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   源码介绍

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PC机声卡直接输出指定频率和指定幅值的正弦波，立体声双通道。可以当作信号发生器。

/////////////////////////////////////////////////////////////////////////////////////////////////////////////
//    Glogal Thread procedure for the CSoundOut class
//    It cannot be included inside the Class
//   
// The LPARAM is the Class pointer it can be the base class CSoundOut
// or a drived class like CFft 
// The value of this parametre can change according because 
//  OpenMic() call a virtual funtion 
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
#define PT_S ((CSoundOut*)pParam) 

UINT WaveOutThreadProc(void * pParam)
{
//   CSoundOut * SoundOut = (class CSoundOut *)pParam;
   UINT result;
   UINT FirstPass = TRUE;


if ( FirstPass)
result = WaitForSingleObject(PT_S->m_WaveOutEvent,INFINITE);
FirstPass = FALSE;
    
while (!PT_S->m_Terminate)
{
result = WaitForSingleObject(PT_S->m_WaveOutEvent,INFINITE);
if ((result == WAIT_OBJECT_0)&&(!PT_S->m_Terminate ))
{
PT_S->AddBuffer();      // Toggle as changed state here !Toggle point to the just received buffer
    PT_S->ComputeSamples(&PT_S->m_Toggle);
}
else
return 0;  // 
}
    return 0;
}

void CSoundOut::AddBuffer()
{

   MMRESULT result;

   if (m_Toggle == 0) 
   m_Toggle = 1; 
   else 
   m_Toggle = 0;
   result = waveOutUnprepareHeader( m_WaveOut, &m_WaveHeader[m_Toggle], sizeof(WAVEHDR) ); 
   if  (result!= MMSYSERR_NOERROR) 
   {
        AfxMessageBox(_T("Sound output Cannot UnPrepareHeader !"));
        return;
   };
  m_SizeRecord = m_NbMaxSamples;
    m_WaveHeader[m_Toggle].lpData = (CHAR *)&OutputBuffer[m_Toggle][0];
    m_WaveHeader[m_Toggle].dwBufferLength = m_SizeRecord *2;
m_WaveHeader[m_Toggle].dwLoops = 0;
m_WaveHeader[m_Toggle].dwFlags = 0; //WHDR_BEGINLOOP ;

    result = waveOutPrepareHeader( m_WaveOut, &m_WaveHeader[m_Toggle], sizeof(WAVEHDR) ); 
   if ( (result!= MMSYSERR_NOERROR) || ( m_WaveHeader[m_Toggle].dwFlags != WHDR_PREPARED) )
        AfxMessageBox(_T("Sound output Cannot Prepare Header !"));

   result = waveOutWrite( m_WaveOut, &m_WaveHeader[m_Toggle], sizeof(WAVEHDR) );
   if  (result!= MMSYSERR_NOERROR) 
        AfxMessageBox(_T("Sound output Cannot Add Buffer !"));

}