Re: HALOutputUnit (Pt 1)
Re: HALOutputUnit (Pt 1)
- Subject: Re: HALOutputUnit (Pt 1)
- From: Jeff Moore <email@hidden>
- Date: Tue, 13 Jan 2004 16:32:13 -0800
Every USB device supported through the USB Audio Class driver built
into the system will work this way.
On Jan 12, 2004, at 8:04 PM, James Coker wrote:
Does this imply that all, or almost all USB audio devices will have
this setup?
Jim
On Jan 12, 2004, at 7:33 PM, Jeff Moore wrote:
Yes this is true. The USB spec doesn't require that the input side of
a device be clocked the same as the output side. They can even be
running at different sample rates and still be adhering to the spec.
From the HAL's point of view, the two sides of the device represent
two separate clock sources. Therefore the HAL publishes them as
separate devices through the API.
On Jan 12, 2004, at 5:54 PM, Robert Grant wrote:
Thanks a lot Bill - that clarifies things tremendously. And I think
I now know why Audio In from the HALOutputUnit was not working for
me a while back - I'm using a USB Audio I/O device and I guess that
shows up as two separate Audio Devices?
Robert.
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--
Jeff Moore
Core Audio
Apple
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