Re: 96 Khz / 24 bit support with HAL?
Re: 96 Khz / 24 bit support with HAL?
- Subject: Re: 96 Khz / 24 bit support with HAL?
- From: Bill Stewart <email@hidden>
- Date: Tue, 22 Apr 2003 12:18:56 -0700
On Tuesday, April 22, 2003, at 11:20 AM, Chris Reed wrote:
On Tuesday, Apr 22, 2003, at 05:07 US/Central, Greg Gant wrote:
I was playing around with 96 Khz, 24 bit sound and noticed fairly
quickly that most apps, including Quicktime, do not support beyond 48
Khz, 16 bit sound. The apps that did support playback of high res
audio didn't. When I was using Peak 3.0, I noticed I was able to
playback sound when using CoreAudio setting but not when using either
of the HAL settings. The HAL (CoreAudio Framework) interfaces with
the Audio Family in the kernel yet its possible to bypass the HAL
itself and access CoreAudio. Also, its noted that CoreAudio supports
96 Khz/24 bit sound as current yet the M-Audio Revolution drivers
sport 192 Khz and the checkbox to boot. Also does Quicktime rely on
the HAL system? Lastly, any shareware/freeware apps that I can
recommend to readers that can playback 96 Khz/24 bit sound? Thanks
in advance for to any replies!
The HAL (Hardware Abstraction Layer) _is_ CoreAudio. I don't
understand what you mean by the difference between the two.
The HAL is the part of CoreAudio that provides the interface to
hardware audio devices. There are higher level parts of CoreAudio,
such as AudioUnits, but nothing lower level that user applications can
access.
I think the confusion is based on how Peak presents the various
"interfaces" to the *same* subsystem - the CoreAudio.framework which we
affectionately call the HAL (Hardware abstraction layer) - You should
talk to someone at Bias for a clarification of their UI options as I'm
not at all clear about the difference that they are trying to present
to the user.
Bill
Also, QuickTime still uses the Carbon Sound Manager (as David Duncan
pointed out). Many games will also still use the Sound Manager.
Although the Sound Manager is implemented on top of CoreAudio (the
HAL) in OS X, it still presents the old limitations to software that
uses it.
cheers
-chris
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