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/*
Audio File Library
Copyright (C) 2003, 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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
testchannelmatrix.c
This program tests the channel matrix functionality of virtual
sample format conversion in the Audio File Library.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <audiofile.h>
#include "TestUtilities.h"
static char *sTestFileName;
const short samples[] = {300, -300, 515, -515, 2315, -2315, 9154, -9154};
#define SAMPLE_COUNT (sizeof (samples) / sizeof (short))
#define CHANNEL_COUNT 2
void cleanup (void)
{
if (sTestFileName)
{
unlink(sTestFileName);
free(sTestFileName);
}
}
void ensure (int condition, const char *message)
{
if (!condition)
{
printf("%s.\n", message);
cleanup();
exit(EXIT_FAILURE);
}
}
int main (void)
{
AFfilesetup setup;
AFfilehandle file;
int framesWritten, framesRead;
const int frameCount = SAMPLE_COUNT / CHANNEL_COUNT;
short readsamples[SAMPLE_COUNT];
int i;
int sampleFormat, sampleWidth;
setup = afNewFileSetup();
afInitChannels(setup, AF_DEFAULT_TRACK, CHANNEL_COUNT);
afInitFileFormat(setup, AF_FILE_AIFFC);
/* Write stereo data to test file. */
ensure(createTemporaryFile("testchannelmatrix", &sTestFileName),
"could not create temporary file");
file = afOpenFile(sTestFileName, "w", setup);
ensure(file != AF_NULL_FILEHANDLE, "could not open file for writing");
afFreeFileSetup(setup);
framesWritten = afWriteFrames(file, AF_DEFAULT_TRACK, samples,
frameCount);
ensure(framesWritten == frameCount,
"number of frames written doesn't match "
"number of frames requested");
ensure(afCloseFile(file) == 0, "error closing file");
/*
Open the test file and read stereo data mixed down to a
single channel. The default channel matrix for one
file channel and two virtual channels is {0.5, 0.5},
and since each odd sample is the inverse of the
corresponding even sample, the data read should be all
zeros.
*/
file = afOpenFile(sTestFileName, "r", AF_NULL_FILESETUP);
ensure(file != AF_NULL_FILEHANDLE, "could not open file for reading");
ensure(afGetChannels(file, AF_DEFAULT_TRACK) == 2,
"file doesn't have exactly two channels");
afGetSampleFormat(file, AF_DEFAULT_TRACK, &sampleFormat, &sampleWidth);
ensure(sampleFormat == AF_SAMPFMT_TWOSCOMP && sampleWidth == 16,
"file doesn't contain 16-bit two's complement data");
ensure(afGetFileFormat(file, NULL) == AF_FILE_AIFFC,
"file format doesn't match format requested");
afSetVirtualChannels(file, AF_DEFAULT_TRACK, 1);
framesRead = afReadFrames(file, AF_DEFAULT_TRACK, readsamples,
frameCount);
ensure(framesRead == frameCount, "number of frames read does not match number of frames requested");
for (i=0; i<SAMPLE_COUNT/CHANNEL_COUNT; i++)
{
ensure(readsamples[i] == 0,
"data written to file is not as expected");
}
ensure(afCloseFile(file) == 0, "error closing file");
cleanup();
exit(EXIT_SUCCESS);
}
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