Equalizer Effect Output Levels

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Equalizer Effect Output Levels

by Paul McDonald-2 :: Rate this Message:

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Hi there,

I'm trying to create a little visual effects program which uses OpenAL. The idea is to change the colours of the scene in time to a music track.

I was hoping to use the built in EFX equalizer as a spectrum analyzer. The four bands would be ideal for outputting to a graphics shader vector, as long as I have correctly "tuned" the frequency bands to the music I'm using. This would save me having to write any filtering functions.

So my question is: Is it possible to get the output levels of each band in the equalizer which are used in the final mix?

I don't need to hear the equalized track, so I can set the effects gain to zero. I will pay out the direct sound and hopefully just use the relative levels of the equalizer bands as some input to the graphics shaders.

Thanks,
Paul

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Re: Equalizer Effect Output Levels

by Daniel PEACOCK :: Rate this Message:

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Hi Paul,

I'm afraid this isn't possible as there is no mechanism in place to query
properties from an Effect hosted in an Auxiliary Effect Slot. I don't
think the Equalizer effect as it is today would give you the values you
need for your spectrum analyze anyway.

Dan
Creative Labs (UK) Ltd.

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Paul McDonald
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Subject
04/01/2009 09:56 [Openal-devel] Equalizer Effect
AM Output Levels

Hi there,

I'm trying to create a little visual effects program which uses OpenAL. The
idea is to change the colours of the scene in time to a music track.

I was hoping to use the built in EFX equalizer as a spectrum analyzer. The
four bands would be ideal for outputting to a graphics shader vector, as
long as I have correctly "tuned" the frequency bands to the music I'm
using. This would save me having to write any filtering functions.

So my question is: Is it possible to get the output levels of each band in
the equalizer which are used in the final mix?

I don't need to hear the equalized track, so I can set the effects gain to
zero. I will pay out the direct sound and hopefully just use the relative
levels of the equalizer bands as some input to the graphics shaders.

Thanks,
Paul_______________________________________________
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Openal-devel@...
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Re: Equalizer Effect Output Levels

by Paul McDonald-2 :: Rate this Message:

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Hi Dan,

Thanks for the quick response. I was afraid you might say that. Programming filters it is then... ugh!

Thanks,
Paul

2009/4/1 Daniel PEACOCK <dpeacock@...>

Hi Paul,

I'm afraid this isn't possible as there is no mechanism in place to query properties from an Effect hosted in an Auxiliary Effect Slot. I don't think the Equalizer effect as it is today would give you the values you need for your spectrum analyze anyway.

Dan
Creative Labs (UK) Ltd.

Notice
The information in this message is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying or distribution of the message, or any action taken by you in reliance on it, is prohibited and may be unlawful. If you have received this message in error, please delete it and contact the sender immediately. Thank you.

Creative Labs UK Ltd company number 2658256 registered in England and Wales at Belmont Road, Belmont Place, Maidenhead, Berkshire, SL6 6TB

Paul McDonald <pmcdonal@...>

Paul McDonald <pmcdonal@...>
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04/01/2009 09:56 AM

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Subject

[Openal-devel] Equalizer Effect Output Levels

Hi there,

I'm trying to create a little visual effects program which uses OpenAL. The idea is to change the colours of the scene in time to a music track.

I was hoping to use the built in EFX equalizer as a spectrum analyzer. The four bands would be ideal for outputting to a graphics shader vector, as long as I have correctly "tuned" the frequency bands to the music I'm using. This would save me having to write any filtering functions.

So my question is: Is it possible to get the output levels of each band in the equalizer which are used in the final mix?

I don't need to hear the equalized track, so I can set the effects gain to zero. I will pay out the direct sound and hopefully just use the relative levels of the equalizer bands as some input to the graphics shaders.

Thanks,
Paul_______________________________________________ Openal-devel mailing list Openal-devel@...http://opensource.creative.com/mailman/listinfo/openal-devel
ForwardSourceID:NT0006AC96

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Registering Extensions

by Richard Furse-2 :: Rate this Message:

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Hi there - I've tried to register some extensions at icculus.org but ran into a problem with the database. Any idea whom I should contact? The address I had previously for RCG hasn't produced a response...

cheers

--Richard

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Re: Registering Extensions

by Jason Daly :: Rate this Message:

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Richard Furse wrote:

Hi there - I've tried to register some extensions at icculus.org but ran into a problem with the database. Any idea whom I should contact? The address I had previously for RCG hasn't produced a response...

That's Ryan Gordon's site, I believe. I haven't heard from him in a while, though.

The last address I had was icculus 'at' icculus 'dot' org

If Ryan has dropped off the radar, we might need to move the registry.

--"J"

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RE: Registering Extensions

by Richard Furse-2 :: Rate this Message:

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All sorted (Ryan fixed the site).

From: openal-devel-bounces@... [mailto:openal-devel-bounces@...] On Behalf Of Richard Furse
Sent: 08 April 2009 15:08
To: openal-devel@...
Subject: [Openal-devel] Registering Extensions

Hi there - I've tried to register some extensions at icculus.org but ran into a problem with the database. Any idea whom I should contact? The address I had previously for RCG hasn't produced a response...

cheers

--Richard

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