Re: Hardware accelerated audio decoding?
Re: Hardware accelerated audio decoding?
- Subject: Re: Hardware accelerated audio decoding?
- From: Jeff Moore <email@hidden>
- Date: Tue, 17 Dec 2002 10:55:35 -0800
On Tuesday, December 17, 2002, at 07:34 AM, Dan Christainsen wrote:
On Monday, December 16, 2002, at 08:18 PM, Jeff Moore wrote:
Like I said, you can't use the AudioUnit to do the IO. You have to
use the HAL. There is a bit of sample code in our recent SDK that
shows this feature off (provided you have the hardware). It's
installed at /Developer/Examples/CoreAudio/HAL/HALPlayFile. The code
is kind of ugly but it gets the point across.
I couldn't get your sample application to work - no matter what I do
it exits with code 1. It seems to bail out somewhere in the file
factories. I'm running 10.2.2 with the latest devtools.
Anyway, I'm pretty sure my iMac DV (IIRC, it's the first DV model) is
the one with "enhanced AC-3 support", but the test application in
<http://aldebaran.armory.com/~zenomt/macosx/MTCoreAudio/> only lists
linear PCM output.
Is it my mac that simply doesn't support it?
We don't ship any hardware decoders or digital interfaces on any of our
machines as far as I know.
I couldn't find anything stating that other standard mac sound card
should have AC-3 outputs.
The M-Audio Sonica is one (it's a USB device). There are others out
there too. Note that most of the time, this support is not for
decoding, but rather for the ability to transport the data digitally to
a decoder. You can get the same behavior on devices that don't support
the format directly by using native mode (which HALPlayFile also
illustrates).
--
Jeff Moore
Core Audio
Apple
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