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Add perceptual volume adjustment

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The perceived loudness change of a change in volume depends
on the listening volume: at high volumes a 1 dB increment is
noticeable, but at low volumes a larger increment is needed
to get a comparable change in loudness.

Perceptual volume adjustment accounts for this fact, and
divides the hardware volume range into a number of steps.
Each step changes the dB volume by a variable amount, with
most of the steps concentrated at higher volumes. This
makes it possible to sweep over the entire hardware volume
range quickly, without losing the ability to finely adjust
the volume at normal listening levels.

Use "Volume Adjustment Mode" in the system settings menu
to select perceptual volume mode. The number of steps used
is controlled by "Number of Volume Steps". (Number of steps
has no effect in direct adjustment mode.)

It's still possible to set a specific dB volume level from
the sound settings menu when perceptual volume is enabled,
and perceptual volume does not affect the volume displayed
by themes.

Change-Id: I6f91fd3f7c5e2d323a914e47b5653033e92b4b3b
This commit is contained in:
Aidan MacDonald 2022-11-22 04:10:35 +00:00
parent 15c4447b66
commit 5b27e2255a
17 changed files with 240 additions and 35 deletions
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53
apps/lang/english.lang
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@ -15163,7 +15163,7 @@
</phrase>
<phrase>
id: LANG_DIRECT
desc: in the pictureflow settings
desc: in the pictureflow settings, also a volume adjustment mode
user: core
<source>
*: "Direct"
@ -16559,3 +16559,54 @@
*: "Play Last Shuffled"
</voice>
</phrase>
<phrase>
id: LANG_VOLUME_ADJUST_MODE
desc: in system settings
user: core
<source>
*: none
perceptual_volume: "Volume Adjustment Mode"
</source>
<dest>
*: none
perceptual_volume: "Volume Adjustment Mode"
</dest>
<voice>
*: none
perceptual_volume: "Volume Adjustment Mode"
</voice>
</phrase>
<phrase>
id: LANG_VOLUME_ADJUST_NORM_STEPS
desc: in system settings
user: core
<source>
*: none
perceptual_volume: "Number of Volume Steps"
</source>
<dest>
*: none
perceptual_volume: "Number of Volume Steps"
</dest>
<voice>
*: none
perceptual_volume: "Number of Volume Steps"
</voice>
</phrase>
<phrase>
id: LANG_PERCEPTUAL
desc: in system settings -> volume adjustment mode
user: core
<source>
*: none
perceptual_volume: "Perceptual"
</source>
<dest>
*: none
perceptual_volume: "Perceptual"
</dest>
<voice>
*: none
perceptual_volume: "Perceptual"
</voice>
</phrase>