| 1 | /* |
| 2 | * RTP input/output format |
| 3 | * Copyright (c) 2002 Fabrice Bellard |
| 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 "libavutil/avstring.h" |
| 23 | #include "libavutil/opt.h" |
| 24 | #include "avformat.h" |
| 25 | |
| 26 | #include "rtp.h" |
| 27 | |
| 28 | /* from http://www.iana.org/assignments/rtp-parameters last updated 05 January 2005 */ |
| 29 | /* payload types >= 96 are dynamic; |
| 30 | * payload types between 72 and 76 are reserved for RTCP conflict avoidance; |
| 31 | * all the other payload types not present in the table are unassigned or |
| 32 | * reserved |
| 33 | */ |
| 34 | static const struct { |
| 35 | int pt; |
| 36 | const char enc_name[6]; |
| 37 | enum AVMediaType codec_type; |
| 38 | enum AVCodecID codec_id; |
| 39 | int clock_rate; |
| 40 | int audio_channels; |
| 41 | } rtp_payload_types[] = { |
| 42 | {0, "PCMU", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_MULAW, 8000, 1}, |
| 43 | {3, "GSM", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1}, |
| 44 | {4, "G723", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_G723_1, 8000, 1}, |
| 45 | {5, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1}, |
| 46 | {6, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 16000, 1}, |
| 47 | {7, "LPC", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1}, |
| 48 | {8, "PCMA", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_ALAW, 8000, 1}, |
| 49 | {9, "G722", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_ADPCM_G722, 8000, 1}, |
| 50 | {10, "L16", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_S16BE, 44100, 2}, |
| 51 | {11, "L16", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_S16BE, 44100, 1}, |
| 52 | {12, "QCELP", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_QCELP, 8000, 1}, |
| 53 | {13, "CN", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1}, |
| 54 | {14, "MPA", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP2, -1, -1}, |
| 55 | {14, "MPA", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3, -1, -1}, |
| 56 | {15, "G728", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1}, |
| 57 | {16, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 11025, 1}, |
| 58 | {17, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 22050, 1}, |
| 59 | {18, "G729", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1}, |
| 60 | {25, "CelB", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_NONE, 90000, -1}, |
| 61 | {26, "JPEG", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MJPEG, 90000, -1}, |
| 62 | {28, "nv", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_NONE, 90000, -1}, |
| 63 | {31, "H261", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H261, 90000, -1}, |
| 64 | {32, "MPV", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG1VIDEO, 90000, -1}, |
| 65 | {32, "MPV", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO, 90000, -1}, |
| 66 | {33, "MP2T", AVMEDIA_TYPE_DATA, AV_CODEC_ID_MPEG2TS, 90000, -1}, |
| 67 | {34, "H263", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H263, 90000, -1}, |
| 68 | {-1, "", AVMEDIA_TYPE_UNKNOWN, AV_CODEC_ID_NONE, -1, -1} |
| 69 | }; |
| 70 | |
| 71 | int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type) |
| 72 | { |
| 73 | int i = 0; |
| 74 | |
| 75 | for (i = 0; rtp_payload_types[i].pt >= 0; i++) |
| 76 | if (rtp_payload_types[i].pt == payload_type) { |
| 77 | if (rtp_payload_types[i].codec_id != AV_CODEC_ID_NONE) { |
| 78 | codec->codec_type = rtp_payload_types[i].codec_type; |
| 79 | codec->codec_id = rtp_payload_types[i].codec_id; |
| 80 | if (rtp_payload_types[i].audio_channels > 0) |
| 81 | codec->channels = rtp_payload_types[i].audio_channels; |
| 82 | if (rtp_payload_types[i].clock_rate > 0) |
| 83 | codec->sample_rate = rtp_payload_types[i].clock_rate; |
| 84 | return 0; |
| 85 | } |
| 86 | } |
| 87 | return -1; |
| 88 | } |
| 89 | |
| 90 | int ff_rtp_get_payload_type(AVFormatContext *fmt, |
| 91 | AVCodecContext *codec, int idx) |
| 92 | { |
| 93 | int i; |
| 94 | AVOutputFormat *ofmt = fmt ? fmt->oformat : NULL; |
| 95 | |
| 96 | /* Was the payload type already specified for the RTP muxer? */ |
| 97 | if (ofmt && ofmt->priv_class && fmt->priv_data) { |
| 98 | int64_t payload_type; |
| 99 | if (av_opt_get_int(fmt->priv_data, "payload_type", 0, &payload_type) >= 0 && |
| 100 | payload_type >= 0) |
| 101 | return (int)payload_type; |
| 102 | } |
| 103 | |
| 104 | /* static payload type */ |
| 105 | for (i = 0; rtp_payload_types[i].pt >= 0; ++i) |
| 106 | if (rtp_payload_types[i].codec_id == codec->codec_id) { |
| 107 | if (codec->codec_id == AV_CODEC_ID_H263 && (!fmt || !fmt->oformat || |
| 108 | !fmt->oformat->priv_class || !fmt->priv_data || |
| 109 | !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190"))) |
| 110 | continue; |
| 111 | /* G722 has 8000 as nominal rate even if the sample rate is 16000, |
| 112 | * see section 4.5.2 in RFC 3551. */ |
| 113 | if (codec->codec_id == AV_CODEC_ID_ADPCM_G722 && |
| 114 | codec->sample_rate == 16000 && codec->channels == 1) |
| 115 | return rtp_payload_types[i].pt; |
| 116 | if (codec->codec_type == AVMEDIA_TYPE_AUDIO && |
| 117 | ((rtp_payload_types[i].clock_rate > 0 && |
| 118 | codec->sample_rate != rtp_payload_types[i].clock_rate) || |
| 119 | (rtp_payload_types[i].audio_channels > 0 && |
| 120 | codec->channels != rtp_payload_types[i].audio_channels))) |
| 121 | continue; |
| 122 | return rtp_payload_types[i].pt; |
| 123 | } |
| 124 | |
| 125 | if (idx < 0) |
| 126 | idx = codec->codec_type == AVMEDIA_TYPE_AUDIO; |
| 127 | |
| 128 | /* dynamic payload type */ |
| 129 | return RTP_PT_PRIVATE + idx; |
| 130 | } |
| 131 | |
| 132 | const char *ff_rtp_enc_name(int payload_type) |
| 133 | { |
| 134 | int i; |
| 135 | |
| 136 | for (i = 0; rtp_payload_types[i].pt >= 0; i++) |
| 137 | if (rtp_payload_types[i].pt == payload_type) |
| 138 | return rtp_payload_types[i].enc_name; |
| 139 | |
| 140 | return ""; |
| 141 | } |
| 142 | |
| 143 | enum AVCodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type) |
| 144 | { |
| 145 | int i; |
| 146 | |
| 147 | for (i = 0; rtp_payload_types[i].pt >= 0; i++) |
| 148 | if (!av_strcasecmp(buf, rtp_payload_types[i].enc_name) && (codec_type == rtp_payload_types[i].codec_type)) |
| 149 | return rtp_payload_types[i].codec_id; |
| 150 | |
| 151 | return AV_CODEC_ID_NONE; |
| 152 | } |