using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using NAudio;


namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {

        NAudio.Wave.WaveFormat mAudioFormat = new NAudio.Wave.WaveFormat(8000, 8, 1);
        NAudio.Wave.DirectSoundOut mAudioSPK;


        public Form1()
        {
            InitializeComponent();


            MojBufor mMojBuf = new MojBufor();
            mAudioSPK = new NAudio.Wave.DirectSoundOut();
            mAudioSPK.Init(mMojBuf);

            mAudioSPK.Play();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }


    }
    public class MojBufor : NAudio.Wave.IWaveProvider
    {
        double mPhase = 0.0;
        double mDP1HZ = 2 * Math.PI / 8000;

        int mSampleCnt = 0;

        public NAudio.Wave.WaveFormat WaveFormat
        {
            get { return new NAudio.Wave.WaveFormat(8000, 8, 1); }

        }

        double[] Freq = {880, 987.77, 523.25, 587.33, 659.26, 698.46, 783.99};
        double[] Time = { 250.0, 80.0, 125.0 };
        double xd = 2000;

        public int Read(byte[] aBuf, int aOffset, int aCnt)
        {
            for (int i = 0; i < aCnt; i++)
            {
                aBuf[i] = (byte)(((Math.Sin(mPhase) + 1.0) / 2.0) * 255.0);

                if (mSampleCnt < xd)
                {
                    mPhase += Freq[4] * mDP1HZ;
                    xd += Time[1] ;
                }
                else if (mSampleCnt < xd)
                {
                    xd += Time[1];
                }
                else if (mSampleCnt < xd)
                {
                    mPhase += Freq[4] * mDP1HZ;
                    xd += Time[1] ;
                }
                else if (mSampleCnt < xd)
                {
                    xd += Time[1];
                }
                else if (mSampleCnt < xd)
                {
                    mPhase += Freq[4] * mDP1HZ;
                    xd += Time[1];
                }
                else if (mSampleCnt < xd)
                {
                    xd += Time[1];
                }
                else if (mSampleCnt < xd)
                {
                    mPhase += Freq[6] * mDP1HZ;
                    xd += Time[1];
                }
                else
                {
                    mSampleCnt = 0;
                }
            }
                return aCnt;

        }
    }
}