librecon-1.9-dev 1.9.6-1 / usr / include / reflow / MediaStream.hxx

#if !defined(MediaStream_hxx)
#define MediaStream_hxx

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <asio.hpp>
#include <asio/ssl.hpp>
#ifdef WIN32
#include <srtp.h>
#else
#include <srtp/srtp.h>
#endif

#include "dtls_wrapper/DtlsFactory.hxx"
#include "Flow.hxx"

using namespace reTurn;

namespace flowmanager
{

/**
  This class represents a media stream, that consists of a series of componenets 
  or flows.  For media streams based on RTP, there are two components per media 
  stream - one for RTP, and one for RTCP.

  Author: Scott Godin (sgodin AT SipSpectrum DOT com)
*/
class MediaStreamHandler
{
public:
   MediaStreamHandler() {}
   virtual ~MediaStreamHandler() {}

   virtual void onMediaStreamReady(const StunTuple& rtpTuple, const StunTuple& rtcpTuple) = 0;
   virtual void onMediaStreamError(unsigned int errorCode) = 0;
};

#define RTP_COMPONENT_ID   1
#define RTCP_COMPONENT_ID  2

class MediaStream
{
public:
   enum NatTraversalMode
   {
      NoNatTraversal,
      StunBindDiscovery,
      TurnAllocation
   };

   enum SrtpCryptoSuite
   {
      SRTP_AES_CM_128_HMAC_SHA1_32,
      SRTP_AES_CM_128_HMAC_SHA1_80
   };

   MediaStream(asio::io_service& ioService,
               asio::ssl::context& sslContext,
               MediaStreamHandler& mediaStreamHandler,
               const StunTuple& localRtpBinding, 
               const StunTuple& localRtcpBinding,   // pass in transport type = None to disable RTCP
               dtls::DtlsFactory* dtlsFactory = 0,
               NatTraversalMode natTraversalMode = NoNatTraversal,
               const char* natTraversalServerHostname = 0, 
               unsigned short natTraversalServerPort = 0, 
               const char* stunUsername = 0,
               const char* stunPassword = 0); 
   virtual ~MediaStream();

   Flow* getRtpFlow() { return mRtpFlow; }
   Flow* getRtcpFlow() { return mRtcpFlow; }

   // SRTP methods - should be called before sending or receiving on RTP or RTCP flows
   bool createOutboundSRTPSession(SrtpCryptoSuite cryptoSuite, const char* key, unsigned int keyLen);
   bool createInboundSRTPSession(SrtpCryptoSuite cryptoSuite, const char* key, unsigned int keyLen);

protected:
   friend class Flow;

   // SRTP members
   dtls::DtlsFactory* mDtlsFactory;
   volatile bool mSRTPSessionInCreated;
   volatile bool mSRTPSessionOutCreated;
   resip::Mutex mMutex;
   SrtpCryptoSuite mCryptoSuiteIn;
   SrtpCryptoSuite mCryptoSuiteOut;
   uint8_t mSRTPMasterKeyIn[SRTP_MASTER_KEY_LEN];
   uint8_t mSRTPMasterKeyOut[SRTP_MASTER_KEY_LEN];
   srtp_policy_t mSRTPPolicyIn;
   srtp_policy_t mSRTPPolicyOut;
   srtp_t mSRTPSessionIn;
   srtp_t mSRTPSessionOut;

   err_status_t srtpProtect(void* data, int* size, bool rtcp);
   err_status_t srtpUnprotect(void* data, int* size, bool rtcp);
  
   // Nat Traversal Members
   NatTraversalMode mNatTraversalMode;
   resip::Data mNatTraversalServerHostname;
   unsigned short mNatTraversalServerPort;
   resip::Data mStunUsername;
   resip::Data mStunPassword;

private:
   // Note: these member variables are set at creation time and never changed, thus
   //       they do not require mutex protection
   MediaStreamHandler& mMediaStreamHandler;
   bool mRtcpEnabled;

   Flow* mRtpFlow;
   Flow* mRtcpFlow;

   virtual void onFlowReady(unsigned int componentId);
   virtual void onFlowError(unsigned int componentId, unsigned int errorCode);
};

}

#endif


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