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Re: Default audio output - getting device changed notification?
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Re: Default audio output - getting device changed notification?


  • Subject: Re: Default audio output - getting device changed notification?
  • From: Jean-Daniel Dupas <email@hidden>
  • Date: Wed, 23 Jun 2010 12:44:04 +0200

This sample show how to listen audio notifications. To demonstrate how notifications work it installs a listener for kAudioHardwarePropertyDevices.

Listening an other property like kAudioHardwarePropertyDefaultInputDevice, kAudioHardwarePropertyDefaultOutputDevice, kAudioHardwarePropertyDefaultSystemOutputDevice is left as an exercise to the reader, as mention in the following comment:

/*
 * These are the other types of notifications we might receive, however, they are beyond
 * the scope of this sample and we ignore them.
 *
        case kAudioHardwarePropertyDefaultInputDevice:
            fprintf(stderr, "AHPropertyListenerProc: default input device changed\n");
        break;

        case kAudioHardwarePropertyDefaultOutputDevice:
            fprintf(stderr, "AHPropertyListenerProc: default output device changed\n");
        break;

        case kAudioHardwarePropertyDefaultSystemOutputDevice:
            fprintf(stderr, "AHPropertyListenerProc: default system output device changed\n");
        break;
*/

Hint:
AudioHardwareAddPropertyListener(kAudioHardwarePropertyDefaultInputDevice, AHPropertyListenerProc, self );
AudioHardwareAddPropertyListener(kAudioHardwarePropertyDefaultOutputDevice, AHPropertyListenerProc, self );
AudioHardwareAddPropertyListener(kAudioHardwarePropertyDefaultSystemOutputDevice, AHPropertyListenerProc, self );

Le 23 juin 2010 à 12:34, tahome izwah a écrit :

> Thank you but that code only works when audio devices are plugged in
> or removed. I need a notification when the default audio output device
> is changed via the system control panel and it doesn't look like the
> AudioDeviceNotify example has that capability.
>
> thanks!
> --th
>
> 2010/6/23 Jean-Daniel Dupas <email@hidden>:
>>
>> Le 23 juin 2010 à 10:34, tahome izwah a écrit :
>>
>>> Hi all,
>>>
>>> is there a way to sign up for notifications when the default audio
>>> output (the one in the system prefs, ie.
>>> kAudioHardwarePropertyDefaultOutputDevice) has been changed? If so,
>>> how? I wasn't able to find anything in the docs.
>>
>>
>> What about the AudioDeviceNotify sample code ?
>>
>> http://developer.apple.com/mac/library/samplecode/AudioDeviceNotify/Introduction/Intro.html
>>
>>
>> -- Jean-Daniel
>>
>>
>>
>>
>>

-- Jean-Daniel



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  • Follow-Ups:
    • Re: Default audio output - getting device changed notification?
      • From: tahome izwah <email@hidden>
References: 
 >Default audio output - getting device changed notification? (From: tahome izwah <email@hidden>)
 >Re: Default audio output - getting device changed notification? (From: Jean-Daniel Dupas <email@hidden>)
 >Re: Default audio output - getting device changed notification? (From: tahome izwah <email@hidden>)

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