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121 lines
3.4 KiB
121 lines
3.4 KiB
/*****************************************************************************
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* rtp.h: Real-Time Protocol
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*****************************************************************************
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* Copyright (C) 2009 VideoLAN
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* $Id$
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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*
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* This program is free software. It comes without any warranty, to
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* the extent permitted by applicable law. You can redistribute it
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* and/or modify it under the terms of the Do What The Fuck You Want
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* To Public License, Version 2, as published by Sam Hocevar. See
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* http://sam.zoy.org/wtfpl/COPYING for more details.
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*****************************************************************************/
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/*
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* Normative references:
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* - IETF RFC 3550 Real-Time Protocol (July 2003)
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*/
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#ifndef __BITSTREAM_IETF_RTP_H__
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#define __BITSTREAM_IETF_RTP_H__
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#define RTP_HEADER_SIZE 12
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#define RTP_TYPE_TS 33
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/*
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* Reminder : RTP header
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|V=2|P|X| CC |M| PT | sequence number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| timestamp |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| synchronization source (SSRC) identifier |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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| contributing source (CSRC) identifiers |
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| .... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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static inline void rtp_set_hdr(uint8_t *p_rtp)
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{
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p_rtp[0] = 0x80;
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}
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static inline bool rtp_check_hdr(const uint8_t *p_rtp)
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{
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return (p_rtp[0] & 0xc0) == 0x80;
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}
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static inline void rtp_set_type(uint8_t *p_rtp, uint8_t i_type)
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{
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p_rtp[1] = i_type;
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}
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static inline uint8_t rtp_get_type(const uint8_t *p_rtp)
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{
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return p_rtp[1] & 0x7f;
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}
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static inline void rtp_set_seqnum(uint8_t *p_rtp, uint16_t i_seqnum)
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{
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p_rtp[2] = i_seqnum >> 8;
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p_rtp[3] = i_seqnum & 0xff;
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}
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static inline uint16_t rtp_get_seqnum(uint8_t *p_rtp)
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{
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return (p_rtp[2] << 8) | p_rtp[3];
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}
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static inline void rtp_set_timestamp(uint8_t *p_rtp, uint32_t i_timestamp)
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{
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p_rtp[4] = (i_timestamp >> 24) & 0xff;
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p_rtp[5] = (i_timestamp >> 16) & 0xff;
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p_rtp[6] = (i_timestamp >> 8) & 0xff;
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p_rtp[7] = i_timestamp & 0xff;
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}
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static inline uint32_t rtp_get_timestamp(uint8_t *p_rtp)
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{
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return (p_rtp[4] << 24) | (p_rtp[5] << 16) | (p_rtp[6] << 8) | p_rtp[7];
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}
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static inline void rtp_set_ssrc(uint8_t *p_rtp, const uint8_t pi_ssrc[4])
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{
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p_rtp[8] = pi_ssrc[0];
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p_rtp[9] = pi_ssrc[1];
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p_rtp[10] = pi_ssrc[2];
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p_rtp[11] = pi_ssrc[3];
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}
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static inline void rtp_get_ssrc(uint8_t *p_rtp, uint8_t pi_ssrc[4])
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{
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pi_ssrc[0] = p_rtp[8];
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pi_ssrc[1] = p_rtp[9];
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pi_ssrc[2] = p_rtp[10];
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pi_ssrc[3] = p_rtp[11];
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}
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static inline uint8_t *rtp_payload(uint8_t *p_rtp)
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{
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unsigned int i_size = RTP_HEADER_SIZE;
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i_size += 4 * (p_rtp[0] & 0xf);
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if (p_rtp[0] & 0x10) /* header extension */
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i_size += 4 * (1 + (p_rtp[i_size + 2] << 8) + p_rtp[i_size + 3]);
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return p_rtp + i_size;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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