[Openal] Audiosink

[Garin Hiebert]

> I am writing an audiosink, my scenery:
>
> filesource -> decode -> audiosink
>   

I'm probably not the right person to answer this, because I don't know 
what an "audiosink" is (although it seems to be a term associated with 
audio in Java), but since nobody else is taking a shot at answering...

> The application should be able to decode AC3, DTS, OGG
>   
Those three formats are hopefully being handled by a library (or the 
host application) outside of OpenAL -- those aren't native formats.
> OpenAl 
> should determine the correct pitch alteration and gain
>
> attenuation to render the sound!
If your application provides velocity and position data, then OpenAL can 
indeed provide 3D positioning and Doppler-related pitch shifting.  The 
application can also modify individual source gain and pitch in addition 
to the distance and Doppler-related factors.
>  If I understood the
> key to streaming is use queue, ok?
>   
Yes, you'll want to use the queuing mechanism for streaming.
> if I want to add some sound affects such as rotation,
> dopler, reverb, should I create some properties?
>   
This is a matter of the design of the audio class above OpenAL, but yes 
that seems like the right approach.  For effects, you may want to 
consider the EFX extension if you are running on Windows (EFX is now 
part of the public OpenAL 1.1 SDK for Windows, available at 
"http://developer.creative.com/articles/article.asp?cat=1&sbcat=31&top=38&aid=45").

Garin