Re: mixer callback - help needed

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At Tue, 27 Jun 2006 20:22:04 +0200,
Christophe Osuna wrote:
> 
> Hi,
> 
> I am trying to implement a simple mixer. Changing volume is fine but I
> am stuck with the callback for mixer events.
> 
> I couldn't find lots of documentation, so I have tried to mimic what
> is done in alsamixer. However I must have missed something because it
> does not work. I only call snd_mixer_set_callback; it seems it is not
> enough but what else is needed?
> 
> Below is a program just to show what I am trying to do. Could anyone
> give me hand with this?

You need to call snd_mixer_handle_events() to trigger callbacks.

Usually you wait via poll() or select() (with pollfd parameters
returned from snd_mixer_poll_descriptors()) then call
snd_mixer_handle_events().


Takashi

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