RTCPAgent Class Reference

List of all members.

Public Member Functions
	RTCPAgent ()
virtual void	timeout (int)
virtual void	recv (Packet *p, Handler *h)
int	command (int argc, const char *const *argv)
Protected Member Functions
void	start ()
void	stop ()
void	sendpkt ()
Protected Attributes
int	running_
int	random_
int	seqno_
double	interval_
RTPSession *	session_
RTCP_Timer	rtcpup_timer_

---

Detailed Description

the RTCP Agent class that handles the control functions of the RTCP protocol

Definition at line 52 of file rtcp.cc.

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Constructor & Destructor Documentation

RTCPAgent::RTCPAgent

(

)

zero argument constructor

Definition at line 82 of file rtcp.cc.

References interval_, random_, running_, and seqno_.

        : Agent(PT_RTCP), session_(0), rtcpup_timer_(this)
{
        size_ = 128;
        bind_time("interval_", &interval_);
        bind("random_", &random_);
        bind("seqno_", &seqno_);
        running_ = 0;

}

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Member Function Documentation

void RTCPAgent::timeout

(

int

)

[virtual]

it defines how often RTCP packets are to be sent take it into concideration for QoS measurements as the bigger the interval of the RTCP packets the less accurate the network measurements

Parameters:

int

Definition at line 138 of file rtcp.cc.

References RTPSession::build_report(), interval_, random_, rtcpup_timer_, running_, sendpkt(), and session_.

Referenced by RTCP_Timer::expire().

{
        if (running_) {
                size_ = session_->build_report(0);
                sendpkt();
                double t = interval_;
                if (random_)
                        /* add some zero-mean white noise */
                        t += interval_ * Random::uniform(-0.5, 0.5);    
                rtcpup_timer_.resched(t);
                /* XXX */
                Tcl::instance().evalf("%s rtcp_timeout", session_->name());
        }
}

void RTCPAgent::recv	(	Packet *	p,
		Handler *	h
	)			[virtual]

it simples passes the RTCP packet to the SessionRTP instance

Definition at line 107 of file rtcp.cc.

References RTPSession::recv_ctrl(), and session_.

{
        session_->recv_ctrl(p);
}

int RTCPAgent::command	(	int	argc,
		const char *const *	argv
	)

handles the events defined in the TCP scripts

Definition at line 153 of file rtcp.cc.

References RTPSession::build_report(), sendpkt(), session_, start(), and stop().

{
        if (argc == 2) {
                if (strcmp(argv[1], "start") == 0) {
                        start();
                        return (TCL_OK);
                }
                if (strcmp(argv[1], "stop") == 0) {
                        stop();
                        return (TCL_OK);
                }
                if (strcmp(argv[1], "bye") == 0) {
                        size_ = session_->build_report(1);
                        sendpkt();
                        stop();
                        return (TCL_OK);
                }
        } else if (argc == 3) {
                if (strcmp(argv[1], "session") == 0) {
                        session_ = (RTPSession*)TclObject::lookup(argv[2]);
                        return (TCL_OK);
                }
        }

        return (Agent::command(argc, argv));
}

void RTCPAgent::start

(

)

[protected]

the start method for the RTCP agent

Definition at line 93 of file rtcp.cc.

References interval_, rtcpup_timer_, and running_.

Referenced by command().

{
        running_ = 1;
        
        rtcpup_timer_.resched(interval_);
        
}

void RTCPAgent::stop

(

)

[protected]

stop is called by a timer event

Definition at line 101 of file rtcp.cc.

References rtcpup_timer_, and running_.

Referenced by command().

{
        rtcpup_timer_.cancel();
        running_ = 0;
}

void RTCPAgent::sendpkt

(

)

[protected]

it creates the RTCP packet and fills in the packet header and the SR, RR reports

Definition at line 115 of file rtcp.cc.

References hdr_rtp::access(), RTPSession::access_hdr_rtp(), hdr_rtp::rr_, hdr_rtp::seqno(), seqno_, session_, hdr_rtp::sr_, RTPSession::srcid(), hdr_rtp::srcid(), and hdr_rtp::timestamp().

Referenced by command(), and timeout().

{
        Packet* p = allocpkt();
        hdr_rtp* rh = hdr_rtp::access(p);
        hdr_rtp* tmp = new hdr_rtp;
        tmp = session_->access_hdr_rtp();
        /* Fill in srcid_ and seqno */
        rh->seqno() = seqno_++;
        rh->srcid() = session_->srcid();
        rh->timestamp() = Scheduler::instance().clock();
        rh->sr_ = tmp->sr_;
        rh->rr_ = tmp->rr_;
        target_->recv(p);
}

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Member Data Documentation

int RTCPAgent::running_ [protected]

Definition at line 62 of file rtcp.cc.

Referenced by RTCPAgent(), start(), stop(), and timeout().

int RTCPAgent::random_ [protected]

Definition at line 63 of file rtcp.cc.

Referenced by RTCPAgent(), and timeout().

int RTCPAgent::seqno_ [protected]

Definition at line 64 of file rtcp.cc.

Referenced by RTCPAgent(), and sendpkt().

double RTCPAgent::interval_ [protected]

Definition at line 65 of file rtcp.cc.

Referenced by RTCPAgent(), start(), and timeout().

RTPSession* RTCPAgent::session_ [protected]

Definition at line 66 of file rtcp.cc.

Referenced by command(), recv(), sendpkt(), and timeout().

RTCP_Timer RTCPAgent::rtcpup_timer_ [protected]

Definition at line 67 of file rtcp.cc.

Referenced by start(), stop(), and timeout().

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The documentation for this class was generated from the following file:

• ns-allinone-2.30/ns-2.30/rtp/rtcp.cc