linuxaudio.org

On Mon, 20 Jul 2009 23:03:36 +0000 (GMT)

Frank Kober  wrote:
>

quoted text
> Playing a bit more with it I see that I traded in the disconnections/xruns for crackling when the CPU load goes up a bit, so there was much wishful thinking when I last posted, I also thought it was part of the bug fixes announced... On my system, which is an old mono-proc 2.6 GHz this is actually not so painful, however on a friend's system (bi-proc 1.6 GHz) the crackling already appeared with low-demanding sounds, and in that case it wouldn't useful for doing recordings.

> So let's hope the team finds a solution to this...indeed not much improvement to the most serious problem until now.

> Regards

> Frank

>

> --- En date de : Dim 19.7.09, Atte Andre Jensen  a écrit :

>

> > De: Atte Andre Jensen

> > Objet: Re: [LAU] Heads Up! ZynAddSubFX

> > À:

> > Cc: linux-audio-user@lists.linuxaudio.org

> > Date: Dimanche 19 Juillet 2009, 16h27

> > Folderol wrote:

> >

> > > Paun N has just made a pre-release version 2.4.0

> > available.

> > > Now would be a good time to try it and stress test

> > it!

> >

> > As far as I can see Paul N hasnt't developed anything, just

> > wrapped the

> > new teams changes in a release. Can anyone confirm this?

> >

> > At least there is no mention of the impelmentation of the

> > realtime-safeness we're all waiting for. So it seems

> > performance should

> > be no better/worse than 1 month ago (that is if you've been

> > tracking cvs)...

> >

> > --

> > Atte

This is being very intensively worked on. There is a temporary fix,

which cures the defect completely, but partially returns to the RT

unsafe situation. I found it worth doing, for the sake of all the other

benefits.
In src/Output/JACKaudiooutput.cpp change the folowing lines:

===================================================================

if (!pthread_mutex_trylock(&jackmaster->mutex)) {

    JACKhandlemidi(nframes);
jackmaster->GetAudioOutSamples(nframes,jack_get_sample_rate(jackclient),outl,outr);

    pthread_mutex_unlock(&jackmaster->mutex);

} else {

    memset(outl, 0, sizeof(jack_default_audio_sample_t) * nframes);

    memset(outr, 0, sizeof(jack_default_audio_sample_t) * nframes);

}

===================================================================

to

=================================================================

pthread_mutex_trylock(&jackmaster->mutex);

jackmaster->GetAudioOutSamples(nframes,jack_get_sample_rate(jackclient),outl,outr);

pthread_mutex_unlock(&jackmaster->mutex);

=================================================================
Also, an annoying little detail is that all the controllers are enabled

by default except main volume (controller 7) which is, of course, the

one I *always* want!
The change below cures that, and I believe will be rolled into the next

mantenance release.
In src/Params/Controller.cpp
Change:

    "volume.receive=0;"

To:

    "volume.receive=1;"
--

Will J Godfrey

http://www.musically.me.uk

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