101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
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/*
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** Copyright (C) 1999-2012 Erik de Castro Lopo <erikd@mega-nerd.com>
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**
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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**
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the author nor the names of any contributors may be used
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** to endorse or promote products derived from this software without
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** specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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** TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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** PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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** EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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** PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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** OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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** OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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** ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <sndfile.h>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846264338
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#endif
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#define SAMPLE_RATE 44100
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#define SAMPLE_COUNT (SAMPLE_RATE * 4) /* 4 seconds */
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#define AMPLITUDE (1.0 * 0x7F000000)
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#define LEFT_FREQ (344.0 / SAMPLE_RATE)
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#define RIGHT_FREQ (466.0 / SAMPLE_RATE)
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int
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main (void)
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{ SNDFILE *file ;
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SF_INFO sfinfo ;
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int k ;
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int *buffer ;
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if (! (buffer = malloc (2 * SAMPLE_COUNT * sizeof (int))))
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{ printf ("Error : Malloc failed.\n") ;
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return 1 ;
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} ;
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memset (&sfinfo, 0, sizeof (sfinfo)) ;
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sfinfo.samplerate = SAMPLE_RATE ;
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sfinfo.frames = SAMPLE_COUNT ;
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sfinfo.channels = 2 ;
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sfinfo.format = (SF_FORMAT_WAV | SF_FORMAT_PCM_24) ;
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if (! (file = sf_open ("sine.wav", SFM_WRITE, &sfinfo)))
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{ printf ("Error : Not able to open output file.\n") ;
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free (buffer) ;
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return 1 ;
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} ;
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if (sfinfo.channels == 1)
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{ for (k = 0 ; k < SAMPLE_COUNT ; k++)
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buffer [k] = (int) (AMPLITUDE * sin (LEFT_FREQ * 2 * k * M_PI)) ;
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}
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else if (sfinfo.channels == 2)
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{ for (k = 0 ; k < SAMPLE_COUNT ; k++)
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{ buffer [2 * k] = (int) (AMPLITUDE * sin (LEFT_FREQ * 2 * k * M_PI)) ;
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buffer [2 * k + 1] = (int) (AMPLITUDE * sin (RIGHT_FREQ * 2 * k * M_PI)) ;
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} ;
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}
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else
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{ printf ("Error : make_sine can only generate mono or stereo files.\n") ;
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sf_close (file) ;
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free (buffer) ;
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return 1 ;
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} ;
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if (sf_write_int (file, buffer, sfinfo.channels * SAMPLE_COUNT) !=
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sfinfo.channels * SAMPLE_COUNT)
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puts (sf_strerror (file)) ;
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sf_close (file) ;
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free (buffer) ;
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return 0 ;
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} /* main */
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