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/*
* Copyright (C) 2015-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#include "utils/rfft.h"
#include <gtest/gtest.h>
#if defined(TARGET_WINDOWS) && !defined(_USE_MATH_DEFINES)
#define _USE_MATH_DEFINES
#endif
#include <math.h>
TEST(TestRFFT, SimpleSignal)
{
const int size = 32;
const int freq1 = 5;
const int freq2[] = {1,7};
std::vector<float> input(2*size);
std::vector<float> output(size);
for (size_t i=0;i<size;++i)
{
input[2*i] = cos(freq1*2.0*M_PI*i/size);
input[2*i+1] = cos(freq2[0]*2.0*M_PI*i/size)+cos(freq2[1]*2.0*M_PI*i/size);
}
RFFT transform(size, false);
transform.calc(&input[0], &output[0]);
for (int i=0;i<size/2;++i)
{
EXPECT_NEAR(output[2*i],(i==freq1?1.0:0.0), 1e-7);
EXPECT_NEAR(output[2*i+1], ((i==freq2[0]||i==freq2[1])?1.0:0.0), 1e-7);
}
}
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