如何快速将 .caf 音频文件转换为 .mp4 文件 [英] How to convert .caf Audio file into .mp4 file in swift

问题描述

我正在使用带有 AVAudioRecorder 的设备麦克风录制音频，它返回 .caf 格式的文件，该文件只能在 Apple 设备上播放，而不能在 Android 设备上播放.由于 Apple 不支持 .mp3 文件，所以我想在上传到服务器之前将其转换为 .mp4 格式..mp4 是否仅适用于音频?我可以用 AVAssetExportSession 转换它吗?

I'm recording audio using device microphone with AVAudioRecorder which return file in .caf format that is playable only in Apple devices but not on Android devices. Since Apple is not supporting .mp3 file so I want to convert it in .mp4 format before uploading to server. Is .mp4 is good for audio only? Can I convert it with AVAssetExportSession ?

以下是录音机代码:

func setupAudioRecorder ()
    {

    let fileMgr = FileManager.default
    let dirPaths = fileMgr.urls(for:.documentDirectory,
                                in:.userDomainMask)

    let soundFileURL = dirPaths[0].appendingPathComponent("myaudio.caf")

    let recordSettings =
        [AVEncoderAudioQualityKey: AVAudioQuality.min.rawValue,
         AVEncoderBitRateKey: 16,
         AVNumberOfChannelsKey: 2,
         AVSampleRateKey: 44100.0] as [String : Any]

    do {
        try audioSession.setCategory(
            AVAudioSessionCategoryPlayAndRecord)
    } catch let error as NSError {
        print("audioSession error: \(error.localizedDescription)")
    }

    do {
        try audioRecorder = AVAudioRecorder(url: soundFileURL,
                                            settings: recordSettings as [String : AnyObject])
        audioRecorder?.prepareToRecord()
    } catch let error as NSError {
        print("audioSession error: \(error.localizedDescription)")
    }
}

推荐答案

经过大量搜索，我能够使用这段代码将 .caf 转换为 .mp4

After lot of search i am able to convert .caf into .mp4 using this piece of code

    let audioURL = ".caf audio file url"

    let fileMgr = FileManager.default

    let dirPaths = fileMgr.urls(for: .documentDirectory,
                                in: .userDomainMask)

    let outputUrl = dirPaths[0].appendingPathComponent("audiosound.mp4")

    let asset = AVAsset.init(url: audioURL)

    let exportSession = AVAssetExportSession.init(asset: asset, presetName: AVAssetExportPresetHighestQuality)

    // remove file if already exits
    let fileManager = FileManager.default
    do{
        try? fileManager.removeItem(at: outputUrl)

    }catch{
        print("can't")
    }


    exportSession?.outputFileType = AVFileTypeMPEG4

    exportSession?.outputURL = outputUrl

    exportSession?.metadata = asset.metadata

    exportSession?.exportAsynchronously(completionHandler: {
        if (exportSession?.status == .completed)
        {
            print("AV export succeeded.")

           // outputUrl to post Audio on server

        }
        else if (exportSession?.status == .cancelled)
        {
            print("AV export cancelled.")
        }
        else
        {
            print ("Error is \(String(describing: exportSession?.error))")

        }
    })

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