level meter for alsa

[Lutz Müller-2]

Hello!

I'd like to implement level meters within gnome-volume-control (mock-up
attached). But in order to be able to implement that, the current audio
levels on alsa devices need to be advertised by GStreamer.

alsa-tools uses snd_ctl_elem_read and snd_ctl_elem_value_get_integer to
read the current level on a specific alsa device. I couldn't find a
reference to these functions in gst-plugins-base/ext/alsa.

Can you point me to the right GStreamer element/interface that can be
used by frontends to monitor the audio level on alsa devices (if it
exists)?

Regards

Lutz

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[Stefan Sauer]

hi,

Lutz Müller schrieb:

> Hello!
>
> I'd like to implement level meters within gnome-volume-control (mock-up
> attached). But in order to be able to implement that, the current audio
> levels on alsa devices need to be advertised by GStreamer.
>
> alsa-tools uses snd_ctl_elem_read and snd_ctl_elem_value_get_integer to
> read the current level on a specific alsa device. I couldn't find a
> reference to these functions in gst-plugins-base/ext/alsa.
>
> Can you point me to the right GStreamer element/interface that can be
> used by frontends to monitor the audio level on alsa devices (if it
> exists)?

IMHO it would require extending the GstMixer. I would like to see this feature,
as it helps to see on which channel something is happening.

Stefan

>
> Regards
>
> Lutz
>
>
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[Lutz Müller-2]

On Thu, 2008-01-10 at 21:06 +0200, Stefan Kost wrote:
> Lutz Müller schrieb:
> > I'd like to implement level meters within gnome-volume-control (mock-up
> > attached). But in order to be able to implement that, the current audio
> > levels on alsa devices need to be advertised by GStreamer.
> >
> IMHO it would require extending the GstMixer. I would like to see this feature,
> as it helps to see on which channel something is happening.

I just opened a feature request:
http://bugzilla.gnome.org/show_bug.cgi?id=510654

Regards

Lutz


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