115 lines
4.4 KiB
C++
Executable File
115 lines
4.4 KiB
C++
Executable File
/**********
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This library is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**********/
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// "liveMedia"
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// Copyright (c) 1996-2015 Live Networks, Inc. All rights reserved.
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// An abstraction of a network interface used for RTP (or RTCP).
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// (This allows the RTP-over-TCP hack (RFC 2326, section 10.12) to
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// be implemented transparently.)
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// C++ header
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#ifndef _RTP_INTERFACE_HH
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#define _RTP_INTERFACE_HH
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#ifndef _MEDIA_HH
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#include <Media.hh>
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#endif
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#ifndef _GROUPSOCK_HH
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#include "Groupsock.hh"
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#endif
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// Typedef for an optional auxilliary handler function, to be called
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// when each new packet is read:
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typedef void AuxHandlerFunc(void* clientData, unsigned char* packet,
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unsigned& packetSize);
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typedef void ServerRequestAlternativeByteHandler(void* instance, u_int8_t requestByte);
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// A hack that allows a handler for RTP/RTCP packets received over TCP to process RTSP commands that may also appear within
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// the same TCP connection. A RTSP server implementation would supply a function like this - as a parameter to
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// "ServerMediaSubsession::startStream()".
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class tcpStreamRecord {
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public:
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tcpStreamRecord(int streamSocketNum, unsigned char streamChannelId,
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tcpStreamRecord* next);
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virtual ~tcpStreamRecord();
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public:
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tcpStreamRecord* fNext;
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int fStreamSocketNum;
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unsigned char fStreamChannelId;
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};
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class RTPInterface {
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public:
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RTPInterface(Medium* owner, Groupsock* gs);
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virtual ~RTPInterface();
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Groupsock* gs() const { return fGS; }
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void setStreamSocket(int sockNum, unsigned char streamChannelId);
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void addStreamSocket(int sockNum, unsigned char streamChannelId);
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void removeStreamSocket(int sockNum, unsigned char streamChannelId);
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static void setServerRequestAlternativeByteHandler(UsageEnvironment& env, int socketNum,
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ServerRequestAlternativeByteHandler* handler, void* clientData);
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static void clearServerRequestAlternativeByteHandler(UsageEnvironment& env, int socketNum);
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Boolean sendPacket(unsigned char* packet, unsigned packetSize);
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void startNetworkReading(TaskScheduler::BackgroundHandlerProc*
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handlerProc);
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Boolean handleRead(unsigned char* buffer, unsigned bufferMaxSize,
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// out parameters:
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unsigned& bytesRead, struct sockaddr_in& fromAddress,
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int& tcpSocketNum, unsigned char& tcpStreamChannelId,
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Boolean& packetReadWasIncomplete);
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// Note: If "tcpSocketNum" < 0, then the packet was received over UDP, and "tcpStreamChannelId"
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// is undefined (and irrelevant).
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// Otherwise (if "tcpSocketNum" >= 0), the packet was received (interleaved) over TCP, and
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// "tcpStreamChannelId" will return the channel id.
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void stopNetworkReading();
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UsageEnvironment& envir() const { return fOwner->envir(); }
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void setAuxilliaryReadHandler(AuxHandlerFunc* handlerFunc,
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void* handlerClientData) {
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fAuxReadHandlerFunc = handlerFunc;
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fAuxReadHandlerClientData = handlerClientData;
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}
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private:
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// Helper functions for sending a RTP or RTCP packet over a TCP connection:
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Boolean sendRTPorRTCPPacketOverTCP(unsigned char* packet, unsigned packetSize,
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int socketNum, unsigned char streamChannelId);
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Boolean sendDataOverTCP(int socketNum, u_int8_t const* data, unsigned dataSize, Boolean forceSendToSucceed);
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private:
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friend class SocketDescriptor;
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Medium* fOwner;
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Groupsock* fGS;
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tcpStreamRecord* fTCPStreams; // optional, for RTP-over-TCP streaming/receiving
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unsigned short fNextTCPReadSize;
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// how much data (if any) is available to be read from the TCP stream
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int fNextTCPReadStreamSocketNum;
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unsigned char fNextTCPReadStreamChannelId;
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TaskScheduler::BackgroundHandlerProc* fReadHandlerProc; // if any
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AuxHandlerFunc* fAuxReadHandlerFunc;
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void* fAuxReadHandlerClientData;
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};
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#endif
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