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/* -*- 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.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /cvsroot/nsnam/ns-2/tcp/rtcp.cc,v 1.17 2000/09/01 03:04:06 haoboy Exp $";
#endif
#include <stdlib.h>
#include "config.h"
#include "agent.h"
#include "random.h"
#include "rtp.h"
class RTCPAgent;
class RTCP_Timer : public TimerHandler {
public:
RTCP_Timer(RTCPAgent *a) : TimerHandler() { a_ = a; }
protected:
virtual void expire(Event *e);
RTCPAgent *a_;
};
class RTCPAgent : public Agent {
public:
RTCPAgent();
virtual void timeout(int);
virtual void recv(Packet* p, Handler* h);
int command(int argc, const char*const* argv);
protected:
void start();
void stop();
void sendpkt();
int running_;
int random_;
int seqno_;
double interval_;
RTPSession* session_;
RTCP_Timer rtcp_timer_;
};
static class RTCPAgentClass : public TclClass {
public:
RTCPAgentClass() : TclClass("Agent/RTCP") {}
TclObject* create(int, const char*const*) {
return (new RTCPAgent());
}
} class_rtcp_agent;
/* XXX Could perhaps derive this from CBR. If so, use cbr_timer_ */
RTCPAgent::RTCPAgent()
: Agent(PT_RTCP), session_(0), rtcp_timer_(this)
{
size_ = 128;
bind_time("interval_", &interval_);
bind("random_", &random_);
bind("seqno_", &seqno_);
running_ = 0;
}
void RTCPAgent::start()
{
running_ = 1;
rtcp_timer_.resched(interval_);
}
void RTCPAgent::stop()
{
rtcp_timer_.cancel();
running_ = 0;
}
void RTCPAgent::recv(Packet* p, Handler*)
{
session_->recv_ctrl(p);
}
void RTCPAgent::sendpkt()
{
Packet* p = allocpkt();
hdr_rtp* rh = hdr_rtp::access(p);
/* Fill in srcid_ and seqno */
rh->seqno() = seqno_++;
rh->srcid() = session_->srcid();
target_->recv(p);
}
void RTCPAgent::timeout(int)
{
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);
rtcp_timer_.resched(t);
/* XXX */
Tcl::instance().evalf("%s rtcp_timeout", session_->name());
}
}
int RTCPAgent::command(int argc, const char*const* argv)
{
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 RTCP_Timer::expire(Event* /*e*/) {
a_->timeout(0);
}
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