What are the "plugins" in alsa-plugins useful for?

What are the "plugins" in alsa-plugins useful for?

[Thomas Hood]

What are the "plugins" in alsa-plugins actually useful for?

-- 
Thomas Hood <jdthood@yahoo.co.uk>



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Re: What are the "plugins" in alsa-plugins useful for?

[Takashi Iwai]

At Sun, 27 Mar 2005 10:23:37 +0200,
Thomas Hood wrote:
> 
> What are the "plugins" in alsa-plugins actually useful for?

I don't understand the question quite well...
Do you mean the purposes of plugins included in alsa-plugins package?

If yes:  The jack plugin was formerly in alsa-lib.  The oss plugin is
the plugin to emulate ALSA API on OSS drivers.

READMEs are missing there...


Takashi


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Re: What are the "plugins" in alsa-plugins useful for?

[Thomas Hood]

On Tue, 2005-03-29 at 16:31 +0200, Takashi Iwai wrote:
> Do you mean the purposes of plugins included in alsa-plugins package?
> 
> If yes:  The jack plugin was formerly in alsa-lib.


Yes, but what does this plugin do?  Does it allow jackd to be used as if
it were a device?  I.e.,

   application with ALSA output -> libasound -> jack

?

I assume so because jackd has its own plugin for sending output to ALSA
(i.e., in the opposite direction).


> The oss plugin is the plugin to emulate ALSA API on OSS drivers.


I.e.,

   application with ALSA output -> libasound -> OSS device

?


Second, how does one use these plugins?  Can you provide an
example .asoundrc file?

-- 
Thomas Hood <jdthood@yahoo.co.uk>



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Re: What are the "plugins" in alsa-plugins useful for?

[Takashi Iwai]

At Tue, 29 Mar 2005 17:25:11 +0200,
Thomas Hood wrote:
> 
> On Tue, 2005-03-29 at 16:31 +0200, Takashi Iwai wrote:
> > Do you mean the purposes of plugins included in alsa-plugins package?
> > 
> > If yes:  The jack plugin was formerly in alsa-lib.
> 
> 
> Yes, but what does this plugin do?  Does it allow jackd to be used as if
> it were a device?  I.e.,
> 
>    application with ALSA output -> libasound -> jack
> 
> ?

Yes.  And vice versa for capture.


> I assume so because jackd has its own plugin for sending output to ALSA
> (i.e., in the opposite direction).
> 
> 
> > The oss plugin is the plugin to emulate ALSA API on OSS drivers.
> 
> 
> I.e.,
> 
>    application with ALSA output -> libasound -> OSS device
> 
> ?

Yes, exactly.

> Second, how does one use these plugins?  Can you provide an
> example .asoundrc file?

Specify "jack" or "oss" pcm type after installing these plugins.
For example,

pcm.jack {
	type jack
	playback_ports {
		0 alsa_pcm:playback_1
		1 alsa_pcm:playback_1
	}
}

pcm.oss {
	type oss
	device /dev/dsp
}


Then use like

	% aplay -Dplug:jack foo.wav


Takashi


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