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volume: Add LFE balance API

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The gnome/unity-control-center UIs have a master volume slider, and
three sub-sliders: balance, fade, and subwoofer. Balance and fade
use PA's set_balance and set_fade APIs accordingly, but the subwoofer
slider sometimes does unintuitive things.

In order to make that slider behave better, let's add a LFE balance
API that these volume control UIs can use instead. With this API,
the UI can balance between "no subwoofer" and "only subwoofer" with
"equal balance" in the middle, which would make it more consistent
with the behaviour of the other sliders.

BugLink: https://bugzilla.gnome.org/show_bug.cgi?id=753847

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
This commit is contained in:
David Henningsson 2015-10-27 09:54:39 +01:00 • committed by Tanu Kaskinen
parent 387a244cd9
commit 9fecb6eb32
6 changed files with 88 additions and 1 deletions
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8
src/pulsecore/sample-util.h
View file

@ -126,6 +126,14 @@ size_t pa_convert_size(size_t size, const pa_sample_spec *from, const pa_sample_
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_REAR_RIGHT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_TOP_REAR_CENTER))
#define PA_CHANNEL_POSITION_MASK_LFE \
PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_LFE)
#define PA_CHANNEL_POSITION_MASK_HFE \
(PA_CHANNEL_POSITION_MASK_REAR | PA_CHANNEL_POSITION_MASK_FRONT \
| PA_CHANNEL_POSITION_MASK_LEFT | PA_CHANNEL_POSITION_MASK_RIGHT \
| PA_CHANNEL_POSITION_MASK_CENTER)
#define PA_CHANNEL_POSITION_MASK_SIDE_OR_TOP_CENTER \
(PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_SIDE_LEFT) \
| PA_CHANNEL_POSITION_MASK(PA_CHANNEL_POSITION_SIDE_RIGHT) \