From: Clemens Ladisch <clemens@ladisch.de>
To: Adrian Knoth <adi@drcomp.erfurt.thur.de>
Cc: alsa-devel@alsa-project.org,
Andre Schramm <andre.schramm@iosono-sound.com>
Subject: Re: Complex hw buffer with MMAP_COMPLEX?
Date: Tue, 09 Oct 2012 15:49:32 +0200 [thread overview]
Message-ID: <50742B6C.9080601@ladisch.de> (raw)
In-Reply-To: <50742405.9070201@drcomp.erfurt.thur.de>
Adrian Knoth wrote:
> That is, we're dealing with 25 (or 26 for output) interleaved streams
> with two or eight channels each.
>
> How could we represent such a layout in ALSA, that is, how are we
> talking to userspace? Would one create subdevices and rejoin them via
> plughw?
Is it possible to start/stop the streams independently?
If yes, this might be useful.
(And subdevices are usually used for streams that are mixed together.)
> Or use MMAP_COMPLEX and then let every application deal with it
> on its own?
Alsa-lib can automatically convert this. Applications that insist
on using hw devices have to deal with it (Jack does).
Regards,
Clemens
next prev parent reply other threads:[~2012-10-09 13:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-09 13:17 Complex hw buffer with MMAP_COMPLEX? Adrian Knoth
2012-10-09 13:49 ` Clemens Ladisch [this message]
2012-10-09 14:09 ` Adrian Knoth
2012-10-09 14:19 ` Takashi Iwai
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