MediaStream.hxx

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#if !defined(MediaStream_hxx)
#define MediaStream_hxx
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
// !slg! At least for builds in Visual Studio on windows this include needs to be above ASIO includes since inlined shared_from_this has 
// a different linkage signature if included after - haven't investigated the full details as to exactly why this happens
#include <memory>
 
namespace asio
{
   class io_context;
   typedef io_context io_service;
#ifdef USE_SSL
   namespace ssl
   {
      class context;
   }
#endif
}
 
#include "Srtp2Helper.hxx"
 
#include "dtls_wrapper/DtlsFactory.hxx"
#include "FlowContext.hxx"
#include "Flow.hxx"
#include "RTCPEventLoggingHandler.hxx"
#include "rutil/MediaConstants.hxx"
 
using namespace reTurn;
 
namespace flowmanager
{
 
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
   };
 
   MediaStream(asio::io_context& 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,
               bool forceCOMedia = false,
               std::shared_ptr<RTCPEventLoggingHandler> rtcpEventLoggingHandler = nullptr,
               std::shared_ptr<FlowContext> context = nullptr,
               bool validateTlsServerHostname = true);  // for TURN over TLS: see FlowManager::setValidateTlsServerHostname
   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(resip::MediaConstants::SrtpCryptoSuite cryptoSuite, const char* key, size_t keyLen);
   bool createInboundSRTPSession(resip::MediaConstants::SrtpCryptoSuite cryptoSuite, const char* key, size_t keyLen);
 
protected:
   friend class Flow;
 
   // SRTP members
   dtls::DtlsFactory* mDtlsFactory;
   volatile bool mSRTPSessionInCreated;
   volatile bool mSRTPSessionOutCreated;
   resip::Mutex mMutex;
   resip::MediaConstants::SrtpCryptoSuite mCryptoSuiteIn;
   resip::MediaConstants::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;
 
   srtp_err_status_t srtpProtect(void* data, int* size, bool rtcp);
   srtp_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;
   bool mForceCOMedia;
   bool mValidateTlsServerHostname;
 
private:
   // Note: these member variables are set at creation time and never changed, thus
   //       they do not require mutex protection
   MediaStreamHandler& mMediaStreamHandler;
   bool mRtcpEnabled;
 
   // Null until created: activating the RTP flow can call onFlowReady before the constructor
   // has set both
   Flow* mRtpFlow = nullptr;
   Flow* mRtcpFlow = nullptr;
 
   virtual void onFlowReady(unsigned int componentId);
   virtual void onFlowError(unsigned int componentId, unsigned int errorCode);
};
 
}
 
#endif
 
 
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