR(ENOMEM);
428
429    venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
430    venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
431
432    if ((ret = ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0)) < 0)
433        return ret;
434    if ((ret = ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0)) < 0)
435        return ret;
436
437    return 0;
438}
439
440static void put_float(PutBitContext *pb, float f)
441{
442    int exp, mant;
443    uint32_t res = 0;
444    mant = (int)ldexp(frexp(f, &exp), 20);
445    exp += 788 - 20;
446    if (mant < 0) {
447        res |= (1U << 31);
448        mant = -mant;
449    }
450    res |= mant | (exp << 21);
451    put_bits32(pb, res);
452}
453
454static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb)
455{
456    int i;
457    int ordered = 0;
458
459    put_bits(pb, 24, 0x564342); //magic
460    put_bits(pb, 16, cb->ndimensions);
461    put_bits(pb, 24, cb->nentries);
462
463    for (i = 1; i < cb->nentries; i++)
464        if (cb->lens[i] < cb->lens[i-1])
465            break;
466    if (i == cb->nentries)
467        ordered = 1;
468
469    put_bits(pb, 1, ordered);
470    if (ordered) {
471        int len = cb->lens[0];
472        put_bits(pb, 5, len - 1);
473        i = 0;
474        while (i < cb->nentries) {
475            int j;
476            for (j = 0; j+i < cb->nentries; j++)
477                if (cb->lens[j+i] != len)
478                    break;
479            put_bits(pb, ilog(cb->nentries - i), j);
480            i += j;
481            len++;
482        }
483    } else {
484        int sparse = 0;
485        for (i = 0; i < cb->nentries; i++)
486            if (!cb->lens[i])
487                break;
488        if (i != cb->nentries)
489            sparse = 1;
490        put_bits(pb, 1, sparse);
491
492        for (i = 0; i < cb->nentries; i++) {
493            if (sparse)
494                put_bits(pb, 1, !!cb->lens[i]);
495            if (cb->lens[i])
496                put_bits(pb, 5, cb->lens[i] - 1);
497        }
498    }
499
500    put_bits(pb, 4, cb->lookup);
501    if (cb->lookup) {
502        int tmp  = cb_lookup_vals(cb->lookup, cb->ndimensions, cb->nentries);
503        int bits = ilog(cb->quantlist[0]);
504
505        for (i = 1; i < tmp; i++)
506            bits = FFMAX(bits, ilog(cb->quantlist[i]));
507
508        put_float(pb, cb->min);
509        put_float(pb, cb->delta);
510
511        put_bits(pb, 4, bits - 1);
512        put_bits(pb, 1, cb->seq_p);
513
514        for (i = 0; i < tmp; i++)
515            put_bits(pb, bits, cb->quantlist[i]);
516    }
517}
518
519static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc)
520{
521    int i;
522
523    put_bits(pb, 16, 1); // type, only floor1 is supported
524
525    put_bits(pb, 5, fc->partitions);
526
527    for (i = 0; i < fc->partitions; i++)
528        put_bits(pb, 4, fc->partition_to_class[i]);
529
530    for (i = 0; i < fc->nclasses; i++) {
531        int j, books;
532
533        put_bits(pb, 3, fc->classes[i].dim - 1);
534        put_bits(pb, 2, fc->classes[i].subclass);
535
536        if (fc->classes[i].subclass)
537            put_bits(pb, 8, fc->classes[i].masterbook);
538
539        books = (1 << fc->classes[i].subclass);
540
541        for (j = 0; j < books; j++)
542            put_bits(pb, 8, fc->classes[i].books[j] + 1);
543    }
544
545    put_bits(pb, 2, fc->multiplier - 1);
546    put_bits(pb, 4, fc->rangebits);
547
548    for (i = 2; i < fc->values; i++)
549        put_bits(pb, fc->rangebits, fc->list[i].x);
550}
551
552static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *rc)
553{
554    int i;
555
556    put_bits(pb, 16, rc->type);
557
558    put_bits(pb, 24, rc->begin);
559    put_bits(pb, 24, rc->end);
560    put_bits(pb, 24, rc->partition_size - 1);
561    put_bits(pb, 6, rc->classifications - 1);
562    put_bits(pb, 8, rc->classbook);
563
564    for (i = 0; i < rc->classifications; i++) {
565        int j, tmp = 0;
566        for (j = 0; j < 8; j++)
567            tmp |= (rc->books[i][j] != -1) << j;
568
569        put_bits(pb, 3, tmp & 7);
570        put_bits(pb, 1, tmp > 7);
571
572        if (tmp > 7)
573            put_bits(pb, 5, tmp >> 3);
574    }
575
576    for (i = 0; i < rc->classifications; i++) {
577        int j;
578        for (j = 0; j < 8; j++)
579            if (rc->books[i][j] != -1)
580                put_bits(pb, 8, rc->books[i][j]);
581    }
582}
583
584static int put_main_header(vorbis_enc_context *venc, uint8_t **out)
585{
586    int i;
587    PutBitContext pb;
588    uint8_t buffer[50000] = {0}, *p = buffer;
589    int buffer_len = sizeof buffer;
590    int len, hlens[3];
591
592    // identification header
593    init_put_bits(&pb, p, buffer_len);
594    put_bits(&pb, 8, 1); //magic
595    for (i = 0; "vorbis"[i]; i++)
596        put_bits(&pb, 8, "vorbis"[i]);
597    put_bits32(&pb, 0); // version
598    put_bits(&pb,  8, venc->channels);
599    put_bits32(&pb, venc->sample_rate);
600    put_bits32(&pb, 0); // bitrate
601    put_bits32(&pb, 0); // bitrate
602    put_bits32(&pb, 0); // bitrate
603    put_bits(&pb,  4, venc->log2_blocksize[0]);
604    put_bits(&pb,  4, venc->log2_blocksize[1]);
605    put_bits(&pb,  1, 1); // framing
606
607    flush_put_bits(&pb);
608    hlens[0] = put_bits_count(&pb) >> 3;
609    buffer_len -= hlens[0];
610    p += hlens[0];
611
612    // comment header
613    init_put_bits(&pb, p, buffer_len);
614    put_bits(&pb, 8, 3); //magic
615    for (i = 0; "vorbis"[i]; i++)
616        put_bits(&pb, 8, "vorbis"[i]);
617    put_bits32(&pb, 0); // vendor length TODO
618    put_bits32(&pb, 0); // amount of comments
619    put_bits(&pb,  1, 1); // framing
620
621    flush_put_bits(&pb);
622    hlens[1] = put_bits_count(&pb) >> 3;
623    buffer_len -= hlens[1];
624    p += hlens[1];
625
626    // setup header
627    init_put_bits(&pb, p, buffer_len);
628    put_bits(&pb, 8, 5); //magic
629    for (i = 0; "vorbis"[i]; i++)
630        put_bits(&pb, 8, "vorbis"[i]);
631
632    // codebooks
633    put_bits(&pb, 8, venc->ncodebooks - 1);
634    for (i = 0; i < venc->ncodebooks; i++)
635        put_codebook_header(&pb, &venc->codebooks[i]);
636
637    // time domain, reserved, zero
638    put_bits(&pb,  6, 0);
639    put_bits(&pb, 16, 0);
640
641    // floors
642    put_bits(&pb, 6, venc->nfloors - 1);
643    for (i = 0; i < venc->nfloors; i++)
644        put_floor_header(&pb, &venc->floors[i]);
645
646    // residues
647    put_bits(&pb, 6, venc->nresidues - 1);
648    for (i = 0; i < venc->nresidues; i++)
649        put_residue_header(&pb, &venc->residues[i]);
650
651    // mappings
652    put_bits(&pb, 6, venc->nmappings - 1);
653    for (i = 0; i < venc->nmappings; i++) {
654        vorbis_enc_mapping *mc = &venc->mappings[i];
655        int j;
656        put_bits(&pb, 16, 0); // mapping type
657
658        put_bits(&pb, 1, mc->submaps > 1);
659        if (mc->submaps > 1)
660            put_bits(&pb, 4, mc->submaps - 1);
661
662        put_bits(&pb, 1, !!mc->coupling_steps);
663        if (mc->coupling_steps) {
664            put_bits(&pb, 8, mc->coupling_steps - 1);
665            for (j = 0; j < mc->coupling_steps; j++) {
666                put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
667                put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
668            }
669        }
670
671        put_bits(&pb, 2, 0); // reserved
672
673        if (mc->submaps > 1)
674            for (j = 0; j < venc->channels; j++)
675                put_bits(&pb, 4, mc->mux[j]);
676
677        for (j = 0; j < mc->submaps; j++) {
678            put_bits(&pb, 8, 0); // reserved time configuration
679            put_bits(&pb, 8, mc->floor[j]);
680            put_bits(&pb, 8, mc->residue[j]);
681        }
682    }
683
684    // modes
685    put_bits(&pb, 6, venc->nmodes - 1);
686    for (i = 0; i < venc->nmodes; i++) {
687        put_bits(&pb, 1, venc->modes[i].blockflag);
688        put_bits(&pb, 16, 0); // reserved window type
689        put_bits(&pb, 16, 0); // reserved transform type
690        put_bits(&pb, 8, venc->modes[i].mapping);
691    }
692
693    put_bits(&pb, 1, 1); // framing
694
695    flush_put_bits(&pb);
696    hlens[2] = put_bits_count(&pb) >> 3;
697
698    len = hlens[0] + hlens[1] + hlens[2];
699    p = *out = av_mallocz(64 + len + len/255);
700    if (!p)
701        return AVERROR(ENOMEM);
702
703    *p++ = 2;
704    p += av_xiphlacing(p, hlens[0]);
705    p += av_xiphlacing(p, hlens[1]);
706    buffer_len = 0;
707    for (i = 0; i < 3; i++) {
708        memcpy(p, buffer + buffer_len, hlens[i]);
709        p += hlens[i];
710        buffer_len += hlens[i];
711    }
712
713    return p - *out;
714}
715
716static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i)
717{
718    int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
719    int end   = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
720    int j;
721    float average = 0;
722
723    for (j = begin; j < end; j++)
724        average += fabs(coeffs[j]);
725    return average / (end - begin);
726}
727
728static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc,
729                      float *coeffs, uint16_t *posts, int samples)
730{
731    int range = 255 / fc->multiplier + 1;
732    int i;
733    float tot_average = 0.0;
734    float averages[MAX_FLOOR_VALUES];
735    for (i = 0; i < fc->values; i++) {
736        averages[i] = get_floor_average(fc, coeffs, i);
737        tot_average += averages[i];
738    }
739    tot_average /= fc->values;
740    tot_average /= venc->quality;
741
742    for (i = 0; i < fc->values; i++) {
743        int position  = fc->list[fc->list[i].sort].x;
744        float average = averages[i];
745        int j;
746
747        average = sqrt(tot_average * average) * pow(1.25f, position*0.005f); // MAGIC!
748        for (j = 0; j < range - 1; j++)
749            if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average)
750                break;
751        posts[fc->list[i].sort] = j;
752    }
753}
754
755static int render_point(int x0, int y0, int x1, int y1, int x)
756{
757    return y0 +  (x - x0) * (y1 - y0) / (x1 - x0);
758}
759
760static int floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,
761                        PutBitContext *pb, uint16_t *posts,
762                        float *floor, int samples)
763{
764    int range = 255 / fc->multiplier + 1;
765    int coded[MAX_FLOOR_VALUES]; // first 2 values are unused
766    int i, counter;
767
768    if (pb->size_in_bits - put_bits_count(pb) < 1 + 2 * ilog(range - 1))
769        return AVERROR(EINVAL);
770    put_bits(pb, 1, 1); // non zero
771    put_bits(pb, ilog(range - 1), posts[0]);
772    put_bits(pb, ilog(range - 1), posts[1]);
773    coded[0] = coded[1] = 1;
774
775    for (i = 2; i < fc->values; i++) {
776        int predicted = render_point(fc->list[fc->list[i].low].x,
777                                     posts[fc->list[i].low],
778                                     fc->list[fc->list[i].high].x,
779                                     posts[fc->list[i].high],
780                                     fc->list[i].x);
781        int highroom = range - predicted;
782        int lowroom = predicted;
783        int room = FFMIN(highroom, lowroom);
784        if (predicted == posts[i]) {
785            coded[i] = 0; // must be used later as flag!
786            continue;
787        } else {
788            if (!coded[fc->list[i].low ])
789                coded[fc->list[i].low ] = -1;
790            if (!coded[fc->list[i].high])
791                coded[fc->list[i].high] = -1;
792        }
793        if (posts[i] > predicted) {
794            if (posts[i] - predicted > room)
795                coded[i] = posts[i] - predicted + lowroom;
796            else
797                coded[i] = (posts[i] - predicted) << 1;
798        } else {
799            if (predicted - posts[i] > room)
800                coded[i] = predicted - posts[i] + highroom - 1;
801            else
802                coded[i] = ((predicted - posts[i]) << 1) - 1;
803        }
804    }
805
806    counter = 2;
807    for (i = 0; i < fc->partitions; i++) {
808        vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
809        int k, cval = 0, csub = 1<<c->subclass;
810        if (c->subclass) {
811            vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
812            int cshift = 0;
813            for (k = 0; k < c->dim; k++) {
814                int l;
815                for (l = 0; l < csub; l++) {
816                    int maxval = 1;
817                    if (c->books[l] != -1)
818                        maxval = venc->codebooks[c->books[l]].nentries;
819                    // coded could be -1, but this still works, cause that is 0
820                    if (coded[counter + k] < maxval)
821                        break;
822                }
823                assert(l != csub);
824                cval   |= l << cshift;
825                cshift += c->subclass;
826            }
827            if (put_codeword(pb, book, cval))
828                return AVERROR(EINVAL);
829        }
830        for (k = 0; k < c->dim; k++) {
831            int book  = c->books[cval & (csub-1)];
832            int entry = coded[counter++];
833            cval >>= c->subclass;
834            if (book == -1)
835                continue;
836            if (entry == -1)
837                entry = 0;
838            if (put_codeword(pb, &venc->codebooks[book], entry))
839                return AVERROR(EINVAL);
840        }
841    }
842
843    ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded,
844                                 fc->multiplier, floor, samples);
845
846    return 0;
847}
848
849static float *put_vector(vorbis_enc_codebook *book, PutBitContext *pb,
850                         float *num)
851{
852    int i, entry = -1;
853    float distance = FLT_MAX;
854    assert(book->dimensions);
855    for (i = 0; i < book->nentries; i++) {
856        float * vec = book->dimensions + i * book->ndimensions, d = book->pow2[i];
857        int j;
858        if (!book->lens[i])
859            continue;
860        for (j = 0; j < book->ndimensions; j++)
861            d -= vec[j] * num[j];
862        if (distance > d) {
863            entry    = i;
864            distance = d;
865        }
866    }
867    if (put_codeword(pb, book, entry))
868        return NULL;
869    return &book->dimensions[entry * book->ndimensions];
870}
871
872static int residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,
873                          PutBitContext *pb, float *coeffs, int samples,
874                          int real_ch)
875{
876    int pass, i, j, p, k;
877    int psize      = rc->partition_size;
878    int partitions = (rc->end - rc->begin) / psize;
879    int channels   = (rc->type == 2) ? 1 : real_ch;
880    int classes[MAX_CHANNELS][NUM_RESIDUE_PARTITIONS];
881    int classwords = venc->codebooks[rc->classbook].ndimensions;
882
883    av_assert0(rc->type == 2);
884    av_assert0(real_ch == 2);
885    for (p = 0; p < partitions; p++) {
886        float max1 = 0.0, max2 = 0.0;
887        int s = rc->begin + p * psize;
888        for (k = s; k < s + psize; k += 2) {
889            max1 = FFMAX(max1, fabs(coeffs[          k / real_ch]));
890            max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
891        }
892
893        for (i = 0; i < rc->classifications - 1; i++)
894            if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1])
895                break;
896        classes[0][p] = i;
897    }
898
899    for (pass = 0; pass < 8; pass++) {
900        p = 0;
901        while (p < partitions) {
902            if (pass == 0)
903                for (j = 0; j < channels; j++) {
904                    vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
905                    int entry = 0;
906                    for (i = 0; i < classwords; i++) {
907                        entry *= rc->classifications;
908                        entry += classes[j][p + i];
909                    }
910                    if (put_codeword(pb, book, entry))
911                        return AVERROR(EINVAL);
912                }
913            for (i = 0; i < classwords && p < partitions; i++, p++) {
914                for (j = 0; j < channels; j++) {
915                    int nbook = rc->books[classes[j][p]][pass];
916                    vorbis_enc_codebook * book = &venc->codebooks[nbook];
917                    float *buf = coeffs + samples*j + rc->begin + p*psize;
918                    if (nbook == -1)
919                        continue;
920
921                    assert(rc->type == 0 || rc->type == 2);
922                    assert(!(psize % book->ndimensions));
923
924                    if (rc->type == 0) {
925                        for (k = 0; k < psize; k += book->ndimensions) {
926                            int l;
927                            float *a = put_vector(book, pb, &buf[k]);
928                            if (!a)
929                                return AVERROR(EINVAL);
930                            for (l = 0; l < book->ndimensions; l++)
931                                buf[k + l] -= a[l];
932                        }
933                    } else {
934                        int s = rc->begin + p * psize, a1, b1;
935                        a1 = (s % real_ch) * samples;
936                        b1 =  s / real_ch;
937                        s  = real_ch * samples;
938                        for (k = 0; k < psize; k += book->ndimensions) {
939                            int dim, a2 = a1, b2 = b1;
940                            float vec[MAX_CODEBOOK_DIM], *pv = vec;
941                            for (dim = book->ndimensions; dim--; ) {
942                                *pv++ = coeffs[a2 + b2];
943                                if ((a2 += samples) == s) {
944                                    a2 = 0;
945                                    b2++;
946                                }
947                            }
948                            pv = put_vector(book, pb, vec);
949                            if (!pv)
950                                return AVERROR(EINVAL);
951                            for (dim = book->ndimensions; dim--; ) {
952                                coeffs[a1 + b1] -= *pv++;
953                                if ((a1 += samples) == s) {
954                                    a1 = 0;
955                                    b1++;
956                                }
957                            }
958                        }
959                    }
960                }
961            }
962        }
963    }
964    return 0;
965}
966
967static int apply_window_and_mdct(vorbis_enc_context *venc,
968                                 float **audio, int samples)
969{
970    int i, channel;
971    const float * win = venc->win[0];
972    int window_len = 1 << (venc->log2_blocksize[0] - 1);
973    float n = (float)(1 << venc->log2_blocksize[0]) / 4.0;
974    // FIXME use dsp
975
976    if (!venc->have_saved && !samples)
977        return 0;
978
979    if (venc->have_saved) {
980        for (channel = 0; channel < venc->channels; channel++)
981            memcpy(venc->samples + channel * window_len * 2,
982                   venc->saved + channel * window_len, sizeof(float) * window_len);
983    } else {
984        for (channel = 0; channel < venc->channels; channel++)
985            memset(venc->samples + channel * window_len * 2, 0,
986                   sizeof(float) * window_len);
987    }
988
989    if (samples) {
990        for (channel = 0; channel < venc->channels; channel++) {
991            float * offset = venc->samples + channel*window_len*2 + window_len;
992            for (i = 0; i < samples; i++)
993                offset[i] = audio[channel][i] / n * win[window_len - i - 1];
994        }
995    } else {
996        for (channel = 0; channel < venc->channels; channel++)
997            memset(venc->samples + channel * window_len * 2 + window_len,
998                   0, sizeof(float) * window_len);
999    }
1000
1001    for (channel = 0; channel < venc->channels; channel++)
1002        venc->mdct[0].mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,
1003                     venc->samples + channel * window_len * 2);
1004
1005    if (samples) {
1006        for (channel = 0; channel < venc->channels; channel++) {
1007            float *offset = venc->saved + channel * window_len;
1008            for (i = 0; i < samples; i++)
1009                offset[i] = audio[channel][i] / n * win[i];
1010        }
1011        venc->have_saved = 1;
1012    } else {
1013        venc->have_saved = 0;
1014    }
1015    return 1;
1016}
1017
1018static int vorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
1019                               const AVFrame *frame, int *got_packet_ptr)
1020{
1021    vorbis_enc_context *venc = avctx->priv_data;
1022    float **audio = frame ? (float **)frame->extended_data : NULL;
1023    int samples = frame ? frame->nb_samples : 0;
1024    vorbis_enc_mode *mode;
1025    vorbis_enc_mapping *mapping;
1026    PutBitContext pb;
1027    int i, ret;
1028
1029    if (!apply_window_and_mdct(venc, audio, samples))
1030        return 0;
1031    samples = 1 << (venc->log2_blocksize[0] - 1);
1032
1033    if ((ret = ff_alloc_packet2(avctx, avpkt, 8192)) < 0)
1034        return ret;
1035
1036    init_put_bits(&pb, avpkt->data, avpkt->size);
1037
1038    if (pb.size_in_bits - put_bits_count(&pb) < 1 + ilog(venc->nmodes - 1)) {
1039        av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
1040        return AVERROR(EINVAL);
1041    }
1042
1043    put_bits(&pb, 1, 0); // magic bit
1044
1045    put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
1046
1047    mode    = &venc->modes[0];
1048    mapping = &venc->mappings[mode->mapping];
1049    if (mode->blockflag) {
1050        put_bits(&pb, 1, 0);
1051        put_bits(&pb, 1, 0);
1052    }
1053
1054    for (i = 0; i < venc->channels; i++) {
1055        vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
1056        uint16_t posts[MAX_FLOOR_VALUES];
1057        floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
1058        if (floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples)) {
1059            av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
1060            return AVERROR(EINVAL);
1061        }
1062    }
1063
1064    for (i = 0; i < venc->channels * samples; i++)
1065        venc->coeffs[i] /= venc->floor[i];
1066
1067    for (i = 0; i < mapping->coupling_steps; i++) {
1068        float *mag = venc->coeffs + mapping->magnitude[i] * samples;
1069        float *ang = venc->coeffs + mapping->angle[i]     * samples;
1070        int j;
1071        for (j = 0; j < samples; j++) {
1072            float a = ang[j];
1073            ang[j] -= mag[j];
1074            if (mag[j] > 0)
1075                ang[j] = -ang[j];
1076            if (ang[j] < 0)
1077                mag[j] = a;
1078        }
1079    }
1080
1081    if (residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],
1082                       &pb, venc->coeffs, samples, venc->channels)) {
1083        av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
1084        return AVERROR(EINVAL);
1085    }
1086
1087    flush_put_bits(&pb);
1088    avpkt->size = put_bits_count(&pb) >> 3;
1089
1090    avpkt->duration = ff_samples_to_time_base(avctx, avctx->frame_size);
1091    if (frame) {
1092        if (frame->pts != AV_NOPTS_VALUE)
1093            avpkt->pts = ff_samples_to_time_base(avctx, frame->pts);
1094    } else
1095        avpkt->pts = venc->next_pts;
1096    if (avpkt->pts != AV_NOPTS_VALUE)
1097        venc->next_pts = avpkt->pts + avpkt->duration;
1098
1099    *got_packet_ptr = 1;
1100    return 0;
1101}
1102
1103
1104static av_cold int vorbis_encode_close(AVCodecContext *avctx)
1105{
1106    vorbis_enc_context *venc = avctx->priv_data;
1107    int i;
1108
1109    if (venc->codebooks)
1110        for (i = 0; i < venc->ncodebooks; i++) {
1111            av_freep(&venc->codebooks[i].lens);
1112            av_freep(&venc->codebooks[i].codewords);
1113            av_freep(&venc->codebooks[i].quantlist);
1114            av_freep(&venc->codebooks[i].dimensions);
1115            av_freep(&venc->codebooks[i].pow2);
1116        }
1117    av_freep(&venc->codebooks);
1118
1119    if (venc->floors)
1120        for (i = 0; i < venc->nfloors; i++) {
1121            int j;
1122            if (venc->floors[i].classes)
1123                for (j = 0; j < venc->floors[i].nclasses; j++)
1124                    av_freep(&venc->floors[i].classes[j].books);
1125            av_freep(&venc->floors[i].classes);
1126            av_freep(&venc->floors[i].partition_to_class);
1127            av_freep(&venc->floors[i].list);
1128        }
1129    av_freep(&venc->floors);
1130
1131    if (venc->residues)
1132        for (i = 0; i < venc->nresidues; i++) {
1133            av_freep(&venc->residues[i].books);
1134            av_freep(&venc->residues[i].maxes);
1135        }
1136    av_freep(&venc->residues);
1137
1138    if (venc->mappings)
1139        for (i = 0; i < venc->nmappings; i++) {
1140            av_freep(&venc->mappings[i].mux);
1141            av_freep(&venc->mappings[i].floor);
1142            av_freep(&venc->mappings[i].residue);
1143            av_freep(&venc->mappings[i].magnitude);
1144            av_freep(&venc->mappings[i].angle);
1145        }
1146    av_freep(&venc->mappings);
1147
1148    av_freep(&venc->modes);
1149
1150    av_freep(&venc->saved);
1151    av_freep(&venc->samples);
1152    av_freep(&venc->floor);
1153    av_freep(&venc->coeffs);
1154
1155    ff_mdct_end(&venc->mdct[0]);
1156    ff_mdct_end(&venc->mdct[1]);
1157
1158    av_freep(&avctx->extradata);
1159
1160    return 0 ;
1161}
1162
1163static av_cold int vorbis_encode_init(AVCodecContext *avctx)
1164{
1165    vorbis_enc_context *venc = avctx->priv_data;
1166    int ret;
1167
1168    if (avctx->channels != 2) {
1169        av_log(avctx, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");
1170        return -1;
1171    }
1172
1173    if ((ret = create_vorbis_context(venc, avctx)) < 0)
1174        goto error;
1175
1176    avctx->bit_rate = 0;
1177    if (avctx->flags & CODEC_FLAG_QSCALE)
1178        venc->quality = avctx->global_quality / (float)FF_QP2LAMBDA;
1179    else
1180        venc->quality = 8;
1181    venc->quality *= venc->quality;
1182
1183    if ((ret = put_main_header(venc, (uint8_t**)&avctx->extradata)) < 0)
1184        goto error;
1185    avctx->extradata_size = ret;
1186
1187    avctx->frame_size = 1 << (venc->log2_blocksize[0] - 1);
1188
1189    return 0;
1190error:
1191    vorbis_encode_close(avctx);
1192    return ret;
1193}
1194
1195AVCodec ff_vorbis_encoder = {
1196    .name           = "vorbis",
1197    .long_name      = NULL_IF_CONFIG_SMALL("Vorbis"),
1198    .type           = AVMEDIA_TYPE_AUDIO,
1199    .id             = AV_CODEC_ID_VORBIS,
1200    .priv_data_size = sizeof(vorbis_enc_context),
1201    .init           = vorbis_encode_init,
1202    .encode2        = vorbis_encode_frame,
1203    .close          = vorbis_encode_close,
1204    .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_EXPERIMENTAL,
1205    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
1206                                                     AV_SAMPLE_FMT_NONE },
1207};
1208