[Openal] Replacing QuickTime with OpenAL

[Jason Daly]

Chris Robinson wrote:
> On Thursday 05 June 2008 05:28:07 am Petr Mikšík wrote:
>   
>
> The capture extension is likely present on any implementation so long as the
> hardware supports capture. That should work fine as long as your card is set
> up to capture output. Open a playback device, open a capture device, then
> capture samples regularly as you use the playback device normally.
>   

This is tricky, though.  You first have to have hardware that supports 
capture of the PCM channel.  I know Creative cards typically support 
this, but in my experience, most on-board sound chips don't.  Typically, 
you can only capture from the ADC channels (mic or line).  They probably 
do this because it's easy for a novice user to set up a feedback loop 
between an input and the PCM channel.

Even on hardware that supports it, you have to be sure that the PCM 
channel is selected for capture, and OpenAL has no control over this.

Like Chris said, if this app is only used internally, you're probably 
fine with using OpenAL-Soft and the "wave" backend.  If you're shipping 
this application, there might not be an adequate solution for you in 
OpenAL land.


--"J"
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