jni/ccrtp-1.8.0-android/src/ccrtp/rtp.h

// Copyright (C) 1999-2005 Open Source Telecom Corporation.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// This exception applies only to the code released under the name GNU
// ccRTP.  If you copy code from other releases into a copy of GNU
// ccRTP, as the General Public License permits, the exception does
// not apply to the code that you add in this way.  To avoid misleading
// anyone as to the status of such modified files, you must delete
// this exception notice from them.
//
// If you write modifications of your own for GNU ccRTP, it is your choice
// whether to permit this exception to apply to your modifications.
// If you do not wish that, delete this exception notice.
//

/**
 * @file rtp.h
 *
 * @short Generic and audio/video profile specific RTP interface of
 * ccRTP.
 *
 * The classes and types in this header provide general RTP
 * functionality (following RFC 3550) as well as audio/video RTP
 * profile specific functionality (following RFC 3551).
 **/

#ifndef	CCXX_RTP_RTP_H_
#define CCXX_RTP_RTP_H_

#include <ccrtp/cqueue.h>
#include <ccrtp/channel.h>

#ifdef	CCXX_NAMESPACES
namespace ost {
#endif

/**
 * @defgroup sessions RTP sessions.
 * @{
 **/

/**
 * @class RTPSessionBase
 *
 * Generic RTP protocol stack for exchange of realtime data.  This
 * stack uses the concept of packet send and receive queues to schedule
 * and buffer outgoing packets and to arrange or reorder incoming packets
 * as they arrive.
 *
 * This is a template class that allows customization of two aspects:
 * the underlying network and the control protocol. The RTPDataChannel
 * and RTCPChannel template parameters specify the socket types to
 * use. The ServiceQueue template parameter specify which packet queue
 * is used.
 *
 * RTPSessionBase objects do not have any threading policy, thus
 * allowing to customize this aspect in derived classes (see
 * SingleThreadRTPSession or RTPSessionPoolBase).
 *
 * @author David Sugar <dyfet@ostel.com>
 * @short RTP protocol stack based on Common C++.
 **/
	template <class RTPDataChannel = DualRTPUDPIPv4Channel,
		  class RTCPChannel = DualRTPUDPIPv4Channel,
		  class ServiceQueue = AVPQueue>
	class __EXPORT TRTPSessionBase : public ServiceQueue
	{
	public:
		/**
		 * Builds a session waiting for packets in a host address.
		 *
		 * @param ia Network address this socket is to be bound.
		 * @param dataPort Transport port the data socket is to be bound.
		 * @param controlPort Transport port the control socket is to be bound.
		 * @param membersSize Initial size of the membership table.
		 * @param app Application this session is associated to.
		 * */
		TRTPSessionBase(const InetHostAddress& ia, tpport_t dataPort,
				tpport_t controlPort, uint32 membersSize,
				RTPApplication& app) :
			ServiceQueue(membersSize,app)
			{ build(ia,dataPort,controlPort); }

		/**
		 * Builds a session with the specified ssrc identifier for the
		 * local source.
		 *
		 * @param ssrc SSRC identifier for the local source.
		 * @param ia Network address this socket is to be bound.
		 * @param dataPort Transport port the data socket is to be bound.
		 * @param controlPort Transport port the control socket is to be bound.
		 * @param membersSize Initial size of the membership table.
		 * @param app Application this session is associated to.
		 **/
		TRTPSessionBase(uint32 ssrc,
				const InetHostAddress& ia,
				tpport_t dataPort, tpport_t controlPort,
				uint32 membersSize, RTPApplication& app):
			ServiceQueue(ssrc,membersSize,app)
			{ build(ia,dataPort,controlPort); }

		/**
		 * Builds a session waiting for packets in a multicast address.
		 * TODO: ssrc constructor for multicast!
		 *
		 * @param ia Multicast address this socket is to be bound.
		 * @param dataPort Transport port the data socket is to be bound.
		 * @param controlPort Transport port the control socket is to be bound.
		 * @param membersSize Initial size of the membership table.
		 * @param app Application this session is associated to.
		 * @param iface Index (from 0 to n) of network interface to join to
		 * multicast group.
		 **/
		TRTPSessionBase(const InetMcastAddress& ia, tpport_t dataPort,
				tpport_t controlPort, uint32 membersSize,
				RTPApplication& app, uint32 iface) :
			ServiceQueue(membersSize,app)
			{ build(ia,dataPort,controlPort,iface); }

		/**
		 * Builds a session waiting for packets in a multicast
		 * address, with the specified ssrc identifier for the local
		 * source.
		 *
		 * @param ssrc SSRC identifier for the local source.
		 * @param ia Multicast address this socket is to be bound.
		 * @param dataPort Transport port the data socket is to be bound.
		 * @param controlPort Transport port the control socket is to be bound.
		 * @param membersSize Initial size of the membership table.
		 * @param app Application this session is associated to.
		 * @param iface Index (from 0 to n) of network interface to join to
		 * multicast group.
		 **/
		TRTPSessionBase(uint32 ssrc,
				const InetMcastAddress& ia, tpport_t dataPort,
				tpport_t controlPort, uint32 membersSize,
				RTPApplication& app, uint32 iface) :
			ServiceQueue(ssrc,membersSize,app)
			{ build(ia,dataPort,controlPort,iface); }

		virtual size_t dispatchBYE(const std::string &str)
			{
				return QueueRTCPManager::dispatchBYE(str);
			}

		/**
		 * Set the value of the TTL field in the sent packets.
		 *
		 * @param ttl Time To Live
		 * @return error code from the socket operation
		 */
		inline Socket::Error
		setMcastTTL(uint8 ttl)
			{
				Socket::Error error = dso->setMulticast(true);
				if ( error ) return error;
				error = dso->setTimeToLive(ttl);
				if ( error ) return error;
				error = cso->setMulticast(true);
				if ( error ) return error;
				return cso->setTimeToLive(ttl);
			}

		inline virtual
		~TRTPSessionBase()
			{
				endSocket();
			}

		inline RTPDataChannel *getDSO(void)
			{return dso;}

	protected:
		/**
		 * @param timeout maximum timeout to wait, in microseconds
		 */
		inline bool
		isPendingData(microtimeout_t timeout)
			{ return dso->isPendingRecv(timeout); }

		InetHostAddress
		getDataSender(tpport_t *port = NULL) const
			{ return dso->getSender(port); }

		inline size_t
		getNextDataPacketSize() const
			{ return dso->getNextPacketSize(); }

		/**
		 * Receive data from the data channel/socket.
		 *
		 * @param buffer Memory region to read to.
		 * @param len Maximum number of octets to get.
		 * @param na Source network address.
		 * @param tp Source transport port.
		 * @return Number of octets actually read.
		 */
		inline size_t
		recvData(unsigned char* buffer, size_t len,
			 InetHostAddress& na, tpport_t& tp)
			{ na = dso->getSender(tp); return dso->recv(buffer, len); }

		inline void
		setDataPeer(const InetAddress &host, tpport_t port)
			{ dso->setPeer(host,port); }


		/**
		 * @param buffer memory region to write from
		 * @param len number of octets to write
		 */
		inline size_t
		sendData(const unsigned char* const buffer, size_t len)
			{ return dso->send(buffer, len); }

		inline SOCKET getDataRecvSocket() const
			{ return dso->getRecvSocket(); }

		/**
		 * @param timeout maximum timeout to wait, in microseconds
		 * @return whether there are packets waiting to be picked
		 */
		inline bool
		isPendingControl(microtimeout_t timeout)
			{ return cso->isPendingRecv(timeout); }

		InetHostAddress
		getControlSender(tpport_t *port = NULL) const
			{ return cso->getSender(port); }

		/**
		 * Receive data from the control channel/socket.
		 *
		 * @param buffer Buffer where to get data.
		 * @param len Maximum number of octets to get.
		 * @param na Source network address.
		 * @param tp Source transport port.
		 * @return Number of octets actually read.
		 **/
		inline size_t
		recvControl(unsigned char *buffer, size_t len,
			    InetHostAddress& na, tpport_t& tp)
			{ na = cso->getSender(tp); return cso->recv(buffer,len); }

		inline void
		setControlPeer(const InetAddress &host, tpport_t port)
			{ cso->setPeer(host,port); }

		/**
		 * @return number of octets actually written
		 * @param buffer
		 * @param len
		 */
		inline size_t
		sendControl(const unsigned char* const buffer, size_t len)
			{ return cso->send(buffer,len); }

		inline SOCKET getControlRecvSocket() const
			{ return cso->getRecvSocket(); }

		/**
		 * Join a multicast group.
		 *
		 * @param ia address of the multicast group
		 * @return error code from the socket operation
		 */
		inline Socket::Error
		joinGroup(const InetMcastAddress& ia, uint32 iface)
			{
				Socket::Error error  = dso->setMulticast(true);
				if ( error ) return error;
				error = dso->join(ia,iface);
				if ( error ) return error;
				error = cso->setMulticast(true);
				if ( error ) {
					dso->drop(ia);
					return error;
				}
				error = cso->join(ia,iface);
				if ( error ) {
					dso->drop(ia);
					return error;
				}
				return Socket::errSuccess;
			}

		/**
		 * Leave a multicast group.
		 *
		 * @param ia address of the multicast group
		 * @return error code from the socket operation
		 */
		inline Socket::Error
		leaveGroup(const InetMcastAddress& ia)
			{
				Socket::Error error = dso->setMulticast(false);
				if ( error ) return error;
				error = dso->leaveGroup(ia);
				if ( error ) return error;
				error = cso->setMulticast(false);
				if ( error ) return error;
				return cso->leaveGroup(ia);
			}

		inline void
		endSocket()
			{
				if (dso) {
					dso->endSocket();
					delete dso;
				}
				dso = NULL;
				if (cso) {
					cso->endSocket();
					delete cso;
				}
				cso = NULL;
			}

	private:
		void
		build(const InetHostAddress& ia, tpport_t dataPort,
		      tpport_t controlPort)
			{
				if ( 0 == controlPort ) {
					dataBasePort = even_port(dataPort);
					controlBasePort = dataBasePort + 1;
				} else {
					dataBasePort = dataPort;
					controlBasePort = controlPort;
				}
				dso = new RTPDataChannel(ia,dataBasePort);
				cso = new RTCPChannel(ia,controlBasePort);
			}

		void
		build(const InetMcastAddress& ia, tpport_t dataPort,
		      tpport_t controlPort, uint32 iface)
			{
				if ( 0 == controlPort ) {
					dataBasePort = even_port(dataPort);
					controlBasePort = dataBasePort + 1;
				} else {
					dataBasePort = dataPort;
					controlBasePort = controlPort;
				}
				dso = new RTPDataChannel(InetHostAddress("0.0.0.0"),dataBasePort);
				cso = new RTCPChannel(InetHostAddress("0.0.0.0"),controlBasePort);
				joinGroup(ia,iface);
			}

		/**
		 * Ensure a port number is odd. If it is an even number, return
		 * the next lower (odd) port number.
		 *
		 * @param port number to filter
		 * @return filtered (odd) port number
		 */
		inline tpport_t
		odd_port(tpport_t port)
			{ return (port & 0x01)? (port) : (port - 1); }

		/**
		 * Ensure a port number is even. If it is an odd number, return
		 * the next lower (even) port number.
		 *
		 * @param port number to filter
		 * @return filtered (even) port number
		 */
		inline tpport_t
		even_port(tpport_t port)
			{ return (port & 0x01)? (port - 1) : (port); }

		tpport_t dataBasePort;
		tpport_t controlBasePort;

	protected:
		RTPDataChannel* dso;
		RTCPChannel* cso;
		friend class RTPSessionBaseHandler;
	};

/**
 * @class SingleThreadRTPSession
 *
 * This template class adds the threading aspect to the RTPSessionBase
 * template in one of the many possible ways. It inherits from a
 * single execution thread that schedules sending of outgoing packets
 * and receipt of incoming packets.
 *
 * @author Federico Montesino Pouzols <fedemp@altern.org>
 **/
	template
	<class RTPDataChannel = DualRTPUDPIPv4Channel,
	 class RTCPChannel = DualRTPUDPIPv4Channel,
	 class ServiceQueue = AVPQueue>
	class __EXPORT SingleThreadRTPSession :
		protected Thread,
		public TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>
	{
	public:
		SingleThreadRTPSession(const InetHostAddress& ia,
				       tpport_t dataPort = DefaultRTPDataPort,
				       tpport_t controlPort = 0,
				       int pri = 0,
				       uint32 memberssize =
				       MembershipBookkeeping::defaultMembersHashSize,
				       RTPApplication& app = defaultApplication()
#if defined(_MSC_VER) && _MSC_VER >= 1300
			);
#else
		):
		Thread(pri),
		TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>
		(ia,dataPort,controlPort,memberssize,app)
		{ }
#endif

        SingleThreadRTPSession(uint32 ssrc, const InetHostAddress& ia,
                               tpport_t dataPort = DefaultRTPDataPort,
                               tpport_t controlPort = 0,
                               int pri = 0,
                               uint32 memberssize =
                               MembershipBookkeeping::defaultMembersHashSize,
                               RTPApplication& app = defaultApplication()
#if defined(_MSC_VER) && _MSC_VER >= 1300
		);
#else
	):
	Thread(pri),
	TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>
	(ssrc, ia,dataPort,controlPort,memberssize,app)
{ }
#endif

SingleThreadRTPSession(const InetMcastAddress& ia,
		       tpport_t dataPort = DefaultRTPDataPort,
		       tpport_t controlPort = 0,
		       int pri = 0,
		       uint32 memberssize =
		       MembershipBookkeeping::defaultMembersHashSize,
		       RTPApplication& app = defaultApplication(),
		       uint32 iface = 0
#if defined(_MSC_VER) && _MSC_VER >= 1300
	       );
#else
        ):
        Thread(pri),
        TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>
        (ia,dataPort,controlPort,memberssize,app,iface)
        { }
#endif

SingleThreadRTPSession(uint32 ssrc, const InetMcastAddress& ia,
		       tpport_t dataPort = DefaultRTPDataPort,
		       tpport_t controlPort = 0,
		       int pri = 0,
		       uint32 memberssize =
		       MembershipBookkeeping::defaultMembersHashSize,
		       RTPApplication& app = defaultApplication(),
		       uint32 iface = 0
#if defined(_MSC_VER) && _MSC_VER >= 1300
                      );
#else
                ):
                Thread(pri),
                TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>
                (ssrc,ia,dataPort,controlPort,memberssize,app,iface)
{ }
#endif


~SingleThreadRTPSession()
{
    if (isRunning()) {
        disableStack(); Thread::join();
    }
}

#if defined(_MSC_VER) && _MSC_VER >= 1300
virtual void startRunning();
#else
/**
 * Activate stack and start service thread.
 **/
void
startRunning()
{ enableStack(); Thread::start(); }
#endif


protected:
inline void disableStack(void)
{TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::disableStack();}

inline void enableStack(void)
{TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::enableStack();}

inline microtimeout_t getSchedulingTimeout(void)
{return TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::getSchedulingTimeout();}

inline void controlReceptionService(void)
{TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::controlReceptionService();}

inline void controlTransmissionService(void)
{TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::controlTransmissionService();}

inline timeval getRTCPCheckInterval(void)
{return TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::getRTCPCheckInterval();}

inline size_t dispatchDataPacket(void)
{return TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::dispatchDataPacket();}

#if defined(_MSC_VER) && _MSC_VER >= 1300
virtual void run(void);

virtual void timerTick(void);

virtual bool isPendingData(microtimeout_t timeout);
#else

virtual void timerTick(void)
{return;}

virtual bool isPendingData(microtimeout_t timeout)
{return TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::isPendingData(timeout);}

/**
 * Single runnable method for this RTP stacks, schedules
 * outgoing and incoming RTP data and RTCP packets.
 **/
virtual void run(void)
{
	microtimeout_t timeout = 0;
	while ( ServiceQueue::isActive() ) {
		if ( timeout < 1000 ){ // !(timeout/1000)
			timeout = getSchedulingTimeout();
		}
		setCancel(cancelDeferred);
		controlReceptionService();
		controlTransmissionService();
		setCancel(cancelImmediate);
		microtimeout_t maxWait =
			timeval2microtimeout(getRTCPCheckInterval());
		// make sure the scheduling timeout is
		// <= the check interval for RTCP
		// packets
		timeout = (timeout > maxWait)? maxWait : timeout;
		if ( timeout < 1000 ) { // !(timeout/1000)
			setCancel(cancelDeferred);
			dispatchDataPacket();
			setCancel(cancelImmediate);
			timerTick();
		} else {
			if ( isPendingData(timeout/1000) ) {
				setCancel(cancelDeferred);
                                if (ServiceQueue::isActive()) { // take in only if active
                                    takeInDataPacket();
                                }
				setCancel(cancelImmediate);
			}
			timeout = 0;
		}
	}
	dispatchBYE("GNU ccRTP stack finishing.");
//        Thread::exit();
}

#endif

inline size_t takeInDataPacket(void)
{return TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::takeInDataPacket();}

inline size_t dispatchBYE(const std::string &str)
{return TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::dispatchBYE(str);}
};

/**
 * @typedef RTPSession
 *
 * Uses two pairs of sockets for RTP data and RTCP
 * transmission/reception.
 *
 * @short UDP/IPv4 RTP Session scheduled by one thread of execution.
 **/
typedef SingleThreadRTPSession<> RTPSession;

/**
 * @typedef RTPSocket
 *
 * Alias for RTPSession.
 **/
typedef RTPSession RTPSocket;

/**
 * @typedef SymmetricRTPSession
 *
 * Uses one pair of sockets, (1) for RTP data and (2) for RTCP
 * transmission/reception.
 *
 * @short Symmetric UDP/IPv4 RTP session scheduled by one thread of execution.
 **/
typedef SingleThreadRTPSession<SymmetricRTPChannel,
			       SymmetricRTPChannel> SymmetricRTPSession;

#ifdef	CCXX_IPV6

/**
 * @class RTPSessionBaseIPV6
 *
 * Generic RTP protocol stack for exchange of realtime data.  This
 * stack uses the concept of packet send and receive queues to schedule
 * and buffer outgoing packets and to arrange or reorder incoming packets
 * as they arrive.
 *
 * This is a template class that allows customization of two aspects:
 * the underlying network and the control protocol. The RTPDataChannel
 * and RTCPChannel template parameters specify the socket types to
 * use. The ServiceQueue template parameter specify which packet queue
 * is used.
 *
 * RTPSessionBase objects do not have any threading policy, thus
 * allowing to customize this aspect in derived classes (see
 * SingleThreadRTPSession or RTPSessionPoolBase).
 *
 * @author David Sugar <dyfet@ostel.com>
 * @short RTP protocol stack based on Common C++.
 **/
template <class RTPDataChannel = DualRTPUDPIPv6Channel,
	  class RTCPChannel = DualRTPUDPIPv6Channel,
	  class ServiceQueue = AVPQueue>
class __EXPORT TRTPSessionBaseIPV6 : public ServiceQueue
{
public:
/**
 * Builds a session waiting for packets in a host address.
 *
 * @param ia Network address this socket is to be bound.
 * @param dataPort Transport port the data socket is to be bound.
 * @param controlPort Transport port the control socket is to be bound.
 * @param membersSize Initial size of the membership table.
 * @param app Application this session is associated to.
 * */
TRTPSessionBaseIPV6(const IPV6Host& ia, tpport_t dataPort,
	tpport_t controlPort, uint32 membersSize,
	RTPApplication& app) :
	ServiceQueue(membersSize,app)
{ build(ia,dataPort,controlPort); }

	/**
	 * Builds a session with the specified ssrc identifier for the
	 * local source.
	 *
	 * @param ssrc SSRC identifier for the local source.
	 * @param ia Network address this socket is to be bound.
	 * @param dataPort Transport port the data socket is to be bound.
	 * @param controlPort Transport port the control socket is to be bound.
	 * @param membersSize Initial size of the membership table.
	 * @param app Application this session is associated to.
	 **/
	TRTPSessionBaseIPV6(uint32 ssrc,
			    const IPV6Host& ia,
			    tpport_t dataPort, tpport_t controlPort,
			    uint32 membersSize, RTPApplication& app):
		ServiceQueue(ssrc,membersSize,app)
		{ build(ia,dataPort,controlPort); }

	/**
	 * Builds a session waiting for packets in a multicast address.
	 * TODO: ssrc constructor for multicast!
	 *
	 * @param ia Multicast address this socket is to be bound.
	 * @param dataPort Transport port the data socket is to be bound.
	 * @param controlPort Transport port the control socket is to be bound.
	 * @param membersSize Initial size of the membership table.
	 * @param app Application this session is associated to.
	 * @param iface Index (from 0 to n) of network interface to join to
	 * multicast group.
	 **/
	TRTPSessionBaseIPV6(const IPV6Multicast& ia, tpport_t dataPort,
			    tpport_t controlPort, uint32 membersSize,
			    RTPApplication& app, uint32 iface) :
		ServiceQueue(membersSize,app)
		{ build(ia,dataPort,controlPort,iface); }

	/**
	 * Builds a session waiting for packets in a multicast
	 * address, with the specified ssrc identifier for the local
	 * source.
	 *
	 * @param ssrc SSRC identifier for the local source.
	 * @param ia Multicast address this socket is to be bound.
	 * @param dataPort Transport port the data socket is to be bound.
	 * @param controlPort Transport port the control socket is to be bound.
	 * @param membersSize Initial size of the membership table.
	 * @param app Application this session is associated to.
	 * @param iface Index (from 0 to n) of network interface to join to
	 * multicast group.
	 **/
	TRTPSessionBaseIPV6(uint32 ssrc,
			    const IPV6Multicast& ia, tpport_t dataPort,
			    tpport_t controlPort, uint32 membersSize,
			    RTPApplication& app, uint32 iface) :
		ServiceQueue(ssrc,membersSize,app)
		{ build(ia,dataPort,controlPort,iface); }

	virtual size_t dispatchBYE(const std::string &str)
		{
			return QueueRTCPManager::dispatchBYE(str);
		}

	inline virtual
	~TRTPSessionBaseIPV6()
		{
			endSocket();
		}

	inline RTPDataChannel *getDSO(void)
		{return dso;}

protected:
	/**
	 * @param timeout maximum timeout to wait, in microseconds
	 */
	inline bool
	isPendingData(microtimeout_t timeout)
		{ return dso->isPendingRecv(timeout); }

	inline IPV6Host
	getDataSender(tpport_t *port = NULL) const
		{ return dso->getSender(port); }

	inline size_t
	getNextDataPacketSize() const
		{ return dso->getNextPacketSize(); }

	/**
	 * Receive data from the data channel/socket.
	 *
	 * @param buffer Memory region to read to.
	 * @param len Maximum number of octets to get.
	 * @param na Source network address.
	 * @param tp Source transport port.
	 * @return Number of octets actually read.
	 */
	inline size_t
	recvData(unsigned char* buffer, size_t len,
		 IPV6Host& na, tpport_t& tp)
		{ na = dso->getSender(tp); return dso->recv(buffer, len); }

        inline void
        setDataPeerIPV6(const IPV6Host &host, tpport_t port)
		{ dso->setPeer(host,port); }

	/**
	 * @param buffer memory region to write from
	 * @param len number of octets to write
	 */
	inline size_t
	sendDataIPV6(const unsigned char* const buffer, size_t len)
		{ return dso->send(buffer, len); }

	inline SOCKET getDataRecvSocket() const
		{ return dso->getRecvSocket(); }

	/**
	 * @param timeout maximum timeout to wait, in microseconds
	 * @return whether there are packets waiting to be picked
	 */
        inline bool
	isPendingControl(microtimeout_t timeout)
		{ return cso->isPendingRecv(timeout); }

	inline IPV6Host
	getControlSender(tpport_t *port = NULL) const
		{ return cso->getSender(port); }

	/**
	 * Receive data from the control channel/socket.
	 *
	 * @param buffer Buffer where to get data.
	 * @param len Maximum number of octets to get.
	 * @param na Source network address.
	 * @param tp Source transport port.
	 * @return Number of octets actually read.
	 **/
        inline size_t
	recvControl(unsigned char *buffer, size_t len,
		    IPV6Host& na, tpport_t& tp)
		{ na = cso->getSender(tp); return cso->recv(buffer,len); }

        inline void
        setControlPeerIPV6(const IPV6Host &host, tpport_t port)
		{ cso->setPeer(host,port); }

	/**
	 * @return number of octets actually written
	 * @param buffer
	 * @param len
	 */
        inline size_t
	sendControl(const unsigned char* const buffer, size_t len)
		{ return cso->send(buffer,len); }

	inline SOCKET getControlRecvSocket() const
		{ return cso->getRecvSocket(); }

	inline void
	endSocket()
		{
			dso->endSocket();
			cso->endSocket();
			if (dso) delete dso;
			dso = NULL;
			if (cso) delete cso;
			cso = NULL;
		}

private:
	void
	build(const IPV6Host& ia, tpport_t dataPort,
	      tpport_t controlPort)
		{
			if ( 0 == controlPort ) {
				dataBasePort = even_port(dataPort);
				controlBasePort = dataBasePort + 1;
			} else {
				dataBasePort = dataPort;
				controlBasePort = controlPort;
			}
			dso = new RTPDataChannel(ia,dataBasePort);
			cso = new RTCPChannel(ia,controlBasePort);
		}

	void
	build(const IPV6Multicast& ia, tpport_t dataPort,
	      tpport_t controlPort, uint32 iface)
		{
			if ( 0 == controlPort ) {
				dataBasePort = even_port(dataPort);
				controlBasePort = dataBasePort + 1;
			} else {
				dataBasePort = dataPort;
				controlBasePort = controlPort;
			}
			dso = new RTPDataChannel(IPV6Host("0.0.0.0"),dataBasePort);
			cso = new RTCPChannel(IPV6Host("0.0.0.0"),controlBasePort);
			joinGroup(ia,iface);
		}

	/**
	 * Join a multicast group.
	 *
	 * @param ia address of the multicast group
	 * @return error code from the socket operation
	 */
	inline Socket::Error
	joinGroup(const IPV6Multicast& ia, uint32 iface)
		{
			Socket::Error error  = dso->setMulticast(true);
			if ( error ) return error;
			error = dso->join(ia,iface);
			if ( error ) return error;
			error = cso->setMulticast(true);
			if ( error ) {
				dso->drop(ia);
				return error;
			}
			error = cso->join(ia,iface);
			if ( error ) {
				dso->drop(ia);
				return error;
			}
			return Socket::errSuccess;
		}

	/**
	 * Leave a multicast group.
	 *
	 * @param ia address of the multicast group
	 * @return error code from the socket operation
	 */
	inline Socket::Error
	leaveGroup(const IPV6Multicast& ia)
		{
			Socket::Error error = dso->setMulticast(false);
			if ( error ) return error;
			error = dso->leaveGroup(ia);
			if ( error ) return error;
			error = cso->setMulticast(false);
			if ( error ) return error;
			return cso->leaveGroup(ia);
		}

	/**
	 * Set the value of the TTL field in the sent packets.
	 *
	 * @param ttl Time To Live
	 * @return error code from the socket operation
	 */
	inline Socket::Error
	setMcastTTL(uint8 ttl)
		{
			Socket::Error error = dso->setMulticast(true);
			if ( error ) return error;
			error = dso->setTimeToLive(ttl);
			if ( error ) return error;
			error = cso->setMulticast(true);
			if ( error ) return error;
			return cso->setTimeToLive(ttl);
		}

	/**
	 * Ensure a port number is odd. If it is an even number, return
	 * the next lower (odd) port number.
	 *
	 * @param port number to filter
	 * @return filtered (odd) port number
	 */
	inline tpport_t
	odd_port(tpport_t port)
		{ return (port & 0x01)? (port) : (port - 1); }

	/**
	 * Ensure a port number is even. If it is an odd number, return
	 * the next lower (even) port number.
	 *
	 * @param port number to filter
	 * @return filtered (even) port number
	 */
	inline tpport_t
	even_port(tpport_t port)
		{ return (port & 0x01)? (port - 1) : (port); }

	tpport_t dataBasePort;
	tpport_t controlBasePort;

protected:
	RTPDataChannel* dso;
	RTCPChannel* cso;
	friend class RTPSessionBaseHandler;
};

/**
 * @class SingleThreadRTPSessionIPV6
 *
 * This template class adds the threading aspect to the RTPSessionBase
 * template in one of the many possible ways. It inherits from a
 * single execution thread that schedules sending of outgoing packets
 * and receipt of incoming packets.
 *
 * @author David Sugar <dyfet@gnutelephony.org>
 **/
template
<class RTPDataChannel = DualRTPUDPIPv6Channel,
 class RTCPChannel = DualRTPUDPIPv6Channel,
 class ServiceQueue = AVPQueue>
class __EXPORT SingleThreadRTPSessionIPV6 :
	protected Thread,
	public TRTPSessionBaseIPV6<RTPDataChannel,RTCPChannel,ServiceQueue>
{
public:
	SingleThreadRTPSessionIPV6(const IPV6Host& ia,
				   tpport_t dataPort = DefaultRTPDataPort,
				   tpport_t controlPort = 0,
				   int pri = 0,
				   uint32 memberssize =
				   MembershipBookkeeping::defaultMembersHashSize,
				   RTPApplication& app = defaultApplication()
#if defined(_MSC_VER) && _MSC_VER >= 1300
		);
#else
	):
	Thread(pri),
	TRTPSessionBaseIPV6<RTPDataChannel,RTCPChannel,ServiceQueue>
	(ia,dataPort,controlPort,memberssize,app)
{ }
#endif

SingleThreadRTPSessionIPV6(const IPV6Multicast& ia,
			   tpport_t dataPort = DefaultRTPDataPort,
			   tpport_t controlPort = 0,
			   int pri = 0,
			   uint32 memberssize =
			   MembershipBookkeeping::defaultMembersHashSize,
			   RTPApplication& app = defaultApplication(),
			   uint32 iface = 0
#if defined(_MSC_VER) && _MSC_VER >= 1300
	);
#else
        ):
        Thread(pri),
        TRTPSessionBaseIPV6<RTPDataChannel,RTCPChannel,ServiceQueue>
        (ia,dataPort,controlPort,memberssize,app,iface)
{ }
#endif

~SingleThreadRTPSessionIPV6()
{
    if (isRunning()) {
        disableStack(); Thread::join();
    }
}

#if defined(_MSC_VER) && _MSC_VER >= 1300
virtual void startRunning();
#else
/**
 * Activate stack and start service thread.
 **/
void
startRunning()
{ enableStack(); Thread::start(); }
#endif


protected:
inline void enableStack(void)
{TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::enableStack();}

inline void disableStack(void)
{TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::disableStack();}

inline microtimeout_t getSchedulingTimeout(void)
{return TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::getSchedulingTimeout();}

inline void controlReceptionService(void)
{TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::controlReceptionService();}

inline void controlTransmissionService(void)
{TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::controlTransmissionService();}

inline timeval getRTCPCheckInterval(void)
{return TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::getRTCPCheckInterval();}

inline size_t dispatchDataPacket(void)
{return TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::dispatchDataPacket();}

#if defined(_MSC_VER) && _MSC_VER >= 1300
virtual void run(void);

virtual void timerTick(void);

virtual bool isPendingData(microtimeout_t timeout);
#else

virtual void timerTick(void)
{return;}

virtual bool isPendingData(microtimeout_t timeout)
{return TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::isPendingData(timeout);}

/**
 * Single runnable method for this RTP stacks, schedules
 * outgoing and incoming RTP data and RTCP packets.
 **/
virtual void run(void)
{
	microtimeout_t timeout = 0;
	while ( ServiceQueue::isActive() ) {
		if ( timeout < 1000 ){ // !(timeout/1000)
			timeout = getSchedulingTimeout();
		}
		setCancel(cancelDeferred);
		controlReceptionService();
		controlTransmissionService();
		setCancel(cancelImmediate);
		microtimeout_t maxWait =
			timeval2microtimeout(getRTCPCheckInterval());
		// make sure the scheduling timeout is
		// <= the check interval for RTCP
		// packets
		timeout = (timeout > maxWait)? maxWait : timeout;
		if ( timeout < 1000 ) { // !(timeout/1000)
			setCancel(cancelDeferred);
			dispatchDataPacket();
			setCancel(cancelImmediate);
			timerTick();
		} else {
			if ( isPendingData(timeout/1000) ) {
				setCancel(cancelDeferred);
				takeInDataPacket();
				setCancel(cancelImmediate);
			}
			timeout = 0;
		}
	}
	dispatchBYE("GNU ccRTP stack finishing.");
        Thread::exit();
}

#endif

inline size_t takeInDataPacket(void)
{return TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::takeInDataPacket();}

inline size_t dispatchBYE(const std::string &str)
{return TRTPSessionBase<RTPDataChannel,RTCPChannel,ServiceQueue>::dispatchBYE(str);}
};

/**
 * @typedef RTPSession
 *
 * Uses two pairs of sockets for RTP data and RTCP
 * transmission/reception.
 *
 * @short UDP/IPv6 RTP Session scheduled by one thread of execution.
 **/
typedef SingleThreadRTPSessionIPV6<> RTPSessionIPV6;

/**
 * @typedef RTPSocket
 *
 * Alias for RTPSession.
 **/
typedef RTPSessionIPV6 RTPSocketIPV6;

/**
 * @typedef SymmetricRTPSession
 *
 * Uses one pair of sockets, (1) for RTP data and (2) for RTCP
 * transmission/reception.
 *
 * @short Symmetric UDP/IPv6 RTP session scheduled by one thread of execution.
 **/
 typedef SingleThreadRTPSessionIPV6<SymmetricRTPChannelIPV6,
				    SymmetricRTPChannelIPV6> SymmetricRTPSessionIPV6;


#endif

/** @}*/ // sessions

#ifdef  CCXX_NAMESPACES
}
#endif

#endif  //CCXX_RTP_RTP_H_

/** EMACS **
 * Local variables:
 * mode: c++
 * c-basic-offset: 8
 * End:
 */