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/*
* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/audio_coding/neteq/histogram.h"
#include <cmath>
#include <cstddef>
#include <vector>
#include "test/gtest.h"
namespace webrtc {
TEST(HistogramTest, Initialization) {
Histogram histogram(65, 32440);
histogram.Reset();
const auto& buckets = histogram.buckets();
double sum = 0.0;
for (size_t i = 0; i < buckets.size(); i++) {
EXPECT_NEAR(ldexp(std::pow(0.5, static_cast<int>(i + 1)), 30), buckets[i],
65537);
// Tolerance 65537 in Q30 corresponds to a delta of approximately 0.00006.
sum += buckets[i];
}
EXPECT_EQ(1 << 30, static_cast<int>(sum)); // Should be 1 in Q30.
}
TEST(HistogramTest, Add) {
Histogram histogram(10, 32440);
histogram.Reset();
const std::vector<int> before = histogram.buckets();
const int index = 5;
histogram.Add(index);
const std::vector<int> after = histogram.buckets();
EXPECT_GT(after[index], before[index]);
int sum = 0;
for (int bucket : after) {
sum += bucket;
}
EXPECT_EQ(1 << 30, sum);
}
TEST(HistogramTest, ForgetFactor) {
Histogram histogram(10, 32440);
histogram.Reset();
const std::vector<int> before = histogram.buckets();
const int index = 4;
histogram.Add(index);
const std::vector<int> after = histogram.buckets();
for (int i = 0; i < histogram.NumBuckets(); ++i) {
if (i != index) {
EXPECT_LT(after[i], before[i]);
}
}
}
TEST(HistogramTest, ReachSteadyStateForgetFactor) {
static constexpr int kSteadyStateForgetFactor = (1 << 15) * 0.9993;
Histogram histogram(100, kSteadyStateForgetFactor, 1.0);
histogram.Reset();
int n = (1 << 15) / ((1 << 15) - kSteadyStateForgetFactor);
for (int i = 0; i < n; ++i) {
histogram.Add(0);
}
EXPECT_EQ(histogram.forget_factor_for_testing(), kSteadyStateForgetFactor);
}
} // namespace webrtc
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