[Openal] Replacing QuickTime with OpenAL

[Dan Peacock]

Also - just a FYI ... on cards that do have the ability to capture
their own output (on Creative boards this feature is called
"What-U-Hear") ... this is *all* the audio output from the system -
not just one particular application.  i.e. If you are playing music
with WMP at the same time as your application, you will capture that
too.

Dan

On 6/5/08, Jason Daly <jdaly at ist.ucf.edu> wrote:
> 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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