拒绝电话呼叫时的 AVAudioSession 中断

Question

我知道关于 AVAudioSession 有类似的问题，但我的有点不同。 我遇到了 AVAudioSession 中断的问题。

电话被拒后，它会恢复，但它只保存中断后录制的部分 - 通话之前的部分会消失。

对于已接听的电话，即使 1 秒钟也可以正常工作 - 它会恢复并保存整个录音。

我注意到不同之处在于，当我接听电话时，.began 和 .ended 都被调用了两次，但当我拒绝来电时，它每次只调用一次。

开始录制：

func startRecording(name:String, quality:AudioQuality, progress:@escaping RecorderProgress, completed:@escaping RecorderCompletion, microphoneProgress:@escaping MicrophoneProgress) {
    log("Recorder - About to start recording")
    if isAudioRecordingGranted {
        self.device = EZMicrophone(microphoneDelegate: self, startsImmediately: true)
        self.name = name
        //Create the session.
        self.recorderProgress = progress
        self.recorderCompletion = completed
        self.microphoneProgress = microphoneProgress
        let session = AVAudioSession.sharedInstance()
        NotificationCenter.default.addObserver(self, selector: #selector(handleInterruption(notification:)), name: NSNotification.Name.AVAudioSessionInterruption, object: session)
        do {
            try session.setCategory(AVAudioSessionCategoryPlayAndRecord, with: .defaultToSpeaker)
            try session.setActive(true)
            let settings = [
                AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
                AVSampleRateKey: 44100,
                AVNumberOfChannelsKey: 2,
                AVEncoderAudioQualityKey: audioQuality.rawValue
            ]
            let audioFilename = Directory.documents.appendingPathComponent("\(self.name).m4a")
            audioRecorder = try AVAudioRecorder(url: audioFilename, settings: settings)
            audioRecorder.delegate = self
            audioRecorder.isMeteringEnabled = true
            audioRecorder.record()
            isRecording = true
            log("Recorder - Started recording, file at path: \(audioFilename.absoluteString)")
            meterTimer = Timer.scheduledTimer(timeInterval: 0.1, target:self, selector:#selector(update), userInfo:nil, repeats:true)
        }
        catch let error {
            completed(error, 0, 0)
            log("Recorder - Error occured while starting audio recording: \(error.localizedDescription)")
        }
    }
}

通知处理程序：

@objc func handleInterruption(notification: Notification) {
    guard let userInfo = notification.userInfo,
        let interruptionTypeRawValue = userInfo[AVAudioSessionInterruptionTypeKey] as? UInt,
        let interruptionType = AVAudioSessionInterruptionType(rawValue: interruptionTypeRawValue),
        let session = notification.object as? AVAudioSession else {
            log("Recorder - something went wrong")
            return
    }
    switch interruptionType {
    case .began:
        log("Recorder - interruption began")
        try! session.setActive(false)
        audioRecorder.pause()
    case .ended:
        try! session.setActive(true)
        log("Recorder - interruption ended")
    }
}

Answer 1

因此，我设法在使用 CallKit 和 CXCallObserver 委托函数 func callObserver(_ callObserver: CXCallObserver, callChanged call: CXCall) 直接从 AVAudioSession 暂停录音之前暂停录音。