All of lore.kernel.org
 help / color / mirror / Atom feed
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



_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

             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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1240946186.6657.8.camel@trex \
    --to=claus@ilginnis.de \
    --cc=alsa-devel@alsa-project.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.