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Re: aggregate device

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Re: aggregate device

Subject: Re: aggregate device
From: "Christoph Teschner" <email@hidden>
Date: Sat, 29 Apr 2006 21:06:20 +0200

Jeff,

thanks a lot for your help. I was able to remove the mistakes I've made in my code and I've done the work around you suggested in order to create the aggregate device. I am no longer getting any errors, however I'm not sure if everything is working as it should be. The newly generated aggregate device appears in Audio MIDI Setup, but it still has 0 In and Out channels and the Build-In Audio is not selected for use (instead an unnamed device without channels is selected for use). Any further advice would be great.

thanks again,
Christoph

This is the newly modified code:

// 2. Create a CFDictionary that describes the aggregate device you want to create... // the keys are in <CoreAudio/AudioHardware.h> -> unique UID

CFMutableDictionaryRef myDict = CFDictionaryCreateMutable(kCFAllocatorDefault,0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

CFDictionarySetValue(myDict, CFSTR( "uid" ),CFSTR( "ChristophAggregate2" )); CFDictionarySetValue(myDict, CFSTR( "name" ),CFSTR( "ChristophAggregate2" ));

SInt32 privateKey = 0; CFDictionarySetValue(myDict, CFSTR( "private" ),CFNumberCreate(NULL, kCFNumberSInt32Type, &privateKey));

	// 3. Tell the base plug-in to create the aggregate device using
	//		kAudioPlugInCreateAggregateDevice.

	UInt32 outDataSize;

	AudioObjectPropertyAddress theAddress;
	theAddress.mSelector = kAudioPlugInCreateAggregateDevice;
	theAddress.mScope = kAudioObjectPropertyScopeGlobal;
	theAddress.mElement = kAudioObjectPropertyElementMaster;

result = AudioObjectGetPropertyDataSize(theID, &theAddress, 0, NULL, &outDataSize);

AudioObjectID theNewPsoidoID; result = AudioObjectGetPropertyData(theID, &theAddress, sizeof(CFDictionaryRef), &myDict, &outDataSize, &theNewPsoidoID); if(result != kAudioHardwareNoError) NSLog(@"AudioObjectGetPropertyData error");

//get list of all audio devices -> Build-In Audio is in deviceList[0] int numDevices; AudioDeviceID * deviceList; AudioHardwareGetPropertyInfo ( kAudioHardwarePropertyDevices, &theSize, NULL ); numDevices = theSize / sizeof(AudioDeviceID); deviceList = (AudioDeviceID *) malloc ( theSize ); AudioHardwareGetProperty ( kAudioHardwarePropertyDevices, &theSize, deviceList );

	//workaround: kAudioAggregateDevicePropertyFullSubDeviceList

	CFMutableArrayRef mySubDeviceList = CFArrayCreateMutable(NULL,0,NULL);

CFStringRef mySubdevice = CFStringCreateWithFormat(NULL, NULL, CFSTR("%i"), deviceList[0]); CFArrayAppendValue(mySubDeviceList,mySubdevice);

	theAddress.mSelector = kAudioAggregateDevicePropertyFullSubDeviceList;
	theAddress.mScope = kAudioObjectPropertyScopeGlobal;
	theAddress.mElement = kAudioObjectPropertyElementMaster;

result = AudioObjectSetPropertyData(theNewPsoidoID, &theAddress,0,NULL,sizeof(CFArrayRef), &mySubDeviceList); if(result != kAudioHardwareNoError) NSLog(@"AudioObjectGetPropertyData error");

//workaround kAudioAggregateDevicePropertyMasterSubDevice CFStringRef myMasterSubdevice = CFStringCreateWithFormat(NULL, NULL, CFSTR("%i"), deviceList[0]);

	theAddress.mSelector = kAudioAggregateDevicePropertyMasterSubDevice;
	theAddress.mScope = kAudioObjectPropertyScopeGlobal;
	theAddress.mElement = kAudioObjectPropertyElementMaster;

result = AudioObjectSetPropertyData(theNewPsoidoID, &theAddress,0,NULL,sizeof(CFStringRef), &myMasterSubdevice); if(result != kAudioHardwareNoError) NSLog(@"AudioObjectGetPropertyData error");


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References:  
  >Re: aggregate device (From: Jeff Moore <email@hidden>)




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