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enum { // typedef UInt32 AudioSessionPropertyID kAudioSessionProperty_PreferredHardwareSampleRate = 'hwsr', // Float64 (get/set) kAudioSessionProperty_PreferredHardwareIOBufferDuration = 'iobd', // Float32 (get/set) kAudioSessionProperty_AudioCategory = 'acat', // UInt32 (get/set) kAudioSessionProperty_AudioRoute = 'rout', // CFStringRef (get only) kAudioSessionProperty_AudioRouteChange = 'roch', // CFDictionaryRef (property listener) kAudioSessionProperty_CurrentHardwareSampleRate = 'chsr', // Float64 (get only) kAudioSessionProperty_CurrentHardwareInputNumberChannels = 'chic', // UInt32 (get only) kAudioSessionProperty_CurrentHardwareOutputNumberChannels = 'choc', // UInt32 (get only) kAudioSessionProperty_CurrentHardwareOutputVolume = 'chov', // Float32 (get only/property listener) kAudioSessionProperty_CurrentHardwareInputLatency = 'cilt', // Float32 (get only) kAudioSessionProperty_CurrentHardwareOutputLatency = 'colt', // Float32 (get only) kAudioSessionProperty_CurrentHardwareIOBufferDuration = 'chbd', // Float32 (get only) kAudioSessionProperty_OtherAudioIsPlaying = 'othr', // UInt32 (get only) kAudioSessionProperty_OverrideAudioRoute = 'ovrd', // UInt32 (set only) kAudioSessionProperty_AudioInputAvailable = 'aiav', // UInt32 (get only/property listener) kAudioSessionProperty_ServerDied = 'died', // UInt32 (property listener) kAudioSessionProperty_OtherMixableAudioShouldDuck = 'duck', // UInt32 (get/set) kAudioSessionProperty_OverrideCategoryMixWithOthers = 'cmix', // UInt32 (get, some set) kAudioSessionProperty_OverrideCategoryDefaultToSpeaker = 'cspk', // UInt32 (get, some set) kAudioSessionProperty_OverrideCategoryEnableBluetoothInput = 'cblu', // UInt32 (get, some set) kAudioSessionProperty_InterruptionType = 'type', // UInt32 (get only) };
//具体作用如果字面不理解可以查看AudioServices.h(相关设置值，返回值头文件中也有)
listener使用:
AudioSessionInitialize (NULL, NULL, NULL, NULL);//初始化 OSStatus state = AudioSessionAddPropertyListener( kAudioSessionProperty_AudioRouteChange, audioRouteChangeListenerCallback,self); //state返回值如下 enum { kAudioSessionNoError = 0, kAudioSessionNotInitialized = '!ini', kAudioSessionAlreadyInitialized = 'init', kAudioSessionInitializationError = 'ini?', kAudioSessionUnsupportedPropertyError = 'pty?', kAudioSessionBadPropertySizeError = '!siz', kAudioSessionNotActiveError = '!act', kAudioServicesNoHardwareError = 'nohw', kAudioSessionNoCategorySet = '?cat', kAudioSessionIncompatibleCategory = '!cat', kAudioSessionUnspecifiedError = 'what' };//get的使用
UInt32 propertySize = sizeof(CFStringRef); AudioSessionInitialize(NULL, NULL, NULL, NULL); CFStringRef state = nil; AudioSessionGetProperty( kAudioSessionProperty_AudioRoute, &propertySize,&state);//set的使用
UInt32 propertySize = sizeof(UInt32); AudioSessionInitialize(NULL, NULL, NULL, NULL); UInt32 state = (1); AudioSessionSetProperty( kAudioSessionProperty_OtherMixableAudioShouldDuck, propertySize,&state);
Sep 03
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void audioRouteChangeListenerCallback ( void *inUserData, AudioSessionPropertyID inID, UInt32 inDataSize, const void *inData) { UInt32 propertySize = sizeof(CFStringRef); AudioSessionInitialize(NULL, NULL, NULL, NULL); CFStringRef state = nil; AudioSessionGetProperty(kAudioSessionProperty_AudioRoute ,&propertySize,&state);
NSLog(@"%@",(NSString *)state);//return @"Headphone" or @"Speaker" and so on.
} - (void)viewDidLoad { [super viewDidLoad];AudioSessionInitialize (NULL, NULL, NULL, NULL);
OSStatus status = AudioSessionAddPropertyListener( kAudioSessionProperty_AudioRouteChange, audioRouteChangeListenerCallback,self); //if(status == 0){//ok;} }