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55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "IMemoryHandler.h"
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#include "BaseApuChannel.h"
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class Console;
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class DeltaModulationChannel : public BaseApuChannel
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{
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private:
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const uint16_t _dmcPeriodLookupTableNtsc[16] = { 428, 380, 340, 320, 286, 254, 226, 214, 190, 160, 142, 128, 106, 84, 72, 54 };
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const uint16_t _dmcPeriodLookupTablePal[16] = { 398, 354, 316, 298, 276, 236, 210, 198, 176, 148, 132, 118, 98, 78, 66, 50 };
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uint16_t _sampleAddr = 0;
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uint16_t _sampleLength = 0;
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uint8_t _outputLevel = 0;
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bool _irqEnabled = false;
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bool _loopFlag = false;
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uint16_t _currentAddr = 0;
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uint16_t _bytesRemaining = 0;
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uint8_t _readBuffer = 0;
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bool _bufferEmpty = true;
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uint8_t _shiftRegister = 0;
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uint8_t _bitsRemaining = 0;
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bool _silenceFlag = true;
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bool _needToRun = false;
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uint8_t _needInit = 0;
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uint8_t _lastValue4011 = 0;
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void InitSample();
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void Clock() override;
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public:
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DeltaModulationChannel(AudioChannel channel, shared_ptr<Console> console, SoundMixer* mixer);
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virtual void Reset(bool softReset) override;
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virtual void StreamState(bool saving) override;
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bool IrqPending(uint32_t cyclesToRun);
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bool NeedToRun();
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bool GetStatus() override;
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void GetMemoryRanges(MemoryRanges &ranges) override;
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void WriteRAM(uint16_t addr, uint8_t value) override;
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void SetEnabled(bool enabled);
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void StartDmcTransfer();
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uint16_t GetDmcReadAddress();
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void SetDmcReadBuffer(uint8_t value);
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ApuDmcState GetState();
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}; |