rtp: set the payload type as stream id
[libav.git] / libavformat / rtp.h
1 /*
2 * RTP definitions
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 #ifndef AVFORMAT_RTP_H
22 #define AVFORMAT_RTP_H
23
24 #include "libavformat/avformat.h"
25 #include "libavcodec/avcodec.h"
26
27 /**
28 * Return the payload type for a given stream used in the given format context.
29 * Static payload types are derived from the codec.
30 * Dynamic payload type are derived from the id field in AVStream.
31 * The format context private option payload_type overrides both.
32 *
33 * @param fmt The context of the format
34 * @param codec The context of the codec
35 * @param idx The stream index
36 * @return The payload type (the 'PT' field in the RTP header).
37 */
38 int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecContext *codec,
39 int idx);
40
41 /**
42 * Initialize a codec context based on the payload type.
43 *
44 * Fill the codec_type and codec_id fields of a codec context with
45 * information depending on the payload type; for audio codecs, the
46 * channels and sample_rate fields are also filled.
47 *
48 * @param codec The context of the codec
49 * @param payload_type The payload type (the 'PT' field in the RTP header)
50 * @return In case of unknown payload type or dynamic payload type, a
51 * negative value is returned; otherwise, 0 is returned
52 */
53 int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type);
54
55 /**
56 * Return the encoding name (as defined in
57 * http://www.iana.org/assignments/rtp-parameters) for a given payload type.
58 *
59 * @param payload_type The payload type (the 'PT' field in the RTP header)
60 * @return In case of unknown payload type or dynamic payload type, a pointer
61 * to an empty string is returned; otherwise, a pointer to a string containing
62 * the encoding name is returned
63 */
64 const char *ff_rtp_enc_name(int payload_type);
65
66 /**
67 * Return the codec id for the given encoding name and codec type.
68 *
69 * @param buf A pointer to the string containing the encoding name
70 * @param codec_type The codec type
71 * @return In case of unknown encoding name, AV_CODEC_ID_NONE is returned;
72 * otherwise, the codec id is returned
73 */
74 enum AVCodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type);
75
76 #define RTP_PT_PRIVATE 96
77 #define RTP_VERSION 2
78 #define RTP_MAX_SDES 256 /**< maximum text length for SDES */
79
80 /* RTCP packets use 0.5% of the bandwidth */
81 #define RTCP_TX_RATIO_NUM 5
82 #define RTCP_TX_RATIO_DEN 1000
83
84 /* An arbitrary id value for RTP Xiph streams - only relevant to indicate
85 * that the configuration has changed within a stream (by changing the
86 * ident value sent).
87 */
88 #define RTP_XIPH_IDENT 0xfecdba
89
90 /* RTCP packet types */
91 enum RTCPType {
92 RTCP_FIR = 192,
93 RTCP_NACK, // 193
94 RTCP_SMPTETC,// 194
95 RTCP_IJ, // 195
96 RTCP_SR = 200,
97 RTCP_RR, // 201
98 RTCP_SDES, // 202
99 RTCP_BYE, // 203
100 RTCP_APP, // 204
101 RTCP_RTPFB,// 205
102 RTCP_PSFB, // 206
103 RTCP_XR, // 207
104 RTCP_AVB, // 208
105 RTCP_RSI, // 209
106 RTCP_TOKEN,// 210
107 };
108
109 #define RTP_PT_IS_RTCP(x) (((x) >= RTCP_FIR && (x) <= RTCP_IJ) || \
110 ((x) >= RTCP_SR && (x) <= RTCP_TOKEN))
111
112 #endif /* AVFORMAT_RTP_H */