mirror of
https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
129 lines
3.5 KiB
C++
129 lines
3.5 KiB
C++
#include "pch.h"
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#include "SNES/Coprocessors/MSU1/Msu1.h"
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#include "SNES/Spc.h"
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#include "Shared/Emulator.h"
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#include "Shared/Audio/SoundMixer.h"
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#include "Utilities/Serializer.h"
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#include "Utilities/FolderUtilities.h"
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Msu1* Msu1::Init(Emulator* emu, VirtualFile& romFile, Spc* spc)
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{
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string romFolder = romFile.GetFolderPath();
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string romName = FolderUtilities::GetFilename(romFile.GetFileName(), false);
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if(ifstream(FolderUtilities::CombinePath(romFolder, romName + ".msu"))) {
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return new Msu1(emu, romFile, spc);
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} else if(ifstream(FolderUtilities::CombinePath(romFolder, "msu1.rom"))) {
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return new Msu1(emu, romFile, spc);
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} else {
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return nullptr;
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}
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}
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Msu1::Msu1(Emulator* emu, VirtualFile& romFile, Spc* spc)
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{
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_emu = emu;
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_spc = spc;
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_romFolder = romFile.GetFolderPath();
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_romName = FolderUtilities::GetFilename(romFile.GetFileName(), false);
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_dataFile.open(FolderUtilities::CombinePath(_romFolder, _romName) + ".msu", ios::binary);
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if(_dataFile) {
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_trackPath = FolderUtilities::CombinePath(_romFolder, _romName);
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} else {
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_dataFile.open(FolderUtilities::CombinePath(_romFolder, "msu1.rom"), ios::binary);
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_trackPath = FolderUtilities::CombinePath(_romFolder, "track");
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}
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if(_dataFile) {
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_dataFile.seekg(0, ios::end);
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_dataSize = (uint32_t)_dataFile.tellg();
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} else {
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_dataSize = 0;
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}
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_emu->GetSoundMixer()->RegisterAudioProvider(this);
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}
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Msu1::~Msu1()
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{
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_emu->GetSoundMixer()->UnregisterAudioProvider(this);
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}
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void Msu1::Write(uint16_t addr, uint8_t value)
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{
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switch(addr) {
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case 0x2000: _tmpDataPointer = (_tmpDataPointer & 0xFFFFFF00) | value; break;
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case 0x2001: _tmpDataPointer = (_tmpDataPointer & 0xFFFF00FF) | (value << 8); break;
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case 0x2002: _tmpDataPointer = (_tmpDataPointer & 0xFF00FFFF) | (value << 16); break;
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case 0x2003:
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_tmpDataPointer = (_tmpDataPointer & 0x00FFFFFF) | (value << 24);
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_dataPointer = _tmpDataPointer;
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_dataFile.seekg(_dataPointer, ios::beg);
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break;
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case 0x2004: _trackSelect = (_trackSelect & 0xFF00) | value; break;
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case 0x2005:
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_trackSelect = (_trackSelect & 0xFF) | (value << 8);
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LoadTrack();
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break;
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case 0x2006: _volume = value; break;
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case 0x2007:
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if(!_audioBusy) {
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_repeat = (value & 0x02) != 0;
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_paused = (value & 0x01) == 0;
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_pcmReader.SetLoopFlag(_repeat);
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}
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break;
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}
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}
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uint8_t Msu1::Read(uint16_t addr)
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{
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switch(addr) {
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case 0x2000:
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//status
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return (_dataBusy << 7) | (_audioBusy << 6) | (_repeat << 5) | ((!_paused) << 4) | (_trackMissing << 3) | 0x01;
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case 0x2001:
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//data
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if(!_dataBusy && _dataPointer < _dataSize) {
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_dataPointer++;
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return (uint8_t)_dataFile.get();
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}
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return 0;
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case 0x2002: return 'S';
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case 0x2003: return '-';
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case 0x2004: return 'M';
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case 0x2005: return 'S';
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case 0x2006: return 'U';
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case 0x2007: return '1';
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}
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return 0;
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}
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void Msu1::MixAudio(int16_t* buffer, uint32_t sampleCount, uint32_t sampleRate)
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{
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if(!_paused) {
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_pcmReader.SetSampleRate(sampleRate);
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_pcmReader.ApplySamples(buffer, (size_t)sampleCount, _spc->IsMuted() ? 0 : _volume);
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_paused |= _pcmReader.IsPlaybackOver();
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}
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}
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void Msu1::LoadTrack(uint32_t startOffset)
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{
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_trackMissing = !_pcmReader.Init(_trackPath + "-" + std::to_string(_trackSelect) + ".pcm", _repeat, startOffset);
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}
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void Msu1::Serialize(Serializer &s)
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{
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uint32_t offset = _pcmReader.GetOffset();
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SV(_trackSelect); SV(_tmpDataPointer); SV(_dataPointer); SV(_repeat); SV(_paused); SV(_volume); SV(_trackMissing); SV(_audioBusy); SV(_dataBusy); SV(offset);
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if(!s.IsSaving()) {
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_dataFile.seekg(_dataPointer, ios::beg);
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LoadTrack(offset);
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}
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}
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