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POExtracting ID3 tags from MP3 over HTTP Live Streaming
 

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  1. POExtracting ID3 tags from MP3 over HTTP Live Streaming
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    <p>I've been having quite a difficult time extracting ID3 information from an MP3 being streamed over Live HTTP Streaming (using the Wowza media server, if anyone is curious). I know that the tags (right now the album tag and the album artwork tag) are being properly embedded in each of the file segments because when I download them manually I can see them in each segment as listed in the <code>.m3u</code> index file generated by the server.</p> <p>I am using the <code>AVFoundation</code> classes to do this, and I have it setup as such:</p> <pre><code>- (void)initializeAudioStream { NSURL *streamUrl = [NSURL URLWithString:self.urlField.text]; AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:streamUrl]; self.musicPlayer = [AVPlayer playerWithPlayerItem:playerItem]; self.musicPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone; [self.musicPlayer addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:NULL]; } </code></pre> <p>Once my KVO method is triggered, I start playing <code>self.musicPlayer</code> and I call <code>addPeriodicTimeObserverForInterval</code> on it for each 1/4 second. It is in this method that I try to extract the ID3 metadata.</p> <p>I have tried everything I can think of on the iOS side of things to accomplish this, including printing out</p> <pre><code>self.musicPlayer.currentItem.asset.commonMetadata </code></pre> <p>as well as iterating over each of the <code>AVAssetTrack</code> instances and printing out <em>their</em> metadata.</p> <pre><code>for (AVAssetTrack *track in self.musicPlayer.currentItem.asset.tracks) { NSLog(@"Media type of track: %@", track.mediaType); NSLog(@"Track metadata: %@", track.commonMetadata); } </code></pre> <p>What's interesting is that the asset always says it has 2 tracks. When I print out their <code>mediaType</code> property I get "soun" for the first one and "tmet" for the second. My assumption is that the first track is the audio data itself and the second track is metadata. However, I only ever see an empty array in <code>commonMetadata</code>.</p> <p>I also check the status of the properties using <code>statusOfValueForKey:error</code> on the tracks, and the <code>commonMetadata</code> key always comes back as <code>AVKeyValueStatusLoaded</code>.</p> <p>Any ideas? I'm at a complete loss here.</p> <p>Also, I am currently running this through the iPhone 4 simulator running iOS 4.2.1. I can't yet put it on a device since Apple is still approving my company's developer account.</p>
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    1. COCan you supply the source code of the module to send metadata using id3 wowza library? In client side you catched the metadata using "timedMetadata"?
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