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，而不仅仅是耳机内置麦克风。这可能吗？

Answer 1

以下是我自己的一种方法，它是本网站上的一个略微修改过的版本：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。

Answer 3

对于这篇文章的任何未来读者来说都是个好消息。

大多数AVToolbox方法在iOS 7发布时已被弃用，没有替代方案，因此音频监听器现在主要是冗余

Answer 4

我开始使用jpsetung上面给出的代码，但是我的用例有一些问题：

在文档

kAudioSessionProperty_AudioRoute

泄漏route
无音频会话检查
检查耳机而不是类别的逻辑意识
我对iPhone是否使用扬声器更感兴趣，“耳机”意味着“扬声器以外的任何东西”。我觉得忽略“bluetooth”，“airplay”或“lineout”等选项很危险。

此实现扩展了检查以允许任何类型的指定输出：

BOOL isAudioRouteAvailable(CFStringRef routeType)
{
    /*
    As of iOS 5:
    kAudioSessionOutputRoute_LineOut;
    kAudioSessionOutputRoute_Headphones;
    kAudioSessionOutputRoute_BluetoothHFP;
    kAudioSessionOutputRoute_BluetoothA2DP;
    kAudioSessionOutputRoute_BuiltInReceiver;
    kAudioSessionOutputRoute_BuiltInSpeaker;
    kAudioSessionOutputRoute_USBAudio;
    kAudioSessionOutputRoute_HDMI;
    kAudioSessionOutputRoute_AirPlay;
    */

    //Prep
    BOOL foundRoute = NO;
    CFDictionaryRef description = NULL;

    //Session
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        AudioSessionInitialize(NULL, NULL, NULL, NULL);
    });

    //Property
    UInt32 propertySize;
    AudioSessionGetPropertySize(kAudioSessionProperty_AudioRouteDescription, &propertySize);
    OSStatus error = AudioSessionGetProperty(kAudioSessionProperty_AudioRouteDescription, &propertySize, &description);
    if ( !error && description ) {
        CFArrayRef outputs = CFDictionaryGetValue(description, kAudioSession_AudioRouteKey_Outputs);
        CFIndex count = CFArrayGetCount(outputs);
        if ( outputs && count ) {
            for (CFIndex i = 0; i < count; i++) {
                CFDictionaryRef route = CFArrayGetValueAtIndex(outputs, i);
                CFStringRef type = CFDictionaryGetValue(route, kAudioSession_AudioRouteKey_Type);
                NSLog(@"Got audio route %@", type);

                //Audio route type
                if ( CFStringCompare(type, routeType, 0) == kCFCompareEqualTo ) {
                    foundRoute = YES;
                    break;
                }
            }
        }
    } else if ( error ) {
        NSLog(@"Audio route error %ld", error);
    }

    //Cleanup
    if ( description ) {
        CFRelease(description);
    }

    //Done
    return foundRoute;  
}

像这样使用：

if ( isAudioRouteAvailable(kAudioSessionOutputRoute_BuiltInSpeaker) ) {
    //Do great things...
}

检测耳机（非麦克风）是否已插入iOS设备

4 个答案: