C#でWin32APIを使ってPCM(WAVE)を再生するには？

unsafe private void button1_Click(object sender, EventArgs e)
{
    //波形生成
    long t;
    short* wave_data = stackalloc short[44100];
    for (t = 0; t < 44100; t++)
    {
        //方形波生成
        if ((t % 200) < 100) *(wave_data + t) = 32767;
        else *(wave_data + t) = -32767;
    }

    //WAVEデバイス設定
    WAVEFORMATEX wf = new WAVEFORMATEX();
    wf.wFormatTag = 0x0001;     //PCM
    wf.nChannels = 1;           //モノラル
    wf.nSamplesPerSec = 44100;  //周波数
    wf.wBitsPerSample = 16;     //16bit
    wf.nBlockAlign = (ushort)(wf.nChannels * wf.wBitsPerSample / 8);
    wf.nAvgBytesPerSec = wf.nSamplesPerSec * wf.nBlockAlign;
    wf.cbSize = 0;
    HWAVEOUT__ hwo = new HWAVEOUT__();
    HWAVEOUT__* hWOut = &hwo;
    windows.waveOutOpen(&hWOut, 0x0001, &wf, 0, 0, 0x0000);

    //WAVE情報設定
    wavehdr_tag wt = new wavehdr_tag();
    wt.lpData = (sbyte*)wave_data;
    wt.dwBufferLength = sizeof(short) * 44100;
    wt.dwFlags = 0;             //バッファの追加情報
    wt.dwLoops = 1;             //１回再生
    wt.dwBytesRecorded = 0;     //録音用
    wt.dwUser = 0;              //オプションのユーザ領域
    wt.lpNext = null;           //使用しない
    wt.reserved = 0;            //使用しない

    //再生
    windows.waveOutPrepareHeader(hWOut, &wt, (uint)sizeof(wavehdr_tag));
    windows.waveOutWrite(hWOut, &wt, (uint)sizeof(wavehdr_tag));
    MessageBox.Show("OK", "確認", MessageBoxButtons.OK);
    windows.waveOutClose(hWOut);
}