audio_group.h

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#pragma once
 
#include "miniaudio/miniaudio.h"
#include <chrono>
#include <memory>
 
namespace audio {
 
class AudioGroup {
  friend class AudioManager;
  
  friend class AudioSystem;
  
  friend class Sound;
 
 public:
  static std::unique_ptr<AudioGroup> Create(ma_engine* engine) {
    return std::unique_ptr<AudioGroup>(new AudioGroup(engine));
  }
 
 private:
  explicit AudioGroup(ma_engine* engine);
 
 public:
  ~AudioGroup();
  
 private:
 
  void SetVolume(float volume);
  
  float GetVolume() const { return volume_; }
 
  void FadeVolume(float targetVolume, std::chrono::milliseconds duration);
 
  ma_sound_group* GetHandle() { return sound_group_; }
 
  std::chrono::steady_clock::time_point GetFadeEndTime() const { return fade_end_time_; }
  
  float GetTargetVolume() const { return target_volume_; }
  
  float GetStartVolume() const { return start_volume_; }
  
  bool IsFading() const { return is_fading_; }
  
  std::chrono::milliseconds GetFadeDuration() const { return fade_duration_; }
  
  void SetFadingState(bool fading) { is_fading_ = fading; }
 
 private:
  float target_volume_{0.0f};                          
  float start_volume_{0.0f};                           
  bool is_fading_{false};                              
  std::chrono::steady_clock::time_point fade_end_time_; 
  std::chrono::milliseconds fade_duration_{0};          
  
  ma_sound_group* sound_group_;                        
  ma_engine* engine_;                                  
  
  float volume_;                                       
};
 
}  // namespace audio