SPU: delay channel start until whenever it can actually start. fixes maxmod interpolated mode.

src/NDS.cpp

@@ -493,7 +493,7 @@ void Reset()
         printf("ARM7 BIOS loaded\n");
         fclose(f);
     }
-    
+
 #ifdef JIT_ENABLED
     ARMJIT::Reset();
 #endif

src/SPU.cpp

@@ -160,6 +160,8 @@ void Channel::Reset()
     else
         BusRead32 = NDS::ARM7Read32;
 
+    KeyOn = false;
+
     SetCnt(0);
     SrcAddr = 0;
     TimerReload = 0;
@@ -187,6 +189,7 @@ void Channel::DoSavestate(Savestate* file)
     file->Var8(&VolumeShift);
     file->Var8(&Pan);
 
+    file->Var8((u8*)&KeyOn);
     file->Var32(&Timer);
     file->Var32((u32*)&Pos);
     file->Var16((u16*)&CurSample);
@@ -417,6 +420,12 @@ void Channel::Run(s32* buf, u32 samples)
 {
     if (!(Cnt & (1<<31))) return;
 
+    if (KeyOn)
+    {
+        Start();
+        KeyOn = false;
+    }
+
     for (u32 s = 0; s < samples; s++)
     {
         Timer += 512; // 1 sample = 512 cycles at 16MHz

src/SPU.h

@@ -69,6 +69,7 @@ public:
     u8 VolumeShift;
     u8 Pan;
 
+    bool KeyOn;
     u32 Timer;
     s32 Pos;
     s16 CurSample;
@@ -105,7 +106,7 @@ public:
 
         if ((val & (1<<31)) && !(oldcnt & (1<<31)))
         {
-            Start();
+            KeyOn = true;
         }
     }