| /* | |
| * Opus encoder using libopus | |
| * Copyright (c) 2012 Nathan Caldwell | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| #include <opus.h> | |
| #include <opus_multistream.h> | |
| #include "libavutil/channel_layout.h" | |
| #include "libavutil/opt.h" | |
| #include "avcodec.h" | |
| #include "bytestream.h" | |
| #include "codec_internal.h" | |
| #include "encode.h" | |
| #include "libopus.h" | |
| #include "audio_frame_queue.h" | |
| #include "vorbis_data.h" | |
| typedef struct LibopusEncOpts { | |
| int vbr; | |
| int application; | |
| int packet_loss; | |
| int fec; | |
| int complexity; | |
| float frame_duration; | |
| int packet_size; | |
| int max_bandwidth; | |
| int mapping_family; | |
| #ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST | |
| int apply_phase_inv; | |
| #endif | |
| } LibopusEncOpts; | |
| typedef struct LibopusEncContext { | |
| AVClass *class; | |
| OpusMSEncoder *enc; | |
| int stream_count; | |
| uint8_t *samples; | |
| LibopusEncOpts opts; | |
| AudioFrameQueue afq; | |
| const uint8_t *encoder_channel_map; | |
| } LibopusEncContext; | |
| static const uint8_t opus_coupled_streams[8] = { | |
| 0, 1, 1, 2, 2, 2, 2, 3 | |
| }; | |
| /* Opus internal to Vorbis channel order mapping written in the header */ | |
| static const uint8_t opus_vorbis_channel_map[8][8] = { | |
| { 0 }, | |
| { 0, 1 }, | |
| { 0, 2, 1 }, | |
| { 0, 1, 2, 3 }, | |
| { 0, 4, 1, 2, 3 }, | |
| { 0, 4, 1, 2, 3, 5 }, | |
| { 0, 4, 1, 2, 3, 5, 6 }, | |
| { 0, 6, 1, 2, 3, 4, 5, 7 }, | |
| }; | |
| /* libavcodec to libopus channel order mapping, passed to libopus */ | |
| static const uint8_t libavcodec_libopus_channel_map[8][8] = { | |
| { 0 }, | |
| { 0, 1 }, | |
| { 0, 1, 2 }, | |
| { 0, 1, 2, 3 }, | |
| { 0, 1, 3, 4, 2 }, | |
| { 0, 1, 4, 5, 2, 3 }, | |
| { 0, 1, 5, 6, 2, 4, 3 }, | |
| { 0, 1, 6, 7, 4, 5, 2, 3 }, | |
| }; | |
| static void libopus_write_header(AVCodecContext *avctx, int stream_count, | |
| int coupled_stream_count, | |
| int mapping_family, | |
| const uint8_t *channel_mapping) | |
| { | |
| uint8_t *p = avctx->extradata; | |
| int channels = avctx->ch_layout.nb_channels; | |
| bytestream_put_buffer(&p, "OpusHead", 8); | |
| bytestream_put_byte(&p, 1); /* Version */ | |
| bytestream_put_byte(&p, channels); | |
| bytestream_put_le16(&p, avctx->initial_padding * 48000 / avctx->sample_rate); /* Lookahead samples at 48kHz */ | |
| bytestream_put_le32(&p, avctx->sample_rate); /* Original sample rate */ | |
| bytestream_put_le16(&p, 0); /* Gain of 0dB is recommended. */ | |
| /* Channel mapping */ | |
| bytestream_put_byte(&p, mapping_family); | |
| if (mapping_family != 0) { | |
| bytestream_put_byte(&p, stream_count); | |
| bytestream_put_byte(&p, coupled_stream_count); | |
| bytestream_put_buffer(&p, channel_mapping, channels); | |
| } | |
| } | |
| static int libopus_configure_encoder(AVCodecContext *avctx, OpusMSEncoder *enc, | |
| LibopusEncOpts *opts) | |
| { | |
| int ret; | |
| if (avctx->global_quality) { | |
| av_log(avctx, AV_LOG_ERROR, | |
| "Quality-based encoding not supported, " | |
| "please specify a bitrate and VBR setting.\n"); | |
| return AVERROR(EINVAL); | |
| } | |
| ret = opus_multistream_encoder_ctl(enc, OPUS_SET_BITRATE(avctx->bit_rate)); | |
| if (ret != OPUS_OK) { | |
| av_log(avctx, AV_LOG_ERROR, | |
| "Failed to set bitrate: %s\n", opus_strerror(ret)); | |
| return ret; | |
| } | |
| ret = opus_multistream_encoder_ctl(enc, | |
| OPUS_SET_COMPLEXITY(opts->complexity)); | |
| if (ret != OPUS_OK) | |
| av_log(avctx, AV_LOG_WARNING, | |
| "Unable to set complexity: %s\n", opus_strerror(ret)); | |
| ret = opus_multistream_encoder_ctl(enc, OPUS_SET_VBR(!!opts->vbr)); | |
| if (ret != OPUS_OK) | |
| av_log(avctx, AV_LOG_WARNING, | |
| "Unable to set VBR: %s\n", opus_strerror(ret)); | |
| ret = opus_multistream_encoder_ctl(enc, | |
| OPUS_SET_VBR_CONSTRAINT(opts->vbr == 2)); | |
| if (ret != OPUS_OK) | |
| av_log(avctx, AV_LOG_WARNING, | |
| "Unable to set constrained VBR: %s\n", opus_strerror(ret)); | |
| ret = opus_multistream_encoder_ctl(enc, | |
| OPUS_SET_PACKET_LOSS_PERC(opts->packet_loss)); | |
| if (ret != OPUS_OK) | |
| av_log(avctx, AV_LOG_WARNING, | |
| "Unable to set expected packet loss percentage: %s\n", | |
| opus_strerror(ret)); | |
| ret = opus_multistream_encoder_ctl(enc, | |
| OPUS_SET_INBAND_FEC(opts->fec)); | |
| if (ret != OPUS_OK) | |
| av_log(avctx, AV_LOG_WARNING, | |
| "Unable to set inband FEC: %s\n", | |
| opus_strerror(ret)); | |
| if (avctx->cutoff) { | |
| ret = opus_multistream_encoder_ctl(enc, | |
| OPUS_SET_MAX_BANDWIDTH(opts->max_bandwidth)); | |
| if (ret != OPUS_OK) | |
| av_log(avctx, AV_LOG_WARNING, | |
| "Unable to set maximum bandwidth: %s\n", opus_strerror(ret)); | |
| } | |
| #ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST | |
| ret = opus_multistream_encoder_ctl(enc, | |
| OPUS_SET_PHASE_INVERSION_DISABLED(!opts->apply_phase_inv)); | |
| if (ret != OPUS_OK) | |
| av_log(avctx, AV_LOG_WARNING, | |
| "Unable to set phase inversion: %s\n", | |
| opus_strerror(ret)); | |
| #endif | |
| return OPUS_OK; | |
| } | |
| static int libopus_check_max_channels(AVCodecContext *avctx, | |
| int max_channels) { | |
| if (avctx->ch_layout.nb_channels > max_channels) { | |
| av_log(avctx, AV_LOG_ERROR, "Opus mapping family undefined for %d channels.\n", | |
| avctx->ch_layout.nb_channels); | |
| return AVERROR(EINVAL); | |
| } | |
| return 0; | |
| } | |
| static int libopus_check_vorbis_layout(AVCodecContext *avctx, int mapping_family) { | |
| av_assert2(avctx->ch_layout.nb_channels < FF_ARRAY_ELEMS(ff_vorbis_ch_layouts)); | |
| if (avctx->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC) { | |
| av_log(avctx, AV_LOG_WARNING, | |
| "No channel layout specified. Opus encoder will use Vorbis " | |
| "channel layout for %d channels.\n", avctx->ch_layout.nb_channels); | |
| } else if (av_channel_layout_compare(&avctx->ch_layout, &ff_vorbis_ch_layouts[avctx->ch_layout.nb_channels - 1])) { | |
| char name[32]; | |
| av_channel_layout_describe(&avctx->ch_layout, name, sizeof(name)); | |
| av_log(avctx, AV_LOG_ERROR, | |
| "Invalid channel layout %s for specified mapping family %d.\n", | |
| name, mapping_family); | |
| return AVERROR(EINVAL); | |
| } | |
| return 0; | |
| } | |
| static int libopus_validate_layout_and_get_channel_map( | |
| AVCodecContext *avctx, | |
| int mapping_family, | |
| const uint8_t ** channel_map_result) | |
| { | |
| const uint8_t * channel_map = NULL; | |
| int ret; | |
| switch (mapping_family) { | |
| case -1: | |
| ret = libopus_check_max_channels(avctx, 8); | |
| if (ret == 0) { | |
| ret = libopus_check_vorbis_layout(avctx, mapping_family); | |
| /* Channels do not need to be reordered. */ | |
| } | |
| break; | |
| case 0: | |
| ret = libopus_check_max_channels(avctx, 2); | |
| if (ret == 0) { | |
| ret = libopus_check_vorbis_layout(avctx, mapping_family); | |
| } | |
| break; | |
| case 1: | |
| /* Opus expects channels to be in Vorbis order. */ | |
| ret = libopus_check_max_channels(avctx, 8); | |
| if (ret == 0) { | |
| ret = libopus_check_vorbis_layout(avctx, mapping_family); | |
| channel_map = ff_vorbis_channel_layout_offsets[avctx->ch_layout.nb_channels - 1]; | |
| } | |
| break; | |
| case 255: | |
| ret = libopus_check_max_channels(avctx, 254); | |
| break; | |
| default: | |
| av_log(avctx, AV_LOG_WARNING, | |
| "Unknown channel mapping family %d. Output channel layout may be invalid.\n", | |
| mapping_family); | |
| ret = 0; | |
| } | |
| *channel_map_result = channel_map; | |
| return ret; | |
| } | |
| static av_cold int libopus_encode_init(AVCodecContext *avctx) | |
| { | |
| LibopusEncContext *opus = avctx->priv_data; | |
| OpusMSEncoder *enc; | |
| uint8_t libopus_channel_mapping[255]; | |
| int ret = OPUS_OK; | |
| int channels = avctx->ch_layout.nb_channels; | |
| int av_ret; | |
| int coupled_stream_count, header_size, frame_size; | |
| int mapping_family; | |
| frame_size = opus->opts.frame_duration * 48000 / 1000; | |
| switch (frame_size) { | |
| case 120: | |
| case 240: | |
| if (opus->opts.application != OPUS_APPLICATION_RESTRICTED_LOWDELAY) | |
| av_log(avctx, AV_LOG_WARNING, | |
| "LPC mode cannot be used with a frame duration of less " | |
| "than 10ms. Enabling restricted low-delay mode.\n" | |
| "Use a longer frame duration if this is not what you want.\n"); | |
| /* Frame sizes less than 10 ms can only use MDCT mode, so switching to | |
| * RESTRICTED_LOWDELAY avoids an unnecessary extra 2.5ms lookahead. */ | |
| opus->opts.application = OPUS_APPLICATION_RESTRICTED_LOWDELAY; | |
| case 480: | |
| case 960: | |
| case 1920: | |
| case 2880: | |
| #ifdef OPUS_FRAMESIZE_120_MS | |
| case 3840: | |
| case 4800: | |
| case 5760: | |
| #endif | |
| opus->opts.packet_size = | |
| avctx->frame_size = frame_size * avctx->sample_rate / 48000; | |
| break; | |
| default: | |
| av_log(avctx, AV_LOG_ERROR, "Invalid frame duration: %g.\n" | |
| "Frame duration must be exactly one of: 2.5, 5, 10, 20, 40" | |
| #ifdef OPUS_FRAMESIZE_120_MS | |
| ", 60, 80, 100 or 120.\n", | |
| #else | |
| " or 60.\n", | |
| #endif | |
| opus->opts.frame_duration); | |
| return AVERROR(EINVAL); | |
| } | |
| if (avctx->compression_level < 0 || avctx->compression_level > 10) { | |
| av_log(avctx, AV_LOG_WARNING, | |
| "Compression level must be in the range 0 to 10. " | |
| "Defaulting to 10.\n"); | |
| opus->opts.complexity = 10; | |
| } else { | |
| opus->opts.complexity = avctx->compression_level; | |
| } | |
| if (avctx->cutoff) { | |
| switch (avctx->cutoff) { | |
| case 4000: | |
| opus->opts.max_bandwidth = OPUS_BANDWIDTH_NARROWBAND; | |
| break; | |
| case 6000: | |
| opus->opts.max_bandwidth = OPUS_BANDWIDTH_MEDIUMBAND; | |
| break; | |
| case 8000: | |
| opus->opts.max_bandwidth = OPUS_BANDWIDTH_WIDEBAND; | |
| break; | |
| case 12000: | |
| opus->opts.max_bandwidth = OPUS_BANDWIDTH_SUPERWIDEBAND; | |
| break; | |
| case 20000: | |
| opus->opts.max_bandwidth = OPUS_BANDWIDTH_FULLBAND; | |
| break; | |
| default: | |
| av_log(avctx, AV_LOG_WARNING, | |
| "Invalid frequency cutoff: %d. Using default maximum bandwidth.\n" | |
| "Cutoff frequency must be exactly one of: 4000, 6000, 8000, 12000 or 20000.\n", | |
| avctx->cutoff); | |
| avctx->cutoff = 0; | |
| } | |
| } | |
| /* Channels may need to be reordered to match opus mapping. */ | |
| av_ret = libopus_validate_layout_and_get_channel_map(avctx, opus->opts.mapping_family, | |
| &opus->encoder_channel_map); | |
| if (av_ret) { | |
| return av_ret; | |
| } | |
| if (opus->opts.mapping_family == -1) { | |
| /* By default, use mapping family 1 for the header but use the older | |
| * libopus multistream API to avoid surround masking. */ | |
| /* Set the mapping family so that the value is correct in the header */ | |
| mapping_family = channels > 2 ? 1 : 0; | |
| coupled_stream_count = opus_coupled_streams[channels - 1]; | |
| opus->stream_count = channels - coupled_stream_count; | |
| memcpy(libopus_channel_mapping, | |
| opus_vorbis_channel_map[channels - 1], | |
| channels * sizeof(*libopus_channel_mapping)); | |
| enc = opus_multistream_encoder_create( | |
| avctx->sample_rate, channels, opus->stream_count, | |
| coupled_stream_count, | |
| libavcodec_libopus_channel_map[channels - 1], | |
| opus->opts.application, &ret); | |
| } else { | |
| /* Use the newer multistream API. The encoder will set the channel | |
| * mapping and coupled stream counts to its internal defaults and will | |
| * use surround masking analysis to save bits. */ | |
| mapping_family = opus->opts.mapping_family; | |
| enc = opus_multistream_surround_encoder_create( | |
| avctx->sample_rate, channels, mapping_family, | |
| &opus->stream_count, &coupled_stream_count, libopus_channel_mapping, | |
| opus->opts.application, &ret); | |
| } | |
| if (ret != OPUS_OK) { | |
| av_log(avctx, AV_LOG_ERROR, | |
| "Failed to create encoder: %s\n", opus_strerror(ret)); | |
| return ff_opus_error_to_averror(ret); | |
| } | |
| if (!avctx->bit_rate) { | |
| /* Sane default copied from opusenc */ | |
| avctx->bit_rate = 64000 * opus->stream_count + | |
| 32000 * coupled_stream_count; | |
| av_log(avctx, AV_LOG_WARNING, | |
| "No bit rate set. Defaulting to %"PRId64" bps.\n", avctx->bit_rate); | |
| } | |
| if (avctx->bit_rate < 500 || avctx->bit_rate > 256000 * channels) { | |
| av_log(avctx, AV_LOG_ERROR, "The bit rate %"PRId64" bps is unsupported. " | |
| "Please choose a value between 500 and %d.\n", avctx->bit_rate, | |
| 256000 * channels); | |
| ret = AVERROR(EINVAL); | |
| goto fail; | |
| } | |
| ret = libopus_configure_encoder(avctx, enc, &opus->opts); | |
| if (ret != OPUS_OK) { | |
| ret = ff_opus_error_to_averror(ret); | |
| goto fail; | |
| } | |
| /* Header includes channel mapping table if and only if mapping family is NOT 0 */ | |
| header_size = 19 + (mapping_family == 0 ? 0 : 2 + channels); | |
| avctx->extradata = av_malloc(header_size + AV_INPUT_BUFFER_PADDING_SIZE); | |
| if (!avctx->extradata) { | |
| av_log(avctx, AV_LOG_ERROR, "Failed to allocate extradata.\n"); | |
| ret = AVERROR(ENOMEM); | |
| goto fail; | |
| } | |
| avctx->extradata_size = header_size; | |
| opus->samples = av_calloc(frame_size, channels * | |
| av_get_bytes_per_sample(avctx->sample_fmt)); | |
| if (!opus->samples) { | |
| av_log(avctx, AV_LOG_ERROR, "Failed to allocate samples buffer.\n"); | |
| ret = AVERROR(ENOMEM); | |
| goto fail; | |
| } | |
| ret = opus_multistream_encoder_ctl(enc, OPUS_GET_LOOKAHEAD(&avctx->initial_padding)); | |
| if (ret != OPUS_OK) | |
| av_log(avctx, AV_LOG_WARNING, | |
| "Unable to get number of lookahead samples: %s\n", | |
| opus_strerror(ret)); | |
| libopus_write_header(avctx, opus->stream_count, coupled_stream_count, | |
| mapping_family, libopus_channel_mapping); | |
| ff_af_queue_init(avctx, &opus->afq); | |
| opus->enc = enc; | |
| return 0; | |
| fail: | |
| opus_multistream_encoder_destroy(enc); | |
| return ret; | |
| } | |
| static void libopus_copy_samples_with_channel_map( | |
| uint8_t *dst, const uint8_t *src, const uint8_t *channel_map, | |
| int nb_channels, int nb_samples, int bytes_per_sample) { | |
| int sample, channel; | |
| for (sample = 0; sample < nb_samples; ++sample) { | |
| for (channel = 0; channel < nb_channels; ++channel) { | |
| const size_t src_pos = bytes_per_sample * (nb_channels * sample + channel); | |
| const size_t dst_pos = bytes_per_sample * (nb_channels * sample + channel_map[channel]); | |
| memcpy(&dst[dst_pos], &src[src_pos], bytes_per_sample); | |
| } | |
| } | |
| } | |
| static int libopus_encode(AVCodecContext *avctx, AVPacket *avpkt, | |
| const AVFrame *frame, int *got_packet_ptr) | |
| { | |
| LibopusEncContext *opus = avctx->priv_data; | |
| const int bytes_per_sample = av_get_bytes_per_sample(avctx->sample_fmt); | |
| const int channels = avctx->ch_layout.nb_channels; | |
| const int sample_size = channels * bytes_per_sample; | |
| const uint8_t *audio; | |
| int ret; | |
| int discard_padding; | |
| if (frame) { | |
| ret = ff_af_queue_add(&opus->afq, frame); | |
| if (ret < 0) | |
| return ret; | |
| if (opus->encoder_channel_map != NULL) { | |
| audio = opus->samples; | |
| libopus_copy_samples_with_channel_map( | |
| opus->samples, frame->data[0], opus->encoder_channel_map, | |
| channels, frame->nb_samples, bytes_per_sample); | |
| } else if (frame->nb_samples < opus->opts.packet_size) { | |
| audio = opus->samples; | |
| memcpy(opus->samples, frame->data[0], frame->nb_samples * sample_size); | |
| } else | |
| audio = frame->data[0]; | |
| } else { | |
| if (!opus->afq.remaining_samples || (!opus->afq.frame_alloc && !opus->afq.frame_count)) | |
| return 0; | |
| audio = opus->samples; | |
| memset(opus->samples, 0, opus->opts.packet_size * sample_size); | |
| } | |
| /* Maximum packet size taken from opusenc in opus-tools. 120ms packets | |
| * consist of 6 frames in one packet. The maximum frame size is 1275 | |
| * bytes along with the largest possible packet header of 7 bytes. */ | |
| if ((ret = ff_alloc_packet(avctx, avpkt, (1275 * 6 + 7) * opus->stream_count)) < 0) | |
| return ret; | |
| if (avctx->sample_fmt == AV_SAMPLE_FMT_FLT) | |
| ret = opus_multistream_encode_float(opus->enc, (const float *)audio, | |
| opus->opts.packet_size, | |
| avpkt->data, avpkt->size); | |
| else | |
| ret = opus_multistream_encode(opus->enc, (const opus_int16 *)audio, | |
| opus->opts.packet_size, | |
| avpkt->data, avpkt->size); | |
| if (ret < 0) { | |
| av_log(avctx, AV_LOG_ERROR, | |
| "Error encoding frame: %s\n", opus_strerror(ret)); | |
| return ff_opus_error_to_averror(ret); | |
| } | |
| av_shrink_packet(avpkt, ret); | |
| ff_af_queue_remove(&opus->afq, opus->opts.packet_size, | |
| &avpkt->pts, &avpkt->duration); | |
| discard_padding = opus->opts.packet_size - avpkt->duration; | |
| // Check if subtraction resulted in an overflow | |
| if ((discard_padding < opus->opts.packet_size) != (avpkt->duration > 0)) | |
| return AVERROR(EINVAL); | |
| if (discard_padding > 0) { | |
| uint8_t* side_data = av_packet_new_side_data(avpkt, | |
| AV_PKT_DATA_SKIP_SAMPLES, | |
| 10); | |
| if (!side_data) | |
| return AVERROR(ENOMEM); | |
| AV_WL32(side_data + 4, discard_padding); | |
| } | |
| *got_packet_ptr = 1; | |
| return 0; | |
| } | |
| static av_cold int libopus_encode_close(AVCodecContext *avctx) | |
| { | |
| LibopusEncContext *opus = avctx->priv_data; | |
| opus_multistream_encoder_destroy(opus->enc); | |
| ff_af_queue_close(&opus->afq); | |
| av_freep(&opus->samples); | |
| return 0; | |
| } | |
| #define OFFSET(x) offsetof(LibopusEncContext, opts.x) | |
| #define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM | |
| static const AVOption libopus_options[] = { | |
| { "application", "Intended application type", OFFSET(application), AV_OPT_TYPE_INT, { .i64 = OPUS_APPLICATION_AUDIO }, OPUS_APPLICATION_VOIP, OPUS_APPLICATION_RESTRICTED_LOWDELAY, FLAGS, .unit = "application" }, | |
| { "voip", "Favor improved speech intelligibility", 0, AV_OPT_TYPE_CONST, { .i64 = OPUS_APPLICATION_VOIP }, 0, 0, FLAGS, .unit = "application" }, | |
| { "audio", "Favor faithfulness to the input", 0, AV_OPT_TYPE_CONST, { .i64 = OPUS_APPLICATION_AUDIO }, 0, 0, FLAGS, .unit = "application" }, | |
| { "lowdelay", "Restrict to only the lowest delay modes, disable voice-optimized modes", 0, AV_OPT_TYPE_CONST, { .i64 = OPUS_APPLICATION_RESTRICTED_LOWDELAY }, 0, 0, FLAGS, .unit = "application" }, | |
| { "frame_duration", "Duration of a frame in milliseconds", OFFSET(frame_duration), AV_OPT_TYPE_FLOAT, { .dbl = 20.0 }, 2.5, 120.0, FLAGS }, | |
| { "packet_loss", "Expected packet loss percentage", OFFSET(packet_loss), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 100, FLAGS }, | |
| { "fec", "Enable inband FEC. Expected packet loss must be non-zero", OFFSET(fec), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS }, | |
| { "vbr", "Variable bit rate mode", OFFSET(vbr), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 2, FLAGS, .unit = "vbr" }, | |
| { "off", "Use constant bit rate", 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, FLAGS, .unit = "vbr" }, | |
| { "on", "Use variable bit rate", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, FLAGS, .unit = "vbr" }, | |
| { "constrained", "Use constrained VBR", 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, 0, 0, FLAGS, .unit = "vbr" }, | |
| { "mapping_family", "Channel Mapping Family", OFFSET(mapping_family), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, FLAGS, .unit = "mapping_family" }, | |
| #ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST | |
| { "apply_phase_inv", "Apply intensity stereo phase inversion", OFFSET(apply_phase_inv), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS }, | |
| #endif | |
| { NULL }, | |
| }; | |
| static const AVClass libopus_class = { | |
| .class_name = "libopus", | |
| .item_name = av_default_item_name, | |
| .option = libopus_options, | |
| .version = LIBAVUTIL_VERSION_INT, | |
| }; | |
| static const FFCodecDefault libopus_defaults[] = { | |
| { "b", "0" }, | |
| { "compression_level", "10" }, | |
| { NULL }, | |
| }; | |
| static const int libopus_sample_rates[] = { | |
| 48000, 24000, 16000, 12000, 8000, 0, | |
| }; | |
| const FFCodec ff_libopus_encoder = { | |
| .p.name = "libopus", | |
| CODEC_LONG_NAME("libopus Opus"), | |
| .p.type = AVMEDIA_TYPE_AUDIO, | |
| .p.id = AV_CODEC_ID_OPUS, | |
| .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY | | |
| AV_CODEC_CAP_SMALL_LAST_FRAME, | |
| .caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE, | |
| .priv_data_size = sizeof(LibopusEncContext), | |
| .init = libopus_encode_init, | |
| FF_CODEC_ENCODE_CB(libopus_encode), | |
| .close = libopus_encode_close, | |
| .p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, | |
| AV_SAMPLE_FMT_FLT, | |
| AV_SAMPLE_FMT_NONE }, | |
| .p.supported_samplerates = libopus_sample_rates, | |
| .p.priv_class = &libopus_class, | |
| .defaults = libopus_defaults, | |
| .p.wrapper_name = "libopus", | |
| }; |