Mixer.hh

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#ifndef MIXER_HH
#define MIXER_HH
 
#include "Observer.hh"
#include "BooleanSetting.hh"
#include "EnumSetting.hh"
#include "IntegerSetting.hh"
#include <vector>
#include <memory>
 
namespace openmsx {
 
class SoundDriver;
class Reactor;
class CommandController;
class MSXMixer;
 
struct StereoFloat {
        float left  = 0.0f;
        float right = 0.0f;
};
 
class Mixer final : private Observer<Setting>
{
public:
        enum SoundDriverType { SND_NULL, SND_SDL };
 
        Mixer(Reactor& reactor, CommandController& commandController);
        ~Mixer();
 
        void registerMixer(MSXMixer& mixer);
 
        void unregisterMixer(MSXMixer& mixer);
 
        void mute();
        void unmute();
 
        // Called by MSXMixer
 
        void uploadBuffer(MSXMixer& msxMixer, std::span<const StereoFloat> buffer);
 
        [[nodiscard]] IntegerSetting& getMasterVolume() { return masterVolume; }
 
private:
        void reloadDriver();
        void muteHelper();
 
        // Observer<Setting>
        void update(const Setting& setting) noexcept override;
 
private:
        std::vector<MSXMixer*> msxMixers; // unordered
 
        std::unique_ptr<SoundDriver> driver;
        Reactor& reactor;
        CommandController& commandController;
 
        EnumSetting<SoundDriverType> soundDriverSetting;
        BooleanSetting muteSetting;
        IntegerSetting masterVolume;
        IntegerSetting frequencySetting;
        IntegerSetting samplesSetting;
 
        int muteCount = 0;
};
 
} // namespace openmsx
 
#endif