[alsa-devel] [PATCH 0/2] RFC: support for audio wall clock

Takashi Iwai tiwai at suse.de
Sat Jul 21 08:20:53 CEST 2012

At Fri, 20 Jul 2012 14:47:24 -0500,
Pierre-Louis Bossart wrote:
> On 7/18/2012 12:10 PM, Takashi Iwai wrote:
> > Sorry for the late reply. I've looked over the things around my 
> > vacation... This version looks better, so if other people have no 
> > objection, I can merge it. The extension of mmap_status seems still 
> > fitting with 64bit char size, so it should be OK. But, one thing -- 
> > can't we reuse the normal tstamp field for the audio wallclock? That 
> > is, add a new tstamp mode, and then put wallclock tstamp there instead 
> > of the normal system tstamp. Just an idea. thanks, Takashi
> Thanks for reviewing the updated patches. No, the audio wall clock needs 
> to come in addition to the regular system tstamp. This is needed for 
> applications such as PulseAudio who try to estimate the drift between 
> system time and audio time. If you remove the system time information, 
> they can't program a timer any longer.
> Better wait a bit to merge, I need to work on all the TODOs, complete 
> some additional validation for corner cases and get your feedback live 
> at LPC.

Alright.  Let's cook a bit longer.


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