Re: Purpose of kAudioDevicePropertyChannelNumberNameCFString
Re: Purpose of kAudioDevicePropertyChannelNumberNameCFString
- Subject: Re: Purpose of kAudioDevicePropertyChannelNumberNameCFString
- From: email@hidden
- Date: Thu, 21 Dec 2006 15:29:56 -0500
Hi Jeff,
Thanks for your reply.
Yes, your example shows what I was expecting to see based on the
comments in the include file. However, what I am observing with my 2
examples is that the Number name is the same as the category name. So,
for example if the Category name is "Analog outputs", each channel's
number name is also "Analog outputs" with no difference for each
channel. It is possible that there is a bug in my program, the device
driver(s) for the (2) devices, or in the CA API.
Jeff Moore wrote:
The number name is used in conjunction with the category name to allow
you to label a bank of things. For example, here's a bank of sliders
labled with the category and each slider labeled with the number (pardon
my ascii art):
----- Category ----
| | |
| | |
+ + +
| | |
| | |
Number Number Number
On Dec 21, 2006, at 7:27 AM, email@hidden wrote:
In my simple host program I've started to query the Name properties
for my output devices. I have 2 Firewire devices, Digidesign MBox 2
Pro and M-Audio FireWire Audiophile. On both of these devices, the
ChannelName, ChannelNumberName and ChannelCategoryName properties are
available in the Output section. However, ChannelNumberName and
ChannelCategoryName seem to be always returning identical strings (to
each other), for every channel. The properties are not available on
the Built-in audio.
I was expecting a string such as "1" or "One" for the
ChannelNumberName on Channel 1. What is the expected behavior?
HALLab does not seem to display these properties.
--
Jeff Moore
Core Audio
Apple
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