Question

I’ve got the following question to ask:

How do you compile taglib with an iOS application?

I’m a bit confused as I added the folder into my project, tried to compile it, but instead it failed with 1640 errors.

How do I make it successfully compile – the reason why I ask is taglib allows for the extraction of album artwork from a tag.

If anyone knows an Objective-C based album artwork extraction class it would help – I don’t know why Apple don’t add a way of doing this in Core Foundation – because there are methods for extracting some of the data from an ID3 tag.

I can’t see why there isn’t some Objective-C way of doing it.

Any help appreciated.

EDIT:

After hours upon hours of trying to do this, I’ve found a Java function here that seems to do the job fine, but I haven’t got a clue on how to convert it to Objective-C (or let alone C++ for that matter), as its types seem to be completely different from those that are in Objective-C/C++.

If anyone knows of a way to convert this it would really help, as this seems as my last option as I’ve tried so many others.

Answer 1

- (void)loadArtworksForFileAtPath:(NSString *)path completion:(void (^)(NSArray *))completion
{
    NSURL *u = [NSURL fileURLWithPath:path];
    AVURLAsset *a = [AVURLAsset URLAssetWithURL:u options:nil];
    NSArray *k = [NSArray arrayWithObjects:@"commonMetadata", nil];

    [a loadValuesAsynchronouslyForKeys:k completionHandler: ^{
        NSArray *artworks = [AVMetadataItem metadataItemsFromArray:a.commonMetadata
             withKey:AVMetadataCommonKeyArtwork keySpace:AVMetadataKeySpaceCommon];

         NSMutableArray *artworkImages = [NSMutableArray array];
         for (AVMetadataItem *i in artworks)
         {
             NSString *keySpace = i.keySpace;
             UIImage *im = nil;

             if ([keySpace isEqualToString:AVMetadataKeySpaceID3])
             {
                 NSDictionary *d = [i.value copyWithZone:nil];
                 im = [UIImage imageWithData:[d objectForKey:@"data"]];
             }
             else if ([keySpace isEqualToString:AVMetadataKeySpaceiTunes])
                 im = [UIImage imageWithData:[i.value copyWithZone:nil]];

             if (im)
                 [artworkImages addObject:im];
         }

         completion(artworkImages);
     }];
}