[.net] DirectSound C# Generate White Noise / Single tone?

using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using Microsoft.DirectX.DirectSound;namespace Noisey{	/// <summary>	/// Very simple test form	/// </summary>	public class MainForm : System.Windows.Forms.Form	{		private System.Windows.Forms.Button buttonWhiteNoise;		/// <summary>		/// Required designer variable.		/// </summary>		private System.ComponentModel.Container components = null;		Device applicationDevice;		public MainForm()		{			//			// Required for Windows Form Designer support			//			InitializeComponent();			//			// Add any constructor code after InitializeComponent call			//			applicationDevice = new Device();			applicationDevice.SetCooperativeLevel(this, CooperativeLevel.Normal);		}		/// <summary>		/// Clean up any resources being used.		/// </summary>		protected override void Dispose( bool disposing )		{			if( disposing )			{				if (components != null) 				{					components.Dispose();				}			}			base.Dispose( disposing );		}		#region Windows Form Designer generated code		/// <summary>		/// Required method for Designer support - do not modify		/// the contents of this method with the code editor.		/// </summary>		private void InitializeComponent()		{			this.buttonWhiteNoise = new System.Windows.Forms.Button();			this.SuspendLayout();			// 			// buttonWhiteNoise			// 			this.buttonWhiteNoise.Location = new System.Drawing.Point(168, 48);			this.buttonWhiteNoise.Name = "buttonWhiteNoise";			this.buttonWhiteNoise.Size = new System.Drawing.Size(104, 23);			this.buttonWhiteNoise.TabIndex = 0;			this.buttonWhiteNoise.Text = "WhiteNoise";			this.buttonWhiteNoise.Click += new System.EventHandler(this.buttonWhiteNoise_Click);			// 			// MainForm			// 			this.AutoScaleBaseSize = new System.Drawing.Size(6, 15);			this.ClientSize = new System.Drawing.Size(292, 260);			this.Controls.Add(this.buttonWhiteNoise);			this.Name = "MainForm";			this.Text = "Noisey";			this.ResumeLayout(false);		}		#endregion		/// <summary>		/// The main entry point for the application.		/// </summary>		[STAThread]		static void Main() 		{			Application.Run(new MainForm());		}		private void buttonWhiteNoise_Click(object sender, System.EventArgs e)		{			WaveFormat format = new WaveFormat();         			format.BitsPerSample = 8;         			format.Channels = 1;         			format.BlockAlign = 1;         			format.FormatTag = WaveFormatTag.Pcm;         			format.SamplesPerSecond = 8000; //sampling frequency of your data;   			format.AverageBytesPerSecond = format.SamplesPerSecond * format.BlockAlign;         			// buffer description         			BufferDescription desc = new BufferDescription(format);			desc.DeferLocation = true;			desc.BufferBytes = 3 * format.AverageBytesPerSecond;                        			// create the buffer         			//Device ApplicationDevice = new Device();						SecondaryBuffer secondaryBuffer = new SecondaryBuffer(desc,applicationDevice);      			//generate ramdom data (white noise)			byte[] rawsamples = new byte[22050];			Random rnd1 = new System.Random();      			for (int i = 0; i < 22050; i++)			{				//-----------------------------------------------				//Completely random				//add a new audio sample to array				rawsamples = (byte) rnd1.Next(255);				//-----------------------------------------------				//-----------------------------------------------				//-- Sine wave? (comment out for white noise)				int convert = (int) ( Math.Sin(i) * Math.PI );				for(int index=0; index<2; index++)				{					i+=index;					rawsamples = (byte)(convert >> (index*8));				}				//-----------------------------------------------			}      			//load audio samples to secondary buffer			secondaryBuffer.Write(0,rawsamples, LockFlag.EntireBuffer);      			//play audio buffer						secondaryBuffer.Play(0,BufferPlayFlags.Default);				}	}}

long DataLength = 40000; //0xD9B4;long SampleRate = 0x5622; //samples per second.int Channels = 1;int BitsPerSample = 8;int BytesPerSample = (BitsPerSample / 8) * Channels;long BytesPerSec = SampleRate * BytesPerSample;long length = DataLength + 36; //4+24+8Capture c = new Capture();         CaptureBufferDescription cpd = new CaptureBufferDescription();cpd.BufferBytes = 40000;WaveFormat fmt = new WaveFormat();fmt.AverageBytesPerSecond = (int)BytesPerSec;fmt.BitsPerSample = (short)BitsPerSample;fmt.Channels = (short)Channels;fmt.SamplesPerSecond = (int)SampleRate;fmt.BlockAlign = 1;fmt.FormatTag = WaveFormatTag.Pcm;         cpd.Format = fmt;CaptureBuffer cb = new CaptureBuffer(cpd,c);cb.Start(false);int pos=0;int pos1=0;while(pos < 39999){   cb.GetCurrentPosition(out pos,out pos1);}cb.Stop();byte[] mybuff = new byte[40000];MemoryStream mystream = new MemoryStream(mybuff,0,40000,true,true);cb.Read(0,mystream,40000,LockFlag.None);Random rnd = new Random((int)(new DateTime()).Date.Ticks);byte[] initialsound = new byte[length+8];char[] headerdata = {'R','I','F','F',                           (char)(length & 0xFF),                           (char)(length >> 8 & 0xFF),                           (char)(length >> 16 & 0xFF),                           (char)(length >> 24 & 0xFF),                           'W','A','V','E','f','m','t',' ',                           (char)0x10,(char)0,(char)0,(char)0,(char)0x01,(char)0x00,                           (char)(Channels & 0xFF), (char)(Channels >> 8 & 0xFF),                           (char)(SampleRate & 0xFF),                           (char)(SampleRate >> 8 & 0xFF),                           (char)(SampleRate >> 16 & 0xFF),                           (char)(SampleRate >> 24 & 0xFF),                           (char)(BytesPerSec & 0xFF),                           (char)(BytesPerSec >> 8 & 0xFF),                           (char)(BytesPerSec >> 16 & 0xFF),                           (char)(BytesPerSec >> 24 & 0xFF),                           (char)(BytesPerSample & 0xFF), (char)(BytesPerSample >> 8 & 0xFF),                           (char)(BitsPerSample & 0xFF), (char)(BitsPerSample >> 8 & 0xFF),                           'd','a','t','a',                           (char)(DataLength & 0xFF),                           (char)(DataLength >> 8 & 0xFF),                           (char)(DataLength >> 16 & 0xFF),                           (char)(DataLength >> 24 & 0xFF)};//copy the header data to the sound byte array.for(int i=0;i<44;i++){   initialsound = (byte)headerdata;}for(int i =44;i<DataLength+44;i+=2){             initialsound = mybuff[i-44];} MemoryStream mystream1 = new MemoryStream(initialsound,0,(int)(DataLength+44),true,true);         snd = new SecondaryBuffer(mystream1,ApplicationDevice);snd.Play(0,BufferPlayFlags.Looping); 

namespace GarboDev{    using System;    using System.Threading;    using System.Windows.Forms;    using Microsoft.DirectX.DirectSound;    public delegate void PullAudio(short[] buffer, int length);    public class SoundPlayer : IDisposable    {        private Device soundDevice;        private SecondaryBuffer soundBuffer;        private int samplesPerUpdate;        private AutoResetEvent[] fillEvent = new AutoResetEvent[2];        private Thread thread;        private PullAudio pullAudio;        private short channels;        private bool halted;        private bool running;        public SoundPlayer(Control owner, PullAudio pullAudio, short channels)        {            this.channels = channels;            this.pullAudio = pullAudio;            this.soundDevice = new Device();            this.soundDevice.SetCooperativeLevel(owner, CooperativeLevel.Priority);            // Set up our wave format to 44,100Hz, with 16 bit resolution            WaveFormat wf = new WaveFormat();            wf.FormatTag = WaveFormatTag.Pcm;            wf.SamplesPerSecond = 44100;            wf.BitsPerSample = 16;            wf.Channels = channels;            wf.BlockAlign = (short)(wf.Channels * wf.BitsPerSample / 8);            wf.AverageBytesPerSecond = wf.SamplesPerSecond * wf.BlockAlign;            this.samplesPerUpdate = 512;            // Create a buffer with 2 seconds of sample data            BufferDescription bufferDesc = new BufferDescription(wf);            bufferDesc.BufferBytes = this.samplesPerUpdate * wf.BlockAlign * 2;            bufferDesc.ControlPositionNotify = true;            bufferDesc.GlobalFocus = true;            this.soundBuffer = new SecondaryBuffer(bufferDesc, this.soundDevice);            Notify notify = new Notify(this.soundBuffer);            fillEvent[0] = new AutoResetEvent(false);            fillEvent[1] = new AutoResetEvent(false);            // Set up two notification events, one at halfway, and one at the end of the buffer            BufferPositionNotify[] posNotify = new BufferPositionNotify[2];            posNotify[0] = new BufferPositionNotify();            posNotify[0].Offset = bufferDesc.BufferBytes / 2 - 1;            posNotify[0].EventNotifyHandle = fillEvent[0].Handle;            posNotify[1] = new BufferPositionNotify();            posNotify[1].Offset = bufferDesc.BufferBytes - 1;            posNotify[1].EventNotifyHandle = fillEvent[1].Handle;            notify.SetNotificationPositions(posNotify);            this.thread = new Thread(new ThreadStart(SoundPlayback));            this.thread.Priority = ThreadPriority.Highest;            this.Pause();            this.running = true;            this.thread.Start();        }        public void Pause()        {            if (this.halted) return;            this.halted = true;            Monitor.Enter(this.thread);        }        public void Resume()        {            if (!this.halted) return;            this.halted = false;            Monitor.Pulse(this.thread);            Monitor.Exit(this.thread);        }        private void SoundPlayback()        {            lock (this.thread)            {                if (!this.running) return;                // Set up the initial sound buffer to be the full length                int bufferLength = this.samplesPerUpdate * 2 * this.channels;                short[] soundData = new short[bufferLength];                // Prime it with the first x seconds of data                this.pullAudio(soundData, soundData.Length);                this.soundBuffer.Write(0, soundData, LockFlag.None);                // Start it playing                this.soundBuffer.Play(0, BufferPlayFlags.Looping);                int lastWritten = 0;                while (this.running)                {                    if (this.halted)                    {                        Monitor.Pulse(this.thread);                        Monitor.Wait(this.thread);                    }                    // Wait on one of the notification events                    WaitHandle.WaitAny(this.fillEvent, 3, true);                    // Get the current play position (divide by two because we are using 16 bit samples)                    int tmp = this.soundBuffer.PlayPosition / 2;                    // Generate new sounds from lastWritten to tmp in the sound buffer                    if (tmp == lastWritten)                    {                        continue;                    }                    else                    {                        soundData = new short[(tmp - lastWritten + bufferLength) % bufferLength];                    }                    this.pullAudio(soundData, soundData.Length);                    // Write in the generated data                    soundBuffer.Write(lastWritten * 2, soundData, LockFlag.None);                    // Save the position we were at                    lastWritten = tmp;                }            }        }        public void Dispose()        {            this.running = false;            this.Resume();            if (this.soundBuffer != null)            {                this.soundBuffer.Dispose();            }            if (this.soundDevice != null)            {                this.soundDevice.Dispose();            }        }    }}