多媒体实验报告-3

多媒体实验报告一姓名：方子乙 学号：201100300336班级：2011级软件6班

一、实验目的1、熟悉和掌握使用WindowsMCI进行编程的基本原理和方法。2、熟悉各种不同的音频文件格式。3、了解音频压缩的实现方法。二、实验内容 使用WindowsAPI和一种高级语言，编程实现类似于Windows录音机一类的小工具，要求能播放wav文件、mid文件，并实现打开、播放、暂停、停止、录音、保存(快进、快退)等功能。 更高要求：能实现压缩录音三、实验环境硬件：耳机麦克风软件：VisualC++6.0（或VisualBasic，Java），WindowsMCI四、实验步骤1、创建一个基于对话框的工程，如play。2、在对话框上添加相应的按钮，实现如录音、存盘、打开文件、暂停、播放、停止、前进、后退等项功能。可考虑添加滑动条（slider控件）用来反映目前的播放位置，等等。3、为各个按钮添加相应的函数。4、调试，运行。五、主要代码//playDlg.cpp:implementationfile//#include"stdafx.h"#include"play.h"#include"playDlg.h"#include"MMSYSTEM.H"#include<iostream>#ifdef_DEBUG#definenewDEBUG_NEW#undefTHIS_FILEstaticcharTHIS_FILE[]=__FILE__;#endif///////////////////////////////////////////////////////////////////////////////CPlayDlgdialogCPlayDlg::CPlayDlg(CWnd*pParent/*=NULL*/) :CDialog(CPlayDlg::IDD,pParent){ //{{AFX_DATA_INIT(CPlayDlg) //NOTE:theClassWizardwilladdmemberinitializationhere //}}AFX_DATA_INIT //NotethatLoadIcondoesnotrequireasubsequentDestroyIconinWin32 m_hIcon=AfxGetApp()->LoadIcon(IDR_MAINFRAME);}voidCPlayDlg::DoDataExchange(CDataExchange*pDX){ CDialog::DoDataExchange(pDX); //{{AFX_DATA_MAP(CPlayDlg) //NOTE:theClassWizardwilladdDDXandDDVcallshere //}}AFX_DATA_MAP}BEGIN_MESSAGE_MAP(CPlayDlg,CDialog) //{{AFX_MSG_MAP(CPlayDlg) ON_WM_PAINT() ON_WM_QUERYDRAGICON() ON_BN_CLICKED(IDC_BUTTON_STOP,OnButtonStop) ON_BN_CLICKED(IDC_BUTTON_BACK,OnButtonBack) ON_BN_CLICKED(IDC_BUTTON_FORWARD,OnButtonForward) ON_BN_CLICKED(IDC_BUTTON_OPEN,OnButtonOpen) ON_BN_CLICKED(IDC_BUTTON_SAVE,OnButtonSave) ON_BN_CLICKED(IDC_BUTTON_PLAYORPAUSE,OnButtonPlayorpause) ON_BN_CLICKED(IDC_BUTTON_RECORDORPAUSE,OnButtonRecordorpause) //}}AFX_MSG_MAP ON_MESSAGE(MM_MCINOTIFY,MciNotify)END_MESSAGE_MAP()///////////////////////////////////////////////////////////////////////////////CPlayDlgmessagehandlersBOOLCPlayDlg::OnInitDialog(){ CDialog::OnInitDialog(); //Settheiconforthisdialog.Theframeworkdoesthisautomatically //whentheapplication'smainwindowisnotadialog SetIcon(m_hIcon,TRUE); //Setbigicon SetIcon(m_hIcon,FALSE); //Setsmallicon //TODO:Addextrainitializationhere m_Ready=FALSE; m_PSign=FALSE; //初始化正在播放标识 m_ASign=FALSE; //初始化正在暂停标识 m_MCIDeviceID=0; //初始化设备标识 returnTRUE;//returnTRUEunlessyousetthefocustoacontrol}//Ifyouaddaminimizebuttontoyourdialog,youwillneedthecodebelow//todrawtheicon.ForMFCapplicationsusingthedocument/viewmodel,//thisisautomaticallydoneforyoubytheframework.voidCPlayDlg::OnPaint(){ if(IsIconic()) { CPaintDCdc(this);//devicecontextforpainting SendMessage(WM_ICONERASEBKGND,(WPARAM)dc.GetSafeHdc(),0); //Centericoninclientrectangle intcxIcon=GetSystemMetrics(SM_CXICON); intcyIcon=GetSystemMetrics(SM_CYICON); CRectrect; GetClientRect(&rect); intx=(rect.Width()-cxIcon+1)/2; inty=(rect.Height()-cyIcon+1)/2; //Drawtheicon dc.DrawIcon(x,y,m_hIcon); } else { CDialog::OnPaint(); }}//Thesystemcallsthistoobtainthecursortodisplaywhiletheuserdrags//theminimizedwindow.HCURSORCPlayDlg::OnQueryDragIcon(){ return(HCURSOR)m_hIcon;}//添加的Notify消息处理LRESULTCPlayDlg::MciNotify(WPARAMwParam,LPARAMlParam){ if(wParam==MCI_NOTIFY_SUCCESSFUL)//成功播放完成后重置标识 { m_Ready=TRUE; m_PSign=FALSE;//设置正在播放标识为FALSE m_ASign=FALSE;//设置正在暂停标识为FALSE mciSendCommand(m_MCIDeviceID,MCI_SEEK,MCI_SEEK_TO_START|MCI_WAIT,NULL); GetDlgItem(IDC_BUTTON_STOP)->EnableWindow(false); SetDlgItemText(IDC_BUTTON_PLAYORPAUSE,"播放"); return0; } return-1;//否则返回错误}voidCPlayDlg::OnButtonPlayorpause(){ //TODO:Addyourcontrolnotificationhandlercodehere if(m_Ready){//文件准备好 if(!m_PSign)//没有音乐播放时 OnButtonPlay(); else //有音乐播放 PauseOrContinue(); GetDlgItem(IDC_BUTTON_BACK)->EnableWindow(true); GetDlgItem(IDC_BUTTON_FORWARD)->EnableWindow(true); } else MessageBox("音乐文件没准备好！！！");}voidCPlayDlg::OnButtonPlay(){ //TODO:Addyourcontrolnotificationhandlercodehere MCI_OPEN_PARMSmciplay; mciplay.dwCallback=(long)GetSafeHwnd(); dwError=mciSendCommand(m_MCIDeviceID,MCI_SEEK,MCI_SEEK_TO_START,NULL); if(dwError) { if(mciGetErrorString(dwError,(LPSTR)szErrorBuf,80)) MessageBox(szErrorBuf,"MCI出错",MB_ICONWARNING); else MessageBox("不明错误标识","MCI出错",MB_ICONWARNING); return; } dwError=mciSendCommand(m_MCIDeviceID,MCI_PLAY,MCI_NOTIFY,(DWORD)(LPVOID)&mciplay); if(dwError) { if(mciGetErrorString(dwError,(LPSTR)szErrorBuf,80)) MessageBox(szErrorBuf,"MCI出错",MB_ICONWARNING); else MessageBox("不明错误标识","MCI出错",MB_ICONWARNING); return; } m_PSign=true;//设置正在播放标识为TRUE m_ASign=false; SetDlgItemText(IDC_BUTTON_PLAYORPAUSE,"暂停"); GetDlgItem(IDC_BUTTON_STOP)->EnableWindow(true); MCI_STATUS_PARMSstatusParms; statusParms.dwItem=MCI_STATUS_LENGTH; mciSendCommand(m_MCIDeviceID, MCI_STATUS, MCI_STATUS_ITEM|MCI_WAIT, (DWORD)(LPVOID)&statusParms ); dwLength=statusParms.dwReturn;}voidCPlayDlg::OnButtonStop(){ //停止播放 dwError=mciSendCommand(m_MCIDeviceID,MCI_STOP,MCI_WAIT,NULL); if(dwError) { if(mciGetErrorString(dwError,(LPSTR)szErrorBuf,MAXERRORLENGTH)) MessageBox(szErrorBuf,"MCI出错",MB_ICONWARNING); else MessageBox("不明错误标识","MCI出错",MB_ICONWARNING); return; } mciSendCommand(m_MCIDeviceID,MCI_SEEK,MCI_SEEK_TO_START|MCI_WAIT,NULL); m_PSign=FALSE; //设置正在播放标识为FALSE m_ASign=FALSE; //设置正在暂停标识为FALSE GetDlgItem(IDC_BUTTON_STOP)->EnableWindow(false); GetDlgItem(IDC_BUTTON_BACK)->EnableWindow(false); GetDlgItem(IDC_BUTTON_FORWARD)->EnableWindow(false); SetDlgItemText(IDC_BUTTON_PLAYORPAUSE,"播放");}voidCPlayDlg::OnButtonBack(){ //TODO:Addyourcontrolnotificationhandlercodehere MCI_STATUS_PARMSstatusParms; MCI_PLAY_PARMSplayParms; statusParms.dwItem=MCI_STATUS_POSITION; mciSendCommand(m_MCIDeviceID, MCI_STATUS, MCI_STATUS_ITEM, (DWORD)(LPVOID)&statusParms );dwCurrentPos=statusParms.dwReturn; if(dwCurrentPos<=(dwLength/10)){mciSendCommand(m_MCIDeviceID,MCI_SEEK,MCI_SEEK_TO_END,NULL);mciSendCommand(m_MCIDeviceID,MCI_PLAY,0,(DWORD)(LPVOID)&playParms);}else{ playParms.dwFrom=dwCurrentPos-(DWORD)(dwLength/10);mciSendCommand(m_MCIDeviceID, MCI_PLAY, MCI_FROM, (DWORD)(LPVOID)&playParms); }}voidCPlayDlg::OnButtonForward(){ //TODO:Addyourcontrolnotificationhandlercodehere if(m_PSign){//只有又文件播放时时才可以快进,跳转到文件末尾 MCI_STATUS_PARMSstatusParms; MCI_PLAY_PARMSplayParms; statusParms.dwItem=MCI_STATUS_POSITION; mciSendCommand(m_MCIDeviceID, MCI_STATUS, MCI_STATUS_ITEM, (DWORD)(LPVOID)&statusParms );dwCurrentPos=statusParms.dwReturn; if((dwLength-dwCurrentPos)<=(dwLength/10)){mciSendCommand(m_MCIDeviceID,MCI_SEEK,MCI_SEEK_TO_END,NULL);mciSendCommand(m_MCIDeviceID,MCI_PLAY,0,(DWORD)(LPVOID)&playParms);}else{ playParms.dwFrom=dwCurrentPos+(DWORD)(dwLength/10);mciSendCommand(m_MCIDeviceID, MCI_PLAY, MCI_FROM, (DWORD)(LPVOID)&playParms); } }}voidCPlayDlg::OnButtonOpen()//仅仅打开文件，得到文件的基本信息{ //TODO:Addyourcontrolnotificationhandlercodehere staticcharszFilter[]="波形音频文件(*.wav)|*.wav|MIDI序列(*.mid)|*.mid||"; CFileDialogdlg(TRUE,NULL,NULL,OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT,szFilter); if(dlg.DoModal()==IDOK) { fileext=dlg.GetFileExt(); //获取打开的文件扩展名 m_strBBSFilePath=dlg.GetPathName(); if(m_PSign) //如果程序正在播放，则关闭 { dwError=mciSendCommand(m_MCIDeviceID,MCI_STOP,MCI_WAIT,NULL);//关闭文件 if(dwError) { if(mciGetErrorString(dwError,(LPSTR)szErrorBuf,MAXERRORLENGTH)) MessageBox(szErrorBuf,"MCI出错",MB_ICONWARNING); else MessageBox("不明错误标识","MCI出错",MB_ICONWARNING); return; } dwError=mciSendCommand(m_MCIDeviceID,MCI_CLOSE,0,NULL);//关闭正在播放的声音 if(dwError) //如果关闭不成功，则显示出错的原因 { if(mciGetErrorString(dwError,(LPSTR)szErrorBuf,MAXERRORLENGTH)) MessageBox(szErrorBuf,"MCI出错",MB_ICONWARNING); else MessageBox("不明错误标识","MCI出错",MB_ICONWARNING);//给出相应报告 return; } SetDlgItemText(IDC_BUTTON_PLAYORPAUSE,"播放"); } MCI_OPEN_PARMSmciOpenParms;//定义结构体变量用来存储打开文件的信息和返回的设备标识信息 //没有声音正在播放，则获取打开文件的后辍，并根据后辍决定相应的打开类型 if(!strcmp("wav",fileext)) //当后辍为wav时 mciOpenParms.lpstrDeviceType="waveaudio"; elseif(!strcmp("mid",fileext))//当后辍为mid时 mciOpenParms.lpstrDeviceType="sequencer"; mciOpenParms.lpstrElementName=m_strBBSFilePath.GetBuffer(m_strBBSFilePath.GetLength()); //将打开的文件名存入mciOpenParms结构体中 dwError=mciSendCommand(0,MCI_OPEN,MCI_OPEN_TYPE|MCI_OPEN_ELEMENT,(DWORD)(LPVOID)&mciOpenParms); //发送打开文件命令，MCI_OPEN_TYPE参数说明设备类型名包含在mciOpenParms结构体中， //MCI_OPEN_ELEMENT参数说明要打开的文件名包含在mciOpenParams结构体中 if(dwError)//如果打开不成功，则显示出错的原因 { if(mciGetErrorString(dwError,(LPSTR)szErrorBuf,MAXERRORLENGTH)) MessageBox(szErrorBuf,"MCI出错",MB_ICONWARNING); else MessageBox("不明错误标识","MCI出错",MB_ICONWARNING); return; } m_MCIDeviceID=mciOpenParms.wDeviceID;//将获取的设备ID值赋给全局变量m_MCIDeviceID m_Ready=TRUE;//文件已准备好 m_PSign=FALSE;//设置正在播放标识为FALSE m_ASign=FALSE;//设置正在暂停标识为FALSE GetDlgItem(IDC_BUTTON_STOP)->EnableWindow(false); GetDlgItem(IDC_BUTTON_PLAYORPAUSE)->EnableWindow(true); //GetDlgItem(IDC_BUTTON_BACK)->EnableWindow(false); //GetDlgItem(IDC_BUTTON_FORWARD)->EnableWindow(false); GetDlgItem(IDC_BUTTON_RECORDORPAUSE)->EnableWindow(true); SetDlgItemText(IDC_EDIT1,m_strBBSFilePath); }}voidCPlayDlg::OnButtonSave(){ //TODO:Addyourcontrolnotificationhandlercodehere CFileDialogdlg(FALSE,NULL,NULL,OFN_ALLOWMULTISELECT,_T("TextFiles(*.txt)|*.txt|AllFiles(*.*)|*.*||"),AfxGetMainWnd()); if(dlg.DoModal()==IDOK) { CStringm_strBBSFilePath=dlg.GetPathName(); SetDlgItemText(IDC_EDIT1,m_strBBSFilePath); } //保存功能要自己写————这里只得到保存的路径}voidCPlayDlg::PauseOrContinue(){ //TODO:Addyourcontrolnotificationhandlercodehere if(!m_ASign)//音乐正在播放时 { dwError=mciSendCommand(m_MCIDeviceID,MCI_PAUSE,0,NULL); //则暂停播放 if(dwError) { if(mciGetErrorString(dwError,(LPSTR)szErrorBuf,MAXERRORLENGTH)) MessageBox(szErrorBuf,"MCI出错",MB_ICONWARNING); else MessageBox("不明错误标识","MCI出错",MB_ICONWARNING); return; } m_ASign=TRUE; //设置正在暂停标识为TRUE SetDlgItemText(IDC_BUTTON_PLAYORPAUSE,"播放"); } else//音乐暂停时 { dwError=mciSendCommand(m_MCIDeviceID,MCI_RESUME,0,NULL); //则继续播放 if(dwError) { if(mciGetErrorString(dwError,(LPSTR)szErrorBuf,MAXERRORLENGTH)) MessageBox(szErrorBuf,"MCI出错",MB_ICONWARNING); else MessageBox("不明错误标识","MCI出错",MB_ICONWARNING); return; } m_ASign=FALSE; //设置正在暂停标识为false SetDlgItemText(IDC_BUTTON_PLAYORPAUSE,"暂停"); }}voidCPlayDlg::OnButtonRecordorpause(){ //TODO:Addyourcontrolnotificationhandlercodehere GetDlgItem(IDC_BUTTON_STOP)->EnableWindow(false); GetDlgItem(IDC_BUTTON_OPEN)->EnableWindow(false); GetDlgItem(IDC_BUTTON_PLAYORPAUSE)->EnableWindow(false); GetDlgItem(IDC_BUTTON_BACK)->EnableWindow(false); GetDlgItem(IDC_BUTTON_FORWARD)->EnableWindow(false); GetDlgItem(IDC_BUTTON_RECORDORPAUSE)->EnableWindow(false); if(m_PSign) //如果程序正在播放，则关闭 { dwError=mciSendCommand(m_MCIDeviceID,MCI_STOP,MCI_WAIT,NULL);//关闭文件 if(dwError) { if(mciGetErrorString(dwError,(LPSTR)szErrorBuf,MAXERRORLENGTH)) MessageBox(szErrorBuf,"MCI出错",MB_ICONWARNING); else MessageBox("不明错误标识","MCI出错",MB_ICONWARNING); return; } dwError=mciSendCommand(m_MCIDeviceID,MCI_CLOSE,0,NULL);//关闭正在播放的声音 if(dwError) //如果关闭不成功，则显示出错的原因 { if(mciGetErrorString(dwError,(LPSTR)szErrorBuf,MAXERRORLENGTH)) MessageBox(szErrorBuf,"MCI出错",MB_ICONWARNING); else MessageBox("不明错误标识","MCI出错",MB_ICONWARNING);//给出相应报告 return; } SetDlgItemText(IDC_BUTTON_PLAYORPAUSE,"播放"); } m_PSign=FALSE; m_ASign=FALSE; MCI_OPEN_PARMSmciOpenParms; MCI_RECORD_PARMSmciRecordParms; MCI_SAVE_PARMSmciSaveParms; MCI_PLAY_PARMSmciPlayParms; //用新文件打开波形声音，以进行录音 mciOpenParms.lpstrDeviceType="waveaudio"; mciOpenParms.lpstrElementName=""; if(dwError=mciSendCommand(0,MCI_OPEN,MCI_OPEN_ELEMENT|MCI_OPEN_TYPE,(DWORD)(LPVOID)&mciOpenParms)) { //打开设备失败，返回错误码 return; } //打开设备成功，获取设备ID m_MCIDeviceID=mciOpenParms.wDeviceID; //按指定的时间（ms）长度开始录音，等待录音结束再继续执行程序 //设备的时间格式应设为ms mciRecordParms.dwTo=(DWORD)5*1000; if(dwError=mciSendCommand(m_MCIDeviceID,MCI_RECORD,MCI_TO|MCI_WAIT,(DWORD)(LPVOID)&mciRecordParms)) { mciSendCommand(m_MCIDeviceID,MCI_