[linux-audio-dev] ALSA Picture

Richard Spindler richard.spindler at gmail.com
Fri Mar 24 08:30:48 EST 2006


2006/3/24, Clemens Ladisch <clemens at ladisch.de>:
> snd_pcm_hw_params() goes into the SETUP state and then calls
> snd_pcm_prepare(); I don't know how to display this in a picture. :)

Yes, I read that, but from an App-Developers point of view, this is
roughly equivalent to going to PREPARE directly, IMHO.

> You probably want an arrow from snd_pcm_writei() to RUNNING.

Fixed that. :)

> The SUSPENDED and XRUN states can happen asynchronously, i.e., the
> device can go into them at any time (from some other states), and the
> next call to snd_pcm_writei() only reports them.  In this regard, they
> are similar to the DISCONNECTED state.

Is this an issue when using this async-stuff? I think the most likely
situation might be that it happens when you call writei.

> XRUN happens not only when an over/underrun occurs but also when some
> other error causes the device to stop (this error may be recoverable or
> not).

What could that be?

-Richard


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