apps/plugins/midi/midiutil.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 Stepan Moskovchenko
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #define FRACTSIZE 12
  23
  24 #define BUF_SIZE 16384 /* 64 kB output buffers */
  25 #define NBUF   2
  26
  27 #ifndef SIMULATOR
  28
  29 #if (HW_SAMPR_CAPS & SAMPR_CAP_22)  /* use 22050Hz if we can */
  30 #define SAMPLE_RATE SAMPR_22        /* 22050 */
  31 #else
  32 #define SAMPLE_RATE SAMPR_44        /* 44100 */
  33 #endif
  34
  35 /* Some of the pp based targets can't handle too many voices
  36    mainly because they have to use 44100Hz sample rate, this could be
  37    improved to increase MAX_VOICES for targets that can do 22kHz */
  38 #ifdef CPU_PP
  39 #define MAX_VOICES 16
  40 #else
  41 #define MAX_VOICES 24 /* Note: 24 midi channels is the minimum general midi spec implementation */
  42 #endif /* CPU_PP */
  43
  44 #else   /* Simulator requires 44100Hz, and we can afford to use more voices */
  45
  46 #define SAMPLE_RATE SAMPR_44
  47 #define MAX_VOICES 48
  48
  49 #endif
  50
  51 #define BYTE unsigned char
  52
  53 /* Data chunk ID types, returned by readID() */
  54 #define ID_UNKNOWN  -1
  55 #define ID_MTHD     1
  56 #define ID_MTRK     2
  57 #define ID_EOF      3
  58 #define ID_RIFF     4
  59
  60 /* MIDI Commands */
  61 #define MIDI_NOTE_OFF   128
  62 #define MIDI_NOTE_ON    144
  63 #define MIDI_AFTERTOUCH 160
  64 #define MIDI_CONTROL    176
  65 #define MIDI_PRGM   192
  66 #define MIDI_PITCHW 224
  67
  68 /* MIDI Controllers */
  69 #define CTRL_DATAENT_MSB    6
  70 #define CTRL_VOLUME     7
  71 #define CTRL_BALANCE    8
  72 #define CTRL_PANNING    10
  73 #define CTRL_NONREG_LSB 98
  74 #define CTRL_NONREG_MSB 99
  75 #define CTRL_REG_LSB    100
  76 #define CTRL_REG_MSB    101
  77
  78 #define REG_PITCHBEND_MSB 0
  79 #define REG_PITCHBEND_LSB 0
  80
  81
  82 #define CHANNEL     1
  83
  84 /* Most of these are deprecated.. rampdown is used, maybe one other one too */
  85 #define STATE_ATTACK        1
  86 #define STATE_DECAY         2
  87 #define STATE_SUSTAIN       3
  88 #define STATE_RELEASE       4
  89 #define STATE_RAMPDOWN      5
  90
  91 /* Loop states */
  92 #define STATE_LOOPING           7
  93 #define STATE_NONLOOPING    8
  94
  95 /* Various bits in the GUS mode byte */
  96 #define LOOP_ENABLED    4
  97 #define LOOP_PINGPONG   8
  98 #define LOOP_REVERSE    16
  99
 100 struct MIDIfile
 101 {
 102     int  Length;
 103     unsigned short numTracks;
 104     unsigned short div; /* Time division, X ticks per millisecond */
 105     struct Track * tracks[48];
 106     unsigned char patches[128];
 107     int numPatches;
 108 };
 109
 110 struct SynthObject
 111 {
 112     struct GWaveform * wf;
 113     int delta;
 114     int decay;
 115     unsigned int cp; /* unsigned int */
 116     int state, loopState;
 117     int note, vol, ch;
 118     int curRate, curOffset, targetOffset;
 119     int curPoint;
 120     signed short int volscale;
 121     bool isUsed;
 122 };
 123
 124 struct Event
 125 {
 126     unsigned int delta;
 127     unsigned char status, d1, d2;
 128     unsigned int len;
 129     unsigned char * evData;
 130 };
 131
 132 struct Track
 133 {
 134     unsigned int size;
 135     unsigned int numEvents;
 136     unsigned int delta; /* For sequencing */
 137     unsigned int pos;   /* For sequencing */
 138     void * dataBlock;
 139 };
 140
 141 int printf(const char *fmt, ...);
 142 unsigned char readChar(int file);
 143 int readTwoBytes(int file);
 144 int readFourBytes(int file);
 145 int readVarData(int file);
 146 int eof(int fd);
 147 unsigned char * readData(int file, int len);
 148 void exit(int code);
 149
 150 #define malloc(n) my_malloc(n)
 151 void * my_malloc(int size);
 152
 153 extern struct SynthObject voices[MAX_VOICES];
 154
 155 extern int chVol[16];       /* Channel volume                */
 156 extern int chPan[16];       /* Channel panning               */
 157 extern int chPat[16];       /* Channel patch                 */
 158 extern int chPW[16];        /* Channel pitch wheel, MSB only */
 159 extern int chPBDepth[16];   /* Channel pitch bend depth (Controller 6 */
 160 extern int chPBNoteOffset[16] IBSS_ATTR;       /* Pre-computed whole semitone offset */
 161 extern int chPBFractBend[16] IBSS_ATTR;        /* Fractional bend applied to delta */
 162 extern unsigned char chLastCtrlMSB[16]; /* MIDI regs, used for Controller 6. */
 163 extern unsigned char chLastCtrlLSB[16]; /* The non-registered ones are ignored */
 164
 165 extern struct GPatch * gusload(char *);
 166 extern struct GPatch * patchSet[128];
 167 extern struct GPatch * drumSet[128];
 168
 169 extern struct MIDIfile * mf;
 170
 171 extern int number_of_samples;
 172 extern int playing_time IBSS_ATTR;
 173 extern int samples_this_second IBSS_ATTR;
 174 extern long bpm;
 175