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From: Claus Ilginnis <Claus@Ilginnis.de>
To: alsa-devel@alsa-project.org
Subject: Detect when sound card is in use
Date: Tue, 28 Apr 2009 21:16:26 +0200	[thread overview]
Message-ID: <1240946186.6657.8.camel@trex> (raw)


Hi everyone,

I have a problem and I dont't know where to ask my questions anymore, so
I hope this mailing list can help me make progress with my problem....

I have a speaker set connected to an USB-Power-Plug (by which I can turn
the speakers on and off )

Now I want to detect, when the soundcard is in use and when not.
(to turn the speakers on when needed...)
(I am a C++ programmer so I can mess some things up)

So my question is:
Which way is best to detect wheather my sound card is in use or not ?
Is there a general overview/documentation of the sound kernel modules
which describes the general relationship between them ?
What would you do ?

PLEASE help !


-  

Mit freundlichen Grüßen / Best regards
Claus Ilginnis



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             reply	other threads:[~2009-04-28 19:16 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-04-28 19:16 Claus Ilginnis [this message]
2009-04-29  6:40 ` Detect when sound card is in use Takashi Iwai
2009-04-29  7:16   ` Clemens Ladisch

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