[Openal] multichannel output

[Artem Baguinski]

thanks Daniel!

 On Tue, Apr 22, 2008 at 7:25 PM, Daniel PEACOCK
 <dpeacock at creativelabs.com> wrote:


>  For a fixed environment like you describe you have a couple of options of
 > how to use OpenAL to accomplish your goal ...
 >
 >  If you install a Sound Blaster X-Fi card you can use OpenAL to provide 3D
 > Audio spatialization that is rendered to one of these speaker modes :
 > Headphones, Stereo, 4.0, 5.1, 6.1 (Win XP only), and 7.1. The soundcard
 > assumes particular speaker layouts for these modes - but you can use a
 > bundled application called THX Speaker Console to adjust the angles and
 > distances of the various speakers from the listener so that the soundcard
 > can change the spatialization algorithms.


can one programmatically control THX Speaker Control in real time
 (apart from figuring out the window handles of UI controls and
 controlling those).


>  If you need to drive more than 8 speakers or have greater control over the
 > locations of the speakers (e.g you have a speaker on the ceiling) then you
 > are probably going to need to write your own OpenAL renderer or find someone
 > that already does this sort of panning. You will probably need to use
 > multiple soundcards to get enough output channels.


right, that's what i thought. thanks again.



> "Artem Baguinski" <artm at v2.nl>
 >  Sent by: openal-bounces at opensource.creative.com
 >
 > 04/22/2008 01:01 AM
 >
 >
 > To
 >  openal at opensource.creative.com
 >
 >
 > cc
 >
 >
 >
 > Subject
 >  [Openal] multichannel output
 >
 >
 >
 >  hello openal
 >
 >  My lab is going to work with a sound artist on an interactive
 >  soundscape installation, where the audience controls 3 dimensional
 >  audio synthesizer (indirectly - they are being tracked in space and
 >  their movements / location etc control the composition to some limited
 >  extent).
 >
 >  Fot the spatialization part I would like to use openal, if possible,
 >  because I know the API, it is integrated in our tools and we'd like to
 >  reuse the software we'd write for this installation later. But I'm not
 >  sure which combination of OS, hardware and driver/openal
 >  implementation can do what we want:
 >
 >  - the physical space is at least 10x10 meters room
 >  - the sound output gets amplified and output from largish speakers at
 >  80-100 dB, well at least I hope it's these levels in the middle of the
 >  room, not harder.
 >  - how many speakers and where they are hung remains to be determined.
 >  - the virtual sound sources are "hung" in the room
 >  - the primary participant's position and head orientation are tracked
 >  with a number of sensor systems
 >
 >  we'd like to adjust the sound scape for the primary visitor in
 >  realtime, based on relative positions of the visitor and ther
 >  speakers, to maintain the illusion of sound sources located inside the
 >  room - between the speakers. the rest of the audience sort of hears
 >  the soundscape from wrong perspective - not unlike secondary
 >  (untracked) viewers in VR Cave see the images distorted, while the
 >  primary (tracked) viewer sees it just right.
 >
 >  it is my understanding that this isn't something openal is designed to
 >  do out of the box, but may be there are some tricks to at least
 >  approximate this?
 >
 >  the fallback scenario is to give tracked visitors headphones and
 >  combine the "average" sound scape in the physical space with a
 >  "personalized" one in the headphones. still the question remains for
 >  the loud part - which platforms / hardware / drivers support output to
 >  how many channels and how accurate the physical properties of the
 >  attached speakers can be configured to localize the virtual sources in
 >  physical space.
 >
 >  or am i completely dellusional and should look at some other rig for
 >  what we have in mind?
 >
 >  --
 >  cheers,
 >  artm
 >
 >  http://lab.v2.nl/
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 >  Openal at opensource.creative.com
 >  http://opensource.creative.com/mailman/listinfo/openal
 >
 >  ForwardSourceID:NT0005F716
 >



 --
 cheers,
 artm

 http://lab.v2.nl/



-- 
cheers,
artm

http://lab.v2.nl/