从iOS库中select音乐并发送/保存
我有一个关于音乐文件的查询。
我想从iPhone / iTouch / iPad的音乐库中select1个/多个音乐文件，并保存在我的文档文件夹中或发送到服务器。
我大致通过MPMediaPickerController和AddMusic（示例代码） 。 但是，我只能得到select歌曲和播放的细节。
是否可以保存这些选定的歌曲 ，我也可以用来发送到服务器？
谢谢
是否可以保存那些我也可以用来发送到服务器的歌曲？
不，您只能播放iTunes资料库中的歌曲。
原始audio文件不可访问，可能是由于版权保护。
对的，这是可能的。
我认为这会帮助你
// Have to add this framework //CoreMedia.framework //AudioToolbox.framework //CoreAudio.framework //MediaPlayer.framework //AVFoundation.framework //in UploadAudioViewController.h file #import <UIKit/UIKit.h> #import <CoreAudio/CoreAudioTypes.h> #import <AudioToolbox/AudioToolbox.h> #import <MediaPlayer/MediaPlayer.h> #import <AVFoundation/AVFoundation.h> #import <CoreMedia/CoreMedia.h> @interface UploadAudioViewController : UIViewController<UIActionSheetDelegate,UINavigationControllerDelegate,UIImagePickerControllerDelegate,MPMediaPickerControllerDelegate,AVAudioRecorderDelegate, AVAudioPlayerDelegate,AVAudioSessionDelegate>{ MPMediaItem *song; NSURL *exportURL; } @property (nonatomic, retain) NSData *audioData; // in UploadAudioViewController.m file #import "UploadAudioViewController.h" //#import < AudioToolbox/AudioToolbox.h> @interface UploadAudioViewController () @end @implementation UploadAudioViewController @synthesize musicPlayer,audioData; -(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } -(void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. self.title = @"Upload Audio"; self.musicPlayer = [MPMusicPlayerController iPodMusicPlayer]; self.audioData=nil; } #pragma mark Browse Audio from Device -(void)PickAudioForIndex_iPhone { if ([[[UIDevice currentDevice] model] isEqualToString:@"iPhone Simulator"]) { //device is simulator UIAlertView *alert1; alert1 = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"There is no Audio file in the Device" delegate:self cancelButtonTitle:nil otherButtonTitles:@"Ok",nil]; alert1.tag=2; [alert1 show]; //[alert1 release],alert1=nil; }else{ MPMediaPickerController *mediaPicker = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeMusic]; mediaPicker.delegate = self; mediaPicker.allowsPickingMultipleItems = NO; // this is the default [self presentViewController:mediaPicker animated:YES completion:nil]; } } #pragma mark Media picker delegate methods -(void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection { // We need to dismiss the picker [self dismissViewControllerAnimated:YES completion:nil]; // Assign the selected item(s) to the music player and start playback. if ([mediaItemCollection count] < 1) { return; } song = [[mediaItemCollection items] objectAtIndex:0]; [self handleExportTapped]; } -(void)mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker { // User did not select anything // We need to dismiss the picker [self dismissViewControllerAnimated:YES completion:nil ]; } -(void)handleExportTapped{ // get the special URL if (! song) { return; } //[self startLoaderWithLabel:@"Preparing for upload..."]; NSURL *assetURL = [song valueForProperty:MPMediaItemPropertyAssetURL]; AVURLAsset *songAsset = [AVURLAsset URLAssetWithURL:assetURL options:nil]; NSLog (@"Core Audio %@ directly open library URL %@", coreAudioCanOpenURL (assetURL) ? @"can" : @"cannot", assetURL); NSLog (@"compatible presets for songAsset: %@", [AVAssetExportSession exportPresetsCompatibleWithAsset:songAsset]); /* approach 1: export just the song itself */ AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset: songAsset presetName: AVAssetExportPresetAppleM4A]; NSLog (@"created exporter. supportedFileTypes: %@", exporter.supportedFileTypes); exporter.outputFileType = @"com.apple.m4a-audio"; NSString *exportFile = [myDocumentsDirectory() stringByAppendingPathComponent: @"exported.m4a"]; // end of approach 1 // set up export (hang on to exportURL so convert to PCM can find it) myDeleteFile(exportFile); //[exportURL release]; exportURL = [NSURL fileURLWithPath:exportFile]; exporter.outputURL = exportURL; // do the export [exporter exportAsynchronouslyWithCompletionHandler:^{ int exportStatus = exporter.status; switch (exportStatus) { case AVAssetExportSessionStatusFailed: { // log error to text view NSError *exportError = exporter.error; NSLog (@"AVAssetExportSessionStatusFailed: %@", exportError); //errorView.text = exportError ? [exportError description] : @"Unknown failure"; //errorView.hidden = NO; //[self stopLoader]; //[self showAlertWithMessage:@"There ia an error!"]; break; } case AVAssetExportSessionStatusCompleted: { NSLog (@"AVAssetExportSessionStatusCompleted"); //fileNameLabel.text = [exporter.outputURL lastPathComponent]; // set up AVPlayer //[self setUpAVPlayerForURL: exporter.outputURL]; ///////////////// get audio data from url //[self stopLoader]; //[self showAlertWithMessage:@"There ia an error!"]; NSURL *audioUrl = exportURL; NSLog(@"Audio Url=%@",audioUrl); self.audioData = [NSData dataWithContentsOfURL:audioUrl]; break; } case AVAssetExportSessionStatusUnknown: { NSLog (@"AVAssetExportSessionStatusUnknown"); //[self stopLoader]; //[self showAlertWithMessage:@"There ia an error!"]; break; } case AVAssetExportSessionStatusExporting: { NSLog (@"AVAssetExportSessionStatusExporting"); //[self stopLoader]; //[self showAlertWithMessage:@"There ia an error!"]; break; } case AVAssetExportSessionStatusCancelled: { NSLog (@"AVAssetExportSessionStatusCancelled"); //[self stopLoader]; //[self showAlertWithMessage:@"There ia an error!"]; break; } case AVAssetExportSessionStatusWaiting: { NSLog (@"AVAssetExportSessionStatusWaiting"); //[self stopLoader]; //[self showAlertWithMessage:@"There ia an error!"]; break; } default: { NSLog (@"didn't get export status"); //[self stopLoader]; //[self showAlertWithMessage:@"There ia an error!"]; break; } } }]; } #pragma mark conveniences NSString* myDocumentsDirectory(){ NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); return [paths objectAtIndex:0];; } void myDeleteFile (NSString* path){ if ([[NSFileManager defaultManager] fileExistsAtPath:path]) { NSError *deleteErr = nil; [[NSFileManager defaultManager] removeItemAtPath:path error:&deleteErr]; if (deleteErr) { NSLog (@"Can't delete %@: %@", path, deleteErr); } } } // generic error handler from upcoming "Core Audio" book (thanks, Kevin!) // if result is nonzero, prints error message and exits program. static void CheckResult(OSStatus result, const char *operation) { if (result == noErr) return; char errorString[20]; // see if it appears to be a 4-char-code *(UInt32 *)(errorString + 1) = CFSwapInt32HostToBig(result); if (isprint(errorString[1]) && isprint(errorString[2]) && isprint(errorString[3]) && isprint(errorString[4])) { errorString[0] = errorString[5] = '\''; errorString[6] = '\0'; } else // no, format it as an integer sprintf(errorString, "%d", (int)result); fprintf(stderr, "Error: %s (%s)\n", operation, errorString); exit(1); } #pragma mark core audio test BOOL coreAudioCanOpenURL (NSURL* url){ OSStatus openErr = noErr; AudioFileID audioFile = NULL; openErr = AudioFileOpenURL((__bridge CFURLRef) url, kAudioFileReadPermission , 0, &audioFile); if (audioFile) { AudioFileClose (audioFile); } return openErr ? NO : YES; } 我已经尝试并成功导出ipod库歌曲。 请在下面find我的代码：
extension AudioPostViewController: MPMediaPickerControllerDelegate { func mediaPicker(mediaPicker: MPMediaPickerController, didPickMediaItems mediaItemCollection: MPMediaItemCollection) { dismissViewControllerAnimated(true, completion: { print("You selected \(mediaItemCollection)") let item: MPMediaItem = mediaItemCollection.items[0] let pathURL: NSURL? = item.valueForProperty(MPMediaItemPropertyAssetURL) as? NSURL if pathURL == nil { Alert.showPopupWithMessage("Unable to read DRM protected file.") return } let title = item.valueForProperty(MPMediaItemPropertyTitle) as? String ?? "Now Playing..." print("\(pathURL), title : \(title) ") // get file extension andmime type let str = pathURL!.absoluteString let str2 = str.stringByReplacingOccurrencesOfString("ipod-library://item/item", withString: "") let arr = str2.componentsSeparatedByString("?") var mimeType = arr[0] mimeType = mimeType.stringByReplacingOccurrencesOfString(".", withString: "") // Export the ipod library as .m4a file to local directory for remote upload let exportSession = AVAssetExportSession(asset: AVAsset(URL: pathURL!), presetName: AVAssetExportPresetAppleM4A) exportSession?.shouldOptimizeForNetworkUse = true exportSession?.outputFileType = AVFileTypeAppleM4A FilePath.removeAudioFile() // Remove file if it exists let fileUrl = FilePath.testFilePathURL() exportSession?.outputURL = fileUrl exportSession?.exportAsynchronouslyWithCompletionHandler({ () -> Void in if exportSession!.status == AVAssetExportSessionStatus.Completed { dispatch_async(dispatch_get_main_queue(), { // Prepare audio to play self.audioTitle = title self.audioPath = fileUrl self.mimeType = "audio/m4a" self.audioFileName = "audio.m4a" UIView.animateWithDuration(0.45, animations: { if Platform.DeviceType.iPhone4 { self.libraryBottomSpacing.constant = 5 self.view.layoutIfNeeded() } else { self.libraryBottomSpacing.constant = 25 self.view.layoutIfNeeded() } }, completion: { (v: Bool) in self.loadJukeBox(self.audioPath!, title: title) }) }) } else { dispatch_async(dispatch_get_main_queue(), { Alert.showPopupWithMessage("Unable to read file as its DRM protected.") }) } }) }) } func mediaPickerDidCancel(mediaPicker: MPMediaPickerController) { dismissViewControllerAnimated(true, completion: nil) } }