wfDrv.wFormatTag = WAVE_FORMAT_GSM610;
        wfDrv.nChannels = 1;
        wfDrv.nSamplesPerSec = 8000;
        wfDrv.nAvgBytesPerSec = 1625;
        wfDrv.nBlockAlign = 65;
        wfDrv.wBitsPerSample = 0;
        wfDrv.cbSize = 2;