检测耳机是否插入 iPhone

Question

有谁知道您是否可以检测到耳机是否已插入 iPhone，如果没有，请从您的应用程序中禁用声音。

我想我可以管理禁用声音，但我还没有找到任何关于检测部分的内容。

谢谢

Answer 1

使用此代码，您可以检测以下之间的变化：

• 有线麦克风
• 耳机
• 线路输出
• 演讲者

Detecting when an iOS Device connector was plugged/unplugged

注意：由于 iOS 5 部分“audioRouteChangeListenerCallback(...)”行为已被弃用，但您可以通过以下方式对其进行更新：

// kAudioSession_AudioRouteChangeKey_PreviousRouteDescription -> Previous route
// kAudioSession_AudioRouteChangeKey_CurrentRouteDescription -> Current route

CFDictionaryRef newRouteRef = CFDictionaryGetValue(routeChangeDictionary, kAudioSession_AudioRouteChangeKey_CurrentRouteDescription);
NSDictionary *newRouteDict = (NSDictionary *)newRouteRef;

// RouteDetailedDescription_Outputs -> Output
// RouteDetailedDescription_Outputs -> Input

NSArray * paths = [[newRouteDict objectForKey: @"RouteDetailedDescription_Outputs"] count] ? [newRouteDict objectForKey: @"RouteDetailedDescription_Outputs"] : [newRouteDict objectForKey: @"RouteDetailedDescription_Inputs"];

NSString * newRouteString = [[paths objectAtIndex: 0] objectForKey: @"RouteDetailedDescription_PortType"];

// newRouteString -> MicrophoneWired, Speaker, LineOut, Headphone

问候

Answer 2

http://developer.apple.com/iphone/library/samplecode/SpeakHere/Introduction/Intro.html

在这个项目中有一个代码-sn-p，如果耳机被拔掉，它会暂停录音。也许你可以用它来达到你的效果。

祝你好运！

（编辑）

您必须研究 SpeakHereController.mm 文件。
我在awakeFromNib方法中找到了这段代码

// we do not want to allow recording if input is not available
error = AudioSessionGetProperty(kAudioSessionProperty_AudioInputAvailable, &size, &inputAvailable);
if (error) printf("ERROR GETTING INPUT AVAILABILITY! %d\n", error);
btn_record.enabled = (inputAvailable) ? YES : NO;

// we also need to listen to see if input availability changes
error = AudioSessionAddPropertyListener(kAudioSessionProperty_AudioInputAvailable, propListener, self);
if (error) printf("ERROR ADDING AUDIO SESSION PROP LISTENER! %d\n", error);

Answer 3

这是解决方案，您可能喜欢它或对您有帮助。

在使用下面的方法之前，也请写下这两行

UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_None; AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride);

(void)isHeadsetPluggedIn {
    UInt32 routeSize = sizeof (CFStringRef); CFStringRef route;
    AudioSessionGetProperty (kAudioSessionProperty_AudioRoute, &routeSize, &route);

    //NSLog(@"Error >>>>>>>>>> :%@", error); 
    /* Known values of route:
    "Headset"
    "Headphone"
    "Speaker"
    "SpeakerAndMicrophone"
    "HeadphonesAndMicrophone"
    "HeadsetInOut"
    "ReceiverAndMicrophone"
    "Lineout" */

    NSString* routeStr = (NSString*)route;

    NSRange headsetRange = [routeStr rangeOfString : @"Headset"]; NSRange receiverRange = [routeStr rangeOfString : @"Receiver"];

    if(headsetRange.location != NSNotFound) {
        // Don't change the route if the headset is plugged in. 
        NSLog(@"headphone is plugged in "); 
    } else
        if (receiverRange.location != NSNotFound) { 
            // Change to play on the speaker 
            NSLog(@"play on the speaker");
        } else {
            NSLog(@"Unknown audio route.");
        }
}

Answer 4

为了执行一次性检查以确定耳机是否已插入（而不是在拔出时设置回调），我在 iOS5 及更高版本中发现了以下工作：

- (BOOL) isAudioJackPlugged
{

// initialise the audio session - this should only be done once - so move this line to your AppDelegate
AudioSessionInitialize(NULL, NULL, NULL, NULL);
UInt32 routeSize;

// oddly, without calling this method caused an error.
AudioSessionGetPropertySize(kAudioSessionProperty_AudioRouteDescription, &routeSize);
CFDictionaryRef desc; // this is the dictionary to contain descriptions

// make the call to get the audio description and populate the desc dictionary
AudioSessionGetProperty (kAudioSessionProperty_AudioRouteDescription, &routeSize, &desc);

// the dictionary contains 2 keys, for input and output. Get output array
CFArrayRef outputs = CFDictionaryGetValue(desc, kAudioSession_AudioRouteKey_Outputs);

// the output array contains 1 element - a dictionary
CFDictionaryRef dict = CFArrayGetValueAtIndex(outputs, 0);

// get the output description from the dictionary
CFStringRef output = CFDictionaryGetValue(dict, kAudioSession_AudioRouteKey_Type);

/**
 These are the possible output types:
 kAudioSessionOutputRoute_LineOut
 kAudioSessionOutputRoute_Headphones
 kAudioSessionOutputRoute_BluetoothHFP
 kAudioSessionOutputRoute_BluetoothA2DP
 kAudioSessionOutputRoute_BuiltInReceiver
 kAudioSessionOutputRoute_BuiltInSpeaker
 kAudioSessionOutputRoute_USBAudio
 kAudioSessionOutputRoute_HDMI
 kAudioSessionOutputRoute_AirPlay
 */

return CFStringCompare(output, kAudioSessionOutputRoute_Headphones, 0) == kCFCompareEqualTo;
}

对于那些在家里记分的人来说，这是字典中的字典中的字符串。