| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * LC3 muxer and demuxer | ||
| 3 | * Copyright (C) 2024 Antoine Soulier <asoulier@google.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 | /** | ||
| 23 | * @file | ||
| 24 | * Based on the file format specified by : | ||
| 25 | * | ||
| 26 | * - Bluetooth SIG - Low Complexity Communication Codec Test Suite | ||
| 27 | * https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=502301 | ||
| 28 | * 3.2.8.2 Reference LC3 Codec Bitstream Format | ||
| 29 | * | ||
| 30 | * - ETSI TI 103 634 V1.4.1 - Low Complexity Communication Codec plus | ||
| 31 | * https://www.etsi.org/deliver/etsi_ts/103600_103699/103634/01.04.01_60/ts_103634v010401p.pdf | ||
| 32 | * LC3plus conformance script package | ||
| 33 | */ | ||
| 34 | |||
| 35 | #include "config_components.h" | ||
| 36 | |||
| 37 | #include "libavcodec/packet.h" | ||
| 38 | #include "libavutil/intreadwrite.h" | ||
| 39 | |||
| 40 | #include "avformat.h" | ||
| 41 | #include "avio.h" | ||
| 42 | #include "demux.h" | ||
| 43 | #include "internal.h" | ||
| 44 | #include "mux.h" | ||
| 45 | |||
| 46 | ✗ | static int check_frame_length(void *avcl, int srate_hz, int frame_us) | |
| 47 | { | ||
| 48 | ✗ | if (srate_hz != 8000 && srate_hz != 16000 && srate_hz != 24000 && | |
| 49 | ✗ | srate_hz != 32000 && srate_hz != 48000 && srate_hz != 96000) { | |
| 50 | ✗ | if (avcl) | |
| 51 | ✗ | av_log(avcl, AV_LOG_ERROR, | |
| 52 | "Invalid LC3 sample rate: %d Hz.\n", srate_hz); | ||
| 53 | ✗ | return -1; | |
| 54 | } | ||
| 55 | |||
| 56 | ✗ | if (frame_us != 2500 && frame_us != 5000 && | |
| 57 | ✗ | frame_us != 7500 && frame_us != 10000) { | |
| 58 | ✗ | if (avcl) | |
| 59 | ✗ | av_log(avcl, AV_LOG_ERROR, | |
| 60 | ✗ | "Invalid LC3 frame duration: %.1f ms.\n", frame_us / 1000.f); | |
| 61 | ✗ | return -1; | |
| 62 | } | ||
| 63 | |||
| 64 | ✗ | return 0; | |
| 65 | } | ||
| 66 | |||
| 67 | #if CONFIG_LC3_DEMUXER | ||
| 68 | |||
| 69 | typedef struct LC3DemuxContext { | ||
| 70 | int frame_samples; | ||
| 71 | int64_t end_dts; | ||
| 72 | } LC3DemuxContext; | ||
| 73 | |||
| 74 | 7128 | static int lc3_read_probe(const AVProbeData *p) | |
| 75 | { | ||
| 76 | int frame_us, srate_hz; | ||
| 77 | |||
| 78 |
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7128 | if (p->buf_size < 12) |
| 79 | ✗ | return 0; | |
| 80 | |||
| 81 |
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7128 | if (AV_RB16(p->buf + 0) != 0x1ccc || |
| 82 | ✗ | AV_RL16(p->buf + 2) < 9 * sizeof(uint16_t)) | |
| 83 | 7128 | return 0; | |
| 84 | |||
| 85 | ✗ | srate_hz = AV_RL16(p->buf + 4) * 100; | |
| 86 | ✗ | frame_us = AV_RL16(p->buf + 10) * 10; | |
| 87 | ✗ | if (check_frame_length(NULL, srate_hz, frame_us) < 0) | |
| 88 | ✗ | return 0; | |
| 89 | |||
| 90 | ✗ | return AVPROBE_SCORE_MAX; | |
| 91 | } | ||
| 92 | |||
| 93 | ✗ | static int lc3_read_header(AVFormatContext *s) | |
| 94 | { | ||
| 95 | ✗ | LC3DemuxContext *lc3 = s->priv_data; | |
| 96 | ✗ | AVStream *st = NULL; | |
| 97 | uint16_t tag, hdr_size; | ||
| 98 | uint32_t length; | ||
| 99 | int srate_hz, frame_us, channels, bit_rate; | ||
| 100 | int ep_mode, hr_mode; | ||
| 101 | int num_extra_params; | ||
| 102 | int delay, ret; | ||
| 103 | |||
| 104 | ✗ | tag = avio_rb16(s->pb); | |
| 105 | ✗ | hdr_size = avio_rl16(s->pb); | |
| 106 | |||
| 107 | ✗ | if (tag != 0x1ccc || hdr_size < 9 * sizeof(uint16_t)) | |
| 108 | ✗ | return AVERROR_INVALIDDATA; | |
| 109 | |||
| 110 | ✗ | num_extra_params = hdr_size / sizeof(uint16_t) - 9; | |
| 111 | |||
| 112 | ✗ | srate_hz = avio_rl16(s->pb) * 100; | |
| 113 | ✗ | bit_rate = avio_rl16(s->pb) * 100; | |
| 114 | ✗ | channels = avio_rl16(s->pb); | |
| 115 | ✗ | frame_us = avio_rl16(s->pb) * 10; | |
| 116 | ✗ | ep_mode = avio_rl16(s->pb) != 0; | |
| 117 | ✗ | length = avio_rl32(s->pb); | |
| 118 | ✗ | hr_mode = num_extra_params >= 1 && avio_rl16(s->pb); | |
| 119 | |||
| 120 | ✗ | if (check_frame_length(s, srate_hz, frame_us) < 0) | |
| 121 | ✗ | return AVERROR_INVALIDDATA; | |
| 122 | |||
| 123 | ✗ | st = avformat_new_stream(s, NULL); | |
| 124 | ✗ | if (!st) | |
| 125 | ✗ | return AVERROR(ENOMEM); | |
| 126 | |||
| 127 | ✗ | avpriv_set_pts_info(st, 64, 1, srate_hz); | |
| 128 | ✗ | avpriv_update_cur_dts(s, st, 0); | |
| 129 | ✗ | st->duration = length; | |
| 130 | |||
| 131 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 132 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_LC3; | |
| 133 | ✗ | st->codecpar->sample_rate = srate_hz; | |
| 134 | ✗ | st->codecpar->bit_rate = bit_rate; | |
| 135 | ✗ | st->codecpar->ch_layout.nb_channels = channels; | |
| 136 | |||
| 137 | ✗ | if ((ret = ff_alloc_extradata(st->codecpar, 6)) < 0) | |
| 138 | ✗ | return ret; | |
| 139 | |||
| 140 | ✗ | AV_WL16(st->codecpar->extradata + 0, frame_us / 10); | |
| 141 | ✗ | AV_WL16(st->codecpar->extradata + 2, ep_mode); | |
| 142 | ✗ | AV_WL16(st->codecpar->extradata + 4, hr_mode); | |
| 143 | |||
| 144 | ✗ | lc3->frame_samples = av_rescale(frame_us, srate_hz, 1000*1000); | |
| 145 | |||
| 146 | ✗ | delay = av_rescale(frame_us == 7500 ? 4000 : 2500, srate_hz, 1000*1000); | |
| 147 | ✗ | lc3->end_dts = length ? length + delay : -1; | |
| 148 | |||
| 149 | ✗ | return 0; | |
| 150 | } | ||
| 151 | |||
| 152 | ✗ | static int lc3_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 153 | { | ||
| 154 | ✗ | LC3DemuxContext *lc3 = s->priv_data; | |
| 155 | ✗ | AVStream *st = s->streams[0]; | |
| 156 | ✗ | AVIOContext *pb = s->pb; | |
| 157 | ✗ | int64_t pos = avio_tell(pb); | |
| 158 | int64_t remaining_samples; | ||
| 159 | int ret; | ||
| 160 | |||
| 161 | ✗ | ret = av_get_packet(s->pb, pkt, avio_rl16(pb)); | |
| 162 | ✗ | if (ret < 0) | |
| 163 | ✗ | return ret; | |
| 164 | |||
| 165 | ✗ | pkt->pos = pos; | |
| 166 | |||
| 167 | ✗ | remaining_samples = lc3->end_dts < 0 ? lc3->frame_samples : | |
| 168 | ✗ | FFMAX(lc3->end_dts - ffstream(st)->cur_dts, 0); | |
| 169 | ✗ | pkt->duration = FFMIN(lc3->frame_samples, remaining_samples); | |
| 170 | |||
| 171 | ✗ | return 0; | |
| 172 | } | ||
| 173 | |||
| 174 | const FFInputFormat ff_lc3_demuxer = { | ||
| 175 | .p.name = "lc3", | ||
| 176 | .p.long_name = NULL_IF_CONFIG_SMALL("LC3 (Low Complexity Communication Codec)"), | ||
| 177 | .p.extensions = "lc3", | ||
| 178 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 179 | .priv_data_size = sizeof(LC3DemuxContext), | ||
| 180 | .read_probe = lc3_read_probe, | ||
| 181 | .read_header = lc3_read_header, | ||
| 182 | .read_packet = lc3_read_packet, | ||
| 183 | }; | ||
| 184 | |||
| 185 | #endif /* CONFIG_LC3_DEMUXER */ | ||
| 186 | |||
| 187 | #if CONFIG_LC3_MUXER | ||
| 188 | |||
| 189 | ✗ | static int lc3_write_header(AVFormatContext *s) | |
| 190 | { | ||
| 191 | ✗ | AVStream *st = s->streams[0]; | |
| 192 | ✗ | int channels = st->codecpar->ch_layout.nb_channels; | |
| 193 | ✗ | int srate_hz = st->codecpar->sample_rate; | |
| 194 | ✗ | int bit_rate = st->codecpar->bit_rate; | |
| 195 | int frame_us, ep_mode, hr_mode; | ||
| 196 | ✗ | uint32_t nb_samples = av_rescale_q( | |
| 197 | ✗ | st->duration, st->time_base, (AVRational){ 1, srate_hz }); | |
| 198 | |||
| 199 | ✗ | if (st->codecpar->extradata_size < 6) | |
| 200 | ✗ | return AVERROR_INVALIDDATA; | |
| 201 | |||
| 202 | ✗ | frame_us = AV_RL16(st->codecpar->extradata + 0) * 10; | |
| 203 | ✗ | ep_mode = AV_RL16(st->codecpar->extradata + 2) != 0; | |
| 204 | ✗ | hr_mode = AV_RL16(st->codecpar->extradata + 4) != 0; | |
| 205 | |||
| 206 | ✗ | if (check_frame_length(s, srate_hz, frame_us) < 0) | |
| 207 | ✗ | return AVERROR_INVALIDDATA; | |
| 208 | |||
| 209 | ✗ | avio_wb16(s->pb, 0x1ccc); | |
| 210 | ✗ | avio_wl16(s->pb, (9 + hr_mode) * sizeof(uint16_t)); | |
| 211 | ✗ | avio_wl16(s->pb, srate_hz / 100); | |
| 212 | ✗ | avio_wl16(s->pb, bit_rate / 100); | |
| 213 | ✗ | avio_wl16(s->pb, channels); | |
| 214 | ✗ | avio_wl16(s->pb, frame_us / 10); | |
| 215 | ✗ | avio_wl16(s->pb, ep_mode); | |
| 216 | ✗ | avio_wl32(s->pb, nb_samples); | |
| 217 | ✗ | if (hr_mode) | |
| 218 | ✗ | avio_wl16(s->pb, hr_mode); | |
| 219 | |||
| 220 | ✗ | return 0; | |
| 221 | } | ||
| 222 | |||
| 223 | ✗ | static int lc3_write_packet(AVFormatContext *s, AVPacket *pkt) | |
| 224 | { | ||
| 225 | ✗ | avio_wl16(s->pb, pkt->size); | |
| 226 | ✗ | avio_write(s->pb, pkt->data, pkt->size); | |
| 227 | ✗ | return 0; | |
| 228 | } | ||
| 229 | |||
| 230 | const FFOutputFormat ff_lc3_muxer = { | ||
| 231 | .p.name = "lc3", | ||
| 232 | .p.long_name = NULL_IF_CONFIG_SMALL("LC3 (Low Complexity Communication Codec)"), | ||
| 233 | .p.extensions = "lc3", | ||
| 234 | .p.audio_codec = AV_CODEC_ID_LC3, | ||
| 235 | .p.video_codec = AV_CODEC_ID_NONE, | ||
| 236 | .p.subtitle_codec = AV_CODEC_ID_NONE, | ||
| 237 | .p.flags = AVFMT_NOTIMESTAMPS, | ||
| 238 | .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH | | ||
| 239 | FF_OFMT_FLAG_ONLY_DEFAULT_CODECS, | ||
| 240 | .write_header = lc3_write_header, | ||
| 241 | .write_packet = lc3_write_packet, | ||
| 242 | }; | ||
| 243 | |||
| 244 | #endif /* CONFIG_LC3_MUXER */ | ||
| 245 |