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 #include "lib/pluginlib_exit.h"
  25
  26 #define BUF_SIZE 16384 /* 64 kB output buffers */
  27 #define NBUF   2
  28
  29 #ifndef SIMULATOR
  30
  31 #if (HW_SAMPR_CAPS & SAMPR_CAP_22)  /* use 22050Hz if we can */
  32 #define SAMPLE_RATE SAMPR_22        /* 22050 */
  33 #else
  34 #define SAMPLE_RATE SAMPR_44        /* 44100 */
  35 #endif
  36
  37 /* Some of the pp based targets can't handle too many voices
  38    mainly because they have to use 44100Hz sample rate, this could be
  39    improved to increase MAX_VOICES for targets that can do 22kHz */
  40 #ifdef CPU_PP
  41 #define MAX_VOICES 16
  42 #elif (CONFIG_PLATFORM & PLATFORM_HOSTED)
  43 #define MAX_VOICES 48
  44 #else
  45 #define MAX_VOICES 24 /* Note: 24 midi channels is the minimum general midi spec implementation */
  46 #endif /* CPU_PP */
  47
  48 #else   /* Simulator requires 44100Hz, and we can afford to use more voices */
  49
  50 #define SAMPLE_RATE SAMPR_44
  51 #define MAX_VOICES 48
  52
  53 #endif
  54
  55 #define BYTE unsigned char
  56
  57 /* Data chunk ID types, returned by readID() */
  58 #define ID_UNKNOWN  -1
  59 #define ID_MTHD     1
  60 #define ID_MTRK     2
  61 #define ID_EOF      3
  62 #define ID_RIFF     4
  63
  64 /* MIDI Commands */
  65 #define MIDI_NOTE_OFF   128
  66 #define MIDI_NOTE_ON    144
  67 #define MIDI_AFTERTOUCH 160
  68 #define MIDI_CONTROL    176
  69 #define MIDI_PRGM   192
  70 #define MIDI_PITCHW 224
  71
  72 /* MIDI Controllers */
  73 #define CTRL_DATAENT_MSB    6
  74 #define CTRL_VOLUME     7
  75 #define CTRL_BALANCE    8
  76 #define CTRL_PANNING    10
  77 #define CTRL_NONREG_LSB 98
  78 #define CTRL_NONREG_MSB 99
  79 #define CTRL_REG_LSB    100
  80 #define CTRL_REG_MSB    101
  81
  82 #define REG_PITCHBEND_MSB 0
  83 #define REG_PITCHBEND_LSB 0
  84
  85
  86 #define CHANNEL     1
  87
  88 /* Most of these are deprecated.. rampdown is used, maybe one other one too */
  89 #define STATE_ATTACK        1
  90 #define STATE_DECAY         2
  91 #define STATE_SUSTAIN       3
  92 #define STATE_RELEASE       4
  93 #define STATE_RAMPDOWN      5
  94
  95 /* Loop states */
  96 #define STATE_LOOPING           7
  97 #define STATE_NONLOOPING    8
  98
  99 /* Various bits in the GUS mode byte */
 100 #define LOOP_ENABLED    4
 101 #define LOOP_PINGPONG   8
 102 #define LOOP_REVERSE    16
 103
 104 struct MIDIfile
 105 {
 106     int  Length;
 107     unsigned short numTracks;
 108     unsigned short div; /* Time division, X ticks per millisecond */
 109     struct Track * tracks[48];
 110     unsigned char patches[128];
 111     int numPatches;
 112 };
 113
 114 struct SynthObject
 115 {
 116     struct GWaveform * wf;
 117     int delta;
 118     int decay;
 119     unsigned int cp; /* unsigned int */
 120     int state, loopState;
 121     int note, vol, ch;
 122     int curRate, curOffset, targetOffset;
 123     int curPoint;
 124     signed short int volscale;
 125     bool isUsed;
 126 };
 127
 128 struct Event
 129 {
 130     unsigned int delta;
 131     unsigned char status, d1, d2;
 132     unsigned int len;
 133     unsigned char * evData;
 134 };
 135
 136 struct Track
 137 {
 138     unsigned int size;
 139     unsigned int numEvents;
 140     unsigned int delta; /* For sequencing */
 141     unsigned int pos;   /* For sequencing */
 142     void * dataBlock;
 143 };
 144
 145 int midi_debug(const char *fmt, ...);
 146 unsigned char readChar(int file);
 147 int readTwoBytes(int file);
 148 int readFourBytes(int file);
 149 int readVarData(int file);
 150 int eof(int fd);
 151 unsigned char * readData(int file, int len);
 152
 153 #define malloc(n) my_malloc(n)
 154 void * my_malloc(int size);
 155
 156 extern struct SynthObject voices[MAX_VOICES];
 157
 158 extern int chVol[16];       /* Channel volume                */
 159 extern int chPan[16];       /* Channel panning               */
 160 extern int chPat[16];       /* Channel patch                 */
 161 extern int chPW[16];        /* Channel pitch wheel, MSB only */
 162 extern int chPBDepth[16];   /* Channel pitch bend depth (Controller 6 */
 163 extern int chPBNoteOffset[16] IBSS_ATTR;       /* Pre-computed whole semitone offset */
 164 extern int chPBFractBend[16] IBSS_ATTR;        /* Fractional bend applied to delta */
 165 extern unsigned char chLastCtrlMSB[16]; /* MIDI regs, used for Controller 6. */
 166 extern unsigned char chLastCtrlLSB[16]; /* The non-registered ones are ignored */
 167
 168 extern struct GPatch * gusload(char *);
 169 extern struct GPatch * patchSet[128];
 170 extern struct GPatch * drumSet[128];
 171
 172 extern struct MIDIfile * mf;
 173
 174 extern int number_of_samples;
 175 extern int playing_time IBSS_ATTR;
 176 extern int samples_this_second IBSS_ATTR;
 177 extern long bpm;
 178