added peak limiter to basic eq

Author: nodeful

native/app/Sandbox.playground/Contents.swift

@@ -2,125 +2,59 @@ import AVFoundation
 import PlaygroundSupport
 import AMCoreAudio
 
-var engine: AVAudioEngine?
+var engine = AVAudioEngine()
+// File
+let path = Bundle.main.path(forResource: "track", ofType: "mp3")!
+let url = URL(fileURLWithPath: path)
+let file = try! AVAudioFile(forReading: url)
+let fileFormat = file.processingFormat
+let frameCount = UInt32(file.length)
 
-func stopEngine () {
-  if (engine != nil) {
-    print("pausing")
-    engine!.pause()
-    print("paused, stopping")
-    engine!.stop()
-    print("stopped")
-//    engine = nil
-  }
-}
-func createEngine () {
-  stopEngine()
-  engine = AVAudioEngine()
-  // File
-  let path = Bundle.main.path(forResource: "track", ofType: "mp3")!
-  let url = URL(fileURLWithPath: path)
-  let file = try! AVAudioFile(forReading: url)
-  let fileFormat = file.processingFormat
-  let frameCount = UInt32(file.length)
-  
-  let buffer = AVAudioPCMBuffer(pcmFormat: fileFormat, frameCapacity: frameCount)!
-  try! file.read(into: buffer, frameCount: frameCount)
-  
-  let player = AVAudioPlayerNode()
-  
-  let eq = AVAudioUnitEQ(numberOfBands: 3)
-  eq.bypass = false
-  //eq.globalGain = -24
-  let gain = Float32(10)
-  let band1 = eq.bands[0]
-  band1.filterType = .parametric
-  band1.bandwidth = 0.5
-  band1.gain = gain
-  band1.frequency = 32.0
-  band1.bypass = false
-  
-  let band2 = eq.bands[1]
-  band2.filterType = .parametric
-  band2.bandwidth = 0.5
-  band2.gain = gain
-  band2.frequency = 64.0
-  band2.bypass = false
-  
-  let band3 = eq.bands[2]
-  band3.filterType = .parametric
-  band3.bandwidth = 0.5
-  band3.gain = gain
-  band3.frequency = 125.0
-  band3.bypass = false
-  
-  var varispeed = AVAudioUnitVarispeed()
-  engine!.attach(varispeed)
-  engine!.attach(player)
-  engine!.attach(eq)
-  varispeed.rate = 0.1
-  engine!.connect(player, to: varispeed, format: fileFormat)
-  engine!.connect(varispeed, to: eq, format: fileFormat)
-  engine!.connect(eq, to: engine!.mainMixerNode, format: fileFormat)
-  
-  var asbd = AudioStreamBasicDescription()
-  var propSize = UInt32(MemoryLayout<AudioStreamBasicDescription>.size)
-  AudioUnitGetProperty(engine!.outputNode.audioUnit!, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 0, &asbd, &propSize)
-  
-  print(asbd)
-  print(AVAudioFormat(streamDescription: &asbd))
-  
-  try! engine!.outputNode.auAudioUnit.setDeviceID(AudioDevice.defaultOutputDevice()!.id)
-  engine!.prepare()
-  try! engine!.start()
-  print(engine!)
-  
-  player.play()
-  player.scheduleBuffer(buffer, at: AVAudioTime(hostTime: 0), options:.loops, completionHandler: nil)
-}
+let buffer = AVAudioPCMBuffer(pcmFormat: fileFormat, frameCapacity: frameCount)!
+try! file.read(into: buffer, frameCount: frameCount)
 
-class EventListener: EventSubscriber {
-  var hashValue: Int = 1
-  init () {
-    NotificationCenter.defaultCenter.subscribe(
-      self,
-      eventType: AudioHardwareEvent.self,
-      dispatchQueue: DispatchQueue.main
-    )
-    NotificationCenter.defaultCenter.subscribe(
-      self,
-      eventType: AudioDeviceEvent.self,
-      dispatchQueue: DispatchQueue.main
-    )
-  }
-  
-  internal func eventReceiver(_ event: AMCoreAudio.Event) {
-    switch event {
-    case let event as AudioHardwareEvent:
-      switch event {
-      case .deviceListChanged(let added, let removed):
-        print(added, removed)
-        if removed.count > 0 && !removed[0].name.contains("CADefaultDeviceAggregate") || added.count > 0 && !added[0].name.contains("CADefaultDeviceAggregate") {
-          stopEngine()
-          DispatchQueue.main.asyncAfter(deadline: .now() + 1000 / 1000) {
-            print("Trying to start again")
-            createEngine()
-          }
-        }
-        
-      default: return
-      }
-    case let event as AudioDeviceEvent:
-      switch event {
-      case .isAliveDidChange(let device):
-        print("isAliveDidChange", device)
-      default:
-        return
-      }
-    default: return
-    }
-  }
-}
+let player = AVAudioPlayerNode()
 
-createEngine()
-let listener = EventListener()
+let eq = AVAudioUnitEQ(numberOfBands: 3)
+eq.bypass = false
+eq.globalGain = -16
+let gain = Float32(24)
+let band1 = eq.bands[0]
+band1.filterType = .parametric
+band1.bandwidth = 0.5
+band1.gain = gain
+band1.frequency = 32.0
+band1.bypass = false
+
+let band2 = eq.bands[1]
+band2.filterType = .parametric
+band2.bandwidth = 0.5
+band2.gain = gain
+band2.frequency = 64.0
+band2.bypass = false
+
+let band3 = eq.bands[2]
+band3.filterType = .parametric
+band3.bandwidth = 0.5
+band3.gain = gain
+band3.frequency = 125.0
+band3.bypass = false
+
+var varispeed = AVAudioUnitVarispeed()
+
+engine.attach(varispeed)
+engine.attach(player)
+engine.attach(eq)
+
+
+engine.connect(player, to: varispeed, format: fileFormat)
+engine.connect(varispeed, to: eq, format: fileFormat)
+engine.connect(eq, to: engine.mainMixerNode, format: fileFormat)
+
+try! engine.outputNode.auAudioUnit.setDeviceID(AudioDevice.defaultOutputDevice()!.id)
+engine.prepare()
+try! engine.start()
+print(engine)
+
+player.play()
+player.scheduleBuffer(buffer, at: AVAudioTime(hostTime: 0), options:.loops, completionHandler: nil)

native/app/Sandbox.playground/Resources/Mazde X LissA - 390.mp3

@@ -0,0 +1 @@
+Versions/Current/AudioKit

native/app/Sandbox.playground/Resources/track.mp3

@@ -0,0 +1 @@
+Versions/Current/Headers

native/app/Sandbox.playground/Sources/AudioKit.framework/AudioKit

@@ -0,0 +1 @@
+Versions/Current/Modules

native/app/Sandbox.playground/Sources/AudioKit.framework/Headers

@@ -0,0 +1 @@
+Versions/Current/Resources