Question

我正在使用AVAudioRecorder录制人声。我的代码如下：

// Property of Class
var recorder:AVAudioRecorder?

func recordButtonTapped() {
    let audioSession = AVAudioSession.sharedInstance()
    do {
        try audioSession.setCategory(AVAudioSessionCategoryRecord)
        try audioSession.setActive(true)
        if audioSession.recordPermission() != .granted {
            audioSession.requestRecordPermission({ (success) in
                self.startRecording()
            })
        }
        else {
            self.startRecording()
        }

    } catch {
        print("Unable To Set Category")
    }
}

func startRecording() {
    // libraryPathWith(media) just gets the path to the documents directory
    // Like so: Documents/MediaLibrary/Audio/<mediaID>.<mediaExtension>
    if let path = MMFileManager.libraryPathWith(media: self.media) {
        isRecording = true
        do {
            let settings = [
                AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
                AVSampleRateKey: 44100,
                AVNumberOfChannelsKey: 1,
                AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
            ]

            recorder = try AVAudioRecorder(url: path, settings: settings)

            recorder?.delegate = self

            if recorder!.prepareToRecord() {
                recorder?.record()
            }
        }
        catch {
            isRecording = false
        }
    }
}

func stopRecording() {
    self.recordingLabel.text = "Recording Complete"
    self.recordingLabel.textColor = UIColor.white
    if let rec = recorder {
        rec.stop()
        recorder = nil
    }
    isRecording = false
}

AVAudioRecorderDelegate

func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {
    print("RECORDED AUDIO SUCCESSFULLY \(flag)")
}
func audioRecorderEncodeErrorDidOccur(_ recorder: AVAudioRecorder, error: Error?) {
    print("AUDIO RECORDER ERROR \(error?.localizedDescription)")
}

在AVAudioRecorder上调用stop之后，audioRecorderEncodeErrorDidOccur函数永远不会被调用，但audioRecorderDidFinishRecording函数会执行，但flag始终为false。它打印出"RECORDED AUDIO SUCCESSFULLY false"

问题

当我使用上面的代码录制时，我确实将文件保存到指定位置的文档目录中。但是这个文件不是我可以玩的东西。它写入文本文件，而不是音频文件，因为我指定扩展名为.aac。

为什么AVAudioRecorder没有录制音频？我该怎么做呢？

Answer 1

我就是这样做的，先导入

AVFoundation

并将AVAudioRecorderDelegate添加到ViewController：

class RecordViewController: UIViewController, AVAudioRecorderDelegate

然后创建AVAudioRecorder的全局实例：

var audioRecorder : AVAudioRecorder!

然后我创建了一个开始录制的录制按钮：

@IBAction func playButton(_ sender: Any) {

    let dirPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
    let recordingName = "voiceRecording.wav"
    let pathArray = [dirPath, recordingName]
    let filePath = URL(string: pathArray.joined(separator: "/"))

    let session = AVAudioSession.sharedInstance()
    try! session.setCategory(AVAudioSessionCategoryPlayAndRecord, with: .defaultToSpeaker)

    try! audioRecorder = AVAudioRecorder(url: filePath!, settings: [:])
    audioRecorder.delegate = self
    audioRecorder.isMeteringEnabled = true
    audioRecorder.prepareToRecord()
    audioRecorder.record()
}

dirPath 找到存储图像的目录。

recordingName 将设置实际录制文件的名称

filepath 将最终位置的目录和recordingName组合在一起

其余的几乎是自我解释。

然后创建一个更简单的暂停按钮：

@IBAction func pauseButton(_ sender: Any) {

    audioRecorder.stop()
    let audioSession = AVAudioSession.sharedInstance()
    try! audioSession.setActive(false)
}

这应解决您录制音频的方式。

Answer 2

如果您确认自己的网址有“aac”扩展名，那么我怀疑您只是忘记在录制器上调用stop（）。这导致未完成的文件。

还在catch块中打印错误。

do{
    try throwingFunc()
} catch {
    print(error)
}

Answer 3

问题在于stopRecording()函数中的行。在致电stop()录音机的下方，我立即将AVAudioRecorder实例分配给nil。这可以在后期处理之前解除分配并结束AVAudioRecorder以创建可靠的.aac文件。

AVAudioRecorder永远不会记录

3 个答案: