lay base for AAC ucode

src/CMakeLists.txt

@@ -59,6 +59,7 @@ add_library(core STATIC
     WifiAP.cpp
 
     DSP_HLE/UcodeBase.cpp
+    DSP_HLE/AACUcode.cpp
     DSP_HLE/GraphicsUcode.cpp
 
     fatfs/ff.c

src/DSP_HLE/AACUcode.cpp

@@ -0,0 +1,130 @@
+/*
+    Copyright 2016-2025 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/.
+*/
+
+#include <algorithm>
+
+#include "../DSi.h"
+#include "AACUcode.h"
+#include "../Platform.h"
+
+
+namespace melonDS
+{
+using Platform::Log;
+using Platform::LogLevel;
+
+namespace DSP_HLE
+{
+
+
+AACUcode::AACUcode(melonDS::DSi& dsi, int version) : UcodeBase(dsi)
+{
+    DSi.RegisterEventFuncs(Event_DSi_DSPHLE, this, {MakeEventThunk(AACUcode, FinishCmd)});
+
+    if (version == -1)
+        Log(LogLevel::Info, "DSP_HLE: initializing AAC decoder ucode (DSi sound app)\n");
+    else
+        Log(LogLevel::Info, "DSP_HLE: initializing AAC SDK ucode version %02X\n", version);
+}
+
+AACUcode::~AACUcode()
+{
+    DSi.UnregisterEventFuncs(Event_DSi_DSPHLE);
+}
+
+void AACUcode::Reset()
+{
+    UcodeBase::Reset();
+
+    CmdState = 0;
+    CmdIndex = 0;
+    CmdParamCount = 0;
+    memset(CmdParams, 0, sizeof(CmdParams));
+}
+
+void AACUcode::DoSavestate(Savestate *file)
+{
+    //
+}
+
+
+void AACUcode::SendData(u8 index, u16 val)
+{
+    UcodeBase::SendData(index, val);
+
+    // CMD1 is used to send commands and parameters
+
+    if (index == 1)
+    {
+        printf("-- CMD1 = %04X, state=%d cmd=%d count=%d\n", val, CmdState,CmdIndex, CmdParamCount);
+        RecvCmdWord();
+    }
+    else if (index == 2)
+    {
+        CmdWritten[2] = false;
+    }
+}
+
+void AACUcode::RecvCmdWord()
+{
+    u16 val = CmdReg[1];
+
+    if (CmdState == 0)
+    {
+        if (val == 1)
+        {
+            CmdState = 1;
+            CmdIndex = val;
+            CmdParamCount = 0;
+        }
+    }
+    else if (CmdState == 1)
+    {
+        CmdParams[CmdParamCount] = val;
+        CmdParamCount++;
+
+        if (CmdParamCount == 10)
+        {
+            // we received all the parameter words, schedule the command
+            // 115000 cycles is the average of the time it takes on hardware
+            // might be different depending on sample rate etc
+
+            CmdState = 2;
+
+            // TODO actually decode shit
+
+            DSi.ScheduleEvent(Event_DSi_DSPHLE, false, 115000, 0, 0);
+        }
+    }
+    else
+        return;
+
+    CmdWritten[1] = false;
+}
+
+void AACUcode::FinishCmd(u32 param)
+{
+    CmdState = 0;
+    CmdParamCount = 0;
+
+    SendReply(0, param);
+}
+
+
+}
+}

src/DSP_HLE/AACUcode.h

@@ -0,0 +1,52 @@
+/*
+    Copyright 2016-2025 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 AACUCODE_H
+#define AACUCODE_H
+
+#include <functional>
+
+#include "UcodeBase.h"
+#include "../Savestate.h"
+
+namespace melonDS::DSP_HLE
+{
+
+class AACUcode : public UcodeBase
+{
+public:
+    AACUcode(melonDS::DSi& dsi, int version);
+    ~AACUcode();
+    void Reset() override;
+    void DoSavestate(Savestate* file) override;
+
+    void SendData(u8 index, u16 val) override;
+
+protected:
+    u8 CmdState;
+    u16 CmdIndex;
+    u8 CmdParamCount;
+    u16 CmdParams[10];
+
+    void RecvCmdWord();
+    void FinishCmd(u32 param);
+};
+
+}
+
+#endif // AACUCODE_H

src/DSP_HLE/GraphicsUcode.cpp

@@ -182,8 +182,7 @@ void GraphicsUcode::FinishCmd(u32 param)
         {
         case 2: CmdScalingBilinear(); break;
         case 3: CmdScalingBicubic(); break;
-        case 10:
-            CmdScalingOneThird(); break;
+        case 10: CmdScalingOneThird(); break;
         default: CmdScalingNearest(); break;
         }
         break;
@@ -451,8 +450,6 @@ void GraphicsUcode::CmdScalingBicubic()
             wy[1] = CalcBicubicWeight(fy);
             wy[2] = CalcBicubicWeight(0x400 - fy);
             wy[3] = CalcBicubicWeight(0x800 - fy);
-            //for (int i = 0; i < 4; i++)
-             //   printf("weight x%d = %08X  y%d = %08X\n", i, wx[i], i, wy[i]);
 
             s64 tr = 0, tg = 0, tb = 0;
 

src/DSP_HLE/GraphicsUcode.h

@@ -24,9 +24,7 @@
 #include "UcodeBase.h"
 #include "../Savestate.h"
 
-namespace melonDS
-{
-namespace DSP_HLE
+namespace melonDS::DSP_HLE
 {
 
 class GraphicsUcode : public UcodeBase
@@ -56,7 +54,6 @@ protected:
     void CmdYuvToRgb();
 };
 
-}
 }
 
 #endif // GRAPHICSUCODE_H

src/DSi_DSP.cpp

@@ -17,6 +17,7 @@
 */
 
 #include "teakra/include/teakra/teakra.h"
+#include "DSP_HLE/AACUcode.h"
 #include "DSP_HLE/GraphicsUcode.h"
 
 #include "DSi.h"
@@ -136,6 +137,10 @@ void DSi_DSP::StartDSPHLE()
 
     switch (crc)
     {
+    case 0x7867C94B: // DSi sound app AAC ucode
+        DSPCore = new DSP_HLE::AACUcode(DSi, -1);
+        break;
+
     case 0xCD2A8B1B: // Graphics SDK ucode v0
         DSPCore = new DSP_HLE::GraphicsUcode(DSi, 0x00);
         break;