How to merge audio

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Created Aug ’15

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The app that I'm creating I'm trying to combine two audio files, one is larger than the other, I need the first one to run for a certain time and then the second, but all as one audio (the audio is playing while app is in the background)

Here is what I got so far

func merge(audio1: NSURL, audio2:  NSURL, time:Double, date:NSDate) {
       
       
        var ok1 = false
        var ok2 = false
       
       
       /
       
        /
        var composition = AVMutableComposition()
        var compositionAudioTrack1:AVMutableCompositionTrack = composition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID())
        var compositionAudioTrack2:AVMutableCompositionTrack = composition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID())
       
        /
        var documentDirectoryURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first! as! NSURL
        var fileDestinationUrl = documentDirectoryURL.URLByAppendingPathComponent("resultmerge.wav")
        println(fileDestinationUrl)
       
       
        var url1 = audio1
        var url2 = audio2
       
        var avass = AV
        var avAsset1 = AVURLAsset(URL: url1, options: nil)
        var avAsset2 = AVURLAsset(URL: url2, options: nil)
       
        var tracks1 =  avAsset1.tracksWithMediaType(AVMediaTypeAudio)
        var tracks2 =  avAsset2.tracksWithMediaType(AVMediaTypeAudio)
       
        var assetTrack1:AVAssetTrack = tracks1[0] as! AVAssetTrack
        var assetTrack2:AVAssetTrack = tracks2[0] as! AVAssetTrack
       
        var seconds = CMTimeMakeWithSeconds(time, Int32())
      /
        var duration2: CMTime = assetTrack2.timeRange.duration
       
        var timeRange1 = CMTimeRangeMake(kCMTimeZero, seconds)
        var timeRange2 = CMTimeRangeMake(seconds, duration2)
       
       
        ok1 = compositionAudioTrack1.insertTimeRange(timeRange1, ofTrack: assetTrack1, atTime: kCMTimeZero, error: nil)
        if ok1 {
           
            ok2 = compositionAudioTrack2.insertTimeRange(timeRange2, ofTrack: assetTrack2, atTime: seconds, error: nil)
           
            if ok2 {
                println("success")
            }
        }
       
        /
        var assetExport = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetAppleM4A)
        assetExport.outputFileType = AVFileTypeAppleM4A
     
        assetExport.outputURL = fileDestinationUrl
        assetExport.exportAsynchronouslyWithCompletionHandler({
            switch assetExport.status{
            case  AVAssetExportSessionStatus.Failed:
                println("failed \(assetExport.error)")
            case AVAssetExportSessionStatus.Cancelled:
                println("cancelled \(assetExport.error)")
            default:
                println("complete")
                var audioPlayer = AVAudioPlayer()
                audioPlayer = AVAudioPlayer(contentsOfURL: fileDestinationUrl, error: nil)
                audioPlayer.prepareToPlay()
                audioPlayer.play()
            }
           
        })
       
    }

Is this the ideal way to do it? Also how do I convert mp3/m4a files into NSUrl's , I have local sound files that I need to convert into NSUrl for the function to work, how would i do that?

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