How to determine if streams in devices are enabled or disabled using OSX HAL
How to determine if streams in devices are enabled or disabled using OSX HAL
- Subject: How to determine if streams in devices are enabled or disabled using OSX HAL
- From: Memphiz <email@hidden>
- Date: Thu, 22 May 2014 18:57:15 +0200
Hi there,
I have a hard time to figure out how to determine if streams in an audio
device are enabled or disabled by the user. Take this audio-midi-setup
screen shot:
https://dl.dropboxusercontent.com/u/30371861/fireface1.png
This is a FireFace 800 which has 5 streams but only enabled the first
(checkbox checked for stream 1). When enumerating the streams of this
device i know want to only add the enabled streams into my list. How do
i do this using the HAL (no audio units only the lowest layer)?
I already tried to use the "kAudioDevicePropertyIOProcStreamUsage" and
evaluated the "mStreamIsOn" of the returned list but they all appear as
enabled (and indeed i can send audio to stream 2 without issue).
I am out of ideas here and would appreciate any help.
Kind regards from germany
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