HeadCountAlgo/links/common/include/Rtp.h

// 
// Copyright @ 2014 Hangzhou Topzen Ltd.
// Author: Tang (tang@hztopzen.com) @ 2014-12
//

#ifndef  __RTP_H
#define  __RTP_H

#include "BaseTypes.h"
#include "BytesOrder.h"

namespace tzc {

// Notice: in network bytes-order
struct RTPHead {

	RTPHead(const TZ_BYTE * net)
	{
		Attribute = net[0];
		TypeInfo = net[1];
		
		memcpy(&Sequence, net + 2, sizeof(Sequence));
		memcpy(&Timestamp, net + 4, sizeof(Timestamp));
		memcpy(&SSRC, net + 8, sizeof(SSRC));

		Sequence = ntoh_16(Sequence);
		Timestamp = ntoh_32(Timestamp);
		SSRC = ntoh_32(SSRC);
	}

	TZ_Uint8 IsMarked();

	TZ_Uint8 PayloadType();

	/* Attribute:
	  0   1   2   3   4   5   6   7
	|--- --- --- --- --- --- --- ---|
	| V |  Pad  | E |  CSRC count   |
	*/
	TZ_Uint8 Attribute;

	/* TypeInfo:
	  0   1   2   3   4   5   6   7
	|--- --- --- --- --- --- --- ---|
	| M |       Payload Type        |
	*/
	TZ_Uint8 TypeInfo;
	
	TZ_Uint16 Sequence;
	
	TZ_Uint32 Timestamp;
	
	TZ_Uint32 SSRC;
};

//
// inlines
//
inline TZ_Uint8 RTPHead::IsMarked()
{
	return (this->TypeInfo & 0x80) != 0;
}

inline TZ_Uint8 RTPHead::PayloadType()
{
	return this->TypeInfo & 0x7F;
}

}	// namespace tzc

#endif   /* ----- #ifndef __RTP_H  ----- */