Y8950Adpcm.hh

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#ifndef Y8950ADPCM_HH
#define Y8950ADPCM_HH
 
#include "Clock.hh"
#include "Schedulable.hh"
#include "TrackedRam.hh"
#include "openmsx.hh"
#include "serialize_meta.hh"
 
namespace openmsx {
 
class DeviceConfig;
class Y8950;
 
class Y8950Adpcm final : public Schedulable
{
public:
        Y8950Adpcm(Y8950& y8950, const DeviceConfig& config,
                   const std::string& name, unsigned sampleRam);
 
        void clearRam();
        void reset(EmuTime::param time);
        [[nodiscard]] bool isMuted() const;
        void writeReg(byte rg, byte data, EmuTime::param time);
        [[nodiscard]] byte readReg(byte rg, EmuTime::param time);
        [[nodiscard]] byte peekReg(byte rg, EmuTime::param time) const;
        [[nodiscard]] int calcSample();
        void sync(EmuTime::param time);
        void resetStatus();
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
private:
        // This data is updated while playing
        struct PlayData {
                unsigned memPtr;
                unsigned nowStep;
                int out;
                int output;
                int diff;
                int nextLeveling;
                int sampleStep;
                byte adpcm_data;
        };
 
        // Schedulable
        void executeUntil(EmuTime::param time) override;
 
        void schedule();
        void restart(PlayData& pd) const;
 
        [[nodiscard]] bool isPlaying() const;
        void writeData(byte data);
        [[nodiscard]] byte peekReg(byte rg) const;
        [[nodiscard]] byte readData();
        [[nodiscard]] byte peekData() const;
        void writeMemory(unsigned memPtr, byte value);
        [[nodiscard]] byte readMemory(unsigned memPtr) const;
        [[nodiscard]] int calcSample(bool doEmu);
 
private:
        Y8950& y8950;
        TrackedRam ram;
 
        // copy/pasted from Y8950.hh
        static constexpr int CLOCK_FREQ     = 3579545;
        static constexpr int CLOCK_FREQ_DIV = 72;
        Clock<CLOCK_FREQ, CLOCK_FREQ_DIV> clock;
 
        PlayData emu; // used for emulator behaviour (read back of sample data)
        PlayData aud; // used by audio generation thread
 
        unsigned startAddr;
        unsigned stopAddr;
        unsigned addrMask;
        int volume = 0;
        int volumeWStep;
        int readDelay;
        int delta;
        byte reg7;
        byte reg15;
        bool romBank;
};
SERIALIZE_CLASS_VERSION(Y8950Adpcm, 2);
 
} // namespace openmsx
 
#endif