Subject: Re: [linux-audio-dev] a new application underway
From: Jaroslav Kysela (perex_AT_suse.cz)
Date: pe loka 08 1999 - 09:30:26 EDT
On Fri, 8 Oct 1999 thudson_AT_cygnus.com wrote:
> Paul Barton-Davis wrote:
> > the beauty of the ALSA sequencer is that it offers an extremely
> > generic event router with a timing limit that is not subject to the
> > same limits. Alas, this is a theoretical possibility right now, since
> > even the kernel doesn't check the timer queue more than HZ times a
> > second. However, add the UTIME patch, and the kernel can do flexibly
> > scheduled stuff with microsecond resolution.
> >
> > once you've got the MIDI file, the existence of MIDI playback tools
> > *and* the ALSA sequencer allow anything to become automated *without*
> > any special code: you just add the relevant sequencer port to the list
> > of MIDI ports you select(2) on, and it all works like magic.
> >
> I agree. The ALSA sequencer architecture is one killer feature that
> would make any user have to seriously consider linux over other OSes.
>
> One feature I think would make the ALSA sequencer even more useful would
> be to add a "fake" raw midi interface. That is, an interface that behaved
> like the raw midi interface to the client application, but showed up
> in the list of ALSA sequencer clients that could be routed to other
> applications. It would deliver raw midi events from other clients
> at the right time. As far as the app is concerned it would see them
> as coming in from an external port in real time. This would allow
> legacy apps to participate in the routing architecture and perhaps
> benefit from the enhanced timing *without modification*.
>
> I know this was discussed at one time, was a decision ever made to
> include this?
I'm not against it, if someone create a separate module.
> Or could it be done with a separate alsa kernel client?
Yes, this code can be implemented as a separate alsa kernel client.
Jaroslav
-----
Jaroslav Kysela <perex_AT_suse.cz>
SuSE Linux http://www.suse.com
ALSA project http://www.alsa-project.org
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