Hi everyone, I was working on some code that involves recording audio with AVAudioEngine and got an issue that just crashes the app:
EXC_BREAKPOINT
Exception 6, Code 1, Subcode 4304279688
+0x009888 AudioRecordModule.setupAudioEngine
+0x009788
AudioRecordModule.setupAudioEngine
+0x00c5bc
AudioRecordModule.handleConfigurationChange
Below is the relevant code in the Recorder class.
public class AudioRecordModule: Module {
private var audioEngine: AVAudioEngine?
private func startRecording(options recordingOptions: RecordingOptions) {
try AVAudioSession.sharedInstance().setCategory(.playAndRecord, options: .mixWithOthers)
try AVAudioSession.sharedInstance().setActive(true)
outputFormat = AVAudioFormat(
commonFormat: recordingOptions.bitDepth == 32 ? .pcmFormatInt32 : .pcmFormatInt16,
sampleRate: Double(recordingOptions.sampleRate),
channels: AVAudioChannelCount(recordingOptions.channels),
interleaved: true
)!
let fileUri = URL(string: recordingOptions.fileUri)!
let formatSettings: [String: Any] = [
AVFormatIDKey: kAudioFormatMPEG4AAC,
AVSampleRateKey: recordingOptions.sampleRate,
AVNumberOfChannelsKey: recordingOptions.channels,
AVEncoderBitRateStrategyKey: AVAudioBitRateStrategy_Constant,
AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue,
]
self.recordedFile = try AVAudioFile(
forWriting: fileUri,
settings: formatSettings,
commonFormat: outputFormat.commonFormat,
interleaved: outputFormat.isInterleaved
)
if !hadSetupNotification {
setupNotifications()
}
}
func handleConfigurationChange() {
DispatchQueue.main.async {
self.releaseAudioEngine()
self.setupAudioEngine()
if self.state == "recording" {
// we could attempt to keep recording
do {
try self.audioEngine?.start()
} catch {
self.internalPauseRecording()
self.sendInterruptEvent()
}
}
}
}
func setupNotifications() {
nc.addObserver(
forName: Notification.Name.AVAudioEngineConfigurationChange,
object: nil,
queue: nil
) { [weak self] _ in
guard let weakself = self else {
return
}
if weakself.state != "inactive" {
weakself.handleConfigurationChange()
}
}
}
private func setupAudioEngine() {
self.audioEngine = nil
let audioEngine = AVAudioEngine()
self.audioEngine = audioEngine
let inputNode = audioEngine.inputNode
let inputFormat = inputNode.inputFormat(forBus: 0)
let converter = AVAudioConverter(from: inputFormat, to: outputFormat)!
inputNode.installTap(onBus: 0, bufferSize: 1024, format: inputFormat) {
(buffer: AVAudioPCMBuffer!, time: AVAudioTime!) -> Void in
do {
let inputBlock: AVAudioConverterInputBlock = { _, outStatus in
outStatus.pointee = AVAudioConverterInputStatus.haveData
return buffer
}
let frameCapacity =
AVAudioFrameCount(self.outputFormat.sampleRate) * buffer.frameLength
/ AVAudioFrameCount(buffer.format.sampleRate)
let outputBuffer = AVAudioPCMBuffer(
pcmFormat: self.outputFormat,
frameCapacity: frameCapacity
)!
var error: NSError?
converter.convert(to: outputBuffer, error: &error, withInputFrom: inputBlock)
if let error = error {
throw error
} else {
try self.recordedFile?.write(from: outputBuffer)
}
} catch {
print(error)
}
}
}
private func releaseAudioEngine() {
if let audioEngine = self.audioEngine {
audioEngine.inputNode.removeTap(onBus: 0)
audioEngine.stop()
}
audioEngine = nil
}
}
Beside that, the record module works normally. It is just the configuration change that it does not handle well.
I understand that when configuration changes, I need to reinit the audio engine to have the correct input format (since the new config/audio device can have different sample rate and such). If I don't do that, the app also crashes perhaps due to the mismatch.
AVAudioRecorder is not an option for me.
Thank you for your help.
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