mmus2mid.c

// Emacs style mode select   -*- C++ -*-
//-----------------------------------------------------------------------------
//
// DESCRIPTION:
//  This file supports conversion of MUS format music in memory
//  to MIDI format 1 music in memory.
//
//  The primary routine, mmus2mid, converts a block of memory in MUS format
//  to an Allegro MIDI structure. This supports playing MUS lumps in a wad
//  file with BOOM.
//
//  Another routine, Midi2MIDI, converts a block of memory in MIDI format 1 to
//  an Allegro MIDI structure. This supports playing MIDI lumps in a wad
//  file with BOOM.
//
//  For testing purposes, and to make a utility if desired, if the symbol
//  STANDALONE is defined by uncommenting the definition below, a main
//  routine is compiled that will convert a possibly wildcarded set of MUS
//  files to a similarly named set of MIDI files.
//
//  Much of the code here is thanks to S. Bacquet's source for QMUS2MID.C
//
//-----------------------------------------------------------------------------
static const char rcsid[] = "$Id: mmus2mid.c,v 1.1.1.1 2000-07-29 13:20:39 fraggle Exp $";

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <malloc.h>
#include <allegro.h>
#include "mmus2mid.h"

//#define STANDALONE  /* uncomment this to make MMUS2MID.EXE */
#ifndef STANDALONE
#include "z_zone.h"
#endif

// some macros to decode mus event bit fields

#define last(e)         ((UBYTE)((e) & 0x80))
#define event_type(e)   ((UBYTE)(((e) & 0x7F) >> 4))
#define channel(e)      ((UBYTE)((e) & 0x0F))

// event types

typedef enum
{
  RELEASE_NOTE,
  PLAY_NOTE,
  BEND_NOTE,
  SYS_EVENT,
  CNTL_CHANGE,
  UNKNOWN_EVENT1,
  SCORE_END,
  UNKNOWN_EVENT2,
} mus_event_t;

// MUS format header structure

typedef struct
{
  char        ID[4];            // identifier "MUS"0x1A
  UWORD       ScoreLength;      // length of music portion
  UWORD       ScoreStart;       // offset of music portion
  UWORD       channels;         // count of primary channels
  UWORD       SecChannels;      // count of secondary channels
  UWORD       InstrCnt;         // number of instruments
} MUSheader;

// to keep track of information in a MIDI track

typedef struct Track
{
  char  velocity;
  long  deltaT;
  UBYTE lastEvt;
  long  alloced;
} TrackInfo;

// array of info about tracks

static TrackInfo track[MIDI_TRACKS];

// initial track size allocation
#define TRACKBUFFERSIZE 1024

// lookup table MUS -> MID controls
static UBYTE MUS2MIDcontrol[15] =
{
  0,         // Program change - not a MIDI control change
  0x00,      // Bank select
  0x01,      // Modulation pot
  0x07,      // Volume
  0x0A,      // Pan pot
  0x0B,      // Expression pot
  0x5B,      // Reverb depth
  0x5D,      // Chorus depth
  0x40,      // Sustain pedal
  0x43,      // Soft pedal
  0x78,      // All sounds off
  0x7B,      // All notes off
  0x7E,      // Mono
  0x7F,      // Poly
  0x79       // Reset all controllers
};

// some strings of bytes used in the midi format

static UBYTE midikey[]   =
{0x00,0xff,0x59,0x02,0x00,0x00};        // C major
static UBYTE miditempo[] =
{0x00,0xff,0x51,0x03,0x09,0xa3,0x1a};   // uS/qnote
static UBYTE midihdr[]   =
{'M','T','h','d',0,0,0,6,0,1,0,0,0,0};  // header (length 6, format 1)
static UBYTE trackhdr[]  =
{'M','T','r','k'};                      // track header

// static routine prototypes

static int TWriteByte(MIDI *mididata, int MIDItrack, UBYTE byte);
static int TWriteVarLen(MIDI *mididata, int MIDItrack, register ULONG value);
static ULONG ReadTime(UBYTE **musptrp);
static int FirstChannelAvailable(int MUS2MIDchannel[]);
static UBYTE MidiEvent(MIDI *mididata,UBYTE midicode,UBYTE MIDIchannel,
                       UBYTE MIDItrack,int nocomp);

//
// TWriteByte()
//
// write one byte to the selected MIDItrack, update current position
// if track allocation exceeded, double it
// if track not allocated, initially allocate TRACKBUFFERSIZE bytes
//
// Passed pointer to Allegro MIDI structure, number of the MIDI track being
// written, and the byte to write.
//
// Returns 0 on success, MEMALLOC if a memory allocation error occurs
//
static int TWriteByte(MIDI *mididata, int MIDItrack, UBYTE byte)
{
  ULONG pos ;

  pos = mididata->track[MIDItrack].len;
  if (pos >= track[MIDItrack].alloced)
    {
      track[MIDItrack].alloced =        // double allocation
        track[MIDItrack].alloced?       // or set initial TRACKBUFFERSIZE
        2*track[MIDItrack].alloced :
        TRACKBUFFERSIZE;

      if (!(mididata->track[MIDItrack].data =     // attempt to reallocate
            realloc(mididata->track[MIDItrack].data,
                    track[MIDItrack].alloced)))
        return MEMALLOC;
    }
  mididata->track[MIDItrack].data[pos] = byte;
  mididata->track[MIDItrack].len++;
  return 0;
}

//
// TWriteVarLen()
//
// write the ULONG value to tracknum-th track, in midi format, which is
// big endian, 7 bits per byte, with all bytes but the last flagged by
// bit 8 being set, allowing the length to vary.
//
// Passed the Allegro MIDI structure, the track number to write,
// and the ULONG value to encode in midi format there
//
// Returns 0 if sucessful, MEMALLOC if a memory allocation error occurs
//
static int TWriteVarLen(MIDI *mididata, int tracknum, register ULONG value)
{
  register ULONG buffer;

  buffer = value & 0x7f;
  while ((value >>= 7))         // terminates because value unsigned
    {
      buffer <<= 8;               // note first value shifted in has bit 8 clear
      buffer |= 0x80;             // all succeeding values do not
      buffer += (value & 0x7f);
    }
  while (1)                     // write bytes out in opposite order
    {
      if (TWriteByte(mididata, tracknum, buffer&0xff)) // insure buffer masked
        return MEMALLOC;

      if (buffer & 0x80)
        buffer >>= 8;
      else                        // terminate on the byte with bit 8 clear
        break;
    }
  return 0;
}

//
// ReadTime()
//
// Read a time value from the MUS buffer, advancing the position in it
//
// A time value is a variable length sequence of 8 bit bytes, with all
// but the last having bit 8 set.
//
// Passed a pointer to the pointer to the MUS buffer
// Returns the integer unsigned long time value there and advances the pointer
//
static ULONG ReadTime(UBYTE **musptrp)
{
  register ULONG timeval = 0;
  int byte;

  do    // shift each byte read up in the result until a byte with bit 8 clear
    {
      byte = *(*musptrp)++;
      timeval = (timeval << 7) + (byte & 0x7F);
    }
  while(byte & 0x80);

  return timeval;
}

//
// FirstChannelAvailable()
//
// Return the next unassigned MIDI channel number
//
// The assignment for MUS channel 15 is not counted in the caculation, that
// being percussion and always assigned to MIDI channel 9 (base 0).
//
// Passed the array of MIDI channels assigned to MUS channels
// Returns the maximum channel number unassigned unless that is 9 in which
// case 10 is returned.
//
// killough 10/7/98: changed char parameter, return values to int

static int FirstChannelAvailable(int MUS2MIDchannel[])
{
  int i ;
  int max = -1 ;

  // find the largest MIDI channel assigned so far
  for (i = 0; i < 15; i++)
    if (MUS2MIDchannel[i] > max)
      max = MUS2MIDchannel[i];

  return (max == 8 ? 10 : max+1); // skip MIDI channel 9 (percussion)
}

//
// MidiEvent()
//
// Constructs a MIDI event code, and writes it to the current MIDI track
// unless its the same as the last event code and compressio is enabled
// in which case nothing is written.
//
// Passed the Allegro MIDI structure, the midi event code, the current
// MIDI channel number, the current MIDI track number, and whether compression
// (running status) is enabled.
//
// Returns the new event code if successful, 0 if a memory allocation error
//
static UBYTE MidiEvent(MIDI *mididata,UBYTE midicode,UBYTE MIDIchannel,
                       UBYTE MIDItrack,int nocomp)
{
  UBYTE newevent;

  newevent = midicode | MIDIchannel;
  if ((newevent != track[MIDItrack].lastEvt) || nocomp)
    {
      if (TWriteByte(mididata,MIDItrack, newevent))
        return 0;                                    // indicates MEMALLOC error
      track[MIDItrack].lastEvt = newevent;
    }
  return newevent;
}

//
// mmus2mid()
//
// Convert a memory buffer contain MUS data to an Allegro MIDI structure
// with specified time division and compression.
//
// Passed a pointer to the buffer containing MUS data, a pointer to the
// Allegro MIDI structure, the divisions, and a flag whether to compress.
//
// Returns 0 if successful, otherwise an error code (see mmus2mid.h).
//
int mmus2mid(UBYTE *mus, MIDI *mididata, UWORD division, int nocomp)
{
  UWORD TrackCnt = 0;
  UBYTE evt, MUSchannel, MIDIchannel, MIDItrack=0, NewEvent;
  int i, event, data;
  UBYTE *musptr;
  size_t muslen;
  static MUSheader MUSh;
  UBYTE MIDIchan2track[MIDI_TRACKS];  // killough 10/7/98: fix too small array
  int MUS2MIDchannel[MIDI_TRACKS];    // killough 10/7/98: fix too small array

  // copy the MUS header from the MUS buffer to the MUSh header structure

  memcpy(&MUSh,mus,sizeof(MUSheader));

  // check some things and set length of MUS buffer from internal data

  if (!(muslen = MUSh.ScoreLength + MUSh.ScoreStart))
    return MUSDATAMT;     // MUS file empty

  if (MUSh.channels > 15)       // MUSchannels + drum channel > 16
    return TOOMCHAN ;

  musptr = mus+MUSh.ScoreStart; // init musptr to start of score

  for (i = 0; i < MIDI_TRACKS; i++)   // init the track structure's tracks
    {
      MUS2MIDchannel[i] = -1;       // flag for channel not used yet
      track[i].velocity = 64;
      track[i].deltaT = 0;
      track[i].lastEvt = 0;
      free(mididata->track[i].data);//jff 3/5/98 remove old allocations
      mididata->track[i].data=NULL;
      track[i].alloced = 0;
      mididata->track[i].len = 0;
    }

  if (!division)
    division = 70;

  // allocate the first track which is a special tempo/key track
  // note multiple tracks means midi format 1

  // set the divisions (ticks per quarter note)
  mididata->divisions = division;

  // allocate for midi tempo/key track, allow for end of track
  if (!(mididata->track[0].data =
        realloc(mididata->track[0].data,sizeof(midikey)+sizeof(miditempo)+4)))
    return MEMALLOC;

  // key C major
  memcpy(mididata->track[0].data,midikey,sizeof(midikey));
  // tempo uS/qnote
  memcpy(mididata->track[0].data+sizeof(midikey),miditempo,sizeof(miditempo));
  mididata->track[0].len = sizeof(midikey)+sizeof(miditempo);

  TrackCnt++;   // music tracks start at 1

  // process the MUS events in the MUS buffer

  do
    {
      // get a mus event, decode its type and channel fields

      event = *musptr++;
      if ((evt = event_type(event)) == SCORE_END) //jff 1/23/98 use symbol
        break;  // if end of score event, leave
      MUSchannel = channel(event);

      // if this channel not initialized, do so

      if (MUS2MIDchannel[MUSchannel] == -1)
        {
          // set MIDIchannel and MIDItrack

          MIDIchannel = MUS2MIDchannel[MUSchannel] =
            (MUSchannel == 15 ? 9 : FirstChannelAvailable(MUS2MIDchannel));
          MIDItrack = MIDIchan2track[MIDIchannel] = TrackCnt++;
        }
      else // channel already allocated as a track, use those values
        {
          MIDIchannel = MUS2MIDchannel[MUSchannel];
          MIDItrack   = MIDIchan2track[MIDIchannel];
        }

      if (TWriteVarLen(mididata, MIDItrack, track[MIDItrack].deltaT))
        return MEMALLOC;
      track[MIDItrack].deltaT = 0;

      switch(evt)
        {
        case RELEASE_NOTE:
	  // killough 10/7/98: Fix noise problems by not allowing compression
          if (!(NewEvent=MidiEvent(mididata,0x90,MIDIchannel,MIDItrack,1)))
            return MEMALLOC;

          data = *musptr++;
          if (TWriteByte(mididata, MIDItrack, data & 0x7F))
            return MEMALLOC;
          if (TWriteByte(mididata, MIDItrack, 0))
            return MEMALLOC;
          break;

        case PLAY_NOTE:
          if (!(NewEvent=MidiEvent(mididata,0x90,MIDIchannel,MIDItrack,nocomp)))
            return MEMALLOC;

          data = *musptr++;
          if (TWriteByte(mididata, MIDItrack, data & 0x7F))
            return MEMALLOC;
          if( data & 0x80 )
            track[MIDItrack].velocity = (*musptr++) & 0x7f;
          if (TWriteByte(mididata, MIDItrack, track[MIDItrack].velocity))
            return MEMALLOC;
          break;

        case BEND_NOTE:
          if (!(NewEvent=MidiEvent(mididata,0xE0,MIDIchannel,MIDItrack,nocomp)))
            return MEMALLOC;

          data = *musptr++;
          if (TWriteByte(mididata, MIDItrack, (data & 1) << 6))
            return MEMALLOC;
          if (TWriteByte(mididata, MIDItrack, data >> 1))
            return MEMALLOC;
          break;

        case SYS_EVENT:
          if (!(NewEvent=MidiEvent(mididata,0xB0,MIDIchannel,MIDItrack,nocomp)))
            return MEMALLOC;

          data = *musptr++;
          if (data<10 || data>14)
            return BADSYSEVT;

          if (TWriteByte(mididata, MIDItrack, MUS2MIDcontrol[data]))
            return MEMALLOC;
          if (data == 12)
            {
              if (TWriteByte(mididata, MIDItrack, MUSh.channels+1))
                return MEMALLOC;
            }
          else 
	    if (TWriteByte(mididata, MIDItrack, 0))
	      return MEMALLOC;
          break;

        case CNTL_CHANGE:
          data = *musptr++;
          if (data>9)
            return BADCTLCHG;

          if (data)
            {
              if (!(NewEvent=MidiEvent(mididata,0xB0,MIDIchannel,MIDItrack,nocomp)))
                return MEMALLOC;

              if (TWriteByte(mididata, MIDItrack, MUS2MIDcontrol[data]))
                return MEMALLOC;
            }
          else
            {
              if (!(NewEvent=MidiEvent(mididata,0xC0,MIDIchannel,MIDItrack,nocomp)))
                return MEMALLOC;
            }
          data = *musptr++;
          if (TWriteByte(mididata, MIDItrack, data & 0x7F))
            return MEMALLOC;
          break;

        case UNKNOWN_EVENT1:   // mus events 5 and 7
        case UNKNOWN_EVENT2:   // meaning not known
          return BADMUSCTL;

        case SCORE_END:
          break;

        default:
          return BADMUSCTL;   // exit with error
        }
      if (last(event))
        {
          ULONG DeltaTime = ReadTime(&musptr); // killough 10/7/98: make local
	  for (i = 0;i < MIDI_TRACKS; i++) //jff 3/13/98 update all tracks
	    track[i].deltaT += DeltaTime;  //whether allocated yet or not
        }
    } 
  while ((evt != SCORE_END) && musptr-mus < muslen);

  if (evt!=SCORE_END)
    return MUSDATACOR;

  // Now add an end of track to each mididata track, correct allocation

  for (i = 0; i < MIDI_TRACKS; i++)
    if (mididata->track[i].len)
      {       // killough 10/7/98: simplify code
	if (TWriteByte(mididata, i, 0x00) || // midi end of track code
	    TWriteByte(mididata, i, 0xFF) ||
	    TWriteByte(mididata, i, 0x2F) ||
	    TWriteByte(mididata, i, 0x00))
	  return MEMALLOC;

	// jff 1/23/98 fix failure to set data NULL, len 0 for unused tracks
	// shorten allocation to proper length (important for Allegro)

	if (!(mididata->track[i].data =
	      realloc(mididata->track[i].data,mididata->track[i].len)))
	  return MEMALLOC;
      }
    else
      {
	free(mididata->track[i].data);
	mididata->track[i].data = NULL;
      }

  return 0;
}

//
// ReadLength()
//
// Reads the length of a chunk in a midi buffer, advancing the pointer
// 4 bytes, bigendian
//
// Passed a pointer to the pointer to a MIDI buffer
// Returns the chunk length at the pointer position
//
size_t ReadLength(UBYTE **mid)
{
  UBYTE *midptr = *mid;

  size_t length = (*midptr++)<<24;
  length += (*midptr++)<<16;
  length += (*midptr++)<<8;
  length += *midptr++;
  *mid = midptr;
  return length;
}

//
// MidiToMIDI()
//
// Convert an in-memory copy of a MIDI format 0 or 1 file to
// an Allegro MIDI structure, that is valid or has been zeroed
//
// Passed a pointer to a memory buffer with MIDI format music in it and a
// pointer to an Allegro MIDI structure.
//
// Returns 0 if successful, BADMIDHDR if the buffer is not MIDI format
//
int MidiToMIDI(UBYTE *mid,MIDI *mididata)
{
  int i;
  int ntracks;

  // read the midi header

  if (memcmp(mid,midihdr,4))
    return BADMIDHDR;

  mididata->divisions = (mid[12]<<8)+mid[13];
  ntracks = (mid[10]<<8)+mid[11];

  if (ntracks>=MIDI_TRACKS)
    return BADMIDHDR;

  mid += 4;

  {  // killough 10/7/98: fix mid from being modified twice before sequence pt.
    size_t t = ReadLength(&mid);            // seek past header
    mid += t;
  }

  // now read each track

  for (i=0;i<ntracks;i++)
    {
      while (memcmp(mid,trackhdr,4))    // simply skip non-track data
        {
          mid += 4;
	  {
	    size_t t = ReadLength(&mid);            // seek past header
	    mid += t;  // killough 10/7/98: prevent mid undefined behavior
	  }
        }
      mid += 4;
      mididata->track[i].len = ReadLength(&mid);  // get length, move mid past it

      // read a track
      mididata->track[i].data = realloc(mididata->track[i].data,mididata->track[i].len);
      memcpy(mididata->track[i].data,mid,mididata->track[i].len);
      mid += mididata->track[i].len;
    }
  for (;i<MIDI_TRACKS;i++)
    if (mididata->track[i].len)
      {
        free(mididata->track[i].data);
        mididata->track[i].data = NULL;
        mididata->track[i].len = 0;
      }
  return 0;
}

#ifdef STANDALONE /* this code unused by BOOM provided for future portability */
/* it also provides a MUS to MID file converter*/

static void FreeTracks(MIDI *mididata);
static void TWriteLength(UBYTE **midiptr,ULONG length);

//
// FreeTracks()
//
// Free all track allocations in the MIDI structure
//
// Passed a pointer to an Allegro MIDI structure
// Returns nothing
//
static void FreeTracks(MIDI *mididata)
{
  int i;

  for (i=0; i<MIDI_TRACKS; i++)
    {
      free(mididata->track[i].data);
      mididata->track[i].data = NULL;
      mididata->track[i].len = 0;
    }
}

//
// TWriteLength()
//
// Write the length of a MIDI chunk to a midi buffer. The length is four
// bytes and is written byte-reversed for bigendian. The pointer to the
// midi buffer is advanced.
//
// Passed a pointer to the pointer to a midi buffer, and the length to write
// Returns nothing
//
static void TWriteLength(UBYTE **midiptr,ULONG length)
{
  *(*midiptr)++ = (length>>24)&0xff;
  *(*midiptr)++ = (length>>16)&0xff;
  *(*midiptr)++ = (length>>8)&0xff;
  *(*midiptr)++ = (length)&0xff;
}

//
// MIDIToMidi()
//
// This routine converts a midi 1 format file in memory to a MIDI structure
// that Allegro can play. It is used to support native midi lumps in BOOM.
//
// Passed a pointer to an Allegro MIDI structure, a pointer to a pointer to
// a buffer containing midi data, and a pointer to a length return.
// Returns 0 if successful, MEMALLOC if a memory allocation error occurs
//
int MIDIToMidi(MIDI *mididata,UBYTE **mid,int *midlen)
{
  size_t total;
  int i,ntrks;
  UBYTE *midiptr;

  // calculate how long the mid buffer must be, and allocate

  total = sizeof(midihdr);
  for (i=0,ntrks=0;i<MIDI_TRACKS;i++)
    if (mididata->track[i].len)
      {
        total += 8 + mididata->track[i].len; // Track hdr + track length
        ntrks++;
      }
  if ((*mid = malloc(total))==NULL)
    return MEMALLOC;


  // fill in number of tracks and bigendian divisions (ticks/qnote)

  midihdr[10] = 0;
  midihdr[11] = (UBYTE)ntrks;   // set number of tracks in header
  midihdr[12] = (mididata->divisions>>8) & 0x7f;
  midihdr[13] = (mididata->divisions) & 0xff;

  // write the midi header

  midiptr = *mid;
  memcpy(midiptr,midihdr,sizeof(midihdr));
  midiptr += sizeof(midihdr);

  // write the tracks

  for (i=0;i<MIDI_TRACKS;i++)
    {
      if (mididata->track[i].len)
        {
          memcpy(midiptr,trackhdr,sizeof(trackhdr));    // header
          midiptr += sizeof(trackhdr);
          TWriteLength(&midiptr,mididata->track[i].len);  // track length
          // data
          memcpy(midiptr,mididata->track[i].data,mididata->track[i].len);
          midiptr += mididata->track[i].len;
        }
    }

  // return length information

  *midlen = midiptr - *mid;

  return 0;
}

//
// main()
//
// Main routine that will convert a globbed set of MUS files to the
// correspondingly named MID files using mmus2mid(). Only compiled
// if the STANDALONE symbol is defined.
//
// Passed the command line arguments, returns 0 if successful
//
int main(int argc,char **argv)
{
  FILE *musst,*midst;
  char musfile[FILENAME_MAX],midfile[FILENAME_MAX];
  MUSheader MUSh;
  UBYTE *mus,*mid;
  static MIDI mididata;
  int err,midlen;
  char *p,*q;
  int i;

  if (argc<2)
    {
      printf("Usage: MMUS2MID musfile[.MUS]\n");
      printf("writes musfile.MID as output\n");
      printf("musfile may contain wildcards\n");
      exit(1);
    }

  for (i=1;i<argc;i++)
    {
      strcpy(musfile,argv[i]);
      p = strrchr(musfile,'.');
      q = strrchr(musfile,'\\');
      if (p && (!q || q<p)) *p='\0';
      strcpy(midfile,musfile);
      strcat(musfile,".MUS");
      strcat(midfile,".MID");

      musst = fopen(musfile,"rb");
      if (musst)
        {
          fread(&MUSh,sizeof(MUSheader),1,musst);
          mus = malloc(MUSh.ScoreLength+MUSh.ScoreStart);
          if (mus)
            {
              fseek(musst,0,SEEK_SET);
              if (!fread(mus,MUSh.ScoreLength+MUSh.ScoreStart,1,musst))
                {
                  printf("Error reading MUS file\n");
                  free(mus);
                  exit(1);
                }
              fclose(musst);
            }
          else
            {
              printf("Out of memory\n");
              exit(1);
            }

          err = mmus2mid(mus,&mididata,89,1);
          if (err)
            {
              printf("Error converting MUS file to MIDI: %d\n",err);
              exit(1);
            }
          free(mus);

          MIDIToMidi(&mididata,&mid,&midlen);

          midst = fopen(midfile,"wb");
          if (midst)
            {
              if (!fwrite(mid,midlen,1,midst))
                {
                  printf("Error writing MIDI file\n");
                  FreeTracks(&mididata);
                  free(mid);
                  exit(1);
                }
              fclose(midst);
            }
          else
            {
              printf("Can't open MIDI file for output: %s\n", midfile);
              FreeTracks(&mididata);
              free(mid);
              exit(1);
            }
        }
      else
        {
          printf("Can't open MUS file for input: %s\n", midfile);
          exit(1);
        }

      printf("MUS file %s converted to MIDI file %s\n",musfile,midfile);
      FreeTracks(&mididata);
      free(mid);
    }
  exit(0);
}

#endif
//----------------------------------------------------------------------------
//
// $Log: mmus2mid.c,v $
// Revision 1.1.1.1  2000-07-29 13:20:39  fraggle
// imported sources
//
// Revision 1.10  1998/05/10  23:00:43  jim
// formatted/documented mmus2mid
//
// Revision 1.9  1998/03/14  17:16:19  jim
// Fixed track timing problem
//
// Revision 1.8  1998/03/05  16:59:55  jim
// Fixed minor error in mus to midi conversion
//
// Revision 1.7  1998/02/08  15:15:47  jim
// Added native midi support
//
// Revision 1.6  1998/01/26  19:23:54  phares
// First rev with no ^Ms
//
// Revision 1.5  1998/01/23  20:26:20  jim
// Fix bug causing leftover tracks to persist
//
// Revision 1.4  1998/01/21  17:41:13  rand
// Added rcsid string back that Jim took out.
//
// Revision 1.3  1998/01/21  16:56:20  jim
// Music fixed, defaults for cards added
//
// Revision 1.2  1998/01/19  23:36:15  rand
// Added rcsid and Id: strings at top of file
//
// Revision 1.1.1.1  1998/01/19  14:03:10  rand
// Lee's Jan 19 sources
//
//----------------------------------------------------------------------------