如何以编程方式检测耳机在iphone?
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11-09-2019 - |
题
我目前正在对包括播放音乐,从iPhone音乐库中的应用程序内内的一个项目。我使用MPMediaPickerController允许用户选择自己的音乐,并使用iPhone中的iPod音乐播放器播放。
然而,我跑成问题,当用户将他的耳机和删除它。音乐就会突然停止播放没有任何理由。经过一些测试,我发现了iPod播放器将暂停播放,当用户从设备中拔出自己的耳机。那么,有没有办法以编程方式检测是否听筒已拔掉,这样我可以继续播放音乐?或者是有什么办法可以防止iPod播放器的暂停,当用户拔下耳机了?
解决方案
您应该注册AudioRoute更改通知和实施要如何处理狂胜变化
// Registers the audio route change listener callback function
AudioSessionAddPropertyListener (kAudioSessionProperty_AudioRouteChange,
audioRouteChangeListenerCallback,
self);
和回调中,你可以得到路线变更的原因
CFDictionaryRef routeChangeDictionary = inPropertyValue;
CFNumberRef routeChangeReasonRef =
CFDictionaryGetValue (routeChangeDictionary,
CFSTR (kAudioSession_AudioRouteChangeKey_Reason));
SInt32 routeChangeReason;
CFNumberGetValue (routeChangeReasonRef, kCFNumberSInt32Type, &routeChangeReason);
if (routeChangeReason == kAudioSessionRouteChangeReason_OldDeviceUnavailable)
{
// Headset is unplugged..
}
if (routeChangeReason == kAudioSessionRouteChangeReason_NewDeviceAvailable)
{
// Headset is plugged in..
}
其他提示
如果你只是要检查耳机是否在任何给定的时间插上,不听路由变化,你可以简单地做到以下几点:
OSStatus error = AudioSessionInitialize(NULL, NULL, NULL, NULL);
if (error)
NSLog("Error %d while initializing session", error);
UInt32 routeSize = sizeof (CFStringRef);
CFStringRef route;
error = AudioSessionGetProperty (kAudioSessionProperty_AudioRoute,
&routeSize,
&route);
if (error)
NSLog("Error %d while retrieving audio property", error);
else if (route == NULL) {
NSLog(@"Silent switch is currently on");
} else if([route isEqual:@"Headset"]) {
NSLog(@"Using headphones");
} else {
NSLog(@"Using %@", route);
}
干杯, 拉斐尔Colasante
我看到你正在使用的MPMediaPlayer框架然而麦克风处理使用AVAudioPlayer框架,您将需要添加到您的项目中完成的。
苹果的网站具有代码从AVAudioPlayer框架,我使用于来自用户的中断处理在插入或移除所述苹果麦克风的耳机。
查看苹果的 iPhone开发中心音频会话编程指南。
- (void) beginInterruption {
if (playing) {
playing = NO;
interruptedWhilePlaying = YES;
[self updateUserInterface];
}
}
NSError *activationError = nil;
- (void) endInterruption {
if (interruptedWhilePlaying) {
[[AVAudioSession sharedInstance] setActive: YES error: &activationError];
[player play];
playing = YES;
interruptedWhilePlaying = NO;
[self updateUserInterface];
}
}
我的代码是有点不同的,一些本可以帮助你:
void interruptionListenerCallback (
void *inUserData,
UInt32 interruptionState
) {
// This callback, being outside the implementation block, needs a reference
// to the AudioViewController object
RecordingListViewController *controller = (RecordingListViewController *) inUserData;
if (interruptionState == kAudioSessionBeginInterruption) {
//NSLog (@"Interrupted. Stopping playback or recording.");
if (controller.audioRecorder) {
// if currently recording, stop
[controller recordOrStop: (id) controller];
} else if (controller.audioPlayer) {
// if currently playing, pause
[controller pausePlayback];
controller.interruptedOnPlayback = YES;
}
} else if ((interruptionState == kAudioSessionEndInterruption) && controller.interruptedOnPlayback) {
// if the interruption was removed, and the app had been playing, resume playback
[controller resumePlayback];
controller.interruptedOnPlayback = NO;
}
}
void recordingListViewMicrophoneListener (
void *inUserData,
AudioSessionPropertyID inPropertyID,
UInt32 inPropertyValueSize,
const void *isMicConnected
) {
// ensure that this callback was invoked for a change to microphone connection
if (inPropertyID != kAudioSessionProperty_AudioInputAvailable) {
return;
}
RecordingListViewController *controller = (RecordingListViewController *) inUserData;
// kAudioSessionProperty_AudioInputAvailable is a UInt32 (see Apple Audio Session Services Reference documentation)
// to read isMicConnected, convert the const void pointer to a UInt32 pointer
// then dereference the memory address contained in that pointer
UInt32 connected = * (UInt32 *) isMicConnected;
if (connected){
[controller setMicrophoneConnected : YES];
}
else{
[controller setMicrophoneConnected: NO];
}
// check to see if microphone disconnected while recording
// cancel the recording if it was
if(controller.isRecording && !connected){
[controller cancelDueToMicrophoneError];
}
}
嗨只是检查AddMusic示例应用程序。将解决所有的iPod相关的问题
第一寄存器iPod播放器的通知用下面的代码
NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
[notificationCenter
addObserver: self
selector: @selector (handle_PlaybackStateChanged:)
name: MPMusicPlayerControllerPlaybackStateDidChangeNotification
object: musicPlayer];
[musicPlayer beginGeneratingPlaybackNotifications];
和实施在通知中的下面的代码
- (void) handle_PlaybackStateChanged: (id) notification
{
MPMusicPlaybackState playbackState = [musicPlayer playbackState];
if (playbackState == MPMusicPlaybackStatePaused)
{
[self playiPodMusic];
}
else if (playbackState == MPMusicPlaybackStatePlaying)
{
}
else if (playbackState == MPMusicPlaybackStateStopped)
{
[musicPlayer stop];
}
}
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