问题
I am trying to combine MicrophoneAnalysis and Recorder examples. It keeps crashing at the line try recorder.record.
2018-01-08 21:21:48.507019-0800 Music Practice[90266:18761122] [avae] AVAEInternal.h:70:_AVAE_Check: required condition is false: [AVAEGraphNode.mm:804:CreateRecordingTap: (nullptr == Tap())] 2018-01-08 21:21:48.527443-0800 Music Practice[90266:18761122] * Terminating app due to uncaught exception 'com.apple.coreaudio.avfaudio', reason: 'required condition is false: nullptr == Tap()' * First throw call stack:
// -----------
import AudioKit
import AudioKitUI
import UIKit
class SecondViewController: UIViewController {
@IBOutlet private var inputPlot: AKNodeOutputPlot!
@IBOutlet weak var tempViewForRecordingAndPlay: UIView!
@IBOutlet weak var outputWavePlot: AKOutputWaveformPlot!
// for microphone Analysis
@IBOutlet weak var frequencyLabel: UILabel!
@IBOutlet weak var amplitudeLabel: UILabel!
@IBOutlet weak var noteNameWithSharpsLabel: UILabel!
@IBOutlet weak var noteNameWithFlatsLabel: UILabel!
@IBOutlet private var audioInputPlot: EZAudioPlot!
var micMixer: AKMixer!
var recorder: AKNodeRecorder!
var player: AKAudioPlayer!
var tape: AKAudioFile!
var micBooster: AKBooster!
var moogLadder: AKMoogLadder!
var delay: AKDelay!
var mainMixer: AKMixer!
let mic = AKMicrophone()
var state = State.readyToRecord
@IBOutlet private weak var infoLabel: UILabel!
@IBOutlet private weak var resetButton: UIButton!
@IBOutlet private weak var RecordOrPlay_Btn: UIButton!
@IBOutlet private weak var frequencySlider: AKSlider!
@IBOutlet private weak var resonanceSlider: AKSlider!
@IBOutlet private weak var loopButton: UIButton!
@IBOutlet private weak var moogLadderTitle: UILabel!
enum State {
case readyToRecord
case recording
case readyToPlay
case playing
}
var plot: AKNodeOutputPlot!
var micNew: AKMicrophone!
var tracker: AKFrequencyTracker!
var silence: AKBooster!
let noteFrequencies = [16.35, 17.32, 18.35, 19.45, 20.6, 21.83, 23.12, 24.5, 25.96, 27.5, 29.14, 30.87]
let noteNamesWithSharps = ["C", "C♯", "D", "D♯", "E", "F", "F♯", "G", "G♯", "A", "A♯", "B"]
let noteNamesWithFlats = ["C", "D♭", "D", "E♭", "E", "F", "G♭", "G", "A♭", "A", "B♭", "B"]
@objc func updateUI() {
if tracker.amplitude > 0.1 {
frequencyLabel.text = String(format: "%0.1f", tracker.frequency)
var frequency = Float(tracker.frequency)
while frequency > Float(noteFrequencies[noteFrequencies.count - 1]) {
frequency /= 2.0
}
while frequency < Float(noteFrequencies[0]) {
frequency *= 2.0
}
var minDistance: Float = 10_000.0
var index = 0
for i in 0..<noteFrequencies.count {
let distance = fabsf(Float(noteFrequencies[i]) - frequency)
if distance < minDistance {
index = i
minDistance = distance
}
}
let octave = Int(log2f(Float(tracker.frequency) / frequency))
noteNameWithSharpsLabel.text = "\(noteNamesWithSharps[index])\(octave)"
noteNameWithFlatsLabel.text = "\(noteNamesWithFlats[index])\(octave)"
}
amplitudeLabel.text = String(format: "%0.2f", tracker.amplitude)
}
#if NOT_USED
func setupPlot() {
plot = AKNodeOutputPlot(micNew, frame: audioInputPlot.bounds)
plot.plotType = .rolling
plot.shouldFill = true
plot.shouldMirror = true
plot.color = UIColor.blue
audioInputPlot.addSubview(plot)
}
#endif
func setupPlot_forMic() {
plot = AKNodeOutputPlot(micMixer, frame: audioInputPlot.bounds)
plot.plotType = .rolling
plot.shouldFill = true
plot.shouldMirror = true
plot.color = UIColor.red
audioInputPlot.addSubview(plot)
}
func execute_viewDidAppear_micAnalysis() {
//AudioKit.output = silence
//AudioKit.start()
setupPlot_forMic()
Timer.scheduledTimer(timeInterval: 0.1,
target: self,
selector: #selector(SecondViewController.updateUI),
userInfo: nil,
repeats: true)
}
//view DID APPEAR
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
execute_viewDidAppear_micAnalysis()
}
// View DID DOWNLOAD
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.tempViewForRecordingAndPlay.addSubview(inputPlot);
self.tempViewForRecordingAndPlay.addSubview(outputWavePlot);
//parentView.bringSubview(toFront: childView)
tempViewForRecordingAndPlay.bringSubview(toFront: inputPlot);
tempViewForRecordingAndPlay.bringSubview(toFront: outputWavePlot);
recorderPlayerSettings()
#if TEMP
#else
micAnalysisSettings()
#endif
}
func recorderPlayerSettings() {
setupButtonNames()
// Clean tempFiles!
AKAudioFile.cleanTempDirectory()
// Session settings
AKSettings.bufferLength = .medium
do {
try AKSettings.setSession(category: .playAndRecord, with: .allowBluetoothA2DP)
} catch {
AKLog("Could not set session category.")
}
AKSettings.defaultToSpeaker = true
// Patching
inputPlot.node = mic
micMixer = AKMixer(mic)
micBooster = AKBooster(micMixer)
//play(from: innerTime, to: endTime, when: 0)
// passing 0 for endTime will use the duration.
// Will set the level of microphone monitoring
micBooster.gain = 0
recorder = try? AKNodeRecorder(node: micMixer)
if let file = recorder.audioFile {
player = try? AKAudioPlayer(file: file)
}
player.looping = true
player.completionHandler = playingEnded
moogLadder = AKMoogLadder(player)
mainMixer = AKMixer(moogLadder, micBooster)
AudioKit.output = mainMixer
AudioKit.start()
setupUIForRecording()
}
func micAnalysisSettings() {
AKSettings.audioInputEnabled = true
//micNew = AKMicrophone()
tracker = AKFrequencyTracker(micMixer)
//tracker = AKFrequencyTracker(mic)
silence = AKBooster(tracker, gain: 0)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// CallBack triggered when playing has ended
// Must be seipatched on the main queue as completionHandler
// will be triggered by a background thread
func playingEnded() {
DispatchQueue.main.async {
self.setupUIForPlaying ()
}
}
@IBAction func RecordOrPlay_BtnTouched(_ sender: UIButton) {
switch state {
case .readyToRecord :
infoLabel.text = "Recording"
RecordOrPlay_Btn.setTitle("Stop", for: .normal)
state = .recording
// microphone will be monitored while recording
// only if headphones are plugged
if AKSettings.headPhonesPlugged {
micBooster.gain = 1
}
do {
try recorder.record()
} catch { print("Errored recording.") }
case .recording :
// Microphone monitoring is muted
micBooster.gain = 0
do {
try player.reloadFile()
} catch { print("Errored reloading.") }
let recordedDuration = player != nil ? player.audioFile.duration : 0
if recordedDuration > 0.0 {
recorder.stop()
player.audioFile.exportAsynchronously(name: "TempTestFile.m4a",
baseDir: .documents,
exportFormat: .m4a) {_, exportError in
if let error = exportError {
print("Export Failed \(error)")
} else {
print("Export succeeded")
}
}
setupUIForPlaying ()
}
case .readyToPlay :
player.play()
infoLabel.text = "Playing..."
RecordOrPlay_Btn.setTitle("Stop", for: .normal)
state = .playing
case .playing :
player.stop()
setupUIForPlaying()
}
}
struct Constants {
static let empty = ""
}
func setupButtonNames() {
resetButton.setTitle(Constants.empty, for: UIControlState.disabled)
RecordOrPlay_Btn.setTitle(Constants.empty, for: UIControlState.disabled)
loopButton.setTitle(Constants.empty, for: UIControlState.disabled)
}
func setupUIForRecording () {
state = .readyToRecord
infoLabel.text = "Ready to record"
RecordOrPlay_Btn.setTitle("Record", for: .normal)
resetButton.isEnabled = false
resetButton.isHidden = true
micBooster.gain = 0
setSliders(active: false)
}
func setupUIForPlaying () {
let recordedDuration = player != nil ? player.audioFile.duration : 0
infoLabel.text = "Recorded: \(String(format: "%0.1f", recordedDuration)) seconds"
RecordOrPlay_Btn.setTitle("Play", for: .normal)
state = .readyToPlay
resetButton.isHidden = false
resetButton.isEnabled = true
setSliders(active: true)
frequencySlider.value = moogLadder.cutoffFrequency
resonanceSlider.value = moogLadder.resonance
}
func setSliders(active: Bool) {
loopButton.isEnabled = active
moogLadderTitle.isEnabled = active
frequencySlider.callback = updateFrequency
frequencySlider.isHidden = !active
resonanceSlider.callback = updateResonance
resonanceSlider.isHidden = !active
frequencySlider.range = 10 ... 2_000
moogLadderTitle.text = active ? "Moog Ladder Filter" : Constants.empty
}
@IBAction func loopButtonTouched(_ sender: UIButton) {
if player.looping {
player.looping = false
sender.setTitle("Loop is Off", for: .normal)
} else {
player.looping = true
sender.setTitle("Loop is On", for: .normal)
}
}
func updateFrequency(value: Double) {
moogLadder.cutoffFrequency = value
frequencySlider.property = "Frequency"
frequencySlider.format = "%0.0f"
}
func updateResonance(value: Double) {
moogLadder.resonance = value
resonanceSlider.property = "Resonance"
resonanceSlider.format = "%0.3f"
}
@IBAction func resetEverything(_ sender: Any) {
player.stop()
do {
try recorder.reset()
} catch { print("Errored resetting.") }
//try? player.replaceFile((recorder.audioFile)!)
setupUIForRecording()
}
// convert to a generic view animate function and dissociate from the button
@IBAction func animateButton(_ sender: UIButton) {
UIView.animate(withDuration: 0.5, delay: 0.0, options: UIViewAnimationOptions.curveEaseIn, animations: {
//Frame Option 1:
self.tempViewForRecordingAndPlay.frame = CGRect(x: self.tempViewForRecordingAndPlay.frame.origin.x, y: 20, width: self.tempViewForRecordingAndPlay.frame.width, height: self.tempViewForRecordingAndPlay.frame.height)
//Frame Option 2:
self.tempViewForRecordingAndPlay.center = CGPoint(x: self.view.frame.width / 2, y: self.view.frame.height / 4)
//self.tempViewForRecordingAndPlay.backgroundColor = .blue
},completion: { finish in
/*
UIView.animate(withDuration: 1, delay: 0.25,options: UIViewAnimationOptions.curveEaseOut,animations: {
self.tempViewForRecordingAndPlay.backgroundColor = .orange
self.tempViewForRecordingAndPlay.transform = CGAffineTransform(scaleX: 0.25, y: 0.25)
//self.animationButton.isEnabled = false // If you want to restrict the button not to repeat animation..You can enable by setting into true
},completion: nil)})
*/
UIView.animate(withDuration: 1.0, delay: 0.25, usingSpringWithDamping:
0.6, initialSpringVelocity: 0.3, options:
UIViewAnimationOptions.allowAnimatedContent, animations: { () -> Void in
//do actual move
self.tempViewForRecordingAndPlay.center = self.tempViewForRecordingAndPlay.center
}, completion: nil)})
}
回答1:
You probably already have a tap on the bus and you can not have another on the same bus.
Try to micMixer.outputNode.removeTap(onBus: 0) before You calling recorder.record().
来源：https://stackoverflow.com/questions/48161989/trying-to-combine-2-audiokit-examples-microphoneanalysis-and-recorder-crashes