[203] | 1 | //midi.c: |
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| 2 | |
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[687] | 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - August 2008 |
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| 5 | * |
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| 6 | * This file is part of libroardsp a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroardsp is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 22 | * |
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| 23 | */ |
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| 24 | |
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[686] | 25 | #include "libroardsp.h" |
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[203] | 26 | |
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[367] | 27 | struct { |
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| 28 | uint16_t id; |
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[1854] | 29 | unsigned char midiid; |
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[367] | 30 | float freq; |
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| 31 | char * name; |
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| 32 | } _libroar_notes[] = { |
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[1854] | 33 | {ROAR_MIDI_NOTE_C , 60, 261.625565, "C" }, |
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| 34 | {ROAR_MIDI_NOTE_Cs, 61, 277.182631, "C#"}, |
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| 35 | {ROAR_MIDI_NOTE_D , 62, 293.664768, "D" }, |
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| 36 | {ROAR_MIDI_NOTE_Ds, 63, 311.126984, "D#"}, |
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| 37 | {ROAR_MIDI_NOTE_E , 64, 329.627557, "E" }, |
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| 38 | {ROAR_MIDI_NOTE_F , 65, 349.228231, "F" }, |
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| 39 | {ROAR_MIDI_NOTE_Fs, 66, 369.994423, "F#"}, |
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| 40 | {ROAR_MIDI_NOTE_G , 67, 391.995436, "G" }, |
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| 41 | {ROAR_MIDI_NOTE_Gs, 68, 415.304698, "G#"}, |
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| 42 | {ROAR_MIDI_NOTE_A , 69, 440.000000, "A" }, |
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| 43 | {ROAR_MIDI_NOTE_As, 70, 466.163762, "A#"}, |
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| 44 | {ROAR_MIDI_NOTE_B , 71, 493.883301, "B" }, |
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| 45 | {0, 0, 0, NULL} |
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[367] | 46 | }; |
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| 47 | |
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| 48 | char * roar_midi_note2name (uint16_t note) { |
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| 49 | int i; |
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| 50 | |
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| 51 | for (i = 0; _libroar_notes[i].name != NULL; i++) |
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| 52 | if ( _libroar_notes[i].id == note ) |
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| 53 | return _libroar_notes[i].name; |
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| 54 | |
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| 55 | return NULL; |
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| 56 | } |
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| 57 | |
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| 58 | uint16_t roar_midi_name2note (char * note) { |
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| 59 | int i; |
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| 60 | |
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| 61 | for (i = 0; _libroar_notes[i].name != NULL; i++) |
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| 62 | if ( strcasecmp(_libroar_notes[i].name, note) == 0 ) |
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| 63 | return _libroar_notes[i].id; |
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| 64 | |
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| 65 | return ROAR_MIDI_NOTE_NONE; |
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| 66 | } |
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| 67 | |
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[1854] | 68 | uint16_t roar_midi_midi2note (unsigned char midiid) { |
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| 69 | int i; |
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| 70 | |
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| 71 | for (i = 0; _libroar_notes[i].name != NULL; i++) |
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| 72 | if ( _libroar_notes[i].midiid == midiid ) |
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| 73 | return _libroar_notes[i].id; |
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| 74 | |
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| 75 | return ROAR_MIDI_NOTE_NONE; |
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| 76 | } |
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| 77 | |
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[367] | 78 | float roar_midi_note2freq (uint16_t note) { |
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| 79 | int i; |
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| 80 | |
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| 81 | for (i = 0; _libroar_notes[i].name != NULL; i++) |
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| 82 | if ( _libroar_notes[i].id == note ) |
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| 83 | return _libroar_notes[i].freq; |
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| 84 | |
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| 85 | return -1; |
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| 86 | } |
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| 87 | |
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[1880] | 88 | int roar_midi_note_from_midiid(struct roar_note_octave * note, unsigned char midiid) { |
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| 89 | int oct; |
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| 90 | |
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| 91 | if ( note == NULL || midiid > 127 ) |
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| 92 | return -1; |
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| 93 | |
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| 94 | memset(note, 0, sizeof(struct roar_note_octave)); |
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| 95 | |
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| 96 | note->octave = ((int) midiid/12) - 5; |
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| 97 | note->note = roar_midi_midi2note((midiid % 12) + 60); |
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| 98 | |
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| 99 | oct = 1 << abs(note->octave); |
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| 100 | |
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| 101 | note->freq = roar_midi_note2freq(note->note); |
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| 102 | |
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| 103 | if ( note->octave < 0 ) { |
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| 104 | note->freq /= oct; |
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| 105 | } else { |
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| 106 | note->freq *= oct; |
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| 107 | } |
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| 108 | |
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| 109 | return 0; |
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| 110 | } |
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| 111 | |
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[367] | 112 | int roar_midi_find_octave (char * note); |
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| 113 | int roar_midi_add_octave (struct roar_note_octave * note) { |
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| 114 | note->name[0] = 0; |
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| 115 | return -1; |
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| 116 | } |
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| 117 | |
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| 118 | int roar_midi_notefill (struct roar_note_octave * note) { |
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| 119 | int oct; |
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| 120 | |
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| 121 | if ( !note ) |
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| 122 | return -1; |
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| 123 | |
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| 124 | if ( note->note && note->name[0] == 0 ) { |
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| 125 | roar_midi_add_octave(note); |
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| 126 | } else if ( !note->note && note->name[0] != 0 ) { |
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| 127 | return -1; |
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| 128 | } |
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| 129 | |
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| 130 | oct = 1 << abs(note->octave); |
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| 131 | |
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| 132 | note->freq = roar_midi_note2freq(note->note); |
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| 133 | |
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[1679] | 134 | // TODO: fix this: freq is freq*2^octave |
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[367] | 135 | if ( note->octave < 0 ) { |
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| 136 | note->freq /= oct; |
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| 137 | } else { |
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| 138 | note->freq *= oct; |
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| 139 | } |
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| 140 | |
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| 141 | return 0; |
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| 142 | } |
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| 143 | |
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| 144 | int roar_midi_gen_tone (struct roar_note_octave * note, int16_t * samples, float t, int rate, int channels, int type, void * opts) { |
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[1104] | 145 | #ifdef ROAR_HAVE_LIBM |
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[367] | 146 | int i, c; |
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| 147 | float ct; |
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[2424] | 148 | float step = 1.0/rate; |
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[367] | 149 | int16_t s; |
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[369] | 150 | float (*op)(float x) = NULL; |
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[367] | 151 | |
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| 152 | /* |
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| 153 | rate: 1/s |
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| 154 | t : 1s |
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| 155 | freq: 1/s |
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| 156 | rew : 1s |
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| 157 | */ |
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| 158 | |
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[369] | 159 | if ( type == ROAR_MIDI_TYPE_SINE ) { |
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| 160 | op = sinf; |
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| 161 | } else { |
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| 162 | return -1; |
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| 163 | } |
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| 164 | |
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| 165 | if ( op == NULL ) |
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| 166 | return -1; |
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| 167 | |
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[2424] | 168 | ROAR_DBG("roar_midi_gen_tone(*): t=%f", t); |
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| 169 | |
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[367] | 170 | for (ct = 0, i = 0; ct <= t; ct += step, i += channels) { |
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[2424] | 171 | s = 32767*op(2.0*M_PI*note->freq*ct); |
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| 172 | |
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| 173 | // ROAR_DBG("roar_midi_gen_tone(*): t=%f, ct=%f, i=%i", t, ct, i); |
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[367] | 174 | |
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| 175 | for (c = 0; c < channels; c++) |
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| 176 | samples[i+c] = s; |
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| 177 | } |
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| 178 | |
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[2424] | 179 | ROAR_DBG("roar_midi_gen_tone(*): t=%f, ct=%f, i=%i", t, ct, i); |
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| 180 | |
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[367] | 181 | return 0; |
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[1104] | 182 | #else |
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| 183 | return -1; |
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| 184 | #endif |
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[367] | 185 | } |
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| 186 | |
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[370] | 187 | |
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| 188 | int roar_midi_play_note (struct roar_stream * stream, struct roar_note_octave * note, float len) { |
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| 189 | return -1; |
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| 190 | } |
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| 191 | |
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| 192 | int roar_midi_basic_init (struct roar_midi_basic_state * state) { |
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| 193 | if (!state) |
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| 194 | return -1; |
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| 195 | |
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| 196 | state->len.mul = 1; |
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| 197 | state->len.div = 60; |
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| 198 | |
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| 199 | state->note.note = ROAR_MIDI_NOTE_NONE; |
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| 200 | state->note.octave = 0; |
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| 201 | |
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| 202 | return 0; |
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| 203 | } |
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| 204 | |
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| 205 | int roar_midi_basic_play (struct roar_stream * stream, struct roar_midi_basic_state * state, char * notes) { |
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| 206 | struct roar_midi_basic_state is; |
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| 207 | char cn[ROAR_MIDI_MAX_NOTENAME_LEN+1] = {0}; |
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| 208 | int i; |
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| 209 | int have = 0; |
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| 210 | struct roar_note_octave * n; |
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| 211 | |
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| 212 | if ( !notes ) |
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| 213 | return -1; |
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| 214 | |
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| 215 | if ( state == NULL ) { |
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| 216 | state = &is; |
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| 217 | roar_midi_basic_init(state); |
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| 218 | } |
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| 219 | |
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| 220 | n = &(state->note); |
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| 221 | |
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| 222 | for (; *notes != 0; notes++) { |
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| 223 | if ( *notes == '>' ) { |
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| 224 | n->octave++; |
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| 225 | } else if ( *notes == '<' ) { |
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| 226 | n->octave--; |
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| 227 | } else if ( *notes != ' ' ) { |
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| 228 | have++; |
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| 229 | } |
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| 230 | |
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| 231 | if (have) { |
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| 232 | roar_midi_play_note(stream, n, 60 * state->len.mul / state->len.div); |
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| 233 | have = 0; |
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| 234 | } |
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| 235 | } |
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| 236 | |
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| 237 | return 0; |
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| 238 | } |
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| 239 | |
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[203] | 240 | //ll |
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