[203] | 1 | //midi.c: |
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| 2 | |
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| 3 | #include "libroar.h" |
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| 4 | |
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[367] | 5 | struct { |
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| 6 | uint16_t id; |
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| 7 | float freq; |
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| 8 | char * name; |
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| 9 | } _libroar_notes[] = { |
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| 10 | {ROAR_MIDI_NOTE_C , 261.625565, "C"}, |
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| 11 | {ROAR_MIDI_NOTE_Cs, 277.182631, "C#"}, |
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| 12 | {ROAR_MIDI_NOTE_D , 293.664768, "D"}, |
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| 13 | {ROAR_MIDI_NOTE_Ds, 311.126984, "D#"}, |
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| 14 | {ROAR_MIDI_NOTE_E , 329.627557, "E"}, |
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| 15 | {ROAR_MIDI_NOTE_F , 349.228231, "F"}, |
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| 16 | {ROAR_MIDI_NOTE_Fs, 369.994423, "F#"}, |
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| 17 | {ROAR_MIDI_NOTE_G , 391.995436, "G"}, |
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| 18 | {ROAR_MIDI_NOTE_Gs, 415.304698, "G#"}, |
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| 19 | {ROAR_MIDI_NOTE_A , 440.000000, "A"}, |
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| 20 | {ROAR_MIDI_NOTE_As, 466.163762, "A#"}, |
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| 21 | {ROAR_MIDI_NOTE_B , 493.883301, "B"}, |
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| 22 | {0, 0, NULL} |
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| 23 | }; |
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| 24 | |
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| 25 | char * roar_midi_note2name (uint16_t note) { |
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| 26 | int i; |
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| 27 | |
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| 28 | for (i = 0; _libroar_notes[i].name != NULL; i++) |
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| 29 | if ( _libroar_notes[i].id == note ) |
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| 30 | return _libroar_notes[i].name; |
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| 31 | |
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| 32 | return NULL; |
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| 33 | } |
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| 34 | |
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| 35 | uint16_t roar_midi_name2note (char * note) { |
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| 36 | int i; |
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| 37 | |
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| 38 | for (i = 0; _libroar_notes[i].name != NULL; i++) |
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| 39 | if ( strcasecmp(_libroar_notes[i].name, note) == 0 ) |
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| 40 | return _libroar_notes[i].id; |
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| 41 | |
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| 42 | return ROAR_MIDI_NOTE_NONE; |
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| 43 | } |
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| 44 | |
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| 45 | float roar_midi_note2freq (uint16_t note) { |
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| 46 | int i; |
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| 47 | |
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| 48 | for (i = 0; _libroar_notes[i].name != NULL; i++) |
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| 49 | if ( _libroar_notes[i].id == note ) |
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| 50 | return _libroar_notes[i].freq; |
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| 51 | |
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| 52 | return -1; |
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| 53 | } |
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| 54 | |
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| 55 | int roar_midi_find_octave (char * note); |
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| 56 | int roar_midi_add_octave (struct roar_note_octave * note) { |
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| 57 | note->name[0] = 0; |
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| 58 | return -1; |
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| 59 | } |
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| 60 | |
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| 61 | int roar_midi_notefill (struct roar_note_octave * note) { |
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| 62 | int oct; |
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| 63 | |
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| 64 | if ( !note ) |
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| 65 | return -1; |
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| 66 | |
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| 67 | if ( note->note && note->name[0] == 0 ) { |
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| 68 | roar_midi_add_octave(note); |
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| 69 | } else if ( !note->note && note->name[0] != 0 ) { |
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| 70 | return -1; |
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| 71 | } |
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| 72 | |
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| 73 | oct = 1 << abs(note->octave); |
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| 74 | |
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| 75 | note->freq = roar_midi_note2freq(note->note); |
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| 76 | |
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| 77 | if ( note->octave < 0 ) { |
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| 78 | note->freq /= oct; |
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| 79 | } else { |
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| 80 | note->freq *= oct; |
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| 81 | } |
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| 82 | |
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| 83 | return 0; |
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| 84 | } |
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| 85 | |
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| 86 | 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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| 87 | int i, c; |
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| 88 | float ct; |
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| 89 | float step = M_PI*2*note->freq/rate; |
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| 90 | int16_t s; |
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[369] | 91 | float (*op)(float x) = NULL; |
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[367] | 92 | |
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| 93 | /* |
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| 94 | rate: 1/s |
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| 95 | t : 1s |
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| 96 | freq: 1/s |
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| 97 | rew : 1s |
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| 98 | */ |
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| 99 | |
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[369] | 100 | if ( type == ROAR_MIDI_TYPE_SINE ) { |
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| 101 | op = sinf; |
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| 102 | } else { |
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| 103 | return -1; |
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| 104 | } |
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| 105 | |
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| 106 | if ( op == NULL ) |
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| 107 | return -1; |
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| 108 | |
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[367] | 109 | for (ct = 0, i = 0; ct <= t; ct += step, i += channels) { |
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[369] | 110 | s = 32767*op(ct); |
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[367] | 111 | |
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| 112 | for (c = 0; c < channels; c++) |
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| 113 | samples[i+c] = s; |
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| 114 | } |
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| 115 | |
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| 116 | return 0; |
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| 117 | } |
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| 118 | |
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[370] | 119 | |
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| 120 | int roar_midi_play_note (struct roar_stream * stream, struct roar_note_octave * note, float len) { |
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| 121 | return -1; |
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| 122 | } |
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| 123 | |
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| 124 | int roar_midi_basic_init (struct roar_midi_basic_state * state) { |
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| 125 | if (!state) |
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| 126 | return -1; |
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| 127 | |
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| 128 | state->len.mul = 1; |
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| 129 | state->len.div = 60; |
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| 130 | |
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| 131 | state->note.note = ROAR_MIDI_NOTE_NONE; |
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| 132 | state->note.octave = 0; |
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| 133 | |
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| 134 | return 0; |
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| 135 | } |
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| 136 | |
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| 137 | int roar_midi_basic_play (struct roar_stream * stream, struct roar_midi_basic_state * state, char * notes) { |
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| 138 | struct roar_midi_basic_state is; |
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| 139 | char cn[ROAR_MIDI_MAX_NOTENAME_LEN+1] = {0}; |
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| 140 | int i; |
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| 141 | int have = 0; |
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| 142 | struct roar_note_octave * n; |
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| 143 | |
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| 144 | if ( !notes ) |
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| 145 | return -1; |
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| 146 | |
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| 147 | if ( state == NULL ) { |
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| 148 | state = &is; |
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| 149 | roar_midi_basic_init(state); |
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| 150 | } |
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| 151 | |
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| 152 | n = &(state->note); |
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| 153 | |
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| 154 | for (; *notes != 0; notes++) { |
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| 155 | if ( *notes == '>' ) { |
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| 156 | n->octave++; |
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| 157 | } else if ( *notes == '<' ) { |
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| 158 | n->octave--; |
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| 159 | } else if ( *notes != ' ' ) { |
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| 160 | have++; |
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| 161 | } |
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| 162 | |
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| 163 | if (have) { |
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| 164 | roar_midi_play_note(stream, n, 60 * state->len.mul / state->len.div); |
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| 165 | have = 0; |
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| 166 | } |
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| 167 | } |
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| 168 | |
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| 169 | return 0; |
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| 170 | } |
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| 171 | |
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[203] | 172 | //ll |
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