老谭笔记

检测Mac是否在使用耳机

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前两天有朋友在我博客留言问如何检测Mac是否在使用耳机，今天抽时间去查了一下API，检测方法应该不只一种，我暂且贴出这一段代码吧：

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#import "AppDelegate.h"
#import <CoreAudio/CoreAudio.h>
@interface AppDelegate ()
{
    AudioDeviceID defaultDevice;
}
@end
@implementation AppDelegate
- (void)checkAudioHardware:(const AudioObjectPropertyAddress *)sourceAddr
{
    UInt32 dataSourceId = 0;
    UInt32 dataSourceIdSize = sizeof(UInt32);
    AudioObjectGetPropertyData(defaultDevice, sourceAddr, 0, NULL, &dataSourceIdSize, &dataSourceId);
    
    if (dataSourceId == 'ispk') {
        NSLog(@"没用耳机");
    } else if (dataSourceId == 'hdpn') {
        NSLog(@"使用耳机");
    }
}
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    //获得内置输出设备
    UInt32 defaultSize = sizeof(AudioDeviceID);
    const AudioObjectPropertyAddress defaultAddr =
    {
        kAudioHardwarePropertyDefaultOutputDevice,
        kAudioObjectPropertyScopeGlobal,
        kAudioObjectPropertyElementMaster
    };
    AudioObjectGetPropertyData(kAudioObjectSystemObject, &defaultAddr, 0, NULL, &defaultSize, &defaultDevice);
    
    //注册输出设备改变的通知
    AudioObjectPropertyAddress sourceAddr;
    sourceAddr.mSelector = kAudioDevicePropertyDataSource;
    sourceAddr.mScope = kAudioDevicePropertyScopeOutput;
    sourceAddr.mElement = kAudioObjectPropertyElementMaster;
    AudioObjectAddPropertyListenerBlock(defaultDevice, &sourceAddr, dispatch_get_current_queue(), ^(UInt32 inNumberAddresses, const AudioObjectPropertyAddress *inAddresses) {
        [self checkAudioHardware:inAddresses];
    });
    
    //第一次主动检测
    [self checkAudioHardware:&sourceAddr];
}
@end