548 lines
15 KiB
C++
548 lines
15 KiB
C++
/**
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* yatertp.h
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* Yet Another RTP Stack
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* This file is part of the YATE Project http://YATE.null.ro
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*
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* Yet Another Telephony Engine - a fully featured software PBX and IVR
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* Copyright (C) 2004, 2005 Null Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __YATERTP_H
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#define __YATERTP_H
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#include <yateclass.h>
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#ifdef _WINDOWS
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#ifdef LIBYRTP_EXPORTS
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#define YRTP_API __declspec(dllexport)
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#else
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#ifndef LIBYRTP_STATIC
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#define YRTP_API __declspec(dllimport)
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#endif
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#endif
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#endif /* _WINDOWS */
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#ifndef YRTP_API
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#define YRTP_API
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#endif
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/**
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* Holds all Telephony Engine related classes.
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*/
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namespace TelEngine {
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/**
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* A base class that contains just placeholders to process raw RTP and RTCP packets.
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* @short Base class to ease creation of RTP forwarders
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*/
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class YRTP_API RTPProcessor : public GenObject
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{
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friend class RTPGroup;
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friend class RTPTransport;
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friend class RTPSession;
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public:
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/**
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* Constructor - inserts itself in a RTP group
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* @param grp RTP group to join
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*/
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RTPProcessor(RTPGroup* grp = 0);
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/**
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* Destructor - removes itself from the RTP group
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*/
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virtual ~RTPProcessor();
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/**
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* Get the RTP group to which this processor belongs
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* @return Pointer to the RTP group this processor has joined
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*/
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inline RTPGroup* group() const
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{ return m_group; }
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/**
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* This method is called to send or process a RTP packet
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* @param data Pointer to raw RTP data
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* @param len Length of the data packet
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*/
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virtual void rtpData(const void* data, int len) = 0;
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/**
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* This method is called to send or process a RTCP packet
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* @param data Pointer to raw RTCP data
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* @param len Length of the data packet
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*/
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virtual void rtcpData(const void* data, int len) = 0;
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protected:
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/**
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* Set a new RTP group for this processor
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* @param newgrp New group to join this processor, the old one will be left
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*/
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void group(RTPGroup* newgrp);
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/**
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* Method called periodically to keep the data flowing
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* @param when Time to use as base in all computing
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*/
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virtual void timerTick(const Time& when) = 0;
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private:
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RTPGroup* m_group;
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};
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/**
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* Several possibly related RTP processors share the same RTP group which
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* holds the thread that keeps them running.
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* @short A group of RTP processors handled by the same thread
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*/
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class YRTP_API RTPGroup : public GenObject, public Mutex, public Thread
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{
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friend class RTPProcessor;
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public:
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/**
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* Constructor
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* @param prio Thread priority to run this group
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*/
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RTPGroup(Priority prio = Normal);
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/**
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* Group destructor, removes itself from all remaining processors
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*/
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virtual ~RTPGroup();
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/**
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* Inherited thread cleanup
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*/
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virtual void cleanup();
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/**
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* Inherited thread run method
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*/
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virtual void run();
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protected:
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/**
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* Add a RTP processor to this group
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* @param processor Pointer to the RTP processor to add
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*/
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void join(RTPProcessor* proc);
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/**
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* Remove a RTP processor from this group
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* @param processor Pointer to the RTP processor to remove
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*/
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void part(RTPProcessor* proc);
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private:
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ObjList m_processors;
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};
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/**
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* Class that holds sockets and addresses for transporting RTP and RTCP packets.
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* @short Low level transport for RTP and RTCP
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*/
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class YRTP_API RTPTransport : public RTPProcessor
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{
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public:
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enum Activation {
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Inactive,
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Bound,
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Active
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};
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/**
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* Constructor, creates a transport optionally joined to a group
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* @param grp RTP group to join
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*/
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RTPTransport(RTPGroup* grp = 0);
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/**
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* Destructor
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*/
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virtual ~RTPTransport();
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/**
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* Set the RTP/RTCP processor of data received by this transport
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* @param processor A pointer to the RTPProcessor for this transport
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*/
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void setProcessor(RTPProcessor* processor = 0);
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/**
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* Set the RTP/RTCP monitor of data received by this transport
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* @param monitor A pointer to a second RTPProcessor for this transport
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*/
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void setMonitor(RTPProcessor* monitor = 0);
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/**
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* Get the local network address of the RTP transport
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* @return Reference to the local RTP transport address
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*/
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inline const SocketAddr& localAddr() const
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{ return m_localAddr; }
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/**
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* Get the remote network address of the RTP transport
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* @return Reference to the remote RTP transport address
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*/
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inline const SocketAddr& remoteAddr() const
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{ return m_remoteAddr; }
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/**
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* Set the local network address of the RTP transport
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* @param addr New local RTP transport address
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* @return True if address set, false if a failure occured
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*/
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bool localAddr(SocketAddr& addr);
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/**
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* Set the remote network address of the RTP transport
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* @param addr New remote RTP transport address
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* @return True if address set, false if a failure occured
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*/
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bool remoteAddr(SocketAddr& addr);
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protected:
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/**
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* Method called periodically to read data out of sockets
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* @param when Time to use as base in all computing
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*/
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virtual void timerTick(const Time& when);
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/**
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* This method is called to send a RTP packet
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* @param data Pointer to raw RTP data
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* @param len Length of the data packet
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*/
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virtual void rtpData(const void* data, int len);
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/**
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* This method is called to send a RTCP packet
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* @param data Pointer to raw RTCP data
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* @param len Length of the data packet
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*/
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virtual void rtcpData(const void* data, int len);
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private:
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RTPProcessor* m_processor;
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RTPProcessor* m_monitor;
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Socket m_rtpSock;
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Socket m_rtcpSock;
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SocketAddr m_localAddr;
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SocketAddr m_remoteAddr;
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SocketAddr m_remoteRTCP;
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};
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/**
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* Base class that holds common sender and receiver methods
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* @short Common send/recv variables holder
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*/
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class YRTP_API RTPBaseIO
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{
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public:
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/**
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*
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*/
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inline RTPBaseIO()
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: m_ssrc(0), m_ts(0), m_seq(0),
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m_dataType(-1), m_eventType(-1), m_ciscoType(-1)
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{ }
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/**
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* Get the payload type for data packets
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* @return Payload type, -1 if not set
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*/
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inline int dataPayload() const
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{ return m_dataType; }
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/**
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* Set the payload type for data packets
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* @param type Payload type, -1 to disable
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* @return True if changed, false if invalid payload type
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*/
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bool dataPayload(int type);
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/**
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* Get the payload type for event packets
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* @return Payload type, -1 if not set
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*/
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inline int eventPayload() const
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{ return m_eventType; }
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/**
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* Set the payload type for event packets
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* @param type Payload type, -1 to disable
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* @return True if changed, false if invalid payload type
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*/
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bool eventPayload(int type);
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/**
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* Get the payload type for Cisco event packets
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* @return Payload type, -1 if not set
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*/
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inline int ciscoPayload() const
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{ return m_ciscoType; }
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/**
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* Set the payload type for Cisco event packets.
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* Thanks, Cisco, for a new and incompatible way of sending events.
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* @param type Payload type, -1 to disable
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* @return True if changed, false if invalid payload type
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*/
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bool ciscoPayload(int type);
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protected:
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u_int32_t m_ssrc;
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u_int32_t m_ts;
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u_int16_t m_seq;
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private:
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int m_dataType;
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int m_eventType;
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int m_ciscoType;
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};
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/**
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* Class that handles incoming RTP and RTCP packets
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* @short RTP/RTCP packet receiver
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*/
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class YRTP_API RTPReceiver : public RTPBaseIO
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{
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public:
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/**
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* Process one RTP payload packet.
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* Default behaviour is to call rtpRecvData() or rtpRecvEvent().
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* @param marker Set to true if the marker bit is set
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* @param payload Payload number
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* @param timestamp Sampling instant of the packet data
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* @param data Pointer to data block to process
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* @param len Length of the data block in bytes
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* @return True if data was handled
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*/
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virtual bool rtpRecv(bool marker, int payload, unsigned int timestamp,
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const void* data, int len);
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/**
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* Process one RTP data packet
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* @param marker Set to true if the marker bit is set
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* @param timestamp Sampling instant of the packet data
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* @param data Pointer to data block to process
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* @param len Length of the data block in bytes
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* @return True if data was handled
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*/
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virtual bool rtpRecvData(bool marker, unsigned int timestamp,
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const void* data, int len);
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/**
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* Process one RTP event
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* @param event Received event code
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* @param key Received key (for events 0-16) or zero
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* @param duration Duration of the event as number of samples
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* @param volume Attenuation of the tone, zero for don't care
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* @param timestamp Sampling instant of the initial packet data
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* @return True if data was handled
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*/
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virtual bool rtpRecvEvent(int event, char key, int duration,
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int volume, unsigned int timestamp);
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/**
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* Method called for unknown payload types just before attempting
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* to call rtpRecvData(). This is a good opportunity to change the
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* payload type and continue.
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* @param payload Payload number
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* @param timestamp Sampling instant of the unexpected packet data
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*/
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virtual void rtpNewPayload(int payload, unsigned int timestamp);
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private:
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bool decodeEvent(bool marker, unsigned int timestamp, const void* data, int len);
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bool decodeCisco(bool marker, unsigned int timestamp, const void* data, int len);
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void finishEvent(unsigned int timestamp);
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bool pushEvent(int event, int duration, int volume, unsigned int timestamp);
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};
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/**
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* Class that builds and sends RTP and RTCP packets
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* @short RTP/RTCP packet sender
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*/
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class YRTP_API RTPSender : public RTPBaseIO
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{
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/**
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* Send one RTP payload packet
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* @param marker Set to true if the marker bit must be set
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* @param payload Payload number
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* @param timestamp Sampling instant of the packet data
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* @param data Pointer to data block to send
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* @param len Length of the data block
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* @return True if data sending was attempted
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*/
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bool rtpSend(bool marker, int payload, unsigned int timestamp,
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const void* data, int len);
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/**
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* Send one RTP data packet
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* @param marker Set to true if the marker bit must be set
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* @param timestamp Sampling instant of the packet data
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* @param data Pointer to data block to send
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* @param len Length of the data block
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* @return True if data sending was attempted
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*/
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bool rtpSendData(bool marker, unsigned int timestamp,
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const void* data, int len);
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/**
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* Send one RTP event
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* @param event Event code to send
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* @param duration Duration of the event as number of samples
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* @param volume Attenuation of the tone, zero for don't care
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* @param timestamp Sampling instant of the packet data, zero to use current
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* @return True if data sending was attempted
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*/
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bool rtpSendEvent(int event, int duration, int volume = 0, unsigned int timestamp = 0);
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/**
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* Send one RTP key event
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* @param key Key to send
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* @param duration Duration of the event as number of samples
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* @param volume Attenuation of the tone, zero for don't care
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* @param timestamp Sampling instant of the packet data, zero to use current
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* @return True if data sending was attempted
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*/
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bool rtpSendKey(char key, int duration, int volume = 0, unsigned int timestamp = 0);
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};
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/**
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* An unidirectional or bidirectional RTP session
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* @short Full RTP session
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*/
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class YRTP_API RTPSession : public RTPProcessor
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{
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public:
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enum Direction {
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FullStop,
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RecvOnly,
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SendOnly,
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SendRecv
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};
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/**
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* Default constructor, creates a detached session
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*/
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RTPSession();
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/**
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* Destructor - shuts down the session and destroys the transport
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*/
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virtual ~RTPSession();
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/**
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* This method is called to process a RTP packet
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* @param data Pointer to raw RTP data
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* @param len Length of the data packet
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*/
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virtual void rtpData(const void* data, int len);
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/**
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* This method is called to process a RTCP packet
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* @param data Pointer to raw RTCP data
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* @param len Length of the data packet
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*/
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virtual void rtcpData(const void* data, int len);
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/**
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* Get the RTP/RTCP transport of data handled by this session
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* @return A pointer to the RTPTransport of this session
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*/
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inline RTPTransport* transport() const
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{ return m_transport; }
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/**
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* Set the RTP/RTCP transport of data handled by this session
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* @param trans A pointer to the new RTPTransport for this session
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*/
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void transport(RTPTransport* trans);
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/**
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* Get the direction of this session
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* @return Session's direction as a Direction enum
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*/
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inline Direction direction() const
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{ return m_direction; }
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/**
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* Set the direction of this session. A transport must exist for this
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* method to succeed.
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* @param dir New Direction for this session
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* @return True if direction was set, false if a failure occured
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*/
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bool direction(Direction dir);
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/**
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* Set the local network address of the RTP transport of this session
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* @param addr New local RTP transport address
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* @return True if address set, false if a failure occured
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*/
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inline bool localAddr(SocketAddr& addr)
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{ return m_transport ? m_transport->localAddr(addr) : false; }
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/**
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* Set the remote network address of the RTP transport of this session
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* @param addr New remote RTP transport address
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* @return True if address set, false if a failure occured
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*/
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inline bool remoteAddr(SocketAddr& addr)
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{ return m_transport ? m_transport->remoteAddr(addr) : false; }
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/**
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* Request a resync on the first packet arrived
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*/
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inline void resync()
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{ m_sync = true; }
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protected:
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/**
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* Method called periodically to push any asynchronous data or statistics
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* @param when Time to use as base in all computing
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*/
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virtual void timerTick(const Time& when);
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private:
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RTPTransport* m_transport;
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Direction m_direction;
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bool m_sync;
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u_int32_t m_rxSsrc;
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u_int32_t m_rxTs;
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u_int16_t m_rxSeq;
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u_int32_t m_txSsrc;
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u_int32_t m_txTs;
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u_int16_t m_txSeq;
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u_int32_t m_txNow;
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unsigned int m_evTs;
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int m_evNum;
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int m_evVol;
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};
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}
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#endif /* __YATERTP_H */
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/* vi: set ts=8 sw=4 sts=4 noet: */
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