ref: 5603f1be4bf0e960ccba8fa513594d52cd5ac347
dir: /common/libsndfile/examples/wav32_aiff24.c/
/*
** Copyright (C) 1999-2000 Erik de Castro Lopo <erikd@zip.com.au>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <sndfile.h>
#define BUFFER_LEN 1024
static double data [BUFFER_LEN] ;
static
void copy_data (SNDFILE *outfile, SNDFILE *infile, unsigned int len, double normfactor)
{ unsigned int readcount, k ;
readcount = len ;
while (readcount == len)
{ readcount = sf_read_double (infile, data, len, 0) ;
for (k = 0 ; k < readcount ; k++)
data [k] *= normfactor ;
sf_write_double (outfile, data, readcount, 0) ;
} ;
return ;
} /* copy_data */
static
void print_usage (char *progname)
{
printf ("\nConverts a 32 bit floating point WAV file into a 24 bit PCM AIFF file.\n") ;
printf (" Usage : %s <input file> <output file>\n\n", progname) ;
} /* print_usage */
int main (int argc, char *argv[])
{ char *progname, *infilename, *outfilename ;
SNDFILE *infile, *outfile ;
SF_INFO sfinfo ;
double normfactor ;
progname = strrchr (argv [0], '/') ;
progname = progname ? progname + 1 : argv [0] ;
if (argc != 3)
{ print_usage (progname) ;
return 1 ;
} ;
infilename = argv [1] ;
outfilename = argv [2] ;
if (! strcmp (infilename, outfilename))
{ printf ("Error : Input and output filenames are the same.\n\n") ;
print_usage (progname) ;
return 1 ;
} ;
if (! (infile = sf_open_read (infilename, &sfinfo)))
{ printf ("Not able to open input file %s.\n", infilename) ;
sf_perror (NULL) ;
return 1 ;
} ;
if (sfinfo.format != (SF_FORMAT_WAV | SF_FORMAT_FLOAT))
{ printf ("Error : Input file %s is not a 32 bit floating point WAV file.\n", infilename) ;
return 1 ;
} ;
sfinfo.format = (SF_FORMAT_AIFF | SF_FORMAT_PCM) ;
sfinfo.pcmbitwidth = 24 ;
normfactor = sf_signal_max (infile) ;
if (normfactor < 1.0 && normfactor > 0.0)
normfactor = ((double) 0x400000) ;
else
normfactor = 1.0 ;
printf ("normfactor : %g\n", normfactor) ;
if (! (outfile = sf_open_write (outfilename, &sfinfo)))
{ printf ("Not able to open output file %s.\n", outfilename) ;
return 1 ;
} ;
copy_data (outfile, infile, BUFFER_LEN / sfinfo.channels, normfactor) ;
sf_close (infile) ;
sf_close (outfile) ;
return 0 ;
} /* main */