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