CODEWITHSUNDEEP
macoscore-audioaudiounit
FTNomad
FTNomad

Reputation: 175

How does one discover [non-Apple] Audio Units with Audio Component Services?

In OS X, I am trying to find an example of how to discover all the Audio Units installed on an end-users system and get back that information for display and use.

I know that Audio Component is involved with that task, but I am completely baffled how to go about doing it. All the examples I come across are based around finding a 'known' Apple AU with AudioComponentFindNext, and I cannot find an example for discovering anything else.

Can anyone point me to an example?

Thanks

Upvotes: 4

Views: 1262

Answers (2)

Moose
Moose

Reputation: 2737

Simply use the provided AVAudioUnitComponentManager components function to get audio units.

It will return an array of audio units that match the AudioComponentDescription you pass. Command click AudioComponentDescription and kAudioUnitType_MusicDevice to see the various values you can use.

// Exemple to get instruments audio units
var match = AudioComponentDescription()
match.componentType = kAudioUnitType_MusicDevice
        
let audioUnitComponents = AVAudioUnitComponentManager.shared().components(matching: match)

Upvotes: -1

sbooth
sbooth

Reputation: 16976

You can set up a AudioComponentDescription struct using 0 as a wildcard for type, subtype, and manufacturer. Pass that to AudioComponentFindNext:

AudioComponentDescription acd = { 0 };
AudioComponent comp = nullptr;
while((comp = AudioComponentFindNext(comp, &acd)) {
  // Found an AU
}

Here is some relevant documentation from the header:

@function       AudioComponentFindNext
@abstract       Finds an audio component.
@discussion     This function is used to find an audio component that is the closest match
                to the provided values.
@param          inComponent
                    If NULL, then the search starts from the beginning until an audio
                    component is found that matches the description provided by inDesc.
                    If non-NULL, then the search starts (continues) from the previously
                    found audio component specified by inComponent, and will return the next
                    found audio component.
@param          inDesc
                    The type, subtype and manufacturer fields are used to specify the audio
                    component to search for. A value of 0 (zero) for any of these fields is
                    a wildcard, so the first match found is returned.
@result         An audio component that matches the search parameters, or NULL if none found.

Upvotes: 3

Related Questions