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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(WEB_AUDIO)
#include <WebCore/AudioParamTimeline.h>
#include <cmath>
using namespace WebCore;
using WTF::Seconds;
static float expInterp(float v1, float v2, Seconds t, Seconds t1, Seconds t2)
{
double ratio = static_cast<double>(v2) / static_cast<double>(v1);
double alpha = (t - t1) / (t2 - t1);
return static_cast<float>(static_cast<double>(v1) * std::pow(ratio, alpha));
}
TEST(WebCore, AudioParamTimeline_OppositeSigns_PositiveToNegative)
{
const float value1 = 2.0f;
const float value2 = -1.0f;
const Seconds time1 { 0.0 };
const Seconds time2 { 1.0 };
float r = AudioParamTimeline::exponentialRampAtTime(Seconds { 0.5 }, value1, time1, value2, time2);
EXPECT_FLOAT_EQ(r, value1);
}
TEST(WebCore, AudioParamTimeline_OppositeSigns_NegativeToPositive)
{
const float value1 = -5.0f;
const float value2 = 3.0f;
const Seconds time1 { 0.0 };
const Seconds time2 { 1.0 };
float r = AudioParamTimeline::exponentialRampAtTime(Seconds { 0.3 }, value1, time1, value2, time2);
EXPECT_FLOAT_EQ(r, value1);
}
TEST(WebCore, AudioParamTimeline_OppositeSigns_MultipleTimes)
{
const float value1 = 4.0f;
const float value2 = -2.0f;
const Seconds time1 { 0.0 };
const Seconds time2 { 2.0 };
EXPECT_FLOAT_EQ(AudioParamTimeline::exponentialRampAtTime(time1, value1, time1, value2, time2), value1);
EXPECT_FLOAT_EQ(AudioParamTimeline::exponentialRampAtTime(Seconds { 0.5 }, value1, time1, value2, time2), value1);
EXPECT_FLOAT_EQ(AudioParamTimeline::exponentialRampAtTime(Seconds { 1.5 }, value1, time1, value2, time2), value1);
EXPECT_FLOAT_EQ(AudioParamTimeline::exponentialRampAtTime(time2, value1, time1, value2, time2), value1);
}
TEST(WebCore, AudioParamTimeline_OppositeSigns_SmallMagnitudes)
{
const float value1 = 0.001f;
const float value2 = -0.001f;
const Seconds time1 { 0.0 };
const Seconds time2 { 1.0 };
float r = AudioParamTimeline::exponentialRampAtTime(Seconds { 0.7 }, value1, time1, value2, time2);
EXPECT_NEAR(r, value1, 1e-7f);
}
TEST(WebCore, AudioParamTimeline_OppositeSigns_LargeMagnitudes)
{
const float value1 = -1000.0f;
const float value2 = 500.0f;
const Seconds time1 { 0.5 };
const Seconds time2 { 1.5 };
float r = AudioParamTimeline::exponentialRampAtTime(Seconds { 0.9 }, value1, time1, value2, time2);
EXPECT_FLOAT_EQ(r, value1);
}
TEST(WebCore, AudioParamTimeline_SameSign_PositiveFollowsExponential)
{
const float value1 = 1.0f;
const float value2 = 4.0f;
const Seconds time1 { 0.0 };
const Seconds time2 { 1.0 };
const Seconds t { 0.5 };
float r = AudioParamTimeline::exponentialRampAtTime(t, value1, time1, value2, time2);
float expected = expInterp(value1, value2, t, time1, time2);
EXPECT_NEAR(r, expected, 1e-3f);
}
TEST(WebCore, AudioParamTimeline_SameSign_NegativeFollowsExponential)
{
const float value1 = -2.0f;
const float value2 = -8.0f;
const Seconds time1 { 0.0 };
const Seconds time2 { 1.0 };
const Seconds t { 0.5 };
float r = AudioParamTimeline::exponentialRampAtTime(t, value1, time1, value2, time2);
float expected = expInterp(value1, value2, t, time1, time2);
EXPECT_NEAR(r, expected, 1e-3f);
}
#endif // ENABLE(WEB_AUDIO)
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