1/* 2 * Opus encoder using libopus 3 * Copyright (c) 2012 Nathan Caldwell 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.h> 23#include <opus_multistream.h> 24 25#include "libavutil/channel_layout.h" 26#include "libavutil/opt.h" 27#include "avcodec.h" 28#include "bytestream.h" 29#include "codec_internal.h" 30#include "encode.h" 31#include "libopus.h" 32#include "vorbis.h" 33#include "audio_frame_queue.h" 34 35typedef struct LibopusEncOpts { 36 int vbr; 37 int application; 38 int packet_loss; 39 int fec; 40 int complexity; 41 float frame_duration; 42 int packet_size; 43 int max_bandwidth; 44 int mapping_family; 45#ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST 46 int apply_phase_inv; 47#endif 48} LibopusEncOpts; 49 50typedef struct LibopusEncContext { 51 AVClass *class; 52 OpusMSEncoder *enc; 53 int stream_count; 54 uint8_t *samples; 55 LibopusEncOpts opts; 56 AudioFrameQueue afq; 57 const uint8_t *encoder_channel_map; 58} LibopusEncContext; 59 60static const uint8_t opus_coupled_streams[8] = { 61 0, 1, 1, 2, 2, 2, 2, 3 62}; 63 64/* Opus internal to Vorbis channel order mapping written in the header */ 65static const uint8_t opus_vorbis_channel_map[8][8] = { 66 { 0 }, 67 { 0, 1 }, 68 { 0, 2, 1 }, 69 { 0, 1, 2, 3 }, 70 { 0, 4, 1, 2, 3 }, 71 { 0, 4, 1, 2, 3, 5 }, 72 { 0, 4, 1, 2, 3, 5, 6 }, 73 { 0, 6, 1, 2, 3, 4, 5, 7 }, 74}; 75 76/* libavcodec to libopus channel order mapping, passed to libopus */ 77static const uint8_t libavcodec_libopus_channel_map[8][8] = { 78 { 0 }, 79 { 0, 1 }, 80 { 0, 1, 2 }, 81 { 0, 1, 2, 3 }, 82 { 0, 1, 3, 4, 2 }, 83 { 0, 1, 4, 5, 2, 3 }, 84 { 0, 1, 5, 6, 2, 4, 3 }, 85 { 0, 1, 6, 7, 4, 5, 2, 3 }, 86}; 87 88static void libopus_write_header(AVCodecContext *avctx, int stream_count, 89 int coupled_stream_count, 90 int mapping_family, 91 const uint8_t *channel_mapping) 92{ 93 uint8_t *p = avctx->extradata; 94 int channels = avctx->ch_layout.nb_channels; 95 96 bytestream_put_buffer(&p, "OpusHead", 8); 97 bytestream_put_byte(&p, 1); /* Version */ 98 bytestream_put_byte(&p, channels); 99 bytestream_put_le16(&p, avctx->initial_padding * 48000 / avctx->sample_rate); /* Lookahead samples at 48kHz */ 100 bytestream_put_le32(&p, avctx->sample_rate); /* Original sample rate */ 101 bytestream_put_le16(&p, 0); /* Gain of 0dB is recommended. */ 102 103 /* Channel mapping */ 104 bytestream_put_byte(&p, mapping_family); 105 if (mapping_family != 0) { 106 bytestream_put_byte(&p, stream_count); 107 bytestream_put_byte(&p, coupled_stream_count); 108 bytestream_put_buffer(&p, channel_mapping, channels); 109 } 110} 111 112static int libopus_configure_encoder(AVCodecContext *avctx, OpusMSEncoder *enc, 113 LibopusEncOpts *opts) 114{ 115 int ret; 116 117 if (avctx->global_quality) { 118 av_log(avctx, AV_LOG_ERROR, 119 "Quality-based encoding not supported, " 120 "please specify a bitrate and VBR setting.\n"); 121 return AVERROR(EINVAL); 122 } 123 124 ret = opus_multistream_encoder_ctl(enc, OPUS_SET_BITRATE(avctx->bit_rate)); 125 if (ret != OPUS_OK) { 126 av_log(avctx, AV_LOG_ERROR, 127 "Failed to set bitrate: %s\n", opus_strerror(ret)); 128 return ret; 129 } 130 131 ret = opus_multistream_encoder_ctl(enc, 132 OPUS_SET_COMPLEXITY(opts->complexity)); 133 if (ret != OPUS_OK) 134 av_log(avctx, AV_LOG_WARNING, 135 "Unable to set complexity: %s\n", opus_strerror(ret)); 136 137 ret = opus_multistream_encoder_ctl(enc, OPUS_SET_VBR(!!opts->vbr)); 138 if (ret != OPUS_OK) 139 av_log(avctx, AV_LOG_WARNING, 140 "Unable to set VBR: %s\n", opus_strerror(ret)); 141 142 ret = opus_multistream_encoder_ctl(enc, 143 OPUS_SET_VBR_CONSTRAINT(opts->vbr == 2)); 144 if (ret != OPUS_OK) 145 av_log(avctx, AV_LOG_WARNING, 146 "Unable to set constrained VBR: %s\n", opus_strerror(ret)); 147 148 ret = opus_multistream_encoder_ctl(enc, 149 OPUS_SET_PACKET_LOSS_PERC(opts->packet_loss)); 150 if (ret != OPUS_OK) 151 av_log(avctx, AV_LOG_WARNING, 152 "Unable to set expected packet loss percentage: %s\n", 153 opus_strerror(ret)); 154 155 ret = opus_multistream_encoder_ctl(enc, 156 OPUS_SET_INBAND_FEC(opts->fec)); 157 if (ret != OPUS_OK) 158 av_log(avctx, AV_LOG_WARNING, 159 "Unable to set inband FEC: %s\n", 160 opus_strerror(ret)); 161 162 if (avctx->cutoff) { 163 ret = opus_multistream_encoder_ctl(enc, 164 OPUS_SET_MAX_BANDWIDTH(opts->max_bandwidth)); 165 if (ret != OPUS_OK) 166 av_log(avctx, AV_LOG_WARNING, 167 "Unable to set maximum bandwidth: %s\n", opus_strerror(ret)); 168 } 169 170#ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST 171 ret = opus_multistream_encoder_ctl(enc, 172 OPUS_SET_PHASE_INVERSION_DISABLED(!opts->apply_phase_inv)); 173 if (ret != OPUS_OK) 174 av_log(avctx, AV_LOG_WARNING, 175 "Unable to set phase inversion: %s\n", 176 opus_strerror(ret)); 177#endif 178 return OPUS_OK; 179} 180 181static int libopus_check_max_channels(AVCodecContext *avctx, 182 int max_channels) { 183 if (avctx->ch_layout.nb_channels > max_channels) { 184 av_log(avctx, AV_LOG_ERROR, "Opus mapping family undefined for %d channels.\n", 185 avctx->ch_layout.nb_channels); 186 return AVERROR(EINVAL); 187 } 188 189 return 0; 190} 191 192static int libopus_check_vorbis_layout(AVCodecContext *avctx, int mapping_family) { 193 av_assert2(avctx->ch_layout.nb_channels < FF_ARRAY_ELEMS(ff_vorbis_ch_layouts)); 194 195 if (avctx->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC) { 196 av_log(avctx, AV_LOG_WARNING, 197 "No channel layout specified. Opus encoder will use Vorbis " 198 "channel layout for %d channels.\n", avctx->ch_layout.nb_channels); 199 } else if (av_channel_layout_compare(&avctx->ch_layout, &ff_vorbis_ch_layouts[avctx->ch_layout.nb_channels - 1])) { 200 char name[32]; 201 202 av_channel_layout_describe(&avctx->ch_layout, name, sizeof(name)); 203 av_log(avctx, AV_LOG_ERROR, 204 "Invalid channel layout %s for specified mapping family %d.\n", 205 name, mapping_family); 206 207 return AVERROR(EINVAL); 208 } 209 210 return 0; 211} 212 213static int libopus_validate_layout_and_get_channel_map( 214 AVCodecContext *avctx, 215 int mapping_family, 216 const uint8_t ** channel_map_result) 217{ 218 const uint8_t * channel_map = NULL; 219 int ret; 220 221 switch (mapping_family) { 222 case -1: 223 ret = libopus_check_max_channels(avctx, 8); 224 if (ret == 0) { 225 ret = libopus_check_vorbis_layout(avctx, mapping_family); 226 /* Channels do not need to be reordered. */ 227 } 228 229 break; 230 case 0: 231 ret = libopus_check_max_channels(avctx, 2); 232 if (ret == 0) { 233 ret = libopus_check_vorbis_layout(avctx, mapping_family); 234 } 235 break; 236 case 1: 237 /* Opus expects channels to be in Vorbis order. */ 238 ret = libopus_check_max_channels(avctx, 8); 239 if (ret == 0) { 240 ret = libopus_check_vorbis_layout(avctx, mapping_family); 241 channel_map = ff_vorbis_channel_layout_offsets[avctx->ch_layout.nb_channels - 1]; 242 } 243 break; 244 case 255: 245 ret = libopus_check_max_channels(avctx, 254); 246 break; 247 default: 248 av_log(avctx, AV_LOG_WARNING, 249 "Unknown channel mapping family %d. Output channel layout may be invalid.\n", 250 mapping_family); 251 ret = 0; 252 } 253 254 *channel_map_result = channel_map; 255 return ret; 256} 257 258static av_cold int libopus_encode_init(AVCodecContext *avctx) 259{ 260 LibopusEncContext *opus = avctx->priv_data; 261 OpusMSEncoder *enc; 262 uint8_t libopus_channel_mapping[255]; 263 int ret = OPUS_OK; 264 int channels = avctx->ch_layout.nb_channels; 265 int av_ret; 266 int coupled_stream_count, header_size, frame_size; 267 int mapping_family; 268 269 frame_size = opus->opts.frame_duration * 48000 / 1000; 270 switch (frame_size) { 271 case 120: 272 case 240: 273 if (opus->opts.application != OPUS_APPLICATION_RESTRICTED_LOWDELAY) 274 av_log(avctx, AV_LOG_WARNING, 275 "LPC mode cannot be used with a frame duration of less " 276 "than 10ms. Enabling restricted low-delay mode.\n" 277 "Use a longer frame duration if this is not what you want.\n"); 278 /* Frame sizes less than 10 ms can only use MDCT mode, so switching to 279 * RESTRICTED_LOWDELAY avoids an unnecessary extra 2.5ms lookahead. */ 280 opus->opts.application = OPUS_APPLICATION_RESTRICTED_LOWDELAY; 281 case 480: 282 case 960: 283 case 1920: 284 case 2880: 285#ifdef OPUS_FRAMESIZE_120_MS 286 case 3840: 287 case 4800: 288 case 5760: 289#endif 290 opus->opts.packet_size = 291 avctx->frame_size = frame_size * avctx->sample_rate / 48000; 292 break; 293 default: 294 av_log(avctx, AV_LOG_ERROR, "Invalid frame duration: %g.\n" 295 "Frame duration must be exactly one of: 2.5, 5, 10, 20, 40" 296#ifdef OPUS_FRAMESIZE_120_MS 297 ", 60, 80, 100 or 120.\n", 298#else 299 " or 60.\n", 300#endif 301 opus->opts.frame_duration); 302 return AVERROR(EINVAL); 303 } 304 305 if (avctx->compression_level < 0 || avctx->compression_level > 10) { 306 av_log(avctx, AV_LOG_WARNING, 307 "Compression level must be in the range 0 to 10. " 308 "Defaulting to 10.\n"); 309 opus->opts.complexity = 10; 310 } else { 311 opus->opts.complexity = avctx->compression_level; 312 } 313 314 if (avctx->cutoff) { 315 switch (avctx->cutoff) { 316 case 4000: 317 opus->opts.max_bandwidth = OPUS_BANDWIDTH_NARROWBAND; 318 break; 319 case 6000: 320 opus->opts.max_bandwidth = OPUS_BANDWIDTH_MEDIUMBAND; 321 break; 322 case 8000: 323 opus->opts.max_bandwidth = OPUS_BANDWIDTH_WIDEBAND; 324 break; 325 case 12000: 326 opus->opts.max_bandwidth = OPUS_BANDWIDTH_SUPERWIDEBAND; 327 break; 328 case 20000: 329 opus->opts.max_bandwidth = OPUS_BANDWIDTH_FULLBAND; 330 break; 331 default: 332 av_log(avctx, AV_LOG_WARNING, 333 "Invalid frequency cutoff: %d. Using default maximum bandwidth.\n" 334 "Cutoff frequency must be exactly one of: 4000, 6000, 8000, 12000 or 20000.\n", 335 avctx->cutoff); 336 avctx->cutoff = 0; 337 } 338 } 339 340 /* Channels may need to be reordered to match opus mapping. */ 341 av_ret = libopus_validate_layout_and_get_channel_map(avctx, opus->opts.mapping_family, 342 &opus->encoder_channel_map); 343 if (av_ret) { 344 return av_ret; 345 } 346 347 if (opus->opts.mapping_family == -1) { 348 /* By default, use mapping family 1 for the header but use the older 349 * libopus multistream API to avoid surround masking. */ 350 351 /* Set the mapping family so that the value is correct in the header */ 352 mapping_family = channels > 2 ? 1 : 0; 353 coupled_stream_count = opus_coupled_streams[channels - 1]; 354 opus->stream_count = channels - coupled_stream_count; 355 memcpy(libopus_channel_mapping, 356 opus_vorbis_channel_map[channels - 1], 357 channels * sizeof(*libopus_channel_mapping)); 358 359 enc = opus_multistream_encoder_create( 360 avctx->sample_rate, channels, opus->stream_count, 361 coupled_stream_count, 362 libavcodec_libopus_channel_map[channels - 1], 363 opus->opts.application, &ret); 364 } else { 365 /* Use the newer multistream API. The encoder will set the channel 366 * mapping and coupled stream counts to its internal defaults and will 367 * use surround masking analysis to save bits. */ 368 mapping_family = opus->opts.mapping_family; 369 enc = opus_multistream_surround_encoder_create( 370 avctx->sample_rate, channels, mapping_family, 371 &opus->stream_count, &coupled_stream_count, libopus_channel_mapping, 372 opus->opts.application, &ret); 373 } 374 375 if (ret != OPUS_OK) { 376 av_log(avctx, AV_LOG_ERROR, 377 "Failed to create encoder: %s\n", opus_strerror(ret)); 378 return ff_opus_error_to_averror(ret); 379 } 380 381 if (!avctx->bit_rate) { 382 /* Sane default copied from opusenc */ 383 avctx->bit_rate = 64000 * opus->stream_count + 384 32000 * coupled_stream_count; 385 av_log(avctx, AV_LOG_WARNING, 386 "No bit rate set. Defaulting to %"PRId64" bps.\n", avctx->bit_rate); 387 } 388 389 if (avctx->bit_rate < 500 || avctx->bit_rate > 256000 * channels) { 390 av_log(avctx, AV_LOG_ERROR, "The bit rate %"PRId64" bps is unsupported. " 391 "Please choose a value between 500 and %d.\n", avctx->bit_rate, 392 256000 * channels); 393 ret = AVERROR(EINVAL); 394 goto fail; 395 } 396 397 ret = libopus_configure_encoder(avctx, enc, &opus->opts); 398 if (ret != OPUS_OK) { 399 ret = ff_opus_error_to_averror(ret); 400 goto fail; 401 } 402 403 /* Header includes channel mapping table if and only if mapping family is NOT 0 */ 404 header_size = 19 + (mapping_family == 0 ? 0 : 2 + channels); 405 avctx->extradata = av_malloc(header_size + AV_INPUT_BUFFER_PADDING_SIZE); 406 if (!avctx->extradata) { 407 av_log(avctx, AV_LOG_ERROR, "Failed to allocate extradata.\n"); 408 ret = AVERROR(ENOMEM); 409 goto fail; 410 } 411 avctx->extradata_size = header_size; 412 413 opus->samples = av_calloc(frame_size, channels * 414 av_get_bytes_per_sample(avctx->sample_fmt)); 415 if (!opus->samples) { 416 av_log(avctx, AV_LOG_ERROR, "Failed to allocate samples buffer.\n"); 417 ret = AVERROR(ENOMEM); 418 goto fail; 419 } 420 421 ret = opus_multistream_encoder_ctl(enc, OPUS_GET_LOOKAHEAD(&avctx->initial_padding)); 422 if (ret != OPUS_OK) 423 av_log(avctx, AV_LOG_WARNING, 424 "Unable to get number of lookahead samples: %s\n", 425 opus_strerror(ret)); 426 427 libopus_write_header(avctx, opus->stream_count, coupled_stream_count, 428 mapping_family, libopus_channel_mapping); 429 430 ff_af_queue_init(avctx, &opus->afq); 431 432 opus->enc = enc; 433 434 return 0; 435 436fail: 437 opus_multistream_encoder_destroy(enc); 438 return ret; 439} 440 441static void libopus_copy_samples_with_channel_map( 442 uint8_t *dst, const uint8_t *src, const uint8_t *channel_map, 443 int nb_channels, int nb_samples, int bytes_per_sample) { 444 int sample, channel; 445 for (sample = 0; sample < nb_samples; ++sample) { 446 for (channel = 0; channel < nb_channels; ++channel) { 447 const size_t src_pos = bytes_per_sample * (nb_channels * sample + channel); 448 const size_t dst_pos = bytes_per_sample * (nb_channels * sample + channel_map[channel]); 449 450 memcpy(&dst[dst_pos], &src[src_pos], bytes_per_sample); 451 } 452 } 453} 454 455static int libopus_encode(AVCodecContext *avctx, AVPacket *avpkt, 456 const AVFrame *frame, int *got_packet_ptr) 457{ 458 LibopusEncContext *opus = avctx->priv_data; 459 const int bytes_per_sample = av_get_bytes_per_sample(avctx->sample_fmt); 460 const int channels = avctx->ch_layout.nb_channels; 461 const int sample_size = channels * bytes_per_sample; 462 uint8_t *audio; 463 int ret; 464 int discard_padding; 465 466 if (frame) { 467 ret = ff_af_queue_add(&opus->afq, frame); 468 if (ret < 0) 469 return ret; 470 if (opus->encoder_channel_map != NULL) { 471 audio = opus->samples; 472 libopus_copy_samples_with_channel_map( 473 audio, frame->data[0], opus->encoder_channel_map, 474 channels, frame->nb_samples, bytes_per_sample); 475 } else if (frame->nb_samples < opus->opts.packet_size) { 476 audio = opus->samples; 477 memcpy(audio, frame->data[0], frame->nb_samples * sample_size); 478 } else 479 audio = frame->data[0]; 480 } else { 481 if (!opus->afq.remaining_samples || (!opus->afq.frame_alloc && !opus->afq.frame_count)) 482 return 0; 483 audio = opus->samples; 484 memset(audio, 0, opus->opts.packet_size * sample_size); 485 } 486 487 /* Maximum packet size taken from opusenc in opus-tools. 120ms packets 488 * consist of 6 frames in one packet. The maximum frame size is 1275 489 * bytes along with the largest possible packet header of 7 bytes. */ 490 if ((ret = ff_alloc_packet(avctx, avpkt, (1275 * 6 + 7) * opus->stream_count)) < 0) 491 return ret; 492 493 if (avctx->sample_fmt == AV_SAMPLE_FMT_FLT) 494 ret = opus_multistream_encode_float(opus->enc, (float *)audio, 495 opus->opts.packet_size, 496 avpkt->data, avpkt->size); 497 else 498 ret = opus_multistream_encode(opus->enc, (opus_int16 *)audio, 499 opus->opts.packet_size, 500 avpkt->data, avpkt->size); 501 502 if (ret < 0) { 503 av_log(avctx, AV_LOG_ERROR, 504 "Error encoding frame: %s\n", opus_strerror(ret)); 505 return ff_opus_error_to_averror(ret); 506 } 507 508 av_shrink_packet(avpkt, ret); 509 510 ff_af_queue_remove(&opus->afq, opus->opts.packet_size, 511 &avpkt->pts, &avpkt->duration); 512 513 discard_padding = opus->opts.packet_size - avpkt->duration; 514 // Check if subtraction resulted in an overflow 515 if ((discard_padding < opus->opts.packet_size) != (avpkt->duration > 0)) { 516 av_packet_unref(avpkt); 517 return AVERROR(EINVAL); 518 } 519 if (discard_padding > 0) { 520 uint8_t* side_data = av_packet_new_side_data(avpkt, 521 AV_PKT_DATA_SKIP_SAMPLES, 522 10); 523 if(!side_data) { 524 av_packet_unref(avpkt); 525 return AVERROR(ENOMEM); 526 } 527 AV_WL32(side_data + 4, discard_padding); 528 } 529 530 *got_packet_ptr = 1; 531 532 return 0; 533} 534 535static av_cold int libopus_encode_close(AVCodecContext *avctx) 536{ 537 LibopusEncContext *opus = avctx->priv_data; 538 539 opus_multistream_encoder_destroy(opus->enc); 540 541 ff_af_queue_close(&opus->afq); 542 543 av_freep(&opus->samples); 544 545 return 0; 546} 547 548#define OFFSET(x) offsetof(LibopusEncContext, opts.x) 549#define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM 550static const AVOption libopus_options[] = { 551 { "application", "Intended application type", OFFSET(application), AV_OPT_TYPE_INT, { .i64 = OPUS_APPLICATION_AUDIO }, OPUS_APPLICATION_VOIP, OPUS_APPLICATION_RESTRICTED_LOWDELAY, FLAGS, "application" }, 552 { "voip", "Favor improved speech intelligibility", 0, AV_OPT_TYPE_CONST, { .i64 = OPUS_APPLICATION_VOIP }, 0, 0, FLAGS, "application" }, 553 { "audio", "Favor faithfulness to the input", 0, AV_OPT_TYPE_CONST, { .i64 = OPUS_APPLICATION_AUDIO }, 0, 0, FLAGS, "application" }, 554 { "lowdelay", "Restrict to only the lowest delay modes", 0, AV_OPT_TYPE_CONST, { .i64 = OPUS_APPLICATION_RESTRICTED_LOWDELAY }, 0, 0, FLAGS, "application" }, 555 { "frame_duration", "Duration of a frame in milliseconds", OFFSET(frame_duration), AV_OPT_TYPE_FLOAT, { .dbl = 20.0 }, 2.5, 120.0, FLAGS }, 556 { "packet_loss", "Expected packet loss percentage", OFFSET(packet_loss), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 100, FLAGS }, 557 { "fec", "Enable inband FEC. Expected packet loss must be non-zero", OFFSET(fec), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS }, 558 { "vbr", "Variable bit rate mode", OFFSET(vbr), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 2, FLAGS, "vbr" }, 559 { "off", "Use constant bit rate", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, FLAGS, "vbr" }, 560 { "on", "Use variable bit rate", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, FLAGS, "vbr" }, 561 { "constrained", "Use constrained VBR", 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, 0, 0, FLAGS, "vbr" }, 562 { "mapping_family", "Channel Mapping Family", OFFSET(mapping_family), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, FLAGS, "mapping_family" }, 563#ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST 564 { "apply_phase_inv", "Apply intensity stereo phase inversion", OFFSET(apply_phase_inv), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS }, 565#endif 566 { NULL }, 567}; 568 569static const AVClass libopus_class = { 570 .class_name = "libopus", 571 .item_name = av_default_item_name, 572 .option = libopus_options, 573 .version = LIBAVUTIL_VERSION_INT, 574}; 575 576static const FFCodecDefault libopus_defaults[] = { 577 { "b", "0" }, 578 { "compression_level", "10" }, 579 { NULL }, 580}; 581 582static const int libopus_sample_rates[] = { 583 48000, 24000, 16000, 12000, 8000, 0, 584}; 585 586const FFCodec ff_libopus_encoder = { 587 .p.name = "libopus", 588 .p.long_name = NULL_IF_CONFIG_SMALL("libopus Opus"), 589 .p.type = AVMEDIA_TYPE_AUDIO, 590 .p.id = AV_CODEC_ID_OPUS, 591 .priv_data_size = sizeof(LibopusEncContext), 592 .init = libopus_encode_init, 593 FF_CODEC_ENCODE_CB(libopus_encode), 594 .close = libopus_encode_close, 595 .p.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SMALL_LAST_FRAME, 596 .p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, 597 AV_SAMPLE_FMT_FLT, 598 AV_SAMPLE_FMT_NONE }, 599 .p.supported_samplerates = libopus_sample_rates, 600 .p.priv_class = &libopus_class, 601 .defaults = libopus_defaults, 602 .p.wrapper_name = "libopus", 603}; 604