[Freeswitch-users] Portaudio Improvements

[Mitch Capper]

Ah well viewing volume levels had not been something I had looked into.  It
wouldn't be too hard but the question is how do you constantly report that
(FS event every second? every half second? port audio commands to return
that value frequently?).  If your client is windows however again the native
windows volume handler for apps does also keep track of their current
output.

~Mitch

On Sat, Jan 22, 2011 at 5:26 PM, Seven Du <dujinfang at gmail.com> wrote:

> Thanks Mitch, I actually had tried the equivalent uuid_audio and looks
> like it's the only way to do it for now. We had wanted to get energy
> levels dynamically to show a live indication but we given up that
> feature.
>
>
> On Sun, Jan 23, 2011 at 2:52 AM, Mitch Capper <mitch.capper at gmail.com>
> wrote:
> > It is true PA lacks volume control, it had been something I was debating.
> > Adding gain is pretty simple as you are for the most part just
> multiplying
> > up the samples I believe so would not be a major item to add to
> portaudio, I
> > however decided not to go this route for two reasons.  1) In Windows each
> > application has its own volume setting (Vista and higher),  and apps are
> > starting to tie into this than internal volume controls.  The downside is
> it
> > doesn't distort audio/have a gain option.   This is when I thought about
> > allowing for a fixed gain amount added to portaudio.  2) Freeswitch
> actually
> > has its own built in volume control settings with set_audio_level.
> > set_audio_level allows for 9 settings (4 lower 4 higher) and seems to do
> a
> > good job at digital volume control.
> > Avoiding modifying the audio stream itself could also result in less
> > distortion when using actual volume controls (headsets, etc).
> >
> > So if you want volume control I would say take a look at set_audio_level
> as
> > it may be the simplest method.   Adding it to portaudio would work but
> one
> > of the nice advantages of set_audio_level is the fact you can also do it
> per
> > channel rather than globally:)
> >
> > ~Mitch
> >
> > On Fri, Jan 21, 2011 at 5:44 PM, Seven Du <dujinfang at gmail.com> wrote:
> >>
> >> In addition to AEC. I also found PA lacks the ability to change the
> >> sound device volume. I tried to control sound devices in QT but
> >> haven't find a way. Ideas on this?
> >
> >
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>
>
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