/*

* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:    Class to hold depayloadized RTP packet information

**				 i.e. depayloadized NAL units with appropriate information

** 			 like timestamp, marker bit etc

**

*/

#ifndef AVCRTPSTRUCT_H

#define AVCRTPSTRUCT_H

#include <e32std.h>

// constants, taken from rfc3984base.h, these are possible values of PT field in the TRTPInfo struct

// NAL packet types

#define	PACKET_NAL_SLICE	1

#define	PACKET_NAL_PARTA	2

#define	PACKET_NAL_PARTB	3

#define	PACKET_NAL_PARTC	4

#define	PACKET_NAL_IDR  	5

#define PACKET_NAL_SEI  	6

#define PACKET_NAL_SPS  	7

#define PACKET_NAL_PPS  	8

#define PACKET_NAL_AUD  	9

#define PACKET_NAL_EOS  	10

#define PACKET_NAL_EOSTR	11

#define PACKET_NAL_FD   	12

#define PACKET_NAL_UNIT 	23

#define PACKET_STAP_A   	24

#define PACKET_STAP_B   	25

#define PACKET_MTAP16   	26

#define PACKET_MTAP24   	27

#define PACKET_FU_A     	28

#define PACKET_FU_B     	29

// AVC information

struct TRTPInfo {

	TInt64 TS;	// this is in microseconds like TTimeIntervalMicroSeconds

	TUint16 SN;

	TUint16 DON;

	TUint16 NRI;

	TUint8	PT;		// packet type for H.264

	TUint8	FUH;	// FU-Header Byte (contains, start, end and reserve bit)

};

// -----------------------------------------------------------------------------

// SeqDiff -- compares two N but sequence numbers.  Returns the distance of 

// the second arguement relative to the first.  E.g. SeqDiff<16>(10, 12) == 2 and

// SeqDiff<16>(12, 10) == -2

//

// N must be <= 32

// -----------------------------------------------------------------------------

//

template < unsigned N >

TInt SeqDiff( TUint aSeqNum1, TUint aSeqNum2 )

{

	struct { TInt s:N; } diff;

	diff.s = aSeqNum2 - aSeqNum1;

	return diff.s;	// force sign extension of a B bit integer to a 32 bit integer

}

#endif 	// AVCRTPSTRUCT_H