1 /*
2 ** Copyright (C) 1999-2012 Erik de Castro Lopo <erikd@mega-nerd.com>
3 **
4 ** All rights reserved.
5 **
6 ** Redistribution and use in source and binary forms, with or without
7 ** modification, are permitted provided that the following conditions are
8 ** met:
9 **
10 ** * Redistributions of source code must retain the above copyright
11 ** notice, this list of conditions and the following disclaimer.
12 ** * Redistributions in binary form must reproduce the above copyright
13 ** notice, this list of conditions and the following disclaimer in
14 ** the documentation and/or other materials provided with the
15 ** distribution.
16 ** * Neither the author nor the names of any contributors may be used
17 ** to endorse or promote products derived from this software without
18 ** specific prior written permission.
19 **
20 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 ** TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 ** PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24 ** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 ** EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 ** PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
27 ** OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28 ** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29 ** OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
30 ** ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <math.h>
37
38 #include <sndfile.h>
39
40 #ifndef M_PI
41 #define M_PI 3.14159265358979323846264338
42 #endif
43
44 #define SAMPLE_RATE 44100
45 #define SAMPLE_COUNT (SAMPLE_RATE * 4) /* 4 seconds */
46 #define AMPLITUDE (1.0 * 0x7F000000)
47 #define LEFT_FREQ (344.0 / SAMPLE_RATE)
48 #define RIGHT_FREQ (466.0 / SAMPLE_RATE)
49
50 int
main(void)51 main (void)
52 { SNDFILE *file ;
53 SF_INFO sfinfo ;
54 int k ;
55 int *buffer ;
56
57 if (! (buffer = malloc (2 * SAMPLE_COUNT * sizeof (int))))
58 { printf ("Error : Malloc failed.\n") ;
59 return 1 ;
60 } ;
61
62 memset (&sfinfo, 0, sizeof (sfinfo)) ;
63
64 sfinfo.samplerate = SAMPLE_RATE ;
65 sfinfo.frames = SAMPLE_COUNT ;
66 sfinfo.channels = 2 ;
67 sfinfo.format = (SF_FORMAT_WAV | SF_FORMAT_PCM_24) ;
68
69 if (! (file = sf_open ("sine.wav", SFM_WRITE, &sfinfo)))
70 { printf ("Error : Not able to open output file.\n") ;
71 free (buffer) ;
72 return 1 ;
73 } ;
74
75 if (sfinfo.channels == 1)
76 { for (k = 0 ; k < SAMPLE_COUNT ; k++)
77 buffer [k] = AMPLITUDE * sin (LEFT_FREQ * 2 * k * M_PI) ;
78 }
79 else if (sfinfo.channels == 2)
80 { for (k = 0 ; k < SAMPLE_COUNT ; k++)
81 { buffer [2 * k] = AMPLITUDE * sin (LEFT_FREQ * 2 * k * M_PI) ;
82 buffer [2 * k + 1] = AMPLITUDE * sin (RIGHT_FREQ * 2 * k * M_PI) ;
83 } ;
84 }
85 else
86 { printf ("Error : make_sine can only generate mono or stereo files.\n") ;
87 sf_close (file) ;
88 free (buffer) ;
89 return 1 ;
90 } ;
91
92 if (sf_write_int (file, buffer, sfinfo.channels * SAMPLE_COUNT) !=
93 sfinfo.channels * SAMPLE_COUNT)
94 puts (sf_strerror (file)) ;
95
96 sf_close (file) ;
97 free (buffer) ;
98 return 0 ;
99 } /* main */
100
101