检测耳机(非麦克风)是否已插入iOS设备

Question

我需要根据是否插入耳机来改变我的音频.我知道kAudioSessionProperty_AudioInputAvailable,它会告诉我是否有麦克风,但我想测试任何耳机,而不仅仅是带有内置耳机的耳机在麦克风.这可能吗？

Answer 1

这是我自己的方法,它是在本网站上发现的一个略微修改的版本:http://www.iphonedevsdk.com/forum/iphone-sdk-development/9982-play-record-same-time.html

- (BOOL)isHeadsetPluggedIn {
    UInt32 routeSize = sizeof (CFStringRef);
    CFStringRef route;

    OSStatus error = AudioSessionGetProperty (kAudioSessionProperty_AudioRoute,
                                              &routeSize,
                                              &route);

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

    if (!error && (route != NULL)) {

        NSString* routeStr = (NSString*)route;

        NSRange headphoneRange = [routeStr rangeOfString : @"Head"];

        if (headphoneRange.location != NSNotFound) return YES;

    }

    return NO;
}

Answer 2

这是基于rob mayoff评论的解决方案:

- (BOOL)isHeadsetPluggedIn
{
    AVAudioSessionRouteDescription *route = [[AVAudioSession sharedInstance] currentRoute];

    BOOL headphonesLocated = NO;
    for( AVAudioSessionPortDescription *portDescription in route.outputs )
    {
        headphonesLocated |= ( [portDescription.portType isEqualToString:AVAudioSessionPortHeadphones] );
    }
    return headphonesLocated;
}

只需链接到AVFoundation框架即可.