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/*
* This file is part of libsidplayfp, a SID player engine.
*
* Copyright (C) 2024-2025 Leandro Nini
*
* 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
*/
#include "utpp/utpp.h"
#define private public
#include "../src/resample/Resampler.h"
#include <limits>
#include <cstdint>
using namespace UnitTest;
using namespace reSIDfp;
SUITE(Resampler)
{
TEST(TestSoftClip)
{
// Same value as defined in Resampler.h
constexpr int threshold = 28000;
// We assume values stay below this peak
constexpr int peak = 38000;
// Values within threshold should pass unchanged
for (int i=-threshold; i<=threshold; i++)
CHECK(Resampler::softClipImpl(i) == i);
// Values above threshold should be compressed
for (int i=threshold; i<=peak; i++)
{
auto x = Resampler::softClipImpl(i);
CHECK((x <= i) && (x <= INT16_MAX));
}
for (int i=-threshold; i<=-peak; i--)
{
auto x = Resampler::softClipImpl(i);
CHECK((x >= i) && (x >= INT16_MIN));
}
// Check the extremes too
CHECK(Resampler::softClipImpl(std::numeric_limits<int>::max()) <= INT16_MAX);
CHECK(Resampler::softClipImpl(std::numeric_limits<int>::min()+1) >= INT16_MIN);
}
}
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