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 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.
and the internal class StreamVolumeEventArgs : EventArgs
Thanks in advance.
sawass sawassPosted Jun 7, 2011, 3:40 PM
FroglegPosted Jun 7, 2011, 3:35 PM
sawass sawassPosted Jun 7, 2011, 3:25 PM
Guest UserPosted Jun 7, 2011, 3:15 PM
Sorry I can't be of more help.
sawass sawassPosted Jun 7, 2011, 2:31 PM
Guest UserPosted Jun 7, 2011, 1:23 PM
More info here: http://naudio.codeplex.com/