Apple

An AVAudioPlayer can't play an item from the Media Library directly... the assetURL returned is not a file-system relative URL, it is more of a private reference to the media item and can only be played directly by an MPMediaPlayer. For use in an AVPlayer / AVAudioPlayer what you have to do is create an AVAssetExport session using that assetURL, which is then used to copy the file from the Media Library into your apps container i.e. your Documents or Temporary folder. Once that process is done you then load the asset from the copied files app-local URL. Take a look at 'TSLibraryImport' to see one example of how the file export / import can be done:

http://code.google.com/p/tslibraryimport/

HTH,

Mark Hill

MachineCodex Software

http://www.machinecodex.com

On 15/09/2012, at 6:40 PM, Richard Oths wrote:

Greetings.

Trying to use MPMediaPickerController to pass user-chosen song URL into AVAudioPlayer init. Code compiles but nothing plays. Is this even possible? Here's what I've got...

- (void)mediaPicker: (MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection
{

[self dismissModalViewControllerAnimated:YES];
if ([mediaItemCollection count] < 1) {
return;
}
//[song release];
song = [[mediaItemCollection items] objectAtIndex:0];
songLabel.hidden = NO;
artistLabel.hidden = NO;
imgButton.hidden = NO;
artwork = [song valueForProperty: MPMediaItemPropertyArtwork];
//coverArtView.hidden = NO;
songLabel.text = [song valueForProperty:MPMediaItemPropertyTitle];
artistLabel.text = [song valueForProperty:MPMediaItemPropertyArtist];
audioURL = [song valueForProperty:MPMediaItemPropertyAssetURL];
audioDuration = [song valueForProperty:MPMediaItemPropertyPlaybackDuration];
audioBPM = [song valueForProperty:MPMediaItemPropertyBeatsPerMinute];

//Play audio
NSString *resourcePath = [NSString stringWithFormat:@"%@",[audioURL absoluteString]];
NSData *soundData = [NSData dataWithContentsOfURL:audioURL];
audioPlayer = [[AVAudioPlayer alloc] initWithData:soundData error: nil];
audioPlayer=[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:resourcePath isDirectory:FALSE] error:nil];
//audioPlayer.delegate = self; <<I'll have to resolve this for as of now, MPMediaController is delegate, not AVAudioPlayer
[audioPlayer prepareToPlay];
[audioPlayer setVolume: 1.0];
[audioPlayer setDelegate: self];
[audioPlayer play];

Many thanks

References:
	>AVAudioPlayer with MPMediaItemPropertyAssetURL (From: Richard Oths <email@hidden>)