rtp: set the payload type as stream id
[libav.git] / libavformat / rtp.c
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 */
35 static const struct
36 {
37 int pt;
38 const char enc_name[6];
39 enum AVMediaType codec_type;
40 enum AVCodecID codec_id;
41 int clock_rate;
42 int audio_channels;
43 } AVRtpPayloadTypes[]=
44 {
45 {0, "PCMU", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_MULAW, 8000, 1},
46 {3, "GSM", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1},
47 {4, "G723", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_G723_1, 8000, 1},
48 {5, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1},
49 {6, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 16000, 1},
50 {7, "LPC", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1},
51 {8, "PCMA", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_ALAW, 8000, 1},
52 {9, "G722", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_ADPCM_G722, 8000, 1},
53 {10, "L16", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_S16BE, 44100, 2},
54 {11, "L16", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_S16BE, 44100, 1},
55 {12, "QCELP", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_QCELP, 8000, 1},
56 {13, "CN", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1},
57 {14, "MPA", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP2, -1, -1},
58 {14, "MPA", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3, -1, -1},
59 {15, "G728", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1},
60 {16, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 11025, 1},
61 {17, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 22050, 1},
62 {18, "G729", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1},
63 {25, "CelB", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_NONE, 90000, -1},
64 {26, "JPEG", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MJPEG, 90000, -1},
65 {28, "nv", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_NONE, 90000, -1},
66 {31, "H261", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H261, 90000, -1},
67 {32, "MPV", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG1VIDEO, 90000, -1},
68 {32, "MPV", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO, 90000, -1},
69 {33, "MP2T", AVMEDIA_TYPE_DATA, AV_CODEC_ID_MPEG2TS, 90000, -1},
70 {34, "H263", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H263, 90000, -1},
71 {-1, "", AVMEDIA_TYPE_UNKNOWN, AV_CODEC_ID_NONE, -1, -1}
72 };
73
74 int 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 != AV_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
93 int ff_rtp_get_payload_type(AVFormatContext *fmt,
94 AVCodecContext *codec, int idx)
95 {
96 int i;
97 AVOutputFormat *ofmt = fmt ? fmt->oformat : NULL;
98
99 /* Was the payload type already specified for the RTP muxer? */
100 if (ofmt && ofmt->priv_class) {
101 int64_t payload_type;
102 if (av_opt_get_int(fmt->priv_data, "payload_type", 0, &payload_type) >= 0 &&
103 payload_type >= 0)
104 return (int)payload_type;
105 }
106
107 /* static payload type */
108 for (i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
109 if (AVRtpPayloadTypes[i].codec_id == codec->codec_id) {
110 if (codec->codec_id == AV_CODEC_ID_H263 && (!fmt ||
111 !fmt->oformat->priv_class ||
112 !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190")))
113 continue;
114 /* G722 has 8000 as nominal rate even if the sample rate is 16000,
115 * see section 4.5.2 in RFC 3551. */
116 if (codec->codec_id == AV_CODEC_ID_ADPCM_G722 &&
117 codec->sample_rate == 16000 && codec->channels == 1)
118 return AVRtpPayloadTypes[i].pt;
119 if (codec->codec_type == AVMEDIA_TYPE_AUDIO &&
120 ((AVRtpPayloadTypes[i].clock_rate > 0 &&
121 codec->sample_rate != AVRtpPayloadTypes[i].clock_rate) ||
122 (AVRtpPayloadTypes[i].audio_channels > 0 &&
123 codec->channels != AVRtpPayloadTypes[i].audio_channels)))
124 continue;
125 return AVRtpPayloadTypes[i].pt;
126 }
127
128 if (idx < 0)
129 idx = codec->codec_type == AVMEDIA_TYPE_AUDIO;
130
131 /* dynamic payload type */
132 return RTP_PT_PRIVATE + idx;
133 }
134
135 const char *ff_rtp_enc_name(int payload_type)
136 {
137 int i;
138
139 for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
140 if (AVRtpPayloadTypes[i].pt == payload_type) {
141 return AVRtpPayloadTypes[i].enc_name;
142 }
143
144 return "";
145 }
146
147 enum AVCodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type)
148 {
149 int i;
150
151 for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
152 if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec_type == AVRtpPayloadTypes[i].codec_type)){
153 return AVRtpPayloadTypes[i].codec_id;
154 }
155
156 return AV_CODEC_ID_NONE;
157 }