Re: Published! Technical Note TN2274: USB Audio on the Mac
Re: Published! Technical Note TN2274: USB Audio on the Mac
- Subject: Re: Published! Technical Note TN2274: USB Audio on the Mac
- From: Iain McCowan <email@hidden>
- Date: Wed, 11 Aug 2010 13:43:54 +1000
Brian,
Thanks for your response. I will repost a summarised version on the USB list.
A review of the hardware of the newest Macs at my local shop shows that the USB bus architecture has been changed since my MacbookPro5,3 model. Now it seems that only high-speed busses exist on most new Macs, or else where full-speed busses exist these have been reconfigured to have one free of any internal clients. So perhaps my problem will only be a legacy one for some users, and so offering a USB hub to these users is indeed the best solution.
I am fairly confident my device is as compliant as possible, as it has been tested by a respected USB audio driver development company.
thanks,
Iain.
On Wed, Aug 11, 2010 at 1:15 PM, Brian Willoughby
<email@hidden> wrote:
On Aug 9, 2010, at 17:00, Iain McCowan wrote:
Not sure if this email belongs on the Core Audio list or some driver list, but seeing that the USB Driver Tech Note was posted here, am following up to that...
I am developing a USB audio device and am working hard to make it properly compliant with the class definition 1.0.
We have implemented the device following the synchronous endpoint model, so the device internally locks its ADC clock to the SOF signal. This has been tested and appears to work accurately.
Even though your device firmware is working on many computers, there still could be a flaw. It is often the case that USB devices will work with other platforms but fail on the Mac, and the verdict usually ends up being that the device is not truly USB compliant while the Mac is perfectly compliant. In your case, I realize that your device also works with many Macs and even with older versions of OSX, but it still seems like there is not a clear cut case for which end is responsible.
There are some audio hardware developers here on the CoreAudio list, but I've seen far more detailed USB audio discussions on the USB list. You might find more help there.
Brian Willoughby
Sound Consulting
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