99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
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/*
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Audio File Library
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Copyright 1998, Michael Pruett <michael@68k.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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adddcoffset.c
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This program adds a user-specified DC offset term to a sound file.
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It's not very useful.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef __USE_SGI_HEADERS__
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#include <dmedia/audiofile.h>
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#else
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#include "audiofile.h"
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#endif
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void adddcoffset (float offset, char *infilename, char *outfilename);
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void usageerror (void);
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int main (int ac, char **av)
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{
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float offset;
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if (ac != 4)
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usageerror();
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offset = atof(av[1]);
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adddcoffset(offset, av[2], av[3]);
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return 0;
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}
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void adddcoffset (float offset, char *infilename, char *outfilename)
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{
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AFfilehandle infile = afOpenFile(infilename, "r", NULL);
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int channelCount, frameCount;
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short *buffer;
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int i;
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AFfilesetup outfilesetup = afNewFileSetup();
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AFfilehandle outfile;
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frameCount = afGetFrameCount(infile, AF_DEFAULT_TRACK);
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channelCount = afGetChannels(infile, AF_DEFAULT_TRACK);
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afInitFileFormat(outfilesetup, AF_FILE_AIFF);
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afInitByteOrder(outfilesetup, AF_DEFAULT_TRACK, AF_BYTEORDER_BIGENDIAN);
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afInitChannels(outfilesetup, AF_DEFAULT_TRACK, channelCount);
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afInitRate(outfilesetup, AF_DEFAULT_TRACK, 44100.0);
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afInitSampleFormat(outfilesetup, AF_DEFAULT_TRACK, AF_SAMPFMT_TWOSCOMP, 16);
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outfile = afOpenFile(outfilename, "w", outfilesetup);
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if (infile == NULL)
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{
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printf("unable to open input file '%s'.\n", infilename);
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return;
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}
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printf("afGetFrameCount: %d\n", (int)afGetFrameCount(infile, AF_DEFAULT_TRACK));
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printf("afGetChannels: %d\n", afGetChannels(infile, AF_DEFAULT_TRACK));
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buffer = (short *) malloc(frameCount * channelCount * sizeof (short));
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afReadFrames(infile, AF_DEFAULT_TRACK, (void *) buffer, frameCount);
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for (i=0; i<frameCount; i++)
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{
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buffer[i] += offset;
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}
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afWriteFrames(outfile, AF_DEFAULT_TRACK, (void *) buffer, frameCount);
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afCloseFile(outfile);
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}
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void usageerror (void)
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{
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fprintf(stderr, "usage: adddcoffset offset infile outfile\n");
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exit(EXIT_FAILURE);
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}
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