Re: calling audio device listener on master channel volume?
Re: calling audio device listener on master channel volume?
- Subject: Re: calling audio device listener on master channel volume?
- From: Navyn Muhammed Rajoo <email@hidden>
- Date: Thu, 24 Aug 2006 17:53:32 -0400
im using the kAudioHardwarePropertyDefaultSystemOutputDevice from my
g4 ibook, and im pretty sure there is a master channel there. thx
On Aug 24, 2006, at 5:14 PM, Jeff Moore wrote:
If the device in question doesn't have a master channel volume
control, then signing up to listen to changes in it's value won't
do you a lot of good.
The volume slider in the Sound Prefs figures out where the volume
controls on the device are and uses them appropriately to simulate
a master volume control when there really isn't one by adjusting
the volume controls on the individual channels.
On Aug 24, 2006, at 1:57 PM, Navyn Muhammed Rajoo wrote:
OSStatus result = AudioDeviceAddPropertyListener(_audioDevice, 0,
0, kAudioDevicePropertyVolumeScalar, callback, &clientData);
above doesn't work, but when i call add property listener on the
stereo channels Left and Right the callback function gets called
even when i adjust the master volume slider in system preference,
but the problem is the left channel changes its scalar volume
before the right, and this poses a problem to the output i wanna
achieve. Could someone tell me how i could add a volume listener
just for the master channel volume change?
OSStatus result = AudioDeviceAddPropertyListener(_audioDevice, 1,
0, property, callback, &clientData);
OSStatus result = AudioDeviceAddPropertyListener(_audioDevice, 2,
0, property, callback, &clientData);
--
Jeff Moore
Core Audio
Apple
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