1 | //midi.c: |
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2 | |
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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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25 | #include "libroardsp.h" |
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26 | |
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27 | struct { |
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28 | uint16_t id; |
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29 | float freq; |
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30 | char * name; |
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31 | } _libroar_notes[] = { |
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32 | {ROAR_MIDI_NOTE_C , 261.625565, "C"}, |
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33 | {ROAR_MIDI_NOTE_Cs, 277.182631, "C#"}, |
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34 | {ROAR_MIDI_NOTE_D , 293.664768, "D"}, |
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35 | {ROAR_MIDI_NOTE_Ds, 311.126984, "D#"}, |
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36 | {ROAR_MIDI_NOTE_E , 329.627557, "E"}, |
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37 | {ROAR_MIDI_NOTE_F , 349.228231, "F"}, |
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38 | {ROAR_MIDI_NOTE_Fs, 369.994423, "F#"}, |
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39 | {ROAR_MIDI_NOTE_G , 391.995436, "G"}, |
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40 | {ROAR_MIDI_NOTE_Gs, 415.304698, "G#"}, |
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41 | {ROAR_MIDI_NOTE_A , 440.000000, "A"}, |
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42 | {ROAR_MIDI_NOTE_As, 466.163762, "A#"}, |
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43 | {ROAR_MIDI_NOTE_B , 493.883301, "B"}, |
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44 | {0, 0, NULL} |
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45 | }; |
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46 | |
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47 | char * roar_midi_note2name (uint16_t note) { |
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48 | int i; |
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49 | |
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50 | for (i = 0; _libroar_notes[i].name != NULL; i++) |
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51 | if ( _libroar_notes[i].id == note ) |
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52 | return _libroar_notes[i].name; |
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53 | |
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54 | return NULL; |
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55 | } |
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56 | |
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57 | uint16_t roar_midi_name2note (char * note) { |
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58 | int i; |
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59 | |
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60 | for (i = 0; _libroar_notes[i].name != NULL; i++) |
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61 | if ( strcasecmp(_libroar_notes[i].name, note) == 0 ) |
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62 | return _libroar_notes[i].id; |
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63 | |
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64 | return ROAR_MIDI_NOTE_NONE; |
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65 | } |
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66 | |
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67 | float roar_midi_note2freq (uint16_t note) { |
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68 | int i; |
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69 | |
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70 | for (i = 0; _libroar_notes[i].name != NULL; i++) |
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71 | if ( _libroar_notes[i].id == note ) |
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72 | return _libroar_notes[i].freq; |
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73 | |
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74 | return -1; |
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75 | } |
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76 | |
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77 | int roar_midi_find_octave (char * note); |
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78 | int roar_midi_add_octave (struct roar_note_octave * note) { |
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79 | note->name[0] = 0; |
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80 | return -1; |
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81 | } |
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82 | |
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83 | int roar_midi_notefill (struct roar_note_octave * note) { |
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84 | int oct; |
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85 | |
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86 | if ( !note ) |
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87 | return -1; |
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88 | |
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89 | if ( note->note && note->name[0] == 0 ) { |
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90 | roar_midi_add_octave(note); |
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91 | } else if ( !note->note && note->name[0] != 0 ) { |
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92 | return -1; |
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93 | } |
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94 | |
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95 | oct = 1 << abs(note->octave); |
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96 | |
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97 | note->freq = roar_midi_note2freq(note->note); |
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98 | |
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99 | if ( note->octave < 0 ) { |
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100 | note->freq /= oct; |
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101 | } else { |
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102 | note->freq *= oct; |
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103 | } |
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104 | |
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105 | return 0; |
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106 | } |
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107 | |
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108 | 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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109 | #ifdef ROAR_HAVE_LIBM |
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110 | int i, c; |
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111 | float ct; |
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112 | float step = M_PI*2*note->freq/rate; |
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113 | int16_t s; |
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114 | float (*op)(float x) = NULL; |
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115 | |
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116 | /* |
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117 | rate: 1/s |
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118 | t : 1s |
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119 | freq: 1/s |
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120 | rew : 1s |
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121 | */ |
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122 | |
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123 | if ( type == ROAR_MIDI_TYPE_SINE ) { |
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124 | op = sinf; |
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125 | } else { |
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126 | return -1; |
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127 | } |
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128 | |
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129 | if ( op == NULL ) |
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130 | return -1; |
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131 | |
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132 | for (ct = 0, i = 0; ct <= t; ct += step, i += channels) { |
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133 | s = 32767*op(ct); |
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134 | |
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135 | for (c = 0; c < channels; c++) |
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136 | samples[i+c] = s; |
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137 | } |
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138 | |
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139 | return 0; |
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140 | #else |
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141 | return -1; |
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142 | #endif |
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143 | } |
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144 | |
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145 | |
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146 | int roar_midi_play_note (struct roar_stream * stream, struct roar_note_octave * note, float len) { |
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147 | return -1; |
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148 | } |
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149 | |
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150 | int roar_midi_basic_init (struct roar_midi_basic_state * state) { |
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151 | if (!state) |
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152 | return -1; |
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153 | |
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154 | state->len.mul = 1; |
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155 | state->len.div = 60; |
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156 | |
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157 | state->note.note = ROAR_MIDI_NOTE_NONE; |
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158 | state->note.octave = 0; |
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159 | |
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160 | return 0; |
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161 | } |
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162 | |
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163 | int roar_midi_basic_play (struct roar_stream * stream, struct roar_midi_basic_state * state, char * notes) { |
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164 | struct roar_midi_basic_state is; |
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165 | char cn[ROAR_MIDI_MAX_NOTENAME_LEN+1] = {0}; |
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166 | int i; |
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167 | int have = 0; |
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168 | struct roar_note_octave * n; |
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169 | |
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170 | if ( !notes ) |
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171 | return -1; |
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172 | |
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173 | if ( state == NULL ) { |
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174 | state = &is; |
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175 | roar_midi_basic_init(state); |
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176 | } |
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177 | |
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178 | n = &(state->note); |
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179 | |
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180 | for (; *notes != 0; notes++) { |
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181 | if ( *notes == '>' ) { |
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182 | n->octave++; |
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183 | } else if ( *notes == '<' ) { |
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184 | n->octave--; |
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185 | } else if ( *notes != ' ' ) { |
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186 | have++; |
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187 | } |
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188 | |
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189 | if (have) { |
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190 | roar_midi_play_note(stream, n, 60 * state->len.mul / state->len.div); |
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191 | have = 0; |
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192 | } |
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193 | } |
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194 | |
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195 | return 0; |
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196 | } |
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197 | |
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198 | //ll |
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