iphone - ¿Hay algún evento para cuando se desconectan los auriculares?

ios objective-c

Question

Durante una prueba, un cliente notó que la reproducción de video en el iPhone se detiene cuando los auriculares están desconectados. Quería una funcionalidad similar para la reproducción de audio, y tal vez la capacidad de mostrar un mensaje.

¿Alguien sabe si hay algún evento de algún tipo al que pueda conectar para hacer esto posible?

Answer 1

Aquí está la implementación completa que eventualmente usé para enviar eventos cuando los auriculares están conectados (y desconectados).

Había una gran cantidad de complejidad con la que tenía que lidiar para garantizar que las cosas siguieran funcionando después de que la aplicación fuera devuelta 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

Answer 2

Consulte Respuesta a cambios de ruta en la Guía de programación de sesiones de audio.

-bagazo

Answer 3

La solución Swift 3.0 @ snakeoil:

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

Answer 4

Esto cambió con iOS 7, solo necesita escuchar la notificación llamada AVAudioSessionRouteChangeNotification

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