From: Clemens Ladisch <clemens@ladisch.de>
To: cee1 <fykcee1@gmail.com>
Cc: alsa-devel@alsa-project.org
Subject: Re: Question about dmix?
Date: Mon, 22 Mar 2010 09:03:48 +0100 [thread overview]
Message-ID: <4BA72464.3050900@ladisch.de> (raw)
In-Reply-To: <4df68b71003200705j36e71a8aicf9c44fb7f104c27@mail.gmail.com>
cee1 wrote:
> I know alsa support userspace software multi-playback by dmix plugin.
> How does it realize? I expected a daemon accepting multi-streams which
> then mixes these streams to a single one -- it seems not the case.
The kernel maps the device's DMA buffer into all userspace processes;
the processes then cooperate in adding samples to the buffer.
Regards,
Clemens
prev parent reply other threads:[~2010-03-22 8:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-20 14:05 Question about dmix? cee1
2010-03-20 14:27 ` Colin Guthrie
2010-03-21 1:58 ` cee1
2010-03-22 8:03 ` Clemens Ladisch [this message]
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