Mac OS USB Audio question -- asynchronous isochronous mode
Mac OS USB Audio question -- asynchronous isochronous mode
- Subject: Mac OS USB Audio question -- asynchronous isochronous mode
- From: Borislav Trifonov <email@hidden>
- Date: Fri, 25 May 2007 03:31:20 -0700
The USB Audio standard uses isochronous transfer in one of three modes:
synchronous, adaptive, or asynchronous. I'm developing hardware that
will use the asynchronous mode to communicate with the computer, so that
it is the one doing flow control.
My question stems from something someone told me about Windows, that it
actually will resample the data if asynchronous mode is used, which is
bad and not in the spirit of the standard specification. So I want to
confirm that Mac OS will _not_ do that when asynchronous USB Audio is
used, and the data will be bit-perfect -- the PCM data the player
application sends to the system is exactly what comes out the USB port.
Can someone confirm or deny?
Thank you.
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