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12.2.3 Responding to AVAudioRecorder events
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Like many API classes, AVAudioRecorder sends messages to a delegate. To respond to delegate actions from the AVAudioRecorder, your class must implement the AVAudioRecorderDelegate. Table 12.7 describes the methods that can be implemented.
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Table 12.7
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AVAudioRecorderDelegate methods
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Method Description Called when the recorder finishes recording. This method is passed a reference to the recorder and a Boolean value that s YES if it was successful. Called when an error occurs during recording.
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- (void)audioRecorderDidFinishRecording: (AVAudioRecorder *)recorder successfully:(BOOL)flag
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-(void)audioRecorderEncodeErrorDidOccur: (AVAudioRecorder *)recorder error:(NSError *)error - (void)audioRecorderBeginInterruption: (AVAudioRecorder *)recorder
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Called when the recording is interrupted. The most common interruption is when the user gets an incoming call while recording. Called when the interruption ends. An example is pressing Ignore in response to an incoming call.
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- (void)audioRecorderEndInterruption: (AVAudioRecorder *)recorder
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As with most delegate classes, it s important to implement all of these methods in your class. Doing so ensures that your application responds correctly in any circumstance. Now that you know how to record audio, the next step is to play it back. The next section will discuss the method for playing your recordings as well as any other audio files in your application.
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12.3 Playing sounds manually
Prior to the release of the iPhone 3.0 API, playing audio files was a fairly complex task. There were functions to simplify the process, but they were limited to 30 seconds and didn t support simultaneous playback. To achieve this functionality, you had to use some relatively low-level audio libraries. These include Audio Queue Services, Audio File Stream Services, Audio File Services, OpenAL, Audio Session Services, and more. The aforementioned audio libraries are powerful but are no longer needed. The AVAudioPlayer has replaced all of them and is now recommended by Apple for all
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Playing sounds manually
audio playback. According to the API documentation of the AVAudioPlayer, Apple recommends that you use this class for audio playback unless your application requires stereo positioning or precise synchronization, or you are playing audio captured from a network stream. The AVAudioPlayer class provides a fully featured interface for playing and managing audio. Following is a list of some of the features available in AVAudioPlayer: Plays sounds of any length Loops sounds Plays sounds simultaneously Controls the playback level for each sound Seeks, which allows you to do fast forward and rewind Obtains and displays metering data about levels, peaks, and so on Let s look at how to use the AVAudioPlayer. Later in the section, we ll also explain how to vibrate an iPhone.
12.3.1 Initializing the AVAudioPlayer
The AVAudioPlayer provides two methods for initialization. The first method is initWithData:error. This method initializes the player with an NSData object containing the audio data to be played. The second parameter is a reference to an NSError for error reporting. This method is useful when you have audio data on hand and don t need to load it from disk. The second method of initialization is initWithContentsOfURL:error. This method will probably be more useful unless you re working on an audio-editing application. The first parameter is an NSURL containing the location of the audio file. You ll need to build an NSURL from the path to your audio file. Here s an example of initializing an AVAudioPlayer using the initWithContentsOfURL:error method:
NSString * filePath = [NSHomeDirectory() stringByAppendingPathComponent: @"Documents/recording.caf"]; AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: [NSURL fileURLWithPath:filePath] error: nil]; newPlayer.delegate = self;
This example initializes an audio player with a file named recording.caf located in the Documents directory. Like the AVAudioRecorder, this variable is of the type NSURL. After building a new AVAudioPlayer object, you need to set its delegate to respond to its actions. In this example, the delegate is assigned to the calling class.
12.3.2 The AVAudioPlayerDelegate
The delegate for the AVAudioPlayer is similar to the delegate for the AVAudioRecorder. It responds to exactly the same events, replacing recorder with player. Table 12.8 discusses these events.
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