| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RTP Depacketization of Opus, RFC 7587 | ||
| 3 | * Copyright (c) 2025 Jonathan Baudanza <jon@jonb.org> | ||
| 4 | * Copyright (c) 2022 Erik Linge | ||
| 5 | * | ||
| 6 | * This file is part of FFmpeg. | ||
| 7 | * | ||
| 8 | * FFmpeg is free software; you can redistribute it and/or | ||
| 9 | * modify it under the terms of the GNU Lesser General Public | ||
| 10 | * License as published by the Free Software Foundation; either | ||
| 11 | * version 2.1 of the License, or (at your option) any later version. | ||
| 12 | * | ||
| 13 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 16 | * Lesser General Public License for more details. | ||
| 17 | * | ||
| 18 | * You should have received a copy of the GNU Lesser General Public | ||
| 19 | * License along with FFmpeg; if not, write to the Free Software | ||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 21 | */ | ||
| 22 | |||
| 23 | #include "libavcodec/bytestream.h" | ||
| 24 | #include "libavutil/mem.h" | ||
| 25 | #include "libavutil/avstring.h" | ||
| 26 | #include "rtpdec_formats.h" | ||
| 27 | #include "internal.h" | ||
| 28 | |||
| 29 | ✗ | static int opus_duration(const uint8_t *src, int size) | |
| 30 | { | ||
| 31 | ✗ | unsigned nb_frames = 1; | |
| 32 | ✗ | unsigned toc = src[0]; | |
| 33 | ✗ | unsigned toc_config = toc >> 3; | |
| 34 | ✗ | unsigned toc_count = toc & 3; | |
| 35 | ✗ | unsigned frame_size = toc_config < 12 ? FFMAX(480, 960 * (toc_config & 3)) : | |
| 36 | ✗ | toc_config < 16 ? 480 << (toc_config & 1) : | |
| 37 | ✗ | 120 << (toc_config & 3); | |
| 38 | ✗ | if (toc_count == 3) { | |
| 39 | ✗ | if (size<2) | |
| 40 | ✗ | return AVERROR_INVALIDDATA; | |
| 41 | ✗ | nb_frames = src[1] & 0x3F; | |
| 42 | ✗ | } else if (toc_count) { | |
| 43 | ✗ | nb_frames = 2; | |
| 44 | } | ||
| 45 | |||
| 46 | ✗ | return frame_size * nb_frames; | |
| 47 | } | ||
| 48 | |||
| 49 | ✗ | static int opus_write_extradata(AVCodecParameters *codecpar) | |
| 50 | { | ||
| 51 | uint8_t *bs; | ||
| 52 | int ret; | ||
| 53 | |||
| 54 | /* This function writes an extradata with a channel mapping family of 0. | ||
| 55 | * This mapping family only supports mono and stereo layouts. And RFC7587 | ||
| 56 | * specifies that the number of channels in the SDP must be 2. | ||
| 57 | */ | ||
| 58 | ✗ | if (codecpar->ch_layout.nb_channels > 2) { | |
| 59 | ✗ | return AVERROR_INVALIDDATA; | |
| 60 | } | ||
| 61 | |||
| 62 | ✗ | ret = ff_alloc_extradata(codecpar, 19); | |
| 63 | ✗ | if (ret < 0) | |
| 64 | ✗ | return ret; | |
| 65 | |||
| 66 | ✗ | bs = (uint8_t *)codecpar->extradata; | |
| 67 | |||
| 68 | /* Opus magic */ | ||
| 69 | ✗ | bytestream_put_buffer(&bs, "OpusHead", 8); | |
| 70 | /* Version */ | ||
| 71 | ✗ | bytestream_put_byte (&bs, 0x1); | |
| 72 | /* Channel count */ | ||
| 73 | ✗ | bytestream_put_byte (&bs, codecpar->ch_layout.nb_channels); | |
| 74 | /* Pre skip */ | ||
| 75 | ✗ | bytestream_put_le16 (&bs, 0); | |
| 76 | /* Input sample rate */ | ||
| 77 | ✗ | bytestream_put_le32 (&bs, 48000); | |
| 78 | /* Output gain */ | ||
| 79 | ✗ | bytestream_put_le16 (&bs, 0x0); | |
| 80 | /* Mapping family */ | ||
| 81 | ✗ | bytestream_put_byte (&bs, 0x0); | |
| 82 | |||
| 83 | ✗ | return 0; | |
| 84 | } | ||
| 85 | |||
| 86 | ✗ | static int opus_init(AVFormatContext *s, int st_index, PayloadContext *priv_data) | |
| 87 | { | ||
| 88 | ✗ | return opus_write_extradata(s->streams[st_index]->codecpar); | |
| 89 | } | ||
| 90 | |||
| 91 | ✗ | static int opus_parse_packet(AVFormatContext *ctx, PayloadContext *data, | |
| 92 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, | ||
| 93 | const uint8_t *buf, int len, uint16_t seq, | ||
| 94 | int flags) | ||
| 95 | { | ||
| 96 | int rv; | ||
| 97 | int duration; | ||
| 98 | |||
| 99 | ✗ | if (!len) | |
| 100 | ✗ | return AVERROR_INVALIDDATA; | |
| 101 | |||
| 102 | ✗ | if ((rv = av_new_packet(pkt, len)) < 0) | |
| 103 | ✗ | return rv; | |
| 104 | |||
| 105 | ✗ | memcpy(pkt->data, buf, len); | |
| 106 | ✗ | pkt->stream_index = st->index; | |
| 107 | |||
| 108 | ✗ | duration = opus_duration(buf, len); | |
| 109 | ✗ | if (duration != AVERROR_INVALIDDATA) { | |
| 110 | ✗ | pkt->duration = duration; | |
| 111 | } | ||
| 112 | |||
| 113 | ✗ | return 0; | |
| 114 | } | ||
| 115 | |||
| 116 | ✗ | static int parse_fmtp(AVFormatContext *s, | |
| 117 | AVStream *stream, PayloadContext *data, | ||
| 118 | const char *attr, const char *value) | ||
| 119 | { | ||
| 120 | ✗ | if (!strcmp(attr, "sprop-maxcapturerate")) { | |
| 121 | ✗ | int rate = atoi(value); | |
| 122 | ✗ | if (rate < 8000 || rate > 48000) { | |
| 123 | ✗ | av_log(s, AV_LOG_ERROR, | |
| 124 | "fmtp field 'sprop-maxcapturerate' must be between 8000 to 48000 (provided value: %s)", | ||
| 125 | value); | ||
| 126 | ✗ | return AVERROR_INVALIDDATA; | |
| 127 | } | ||
| 128 | ✗ | stream->codecpar->sample_rate = rate; | |
| 129 | } | ||
| 130 | ✗ | return 0; | |
| 131 | } | ||
| 132 | |||
| 133 | ✗ | static int opus_parse_sdp_line(AVFormatContext *s, int st_index, | |
| 134 | PayloadContext *data, const char *line) | ||
| 135 | { | ||
| 136 | const char *p; | ||
| 137 | |||
| 138 | ✗ | if (st_index < 0) | |
| 139 | ✗ | return 0; | |
| 140 | |||
| 141 | ✗ | if (av_strstart(line, "fmtp:", &p)) { | |
| 142 | ✗ | return ff_parse_fmtp(s, s->streams[st_index], data, p, parse_fmtp); | |
| 143 | } | ||
| 144 | ✗ | return 0; | |
| 145 | } | ||
| 146 | |||
| 147 | const RTPDynamicProtocolHandler ff_opus_dynamic_handler = { | ||
| 148 | .enc_name = "opus", | ||
| 149 | .codec_type = AVMEDIA_TYPE_AUDIO, | ||
| 150 | .codec_id = AV_CODEC_ID_OPUS, | ||
| 151 | .parse_packet = opus_parse_packet, | ||
| 152 | .init = opus_init, | ||
| 153 | .parse_sdp_a_line = opus_parse_sdp_line, | ||
| 154 | }; | ||
| 155 |