0,0 → 1,115 |
/* |
* 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 */ |