[Bug 753304] pulsesink: volume does not appear to be linear; violates playbin contract

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753304

--- Comment #7 from Arun Raghavan <arun at accosted.net> ---
Created attachment 310963
  --> https://bugzilla.gnome.org/attachment.cgi?id=310963&action=edit
pulse: Make volume property behave in a linear fashion

The volume property on our elements is supposed to apply as a purely
linear function, and the application should use the GstStreamVolume
interface to apply a cubic mapping to a UI slider if required.

Using pa_sw_volume_to/from_linear() does not work as this performs a
cubic mapping under the hood, which is not what we want.

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