程式架構與寫法介紹：b92043/homework/檔案...網際網路電話系統作業一程式說明文件...

網際網路電話系統作業一程式說明文件

資工四 B92902043 徐瑞澤

程式架構與寫法介紹：

助教您好，這次的作業我按照投影片上的說明在 SimpRTPDlg.cpp 中的CSimRTPDlg 程序加入 cclRTPStartup(2)以初始化 RTP 的物件並設定最大 channel數為 2，接著由於我有做使用者可以指定 port 的功能，所以 RTPOpenPort()這邊先不做，等到設定 peeraddress 的時候會再執行。接著在 OnOK 程序中利用以下程式碼： m_WaveIOObj->wavInClose();

m_WaveIOObj->wavOutClose(); 把 WavIO 關閉，然後我加入以下的程式碼處理使用者自訂的 port：

for (i=0; i

其中 newport 是我在 SimRTPDlg.cpp 檔案開頭自訂的一個 Global Variable，目的

是儲存使用者自訂的 Port，接著執行 RTPPeerConnect(IP, newport)。

另外為了達到使用者自訂 Port 的功能，我修改了 cclRtp.c 檔案，其中 cclRTPOpen

修改如下：

RETCODE cclRTPOpen(int channel, int rtpPacketSiz, int port)

{

if( channel=MAX_RTP_CHANS )

return -1;

if( rtp[channel] ) {

RTP_PACKET_SIZ[channel] = rtpPacketSiz;

return 1;

}

rtp[channel] = rtp_open(port,0);

if( !rtp[channel] )

return -1;

rtcp[channel] = rtcp_open(port+1,0);

if( !rtcp[channel] )

return -1;

return 0;

}

我在這個函數的參數列尾端新增了一個 port 的變數，以記錄使用者自訂的 Port

Number，另外在執行 rtp_open()與 rtcp_open()的地方，將第一個參數換成 port 與

port+1，這樣 Local 端的 port 才可以設成使用者自訂的 Port。

程式功能與操作方法：

如上，使用者輸入對方電腦的 IP 位址，對方也輸入自己電腦的 IP 位址，就會使用

預設的 Port9000 連線，如果輸入對方電腦的 IP 位址之後加一個冒號，後面接上欲使用

的 Port 號碼，對方也輸入自己電腦的 IP 位址加上 Port 號碼，就可以使用指定的 Port

傳輸資料，如下是使用 port9500 做傳輸，圖示如下：

SimRTPDlg.cpp Source Code：

// SimRTPDlg.cpp : implementation file

//

#include "stdafx.h"

#include "SimRTP.h"

#include "SimRTPDlg.h"

#include "cclRtp.c"

//#include "WavInOut.cpp"

#ifdef _DEBUG

#define new DEBUG_NEW

#undef THIS_FILE

static char THIS_FILE[] = __FILE__;

#endif

char IP[100];

int newport = 9000;

///////////////////////////////////////////////////////////////////////////

//

// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog

{

public:

CAboutDlg();

// Dialog Data

//{{AFX_DATA(CAboutDlg)

enum { IDD = IDD_ABOUTBOX };

//}}AFX_DATA

// ClassWizard generated virtual function overrides

//{{AFX_VIRTUAL(CAboutDlg)

protected:

virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support

//}}AFX_VIRTUAL

// Implementation

protected:

//{{AFX_MSG(CAboutDlg)

//}}AFX_MSG

DECLARE_MESSAGE_MAP()

};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)

{

//{{AFX_DATA_INIT(CAboutDlg)

//}}AFX_DATA_INIT

}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)

{

CDialog::DoDataExchange(pDX);

//{{AFX_DATA_MAP(CAboutDlg)

//}}AFX_DATA_MAP

}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)

//{{AFX_MSG_MAP(CAboutDlg)

// No message handlers

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

///////////////////////////////////////////////////////////////////////////

//

// CSimRTPDlg dialog

static CSimRTPDlg* csimrtpdlg = NULL;

CSimRTPDlg::CSimRTPDlg(CWnd* pParent /*=NULL*/)

: CDialog(CSimRTPDlg::IDD, pParent)

{

//{{AFX_DATA_INIT(CSimRTPDlg)

csimrtpdlg = this;

//}}AFX_DATA_INIT

// Note that LoadIcon does not require a subsequent DestroyIcon in Win32

m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

//-----------------------------------

//cclRTPStartup add here

cclRTPStartup(2);

//-----------------------------------

m_RtpChan=0;

m_BufRTP2IO=adtBufferNew(4096);

m_BufIO2RTP=adtBufferNew(4096);

m_WaveIOObj = WavInOut::instance();

m_WaveIOObj->init(Wav2RTP,RTP2Wav);

//-----------------------------------

//RTPOpenPort add here

//RTPOpenPort();

//-----------------------------------

m_bUDP=TRUE;

m_bTCP=FALSE;

m_bCallAuto=TRUE;

m_flag = TRUE;

}

void CSimRTPDlg::DoDataExchange(CDataExchange* pDX)

{

CDialog::DoDataExchange(pDX);

//{{AFX_DATA_MAP(CSimRTPDlg)

DDX_Control(pDX, IDOK, m_OK);

DDX_Control(pDX, IDC_EDIT1, m_IP_CTL);

//}}AFX_DATA_MAP

}

BEGIN_MESSAGE_MAP(CSimRTPDlg, CDialog)

//{{AFX_MSG_MAP(CSimRTPDlg)

ON_WM_SYSCOMMAND()

ON_WM_PAINT()

ON_WM_QUERYDRAGICON()

ON_EN_CHANGE(IDC_EDIT1, OnChangeEdit1)

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

///////////////////////////////////////////////////////////////////////////

//

// CSimRTPDlg message handlers

BOOL CSimRTPDlg::OnInitDialog()

{

CDialog::OnInitDialog();

// Add "About..." menu item to system menu.

// IDM_ABOUTBOX must be in the system command range.

ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);

ASSERT(IDM_ABOUTBOX < 0xF000);

CMenu* pSysMenu = GetSystemMenu(FALSE);

if (pSysMenu != NULL)

{

CString strAboutMenu;

strAboutMenu.LoadString(IDS_ABOUTBOX);

if (!strAboutMenu.IsEmpty())

{

pSysMenu->AppendMenu(MF_SEPARATOR);

pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);

}

}

// Set the icon for this dialog. The framework does this automatically

// when the application's main window is not a dialog

SetIcon(m_hIcon, TRUE); // Set big icon

SetIcon(m_hIcon, FALSE); // Set small icon

// TODO: Add extra initialization here

m_IP_CTL.SetFocus();

return TRUE; // return TRUE unless you set the focus to a control

}

void CSimRTPDlg::OnSysCommand(UINT nID, LPARAM lParam)

{

if ((nID & 0xFFF0) == IDM_ABOUTBOX)

{

CAboutDlg dlgAbout;

dlgAbout.DoModal();

}

else

{

CDialog::OnSysCommand(nID, lParam);

}

}

// If you add a minimize button to your dialog, you will need the code below

// to draw the icon. For MFC applications using the document/view model,

// this is automatically done for you by the framework.

void CSimRTPDlg::OnPaint()

{

if (IsIconic())

{

CPaintDC dc(this); // device context for painting

SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

// Center icon in client rectangle

int cxIcon = GetSystemMetrics(SM_CXICON);

int cyIcon = GetSystemMetrics(SM_CYICON);

CRect rect;

GetClientRect(&rect);

int x = (rect.Width() - cxIcon + 1) / 2;

int y = (rect.Height() - cyIcon + 1) / 2;

// Draw the icon

dc.DrawIcon(x, y, m_hIcon);

}

else

{

CDialog::OnPaint();

}

}

// The system calls this to obtain the cursor to display while the user drags

// the minimized window.

HCURSOR CSimRTPDlg::OnQueryDragIcon()

{

return (HCURSOR) m_hIcon;

}

void CSimRTPDlg::OnCancel()

{

// TODO: Add extra cleanup here

m_WaveIOObj->stopPlaying();

m_WaveIOObj->stopRecording();

if(m_WaveIOObj->isWavInOpen) m_WaveIOObj->wavInClose();

if(m_WaveIOObj->isWavOutOpen) m_WaveIOObj->wavOutClose();

CDialog::OnCancel();

}

void CSimRTPDlg::OnChangeEdit1()

{

// TODO: If this is a RICHEDIT control, the control will not

// send this notification unless you override the CDialog::OnInitDialog()

// function and call CRichEditCtrl().SetEventMask()

// with the ENM_CHANGE flag ORed into the mask.

// TODO: Add your control notification handler code here

}

void CSimRTPDlg::OnOK()

{

//User specified port stored here

char assign_port[10];

int i, j;

int flag = 0;

int m;

//-----------------------------------

// TODO: Add extra validation here

m_WaveIOObj->wavInClose();

m_WaveIOObj->wavOutClose();

//-----------------------------------

//CDialog::OnOK();

int t;

t = m_IP_CTL.GetWindowText(IP, 100);

for (i=0; i

m = i;

j = 0;

i += 1;

while(IP[i] != '\0') {

assign_port[j] = IP[i];

i += 1;

j += 1;

}

newport = atoi(assign_port);

for(i=m; istopPlaying();




if( TRUE == m_flag ) {

m_flag = FALSE;

m_OK.SetWindowText("掛斷");

//-----------------------------------

//RTPPeerConnect add here, assign target ip and port here.

RTPPeerConnect(IP, newport);

//-----------------------------------

adtBufferClear(m_BufRTP2IO);

adtBufferClear(m_BufIO2RTP);

if(m_WaveIOObj->wavInOpen(wavetype,8,8000,1,30)!=0)

m_IP_CTL.SetWindowText("Open WaveIO Error!");

else if ( m_WaveIOObj->startRecording()!=0 )

m_IP_CTL.SetWindowText("Record Error!");

if(m_WaveIOObj->wavOutOpen(wavetype,8,8000,1,30)!=0)

m_IP_CTL.SetWindowText("Open WaveOut Error!");

else if ( m_WaveIOObj->startPlaying()!=0 )

m_IP_CTL.SetWindowText("Playing Error!");

}

else {

m_flag = TRUE;

m_OK.SetWindowText("連線");

}

}

int CSimRTPDlg::RTPEventHandler(int channel,const char* buffer,int buflen)

{

return adtBufferWrite(csimrtpdlg->m_BufRTP2IO,((char *) buffer),buflen);

}

int CSimRTPDlg::Wav2RTP(char* buff, int len)

{

char buffer[1024];

int xlen=0;

memcpy(buffer,buff,len);

xlen = cclRTPWrite(csimrtpdlg->m_RtpChan,buffer,len);

return (xlen>=len)?len:xlen;

}

int CSimRTPDlg::RTP2Wav(char* buff, int len)

{

return adtBufferRead(csimrtpdlg->m_BufRTP2IO,buff,len);

}

int CSimRTPDlg::MediaConnection()

{

return 0;

}

int CSimRTPDlg::MediaPlayTone()

{

return 0;

}

int CSimRTPDlg::Media_RTP_Stop()

{

m_WaveIOObj->stopPlaying();






cclRTPClose(m_RtpChan);



return 0;

}

int CSimRTPDlg::RTPOpenPort()

{

int result=0;

result=cclRTPOpen(m_RtpChan, 240, newport); /*240 = packet size */

return result;

}

int CSimRTPDlg::RTPPeerConnect(CString ip,int port) int CSimRTPDlg::RTPPeerConnect(CString ip,int port)

{ {

CString buf; CString buf;

buf.Format("[RTP] Open Peer RTP: IP(%s),Port(%d)\n",ip,port); buf.Format("[RTP] Open Peer RTP: IP(%s),Port(%d)\n",ip,port);

RTPOpenPort(); RTPOpenPort();

cclRTPSetPeerAddr(m_RtpChan,(LPSTR)(LPCSTR)ip,port); cclRTPSetPeerAddr(m_RtpChan,(LPSTR)(LPCSTR)ip,port);

buf.Format("[RTP] Get had open RTP listen Port

(%d)\n",cclRTPGetPort(m_RtpChan));

buf.Format("[RTP] Get had open RTP listen Port

(%d)\n",cclRTPGetPort(m_RtpChan));

cclRTPSetEventHandler(RTPEventHandler); /*set event handler */ cclRTPSetEventHandler(RTPEventHandler); /*set event handler */

return 0; return 0;

} }

RTP封包：

RTCP 封包：

查看程式碼(rtcp.c)的內容與 Ethereal 實際擷取的結果，此程式似乎並無傳送

RTCP 封包，所以只有附上 RTCP 的規格圖如下。

程式架構與寫法介紹：b92043/homework/檔案...網際網路電話系統作業一程式說明文件...

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