sixteen-to-eight.c
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/*
Audio File Library
Copyright 2000, Silicon Graphics, Inc.
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.
*/
/*
sixteen-to-eight.c
This program tests the conversion from 16-bit integers to 8-bit
integers.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <audiofile.h>
#define TEST_FILE "/tmp/test.wave"
int main (int argc, char **argv)
{
AFfilehandle file;
AFfilesetup setup;
int16_t frames16[] = {14298, 392, 3923, -683, 958, -1921};
int8_t frames8[] = {55, 1, 15, -3, 3, -8};
int i, frameCount = 6;
int8_t byte;
AFframecount result;
setup = afNewFileSetup();
afInitFileFormat(setup, AF_FILE_WAVE);
afInitSampleFormat(setup, AF_DEFAULT_TRACK, AF_SAMPFMT_UNSIGNED, 8);
afInitChannels(setup, AF_DEFAULT_TRACK, 1);
file = afOpenFile(TEST_FILE, "w", setup);
if (file == AF_NULL_FILEHANDLE)
{
fprintf(stderr, "could not open file for writing\n");
exit(EXIT_FAILURE);
}
afFreeFileSetup(setup);
afSetVirtualSampleFormat(file, AF_DEFAULT_TRACK, AF_SAMPFMT_TWOSCOMP, 16);
afWriteFrames(file, AF_DEFAULT_TRACK, frames16, frameCount);
afCloseFile(file);
file = afOpenFile(TEST_FILE, "r", AF_NULL_FILESETUP);
if (file == AF_NULL_FILEHANDLE)
{
fprintf(stderr, "could not open file for reading\n");
exit(EXIT_FAILURE);
}
afSetVirtualSampleFormat(file, AF_DEFAULT_TRACK, AF_SAMPFMT_TWOSCOMP, 8);
for (i=0; i<frameCount; i++)
{
/* Read one frame. */
result = afReadFrames(file, AF_DEFAULT_TRACK, &byte, 1);
if (result != 1)
break;
/* Compare the byte read with its precalculated value. */
if (memcmp(&byte, &frames8[i], 1) != 0)
{
printf("error\n");
printf("expected %d, got %d\n", frames8[i], byte);
exit(EXIT_FAILURE);
}
else
{
#ifdef DEBUG
printf("got what was expected: %d\n", byte);
#endif
}
}
afCloseFile(file);
unlink(TEST_FILE);
exit(EXIT_SUCCESS);
}