| 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 | int midi_init (void) { |
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| 28 | int i; |
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| 29 | char * files[] = { |
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| 30 | "/dev/console", |
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| 31 | #ifdef __linux__ |
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| 32 | "/dev/tty0", |
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| 33 | "/dev/vc/0", |
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| 34 | #endif |
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| 35 | NULL |
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| 36 | }; |
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| 37 | |
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| 38 | g_console = -1; |
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| 39 | g_midi_cb_stoptime = 0; |
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| 40 | g_midi_cb_playing = 0; |
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| 41 | |
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| 42 | for (i = 0; files[i] != NULL; i++) { |
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| 43 | if ( (g_console = open(files[i], O_WRONLY|O_NOCTTY, 0)) != -1 ) |
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| 44 | break; |
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| 45 | } |
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| 46 | |
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| 47 | if ( g_console != -1 ) { |
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| 48 | return 0; |
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| 49 | } else { |
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| 50 | return -1; |
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| 51 | } |
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| 52 | } |
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| 53 | |
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| 54 | int midi_free (void) { |
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| 55 | if ( g_console != -1 ) |
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| 56 | close(g_console); |
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| 57 | return 0; |
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| 58 | } |
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| 59 | |
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| 60 | int midi_cb_play(float t, float freq, int override) { |
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| 61 | float samples_per_sec /* S/s */ = g_sa->rate * g_sa->channels; |
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| 62 | |
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| 63 | /* |
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| 64 | #define MIDI_CB_NOOVERRIDE 0 |
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| 65 | #define MIDI_CB_OVERRIDE 1 |
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| 66 | */ |
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| 67 | if ( g_midi_cb_playing && override != MIDI_CB_OVERRIDE ) |
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| 68 | return -1; |
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| 69 | |
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| 70 | g_midi_cb_stoptime = ROAR_MATH_OVERFLOW_ADD(g_pos, samples_per_sec*t); |
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| 71 | midi_cb_start(freq); |
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| 72 | g_midi_cb_playing = 1; |
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| 73 | |
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| 74 | return 0; |
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| 75 | } |
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| 76 | |
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| 77 | int midi_cb_update (void) { |
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| 78 | if ( !g_midi_cb_playing ) |
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| 79 | return 0; |
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| 80 | |
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| 81 | if ( g_midi_cb_stoptime <= g_pos ) |
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| 82 | midi_cb_stop(); |
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| 83 | |
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| 84 | return 0; |
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| 85 | } |
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| 86 | |
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| 87 | int midi_cb_start(float freq) { |
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| 88 | // On linux this uses ioctl KIOCSOUND |
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| 89 | #ifdef __linux__ |
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| 90 | if ( g_console == -1 ) |
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| 91 | return -1; |
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| 92 | |
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| 93 | if ( ioctl(g_console, KIOCSOUND, freq == 0 ? 0 : (int)(1193180.0/freq)) == -1 ) |
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| 94 | return -1; |
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| 95 | |
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| 96 | return 0; |
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| 97 | #else |
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| 98 | return -1; |
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| 99 | #endif |
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| 100 | } |
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| 101 | |
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| 102 | int midi_cb_stop (void) { |
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| 103 | #ifdef __linux__ |
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| 104 | g_midi_cb_playing = 0; |
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| 105 | return midi_cb_start(0); |
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| 106 | #else |
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| 107 | return -1; |
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| 108 | #endif |
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| 109 | } |
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| 110 | |
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| 111 | //ll |
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