Re: Multiple Sound Devices
Re: Multiple Sound Devices
- Subject: Re: Multiple Sound Devices
- From: Mark Thomas <email@hidden>
- Date: Tue, 12 Feb 2002 09:36:12 +0000
- Organization: Coderus Ltd
Hi,
Its not using mono or stereo output, but if I have some USB speakers
plugged in, I want to send different sound data to the USB speakers, and
some other sound data to the internal speakers, as well as know that I have
these sound output devices, using the Sound Manager.
When you are in the Sound Control Panel, it seems to known about the
different output devices. Any Ideas how it does this ???.
Thanks
Mark.
>
on 2/11/02 8:03 AM, Mark Thomas <email@hidden> wrote:
>
>
> Hi,
>
> Sorry for asking a Sound Manager question, but there doesn't seem to be
>
> good one for this, and I guess this is an easy question for you guys :-).
>
>
>
> My application presently uses the Sound Manager API, it creates its Sound
>
> Channels, and everything works great, and I get sound out of all the
>
> speakers attached.
>
>
>
> But thought wouldn't it be cool, to have different sounds out of the
>
> different speakers.
>
>
>
> Is there a way to find out how many speakers devices you have attached,
>
> and then how to send the data to the different devices. I can see how you do
>
> this with Core Audio, but the Sound Manager api's seem hidden away, also any
>
> sample code would be great.
>
>
>
I once did performance test comparing stereo output to mono output with
>
Sound Manager. There was no difference. So why not just output stereo all
>
the time. In a mono situation the two channels will be mixed (averaged)
>
automatically, and this apparently causes no performance penalty.
>
>
Saying this makes me wonder whether in fact the mono situation actually
>
causes only the 1st (left?) channel info to be used. I have long had the
>
impression that this is not the case, although I can't say now where I
>
learned that. In any case it would be easy to verify that this is not a
>
problem.
>
>
-Kurt Bigler (not an apple employee)
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