1/* 2 * RTP input/output format 3 * Copyright (c) 2002 Fabrice Bellard 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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/opt.h> 23#include "avformat.h" 24 25#include "rtp.h" 26 27//#define DEBUG 28 29/* from http://www.iana.org/assignments/rtp-parameters last updated 05 January 2005 */ 30/* payload types >= 96 are dynamic; 31 * payload types between 72 and 76 are reserved for RTCP conflict avoidance; 32 * all the other payload types not present in the table are unassigned or 33 * reserved 34 */ 35static const struct 36{ 37 int pt; 38 const char enc_name[6]; 39 enum AVMediaType codec_type; 40 enum CodecID codec_id; 41 int clock_rate; 42 int audio_channels; 43} AVRtpPayloadTypes[]= 44{ 45 {0, "PCMU", AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_MULAW, 8000, 1}, 46 {3, "GSM", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 47 {4, "G723", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 48 {5, "DVI4", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 49 {6, "DVI4", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 16000, 1}, 50 {7, "LPC", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 51 {8, "PCMA", AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_ALAW, 8000, 1}, 52 {9, "G722", AVMEDIA_TYPE_AUDIO, CODEC_ID_ADPCM_G722, 8000, 1}, 53 {10, "L16", AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_S16BE, 44100, 2}, 54 {11, "L16", AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_S16BE, 44100, 1}, 55 {12, "QCELP", AVMEDIA_TYPE_AUDIO, CODEC_ID_QCELP, 8000, 1}, 56 {13, "CN", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 57 {14, "MPA", AVMEDIA_TYPE_AUDIO, CODEC_ID_MP2, -1, -1}, 58 {14, "MPA", AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3, -1, -1}, 59 {15, "G728", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 60 {16, "DVI4", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 11025, 1}, 61 {17, "DVI4", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 22050, 1}, 62 {18, "G729", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 63 {25, "CelB", AVMEDIA_TYPE_VIDEO, CODEC_ID_NONE, 90000, -1}, 64 {26, "JPEG", AVMEDIA_TYPE_VIDEO, CODEC_ID_MJPEG, 90000, -1}, 65 {28, "nv", AVMEDIA_TYPE_VIDEO, CODEC_ID_NONE, 90000, -1}, 66 {31, "H261", AVMEDIA_TYPE_VIDEO, CODEC_ID_H261, 90000, -1}, 67 {32, "MPV", AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG1VIDEO, 90000, -1}, 68 {32, "MPV", AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO, 90000, -1}, 69 {33, "MP2T", AVMEDIA_TYPE_DATA, CODEC_ID_MPEG2TS, 90000, -1}, 70 {34, "H263", AVMEDIA_TYPE_VIDEO, CODEC_ID_H263, 90000, -1}, 71 {-1, "", AVMEDIA_TYPE_UNKNOWN, CODEC_ID_NONE, -1, -1} 72}; 73 74int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type) 75{ 76 int i = 0; 77 78 for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++) 79 if (AVRtpPayloadTypes[i].pt == payload_type) { 80 if (AVRtpPayloadTypes[i].codec_id != CODEC_ID_NONE) { 81 codec->codec_type = AVRtpPayloadTypes[i].codec_type; 82 codec->codec_id = AVRtpPayloadTypes[i].codec_id; 83 if (AVRtpPayloadTypes[i].audio_channels > 0) 84 codec->channels = AVRtpPayloadTypes[i].audio_channels; 85 if (AVRtpPayloadTypes[i].clock_rate > 0) 86 codec->sample_rate = AVRtpPayloadTypes[i].clock_rate; 87 return 0; 88 } 89 } 90 return -1; 91} 92 93int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecContext *codec) 94{ 95 int i; 96 AVOutputFormat *ofmt = fmt ? fmt->oformat : NULL; 97 98 /* Was the payload type already specified for the RTP muxer? */ 99 if (ofmt && ofmt->priv_class) { 100 int64_t payload_type; 101 if (av_opt_get_int(fmt->priv_data, "payload_type", 0, &payload_type) >= 0 && 102 payload_type >= 0) 103 return (int)payload_type; 104 } 105 106 /* static payload type */ 107 for (i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i) 108 if (AVRtpPayloadTypes[i].codec_id == codec->codec_id) { 109 if (codec->codec_id == CODEC_ID_H263) 110 continue; 111 if (codec->codec_id == CODEC_ID_PCM_S16BE) 112 if (codec->channels != AVRtpPayloadTypes[i].audio_channels) 113 continue; 114 return AVRtpPayloadTypes[i].pt; 115 } 116 117 /* dynamic payload type */ 118 return RTP_PT_PRIVATE + (codec->codec_type == AVMEDIA_TYPE_AUDIO); 119} 120 121const char *ff_rtp_enc_name(int payload_type) 122{ 123 int i; 124 125 for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++) 126 if (AVRtpPayloadTypes[i].pt == payload_type) { 127 return AVRtpPayloadTypes[i].enc_name; 128 } 129 130 return ""; 131} 132 133enum CodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type) 134{ 135 int i; 136 137 for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++) 138 if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec_type == AVRtpPayloadTypes[i].codec_type)){ 139 return AVRtpPayloadTypes[i].codec_id; 140 } 141 142 return CODEC_ID_NONE; 143} 144