I have a simple AVAudioEngine graph as follows:
AVAudioPlayerNode -> AVAudioUnitEQ -> AVAudioUnitTimePitch -> AVAudioUnitReverb -> Main mixer node of AVAudioEngine.
I noticed that whenever I have AVAudioUnitTimePitch or AVAudioUnitVarispeed in the graph, I noticed a very distinct crackling/popping sound in my Airpods Pro 2 when starting up the engine and playing the AVAudioPlayerNode and unable to find the reason why this is happening. When I remove the node, the crackling completely goes away. How do I fix this problem since i need the user to be able to control the pitch and rate of the audio during playback.
import AVKit
@Observable @MainActor
class AudioEngineManager {
nonisolated private let engine = AVAudioEngine()
private let playerNode = AVAudioPlayerNode()
private let reverb = AVAudioUnitReverb()
private let pitch = AVAudioUnitTimePitch()
private let eq = AVAudioUnitEQ(numberOfBands: 10)
private var audioFile: AVAudioFile?
private var fadePlayPauseTask: Task<Void, Error>?
private var playPauseCurrentFadeTime: Double = 0
init() {
setupAudioEngine()
}
private func setupAudioEngine() {
guard let url = Bundle.main.url(forResource: "Song name goes here", withExtension: "mp3") else {
print("Audio file not found")
return
}
do {
audioFile = try AVAudioFile(forReading: url)
} catch {
print("Failed to load audio file: \(error)")
return
}
reverb.loadFactoryPreset(.mediumHall)
reverb.wetDryMix = 50
pitch.pitch = 0 // Increase pitch by 500 cents (5 semitones)
engine.attach(playerNode)
engine.attach(pitch)
engine.attach(reverb)
engine.attach(eq)
// Connect: player -> pitch -> reverb -> output
engine.connect(playerNode, to: eq, format: audioFile?.processingFormat)
engine.connect(eq, to: pitch, format: audioFile?.processingFormat)
engine.connect(pitch, to: reverb, format: audioFile?.processingFormat)
engine.connect(reverb, to: engine.mainMixerNode, format: audioFile?.processingFormat)
}
func prepare() {
guard let audioFile else { return }
playerNode.scheduleFile(audioFile, at: nil)
}
func play() {
DispatchQueue.global().async { [weak self] in
guard let self else { return }
engine.prepare()
try? engine.start()
DispatchQueue.main.async { [weak self] in
guard let self else { return }
playerNode.play()
fadePlayPauseTask?.cancel()
playPauseCurrentFadeTime = 0
fadePlayPauseTask = Task { [weak self] in
guard let self else { return }
while true {
let volume = updateVolume(for: playPauseCurrentFadeTime / 0.1, rising: true)
// Ramp up volume until 1 is reached
if volume >= 1 { break }
engine.mainMixerNode.outputVolume = volume
try await Task.sleep(for: .milliseconds(10))
playPauseCurrentFadeTime += 0.01
}
engine.mainMixerNode.outputVolume = 1
}
}
}
}
func pause() {
fadePlayPauseTask?.cancel()
playPauseCurrentFadeTime = 0
fadePlayPauseTask = Task { [weak self] in
guard let self else { return }
while true {
let volume = updateVolume(for: playPauseCurrentFadeTime / 0.1, rising: false)
// Ramp down volume until 0 is reached
if volume <= 0 { break }
engine.mainMixerNode.outputVolume = volume
try await Task.sleep(for: .milliseconds(10))
playPauseCurrentFadeTime += 0.01
}
engine.mainMixerNode.outputVolume = 0
playerNode.pause()
// Shut down engine once ramp down completes
DispatchQueue.global().async { [weak self] in
guard let self else { return }
engine.pause()
}
}
}
private func updateVolume(for x: Double, rising: Bool) -> Float {
if rising {
// Fade in
return Float(pow(x, 2) * (3.0 - 2.0 * (x)))
} else {
// Fade out
return Float(1 - (pow(x, 2) * (3.0 - 2.0 * (x))))
}
}
func setPitch(_ value: Float) {
pitch.pitch = value
}
func setReverbMix(_ value: Float) {
reverb.wetDryMix = value
}
}
struct ContentView: View {
@State private var audioManager = AudioEngineManager()
@State private var pitch: Float = 0
@State private var reverb: Float = 0
var body: some View {
VStack(spacing: 20) {
Text("🎵 Audio Player with Reverb & Pitch")
.font(.title2)
HStack {
Button("Prepare") {
audioManager.prepare()
}
Button("Play") {
audioManager.play()
}
.padding()
.background(Color.green)
.foregroundColor(.white)
.cornerRadius(10)
Button("Pause") {
audioManager.pause()
}
.padding()
.background(Color.red)
.foregroundColor(.white)
.cornerRadius(10)
}
VStack {
Text("Pitch: \(Int(pitch)) cents")
Slider(value: $pitch, in: -2400...2400, step: 100) { _ in
audioManager.setPitch(pitch)
}
}
VStack {
Text("Reverb Mix: \(Int(reverb))%")
Slider(value: $reverb, in: 0...100, step: 1) { _ in
audioManager.setReverbMix(reverb)
}
}
}
.padding()
}
}
