ref: 50492913a5bc5186c79471e14e85ce513c271204
dir: /Game/src/audiolib/_midi.h/
/*
Copyright (C) 1994-1995 Apogee Software, Ltd.
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.
*/
/**********************************************************************
module: _MIDI.H
author: James R. Dose
date: May 25, 1994
Private header for MIDI.C. Midi song file playback routines.
(c) Copyright 1994 James R. Dose. All Rights Reserved.
**********************************************************************/
#ifndef ___MIDI_H
#define ___MIDI_H
#define RELATIVE_BEAT( measure, beat, tick ) \
( ( tick ) + ( ( beat ) << 9 ) + ( ( measure ) << 16 ) )
//Bobby Prince thinks this may be 100
//#define GENMIDI_DefaultVolume 100
#define GENMIDI_DefaultVolume 90
#define MAX_FORMAT 1
#define NUM_MIDI_CHANNELS 16
#define TIME_PRECISION 16
#define MIDI_HEADER_SIGNATURE 0x6468544d // "MThd"
#define MIDI_TRACK_SIGNATURE 0x6b72544d // "MTrk"
#define MIDI_VOLUME 7
#define MIDI_PAN 10
#define MIDI_DETUNE 94
#define MIDI_RHYTHM_CHANNEL 9
#define MIDI_RPN_MSB 100
#define MIDI_RPN_LSB 101
#define MIDI_DATAENTRY_MSB 6
#define MIDI_DATAENTRY_LSB 38
#define MIDI_PITCHBEND_MSB 0
#define MIDI_PITCHBEND_LSB 0
#define MIDI_RUNNING_STATUS 0x80
#define MIDI_NOTE_OFF 0x8
#define MIDI_NOTE_ON 0x9
#define MIDI_POLY_AFTER_TCH 0xA
#define MIDI_CONTROL_CHANGE 0xB
#define MIDI_PROGRAM_CHANGE 0xC
#define MIDI_AFTER_TOUCH 0xD
#define MIDI_PITCH_BEND 0xE
#define MIDI_SPECIAL 0xF
#define MIDI_SYSEX 0xF0
#define MIDI_SYSEX_CONTINUE 0xF7
#define MIDI_META_EVENT 0xFF
#define MIDI_END_OF_TRACK 0x2F
#define MIDI_TEMPO_CHANGE 0x51
#define MIDI_TIME_SIGNATURE 0x58
#define MIDI_RESET_ALL_CONTROLLERS 0x79
#define MIDI_ALL_NOTES_OFF 0x7b
#define MIDI_MONO_MODE_ON 0x7E
#define MIDI_SYSTEM_RESET 0xFF
#define GET_NEXT_EVENT( track, data ) \
( data ) = *( track )->pos; \
( track )->pos += 1
#define GET_MIDI_CHANNEL( event ) ( ( event ) & 0xf )
#define GET_MIDI_COMMAND( event ) ( ( event ) >> 4 )
#define EMIDI_INFINITE -1
#define EMIDI_END_LOOP_VALUE 127
#define EMIDI_ALL_CARDS 127
#define EMIDI_INCLUDE_TRACK 110
#define EMIDI_EXCLUDE_TRACK 111
#define EMIDI_PROGRAM_CHANGE 112
#define EMIDI_VOLUME_CHANGE 113
#define EMIDI_CONTEXT_START 114
#define EMIDI_CONTEXT_END 115
#define EMIDI_LOOP_START 116
#define EMIDI_LOOP_END 117
#define EMIDI_SONG_LOOP_START 118
#define EMIDI_SONG_LOOP_END 119
#define EMIDI_GeneralMIDI 0
#define EMIDI_SoundCanvas 1
#define EMIDI_AWE32 2
#define EMIDI_WaveBlaster 3
#define EMIDI_SoundBlaster 4
#define EMIDI_ProAudio 5
#define EMIDI_SoundMan16 6
#define EMIDI_Adlib 7
#define EMIDI_Soundscape 8
#define EMIDI_Ultrasound 9
#define EMIDI_AffectsCurrentCard( c, type ) \
( ( ( c ) == EMIDI_ALL_CARDS ) || ( ( c ) == ( type ) ) )
#define EMIDI_NUM_CONTEXTS 7
typedef struct
{
unsigned char *pos;
unsigned char *loopstart;
short loopcount;
short RunningStatus;
unsigned time;
long FPSecondsPerTick;
short tick;
short beat;
short measure;
short BeatsPerMeasure;
short TicksPerBeat;
short TimeBase;
long delay;
short active;
} songcontext;
typedef struct
{
unsigned char *start;
unsigned char *pos;
long delay;
short active;
short RunningStatus;
short currentcontext;
songcontext context[ EMIDI_NUM_CONTEXTS ];
char EMIDI_IncludeTrack;
char EMIDI_ProgramChange;
char EMIDI_VolumeChange;
} track;
static long _MIDI_ReadNumber( void *from, size_t size );
static long _MIDI_ReadDelta( track *ptr );
static void _MIDI_ResetTracks( void );
static void _MIDI_AdvanceTick( void );
static void _MIDI_MetaEvent( track *Track );
static void _MIDI_SysEx( track *Track );
static int _MIDI_InterpretControllerInfo( track *Track, int TimeSet,
int channel, int c1, int c2 );
//static
void _MIDI_ServiceRoutine( task *Task );
static int _MIDI_SendControlChange( int channel, int c1, int c2 );
static void _MIDI_SetChannelVolume( int channel, int volume );
static void _MIDI_SendChannelVolumes( void );
static int _MIDI_ProcessNextTick( void );
static void _MIDI_InitEMIDI( void );
/*
if ( c1 == EMIDI_LOOP_START )
{
if ( c2 == 0 )
{
Track->context[ 0 ].loopcount = EMIDI_INFINITE;
}
else
{
Track->context[ 0 ].loopcount = c2;
}
Track->context[ 0 ].pos = Track->pos;
Track->context[ 0 ].loopstart = Track->pos;
Track->context[ 0 ].RunningStatus = Track->RunningStatus;
Track->context[ 0 ].time = _MIDI_Time;
Track->context[ 0 ].FPSecondsPerTick = _MIDI_FPSecondsPerTick;
Track->context[ 0 ].tick = _MIDI_Tick;
Track->context[ 0 ].beat = _MIDI_Beat;
Track->context[ 0 ].measure = _MIDI_Measure;
Track->context[ 0 ].BeatsPerMeasure = _MIDI_BeatsPerMeasure;
Track->context[ 0 ].TicksPerBeat = _MIDI_TicksPerBeat;
Track->context[ 0 ].TimeBase = _MIDI_TimeBase;
break;
}
if ( ( c1 == EMIDI_LOOP_END ) &&
( c2 == EMIDI_END_LOOP_VALUE ) )
{
if ( ( Track->context[ 0 ].loopstart != NULL ) &&
( Track->context[ 0 ].loopcount != 0 ) )
{
if ( Track->context[ 0 ].loopcount != EMIDI_INFINITE )
{
Track->context[ 0 ].loopcount--;
}
Track->pos = Track->context[ 0 ].loopstart;
Track->RunningStatus = Track->context[ 0 ].RunningStatus;
if ( !TimeSet )
{
_MIDI_Time = Track->context[ 0 ].time;
_MIDI_FPSecondsPerTick = Track->context[ 0 ].FPSecondsPerTick;
_MIDI_Tick = Track->context[ 0 ].tick;
_MIDI_Beat = Track->context[ 0 ].beat;
_MIDI_Measure = Track->context[ 0 ].measure;
_MIDI_BeatsPerMeasure = Track->context[ 0 ].BeatsPerMeasure;
_MIDI_TicksPerBeat = Track->context[ 0 ].TicksPerBeat;
_MIDI_TimeBase = Track->context[ 0 ].TimeBase;
TimeSet = TRUE;
}
}
break;
}
if ( c1 == MIDI_MONO_MODE_ON )
{
Track->pos++;
}
if ( ( c1 == MIDI_VOLUME ) && ( !Track->EMIDI_VolumeChange ) )
{
_MIDI_SetChannelVolume( channel, c2 );
break;
}
else if ( ( c1 == EMIDI_VOLUME_CHANGE ) &&
( Track->EMIDI_VolumeChange ) )
{
_MIDI_SetChannelVolume( channel, c2 );
break;
}
if ( ( c1 == EMIDI_PROGRAM_CHANGE ) &&
( Track->EMIDI_ProgramChange ) )
{
_MIDI_Funcs->ProgramChange( channel, MIDI_PatchMap[ c2 & 0x7f ] );
break;
}
if ( c1 == EMIDI_CONTEXT_START )
{
break;
}
if ( c1 == EMIDI_CONTEXT_END )
{
if ( ( Track->currentcontext != _MIDI_Context ) ||
( Track->context[ _MIDI_Context ].pos == NULL )
{
break;
}
Track->currentcontext = _MIDI_Context;
Track->context[ 0 ].loopstart = Track->context[ _MIDI_Context ].loopstart;
Track->context[ 0 ].loopcount = Track->context[ _MIDI_Context ].loopcount;
Track->pos = Track->context[ _MIDI_Context ].pos;
Track->RunningStatus = Track->context[ _MIDI_Context ].RunningStatus;
if ( TimeSet )
{
break;
}
_MIDI_Time = Track->context[ _MIDI_Context ].time;
_MIDI_FPSecondsPerTick = Track->context[ _MIDI_Context ].FPSecondsPerTick;
_MIDI_Tick = Track->context[ _MIDI_Context ].tick;
_MIDI_Beat = Track->context[ _MIDI_Context ].beat;
_MIDI_Measure = Track->context[ _MIDI_Context ].measure;
_MIDI_BeatsPerMeasure = Track->context[ _MIDI_Context ].BeatsPerMeasure;
_MIDI_TicksPerBeat = Track->context[ _MIDI_Context ].TicksPerBeat;
_MIDI_TimeBase = Track->context[ _MIDI_Context ].TimeBase;
TimeSet = TRUE;
break;
}
if ( _MIDI_Funcs->ControlChange )
{
_MIDI_Funcs->ControlChange( channel, c1, c2 );
}
*/
#endif