Y8950Adpcm.hh

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#ifndef Y8950ADPCM_HH
#define Y8950ADPCM_HH

#include "Y8950.hh"
#include "Schedulable.hh"
#include "Clock.hh"
#include "serialize_meta.hh"
#include "openmsx.hh"
#include <memory>

namespace openmsx {

class Y8950;
class DeviceConfig;
class Ram;

class Y8950Adpcm : public Schedulable
{
public:
        Y8950Adpcm(Y8950& y8950, const DeviceConfig& config,
                   const std::string& name, unsigned sampleRam);
        virtual ~Y8950Adpcm();

        void clearRam();
        void reset(EmuTime::param time);
        bool isMuted() const;
        void writeReg(byte rg, byte data, EmuTime::param time);
        byte readReg(byte rg, EmuTime::param time);
        byte peekReg(byte rg, EmuTime::param time);
        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 memPntr;
                unsigned nowStep;
                int out;
                int output;
                int diff;
                int nextLeveling;
                int sampleStep;
                byte adpcm_data;
        };

        // Schedulable
        virtual void executeUntil(EmuTime::param time, int userData);

        void schedule();
        void restart(PlayData& pd);

        bool isPlaying() const;
        void writeData(byte data);
        byte peekReg(byte rg) const;
        byte readData();
        byte peekData() const;
        void writeMemory(unsigned memPntr, byte value);
        byte readMemory(unsigned memPntr) const;
        int calcSample(bool doEmu);

        Y8950& y8950;
        const std::unique_ptr<Ram> ram;

        Clock<Y8950::CLOCK_FREQ, Y8950::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;
        int volumeWStep;
        int readDelay;
        int delta;
        byte reg7;
        byte reg15;
        bool romBank;
};
SERIALIZE_CLASS_VERSION(Y8950Adpcm, 2);

} // namespace openmsx

#endif