Работа со звуком

void __stdcall MyAudioStreamCallback(UINT32 Channel,CONST FLOAT *Buffer,CONST FLOAT *BufferFiltered,UINT32 NumberOfSamples,DWORD_PTR UserData)
{
 CONST FLOAT *Input;
 WAVEHDR *WaveHdr;
 SHORT *Output;
 
    //alocate memory for waveout audio buffer and WAVEHDR structure
    WaveHdr=(WAVEHDR*)VirtualAlloc(NULL,sizeof(WAVEHDR)+NumberOfSamples*sizeof(SHORT),MEM_COMMIT,PAGE_READWRITE);
 
    ZeroMemory(WaveHdr,sizeof(WAVEHDR));
 
    WaveHdr->lpData=(LPSTR)(WaveHdr+1); //audio buffer starts after WAVEHDR structure
    WaveHdr->dwBufferLength=NumberOfSamples*sizeof(SHORT);
 
    //retype Buffer to INT32, because bits per sample of DDC type 1 (specified by SetDDCType) is 32 - signed
    Input=(CONST FLOAT*)Buffer;
 
    //retype audio buffer ptr to signed 16bit
    Output=(SHORT*)WaveHdr->lpData;
 
    //convert samples from 32bit IEEE float to 16bit integer
    while(NumberOfSamples--)
    {
        *Output++=(SHORT)((*Input++)*32767.0);
    }
 
    waveOutPrepareHeader(hWaveOut,WaveHdr,sizeof(WAVEHDR));
 
    //increase number of buffers sent to waveout
    BufferCount++;
 
    if(waveOutWrite(hWaveOut,WaveHdr,sizeof(WAVEHDR))!=MMSYSERR_NOERROR)
    {
        //decrease number of buffers sent to waveout because an error
        BufferCount--;
        VirtualFree(WaveHdr,0,MEM_RELEASE);
    }
}