Re: AirTunes API and DTS
Re: AirTunes API and DTS
- Subject: Re: AirTunes API and DTS
- From: Jeff Moore <email@hidden>
- Date: Mon, 24 Jan 2005 12:30:19 -0800
On Jan 22, 2005, at 8:37 AM, Ionel GARDAIS wrote:
I've read OS X sound architecture uses a mixer that
can expends to an infinite number of virtual tracks
(one per app just like the BeOS mixer).
Actually, it's more flexible than that. The mixer in the driver
supports any number of clients, even within a single process. The only
catch is that everything has to be mixed down to the device's stream
layout prior to handing things off to the driver. This makes sure that
the scope of a driver is small enough to be manageable. Plus, it's more
efficient if the real mix engine is in user-space and as little as
possible is going on in the kernel.
Is it possible to use DTS in a track and control each
channel independently (say 6 virtual channels for a
5.1 DTS mix plus a master slide for the overall DTS
level) ?
If DTS offers such control (I have no idea if it does or not), the
commands to do use them would be buried in the encoded DTS data stream.
As such, you would be doing all your authoring in that format and you
would also rely on having hardware around that knows how to decode the
DTS stream and apply the commands to the contents of the stream.
--
Jeff Moore
Core Audio
Apple
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