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DSocket.cpp
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DSocket.cpp
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////////////////////////////////////////////////////////////////////////////
//
//
// Project : VideoNet version 1.1.
// Description : Peer to Peer Video Conferencing over the LAN.
// Author : Nagareshwar Y Talekar ( nsry2002@yahoo.co.in)
// Date : 15-6-2004.
//
//
// File description :
// Name : DSocket.cpp
// Details : Datagram Socket for communication
//
//
// *** Control Packet Format ***
// Type : 1 byte
// Length of hostname : 1 byte
// Hostname : <var>
//
// *** Text packet format ***
// Type : 1 byte
// Length of hostname : 1 byte
// Hostname : < var>
// Length of message : 2 byte
// Message : <var>
//
// *** Audio packet format ***
// Type : 1 byte
// Length of hostname : 1 byte
// Hostname : < var>
// size of audio data : 2 byte
// Audio data : <var>
//
// *** Video packet format ***
// Type : 1 byte
// Length of hostname : 1 byte
// Hostname : < var>
// size of video data : 2 byte
// Video data : <var>
//
//
//
/////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "VideoNet.h"
#include "DSocket.h"
#include "VideoNetDlg.h"
#include "RequestDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// DSocket
// Initialize static members...
char DSocket::remoteaddress[500]="";
char DSocket::remotename[500]="";
unsigned char DSocket::data[20000];
unsigned char DSocket::vdata[300000];
unsigned char DSocket::adata[50000];
unsigned int DSocket::length=20000;
unsigned int DSocket::vlength=300000;
unsigned int DSocket::alength=50000;
DSocket::DSocket()
{
}
DSocket::~DSocket()
{
}
// Do not edit the following lines, which are needed by ClassWizard.
#if 0
BEGIN_MESSAGE_MAP(DSocket, CSocket)
//{{AFX_MSG_MAP(DSocket)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
#endif // 0
/////////////////////////////////////////////////////////////////////////////
// DSocket member functions
/**
* Creates datagram socket on specified port
* @param port Port on which datagram socket is created
* @param type type indicates the purpose of this socket
* which can be control, audio or video.
*/
void DSocket::CreateSocket(int port,int dtype)
{
this->Create(port,SOCK_DGRAM);
type=dtype;
// Get host name...
gethostname(localname,300);
}
void DSocket::SetParent(CDialog *dlg)
{
pdlg=dlg;
}
/**
* Invoked when any data arrives from the remote host
*
*/
void DSocket::OnReceive(int errcode)
{
CString address;
char hname[400],str[1000],mesg[500];
unsigned int port,retvalue;
int n,len;
RequestDlg rdlg(NULL);
// Note : if no error has occured then RETVALUE contains
// the COUNT of actual bytes received.
// Control type
if(type==TYPE_CONTROL)
{
retvalue=this->ReceiveFrom(data,length,address,port);
if(retvalue==SOCKET_ERROR)
return;
// Get host name from the data.
int i=0;
for( i=0;i<data[1];i++)
{
hname[i]=data[i+2];
}
hname[i]=0;
strcpy(remotename,hname);
strcpy(remoteaddress,(LPCTSTR)address);
switch(data[0])
{
// action : Remote user has sent the invitation for conference
// reaction : accept/reject the invitation
case MESG_CONNECT:
// display the accept , reject dialog box
rdlg.SetParameter(remotename,remoteaddress,pdlg);
rdlg.DoModal();
return;
// action : Remote user has disconnected
// reaction : destroy the conference
case MESG_DISCONNECT:
( (CVideoNetDlg*)pdlg)->DestroyConference();
sprintf(str,"User %s has disconnected",hname);
AfxMessageBox(str);
return;
// action : Remote user has accepted the invitation
// reaction : start the conference
case MESG_ACCEPT:
//AfxMessageBox("User has accepted the connection");
( (CVideoNetDlg*)pdlg)->StartConference();
return;
// action : Remote user has rejected the invitation
// reaction : what to do...?
case MESG_REJECT:
sprintf(str,"User %s has rejected your invitation",hname);
AfxMessageBox(str);
return;
}
return;
}
if(type==TYPE_AUDIO)
{
retvalue=this->ReceiveFrom(adata,alength,address,port);
if(retvalue==SOCKET_ERROR)
return;
// Play the audio
((CVideoNetDlg *)pdlg)->play->PostThreadMessage(WM_PLAYSOUND_PLAYBLOCK,retvalue,(LPARAM)adata);
return;
}
if(type==TYPE_VIDEO)
{
retvalue=this->ReceiveFrom(vdata,vlength,address,port);
if(retvalue==SOCKET_ERROR)
return;
((CVideoNetDlg *)pdlg)->DisplayRemoteFrame(vdata,retvalue);
return;
}
if(type==TYPE_TEXT)
{
retvalue=this->ReceiveFrom(data,length,address,port);
if(retvalue==SOCKET_ERROR)
return;
// Get host name from the data.
// Length of username
n=data[1];
int i=0;
for(i=0;i<n;i++)
{
hname[i]=data[i+2];
}
hname[i]=0;
len=data[n+2] | ( data[n+3]<<8 );
memcpy(mesg,&data[n+4],len);
mesg[len]=0;
sprintf(str,"%s >> %s ",hname,mesg);
// Display message in list box
((CVideoNetDlg *)pdlg)->DisplayMesg(str);
return;
}
}
/**
* Send the control data to remote host
*
*
*/
void DSocket::SendControlMessage(int type,char *address)
{
char data[1000];
int n;
// Prepare the data packet
// Type of control packet
data[0]=type;
// Length of hostname
n=strlen(localname);
data[1]=n;
// Name of the sender host
memcpy(&data[2],localname,n);
if(address==NULL)
{
SendTo(data,n+2,PORT_CONTROL,remoteaddress);
}
else
{
SendTo(data,n+2,PORT_CONTROL,address);
}
}
/**
* Send the audio data to remote host
*
*/
void DSocket::SendAudioData(unsigned char *data,int length)
{
SendTo(data,length,PORT_AUDIO,remoteaddress);
}
/**
* Send the VIDEO data to remote host
*
*/
void DSocket::SendVideoData(unsigned char *data,int length)
{
// Better to attach video header....
// If dynamic format is supported...
SendTo(data,length,PORT_VIDEO,remoteaddress);
}
/**
* Send the TEXT data to remote host
*
*/
void DSocket::SendTextData(unsigned char *data,short length)
{
unsigned char *packet=new unsigned char[length+500];
int n;
// Text message
packet[0]=TYPE_TEXT;
// Length of hostname
n=strlen(localname);
packet[1]=n;
// Hostname
memcpy(&packet[2],localname,n);
// Data length
packet[n+2]=(unsigned char) length;
packet[n+3]=(unsigned char) (length>>8);
// Data
memcpy(&packet[n+4],data,length);
SendTo(packet,n+4+length,PORT_TEXT,remoteaddress);
}
/**
* Closes the socket created by the createsocket method
*
*/
void DSocket::CloseSocket()
{
DSocket::Close();
}