Question

我试图在iOS中录制Opus格式。当我使用LinearPCM格式化测试记录器，即wav时，正确调用AVAudioRecorderDelegate函数和updateMeters，并且记录器URL在给定路径上保存有效文件。这是我用于重新编码的配置。

let fileMgr = FileManager.default
let dirPaths = fileMgr.urls(for: .documentDirectory,
                                in: .userDomainMask)
let soundFileURL = dirPaths[0].appendingPathComponent("audio.wav")
let recordSettings =
        [AVEncoderAudioQualityKey: AVAudioQuality.low.rawValue,
         AVEncoderBitRateKey: 16,
         AVNumberOfChannelsKey: 1,
         AVFormatIDKey : kAudioFormatLinearPCM,
         AVSampleRateKey: 44100.0] as [String : Any]

然后我尝试使用以下配置测试Opus，但是没有调用委托函数，米值是常数-160db（沉默）而audioRecorder url是nil因为我可以＆＃39;在委托函数中得到它：

func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {
    print(audioRecorder!.currentTime)
    self.audioFileUrl = audioRecorder!.url
}

我使用的Opus配置：

let soundFileURL = dirPaths[0].appendingPathComponent("audio.opus")
    let recordSettings =
        [AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue,
         AVEncoderBitRateKey: 16,
         AVNumberOfChannelsKey: 1,
         AVFormatIDKey : kAudioFormatOpus,
         AVSampleRateKey: 44100.0] as [String : Any]

如何正确设置配置以录制我的音频社交网络应用的Opus格式。什么是最好的30秒音频帖子上传和听取其他用户的一面。

Answer 1

以下用于重新编码Opus格式的配置有效。它不能在44100赫兹上工作。仅适用于16000或24000 Hz。

let recordSettings =
        [AVNumberOfChannelsKey: 1,
         AVFormatIDKey : kAudioFormatOpus,
         AVSampleRateKey: 24000.0] as [String : Any]

其他任何内容都没有更改，文件正确保存，现在也调用了didFinishRecoding。

Answer 2

试试这个：

var recordSettings = Dictionary() as [String: Any]
var audioRecorder: AVAudioRecorder?

func recordAudio() {
    let fileMgr = FileManager.default
    let dirPaths = fileMgr.urls(for: .documentDirectory,
                                in: .userDomainMask)
    let soundFileURL = dirPaths[0].appendingPathComponent("audio.wav")
    recordSettings =
        [AVEncoderAudioQualityKey: AVAudioQuality.low.rawValue,
         AVEncoderBitRateKey: 16,
         AVNumberOfChannelsKey: 1,
         AVFormatIDKey : kAudioFormatLinearPCM,
         AVSampleRateKey: 44100.0] as [String : Any]

    do {
        audioRecorder = try AVAudioRecorder(url: soundFileURL, settings: recordSettings)
    } catch {
        print(error.localizedDescription)
    }

    audioRecorder?.delegate = self
    audioRecorder?.prepareToRecord()

    // call record method when you want to start recording
    audioRecorder?.record()
}

func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {

    print(recorder.currentTime)
    do {
        audioPlayer = try AVAudioPlayer(contentsOf: recorder.url)
    } catch {
        print(error)
    }
    audioPlayer?.play()
}

当您想要停止录制时，需要致电audioRecorder?.stop()。它将以audioRecorderDidFinishRecording(_ recorder:方法为您提供回调。希望它有所帮助。

使用AVAudioRecorder iOS

2 个答案: