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Constant MPMediaTypeMusic MPMediaTypePodcast
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Playing audio from the iPod library
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mediaPickerDidCancel: is called when the user presses the Cancel button in the toolbar. Typically, you want to hide the MPMediaPickerController from this method. When a media item has been selected, the mediaPicker:didPickMediaItems: method of the delegate automatically is called with an MPMediaItemCollection containing the selected item. An MPMediaItemCollection is a sorted set of MPMediaItems.
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12.1.2 Getting information about an MPMediaItem
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When you select an MPMediaItem from the iPod s media library, it comes with all the associated meta-information. To get access to this information, you call the valueForProperty: method of the MPMediaItem with a given key. The complete list of keys can be found in the API documentation for MPMediaItem. Table 12.2 provides a short list of some of the more common keys.
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Table 12.2 Common MPMediaItem keys Constant MPMediaItemPropertyMediaType Description Corresponds to one of the media types discussed in table 12.1 The title of the album that the media item belongs to The artist of the current media item An NSInteger that represents the length in seconds of the current media item The artwork image for the media item
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MPMediaItemPropertyAlbumTitle
MPMediaItemPropertyArtist MPMediaItemPropertyPlaybackDuration
MPMediaItemPropertyArtwork
Other properties you have access to include genre, composer, duration, track and disc number, album artwork, rating, lyrics, last played date, and play and skip counts. Now that you know how to select media items from the iPod library, playing these items is fairly easy.
12.1.3 Playing media items using MPMusicPlayerController
The class used to play media items is MPMusicPlayerController. It gives you total control over the built-in iPod on the device. When initializing a new MPMusicPlayerController, you have two options for interacting with the iPod. The first way limits the iPod playback to your application. When you choose this method of playback, the iPod will stop playing as soon as your application exits. The other allows you to invoke the global iPod application. Exiting your application won t cause the iPod to stop playing. The following code snippet details how to initialize the MPMusicPlayerController:
MPMusicPlayerController *player = [MPMusicPlayerController applicationMusicPlayer];
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By using the applicationMusicPlayer method of MPMusicPlayerController, you re limiting the media playback to your application. Using this method doesn t affect the device s iPod state in any way. If you want to use the main iPod application for media playback, you use the iPodMusicPlayer method. After you ve initialized the MPMusicPlayerController, you need to tell it which items you want it to play. You do so with the setQueueWithItemCollection: method. This method takes an MPMediaItemCollection as an argument. Conveniently enough, an MPMediaItemCollection is available to you when the MPMediaPickerController selects an item. Here s an example detailing how to set up the media player to play items selected from the user s media library:
- (void)mediaPicker: (MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection { [player setQueueWithItemCollection:mediaItemCollection]; }
After you set up the MPMusicPlayerController, quite a few settings are available to further control the iPod (see table 12.3).
Table 12.3 Common iPod control properties Description The current playback time in seconds. A reference to the currently playing item in the queue. The current playback state of the media player. The states are stopped, playing, paused, interrupted, seeking forward, and seeking backward. The repeat mode of the player. The repeat modes are default, none, one, and all. The shuffle mode of the player. The shuffle modes are default, off, songs, and albums. The volume of the player. This is a float value between 0.0 and 1.0.
Constant currentPlaybackTime nowPlayingItem playbackState
repeatMode
shuffleMode
volume
See the documentation for the names of the constants for playbackState, repeatMode, and shuffleMode. The MPMusicPlayerController provides a full set of methods that you d expect to control the playback of the iPod. Table 12.4 provides a complete list of these methods as well as their descriptions. As you can see, the API gives you quite a bit of control over the iPod. With all of these controls, you re able to create fully featured media playback applications. In the next section, we ll show you how to put it all together, and you ll create a simple media player application.
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