audio session. 스피커 제어하기

Framework : AudioToolbox.framework

#import <AudioToolbox/AudioToolbox.h>

//------------------------------------------------------------------------------

// audio session Callback 함수. 출력 경로변경

//------------------------------------------------------------------------------

static void callbackFunction_audioRouteChangeListener(void* inUserData, AudioSessionPropertyID inPropertyID, UInt32 inPropertyValueSize, const void* inPropertyValue)

{

  if(inPropertyID != kAudioSessionProperty_AudioRouteChange) return;

  

  // 사운드 출력 경로가 바뀐 이유.

  CFDictionaryRef routeChangeDictionary = inPropertyValue;

  CFNumberRef routeChangeReasonRef = CFDictionaryGetValue(routeChangeDictionary, CFSTR (kAudioSession_AudioRouteChangeKey_Reason));

  SInt32 routeChangeReason;

  CFNumberGetValue (routeChangeReasonRef, kCFNumberSInt32Type, &routeChangeReason);

  

  // 이어폰 뺐을때...

  if(routeChangeReason == kAudioSessionRouteChangeReason_OldDeviceUnavailable)

  {

    VTMainView* mainView = inUserData;

    mainView->bSpeakerMode = false;

    [mainView audioSession_SpeakerOnOrOff];

  }

  

  // 이어폰 연결했을때...

  if(routeChangeReason == kAudioSessionRouteChangeReason_NewDeviceAvailable)

  {

    VTMainView* mainView = inUserData;

    mainView->bSpeakerMode = false;

  }

}

#pragma mark - AudioSession 제어 함수들...

//------------------------------------------------------------------------------

// audio session 초기화

//------------------------------------------------------------------------------

- (void)audioSession_Init

{

  void* userData = self;

  AudioSessionInitialize(NULL, NULL, NULL, NULL);

  UInt32 sessionCategory = kAudioSessionCategory_PlayAndRecord;

  AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(sessionCategory), &sessionCategory);

  AudioSessionPropertyID routeChangeID = kAudioSessionProperty_AudioRouteChange;

  AudioSessionAddPropertyListener(routeChangeID, callbackFunction_audioRouteChangeListener, userData);

}

//------------------------------------------------------------------------------

// 스피커 활성화 (1:활성   0:비활성)

//------------------------------------------------------------------------------

- (void)audioSession_SpeakerOnOrOff

{

  // 이미 스피커모드이면... 스피커 비활성화

  if(bSpeakerMode)

  {

    UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_None;

    AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRouteOverride), &audioRouteOverride);

  }

  // 스피커모드가 아니면... 스피커 활성화

  else

  {

    UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;

    AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRouteOverride), &audioRouteOverride);

  }

  

  bSpeakerMode = !bSpeakerMode;

}