IOS-Use of AVAudioSession-playing music in the background, ios-avaudiosession

IOS-Use of AVAudioSession-playing music in the background, ios-avaudiosession
1. Preface • AVAudioSession is a singleton that can be directly used without instantiation. AVAudioSession plays an important role in various audio environments. • different audio session categories must be set for different audio application scenarios. 1.1AVAudioSession category • AVAudioSessionCategoryAmbient-sound mixing playback, such as rain and car engine, can be played together with other music • AVAudioSessionCategorySoloAmbient-Background playback, other music will be stopped • AVAudioSessionCategoryPlayback-exclusive music play • AVAudioSessionCategoryRecord-recording audio • AVAudioSessionCategoryPlayAndRecord-playing and recording audio • Audio-use a hardware decoder to Process audio during use of this audio session, no playback or recording illustration:

Category

Input

Output

Mixed with iPOD

Mute compliance

 

AVAudioSessionCategoryAmbient	No	Yes	Yes	Yes
AVAudioSessionCategorySoloAmbient	No	Yes	No	Yes
AVAudioSessionCategoryPlayback	No	Yes	No	No
AVAudioSessionCategoryRecord	Yes	No	No	No
AVAudioSessionCategoryPlayAndRecord	Yes	Yes	No	No

 

2. Playing music in the background 2. 1. Set background tasks

+ (UIBackgroundTaskIdentifier) backgroundPlayerID :( UIBackgroundTaskIdentifier) backTaskId {// 1. set and activate the audio session category AVAudioSession * session = [AVAudioSession sharedInstance]; [session AVAudioSessionCategoryPlayback error: nil]; [session setActive: YES error: nil]; // 2. allow applications to receive remote control [[UIApplication sharedApplication] beginReceivingRemoteControlEvents]; // 3. set background task ID UIBackgroundTaskIdentifier newTaskId = UBA CkgroundTaskInvalid; newTaskId = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler: nil]; if (newTaskId! = UIBackgroundTaskInvalid & backTaskId! = UIBackgroundTaskInvalid) {[[UIApplication sharedApplication] endBackgroundTask: backTaskId];} return newTaskId ;}

2. Set background playback

// Set AVAudioSession * session = [AVAudioSession sharedInstance]; [session setActive: YES error: nil]; [session setCategory: AVAudioSessionCategoryPlayback error: nil]; // enable the app to support remote control events [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

2. 3. Record the background playback code

// The background playback task IdUIBackgroundTaskIdentifier _ bgTaskId; // set the audio session to allow backend playback _ bgTaskId = [SoundTool backgroundPlayerID: _ bgTaskId];

 

 

 

Author: Clear Saup
Source: http://www.cnblogs.com/qingche/
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