NullAudio example driver creates "Data Source Item 0"
NullAudio example driver creates "Data Source Item 0"
- Subject: NullAudio example driver creates "Data Source Item 0"
- From: Kyle Sluder <email@hidden>
- Date: Wed, 13 Mar 2013 21:52:32 -0700
I built and installed the NullAudio sample driver from
<https://developer.apple.com/library/mac/#samplecode/UserLandDriverReference/Introduction/Intro.html>.
* If I select the Null device in Audio MIDI Setup, the Source popup for
both Input and Output gives the option of choosing from Data Source Item
0 through Data Source Item 4.
* If I open the Sound preference pane in System Preferences, four new
items appear on the Input and Output panes: Null and Data Source Item 0
through Data Source Item 3.
* If I option-click on the speaker icon in the menu bar, a new item
appears: Data Source Item 0.
I have two questions:
1. Why are there four items appearing in System Preferences and Audio
MIDI Setup? Does NullAudio not sufficiently describe these items as
input- or output-only devices? Does it not sufficiently describe them as
stereo pairs?
2. I'm assuming the "Data Source Item" names are stemming from
NullAudio's lack of providing names for its objects. But why does the
name show up as Null in the Sound preference pane, but Data Source Item
0 in the speaker menu extra's option-click menu?
--Kyle Sluder
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden