Continuous record and play audio in C# visual studio

Question

I have been trying to record and play the audio simultaneously with out using a temporary wav file. And later I would like to create a VOIP chat program.

I have used the Naudio library to capture and play audio in C# and it seems to work quite well. below is the c # code that i have written:

using System.IO.Ports;
using NAudio.Wave;
using System.IO;

namespace VOIP
{
    public partial class Form1 : Form
    {
        WaveIn wab = new WaveIn();    
        MemoryStream s;        
        int k;


        public Form1()
        {
            InitializeComponent();
            wab.BufferMilliseconds = 100;
            wab.NumberOfBuffers=5;
            wab.DataAvailable += new EventHandler<WaveInEventArgs>(wa_DataAvailable);           
        }

        void wa_DataAvailable(object sender, WaveInEventArgs e)
        {                 

            Play(e.Buffer);         

        }

        private void Play(byte[] p)
        {
            WaveOut ou = new WaveOut();
            s = new MemoryStream(p);
            RawSourceWaveStream r = new RawSourceWaveStream(s, wab.WaveFormat);
            ou.Init(r);
            ou.Play();
            ou.Stop();
            ou.Dispose();
            s.Dispose();
            r.Dispose();

        }

        private void Form1_Load(object sender, EventArgs e)
        {


        }

        private void button1_Click(object sender, EventArgs e)
        {
           if (button1.Text == "Stop")
            {
                wab.StopRecording();
                button1.Text = "Record";
            }
           else if (button1.Text == "Record")
            {
                wab.StartRecording();
                button1.Text = "Stop";
            }            
        }


    }
}

The Problem is at the "Play" method .Since the waveout object is created and disposed every time the data is available : i can hear some clicking sound. Is there a way to avoid this way of creating and disposing object and instead just create one object and then initialize with the new data. I also observed that the memory consumed by this program keeps increasing.

Thanks in advance. sanatan

Answer 1

Use a BufferedWaveProvider, and as audio arrives, decompress it and add it to the BufferedWaveProvider. Then have a single instance of WaveOut that is playing constantly from the BufferedWaveProvider.

The source code for NAudioDemo shows how to do this in the chat example.