¿Hay un evento para cuando los auriculares están desconectados?

Question

Durante una prueba, un cliente se dio cuenta de que la reproducción de vídeo en las pausas iPhone cuando los auriculares están desconectados. Él quería una funcionalidad similar para la reproducción de audio, y tal vez la posibilidad de que aparezca un mensaje.

¿alguien sabe si hay un evento de algún tipo que pudiera enganchar en que esto sea posible?

Answer 1

respuesta a los cambios de ruta de la sesión de audio Guía de programación.

-Marc

Answer 2

Esto cambió con iOS 7, sólo tiene que escuchar la notificación de llamada AVAudioSessionRouteChangeNotification

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(audioRouteChanged:) name:AVAudioSessionRouteChangeNotification object:nil];

Answer 3

Swift 3.0 @ solución de Snakeoil:

    NotificationCenter.default.addObserver(self, selector: #selector(YourViewController.yourMethodThatShouldBeCalledOnChange), name: NSNotification.Name.AVAudioSessionRouteChange, object: nil)

Answer 4

Aquí está la aplicación plena Finalmente he utilizado para el envío de eventos cuando los auriculares están conectados (y desconectados).

Hubo una buena cantidad de complejidad que necesitaba para hacer frente a asegurar que las cosas aún funcionaba después de la aplicación se devuelve desde el fondo.

archivo CVAudioSession.h

#import <Foundation/Foundation.h>

#define kCVAudioInputChangedNotification @"kCVAudioInputChangedNotification"
#define kCVAudioInterruptionEnded @"kCVAudioInterruptionEnded"

@interface CVAudioSession : NSObject
+(void) setup;
+(void) destroy;
+(NSString*) currentAudioRoute;
+(BOOL) interrupted;
@end

archivo CVAudioSession.m

#import "CVAudioSession.h"
#import <AudioToolbox/AudioToolbox.h>

@implementation CVAudioSession

static BOOL _isInterrupted = NO;

+(void) setup {
    NSLog(@"CVAudioSession setup");

    // Set up the audio session for recording
    OSStatus error = AudioSessionInitialize(NULL, NULL, interruptionListener, (__bridge void*)self);

    if (error) NSLog(@"ERROR INITIALIZING AUDIO SESSION! %ld\n", error);
    if (!error) {
        UInt32 category = kAudioSessionCategory_RecordAudio; // NOTE CANT PLAY BACK WITH THIS
        error = AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(category), &category);
        if (error) NSLog(@"couldn't set audio category!");

        error = AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange, propListener, (__bridge void*) self);
        if (error) NSLog(@"ERROR ADDING AUDIO SESSION PROP LISTENER! %ld\n", error);
        UInt32 inputAvailable = 0;
        UInt32 size = sizeof(inputAvailable);

        // we do not want to allow recording if input is not available
        error = AudioSessionGetProperty(kAudioSessionProperty_AudioInputAvailable, &size, &inputAvailable);
        if (error) NSLog(@"ERROR GETTING INPUT AVAILABILITY! %ld\n", error);

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

        error = AudioSessionSetActive(true);
        if (error) NSLog(@"CVAudioSession: AudioSessionSetActive (true) failed");
    }
}

+ (NSString*) currentAudioRoute {
    UInt32 routeSize = sizeof (CFStringRef);
    CFStringRef route;

    AudioSessionGetProperty (kAudioSessionProperty_AudioRoute,
                             &routeSize,
                             &route);

    NSString* routeStr = (__bridge NSString*)route;
    return routeStr;
}

+(void) destroy {
    NSLog(@"CVAudioSession destroy");

    // Very important - remove the listeners, or we'll crash when audio routes etc change when we're no longer on screen
    OSStatus stat = AudioSessionRemovePropertyListenerWithUserData(kAudioSessionProperty_AudioRouteChange, propListener, (__bridge void*)self);
    NSLog(@".. AudioSessionRemovePropertyListener kAudioSessionProperty_AudioRouteChange returned %ld", stat);

    stat = AudioSessionRemovePropertyListenerWithUserData(kAudioSessionProperty_AudioInputAvailable, propListener, (__bridge void*)self);
    NSLog(@".. AudioSessionRemovePropertyListener kAudioSessionProperty_AudioInputAvailable returned %ld", stat);

    AudioSessionSetActive(false); // disable audio session.
    NSLog(@"AudioSession is now inactive");
}

+(BOOL) interrupted {
    return _isInterrupted;
}

// Called when audio is interrupted for whatever reason. NOTE: doesn't always call the END one..
void interruptionListener(  void *  inClientData,
                          UInt32    inInterruptionState) {

    if (inInterruptionState == kAudioSessionBeginInterruption)
    {
        _isInterrupted = YES;

        NSLog(@"CVAudioSession: interruptionListener kAudioSessionBeginInterruption. Disable audio session..");

        // Try just deactivating the audiosession..
        OSStatus rc = AudioSessionSetActive(false);
        if (rc) {
            NSLog(@"CVAudioSession: interruptionListener kAudioSessionBeginInterruption - AudioSessionSetActive(false) returned %.ld", rc);
        } else {
            NSLog(@"CVAudioSession: interruptionListener kAudioSessionBeginInterruption - AudioSessionSetActive(false) ok.");
        }



    } else if (inInterruptionState == kAudioSessionEndInterruption) {

        _isInterrupted = NO;

        // Reactivate the audiosession
        OSStatus rc = AudioSessionSetActive(true);
        if (rc) {
            NSLog(@"CVAudioSession: interruptionListener kAudioSessionEndInterruption - AudioSessionSetActive(true) returned %.ld", rc);
        } else {
            NSLog(@"CVAudioSession: interruptionListener kAudioSessionEndInterruption - AudioSessionSetActive(true) ok.");   
        }

        [[NSNotificationCenter defaultCenter] postNotificationName:kCVAudioInterruptionEnded object:(__bridge NSObject*)inClientData userInfo:nil];
    }
}

// This is called when microphone or other audio devices are plugged in and out. Is on the main thread
void propListener(  void *                  inClientData,
                  AudioSessionPropertyID    inID,
                  UInt32                  inDataSize,
                  const void *            inData)
{
    if (inID == kAudioSessionProperty_AudioRouteChange)
    {
        CFDictionaryRef routeDictionary = (CFDictionaryRef)inData;
        CFNumberRef reason = (CFNumberRef)CFDictionaryGetValue(routeDictionary, CFSTR(kAudioSession_AudioRouteChangeKey_Reason));
        SInt32 reasonVal;
        CFNumberGetValue(reason, kCFNumberSInt32Type, &reasonVal);
        if (reasonVal != kAudioSessionRouteChangeReason_CategoryChange)
        {
            NSLog(@"CVAudioSession: input changed");
            [[NSNotificationCenter defaultCenter] postNotificationName:kCVAudioInputChangedNotification object:(__bridge NSObject*)inClientData userInfo:nil];
        }
    }
    else if (inID == kAudioSessionProperty_AudioInputAvailable)
    {
        if (inDataSize == sizeof(UInt32)) {
            UInt32 isAvailable = *(UInt32*)inData;

            if (isAvailable == 0) {
                NSLog(@"AUDIO RECORDING IS NOT AVAILABLE");
            }
        }
    }
}

@end