[pulseaudio-discuss] RFC: New volume functionality for PulseAudio

[Raymond Yau]

2014-02-13 17:29 GMT+08:00 Tanu Kaskinen <tanu.kaskinen at linux.intel.com>:

> On Thu, 2014-02-13 at 10:35 +0800, Raymond Yau wrote:
> > 2014-02-11 22:03 GMT+08:00 Tanu Kaskinen <tanu.kaskinen at linux.intel.com
> >:
> >
> > > Hi all!
> > >
> > > I'm working (together with other people at Intel) on adding system
> volume
> > > control functionality to Tizen (primarily the IVI profile, although
> there's
> > > nothing inherently IVI specific here). Tizen uses web APIs for the UI,
> and
> > > since there are no existing web API standards for this functionality,
> we
> > > need to design the API from scratch. The current design can be seen at
> [1],
> > > in case you're interested (it's good background material for this
> > > discussion). What I'd like to discuss in this thread, however, is not
> the
> > > web API as such, but the use cases behind that design and what those
> use
> > > cases ultimately require from PulseAudio. (Feedback for the web API
> > > proposal is welcome too, but I think that should be discussed in a
> separate
> > > thread.)
> > >
> > > We want to support:
> > >  * A single main output volume control. Think of things like the Gnome
> > > volume applet: when you click the applet icon, you get a single volume
> > > slider for controlling the "current output", whatever that means. The
> Gnome
> > > volume applet implements the main volume by using the default sink
> volume,
> > > but we'd like to make the main volume contextual, so that the main
> volume
> > > can control different things at different times. Ideally the contextual
> > > logic would be implemented in PulseAudio (by a policy module), not in
> the
> > > volume applet. The volume applet should know when the main volume
> controls
> > > e.g. the headphones volume or the phone call volume.
> > >
> >
> > will it have a mute switch which is independent of the volume similar to
> > those volume controls of HDA codec ?
> >
> > for mobile phone and tablet which only have volume up and volume down,
> the
> > mute is at the minimum of the volume
> >
> > but the mute switch exist for a remote control of TV or settop box or
> > notebook , the volume is unaffected when mute and unmute
>
> You're right, there should be a "main mute" control. I have a mute
> button on my laptop, so I really should have seen this use case...
>
> > There are some codecs which does not have a mute switch independent of
> the
> > volume control and use TLV_DB_SCALE_MUTE
>
> This is not really relevant, because PulseAudio can synthesize a
> software mute control just fine if there's no hardware mute control.
>
>
pulseaudio internally using floating point 0.0 to 1.0 as the scale which is
similar to TLV_DB_SCALE_MUTE since 0.0 is -inf dB


http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths/analog-output-headphones.conf

why do pulseaudio need to turn off speaker volume when it already mute the
speaker playback switch ?

[Element Speaker]
switch = off
volume = off
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