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a557eedf7e
git-svn-id: https://svn.eduke32.com/eduke32@5352 1a8010ca-5511-0410-912e-c29ae57300e0
2057 lines
50 KiB
C
2057 lines
50 KiB
C
//-------------------------------------------------------------------------
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/*
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Copyright (C) 2010 EDuke32 developers and contributors
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This file is part of EDuke32.
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EDuke32 is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License version 2
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as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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//-------------------------------------------------------------------------
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/**********************************************************************
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module: MIDI.C
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author: James R. Dose
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date: May 25, 1994
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Midi song file playback routines.
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(c) Copyright 1994 James R. Dose. All Rights Reserved.
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**********************************************************************/
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#include <stdlib.h>
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#include <string.h>
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#include "standard.h"
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#include "music.h"
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#include "_midi.h"
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#include "midi.h"
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#include "mpu401.h"
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#include "compat.h"
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#include "pragmas.h"
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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extern int32_t MUSIC_SoundDevice;
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static const int32_t _MIDI_CommandLengths[ NUM_MIDI_CHANNELS ] =
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{
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0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 1, 1, 2, 0
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};
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static int32_t (*_MIDI_RerouteFunctions[ NUM_MIDI_CHANNELS ])(int32_t, int32_t, int32_t);
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static track *_MIDI_TrackPtr = NULL;
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static int32_t _MIDI_TrackMemSize;
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static int32_t _MIDI_NumTracks;
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static int32_t _MIDI_SongActive = FALSE;
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static int32_t _MIDI_SongLoaded = FALSE;
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static int32_t _MIDI_Loop = FALSE;
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static int32_t _MIDI_Division;
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static int32_t _MIDI_Tick = 0;
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static int32_t _MIDI_Beat = 1;
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static int32_t _MIDI_Measure = 1;
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static uint32_t _MIDI_Time;
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static int32_t _MIDI_BeatsPerMeasure;
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static int32_t _MIDI_TicksPerBeat;
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static int32_t _MIDI_TimeBase;
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static int32_t _MIDI_FPSecondsPerTick;
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static uint32_t _MIDI_TotalTime;
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static int32_t _MIDI_TotalTicks;
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static int32_t _MIDI_TotalBeats;
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static int32_t _MIDI_TotalMeasures;
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uint32_t _MIDI_PositionInTicks;
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uint32_t _MIDI_GlobalPositionInTicks;
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static int32_t _MIDI_Context;
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static int32_t _MIDI_ActiveTracks;
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static int32_t _MIDI_TotalVolume = MIDI_MaxVolume;
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static int32_t _MIDI_ChannelVolume[ NUM_MIDI_CHANNELS ];
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static int32_t _MIDI_UserChannelVolume[ NUM_MIDI_CHANNELS ] =
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{
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256, 256, 256, 256, 256, 256, 256, 256,
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256, 256, 256, 256, 256, 256, 256, 256
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};
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static midifuncs *_MIDI_Funcs = NULL;
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static int32_t Reset = FALSE;
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int32_t MIDI_Tempo = 120;
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char MIDI_PatchMap[ 128 ];
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/**********************************************************************
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Memory locked functions:
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**********************************************************************/
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/*---------------------------------------------------------------------
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Function: _MIDI_ReadNumber
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Reads a variable length number from a MIDI track.
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---------------------------------------------------------------------*/
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static int32_t _MIDI_ReadNumber
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(
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void *from,
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size_t size
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)
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{
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char *FromPtr;
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int32_t value;
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if (size > 4)
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{
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size = 4;
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}
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FromPtr = (char *)from;
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value = 0;
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while (size--)
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{
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value <<= 8;
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value += *FromPtr++;
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}
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return(value);
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}
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/*---------------------------------------------------------------------
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Function: _MIDI_ReadDelta
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Reads a variable length encoded delta delay time from the MIDI data.
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---------------------------------------------------------------------*/
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static int32_t _MIDI_ReadDelta
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(
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track *ptr
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)
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{
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int32_t value;
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char c;
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GET_NEXT_EVENT(ptr, value);
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if (value & 0x80)
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{
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value &= 0x7f;
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do
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{
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GET_NEXT_EVENT(ptr, c);
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value = (value << 7) + (c & 0x7f);
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}
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while (c & 0x80);
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}
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return(value);
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}
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/*---------------------------------------------------------------------
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Function: _MIDI_ResetTracks
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Sets the track pointers to the beginning of the song.
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---------------------------------------------------------------------*/
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static void _MIDI_ResetTracks
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(
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void
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)
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{
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int32_t i;
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track *ptr;
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_MIDI_Tick = 0;
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_MIDI_Beat = 1;
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_MIDI_Measure = 1;
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_MIDI_Time = 0;
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_MIDI_BeatsPerMeasure = 4;
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_MIDI_TicksPerBeat = _MIDI_Division;
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_MIDI_TimeBase = 4;
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_MIDI_PositionInTicks = 0;
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//_MIDI_GlobalPositionInTicks = 0;
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_MIDI_ActiveTracks = 0;
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_MIDI_Context = 0;
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ptr = _MIDI_TrackPtr;
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for (i = 0; i < _MIDI_NumTracks; i++)
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{
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ptr->pos = ptr->start;
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ptr->delay = _MIDI_ReadDelta(ptr);
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ptr->active = ptr->EMIDI_IncludeTrack;
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ptr->RunningStatus = 0;
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ptr->currentcontext = 0;
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ptr->context[ 0 ].loopstart = ptr->start;
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ptr->context[ 0 ].loopcount = 0;
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if (ptr->active)
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{
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_MIDI_ActiveTracks++;
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}
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ptr++;
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}
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}
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/*---------------------------------------------------------------------
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Function: _MIDI_AdvanceTick
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Increment tick counters.
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---------------------------------------------------------------------*/
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static void _MIDI_AdvanceTick
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(
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void
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)
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{
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_MIDI_PositionInTicks++;
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_MIDI_Time += _MIDI_FPSecondsPerTick;
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_MIDI_Tick++;
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while (_MIDI_Tick > _MIDI_TicksPerBeat)
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{
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_MIDI_Tick -= _MIDI_TicksPerBeat;
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_MIDI_Beat++;
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}
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while (_MIDI_Beat > _MIDI_BeatsPerMeasure)
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{
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_MIDI_Beat -= _MIDI_BeatsPerMeasure;
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_MIDI_Measure++;
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}
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}
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/*---------------------------------------------------------------------
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Function: _MIDI_SysEx
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Interpret SysEx Event.
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---------------------------------------------------------------------*/
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static void _MIDI_SysEx
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(
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track *Track
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)
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{
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int32_t length;
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length = _MIDI_ReadDelta(Track);
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Track->pos += length;
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}
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/*---------------------------------------------------------------------
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Function: _MIDI_MetaEvent
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Interpret Meta Event.
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---------------------------------------------------------------------*/
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static void _MIDI_MetaEvent
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(
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track *Track
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)
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{
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int32_t command;
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int32_t length;
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int32_t denominator;
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int32_t tempo;
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GET_NEXT_EVENT(Track, command);
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GET_NEXT_EVENT(Track, length);
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switch (command)
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{
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case MIDI_END_OF_TRACK :
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Track->active = FALSE;
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_MIDI_ActiveTracks--;
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break;
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case MIDI_TEMPO_CHANGE :
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tempo = tabledivide32_noinline(60000000L, _MIDI_ReadNumber(Track->pos, 3));
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MIDI_SetTempo(tempo);
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break;
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case MIDI_TIME_SIGNATURE :
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if ((_MIDI_Tick > 0) || (_MIDI_Beat > 1))
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{
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_MIDI_Measure++;
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}
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_MIDI_Tick = 0;
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_MIDI_Beat = 1;
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_MIDI_BeatsPerMeasure = (int32_t)*Track->pos;
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denominator = (int32_t)*(Track->pos + 1);
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_MIDI_TimeBase = 1;
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while (denominator > 0)
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{
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_MIDI_TimeBase += _MIDI_TimeBase;
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denominator--;
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}
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_MIDI_TicksPerBeat = tabledivide32_noinline(_MIDI_Division * 4, _MIDI_TimeBase);
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break;
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}
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Track->pos += length;
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}
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/*---------------------------------------------------------------------
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Function: _MIDI_InterpretControllerInfo
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Interprets the MIDI controller info.
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---------------------------------------------------------------------*/
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static int32_t _MIDI_InterpretControllerInfo
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(
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track *Track,
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int32_t TimeSet,
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int32_t channel,
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int32_t c1,
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int32_t c2
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)
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{
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track *trackptr;
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int32_t tracknum;
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int32_t loopcount;
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switch (c1)
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{
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case MIDI_MONO_MODE_ON :
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Track->pos++;
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break;
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case MIDI_VOLUME :
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if (!Track->EMIDI_VolumeChange)
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{
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_MIDI_SetChannelVolume(channel, c2);
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}
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break;
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case EMIDI_INCLUDE_TRACK :
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case EMIDI_EXCLUDE_TRACK :
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break;
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case EMIDI_PROGRAM_CHANGE :
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if (Track->EMIDI_ProgramChange)
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{
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_MIDI_Funcs->ProgramChange(channel, MIDI_PatchMap[ c2 & 0x7f ]);
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}
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break;
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case EMIDI_VOLUME_CHANGE :
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if (Track->EMIDI_VolumeChange)
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{
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_MIDI_SetChannelVolume(channel, c2);
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}
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break;
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case EMIDI_CONTEXT_START :
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break;
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case EMIDI_CONTEXT_END :
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if ((Track->currentcontext == _MIDI_Context) ||
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(_MIDI_Context < 0) ||
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(Track->context[ _MIDI_Context ].pos == NULL))
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{
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break;
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}
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Track->currentcontext = _MIDI_Context;
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Track->context[ 0 ].loopstart = Track->context[ _MIDI_Context ].loopstart;
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Track->context[ 0 ].loopcount = Track->context[ _MIDI_Context ].loopcount;
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Track->pos = Track->context[ _MIDI_Context ].pos;
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Track->RunningStatus = Track->context[ _MIDI_Context ].RunningStatus;
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if (TimeSet)
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{
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break;
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}
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_MIDI_Time = Track->context[ _MIDI_Context ].time;
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_MIDI_FPSecondsPerTick = Track->context[ _MIDI_Context ].FPSecondsPerTick;
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_MIDI_Tick = Track->context[ _MIDI_Context ].tick;
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_MIDI_Beat = Track->context[ _MIDI_Context ].beat;
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_MIDI_Measure = Track->context[ _MIDI_Context ].measure;
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_MIDI_BeatsPerMeasure = Track->context[ _MIDI_Context ].BeatsPerMeasure;
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_MIDI_TicksPerBeat = Track->context[ _MIDI_Context ].TicksPerBeat;
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_MIDI_TimeBase = Track->context[ _MIDI_Context ].TimeBase;
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TimeSet = TRUE;
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break;
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case EMIDI_LOOP_START :
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case EMIDI_SONG_LOOP_START :
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if (c2 == 0)
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{
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loopcount = EMIDI_INFINITE;
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}
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else
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{
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loopcount = c2;
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}
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if (c1 == EMIDI_SONG_LOOP_START)
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{
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trackptr = _MIDI_TrackPtr;
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tracknum = _MIDI_NumTracks;
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}
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else
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{
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trackptr = Track;
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tracknum = 1;
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}
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while (tracknum > 0)
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{
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trackptr->context[ 0 ].loopcount = loopcount;
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trackptr->context[ 0 ].pos = trackptr->pos;
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trackptr->context[ 0 ].loopstart = trackptr->pos;
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trackptr->context[ 0 ].RunningStatus = trackptr->RunningStatus;
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trackptr->context[ 0 ].active = trackptr->active;
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trackptr->context[ 0 ].delay = trackptr->delay;
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trackptr->context[ 0 ].time = _MIDI_Time;
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trackptr->context[ 0 ].FPSecondsPerTick = _MIDI_FPSecondsPerTick;
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trackptr->context[ 0 ].tick = _MIDI_Tick;
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trackptr->context[ 0 ].beat = _MIDI_Beat;
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trackptr->context[ 0 ].measure = _MIDI_Measure;
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trackptr->context[ 0 ].BeatsPerMeasure = _MIDI_BeatsPerMeasure;
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trackptr->context[ 0 ].TicksPerBeat = _MIDI_TicksPerBeat;
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trackptr->context[ 0 ].TimeBase = _MIDI_TimeBase;
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trackptr++;
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tracknum--;
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}
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break;
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case EMIDI_LOOP_END :
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case EMIDI_SONG_LOOP_END :
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if ((c2 != EMIDI_END_LOOP_VALUE) ||
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(Track->context[ 0 ].loopstart == NULL) ||
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(Track->context[ 0 ].loopcount == 0))
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{
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break;
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}
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if (c1 == EMIDI_SONG_LOOP_END)
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{
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trackptr = _MIDI_TrackPtr;
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tracknum = _MIDI_NumTracks;
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_MIDI_ActiveTracks = 0;
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}
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else
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{
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trackptr = Track;
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tracknum = 1;
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_MIDI_ActiveTracks--;
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}
|
|
|
|
while (tracknum > 0)
|
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{
|
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if (trackptr->context[ 0 ].loopcount != EMIDI_INFINITE)
|
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{
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trackptr->context[ 0 ].loopcount--;
|
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}
|
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|
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trackptr->pos = trackptr->context[ 0 ].loopstart;
|
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trackptr->RunningStatus = trackptr->context[ 0 ].RunningStatus;
|
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trackptr->delay = trackptr->context[ 0 ].delay;
|
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trackptr->active = trackptr->context[ 0 ].active;
|
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if (trackptr->active)
|
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{
|
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_MIDI_ActiveTracks++;
|
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}
|
|
|
|
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)
|
|
{
|
|
int32_t event;
|
|
int32_t channel;
|
|
int32_t command;
|
|
track *Track;
|
|
int32_t tracknum;
|
|
int32_t status;
|
|
int32_t c1 = 0;
|
|
int32_t c2 = 0;
|
|
int32_t TimeSet = FALSE;
|
|
|
|
if (_MIDI_SongActive)
|
|
{
|
|
Track = _MIDI_TrackPtr;
|
|
tracknum = 0;
|
|
while (tracknum < _MIDI_NumTracks)
|
|
{
|
|
while ((Track->active) && (Track->delay == 0))
|
|
{
|
|
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--;
|
|
}
|
|
|
|
channel = GET_MIDI_CHANNEL(event);
|
|
command = GET_MIDI_COMMAND(event);
|
|
|
|
if (_MIDI_CommandLengths[ command ] > 0)
|
|
{
|
|
GET_NEXT_EVENT(Track, c1);
|
|
if (_MIDI_CommandLengths[ command ] > 1)
|
|
{
|
|
GET_NEXT_EVENT(Track, c2);
|
|
}
|
|
}
|
|
|
|
if (_MIDI_RerouteFunctions[ channel ] != NULL)
|
|
{
|
|
status = _MIDI_RerouteFunctions[ channel ](event, c1, c2);
|
|
|
|
if (status == MIDI_DONT_PLAY)
|
|
{
|
|
Track->delay = _MIDI_ReadDelta(Track);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: _MIDI_SendControlChange
|
|
|
|
Sends a control change to the proper device
|
|
---------------------------------------------------------------------*/
|
|
|
|
static int32_t _MIDI_SendControlChange
|
|
(
|
|
int32_t channel,
|
|
int32_t c1,
|
|
int32_t c2
|
|
)
|
|
|
|
{
|
|
int32_t status;
|
|
|
|
if (_MIDI_RerouteFunctions[ channel ] != NULL)
|
|
{
|
|
status = _MIDI_RerouteFunctions[ channel ](0xB0 + channel,
|
|
c1, c2);
|
|
if (status == MIDI_DONT_PLAY)
|
|
{
|
|
return(MIDI_Ok);
|
|
}
|
|
}
|
|
|
|
if (_MIDI_Funcs == NULL)
|
|
{
|
|
return(MIDI_Error);
|
|
}
|
|
|
|
if (_MIDI_Funcs->ControlChange == NULL)
|
|
{
|
|
return(MIDI_Error);
|
|
}
|
|
|
|
_MIDI_Funcs->ControlChange(channel, c1, c2);
|
|
|
|
return(MIDI_Ok);
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_RerouteMidiChannel
|
|
|
|
Sets callback function to reroute MIDI commands from specified
|
|
function.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_RerouteMidiChannel
|
|
(
|
|
int32_t channel,
|
|
int32_t(*function)(int32_t, int32_t, int32_t)
|
|
)
|
|
|
|
{
|
|
if ((channel >= 1) && (channel <= 16))
|
|
{
|
|
_MIDI_RerouteFunctions[ channel - 1 ] = function;
|
|
}
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_AllNotesOff
|
|
|
|
Sends all notes off commands on all midi channels.
|
|
---------------------------------------------------------------------*/
|
|
|
|
int32_t MIDI_AllNotesOff
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
int32_t channel;
|
|
|
|
for (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);
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: _MIDI_SetChannelVolume
|
|
|
|
Sets the volume of the specified midi channel.
|
|
---------------------------------------------------------------------*/
|
|
|
|
static void _MIDI_SetChannelVolume
|
|
(
|
|
int32_t channel,
|
|
int32_t volume
|
|
)
|
|
|
|
{
|
|
int32_t status;
|
|
int32_t remotevolume;
|
|
|
|
_MIDI_ChannelVolume[ channel ] = volume;
|
|
|
|
if (_MIDI_RerouteFunctions[ channel ] != NULL)
|
|
{
|
|
remotevolume = volume * _MIDI_TotalVolume;
|
|
remotevolume *= _MIDI_UserChannelVolume[ channel ];
|
|
remotevolume = tabledivide32_noinline(remotevolume, MIDI_MaxVolume);
|
|
remotevolume >>= 8;
|
|
|
|
status = _MIDI_RerouteFunctions[ channel ](0xB0 + channel,
|
|
MIDI_VOLUME, remotevolume);
|
|
if (status == MIDI_DONT_PLAY)
|
|
{
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (_MIDI_Funcs == NULL)
|
|
{
|
|
return;
|
|
}
|
|
|
|
if (_MIDI_Funcs->ControlChange == NULL)
|
|
{
|
|
return;
|
|
}
|
|
|
|
// For user volume
|
|
volume *= _MIDI_UserChannelVolume[ channel ];
|
|
|
|
if (_MIDI_Funcs->SetVolume == NULL)
|
|
{
|
|
volume *= _MIDI_TotalVolume;
|
|
volume = tabledivide32_noinline(volume, MIDI_MaxVolume);
|
|
}
|
|
|
|
// For user volume
|
|
volume >>= 8;
|
|
|
|
_MIDI_Funcs->ControlChange(channel, MIDI_VOLUME, volume);
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_SetUserChannelVolume
|
|
|
|
Sets the volume of the specified midi channel.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_SetUserChannelVolume
|
|
(
|
|
int32_t channel,
|
|
int32_t volume
|
|
)
|
|
|
|
{
|
|
// Convert channel from 1-16 to 0-15
|
|
channel--;
|
|
|
|
volume = max(0, volume);
|
|
volume = min(volume, 256);
|
|
|
|
if ((channel >= 0) && (channel < NUM_MIDI_CHANNELS))
|
|
{
|
|
_MIDI_UserChannelVolume[ channel ] = volume;
|
|
_MIDI_SetChannelVolume(channel, _MIDI_ChannelVolume[ channel ]);
|
|
}
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_ResetUserChannelVolume
|
|
|
|
Sets the volume of the specified midi channel.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_ResetUserChannelVolume
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
int32_t channel;
|
|
|
|
for (channel = 0; channel < NUM_MIDI_CHANNELS; channel++)
|
|
{
|
|
_MIDI_UserChannelVolume[ channel ] = 256;
|
|
}
|
|
|
|
_MIDI_SendChannelVolumes();
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: _MIDI_SendChannelVolumes
|
|
|
|
Sets the volume on all the midi channels.
|
|
---------------------------------------------------------------------*/
|
|
|
|
static void _MIDI_SendChannelVolumes
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
int32_t channel;
|
|
|
|
for (channel = 0; channel < NUM_MIDI_CHANNELS; channel++)
|
|
{
|
|
_MIDI_SetChannelVolume(channel, _MIDI_ChannelVolume[ channel ]);
|
|
}
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_Reset
|
|
|
|
Resets the MIDI device to General Midi defaults.
|
|
---------------------------------------------------------------------*/
|
|
|
|
int32_t MIDI_Reset
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
int32_t channel;
|
|
|
|
MIDI_AllNotesOff();
|
|
|
|
for (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
|
|
)
|
|
|
|
{
|
|
int32_t i;
|
|
|
|
if (_MIDI_Funcs == NULL)
|
|
{
|
|
return(MIDI_NullMidiModule);
|
|
}
|
|
|
|
volume = min(MIDI_MaxVolume, volume);
|
|
volume = max(0, volume);
|
|
|
|
_MIDI_TotalVolume = volume;
|
|
|
|
if (_MIDI_Funcs->SetVolume)
|
|
{
|
|
_MIDI_Funcs->SetVolume(volume);
|
|
|
|
for (i = 0; i < NUM_MIDI_CHANNELS; i++)
|
|
{
|
|
if (_MIDI_RerouteFunctions[ i ] != NULL)
|
|
{
|
|
_MIDI_SetChannelVolume(i, _MIDI_ChannelVolume[ i ]);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
_MIDI_SendChannelVolumes();
|
|
}
|
|
|
|
return(MIDI_Ok);
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_GetVolume
|
|
|
|
Returns the total volume of the music.
|
|
---------------------------------------------------------------------*/
|
|
|
|
int32_t MIDI_GetVolume
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
int32_t volume;
|
|
|
|
if (_MIDI_Funcs == NULL)
|
|
{
|
|
return(MIDI_NullMidiModule);
|
|
}
|
|
|
|
if (_MIDI_Funcs->GetVolume)
|
|
{
|
|
volume = _MIDI_Funcs->GetVolume();
|
|
}
|
|
else
|
|
{
|
|
volume = _MIDI_TotalVolume;
|
|
}
|
|
|
|
return(volume);
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_SetContext
|
|
|
|
Sets the song context.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_SetContext
|
|
(
|
|
int32_t context
|
|
)
|
|
|
|
{
|
|
if ((context > 0) && (context < EMIDI_NUM_CONTEXTS))
|
|
{
|
|
_MIDI_Context = context;
|
|
}
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_GetContext
|
|
|
|
Returns the current song context.
|
|
---------------------------------------------------------------------*/
|
|
|
|
int32_t MIDI_GetContext
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
return _MIDI_Context;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_SetLoopFlag
|
|
|
|
Sets whether the song should loop when finished or not.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_SetLoopFlag
|
|
(
|
|
int32_t loopflag
|
|
)
|
|
|
|
{
|
|
_MIDI_Loop = loopflag;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_ContinueSong
|
|
|
|
Continues playback of a paused song.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_ContinueSong
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
if (_MIDI_SongLoaded)
|
|
{
|
|
_MIDI_SongActive = TRUE;
|
|
MPU_Unpause();
|
|
}
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_PauseSong
|
|
|
|
Pauses playback of the current song.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_PauseSong
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
if (_MIDI_SongLoaded)
|
|
{
|
|
_MIDI_SongActive = FALSE;
|
|
MIDI_AllNotesOff();
|
|
MPU_Pause();
|
|
}
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_SongPlaying
|
|
|
|
Returns whether a song is playing or not.
|
|
---------------------------------------------------------------------*/
|
|
|
|
int32_t MIDI_SongPlaying
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
return(_MIDI_SongActive);
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_SetMidiFuncs
|
|
|
|
Selects the routines that send the MIDI data to the music device.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_SetMidiFuncs
|
|
(
|
|
midifuncs *funcs
|
|
)
|
|
|
|
{
|
|
_MIDI_Funcs = funcs;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_StopSong
|
|
|
|
Stops playback of the currently playing song.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_StopSong
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
if (_MIDI_SongLoaded)
|
|
{
|
|
_MIDI_SongActive = FALSE;
|
|
_MIDI_SongLoaded = FALSE;
|
|
|
|
MIDI_Reset();
|
|
_MIDI_ResetTracks();
|
|
|
|
if (_MIDI_Funcs->ReleasePatches)
|
|
{
|
|
_MIDI_Funcs->ReleasePatches();
|
|
}
|
|
|
|
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();
|
|
}
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_PlaySong
|
|
|
|
Begins playback of a MIDI song.
|
|
---------------------------------------------------------------------*/
|
|
|
|
int32_t MIDI_PlaySong
|
|
(
|
|
char *song,
|
|
int32_t loopflag
|
|
)
|
|
|
|
{
|
|
int32_t numtracks;
|
|
int32_t format;
|
|
int32_t headersize;
|
|
int32_t tracklength;
|
|
track *CurrentTrack;
|
|
char *ptr;
|
|
|
|
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 += 4;
|
|
|
|
headersize = _MIDI_ReadNumber(song, 4);
|
|
song += 4;
|
|
format = _MIDI_ReadNumber(song, 2);
|
|
_MIDI_NumTracks = _MIDI_ReadNumber(song + 2, 2);
|
|
_MIDI_Division = _MIDI_ReadNumber(song + 4, 2);
|
|
if (_MIDI_Division < 0)
|
|
{
|
|
// If a SMPTE time division is given, just set to 96 so no errors occur
|
|
_MIDI_Division = 96;
|
|
}
|
|
|
|
if (format > MAX_FORMAT)
|
|
{
|
|
return(MIDI_UnknownMidiFormat);
|
|
}
|
|
|
|
ptr = song + headersize;
|
|
|
|
if (_MIDI_NumTracks == 0)
|
|
{
|
|
return(MIDI_NoTracks);
|
|
}
|
|
|
|
_MIDI_TrackMemSize = _MIDI_NumTracks * sizeof(track);
|
|
_MIDI_TrackPtr = (track *)Xmalloc(_MIDI_TrackMemSize);
|
|
|
|
CurrentTrack = _MIDI_TrackPtr;
|
|
numtracks = _MIDI_NumTracks;
|
|
while (numtracks--)
|
|
{
|
|
if (B_UNBUF32(ptr) != MIDI_TRACK_SIGNATURE)
|
|
{
|
|
DO_FREE_AND_NULL(_MIDI_TrackPtr);
|
|
|
|
_MIDI_TrackMemSize = 0;
|
|
|
|
return(MIDI_InvalidTrack);
|
|
}
|
|
|
|
tracklength = _MIDI_ReadNumber(ptr + 4, 4);
|
|
ptr += 8;
|
|
CurrentTrack->start = ptr;
|
|
ptr += tracklength;
|
|
CurrentTrack++;
|
|
}
|
|
|
|
if (_MIDI_Funcs->GetVolume != NULL)
|
|
{
|
|
_MIDI_TotalVolume = _MIDI_Funcs->GetVolume();
|
|
}
|
|
|
|
_MIDI_InitEMIDI();
|
|
|
|
if (_MIDI_Funcs->LoadPatch)
|
|
{
|
|
MIDI_LoadTimbres();
|
|
}
|
|
|
|
_MIDI_ResetTracks();
|
|
|
|
if (!Reset)
|
|
{
|
|
MIDI_Reset();
|
|
}
|
|
|
|
Reset = FALSE;
|
|
|
|
MIDI_SetDivision(_MIDI_Division);
|
|
//MIDI_SetTempo( 120 );
|
|
|
|
_MIDI_SongLoaded = TRUE;
|
|
_MIDI_SongActive = TRUE;
|
|
|
|
while (_MPU_BuffersWaiting < 4) _MIDI_ServiceRoutine();
|
|
MPU_BeginPlayback();
|
|
|
|
return(MIDI_Ok);
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_SetTempo
|
|
|
|
Sets the song tempo.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_SetTempo
|
|
(
|
|
int32_t tempo
|
|
)
|
|
|
|
{
|
|
int32_t tickspersecond;
|
|
|
|
MIDI_Tempo = tempo;
|
|
tickspersecond = ((tempo) * _MIDI_Division)/60;
|
|
_MIDI_FPSecondsPerTick = tabledivide32_noinline(1 << TIME_PRECISION, tickspersecond);
|
|
MPU_SetTempo(tempo);
|
|
}
|
|
|
|
void MIDI_SetDivision(int32_t division)
|
|
{
|
|
MPU_SetDivision(division);
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_GetTempo
|
|
|
|
Returns the song tempo.
|
|
---------------------------------------------------------------------*/
|
|
|
|
int32_t MIDI_GetTempo
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
return(MIDI_Tempo);
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: _MIDI_ProcessNextTick
|
|
|
|
Sets the position of the song pointer.
|
|
---------------------------------------------------------------------*/
|
|
|
|
static int32_t _MIDI_ProcessNextTick
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
int32_t event;
|
|
int32_t channel;
|
|
int32_t command;
|
|
track *Track;
|
|
int32_t tracknum;
|
|
int32_t status;
|
|
int32_t c1 = 0;
|
|
int32_t c2 = 0;
|
|
int32_t TimeSet = FALSE;
|
|
|
|
Track = _MIDI_TrackPtr;
|
|
tracknum = 0;
|
|
while ((tracknum < _MIDI_NumTracks) && (Track != NULL))
|
|
{
|
|
while ((Track->active) && (Track->delay == 0))
|
|
{
|
|
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--;
|
|
}
|
|
|
|
channel = GET_MIDI_CHANNEL(event);
|
|
command = GET_MIDI_COMMAND(event);
|
|
|
|
if (_MIDI_CommandLengths[ command ] > 0)
|
|
{
|
|
GET_NEXT_EVENT(Track, c1);
|
|
if (_MIDI_CommandLengths[ command ] > 1)
|
|
{
|
|
GET_NEXT_EVENT(Track, c2);
|
|
}
|
|
}
|
|
|
|
if (_MIDI_RerouteFunctions[ channel ] != NULL)
|
|
{
|
|
status = _MIDI_RerouteFunctions[ channel ](event, c1, c2);
|
|
|
|
if (status == MIDI_DONT_PLAY)
|
|
{
|
|
Track->delay = _MIDI_ReadDelta(Track);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
switch (command)
|
|
{
|
|
case MIDI_NOTE_OFF :
|
|
break;
|
|
|
|
case MIDI_NOTE_ON :
|
|
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, c1);
|
|
}
|
|
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)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
_MIDI_AdvanceTick();
|
|
|
|
return(TimeSet);
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_SetSongTick
|
|
|
|
Sets the position of the song pointer.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_SetSongTick
|
|
(
|
|
uint32_t PositionInTicks
|
|
)
|
|
|
|
{
|
|
if (!_MIDI_SongLoaded)
|
|
{
|
|
return;
|
|
}
|
|
|
|
MIDI_PauseSong();
|
|
|
|
if (PositionInTicks < _MIDI_PositionInTicks)
|
|
{
|
|
_MIDI_ResetTracks();
|
|
MIDI_Reset();
|
|
}
|
|
|
|
while (_MIDI_PositionInTicks < PositionInTicks)
|
|
{
|
|
if (_MIDI_ProcessNextTick())
|
|
{
|
|
break;
|
|
}
|
|
if (_MIDI_ActiveTracks == 0)
|
|
{
|
|
_MIDI_ResetTracks();
|
|
if (!_MIDI_Loop)
|
|
{
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
MIDI_SetVolume(_MIDI_TotalVolume);
|
|
MIDI_ContinueSong();
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_SetSongTime
|
|
|
|
Sets the position of the song pointer.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_SetSongTime
|
|
(
|
|
uint32_t milliseconds
|
|
)
|
|
|
|
{
|
|
uint32_t mil;
|
|
uint32_t sec;
|
|
uint32_t newtime;
|
|
|
|
if (!_MIDI_SongLoaded)
|
|
{
|
|
return;
|
|
}
|
|
|
|
MIDI_PauseSong();
|
|
|
|
mil = tabledivide32_noinline((milliseconds % 1000) << TIME_PRECISION, 1000);
|
|
sec = tabledivide32_noinline(milliseconds, 1000) << TIME_PRECISION;
|
|
newtime = sec + mil;
|
|
|
|
if (newtime < _MIDI_Time)
|
|
{
|
|
_MIDI_ResetTracks();
|
|
MIDI_Reset();
|
|
}
|
|
|
|
while (_MIDI_Time < newtime)
|
|
{
|
|
if (_MIDI_ProcessNextTick())
|
|
{
|
|
break;
|
|
}
|
|
if (_MIDI_ActiveTracks == 0)
|
|
{
|
|
_MIDI_ResetTracks();
|
|
if (!_MIDI_Loop)
|
|
{
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
MIDI_SetVolume(_MIDI_TotalVolume);
|
|
MIDI_ContinueSong();
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_SetSongPosition
|
|
|
|
Sets the position of the song pointer.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_SetSongPosition
|
|
(
|
|
int32_t measure,
|
|
int32_t beat,
|
|
int32_t tick
|
|
)
|
|
|
|
{
|
|
uint32_t pos;
|
|
|
|
if (!_MIDI_SongLoaded)
|
|
{
|
|
return;
|
|
}
|
|
|
|
MIDI_PauseSong();
|
|
|
|
pos = RELATIVE_BEAT(measure, beat, tick);
|
|
|
|
if (pos < (uint32_t)RELATIVE_BEAT(_MIDI_Measure, _MIDI_Beat, _MIDI_Tick))
|
|
{
|
|
_MIDI_ResetTracks();
|
|
MIDI_Reset();
|
|
}
|
|
|
|
while ((uint32_t)RELATIVE_BEAT(_MIDI_Measure, _MIDI_Beat, _MIDI_Tick) < pos)
|
|
{
|
|
if (_MIDI_ProcessNextTick())
|
|
{
|
|
break;
|
|
}
|
|
if (_MIDI_ActiveTracks == 0)
|
|
{
|
|
_MIDI_ResetTracks();
|
|
if (!_MIDI_Loop)
|
|
{
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
MIDI_SetVolume(_MIDI_TotalVolume);
|
|
MIDI_ContinueSong();
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_GetSongPosition
|
|
|
|
Returns the position of the song pointer in Measures, beats, ticks.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_GetSongPosition
|
|
(
|
|
songposition *pos
|
|
)
|
|
|
|
{
|
|
uint32_t mil;
|
|
uint32_t sec;
|
|
|
|
mil = (_MIDI_Time & ((1 << TIME_PRECISION) - 1)) * 1000;
|
|
sec = _MIDI_Time >> TIME_PRECISION;
|
|
pos->milliseconds = (mil >> TIME_PRECISION) + (sec * 1000);
|
|
pos->tickposition = _MIDI_PositionInTicks;
|
|
pos->measure = _MIDI_Measure;
|
|
pos->beat = _MIDI_Beat;
|
|
pos->tick = _MIDI_Tick;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_GetSongLength
|
|
|
|
Returns the length of the song.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_GetSongLength
|
|
(
|
|
songposition *pos
|
|
)
|
|
|
|
{
|
|
uint32_t mil;
|
|
uint32_t sec;
|
|
|
|
mil = (_MIDI_TotalTime & ((1 << TIME_PRECISION) - 1)) * 1000;
|
|
sec = _MIDI_TotalTime >> TIME_PRECISION;
|
|
|
|
pos->milliseconds = (mil >> TIME_PRECISION) + (sec * 1000);
|
|
pos->measure = _MIDI_TotalMeasures;
|
|
pos->beat = _MIDI_TotalBeats;
|
|
pos->tick = _MIDI_TotalTicks;
|
|
pos->tickposition = 0;
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_InitEMIDI
|
|
|
|
Sets up the EMIDI
|
|
---------------------------------------------------------------------*/
|
|
|
|
static void _MIDI_InitEMIDI
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
int32_t event;
|
|
int32_t command;
|
|
// int32_t channel;
|
|
int32_t length;
|
|
int32_t IncludeFound;
|
|
track *Track;
|
|
int32_t tracknum;
|
|
int32_t type;
|
|
int32_t c1;
|
|
int32_t c2;
|
|
|
|
type = EMIDI_GeneralMIDI;
|
|
|
|
_MIDI_ResetTracks();
|
|
|
|
_MIDI_TotalTime = 0;
|
|
_MIDI_TotalTicks = 0;
|
|
_MIDI_TotalBeats = 0;
|
|
_MIDI_TotalMeasures = 0;
|
|
|
|
Track = _MIDI_TrackPtr;
|
|
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--;
|
|
}
|
|
|
|
IncludeFound = FALSE;
|
|
while (Track->active)
|
|
{
|
|
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--;
|
|
}
|
|
|
|
// channel = GET_MIDI_CHANNEL(event);
|
|
command = GET_MIDI_COMMAND(event);
|
|
length = _MIDI_CommandLengths[ command ];
|
|
|
|
if (command == MIDI_CONTROL_CHANGE)
|
|
{
|
|
if (*Track->pos == MIDI_MONO_MODE_ON)
|
|
{
|
|
length++;
|
|
}
|
|
GET_NEXT_EVENT(Track, c1);
|
|
GET_NEXT_EVENT(Track, c2);
|
|
length -= 2;
|
|
|
|
switch (c1)
|
|
{
|
|
case EMIDI_LOOP_START :
|
|
case EMIDI_SONG_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;
|
|
|
|
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();
|
|
}
|
|
|
|
|
|
/*---------------------------------------------------------------------
|
|
Function: MIDI_LoadTimbres
|
|
|
|
Preloads the timbres on cards that use patch-caching.
|
|
---------------------------------------------------------------------*/
|
|
|
|
void MIDI_LoadTimbres
|
|
(
|
|
void
|
|
)
|
|
|
|
{
|
|
int32_t event;
|
|
int32_t command;
|
|
int32_t channel;
|
|
int32_t length;
|
|
int32_t Finished;
|
|
track *Track;
|
|
int32_t tracknum;
|
|
|
|
Track = _MIDI_TrackPtr;
|
|
tracknum = 0;
|
|
while ((tracknum < _MIDI_NumTracks) && (Track != NULL))
|
|
{
|
|
Finished = FALSE;
|
|
while (!Finished)
|
|
{
|
|
GET_NEXT_EVENT(Track, event);
|
|
|
|
if (GET_MIDI_COMMAND(event) == MIDI_SPECIAL)
|
|
{
|
|
switch (event)
|
|
{
|
|
case MIDI_SYSEX :
|
|
case MIDI_SYSEX_CONTINUE :
|
|
length = _MIDI_ReadDelta(Track);
|
|
Track->pos += length;
|
|
break;
|
|
|
|
case MIDI_META_EVENT :
|
|
GET_NEXT_EVENT(Track, command);
|
|
GET_NEXT_EVENT(Track, length);
|
|
|
|
if (command == MIDI_END_OF_TRACK)
|
|
{
|
|
Finished = TRUE;
|
|
}
|
|
|
|
Track->pos += length;
|
|
break;
|
|
}
|
|
|
|
if (!Finished)
|
|
{
|
|
_MIDI_ReadDelta(Track);
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
if (event & MIDI_RUNNING_STATUS)
|
|
{
|
|
Track->RunningStatus = event;
|
|
}
|
|
else
|
|
{
|
|
event = Track->RunningStatus;
|
|
Track->pos--;
|
|
}
|
|
|
|
channel = GET_MIDI_CHANNEL(event);
|
|
command = GET_MIDI_COMMAND(event);
|
|
length = _MIDI_CommandLengths[ command ];
|
|
|
|
if (command == MIDI_CONTROL_CHANGE)
|
|
{
|
|
if (*Track->pos == MIDI_MONO_MODE_ON)
|
|
{
|
|
length++;
|
|
}
|
|
|
|
if (*Track->pos == EMIDI_PROGRAM_CHANGE)
|
|
{
|
|
_MIDI_Funcs->LoadPatch(*(Track->pos + 1));
|
|
}
|
|
}
|
|
|
|
if (channel == MIDI_RHYTHM_CHANNEL)
|
|
{
|
|
if (command == MIDI_NOTE_ON)
|
|
{
|
|
_MIDI_Funcs->LoadPatch(128 + *Track->pos);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (command == MIDI_PROGRAM_CHANGE)
|
|
{
|
|
_MIDI_Funcs->LoadPatch(*Track->pos);
|
|
}
|
|
}
|
|
Track->pos += length;
|
|
_MIDI_ReadDelta(Track);
|
|
}
|
|
Track++;
|
|
tracknum++;
|
|
}
|
|
|
|
_MIDI_ResetTracks();
|
|
}
|
|
|
|
|
|
void MIDI_UpdateMusic(void)
|
|
{
|
|
if (!_MIDI_SongLoaded || !_MIDI_SongActive) return;
|
|
while (_MPU_BuffersWaiting < 4) _MIDI_ServiceRoutine();
|
|
}
|
|
|