Source: sourcestateinfo.h


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// ##########################################################################
// ####                                                                  ####
// ####                      RTP Audio Server Project                    ####
// ####                    ============================                  ####
// ####                                                                  ####
// #### Source State Info                                                ####
// ####                                                                  ####
// #### Version 1.00  --  February 04, 2001                              ####
// ####                                                                  ####
// #### Copyright (C) 1999  Thomas Dreibholz                             ####
// ####               2000  Universität Bonn, Abt. IV                    ####
// ####               2001  EMail: Dreibholz@bigfoot.com                 ####
// ####                     WWW:   http://www.bigfoot.com/~dreibholz     ####
// ####                                                                  ####
// ##########################################################################


#ifndef SOURCESTATEINFO_H
#define SOURCESTATEINFO_H


#include "system.h"
#include "synchronizable.h"
#include "seqnumvalidator.h"


namespace Coral {


/**
  * This class manages the source state information of an RTP receiver to
  * be transmitted by a RTCPSender.
  * See also RFC 1889 for more information on RTP.
  *
  * @short   Source State Info
  * @author  Thomas Dreibholz (Dreibholz@bigfoot.com)
  * @version 1.0
  *
  * @see RTPReceiver
  * @see RTCPSender
  */            
class SourceStateInfo : public SeqNumValidator,
                        public Synchronizable
{  
   // ====== Constructor ====================================================
   public:
   /**
     * Constructor.
     */
   SourceStateInfo();

  
   // ====== Reset ==========================================================
   /**
     * Reset.
     */
   void reset();

   
   // ====== Status functions ===============================================
   /**
     * Get SSRC.
     *
     * @return SSRC.
     */
   inline card32 getSSRC() const;

   /**
     * Get last sender report time stamp.
     *
     * @return LSR.
     */
   inline card32 getLSR() const;

   /**
     * Calculate delay since last sender report time stamp using current time.
     *
     * @return DLSR.
     */
   card32 calculateDLSR() const;

   /**
     * Set last sender report time stamp.
     *
     * @param lsr LSR.
     */
   inline void setLSR(const card32 lsr);

   /**
     * Set SSRC.
     *
     * @return SSRC.
     */
   inline void setSSRC(card32 ssrc);
   
   
   // ====== Private data ===================================================
   private:
   card64 LSRUpdateTimeStamp;             // Timestamp of last setLSR() call

   card32 ReceivedPrior;                  // Packet received at last interval
   card32 ExpectedPrior;                  // Packet expected at last interval 
   card32 FractionLost;                   // Fraction lost
   card32 SSRC;                           // Data source identifier
   card32 LSR;                            // Last SR packet from this source
};


}


#include "sourcestateinfo.icc"


#endif

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