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/*
Audio File Library
Copyright (C) 2001, 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.
*/
/*
floatto24.c
This program creates a BICSF floating-point sound file and then
reads the sample data back as 24-bit data (i.e. 32-bit integers
with the high 8 bits equal to the sign extension of the lower
24 bits).
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <audiofile.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#define TEST_FILE "/tmp/test.sfXXXXXX"
char *real_test_file;
/*
When converted to samples with width 24 bits, the samples
should have the following values:
*/
const float samples[] =
{
0,
0.5,
-0.5,
1,
-1,
-0.25,
0.25,
0.75,
-0.75
};
const int referenceConvertedSamples[] =
{
0,
4194304, // = 2^23 * 0.5
-4194304, // = 2^23 * -0.5
8388607, // = 2^23 - 1
-8388608, // = 2^23 * -1
-2097152, // = 2^23 * -0.25
2097152, // = 2^23 * 0.25
6291456, // = 2^23 * 0.75
-6291456 // = 2^23 * -0.75
};
const int frameCount = sizeof (samples) / sizeof (samples[0]);
int main (int argc, char **argv)
{
AFfilesetup setup;
if ((setup = afNewFileSetup()) == AF_NULL_FILESETUP)
{
fprintf(stderr, "Could not allocate file setup.\n");
exit(EXIT_FAILURE);
}
afInitFileFormat(setup, AF_FILE_IRCAM);
afInitChannels(setup, AF_DEFAULT_TRACK, 1);
afInitSampleFormat(setup, AF_DEFAULT_TRACK, AF_SAMPFMT_FLOAT, 32);
real_test_file = malloc(sizeof(TEST_FILE));
strcpy(real_test_file, TEST_FILE);
int tmp = mkstemp(real_test_file);
AFfilehandle file = afOpenFile(real_test_file, "w", setup);
if (file == AF_NULL_FILEHANDLE)
{
printf("could not open file for writing\n");
exit(EXIT_FAILURE);
}
afFreeFileSetup(setup);
AFframecount framesWritten = afWriteFrames(file, AF_DEFAULT_TRACK, samples,
frameCount);
if (framesWritten != frameCount)
{
fprintf(stderr, "Wrong number of frames read.\n");
exit(EXIT_FAILURE);
}
if (afCloseFile(file) != 0)
{
fprintf(stderr, "Closing file returned non-zero status.\n");
exit(EXIT_FAILURE);
}
file = afOpenFile(real_test_file, "r", AF_NULL_FILESETUP);
if (file == AF_NULL_FILEHANDLE)
{
fprintf(stderr, "Could not open file for writing.\n");
exit(EXIT_FAILURE);
}
if (afSetVirtualSampleFormat(file, AF_DEFAULT_TRACK,
AF_SAMPFMT_TWOSCOMP, 24) != 0)
{
fprintf(stderr, "afSetVirtualSampleFormat returned non-zero status.\n");
exit(EXIT_FAILURE);
}
int readSamples[frameCount];
for (int i=0; i<frameCount; i++)
readSamples[i] = -1000 - i;
AFframecount framesRead = afReadFrames(file, AF_DEFAULT_TRACK, readSamples,
frameCount);
if (framesRead != frameCount)
{
fprintf(stderr, "Wrong number of frames read.\n");
exit(EXIT_FAILURE);
}
for (int i=0; i<framesRead; i++)
{
#ifdef DEBUG
printf("[%d] = %d\n", i, readSamples[i]);
#endif
if (readSamples[i] == -1000 - i)
{
fprintf(stderr, "Data in destination array untouched.\n");
exit(EXIT_FAILURE);
}
/*
Ensure that the high-order 8 bits represent
sign extension: only 0x00 (+) or 0xff (-) is
valid.
*/
if ((readSamples[i] & 0xff000000) != 0x000000 &&
(readSamples[i] & 0xff000000) != 0xff000000)
{
fprintf(stderr, "Data is not within range of "
"{-2^23, ..., 2^23-1}.\n");
exit(EXIT_FAILURE);
}
if (readSamples[i] != referenceConvertedSamples[i])
{
fprintf(stderr, "Data doesn't match reference data.\n");
exit(EXIT_FAILURE);
}
}
if (afCloseFile(file) != 0)
{
fprintf(stderr, "Closing file returned non-zero status.\n");
exit(EXIT_FAILURE);
}
unlink(real_test_file);
exit(EXIT_SUCCESS);
}
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