VODemo源码阅读（1）

VODemo的代码看了很久了，以前把框架梳理过一遍，现在要改写它并加入一些功能，于是又重新阅读源码。

程序进行CVODServerDlg::OnInitDialog()

BOOL CVODServerDlg::OnInitDialog(){CDialog::OnInitDialog();// Set the icon for this dialog. The framework does this automatically// when the application's main window is not a dialogSetIcon(m_hIcon, TRUE);// Set big iconSetIcon(m_hIcon, FALSE);// Set small icon// TODO: Add extra initialization herechar hostName[100];char hostIP[50];if (UNetwork::GetHostInfo(hostIP, hostName)){CString info;info.Format("Host: %s IP: %s Command Port (UDP) : %d",hostName, hostIP, SERVER_UDP_PORT);mEditHostInfo.SetWindowText(info);}mProgramListCtrl.SetExtendedStyle(LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES);mProgramListCtrl.InsertColumn(0, "File", LVCFMT_CENTER, 120);mProgramListCtrl.InsertColumn(1, "Type", LVCFMT_CENTER, 80);mProgramListCtrl.InsertColumn(2, "Size", LVCFMT_CENTER, 80);mProgramListCtrl.InsertColumn(3, "PID", LVCFMT_CENTER, 60);LoadProgramList();// Set up command listeningmCommandManager.AddMsgReceiver(this);mCommandManager.SetLocalPort(SERVER_UDP_PORT);if (mCommandManager.CreateReceiver()){mCommandManager.StartReceiving();} return TRUE; // return TRUE unless you set the focus to a control}

 OnInitDialog中加入了一些界面初始化代码，如对在静态控件中显示IP，在CListCtrl中SetExtendedStyle及InsertColumn等。这里对CListCtrl加入了4列，即"file","type","size",pid"等。之后调用LoadProgramList导入媒体列表：

void CVODServerDlg::AddProgramItem(CMediaInfo & inMedia){int count = mProgramListCtrl.GetItemCount();mProgramListCtrl.InsertItem(count, inMedia.mFilePath);// Determine file typeCString str;switch (inMedia.mFileType){case FT_MPEG1:str = "MPEG1";break;case FT_MPEG2:str = "MPEG2";break;case FT_AVI:str = "AVI";break;case FT_MP3:str = "MP3";break;case FT_T264: //hainei 264 videocase FT_H264:str = "264";break;default:str = "Unknown";break;}mProgramListCtrl.SetItemText(count, 1, str);str.Format("%.3fM", inMedia.mFileSize / 1024. / 1024.);mProgramListCtrl.SetItemText(count, 2, str);str.Format("%d", inMedia.mProgramId);mProgramListCtrl.SetItemText(count, 3, str);// Save to the list toomPrgrmList.AddTail(inMedia);}

在LoadProgramList中

  long count = 0;
  ar >> count;

读入媒体个数，也即CListCtrl的item数，之后用一个for循环来导入每一分媒体文件的"file","type","size",pid"

 

 

server端打开媒体--程序执行流程

 void CVODServerDlg::OnButtonAdd(){CMediaInfo media;CAddFileDlg dlg;dlg.SetMediaInfo(&media);if (dlg.DoModal() == IDOK){AddProgramItem(media);}}

上面的SetMediaInfo是将media变量与AddDlg的mMedia相关联。

程序执行到dlg.DoModal之后，AddDlg的初始化函数InitDialog开始执行

BOOL CAddFileDlg::OnInitDialog() {CDialog::OnInitDialog();// TODO: Add extra initialization hereASSERT(mMedia);if (!mIsEdit) // Non-edit mode{BOOLisSourceOK = FALSE;CString strFilter = "MPEG Files (*.mpg;*.mpeg)|*.mpg;*.mpeg|";strFilter += "AVI Files (*.avi)|*.avi|";strFilter += "MP3 Files (*.mp3)|*.mp3|";strFilter += "H264 Files (*.264)|*.264|"; //hainei include filestrFilter += "All Files (*.*)|*.*|";CFileDialog dlg(TRUE, NULL, NULL, OFN_HIDEREADONLY, strFilter, NULL);if (IDOK == dlg.DoModal()) {//这里获得mMedia的成员变量值,mFilePath,mFileSize,mFileTypeisSourceOK = mMedia->SetFilePath(dlg.GetPathName());}if (!isSourceOK){GetDlgItem(IDOK)->EnableWindow(FALSE);}}// Update UI controlsmSourceFile = mMedia->mFilePath;mFileSize = mMedia->mFileSize;mPID = mMedia->mProgramId;// Determine file typeswitch (mMedia->mFileType){case FT_MPEG1:mFileType = "MPEG1";break;case FT_MPEG2:mFileType = "MPEG2";break;case FT_AVI:mFileType = "AVI";break;case FT_MP3:mFileType = "MP3";break;case FT_T264:case FT_H264:mFileType = "264";break;default:mFileType = "Unknown";break;}UpdateData(FALSE);return TRUE; // return TRUE unless you set the focus to a control // EXCEPTION: OCX Property Pages should return FALSE}

这里就确定了媒体的

 char mFilePath[MAX_FILE_PATH];
 long mProgramId;
 long mFileType;
 long mFileSize;
 long mCheckSize;     //用于格式校验的数据量
 long mCheckOffset2; //额外的格式数据在文件中的偏移量 // Meaningful to AVI

这样一些变量。

 

OnInitDialog中的

  if (IDOK == dlg.DoModal())
  {
   //这里获得mMedia的成员变量值,mFilePath,mFileSize,mFileType
   isSourceOK = mMedia->SetFilePath(dlg.GetPathName());
  }

设置媒体路径及其它一些参数

//设置文件路径BOOL CMediaInfo::SetFilePath(const char * inFile){//对文件进行分析（获取文件类型、文件大小、额外格式数据的偏移量等）if (ParseFile(inFile)){strcpy(mFilePath, inFile);return TRUE;}return FALSE;}

 

 

//分析文件BOOL CMediaInfo::ParseFile(const char * inFile){// At first, get the file size//得到文件大小mFileSize = 0;CFileStatus fileStatus;if (CFile::GetStatus(inFile, fileStatus)){mFileSize = fileStatus.m_size;}// Get the file extension//根据文件扩展名初步判断文件类型CString strExt = strrchr(inFile, '.');if (strExt.CompareNoCase(".mpeg") == 0 ||strExt.CompareNoCase(".mpg") == 0 ||strExt.CompareNoCase(".vob") == 0){// Further checking...//进一步检查这个文件是MPEG1还是MPEG2CheckMpegFile(inFile);}else if (strExt.CompareNoCase(".avi") == 0){// Further checking...//进一步获得AVI文件索引块的偏移量CheckAviFile(inFile);}else if (strExt.CompareNoCase(".mp3") == 0){//这是一个mp3文件mFileType = FT_MP3;}else if (strExt.CompareNoCase(".264") == 0){//hainei 这是一个264文件Check264File(inFile);}else{AfxMessageBox("This file type is not supported!");return FALSE;}return TRUE;}