rtcpapppacket.h

最新的jrtplib

/*

  This file is a part of JRTPLIB
  Copyright (c) 1999-2007 Jori Liesenborgs

  Contact: [e-mail]

  This library was developed at the "Expertisecentrum Digitale Media"
  (http://www.edm.uhasselt.be), a research center of the Hasselt University
  (http://www.uhasselt.be). The library is based upon work done for 
  my thesis at the School for Knowledge Technology (Belgium/The Netherlands).

  Permission is hereby granted, free of charge, to any person obtaining a
  copy of this software and associated documentation files (the "Software"),
  to deal in the Software without restriction, including without limitation
  the rights to use, copy, modify, merge, publish, distribute, sublicense,
  and/or sell copies of the Software, and to permit persons to whom the
  Software is furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included
  in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  IN THE SOFTWARE.

*/

/**
 * \file rtcpapppacket.h
 */

#ifndef RTCPAPPPACKET_H

#define RTCPAPPPACKET_H

#include "rtpconfig.h"
#include "rtcppacket.h"
#include "rtpstructs.h"
#if ! (defined(WIN32) || defined(_WIN32_WCE))
	#include <netinet/in.h>
#endif // WIN32 

class RTCPCompoundPacket;

/** Describes an RTCP APP packet. */
class RTCPAPPPacket : public RTCPPacket
{
public:
	/** Creates an instance based on the data in \c data with length \c datalen. 
	 *  Creates an instance based on the data in \c data with length \c datalen. Since the \c data pointer
	 *  is referenced inside the class (no copy of the data is made) one must make sure that the memory it 
	 *  points to is valid as long as the class instance exists.
	 */
	RTCPAPPPacket(uint8_t *data,size_t datalen);
	~RTCPAPPPacket()							{ }

	/** Returns the subtype contained in the APP packet. */
	uint8_t GetSubType() const;

	/** Returns the SSRC of the source which sent this packet. */
	uint32_t GetSSRC() const;

	/** Returns the name contained in the APP packet.
	 *  Returns the name contained in the APP packet. This alway consists of four bytes and is not NULL-terminated.
	 */
	uint8_t *GetName(); 

	/** Returns a pointer to the actual data. */
	uint8_t *GetAPPData();

	/** Returns the length of the actual data. */
	size_t GetAPPDataLength() const;
#ifdef RTPDEBUG
	void Dump();
#endif // RTPDEBUG	
private:
	size_t appdatalen;
};

inline uint8_t RTCPAPPPacket::GetSubType() const
{
	if (!knownformat)
		return 0;
	RTCPCommonHeader *hdr = (RTCPCommonHeader *)data;
	return hdr->count;
}

inline uint32_t RTCPAPPPacket::GetSSRC() const
{
	if (!knownformat)
		return 0;

	uint32_t *ssrc = (uint32_t *)(data+sizeof(RTCPCommonHeader));
	return ntohl(*ssrc);	
}

inline uint8_t *RTCPAPPPacket::GetName()
{
	if (!knownformat)
		return 0;

	return (data+sizeof(RTCPCommonHeader)+sizeof(uint32_t));	
}

inline uint8_t *RTCPAPPPacket::GetAPPData()
{
	if (!knownformat)
		return 0;
	if (appdatalen == 0)
		return 0;
	return (data+sizeof(RTCPCommonHeader)+sizeof(uint32_t)*2);
}

inline size_t RTCPAPPPacket::GetAPPDataLength() const
{
	if (!knownformat)
		return 0;
	return appdatalen;
}

#endif // RTCPAPPPACKET_H