嗨,我想附加语音文件。
我正在用AVAudioRecorder录制语音,但是要播放录音,我需要叫“停止”,但是在播放之后,我要继续录音。就像本地的iOS语音备忘录应用一样。
我应该使用AVMutableCompositionTrack吗?如何快速使用?谢谢!
如果您只是想暂停录音并在以后继续录音,可以使用AVAudioRecorder的pause()函数而不是stop(),当您再次使用play()时它将继续录音。
但是,如果您要实际连接音频文件,可以这样做:
func concatenateFiles(audioFiles: [NSURL], completion: (concatenatedFile: NSURL?) -> ()) {
guard audioFiles.count > 0 else {
completion(concatenatedFile: nil)
return
}
if audioFiles.count == 1 {
completion(concatenatedFile: audioFiles.first)
return
}
// Concatenate audio files into one file
var nextClipStartTime = kCMTimeZero
let composition = AVMutableComposition()
let track = composition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid)
// Add each track
for recording in audioFiles {
let asset = AVURLAsset(URL: NSURL(fileURLWithPath: recording.path!), options: nil)
if let assetTrack = asset.tracksWithMediaType(AVMediaTypeAudio).first {
let timeRange = CMTimeRange(start: kCMTimeZero, duration: asset.duration)
do {
try track.insertTimeRange(timeRange, ofTrack: assetTrack, atTime: nextClipStartTime)
nextClipStartTime = CMTimeAdd(nextClipStartTime, timeRange.duration)
} catch {
print("Error concatenating file - \(error)")
completion(concatenatedFile: nil)
return
}
}
}
// Export the new file
if let exportSession = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetPassthrough) {
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
let documents = NSURL(string: paths.first!)
if let fileURL = documents?.URLByAppendingPathComponent("file_name.caf") {
// Remove existing file
do {
try NSFileManager.defaultManager().removeItemAtPath(fileURL.path!)
print("Removed \(fileURL)")
} catch {
print("Could not remove file - \(error)")
}
// Configure export session output
exportSession.outputURL = NSURL.fileURLWithPath(fileURL.path!)
exportSession.outputFileType = AVFileTypeCoreAudioFormat
// Perform the export
exportSession.exportAsynchronouslyWithCompletionHandler() { handler -> Void in
if exportSession.status == .Completed {
print("Export complete")
dispatch_async(dispatch_get_main_queue(), {
completion(file: fileURL)
})
return
} else if exportSession.status == .Failed {
print("Export failed - \(exportSession.error)")
}
completion(concatenatedFile: nil)
return
}
}
}
}
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