fixes

native/driver/Source/Constants.swift

@@ -30,7 +30,7 @@ let kDeviceManufacturer = "Bitgapp Ltd"
 let kBoxDefaultName = "eqMac Box"
 
 let kPlugInBundleId = "com.bitgapp.eqmac.driver"
-let kBoxUID = "eqMacBox_UID"
+let kBoxUID = "EQMBox"
 let kDeviceUID = "EQMDevice"
 let kDeviceModelUID = "EQMDeviceModelUID"
 

native/driver/Source/EQMBox.swift

@@ -137,7 +137,11 @@ class EQMBox: EQMObject {
       return .integer(0)
     case kAudioBoxPropertyDeviceList:
       //  This is used to indicate which devices came from this box
-      return .integer(acquired ? kObjectID_Device : 0)
+      if acquired {
+        return .integer(kObjectID_Device)
+      } else {
+        return .null()
+      }
     default: return nil
     }
   }

native/driver/Source/EQMDevice.swift

@@ -113,7 +113,7 @@ class EQMDevice: EQMObject {
     case kAudioObjectPropertyControlList: return 6 * sizeof(AudioObjectID.self)
     case kAudioDevicePropertySafetyOffset: return sizeof(UInt32.self)
     case kAudioDevicePropertyNominalSampleRate: return sizeof(Float64.self)
-    case kAudioDevicePropertyAvailableNominalSampleRates: return 6 * sizeof(AudioValueRange.self)
+    case kAudioDevicePropertyAvailableNominalSampleRates: return UInt32(kSupportedSamplingRates.count) * sizeof(AudioValueRange.self)
     case kAudioDevicePropertyIsHidden: return sizeof(UInt32.self)
     case kAudioDevicePropertyPreferredChannelsForStereo: return 2 * sizeof(UInt32.self)
     case kAudioDevicePropertyPreferredChannelLayout:
@@ -183,7 +183,8 @@ class EQMDevice: EQMObject {
           kObjectID_Volume_Output_Master,
           kObjectID_Mute_Output_Master,
           kObjectID_DataSource_Output_Master,
-        ])      default: return .objectIDList([])
+        ])
+      default: return .objectIDList([])
       }
     case kAudioDevicePropertyDeviceUID:
       //  This is a CFString that is a persistent token that can identify the same
@@ -335,7 +336,8 @@ class EQMDevice: EQMObject {
         mNumberChannelDescriptions: UInt32(kChannelCount),
         mChannelDescriptions: AudioChannelDescription()
       )
-      let channelSize = MemoryLayout<AudioChannelDescription>.stride * channelDescriptions.count
+      // INFO: have to go with channelDescriptions.count - 1 as MemoryLayout<AudioChannelDescription>.stride might already contain the size for 1 channel
+      let channelSize = MemoryLayout<AudioChannelDescription>.stride * channelDescriptions.count - 1
       memcpy(&channelLayout.mChannelDescriptions, &channelDescriptions, channelSize)
       return .channelLayout(channelLayout)
     case kAudioDevicePropertyZeroTimeStampPeriod:

native/driver/Source/EQMDriver.swift

@@ -115,12 +115,12 @@ import CoreAudio.AudioServerPlugIn
     return "Unknown"
   }
   
-  static func calculateHostTicksPerFrame () -> Float64 {
+  static func calculateHostTicksPerFrame () {
     //  calculate the host ticks per frame
     var theTimeBaseInfo = mach_timebase_info()
     mach_timebase_info(&theTimeBaseInfo)
     var theHostClockFrequency = Float64(theTimeBaseInfo.denom) / Float64(theTimeBaseInfo.numer)
     theHostClockFrequency *= 1000000000.0
-    return theHostClockFrequency / EQMDevice.sampleRate
+    hostTicksPerFrame = theHostClockFrequency / EQMDevice.sampleRate
   }
 }

native/driver/Source/EQMInterface.swift

@@ -84,11 +84,10 @@ func EQM_Initialize (inDriver: AudioServerPlugInDriverRef, inHost: AudioServerPl
   if (EQMBox.name == nil) {
     EQMBox.name = kBoxDefaultName
   }
+
+  EQMDriver.calculateHostTicksPerFrame()
   
-  EQMBox.acquired = true
+  return noErr
-  EQMDriver.hostTicksPerFrame = EQMDriver.calculateHostTicksPerFrame()
-  
-  return kAudioHardwareNoError
 }
 
 func EQM_CreateDevice (inDriver: AudioServerPlugInDriverRef, inDescription: CFDictionary, inClientInfo: UnsafePointer<AudioServerPlugInClientInfo>, outDeviceObjectID: UnsafeMutablePointer<AudioObjectID>) -> OSStatus {
@@ -150,9 +149,9 @@ func EQM_PerformDeviceConfigurationChange (inDriver: AudioServerPlugInDriverRef,
   if !kSupportedSamplingRates.contains(where: { UInt64($0) == inChangeAction }) { return kAudioHardwareBadObjectError }
   
   EQMDevice.sampleRate = Float64(inChangeAction)
-  EQMDriver.hostTicksPerFrame = EQMDriver.calculateHostTicksPerFrame()
+  EQMDriver.calculateHostTicksPerFrame()
   
-  return kAudioHardwareNoError
+  return noErr
 }
 
 func EQM_AbortDeviceConfigurationChange (inDriver: AudioServerPlugInDriverRef, inDeviceObjectID: AudioObjectID, inChangeAction: UInt64, inChangeInfo: UnsafeMutableRawPointer?) -> OSStatus {

native/driver/Source/EQMObject.swift

@@ -19,6 +19,7 @@ protocol EQMObject: class {
 
 enum EQMObjectProperty {
   // Primitives
+  case null (Void? = nil)
   case audioClassID(AudioClassID)
   case bool(CFBoolean)
   case string(CFString)
@@ -43,6 +44,7 @@ enum EQMObjectProperty {
   
   func write(to address: UnsafeMutableRawPointer?, size: UnsafeMutablePointer<UInt32>, requestedSize: UInt32?) {
     switch self {
+    case .null(_):                          self.write(element: NSNull(), address: address, size: size)
     case .bool(let data):                   self.write(element: data, address: address, size: size)
     case .string(let data):                 self.write(element: data, address: address, size: size)
     case .float32(let data):                self.write(element: data, address: address, size: size)
@@ -67,10 +69,12 @@ enum EQMObjectProperty {
   
   
   private func write<T>(element: T, address: UnsafeMutableRawPointer?, size: UnsafeMutablePointer<UInt32>) {
-    // Write data size
+    if T.self != NSNull.self {
-    size.pointee = UInt32(MemoryLayout.size(ofValue: element))
+      size.pointee = UInt32(MemoryLayout.size(ofValue: element))
-    // Write data
+      address?.assumingMemoryBound(to: T.self).pointee = element
-    address?.assumingMemoryBound(to: T.self).pointee = element
+    } else {
+      size.pointee = 0
+    }
   }
   
   private func write<T: Any>(array arr: ContiguousArray<T>, address: UnsafeMutableRawPointer?, size: UnsafeMutablePointer<UInt32>, requestedSize: UInt32?) {

native/driver/Source/EQMPlugIn.swift

@@ -32,18 +32,7 @@ class EQMPlugIn: EQMObject {
 
   static func isPropertySettable (objectID: AudioObjectID? = nil, address: AudioObjectPropertyAddress) -> Bool {
     switch address.mSelector {
-    case kAudioObjectPropertyBaseClass,
+      default: return false
-         kAudioObjectPropertyClass,
-         kAudioObjectPropertyOwner,
-         kAudioObjectPropertyManufacturer,
-         kAudioObjectPropertyOwnedObjects,
-         kAudioPlugInPropertyBoxList,
-         kAudioPlugInPropertyTranslateUIDToBox,
-         kAudioPlugInPropertyDeviceList,
-         kAudioPlugInPropertyTranslateUIDToDevice,
-         kAudioPlugInPropertyResourceBundle,
-         kAudioObjectPropertyCustomPropertyInfoList: return true
-    default: return false
     }
   }
 
@@ -88,19 +77,35 @@ class EQMPlugIn: EQMObject {
       case kAudioObjectPropertyManufacturer:
         //  This is the human readable name of the maker of the plug-in.
         return .string(kDeviceManufacturer as CFString)
+
       case kAudioObjectPropertyOwnedObjects:
-        return .objectIDList([kObjectID_Box, kObjectID_Device])
+        var objects = ContiguousArray<AudioObjectID>()
+        objects.append(kObjectID_Box)
+        if EQMBox.acquired {
+          objects.append(kObjectID_Device)
+        }
+        return .objectIDList(objects)
+
       case kAudioPlugInPropertyBoxList:
         return .objectIDList([kObjectID_Box])
+
       case kAudioPlugInPropertyTranslateUIDToBox:
         let uid = inData?.assumingMemoryBound(to: CFString?.self).pointee
+
         if (CFStringCompare(uid, kBoxUID as CFString, .init(rawValue: 0)) == CFComparisonResult.compareEqualTo) {
           return .integer(kObjectID_Box)
         } else {
           return .integer(kAudioObjectUnknown)
         }
+        
       case kAudioPlugInPropertyDeviceList:
-        return .objectIDList([kObjectID_Device])
+        var devices = ContiguousArray<AudioObjectID>()
+
+        if EQMBox.acquired {
+          devices.append(kObjectID_Device)
+        }
+        return .objectIDList(devices)
+
       case kAudioPlugInPropertyTranslateUIDToDevice:
         //  This property takes the CFString passed in the qualifier and converts that
         //  to the object ID of the device it corresponds to. For this driver, there is

native/driver/Source/EQMStream.swift

@@ -72,7 +72,7 @@ class EQMStream: EQMObject {
     case kAudioStreamPropertyVirtualFormat,
          kAudioStreamPropertyPhysicalFormat: return sizeof(AudioStreamBasicDescription.self)
     case kAudioStreamPropertyAvailableVirtualFormats,
-         kAudioStreamPropertyAvailablePhysicalFormats: return 6 * sizeof(AudioStreamRangedDescription.self)
+         kAudioStreamPropertyAvailablePhysicalFormats: return UInt32(kSupportedSamplingRates.count) * sizeof(AudioStreamRangedDescription.self)
     default:
       return nil
     }