Skip to content
Snippets Groups Projects
Commit 56e19a28 authored by GovanifY's avatar GovanifY Committed by GitHub
Browse files

Figured I'd fix this since Xad linked it

parent ee2d51f4
Branches master
No related tags found
No related merge requests found
Hide whitespace changes
Inline Side-by-side
Showing
with 55 additions and 39 deletions
MIDI2BGM/Program.cs
+ 55
− 39
View file @ 56e19a28
/* This is a very early MIDI to BGM converter. There is still a lot unknown. */
//I remember having fucked up something here, but don't have the time to fix it for now.
/* This is a very early MIDI to BGM converter. There is still a lot unknown. */
using System;
using System.Collections.Generic;
using System.IO;
......@@ -16,19 +15,22 @@ public static void WriteBytes(byte[] i, BinaryWriter writer)
writer.Write(i);
}
public static void WriteDelta(int i, BinaryWriter writer)
public static void WriteDelta(float i, BinaryWriter writer)
{
if (i > 0xFFFFFFF)
{
throw new Exception("Delta is too long!");
}
//Welp, never know(?)
if ((i % 1) != 0) { i = (int)Math.Round((double)i, MidpointRounding.AwayFromZero); }
// Console.WriteLine("delta_rounded: {0}", i);
while (i > 0xFFFFFFF) { WriteDummy(0xFFFFFFF, writer); i -= 0xFFFFFFF; }
//Console.WriteLine("delta_rounded_2: {0}", i);
UInt32 b = ((UInt32)i & 0x7F);
while (Convert.ToBoolean(i >>= 7))
//Console.WriteLine("delta_rounded_3: {0}", b);
int tmp = (int)i;
while (Convert.ToBoolean(tmp >>= 7))
{
b <<= 8;
b |= ((uint)(i & 0x7F) | 0x80);
b |= (uint)((tmp & 0x7F) | 0x80);
}
// Console.WriteLine("delta_rounded_4: {0}", b);
do
{
writer.Write((byte)b);
......@@ -44,12 +46,11 @@ public static void WriteDummy(int i, BinaryWriter writer)
{
if (i == 0)
{
return;
}
WriteDelta(i, writer);
byte[] buffer1 = {
0xff, 6, 0
};
byte[] buffer1 = {0x5d, 0};
WriteBytes(buffer1, writer);
}
}
static void Main(string[] args)
......@@ -80,7 +81,7 @@ public static void GetBGM(string nme)
byte trackC;
ushort ppqn;
long ActualPos;
int delta;
float delta;
int deltaMod = 1;
FileStream midS = File.Open(nme, FileMode.Open, FileAccess.Read);
BinaryReader mid = new BinaryReader(midS);
......@@ -91,7 +92,7 @@ public static void GetBGM(string nme)
byte track = 0;
byte channel = 0;
byte[] command;
byte[] towrite;
byte[] towrite = new byte[0];
byte SubCommand;
long trackLenOffset;
UInt16 temp;
......@@ -198,14 +199,15 @@ public static void GetBGM(string nme)
for (ActualPos += midS.Position; midS.Position < ActualPos - 1;)
{
do
{
byte tmptbyte;
t = tmptbyte = mid.ReadByte();
delta = (delta << 7) + (tmptbyte & 0x7f);
} while ((t & 0x80) != 0);
delta = ((int)delta << 7) + (tmptbyte & 0x7f);
} while (Convert.ToBoolean(t & 0x80));
delta /= deltaMod;
//Console.WriteLine("delta: {0}", delta);
/*if(track>2){//skip track
midS.Position=tSzT;
......@@ -219,13 +221,12 @@ public static void GetBGM(string nme)
}*/
cmd = mid.ReadByte();
//Console.WriteLine("Current command: {0:x2}",cmd);
if (cmd == 0xFF)
{
command = new byte[] { mid.ReadByte(), mid.ReadByte() };
Console.WriteLine("Current command: {0:x2} {1:x2} {2:x2}", cmd, command[0], command[1]);
// Console.WriteLine("Current command: {0:x2} {1:x2} {2:x2}", cmd, command[0], command[1]);
switch (command[0])
{
case 0x2F:
......@@ -302,6 +303,7 @@ public static void GetBGM(string nme)
default:
midS.Position += command[1];
Console.WriteLine("Unknown command1: 0x{0:x2} 0x{1:x2}", cmd, command[0]);
towrite = new byte[0];
break;
}
......@@ -312,6 +314,7 @@ public static void GetBGM(string nme)
{
cmd = mid.ReadByte();
SubCommand = mid.ReadByte();
// Console.WriteLine("Current command: {0:x2} {1:x2}", cmd, SubCommand);
switch (cmd)
{
case 7:
......@@ -350,6 +353,7 @@ public static void GetBGM(string nme)
}
else
{
// Console.WriteLine("Current command: {0:x2}", cmd);
if ((cmd & 0xC0) == 0xC0)
{
WriteDelta(delta, bgm);
......@@ -373,7 +377,8 @@ public static void GetBGM(string nme)
}
else
{
towrite = new byte[] { 0x13, lVelocity = command[1] };
lVelocity = command[1];
towrite = new byte[] { 0x13, lVelocity };
WriteBytes(towrite, bgm);
}
}
......@@ -395,32 +400,43 @@ public static void GetBGM(string nme)
}
}
if ((cmd & 0x80) == 0x80)
else
{
command = new byte[] { mid.ReadByte(), mid.ReadByte() };
WriteDelta(delta, bgm);
delta = 0;
if (command[0] == lKey)
{
towrite = new byte[] { 0x18 };
WriteBytes(towrite, bgm);
}
else
if ((cmd & 0x80) == 0x80)
{
lKey = command[0];
towrite = new byte[] { 0x1A, lKey };
WriteBytes(towrite, bgm);
command = new byte[] { mid.ReadByte(), mid.ReadByte() };
WriteDelta(delta, bgm);
delta = 0;
//Console.WriteLine("wtf: {0:x2}, {1:x2}", command[0], lKey);
if (command[0] == lKey)
{
towrite = new byte[] { 0x18 };
WriteBytes(towrite, bgm);
}
else
{
lKey = command[0];
towrite = new byte[] { 0x1A, lKey };
WriteBytes(towrite, bgm);
}
}
}
else
{
Console.WriteLine("Unknown command3: 0x{0:x2}", cmd);
else { Console.WriteLine("Unknown command3: 0x{0:x2}", cmd); }
}
}
}
}
/* Console.Write("{0}: [ ", (bgm.BaseStream.Position - towrite.Length).ToString("X"));
int y = 0;
foreach (var item in towrite)
{
if (y > 0) { Console.Write(", "); }
Console.Write(item.ToString("X"));
y++;
}
Console.WriteLine("]");*/
}
if (midS.Position != ActualPos)
......
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment