public void BeginFadeOut(double fadeDurationInMilliseconds)
{
object obj = this.lockObject;
lock (obj)
{
this.fadeSamplePosition = 0;
this.fadeSampleCount = (int)(fadeDurationInMilliseconds * (double)this.source.WaveFormat.SampleRate / 1000.0);
this.fadeState = FadeInOutSampleProvider.FadeState.FadingOut;
}
}
private void FadeIn(float[] buffer, int offset, int sourceSamplesRead)
{
int i = 0;
while (i < sourceSamplesRead)
{
float num = (float)this.fadeSamplePosition / (float)this.fadeSampleCount;
for (int j = 0; j < this.source.WaveFormat.Channels; j++)
{
buffer[offset + i++] *= num;
}
this.fadeSamplePosition++;
if (this.fadeSamplePosition > this.fadeSampleCount)
{
this.fadeState = FadeInOutSampleProvider.FadeState.FullVolume;
return;
}
}
}
private void FadeOut(float[] buffer, int offset, int sourceSamplesRead)
{
int i = 0;
while (i < sourceSamplesRead)
{
float num = 1f - (float)this.fadeSamplePosition / (float)this.fadeSampleCount;
for (int j = 0; j < this.source.WaveFormat.Channels; j++)
{
buffer[offset + i++] *= num;
}
this.fadeSamplePosition++;
if (this.fadeSamplePosition > this.fadeSampleCount)
{
this.fadeState = FadeInOutSampleProvider.FadeState.Silence;
FadeInOutSampleProvider.ClearBuffer(buffer, i + offset, sourceSamplesRead - i);
return;
}
}
}
public FadeInOutSampleProvider(ISampleProvider source, bool initiallySilent = false)
{
this.source = source;
this.fadeState = (initiallySilent ? FadeInOutSampleProvider.FadeState.Silence : FadeInOutSampleProvider.FadeState.FullVolume);
}