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);