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ffmpeg / libavcodec / vorbis_enc.c @ 2912e87a

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/*
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 * copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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21
/**
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 * @file
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 * Native Vorbis encoder.
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 * @author Oded Shimon <ods15@ods15.dyndns.org>
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 */
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#include <float.h>
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#include "avcodec.h"
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#include "dsputil.h"
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#include "fft.h"
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#include "vorbis.h"
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#include "vorbis_enc_data.h"
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#define BITSTREAM_WRITER_LE
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#include "put_bits.h"
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#undef NDEBUG
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#include <assert.h>
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typedef struct {
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    int nentries;
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    uint8_t *lens;
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    uint32_t *codewords;
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    int ndimentions;
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    float min;
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    float delta;
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    int seq_p;
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    int lookup;
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    int *quantlist;
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    float *dimentions;
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    float *pow2;
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} vorbis_enc_codebook;
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typedef struct {
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    int dim;
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    int subclass;
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    int masterbook;
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    int *books;
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} vorbis_enc_floor_class;
60

    
61
typedef struct {
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    int partitions;
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    int *partition_to_class;
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    int nclasses;
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    vorbis_enc_floor_class *classes;
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    int multiplier;
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    int rangebits;
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    int values;
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    vorbis_floor1_entry *list;
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} vorbis_enc_floor;
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typedef struct {
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    int type;
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    int begin;
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    int end;
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    int partition_size;
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    int classifications;
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    int classbook;
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    int8_t (*books)[8];
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    float (*maxes)[2];
81
} vorbis_enc_residue;
82

    
83
typedef struct {
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    int submaps;
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    int *mux;
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    int *floor;
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    int *residue;
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    int coupling_steps;
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    int *magnitude;
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    int *angle;
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} vorbis_enc_mapping;
92

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

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

    
111
    int ncodebooks;
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    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;
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} vorbis_enc_context;
128

    
129
#define MAX_CHANNELS     2
130
#define MAX_CODEBOOK_DIM 8
131

    
132
#define MAX_FLOOR_CLASS_DIM  4
133
#define NUM_FLOOR_PARTITIONS 8
134
#define MAX_FLOOR_VALUES     (MAX_FLOOR_CLASS_DIM*NUM_FLOOR_PARTITIONS+2)
135

    
136
#define RESIDUE_SIZE           1600
137
#define RESIDUE_PART_SIZE      32
138
#define NUM_RESIDUE_PARTITIONS (RESIDUE_SIZE/RESIDUE_PART_SIZE)
139

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

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

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

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

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

    
181
                cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
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                if (cb->seq_p)
183
                    last = cb->dimentions[i * cb->ndimentions + j];
184
                cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j] * cb->dimentions[i * cb->ndimentions + j];
185
                div *= vals;
186
            }
187
            cb->pow2[i] /= 2.;
188
        }
189
    }
190
}
191

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

    
209
        for (j = 0; j < cb->nentries; j++) {
210
            float a;
211
            if (!cb->lens[j])
212
                continue;
213
            a = fabs(cb->dimentions[j * cb->ndimentions]);
214
            if (a > rc->maxes[i][0])
215
                rc->maxes[i][0] = a;
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            a = fabs(cb->dimentions[j * cb->ndimentions + 1]);
217
            if (a > rc->maxes[i][1])
218
                rc->maxes[i][1] = a;
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        }
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    }
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    // small bias
222
    for (i = 0; i < rc->classifications; i++) {
223
        rc->maxes[i][0] += 0.8;
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        rc->maxes[i][1] += 0.8;
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    }
226
}
227

    
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static void create_vorbis_context(vorbis_enc_context *venc,
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                                  AVCodecContext *avccontext)
230
{
231
    vorbis_enc_floor   *fc;
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    vorbis_enc_residue *rc;
233
    vorbis_enc_mapping *mc;
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    int i, book;
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    venc->channels    = avccontext->channels;
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    venc->sample_rate = avccontext->sample_rate;
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    venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
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    venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);
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    venc->codebooks  = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
242

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

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

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

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

    
275
    // just 1 floor
276
    fc = &venc->floors[0];
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
        fc->partition_to_class[i] = a[i];
283
        fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
284
    }
285
    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
        c->dim        = floor_classes[i].dim;
291
        c->subclass   = floor_classes[i].subclass;
292
        c->masterbook = floor_classes[i].masterbook;
293
        books         = (1 << c->subclass);
294
        c->books      = av_malloc(sizeof(int) * books);
295
        for (j = 0; j < books; j++)
296
            c->books[j] = floor_classes[i].nbooks[j];
297
    }
298
    fc->multiplier = 2;
299
    fc->rangebits  = venc->log2_blocksize[0] - 1;
300

    
301
    fc->values = 2;
302
    for (i = 0; i < fc->partitions; i++)
303
        fc->values += fc->classes[fc->partition_to_class[i]].dim;
304

    
305
    fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);
306
    fc->list[0].x = 0;
307
    fc->list[1].x = 1 << fc->rangebits;
308
    for (i = 2; i < fc->values; i++) {
309
        static const int a[] = {
310
             93, 23,372,  6, 46,186,750, 14, 33, 65,
311
            130,260,556,  3, 10, 18, 28, 39, 55, 79,
312
            111,158,220,312,464,650,850
313
        };
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
    // single residue
322
    rc = &venc->residues[0];
323
    rc->type            = 2;
324
    rc->begin           = 0;
325
    rc->end             = 1600;
326
    rc->partition_size  = 32;
327
    rc->classifications = 10;
328
    rc->classbook       = 15;
329
    rc->books           = av_malloc(sizeof(*rc->books) * rc->classifications);
330
    {
331
        static const int8_t a[10][8] = {
332
            { -1, -1, -1, -1, -1, -1, -1, -1, },
333
            { -1, -1, 16, -1, -1, -1, -1, -1, },
334
            { -1, -1, 17, -1, -1, -1, -1, -1, },
335
            { -1, -1, 18, -1, -1, -1, -1, -1, },
336
            { -1, -1, 19, -1, -1, -1, -1, -1, },
337
            { -1, -1, 20, -1, -1, -1, -1, -1, },
338
            { -1, -1, 21, -1, -1, -1, -1, -1, },
339
            { 22, 23, -1, -1, -1, -1, -1, -1, },
340
            { 24, 25, -1, -1, -1, -1, -1, -1, },
341
            { 26, 27, 28, -1, -1, -1, -1, -1, },
342
        };
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
    // single mapping
351
    mc = &venc->mappings[0];
352
    mc->submaps = 1;
353
    mc->mux     = av_malloc(sizeof(int) * venc->channels);
354
    for (i = 0; i < venc->channels; i++)
355
        mc->mux[i] = 0;
356
    mc->floor   = av_malloc(sizeof(int) * mc->submaps);
357
    mc->residue = av_malloc(sizeof(int) * mc->submaps);
358
    for (i = 0; i < mc->submaps; i++) {
359
        mc->floor[i]   = 0;
360
        mc->residue[i] = 0;
361
    }
362
    mc->coupling_steps = venc->channels == 2 ? 1 : 0;
363
    mc->magnitude      = av_malloc(sizeof(int) * mc->coupling_steps);
364
    mc->angle          = av_malloc(sizeof(int) * mc->coupling_steps);
365
    if (mc->coupling_steps) {
366
        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
    // single mode
374
    venc->modes[0].blockflag = 0;
375
    venc->modes[0].mapping   = 0;
376

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

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

    
386
    ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0);
387
    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
    int exp, mant;
393
    uint32_t res = 0;
394
    mant = (int)ldexp(frexp(f, &exp), 20);
395
    exp += 788 - 20;
396
    if (mant < 0) {
397
        res |= (1 << 31);
398
        mant = -mant;
399
    }
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
    int i;
407
    int ordered = 0;
408

    
409
    put_bits(pb, 24, 0x564342); //magic
410
    put_bits(pb, 16, cb->ndimentions);
411
    put_bits(pb, 24, cb->nentries);
412

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

    
419
    put_bits(pb, 1, ordered);
420
    if (ordered) {
421
        int len = cb->lens[0];
422
        put_bits(pb, 5, len - 1);
423
        i = 0;
424
        while (i < cb->nentries) {
425
            int j;
426
            for (j = 0; j+i < cb->nentries; j++)
427
                if (cb->lens[j+i] != len)
428
                    break;
429
            put_bits(pb, ilog(cb->nentries - i), j);
430
            i += j;
431
            len++;
432
        }
433
    } else {
434
        int sparse = 0;
435
        for (i = 0; i < cb->nentries; i++)
436
            if (!cb->lens[i])
437
                break;
438
        if (i != cb->nentries)
439
            sparse = 1;
440
        put_bits(pb, 1, sparse);
441

    
442
        for (i = 0; i < cb->nentries; i++) {
443
            if (sparse)
444
                put_bits(pb, 1, !!cb->lens[i]);
445
            if (cb->lens[i])
446
                put_bits(pb, 5, cb->lens[i] - 1);
447
        }
448
    }
449

    
450
    put_bits(pb, 4, cb->lookup);
451
    if (cb->lookup) {
452
        int tmp  = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
453
        int bits = ilog(cb->quantlist[0]);
454

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

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

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

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

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

    
473
    put_bits(pb, 16, 1); // type, only floor1 is supported
474

    
475
    put_bits(pb, 5, fc->partitions);
476

    
477
    for (i = 0; i < fc->partitions; i++)
478
        put_bits(pb, 4, fc->partition_to_class[i]);
479

    
480
    for (i = 0; i < fc->nclasses; i++) {
481
        int j, books;
482

    
483
        put_bits(pb, 3, fc->classes[i].dim - 1);
484
        put_bits(pb, 2, fc->classes[i].subclass);
485

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

    
489
        books = (1 << fc->classes[i].subclass);
490

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

    
495
    put_bits(pb, 2, fc->multiplier - 1);
496
    put_bits(pb, 4, fc->rangebits);
497

    
498
    for (i = 2; i < fc->values; i++)
499
        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
    int i;
505

    
506
    put_bits(pb, 16, rc->type);
507

    
508
    put_bits(pb, 24, rc->begin);
509
    put_bits(pb, 24, rc->end);
510
    put_bits(pb, 24, rc->partition_size - 1);
511
    put_bits(pb, 6, rc->classifications - 1);
512
    put_bits(pb, 8, rc->classbook);
513

    
514
    for (i = 0; i < rc->classifications; i++) {
515
        int j, tmp = 0;
516
        for (j = 0; j < 8; j++)
517
            tmp |= (rc->books[i][j] != -1) << j;
518

    
519
        put_bits(pb, 3, tmp & 7);
520
        put_bits(pb, 1, tmp > 7);
521

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

    
526
    for (i = 0; i < rc->classifications; i++) {
527
        int j;
528
        for (j = 0; j < 8; j++)
529
            if (rc->books[i][j] != -1)
530
                put_bits(pb, 8, rc->books[i][j]);
531
    }
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
    int buffer_len = sizeof buffer;
540
    int len, hlens[3];
541

    
542
    // identification header
543
    init_put_bits(&pb, p, buffer_len);
544
    put_bits(&pb, 8, 1); //magic
545
    for (i = 0; "vorbis"[i]; i++)
546
        put_bits(&pb, 8, "vorbis"[i]);
547
    put_bits32(&pb, 0); // version
548
    put_bits(&pb,  8, venc->channels);
549
    put_bits32(&pb, venc->sample_rate);
550
    put_bits32(&pb, 0); // bitrate
551
    put_bits32(&pb, 0); // bitrate
552
    put_bits32(&pb, 0); // bitrate
553
    put_bits(&pb,  4, venc->log2_blocksize[0]);
554
    put_bits(&pb,  4, venc->log2_blocksize[1]);
555
    put_bits(&pb,  1, 1); // framing
556

    
557
    flush_put_bits(&pb);
558
    hlens[0] = put_bits_count(&pb) >> 3;
559
    buffer_len -= hlens[0];
560
    p += hlens[0];
561

    
562
    // comment header
563
    init_put_bits(&pb, p, buffer_len);
564
    put_bits(&pb, 8, 3); //magic
565
    for (i = 0; "vorbis"[i]; i++)
566
        put_bits(&pb, 8, "vorbis"[i]);
567
    put_bits32(&pb, 0); // vendor length TODO
568
    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
    buffer_len -= hlens[1];
574
    p += hlens[1];
575

    
576
    // setup header
577
    init_put_bits(&pb, p, buffer_len);
578
    put_bits(&pb, 8, 5); //magic
579
    for (i = 0; "vorbis"[i]; i++)
580
        put_bits(&pb, 8, "vorbis"[i]);
581

    
582
    // codebooks
583
    put_bits(&pb, 8, venc->ncodebooks - 1);
584
    for (i = 0; i < venc->ncodebooks; i++)
585
        put_codebook_header(&pb, &venc->codebooks[i]);
586

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

    
591
    // floors
592
    put_bits(&pb, 6, venc->nfloors - 1);
593
    for (i = 0; i < venc->nfloors; i++)
594
        put_floor_header(&pb, &venc->floors[i]);
595

    
596
    // residues
597
    put_bits(&pb, 6, venc->nresidues - 1);
598
    for (i = 0; i < venc->nresidues; i++)
599
        put_residue_header(&pb, &venc->residues[i]);
600

    
601
    // mappings
602
    put_bits(&pb, 6, venc->nmappings - 1);
603
    for (i = 0; i < venc->nmappings; i++) {
604
        vorbis_enc_mapping *mc = &venc->mappings[i];
605
        int j;
606
        put_bits(&pb, 16, 0); // mapping type
607

    
608
        put_bits(&pb, 1, mc->submaps > 1);
609
        if (mc->submaps > 1)
610
            put_bits(&pb, 4, mc->submaps - 1);
611

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

    
621
        put_bits(&pb, 2, 0); // reserved
622

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

    
627
        for (j = 0; j < mc->submaps; j++) {
628
            put_bits(&pb, 8, 0); // reserved time configuration
629
            put_bits(&pb, 8, mc->floor[j]);
630
            put_bits(&pb, 8, mc->residue[j]);
631
        }
632
    }
633

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

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

    
645
    flush_put_bits(&pb);
646
    hlens[2] = put_bits_count(&pb) >> 3;
647

    
648
    len = hlens[0] + hlens[1] + hlens[2];
649
    p = *out = av_mallocz(64 + len + len/255);
650

    
651
    *p++ = 2;
652
    p += av_xiphlacing(p, hlens[0]);
653
    p += av_xiphlacing(p, hlens[1]);
654
    buffer_len = 0;
655
    for (i = 0; i < 3; i++) {
656
        memcpy(p, buffer + buffer_len, hlens[i]);
657
        p += hlens[i];
658
        buffer_len += hlens[i];
659
    }
660

    
661
    return p - *out;
662
}
663

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

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

    
676
static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc,
677
                      float *coeffs, uint_fast16_t *posts, int samples)
678
{
679
    int range = 255 / fc->multiplier + 1;
680
    int i;
681
    float tot_average = 0.;
682
    float averages[MAX_FLOOR_VALUES];
683
    for (i = 0; i < fc->values; i++) {
684
        averages[i] = get_floor_average(fc, coeffs, i);
685
        tot_average += averages[i];
686
    }
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
        int j;
694

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

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

    
708
static void floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,
709
                         PutBitContext *pb, uint_fast16_t *posts,
710
                         float *floor, int samples)
711
{
712
    int range = 255 / fc->multiplier + 1;
713
    int coded[MAX_FLOOR_VALUES]; // first 2 values are unused
714
    int i, counter;
715

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

    
721
    for (i = 2; i < fc->values; i++) {
722
        int predicted = render_point(fc->list[fc->list[i].low].x,
723
                                     posts[fc->list[i].low],
724
                                     fc->list[fc->list[i].high].x,
725
                                     posts[fc->list[i].high],
726
                                     fc->list[i].x);
727
        int highroom = range - predicted;
728
        int lowroom = predicted;
729
        int room = FFMIN(highroom, lowroom);
730
        if (predicted == posts[i]) {
731
            coded[i] = 0; // must be used later as flag!
732
            continue;
733
        } else {
734
            if (!coded[fc->list[i].low ])
735
                coded[fc->list[i].low ] = -1;
736
            if (!coded[fc->list[i].high])
737
                coded[fc->list[i].high] = -1;
738
        }
739
        if (posts[i] > predicted) {
740
            if (posts[i] - predicted > room)
741
                coded[i] = posts[i] - predicted + lowroom;
742
            else
743
                coded[i] = (posts[i] - predicted) << 1;
744
        } else {
745
            if (predicted - posts[i] > room)
746
                coded[i] = predicted - posts[i] + highroom - 1;
747
            else
748
                coded[i] = ((predicted - posts[i]) << 1) - 1;
749
        }
750
    }
751

    
752
    counter = 2;
753
    for (i = 0; i < fc->partitions; i++) {
754
        vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
755
        int k, cval = 0, csub = 1<<c->subclass;
756
        if (c->subclass) {
757
            vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
758
            int cshift = 0;
759
            for (k = 0; k < c->dim; k++) {
760
                int l;
761
                for (l = 0; l < csub; l++) {
762
                    int maxval = 1;
763
                    if (c->books[l] != -1)
764
                        maxval = venc->codebooks[c->books[l]].nentries;
765
                    // coded could be -1, but this still works, cause that is 0
766
                    if (coded[counter + k] < maxval)
767
                        break;
768
                }
769
                assert(l != csub);
770
                cval   |= l << cshift;
771
                cshift += c->subclass;
772
            }
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
            if (book == -1)
780
                continue;
781
            if (entry == -1)
782
                entry = 0;
783
            put_codeword(pb, &venc->codebooks[book], entry);
784
        }
785
    }
786

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

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

    
813
static void residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,
814
                           PutBitContext *pb, float *coeffs, int samples,
815
                           int real_ch)
816
{
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;
821
    int classes[MAX_CHANNELS][NUM_RESIDUE_PARTITIONS];
822
    int classwords = venc->codebooks[rc->classbook].ndimentions;
823

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

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

    
840
    for (pass = 0; pass < 8; pass++) {
841
        p = 0;
842
        while (p < partitions) {
843
            if (pass == 0)
844
                for (j = 0; j < channels; j++) {
845
                    vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
846
                    int entry = 0;
847
                    for (i = 0; i < classwords; i++) {
848
                        entry *= rc->classifications;
849
                        entry += classes[j][p + i];
850
                    }
851
                    put_codeword(pb, book, entry);
852
                }
853
            for (i = 0; i < classwords && p < partitions; i++, p++) {
854
                for (j = 0; j < channels; j++) {
855
                    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
                    if (nbook == -1)
859
                        continue;
860

    
861
                    assert(rc->type == 0 || rc->type == 2);
862
                    assert(!(psize % book->ndimentions));
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
                            for (l = 0; l < book->ndimentions; l++)
869
                                buf[k + l] -= a[l];
870
                        }
871
                    } else {
872
                        int s = rc->begin + p * psize, a1, b1;
873
                        a1 = (s % real_ch) * samples;
874
                        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;
878
                            float vec[MAX_CODEBOOK_DIM], *pv = vec;
879
                            for (dim = book->ndimentions; dim--; ) {
880
                                *pv++ = coeffs[a2 + b2];
881
                                if ((a2 += samples) == s) {
882
                                    a2 = 0;
883
                                    b2++;
884
                                }
885
                            }
886
                            pv = put_vector(book, pb, vec);
887
                            for (dim = book->ndimentions; dim--; ) {
888
                                coeffs[a1 + b1] -= *pv++;
889
                                if ((a1 += samples) == s) {
890
                                    a1 = 0;
891
                                    b1++;
892
                                }
893
                            }
894
                        }
895
                    }
896
                }
897
            }
898
        }
899
    }
900
}
901

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

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

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

    
924
    if (samples) {
925
        for (channel = 0; channel < venc->channels; channel++) {
926
            float * offset = venc->samples + channel*window_len*2 + window_len;
927
            j = channel;
928
            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
            memset(venc->samples + channel * window_len * 2 + window_len,
934
                   0, sizeof(float) * window_len);
935
    }
936

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

    
941
    if (samples) {
942
        for (channel = 0; channel < venc->channels; channel++) {
943
            float *offset = venc->saved + channel * window_len;
944
            j = channel;
945
            for (i = 0; i < samples; i++, j += venc->channels)
946
                offset[i] = audio[j] / 32768. / n * win[i];
947
        }
948
        venc->have_saved = 1;
949
    } else {
950
        venc->have_saved = 0;
951
    }
952
    return 1;
953
}
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 FFmpeg Vorbis encoder only supports 2 channels.\n");
961
        return -1;
962
    }
963

    
964
    create_vorbis_context(venc, avccontext);
965

    
966
    if (avccontext->flags & CODEC_FLAG_QSCALE)
967
        venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
968
    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
    avccontext->coded_frame->key_frame = 1;
978

    
979
    return 0;
980
}
981

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

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

    
998
    init_put_bits(&pb, packets, buf_size);
999

    
1000
    put_bits(&pb, 1, 0); // magic bit
1001

    
1002
    put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
1003

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

    
1011
    for (i = 0; i < venc->channels; i++) {
1012
        vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
1013
        uint_fast16_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
    }
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
        float *mag = venc->coeffs + mapping->magnitude[i] * samples;
1023
        float *ang = venc->coeffs + mapping->angle[i]     * samples;
1024
        int j;
1025
        for (j = 0; j < samples; j++) {
1026
            float a = ang[j];
1027
            ang[j] -= mag[j];
1028
            if (mag[j] > 0)
1029
                ang[j] = -ang[j];
1030
            if (ang[j] < 0)
1031
                mag[j] = a;
1032
        }
1033
    }
1034

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

    
1038
    avccontext->coded_frame->pts = venc->sample_count;
1039
    venc->sample_count += avccontext->frame_size;
1040
    flush_put_bits(&pb);
1041
    return put_bits_count(&pb) >> 3;
1042
}
1043

    
1044

    
1045
static av_cold int vorbis_encode_close(AVCodecContext *avccontext)
1046
{
1047
    vorbis_enc_context *venc = avccontext->priv_data;
1048
    int i;
1049

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

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

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

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

    
1089
    av_freep(&venc->modes);
1090

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

    
1096
    ff_mdct_end(&venc->mdct[0]);
1097
    ff_mdct_end(&venc->mdct[1]);
1098

    
1099
    av_freep(&avccontext->coded_frame);
1100
    av_freep(&avccontext->extradata);
1101

    
1102
    return 0 ;
1103
}
1104

    
1105
AVCodec ff_vorbis_encoder = {
1106
    "vorbis",
1107
    AVMEDIA_TYPE_AUDIO,
1108
    CODEC_ID_VORBIS,
1109
    sizeof(vorbis_enc_context),
1110
    vorbis_encode_init,
1111
    vorbis_encode_frame,
1112
    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"),
1116
};