【UE4 C++】播放声音与控制音量

播放声音

• PlaySoundAtLocation()

  USoundCue* HitSound = LoadObject<USoundCue>(this, TEXT("SoundCue'/Game/Demo_Drone/Sound/explore_Cue.explore_Cue'"));
  if (HitSound)
  {
  UGameplayStatics::PlaySoundAtLocation(this, HitSound,SweepResult.Location);
  }
  

• PlaySound2D()

  UGameplayStatics::PlaySound2D(GetWorld(), HitSound)
  

• 使用组件

  • static UAudioComponent* SpawnSound2D()
  • static UAudioComponent* CreateSound2D()
  • static UAudioComponent* SpawnSoundAtLocation()
  • static UAudioComponent* SpawnSoundAttached()

• slate 中播放声音

  FSlateApplication::Get().PlaySound(MenuStyle->MenuBGM);
  

---

控制音量

• 加载USoundCue资源 直接改变 USoundCue::VolumeMultiplier

  FSlateSound 资源亦可以强转

  USoundCue* sound= Cast<USoundCue>(MenuStyle->StartGameSound.GetResourceObject());
  sound->VolumeMultiplier = SoundVolume;
  

• 通过 FAudioDevice、USoundMix、USoundClass

  • Conten 下创建 USoundClass 、USoundMix资源
  • USoundMix资源属性中添加 Sound Class Effects 元素，元素为刚创建的USoundClass 资源
  • Sound Wave 资源属性中设置 Sound Class 为刚创建的 USoundClass
  • C++ 实现

  // .h定义
  class USoundMix* SoundMix;
  class USoundClass* MusicClass;
  class USoundClass* SoundClass;
  class FAudioDevice* AudioDevice;
  
  //.cpp 调用 初始化
  MusicClass = LoadObject<USoundClass>(nullptr,TEXT("SoundClass'/Game/Blueprints/Sound/MusicClass.MusicClass'"));
  SoundClass = LoadObject<USoundClass>(nullptr,TEXT("SoundClass'/Game/Blueprints/Sound/SoundClass.SoundClass'"));
  SoundMix = LoadObject<USoundMix>(nullptr,TEXT("SoundMix'/Game/Blueprints/Sound/SoundMix.SoundMix'"));
  AudioDevice = GEngine->GetMainAudioDeviceRaw();
  AudioDevice->PushSoundMixModifier(SoundMix);
  
  //.cpp 调用 改变音量
  AudioDevice->SetSoundMixClassOverride(SoundMix, MusicClass, MusicVolume, 1.f, 0.2f, false);
  AudioDevice->SetSoundMixClassOverride(SoundMix, SoundClass, SoundVolume, 1.f, 0.2f, false);