Note that Windows still does not support High Speed USB Audio 2 Class Devices, while Mac OS X supports all of them with a class compliant driver. On Windows, each vendor must write a custom driver and users must install this driver before the device will work.
Given the choice between a system that supports cheap, low-quality audio out of the box, versus a system that supports high-quality audio with many channels without installing drivers, I'd prefer the latter. I'm not sure why Adaptive IN is not supported. The USB Specification does require that Adaptive IN be paired with isochronous synch OUT data. Do these CMedia and TI chips implement reception of the rate feedback? Perhaps there is an incompatibility between CoreAudio's pull model and adaptive input. I haven't studied the challenges involved at all. Brian On Aug 19, 2016, at 12:29 PM, Jean-Charles Rousset <[email protected]> wrote: > The technical note TN2274 about USB Audio on the Mac stipulates that Adaptive > mode is not supported for input stream (recording), only Synchronous and > Asynchronous. > > It is actually quite surprising as tons of consumer products integrate CMedia > or TI chips (usb audio converter) which use Adaptive mode for record. > > I tested a lot of them (cheap or not), also developed PCBs and hardware with > different chips and, indeed, audio buffers are quickly corrupted probably due > to a clock drift. > > This thread shows the problem encountered for more than 5 years by users : > https://discussions.apple.com/thread/2166616?tstart=0 > > What is exactly the limitation to support it on Apple products ? > > Note : I never had any problem with DAC (playback). Only ADC (record). > Note2 : it works on Windows & Android.
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