1 files changed, 215 insertions, 0 deletions
diff --git a/src/music.c b/src/music.c
new file mode 100644
index 0000000..8997887
--- /dev/null
+++ b/src/music.c
@@ -0,0 +1,215 @@
+#include "global.h"
+#include "m4a.h"
+
+#define NUM_BG_SONGS 128
+
+extern u8 sub_80023E4(u32);
+extern void sub_80118C4(u16);
+extern void sub_809C730();
+
+extern bool8 DisableInterrupts();
+extern bool8 EnableInterrupts();
+
+extern void sub_800C3F8(u16, u16);
+extern void Random();
+extern void sub_800BA5C();
+extern void xxx_update_bg_sound_input();
+
+extern u16 gUnknown_202D688;
+extern u16 gUnknown_202D68A;
+extern u16 gUnknown_202D690;
+extern u8 gUnknown_202D694;
+extern u32 gUnknown_203B0B8;
+extern u16 gUnknown_203B0BC;
+
+bool8 IsBGSong(u32);
+bool8 sub_800CAAC(u32);
+bool8 sub_800CACC(u32);
+u16 sub_800CAE0(u16);
+
+void sub_800C93C(void)
+{
+    bool8 interrupt_flag;
+    u16 temp;
+
+    sub_800C3F8(0x3e5, 0x10);
+    sub_800C3F8(0x3e6, 0x10);
+
+    interrupt_flag = DisableInterrupts();
+    if(gUnknown_202D690 == 0)
+    {
+        if(gUnknown_202D68A != 0x3e7)
+        {
+            temp = gUnknown_202D688 - 1;
+            if(temp <= 1)
+            {
+                if(gUnknown_202D688 == 2)
+                {
+                    gUnknown_202D694 = gUnknown_202D690;
+                }
+                else
+                {
+                    if(gUnknown_202D688 == 1)
+                    {
+                        gUnknown_202D694 = 1;
+                    }
+                }
+                gUnknown_202D688 = 4;
+            }
+        }
+    }
+    m4aMPlayStop(&gUnknown_20008F0);
+    m4aSoundVSyncOff();
+    if(interrupt_flag)
+    {
+        EnableInterrupts();
+    }
+}
+
+void sub_800C9CC(void)
+{
+    bool8 interrupt_flag = DisableInterrupts();
+    m4aSoundVSyncOn();
+    if(gUnknown_202D690 == 0)
+    {
+        if(gUnknown_202D68A != 0x3e7)
+        {
+            if(gUnknown_202D688 == 4)
+            {
+                gUnknown_202D688 = 1;
+                if(gUnknown_202D694 != 0)
+                {
+                    m4aSongNumStart(gUnknown_202D68A);
+                }
+                else
+                {
+                    m4aMPlayContinue(&gUnknown_20008F0);
+                }
+            }
+        }
+    }
+    if(interrupt_flag)
+    {
+        EnableInterrupts();
+    }
+
+}
+
+void nullsub_179(void)
+{
+}
+
+u8 sub_800CA38(u32 songIndex)
+{
+    if(IsBGSong(songIndex))
+    {
+        if(sub_800CAE0(songIndex) == 0)
+        {
+            return 1;
+        }
+    }
+    if(sub_800CACC(songIndex))
+    {
+        if(sub_800CAE0(songIndex) == 1)
+        {
+            return 1;
+        }
+    }
+    else if(sub_800CAAC(songIndex))
+    {
+        if(sub_800CAE0(songIndex) > 1)
+        {
+            return 1;
+        }
+    }
+    return 0;
+}
+
+void nullsub_19(void)
+{
+}
+
+bool8 IsBGSong(u32 songIndex)
+{
+    if(songIndex <= NUM_BG_SONGS)
+    {
+        return TRUE;
+    }
+    return FALSE;
+}
+
+bool8 sub_800CAAC(u32 songIndex)
+{
+    if(songIndex - 300 <= 639)
+    {
+        return TRUE;
+    }
+    return FALSE;
+}
+
+bool8 sub_800CACC(u32 songIndex)
+{
+    if(songIndex - 200 <= 19)
+    {
+        return TRUE;
+    }
+    return FALSE;
+}
+
+u16 sub_800CAE0(u16 songIndex)
+{
+    return gSongTable[songIndex].ms;
+}
+
+bool8 sub_800CAF0(u16 songIndex)
+{
+    // Had to cast this.. m4a_internal header has this as u32
+    if((u16)gMPlayTable[songIndex].info->status == 0)
+    {
+        return 0;
+    }
+    return 1;
+}
+
+void nullsub_20(u16 songIndex)
+{
+}
+
+void nullsub_21(void)
+{
+}
+
+void sub_800CB20(void)
+{
+    sub_800BA5C();
+    gUnknown_203B0B8++;
+    if((gUnknown_203B0BC & 5) != 0)
+    {
+        Random();
+    }
+    Random();
+}
+
+u32 sub_800CB50(void)
+{
+    return gUnknown_203B0B8;
+}
+
+void nullsub_180(void)
+{
+}
+
+void xxx_call_update_bg_sound_input(void)
+{
+    xxx_update_bg_sound_input();
+}
+
+void nullsub_181(void)
+{
+}
+
+u32 sub_800CB70(void)
+{
+    return 0;
+}
+