Requests: SetVolume: allow volumes > 1.0

[marcan]

Description

Allow volumes > 1.0 / > 0dB, which is legal in OBS (you can do this in Advanced Audio Properties). OBS allows up to +26dB gain, so we do the same. This corresponds to approximately 20x linear gain (actually 19.9526231497, but 20 is easier to explain and OBS doesn't care).

Motivation and Context

This is required to be able to add audio gain to sources that have too low an audio level.

How Has This Been Tested?

A previous version of this patch was tested with OBS master a few months ago, and used in production. I've rebased this on the current version, which added the decibel mode. I think the change is obvious enough that it does not warrant further testing.

Types of changes

• Documentation change (a change to documentation pages)
• Enhancement (modification to a current event/request which adds functionality)

Checklist:

• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[marcan]

FWIW this has now been tested in production too.

[tt2468]

Just a note for the future, only the documentation in the source code needs to be updated, as the docs files are automatically generated.