[Openal] Implementing a Mac-based system

[Jean-Michel TRIVI]

Hi Matthew,
You can use any USB/Firewire multichannel audio solution. You need to
launch "Audio MIDI setup.app" (in "Applications/Utilities/") and configure
it to whatever format you need and OpenAL will spatialize sounds according
to that format. If you use an AV receiver, you'll need one that has 7.1
analog in. Otherwise computer oriented speaker systems like the Creative
Gigaworks 750 would work: it's a 7.1 speaker system with 7.1 analog in
(http://www.creative.com/products/product.asp?category=4&subcategory=113&product=9306).
Regards,
      Jean-Michel.

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             Matthew Tata                                                  
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Hi Ray,

Thanks for that info.  Can you or anybody else on the list think of a way
to get 7.1 surround from a Macbook Pro using OpenAL?  Or am I limited to
buying sound cards for desktop machines?

Cheers,

Matt




On May 11, 2007, at 9:32 AM, Raymond Balogh wrote:

      Hi Matt,

      1. Yes, but I don`t think it will help in your case. Optical and
      Coaxial SPDIF outputs (like the one you mentioned handle multichannel
      sound only in encoded form (Dolby Digital or DTS and their variants).
      That means there is an encoded bitstream sent through the output and
      it can be anything from 1.0 mono to 7.1 surround based on what
      encoding has been used. If the source is not encoded you will only
      get stereo signal using the mentioned SPDIF connection.

      2. The S750 does not have digital inputs. You would need an external
      device to convert digital signal to analog and feed that to the
      speaker system.

      3. I don`t know :-)


      Regards,
      Ray

      On Thu, 10 May 2007 22:27:54 +0100, Matthew Tata <
      matthew.tata at uleth.ca> wrote:

            Hi,

            I use OpenAL in conjunction with a Creative soundcards and
            speakers
            to do auditory research.  We're transitioning our entire lab
            (slowly)
            to Apple computers and I need some advice on the hardware
            setup.
            Most of what we do requires using Powerbooks and Macbook Pros,
            which
            have optical digital audio out.  Last I heard these only
            supported 5.1.

            1.  Does the digital output from a Macbook Pro handle 7.1
            speakers?
            2. Do I need an entirely new system with a digital tuner and
            speakers, or is there a way to use my existing Creative S750
            speakers?
            3.  What is the approximate latency between when my code calls
            for a
            source to play and when the sound actually plays with such a
            system?
            I need it to be reliably +/- 2 ms or less.

            I greatly appreciate all the help I've gotten from this forum.
            Thanks yet again.

            Regards,

            Matt

            --
            Matthew Tata, Ph.D.
            Assistant Professor
            The University of Lethbridge
            4401 University Drive
            Lethbridge, AB T1J 3M4
            ph. (403) 394-3994
            fax (403) 329-2775

            matthew.tata at uleth.ca






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