Reimplementation of logarithmic volume

[Dwscdv3]

Related issue #1703

All features mentioned in that issue are implemented.

Added

• Logarithmic peak meter
• dB value on label instead of percent
• Adjustable logarithmic slider range (current default: 40 dB, range 12 to 96 dB)
  • This is meant to be calibrated by the user to their barely audible level
• Hot reload internal and UI state when certain settings are changed

Changed

• Now uses logarithmic API for device volume, because SetMasterVolumeScalar is non-linear and we will get wrong result if we treat it as linear then compute log value based on it. Sessions are still work with linear API since they only have a linear API.
• Changed some view models' Volume field from int to float.

Notes

• Channels don't automatically get muted when slider is at the minimum, this is by design, not a bug, since it's still a non-zero value.

Known Problems

• Added UseLogarithmicVolumeChanged event handlers to various classes, but this may cause memory leak in AudioDeviceSession because that class don't have any clean up mechanism. (Finalizers won't work)
• Slider value may occasionally flash to 0 (max) when dragging in logarithmic mode, actual volume is unaffected by this.
• A TextBlock is yet to be localized.

[CLAassistant]

All committers have signed the CLA.

[Dwscdv3]

Oops, I accidentally messed up App.xaml.cs, gonna revert it

[Dwscdv3]

By the way, I think the Chinese translation of the switch should be “使用对数比例音量条” or “用对数比例表示音量” rather than “使用对数音量缩放”

The min dB setting may be called “对数比例音量条的最低分贝”

[riverar]

Looks pretty great(!), just some minor things. I'll test it out and have some feedback on text for loc.

[Dwscdv3]

Thanks for your appreciation! I didn't test it out thoroughly though and there might still be some intermittent bugs.

[riverar]

This doesn't feel natural at all; perhaps change IsDirectionReversed to False?

Also, it should remain disabled if the option is not enabled to reinforce they are linked together.

[Dwscdv3]

I was thinking of this slider as the volume range so I made it reversed but… the color is also reversed. I'm considering whether to un-reverse it or just change the label to range instead of min dB. How do you think?

[riverar]

Your choice, but the color needs to be flipped so it matches everyone's expectations of that slider control.