3 * Copyright (c) 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
21 #ifndef AVFORMAT_RTP_H
22 #define AVFORMAT_RTP_H
24 #include "libavformat/avformat.h"
25 #include "libavcodec/avcodec.h"
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.
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).
38 int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecContext *codec,
42 * Initialize a codec context based on the payload type.
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.
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
53 int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type);
56 * Return the encoding name (as defined in
57 * http://www.iana.org/assignments/rtp-parameters) for a given payload type.
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
64 const char *ff_rtp_enc_name(int payload_type);
67 * Return the codec id for the given encoding name and codec type.
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
74 enum AVCodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type);
76 #define RTP_PT_PRIVATE 96
78 #define RTP_MAX_SDES 256 /**< maximum text length for SDES */
80 /* RTCP packets use 0.5% of the bandwidth */
81 #define RTCP_TX_RATIO_NUM 5
82 #define RTCP_TX_RATIO_DEN 1000
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
88 #define RTP_XIPH_IDENT 0xfecdba
90 /* RTCP packet types */
109 #define RTP_PT_IS_RTCP(x) (((x) >= RTCP_FIR && (x) <= RTCP_IJ) || \
110 ((x) >= RTCP_SR && (x) <= RTCP_TOKEN))
112 #endif /* AVFORMAT_RTP_H */