Re: Starting with AppleUSBAudio and CoreMIDI
Re: Starting with AppleUSBAudio and CoreMIDI
- Subject: Re: Starting with AppleUSBAudio and CoreMIDI
- From: Herbie Robinson <email@hidden>
- Date: Sun, 6 Mar 2005 03:59:19 -0500
In the projects we we are looking at
developing we would like to stream audio to the Host
from our device as well as pass MIDI Sysex/CC data
back and forth between the Host and our device. Am I
correct in my thinking that as long as we follow the
USB audio class spec and the USB MIDI class spec in
our firmware the default OS X drivers should
communicate with our device?
Should work.
Are there any pitfalls I should watch out for?
The USB MIDI class spec does not include time stamping. If you need
a lot of timing accuracy, you might want to consider something
proprietary. Esp if you need accurate timing of the MIDI in relation
to the audio.
Many USB audio devices have problems with bad grounds and/or power
supply noise susceptibility. Bad grounding tends to be a YMMV kind
of thing and will be dependent on the computer model and other
peripherals involved. In other words, it's a support nightmare. The
USB cable is NOT a good source for the audio ground!
--
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** http://www.curbside-recording.com/ **
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