On Wednesday 17 Dec 2003 3:13 pm, Jaroslav Kysela wrote:
> Thanks for insigh to the problem. Can you try the attached patch?
Yes, that's a success. Thank you. It's still not absolutely perfect,
but it's significantly better than the original version. I've seen
one slippage (of about 40ms, und
On Mon, 15 Dec 2003, Chris Cannam wrote:
> On Monday 15 Dec 2003 9:16 am, Chris Cannam wrote:
> > This seems to suggest that the default system-based timer is doing
> > something a bit naive, like assuming it was called back on time
> > without actually checking.
>
> Hmm yes, even this crappy lit
On Monday 15 Dec 2003 9:16 am, Chris Cannam wrote:
> This seems to suggest that the default system-based timer is doing
> something a bit naive, like assuming it was called back on time
> without actually checking.
Hmm yes, even this crappy little patch to alsa-kernel/core/timer.c
(gross adjustme
On Monday 15 Dec 2003 1:30 am, Pedro Lopez-Cabanillas wrote:
> The ALSA MIDI sequencer can use several timer sources. By default,
> it uses the Linux system timer functions [...]
> Other timer sources are PCM devices and the RTC timer.
Ah... so that puts Jan's comment into perspective. I could ha
Chris Cannam wrote:
> While trying to track down the source of some poor timing in
> sequencing, I've noticed that my ALSA sequencer queue timer has a
> tendency to fall suddenly behind.
>
> I have a little test program (available on request) that just starts a
> queue and every second or so compar
On Sun, 2003-12-14 at 06:48, Chris Cannam wrote:
> On Sunday 14 Dec 2003 2:34 pm, Chris Cannam wrote:
> > On Sunday 14 Dec 2003 2:02 pm, Jan Depner wrote:
> > > If I'm not mistaken the timing for your audio is coming from your
> > > sound card not your system clock.
> >
> > [...]
> > I mentally rul
On Sunday 14 Dec 2003 2:34 pm, Chris Cannam wrote:
> On Sunday 14 Dec 2003 2:02 pm, Jan Depner wrote:
> > If I'm not mistaken the timing for your audio is coming from your
> > sound card not your system clock.
>
> [...] what if you have more
> than one soundcard or no soundcard at all
And of cours
Multiple soundcards usually have to use word clock or some proprietary
method of syncing the cards. Usually one card will be the master and
the others slaves. I know you can put up to 4 ST Audio DSP24 cards in
one system and set one up as master. I believe the same is true for the
M-Audio Delta
On Sunday 14 Dec 2003 2:34 pm, Chris Cannam wrote:
> On Sunday 14 Dec 2003 2:02 pm, Jan Depner wrote:
> > If I'm not mistaken the timing for your audio is coming from your
> > sound card not your system clock.
>
> [...]
> I mentally ruled out a hardware problem quite early on because I
> wasn't see
On Sunday 14 Dec 2003 2:02 pm, Jan Depner wrote:
> If I'm not mistaken the timing for your audio is coming from your
> sound card not your system clock.
Is that so? Obvious though it is, that simply hadn't occurred to me.
I mentally ruled out a hardware problem quite early on because I
wasn't s
If I'm not mistaken the timing for your audio is coming from your sound
card not your system clock. The gettimeofday is from the system clock.
They probably won't match. Of course, I could be totally in the dark
;-)
Jan
On Sun, 2003-12-14 at 08:07, Chris Cannam wrote:
>
> While trying to tra
While trying to track down the source of some poor timing in
sequencing, I've noticed that my ALSA sequencer queue timer has a
tendency to fall suddenly behind.
I have a little test program (available on request) that just starts a
queue and every second or so compares the queue timer against
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