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1 | /* |
2 | * RTP definitions | |
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 | #ifndef AVFORMAT_RTP_H | |
22 | #define AVFORMAT_RTP_H | |
23 | ||
24 | #include "libavformat/avformat.h" | |
25 | #include "libavcodec/avcodec.h" | |
26 | #include "libavutil/mathematics.h" | |
27 | ||
28 | /** | |
29 | * Return the payload type for a given stream used in the given format context. | |
30 | * Static payload types are derived from the codec. | |
31 | * Dynamic payload type are derived from the id field in AVStream. | |
32 | * The format context private option payload_type overrides both. | |
33 | * | |
34 | * @param fmt The context of the format | |
35 | * @param codec The context of the codec | |
36 | * @param idx The stream index | |
37 | * @return The payload type (the 'PT' field in the RTP header). | |
38 | */ | |
39 | int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecContext *codec, | |
40 | int idx); | |
41 | ||
42 | /** | |
43 | * Initialize a codec context based on the payload type. | |
44 | * | |
45 | * Fill the codec_type and codec_id fields of a codec context with | |
46 | * information depending on the payload type; for audio codecs, the | |
47 | * channels and sample_rate fields are also filled. | |
48 | * | |
49 | * @param codec The context of the codec | |
50 | * @param payload_type The payload type (the 'PT' field in the RTP header) | |
51 | * @return In case of unknown payload type or dynamic payload type, a | |
52 | * negative value is returned; otherwise, 0 is returned | |
53 | */ | |
54 | int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type); | |
55 | ||
56 | /** | |
57 | * Return the encoding name (as defined in | |
58 | * http://www.iana.org/assignments/rtp-parameters) for a given payload type. | |
59 | * | |
60 | * @param payload_type The payload type (the 'PT' field in the RTP header) | |
61 | * @return In case of unknown payload type or dynamic payload type, a pointer | |
62 | * to an empty string is returned; otherwise, a pointer to a string containing | |
63 | * the encoding name is returned | |
64 | */ | |
65 | const char *ff_rtp_enc_name(int payload_type); | |
66 | ||
67 | /** | |
68 | * Return the codec id for the given encoding name and codec type. | |
69 | * | |
70 | * @param buf A pointer to the string containing the encoding name | |
71 | * @param codec_type The codec type | |
72 | * @return In case of unknown encoding name, AV_CODEC_ID_NONE is returned; | |
73 | * otherwise, the codec id is returned | |
74 | */ | |
75 | enum AVCodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type); | |
76 | ||
77 | #define RTP_PT_PRIVATE 96 | |
78 | #define RTP_VERSION 2 | |
79 | #define RTP_MAX_SDES 256 /**< maximum text length for SDES */ | |
80 | ||
81 | /* RTCP packets use 0.5% of the bandwidth */ | |
82 | #define RTCP_TX_RATIO_NUM 5 | |
83 | #define RTCP_TX_RATIO_DEN 1000 | |
84 | ||
85 | /* An arbitrary id value for RTP Xiph streams - only relevant to indicate | |
86 | * that the configuration has changed within a stream (by changing the | |
87 | * ident value sent). | |
88 | */ | |
89 | #define RTP_XIPH_IDENT 0xfecdba | |
90 | ||
91 | /* RTCP packet types */ | |
92 | enum RTCPType { | |
93 | RTCP_FIR = 192, | |
94 | RTCP_NACK, // 193 | |
95 | RTCP_SMPTETC,// 194 | |
96 | RTCP_IJ, // 195 | |
97 | RTCP_SR = 200, | |
98 | RTCP_RR, // 201 | |
99 | RTCP_SDES, // 202 | |
100 | RTCP_BYE, // 203 | |
101 | RTCP_APP, // 204 | |
102 | RTCP_RTPFB,// 205 | |
103 | RTCP_PSFB, // 206 | |
104 | RTCP_XR, // 207 | |
105 | RTCP_AVB, // 208 | |
106 | RTCP_RSI, // 209 | |
107 | RTCP_TOKEN,// 210 | |
108 | }; | |
109 | ||
110 | #define RTP_PT_IS_RTCP(x) (((x) >= RTCP_FIR && (x) <= RTCP_IJ) || \ | |
111 | ((x) >= RTCP_SR && (x) <= RTCP_TOKEN)) | |
112 | ||
113 | #define NTP_TO_RTP_FORMAT(x) av_rescale((x), INT64_C(1) << 32, 1000000) | |
114 | ||
115 | #endif /* AVFORMAT_RTP_H */ |