我尝试快速连接.wav音频文件。
这是我的代码:
func merge(audio1: NSURL, audio2: NSURL) { var error:NSError? var ok1 = false var ok2 = false var documentsDirectory:String = paths[0] as! String //Create AVMutableComposition Object.This object will hold our multiple AVMutableCompositionTrack. var composition = AVMutableComposition() var compositionAudioTrack1:AVMutableCompositionTrack = composition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID()) var compositionAudioTrack2:AVMutableCompositionTrack = composition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID()) //create new file to receive data 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 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 duration1: CMTime = assetTrack1.timeRange.duration var duration2: CMTime = assetTrack2.timeRange.duration var timeRange1 = CMTimeRangeMake(kCMTimeZero, duration1) var timeRange2 = CMTimeRangeMake(duration1, duration2) ok1 = compositionAudioTrack1.insertTimeRange(timeRange1, ofTrack: assetTrack1, atTime: kCMTimeZero, error: nil) if ok1 { ok2 = compositionAudioTrack2.insertTimeRange(timeRange2, ofTrack: assetTrack2, atTime: duration1, error: nil) if ok2 { println("success") } } //AVAssetExportPresetPassthrough => concatenation var assetExport = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetPassthrough) assetExport.outputFileType = AVFileTypeWAVE 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() } }) }
并在终端中运行此错误(在iPhone上运行):
文件:///var/mobile/Containers/Data/Application/3F49D360-B363-4600-B3BB- EE0810501910/Documents/resultmerge.wav
成功
失败,错误域= AVFoundationErrorDomain代码= -11838“操作中断” UserInfo = 0x174269ac0 {NSLocalizedDescription =操作中断,NSLocalizedFailureReason =希望操作的内容可以连续多次获得。}
但我不知道为什么会收到此错误。我将不胜感激您可以给我的任何帮助:)
我通过更改两件事使您的代码工作:
预设名称:从AVAssetExportPresetPassthrough到AVAssetExportPresetAppleM4A
AVAssetExportPresetPassthrough
AVAssetExportPresetAppleM4A
输出文件类型:从AVFileTypeWAVE到 AVFileTypeAppleM4A
AVFileTypeWAVE
AVFileTypeAppleM4A
assetExport像这样修改您的声明:
assetExport
var assetExport = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetAppleM4A) assetExport.outputFileType = AVFileTypeAppleM4A
那么它将正确合并文件。
看起来AVAssetExportSession仅导出M4A格式,而忽略其他预设。尽管我还没有探讨过这种可能性,但也许有一种方法可以使其导出其他格式(通过对它进行子类化?)。
AVAssetExportSession