獲取手機音頻輸出設備方法

iOS上所有可能的輸出設備：

/* Known values of route:
* "Headset"
* "Headphone"
* "Speaker"
* "SpeakerAndMicrophone"
* "HeadphonesAndMicrophone"
* "HeadsetInOut"
* "ReceiverAndMicrophone"
* "Lineout"
*/

以下是獲得當前手機的輸出設備方法

CFDictionaryRef currentRouteDescriptionDictionary = nil;

UInt32 dataSize = sizeof(currentRouteDescriptionDictionary);

AudioSessionGetProperty(kAudioSessionProperty_AudioRouteDescription, &dataSize, &currentRouteDescriptionDictionary);

if (currentRouteDescriptionDictionary) {

CFArrayRef outputs = CFDictionaryGetValue(currentRouteDescriptionDictionary, kAudioSession_AudioRouteKey_Outputs);

if (outputs) {

if(CFArrayGetCount(outputs) > 0) {

for (int i=0; i<CFArrayGetCount(outputs); i++) {

CFDictionaryRef output = CFArrayGetValueAtIndex(outputs, i);

CFStringRef outputType = CFDictionaryGetValue(output, kAudioSession_AudioRouteKey_Type);

NSLog(@" audio route type is %@",outputType);

}

}

}

}