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raze-gles/polymer/eduke32/source/midi.c
terminx 7466904eaf Bring out yer dead! 
git-svn-id: https://svn.eduke32.com/eduke32@5601 1a8010ca-5511-0410-912e-c29ae57300e0
2016-02-02 00:21:12 +00:00

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//-------------------------------------------------------------------------
/*
Copyright (C) 2016 EDuke32 developers and contributors
This file is part of EDuke32.
EDuke32 is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License version 2
as published by the Free Software Foundation.
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
//-------------------------------------------------------------------------
#include <stdlib.h>
#include <string.h>
#include "standard.h"
#include "music.h"
#include "_midi.h"
#include "midi.h"
#include "mpu401.h"
#include "compat.h"
#include "pragmas.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
extern int32_t MUSIC_SoundDevice;
static const int32_t _MIDI_CommandLengths[ NUM_MIDI_CHANNELS ] =
{
0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 1, 1, 2, 0
};
static track *_MIDI_TrackPtr = NULL;
static int32_t _MIDI_TrackMemSize;
static int32_t _MIDI_NumTracks;
static int32_t _MIDI_SongActive = FALSE;
static int32_t _MIDI_SongLoaded = FALSE;
static int32_t _MIDI_Loop = FALSE;
static int32_t _MIDI_Division;
static int32_t _MIDI_Tick = 0;
static int32_t _MIDI_Beat = 1;
static int32_t _MIDI_Measure = 1;
static uint32_t _MIDI_Time;
static int32_t _MIDI_BeatsPerMeasure;
static int32_t _MIDI_TicksPerBeat;
static int32_t _MIDI_TimeBase;
static int32_t _MIDI_FPSecondsPerTick;
static uint32_t _MIDI_TotalTime;
static int32_t _MIDI_TotalTicks;
static int32_t _MIDI_TotalBeats;
static int32_t _MIDI_TotalMeasures;
uint32_t _MIDI_PositionInTicks;
uint32_t _MIDI_GlobalPositionInTicks;
static int32_t _MIDI_Context;
static int32_t _MIDI_ActiveTracks;
static int32_t _MIDI_TotalVolume = MIDI_MaxVolume;
static int32_t _MIDI_ChannelVolume[ NUM_MIDI_CHANNELS ];
static midifuncs *_MIDI_Funcs = NULL;
static int32_t Reset = FALSE;
int32_t MIDI_Tempo = 120;
char MIDI_PatchMap[ 128 ];
/**********************************************************************
Memory locked functions:
**********************************************************************/
/*---------------------------------------------------------------------
Function: _MIDI_ReadNumber
Reads a variable length number from a MIDI track.
---------------------------------------------------------------------*/
static int32_t _MIDI_ReadNumber(void *from, size_t size)
{
if (size > 4)
size = 4;
char *FromPtr = (char *)from;
int32_t value = 0;
do
{
value <<= 8;
value += *FromPtr++;
} while (size--);
return value;
}
/*---------------------------------------------------------------------
Function: _MIDI_ReadDelta
Reads a variable length encoded delta delay time from the MIDI data.
---------------------------------------------------------------------*/
static int32_t _MIDI_ReadDelta(track *ptr)
{
int32_t value;
GET_NEXT_EVENT(ptr, value);
if (value & 0x80)
{
value &= 0x7f;
char c;
do
{
GET_NEXT_EVENT(ptr, c);
value = (value << 7) + (c & 0x7f);
}
while (c & 0x80);
}
return value;
}
/*---------------------------------------------------------------------
Function: _MIDI_ResetTracks
Sets the track pointers to the beginning of the song.
---------------------------------------------------------------------*/
static void _MIDI_ResetTracks(void)
{
_MIDI_Tick = 0;
_MIDI_Beat = 1;
_MIDI_Measure = 1;
_MIDI_Time = 0;
_MIDI_BeatsPerMeasure = 4;
_MIDI_TicksPerBeat = _MIDI_Division;
_MIDI_TimeBase = 4;
_MIDI_PositionInTicks = 0;
//_MIDI_GlobalPositionInTicks = 0;
_MIDI_ActiveTracks = 0;
_MIDI_Context = 0;
track *ptr = _MIDI_TrackPtr;
for (int i = 0; i < _MIDI_NumTracks; i++)
{
ptr->pos = ptr->start;
ptr->delay = _MIDI_ReadDelta(ptr);
ptr->active = ptr->EMIDI_IncludeTrack;
ptr->RunningStatus = 0;
ptr->currentcontext = 0;
ptr->context[ 0 ].loopstart = ptr->start;
ptr->context[ 0 ].loopcount = 0;
if (ptr->active)
_MIDI_ActiveTracks++;
ptr++;
}
}
/*---------------------------------------------------------------------
Function: _MIDI_AdvanceTick
Increment tick counters.
---------------------------------------------------------------------*/
static void _MIDI_AdvanceTick(void)
{
_MIDI_PositionInTicks++;
_MIDI_Time += _MIDI_FPSecondsPerTick;
while (++_MIDI_Tick > _MIDI_TicksPerBeat)
{
_MIDI_Tick -= _MIDI_TicksPerBeat;
_MIDI_Beat++;
}
while (_MIDI_Beat > _MIDI_BeatsPerMeasure)
{
_MIDI_Beat -= _MIDI_BeatsPerMeasure;
_MIDI_Measure++;
}
}
/*---------------------------------------------------------------------
Function: _MIDI_SysEx
Interpret SysEx Event.
---------------------------------------------------------------------*/
static void _MIDI_SysEx(track *Track)
{
int32_t const length = _MIDI_ReadDelta(Track);
Track->pos += length;
}
/*---------------------------------------------------------------------
Function: _MIDI_MetaEvent
Interpret Meta Event.
---------------------------------------------------------------------*/
static void _MIDI_MetaEvent(track *Track)
{
int32_t command;
int32_t length;
GET_NEXT_EVENT(Track, command);
GET_NEXT_EVENT(Track, length);
switch (command)
{
case MIDI_END_OF_TRACK :
Track->active = FALSE;
_MIDI_ActiveTracks--;
break;
case MIDI_TEMPO_CHANGE :
MIDI_SetTempo(
tabledivide32_noinline(60000000L, _MIDI_ReadNumber(Track->pos, 3)));
break;
case MIDI_TIME_SIGNATURE :
{
if ((_MIDI_Tick > 0) || (_MIDI_Beat > 1))
_MIDI_Measure++;
_MIDI_Tick = 0;
_MIDI_Beat = 1;
_MIDI_BeatsPerMeasure = (int32_t) *Track->pos;
int32_t denominator = (int32_t) *(Track->pos + 1);
_MIDI_TimeBase = 1;
while (denominator > 0)
{
_MIDI_TimeBase += _MIDI_TimeBase;
denominator--;
}
_MIDI_TicksPerBeat = tabledivide32_noinline(_MIDI_Division * 4, _MIDI_TimeBase);
break;
}
}
Track->pos += length;
}
/*---------------------------------------------------------------------
Function: _MIDI_InterpretControllerInfo
Interprets the MIDI controller info.
---------------------------------------------------------------------*/
static int32_t _MIDI_InterpretControllerInfo(track *Track, int32_t TimeSet, int32_t channel, int32_t c1, int32_t c2)
{
track *trackptr;
int32_t tracknum;
int32_t loopcount;
switch (c1)
{
case MIDI_MONO_MODE_ON :
Track->pos++;
break;
case MIDI_VOLUME :
if (!Track->EMIDI_VolumeChange)
_MIDI_SetChannelVolume(channel, c2);
break;
case EMIDI_INCLUDE_TRACK :
case EMIDI_EXCLUDE_TRACK :
break;
case EMIDI_PROGRAM_CHANGE :
if (Track->EMIDI_ProgramChange)
_MIDI_Funcs->ProgramChange(channel, MIDI_PatchMap[ c2 & 0x7f ]);
break;
case EMIDI_VOLUME_CHANGE :
if (Track->EMIDI_VolumeChange)
_MIDI_SetChannelVolume(channel, c2);
break;
case EMIDI_CONTEXT_START :
break;
case EMIDI_CONTEXT_END :
if ((Track->currentcontext == _MIDI_Context) || (_MIDI_Context < 0) ||
(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;
case EMIDI_LOOP_START :
case EMIDI_SONG_LOOP_START :
loopcount = c2 ? c2 : EMIDI_INFINITE;
if (c1 == EMIDI_SONG_LOOP_START)
{
trackptr = _MIDI_TrackPtr;
tracknum = _MIDI_NumTracks;
}
else
{
trackptr = Track;
tracknum = 1;
}
while (tracknum > 0)
{
trackptr->context[ 0 ].loopcount = loopcount;
trackptr->context[ 0 ].pos = trackptr->pos;
trackptr->context[ 0 ].loopstart = trackptr->pos;
trackptr->context[ 0 ].RunningStatus = trackptr->RunningStatus;
trackptr->context[ 0 ].active = trackptr->active;
trackptr->context[ 0 ].delay = trackptr->delay;
trackptr->context[ 0 ].time = _MIDI_Time;
trackptr->context[ 0 ].FPSecondsPerTick = _MIDI_FPSecondsPerTick;
trackptr->context[ 0 ].tick = _MIDI_Tick;
trackptr->context[ 0 ].beat = _MIDI_Beat;
trackptr->context[ 0 ].measure = _MIDI_Measure;
trackptr->context[ 0 ].BeatsPerMeasure = _MIDI_BeatsPerMeasure;
trackptr->context[ 0 ].TicksPerBeat = _MIDI_TicksPerBeat;
trackptr->context[ 0 ].TimeBase = _MIDI_TimeBase;
trackptr++;
tracknum--;
}
break;
case EMIDI_LOOP_END :
case EMIDI_SONG_LOOP_END :
if ((c2 != EMIDI_END_LOOP_VALUE) || (Track->context[0].loopstart == NULL) || (Track->context[0].loopcount == 0))
break;
if (c1 == EMIDI_SONG_LOOP_END)
{
trackptr = _MIDI_TrackPtr;
tracknum = _MIDI_NumTracks;
_MIDI_ActiveTracks = 0;
}
else
{
trackptr = Track;
tracknum = 1;
_MIDI_ActiveTracks--;
}
while (tracknum > 0)
{
if (trackptr->context[ 0 ].loopcount != EMIDI_INFINITE)
trackptr->context[ 0 ].loopcount--;
trackptr->pos = trackptr->context[ 0 ].loopstart;
trackptr->RunningStatus = trackptr->context[ 0 ].RunningStatus;
trackptr->delay = trackptr->context[ 0 ].delay;
trackptr->active = trackptr->context[ 0 ].active;
if (trackptr->active)
_MIDI_ActiveTracks++;
if (!TimeSet)
{
_MIDI_Time = trackptr->context[ 0 ].time;
_MIDI_FPSecondsPerTick = trackptr->context[ 0 ].FPSecondsPerTick;
_MIDI_Tick = trackptr->context[ 0 ].tick;
_MIDI_Beat = trackptr->context[ 0 ].beat;
_MIDI_Measure = trackptr->context[ 0 ].measure;
_MIDI_BeatsPerMeasure = trackptr->context[ 0 ].BeatsPerMeasure;
_MIDI_TicksPerBeat = trackptr->context[ 0 ].TicksPerBeat;
_MIDI_TimeBase = trackptr->context[ 0 ].TimeBase;
TimeSet = TRUE;
}
trackptr++;
tracknum--;
}
break;
default :
if (_MIDI_Funcs->ControlChange)
_MIDI_Funcs->ControlChange(channel, c1, c2);
}
return TimeSet;
}
/*---------------------------------------------------------------------
Function: _MIDI_ServiceRoutine
Task that interperates the MIDI data.
---------------------------------------------------------------------*/
static int32_t _MIDI_ServiceRoutine(void)
{
if (_MIDI_SongActive)
{
int32_t TimeSet = FALSE;
track *Track = _MIDI_TrackPtr;
int32_t tracknum = 0;
while (tracknum < _MIDI_NumTracks)
{
while ((Track->active) && (Track->delay == 0))
{
int32_t event;
GET_NEXT_EVENT(Track, event);
if (GET_MIDI_COMMAND(event) == MIDI_SPECIAL)
{
switch (event)
{
case MIDI_SYSEX :
case MIDI_SYSEX_CONTINUE :
_MIDI_SysEx(Track);
break;
case MIDI_META_EVENT :
_MIDI_MetaEvent(Track);
break;
}
if (Track->active)
Track->delay = _MIDI_ReadDelta(Track);
continue;
}
if (event & MIDI_RUNNING_STATUS)
{
Track->RunningStatus = event;
}
else
{
event = Track->RunningStatus;
Track->pos--;
}
int32_t channel = GET_MIDI_CHANNEL(event);
int32_t command = GET_MIDI_COMMAND(event);
int32_t c1 = 0;
int32_t c2 = 0;
if (_MIDI_CommandLengths[ command ] > 0)
{
GET_NEXT_EVENT(Track, c1);
if (_MIDI_CommandLengths[ command ] > 1)
GET_NEXT_EVENT(Track, c2);
}
switch (command)
{
case MIDI_NOTE_OFF :
if (_MIDI_Funcs->NoteOff)
_MIDI_Funcs->NoteOff(channel, c1, c2);
break;
case MIDI_NOTE_ON :
if (_MIDI_Funcs->NoteOn)
_MIDI_Funcs->NoteOn(channel, c1, c2);
break;
case MIDI_POLY_AFTER_TCH :
if (_MIDI_Funcs->PolyAftertouch)
_MIDI_Funcs->PolyAftertouch(channel, c1, c2);
break;
case MIDI_CONTROL_CHANGE :
TimeSet = _MIDI_InterpretControllerInfo(Track, TimeSet, channel, c1, c2);
break;
case MIDI_PROGRAM_CHANGE :
if ((_MIDI_Funcs->ProgramChange) && (!Track->EMIDI_ProgramChange))
_MIDI_Funcs->ProgramChange(channel, MIDI_PatchMap[ c1 & 0x7f ]);
break;
case MIDI_AFTER_TOUCH :
if (_MIDI_Funcs->ChannelAftertouch)
_MIDI_Funcs->ChannelAftertouch(channel, c1);
break;
case MIDI_PITCH_BEND :
if (_MIDI_Funcs->PitchBend)
_MIDI_Funcs->PitchBend(channel, c1, c2);
break;
default :
break;
}
Track->delay = _MIDI_ReadDelta(Track);
}
Track->delay--;
Track++;
tracknum++;
if (_MIDI_ActiveTracks == 0)
{
_MIDI_ResetTracks();
if (_MIDI_Loop)
{
tracknum = 0;
Track = _MIDI_TrackPtr;
}
else
{
_MIDI_SongActive = FALSE;
break;
}
}
}
_MIDI_AdvanceTick();
_MIDI_GlobalPositionInTicks++;
}
return 0;
}
static int32_t _MIDI_SendControlChange(int32_t channel, int32_t c1, int32_t c2)
{
if (_MIDI_Funcs == NULL || _MIDI_Funcs->ControlChange == NULL)
return MIDI_Error;
_MIDI_Funcs->ControlChange(channel, c1, c2);
return MIDI_Ok;
}
int32_t MIDI_AllNotesOff(void)
{
for (int32_t channel = 0; channel < NUM_MIDI_CHANNELS; channel++)
{
_MIDI_SendControlChange(channel, 0x40, 0);
_MIDI_SendControlChange(channel, MIDI_ALL_NOTES_OFF, 0);
_MIDI_SendControlChange(channel, 0x78, 0);
}
return MIDI_Ok;
}
static void _MIDI_SetChannelVolume(int32_t channel, int32_t volume)
{
_MIDI_ChannelVolume[ channel ] = volume;
if (_MIDI_Funcs == NULL || _MIDI_Funcs->ControlChange == NULL)
return;
_MIDI_Funcs->ControlChange(channel, MIDI_VOLUME, volume);
}
static void _MIDI_SendChannelVolumes(void)
{
for (int32_t channel = 0; channel < NUM_MIDI_CHANNELS; channel++)
_MIDI_SetChannelVolume(channel, _MIDI_ChannelVolume[ channel ]);
}
int32_t MIDI_Reset(void)
{
MIDI_AllNotesOff();
for (int32_t channel = 0; channel < NUM_MIDI_CHANNELS; channel++)
{
_MIDI_SendControlChange(channel, MIDI_RESET_ALL_CONTROLLERS, 0);
_MIDI_SendControlChange(channel, MIDI_RPN_MSB, MIDI_PITCHBEND_MSB);
_MIDI_SendControlChange(channel, MIDI_RPN_LSB, MIDI_PITCHBEND_LSB);
_MIDI_SendControlChange(channel, MIDI_DATAENTRY_MSB, 2); /* Pitch Bend Sensitivity MSB */
_MIDI_SendControlChange(channel, MIDI_DATAENTRY_LSB, 0); /* Pitch Bend Sensitivity LSB */
_MIDI_ChannelVolume[ channel ] = GENMIDI_DefaultVolume;
}
_MIDI_SendChannelVolumes();
Reset = TRUE;
return MIDI_Ok;
}
/*---------------------------------------------------------------------
Function: MIDI_SetVolume
Sets the total volume of the music.
---------------------------------------------------------------------*/
int32_t MIDI_SetVolume(int32_t volume)
{
if (_MIDI_Funcs == NULL)
return MIDI_NullMidiModule;
volume = clamp(volume, 0, MIDI_MaxVolume);
_MIDI_TotalVolume = volume;
_MIDI_SendChannelVolumes();
return MIDI_Ok;
}
void MIDI_ContinueSong(void)
{
if (_MIDI_SongLoaded)
{
_MIDI_SongActive = TRUE;
MPU_Unpause();
}
}
void MIDI_PauseSong(void)
{
if (_MIDI_SongLoaded)
{
_MIDI_SongActive = FALSE;
MIDI_AllNotesOff();
MPU_Pause();
}
}
/*---------------------------------------------------------------------
Function: MIDI_SetMidiFuncs
Selects the routines that send the MIDI data to the music device.
---------------------------------------------------------------------*/
void MIDI_SetMidiFuncs(midifuncs *funcs) { _MIDI_Funcs = funcs; }
void MIDI_StopSong(void)
{
if (_MIDI_SongLoaded)
{
_MIDI_SongActive = FALSE;
_MIDI_SongLoaded = FALSE;
MIDI_Reset();
_MIDI_ResetTracks();
DO_FREE_AND_NULL(_MIDI_TrackPtr);
_MIDI_NumTracks = 0;
_MIDI_TrackMemSize = 0;
_MIDI_TotalTime = 0;
_MIDI_TotalTicks = 0;
_MIDI_TotalBeats = 0;
_MIDI_TotalMeasures = 0;
MPU_Reset();
}
}
int32_t MIDI_PlaySong(char *song, int32_t loopflag)
{
if (_MIDI_SongLoaded)
MIDI_StopSong();
MPU_Init(MUSIC_SoundDevice);
_MIDI_Loop = loopflag;
if (_MIDI_Funcs == NULL)
return MIDI_NullMidiModule;
if (B_UNBUF32(song) != MIDI_HEADER_SIGNATURE)
return MIDI_InvalidMidiFile;
song += sizeof(int32_t);
int headersize = _MIDI_ReadNumber(song, sizeof(int32_t));
song += sizeof(int32_t);
int format = _MIDI_ReadNumber(song, sizeof(int16_t));
_MIDI_NumTracks = _MIDI_ReadNumber(song + sizeof(int16_t), sizeof(int16_t));
_MIDI_Division = _MIDI_ReadNumber(song + sizeof(int16_t) + sizeof(int16_t), sizeof(int16_t));
// If a SMPTE time division is given, just set to 96 so no errors occur
if (_MIDI_Division < 0)
_MIDI_Division = 96;
if (format > MAX_FORMAT)
return MIDI_UnknownMidiFormat;
char *ptr = song + headersize;
if (_MIDI_NumTracks == 0)
return MIDI_NoTracks;
_MIDI_TrackMemSize = _MIDI_NumTracks * sizeof(track);
_MIDI_TrackPtr = (track *)Xmalloc(_MIDI_TrackMemSize);
track *CurrentTrack = _MIDI_TrackPtr;
int numtracks = _MIDI_NumTracks-1;
do
{
if (B_UNBUF32(ptr) != MIDI_TRACK_SIGNATURE)
{
DO_FREE_AND_NULL(_MIDI_TrackPtr);
_MIDI_TrackMemSize = 0;
return MIDI_InvalidTrack;
}
int tracklength = _MIDI_ReadNumber(ptr + sizeof(int32_t), sizeof(int32_t));
ptr += sizeof(int32_t) + sizeof(int32_t);
CurrentTrack->start = ptr;
ptr += tracklength;
CurrentTrack++;
}
while (numtracks--);
_MIDI_InitEMIDI();
_MIDI_ResetTracks();
if (!Reset)
MIDI_Reset();
Reset = FALSE;
MIDI_SetDivision(_MIDI_Division);
_MIDI_SongLoaded = TRUE;
_MIDI_SongActive = TRUE;
while (_MPU_BuffersWaiting < 4) _MIDI_ServiceRoutine();
MPU_BeginPlayback();
return MIDI_Ok;
}
void MIDI_SetTempo(int32_t tempo)
{
MIDI_Tempo = tempo;
_MIDI_FPSecondsPerTick = tabledivide32_noinline(1 << TIME_PRECISION, ((tempo * _MIDI_Division) / 60));
MPU_SetTempo(tempo);
}
void MIDI_SetDivision(int32_t division)
{
MPU_SetDivision(division);
}
static void _MIDI_InitEMIDI(void)
{
int32_t const type = EMIDI_GeneralMIDI;
_MIDI_ResetTracks();
_MIDI_TotalTime = 0;
_MIDI_TotalTicks = 0;
_MIDI_TotalBeats = 0;
_MIDI_TotalMeasures = 0;
track *Track = _MIDI_TrackPtr;
int32_t tracknum = 0;
while ((tracknum < _MIDI_NumTracks) && (Track != NULL))
{
_MIDI_Tick = 0;
_MIDI_Beat = 1;
_MIDI_Measure = 1;
_MIDI_Time = 0;
_MIDI_BeatsPerMeasure = 4;
_MIDI_TicksPerBeat = _MIDI_Division;
_MIDI_TimeBase = 4;
_MIDI_PositionInTicks = 0;
_MIDI_ActiveTracks = 0;
_MIDI_Context = -1;
Track->RunningStatus = 0;
Track->active = TRUE;
Track->EMIDI_ProgramChange = FALSE;
Track->EMIDI_VolumeChange = FALSE;
Track->EMIDI_IncludeTrack = TRUE;
memset(Track->context, 0, sizeof(Track->context));
while (Track->delay > 0)
{
_MIDI_AdvanceTick();
Track->delay--;
}
int IncludeFound = FALSE;
while (Track->active)
{
int32_t event;
GET_NEXT_EVENT(Track, event);
if (GET_MIDI_COMMAND(event) == MIDI_SPECIAL)
{
switch (event)
{
case MIDI_SYSEX :
case MIDI_SYSEX_CONTINUE :
_MIDI_SysEx(Track);
break;
case MIDI_META_EVENT :
_MIDI_MetaEvent(Track);
break;
}
if (Track->active)
{
Track->delay = _MIDI_ReadDelta(Track);
while (Track->delay > 0)
{
_MIDI_AdvanceTick();
Track->delay--;
}
}
continue;
}
if (event & MIDI_RUNNING_STATUS)
Track->RunningStatus = event;
else
{
event = Track->RunningStatus;
Track->pos--;
}
int32_t const command = GET_MIDI_COMMAND(event);
int32_t length = _MIDI_CommandLengths[ command ];
if (command == MIDI_CONTROL_CHANGE)
{
if (*Track->pos == MIDI_MONO_MODE_ON)
length++;
int32_t c1, c2;
GET_NEXT_EVENT(Track, c1);
GET_NEXT_EVENT(Track, c2);
length -= 2;
switch (c1)
{
case EMIDI_LOOP_START :
case EMIDI_SONG_LOOP_START :
Track->context[ 0 ].loopcount = c2 ? c2 : EMIDI_INFINITE;
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;
case EMIDI_LOOP_END :
case EMIDI_SONG_LOOP_END :
if (c2 == EMIDI_END_LOOP_VALUE)
{
Track->context[ 0 ].loopstart = NULL;
Track->context[ 0 ].loopcount = 0;
}
break;
case EMIDI_INCLUDE_TRACK :
if (EMIDI_AffectsCurrentCard(c2, type))
{
//printf( "Include track %d on card %d\n", tracknum, c2 );
IncludeFound = TRUE;
Track->EMIDI_IncludeTrack = TRUE;
}
else if (!IncludeFound)
{
//printf( "Track excluded %d on card %d\n", tracknum, c2 );
IncludeFound = TRUE;
Track->EMIDI_IncludeTrack = FALSE;
}
break;
case EMIDI_EXCLUDE_TRACK :
if (EMIDI_AffectsCurrentCard(c2, type))
{
//printf( "Exclude track %d on card %d\n", tracknum, c2 );
Track->EMIDI_IncludeTrack = FALSE;
}
break;
case EMIDI_PROGRAM_CHANGE :
if (!Track->EMIDI_ProgramChange)
//printf( "Program change on track %d\n", tracknum );
Track->EMIDI_ProgramChange = TRUE;
break;
case EMIDI_VOLUME_CHANGE :
if (!Track->EMIDI_VolumeChange)
//printf( "Volume change on track %d\n", tracknum );
Track->EMIDI_VolumeChange = TRUE;
break;
case EMIDI_CONTEXT_START :
if ((c2 > 0) && (c2 < EMIDI_NUM_CONTEXTS))
{
Track->context[ c2 ].pos = Track->pos;
Track->context[ c2 ].loopstart = Track->context[ 0 ].loopstart;
Track->context[ c2 ].loopcount = Track->context[ 0 ].loopcount;
Track->context[ c2 ].RunningStatus = Track->RunningStatus;
Track->context[ c2 ].time = _MIDI_Time;
Track->context[ c2 ].FPSecondsPerTick = _MIDI_FPSecondsPerTick;
Track->context[ c2 ].tick = _MIDI_Tick;
Track->context[ c2 ].beat = _MIDI_Beat;
Track->context[ c2 ].measure = _MIDI_Measure;
Track->context[ c2 ].BeatsPerMeasure = _MIDI_BeatsPerMeasure;
Track->context[ c2 ].TicksPerBeat = _MIDI_TicksPerBeat;
Track->context[ c2 ].TimeBase = _MIDI_TimeBase;
}
break;
case EMIDI_CONTEXT_END :
break;
}
}
Track->pos += length;
Track->delay = _MIDI_ReadDelta(Track);
while (Track->delay > 0)
{
_MIDI_AdvanceTick();
Track->delay--;
}
}
_MIDI_TotalTime = max(_MIDI_TotalTime, _MIDI_Time);
if (RELATIVE_BEAT(_MIDI_Measure, _MIDI_Beat, _MIDI_Tick) >
RELATIVE_BEAT(_MIDI_TotalMeasures, _MIDI_TotalBeats, _MIDI_TotalTicks))
{
_MIDI_TotalTicks = _MIDI_Tick;
_MIDI_TotalBeats = _MIDI_Beat;
_MIDI_TotalMeasures = _MIDI_Measure;
}
Track++;
tracknum++;
}
_MIDI_ResetTracks();
}
void MIDI_UpdateMusic(void)
{
if (!_MIDI_SongLoaded || !_MIDI_SongActive) return;
while (_MPU_BuffersWaiting < 4) _MIDI_ServiceRoutine();
}
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