Question

我已经创建了下面的合并方法（加入，联合，我不确定哪个是正确的词，我想从2个或更多而不是一个接一个地制作1个音频但是一次播放每个音频）。作为输入，我有.wav格式的多个音频文件，我想要输出1 .wav格式。

_previous = dataTab

我的问题是它不起作用，我不知道为什么。我得到的错误：

错误域= AVFoundationErrorDomain代码= -11838“操作已停止” UserInfo = {NSLocalizedDescription =操作已停止， NSLocalizedFailureReason =不支持此操作介质。}）

当我将预设和输出类型更改为.m4a时，它正在工作，但我需要.wav。当我输入相同的格式时，应该使用.wav吗？谢谢你的帮助

Answer 1

如果您想将一个音频文件混合或重叠到另一个音频文件，那么您应该编写此代码，但是您只能生成.m4a文件而不是.wav文件。我使用.mp3文件作为输入文件。

在swift3中：

例如：

func playmerge(audio1: NSURL, audio2:  NSURL)
{
    let composition = AVMutableComposition()
    let compositionAudioTrack1:AVMutableCompositionTrack = composition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID())
    let compositionAudioTrack2:AVMutableCompositionTrack = composition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID())

    let documentDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! as NSURL
    self.fileDestinationUrl = documentDirectoryURL.appendingPathComponent("resultmerge.m4a")! as URL

    let filemanager = FileManager.default
    if (!filemanager.fileExists(atPath: self.fileDestinationUrl.path))
    {
        do
        {
            try filemanager.removeItem(at: self.fileDestinationUrl)
        }
        catch let error as NSError
        {
            NSLog("Error: \(error)")
        }

        if (theError == nil)
        {
            print("The music files has been Removed.")
        }
        else
        {
            print("Error")
        }
    }
    else
    {
        do
        {
            try filemanager.removeItem(at: self.fileDestinationUrl)
        }
        catch let error as NSError
        {
            NSLog("Error: \(error)")
        }

        if (theError == nil)
        {
            print("The music files has been Removed.")
        }
        else
        {
            print("Error")
        }
    }

    let url1 = audio1
    let url2 = audio2

    let avAsset1 = AVURLAsset(url: url1 as URL, options: nil)
    let avAsset2 = AVURLAsset(url: url2 as URL, options: nil)

    var tracks1 = avAsset1.tracks(withMediaType: AVMediaTypeAudio)
    var tracks2 = avAsset2.tracks(withMediaType: AVMediaTypeAudio)

    let assetTrack1:AVAssetTrack = tracks1[0]
    let assetTrack2:AVAssetTrack = tracks2[0]

    let duration1: CMTime = assetTrack1.timeRange.duration
    let duration2: CMTime = assetTrack2.timeRange.duration

    let timeRange1 = CMTimeRangeMake(kCMTimeZero, duration1)
    let timeRange2 = CMTimeRangeMake(kCMTimeZero, duration2)
    do
    {
        try compositionAudioTrack1.insertTimeRange(timeRange1, of: assetTrack1, at: kCMTimeZero)
        try compositionAudioTrack2.insertTimeRange(timeRange2, of: assetTrack2, at: kCMTimeZero)
    }
    catch
    {
        print(error)
    }

    let assetExport = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetAppleM4A)
    assetExport?.outputFileType = AVFileTypeAppleM4A
    assetExport?.outputURL = fileDestinationUrl
    assetExport?.exportAsynchronously(completionHandler:
        {
        switch assetExport!.status
        {
        case AVAssetExportSessionStatus.failed:
            print("failed \(assetExport?.error)")
        case AVAssetExportSessionStatus.cancelled:
            print("cancelled \(assetExport?.error)")
        case AVAssetExportSessionStatus.unknown:
            print("unknown\(assetExport?.error)")
        case AVAssetExportSessionStatus.waiting:
            print("waiting\(assetExport?.error)")
        case AVAssetExportSessionStatus.exporting:
            print("exporting\(assetExport?.error)")
        default:
            print("complete")
        }

        do
        {
            self.player = try AVAudioPlayer(contentsOf: self.fileDestinationUrl)
            self.player?.numberOfLoops = 0
            self.player?.prepareToPlay()
            self.player?.volume = 1.0
            self.player?.play()
            self.player?.delegate=self
        }
        catch let error as NSError
        {
            print(error)
        }
    })
}

Answer 2

请参阅this question，看起来这是自iOS 7以来的一个突出的错误。不幸的是，DTS提出的提交错误的建议似乎仍然适用。

您可以尝试使用AVAssetWriter导出，沿着代码行导出：Converting CAF to WAV。

iOS合并（混合）2个或更多音频文件到wav格式

2 个答案: