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309 lines
6.9 KiB
C++
309 lines
6.9 KiB
C++
/*
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** mus2midi.cpp
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** Simple converter from MUS to MIDI format
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**
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**---------------------------------------------------------------------------
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** Copyright 1998-2006 Randy Heit
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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** MUS files are essentially format 0 MIDI files with some
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** space-saving modifications. Conversion is quite straight-forward.
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** If you were to hook a main() into this that calls ProduceMIDI,
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** you could create a self-contained MUS->MIDI converter.
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*/
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#include <string.h>
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#include "m_swap.h"
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#include "mus2midi.h"
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#include "doomdef.h"
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static const BYTE StaticMIDIhead[] =
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{ 'M','T','h','d', 0, 0, 0, 6,
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0, 0, // format 0: only one track
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0, 1, // yes, there is really only one track
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0, 70, // 70 divisions
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'M','T','r','k', 0, 0, 0, 0,
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// The first event sets the tempo to 500,000 microsec/quarter note
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0, 255, 81, 3, 0x07, 0xa1, 0x20
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};
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extern int MUSHeaderSearch(const BYTE *head, int len);
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static const BYTE CtrlTranslate[15] =
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{
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0, // program change
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0, // bank select
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1, // modulation pot
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7, // volume
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10, // pan pot
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11, // expression pot
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91, // reverb depth
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93, // chorus depth
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64, // sustain pedal
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67, // soft pedal
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120, // all sounds off
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123, // all notes off
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126, // mono
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127, // poly
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121, // reset all controllers
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};
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static size_t ReadVarLen (const BYTE *buf, int *time_out)
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{
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int time = 0;
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size_t ofs = 0;
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BYTE t;
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do
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{
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t = buf[ofs++];
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time = (time << 7) | (t & 127);
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} while (t & 128);
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*time_out = time;
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return ofs;
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}
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static size_t WriteVarLen (TArray<BYTE> &file, int time)
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{
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long buffer;
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size_t ofs;
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buffer = time & 0x7f;
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while ((time >>= 7) > 0)
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{
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buffer = (buffer << 8) | 0x80 | (time & 0x7f);
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}
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for (ofs = 0;;)
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{
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file.Push(BYTE(buffer & 0xff));
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if (buffer & 0x80)
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buffer >>= 8;
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else
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break;
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}
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return ofs;
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}
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bool ProduceMIDI (const BYTE *musBuf, int len, TArray<BYTE> &outFile)
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{
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BYTE midStatus, midArgs, mid1, mid2;
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size_t mus_p, maxmus_p;
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BYTE event;
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int deltaTime;
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const MUSHeader *musHead;
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BYTE status;
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BYTE chanUsed[16];
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BYTE lastVel[16];
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long trackLen;
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bool no_op;
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// Find the header
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int offset = MUSHeaderSearch(musBuf, len);
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if (offset < 0 || offset + (int)sizeof(MUSHeader) >= len)
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return false;
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musBuf += offset;
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len -= offset;
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musHead = (const MUSHeader *)musBuf;
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// Do some validation of the MUS file
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if (LittleShort(musHead->NumChans) > 15)
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return false;
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// Prep for conversion
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outFile.Clear();
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outFile.Reserve(sizeof(StaticMIDIhead));
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memcpy(&outFile[0], StaticMIDIhead, sizeof(StaticMIDIhead));
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musBuf += LittleShort(musHead->SongStart);
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mus_p = 0;
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maxmus_p = LittleShort(musHead->SongLen);
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if ((size_t)len - LittleShort(musHead->SongStart) < maxmus_p)
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{
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maxmus_p = len - LittleShort(musHead->SongStart);
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}
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memset (lastVel, 100, 16);
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memset (chanUsed, 0, 16);
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event = 0;
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deltaTime = 0;
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status = 0;
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while (mus_p < maxmus_p && (event & 0x70) != MUS_SCOREEND)
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{
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int channel;
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BYTE t = 0;
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event = musBuf[mus_p++];
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if ((event & 0x70) != MUS_SCOREEND)
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{
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t = musBuf[mus_p++];
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}
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channel = event & 15;
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if (channel == 15)
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{
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channel = 9;
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}
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else if (channel >= 9)
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{
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channel++;
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}
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if (!chanUsed[channel])
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{
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// This is the first time this channel has been used,
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// so sets its volume to 127.
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chanUsed[channel] = 1;
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outFile.Push(0);
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outFile.Push(0xB0 | channel);
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outFile.Push(7);
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outFile.Push(127);
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}
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midStatus = channel;
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midArgs = 0; // Most events have two args (0 means 2, 1 means 1)
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no_op = false;
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switch (event & 0x70)
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{
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case MUS_NOTEOFF:
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midStatus |= MIDI_NOTEON;
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mid1 = t & 127;
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mid2 = 0;
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break;
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case MUS_NOTEON:
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midStatus |= MIDI_NOTEON;
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mid1 = t & 127;
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if (t & 128)
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{
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lastVel[channel] = musBuf[mus_p++] & 127;
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}
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mid2 = lastVel[channel];
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break;
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case MUS_PITCHBEND:
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midStatus |= MIDI_PITCHBEND;
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mid1 = (t & 1) << 6;
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mid2 = (t >> 1) & 127;
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break;
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case MUS_SYSEVENT:
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if (t < 10 || t > 14)
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{
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no_op = true;
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}
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else
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{
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midStatus |= MIDI_CTRLCHANGE;
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mid1 = CtrlTranslate[t];
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mid2 = t == 12 /* Mono */ ? LittleShort(musHead->NumChans) : 0;
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}
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break;
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case MUS_CTRLCHANGE:
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if (t == 0)
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{ // program change
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midArgs = 1;
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midStatus |= MIDI_PRGMCHANGE;
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mid1 = musBuf[mus_p++] & 127;
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mid2 = 0; // Assign mid2 just to make GCC happy
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}
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else if (t > 0 && t < 10)
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{
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midStatus |= MIDI_CTRLCHANGE;
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mid1 = CtrlTranslate[t];
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mid2 = musBuf[mus_p++];
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}
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else
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{
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no_op = true;
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}
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break;
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case MUS_SCOREEND:
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midStatus = MIDI_META;
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mid1 = MIDI_META_EOT;
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mid2 = 0;
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break;
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default:
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return false;
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}
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if (no_op)
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{
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// A system-specific event with no data is a no-op.
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midStatus = MIDI_META;
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mid1 = MIDI_META_SSPEC;
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mid2 = 0;
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}
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WriteVarLen (outFile, deltaTime);
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if (midStatus != status)
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{
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status = midStatus;
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outFile.Push(status);
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}
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outFile.Push(mid1);
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if (midArgs == 0)
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{
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outFile.Push(mid2);
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}
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if (event & 128)
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{
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mus_p += ReadVarLen (&musBuf[mus_p], &deltaTime);
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}
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else
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{
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deltaTime = 0;
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}
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}
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// fill in track length
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trackLen = outFile.Size() - 22;
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outFile[18] = BYTE((trackLen >> 24) & 255);
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outFile[19] = BYTE((trackLen >> 16) & 255);
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outFile[20] = BYTE((trackLen >> 8) & 255);
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outFile[21] = BYTE(trackLen & 255);
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return true;
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}
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bool ProduceMIDI(const BYTE *musBuf, int len, FILE *outFile)
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{
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TArray<BYTE> work;
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if (ProduceMIDI(musBuf, len, work))
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{
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return fwrite(&work[0], 1, work.Size(), outFile) == work.Size();
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}
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return false;
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}
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