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