Re: [Lmuse-developer] MIDI playback too fast when using dummyaudio

[Robert J. <rj...@sp...>]

Hi Jonathan,

On Monday 09 May 2005 02:18, Jonathan Woithe wrote:
> > On Thursday 14 Apr 2005 04:20, Jonathan Woithe wrote:
> > > Hi
> > >
> > > This post follows up on a Muse bug report I just filed with a similar
> > > subject.  I have Muse 0.7.1 compiled and run under Slackware 10.0 with
> > > ALSA 1.0.6 and kernel 2.4.25 + lowlatency patches.  When I use muse
> > > "normally", as in
> > >
> > >   muse
> > >
> > > MIDI playback proceeds at whatever tempo the song is set to.  However,
> > > if the dummy audio driver is used, as in
> > >
> > >   muse -a
> > >
> > > the playback of MIDI tracks occurs way too quickly.  For example, a
> > > song set at 115 bpm (which plays at 115 when "-a" isn't used) plays
> > > back at around 180 bpm when "-a" is used.  There are no audio tracks in
> > > the song. Running muse with or without setuid makes no difference.
> > >
> > > I've noticed that there have been some timing-related dummyaudio
> > > commits to CVS in the last month or so, so this issue might have
> > > already been addressed. If not, I'm happy to act as a tester to try to
> > > narrow down the possibilities.
> >
> > You are quite welcome to test the cvs version, there has indeed been
> > changes in this area. The no-audio has known issues, especially with
> > transport support, but I believe the bpm bug has been fixed.
> >
> > Check it out with:
> > cvs -z3 -d:pserver:ano...@cv...:/cvsroot/lmuse co
> > -rREL07 -P muse
>
> I finally got around to testing this.  With a CVS snapshot from 2 May 2005
> taken using the above command, I observed different (but still incorrect
> behaviour).  Starting muse with
>
>   muse -a
>
> the playback speed of sequences is now around 10 times *slower* than it
> should be.  It appears that the timing changes have made a difference but
> that there are still issues lurking somewhere.  Starting muse without "-a"
> makes the timing correct, as one would expect.
>

Are you by any change using a 2.4 kernel? 

I found out that the timer used behaves quite differently (about ten times 
slower) when used under 2.4.

(Oh, I see above that you ARE using 2.4. I'll think about possible ways to fix 
this.)

> One thing which struck me as a bit odd - the splash screen for the CVS
> snapshot had "0.7PRE2" in the top right corner.  The changelog appeared to
> contain entries far more recent than this though, so I'm guessing all was
> ok.

Yes, it was an old mistake that was not remedied until last week.

Regards,
Robert

> Regards
>   jonathan
>
>
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