/Users/yzchen/ns/ns-allinone-2.33/ns-2.33/apps/rtp.h

/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1997 Regents of the University of California.
 * All rights reserved.
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 * modification, are permitted provided that the following conditions
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 *    documentation and/or other materials provided with the distribution.
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 *    must display the following acknowledgement:
 *      This product includes software developed by the MASH Research
 *      Group at the University of California Berkeley.
 * 4. Neither the name of the University nor of the Research Group may be
 *    used to endorse or promote products derived from this software without
 *    specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * @(#) $Header: /cvsroot/nsnam/ns-2/apps/rtp.h,v 1.14 2000/09/01 03:04:06 haoboy Exp $
 */

#ifndef ns_rtp_h
#define ns_rtp_h

#include "config.h"
#include "object.h"
#include "agent.h"
#include "timer-handler.h"

#define RTP_M 0x0080 // marker for significant events

/* rtp packet.  For now, just have srcid + seqno. */
struct hdr_rtp { 
        u_int32_t srcid_;
        int seqno_;
        //rtp flags indicating significant event(begining of talkspurt)
        u_int16_t flags_; 

        static int offset_;
        inline static int& offset() { return offset_; }
        inline static hdr_rtp* access(const Packet* p) {
                return (hdr_rtp*) p->access(offset_);
        }

        /* per-field member functions */
        u_int32_t& srcid() { return (srcid_); }
        int& seqno() { return (seqno_); }
        u_int16_t& flags() { return (flags_); }
};

class RTPSource : public TclObject {
public:
        RTPSource* next;

        RTPSource(u_int32_t srcid);
        inline u_int32_t srcid() { return (srcid_); }
        inline int np() { return (np_); }
        inline int snp() { return (snp_); }
        inline int ehsr() { return (ehsr_); }

        inline void np(int n) { np_ += n; }
        inline void snp(int n) { snp_ = n; }
        inline void ehsr(int n) { ehsr_ = n; }
protected:
        u_int32_t srcid_;
        int np_;
        int snp_;
        int ehsr_;
};

class RTPSession : public NsObject {
public:
        RTPSession();
        ~RTPSession();
        virtual void recv(Packet* p, Handler*);
        virtual void recv_ctrl(Packet* p);
        int command(int argc, const char*const* argv);
        inline u_int32_t srcid() { return (localsrc_->srcid()); }
        int build_report(int bye);
        void localsrc_update(int);
protected:
        RTPSource* allsrcs_;
        RTPSource* localsrc_;
        int build_sdes();
        int build_bye();
        RTPSource* lookup(u_int32_t);
        void enter(RTPSource*);
        int last_np_;
};

class RTPAgent;

class RTPTimer : public TimerHandler {
public: 
        RTPTimer(RTPAgent *a) : TimerHandler() { a_ = a; }
protected:
        virtual void expire(Event *e);
        RTPAgent *a_;
};

class RTPAgent : public Agent {
 public:
        RTPAgent();
        virtual void timeout(int);
        virtual void recv(Packet* p, Handler*);
        virtual int command(int argc, const char*const* argv);
        void advanceby(int delta);
        virtual void sendmsg(int nbytes, const char *flags = 0);
 protected:
        virtual void sendpkt();
        virtual void makepkt(Packet*);
        void rate_change();
        virtual void start();
        virtual void stop();
        virtual void finish();
        RTPSession* session_;
        double lastpkttime_;
        int seqno_;
        int running_;
        int random_;
        int maxpkts_;
        double interval_;
        RTPTimer rtp_timer_;
};


#endif