convert SPU to OOP

8 files changed, 215 insertions, 201 deletions

diff --git a/src/ARMJIT_Memory.cpp b/src/ARMJIT_Memory.cpp
index a37d7f8..7a1781e 100644
--- a/src/ARMJIT_Memory.cpp
+++ b/src/ARMJIT_Memory.cpp
@@ -1320,7 +1320,7 @@ void* GetFuncForAddr(ARM* cpu, u32 addr, bool store, int size)
         switch (addr & 0xFF800000)
         {
         case 0x04000000:
-            if (addr >= 0x04000400 && addr < 0x04000520)
+            /*if (addr >= 0x04000400 && addr < 0x04000520)
             {
                 switch (size | store)
                 {
@@ -1331,7 +1331,7 @@ void* GetFuncForAddr(ARM* cpu, u32 addr, bool store, int size)
                 case 32: return (void*)SPU::Read32;
                 case 33: return (void*)SPU::Write32;
                 }
-            }
+            }*/
 
             if (NDS::ConsoleType == 0)
             {
diff --git a/src/NDS.cpp b/src/NDS.cpp
index 5a5ba34..3fd8f4c 100644
--- a/src/NDS.cpp
+++ b/src/NDS.cpp
@@ -178,7 +178,8 @@ u32 KeyInput;
 u16 KeyCnt[2];
 u16 RCnt;
 
-SPIHost* SPI;
+class SPU* SPU;
+class SPIHost* SPI;
 class RTC* RTC;
 
 bool Running;
@@ -218,13 +219,13 @@ bool Init()
     DMAs[6] = new DMA(1, 2);
     DMAs[7] = new DMA(1, 3);
 
-    SPI = new SPIHost();
+    SPU = new class SPU;
+    SPI = new class SPIHost();
     RTC = new class RTC();
 
     if (!NDSCart::Init()) return false;
     if (!GBACart::Init()) return false;
     if (!GPU::Init()) return false;
-    if (!SPU::Init()) return false;
     if (!Wifi::Init()) return false;
 
     if (!DSi::Init()) return false;
@@ -240,11 +241,8 @@ void DeInit()
     ARMJIT::DeInit();
 #endif
 
-    delete ARM9;
-    ARM9 = nullptr;
-
-    delete ARM7;
-    ARM7 = nullptr;
+    delete ARM9; ARM9 = nullptr;
+    delete ARM7; ARM7 = nullptr;
 
     for (int i = 0; i < 8; i++)
     {
@@ -252,16 +250,13 @@ void DeInit()
         DMAs[i] = nullptr;
     }
 
-    delete SPI;
-    SPI = nullptr;
-
-    delete RTC;
-    RTC = nullptr;
+    delete SPU; SPU = nullptr;
+    delete SPI; SPI = nullptr;
+    delete RTC; RTC = nullptr;
 
     NDSCart::DeInit();
     GBACart::DeInit();
     GPU::DeInit();
-    SPU::DeInit();
     Wifi::DeInit();
 
     DSi::DeInit();
@@ -529,7 +524,7 @@ void SetupDirectBoot(const std::string& romname)
 
     NDSCart::SPICnt = 0x8000;
 
-    SPU::SetBias(0x200);
+    SPU->SetBias(0x200);
 
     SetWifiWaitCnt(0x0030);
 }
@@ -648,7 +643,7 @@ void Reset()
     NDSCart::Reset();
     GBACart::Reset();
     GPU::Reset();
-    SPU::Reset();
+    SPU->Reset();
     SPI->Reset();
     RTC->Reset();
     Wifi::Reset();
@@ -656,7 +651,7 @@ void Reset()
     // TODO: move the SOUNDBIAS/degrade logic to SPU?
 
     // The SOUNDBIAS register does nothing on DSi
-    SPU::SetApplyBias(ConsoleType == 0);
+    SPU->SetApplyBias(ConsoleType == 0);
 
     bool degradeAudio = true;
 
@@ -673,7 +668,7 @@ void Reset()
     else if (bitDepth == 2) // Always 16-bit
         degradeAudio = false;
 
-    SPU::SetDegrade10Bit(degradeAudio);
+    SPU->SetDegrade10Bit(degradeAudio);
 
     AREngine::Reset();
 }
@@ -722,7 +717,7 @@ void Stop(Platform::StopReason reason)
     Running = false;
     Platform::SignalStop(reason);
     GPU::Stop();
-    SPU::Stop();
+    SPU->Stop();
 
     if (ConsoleType == 1)
         DSi::Stop();
@@ -850,7 +845,7 @@ bool DoSavestate(Savestate* file)
     if (ConsoleType == 0)
         GBACart::DoSavestate(file);
     GPU::DoSavestate(file);
-    SPU::DoSavestate(file);
+    SPU->DoSavestate(file);
     SPI->DoSavestate(file);
     RTC->DoSavestate(file);
     Wifi::DoSavestate(file);
@@ -862,7 +857,7 @@ bool DoSavestate(Savestate* file)
     {
         GPU::SetPowerCnt(PowerControl9);
 
-        SPU::SetPowerCnt(PowerControl7 & 0x0001);
+        SPU->SetPowerCnt(PowerControl7 & 0x0001);
         Wifi::SetPowerCnt(PowerControl7 & 0x0002);
     }
 
@@ -1193,7 +1188,7 @@ u32 RunFrame()
             ARM7Timestamp-SysTimestamp,
             GPU3D::Timestamp-SysTimestamp);
 #endif
-        SPU::TransferOutput();
+        SPU->TransferOutput();
         break;
     }
 
@@ -3922,7 +3917,7 @@ u8 ARM7IORead8(u32 addr)
 
     if (addr >= 0x04000400 && addr < 0x04000520)
     {
-        return SPU::Read8(addr);
+        return SPU->Read8(addr);
     }
 
     if ((addr & 0xFFFFF000) != 0x04004000)
@@ -4016,7 +4011,7 @@ u16 ARM7IORead16(u32 addr)
 
     if (addr >= 0x04000400 && addr < 0x04000520)
     {
-        return SPU::Read16(addr);
+        return SPU->Read16(addr);
     }
 
     if ((addr & 0xFFFFF000) != 0x04004000)
@@ -4117,7 +4112,7 @@ u32 ARM7IORead32(u32 addr)
 
     if (addr >= 0x04000400 && addr < 0x04000520)
     {
-        return SPU::Read32(addr);
+        return SPU->Read32(addr);
     }
 
     if ((addr & 0xFFFFF000) != 0x04004000)
@@ -4195,7 +4190,7 @@ void ARM7IOWrite8(u32 addr, u8 val)
 
     if (addr >= 0x04000400 && addr < 0x04000520)
     {
-        SPU::Write8(addr, val);
+        SPU->Write8(addr, val);
         return;
     }
 
@@ -4336,7 +4331,7 @@ void ARM7IOWrite16(u32 addr, u16 val)
         {
             u16 change = PowerControl7 ^ val;
             PowerControl7 = val & 0x0003;
-            SPU::SetPowerCnt(val & 0x0001);
+            SPU->SetPowerCnt(val & 0x0001);
             Wifi::SetPowerCnt(val & 0x0002);
             if (change & 0x0002) UpdateWifiTimings();
         }
@@ -4350,7 +4345,7 @@ void ARM7IOWrite16(u32 addr, u16 val)
 
     if (addr >= 0x04000400 && addr < 0x04000520)
     {
-        SPU::Write16(addr, val);
+        SPU->Write16(addr, val);
         return;
     }
 
@@ -4466,7 +4461,7 @@ void ARM7IOWrite32(u32 addr, u32 val)
         {
             u16 change = PowerControl7 ^ val;
             PowerControl7 = val & 0x0003;
-            SPU::SetPowerCnt(val & 0x0001);
+            SPU->SetPowerCnt(val & 0x0001);
             Wifi::SetPowerCnt(val & 0x0002);
             if (change & 0x0002) UpdateWifiTimings();
         }
@@ -4484,7 +4479,7 @@ void ARM7IOWrite32(u32 addr, u32 val)
 
     if (addr >= 0x04000400 && addr < 0x04000520)
     {
-        SPU::Write32(addr, val);
+        SPU->Write32(addr, val);
         return;
     }
 
diff --git a/src/NDS.h b/src/NDS.h
index b5d7227..cffcd5d 100644
--- a/src/NDS.h
+++ b/src/NDS.h
@@ -30,6 +30,7 @@
 // with this enabled, to make sure it doesn't desync
 //#define DEBUG_CHECK_DESYNC
 
+class SPU;
 class SPIHost;
 class RTC;
 
@@ -249,7 +250,8 @@ extern MemRegion SWRAM_ARM7;
 extern u32 KeyInput;
 extern u16 RCnt;
 
-extern SPIHost* SPI;
+extern class SPU* SPU;
+extern class SPIHost* SPI;
 extern class RTC* RTC;
 
 const u32 ARM7WRAMSize = 0x10000;
diff --git a/src/SPI.cpp b/src/SPI.cpp
index 4b72f5c..a95cd1c 100644
--- a/src/SPI.cpp
+++ b/src/SPI.cpp
@@ -533,7 +533,11 @@ SPIHost::SPIHost()
 
     Devices[SPIDevice_FirmwareMem] = new FirmwareMem(this);
     Devices[SPIDevice_PowerMan] = new PowerMan(this);
-    Devices[SPIDevice_TSC] = nullptr;
+
+    if (NDS::ConsoleType == 1)
+        Devices[SPIDevice_TSC] = new DSi_TSC(this);
+    else
+        Devices[SPIDevice_TSC] = new TSC(this);
 }
 
 SPIHost::~SPIHost()
@@ -553,14 +557,6 @@ void SPIHost::Reset()
 {
     Cnt = 0;
 
-    if (Devices[SPIDevice_TSC])
-        delete Devices[SPIDevice_TSC];
-
-    if (NDS::ConsoleType == 1)
-        Devices[SPIDevice_TSC] = new DSi_TSC(this);
-    else
-        Devices[SPIDevice_TSC] = new TSC(this);
-
     for (int i = 0; i < SPIDevice_MAX; i++)
     {
         Devices[i]->Reset();
diff --git a/src/SPU.cpp b/src/SPU.cpp
index bfe6622..89b7fb3 100644
--- a/src/SPU.cpp
+++ b/src/SPU.cpp
@@ -32,12 +32,10 @@ using Platform::LogLevel;
 // * capture addition modes, overflow bugs
 // * channel hold
 
-namespace SPU
-{
 
-const s8 ADPCMIndexTable[8] = {-1, -1, -1, -1, 2, 4, 6, 8};
+const s8 SPUChannel::ADPCMIndexTable[8] = {-1, -1, -1, -1, 2, 4, 6, 8};
 
-const u16 ADPCMTable[89] =
+const u16 SPUChannel::ADPCMTable[89] =
 {
     0x0007, 0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E,
     0x0010, 0x0011, 0x0013, 0x0015, 0x0017, 0x0019, 0x001C, 0x001F,
@@ -53,7 +51,7 @@ const u16 ADPCMTable[89] =
     0x7FFF
 };
 
-const s16 PSGTable[8][8] =
+const s16 SPUChannel::PSGTable[8][8] =
 {
     {-0x7FFF, -0x7FFF, -0x7FFF, -0x7FFF, -0x7FFF, -0x7FFF, -0x7FFF,  0x7FFF},
     {-0x7FFF, -0x7FFF, -0x7FFF, -0x7FFF, -0x7FFF, -0x7FFF,  0x7FFF,  0x7FFF},
@@ -65,76 +63,63 @@ const s16 PSGTable[8][8] =
     {-0x7FFF, -0x7FFF, -0x7FFF, -0x7FFF, -0x7FFF, -0x7FFF, -0x7FFF, -0x7FFF}
 };
 
-// audio interpolation is an improvement upon the original hardware
-// (which performs no interpolation)
-int InterpType;
-s16 InterpCos[0x100];
-s16 InterpCubic[0x100][4];
-
-const u32 OutputBufferSize = 2*2048;
-s16 OutputBackbuffer[2 * OutputBufferSize];
-u32 OutputBackbufferWritePosition;
-
-s16 OutputFrontBuffer[2 * OutputBufferSize];
-u32 OutputFrontBufferWritePosition;
-u32 OutputFrontBufferReadPosition;
-
-Platform::Mutex* AudioLock;
+s16 SPUChannel::InterpCos[0x100];
+s16 SPUChannel::InterpCubic[0x100][4];
+bool SPUChannel::InterpInited = false;
 
-u16 Cnt;
-u8 MasterVolume;
-u16 Bias;
-bool ApplyBias;
-bool Degrade10Bit;
 
-Channel* Channels[16];
-CaptureUnit* Capture[2];
-
-
-bool Init()
+SPU::SPU()
 {
-    NDS::RegisterEventFunc(NDS::Event_SPU, 0, Mix);
+    NDS::RegisterEventFunc(NDS::Event_SPU, 0, MemberEventFunc(SPU, Mix));
 
     for (int i = 0; i < 16; i++)
-        Channels[i] = new Channel(i);
+        Channels[i] = new SPUChannel(i);
 
-    Capture[0] = new CaptureUnit(0);
-    Capture[1] = new CaptureUnit(1);
+    Capture[0] = new SPUCaptureUnit(0);
+    Capture[1] = new SPUCaptureUnit(1);
 
     AudioLock = Platform::Mutex_Create();
 
-    InterpType = 0;
     ApplyBias = true;
     Degrade10Bit = false;
 
-    // generate interpolation tables
-    // values are 1:1:14 fixed-point
+    memset(OutputFrontBuffer, 0, 2*OutputBufferSize*2);
 
-    float m_pi = std::acos(-1.0f);
-    for (int i = 0; i < 0x100; i++)
+    OutputBackbufferWritePosition = 0;
+    OutputFrontBufferReadPosition = 0;
+    OutputFrontBufferWritePosition = 0;
+
+    if (!SPUChannel::InterpInited)
     {
-        float ratio = (i * m_pi) / 255.0f;
-        ratio = 1.0f - std::cos(ratio);
+        // generate interpolation tables
+        // values are 1:1:14 fixed-point
 
-        InterpCos[i] = (s16)(ratio * 0x2000);
-    }
+        float m_pi = std::acos(-1.0f);
+        for (int i = 0; i < 0x100; i++)
+        {
+            float ratio = (i * m_pi) / 255.0f;
+            ratio = 1.0f - std::cos(ratio);
 
-    for (int i = 0; i < 0x100; i++)
-    {
-        s32 i1 = i << 6;
-        s32 i2 = (i * i) >> 2;
-        s32 i3 = (i * i * i) >> 10;
-
-        InterpCubic[i][0] = -i3 + 2*i2 - i1;
-        InterpCubic[i][1] = i3 - 2*i2 + 0x4000;
-        InterpCubic[i][2] = -i3 + i2 + i1;
-        InterpCubic[i][3] = i3 - i2;
-    }
+            SPUChannel::InterpCos[i] = (s16)(ratio * 0x2000);
+        }
 
-    return true;
+        for (int i = 0; i < 0x100; i++)
+        {
+            s32 i1 = i << 6;
+            s32 i2 = (i * i) >> 2;
+            s32 i3 = (i * i * i) >> 10;
+
+            SPUChannel::InterpCubic[i][0] = -i3 + 2*i2 - i1;
+            SPUChannel::InterpCubic[i][1] = i3 - 2*i2 + 0x4000;
+            SPUChannel::InterpCubic[i][2] = -i3 + i2 + i1;
+            SPUChannel::InterpCubic[i][3] = i3 - i2;
+        }
+
+        SPUChannel::InterpInited = true;
+    }
 }
 
-void DeInit()
+SPU::~SPU()
 {
     for (int i = 0; i < 16; i++)
     {
@@ -153,7 +138,7 @@ void DeInit()
     NDS::UnregisterEventFunc(NDS::Event_SPU, 0);
 }
 
-void Reset()
+void SPU::Reset()
 {
     InitOutput();
 
@@ -170,7 +155,7 @@ void Reset()
     NDS::ScheduleEvent(NDS::Event_SPU, false, 1024, 0, 0);
 }
 
-void Stop()
+void SPU::Stop()
 {
     Platform::Mutex_Lock(AudioLock);
     memset(OutputFrontBuffer, 0, 2*OutputBufferSize*2);
@@ -181,7 +166,7 @@ void Stop()
     Platform::Mutex_Unlock(AudioLock);
 }
 
-void DoSavestate(Savestate* file)
+void SPU::DoSavestate(Savestate* file)
 {
     file->Section("SPU.");
 
@@ -197,43 +182,46 @@ void DoSavestate(Savestate* file)
 }
 
 
-void SetPowerCnt(u32 val)
+void SPU::SetPowerCnt(u32 val)
 {
     // TODO
 }
 
 
-void SetInterpolation(int type)
+void SPU::SetInterpolation(int type)
 {
-    InterpType = type;
+    for (int i = 0; i < 16; i++)
+        Channels[i]->InterpType = type;
 }
 
-void SetBias(u16 bias)
+void SPU::SetBias(u16 bias)
 {
     Bias = bias;
 }
 
-void SetApplyBias(bool enable)
+void SPU::SetApplyBias(bool enable)
 {
     ApplyBias = enable;
 }
 
-void SetDegrade10Bit(bool enable)
+void SPU::SetDegrade10Bit(bool enable)
 {
     Degrade10Bit = enable;
 }
 
 
-Channel::Channel(u32 num)
+SPUChannel::SPUChannel(u32 num)
 {
     Num = num;
+
+    InterpType = 0;
 }
 
-Channel::~Channel()
+SPUChannel::~SPUChannel()
 {
 }
 
-void Channel::Reset()
+void SPUChannel::Reset()
 {
     if (NDS::ConsoleType == 1)
         BusRead32 = DSi::ARM7Read32;
@@ -257,7 +245,7 @@ void Channel::Reset()
     FIFOLevel = 0;
 }
 
-void Channel::DoSavestate(Savestate* file)
+void SPUChannel::DoSavestate(Savestate* file)
 {
     file->Var32(&Cnt);
     file->Var32(&SrcAddr);
@@ -289,7 +277,7 @@ void Channel::DoSavestate(Savestate* file)
     file->VarArray(FIFO, sizeof(FIFO));
 }
 
-void Channel::FIFO_BufferData()
+void SPUChannel::FIFO_BufferData()
 {
     u32 totallen = LoopPos + Length;
 
@@ -330,7 +318,7 @@ void Channel::FIFO_BufferData()
 }
 
 template<typename T>
-T Channel::FIFO_ReadData()
+T SPUChannel::FIFO_ReadData()
 {
     T ret = *(T*)&((u8*)FIFO)[FIFOReadPos];
 
@@ -344,7 +332,7 @@ T Channel::FIFO_ReadData()
     return ret;
 }
 
-void Channel::Start()
+void SPUChannel::Start()
 {
     Timer = TimerReload;
 
@@ -372,7 +360,7 @@ void Channel::Start()
     }
 }
 
-void Channel::NextSample_PCM8()
+void SPUChannel::NextSample_PCM8()
 {
     Pos++;
     if (Pos < 0) return;
@@ -395,7 +383,7 @@ void Channel::NextSample_PCM8()
     CurSample = val << 8;
 }
 
-void Channel::NextSample_PCM16()
+void SPUChannel::NextSample_PCM16()
 {
     Pos++;
     if (Pos < 0) return;
@@ -418,7 +406,7 @@ void Channel::NextSample_PCM16()
     CurSample = val;
 }
 
-void Channel::NextSample_ADPCM()
+void SPUChannel::NextSample_ADPCM()
 {
     Pos++;
     if (Pos < 8)
@@ -493,13 +481,13 @@ void Channel::NextSample_ADPCM()
     CurSample = ADPCMVal;
 }
 
-void Channel::NextSample_PSG()
+void SPUChannel::NextSample_PSG()
 {
     Pos++;
     CurSample = PSGTable[(Cnt >> 24) & 0x7][Pos & 0x7];
 }
 
-void Channel::NextSample_Noise()
+void SPUChannel::NextSample_Noise()
 {
     if (NoiseVal & 0x1)
     {
@@ -514,7 +502,7 @@ void Channel::NextSample_Noise()
 }
 
 template<u32 type>
-s32 Channel::Run()
+s32 SPUChannel::Run()
 {
     if (!(Cnt & (1<<31))) return 0;
 
@@ -586,23 +574,23 @@ s32 Channel::Run()
     return val;
 }
 
-void Channel::PanOutput(s32 in, s32& left, s32& right)
+void SPUChannel::PanOutput(s32 in, s32& left, s32& right)
 {
     left += ((s64)in * (128-Pan)) >> 10;
     right += ((s64)in * Pan) >> 10;
 }
 
 
-CaptureUnit::CaptureUnit(u32 num)
+SPUCaptureUnit::SPUCaptureUnit(u32 num)
 {
     Num = num;
 }
 
-CaptureUnit::~CaptureUnit()
+SPUCaptureUnit::~SPUCaptureUnit()
 {
 }
 
-void CaptureUnit::Reset()
+void SPUCaptureUnit::Reset()
 {
     if (NDS::ConsoleType == 1)
         BusWrite32 = DSi::ARM7Write32;
@@ -623,7 +611,7 @@ void CaptureUnit::Reset()
     FIFOLevel = 0;
 }
 
-void CaptureUnit::DoSavestate(Savestate* file)
+void SPUCaptureUnit::DoSavestate(Savestate* file)
 {
     file->Var8(&Cnt);
     file->Var32(&DstAddr);
@@ -640,7 +628,7 @@ void CaptureUnit::DoSavestate(Savestate* file)
     file->VarArray(FIFO, 4*4);
 }
 
-void CaptureUnit::FIFO_FlushData()
+void SPUCaptureUnit::FIFO_FlushData()
 {
     for (u32 i = 0; i < 4; i++)
     {
@@ -660,7 +648,7 @@ void CaptureUnit::FIFO_FlushData()
 }
 
 template<typename T>
-void CaptureUnit::FIFO_WriteData(T val)
+void SPUCaptureUnit::FIFO_WriteData(T val)
 {
     *(T*)&((u8*)FIFO)[FIFOWritePos] = val;
 
@@ -672,7 +660,7 @@ void CaptureUnit::FIFO_WriteData(T val)
         FIFO_FlushData();
 }
 
-void CaptureUnit::Run(s32 sample)
+void SPUCaptureUnit::Run(s32 sample)
 {
     Timer += 512;
 
@@ -725,7 +713,7 @@ void CaptureUnit::Run(s32 sample)
 }
 
 
-void Mix(u32 dummy)
+void SPU::Mix(u32 dummy)
 {
     s32 left = 0, right = 0;
     s32 leftoutput = 0, rightoutput = 0;
@@ -746,7 +734,7 @@ void Mix(u32 dummy)
 
         for (int i = 4; i < 16; i++)
         {
-            Channel* chan = Channels[i];
+            SPUChannel* chan = Channels[i];
 
             s32 channel = chan->DoRun();
             chan->PanOutput(channel, left, right);
@@ -871,7 +859,7 @@ void Mix(u32 dummy)
     NDS::ScheduleEvent(NDS::Event_SPU, true, 1024, 0, 0);
 }
 
-void TransferOutput()
+void SPU::TransferOutput()
 {
     Platform::Mutex_Lock(AudioLock);
     for (u32 i = 0; i < OutputBackbufferWritePosition; i += 2)
@@ -889,10 +877,10 @@ void TransferOutput()
         }
     }
     OutputBackbufferWritePosition = 0;
-    Platform::Mutex_Unlock(AudioLock);
+    Platform::Mutex_Unlock(AudioLock);;
 }
 
-void TrimOutput()
+void SPU::TrimOutput()
 {
     Platform::Mutex_Lock(AudioLock);
     const int halflimit = (OutputBufferSize / 2);
@@ -904,7 +892,7 @@ void TrimOutput()
     Platform::Mutex_Unlock(AudioLock);
 }
 
-void DrainOutput()
+void SPU::DrainOutput()
 {
     Platform::Mutex_Lock(AudioLock);
     OutputFrontBufferWritePosition = 0;
@@ -912,7 +900,7 @@ void DrainOutput()
     Platform::Mutex_Unlock(AudioLock);
 }
 
-void InitOutput()
+void SPU::InitOutput()
 {
     Platform::Mutex_Lock(AudioLock);
     memset(OutputBackbuffer, 0, 2*OutputBufferSize*2);
@@ -922,7 +910,7 @@ void InitOutput()
     Platform::Mutex_Unlock(AudioLock);
 }
 
-int GetOutputSize()
+int SPU::GetOutputSize()
 {
     Platform::Mutex_Lock(AudioLock);
 
@@ -938,7 +926,7 @@ int GetOutputSize()
     return ret;
 }
 
-void Sync(bool wait)
+void SPU::Sync(bool wait)
 {
     // this function is currently not used anywhere
     // depending on the usage context the thread safety measures could be made
@@ -968,7 +956,7 @@ void Sync(bool wait)
     }
 }
 
-int ReadOutput(s16* data, int samples)
+int SPU::ReadOutput(s16* data, int samples)
 {
     Platform::Mutex_Lock(AudioLock);
     if (OutputFrontBufferReadPosition == OutputFrontBufferWritePosition)
@@ -997,11 +985,11 @@ int ReadOutput(s16* data, int samples)
 }
 
 
-u8 Read8(u32 addr)
+u8 SPU::Read8(u32 addr)
 {
     if (addr < 0x04000500)
     {
-        Channel* chan = Channels[(addr >> 4) & 0xF];
+        SPUChannel* chan = Channels[(addr >> 4) & 0xF];
 
         switch (addr & 0xF)
         {
@@ -1027,11 +1015,11 @@ u8 Read8(u32 addr)
     return 0;
 }
 
-u16 Read16(u32 addr)
+u16 SPU::Read16(u32 addr)
 {
     if (addr < 0x04000500)
     {
-        Channel* chan = Channels[(addr >> 4) & 0xF];
+        SPUChannel* chan = Channels[(addr >> 4) & 0xF];
 
         switch (addr & 0xF)
         {
@@ -1054,11 +1042,11 @@ u16 Read16(u32 addr)
     return 0;
 }
 
-u32 Read32(u32 addr)
+u32 SPU::Read32(u32 addr)
 {
     if (addr < 0x04000500)
     {
-        Channel* chan = Channels[(addr >> 4) & 0xF];
+        SPUChannel* chan = Channels[(addr >> 4) & 0xF];
 
         switch (addr & 0xF)
         {
@@ -1083,11 +1071,11 @@ u32 Read32(u32 addr)
     return 0;
 }
 
-void Write8(u32 addr, u8 val)
+void SPU::Write8(u32 addr, u8 val)
 {
     if (addr < 0x04000500)
     {
-        Channel* chan = Channels[(addr >> 4) & 0xF];
+        SPUChannel* chan = Channels[(addr >> 4) & 0xF];
 
         switch (addr & 0xF)
         {
@@ -1124,11 +1112,11 @@ void Write8(u32 addr, u8 val)
     Log(LogLevel::Warn, "unknown SPU write8 %08X %02X\n", addr, val);
 }
 
-void Write16(u32 addr, u16 val)
+void SPU::Write16(u32 addr, u16 val)
 {
     if (addr < 0x04000500)
     {
-        Channel* chan = Channels[(addr >> 4) & 0xF];
+        SPUChannel* chan = Channels[(addr >> 4) & 0xF];
 
         switch (addr & 0xF)
         {
@@ -1173,11 +1161,11 @@ void Write16(u32 addr, u16 val)
     Log(LogLevel::Warn, "unknown SPU write16 %08X %04X\n", addr, val);
 }
 
-void Write32(u32 addr, u32 val)
+void SPU::Write32(u32 addr, u32 val)
 {
     if (addr < 0x04000500)
     {
-        Channel* chan = Channels[(addr >> 4) & 0xF];
+        SPUChannel* chan = Channels[(addr >> 4) & 0xF];
 
         switch (addr & 0xF)
         {
@@ -1220,5 +1208,3 @@ void Write32(u32 addr, u32 val)
         }
     }
 }
-
-}
diff --git a/src/SPU.h b/src/SPU.h
index 12cba61..407a3f6 100644
--- a/src/SPU.h
+++ b/src/SPU.h
@@ -20,51 +20,30 @@
 #define SPU_H
 
 #include "Savestate.h"
+#include "Platform.h"
 
-namespace SPU
-{
-
-bool Init();
-void DeInit();
-void Reset();
-void Stop();
-
-void DoSavestate(Savestate* file);
-
-void SetPowerCnt(u32 val);
-
-// 0=none 1=linear 2=cosine 3=cubic
-void SetInterpolation(int type);
-
-void SetBias(u16 bias);
-void SetDegrade10Bit(bool enable);
-void SetApplyBias(bool enable);
-
-void Mix(u32 dummy);
-
-void TrimOutput();
-void DrainOutput();
-void InitOutput();
-int GetOutputSize();
-void Sync(bool wait);
-int ReadOutput(s16* data, int samples);
-void TransferOutput();
+class SPU;
 
-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);
-
-class Channel
+class SPUChannel
 {
 public:
-    Channel(u32 num);
-    ~Channel();
+    SPUChannel(u32 num);
+    ~SPUChannel();
     void Reset();
     void DoSavestate(Savestate* file);
 
+    static const s8 ADPCMIndexTable[8];
+    static const u16 ADPCMTable[89];
+    static const s16 PSGTable[8][8];
+
+    static s16 InterpCos[0x100];
+    static s16 InterpCubic[0x100][4];
+    static bool InterpInited;
+
+    // audio interpolation is an improvement upon the original hardware
+    // (which performs no interpolation)
+    int InterpType;
+
     u32 Num;
 
     u32 Cnt;
@@ -164,11 +143,11 @@ private:
     u32 (*BusRead32)(u32 addr);
 };
 
-class CaptureUnit
+class SPUCaptureUnit
 {
 public:
-    CaptureUnit(u32 num);
-    ~CaptureUnit();
+    SPUCaptureUnit(u32 num);
+    ~SPUCaptureUnit();
     void Reset();
     void DoSavestate(Savestate* file);
 
@@ -221,6 +200,61 @@ private:
     void (*BusWrite32)(u32 addr, u32 val);
 };
 
-}
+class SPU
+{
+public:
+    SPU();
+    ~SPU();
+    void Reset();
+    void DoSavestate(Savestate* file);
+
+    void Stop();
+
+    void SetPowerCnt(u32 val);
+
+    // 0=none 1=linear 2=cosine 3=cubic
+    void SetInterpolation(int type);
+
+    void SetBias(u16 bias);
+    void SetDegrade10Bit(bool enable);
+    void SetApplyBias(bool enable);
+
+    void Mix(u32 dummy);
+
+    void TrimOutput();
+    void DrainOutput();
+    void InitOutput();
+    int GetOutputSize();
+    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;
+    s16 OutputBackbuffer[2 * OutputBufferSize];
+    u32 OutputBackbufferWritePosition;
+
+    s16 OutputFrontBuffer[2 * OutputBufferSize];
+    u32 OutputFrontBufferWritePosition;
+    u32 OutputFrontBufferReadPosition;
+
+    Platform::Mutex* AudioLock;
+
+    u16 Cnt;
+    u8 MasterVolume;
+    u16 Bias;
+    bool ApplyBias;
+    bool Degrade10Bit;
+
+    SPUChannel* Channels[16];
+    SPUCaptureUnit* Capture[2];
+};
 
 #endif // SPU_H
diff --git a/src/frontend/qt_sdl/AudioInOut.cpp b/src/frontend/qt_sdl/AudioInOut.cpp
index 120ff5f..7faac9f 100644
--- a/src/frontend/qt_sdl/AudioInOut.cpp
+++ b/src/frontend/qt_sdl/AudioInOut.cpp
@@ -22,6 +22,7 @@
 
 #include "FrontendUtil.h"
 #include "Config.h"
+#include "NDS.h"
 #include "SPU.h"
 #include "Platform.h"
 #include "Input.h"
@@ -54,7 +55,7 @@ void AudioCallback(void* data, Uint8* stream, int len)
     int num_in;
 
     SDL_LockMutex(audioSyncLock);
-    num_in = SPU::ReadOutput(buf_in, len_in);
+    num_in = NDS::SPU->ReadOutput(buf_in, len_in);
     SDL_CondSignal(audioSync);
     SDL_UnlockMutex(audioSyncLock);
 
@@ -352,7 +353,7 @@ void AudioSync()
     if (audioDevice)
     {
         SDL_LockMutex(audioSyncLock);
-        while (SPU::GetOutputSize() > 1024)
+        while (NDS::SPU->GetOutputSize() > 1024)
         {
             int ret = SDL_CondWaitTimeout(audioSync, audioSyncLock, 500);
             if (ret == SDL_MUTEX_TIMEDOUT) break;
@@ -365,7 +366,7 @@ void UpdateSettings()
 {
     MicClose();
 
-    SPU::SetInterpolation(Config::AudioInterp);
+    NDS::SPU->SetInterpolation(Config::AudioInterp);
     SetupMicInputData();
 
     MicOpen();
diff --git a/src/frontend/qt_sdl/main.cpp b/src/frontend/qt_sdl/main.cpp
index dcd52bd..700caea 100644
--- a/src/frontend/qt_sdl/main.cpp
+++ b/src/frontend/qt_sdl/main.cpp
@@ -342,7 +342,7 @@ void EmuThread::run()
     GPU::InitRenderer(videoRenderer);
     GPU::SetRenderSettings(videoRenderer, videoSettings);
 
-    SPU::SetInterpolation(Config::AudioInterp);
+    NDS::SPU->SetInterpolation(Config::AudioInterp);
 
     Input::Init();
 
@@ -2942,12 +2942,12 @@ void MainWindow::onPathSettingsFinished(int res)
 
 void MainWindow::onUpdateAudioSettings()
 {
-    SPU::SetInterpolation(Config::AudioInterp);
+    NDS::SPU->SetInterpolation(Config::AudioInterp);
 
     if (Config::AudioBitDepth == 0)
-        SPU::SetDegrade10Bit(NDS::ConsoleType == 0);
+        NDS::SPU->SetDegrade10Bit(NDS::ConsoleType == 0);
     else
-        SPU::SetDegrade10Bit(Config::AudioBitDepth == 1);
+        NDS::SPU->SetDegrade10Bit(Config::AudioBitDepth == 1);
 }
 
 void MainWindow::onAudioSettingsFinished(int res)