Как получить звук от микрофона и записать в WAV формат

#include <iostream>
#include <windows.h>
#include <mmsystem.h>
 
typedef struct {
    char RIFF [4];
    DWORD bytes;
    char WAVE [4];
    char fmt [4];
    int siz_wf;
    WORD wFormatTag;
    WORD nChannels;
    DWORD nSamplesPerSec;
    DWORD nAvgBytesPerSec;
    WORD nBlockAlign;
    WORD wBitsPerSample;
    char data [4];
    DWORD pcmbytes;
} WAVHEADER;
 
int main ()
{
    const int second = 5;
    
    const int SampleRate = 44100;
    const int N = SampleRate * 2 * second;
    short int buffer [N];
    
    WAVEFORMATEX wfex;
    wfex.wFormatTag        = WAVE_FORMAT_PCM;
    wfex.nChannels         = 2;
    wfex.wBitsPerSample    = 16;
    wfex.nSamplesPerSec    = SampleRate;
    wfex.nAvgBytesPerSec   = SampleRate * wfex.nChannels * wfex.wBitsPerSample / 8;
    wfex.nBlockAlign       = wfex.nChannels * wfex.wBitsPerSample / 8;
    wfex.cbSize            = 0;
    
    HWAVEIN hWaveIn;
    waveInOpen (&hWaveIn, WAVE_MAPPER, &wfex, 0L, 0L, WAVE_FORMAT_DIRECT);
    
    WAVEHDR WaveHdr;
    WaveHdr.lpData          = (LPSTR) buffer;
    WaveHdr.dwBufferLength  = N * 2;
    WaveHdr.dwBytesRecorded = 0;
    WaveHdr.dwUser          = 0L;
    WaveHdr.dwFlags         = 0L;
    WaveHdr.dwLoops         = 0L;
    waveInPrepareHeader (hWaveIn, &WaveHdr, sizeof (WAVEHDR));
    waveInAddBuffer (hWaveIn, &WaveHdr, sizeof (WAVEHDR));
    waveInStart (hWaveIn);
    while (waveInUnprepareHeader (hWaveIn, &WaveHdr, sizeof (WAVEHDR)) == WAVERR_STILLPLAYING);
    waveInClose (hWaveIn);
    
    WAVHEADER wh;
    memcpy (wh.RIFF, "RIFF", 4);
    memcpy (wh.WAVE, "WAVE", 4);
    memcpy (wh.fmt, "fmt ", 4);
    memcpy (wh.data, "data", 4);
    wh.siz_wf          = 16;
    wh.wFormatTag      = WAVE_FORMAT_PCM;
    wh.nChannels       = wfex.nChannels;
    wh.wBitsPerSample  = wfex.wBitsPerSample;
    wh.nSamplesPerSec  = SampleRate;
    wh.nAvgBytesPerSec = SampleRate * wh.nChannels * wh.wBitsPerSample / 8;
    wh.nBlockAlign     = wh.nChannels * wh.wBitsPerSample / 8;
    wh.bytes           = N * 2 + 36;
    wh.pcmbytes        = N * 2;
    
    HANDLE hFile = CreateFile ("audio.wav", GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile)
    {
         DWORD dwWrite;
         WriteFile (hFile, &wh, sizeof (WAVHEADER), &dwWrite, NULL);
         WriteFile (hFile, WaveHdr.lpData, WaveHdr.dwBufferLength, &dwWrite, NULL);
         CloseHandle (hFile);
    }
    system ("pause");
    return 0;
}