1 | //roarsin.c: |
---|
2 | |
---|
3 | /* |
---|
4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008 |
---|
5 | * |
---|
6 | * This file is part of roarclients a part of RoarAudio, |
---|
7 | * a cross-platform sound system for both, home and professional use. |
---|
8 | * See README for details. |
---|
9 | * |
---|
10 | * This file is free software; you can redistribute it and/or modify |
---|
11 | * it under the terms of the GNU General Public License version 3 |
---|
12 | * as published by the Free Software Foundation. |
---|
13 | * |
---|
14 | * RoarAudio is distributed in the hope that it will be useful, |
---|
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
17 | * GNU General Public License for more details. |
---|
18 | * |
---|
19 | * You should have received a copy of the GNU General Public License |
---|
20 | * along with this software; see the file COPYING. If not, write to |
---|
21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
---|
22 | * |
---|
23 | */ |
---|
24 | |
---|
25 | #include <math.h> /* sin() */ |
---|
26 | #include <stdio.h> /* *printf*() */ |
---|
27 | #include <roaraudio.h> /* libroar */ |
---|
28 | |
---|
29 | double rect (double x) { |
---|
30 | x /= 2*M_PI; |
---|
31 | x -= (int)x; |
---|
32 | |
---|
33 | if ( x < 0.5 ) |
---|
34 | return 1; |
---|
35 | else |
---|
36 | return -1; |
---|
37 | } |
---|
38 | |
---|
39 | double saw (double x) { |
---|
40 | x /= 2*M_PI; |
---|
41 | x -= (int)x; |
---|
42 | |
---|
43 | return 2*x - 1; |
---|
44 | } |
---|
45 | |
---|
46 | double tri (double x) { |
---|
47 | x /= 2*M_PI; |
---|
48 | x -= (int)x; |
---|
49 | |
---|
50 | if ( x < 0.5 ) |
---|
51 | return 4* x - 1; |
---|
52 | else |
---|
53 | return -4*(x-0.5) + 1; |
---|
54 | } |
---|
55 | |
---|
56 | double trap (double x) { |
---|
57 | x /= 2*M_PI; |
---|
58 | x -= (int)x; |
---|
59 | |
---|
60 | if ( x < 0.125 || x > 0.875 ) { |
---|
61 | return -1; |
---|
62 | } else if ( x < 0.625 && x > 0.375 ) { |
---|
63 | return 1; |
---|
64 | } else if ( x < 0.5 ) { |
---|
65 | return 8*(x-0.375) + 1; |
---|
66 | } else { |
---|
67 | return -8*(x-0.625) + 1; |
---|
68 | } |
---|
69 | } |
---|
70 | |
---|
71 | int main (int argc, char * argv[]) { |
---|
72 | int rate = ROAR_RATE_DEFAULT; |
---|
73 | int bits = 16; |
---|
74 | int channels = 1; /* mono */ |
---|
75 | int codec = ROAR_CODEC_DEFAULT; |
---|
76 | float freq = 523.2; /* middle C */ |
---|
77 | float t = 0; /* current time */ |
---|
78 | float length = 5; /* 5 sec */ |
---|
79 | float step; /* how much time per sample we have to encode ... */ |
---|
80 | int fh; |
---|
81 | int i; |
---|
82 | int16_t out[1024]; |
---|
83 | double (*func)(double x) = sin; |
---|
84 | |
---|
85 | for (i = 1; i < argc; i++) { |
---|
86 | if ( !strcmp(argv[i], "--freq") ) { |
---|
87 | freq = atof(argv[++i]); |
---|
88 | } else if ( !strcmp(argv[i], "--time") ) { |
---|
89 | length = atof(argv[++i]); |
---|
90 | } else if ( !strcmp(argv[i], "--sin") ) { |
---|
91 | func = sin; |
---|
92 | } else if ( !strcmp(argv[i], "--rect") ) { |
---|
93 | func = rect; |
---|
94 | } else if ( !strcmp(argv[i], "--saw") ) { |
---|
95 | func = saw; |
---|
96 | } else if ( !strcmp(argv[i], "--tri") ) { |
---|
97 | func = tri; |
---|
98 | } else if ( !strcmp(argv[i], "--trap") ) { |
---|
99 | func = trap; |
---|
100 | } else { |
---|
101 | return 2; |
---|
102 | } |
---|
103 | } |
---|
104 | |
---|
105 | step = M_PI*2*freq/rate; |
---|
106 | |
---|
107 | if ( (fh = roar_simple_play(rate, channels, bits, codec, NULL, "sine gen")) == -1 ) { |
---|
108 | fprintf(stderr, "Error: can not open playback!\n"); |
---|
109 | exit(1); |
---|
110 | } |
---|
111 | |
---|
112 | while (t < 2*M_PI*freq*length) { |
---|
113 | for (i = 0; i < 1024; i++) { |
---|
114 | out[i] = 32767*func(t); |
---|
115 | t += step; |
---|
116 | } |
---|
117 | write(fh, out, 2048); |
---|
118 | } |
---|
119 | |
---|
120 | roar_simple_close(fh); |
---|
121 | |
---|
122 | return 0; |
---|
123 | } |
---|
124 | |
---|
125 | //ll |
---|