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
ff_rtp_get_codec_info(AVCodecParameters * par,int payload_type)71 int ff_rtp_get_codec_info(AVCodecParameters *par, 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 par->codec_type = rtp_payload_types[i].codec_type;
79 par->codec_id = rtp_payload_types[i].codec_id;
80 if (rtp_payload_types[i].audio_channels > 0)
81 par->channels = rtp_payload_types[i].audio_channels;
82 if (rtp_payload_types[i].clock_rate > 0)
83 par->sample_rate = rtp_payload_types[i].clock_rate;
84 return 0;
85 }
86 }
87 return -1;
88 }
89
ff_rtp_get_payload_type(AVFormatContext * fmt,AVCodecParameters * par,int idx)90 int ff_rtp_get_payload_type(AVFormatContext *fmt,
91 AVCodecParameters *par, int idx)
92 {
93 int i;
94 const 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 == par->codec_id) {
107 if (par->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 (par->codec_id == AV_CODEC_ID_ADPCM_G722 &&
114 par->sample_rate == 16000 && par->channels == 1)
115 return rtp_payload_types[i].pt;
116 if (par->codec_type == AVMEDIA_TYPE_AUDIO &&
117 ((rtp_payload_types[i].clock_rate > 0 &&
118 par->sample_rate != rtp_payload_types[i].clock_rate) ||
119 (rtp_payload_types[i].audio_channels > 0 &&
120 par->channels != rtp_payload_types[i].audio_channels)))
121 continue;
122 return rtp_payload_types[i].pt;
123 }
124
125 if (idx < 0)
126 idx = par->codec_type == AVMEDIA_TYPE_AUDIO;
127
128 /* dynamic payload type */
129 return RTP_PT_PRIVATE + idx;
130 }
131
ff_rtp_enc_name(int payload_type)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
ff_rtp_codec_id(const char * buf,enum AVMediaType codec_type)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 }
153