Re: Using hardware timers for the ALSA sequencer

[Manuel Jander <manuel.jander@usm.cl>]

Hi,

At least the aureal vortex has a high resolution hardware timer too. So
if this leads to some code to support hardware timers, i would suggest
something useable for other hardware too.

Best Regards

Manuel J. 

On Mon, 2005-03-14 at 19:07 -0500, Lee Revell wrote:
> Hey,
> 
> The emu10k1 timer thread reminded me of an idea I had.
> 
> Currently the ALSA sequencer always uses the system timer by default.
> If your sound cards timer is supported by ALSA (emu10k1 and ymfpci),
> this provides 50-100x better resolution.  But in order to get the ALSA
> sequencer to use it you have to use the seq_default_timer_*  options
> (which BTW I had never heard of on the list, I stumbled across them
> reading the source).
> 
> How hard would it be to get the sequencer to prefer the hardware timer
> by default and fall back to the system timer otherwise?  Probably would
> not be noticeable for a MIDI keyboard, but for applications like sending
> MIDI clock/MTC, the system timer resolution can be inadequate.
> 
> Would this be a good idea?
> 
> Lee
> 
> 
> 
> 
> 
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-- 
Manuel Jander
Electronic Engineer



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