Re: Built-in audio hardware question
Re: Built-in audio hardware question
- Subject: Re: Built-in audio hardware question
- From: Jeff Moore <email@hidden>
- Date: Mon, 19 May 2008 11:37:11 -0700
Actually, please don't parse the contents of the device UID or model
UID string. As the headerdoc for kAudioDevicePropertyDeviceUID says:
"The content of the UID string is a black box". While it is true that
the UID for the built-in hardware for a lot of our hardware, it is
definitely not true for all of our hardware now and there's no
guarantees about what it will be in the future.
That said, the most reliable way to determine whether the given device
ID you have is for a built-in device or not is to use the property,
kAudioDevicePropertyTransportType. The built-in devices will have
kIOAudioDeviceTransportTypeBuiltIn as the value for this property.
On May 19, 2008, at 4:10 AM, Mikael Hakman wrote:
On Sunday, May 18, 2008 8:44 AM, tahome izwah wrote:
is there any way to uniquely identify and select the built-in
hardware
as an audio device? I am not talking about the *default* device (the
one selected in the Sound control panel) - I am specifically looking
for a way to select the *built-in* device no matter what device is
set
in the Sound prefs.
Selecting the device by name obviously doesn't work on all systems
due
to localization. What would be the best way to do this?
I'm assuming that you ask how to find, in your program code, device
id corresponding to the built-in hardware, in language
(localization) independent way. I get list of all device ids. Then
in a loop I ask each device for its model UID and compare this to
the model UID I want to use (which I read from a configuration
plist). In my MBP and iMac, the built-in output device model UID is
"AppleHDA". You could also use model instance UID which would be
"AppleHDA:0" in this case. I don't know whether this model UID is
the same in MB, and in the other, older, or future Mac computers.
--
Jeff Moore
Core Audio
Apple
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