From 20d28e80a5c861a9d5f449ea911ab75b4f37ad0d Mon Sep 17 00:00:00 2001
From: Jef <jef@targetspot.com>
Date: Tue, 24 Sep 2024 14:54:57 +0200
Subject: Initial community commit

---
 Src/Plugins/Input/in_midi/mids.cpp | 96 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 Src/Plugins/Input/in_midi/mids.cpp

(limited to 'Src/Plugins/Input/in_midi/mids.cpp')

diff --git a/Src/Plugins/Input/in_midi/mids.cpp b/Src/Plugins/Input/in_midi/mids.cpp
new file mode 100644
index 00000000..456da30f
--- /dev/null
+++ b/Src/Plugins/Input/in_midi/mids.cpp
@@ -0,0 +1,96 @@
+#include "main.h"
+#include "cvt.h"
+
+bool is_mids(const BYTE* buf,size_t s)
+{
+	return s>0x20 && *(DWORD*)buf==_rv('RIFF') && *(DWORD*)(buf+8)==_rv('MIDS') && *(DWORD*)(buf+12)==_rv('fmt ');
+}
+
+typedef struct
+{
+    DWORD           dwTimeFormat;
+    DWORD           cbMaxBuffer;
+    DWORD           dwFlags;
+} MIDSFMT;
+
+
+#define WRITE(X,Y) out.write(X,Y)
+
+#define WRITE_DELTA(X) gb_write_delta(out,X)
+
+#define D_WRITE {WRITE_DELTA(ct-tw);tw=ct;}
+
+bool load_mids(MIDI_file* mf,const BYTE* buf,size_t sz)
+{
+	if (sz<*(long*)(buf+4)+8) return 0;
+	MIDSFMT* fmt=(MIDSFMT*)(buf+0x14);
+	DWORD ofs;
+	ofs=*(DWORD*)(buf+0x10)+0x14;
+	if (*(DWORD*)(buf+ofs)!=_rv('data')) return 0;
+	//ofs+=8+*(DWORD*)(buf+ofs+4);
+	ofs+=8;
+	DWORD ss=*(DWORD*)(buf+ofs-4);
+	DWORD nc=*(DWORD*)(buf+ofs);
+	DWORD* ptr=(DWORD*)(buf+ofs);
+	grow_buf out;
+	ss>>=2;
+	DWORD mhdr[2];
+	mhdr[0]=_rv('MThd');
+	mhdr[1]=_rv(6);
+	WRITE(mhdr,8);
+	WORD w=0;
+	WRITE(&w,2);
+	w=0x100;
+	WRITE(&w,2);
+	w=rev16((WORD)fmt->dwTimeFormat);
+	WRITE(&w,2);
+	mhdr[0]=_rv('MTrk');
+	WRITE(mhdr,8);
+	DWORD tw=0,ct=0;
+	DWORD cc=0;
+	DWORD cs;
+	DWORD pos=1;
+	while(cc<nc)
+	{
+		cs = (ptr[pos+1]>>2)+pos;
+		if (cs>ss) break;
+		pos+=2;
+		while(pos<cs)
+		{
+			ct+=ptr[pos];
+			pos+=2;
+			DWORD e=ptr[pos];
+			if (e&MEVT_F_LONG)
+			{
+				pos+=e&0xFFFFFF;
+			}
+			else
+			{
+				if (e>>24==MEVT_TEMPO)
+				{
+					D_WRITE;
+					BYTE tmp[6]={0xFF,0x51,0x03,(BYTE)((e>>16)&0xFF),(BYTE)((e>>8)&0xFF),(BYTE)(e&0xFF)};
+					WRITE(tmp,6);
+				}
+				else if (!(e>>24))
+				{
+					BYTE c=(BYTE)(e&0xF0);
+					if (c!=0xF0)
+					{
+						D_WRITE;
+						DWORD l=(c==0xC0 || c==0xD0) ? 2 : 3;
+						WRITE(&e,l);
+					}
+				}
+				pos++;
+			}
+		}
+	}
+	WRITE("\x00\xFF\x2F",4);
+
+	out.write_dword_ptr(rev32(out.get_size()-(8+6+8)),8+6+4);
+
+	mf->size = out.get_size();
+	mf->data = (BYTE*)out.finish();
+	return !!mf->data;
+}
\ No newline at end of file
-- 
cgit