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/*
Copyright 2018 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS-IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "dsp/occlusion_calculator.h"
#include <algorithm>
#include "third_party/googletest/googletest/include/gtest/gtest.h"
#include "base/constants_and_types.h"
#include "base/misc_math.h"
namespace vraudio {
namespace {
// Spherical coordinates of listener relative to source.
const float kListenerAheadRads[2] = {0.0f, 0.0f};
const float kListenerBesideRads[2] = {0.0f, static_cast<float>(M_PI_2)};
const float kListenerAboveAndAheadRads[2] = {static_cast<float>(M_PI_4), 0.0f};
// Test case data structure.
struct DirectivityTestParams {
// Directivity function's alpha weighting.
const float alpha;
// Directivity function's order.
const float order;
// Spherical angle of the listener relative to the source.
const float* relative_spherical_angle;
// Expected value produced by the directivity function for the given input
// parameters.
const float expected_directivity;
};
// This test runs through a series of parametrized test cases and checks that
// the directivity value calculated according to those parameters is correct.
class DirectivityCalculatorParametrizedTest
: public testing::Test,
public testing::WithParamInterface<DirectivityTestParams> {};
// Parametrized test which verifies that the directivity value calculated from
// the test parameters matches the expected value supplied.
TEST_P(DirectivityCalculatorParametrizedTest, CalculateDirectivityTest) {
// Test parameters.
const DirectivityTestParams test_params = GetParam();
// Construct test angle.
const float elevation_rad = test_params.relative_spherical_angle[0];
const float azimuth_rad = test_params.relative_spherical_angle[1];
SphericalAngle test_angle(elevation_rad, azimuth_rad);
// Calculate directivity.
const float directivity =
CalculateDirectivity(test_params.alpha, test_params.order, test_angle);
// Check calculated directivity.
EXPECT_NEAR(test_params.expected_directivity, directivity, kEpsilonFloat);
}
// Test parameters, according to struct |DirectivityParams|.
DirectivityTestParams test_cases[] = {
// Omnidirectional.
{0.0f, 1.0f, &(kListenerAheadRads[0]), 1.0f},
{0.0f, 1.0f, &(kListenerBesideRads[0]), 1.0f},
{0.0f, 1.0f, &(kListenerAboveAndAheadRads[0]), 1.0f},
{0.0f, 2.0f, &(kListenerAboveAndAheadRads[0]), 1.0f},
{0.0f, 0.5f, &(kListenerAboveAndAheadRads[0]), 1.0f},
// Hypocardioid.
{0.25f, 1.0f, &(kListenerAheadRads[0]), 1.0f},
{0.25f, 1.0f, &(kListenerBesideRads[0]), 0.75f},
{0.25f, 1.0f, &(kListenerAboveAndAheadRads[0]), 0.926777f},
{0.25f, 2.0f, &(kListenerAboveAndAheadRads[0]), 0.858915f},
{0.25f, 0.5f, &(kListenerAboveAndAheadRads[0]), 0.926777f},
// Cardioid.
{0.5f, 1.0f, &(kListenerAheadRads[0]), 1.0f},
{0.5f, 1.0f, &(kListenerBesideRads[0]), 0.5f},
{0.5f, 1.0f, &(kListenerAboveAndAheadRads[0]), 0.853553f},
{0.5f, 2.0f, &(kListenerAboveAndAheadRads[0]), 0.728553f},
// Hypercardioid.
{0.75f, 1.0f, &(kListenerAheadRads[0]), 1.0f},
{0.75f, 1.0f, &(kListenerBesideRads[0]), 0.25f},
{0.75f, 1.0f, &(kListenerAboveAndAheadRads[0]), 0.780330f},
{0.75f, 2.0f, &(kListenerAboveAndAheadRads[0]), 0.608915f},
{0.75f, 0.5f, &(kListenerAboveAndAheadRads[0]), 0.780330f},
// Dipole.
{1.0f, 1.0f, &(kListenerAheadRads[0]), 1.0f},
{1.0f, 1.0f, &(kListenerBesideRads[0]), 0.0f},
{1.0f, 1.0f, &(kListenerAboveAndAheadRads[0]), 0.707107f},
{1.0f, 2.0f, &(kListenerAboveAndAheadRads[0]), 0.5f},
{1.0f, 0.5f, &(kListenerAboveAndAheadRads[0]), 0.707107f}};
INSTANTIATE_TEST_CASE_P(Instance, DirectivityCalculatorParametrizedTest,
testing::ValuesIn(test_cases));
TEST(DirectivityTest, CalculateOcclusionFilterCoefficientTest) {
// When there is no occlusion (occlusion == 0) expect the filter coefficient
// to be 1 - directivity.
const std::vector<float> directivities = {0.0f, 0.3f, 0.5f, 0.7f, 0.9f, 1.5f};
for (size_t i = 0; i < directivities.size() - 1; ++i) {
const float coefficient =
CalculateOcclusionFilterCoefficient(directivities[i], 0.0f);
EXPECT_EQ(1.0f - directivities[i], coefficient);
}
// Ensure the minimum value returned is 0.
const float coefficient =
CalculateOcclusionFilterCoefficient(directivities.back(), 0.0f);
EXPECT_EQ(0.0f, coefficient);
}
TEST(OcclusionTest, CalculateOcclusionFilterCoefficientTest) {
// When there is no effect on directivity, expect the filter coefficient
// to be 1 / (x + 1)^4 where x is the occlusion intensity.
const std::vector<float> occlusions = {0.01f, 0.1f, 1.0f, 10.0f, 100.0f};
std::vector<float> expected_coefficients = occlusions;
// Calculate 1 / (x + 1)^4 where x is the occlusion intensity.
std::for_each(expected_coefficients.begin(), expected_coefficients.end(),
[](float& n) { n = 1.0f - 1.0f / IntegerPow(n + 1.0f, 4); });
for (size_t i = 0; i < expected_coefficients.size(); ++i) {
const float coefficient =
CalculateOcclusionFilterCoefficient(1.0f, occlusions[i]);
EXPECT_EQ(expected_coefficients[i], coefficient);
}
}
} // namespace
} // namespace vraudio
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