[154] | 1 | //roarsin.c: |
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| 2 | |
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[669] | 3 | /* |
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[4708] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2011 |
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[669] | 5 | * |
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| 6 | * This file is part of roarclients 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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[3517] | 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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[669] | 23 | * |
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| 24 | */ |
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| 25 | |
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[1103] | 26 | #include <roaraudio.h> /* libroar */ |
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| 27 | |
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| 28 | #ifdef ROAR_HAVE_LIBM |
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| 29 | |
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[154] | 30 | #include <math.h> /* sin() */ |
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| 31 | #include <stdio.h> /* *printf*() */ |
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| 32 | |
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[887] | 33 | double rect (double x) { |
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| 34 | x /= 2*M_PI; |
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| 35 | x -= (int)x; |
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| 36 | |
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| 37 | if ( x < 0.5 ) |
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| 38 | return 1; |
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| 39 | else |
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| 40 | return -1; |
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| 41 | } |
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| 42 | |
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| 43 | double saw (double x) { |
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| 44 | x /= 2*M_PI; |
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| 45 | x -= (int)x; |
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| 46 | |
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| 47 | return 2*x - 1; |
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| 48 | } |
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| 49 | |
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| 50 | double tri (double x) { |
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| 51 | x /= 2*M_PI; |
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| 52 | x -= (int)x; |
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| 53 | |
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| 54 | if ( x < 0.5 ) |
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| 55 | return 4* x - 1; |
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| 56 | else |
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| 57 | return -4*(x-0.5) + 1; |
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| 58 | } |
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| 59 | |
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[888] | 60 | double trap (double x) { |
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| 61 | x /= 2*M_PI; |
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| 62 | x -= (int)x; |
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| 63 | |
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| 64 | if ( x < 0.125 || x > 0.875 ) { |
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| 65 | return -1; |
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| 66 | } else if ( x < 0.625 && x > 0.375 ) { |
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| 67 | return 1; |
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| 68 | } else if ( x < 0.5 ) { |
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| 69 | return 8*(x-0.375) + 1; |
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| 70 | } else { |
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| 71 | return -8*(x-0.625) + 1; |
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| 72 | } |
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| 73 | } |
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| 74 | |
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[887] | 75 | int main (int argc, char * argv[]) { |
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[154] | 76 | int rate = ROAR_RATE_DEFAULT; |
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[887] | 77 | int bits = 16; |
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[154] | 78 | int channels = 1; /* mono */ |
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| 79 | int codec = ROAR_CODEC_DEFAULT; |
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| 80 | float freq = 523.2; /* middle C */ |
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| 81 | float t = 0; /* current time */ |
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[5186] | 82 | float tcalc = 0; /* current time for calculation */ |
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[154] | 83 | float length = 5; /* 5 sec */ |
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[887] | 84 | float step; /* how much time per sample we have to encode ... */ |
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[4885] | 85 | roar_vs_t * vss; |
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| 86 | int err; |
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[154] | 87 | int i; |
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[887] | 88 | int16_t out[1024]; |
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| 89 | double (*func)(double x) = sin; |
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| 90 | |
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| 91 | for (i = 1; i < argc; i++) { |
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| 92 | if ( !strcmp(argv[i], "--freq") ) { |
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| 93 | freq = atof(argv[++i]); |
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| 94 | } else if ( !strcmp(argv[i], "--time") ) { |
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| 95 | length = atof(argv[++i]); |
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| 96 | } else if ( !strcmp(argv[i], "--sin") ) { |
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| 97 | func = sin; |
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[888] | 98 | } else if ( !strcmp(argv[i], "--rect") ) { |
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| 99 | func = rect; |
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[887] | 100 | } else if ( !strcmp(argv[i], "--saw") ) { |
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| 101 | func = saw; |
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| 102 | } else if ( !strcmp(argv[i], "--tri") ) { |
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| 103 | func = tri; |
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[888] | 104 | } else if ( !strcmp(argv[i], "--trap") ) { |
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| 105 | func = trap; |
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[887] | 106 | } else { |
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| 107 | return 2; |
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| 108 | } |
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| 109 | } |
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| 110 | |
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| 111 | step = M_PI*2*freq/rate; |
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[154] | 112 | |
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[4885] | 113 | if ( (vss = roar_vs_new_playback(NULL, "sine gen", rate, channels, codec, bits, &err)) == NULL ) { |
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| 114 | fprintf(stderr, "Error: can not open playback: %s\n", roar_vs_strerr(err)); |
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[154] | 115 | exit(1); |
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| 116 | } |
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| 117 | |
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| 118 | while (t < 2*M_PI*freq*length) { |
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| 119 | for (i = 0; i < 1024; i++) { |
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[5186] | 120 | out[i] = 32767*func(tcalc); |
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| 121 | t += step; |
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| 122 | tcalc += step; |
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[154] | 123 | } |
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[5249] | 124 | if ( roar_vs_write(vss, out, 2048, &err) != (ssize_t)2048 ) { |
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| 125 | fprintf(stderr, "Error: can not write data: %s\n", roar_vs_strerr(err)); |
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| 126 | break; |
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| 127 | } |
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[5186] | 128 | |
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| 129 | // this code enables us to generate the same signal for a long periode of time |
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| 130 | // without loosing accuracy of the float type. |
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| 131 | while (tcalc > 2*M_PI) |
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| 132 | tcalc -= 2*M_PI; |
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[154] | 133 | } |
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| 134 | |
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[4885] | 135 | roar_vs_close(vss, ROAR_VS_FALSE, NULL); |
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[154] | 136 | |
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| 137 | return 0; |
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| 138 | } |
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| 139 | |
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[1103] | 140 | #else |
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| 141 | int main (void) { |
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| 142 | fprintf(stderr, "Error: No Math library support compiled in.\n"); |
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| 143 | return 1; |
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| 144 | } |
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| 145 | #endif |
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| 146 | |
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[154] | 147 | //ll |
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