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ffmpeg / libavcodec / vorbis_enc.c @ 72415b2a

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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 FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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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/**
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 * @file libavcodec/vorbis_enc.c
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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;
71

    
72
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];
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} 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 {
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    int blockflag;
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    int mapping;
96
} vorbis_enc_mode;
97

    
98
typedef struct {
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    int channels;
100
    int sample_rate;
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    int log2_blocksize[2];
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    FFTContext mdct[2];
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    const float *win[2];
104
    int have_saved;
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    float *saved;
106
    float *samples;
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    float *floor;  // also used for tmp values for mdct
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    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;
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    vorbis_enc_residue *residues;
119

    
120
    int nmappings;
121
    vorbis_enc_mapping *mappings;
122

    
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    int nmodes;
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    vorbis_enc_mode *modes;
125

    
126
    int64_t sample_count;
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} vorbis_enc_context;
128

    
129
static inline void put_codeword(PutBitContext *pb, vorbis_enc_codebook *cb,
130
                                int entry)
131
{
132
    assert(entry >= 0);
133
    assert(entry < cb->nentries);
134
    assert(cb->lens[entry]);
135
    put_bits(pb, cb->lens[entry], cb->codewords[entry]);
136
}
137

    
138
static int cb_lookup_vals(int lookup, int dimentions, int entries)
139
{
140
    if (lookup == 1)
141
        return ff_vorbis_nth_root(entries, dimentions);
142
    else if (lookup == 2)
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        return dimentions *entries;
144
    return 0;
145
}
146

    
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static void ready_codebook(vorbis_enc_codebook *cb)
148
{
149
    int i;
150

    
151
    ff_vorbis_len2vlc(cb->lens, cb->codewords, cb->nentries);
152

    
153
    if (!cb->lookup) {
154
        cb->pow2 = cb->dimentions = NULL;
155
    } else {
156
        int vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
157
        cb->dimentions = av_malloc(sizeof(float) * cb->nentries * cb->ndimentions);
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        cb->pow2 = av_mallocz(sizeof(float) * cb->nentries);
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        for (i = 0; i < cb->nentries; i++) {
160
            float last = 0;
161
            int j;
162
            int div = 1;
163
            for (j = 0; j < cb->ndimentions; j++) {
164
                int off;
165
                if (cb->lookup == 1)
166
                    off = (i / div) % vals; // lookup type 1
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                else
168
                    off = i * cb->ndimentions + j; // lookup type 2
169

    
170
                cb->dimentions[i * cb->ndimentions + j] = last + cb->min + cb->quantlist[off] * cb->delta;
171
                if (cb->seq_p)
172
                    last = cb->dimentions[i * cb->ndimentions + j];
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                cb->pow2[i] += cb->dimentions[i * cb->ndimentions + j] * cb->dimentions[i * cb->ndimentions + j];
174
                div *= vals;
175
            }
176
            cb->pow2[i] /= 2.;
177
        }
178
    }
179
}
180

    
181
static void ready_residue(vorbis_enc_residue *rc, vorbis_enc_context *venc)
182
{
183
    int i;
184
    assert(rc->type == 2);
185
    rc->maxes = av_mallocz(sizeof(float[2]) * rc->classifications);
186
    for (i = 0; i < rc->classifications; i++) {
187
        int j;
188
        vorbis_enc_codebook * cb;
189
        for (j = 0; j < 8; j++)
190
            if (rc->books[i][j] != -1)
191
                break;
192
        if (j == 8) // zero
193
            continue;
194
        cb = &venc->codebooks[rc->books[i][j]];
195
        assert(cb->ndimentions >= 2);
196
        assert(cb->lookup);
197

    
198
        for (j = 0; j < cb->nentries; j++) {
199
            float a;
200
            if (!cb->lens[j])
201
                continue;
202
            a = fabs(cb->dimentions[j * cb->ndimentions]);
203
            if (a > rc->maxes[i][0])
204
                rc->maxes[i][0] = a;
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            a = fabs(cb->dimentions[j * cb->ndimentions + 1]);
206
            if (a > rc->maxes[i][1])
207
                rc->maxes[i][1] = a;
208
        }
209
    }
210
    // small bias
211
    for (i = 0; i < rc->classifications; i++) {
212
        rc->maxes[i][0] += 0.8;
213
        rc->maxes[i][1] += 0.8;
214
    }
215
}
216

    
217
static void create_vorbis_context(vorbis_enc_context *venc,
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                                  AVCodecContext *avccontext)
219
{
220
    vorbis_enc_floor   *fc;
221
    vorbis_enc_residue *rc;
222
    vorbis_enc_mapping *mc;
223
    int i, book;
224

    
225
    venc->channels    = avccontext->channels;
226
    venc->sample_rate = avccontext->sample_rate;
227
    venc->log2_blocksize[0] = venc->log2_blocksize[1] = 11;
228

    
229
    venc->ncodebooks = FF_ARRAY_ELEMS(cvectors);
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    venc->codebooks  = av_malloc(sizeof(vorbis_enc_codebook) * venc->ncodebooks);
231

    
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    // codebook 0..14 - floor1 book, values 0..255
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    // codebook 15 residue masterbook
234
    // codebook 16..29 residue
235
    for (book = 0; book < venc->ncodebooks; book++) {
236
        vorbis_enc_codebook *cb = &venc->codebooks[book];
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        int vals;
238
        cb->ndimentions = cvectors[book].dim;
239
        cb->nentries    = cvectors[book].real_len;
240
        cb->min         = cvectors[book].min;
241
        cb->delta       = cvectors[book].delta;
242
        cb->lookup      = cvectors[book].lookup;
243
        cb->seq_p       = 0;
244

    
245
        cb->lens      = av_malloc(sizeof(uint8_t)  * cb->nentries);
246
        cb->codewords = av_malloc(sizeof(uint32_t) * cb->nentries);
247
        memcpy(cb->lens, cvectors[book].clens, cvectors[book].len);
248
        memset(cb->lens + cvectors[book].len, 0, cb->nentries - cvectors[book].len);
249

    
250
        if (cb->lookup) {
251
            vals = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
252
            cb->quantlist = av_malloc(sizeof(int) * vals);
253
            for (i = 0; i < vals; i++)
254
                cb->quantlist[i] = cvectors[book].quant[i];
255
        } else {
256
            cb->quantlist = NULL;
257
        }
258
        ready_codebook(cb);
259
    }
260

    
261
    venc->nfloors = 1;
262
    venc->floors  = av_malloc(sizeof(vorbis_enc_floor) * venc->nfloors);
263

    
264
    // just 1 floor
265
    fc = &venc->floors[0];
266
    fc->partitions         = 8;
267
    fc->partition_to_class = av_malloc(sizeof(int) * fc->partitions);
268
    fc->nclasses           = 0;
269
    for (i = 0; i < fc->partitions; i++) {
270
        static const int a[] = {0, 1, 2, 2, 3, 3, 4, 4};
271
        fc->partition_to_class[i] = a[i];
272
        fc->nclasses = FFMAX(fc->nclasses, fc->partition_to_class[i]);
273
    }
274
    fc->nclasses++;
275
    fc->classes = av_malloc(sizeof(vorbis_enc_floor_class) * fc->nclasses);
276
    for (i = 0; i < fc->nclasses; i++) {
277
        vorbis_enc_floor_class * c = &fc->classes[i];
278
        int j, books;
279
        c->dim        = floor_classes[i].dim;
280
        c->subclass   = floor_classes[i].subclass;
281
        c->masterbook = floor_classes[i].masterbook;
282
        books         = (1 << c->subclass);
283
        c->books      = av_malloc(sizeof(int) * books);
284
        for (j = 0; j < books; j++)
285
            c->books[j] = floor_classes[i].nbooks[j];
286
    }
287
    fc->multiplier = 2;
288
    fc->rangebits  = venc->log2_blocksize[0] - 1;
289

    
290
    fc->values = 2;
291
    for (i = 0; i < fc->partitions; i++)
292
        fc->values += fc->classes[fc->partition_to_class[i]].dim;
293

    
294
    fc->list = av_malloc(sizeof(vorbis_floor1_entry) * fc->values);
295
    fc->list[0].x = 0;
296
    fc->list[1].x = 1 << fc->rangebits;
297
    for (i = 2; i < fc->values; i++) {
298
        static const int a[] = {
299
             93, 23,372,  6, 46,186,750, 14, 33, 65,
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            130,260,556,  3, 10, 18, 28, 39, 55, 79,
301
            111,158,220,312,464,650,850
302
        };
303
        fc->list[i].x = a[i - 2];
304
    }
305
    ff_vorbis_ready_floor1_list(fc->list, fc->values);
306

    
307
    venc->nresidues = 1;
308
    venc->residues  = av_malloc(sizeof(vorbis_enc_residue) * venc->nresidues);
309

    
310
    // single residue
311
    rc = &venc->residues[0];
312
    rc->type            = 2;
313
    rc->begin           = 0;
314
    rc->end             = 1600;
315
    rc->partition_size  = 32;
316
    rc->classifications = 10;
317
    rc->classbook       = 15;
318
    rc->books           = av_malloc(sizeof(*rc->books) * rc->classifications);
319
    {
320
        static const int8_t a[10][8] = {
321
            { -1, -1, -1, -1, -1, -1, -1, -1, },
322
            { -1, -1, 16, -1, -1, -1, -1, -1, },
323
            { -1, -1, 17, -1, -1, -1, -1, -1, },
324
            { -1, -1, 18, -1, -1, -1, -1, -1, },
325
            { -1, -1, 19, -1, -1, -1, -1, -1, },
326
            { -1, -1, 20, -1, -1, -1, -1, -1, },
327
            { -1, -1, 21, -1, -1, -1, -1, -1, },
328
            { 22, 23, -1, -1, -1, -1, -1, -1, },
329
            { 24, 25, -1, -1, -1, -1, -1, -1, },
330
            { 26, 27, 28, -1, -1, -1, -1, -1, },
331
        };
332
        memcpy(rc->books, a, sizeof a);
333
    }
334
    ready_residue(rc, venc);
335

    
336
    venc->nmappings = 1;
337
    venc->mappings  = av_malloc(sizeof(vorbis_enc_mapping) * venc->nmappings);
338

    
339
    // single mapping
340
    mc = &venc->mappings[0];
341
    mc->submaps = 1;
342
    mc->mux     = av_malloc(sizeof(int) * venc->channels);
343
    for (i = 0; i < venc->channels; i++)
344
        mc->mux[i] = 0;
345
    mc->floor   = av_malloc(sizeof(int) * mc->submaps);
346
    mc->residue = av_malloc(sizeof(int) * mc->submaps);
347
    for (i = 0; i < mc->submaps; i++) {
348
        mc->floor[i]   = 0;
349
        mc->residue[i] = 0;
350
    }
351
    mc->coupling_steps = venc->channels == 2 ? 1 : 0;
352
    mc->magnitude      = av_malloc(sizeof(int) * mc->coupling_steps);
353
    mc->angle          = av_malloc(sizeof(int) * mc->coupling_steps);
354
    if (mc->coupling_steps) {
355
        mc->magnitude[0] = 0;
356
        mc->angle[0]     = 1;
357
    }
358

    
359
    venc->nmodes = 1;
360
    venc->modes  = av_malloc(sizeof(vorbis_enc_mode) * venc->nmodes);
361

    
362
    // single mode
363
    venc->modes[0].blockflag = 0;
364
    venc->modes[0].mapping   = 0;
365

    
366
    venc->have_saved = 0;
367
    venc->saved      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
368
    venc->samples    = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]));
369
    venc->floor      = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
370
    venc->coeffs     = av_malloc(sizeof(float) * venc->channels * (1 << venc->log2_blocksize[1]) / 2);
371

    
372
    venc->win[0] = ff_vorbis_vwin[venc->log2_blocksize[0] - 6];
373
    venc->win[1] = ff_vorbis_vwin[venc->log2_blocksize[1] - 6];
374

    
375
    ff_mdct_init(&venc->mdct[0], venc->log2_blocksize[0], 0, 1.0);
376
    ff_mdct_init(&venc->mdct[1], venc->log2_blocksize[1], 0, 1.0);
377
}
378

    
379
static void put_float(PutBitContext *pb, float f)
380
{
381
    int exp, mant;
382
    uint32_t res = 0;
383
    mant = (int)ldexp(frexp(f, &exp), 20);
384
    exp += 788 - 20;
385
    if (mant < 0) {
386
        res |= (1 << 31);
387
        mant = -mant;
388
    }
389
    res |= mant | (exp << 21);
390
    put_bits32(pb, res);
391
}
392

    
393
static void put_codebook_header(PutBitContext *pb, vorbis_enc_codebook *cb)
394
{
395
    int i;
396
    int ordered = 0;
397

    
398
    put_bits(pb, 24, 0x564342); //magic
399
    put_bits(pb, 16, cb->ndimentions);
400
    put_bits(pb, 24, cb->nentries);
401

    
402
    for (i = 1; i < cb->nentries; i++)
403
        if (cb->lens[i] < cb->lens[i-1])
404
            break;
405
    if (i == cb->nentries)
406
        ordered = 1;
407

    
408
    put_bits(pb, 1, ordered);
409
    if (ordered) {
410
        int len = cb->lens[0];
411
        put_bits(pb, 5, len - 1);
412
        i = 0;
413
        while (i < cb->nentries) {
414
            int j;
415
            for (j = 0; j+i < cb->nentries; j++)
416
                if (cb->lens[j+i] != len)
417
                    break;
418
            put_bits(pb, ilog(cb->nentries - i), j);
419
            i += j;
420
            len++;
421
        }
422
    } else {
423
        int sparse = 0;
424
        for (i = 0; i < cb->nentries; i++)
425
            if (!cb->lens[i])
426
                break;
427
        if (i != cb->nentries)
428
            sparse = 1;
429
        put_bits(pb, 1, sparse);
430

    
431
        for (i = 0; i < cb->nentries; i++) {
432
            if (sparse)
433
                put_bits(pb, 1, !!cb->lens[i]);
434
            if (cb->lens[i])
435
                put_bits(pb, 5, cb->lens[i] - 1);
436
        }
437
    }
438

    
439
    put_bits(pb, 4, cb->lookup);
440
    if (cb->lookup) {
441
        int tmp  = cb_lookup_vals(cb->lookup, cb->ndimentions, cb->nentries);
442
        int bits = ilog(cb->quantlist[0]);
443

    
444
        for (i = 1; i < tmp; i++)
445
            bits = FFMAX(bits, ilog(cb->quantlist[i]));
446

    
447
        put_float(pb, cb->min);
448
        put_float(pb, cb->delta);
449

    
450
        put_bits(pb, 4, bits - 1);
451
        put_bits(pb, 1, cb->seq_p);
452

    
453
        for (i = 0; i < tmp; i++)
454
            put_bits(pb, bits, cb->quantlist[i]);
455
    }
456
}
457

    
458
static void put_floor_header(PutBitContext *pb, vorbis_enc_floor *fc)
459
{
460
    int i;
461

    
462
    put_bits(pb, 16, 1); // type, only floor1 is supported
463

    
464
    put_bits(pb, 5, fc->partitions);
465

    
466
    for (i = 0; i < fc->partitions; i++)
467
        put_bits(pb, 4, fc->partition_to_class[i]);
468

    
469
    for (i = 0; i < fc->nclasses; i++) {
470
        int j, books;
471

    
472
        put_bits(pb, 3, fc->classes[i].dim - 1);
473
        put_bits(pb, 2, fc->classes[i].subclass);
474

    
475
        if (fc->classes[i].subclass)
476
            put_bits(pb, 8, fc->classes[i].masterbook);
477

    
478
        books = (1 << fc->classes[i].subclass);
479

    
480
        for (j = 0; j < books; j++)
481
            put_bits(pb, 8, fc->classes[i].books[j] + 1);
482
    }
483

    
484
    put_bits(pb, 2, fc->multiplier - 1);
485
    put_bits(pb, 4, fc->rangebits);
486

    
487
    for (i = 2; i < fc->values; i++)
488
        put_bits(pb, fc->rangebits, fc->list[i].x);
489
}
490

    
491
static void put_residue_header(PutBitContext *pb, vorbis_enc_residue *rc)
492
{
493
    int i;
494

    
495
    put_bits(pb, 16, rc->type);
496

    
497
    put_bits(pb, 24, rc->begin);
498
    put_bits(pb, 24, rc->end);
499
    put_bits(pb, 24, rc->partition_size - 1);
500
    put_bits(pb, 6, rc->classifications - 1);
501
    put_bits(pb, 8, rc->classbook);
502

    
503
    for (i = 0; i < rc->classifications; i++) {
504
        int j, tmp = 0;
505
        for (j = 0; j < 8; j++)
506
            tmp |= (rc->books[i][j] != -1) << j;
507

    
508
        put_bits(pb, 3, tmp & 7);
509
        put_bits(pb, 1, tmp > 7);
510

    
511
        if (tmp > 7)
512
            put_bits(pb, 5, tmp >> 3);
513
    }
514

    
515
    for (i = 0; i < rc->classifications; i++) {
516
        int j;
517
        for (j = 0; j < 8; j++)
518
            if (rc->books[i][j] != -1)
519
                put_bits(pb, 8, rc->books[i][j]);
520
    }
521
}
522

    
523
static int put_main_header(vorbis_enc_context *venc, uint8_t **out)
524
{
525
    int i;
526
    PutBitContext pb;
527
    uint8_t buffer[50000] = {0}, *p = buffer;
528
    int buffer_len = sizeof buffer;
529
    int len, hlens[3];
530

    
531
    // identification header
532
    init_put_bits(&pb, p, buffer_len);
533
    put_bits(&pb, 8, 1); //magic
534
    for (i = 0; "vorbis"[i]; i++)
535
        put_bits(&pb, 8, "vorbis"[i]);
536
    put_bits32(&pb, 0); // version
537
    put_bits(&pb,  8, venc->channels);
538
    put_bits32(&pb, venc->sample_rate);
539
    put_bits32(&pb, 0); // bitrate
540
    put_bits32(&pb, 0); // bitrate
541
    put_bits32(&pb, 0); // bitrate
542
    put_bits(&pb,  4, venc->log2_blocksize[0]);
543
    put_bits(&pb,  4, venc->log2_blocksize[1]);
544
    put_bits(&pb,  1, 1); // framing
545

    
546
    flush_put_bits(&pb);
547
    hlens[0] = put_bits_count(&pb) >> 3;
548
    buffer_len -= hlens[0];
549
    p += hlens[0];
550

    
551
    // comment header
552
    init_put_bits(&pb, p, buffer_len);
553
    put_bits(&pb, 8, 3); //magic
554
    for (i = 0; "vorbis"[i]; i++)
555
        put_bits(&pb, 8, "vorbis"[i]);
556
    put_bits32(&pb, 0); // vendor length TODO
557
    put_bits32(&pb, 0); // amount of comments
558
    put_bits(&pb,  1, 1); // framing
559

    
560
    flush_put_bits(&pb);
561
    hlens[1] = put_bits_count(&pb) >> 3;
562
    buffer_len -= hlens[1];
563
    p += hlens[1];
564

    
565
    // setup header
566
    init_put_bits(&pb, p, buffer_len);
567
    put_bits(&pb, 8, 5); //magic
568
    for (i = 0; "vorbis"[i]; i++)
569
        put_bits(&pb, 8, "vorbis"[i]);
570

    
571
    // codebooks
572
    put_bits(&pb, 8, venc->ncodebooks - 1);
573
    for (i = 0; i < venc->ncodebooks; i++)
574
        put_codebook_header(&pb, &venc->codebooks[i]);
575

    
576
    // time domain, reserved, zero
577
    put_bits(&pb,  6, 0);
578
    put_bits(&pb, 16, 0);
579

    
580
    // floors
581
    put_bits(&pb, 6, venc->nfloors - 1);
582
    for (i = 0; i < venc->nfloors; i++)
583
        put_floor_header(&pb, &venc->floors[i]);
584

    
585
    // residues
586
    put_bits(&pb, 6, venc->nresidues - 1);
587
    for (i = 0; i < venc->nresidues; i++)
588
        put_residue_header(&pb, &venc->residues[i]);
589

    
590
    // mappings
591
    put_bits(&pb, 6, venc->nmappings - 1);
592
    for (i = 0; i < venc->nmappings; i++) {
593
        vorbis_enc_mapping *mc = &venc->mappings[i];
594
        int j;
595
        put_bits(&pb, 16, 0); // mapping type
596

    
597
        put_bits(&pb, 1, mc->submaps > 1);
598
        if (mc->submaps > 1)
599
            put_bits(&pb, 4, mc->submaps - 1);
600

    
601
        put_bits(&pb, 1, !!mc->coupling_steps);
602
        if (mc->coupling_steps) {
603
            put_bits(&pb, 8, mc->coupling_steps - 1);
604
            for (j = 0; j < mc->coupling_steps; j++) {
605
                put_bits(&pb, ilog(venc->channels - 1), mc->magnitude[j]);
606
                put_bits(&pb, ilog(venc->channels - 1), mc->angle[j]);
607
            }
608
        }
609

    
610
        put_bits(&pb, 2, 0); // reserved
611

    
612
        if (mc->submaps > 1)
613
            for (j = 0; j < venc->channels; j++)
614
                put_bits(&pb, 4, mc->mux[j]);
615

    
616
        for (j = 0; j < mc->submaps; j++) {
617
            put_bits(&pb, 8, 0); // reserved time configuration
618
            put_bits(&pb, 8, mc->floor[j]);
619
            put_bits(&pb, 8, mc->residue[j]);
620
        }
621
    }
622

    
623
    // modes
624
    put_bits(&pb, 6, venc->nmodes - 1);
625
    for (i = 0; i < venc->nmodes; i++) {
626
        put_bits(&pb, 1, venc->modes[i].blockflag);
627
        put_bits(&pb, 16, 0); // reserved window type
628
        put_bits(&pb, 16, 0); // reserved transform type
629
        put_bits(&pb, 8, venc->modes[i].mapping);
630
    }
631

    
632
    put_bits(&pb, 1, 1); // framing
633

    
634
    flush_put_bits(&pb);
635
    hlens[2] = put_bits_count(&pb) >> 3;
636

    
637
    len = hlens[0] + hlens[1] + hlens[2];
638
    p = *out = av_mallocz(64 + len + len/255);
639

    
640
    *p++ = 2;
641
    p += av_xiphlacing(p, hlens[0]);
642
    p += av_xiphlacing(p, hlens[1]);
643
    buffer_len = 0;
644
    for (i = 0; i < 3; i++) {
645
        memcpy(p, buffer + buffer_len, hlens[i]);
646
        p += hlens[i];
647
        buffer_len += hlens[i];
648
    }
649

    
650
    return p - *out;
651
}
652

    
653
static float get_floor_average(vorbis_enc_floor * fc, float *coeffs, int i)
654
{
655
    int begin = fc->list[fc->list[FFMAX(i-1, 0)].sort].x;
656
    int end   = fc->list[fc->list[FFMIN(i+1, fc->values - 1)].sort].x;
657
    int j;
658
    float average = 0;
659

    
660
    for (j = begin; j < end; j++)
661
        average += fabs(coeffs[j]);
662
    return average / (end - begin);
663
}
664

    
665
static void floor_fit(vorbis_enc_context *venc, vorbis_enc_floor *fc,
666
                      float *coeffs, uint_fast16_t *posts, int samples)
667
{
668
    int range = 255 / fc->multiplier + 1;
669
    int i;
670
    float tot_average = 0.;
671
    float averages[fc->values];
672
    for (i = 0; i < fc->values; i++) {
673
        averages[i] = get_floor_average(fc, coeffs, i);
674
        tot_average += averages[i];
675
    }
676
    tot_average /= fc->values;
677
    tot_average /= venc->quality;
678

    
679
    for (i = 0; i < fc->values; i++) {
680
        int position  = fc->list[fc->list[i].sort].x;
681
        float average = averages[i];
682
        int j;
683

    
684
        average *= pow(tot_average / average, 0.5) * pow(1.25, position/200.); // MAGIC!
685
        for (j = 0; j < range - 1; j++)
686
            if (ff_vorbis_floor1_inverse_db_table[j * fc->multiplier] > average)
687
                break;
688
        posts[fc->list[i].sort] = j;
689
    }
690
}
691

    
692
static int render_point(int x0, int y0, int x1, int y1, int x)
693
{
694
    return y0 +  (x - x0) * (y1 - y0) / (x1 - x0);
695
}
696

    
697
static void floor_encode(vorbis_enc_context *venc, vorbis_enc_floor *fc,
698
                         PutBitContext *pb, uint_fast16_t *posts,
699
                         float *floor, int samples)
700
{
701
    int range = 255 / fc->multiplier + 1;
702
    int coded[fc->values]; // first 2 values are unused
703
    int i, counter;
704

    
705
    put_bits(pb, 1, 1); // non zero
706
    put_bits(pb, ilog(range - 1), posts[0]);
707
    put_bits(pb, ilog(range - 1), posts[1]);
708
    coded[0] = coded[1] = 1;
709

    
710
    for (i = 2; i < fc->values; i++) {
711
        int predicted = render_point(fc->list[fc->list[i].low].x,
712
                                     posts[fc->list[i].low],
713
                                     fc->list[fc->list[i].high].x,
714
                                     posts[fc->list[i].high],
715
                                     fc->list[i].x);
716
        int highroom = range - predicted;
717
        int lowroom = predicted;
718
        int room = FFMIN(highroom, lowroom);
719
        if (predicted == posts[i]) {
720
            coded[i] = 0; // must be used later as flag!
721
            continue;
722
        } else {
723
            if (!coded[fc->list[i].low ])
724
                coded[fc->list[i].low ] = -1;
725
            if (!coded[fc->list[i].high])
726
                coded[fc->list[i].high] = -1;
727
        }
728
        if (posts[i] > predicted) {
729
            if (posts[i] - predicted > room)
730
                coded[i] = posts[i] - predicted + lowroom;
731
            else
732
                coded[i] = (posts[i] - predicted) << 1;
733
        } else {
734
            if (predicted - posts[i] > room)
735
                coded[i] = predicted - posts[i] + highroom - 1;
736
            else
737
                coded[i] = ((predicted - posts[i]) << 1) - 1;
738
        }
739
    }
740

    
741
    counter = 2;
742
    for (i = 0; i < fc->partitions; i++) {
743
        vorbis_enc_floor_class * c = &fc->classes[fc->partition_to_class[i]];
744
        int k, cval = 0, csub = 1<<c->subclass;
745
        if (c->subclass) {
746
            vorbis_enc_codebook * book = &venc->codebooks[c->masterbook];
747
            int cshift = 0;
748
            for (k = 0; k < c->dim; k++) {
749
                int l;
750
                for (l = 0; l < csub; l++) {
751
                    int maxval = 1;
752
                    if (c->books[l] != -1)
753
                        maxval = venc->codebooks[c->books[l]].nentries;
754
                    // coded could be -1, but this still works, cause that is 0
755
                    if (coded[counter + k] < maxval)
756
                        break;
757
                }
758
                assert(l != csub);
759
                cval   |= l << cshift;
760
                cshift += c->subclass;
761
            }
762
            put_codeword(pb, book, cval);
763
        }
764
        for (k = 0; k < c->dim; k++) {
765
            int book  = c->books[cval & (csub-1)];
766
            int entry = coded[counter++];
767
            cval >>= c->subclass;
768
            if (book == -1)
769
                continue;
770
            if (entry == -1)
771
                entry = 0;
772
            put_codeword(pb, &venc->codebooks[book], entry);
773
        }
774
    }
775

    
776
    ff_vorbis_floor1_render_list(fc->list, fc->values, posts, coded,
777
                                 fc->multiplier, floor, samples);
778
}
779

    
780
static float *put_vector(vorbis_enc_codebook *book, PutBitContext *pb,
781
                         float *num)
782
{
783
    int i, entry = -1;
784
    float distance = FLT_MAX;
785
    assert(book->dimentions);
786
    for (i = 0; i < book->nentries; i++) {
787
        float * vec = book->dimentions + i * book->ndimentions, d = book->pow2[i];
788
        int j;
789
        if (!book->lens[i])
790
            continue;
791
        for (j = 0; j < book->ndimentions; j++)
792
            d -= vec[j] * num[j];
793
        if (distance > d) {
794
            entry    = i;
795
            distance = d;
796
        }
797
    }
798
    put_codeword(pb, book, entry);
799
    return &book->dimentions[entry * book->ndimentions];
800
}
801

    
802
static void residue_encode(vorbis_enc_context *venc, vorbis_enc_residue *rc,
803
                           PutBitContext *pb, float *coeffs, int samples,
804
                           int real_ch)
805
{
806
    int pass, i, j, p, k;
807
    int psize      = rc->partition_size;
808
    int partitions = (rc->end - rc->begin) / psize;
809
    int channels   = (rc->type == 2) ? 1 : real_ch;
810
    int classes[channels][partitions];
811
    int classwords = venc->codebooks[rc->classbook].ndimentions;
812

    
813
    assert(rc->type == 2);
814
    assert(real_ch == 2);
815
    for (p = 0; p < partitions; p++) {
816
        float max1 = 0., max2 = 0.;
817
        int s = rc->begin + p * psize;
818
        for (k = s; k < s + psize; k += 2) {
819
            max1 = FFMAX(max1, fabs(coeffs[          k / real_ch]));
820
            max2 = FFMAX(max2, fabs(coeffs[samples + k / real_ch]));
821
        }
822

    
823
        for (i = 0; i < rc->classifications - 1; i++)
824
            if (max1 < rc->maxes[i][0] && max2 < rc->maxes[i][1])
825
                break;
826
        classes[0][p] = i;
827
    }
828

    
829
    for (pass = 0; pass < 8; pass++) {
830
        p = 0;
831
        while (p < partitions) {
832
            if (pass == 0)
833
                for (j = 0; j < channels; j++) {
834
                    vorbis_enc_codebook * book = &venc->codebooks[rc->classbook];
835
                    int entry = 0;
836
                    for (i = 0; i < classwords; i++) {
837
                        entry *= rc->classifications;
838
                        entry += classes[j][p + i];
839
                    }
840
                    put_codeword(pb, book, entry);
841
                }
842
            for (i = 0; i < classwords && p < partitions; i++, p++) {
843
                for (j = 0; j < channels; j++) {
844
                    int nbook = rc->books[classes[j][p]][pass];
845
                    vorbis_enc_codebook * book = &venc->codebooks[nbook];
846
                    float *buf = coeffs + samples*j + rc->begin + p*psize;
847
                    if (nbook == -1)
848
                        continue;
849

    
850
                    assert(rc->type == 0 || rc->type == 2);
851
                    assert(!(psize % book->ndimentions));
852

    
853
                    if (rc->type == 0) {
854
                        for (k = 0; k < psize; k += book->ndimentions) {
855
                            float *a = put_vector(book, pb, &buf[k]);
856
                            int l;
857
                            for (l = 0; l < book->ndimentions; l++)
858
                                buf[k + l] -= a[l];
859
                        }
860
                    } else {
861
                        int s = rc->begin + p * psize, a1, b1;
862
                        a1 = (s % real_ch) * samples;
863
                        b1 =  s / real_ch;
864
                        s  = real_ch * samples;
865
                        for (k = 0; k < psize; k += book->ndimentions) {
866
                            int dim, a2 = a1, b2 = b1;
867
                            float vec[book->ndimentions], *pv = vec;
868
                            for (dim = book->ndimentions; dim--; ) {
869
                                *pv++ = coeffs[a2 + b2];
870
                                if ((a2 += samples) == s) {
871
                                    a2 = 0;
872
                                    b2++;
873
                                }
874
                            }
875
                            pv = put_vector(book, pb, vec);
876
                            for (dim = book->ndimentions; dim--; ) {
877
                                coeffs[a1 + b1] -= *pv++;
878
                                if ((a1 += samples) == s) {
879
                                    a1 = 0;
880
                                    b1++;
881
                                }
882
                            }
883
                        }
884
                    }
885
                }
886
            }
887
        }
888
    }
889
}
890

    
891
static int apply_window_and_mdct(vorbis_enc_context *venc, signed short *audio,
892
                                 int samples)
893
{
894
    int i, j, channel;
895
    const float * win = venc->win[0];
896
    int window_len = 1 << (venc->log2_blocksize[0] - 1);
897
    float n = (float)(1 << venc->log2_blocksize[0]) / 4.;
898
    // FIXME use dsp
899

    
900
    if (!venc->have_saved && !samples)
901
        return 0;
902

    
903
    if (venc->have_saved) {
904
        for (channel = 0; channel < venc->channels; channel++)
905
            memcpy(venc->samples + channel * window_len * 2,
906
                   venc->saved + channel * window_len, sizeof(float) * window_len);
907
    } else {
908
        for (channel = 0; channel < venc->channels; channel++)
909
            memset(venc->samples + channel * window_len * 2, 0,
910
                   sizeof(float) * window_len);
911
    }
912

    
913
    if (samples) {
914
        for (channel = 0; channel < venc->channels; channel++) {
915
            float * offset = venc->samples + channel*window_len*2 + window_len;
916
            j = channel;
917
            for (i = 0; i < samples; i++, j += venc->channels)
918
                offset[i] = -audio[j] / 32768. / n * win[window_len - i - 1]; //FIXME find out why the sign has to be fliped
919
        }
920
    } else {
921
        for (channel = 0; channel < venc->channels; channel++)
922
            memset(venc->samples + channel * window_len * 2 + window_len,
923
                   0, sizeof(float) * window_len);
924
    }
925

    
926
    for (channel = 0; channel < venc->channels; channel++)
927
        ff_mdct_calc(&venc->mdct[0], venc->coeffs + channel * window_len,
928
                     venc->samples + channel * window_len * 2);
929

    
930
    if (samples) {
931
        for (channel = 0; channel < venc->channels; channel++) {
932
            float *offset = venc->saved + channel * window_len;
933
            j = channel;
934
            for (i = 0; i < samples; i++, j += venc->channels)
935
                offset[i] = -audio[j] / 32768. / n * win[i]; //FIXME find out why the sign has to be fliped
936
        }
937
        venc->have_saved = 1;
938
    } else {
939
        venc->have_saved = 0;
940
    }
941
    return 1;
942
}
943

    
944
static av_cold int vorbis_encode_init(AVCodecContext *avccontext)
945
{
946
    vorbis_enc_context *venc = avccontext->priv_data;
947

    
948
    if (avccontext->channels != 2) {
949
        av_log(avccontext, AV_LOG_ERROR, "Current FFmpeg Vorbis encoder only supports 2 channels.\n");
950
        return -1;
951
    }
952

    
953
    create_vorbis_context(venc, avccontext);
954

    
955
    if (avccontext->flags & CODEC_FLAG_QSCALE)
956
        venc->quality = avccontext->global_quality / (float)FF_QP2LAMBDA / 10.;
957
    else
958
        venc->quality = 1.;
959
    venc->quality *= venc->quality;
960

    
961
    avccontext->extradata_size = put_main_header(venc, (uint8_t**)&avccontext->extradata);
962

    
963
    avccontext->frame_size     = 1 << (venc->log2_blocksize[0] - 1);
964

    
965
    avccontext->coded_frame            = avcodec_alloc_frame();
966
    avccontext->coded_frame->key_frame = 1;
967

    
968
    return 0;
969
}
970

    
971
static int vorbis_encode_frame(AVCodecContext *avccontext,
972
                               unsigned char *packets,
973
                               int buf_size, void *data)
974
{
975
    vorbis_enc_context *venc = avccontext->priv_data;
976
    signed short *audio = data;
977
    int samples = data ? avccontext->frame_size : 0;
978
    vorbis_enc_mode *mode;
979
    vorbis_enc_mapping *mapping;
980
    PutBitContext pb;
981
    int i;
982

    
983
    if (!apply_window_and_mdct(venc, audio, samples))
984
        return 0;
985
    samples = 1 << (venc->log2_blocksize[0] - 1);
986

    
987
    init_put_bits(&pb, packets, buf_size);
988

    
989
    put_bits(&pb, 1, 0); // magic bit
990

    
991
    put_bits(&pb, ilog(venc->nmodes - 1), 0); // 0 bits, the mode
992

    
993
    mode    = &venc->modes[0];
994
    mapping = &venc->mappings[mode->mapping];
995
    if (mode->blockflag) {
996
        put_bits(&pb, 1, 0);
997
        put_bits(&pb, 1, 0);
998
    }
999

    
1000
    for (i = 0; i < venc->channels; i++) {
1001
        vorbis_enc_floor *fc = &venc->floors[mapping->floor[mapping->mux[i]]];
1002
        uint_fast16_t posts[fc->values];
1003
        floor_fit(venc, fc, &venc->coeffs[i * samples], posts, samples);
1004
        floor_encode(venc, fc, &pb, posts, &venc->floor[i * samples], samples);
1005
    }
1006

    
1007
    for (i = 0; i < venc->channels * samples; i++)
1008
        venc->coeffs[i] /= venc->floor[i];
1009

    
1010
    for (i = 0; i < mapping->coupling_steps; i++) {
1011
        float *mag = venc->coeffs + mapping->magnitude[i] * samples;
1012
        float *ang = venc->coeffs + mapping->angle[i]     * samples;
1013
        int j;
1014
        for (j = 0; j < samples; j++) {
1015
            float a = ang[j];
1016
            ang[j] -= mag[j];
1017
            if (mag[j] > 0)
1018
                ang[j] = -ang[j];
1019
            if (ang[j] < 0)
1020
                mag[j] = a;
1021
        }
1022
    }
1023

    
1024
    residue_encode(venc, &venc->residues[mapping->residue[mapping->mux[0]]],
1025
                   &pb, venc->coeffs, samples, venc->channels);
1026

    
1027
    avccontext->coded_frame->pts = venc->sample_count;
1028
    venc->sample_count += avccontext->frame_size;
1029
    flush_put_bits(&pb);
1030
    return put_bits_count(&pb) >> 3;
1031
}
1032

    
1033

    
1034
static av_cold int vorbis_encode_close(AVCodecContext *avccontext)
1035
{
1036
    vorbis_enc_context *venc = avccontext->priv_data;
1037
    int i;
1038

    
1039
    if (venc->codebooks)
1040
        for (i = 0; i < venc->ncodebooks; i++) {
1041
            av_freep(&venc->codebooks[i].lens);
1042
            av_freep(&venc->codebooks[i].codewords);
1043
            av_freep(&venc->codebooks[i].quantlist);
1044
            av_freep(&venc->codebooks[i].dimentions);
1045
            av_freep(&venc->codebooks[i].pow2);
1046
        }
1047
    av_freep(&venc->codebooks);
1048

    
1049
    if (venc->floors)
1050
        for (i = 0; i < venc->nfloors; i++) {
1051
            int j;
1052
            if (venc->floors[i].classes)
1053
                for (j = 0; j < venc->floors[i].nclasses; j++)
1054
                    av_freep(&venc->floors[i].classes[j].books);
1055
            av_freep(&venc->floors[i].classes);
1056
            av_freep(&venc->floors[i].partition_to_class);
1057
            av_freep(&venc->floors[i].list);
1058
        }
1059
    av_freep(&venc->floors);
1060

    
1061
    if (venc->residues)
1062
        for (i = 0; i < venc->nresidues; i++) {
1063
            av_freep(&venc->residues[i].books);
1064
            av_freep(&venc->residues[i].maxes);
1065
        }
1066
    av_freep(&venc->residues);
1067

    
1068
    if (venc->mappings)
1069
        for (i = 0; i < venc->nmappings; i++) {
1070
            av_freep(&venc->mappings[i].mux);
1071
            av_freep(&venc->mappings[i].floor);
1072
            av_freep(&venc->mappings[i].residue);
1073
            av_freep(&venc->mappings[i].magnitude);
1074
            av_freep(&venc->mappings[i].angle);
1075
        }
1076
    av_freep(&venc->mappings);
1077

    
1078
    av_freep(&venc->modes);
1079

    
1080
    av_freep(&venc->saved);
1081
    av_freep(&venc->samples);
1082
    av_freep(&venc->floor);
1083
    av_freep(&venc->coeffs);
1084

    
1085
    ff_mdct_end(&venc->mdct[0]);
1086
    ff_mdct_end(&venc->mdct[1]);
1087

    
1088
    av_freep(&avccontext->coded_frame);
1089
    av_freep(&avccontext->extradata);
1090

    
1091
    return 0 ;
1092
}
1093

    
1094
AVCodec vorbis_encoder = {
1095
    "vorbis",
1096
    AVMEDIA_TYPE_AUDIO,
1097
    CODEC_ID_VORBIS,
1098
    sizeof(vorbis_enc_context),
1099
    vorbis_encode_init,
1100
    vorbis_encode_frame,
1101
    vorbis_encode_close,
1102
    .capabilities= CODEC_CAP_DELAY,
1103
    .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
1104
    .long_name = NULL_IF_CONFIG_SMALL("Vorbis"),
1105
};