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/*
Audio File Library
Copyright 1998, Michael Pruett <michael@68k.org>
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.
*/
/*
adddcoffset.c
This program adds a user-specified DC offset term to a sound file.
It's not very useful.
*/
#include <stdio.h>
#include <stdlib.h>
#ifdef __USE_SGI_HEADERS__
#include <dmedia/audiofile.h>
#else
#include "audiofile.h"
#endif
void adddcoffset (float offset, char *infilename, char *outfilename);
void usageerror (void);
int main (int ac, char **av)
{
float offset;
if (ac != 4)
usageerror();
offset = atof(av[1]);
adddcoffset(offset, av[2], av[3]);
return 0;
}
void adddcoffset (float offset, char *infilename, char *outfilename)
{
AFfilehandle infile = afOpenFile(infilename, "r", NULL);
int channelCount, frameCount;
short *buffer;
int i;
AFfilesetup outfilesetup = afNewFileSetup();
AFfilehandle outfile;
frameCount = afGetFrameCount(infile, AF_DEFAULT_TRACK);
channelCount = afGetChannels(infile, AF_DEFAULT_TRACK);
afInitFileFormat(outfilesetup, AF_FILE_AIFF);
afInitByteOrder(outfilesetup, AF_DEFAULT_TRACK, AF_BYTEORDER_BIGENDIAN);
afInitChannels(outfilesetup, AF_DEFAULT_TRACK, channelCount);
afInitRate(outfilesetup, AF_DEFAULT_TRACK, 44100.0);
afInitSampleFormat(outfilesetup, AF_DEFAULT_TRACK, AF_SAMPFMT_TWOSCOMP, 16);
outfile = afOpenFile(outfilename, "w", outfilesetup);
if (infile == NULL)
{
printf("unable to open input file '%s'.\n", infilename);
return;
}
printf("afGetFrameCount: %d\n", (int)afGetFrameCount(infile, AF_DEFAULT_TRACK));
printf("afGetChannels: %d\n", afGetChannels(infile, AF_DEFAULT_TRACK));
buffer = (short *) malloc(frameCount * channelCount * sizeof (short));
afReadFrames(infile, AF_DEFAULT_TRACK, (void *) buffer, frameCount);
for (i=0; i<frameCount; i++)
{
buffer[i] += offset;
}
afWriteFrames(outfile, AF_DEFAULT_TRACK, (void *) buffer, frameCount);
afCloseFile(outfile);
}
void usageerror (void)
{
fprintf(stderr, "usage: adddcoffset offset infile outfile\n");
exit(EXIT_FAILURE);
}
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