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1/*
2 * Opus encoder
3 * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "opus_celt.h"
23#include "opus_pvq.h"
24#include "opustab.h"
25
26#include "libavutil/float_dsp.h"
27#include "libavutil/opt.h"
28#include "internal.h"
29#include "bytestream.h"
30#include "audio_frame_queue.h"
31
32/* Determines the maximum delay the psychoacoustic system will use for lookahead */
33#define FF_BUFQUEUE_SIZE 145
34#include "libavfilter/bufferqueue.h"
35
36#define OPUS_MAX_LOOKAHEAD ((FF_BUFQUEUE_SIZE - 1)*2.5f)
37
38#define OPUS_MAX_CHANNELS 2
39
40/* 120 ms / 2.5 ms = 48 frames (extremely improbable, but the encoder'll work) */
41#define OPUS_MAX_FRAMES_PER_PACKET 48
42
43#define OPUS_BLOCK_SIZE(x) (2 * 15 * (1 << ((x) + 2)))
44
45#define OPUS_SAMPLES_TO_BLOCK_SIZE(x) (ff_log2((x) / (2 * 15)) - 2)
46
47typedef struct OpusEncOptions {
48 float max_delay_ms;
49} OpusEncOptions;
50
51typedef struct OpusEncContext {
52 AVClass *av_class;
53 OpusEncOptions options;
54 AVCodecContext *avctx;
55 AudioFrameQueue afq;
56 AVFloatDSPContext *dsp;
57 MDCT15Context *mdct[CELT_BLOCK_NB];
58 struct FFBufQueue bufqueue;
59
60 enum OpusMode mode;
61 enum OpusBandwidth bandwidth;
62 int pkt_framesize;
63 int pkt_frames;
64
65 int channels;
66
67 CeltFrame *frame;
68 OpusRangeCoder *rc;
69
70 /* Actual energy the decoder will have */
71 float last_quantized_energy[OPUS_MAX_CHANNELS][CELT_MAX_BANDS];
72
73 DECLARE_ALIGNED(32, float, scratch)[2048];
74} OpusEncContext;
75
76static void opus_write_extradata(AVCodecContext *avctx)
77{
78 uint8_t *bs = avctx->extradata;
79
80 bytestream_put_buffer(&bs, "OpusHead", 8);
81 bytestream_put_byte (&bs, 0x1);
82 bytestream_put_byte (&bs, avctx->channels);
83 bytestream_put_le16 (&bs, avctx->initial_padding);
84 bytestream_put_le32 (&bs, avctx->sample_rate);
85 bytestream_put_le16 (&bs, 0x0);
86 bytestream_put_byte (&bs, 0x0); /* Default layout */
87}
88
89static int opus_gen_toc(OpusEncContext *s, uint8_t *toc, int *size, int *fsize_needed)
90{
91 int i, tmp = 0x0, extended_toc = 0;
92 static const int toc_cfg[][OPUS_MODE_NB][OPUS_BANDWITH_NB] = {
93 /* Silk Hybrid Celt Layer */
94 /* NB MB WB SWB FB NB MB WB SWB FB NB MB WB SWB FB Bandwidth */
95 { { 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0 }, { 17, 0, 21, 25, 29 } }, /* 2.5 ms */
96 { { 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0 }, { 18, 0, 22, 26, 30 } }, /* 5 ms */
97 { { 1, 5, 9, 0, 0 }, { 0, 0, 0, 13, 15 }, { 19, 0, 23, 27, 31 } }, /* 10 ms */
98 { { 2, 6, 10, 0, 0 }, { 0, 0, 0, 14, 16 }, { 20, 0, 24, 28, 32 } }, /* 20 ms */
99 { { 3, 7, 11, 0, 0 }, { 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0 } }, /* 40 ms */
100 { { 4, 8, 12, 0, 0 }, { 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0 } }, /* 60 ms */
101 };
102 int cfg = toc_cfg[s->pkt_framesize][s->mode][s->bandwidth];
103 *fsize_needed = 0;
104 if (!cfg)
105 return 1;
106 if (s->pkt_frames == 2) { /* 2 packets */
107 if (s->frame[0].framebits == s->frame[1].framebits) { /* same size */
108 tmp = 0x1;
109 } else { /* different size */
110 tmp = 0x2;
111 *fsize_needed = 1; /* put frame sizes in the packet */
112 }
113 } else if (s->pkt_frames > 2) {
114 tmp = 0x3;
115 extended_toc = 1;
116 }
117 tmp |= (s->channels > 1) << 2; /* Stereo or mono */
118 tmp |= (cfg - 1) << 3; /* codec configuration */
119 *toc++ = tmp;
120 if (extended_toc) {
121 for (i = 0; i < (s->pkt_frames - 1); i++)
122 *fsize_needed |= (s->frame[i].framebits != s->frame[i + 1].framebits);
123 tmp = (*fsize_needed) << 7; /* vbr flag */
124 tmp |= s->pkt_frames; /* frame number - can be 0 as well */
125 *toc++ = tmp;
126 }
127 *size = 1 + extended_toc;
128 return 0;
129}
130
131static void celt_frame_setup_input(OpusEncContext *s, CeltFrame *f)
132{
133 int sf, ch;
134 AVFrame *cur = NULL;
135 const int subframesize = s->avctx->frame_size;
136 int subframes = OPUS_BLOCK_SIZE(s->pkt_framesize) / subframesize;
137
138 cur = ff_bufqueue_get(&s->bufqueue);
139
140 for (ch = 0; ch < f->channels; ch++) {
141 CeltBlock *b = &f->block[ch];
142 const void *input = cur->extended_data[ch];
143 size_t bps = av_get_bytes_per_sample(cur->format);
144 memcpy(b->overlap, input, bps*cur->nb_samples);
145 }
146
147 av_frame_free(&cur);
148
149 for (sf = 0; sf < subframes; sf++) {
150 if (sf != (subframes - 1))
151 cur = ff_bufqueue_get(&s->bufqueue);
152 else
153 cur = ff_bufqueue_peek(&s->bufqueue, 0);
154
155 for (ch = 0; ch < f->channels; ch++) {
156 CeltBlock *b = &f->block[ch];
157 const void *input = cur->extended_data[ch];
158 const size_t bps = av_get_bytes_per_sample(cur->format);
159 const size_t left = (subframesize - cur->nb_samples)*bps;
160 const size_t len = FFMIN(subframesize, cur->nb_samples)*bps;
161 memcpy(&b->samples[sf*subframesize], input, len);
162 memset(&b->samples[cur->nb_samples], 0, left);
163 }
164
165 /* Last frame isn't popped off and freed yet - we need it for overlap */
166 if (sf != (subframes - 1))
167 av_frame_free(&cur);
168 }
169}
170
171/* Apply the pre emphasis filter */
172static void celt_apply_preemph_filter(OpusEncContext *s, CeltFrame *f)
173{
174 int i, sf, ch;
175 const int subframesize = s->avctx->frame_size;
176 const int subframes = OPUS_BLOCK_SIZE(s->pkt_framesize) / subframesize;
177
178 /* Filter overlap */
179 for (ch = 0; ch < f->channels; ch++) {
180 CeltBlock *b = &f->block[ch];
181 float m = b->emph_coeff;
182 for (i = 0; i < CELT_OVERLAP; i++) {
183 float sample = b->overlap[i];
184 b->overlap[i] = sample - m;
185 m = sample * CELT_EMPH_COEFF;
186 }
187 b->emph_coeff = m;
188 }
189
190 /* Filter the samples but do not update the last subframe's coeff - overlap ^^^ */
191 for (sf = 0; sf < subframes; sf++) {
192 for (ch = 0; ch < f->channels; ch++) {
193 CeltBlock *b = &f->block[ch];
194 float m = b->emph_coeff;
195 for (i = 0; i < subframesize; i++) {
196 float sample = b->samples[sf*subframesize + i];
197 b->samples[sf*subframesize + i] = sample - m;
198 m = sample * CELT_EMPH_COEFF;
199 }
200 if (sf != (subframes - 1))
201 b->emph_coeff = m;
202 }
203 }
204}
205
206/* Create the window and do the mdct */
207static void celt_frame_mdct(OpusEncContext *s, CeltFrame *f)
208{
209 int i, t, ch;
210 float *win = s->scratch;
211
212 /* I think I can use s->dsp->vector_fmul_window for transients at least */
213 if (f->transient) {
214 for (ch = 0; ch < f->channels; ch++) {
215 CeltBlock *b = &f->block[ch];
216 float *src1 = b->overlap;
217 for (t = 0; t < f->blocks; t++) {
218 float *src2 = &b->samples[CELT_OVERLAP*t];
219 for (i = 0; i < CELT_OVERLAP; i++) {
220 win[ i] = src1[i]*ff_celt_window[i];
221 win[CELT_OVERLAP + i] = src2[i]*ff_celt_window[CELT_OVERLAP - i - 1];
222 }
223 src1 = src2;
224 s->mdct[0]->mdct(s->mdct[0], b->coeffs + t, win, f->blocks);
225 }
226 }
227 } else {
228 int blk_len = OPUS_BLOCK_SIZE(f->size), wlen = OPUS_BLOCK_SIZE(f->size + 1);
229 int rwin = blk_len - CELT_OVERLAP, lap_dst = (wlen - blk_len - CELT_OVERLAP) >> 1;
230 for (ch = 0; ch < f->channels; ch++) {
231 CeltBlock *b = &f->block[ch];
232
233 memset(win, 0, wlen*sizeof(float));
234
235 memcpy(&win[lap_dst + CELT_OVERLAP], b->samples, rwin*sizeof(float));
236
237 /* Alignment fucks me over */
238 //s->dsp->vector_fmul(&dst[lap_dst], b->overlap, ff_celt_window, CELT_OVERLAP);
239 //s->dsp->vector_fmul_reverse(&dst[lap_dst + blk_len - CELT_OVERLAP], b->samples, ff_celt_window, CELT_OVERLAP);
240
241 for (i = 0; i < CELT_OVERLAP; i++) {
242 win[lap_dst + i] = b->overlap[i] *ff_celt_window[i];
243 win[lap_dst + blk_len + i] = b->samples[rwin + i]*ff_celt_window[CELT_OVERLAP - i - 1];
244 }
245
246 s->mdct[f->size]->mdct(s->mdct[f->size], b->coeffs, win, 1);
247 }
248 }
249}
250
251/* Fills the bands and normalizes them */
252static int celt_frame_map_norm_bands(OpusEncContext *s, CeltFrame *f)
253{
254 int i, j, ch, noise = 0;
255
256 for (ch = 0; ch < f->channels; ch++) {
257 CeltBlock *block = &f->block[ch];
258 float *start = block->coeffs;
259 for (i = 0; i < CELT_MAX_BANDS; i++) {
260 float ener = 0.0f;
261
262 /* Calculate band bins */
263 block->band_bins[i] = ff_celt_freq_range[i] << f->size;
264 block->band_coeffs[i] = start;
265 start += block->band_bins[i];
266
267 /* Normalize band energy */
268 for (j = 0; j < block->band_bins[i]; j++)
269 ener += block->band_coeffs[i][j]*block->band_coeffs[i][j];
270
271 block->lin_energy[i] = sqrtf(ener) + FLT_EPSILON;
272 ener = 1.0f/block->lin_energy[i];
273
274 for (j = 0; j < block->band_bins[i]; j++)
275 block->band_coeffs[i][j] *= ener;
276
277 block->energy[i] = log2f(block->lin_energy[i]) - ff_celt_mean_energy[i];
278
279 /* CELT_ENERGY_SILENCE is what the decoder uses and its not -infinity */
280 block->energy[i] = FFMAX(block->energy[i], CELT_ENERGY_SILENCE);
281 noise |= block->energy[i] > CELT_ENERGY_SILENCE;
282 }
283 }
284 return !noise;
285}
286
287static void celt_enc_tf(OpusEncContext *s, OpusRangeCoder *rc, CeltFrame *f)
288{
289 int i, tf_select = 0, diff = 0, tf_changed = 0, tf_select_needed;
290 int bits = f->transient ? 2 : 4;
291
292 tf_select_needed = ((f->size && (opus_rc_tell(rc) + bits + 1) <= f->framebits));
293
294 for (i = f->start_band; i < f->end_band; i++) {
295 if ((opus_rc_tell(rc) + bits + tf_select_needed) <= f->framebits) {
296 const int tbit = (diff ^ 1) == f->tf_change[i];
297 ff_opus_rc_enc_log(rc, tbit, bits);
298 diff ^= tbit;
299 tf_changed |= diff;
300 }
301 bits = f->transient ? 4 : 5;
302 }
303
304 if (tf_select_needed && ff_celt_tf_select[f->size][f->transient][0][tf_changed] !=
305 ff_celt_tf_select[f->size][f->transient][1][tf_changed]) {
306 ff_opus_rc_enc_log(rc, f->tf_select, 1);
307 tf_select = f->tf_select;
308 }
309
310 for (i = f->start_band; i < f->end_band; i++)
311 f->tf_change[i] = ff_celt_tf_select[f->size][f->transient][tf_select][f->tf_change[i]];
312}
313
314static void celt_bitalloc(OpusEncContext *s, OpusRangeCoder *rc, CeltFrame *f)
315{
316 int i, j, low, high, total, done, bandbits, remaining, tbits_8ths;
317 int skip_startband = f->start_band;
318 int skip_bit = 0;
319 int intensitystereo_bit = 0;
320 int dualstereo_bit = 0;
321 int dynalloc = 6;
322 int extrabits = 0;
323
324 int *cap = f->caps;
325 int boost[CELT_MAX_BANDS];
326 int trim_offset[CELT_MAX_BANDS];
327 int threshold[CELT_MAX_BANDS];
328 int bits1[CELT_MAX_BANDS];
329 int bits2[CELT_MAX_BANDS];
330
331 /* Tell the spread to the decoder */
332 if (opus_rc_tell(rc) + 4 <= f->framebits)
333 ff_opus_rc_enc_cdf(rc, f->spread, ff_celt_model_spread);
334
335 /* Generate static allocation caps */
336 for (i = 0; i < CELT_MAX_BANDS; i++) {
337 cap[i] = (ff_celt_static_caps[f->size][f->channels - 1][i] + 64)
338 * ff_celt_freq_range[i] << (f->channels - 1) << f->size >> 2;
339 }
340
341 /* Band boosts */
342 tbits_8ths = f->framebits << 3;
343 for (i = f->start_band; i < f->end_band; i++) {
344 int quanta, b_dynalloc, boost_amount = f->alloc_boost[i];
345
346 boost[i] = 0;
347
348 quanta = ff_celt_freq_range[i] << (f->channels - 1) << f->size;
349 quanta = FFMIN(quanta << 3, FFMAX(6 << 3, quanta));
350 b_dynalloc = dynalloc;
351
352 while (opus_rc_tell_frac(rc) + (b_dynalloc << 3) < tbits_8ths && boost[i] < cap[i]) {
353 int is_boost = boost_amount--;
354
355 ff_opus_rc_enc_log(rc, is_boost, b_dynalloc);
356 if (!is_boost)
357 break;
358
359 boost[i] += quanta;
360 tbits_8ths -= quanta;
361
362 b_dynalloc = 1;
363 }
364
365 if (boost[i])
366 dynalloc = FFMAX(2, dynalloc - 1);
367 }
368
369 /* Put allocation trim */
370 if (opus_rc_tell_frac(rc) + (6 << 3) <= tbits_8ths)
371 ff_opus_rc_enc_cdf(rc, f->alloc_trim, ff_celt_model_alloc_trim);
372
373 /* Anti-collapse bit reservation */
374 tbits_8ths = (f->framebits << 3) - opus_rc_tell_frac(rc) - 1;
375 f->anticollapse_needed = 0;
376 if (f->transient && f->size >= 2 && tbits_8ths >= ((f->size + 2) << 3))
377 f->anticollapse_needed = 1 << 3;
378 tbits_8ths -= f->anticollapse_needed;
379
380 /* Band skip bit reservation */
381 if (tbits_8ths >= 1 << 3)
382 skip_bit = 1 << 3;
383 tbits_8ths -= skip_bit;
384
385 /* Intensity/dual stereo bit reservation */
386 if (f->channels == 2) {
387 intensitystereo_bit = ff_celt_log2_frac[f->end_band - f->start_band];
388 if (intensitystereo_bit <= tbits_8ths) {
389 tbits_8ths -= intensitystereo_bit;
390 if (tbits_8ths >= 1 << 3) {
391 dualstereo_bit = 1 << 3;
392 tbits_8ths -= 1 << 3;
393 }
394 } else {
395 intensitystereo_bit = 0;
396 }
397 }
398
399 /* Trim offsets */
400 for (i = f->start_band; i < f->end_band; i++) {
401 int trim = f->alloc_trim - 5 - f->size;
402 int band = ff_celt_freq_range[i] * (f->end_band - i - 1);
403 int duration = f->size + 3;
404 int scale = duration + f->channels - 1;
405
406 /* PVQ minimum allocation threshold, below this value the band is
407 * skipped */
408 threshold[i] = FFMAX(3 * ff_celt_freq_range[i] << duration >> 4,
409 f->channels << 3);
410
411 trim_offset[i] = trim * (band << scale) >> 6;
412
413 if (ff_celt_freq_range[i] << f->size == 1)
414 trim_offset[i] -= f->channels << 3;
415 }
416
417 /* Bisection */
418 low = 1;
419 high = CELT_VECTORS - 1;
420 while (low <= high) {
421 int center = (low + high) >> 1;
422 done = total = 0;
423
424 for (i = f->end_band - 1; i >= f->start_band; i--) {
425 bandbits = ff_celt_freq_range[i] * ff_celt_static_alloc[center][i]
426 << (f->channels - 1) << f->size >> 2;
427
428 if (bandbits)
429 bandbits = FFMAX(0, bandbits + trim_offset[i]);
430 bandbits += boost[i];
431
432 if (bandbits >= threshold[i] || done) {
433 done = 1;
434 total += FFMIN(bandbits, cap[i]);
435 } else if (bandbits >= f->channels << 3)
436 total += f->channels << 3;
437 }
438
439 if (total > tbits_8ths)
440 high = center - 1;
441 else
442 low = center + 1;
443 }
444 high = low--;
445
446 /* Bisection */
447 for (i = f->start_band; i < f->end_band; i++) {
448 bits1[i] = ff_celt_freq_range[i] * ff_celt_static_alloc[low][i]
449 << (f->channels - 1) << f->size >> 2;
450 bits2[i] = high >= CELT_VECTORS ? cap[i] :
451 ff_celt_freq_range[i] * ff_celt_static_alloc[high][i]
452 << (f->channels - 1) << f->size >> 2;
453
454 if (bits1[i])
455 bits1[i] = FFMAX(0, bits1[i] + trim_offset[i]);
456 if (bits2[i])
457 bits2[i] = FFMAX(0, bits2[i] + trim_offset[i]);
458 if (low)
459 bits1[i] += boost[i];
460 bits2[i] += boost[i];
461
462 if (boost[i])
463 skip_startband = i;
464 bits2[i] = FFMAX(0, bits2[i] - bits1[i]);
465 }
466
467 /* Bisection */
468 low = 0;
469 high = 1 << CELT_ALLOC_STEPS;
470 for (i = 0; i < CELT_ALLOC_STEPS; i++) {
471 int center = (low + high) >> 1;
472 done = total = 0;
473
474 for (j = f->end_band - 1; j >= f->start_band; j--) {
475 bandbits = bits1[j] + (center * bits2[j] >> CELT_ALLOC_STEPS);
476
477 if (bandbits >= threshold[j] || done) {
478 done = 1;
479 total += FFMIN(bandbits, cap[j]);
480 } else if (bandbits >= f->channels << 3)
481 total += f->channels << 3;
482 }
483 if (total > tbits_8ths)
484 high = center;
485 else
486 low = center;
487 }
488
489 /* Bisection */
490 done = total = 0;
491 for (i = f->end_band - 1; i >= f->start_band; i--) {
492 bandbits = bits1[i] + (low * bits2[i] >> CELT_ALLOC_STEPS);
493
494 if (bandbits >= threshold[i] || done)
495 done = 1;
496 else
497 bandbits = (bandbits >= f->channels << 3) ?
498 f->channels << 3 : 0;
499
500 bandbits = FFMIN(bandbits, cap[i]);
501 f->pulses[i] = bandbits;
502 total += bandbits;
503 }
504
505 /* Band skipping */
506 for (f->coded_bands = f->end_band; ; f->coded_bands--) {
507 int allocation;
508 j = f->coded_bands - 1;
509
510 if (j == skip_startband) {
511 /* all remaining bands are not skipped */
512 tbits_8ths += skip_bit;
513 break;
514 }
515
516 /* determine the number of bits available for coding "do not skip" markers */
517 remaining = tbits_8ths - total;
518 bandbits = remaining / (ff_celt_freq_bands[j+1] - ff_celt_freq_bands[f->start_band]);
519 remaining -= bandbits * (ff_celt_freq_bands[j+1] - ff_celt_freq_bands[f->start_band]);
520 allocation = f->pulses[j] + bandbits * ff_celt_freq_range[j]
521 + FFMAX(0, remaining - (ff_celt_freq_bands[j] - ff_celt_freq_bands[f->start_band]));
522
523 /* a "do not skip" marker is only coded if the allocation is
524 above the chosen threshold */
525 if (allocation >= FFMAX(threshold[j], (f->channels + 1) << 3)) {
526 const int do_not_skip = f->coded_bands <= f->skip_band_floor;
527 ff_opus_rc_enc_log(rc, do_not_skip, 1);
528 if (do_not_skip)
529 break;
530
531 total += 1 << 3;
532 allocation -= 1 << 3;
533 }
534
535 /* the band is skipped, so reclaim its bits */
536 total -= f->pulses[j];
537 if (intensitystereo_bit) {
538 total -= intensitystereo_bit;
539 intensitystereo_bit = ff_celt_log2_frac[j - f->start_band];
540 total += intensitystereo_bit;
541 }
542
543 total += f->pulses[j] = (allocation >= f->channels << 3) ? f->channels << 3 : 0;
544 }
545
546 /* Encode stereo flags */
547 if (intensitystereo_bit) {
548 f->intensity_stereo = FFMIN(f->intensity_stereo, f->coded_bands);
549 ff_opus_rc_enc_uint(rc, f->intensity_stereo, f->coded_bands + 1 - f->start_band);
550 }
551 if (f->intensity_stereo <= f->start_band)
552 tbits_8ths += dualstereo_bit; /* no intensity stereo means no dual stereo */
553 else if (dualstereo_bit)
554 ff_opus_rc_enc_log(rc, f->dual_stereo, 1);
555
556 /* Supply the remaining bits in this frame to lower bands */
557 remaining = tbits_8ths - total;
558 bandbits = remaining / (ff_celt_freq_bands[f->coded_bands] - ff_celt_freq_bands[f->start_band]);
559 remaining -= bandbits * (ff_celt_freq_bands[f->coded_bands] - ff_celt_freq_bands[f->start_band]);
560 for (i = f->start_band; i < f->coded_bands; i++) {
561 int bits = FFMIN(remaining, ff_celt_freq_range[i]);
562
563 f->pulses[i] += bits + bandbits * ff_celt_freq_range[i];
564 remaining -= bits;
565 }
566
567 /* Finally determine the allocation */
568 for (i = f->start_band; i < f->coded_bands; i++) {
569 int N = ff_celt_freq_range[i] << f->size;
570 int prev_extra = extrabits;
571 f->pulses[i] += extrabits;
572
573 if (N > 1) {
574 int dof; // degrees of freedom
575 int temp; // dof * channels * log(dof)
576 int offset; // fine energy quantization offset, i.e.
577 // extra bits assigned over the standard
578 // totalbits/dof
579 int fine_bits, max_bits;
580
581 extrabits = FFMAX(0, f->pulses[i] - cap[i]);
582 f->pulses[i] -= extrabits;
583
584 /* intensity stereo makes use of an extra degree of freedom */
585 dof = N * f->channels + (f->channels == 2 && N > 2 && !f->dual_stereo && i < f->intensity_stereo);
586 temp = dof * (ff_celt_log_freq_range[i] + (f->size << 3));
587 offset = (temp >> 1) - dof * CELT_FINE_OFFSET;
588 if (N == 2) /* dof=2 is the only case that doesn't fit the model */
589 offset += dof << 1;
590
591 /* grant an additional bias for the first and second pulses */
592 if (f->pulses[i] + offset < 2 * (dof << 3))
593 offset += temp >> 2;
594 else if (f->pulses[i] + offset < 3 * (dof << 3))
595 offset += temp >> 3;
596
597 fine_bits = (f->pulses[i] + offset + (dof << 2)) / (dof << 3);
598 max_bits = FFMIN((f->pulses[i] >> 3) >> (f->channels - 1), CELT_MAX_FINE_BITS);
599
600 max_bits = FFMAX(max_bits, 0);
601
602 f->fine_bits[i] = av_clip(fine_bits, 0, max_bits);
603
604 /* if fine_bits was rounded down or capped,
605 give priority for the final fine energy pass */
606 f->fine_priority[i] = (f->fine_bits[i] * (dof << 3) >= f->pulses[i] + offset);
607
608 /* the remaining bits are assigned to PVQ */
609 f->pulses[i] -= f->fine_bits[i] << (f->channels - 1) << 3;
610 } else {
611 /* all bits go to fine energy except for the sign bit */
612 extrabits = FFMAX(0, f->pulses[i] - (f->channels << 3));
613 f->pulses[i] -= extrabits;
614 f->fine_bits[i] = 0;
615 f->fine_priority[i] = 1;
616 }
617
618 /* hand back a limited number of extra fine energy bits to this band */
619 if (extrabits > 0) {
620 int fineextra = FFMIN(extrabits >> (f->channels + 2),
621 CELT_MAX_FINE_BITS - f->fine_bits[i]);
622 f->fine_bits[i] += fineextra;
623
624 fineextra <<= f->channels + 2;
625 f->fine_priority[i] = (fineextra >= extrabits - prev_extra);
626 extrabits -= fineextra;
627 }
628 }
629 f->remaining = extrabits;
630
631 /* skipped bands dedicate all of their bits for fine energy */
632 for (; i < f->end_band; i++) {
633 f->fine_bits[i] = f->pulses[i] >> (f->channels - 1) >> 3;
634 f->pulses[i] = 0;
635 f->fine_priority[i] = f->fine_bits[i] < 1;
636 }
637}
638
639static void celt_quant_coarse(OpusEncContext *s, OpusRangeCoder *rc, CeltFrame *f)
640{
641 int i, ch;
642 float alpha, beta, prev[2] = { 0, 0 };
643 const uint8_t *pmod = ff_celt_coarse_energy_dist[f->size][f->intra];
644
645 /* Inter is really just differential coding */
646 if (opus_rc_tell(rc) + 3 <= f->framebits)
647 ff_opus_rc_enc_log(rc, f->intra, 3);
648 else
649 f->intra = 0;
650
651 if (f->intra) {
652 alpha = 0.0f;
653 beta = 1.0f - 4915.0f/32768.0f;
654 } else {
655 alpha = ff_celt_alpha_coef[f->size];
656 beta = 1.0f - ff_celt_beta_coef[f->size];
657 }
658
659 for (i = f->start_band; i < f->end_band; i++) {
660 for (ch = 0; ch < f->channels; ch++) {
661 CeltBlock *block = &f->block[ch];
662 const int left = f->framebits - opus_rc_tell(rc);
663 const float last = FFMAX(-9.0f, s->last_quantized_energy[ch][i]);
664 float diff = block->energy[i] - prev[ch] - last*alpha;
665 int q_en = lrintf(diff);
666 if (left >= 15) {
667 ff_opus_rc_enc_laplace(rc, &q_en, pmod[i << 1] << 7, pmod[(i << 1) + 1] << 6);
668 } else if (left >= 2) {
669 q_en = av_clip(q_en, -1, 1);
670 ff_opus_rc_enc_cdf(rc, 2*q_en + 3*(q_en < 0), ff_celt_model_energy_small);
671 } else if (left >= 1) {
672 q_en = av_clip(q_en, -1, 0);
673 ff_opus_rc_enc_log(rc, (q_en & 1), 1);
674 } else q_en = -1;
675
676 block->error_energy[i] = q_en - diff;
677 prev[ch] += beta * q_en;
678 }
679 }
680}
681
682static void celt_quant_fine(OpusEncContext *s, OpusRangeCoder *rc, CeltFrame *f)
683{
684 int i, ch;
685 for (i = f->start_band; i < f->end_band; i++) {
686 if (!f->fine_bits[i])
687 continue;
688 for (ch = 0; ch < f->channels; ch++) {
689 CeltBlock *block = &f->block[ch];
690 int quant, lim = (1 << f->fine_bits[i]);
691 float offset, diff = 0.5f - block->error_energy[i];
692 quant = av_clip(floor(diff*lim), 0, lim - 1);
693 ff_opus_rc_put_raw(rc, quant, f->fine_bits[i]);
694 offset = 0.5f - ((quant + 0.5f) * (1 << (14 - f->fine_bits[i])) / 16384.0f);
695 block->error_energy[i] -= offset;
696 }
697 }
698}
699
700static void celt_quant_final(OpusEncContext *s, OpusRangeCoder *rc, CeltFrame *f)
701{
702 int i, ch, priority;
703 for (priority = 0; priority < 2; priority++) {
704 for (i = f->start_band; i < f->end_band && (f->framebits - opus_rc_tell(rc)) >= f->channels; i++) {
705 if (f->fine_priority[i] != priority || f->fine_bits[i] >= CELT_MAX_FINE_BITS)
706 continue;
707 for (ch = 0; ch < f->channels; ch++) {
708 CeltBlock *block = &f->block[ch];
709 const float err = block->error_energy[i];
710 const float offset = 0.5f * (1 << (14 - f->fine_bits[i] - 1)) / 16384.0f;
711 const int sign = FFABS(err + offset) < FFABS(err - offset);
712 ff_opus_rc_put_raw(rc, sign, 1);
713 block->error_energy[i] -= offset*(1 - 2*sign);
714 }
715 }
716 }
717}
718
719static void celt_quant_bands(OpusEncContext *s, OpusRangeCoder *rc, CeltFrame *f)
720{
721 float lowband_scratch[8 * 22];
722 float norm[2 * 8 * 100];
723
724 int totalbits = (f->framebits << 3) - f->anticollapse_needed;
725
726 int update_lowband = 1;
727 int lowband_offset = 0;
728
729 int i, j;
730
731 for (i = f->start_band; i < f->end_band; i++) {
732 int band_offset = ff_celt_freq_bands[i] << f->size;
733 int band_size = ff_celt_freq_range[i] << f->size;
734 float *X = f->block[0].coeffs + band_offset;
735 float *Y = (f->channels == 2) ? f->block[1].coeffs + band_offset : NULL;
736
737 int consumed = opus_rc_tell_frac(rc);
738 float *norm2 = norm + 8 * 100;
739 int effective_lowband = -1;
740 unsigned int cm[2];
741 int b;
742
743 /* Compute how many bits we want to allocate to this band */
744 if (i != f->start_band)
745 f->remaining -= consumed;
746 f->remaining2 = totalbits - consumed - 1;
747 if (i <= f->coded_bands - 1) {
748 int curr_balance = f->remaining / FFMIN(3, f->coded_bands-i);
749 b = av_clip_uintp2(FFMIN(f->remaining2 + 1, f->pulses[i] + curr_balance), 14);
750 } else
751 b = 0;
752
753 if (ff_celt_freq_bands[i] - ff_celt_freq_range[i] >= ff_celt_freq_bands[f->start_band] &&
754 (update_lowband || lowband_offset == 0))
755 lowband_offset = i;
756
757 /* Get a conservative estimate of the collapse_mask's for the bands we're
758 going to be folding from. */
759 if (lowband_offset != 0 && (f->spread != CELT_SPREAD_AGGRESSIVE ||
760 f->blocks > 1 || f->tf_change[i] < 0)) {
761 int foldstart, foldend;
762
763 /* This ensures we never repeat spectral content within one band */
764 effective_lowband = FFMAX(ff_celt_freq_bands[f->start_band],
765 ff_celt_freq_bands[lowband_offset] - ff_celt_freq_range[i]);
766 foldstart = lowband_offset;
767 while (ff_celt_freq_bands[--foldstart] > effective_lowband);
768 foldend = lowband_offset - 1;
769 while (ff_celt_freq_bands[++foldend] < effective_lowband + ff_celt_freq_range[i]);
770
771 cm[0] = cm[1] = 0;
772 for (j = foldstart; j < foldend; j++) {
773 cm[0] |= f->block[0].collapse_masks[j];
774 cm[1] |= f->block[f->channels - 1].collapse_masks[j];
775 }
776 } else
777 /* Otherwise, we'll be using the LCG to fold, so all blocks will (almost
778 always) be non-zero.*/
779 cm[0] = cm[1] = (1 << f->blocks) - 1;
780
781 if (f->dual_stereo && i == f->intensity_stereo) {
782 /* Switch off dual stereo to do intensity */
783 f->dual_stereo = 0;
784 for (j = ff_celt_freq_bands[f->start_band] << f->size; j < band_offset; j++)
785 norm[j] = (norm[j] + norm2[j]) / 2;
786 }
787
788 if (f->dual_stereo) {
789 cm[0] = ff_celt_encode_band(f, rc, i, X, NULL, band_size, b / 2, f->blocks,
790 effective_lowband != -1 ? norm + (effective_lowband << f->size) : NULL, f->size,
791 norm + band_offset, 0, 1.0f, lowband_scratch, cm[0]);
792
793 cm[1] = ff_celt_encode_band(f, rc, i, Y, NULL, band_size, b/2, f->blocks,
794 effective_lowband != -1 ? norm2 + (effective_lowband << f->size) : NULL, f->size,
795 norm2 + band_offset, 0, 1.0f, lowband_scratch, cm[1]);
796 } else {
797 cm[0] = ff_celt_encode_band(f, rc, i, X, Y, band_size, b, f->blocks,
798 effective_lowband != -1 ? norm + (effective_lowband << f->size) : NULL, f->size,
799 norm + band_offset, 0, 1.0f, lowband_scratch, cm[0]|cm[1]);
800 cm[1] = cm[0];
801 }
802
803 f->block[0].collapse_masks[i] = (uint8_t)cm[0];
804 f->block[f->channels - 1].collapse_masks[i] = (uint8_t)cm[1];
805 f->remaining += f->pulses[i] + consumed;
806
807 /* Update the folding position only as long as we have 1 bit/sample depth */
808 update_lowband = (b > band_size << 3);
809 }
810}
811
812static void celt_encode_frame(OpusEncContext *s, OpusRangeCoder *rc, CeltFrame *f)
813{
814 int i, ch;
815
816 celt_frame_setup_input(s, f);
817 celt_apply_preemph_filter(s, f);
818 if (f->pfilter) {
819 /* Not implemented */
820 }
821 celt_frame_mdct(s, f);
822 f->silence = celt_frame_map_norm_bands(s, f);
823 if (f->silence) {
824 f->framebits = 1;
825 return;
826 }
827
828 ff_opus_rc_enc_log(rc, f->silence, 15);
829
830 if (!f->start_band && opus_rc_tell(rc) + 16 <= f->framebits)
831 ff_opus_rc_enc_log(rc, f->pfilter, 1);
832
833 if (f->pfilter) {
834 /* Not implemented */
835 }
836
837 if (f->size && opus_rc_tell(rc) + 3 <= f->framebits)
838 ff_opus_rc_enc_log(rc, f->transient, 3);
839
840 celt_quant_coarse (s, rc, f);
841 celt_enc_tf (s, rc, f);
842 celt_bitalloc (s, rc, f);
843 celt_quant_fine (s, rc, f);
844 celt_quant_bands (s, rc, f);
845
846 if (f->anticollapse_needed)
847 ff_opus_rc_put_raw(rc, f->anticollapse, 1);
848
849 celt_quant_final(s, rc, f);
850
851 for (ch = 0; ch < f->channels; ch++) {
852 CeltBlock *block = &f->block[ch];
853 for (i = 0; i < CELT_MAX_BANDS; i++)
854 s->last_quantized_energy[ch][i] = block->energy[i] + block->error_energy[i];
855 }
856}
857
858static void ff_opus_psy_process(OpusEncContext *s, int end, int *need_more)
859{
860 int max_delay_samples = (s->options.max_delay_ms*s->avctx->sample_rate)/1000;
861 int max_bsize = FFMIN(OPUS_SAMPLES_TO_BLOCK_SIZE(max_delay_samples), CELT_BLOCK_960);
862
863 s->pkt_frames = 1;
864 s->pkt_framesize = max_bsize;
865 s->mode = OPUS_MODE_CELT;
866 s->bandwidth = OPUS_BANDWIDTH_FULLBAND;
867
868 *need_more = s->bufqueue.available*s->avctx->frame_size < (max_delay_samples + CELT_OVERLAP);
869 /* Don't request more if we start being flushed with NULL frames */
870 *need_more = !end && *need_more;
871}
872
873static void ff_opus_psy_celt_frame_setup(OpusEncContext *s, CeltFrame *f, int index)
874{
875 int frame_size = OPUS_BLOCK_SIZE(s->pkt_framesize);
876
877 f->avctx = s->avctx;
878 f->dsp = s->dsp;
879 f->start_band = (s->mode == OPUS_MODE_HYBRID) ? 17 : 0;
880 f->end_band = ff_celt_band_end[s->bandwidth];
881 f->channels = s->channels;
882 f->size = s->pkt_framesize;
883
884 /* Decisions */
885 f->silence = 0;
886 f->pfilter = 0;
887 f->transient = 0;
888 f->intra = 1;
889 f->tf_select = 0;
890 f->anticollapse = 0;
891 f->alloc_trim = 5;
892 f->skip_band_floor = f->end_band;
893 f->intensity_stereo = f->end_band;
894 f->dual_stereo = 0;
895 f->spread = CELT_SPREAD_NORMAL;
896 memset(f->tf_change, 0, sizeof(int)*CELT_MAX_BANDS);
897 memset(f->alloc_boost, 0, sizeof(int)*CELT_MAX_BANDS);
898
899 f->blocks = f->transient ? frame_size/CELT_OVERLAP : 1;
900 f->framebits = FFALIGN(lrintf((double)s->avctx->bit_rate/(s->avctx->sample_rate/frame_size)), 8);
901}
902
903static void opus_packet_assembler(OpusEncContext *s, AVPacket *avpkt)
904{
905 int i, offset, fsize_needed;
906
907 /* Write toc */
908 opus_gen_toc(s, avpkt->data, &offset, &fsize_needed);
909
910 for (i = 0; i < s->pkt_frames; i++) {
911 ff_opus_rc_enc_end(&s->rc[i], avpkt->data + offset, s->frame[i].framebits >> 3);
912 offset += s->frame[i].framebits >> 3;
913 }
914
915 avpkt->size = offset;
916}
917
918/* Used as overlap for the first frame and padding for the last encoded packet */
919static AVFrame *spawn_empty_frame(OpusEncContext *s)
920{
921 int i;
922 AVFrame *f = av_frame_alloc();
923 if (!f)
924 return NULL;
925 f->format = s->avctx->sample_fmt;
926 f->nb_samples = s->avctx->frame_size;
927 f->channel_layout = s->avctx->channel_layout;
928 if (av_frame_get_buffer(f, 4)) {
929 av_frame_free(&f);
930 return NULL;
931 }
932 for (i = 0; i < s->channels; i++) {
933 size_t bps = av_get_bytes_per_sample(f->format);
934 memset(f->extended_data[i], 0, bps*f->nb_samples);
935 }
936 return f;
937}
938
939static int opus_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
940 const AVFrame *frame, int *got_packet_ptr)
941{
942 OpusEncContext *s = avctx->priv_data;
943 int i, ret, frame_size, need_more, alloc_size = 0;
944
945 if (frame) { /* Add new frame to queue */
946 if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
947 return ret;
948 ff_bufqueue_add(avctx, &s->bufqueue, av_frame_clone(frame));
949 } else {
950 if (!s->afq.remaining_samples)
951 return 0; /* We've been flushed and there's nothing left to encode */
952 }
953
954 /* Run the psychoacoustic system */
955 ff_opus_psy_process(s, !frame, &need_more);
956
957 /* Get more samples for lookahead/encoding */
958 if (need_more)
959 return 0;
960
961 frame_size = OPUS_BLOCK_SIZE(s->pkt_framesize);
962
963 if (!frame) {
964 /* This can go negative, that's not a problem, we only pad if positive */
965 int pad_empty = s->pkt_frames*(frame_size/s->avctx->frame_size) - s->bufqueue.available + 1;
966 /* Pad with empty 2.5 ms frames to whatever framesize was decided,
967 * this should only happen at the very last flush frame. The frames
968 * allocated here will be freed (because they have no other references)
969 * after they get used by celt_frame_setup_input() */
970 for (i = 0; i < pad_empty; i++) {
971 AVFrame *empty = spawn_empty_frame(s);
972 if (!empty)
973 return AVERROR(ENOMEM);
974 ff_bufqueue_add(avctx, &s->bufqueue, empty);
975 }
976 }
977
978 for (i = 0; i < s->pkt_frames; i++) {
979 ff_opus_rc_enc_init(&s->rc[i]);
980 ff_opus_psy_celt_frame_setup(s, &s->frame[i], i);
981 celt_encode_frame(s, &s->rc[i], &s->frame[i]);
982 alloc_size += s->frame[i].framebits >> 3;
983 }
984
985 /* Worst case toc + the frame lengths if needed */
986 alloc_size += 2 + s->pkt_frames*2;
987
988 if ((ret = ff_alloc_packet2(avctx, avpkt, alloc_size, 0)) < 0)
989 return ret;
990
991 /* Assemble packet */
992 opus_packet_assembler(s, avpkt);
993
994 /* Remove samples from queue and skip if needed */
995 ff_af_queue_remove(&s->afq, s->pkt_frames*frame_size, &avpkt->pts, &avpkt->duration);
996 if (s->pkt_frames*frame_size > avpkt->duration) {
997 uint8_t *side = av_packet_new_side_data(avpkt, AV_PKT_DATA_SKIP_SAMPLES, 10);
998 if (!side)
999 return AVERROR(ENOMEM);
1000 AV_WL32(&side[4], s->pkt_frames*frame_size - avpkt->duration + 120);
1001 }
1002
1003 *got_packet_ptr = 1;
1004
1005 return 0;
1006}
1007
1008static av_cold int opus_encode_end(AVCodecContext *avctx)
1009{
1010 int i;
1011 OpusEncContext *s = avctx->priv_data;
1012
1013 for (i = 0; i < CELT_BLOCK_NB; i++)
1014 ff_mdct15_uninit(&s->mdct[i]);
1015
1016 av_freep(&s->dsp);
1017 av_freep(&s->frame);
1018 av_freep(&s->rc);
1019 ff_af_queue_close(&s->afq);
1020 ff_bufqueue_discard_all(&s->bufqueue);
1021 av_freep(&avctx->extradata);
1022
1023 return 0;
1024}
1025
1026static av_cold int opus_encode_init(AVCodecContext *avctx)
1027{
1028 int i, ch, ret;
1029 OpusEncContext *s = avctx->priv_data;
1030
1031 s->avctx = avctx;
1032 s->channels = avctx->channels;
1033
1034 /* Opus allows us to change the framesize on each packet (and each packet may
1035 * have multiple frames in it) but we can't change the codec's frame size on
1036 * runtime, so fix it to the lowest possible number of samples and use a queue
1037 * to accumulate AVFrames until we have enough to encode whatever the encoder
1038 * decides is the best */
1039 avctx->frame_size = 120;
1040 /* Initial padding will change if SILK is ever supported */
1041 avctx->initial_padding = 120;
1042
1043 avctx->cutoff = !avctx->cutoff ? 20000 : avctx->cutoff;
1044
1045 if (!avctx->bit_rate) {
1046 int coupled = ff_opus_default_coupled_streams[s->channels - 1];
1047 avctx->bit_rate = coupled*(96000) + (s->channels - coupled*2)*(48000);
1048 } else if (avctx->bit_rate < 6000 || avctx->bit_rate > 255000 * s->channels) {
1049 int64_t clipped_rate = av_clip(avctx->bit_rate, 6000, 255000 * s->channels);
1050 av_log(avctx, AV_LOG_ERROR, "Unsupported bitrate %"PRId64" kbps, clipping to %"PRId64" kbps\n",
1051 avctx->bit_rate/1000, clipped_rate/1000);
1052 avctx->bit_rate = clipped_rate;
1053 }
1054
1055 /* Frame structs and range coder buffers */
1056 s->frame = av_malloc(OPUS_MAX_FRAMES_PER_PACKET*sizeof(CeltFrame));
1057 if (!s->frame)
1058 return AVERROR(ENOMEM);
1059 s->rc = av_malloc(OPUS_MAX_FRAMES_PER_PACKET*sizeof(OpusRangeCoder));
1060 if (!s->rc)
1061 return AVERROR(ENOMEM);
1062
1063 /* Extradata */
1064 avctx->extradata_size = 19;
1065 avctx->extradata = av_malloc(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
1066 if (!avctx->extradata)
1067 return AVERROR(ENOMEM);
1068 opus_write_extradata(avctx);
1069
1070 ff_af_queue_init(avctx, &s->afq);
1071
1072 if (!(s->dsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT)))
1073 return AVERROR(ENOMEM);
1074
1075 /* I have no idea why a base scaling factor of 68 works, could be the twiddles */
1076 for (i = 0; i < CELT_BLOCK_NB; i++)
1077 if ((ret = ff_mdct15_init(&s->mdct[i], 0, i + 3, 68 << (CELT_BLOCK_NB - 1 - i))))
1078 return AVERROR(ENOMEM);
1079
1080 for (i = 0; i < OPUS_MAX_FRAMES_PER_PACKET; i++)
1081 s->frame[i].block[0].emph_coeff = s->frame[i].block[1].emph_coeff = 0.0f;
1082
1083 /* Zero out previous energy (matters for inter first frame) */
1084 for (ch = 0; ch < s->channels; ch++)
1085 for (i = 0; i < CELT_MAX_BANDS; i++)
1086 s->last_quantized_energy[ch][i] = 0.0f;
1087
1088 /* Allocate an empty frame to use as overlap for the first frame of audio */
1089 ff_bufqueue_add(avctx, &s->bufqueue, spawn_empty_frame(s));
1090 if (!ff_bufqueue_peek(&s->bufqueue, 0))
1091 return AVERROR(ENOMEM);
1092
1093 return 0;
1094}
1095
1096#define OPUSENC_FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
1097static const AVOption opusenc_options[] = {
1098 { "opus_delay", "Maximum delay (and lookahead) in milliseconds", offsetof(OpusEncContext, options.max_delay_ms), AV_OPT_TYPE_FLOAT, { .dbl = OPUS_MAX_LOOKAHEAD }, 2.5f, OPUS_MAX_LOOKAHEAD, OPUSENC_FLAGS },
1099 { NULL },
1100};
1101
1102static const AVClass opusenc_class = {
1103 .class_name = "Opus encoder",
1104 .item_name = av_default_item_name,
1105 .option = opusenc_options,
1106 .version = LIBAVUTIL_VERSION_INT,
1107};
1108
1109static const AVCodecDefault opusenc_defaults[] = {
1110 { "b", "0" },
1111 { "compression_level", "10" },
1112 { NULL },
1113};
1114
1115AVCodec ff_opus_encoder = {
1116 .name = "opus",
1117 .long_name = NULL_IF_CONFIG_SMALL("Opus"),
1118 .type = AVMEDIA_TYPE_AUDIO,
1119 .id = AV_CODEC_ID_OPUS,
1120 .defaults = opusenc_defaults,
1121 .priv_class = &opusenc_class,
1122 .priv_data_size = sizeof(OpusEncContext),
1123 .init = opus_encode_init,
1124 .encode2 = opus_encode_frame,
1125 .close = opus_encode_end,
1126 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
1127 .capabilities = AV_CODEC_CAP_EXPERIMENTAL | AV_CODEC_CAP_SMALL_LAST_FRAME | AV_CODEC_CAP_DELAY,
1128 .supported_samplerates = (const int []){ 48000, 0 },
1129 .channel_layouts = (const uint64_t []){ AV_CH_LAYOUT_MONO,
1130 AV_CH_LAYOUT_STEREO, 0 },
1131 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
1132 AV_SAMPLE_FMT_NONE },
1133};
1134
generated by cgit at 2024-05-17 06:11:51 (GMT)