Full duplex mode

Full duplex mode

[Carlos Munoz]

Hi all,

An alsa driver I've written supports full duplex mode (playback and 
capture simultaneously). Do I need to anything special to support full 
duplex mode ? I assume the playback_open(), etc and capture_open(), etc 
will both get called and from the driver point of view I'm just handling 
two streams, right ?

Thanks,


Carlos


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Re: Full duplex mode

[Paul Davis]

On Fri, 2006-04-07 at 19:32 -0700, Carlos Munoz wrote:
> Hi all,
> 
> An alsa driver I've written supports full duplex mode (playback and 
> capture simultaneously). Do I need to anything special to support full 
> duplex mode ? I assume the playback_open(), etc and capture_open(), etc 
> will both get called and from the driver point of view I'm just handling 
> two streams, right ?

more or less correct. it depends on how you intend to manage
synchronization between the two streams within your application.



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Re: Full duplex mode

[Jaroslav Kysela]

On Sat, 8 Apr 2006, Paul Davis wrote:

> On Fri, 2006-04-07 at 19:32 -0700, Carlos Munoz wrote:
> > Hi all,
> > 
> > An alsa driver I've written supports full duplex mode (playback and 
> > capture simultaneously). Do I need to anything special to support full 
> > duplex mode ? I assume the playback_open(), etc and capture_open(), etc 
> > will both get called and from the driver point of view I'm just handling 
> > two streams, right ?
> 
> more or less correct. it depends on how you intend to manage
> synchronization between the two streams within your application.

Note that you can support sample accurate start for both streams (linked 
streams). See pci/ice1712/ice1712.c - snd_ice1712_pro_trigger() for 
example.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SUSE Labs


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