Initial commit of audiofilesubmit/1.0/20121129.024832submit/1.0/20121129.024342

1 files changed, 99 insertions, 0 deletions

diff --git a/examples/adddcoffset.c b/examples/adddcoffset.c
new file mode 100644
index 0000000..cadc6cb
--- /dev/null
+++ b/examples/adddcoffset.c
@@ -0,0 +1,99 @@
+/*
+	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);
+}