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diff --git a/src/mmus2mid.h b/src/mmus2mid.h
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+/* Emacs style mode select   -*- C++ -*-
+ *-----------------------------------------------------------------------------
+ *
+ *
+ *  PrBoom: a Doom port merged with LxDoom and LSDLDoom
+ *  based on BOOM, a modified and improved DOOM engine
+ *  Copyright (C) 1999 by
+ *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
+ *  Copyright (C) 1999-2000 by
+ *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
+ *  Copyright 2005, 2006 by
+ *  Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
+ *
+ *  This program 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 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program 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 this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ *  02111-1307, USA.
+ *
+ * DESCRIPTION:
+ *  mmus2mid.c supports conversion of MUS format music in memory
+ *  to MIDI format 1 music in memory.
+ */
+
+#if !defined( MMUS2MID_H )
+#define MMUS2MID_H
+
+// error codes
+
+typedef enum
+{
+  MUSDATACOR,    // MUS data corrupt
+  TOOMCHAN,      // Too many channels
+  MEMALLOC,      // Memory allocation error
+  MUSDATAMT,     // MUS file empty
+  BADMUSCTL,     // MUS event 5 or 7 found
+  BADSYSEVT,     // MUS system event not in 10-14 range
+  BADCTLCHG,     // MUS control change larger than 9
+  TRACKOVF,      // MIDI track exceeds allocation
+  BADMIDHDR,     // bad midi header detected
+} error_code_t;
+
+// some names for integers of various sizes, all unsigned
+typedef unsigned char UBYTE;  // a one-byte int
+typedef unsigned short UWORD; // a two-byte int
+// proff: changed from unsigned int to unsigned long to avoid warning
+typedef unsigned long ULONG;   // a four-byte int (assumes int 4 bytes)
+
+#ifndef MSDOS /* proff: This is from allegro.h */
+#define MIDI_TRACKS           32
+
+typedef struct MIDI                    /* a midi file */
+{
+   int divisions;                      /* number of ticks per quarter note */
+   struct {
+      unsigned char *data;             /* MIDI message stream */
+      int len;                         /* length of the track data */
+   } track[MIDI_TRACKS];
+} MIDI;
+#endif /* !MSDOS */
+
+extern int mmus2mid(const UBYTE *mus,MIDI *mid, UWORD division, int nocomp);
+extern void free_mididata(MIDI *mid);
+extern int MIDIToMidi(MIDI *mididata,UBYTE **mid,int *midlen);
+extern int MidiToMIDI(UBYTE *mid,MIDI *mididata);
+
+#endif