lay base for AAC ucode

2025-08-05 04:29:19 -06:00 · 2025-07-30 01:01:57 +02:00
parent 6e8d1d748b
commit f8bf3211ed
6 changed files with 190 additions and 8 deletions
--- a/src/DSP_HLE/AACUcode.cpp
+++ b/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);
+}
+
+
+}
+}