[Openal] choppy sound :(
M. Kalthoff
m.kalt at web.de
Tue Jul 31 11:49:14 PDT 2007
Hi again,
yeah, Carlo, i guess you are right there.
when counting the steps over time(in a wave editor of course ;)
one can clearly estimate about ~40 steps per second, which leads
to an update interval of ~25msecs.
i'll test it on a machine with a better soundcard soon. but for
now i'll just think that that is the cause.
thanks.
matze
Carlo VOGELSANG schrieb:
> Hi Matze;
>
> This is probably caused because the Generic Software device (i.e. the
> software mixer) does not ramp volumes between the beginning
> and end of each mixing block. (i.e. the volume levels used for each
> speaker are constant for the whole block, even when the application
> calls setposition frequently).
>
> If the changes are too big between mixing blocks, you can get artifacts.
> A rapid moving sound (position changes close to the listener) can cause
> artifacts. Even though you might be updating pretty quickly, it's the
> size of the mixing blocks that determine the 'real' update rate (in this
> case 25msec)
>
> -Carlo
>
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> *"M. Kalthoff" <m.kalt at web.de>*
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> 07/28/2007 08:45 PM
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> Subject
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> Re: [Openal] choppy sound :(
>
>
>
>
> Hi,
>
> Sadly, installing the new OpenAL run-times didn't solve the problem.
>
> Maybe you get a better idea if you listen to a short sample i recorded
> [~84kB]
>
> http://www.hotlinkfiles.com/files/161131_cmfmy/artifacts.mp3
>
> You can hear there a rotating sine wave sample with outerCone = 60° and
> innerCone = 40°, while listener and source aren't moving.
>
> The artifacts are noticeable especially during the interpolation between
> inner and outer cone. Even at update rates >100 times/second(but it
> gets less intense/often).
>
> Same occurs with "fast" moving sources or listeners.
>
> If anyone has an idea, let me know.
>
> Thx,
>
> matze
>
>
>
> Daniel PEACOCK schrieb:
> > Hi,
> >
> > Can you please try installing the new OpenAL run-times available from
> > http://developer.creative.com/landing.asp?cat=1&sbcat=31&top=38
> <http://developer.creative.com/landing.asp?cat=1&sbcat=31&top=38>
> > <http://developer.creative.com/landing.asp?cat=1&sbcat=31&top=38
> <http://developer.creative.com/landing.asp?cat=1&sbcat=31&top=38>> and
> > seeing if this improves the situation?
> >
> > Thanks,
> >
> > Dan
> > Creative Labs, Inc.
> >
> > ------------------------------------------------------------------------
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> > Inactive hide details for "M. Kalthoff" <m.kalt at web.de>"M. Kalthoff"
> > <m.kalt at web.de>
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> > *"M. Kalthoff" <m.kalt at web.de>*
> > Sent by: openal-bounces at opensource.creative.com
> >
> > 07/17/2007 05:14 AM
> >
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> > Subject
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> > [Openal] choppy sound :(
> >
> >
> >
> >
> > oooops,
> > i forgot to change the mails-subject.
> > sorry.
> > and sorry for this mail, explaining the obvious.
> >
> > matze
> >
> >
> >
> > M. Kalthoff schrieb:
> > > Hi everyone,
> > >
> > > i've got a little problem, and hope someone can help.
> > > the sound is kind of chopped if i quickly move the listener or source.
> > > i'm updating as suggested in the effects extension guide.pdf[p. 45]
> > > at approximately 30 times per second.
> > > (the problem is the same but a little less noticeable if i remove the
> > > brake and update at >100 times per second)
> > >
> > > current hardware setup is:
> > > Pentium 4 2,4GHz
> > > 512MB
> > >
> > > [0] "Generic Software" (default)
> > > Effect Extension Supported: YES
> > > Supported Specification Version: 1.1
> > >
> > > Max Sources: 256
> > > Max Effect Slots: 128
> > > Max Aux Effect Slots: 1
> > > Max Aux Effect Slot Sends: 1
> > > [...]
> > >
> > >
> > > current test-scene setup is:
> > > - 1 sound source (a looping sine wave sample)
> > > at [0, 0, 0]
> > > slowly rotating (10s per 360°)
> > > inner cone = 45°
> > > outer cone = 180°
> > >
> > > everything sounds fine, is directional and calculated correctly,
> > > i guess.
> > > if i now quickly move the listener(which is attached to the camera),
> > > the sound gets choppy as if i wouldn't update the listeners position
> > > as often as needed.
> > >
> > > would be nice if someone could give me a hint for fixing this.
> > > thanks.
> > >
> > > m. kalthoff
> >
> >
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