interpretor/libsndfile-1.0.25/examples/make_sine.c

   1 /*
   2 ** Copyright (C) 1999-2011 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
  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 ("Malloc failed.\n") ;
  59                 exit (0) ;
  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                 return 1 ;
  72                 } ;
  73
  74         if (sfinfo.channels == 1)
  75         {       for (k = 0 ; k < SAMPLE_COUNT ; k++)
  76                         buffer [k] = AMPLITUDE * sin (LEFT_FREQ * 2 * k * M_PI) ;
  77                 }
  78         else if (sfinfo.channels == 2)
  79         {       for (k = 0 ; k < SAMPLE_COUNT ; k++)
  80                 {       buffer [2 * k] = AMPLITUDE * sin (LEFT_FREQ * 2 * k * M_PI) ;
  81                         buffer [2 * k + 1] = AMPLITUDE * sin (RIGHT_FREQ * 2 * k * M_PI) ;
  82                         } ;
  83                 }
  84         else
  85         {       printf ("makesine can only generate mono or stereo files.\n") ;
  86                 exit (1) ;
  87                 } ;
  88
  89         if (sf_write_int (file, buffer, sfinfo.channels * SAMPLE_COUNT) !=
  90                                                                                         sfinfo.channels * SAMPLE_COUNT)
  91                 puts (sf_strerror (file)) ;
  92
  93         sf_close (file) ;
  94         return   0 ;
  95 } /* main */
  96