ResampledSoundDevice.hh

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#ifndef RESAMPLEDSOUNDDEVICE_HH
#define RESAMPLEDSOUNDDEVICE_HH
 
#include "SoundDevice.hh"
 
#include "DynamicClock.hh"
#include "EnumSetting.hh"
 
#include "Observer.hh"
 
#include <memory>
 
namespace openmsx {
 
class MSXMotherBoard;
class ResampleAlgo;
class Setting;
 
class ResampledSoundDevice : public SoundDevice, protected Observer<Setting>
{
public:
        enum class ResampleType { HQ, BLIP };
 
        bool generateInput(float* buffer, size_t num);
 
        [[nodiscard]] DynamicClock& getEmuClock() { return emuClock; }
 
        // setBalance() might switch between mono/stereo
        void postSetBalance() override {
                createResampler();
                SoundDevice::postSetBalance();
        }
 
protected:
        ResampledSoundDevice(MSXMotherBoard& motherBoard, std::string_view name,
                             static_string_view description, unsigned channels,
                             unsigned inputSampleRate, bool stereo);
        ~ResampledSoundDevice();
 
        // SoundDevice
        void setOutputRate(unsigned hostSampleRate, double speed) override;
        bool updateBuffer(size_t length, float* buffer,
                          EmuTime::param time) override;
 
        // Observer<Setting>
        void update(const Setting& setting) noexcept override;
 
        void createResampler();
 
private:
        EnumSetting<ResampleType>& resampleSetting;
        std::unique_ptr<ResampleAlgo> algo;
        DynamicClock emuClock{EmuTime::zero()}; // time of the last produced emu-sample,
                                                //    ticks once per emu-sample
};
 
} // namespace openmsx
 
#endif