WIN32音频数据采集---WaveIn-Out实现

   基本步骤及思想：设定音频采集参数（采样率、声道等），打开音频设备和开辟缓存，操作采集的数据。
1．  定义音频采集参数

 

WAVEFORMATEX waveform;//WAVE波形的采集参数

typedef struct {

    WORD  wFormatTag;

    WORD  nChannels;

    DWORD nSamplesPerSec;

    DWORD nAvgBytesPerSec;

    WORD  nBlockAlign;

    WORD  wBitsPerSample;

    WORD  cbSize;

} WAVEFORMATEX;

 

waveform.wFormatTag=WAVE_FORMAT_PCM;

  waveform.nChannels=1;             //声道设为1

  waveform.nSamplesPerSec=11025;   //采样率11025

  waveform.nAvgBytesPerSec=11025;

  waveform.nBlockAlign=1;

  waveform.wBitsPerSample=8;        //数据位设为8位

  waveform.cbSize=0;

 

PWAVEHDR pWaveHdr1,pWaveHdr2; //WAVE波形的头信息

2．  打开音频采集设备并开辟缓存

 

if (waveInOpen(&hWaveIn,WAVE_MAPPER,&waveform,(DWORD)this->m_hWnd,NULL,CALLBACK_WINDOW)) {   //打开设备

     free(pBuffer1);

     free(pBuffer2);

     MessageBeep(MB_ICONEXCLAMATION);

     AfxMessageBox("Audio can not be open!");

}

pWaveHdr1->lpData=(LPTSTR)pBuffer1;

pWaveHdr1->dwBufferLength=INP_BUFFER_SIZE;

pWaveHdr1->dwBytesRecorded=0;

pWaveHdr1->dwUser=0;

pWaveHdr1->dwFlags=0;

pWaveHdr1->dwLoops=1;

pWaveHdr1->lpNext=NULL;

pWaveHdr1->reserved=0;

waveInPrepareHeader(hWaveIn,pWaveHdr1,sizeof(WAVEHDR));

pWaveHdr2->lpData=(LPTSTR)pBuffer2;

pWaveHdr2->dwBufferLength=INP_BUFFER_SIZE;

pWaveHdr2->dwBytesRecorded=0;

pWaveHdr2->dwUser=0;

pWaveHdr2->dwFlags=0;

pWaveHdr2->dwLoops=1;

pWaveHdr2->lpNext=NULL;

pWaveHdr2->reserved=0;

waveInPrepareHeader(hWaveIn,pWaveHdr2,sizeof(WAVEHDR));

//////////////////////////////////////////////////////////////////////////

pSaveBuffer = (PBYTE)realloc (pSaveBuffer, 1) ;

// Add the buffers

waveInAddBuffer (hWaveIn, pWaveHdr1, sizeof (WAVEHDR)) ;

waveInAddBuffer (hWaveIn, pWaveHdr2, sizeof (WAVEHDR)) ;

3．  操作采集的音频数据

 

在WAVEIN中有如下几个消息

MM_WOM_OPEN    //设备的打开

MM_WIM_DATA    //设备数据的采集及操作

MM_WIM_CLOSE   //设备的关闭

 

void CRecordHWndDlg::OnMM_WIM_DATA(UINT wParam, LONG lParam)

{

// TODO: Add your message handler code here and/or call default

// Reallocate save buffer memory

//////////////////////////////////////////////////////////////////////////

pNewBuffer = (PBYTE)realloc (pSaveBuffer, dwDataLength +

     ((PWAVEHDR) lParam)->dwBytesRecorded) ;

if (pNewBuffer == NULL)

{

     waveInClose (hWaveIn) ;

     MessageBeep (MB_ICONEXCLAMATION) ;

     AfxMessageBox("erro memory");

     return ;

}

pSaveBuffer = pNewBuffer ;

//////////////////////////////////////////////////////////////////////////

CopyMemory (pSaveBuffer + dwDataLength, ((PWAVEHDR) lParam)->lpData,

     ((PWAVEHDR) lParam)->dwBytesRecorded) ;

dwDataLength += ((PWAVEHDR) lParam)->dwBytesRecorded ;

if (bEnding)

{

     waveInClose (hWaveIn) ;

     return ;

}

 

CFile file;

file.Open("data.txt",CFile::modeWrite|CFile::modeCreate);

file.Write(pSaveBuffer,dwDataLength);

file.Close();

 

// Send out a new buffer

waveInAddBuffer (hWaveIn, (PWAVEHDR) lParam, sizeof (WAVEHDR)) ;

TRACE("done input data\n");

return ;

 

}

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