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Add a LinearVolume wrapper for mediaElement.Volume (#834)

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Co-authored-by: Frank Becker <frank.becker@thoughtexchange.com>
This commit is contained in:
Frank Becker
2021-02-22 12:10:36 -08:00
committed by GitHub
parent 36e9d97509
commit 7377b4f2ab
2 changed files with 34 additions and 9 deletions
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39
QuickLook.Plugin/QuickLook.Plugin.VideoViewer/ViewerPanel.xaml.cs
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@@ -145,7 +145,7 @@ namespace QuickLook.Plugin.VideoViewer
public void Dispose()
{
// old plugin use an int-typed "Volume" config key ranged from 0 to 100. Let's use a new one here.
SettingHelper.Set("VolumeDouble", mediaElement.Volume);
SettingHelper.Set("VolumeDouble", LinearVolume);
SettingHelper.Set("ShouldLoop", ShouldLoop);
try
@@ -280,13 +280,38 @@ namespace QuickLook.Plugin.VideoViewer
: Visibility.Visible;
}
// Newer .net has Math.Clamp
private T Clamp<T>(T val, T min, T max) where T : IComparable<T>
{
if (val.CompareTo(min) < 0) return min;
else if (val.CompareTo(max) > 0) return max;
else return val;
}
// A change in amplitude by a factor of 10 corresponds to a 20 dB change
private const double DecibelAmplitudeMult = 20.0;
public double LinearVolume
{
// mediaElement.Volume returns [0,1] where 0 = -100db, 1 = 0db
// Decibel is logarithmic. See amplitude table https://en.wikipedia.org/wiki/Decibel
get
{
var dbVol = 100.0 * (mediaElement.Volume - 1.0);
var linearVol = Math.Pow(10, dbVol / DecibelAmplitudeMult);
return linearVol;
}
set
{
var linearVol = Clamp(value, 0.00001, 1.0);
var dbVol = DecibelAmplitudeMult * Math.Log10(linearVol);
mediaElement.Volume = dbVol / 100.0 + 1.0;
OnPropertyChanged();
}
}
private void ChangeVolume(double delta)
{
var newVol = mediaElement.Volume + delta;
newVol = Math.Max(newVol, 0);
newVol = Math.Min(newVol, 1);
mediaElement.Volume = newVol;
LinearVolume = LinearVolume + delta; // setter will clamp
}
private void TogglePlayPause(object sender, EventArgs e)
@@ -316,7 +341,7 @@ namespace QuickLook.Plugin.VideoViewer
mediaElement.Source = new Uri(path);
// old plugin use an int-typed "Volume" config key ranged from 0 to 100. Let's use a new one here.
mediaElement.Volume = SettingHelper.Get("VolumeDouble", 1d);
LinearVolume = SettingHelper.Get("VolumeDouble", 1d);
mediaElement.Play();
}