[Openal] How to select output channel

[Martin Diz]

Thank you!!!
This would be the most correct way to achieve what i want...
I will read the documentation about this and as soon i get it working will
let you know how work everything!!!

Martin Diz


On Fri, Mar 27, 2009 at 13:34, Daniel PEACOCK <dpeacock at creativelabs.com>wrote:

> Hi,
>
> Another option would be to create a 5.1 (or 7.1) audio stream on the fly
> and put the mono audio data into the appropriate channel(s) and silence in
> the remaining channels. You could do this for each input channel or if you
> have lots of channels then you could mix everything together into one 5.1
> (or 7.1) stream.
>
> Doing this will guarantee that audio in the front-left channel will play
> out of the front-left speaker BUT only if the user has a 5.1 speaker system
> connected (and configured correctly). If the user has a different speaker
> system, e.g 2.0 or 4.0, each channel of the 5.1 or 7.1 channels will be
> virtualized.
>
> Dan
> Creative Labs (UK) Ltd.
>
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> [image: Inactive hide details for Jason Daly <jdaly at ist.ucf.edu>]Jason
> Daly <jdaly at ist.ucf.edu>
>
>
>
>     *Jason Daly <jdaly at ist.ucf.edu>*
>             Sent by: openal-bounces at opensource.creative.com
>
>             03/27/2009 03:22 PM
>
>
> To
>
> Martin Diz <listas at martirac.com.ar>
> cc
>
> "openal at opensource.creative.com" <openal at opensource.creative.com>
> Subject
>
> Re: [Openal] How to select output channel
>
> Martin Diz wrote:
>
>    Hello, i`m working on a project that requires surround sound.
>       I managed to play ogg file with no problem.
>       What i need to do next is to select which of the speaker in a 7.1 or
>       5.1 arrangement will play the sound.
>       for example i have file1.ogg and file2.ogg ( both mono channel
>       file`s), and should play file1 in the front left speaker and file2 in both
>       rear speakers.
>       I spent a lot of time in *google.com* <http://google.com/> but
>       didn't find the answer nor a place to get started with this issue.
>       Bay the way im using Linux 2.6.26-1-686, alsa, and a sound blaster
>       live 5.1.
>       The sourround sound works great on mi pc i tested it with others
>       applications.
>       I hope i make my self clear and some one could help me!
>       Thank you in advance.
>
>
> I don't think there's a way to force a sound to a particular speaker (there
> might be an extension for this, but I don't know of it).
>
> Probably the closest you can come is to place the sound at the appropriate
> coordinates to where OpenAL's normal spatialization will render it from that
> speaker.
>
> If I've got my coordinates straight, it'll be (-1.0, -1.0, 0.0) for
> file1.ogg, and (0.0, 1.0, 0.0) for file2.ogg, assuming you have the listener
> positioned at (0.0, 0.0, 0.0) (or you set the sources to be relative).
>
> You probably won't get 100% of the sound from the speakers you want (some
> of it will likely spread to other speakers), but it should be close.
>
> --"J"
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