mirror of https://git.ffmpeg.org/ffmpeg.git
116 lines
3.9 KiB
C
116 lines
3.9 KiB
C
/*
|
|
* RTP definitions
|
|
* Copyright (c) 2002 Fabrice Bellard
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#ifndef AVFORMAT_RTP_H
|
|
#define AVFORMAT_RTP_H
|
|
|
|
#include "libavformat/avformat.h"
|
|
#include "libavcodec/avcodec.h"
|
|
#include "libavutil/mathematics.h"
|
|
|
|
/**
|
|
* Return the payload type for a given stream used in the given format context.
|
|
* Static payload types are derived from the codec.
|
|
* Dynamic payload type are derived from the id field in AVStream.
|
|
* The format context private option payload_type overrides both.
|
|
*
|
|
* @param fmt The context of the format
|
|
* @param codec The context of the codec
|
|
* @param idx The stream index
|
|
* @return The payload type (the 'PT' field in the RTP header).
|
|
*/
|
|
int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecContext *codec,
|
|
int idx);
|
|
|
|
/**
|
|
* Initialize a codec context based on the payload type.
|
|
*
|
|
* Fill the codec_type and codec_id fields of a codec context with
|
|
* information depending on the payload type; for audio codecs, the
|
|
* channels and sample_rate fields are also filled.
|
|
*
|
|
* @param codec The context of the codec
|
|
* @param payload_type The payload type (the 'PT' field in the RTP header)
|
|
* @return In case of unknown payload type or dynamic payload type, a
|
|
* negative value is returned; otherwise, 0 is returned
|
|
*/
|
|
int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type);
|
|
|
|
/**
|
|
* Return the encoding name (as defined in
|
|
* http://www.iana.org/assignments/rtp-parameters) for a given payload type.
|
|
*
|
|
* @param payload_type The payload type (the 'PT' field in the RTP header)
|
|
* @return In case of unknown payload type or dynamic payload type, a pointer
|
|
* to an empty string is returned; otherwise, a pointer to a string containing
|
|
* the encoding name is returned
|
|
*/
|
|
const char *ff_rtp_enc_name(int payload_type);
|
|
|
|
/**
|
|
* Return the codec id for the given encoding name and codec type.
|
|
*
|
|
* @param buf A pointer to the string containing the encoding name
|
|
* @param codec_type The codec type
|
|
* @return In case of unknown encoding name, AV_CODEC_ID_NONE is returned;
|
|
* otherwise, the codec id is returned
|
|
*/
|
|
enum AVCodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type);
|
|
|
|
#define RTP_PT_PRIVATE 96
|
|
#define RTP_VERSION 2
|
|
#define RTP_MAX_SDES 256 /**< maximum text length for SDES */
|
|
|
|
/* RTCP packets use 0.5% of the bandwidth */
|
|
#define RTCP_TX_RATIO_NUM 5
|
|
#define RTCP_TX_RATIO_DEN 1000
|
|
|
|
/* An arbitrary id value for RTP Xiph streams - only relevant to indicate
|
|
* that the configuration has changed within a stream (by changing the
|
|
* ident value sent).
|
|
*/
|
|
#define RTP_XIPH_IDENT 0xfecdba
|
|
|
|
/* RTCP packet types */
|
|
enum RTCPType {
|
|
RTCP_FIR = 192,
|
|
RTCP_NACK, // 193
|
|
RTCP_SMPTETC,// 194
|
|
RTCP_IJ, // 195
|
|
RTCP_SR = 200,
|
|
RTCP_RR, // 201
|
|
RTCP_SDES, // 202
|
|
RTCP_BYE, // 203
|
|
RTCP_APP, // 204
|
|
RTCP_RTPFB,// 205
|
|
RTCP_PSFB, // 206
|
|
RTCP_XR, // 207
|
|
RTCP_AVB, // 208
|
|
RTCP_RSI, // 209
|
|
RTCP_TOKEN,// 210
|
|
};
|
|
|
|
#define RTP_PT_IS_RTCP(x) (((x) >= RTCP_FIR && (x) <= RTCP_IJ) || \
|
|
((x) >= RTCP_SR && (x) <= RTCP_TOKEN))
|
|
|
|
#define NTP_TO_RTP_FORMAT(x) av_rescale((x), INT64_C(1) << 32, 1000000)
|
|
|
|
#endif /* AVFORMAT_RTP_H */
|