Re: External PCM plugin SDK

[Takashi Iwai <tiwai@suse.de>]

At Wed, 09 Feb 2005 15:14:18 +0100,
Marcel Holtmann wrote:
> 
> Hi Takashi,
> 
> > I now commited a patch to add the external PCM plugin SDK to
> > alsa-lib.  This allows you to create ALSA PCM plugin outside the
> > alsa-lib tree.  It's still a draft version, and currently only the I/O
> > plugin (e.g. for implementation of user-space driver) is provided.
> > The filter-type plugin SDK (e.g. for effects) and the control plugin
> > SDK will follow later.
> > 
> > No documentation yet.  Look at the code :)
> > 
> > Example I/O plugins are found in alsa-plugins tree.  So far, two
> > plugins, OSS and JACK plugins.  The former one is the plugin to
> > emulate ALSA API with the OSS driver.  The latter is almost identical
> > with the one in alsa-lib/src/pcm/ext.
> > 
> > I think this SDK can be used for better implementaion of BT-SCO and
> > FireWire.
> 
> I wrote a quick and dirty prototype using SBC over RFCOMM for now.

Wow.

>  It is
> working with aplay and the alsaplayer, but not with xmms or beep. Are
> there any known problem with these ALSA plugins?

Which xmms/bmp are you using?
I fixed ALSA plugins of xmms and bmp recently, so it might have been
fixed.  For testing, you can try the one in SUSE's rpms from STABLE.

Do you have buffer or period size constraints?

> We also talked about making these IO plugins visible when ALSA is
> listing its hardware devices. Is this possible now?

No, it's still in planning.
We'll need to define a usable API first...


Takashi


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