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Media: audio and recording
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This chapter covers
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Accessing the iPod library to play music Recording audio from the built-in microphone Playing sounds Recording, playing, and accessing video
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In the previous chapter, we discussed the basics of images. This chapter will detail how to play and record various types of audio and video. This will include how to play back audio items in the user s iPod library as well as how to record to and play from the user s video library. To further demonstrate these concepts, you ll create two sample applications. The first application is a simple media player that lets the user choose a song from their iPod library and play it back within the application. The next will be a simple recording and playback application that lets the user record audio of an arbitrary length and play it back.
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Playing audio from the iPod library
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12.1 Playing audio from the iPod library
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When Apple first released the iPhone SDK, the company provided complete access to the photo library but left out a huge piece of media stored on the iPhone: the iPod music library. Many people bought their fancy new iPhones for the sole purpose of combining their electronics (cell phone, iPod, GPS, and so on), and for Apple to leave out this access was quite a surprise to developers. Apple saw the need for such control within an application and added some new classes to the Media Player framework to allow you to retrieve items from the iPod media library as well as play them. There are many reasons why you d want to have control over the iPod in your applications. You may want to allow the user to use their personal music instead of your game music, or you may want to create a Name That Tune sort of game that uses songs from the user s iPod library. Apple has now made it simple to access and play these items. We ll look at how to retrieve items from the media library, how to get information about an item, and how to play an item, and we ll put it all together in a concrete example at the end of the section.
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12.1.1 Retrieving audio items from the iPod media library
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Retrieving items from the iPod media library is similar to retrieving photos from the photo library. The process is as follows:
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Display the MPMediaPickerController in the current view. Select media items from the iPod library. A callback method in the MPMediaPickerControllerDelegate is called with the media items.
The following example demonstrates how to display the MPMediaPickerController to select media items:
MPMediaPickerController *picker = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeMusic]; [picker setDelegate:self]; [self presentModalViewController:picker animated:YES];
One improvement the MPMediaPickerController has over the UIImagePickerController is that it allows you to select multiple items. To enable this feature, you must set the allowsPickingMultipleItems property to YES. Because MPMediaPickerController is a view controller, it can be displayed any way that you can display a view controller. It can be inside a tab bar view controller, pushed onto a navigation controller stack, or, in this case, presented as the modal view controller. How you choose to display it is up to you. Make sure you choose the method that fits the flow of your application. Figure 12.1 shows what the MPMediaPickerController looks like when displayed. The media types you select aren t limited to music. You can also select podcasts and audio books. When you initialize a new MPMediaPickerController, you have the
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Media: audio and recording
Figure 12.1 The MPMediaPickerController
option of selecting what type of media is shown by default. In the previous example, the picker will display the user s music library. Following in table 12.1 are the constants you can use to change which library is shown. After you ve created your MPMediaPickerController, you need to create a delegate to respond to two methods: mediaPicker:didPickMediaItems: and mediaPickerDidCancel:.
Table 12.1 Media constants Description The media type is music, and the picker is limited to the music library. The media type is a podcast, and the picker is limited to the podcast library. The media type is an audio book, and the picker is limited to the audio book library. The media type is an unspecified type of audio. The picker isn t limited to any specific audio type. Similar to MPMediaTypeAnyAudio. This allows the picker to pick any audio item from the library.
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