[Openal] Capture output

[bojkar]

wow thanks very mush for full reply :) I must read about mixer api. Thanks
one
more time!



Garin Hiebert wrote:
> 
> 
> On March 11, 2008, bojkar at go2.pl wrote:
> 
>> I still don't know how to capture output :/ 
>> I searched a lot of forums and search engine's and nothing.
> 
> OpenAL didn't attack the complex subject of mixer controls -- it's 
> assumed that the user sets up the input(s) with the appropriate levels.
> 
> For Windows, if you want to programatically handle mixing then you need 
> to use the mixer API.  There's a fair amount of info out there, and a 
> Google search turned up this article which looks pretty good at first 
> glance -- http://www.borg.com/~jglatt/tech/mixer.htm.  There are lots 
> of "gotchas" with this stuff, so you'll want to work very flexibly and 
> test on as many different sound card solutions as possible.
> 
> Gotchas that come to mind:
> 
> 1)  The mixer "lines" have names which are individual to the driver -- 
> so "Aux" on one card may be "Auxiliary" on another and "Line In 1" on 
> another...  If the driver is in French -- it will come back as a 
> localized string.
> 
> 2)  You can get around #1 to some degree by retrieving generic caps on 
> the mixer controls, which can tell you things like "this is a line 
> input" in a language-independent way.  That worked pretty well in the 
> Windows 3.1 era, but these days there may be multiple line inputs on a 
> card, so then you're back to trying to distinguish between them using 
> strings...
> 
> 3)  There isn't a define for "output" or (Creative parlance) "What You 
> Hear" -- so I don't think #2 will work for your specific application.
> 
> 4)  I don't know exactly what the deal is with Windows Vista, but I 
> expect this old API is probably still supported.  You'll want to make 
> sure.  If you have a vertical application that can be restricted to 
> Vista, then you may want to investigate Vista's native audio API (Core 
> Audio -- not to be confused with Apple's!)  Whether or not it can be 
> cleanly used alongside OpenAL (especially native OpenAL libraries) is 
> not known to me, but Vista does have a new audio system which 
> presumably contains a new mixer API -- so maybe it would work better 
> than the old API if you can restrict yourself to Vista...
> 
> Once you dig into this stuff, I think you'll understand why OpenAL 
> didn't tackle it for even a single platform, much less multiple 
> platforms.  Good luck!
> 
> Garin
> 
> 
> _______________________________________________
> Openal mailing list
> Openal at opensource.creative.com
> http://opensource.creative.com/mailman/listinfo/openal
> 
> 

-- 
View this message in context: http://www.nabble.com/Capture-output-tp15983806p16023010.html
Sent from the OpenAL - User mailing list archive at Nabble.com.