melonDS/src/SPU.h

277 lines
6.0 KiB
C++

/*
Copyright 2016-2024 melonDS team
This file is part of melonDS.
melonDS is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with melonDS. If not, see http://www.gnu.org/licenses/.
*/
#ifndef SPU_H
#define SPU_H
#include "Savestate.h"
#include "Platform.h"
namespace melonDS
{
class NDS;
class SPU;
enum class AudioBitDepth
{
Auto,
_10Bit,
_16Bit,
};
enum class AudioInterpolation
{
None,
Linear,
Cosine,
Cubic,
SNESGaussian
};
class SPUChannel
{
public:
SPUChannel(u32 num, melonDS::NDS& nds, AudioInterpolation interpolation);
void Reset();
void DoSavestate(Savestate* file);
static const s8 ADPCMIndexTable[8];
static const u16 ADPCMTable[89];
static const s16 PSGTable[8][8];
// audio interpolation is an improvement upon the original hardware
// (which performs no interpolation)
AudioInterpolation InterpType = AudioInterpolation::None;
const u32 Num;
u32 Cnt = 0;
u32 SrcAddr = 0;
u16 TimerReload = 0;
u32 LoopPos = 0;
u32 Length = 0;
u8 Volume = 0;
u8 VolumeShift = 0;
u8 Pan = 0;
bool KeyOn = false;
u32 Timer = 0;
s32 Pos = 0;
s16 PrevSample[3] {};
s16 CurSample = 0;
u16 NoiseVal = 0;
s32 ADPCMVal = 0;
s32 ADPCMIndex = 0;
s32 ADPCMValLoop = 0;
s32 ADPCMIndexLoop = 0;
u8 ADPCMCurByte = 0;
u32 FIFO[8] {};
u32 FIFOReadPos = 0;
u32 FIFOWritePos = 0;
u32 FIFOReadOffset = 0;
u32 FIFOLevel = 0;
void FIFO_BufferData();
template<typename T> T FIFO_ReadData();
void SetCnt(u32 val)
{
u32 oldcnt = Cnt;
Cnt = val & 0xFF7F837F;
Volume = Cnt & 0x7F;
if (Volume == 127) Volume++;
const u8 volshift[4] = {4, 3, 2, 0};
VolumeShift = volshift[(Cnt >> 8) & 0x3];
Pan = (Cnt >> 16) & 0x7F;
if (Pan == 127) Pan++;
if ((val & (1<<31)) && !(oldcnt & (1<<31)))
{
KeyOn = true;
}
}
void SetSrcAddr(u32 val) { SrcAddr = val & 0x07FFFFFC; }
void SetTimerReload(u32 val) { TimerReload = val & 0xFFFF; }
void SetLoopPos(u32 val) { LoopPos = (val & 0xFFFF) << 2; }
void SetLength(u32 val) { Length = (val & 0x001FFFFF) << 2; }
void Start();
void NextSample_PCM8();
void NextSample_PCM16();
void NextSample_ADPCM();
void NextSample_PSG();
void NextSample_Noise();
template<u32 type> s32 Run();
s32 DoRun()
{
switch ((Cnt >> 29) & 0x3)
{
case 0: return Run<0>(); break;
case 1: return Run<1>(); break;
case 2: return Run<2>(); break;
case 3:
if (Num >= 14)
{
return Run<4>();
break;
}
else if (Num >= 8)
{
return Run<3>();
break;
}
[[fallthrough]];
default:
return 0;
}
}
void PanOutput(s32 in, s32& left, s32& right);
private:
melonDS::NDS& NDS;
};
class SPUCaptureUnit
{
public:
SPUCaptureUnit(u32 num, melonDS::NDS&);
void Reset();
void DoSavestate(Savestate* file);
const u32 Num;
u8 Cnt = 0;
u32 DstAddr = 0;
u16 TimerReload = 0;
u32 Length = 0;
u32 Timer = 0;
s32 Pos = 0;
u32 FIFO[4] {};
u32 FIFOReadPos = 0;
u32 FIFOWritePos = 0;
u32 FIFOWriteOffset = 0;
u32 FIFOLevel = 0;
void FIFO_FlushData();
template<typename T> void FIFO_WriteData(T val);
void SetCnt(u8 val)
{
if ((val & 0x80) && !(Cnt & 0x80))
Start();
val &= 0x8F;
if (!(val & 0x80)) val &= ~0x01;
Cnt = val;
}
void SetDstAddr(u32 val) { DstAddr = val & 0x07FFFFFC; }
void SetTimerReload(u32 val) { TimerReload = val & 0xFFFF; }
void SetLength(u32 val) { Length = val << 2; if (Length == 0) Length = 4; }
void Start()
{
Timer = TimerReload;
Pos = 0;
FIFOReadPos = 0;
FIFOWritePos = 0;
FIFOWriteOffset = 0;
FIFOLevel = 0;
}
void Run(s32 sample);
private:
melonDS::NDS& NDS;
};
class SPU
{
public:
explicit SPU(melonDS::NDS& nds, AudioBitDepth bitdepth, AudioInterpolation interpolation);
~SPU();
void Reset();
void DoSavestate(Savestate* file);
void Stop();
void SetPowerCnt(u32 val);
// 0=none 1=linear 2=cosine 3=cubic
void SetInterpolation(AudioInterpolation type);
void SetBias(u16 bias);
void SetDegrade10Bit(bool enable);
void SetDegrade10Bit(AudioBitDepth depth);
void SetApplyBias(bool enable);
void Mix(u32 dummy);
void TrimOutput();
void DrainOutput();
void InitOutput();
int GetOutputSize() const;
void Sync(bool wait);
int ReadOutput(s16* data, int samples);
void TransferOutput();
u8 Read8(u32 addr);
u16 Read16(u32 addr);
u32 Read32(u32 addr);
void Write8(u32 addr, u8 val);
void Write16(u32 addr, u16 val);
void Write32(u32 addr, u32 val);
private:
static const u32 OutputBufferSize = 2*2048;
melonDS::NDS& NDS;
s16 OutputBackbuffer[2 * OutputBufferSize] {};
u32 OutputBackbufferWritePosition = 0;
s16 OutputFrontBuffer[2 * OutputBufferSize] {};
u32 OutputFrontBufferWritePosition = 0;
u32 OutputFrontBufferReadPosition = 0;
Platform::Mutex* AudioLock;
u16 Cnt = 0;
u8 MasterVolume = 0;
u16 Bias = 0;
bool ApplyBias = true;
bool Degrade10Bit = false;
std::array<SPUChannel, 16> Channels;
std::array<SPUCaptureUnit, 2> Capture;
};
}
#endif // SPU_H