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 */ 34static 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 71int 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 90int 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 132const 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 143enum 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} 153