Question

func mergeAudioFiles(audioFileUrls: NSMutableArray,completion: @escaping (URL)-> Swift.Void) {

    let composition = AVMutableComposition()

    for i in 0 ..< audioFileUrls.count {

        let compositionAudioTrack :AVMutableCompositionTrack = composition.addMutableTrack(withMediaType: AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID())

        let asset = AVURLAsset(url: ((audioFileUrls[i] as! Dictionary<String, Any>)["soundURL"] as! URL))

        let track = asset.tracks(withMediaType: AVMediaTypeAudio)[0]

        let timeRange = CMTimeRange(start: CMTimeMake(0, 600), duration: CMTime(seconds: Double((audioFileUrls[i] as! Dictionary<String, Any>)["time"] as! CGFloat), preferredTimescale: track.timeRange.duration.timescale))

        try! compositionAudioTrack.insertTimeRange(timeRange, of: track, at: composition.duration)
    }



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

    let assetExport = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetAppleM4A)
    assetExport?.outputFileType = AVFileTypeAppleM4A
    assetExport?.outputURL = mergeAudioURL as URL
    removeFileAtURLIfExists(url: mergeAudioURL)
    assetExport?.exportAsynchronously(completionHandler:
        {
            switch assetExport!.status
            {
            case AVAssetExportSessionStatus.failed:
                print("failed \(String(describing: assetExport?.error))")
            case AVAssetExportSessionStatus.cancelled:
                print("cancelled \(String(describing: assetExport?.error))")
            case AVAssetExportSessionStatus.unknown:
                print("unknown\(String(describing: assetExport?.error))")
            case AVAssetExportSessionStatus.waiting:
                print("waiting\(String(describing: assetExport?.error))")
            case AVAssetExportSessionStatus.exporting:
                print("exporting\(String(describing: assetExport?.error))")
            default:
                print("-----Merge audio exportation complete.\(self.mergeAudioURL)")

                completion(self.mergeAudioURL)

            }
    })
}

所以我将用户按钮数据记录到字典数组中，字典有“soundURL” - 我根据按下哪个按钮传递声音的url，按下按钮的时间是“时间”，例如我开始录音并且用户在2.13秒后按下红色按钮会通过[“soundURL”：redURL，“time”：2：13]

代码中的问题是如果我非常快地点击按钮（如2秒内10次），它会创建10秒的音频文件，因为声音是1秒，我想要它做的是，最后的音频按下新按钮后应立即停止。所以它应该合并，就像不在一个queqe而是在一起

将多个音频合并为一个视频

0 个答案: