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    <p>Well, this took me a good few hours to find! Be prepared, it's not as simple as just using <code>MPMediaQuery</code>.</p> <h2>Overview</h2> <p>The data you need isn't easily accessible via the standard channels (i.e There is no pre-defined key in the MediaPlayer or AVFoundation frameworks to access this metadata). It is available via most ID3 tag editors, under the name <code>ITUNESADVISORY</code>. This tag can take 3 values:</p> <blockquote> <p>0 - No advisory information</p> <p>1 - Explicit</p> <p>2 - Clean</p> </blockquote> <p>This is what we're looking for, but how do we access it. The <code>MediaPlayer</code> framework is fairly high level, which means that we are limited in what data we can access/use. In order to look more deeply at a media file, we need to use <code>AVFoundation</code> framework as well.</p> <h2>How-to</h2> <p>I don't know what exact workflow you're using, but I hope you can adapt this to your needs. In order to determine whether a media file is explicit/clean or otherwise, I did as follows:</p> <ol> <li><p>I needed to get a hold of a <code>MPMediaItem</code> containing the file I want to inspect. I did this using <code>MPMediaPickerController</code>, presenting it, and retrieved the selected media items through its delegate method:</p> <pre><code>- (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection { // Do whatever is appropriate in your case to extract the media items MPMediaItem* item = [mediaItemCollection.items objectAtIndex:...]; .... } </code></pre></li> <li><p>Once I have my <code>MPMediaItem</code>, I need to get the equivalent <code>AVAsset</code> so I can work with the <code>AVFoundation</code> framework. To do this, I can use the URL path from the media item to create the asset.</p> <pre><code>MPMediaItem* item = ...; NSURL* path = [item valueForProperty:MPMediaItemPropertyAssetURL]; // We have to check if a path exists, because a media item may not be present on the device. Blame iTunes Match. if (path) { AVAsset* asset = [AVAsset assetWithURL:path]; .... </code></pre></li> <li><p>Once we have our asset, we need to get the metadata from it. From experimentation, this is iTunes metadata. As such, lets extract it from our asset.</p> <pre><code>NSArray* metadata = [asset metadataForFormat:AVMetadataFormatiTunesMetadata]; </code></pre></li> <li><p>This is where the fun, undocumented work begins. We now have to find the correct metadata item for what we want. As the advisory key is not declared as a constant in any of Apple's documentation, after a lot of trial and error, I've found it to be <code>1920233063</code>.</p> <p>To get the correct metadata item, we need to perform a filter on the metadata array, as so:</p> <pre><code>NSUInteger advisoryIndex = [metadata indexOfObjectPassingTest:^BOOL(id obj, NSUInteger idx, BOOL *stop) { if ([obj isKindOfClass:[AVMetadataItem class]]) { AVMetadataItem* metaItem = (AVMetadataItem*)obj; NSNumber* advisoryKeyTest = @(1920233063); if ([metaItem.key isEqual:advisoryKeyTest]) { *stop = YES; return YES; } return NO; } return NO; }]; </code></pre></li> <li><p>Once we've done that, then we need to determine what it is. This is relatively simple, and can be adapted to your own needs. I've just written a simple switch statement that says what type the song/media is. (<strong>Remember:</strong> It's entirely possible the media file doesn't include an advisory tag, so we have to check whether the index exists or not)</p> <pre><code>if (advisoryIndex != NSNotFound) { AVMetadataItem* metaItem = [metadata objectAtIndex:advisoryIndex]; NSInteger advisoryValue = [metaItem.numberValue integerValue]; switch (advisoryValue) { case 0: NSLog(@"%@", @"Unspecified"); break; case 1: NSLog(@"%@", @"Explicit"); break; case 2: NSLog(@"%@", @"Clean"); break; default: NSLog(@"%@", @"Unexpected Value"); break; } } </code></pre></li> </ol> <h2>Conclusion</h2> <p>And there you have it, a way to determine whether a song is clean or explicit, or neither. Because this is using a static number to find the advisory data, and is not linked to any constant defined in Apple's headers, I can not guarantee that this will work for all iOS versions in the past, present and future. I have tested this on iOS 6, and it seemed to be ok. Your milage may vary.</p> <p>It's a shame Apple don't provide this functionality out of the box (even if they just provided the Advisory Key). This functionality could be placed within a Category, if you so desire.</p>
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    1. COWow, thank you so much for solving this. I think you must be the only person to have found this out as in all my searching I couldn't find anyone who'd done it. Much appreciated!
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    2. COTook a lot of digging around, and sacrificing some of my music to make them clean/explicit(!), but I'm glad I was able to help :)
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    3. CO@Adam Are you using iTunes Match, or re-encoding the music for the device when syncing?
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