vc中播放mp3文件的方法小结

一般播放MP3常见的有两种方法，一种是自己解码，另外一种用系统的库，比如MCI，当然如果可以用控件直接用个控件会更方便。

1.      使用mci

#include <windows.h>

#include <stdio.h>

#include <mmsystem.h>

#include <shellapi.h>

#include <AFXCOM_.H>

#pragma comment(lib,"winmm.lib")

void main()

{

char str[128]={0};

int i = 0;

char buf[128]={0};

MCI_OPEN_PARMS mciOpen;

MCIERROR mciError;

mciOpen.lpstrDeviceType = "mpegvideo";

mciOpen.lpstrElementName = "c://1.mp3";

mciError = mciSendCommand(0,MCI_OPEN,MCI_OPEN_TYPE | MCI_OPEN_ELEMENT,(DWORD)&mciOpen);

if(mciError)

{

mciGetErrorString(mciError,buf,128);

printf("%s/n",buf);

goto Error;

}

UINT DeviceID = mciOpen.wDeviceID ;

MCI_PLAY_PARMS mciPlay;

mciError = mciSendCommand(DeviceID,MCI_PLAY,0 ,(DWORD)&mciPlay);

if(mciError)

{

printf("send MCI_PLAY command failed/n");

goto Error;

}

//WinExec("sndvol32.exe",SW_SHOWNORMAL);

//这个可以打开音量控制不过可以用编程实现。

while(1)

{

sprintf(str,"播放时间:/t%d",i);

printf("%s/r",str);

i++;

Sleep(1000);

}

Error:

system("pause");

}

2.使用库vfw.h

#include <vfw.h>

#pragma comment(lib,"vfw32.lib")

void CMp3PlayerDlg::OnBnClickedButton1()

{

// TODO: 在此添加控件通知处理程序代码

CString szFilters="MyType Files(*.mp3)|All Files(*.*)|*.*||";

CFileDialog file(TRUE,"mp3","*.mp3",OFN_FILEMUSTEXIST|OFN_HIDEREADONLY,szFilters,this);

if(file.DoModal()==IDOK)

{

CString filename=file.GetFileName();

if(hwnd!=NULL)

{

MCIWndDestroy(hwnd);

}

hwnd=MCIWndCreate(this->m_hWnd,NULL,MCIWNDF_NOPLAYBAR,filename);

::ShowWindow(hwnd,SW_HIDE);

MCIWndSetVolume(hwnd,1000);

MCIWndPlay(hwnd);

}

}

3.使用directshow

#include   <dshow.h>

#pragma comment(lib,"strmiids.lib")

IGraphBuilder*   pGBuilder;

IMediaControl*   pMControl;

IMediaPosition*   pMPos;

IMediaEvent*   pMEvent;

CoInitialize(NULL);   //初始化COM

CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC, IID_IGraphBuilder,(void**)&pGBuilder);

pGBuilder->QueryInterface(IID_IMediaControl,(void**)&pMControl);

pGBuilder->QueryInterface(IID_IMediaEvent,(void**)&pMEvent);

pGBuilder->QueryInterface(IID_IMediaPosition,(void**)&pMPos);

CHAR   strSoundPath[MAX_PATH];   //存储音乐所在路径

WCHAR   wstrSoundPath[MAX_PATH];   //存储UNICODE形式的路径

GetCurrentDirectory(MAX_PATH,   strSoundPath);

strcat(strSoundPath,   "//a.mp3");   //假设要播放的是子目录下的a.mp3

//  MultiByteToWideChar(CP_ACP,   0,   strSoundPath,   -1,wstrSoundPath,   MAX_PATH);

mbstowcs(wstrSoundPath, strSoundPath, MAX_PATH);

pGBuilder->RenderFile(wstrSoundPath,   NULL);   //调入文件

//播放MP3文件

//播放MP3的方法十分简单：

pMPos->put_CurrentPosition(0);   //移动到文件头

pMControl->Run();   //播放

CEdit* pEdit=(CEdit*)GetDlgItem(IDC_EDIT1);

char buf[20];

sprintf(buf,"%f",pos);

pEdit->SetWindowTextA(buf);

// 停止播放和释放对象

//最后，我们要停止播放音乐并释放各个对象：

pMControl->Stop();   //停止播放

pMControl->Release();

pMControl=NULL;

pMEvent->Release();

pMEvent=NULL;

pMPos->Release();

pMPos=NULL;

pGBuilder->Release();

pGBuilder=NULL;

CoUninitialize();   //释放COM

4.使用mci播放MP3

主要变量定义

MCI_OPEN_PARMS mciOpen;

MCIERROR mciError;

MCI_STATUS_PARMS mciStatusParms;

WORD m_wDeviceID;

这里只介绍mciSendCommand命令

1.播放

MCI_PLAY_PARMS mciPlay;

mciOpen.lpstrDeviceType = "mpegvideo";

mciOpen.lpstrElementName =fileName.GetString();

mciError = mciSendCommand(m_wDeviceID,MCI_PLAY,0 ,(DWORD)&mciPlay);

2.暂停

mciSendCommand(mciOpen.wDeviceID,MCI_PAUSE,NULL ,NULL);

3. 停止

mciSendCommand(mciOpen.wDeviceID,MCI_STOP,NULL ,NULL);

mciSendCommand(mciOpen.wDeviceID,MCI_SEEK,MCI_SEEK_TO_START ,NULL);

4.获得播放进度

mciStatusParms.dwItem=MCI_STATUS_POSITION;    mciSendCommand(m_wDeviceID,MCI_STATUS,MCI_WAIT|MCI_STATUS_ITEM,(DWORD)(LPVOID)&mciStatusParms);//关键,取得位置

int m_dPosition=mciStatusParms.dwReturn;

5.获得整个音频的时间长度

UINT DeviceID = mciOpen.wDeviceID ;

mciStatusParms.dwItem=MCI_STATUS_LENGTH; mciSendCommand(DeviceID,MCI_STATUS,MCI_WAIT|MCI_STATUS_ITEM,(DWORD)(LPVOID)&mciStatusParms);//关键,取得长度

m_dLength=mciStatusParms.dwReturn;

6.在指定位置播放

MCI_PLAY_PARMS mciPlay;

mciPlay.dwFrom=m_dPosition;

mciError = mciSendCommand(m_wDeviceID,MCI_PLAY,MCI_FROM,(DWORD)&mciPlay);

7.控制音量

MCI_DGV_SETAUDIO_PARMS mciSetAudioPara;

mciSetAudioPara.dwItem = MCI_DGV_SETAUDIO_VOLUME;

mciSetAudioPara.dwValue = atoi(m_Volume.GetBuffer(m_Volume.GetLength())); //here is the value of the Volume(0--1000)

mciSendCommand(m_wDeviceID, MCI_SETAUDIO, MCI_DGV_SETAUDIO_VALUE | MCI_DGV_SETAUDIO_ITEM, (DWORD)(LPVOID)&mciSetAudioPara);