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 - 2008 |
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5 | * |
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6 | * This file is part of roard 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 | * RoarAudio 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 "roard.h" |
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26 | |
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27 | #if defined(ROAR_HAVE_IO_POSIX) && !defined(ROAR_TARGET_WIN32) |
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28 | #define _HAVE_CONSOLE |
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29 | #endif |
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30 | |
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31 | int midi_init (void) { |
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32 | |
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33 | if ( midi_cb_init() == -1 ) { |
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34 | ROAR_WARN("Can not initialize MIDI subsystem component CB"); |
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35 | } |
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36 | |
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37 | return 0; |
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38 | } |
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39 | int midi_free (void) { |
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40 | return midi_cb_free(); |
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41 | } |
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42 | |
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43 | int midi_update(void) { |
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44 | return midi_cb_update(); |
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45 | } |
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46 | |
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47 | |
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48 | int midi_cb_init (void) { |
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49 | #ifdef _HAVE_CONSOLE |
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50 | struct roar_stream * s; |
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51 | struct roar_stream_server * ss; |
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52 | int i; |
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53 | char * files[] = { |
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54 | "/dev/console", |
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55 | #ifdef __linux__ |
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56 | "/dev/tty0", |
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57 | "/dev/vc/0", |
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58 | #endif |
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59 | NULL |
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60 | }; |
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61 | |
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62 | g_console = -1; |
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63 | g_midi_cb_stream = -1; |
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64 | g_midi_cb_stoptime = 0; |
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65 | g_midi_cb_playing = 0; |
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66 | |
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67 | for (i = 0; files[i] != NULL; i++) { |
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68 | if ( (g_console = open(files[i], O_WRONLY|O_NOCTTY, 0)) != -1 ) |
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69 | break; |
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70 | } |
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71 | |
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72 | if ( g_console == -1 ) |
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73 | return -1; |
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74 | |
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75 | if ( (g_midi_cb_stream = streams_new()) == -1 ) { |
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76 | ROAR_WARN("Error while initializing MIDI subsystem component CB"); |
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77 | midi_cb_free(); |
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78 | return -1; |
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79 | } |
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80 | |
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81 | streams_get(g_midi_cb_stream, &ss); |
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82 | s = ROAR_STREAM(ss); |
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83 | |
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84 | memcpy(&(s->info), g_sa, sizeof(struct roar_audio_info)); |
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85 | |
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86 | s->pos_rel_id = -1; |
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87 | |
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88 | s->info.codec = 0; |
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89 | ss->codec_orgi = 0; |
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90 | |
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91 | s->info.channels = 1; |
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92 | s->info.rate = 1193180; |
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93 | s->info.bits = 8; |
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94 | |
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95 | if ( streams_set_dir(g_midi_cb_stream, ROAR_DIR_BRIDGE, 1) == -1 ) { |
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96 | ROAR_WARN("Error while initializing MIDI subsystem component CB"); |
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97 | midi_cb_free(); |
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98 | return -1; |
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99 | } |
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100 | |
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101 | streams_set_name(g_midi_cb_stream, "Console speaker bridge"); |
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102 | |
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103 | streams_set_flag(g_midi_cb_stream, ROAR_FLAG_OUTPUT); |
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104 | streams_set_flag(g_midi_cb_stream, ROAR_FLAG_PRIMARY); |
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105 | |
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106 | return 0; |
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107 | #else |
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108 | g_console = -1; |
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109 | g_midi_cb_stream = -1; |
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110 | |
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111 | return -1; |
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112 | #endif |
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113 | } |
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114 | |
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115 | int midi_cb_free (void) { |
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116 | #ifdef _HAVE_CONSOLE |
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117 | |
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118 | midi_cb_stop(); |
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119 | |
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120 | if ( g_midi_cb_stream != -1 ) |
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121 | streams_delete(g_midi_cb_stream); |
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122 | |
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123 | if ( g_console != -1 ) |
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124 | close(g_console); |
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125 | |
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126 | return 0; |
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127 | #else |
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128 | return -1; |
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129 | #endif |
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130 | } |
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131 | |
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132 | int midi_cb_play(float t, float freq, int override) { |
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133 | float samples_per_sec /* S/s */ = g_sa->rate * g_sa->channels; |
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134 | |
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135 | /* |
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136 | #define MIDI_CB_NOOVERRIDE 0 |
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137 | #define MIDI_CB_OVERRIDE 1 |
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138 | */ |
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139 | if ( g_midi_cb_playing && override != MIDI_CB_OVERRIDE ) |
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140 | return -1; |
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141 | |
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142 | g_midi_cb_stoptime = ROAR_MATH_OVERFLOW_ADD(g_pos, samples_per_sec*t); |
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143 | midi_cb_start(freq); |
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144 | g_midi_cb_playing = 1; |
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145 | |
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146 | return 0; |
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147 | } |
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148 | |
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149 | int midi_cb_update (void) { |
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150 | if ( !g_midi_cb_playing ) |
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151 | return 0; |
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152 | |
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153 | if ( g_midi_cb_stoptime <= g_pos ) |
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154 | midi_cb_stop(); |
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155 | |
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156 | return 0; |
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157 | } |
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158 | |
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159 | int midi_cb_start(float freq) { |
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160 | // On linux this uses ioctl KIOCSOUND |
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161 | #ifdef __linux__ |
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162 | if ( g_console == -1 ) |
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163 | return -1; |
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164 | |
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165 | if ( ioctl(g_console, KIOCSOUND, freq == 0 ? 0 : (int)(1193180.0/freq)) == -1 ) |
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166 | return -1; |
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167 | |
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168 | return 0; |
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169 | #else |
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170 | return -1; |
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171 | #endif |
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172 | } |
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173 | |
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174 | int midi_cb_stop (void) { |
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175 | #ifdef __linux__ |
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176 | g_midi_cb_playing = 0; |
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177 | return midi_cb_start(0); |
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178 | #else |
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179 | return -1; |
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180 | #endif |
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181 | } |
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182 | |
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183 | //ll |
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