diff --git a/Changelog b/Changelog index b7a1af4083..5c8f505211 100644 --- a/Changelog +++ b/Changelog @@ -5,6 +5,7 @@ version : - Raw Captions with Time (RCWT) closed caption demuxer - LC3/LC3plus decoding/encoding using external library liblc3 - ffmpeg CLI filtergraph chaining +- LC3/LC3plus demuxer and muxer version 7.0: diff --git a/doc/muxers.texi b/doc/muxers.texi index 489f22288b..a77472ef1b 100644 --- a/doc/muxers.texi +++ b/doc/muxers.texi @@ -2725,6 +2725,12 @@ games such as "Real War", and "Real War: Rogue States". This muxer accepts a single @samp{adpcm_ima_ssi} audio stream. +@section lc3 +Bluetooth SIG Low Complexity Communication Codec audio (LC3), or +ETSI TS 103 634 Low Complexity Communication Codec plus (LC3plus). + +This muxer accepts a single @samp{lc3} audio stream. + @section lrc LRC lyrics file format muxer. diff --git a/libavformat/Makefile b/libavformat/Makefile index 9981799cc9..8efe26b6df 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -332,6 +332,8 @@ OBJS-$(CONFIG_KVAG_DEMUXER) += kvag.o OBJS-$(CONFIG_KVAG_MUXER) += kvag.o rawenc.o OBJS-$(CONFIG_LAF_DEMUXER) += lafdec.o OBJS-$(CONFIG_LATM_MUXER) += latmenc.o rawenc.o +OBJS-$(CONFIG_LC3_DEMUXER) += lc3.o +OBJS-$(CONFIG_LC3_MUXER) += lc3.o OBJS-$(CONFIG_LMLM4_DEMUXER) += lmlm4.o OBJS-$(CONFIG_LOAS_DEMUXER) += loasdec.o rawdec.o OBJS-$(CONFIG_LUODAT_DEMUXER) += luodatdec.o diff --git a/libavformat/allformats.c b/libavformat/allformats.c index ae925dcf60..305fa46532 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -252,6 +252,8 @@ extern const FFInputFormat ff_kvag_demuxer; extern const FFOutputFormat ff_kvag_muxer; extern const FFInputFormat ff_laf_demuxer; extern const FFOutputFormat ff_latm_muxer; +extern const FFInputFormat ff_lc3_demuxer; +extern const FFOutputFormat ff_lc3_muxer; extern const FFInputFormat ff_lmlm4_demuxer; extern const FFInputFormat ff_loas_demuxer; extern const FFInputFormat ff_luodat_demuxer; diff --git a/libavformat/lc3.c b/libavformat/lc3.c new file mode 100644 index 0000000000..93ce720af3 --- /dev/null +++ b/libavformat/lc3.c @@ -0,0 +1,252 @@ +/* + * LC3 muxer and demuxer + * Copyright (C) 2024 Antoine Soulier + * + * 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 + */ + +/** + * @file + * Based on the file format specified by : + * + * - Bluetooth SIG - Low Complexity Communication Codec Test Suite + * https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=502301 + * 3.2.8.2 Reference LC3 Codec Bitstream Format + * + * - ETSI TI 103 634 V1.4.1 - Low Complexity Communication Codec plus + * https://www.etsi.org/deliver/etsi_ts/103600_103699/103634/01.04.01_60/ts_103634v010401p.pdf + * LC3plus conformance script package + */ + +#include "config_components.h" + +#include "libavcodec/packet.h" +#include "libavutil/intreadwrite.h" + +#include "avformat.h" +#include "avio.h" +#include "demux.h" +#include "internal.h" +#include "mux.h" + +static int check_frame_length(void *avcl, int srate_hz, int frame_us) +{ + if (srate_hz != 8000 && srate_hz != 16000 && srate_hz != 24000 && + srate_hz != 32000 && srate_hz != 48000 && srate_hz != 96000) { + if (avcl) + av_log(avcl, AV_LOG_ERROR, + "Invalid LC3 sample rate: %d Hz.\n", srate_hz); + return -1; + } + + if (frame_us != 2500 && frame_us != 5000 && + frame_us != 7500 && frame_us != 10000) { + if (avcl) + av_log(avcl, AV_LOG_ERROR, + "Invalid LC3 frame duration: %.1f ms.\n", frame_us / 1000.f); + return -1; + } + + return 0; +} + +#if CONFIG_LC3_DEMUXER + +typedef struct LC3DemuxContext { + int frame_samples; + int64_t end_dts; +} LC3DemuxContext; + +static int lc3_read_probe(const AVProbeData *p) +{ + int frame_us, srate_hz; + + if (p->buf_size < 12) + return 0; + + if (AV_RB16(p->buf + 0) != 0x1ccc || + AV_RL16(p->buf + 2) < 9 * sizeof(uint16_t)) + return 0; + + srate_hz = AV_RL16(p->buf + 4) * 100; + frame_us = AV_RL16(p->buf + 10) * 10; + if (check_frame_length(NULL, srate_hz, frame_us) < 0) + return 0; + + return AVPROBE_SCORE_MAX; +} + +static int lc3_read_header(AVFormatContext *s) +{ + LC3DemuxContext *lc3 = s->priv_data; + AVStream *st = NULL; + uint16_t tag, hdr_size; + uint32_t length; + int srate_hz, frame_us, channels, bit_rate; + int ep_mode, hr_mode; + int num_extra_params; + int delay, ret; + + tag = avio_rb16(s->pb); + hdr_size = avio_rl16(s->pb); + + if (tag != 0x1ccc || hdr_size < 9 * sizeof(uint16_t)) + return AVERROR_INVALIDDATA; + + num_extra_params = hdr_size / sizeof(uint16_t) - 9; + + srate_hz = avio_rl16(s->pb) * 100; + bit_rate = avio_rl16(s->pb) * 100; + channels = avio_rl16(s->pb); + frame_us = avio_rl16(s->pb) * 10; + ep_mode = avio_rl16(s->pb) != 0; + length = avio_rl32(s->pb); + hr_mode = num_extra_params >= 1 && avio_rl16(s->pb); + + if (check_frame_length(s, srate_hz, frame_us) < 0) + return AVERROR_INVALIDDATA; + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + avpriv_set_pts_info(st, 64, 1, srate_hz); + avpriv_update_cur_dts(s, st, 0); + st->duration = length; + + st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; + st->codecpar->codec_id = AV_CODEC_ID_LC3; + st->codecpar->sample_rate = srate_hz; + st->codecpar->bit_rate = bit_rate; + st->codecpar->ch_layout.nb_channels = channels; + + if ((ret = ff_alloc_extradata(st->codecpar, 6)) < 0) + return ret; + + AV_WL16(st->codecpar->extradata + 0, frame_us / 10); + AV_WL16(st->codecpar->extradata + 2, ep_mode); + AV_WL16(st->codecpar->extradata + 4, hr_mode); + + lc3->frame_samples = av_rescale(frame_us, srate_hz, 1000*1000); + + delay = av_rescale(frame_us == 7500 ? 4000 : 2500, srate_hz, 1000*1000); + lc3->end_dts = length ? length + delay : -1; + + return 0; +} + +static int lc3_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + LC3DemuxContext *lc3 = s->priv_data; + AVStream *st = s->streams[0]; + AVIOContext *pb = s->pb; + int64_t pos = avio_tell(pb); + int64_t remaining_samples; + int ret; + + ret = av_get_packet(s->pb, pkt, avio_rl16(pb)); + if (ret < 0) + return ret; + + pkt->pos = pos; + + remaining_samples = lc3->end_dts < 0 ? lc3->frame_samples : + FFMAX(lc3->end_dts - ffstream(st)->cur_dts, 0); + pkt->duration = FFMIN(lc3->frame_samples, remaining_samples); + + return 0; +} + +const FFInputFormat ff_lc3_demuxer = { + .p.name = "lc3", + .p.long_name = NULL_IF_CONFIG_SMALL("LC3 (Low Complexity Communication Codec)"), + .p.extensions = "lc3", + .p.flags = AVFMT_GENERIC_INDEX, + .priv_data_size = sizeof(LC3DemuxContext), + .read_probe = lc3_read_probe, + .read_header = lc3_read_header, + .read_packet = lc3_read_packet, +}; + +#endif /* CONFIG_LC3_DEMUXER */ + +#if CONFIG_LC3_MUXER + +static av_cold int lc3_muxer_init(AVFormatContext *s) +{ + if (s->nb_streams != 1) { + av_log(s, AV_LOG_ERROR, "This muxer only supports a single stream.\n"); + return AVERROR(EINVAL); + } + + return 0; +} + +static int lc3_write_header(AVFormatContext *s) +{ + AVStream *st = s->streams[0]; + int channels = st->codecpar->ch_layout.nb_channels; + int srate_hz = st->codecpar->sample_rate; + int bit_rate = st->codecpar->bit_rate; + int frame_us, ep_mode, hr_mode; + uint32_t nb_samples = av_rescale_q( + st->duration, st->time_base, (AVRational){ 1, srate_hz }); + + if (st->codecpar->extradata_size < 6) + return AVERROR_INVALIDDATA; + + frame_us = AV_RL16(st->codecpar->extradata + 0) * 10; + ep_mode = AV_RL16(st->codecpar->extradata + 2) != 0; + hr_mode = AV_RL16(st->codecpar->extradata + 4) != 0; + + if (check_frame_length(s, srate_hz, frame_us) < 0) + return AVERROR_INVALIDDATA; + + avio_wb16(s->pb, 0x1ccc); + avio_wl16(s->pb, (9 + hr_mode) * sizeof(uint16_t)); + avio_wl16(s->pb, srate_hz / 100); + avio_wl16(s->pb, bit_rate / 100); + avio_wl16(s->pb, channels); + avio_wl16(s->pb, frame_us / 10); + avio_wl16(s->pb, ep_mode); + avio_wl32(s->pb, nb_samples); + if (hr_mode) + avio_wl16(s->pb, hr_mode); + + return 0; +} + +static int lc3_write_packet(AVFormatContext *s, AVPacket *pkt) +{ + avio_wl16(s->pb, pkt->size); + avio_write(s->pb, pkt->data, pkt->size); + return 0; +} + +const FFOutputFormat ff_lc3_muxer = { + .p.name = "lc3", + .p.long_name = NULL_IF_CONFIG_SMALL("LC3 (Low Complexity Communication Codec)"), + .p.extensions = "lc3", + .p.audio_codec = AV_CODEC_ID_LC3, + .p.video_codec = AV_CODEC_ID_NONE, + .p.flags = AVFMT_NOTIMESTAMPS, + .init = lc3_muxer_init, + .write_header = lc3_write_header, + .write_packet = lc3_write_packet, +}; + +#endif /* CONFIG_LC3_MUXER */