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using System;
using Microsoft.DirectX.DirectSound;


    public class Class1
    {
        private const int SAMPLES = 8;
        private int[] SAMPLE_FORMAT_ARRAY = { SAMPLES, 2, 1 };
        private CaptureDevicesCollection audioDevices;
        //private static int deviceIndex = 0;
        private Microsoft.DirectX.DirectSound.CaptureBuffer buffer;
        //private static double last = 0;
        private DevicesCollection dc = new DevicesCollection();
        private Capture cap = new Capture();
        private CaptureBufferDescription desc = new CaptureBufferDescription();
        private WaveFormat wf = new WaveFormat();
        private Array samples;

        public void initsound()
        {
            dc = new DevicesCollection();
            audioDevices = new CaptureDevicesCollection();

            cap = new Capture(audioDevices[0].DriverGuid);

            desc = new CaptureBufferDescription();
            wf = new WaveFormat();
            wf.BitsPerSample = 16;
            wf.SamplesPerSecond = 44100;
            wf.Channels = 2;
            wf.BlockAlign = (short)(wf.Channels * wf.BitsPerSample / 8);
            wf.AverageBytesPerSecond = wf.BlockAlign * wf.SamplesPerSecond;
            wf.FormatTag = WaveFormatTag.Pcm;

            desc.Format = wf;
            desc.BufferBytes = SAMPLES * wf.BlockAlign;

            buffer = new Microsoft.DirectX.DirectSound.CaptureBuffer(desc, cap);
            buffer.Start(true);
        }

        public int tickme()
        {
            try
            {
                int average = 0;

                samples = buffer.Read(0, typeof(Int16), LockFlag.FromWriteCursor, SAMPLE_FORMAT_ARRAY);

                for (int i = 0; i < SAMPLES; i++)
                {
                    average += (Int16)samples.GetValue(i, 0, 0);
                }

                double am = Math.Max((average / SAMPLES) / 10, 0);
                return (int)am;
            }
            catch
            {
                return 0;
            }
        }

    }