Re: noise plugin q

[N. <net...@fo...>]

Richard Guenther wrote:
> 
> On Wed, 30 Jan 2002, [iso-8859-1] Jörn Nettingsmeier wrote:
> 
> > > > glame one, but somehow it only outputs half a second or so of white
> > > > noise, then falls silent.
> > > > what am i missing here ?
> > >
> > > You have to put the repeat filter behind it and enter a duration for
> > > that it should output noise, or you could use the ladspa white noise
> > > plugin.
> >
> > i see. is there a reason for this behaviour ?
> 
> Modularity ;) 

that's understandable.
 
> > normally i'd want an oscillator or noise source to go on endlessly.
> > would it be complicated to make this the behaviour for duration == 0?
> 
> No, but you might as well just use 1e30 then :) Would it be reasonable
> then to change the repeat time to default to 0.0 (i.e. endless)?

YUCK !

#define POSITIVE_INFINITY
10000000000000000000000000000000000000000000000
#define PI 4

in another reply, *nold writes:

> On Wed, Jan 30, 2002 at 06:14:51PM +0100, Richard Guenther wrote:
> > Yes, but what about making repeat repeating endless for time set
> > to zero seconds? And making that default?
> 
> Ah, this is fine by me.

from my pov, this would be the most intuitive behaviour.
 
> > one more thing:
> >
> > right now i'm using a spare sound card as an outboard effect for my
> > mixing desk. i build a filternetwork with gverb, choose hw1:0 as
> > alsa input and output device, and everthing works fine.
> >
> > however, the latency is a bit high for my taste.
> > i measured 46 milliseconds, which is a bit much except maybe for
> > ballad reverbs. i wonder, is that a hardware constraint of my crappy
> > card (ens1371) or can i reduce the buffer size that glame uses ?
> > maybe you can give me a hint where to look in the sources ?
> >
> > i tried the global settings dialog, but it has no effect, and it
> > does not allow for card-specific settings anyway. the proper place
> > for this is probably the "alsa-input->properties" widget...
> 
> No, the global settings dialog is what you are looking for. Just
> change the "Size hint for audio buffers [samples]" to 128 (or 64)
> and you should get reasonable latency (read: ~5ms) - dependent
> on the intelligence and internal buffering of the plugins, of course.
> At least that is the latency I get with my ISA SB AWE / via onboard
> sound (yepp, not full-duplex, but sampling from sb, playback on via,
> using OSS).

i see. will try that. i thought i had done that, but maybe the
changes didn't take effect...
(/me fiddles around)
yesss ! 64 samples buffer size, and 7 usec. great. 

alsa rocks ! 
(/me runs)

all i need to investigate now is a phase inversion i didn't notice
at any other settings (128 samples and above). but that does not
bother me too much right now, i'm doing vocals atm. but for drums,
it's gonna bite me...

> > btw, i've done about 2 cds worth of editing now with the new glame,
> > and i must say it has not crashed a single time for me yet. one can
> > kill it doing nasty things to the filternetwork, but other than
> > that, it's been rock solid for me. great work !
> 
> Hope so. Whats these "nasty" things? We might want to fix those
> issues, too.

i'll give it a beat and send you an strace. but so far, the things
that killed it all qualified as "extremely rude behaviour on the
user's part" which might as well be dealt with by "don't do that,
then".
but if you want... >;->

-- 
Jörn Nettingsmeier     
home://Kurfürstenstr.49.45138.Essen.Germany      
phone://+49.201.491621
http://spunk.dnsalias.org
http://www.linuxdj.com/audio/lad/