iOS AVFoundation: How do I fetch artwork from an mp3 file?

Question

My code:

- (void)metadata {
AVURLAsset *asset = [AVURLAsset URLAssetWithURL:self.fileURL options:nil];

NSArray *artworks = [AVMetadataItem metadataItemsFrom         


        

Answer 1

I just found the answer to that here: How can I extract metadata from mp3 file in ios development and was now looking to see why that code doesn't work on an m4a file. I took a little bit from your code and present the following which seems to work for both m4a and mp3. Note that I left the code which works for mp3 as an open else clause without the qualifier - if anybody gains more experience with this they are welcome to refine!

 - (void)getMetaDataForSong:(MusicItem *)musicItem {
   AVAsset *assest;

   // filePath looks something like this: /var/mobile/Applications/741647B1-1341-4203-8CFA-9D0C555D670A/Library/Caches/All Summer Long.m4a

    NSURL *fileURL = [NSURL fileURLWithPath:musicItem.filePath];
    NSLog(@"%@", fileURL);
    assest = [AVURLAsset URLAssetWithURL:fileURL    options:nil];
    NSLog(@"%@", assest);

    for (NSString *format in [assest availableMetadataFormats]) {
      for (AVMetadataItem *item in [assest metadataForFormat:format]) {
        if ([[item commonKey] isEqualToString:@"title"]) {
            musicItem.strSongTitle = (NSString *)[item value];
        } 
        if ([[item commonKey] isEqualToString:@"artist"]) {
            musicItem.strArtistName = (NSString *)[item value];
        }
        if ([[item commonKey] isEqualToString:@"albumName"]) {
          musicItem.strAlbumName = (NSString *)[item value];
        }
        if ([[item commonKey] isEqualToString:@"artwork"]) {
          UIImage *img = nil;
          if ([item.keySpace isEqualToString:AVMetadataKeySpaceiTunes]) {
            img = [UIImage imageWithData:[item.value copyWithZone:nil]];
          }
          else { // if ([item.keySpace isEqualToString:AVMetadataKeySpaceID3]) {
            NSData *data = [(NSDictionary *)[item value] objectForKey:@"data"];
            img = [UIImage imageWithData:data]  ;
          }
          musicItem.imgArtwork = img;
        }
     }
  }
}