GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/opus_celt.c Lines: 293 315 93.0 %
Date: 2019-11-18 18:00:01 Branches: 190 208 91.3 %

Line Branch Exec Source
1
/*
2
 * Copyright (c) 2012 Andrew D'Addesio
3
 * Copyright (c) 2013-2014 Mozilla Corporation
4
 * Copyright (c) 2016 Rostislav Pehlivanov <atomnuker@gmail.com>
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22
23
/**
24
 * @file
25
 * Opus CELT decoder
26
 */
27
28
#include "opus_celt.h"
29
#include "opustab.h"
30
#include "opus_pvq.h"
31
32
/* Use the 2D z-transform to apply prediction in both the time domain (alpha)
33
 * and the frequency domain (beta) */
34
29869
static void celt_decode_coarse_energy(CeltFrame *f, OpusRangeCoder *rc)
35
{
36
    int i, j;
37
29869
    float prev[2] = { 0 };
38
29869
    float alpha = ff_celt_alpha_coef[f->size];
39
29869
    float beta  = ff_celt_beta_coef[f->size];
40
29869
    const uint8_t *model = ff_celt_coarse_energy_dist[f->size][0];
41
42
    /* intra frame */
43

29869
    if (opus_rc_tell(rc) + 3 <= f->framebits && ff_opus_rc_dec_log(rc, 3)) {
44
5873
        alpha = 0.0f;
45
5873
        beta  = 1.0f - (4915.0f/32768.0f);
46
5873
        model = ff_celt_coarse_energy_dist[f->size][1];
47
    }
48
49
657118
    for (i = 0; i < CELT_MAX_BANDS; i++) {
50
1647849
        for (j = 0; j < f->channels; j++) {
51
1020600
            CeltBlock *block = &f->block[j];
52
            float value;
53
            int available;
54
55

1020600
            if (i < f->start_band || i >= f->end_band) {
56
170908
                block->energy[i] = 0.0;
57
170908
                continue;
58
            }
59
60
849692
            available = f->framebits - opus_rc_tell(rc);
61
849692
            if (available >= 15) {
62
                /* decode using a Laplace distribution */
63
845898
                int k = FFMIN(i, 20) << 1;
64
845898
                value = ff_opus_rc_dec_laplace(rc, model[k] << 7, model[k+1] << 6);
65
3794
            } else if (available >= 2) {
66
113
                int x = ff_opus_rc_dec_cdf(rc, ff_celt_model_energy_small);
67
113
                value = (x>>1) ^ -(x&1);
68
3681
            } else if (available >= 1) {
69
3
                value = -(float)ff_opus_rc_dec_log(rc, 1);
70
3678
            } else value = -1;
71
72
849692
            block->energy[i] = FFMAX(-9.0f, block->energy[i]) * alpha + prev[j] + value;
73
849692
            prev[j] += beta * value;
74
        }
75
    }
76
29869
}
77
78
29869
static void celt_decode_fine_energy(CeltFrame *f, OpusRangeCoder *rc)
79
{
80
    int i;
81
537903
    for (i = f->start_band; i < f->end_band; i++) {
82
        int j;
83
508034
        if (!f->fine_bits[i])
84
95330
            continue;
85
86
1094007
        for (j = 0; j < f->channels; j++) {
87
681303
            CeltBlock *block = &f->block[j];
88
            int q2;
89
            float offset;
90
681303
            q2 = ff_opus_rc_get_raw(rc, f->fine_bits[i]);
91
681303
            offset = (q2 + 0.5f) * (1 << (14 - f->fine_bits[i])) / 16384.0f - 0.5f;
92
681303
            block->energy[i] += offset;
93
        }
94
    }
95
29869
}
96
97
29869
static void celt_decode_final_energy(CeltFrame *f, OpusRangeCoder *rc)
98
{
99
    int priority, i, j;
100
29869
    int bits_left = f->framebits - opus_rc_tell(rc);
101
102
89607
    for (priority = 0; priority < 2; priority++) {
103

162460
        for (i = f->start_band; i < f->end_band && bits_left >= f->channels; i++) {
104

102722
            if (f->fine_priority[i] != priority || f->fine_bits[i] >= CELT_MAX_FINE_BITS)
105
65402
                continue;
106
107
96124
            for (j = 0; j < f->channels; j++) {
108
                int q2;
109
                float offset;
110
58804
                q2 = ff_opus_rc_get_raw(rc, 1);
111
58804
                offset = (q2 - 0.5f) * (1 << (14 - f->fine_bits[i] - 1)) / 16384.0f;
112
58804
                f->block[j].energy[i] += offset;
113
58804
                bits_left--;
114
            }
115
        }
116
    }
117
29869
}
118
119
29869
static void celt_decode_tf_changes(CeltFrame *f, OpusRangeCoder *rc)
120
{
121
29869
    int i, diff = 0, tf_select = 0, tf_changed = 0, tf_select_bit;
122
29869
    int consumed, bits = f->transient ? 2 : 4;
123
124
29869
    consumed = opus_rc_tell(rc);
125

29869
    tf_select_bit = (f->size != 0 && consumed+bits+1 <= f->framebits);
126
127
537903
    for (i = f->start_band; i < f->end_band; i++) {
128
508034
        if (consumed+bits+tf_select_bit <= f->framebits) {
129
505558
            diff ^= ff_opus_rc_dec_log(rc, bits);
130
505558
            consumed = opus_rc_tell(rc);
131
505558
            tf_changed |= diff;
132
        }
133
508034
        f->tf_change[i] = diff;
134
508034
        bits = f->transient ? 4 : 5;
135
    }
136
137
29869
    if (tf_select_bit && ff_celt_tf_select[f->size][f->transient][0][tf_changed] !=
138
16071
                         ff_celt_tf_select[f->size][f->transient][1][tf_changed])
139
8088
        tf_select = ff_opus_rc_dec_log(rc, 1);
140
141
537903
    for (i = f->start_band; i < f->end_band; i++) {
142
508034
        f->tf_change[i] = ff_celt_tf_select[f->size][f->transient][tf_select][f->tf_change[i]];
143
    }
144
29869
}
145
146
48600
static void celt_denormalize(CeltFrame *f, CeltBlock *block, float *data)
147
{
148
    int i, j;
149
150
898292
    for (i = f->start_band; i < f->end_band; i++) {
151
849692
        float *dst = data + (ff_celt_freq_bands[i] << f->size);
152
849692
        float log_norm = block->energy[i] + ff_celt_mean_energy[i];
153
849692
        float norm = exp2f(FFMIN(log_norm, 32.0f));
154
155
13154552
        for (j = 0; j < ff_celt_freq_range[i] << f->size; j++)
156
12304860
            dst[j] *= norm;
157
    }
158
48600
}
159
160
89012
static void celt_postfilter_apply_transition(CeltBlock *block, float *data)
161
{
162
89012
    const int T0 = block->pf_period_old;
163
89012
    const int T1 = block->pf_period;
164
165
    float g00, g01, g02;
166
    float g10, g11, g12;
167
168
    float x0, x1, x2, x3, x4;
169
170
    int i;
171
172
89012
    if (block->pf_gains[0]     == 0.0 &&
173
41570
        block->pf_gains_old[0] == 0.0)
174
37390
        return;
175
176
51622
    g00 = block->pf_gains_old[0];
177
51622
    g01 = block->pf_gains_old[1];
178
51622
    g02 = block->pf_gains_old[2];
179
51622
    g10 = block->pf_gains[0];
180
51622
    g11 = block->pf_gains[1];
181
51622
    g12 = block->pf_gains[2];
182
183
51622
    x1 = data[-T1 + 1];
184
51622
    x2 = data[-T1];
185
51622
    x3 = data[-T1 - 1];
186
51622
    x4 = data[-T1 - 2];
187
188
6246262
    for (i = 0; i < CELT_OVERLAP; i++) {
189
6194640
        float w = ff_celt_window2[i];
190
6194640
        x0 = data[i - T1 + 2];
191
192
6194640
        data[i] +=  (1.0 - w) * g00 * data[i - T0]                          +
193
6194640
                    (1.0 - w) * g01 * (data[i - T0 - 1] + data[i - T0 + 1]) +
194
6194640
                    (1.0 - w) * g02 * (data[i - T0 - 2] + data[i - T0 + 2]) +
195
6194640
                    w         * g10 * x2                                    +
196
6194640
                    w         * g11 * (x1 + x3)                             +
197
6194640
                    w         * g12 * (x0 + x4);
198
6194640
        x4 = x3;
199
6194640
        x3 = x2;
200
6194640
        x2 = x1;
201
6194640
        x1 = x0;
202
    }
203
}
204
205
56678
static void celt_postfilter(CeltFrame *f, CeltBlock *block)
206
{
207
56678
    int len = f->blocksize * f->blocks;
208
56678
    const int filter_len = len - 2 * CELT_OVERLAP;
209
210
56678
    celt_postfilter_apply_transition(block, block->buf + 1024);
211
212
56678
    block->pf_period_old = block->pf_period;
213
56678
    memcpy(block->pf_gains_old, block->pf_gains, sizeof(block->pf_gains));
214
215
56678
    block->pf_period = block->pf_period_new;
216
56678
    memcpy(block->pf_gains, block->pf_gains_new, sizeof(block->pf_gains));
217
218
56678
    if (len > CELT_OVERLAP) {
219
32334
        celt_postfilter_apply_transition(block, block->buf + 1024 + CELT_OVERLAP);
220
221

32334
        if (block->pf_gains[0] > FLT_EPSILON && filter_len > 0)
222
10124
            f->opusdsp.postfilter(block->buf + 1024 + 2 * CELT_OVERLAP,
223
10124
                                  block->pf_period, block->pf_gains,
224
                                  filter_len);
225
226
32334
        block->pf_period_old = block->pf_period;
227
32334
        memcpy(block->pf_gains_old, block->pf_gains, sizeof(block->pf_gains));
228
    }
229
230
56678
    memmove(block->buf, block->buf + len, (1024 + CELT_OVERLAP / 2) * sizeof(float));
231
56678
}
232
233
29869
static int parse_postfilter(CeltFrame *f, OpusRangeCoder *rc, int consumed)
234
{
235
    int i;
236
237
29869
    memset(f->block[0].pf_gains_new, 0, sizeof(f->block[0].pf_gains_new));
238
29869
    memset(f->block[1].pf_gains_new, 0, sizeof(f->block[1].pf_gains_new));
239
240

29869
    if (f->start_band == 0 && consumed + 16 <= f->framebits) {
241
24809
        int has_postfilter = ff_opus_rc_dec_log(rc, 1);
242
24809
        if (has_postfilter) {
243
            float gain;
244
            int tapset, octave, period;
245
246
15873
            octave = ff_opus_rc_dec_uint(rc, 6);
247
15873
            period = (16 << octave) + ff_opus_rc_get_raw(rc, 4 + octave) - 1;
248
15873
            gain   = 0.09375f * (ff_opus_rc_get_raw(rc, 3) + 1);
249
15873
            tapset = (opus_rc_tell(rc) + 2 <= f->framebits) ?
250
15873
                     ff_opus_rc_dec_cdf(rc, ff_celt_model_tapset) : 0;
251
252
47619
            for (i = 0; i < 2; i++) {
253
31746
                CeltBlock *block = &f->block[i];
254
255
31746
                block->pf_period_new = FFMAX(period, CELT_POSTFILTER_MINPERIOD);
256
31746
                block->pf_gains_new[0] = gain * ff_celt_postfilter_taps[tapset][0];
257
31746
                block->pf_gains_new[1] = gain * ff_celt_postfilter_taps[tapset][1];
258
31746
                block->pf_gains_new[2] = gain * ff_celt_postfilter_taps[tapset][2];
259
            }
260
        }
261
262
24809
        consumed = opus_rc_tell(rc);
263
    }
264
265
29869
    return consumed;
266
}
267
268
2750
static void process_anticollapse(CeltFrame *f, CeltBlock *block, float *X)
269
{
270
    int i, j, k;
271
272
37875
    for (i = f->start_band; i < f->end_band; i++) {
273
35125
        int renormalize = 0;
274
        float *xptr;
275
        float prev[2];
276
        float Ediff, r;
277
        float thresh, sqrt_1;
278
        int depth;
279
280
        /* depth in 1/8 bits */
281
35125
        depth = (1 + f->pulses[i]) / (ff_celt_freq_range[i] << f->size);
282
35125
        thresh = exp2f(-1.0 - 0.125f * depth);
283
35125
        sqrt_1 = 1.0f / sqrtf(ff_celt_freq_range[i] << f->size);
284
285
35125
        xptr = X + (ff_celt_freq_bands[i] << f->size);
286
287
35125
        prev[0] = block->prev_energy[0][i];
288
35125
        prev[1] = block->prev_energy[1][i];
289
35125
        if (f->channels == 1) {
290
9975
            CeltBlock *block1 = &f->block[1];
291
292
9975
            prev[0] = FFMAX(prev[0], block1->prev_energy[0][i]);
293
9975
            prev[1] = FFMAX(prev[1], block1->prev_energy[1][i]);
294
        }
295
35125
        Ediff = block->energy[i] - FFMIN(prev[0], prev[1]);
296
35125
        Ediff = FFMAX(0, Ediff);
297
298
        /* r needs to be multiplied by 2 or 2*sqrt(2) depending on LM because
299
        short blocks don't have the same energy as long */
300
35125
        r = exp2f(1 - Ediff);
301
35125
        if (f->size == 3)
302
23564
            r *= M_SQRT2;
303
35125
        r = FFMIN(thresh, r) * sqrt_1;
304
269881
        for (k = 0; k < 1 << f->size; k++) {
305
            /* Detect collapse */
306
234756
            if (!(block->collapse_masks[i] & 1 << k)) {
307
                /* Fill with noise */
308
115623
                for (j = 0; j < ff_celt_freq_range[i]; j++)
309
95928
                    xptr[(j << f->size) + k] = (celt_rng(f) & 0x8000) ? r : -r;
310
19695
                renormalize = 1;
311
            }
312
        }
313
314
        /* We just added some energy, so we need to renormalize */
315
35125
        if (renormalize)
316
8458
            celt_renormalize_vector(xptr, ff_celt_freq_range[i] << f->size, 1.0f);
317
    }
318
2750
}
319
320
29869
int ff_celt_decode_frame(CeltFrame *f, OpusRangeCoder *rc,
321
                         float **output, int channels, int frame_size,
322
                         int start_band,  int end_band)
323
{
324
29869
    int i, j, downmix = 0;
325
    int consumed;           // bits of entropy consumed thus far for this frame
326
    MDCT15Context *imdct;
327
328

29869
    if (channels != 1 && channels != 2) {
329
        av_log(f->avctx, AV_LOG_ERROR, "Invalid number of coded channels: %d\n",
330
               channels);
331
        return AVERROR_INVALIDDATA;
332
    }
333

29869
    if (start_band < 0 || start_band > end_band || end_band > CELT_MAX_BANDS) {
334
        av_log(f->avctx, AV_LOG_ERROR, "Invalid start/end band: %d %d\n",
335
               start_band, end_band);
336
        return AVERROR_INVALIDDATA;
337
    }
338
339
29869
    f->silence        = 0;
340
29869
    f->transient      = 0;
341
29869
    f->anticollapse   = 0;
342
29869
    f->flushed        = 0;
343
29869
    f->channels       = channels;
344
29869
    f->start_band     = start_band;
345
29869
    f->end_band       = end_band;
346
29869
    f->framebits      = rc->rb.bytes * 8;
347
348
29869
    f->size = av_log2(frame_size / CELT_SHORT_BLOCKSIZE);
349
29869
    if (f->size > CELT_MAX_LOG_BLOCKS ||
350
29869
        frame_size != CELT_SHORT_BLOCKSIZE * (1 << f->size)) {
351
        av_log(f->avctx, AV_LOG_ERROR, "Invalid CELT frame size: %d\n",
352
               frame_size);
353
        return AVERROR_INVALIDDATA;
354
    }
355
356
29869
    if (!f->output_channels)
357
        f->output_channels = channels;
358
359
78469
    for (i = 0; i < f->channels; i++) {
360
48600
        memset(f->block[i].coeffs,         0, sizeof(f->block[i].coeffs));
361
48600
        memset(f->block[i].collapse_masks, 0, sizeof(f->block[i].collapse_masks));
362
    }
363
364
29869
    consumed = opus_rc_tell(rc);
365
366
    /* obtain silence flag */
367
29869
    if (consumed >= f->framebits)
368
        f->silence = 1;
369
29869
    else if (consumed == 1)
370
24934
        f->silence = ff_opus_rc_dec_log(rc, 15);
371
372
373
29869
    if (f->silence) {
374
125
        consumed = f->framebits;
375
125
        rc->total_bits += f->framebits - opus_rc_tell(rc);
376
    }
377
378
    /* obtain post-filter options */
379
29869
    consumed = parse_postfilter(f, rc, consumed);
380
381
    /* obtain transient flag */
382

29869
    if (f->size != 0 && consumed+3 <= f->framebits)
383
16079
        f->transient = ff_opus_rc_dec_log(rc, 3);
384
385
29869
    f->blocks    = f->transient ? 1 << f->size : 1;
386
29869
    f->blocksize = frame_size / f->blocks;
387
388
29869
    imdct = f->imdct[f->transient ? 0 : f->size];
389
390
29869
    if (channels == 1) {
391
245036
        for (i = 0; i < CELT_MAX_BANDS; i++)
392
233898
            f->block[0].energy[i] = FFMAX(f->block[0].energy[i], f->block[1].energy[i]);
393
    }
394
395
29869
    celt_decode_coarse_energy(f, rc);
396
29869
    celt_decode_tf_changes   (f, rc);
397
29869
    ff_celt_bitalloc         (f, rc, 0);
398
29869
    celt_decode_fine_energy  (f, rc);
399
29869
    ff_celt_quant_bands      (f, rc);
400
401
29869
    if (f->anticollapse_needed)
402
3123
        f->anticollapse = ff_opus_rc_get_raw(rc, 1);
403
404
29869
    celt_decode_final_energy(f, rc);
405
406
    /* apply anti-collapse processing and denormalization to
407
     * each coded channel */
408
78469
    for (i = 0; i < f->channels; i++) {
409
48600
        CeltBlock *block = &f->block[i];
410
411
48600
        if (f->anticollapse)
412
2750
            process_anticollapse(f, block, f->block[i].coeffs);
413
414
48600
        celt_denormalize(f, block, f->block[i].coeffs);
415
    }
416
417
    /* stereo -> mono downmix */
418
29869
    if (f->output_channels < f->channels) {
419
        f->dsp->vector_fmac_scalar(f->block[0].coeffs, f->block[1].coeffs, 1.0, FFALIGN(frame_size, 16));
420
        downmix = 1;
421
29869
    } else if (f->output_channels > f->channels)
422
8078
        memcpy(f->block[1].coeffs, f->block[0].coeffs, frame_size * sizeof(float));
423
424
29869
    if (f->silence) {
425
375
        for (i = 0; i < 2; i++) {
426
250
            CeltBlock *block = &f->block[i];
427
428
5500
            for (j = 0; j < FF_ARRAY_ELEMS(block->energy); j++)
429
5250
                block->energy[j] = CELT_ENERGY_SILENCE;
430
        }
431
125
        memset(f->block[0].coeffs, 0, sizeof(f->block[0].coeffs));
432
125
        memset(f->block[1].coeffs, 0, sizeof(f->block[1].coeffs));
433
    }
434
435
    /* transform and output for each output channel */
436
86547
    for (i = 0; i < f->output_channels; i++) {
437
56678
        CeltBlock *block = &f->block[i];
438
439
        /* iMDCT and overlap-add */
440
149134
        for (j = 0; j < f->blocks; j++) {
441
92456
            float *dst  = block->buf + 1024 + j * f->blocksize;
442
443
92456
            imdct->imdct_half(imdct, dst + CELT_OVERLAP / 2, f->block[i].coeffs + j,
444
92456
                              f->blocks);
445
92456
            f->dsp->vector_fmul_window(dst, dst, dst + CELT_OVERLAP / 2,
446
                                       ff_celt_window, CELT_OVERLAP / 2);
447
        }
448
449
56678
        if (downmix)
450
            f->dsp->vector_fmul_scalar(&block->buf[1024], &block->buf[1024], 0.5f, frame_size);
451
452
        /* postfilter */
453
56678
        celt_postfilter(f, block);
454
455
        /* deemphasis */
456
56678
        block->emph_coeff = f->opusdsp.deemphasis(output[i],
457
56678
                                                  &block->buf[1024 - frame_size],
458
                                                  block->emph_coeff, frame_size);
459
    }
460
461
29869
    if (channels == 1)
462
11138
        memcpy(f->block[1].energy, f->block[0].energy, sizeof(f->block[0].energy));
463
464
89607
    for (i = 0; i < 2; i++ ) {
465
59738
        CeltBlock *block = &f->block[i];
466
467
59738
        if (!f->transient) {
468
51720
            memcpy(block->prev_energy[1], block->prev_energy[0], sizeof(block->prev_energy[0]));
469
51720
            memcpy(block->prev_energy[0], block->energy,         sizeof(block->prev_energy[0]));
470
        } else {
471
176396
            for (j = 0; j < CELT_MAX_BANDS; j++)
472
168378
                block->prev_energy[0][j] = FFMIN(block->prev_energy[0][j], block->energy[j]);
473
        }
474
475
227528
        for (j = 0; j < f->start_band; j++) {
476
167790
            block->prev_energy[0][j] = CELT_ENERGY_SILENCE;
477
167790
            block->energy[j]         = 0.0;
478
        }
479
130378
        for (j = f->end_band; j < CELT_MAX_BANDS; j++) {
480
70640
            block->prev_energy[0][j] = CELT_ENERGY_SILENCE;
481
70640
            block->energy[j]         = 0.0;
482
        }
483
    }
484
485
29869
    f->seed = rc->range;
486
487
29869
    return 0;
488
}
489
490
4597
void ff_celt_flush(CeltFrame *f)
491
{
492
    int i, j;
493
494
4597
    if (f->flushed)
495
4533
        return;
496
497
192
    for (i = 0; i < 2; i++) {
498
128
        CeltBlock *block = &f->block[i];
499
500
2816
        for (j = 0; j < CELT_MAX_BANDS; j++)
501
2688
            block->prev_energy[0][j] = block->prev_energy[1][j] = CELT_ENERGY_SILENCE;
502
503
128
        memset(block->energy, 0, sizeof(block->energy));
504
128
        memset(block->buf,    0, sizeof(block->buf));
505
506
128
        memset(block->pf_gains,     0, sizeof(block->pf_gains));
507
128
        memset(block->pf_gains_old, 0, sizeof(block->pf_gains_old));
508
128
        memset(block->pf_gains_new, 0, sizeof(block->pf_gains_new));
509
510
        /* libopus uses CELT_EMPH_COEFF on init, but 0 is better since there's
511
         * a lesser discontinuity when seeking.
512
         * The deemphasis functions differ from libopus in that they require
513
         * an initial state divided by the coefficient. */
514
128
        block->emph_coeff = 0.0f / CELT_EMPH_COEFF;
515
    }
516
64
    f->seed = 0;
517
518
64
    f->flushed = 1;
519
}
520
521
41
void ff_celt_free(CeltFrame **f)
522
{
523
41
    CeltFrame *frm = *f;
524
    int i;
525
526
41
    if (!frm)
527
        return;
528
529
205
    for (i = 0; i < FF_ARRAY_ELEMS(frm->imdct); i++)
530
164
        ff_mdct15_uninit(&frm->imdct[i]);
531
532
41
    ff_celt_pvq_uninit(&frm->pvq);
533
534
41
    av_freep(&frm->dsp);
535
41
    av_freep(f);
536
}
537
538
41
int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels,
539
                 int apply_phase_inv)
540
{
541
    CeltFrame *frm;
542
    int i, ret;
543
544

41
    if (output_channels != 1 && output_channels != 2) {
545
        av_log(avctx, AV_LOG_ERROR, "Invalid number of output channels: %d\n",
546
               output_channels);
547
        return AVERROR(EINVAL);
548
    }
549
550
41
    frm = av_mallocz(sizeof(*frm));
551
41
    if (!frm)
552
        return AVERROR(ENOMEM);
553
554
41
    frm->avctx           = avctx;
555
41
    frm->output_channels = output_channels;
556
41
    frm->apply_phase_inv = apply_phase_inv;
557
558
205
    for (i = 0; i < FF_ARRAY_ELEMS(frm->imdct); i++)
559
164
        if ((ret = ff_mdct15_init(&frm->imdct[i], 1, i + 3, -1.0f/32768)) < 0)
560
            goto fail;
561
562
41
    if ((ret = ff_celt_pvq_init(&frm->pvq, 0)) < 0)
563
        goto fail;
564
565
41
    frm->dsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
566
41
    if (!frm->dsp) {
567
        ret = AVERROR(ENOMEM);
568
        goto fail;
569
    }
570
571
41
    ff_opus_dsp_init(&frm->opusdsp);
572
41
    ff_celt_flush(frm);
573
574
41
    *f = frm;
575
576
41
    return 0;
577
fail:
578
    ff_celt_free(&frm);
579
    return ret;
580
}