crash App iOS flutter when I use shazamkit package - ios

Question

I am using shazamkit package to recognize sound in flutter. android version works perfect but in iOS version when I start to use get this error:
ERROR: [0x190bf000] >avae> AVAudioNode.mm:568: CreateRecordingTap: required condition is false: IsFormatSampleRateAndChannelCountValid(format)
*** Terminating app due to uncaught exception 'com.apple.coreaudio.avfaudio', reason: 'required condition is false: IsFormatSampleRateAndChannelCountValid(format)'
this is my swift code :
import Flutter
import UIKit
import ShazamKit
import AudioToolbox
public class SwiftFlutterShazamKitPlugin: NSObject, FlutterPlugin {
private var session: SHSession?
private let audioEngine = AVAudioEngine()
private let playerNode = AVAudioPlayerNode()
private let mixerNode = AVAudioMixerNode()
private var callbackChannel: FlutterMethodChannel?
private var sampleRate = 44800
public static func register(with registrar: FlutterPluginRegistrar) {
let channel = FlutterMethodChannel(name: "flutter_shazam_kit", binaryMessenger: registrar.messenger())
let instance = SwiftFlutterShazamKitPlugin(callbackChannel: FlutterMethodChannel(name: "flutter_shazam_kit_callback", binaryMessenger: registrar.messenger()))
registrar.addMethodCallDelegate(instance, channel: channel)
}
init(callbackChannel: FlutterMethodChannel? = nil) {
self.callbackChannel = callbackChannel
}
public func handle(_ call: FlutterMethodCall, result: #escaping FlutterResult) {
switch call.method {
case "configureShazamKitSession":
let args = call.arguments as! Dictionary<String, Any>
configureShazamKitSession(
customCatalogPath: args["customCatalogPath"] as? String,
sampleRate: args["sampleRate"] as! Int
)
result(nil)
case "startDetectionWithMicrophone":
do{
configureAudio()
try startListening(result: result)
}catch{
callbackChannel?.invokeMethod("didHasError", arguments: error.localizedDescription)
}
case "endDetectionWithMicrophone":
stopListening()
result(nil)
case "endSession":
session = nil
result(nil)
default:
result(nil)
}
}
}
//MARK: ShazamKit session delegation here
//MARK: Methods for AVAudio
extension SwiftFlutterShazamKitPlugin {
func configureShazamKitSession(customCatalogPath: String?, sampleRate: Int) {
self.sampleRate = sampleRate
do {
if session == nil {
if (customCatalogPath == nil) {
session = SHSession()
} else {
let documentsUrl = FileManager.default.urls(
for: .documentDirectory,
in: .userDomainMask
).first!
let catalog = SHCustomCatalog()
try catalog.add(from: URL(fileURLWithPath: customCatalogPath!))
session = SHSession(catalog: catalog)
}
session?.delegate = self
}
} catch let error {
callbackChannel?.invokeMethod("didHasError",
arguments: "configureShazamKitSession() failed")
}
}
func addAudio(buffer: AVAudioPCMBuffer, audioTime: AVAudioTime) {
// Add the audio to the current match request
session?.matchStreamingBuffer(buffer, at: audioTime)
}
func configureAudio() {
playerNode.stop()
audioEngine.stop()
let inputFormat = audioEngine.inputNode.inputFormat(forBus: 0)
// Set an output format compatible with ShazamKit.
let outputFormat = AVAudioFormat(standardFormatWithSampleRate: Double(sampleRate), channels: 1)
// Create a mixer node to convert the input.
audioEngine.attach(mixerNode)
// Attach the mixer to the microphone input and the output of the audio engine.
audioEngine.connect(audioEngine.inputNode, to: mixerNode, format: inputFormat)
// audioEngine.connect(mixerNode, to: audioEngine.outputNode, format: outputFormat)
// Install a tap on the mixer node to capture the microphone audio.
mixerNode.installTap(onBus: 0,
bufferSize: 8192,
format: outputFormat) { buffer, audioTime in
// Add captured audio to the buffer used for making a match.
self.addAudio(buffer: buffer, audioTime: audioTime)
}
}
func startListening(result: FlutterResult) throws {
guard session != nil else{
callbackChannel?.invokeMethod("didHasError", arguments: "ShazamSession not found, please call configureShazamKitSession() first to initialize it.")
result(nil)
return
}
callbackChannel?.invokeMethod("detectStateChanged", arguments: 1)
// Throw an error if the audio engine is already running.
guard !audioEngine.isRunning else {
callbackChannel?.invokeMethod("didHasError", arguments: "Audio engine is currently running, please stop the audio engine first and then try again")
return
}
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.setCategory(AVAudioSession.Category.playAndRecord, mode: AVAudioSession.Mode.measurement, options: AVAudioSession.CategoryOptions.defaultToSpeaker)
try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
} catch {
print("audioSession properties weren't set because of an error.")
delegate?.showFeedbackError(title: "Sorry", message: "Mic is busy")
return false
}
// Ask the user for permission to use the mic if required then start the engine.
try audioSession.setCategory(.playAndRecord)
audioSession.requestRecordPermission { [weak self] success in
guard success else {
self?.callbackChannel?.invokeMethod("didHasError", arguments: "Recording permission not found, please allow permission first and then try again")
return
}
do{
self?.audioEngine.prepare()
try self?.audioEngine.start()
}catch{
self?.callbackChannel?.invokeMethod("didHasError", arguments: "Can't start the audio engine")
}
}
result(nil)
}
func stopListening() {
callbackChannel?.invokeMethod("detectStateChanged", arguments: 0)
// Check if the audio engine is already recording.
mixerNode.removeTap(onBus: 0)
audioEngine.stop()
}
}
//MARK: Delegate methods for SHSession
extension SwiftFlutterShazamKitPlugin: SHSessionDelegate{
public func session(_ session: SHSession, didFind match: SHMatch) {
var mediaItems: [[String: Any]] = []
match.mediaItems.forEach { rawItem in
var item: [String : Any] = [:]
var count: UInt32 = 0
let properties = class_copyPropertyList(class_getSuperclass(rawItem.classForCoder), &count)
for i in 0..<count {
guard let property = properties?[Int(i)] else { continue }
let name = String(cString: property_getName(property))
if (name == "properties") {
let props = rawItem.value(forKey: name) as! NSDictionary
for property in props.allKeys {
let prop = property as! String
var val = props.value(forKey: prop)!
if (String(describing: type(of: val)) == "__NSTaggedDate") {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
val = dateFormatter.string(from: val as! Date)
}
item[prop] = val
}
}
}
mediaItems.append(item)
free(properties)
}
do {
let jsonData = try JSONSerialization.data(withJSONObject: mediaItems)
let jsonString = String(data: jsonData, encoding: .utf8)
self.callbackChannel?.invokeMethod("matchFound", arguments: jsonString)
} catch {
callbackChannel?.invokeMethod("didHasError", arguments: "Error when trying to format data, please try again")
}
}
public func session(_ session: SHSession, didNotFindMatchFor signature: SHSignature, error: Error?) {
callbackChannel?.invokeMethod("notFound", arguments: nil)
callbackChannel?.invokeMethod("didHasError", arguments: error?.localizedDescription)
}
}
Your help is greatly appreciated
https://pub.dev/packages/flutter_shazam_kit