1  /*
  2  Copyright (C) 1994-1995 Apogee Software, Ltd.
  3  
  4  This program is free software; you can redistribute it and/or
  5  modify it under the terms of the GNU General Public License
  6  as published by the Free Software Foundation; either version 2
  7  of the License, or (at your option) any later version.
  8  
  9  This program is distributed in the hope that it will be useful,
 10  but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 12  
 13  See the GNU General Public License for more details.
 14  
 15  You should have received a copy of the GNU General Public License
 16  along with this program; if not, write to the Free Software
 17  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 18  
 19  */
 20  #ifndef ___AL_MIDI_H
 21  #define ___AL_MIDI_H
 22  
 23  #include <inttypes.h>
 24  #include "_midi.h"
 25  
 26  #define lobyte(num) ((uint32_t)*((char *)&(num)))
 27  #define hibyte(num) ((uint32_t)*(((char *)&(num)) + 1))
 28  
 29  #define AL_MaxVolume             127
 30  #define AL_DefaultChannelVolume  90
 31  #define AL_DefaultPitchBendRange 200
 32  #define AL_VoiceNotFound -1
 33  
 34  #define ADLIB_PORT 0x388
 35  
 36  /* Number of slots for the voices on the chip */
 37  #define AL_NumChipSlots 18
 38  
 39  #define NUMADLIBVOICES 9
 40  #define NUMADLIBCHANNELS 16
 41  
 42  #define NOTE_ON  0x2000 /* Used to turn note on or toggle note */
 43  #define NOTE_OFF 0x0000
 44  
 45  #define MAX_VELOCITY 0x7f
 46  #define MAX_OCTAVE 7
 47  #define MAX_NOTE (MAX_OCTAVE * 12 + 11)
 48  #define FINETUNE_MAX 31
 49  #define FINETUNE_RANGE (FINETUNE_MAX + 1)
 50  
 51  #define PITCHBEND_CENTER 1638400
 52  
 53  typedef struct AdLibVoice
 54  {
 55      struct AdLibVoice *next;
 56      struct AdLibVoice *prev;
 57  
 58      uint32_t num;
 59      uint32_t key;
 60      uint32_t velocity;
 61      uint32_t channel;
 62      uint32_t pitchleft;
 63      uint32_t pitchright;
 64      int      timbre;
 65      int      port;
 66      uint32_t status;
 67  } AdLibVoice;
 68  
 69  typedef struct
 70  {
 71      AdLibVoice *start;
 72      AdLibVoice *end;
 73  } AdLibVoiceList;
 74  
 75  typedef struct
 76  {
 77      AdLibVoiceList Voices;
 78  
 79      int      Timbre;
 80      int      Pitchbend;
 81      int      KeyOffset;
 82      uint32_t KeyDetune;
 83      uint32_t Volume;
 84      uint32_t EffectiveVolume;
 85      int      Pan;
 86      int      Detune;
 87      uint32_t RPN;
 88      int16_t  PitchBendRange;
 89      int16_t  PitchBendSemiTones;
 90      int16_t  PitchBendHundreds;
 91  } AdLibChannel;
 92  
 93  static int  AL_Init(void);
 94  static void AL_NoteOff(int channel, int key, int velocity);
 95  static void AL_NoteOn(int channel, int key, int vel);
 96  static void AL_ControlChange(int channel, int type, int data);
 97  static void AL_ProgramChange(int channel, int patch);
 98  static void AL_SetPitchBend(int channel, int lsb, int msb);
 99  static void AL_SetVolume(int volume);
100  
101  #endif