实验2 简单音频播放器程序实现.doc

实验2 简单音频播放器程序实现1. 上机实验报告二课程名称：多媒体技术班级：数媒*班实验日期：2014.3.31-4.11小组成员：指导教师：实验序号：02实验成绩：一、简单音频播放器程序实现二、实验目的及要求1、掌握使用DirectSound实现音频播放程序的方法；2、掌握创建缓冲区的方法；3、学会播放音频数据的方法；3、了解RIFF文件格式，学会读取WAV文件的方法；4、开发一个简单的基于MFC框架的音频播放器。三、实验环境本次上机实践所使用的平台和相关软件VS2012MFCwin7四、实验内容用MFC设计具有一般能播放*.mp3,*.wma,*.mdi,*.wav,*.avi,*.dat等文件，还有具有播放、暂停、停止、音量调节等功能。1、点击“打开”，添加播放资源2、单击“播放”，开始播放3、点击“暂停”，暂停播放；之后点击“恢复”，播放器继续播放4、单击“终止”，音乐播放停止5、滑动音量滑块调节音量大小五、调试过程及实验结果本次作业参考了优酷上的指导视频，然后仿照编写的。 在完成此次大作业的过程中遇到了很多问题，首先音量控制就是一个难点，最初完成的版本可以运行但音量无法控制，后来添加了一个函数解决问题：void CMUSIC_PLAYER_100511217Dlg:OnCustomdrawSlider(NMHDR* pNMHDR, LRESULT* pResult) UpdateData(true); m_vol=m_slider.GetPos()/10;SetVolumn(m_slider.GetPos();UpdateData(false);*pResult = 0;最终成果：六、总结过完成这个简易的音乐播放器，掌握到了MFC编程的基本方法，使自己的编程能力得到进一步的提高，学会使用DirectSound实现音频播放程序的方法。7、 附录player.cpp/ player.cpp : Defines the class behaviors for the application./#include stdafx.h#include player.h#include playerDlg.h#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE = _FILE_;#endif/ CMyAppBEGIN_MESSAGE_MAP(CMyApp, CWinApp)/AFX_MSG_MAP(CMyApp)/ NOTE - the ClassWizard will add and remove mapping macros here./ DO NOT EDIT what you see in these blocks of generated code!/AFX_MSGON_COMMAND(ID_HELP, CWinApp:OnHelp)END_MESSAGE_MAP()/ CMyApp constructionCMyApp:CMyApp()/ TODO: add construction code here,/ Place all significant initialization in InitInstance/ The one and only CMyApp objectCMyApp theApp;/ CMyApp initializationBOOL CMyApp:InitInstance()AfxEnableControlContainer();/ Standard initialization/ If you are not using these features and wish to reduce the size/ of your final executable, you should remove from the following/ the specific initialization routines you do not need.#ifdef _AFXDLLEnable3dControls();/ Call this when using MFC in a shared DLL#elseEnable3dControlsStatic();/ Call this when linking to MFC statically#endifCMyDlg dlg;m_pMainWnd = &dlg;int nResponse = dlg.DoModal();if (nResponse = IDOK)/ TODO: Place code here to handle when the dialog is/ dismissed with OKelse if (nResponse = IDCANCEL)/ TODO: Place code here to handle when the dialog is/ dismissed with Cancel/ Since the dialog has been closed, return FALSE so that we exit the/ application, rather than start the applications message pump.return FALSE;playerDlg.cpp/ playerDlg.cpp : implementation file/#include stdafx.h#include player.h#include playerDlg.h#includeMmsystem.h#includeDigitalv.h#pragma comment(lib,Winmm.lib)#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE = _FILE_;#endifHWND m_hWnd;MCI_OPEN_PARMS mciopenparms;DWORD ItemLength,ItemTo;DWORD item;/ CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialogpublic: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/ Implementationprotected:/AFX_MSG(CAboutDlg)/AFX_MSGDECLARE_MESSAGE_MAP();CAboutDlg:CAboutDlg() : CDialog(CAboutDlg:IDD)/AFX_DATA_INIT(CAboutDlg)/AFX_DATA_INITvoid CAboutDlg:DoDataExchange(CDataExchange* pDX)CDialog:DoDataExchange(pDX);/AFX_DATA_MAP(CAboutDlg)/AFX_DATA_MAPBEGIN_MESSAGE_MAP(CAboutDlg, CDialog)/AFX_MSG_MAP(CAboutDlg)/ No message handlers/AFX_MSG_MAPEND_MESSAGE_MAP()/ CMyDlg dialogCMyDlg:CMyDlg(CWnd* pParent /*=NULL*/): CDialog(CMyDlg:IDD, pParent)/AFX_DATA_INIT(CMyDlg)m_int = 0;/AFX_DATA_INIT/ Note that LoadIcon does not require a subsequent DestroyIcon in Win32m_hIcon = AfxGetApp()-LoadIcon(IDI_ICON1);void CMyDlg:DoDataExchange(CDataExchange* pDX)CDialog:DoDataExchange(pDX);/AFX_DATA_MAP(CMyDlg)DDX_Control(pDX, IDC_volslider, m_controlvol);DDX_Control(pDX, IDC_playslider, m_process);DDX_Text(pDX, IDC_EDIT1, m_int);/AFX_DATA_MAPBEGIN_MESSAGE_MAP(CMyDlg, CDialog)/AFX_MSG_MAP(CMyDlg)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_about, Onabout)ON_BN_CLICKED(IDC_exit, Onexit)ON_BN_CLICKED(IDC_play, Onplay)ON_WM_TIMER()ON_BN_CLICKED(IDC_filechoice, Onfilechoice)ON_NOTIFY(NM_CUSTOMDRAW, IDC_playslider, OnCustomdrawplayslider)ON_BN_CLICKED(IDC_pause, Onpause)ON_BN_CLICKED(IDC_stop, Onstop)ON_NOTIFY(NM_CUSTOMDRAW, IDC_volslider, OnCustomdrawvolslider)/AFX_MSG_MAPEND_MESSAGE_MAP()/ CMyDlg message handlersBOOL CMyDlg: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 AppendMenu(MF_SEPARATOR);pSysMenu-AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);/ Set the icon for this dialog. The framework does this automatically/ when the applications main window is not a dialogSetIcon(m_hIcon, TRUE);/ Set big iconSetIcon(m_hIcon, FALSE);m_controlvol.SetRange(0,1500);m_controlvol.SetPos(750);GetDlgItem(IDC_play)-EnableWindow(false);GetDlgItem(IDC_pause)-EnableWindow(false);GetDlgItem(IDC_stop)-EnableWindow(false);/ Set small icon/ TODO: Add extra initialization herereturn TRUE; / return TRUE unless you set the focus to a controlvoid CMyDlg:OnSysCommand(UINT nID, LPARAM lParam)if (nID & 0xFFF0) = IDM_ABOUTBOX)CAboutDlg dlgAbout;dlgAbout.DoModal();elseCDialog: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 CMyDlg:OnPaint() if (IsIconic()CPaintDC dc(this); / device context for paintingSendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);/ Center icon in client rectangleint 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 icondc.DrawIcon(x, y, m_hIcon);elseCDialog:OnPaint();/ The system calls this to obtain the cursor to display while the user drags/ the minimized window.HCURSOR CMyDlg:OnQueryDragIcon()return (HCURSOR) m_hIcon;DWORD GetLength(DWORD dwitem) /根据参数获取媒体文件信息/*/接受传入的命令参数，命令参数如下： MCI_STATUS_LENGTH获取总播放时间，MCI_STATUS_POSITION获取当前已播放时间： */MCI_STATUS_PARMS mcistatusparms; mcistatusparms.dwCallback=(DWORD)m_hWnd; mcistatusparms.dwItem=dwitem; mcistatusparms.dwReturn=0; /返回值初始化mciSendCommand(mciopenparms.wDeviceID,MCI_STATUS,MCI_STATUS_ITEM,(DWORD)&mcistatusparms);return mcistatusparms.dwReturn;void open(CString strnamepath)mciSendCommand(mciopenparms.wDeviceID,MCI_CLOSE,0,0);mciopenparms.lpstrElementName=strnamepath;DWORD dwReturn; if(dwReturn=mciSendCommand(NULL,MCI_OPEN,MCI_OPEN_ELEMENT|MCI_WAIT,(DWORD)(LPVOID)&mciopenparms)/打开失败，显示警告，并存储错误信息char buffer256;mciGetErrorString(dwReturn,buffer,256);MessageBox(m_hWnd,buffer,出错警告！,MB_ICONHAND|MB_ICONERROR|MB_ICONSTOP);item=MCI_MAKE_HMS(0,0,0); void play()MCI_PLAY_PARMS mciplayparms;ItemLength=GetLength(MCI_STATUS_LENGTH); /得到播放长度 ItemTo=MCI_MAKE_HMS(MCI_HMS_HOUR(ItemLength), MCI_HMS_MINUTE(ItemLength), MCI_HMS_SECOND(ItemLength); /根据长度计算出时、分、秒mciplayparms.dwCallback=NULL; mciplayparms.dwFrom=item; /播放起点mciplayparms.dwTo=ItemTo; /播放终点 mciSendCommand(mciopenparms.wDeviceID,MCI_PLAY,MCI_FROM|MCI_NOTIFY,(DWORD)(LPVOID)&mciplayparms);void pause()DWORD dwsf=GetLength(MCI_STATUS_POSITION);item=MCI_MAKE_MSF(MCI_MSF_MINUTE(dwsf), MCI_MSF_SECOND(dwsf), MCI_MSF_FRAME(dwsf);mciSendCommand(mciopenparms.wDeviceID,MCI_PAUSE,0,0);void resume() mciSendCommand(mciopenparms.wDeviceID,MCI_RESUME,0,0);void stop()mciSendCommand(mciopenparms.wDeviceID,MCI_STOP,0,0);mciSendCommand(mciopenparms.wDeviceID,MCI_SEEK,MCI_SEEK_TO_START,0); mciSendCommand(mciopenparms.wDeviceID,MCI_CLOSE,0,0);item=MCI_MAKE_HMS(0,0,0);DWORD setvolume(DWORD vol)MCI_DGV_SETAUDIO_PARMS mcisetvolume;mcisetvolume.dwCallback=NULL;mcisetvolume.dwItem=MCI_DGV_SETAUDIO_VOLUME;mcisetvolume.dwValue=vol;mciSendCommand(mciopenparms.wDeviceID,MCI_SETAUDIO,MCI_DGV_SETAUDIO_VALUE|MCI_DGV_SETAUDIO_ITEM,(DWORD)(LPVOID)&mcisetvolume);return 0;void CMyDlg:Onabout() CAboutDlg dlg;dlg.DoModal();/ TODO: Add your control notification handler code herevoid CMyDlg:Onexit() CDialog:OnCancel();/ TODO: Add your control notification handler code herevoid CMyDlg:Onplay() DWORD cdlen=GetLength(MCI_STATUS_LENGTH);play();m_process.SetRange(0,cdlen);SetTimer(0,1000,NULL);/ TODO: Add your control notification handler code herevoid CMyDlg:Onfilechoice()char szfilefilter=mp3文件(*.mp3)|*.mp3| wma文件(*.wma)|*.wma|wav文件(*.wav)|*.wav|所有文件(*.*)|*.*|;CFileDialog dlg(true,NULL,NULL,OFN_HIDEREADONLY,szfilefilter);if(dlg.DoModal()=IDOK) CString strFilepath=dlg.GetPathName(); CString strFilename=dlg.GetFileName(); SetDlgItemText(IDC_filename,strFilename); open(strFilepath); GetDlgItem(IDC_play)-EnableWindow(true); GetDlgItem(IDC_pause)-EnableWin