多媒体网络通信技术大作业

多媒体网络通信技术大作业

电信1203

朱银啸

0121209310309

1、题目：基于局域网的可视对讲系统设计

2、系统开发环境与工具：

（1）、硬件环境：实验室局域网

（2）、软件环境：WindowsXP操作系统

（3）、开发工具：自己熟悉的面向对象的网络通信编程工具与平台，相关音频、视频编码与传输协议类库

3、要求与评分标准：

（1）要求：在以上硬软件环境下，利用合适的开发工具，设计一套可视对讲软件，实现局域网内两台计算机之间的可视对讲功能，要求音视频信号连续性、实时性较好，满足正常交流需要。

（2）评分标准

代码

客户端请求连接线程（呼叫处理）关键代码如下：

DWORD WINAPI ConnectThreadFunc(LPVOID pParam)

{

CChatRoomDlg *pChatRoom = (CChatRoomDlg *)pParam; ASSERT(pChatRoom ! = NULL);

pChatRoom ->m_ConnectSock = socket (AF_INET ,SOCK_STREAM , IPPROTO_TCP);

if ( pChatRoom->m_ConnectSock == INVALID_SOCKET) { AfxMessageBox(_T("新建Socket 失败！"));

return FALSE;

}

CString strServIp;

pChatRoom->GetDlgItemText(IDC_IP_ADDR, strServIp);

int iPort = pChatRoom ->GetDlgItemInt (IDC_CONNECT_PORT);

if( iPort <= 0 || iPort > 65535 ) {

AfxMessageBox(_T("请输入合适的端口：1 - 65535"));

goto __Error_End;

}

char szIpAddr[16] = {0};

USES_CONVERSION;

strcpy_s(szIpAddr, 16, T2A(strServIp));

sockaddr_in server;

server.sin_family = AF_INET;

server.sin_port = htons(iPort);

server.sin_addr.s_addr = inet_addr(szIpAddr);

if(connect(pChatRoom->m_ConnectSock,(struct sockaddr*)&server, sizeof(struct sockaddr)) == SOCKET_ERROR )

{

AfxMessageBox(_T("连接失败，请重试！"));

goto __Error_End;

}

pChatRoom->ShowMsg(_T(" 系统信息：连接服务器成功！"));

while( TRUE ) {

if ( SOCKET_Select(pChatRoom->m_ConnectSock) ) {

TCHAR szBuf[MAX_BUF_SIZE] = {0};

int iRet = recv (pChatRoom->m_ConnectSock, (char*)szBuf, MAX_BUF_SIZE, 0);

if ( iRet > 0 ) {

pChatRoom->ShowMsg(szBuf);

}else{

pChatRoom->ShowMsg(_T("聊天服务器已停止，请重新进行连接！")); break;

}

}

Sleep(500);

}

__Error_End:

closesocket(pChatRoom->m_ConnectSock);

return TRUE;

}

//捕获窗口

BOOL VideoCapture::Initialize()

{

char devname[128]={0},devversion[128]={0};

int index=0;

BOOL ret = TRUE, ret1 = TRUE, ret2 = TRUE, ret3 = TRUE;

TRACE("VideoCapture::Initialize\n");

//创建一个AVICap捕获窗口

m_capwnd = capCreateCaptureWindow("Capture",WS_POPUP,0,0,1,1,0,0); if(!m_capwnd){

return FALSE;

}

//connect callback functions

ret = capSetUserData(m_capwnd,this);

//Change destroy functions also........

ret1 = capSetCallbackOnVideoStream(m_capwnd,OnCaptureVideo);

//得到已安装的捕获设备的名称及版本

ret2 = capGetDriverDescription(index,devname,100,devversion,100);

// Connect to webcam driver

//使一个捕获窗口与一个捕获设备连接或关联

ret3 = capDriverConnect(m_capwnd,index);

if(!(ret && ret1 && ret2 && ret3)){

// Device may be open already or it may not have been

// closed properly last time.

AfxMessageBox("Unable to open Video Capture Device");

// log.WriteString("\n Unable to connect driver to the window");

m_capwnd=NULL;

return FALSE;}

// Set the capture parameters

if(SetCapturePara()==FALSE)

{

// log.WriteString("\n Setting capture parameters failed"); capDriverDisconnect(m_capwnd); //使捕获窗口与一个捕获设备断开

return FALSE;