//
// Copyright (C) 2005 Andras Varga
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program; if not, see <http://www.gnu.org/licenses/>.
//


package inet.applications.udpapp;

import inet.applications.contract.IUDPApp;


//
// Video stream server. To be used with ~UDPVideoStreamCli.
//
// The server will wait for incoming "video streaming requests".
// When a request arrives, it draws a random video stream size
// using the videoSize parameter, and starts streaming to the client.
// During streaming, it will send UDP packets of size packetLen at every
// sendInterval, until videoSize is reached. The parameters packetLen
// and sendInterval can be set to constant values to create CBR traffic,
// or to random values (e.g. sendInterval=uniform(1e-6, 1.01e-6)) to
// accomodate jitter.
//
// The server can serve several clients, and several streams per client.
//
// Statistics:
//
// reqStreamBytes: statistic of bytelength of requested video streams.
// sentPkBytes: statistic of sent packets and sent bytes.
//
// @see ~UDPVideoStreamCli
//
simple UDPVideoStreamSvr like IUDPApp
{
    parameters:
        int localPort; // port to listen on
        volatile double sendInterval @unit(s); // interval between sending video stream packets
        volatile int packetLen @unit(B);  // length of a video packet in bytes
        volatile int videoSize @unit(B);  // length of full a video stream in bytes
        @display("i=block/app");
        @signal[sentPk](type=cPacket);
        @signal[reqStreamBytes](type=long);
        @statistic[reqStreamBytes](title="requested stream bytes"; record=count,sum,vector; interpolationmode=none);
        @statistic[sentPk](title="packets sent"; source=sentPk; record=count,"sum(packetBytes)","vector(packetBytes)"; interpolationmode=none);
    gates:
        input udpIn @labels(UDPControlInfo/up);
        output udpOut @labels(UDPControlInfo/down);
}

