[alsa-devel] POSIX clocks and ALSA

Jaroslav Kysela perex at perex.cz
Mon Nov 26 08:49:35 CET 2007

On Mon, 26 Nov 2007, Heikki Lindholm wrote:

> Hello,
> Some years ago there was some talk about UST support in Linux, but the 
> support never happened. With the hrtimers patch (and I'm not quite sure 
> if even earlier?) CLOCK_MONOTONIC would seem like a fairly good UST time 
> source. What I'd like to see, is a selectable clock for ALSA 
> timestamping, e.g. something like snd_sw_params_clock(..., clockid_t 
> clk). Would this seem plausible? I don't know that much about ALSA 
> internals, so, no idea whether different clocks on different 
> pcms/whatever would quickly turn into an unmanageable mess.

We are aware about this extension and I already proposed an 
implementation. I hope to implement it soon. Timestamps are not used in 
driver internally.


Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project

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