IOS 6 Convert MPMediaItem to NSData Issue

Question

I tried the code below.

-(void)mediaItemToData : (MPMediaItem * ) curItem { NSURL *url = [curItem valueForProperty: MPMediaItemPropertyAssetURL]; AVURLAsset *songAsset = [AVURLAsset URLAssetWithURL: url options:nil]; AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset: songAsset presetName:AVAssetExportPresetPassthrough]; exporter.outputFileType = @"public.mpeg-4"; NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString * myDocumentsDirectory = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; NSString *exportFile = [myDocumentsDirectory stringByAppendingPathComponent: @"exported.mp4"]; NSURL *exportURL = [NSURL fileURLWithPath:exportFile]; exporter.outputURL = exportURL; // do the export // (completion handler block omitted) [exporter exportAsynchronouslyWithCompletionHandler: ^{ NSData *data = [NSData dataWithContentsOfFile: [myDocumentsDirectory stringByAppendingPathComponent: @"exported.mp4"]]; DLog(@"Data %@",data); }]; } 

this code works fine in iOS 5, but now works in iOS 6.

Any changes for iOS6 in AVAssetExportPresetPassthrough . ???

Answer 1

I found a solution for iOS 6. Look below, change the code

 -(void)mediaItemToData : (MPMediaItem * ) curItem { NSURL *url = [curItem valueForProperty: MPMediaItemPropertyAssetURL]; AVURLAsset *songAsset = [AVURLAsset URLAssetWithURL: url options:nil]; AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset: songAsset presetName:AVAssetExportPresetAppleM4A]; exporter.outputFileType = @"com.apple.m4a-audio"; NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString * myDocumentsDirectory = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; [[NSDate date] timeIntervalSince1970]; NSTimeInterval seconds = [[NSDate date] timeIntervalSince1970]; NSString *intervalSeconds = [NSString stringWithFormat:@"%0.0f",seconds]; NSString * fileName = [NSString stringWithFormat:@"%@.m4a",intervalSeconds]; NSString *exportFile = [myDocumentsDirectory stringByAppendingPathComponent:fileName]; NSURL *exportURL = [NSURL fileURLWithPath:exportFile]; exporter.outputURL = exportURL; // do the export // (completion handler block omitted) [exporter exportAsynchronouslyWithCompletionHandler: ^{ int exportStatus = exporter.status; switch (exportStatus) { case AVAssetExportSessionStatusFailed: { NSError *exportError = exporter.error; NSLog (@"AVAssetExportSessionStatusFailed: %@", exportError); break; } case AVAssetExportSessionStatusCompleted: { NSLog (@"AVAssetExportSessionStatusCompleted"); NSData *data = [NSData dataWithContentsOfFile: [myDocumentsDirectory stringByAppendingPathComponent:fileName]]; //DLog(@"Data %@",data); data = nil; break; } case AVAssetExportSessionStatusUnknown: { NSLog (@"AVAssetExportSessionStatusUnknown"); break; } case AVAssetExportSessionStatusExporting: { NSLog (@"AVAssetExportSessionStatusExporting"); break; } case AVAssetExportSessionStatusCancelled: { NSLog (@"AVAssetExportSessionStatusCancelled"); break; } case AVAssetExportSessionStatusWaiting: { NSLog (@"AVAssetExportSessionStatusWaiting"); break; } default: { NSLog (@"didn't get export status"); break; } } }]; } 

See this link for more details.

Answer 2

@Hitarth SWIFT 3 Version

 func save(mediaItem: MPMediaItem) -> String? { let url = mediaItem.assetURL! let hex = MD5Hex(string: url.absoluteString) guard didMD5HexExist(string: hex) == false else { return hex } let songAsset = AVURLAsset(url: url) guard let exporter = AVAssetExportSession(asset: songAsset, presetName: AVAssetExportPresetAppleM4A) else { assertionFailure() return nil } exporter.outputFileType = "com.apple.m4a-audio" let fileHexName = hex + ".m4a" let fileURL = latFileManager.getResourceFolderPath().appendingPathComponent(fileHexName) DLog("fileURL: \(fileURL)") exporter.outputURL = fileURL // do the export exporter.exportAsynchronously { let status = exporter.status switch status { case .failed: assertionFailure(exporter.error as! String) case .completed: DLog("AVAssetExportSessionStatusCompleted") self.fileHexArray.append(fileHexName) default: DLog("default") break } } return hex } 

Answer 3

Try this, written in Swift4, and the reason for using AVAssetExportSession fooobar.com/questions/947658 / ...

 func mediaPicker(_ mediaPicker: MPMediaPickerController, didPickMediaItems mediaItemCollection: MPMediaItemCollection) { //get media item first guard let mediaItem = mediaItemCollection.items.first else { NSLog("No item selected.") return } let songUrl = mediaItem.value(forProperty: MPMediaItemPropertyAssetURL) as! URL print(songUrl) // get file extension andmime type let str = songUrl.absoluteString let str2 = str.replacingOccurrences( of : "ipod-library://item/item", with: "") let arr = str2.components(separatedBy: "?") var mimeType = arr[0] mimeType = mimeType.replacingOccurrences( of : ".", with: "") let exportSession = AVAssetExportSession(asset: AVAsset(url: songUrl), presetName: AVAssetExportPresetAppleM4A) exportSession?.shouldOptimizeForNetworkUse = true exportSession?.outputFileType = AVFileType.m4a //save it into your local directory let documentURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! let outputURL = documentURL.appendingPathComponent(mediaItem.title!) print(outputURL.absoluteString) //Delete Existing file do { try FileManager.default.removeItem(at: outputURL) } catch let error as NSError { print(error.debugDescription) } exportSession?.outputURL = outputURL exportSession?.exportAsynchronously(completionHandler: { () -> Void in if exportSession!.status == AVAssetExportSessionStatus.completed { print("Export Successfull") // self.getAudio() } self.dismiss(animated: true, completion: nil) }) }