Re: [LAD] Timing of the ALSA loop device

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From: Robin Gareus <robin@...>

To: Fons Adriaensen <fons@...>

Cc: Linux Audio Developers <linux-audio-dev@...>

Subject: Re: [LAD] Timing of the ALSA loop device

Date: Wednesday, March 21, 2012 - 1:53 pm

On 03/21/2012 02:32 PM, Fons Adriaensen wrote:

quoted text

> Hello,
>
> Does anyone know what sort of timer is used by the ALSA
> loop device, and if this can be changed in some way ?

It uses the software clock (jiffies). It also has separate timers for
playback and capture and AFAICT it can not be changed.

Maybe you should ask on the alsa-dev list or read for yourself:
http://git.alsa-project.org/?p=alsa-kernel.git;a=blob;f=sound/drivers/al...

> On the system I'm working on now, wakeup times while waiting

quoted text

> for a period to be available (as done by Jack and zita-alsa-pcmi)
> seem to be quantised in steps of 3.3ms or so. Which means it
> sometimes wakes up 3/4 or more of a period too late. Next one
> will be xrun in that case.
>
> Ciao,
>

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Messages in current thread:

[LAD] Timing of the ALSA loop device, Fons Adriaensen, (Wed Mar 21, 1:32 pm)

Re: [LAD] Timing of the ALSA loop device, Robin Gareus, (Wed Mar 21, 1:53 pm)