explain of a class.

Question

Hi,
Is someone can help me what is the role of this class:

 public class MeteringStream : WaveStream

    {

        public WaveStream SourceStream { get; private set; }

        public int SamplesPerNotification { get; set; }

        float[] maxSamples;

        int sampleCount;

        public event EventHandler<StreamVolumeEventArgs> StreamVolume;

         MeteringStream(WaveStream sourceStream) :

            this(sourceStream, sourceStream.WaveFormat.SampleRate / 10)

       {

        }

        public MeteringStream(WaveStream sourceStream, int samplesPerNotification)

        {

            SourceStream = sourceStream;

            if (sourceStream.WaveFormat.BitsPerSample != 32)

                throw new ArgumentException("Metering Stream expects 32 bit floating point audio", "sourceStream");

            maxSamples = new float[sourceStream.WaveFormat.Channels];

            this.SamplesPerNotification = samplesPerNotification;

        }

        public override WaveFormat WaveFormat

        {

            get { return SourceStream.WaveFormat; }

        }

        public override long Length

        {

            get { return SourceStream.Length; }

        }

        public override long Position

        {

            get { return SourceStream.Position; }

            set { SourceStream.Position = value; }

        }

        public override int Read(byte[] buffer, int offset, int count)

        {

            int bytesRead = SourceStream.Read(buffer, offset, count);

            ProcessData(buffer, offset, bytesRead);

            return bytesRead;

        }

        private void ProcessData(byte[] buffer, int offset, int count)

        {

            int index = 0;

            while (index < count)

            {

                for (int channel = 0; channel < maxSamples.Length; channel++)

                {

                    float sampleValue = Math.Abs(BitConverter.ToSingle(buffer, offset + index));

                    maxSamples[channel] = Math.Max(maxSamples[channel], sampleValue);

                    index += 4;

                }

                sampleCount++;

                if (sampleCount >= SamplesPerNotification)

                {

                    RaiseStreamVolumeNotification();

                    sampleCount = 0;

                    Array.Clear(maxSamples, 0, maxSamples.Length);

                }

            }

        }

        private void RaiseStreamVolumeNotification()

        {

            if (StreamVolume != null)

            {

                StreamVolume(this, new StreamVolumeEventArgs() { MaxSampleValues = (float[])maxSamples.Clone() });

            }

        }

    }

    public class StreamVolumeEventArgs : EventArgs

    {

        public float[] MaxSampleValues { get; set; }

    }

and the internal class StreamVolumeEventArgs : EventArgs
Thanks in advance.