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/*
* Copyright 2015 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 "rtc_base/rate_tracker.h"
#include <cstdint>
#include "test/gtest.h"
namespace webrtc {
namespace {
const uint32_t kBucketIntervalMs = 100;
} // namespace
class RateTrackerForTest : public RateTracker {
public:
RateTrackerForTest() : RateTracker(kBucketIntervalMs, 10u), time_(0) {}
int64_t Time() const override { return time_; }
void AdvanceTime(int delta) { time_ += delta; }
private:
int64_t time_;
};
TEST(RateTrackerTest, Test30FPS) {
RateTrackerForTest tracker;
for (int i = 0; i < 300; ++i) {
tracker.AddSamples(1);
tracker.AdvanceTime(33);
if (i % 3 == 0) {
tracker.AdvanceTime(1);
}
}
EXPECT_DOUBLE_EQ(30.0, tracker.ComputeRateForInterval(50000));
}
TEST(RateTrackerTest, Test60FPS) {
RateTrackerForTest tracker;
for (int i = 0; i < 300; ++i) {
tracker.AddSamples(1);
tracker.AdvanceTime(16);
if (i % 3 != 0) {
tracker.AdvanceTime(1);
}
}
EXPECT_DOUBLE_EQ(60.0, tracker.ComputeRateForInterval(1000));
}
TEST(RateTrackerTest, TestRateTrackerBasics) {
RateTrackerForTest tracker;
EXPECT_DOUBLE_EQ(0.0, tracker.ComputeRateForInterval(1000));
// Add a sample.
tracker.AddSamples(1234);
// Advance the clock by less than one bucket interval (no rate returned).
tracker.AdvanceTime(kBucketIntervalMs - 1);
EXPECT_DOUBLE_EQ(0.0, tracker.ComputeRate());
// Advance the clock by 100 ms (one bucket interval).
tracker.AdvanceTime(1);
EXPECT_DOUBLE_EQ(12340.0, tracker.ComputeRateForInterval(1000));
EXPECT_DOUBLE_EQ(12340.0, tracker.ComputeRate());
EXPECT_EQ(1234U, tracker.TotalSampleCount());
EXPECT_DOUBLE_EQ(12340.0, tracker.ComputeTotalRate());
// Repeat.
tracker.AddSamples(1234);
tracker.AdvanceTime(100);
EXPECT_DOUBLE_EQ(12340.0, tracker.ComputeRateForInterval(1000));
EXPECT_DOUBLE_EQ(12340.0, tracker.ComputeRate());
EXPECT_EQ(1234U * 2, tracker.TotalSampleCount());
EXPECT_DOUBLE_EQ(12340.0, tracker.ComputeTotalRate());
// Advance the clock by 800 ms, so we've elapsed a full second.
// units_second should now be filled in properly.
tracker.AdvanceTime(800);
EXPECT_DOUBLE_EQ(1234.0 * 2.0, tracker.ComputeRateForInterval(1000));
EXPECT_DOUBLE_EQ(1234.0 * 2.0, tracker.ComputeRate());
EXPECT_EQ(1234U * 2, tracker.TotalSampleCount());
EXPECT_DOUBLE_EQ(1234.0 * 2.0, tracker.ComputeTotalRate());
// Poll the tracker again immediately. The reported rate should stay the same.
EXPECT_DOUBLE_EQ(1234.0 * 2.0, tracker.ComputeRateForInterval(1000));
EXPECT_DOUBLE_EQ(1234.0 * 2.0, tracker.ComputeRate());
EXPECT_EQ(1234U * 2, tracker.TotalSampleCount());
EXPECT_DOUBLE_EQ(1234.0 * 2.0, tracker.ComputeTotalRate());
// Do nothing and advance by a second. We should drop down to zero.
tracker.AdvanceTime(1000);
EXPECT_DOUBLE_EQ(0.0, tracker.ComputeRateForInterval(1000));
EXPECT_DOUBLE_EQ(0.0, tracker.ComputeRate());
EXPECT_EQ(1234U * 2, tracker.TotalSampleCount());
EXPECT_DOUBLE_EQ(1234.0, tracker.ComputeTotalRate());
// Send a bunch of data at a constant rate for 5.5 "seconds".
// We should report the rate properly.
for (int i = 0; i < 5500; i += 100) {
tracker.AddSamples(9876U);
tracker.AdvanceTime(100);
}
EXPECT_DOUBLE_EQ(9876.0 * 10.0, tracker.ComputeRateForInterval(1000));
EXPECT_DOUBLE_EQ(9876.0 * 10.0, tracker.ComputeRate());
EXPECT_EQ(1234U * 2 + 9876U * 55, tracker.TotalSampleCount());
EXPECT_DOUBLE_EQ((1234.0 * 2.0 + 9876.0 * 55.0) / 7.5,
tracker.ComputeTotalRate());
// Advance the clock by 500 ms. Since we sent nothing over this half-second,
// the reported rate should be reduced by half.
tracker.AdvanceTime(500);
EXPECT_DOUBLE_EQ(9876.0 * 5.0, tracker.ComputeRateForInterval(1000));
EXPECT_DOUBLE_EQ(9876.0 * 5.0, tracker.ComputeRate());
EXPECT_EQ(1234U * 2 + 9876U * 55, tracker.TotalSampleCount());
EXPECT_DOUBLE_EQ((1234.0 * 2.0 + 9876.0 * 55.0) / 8.0,
tracker.ComputeTotalRate());
// Rate over the last half second should be zero.
EXPECT_DOUBLE_EQ(0.0, tracker.ComputeRateForInterval(500));
}
TEST(RateTrackerTest, TestLongPeriodBetweenSamples) {
RateTrackerForTest tracker;
tracker.AddSamples(1);
tracker.AdvanceTime(1000);
EXPECT_DOUBLE_EQ(1.0, tracker.ComputeRate());
tracker.AdvanceTime(2000);
EXPECT_DOUBLE_EQ(0.0, tracker.ComputeRate());
tracker.AdvanceTime(2000);
tracker.AddSamples(1);
EXPECT_DOUBLE_EQ(1.0, tracker.ComputeRate());
}
TEST(RateTrackerTest, TestRolloff) {
RateTrackerForTest tracker;
for (int i = 0; i < 10; ++i) {
tracker.AddSamples(1U);
tracker.AdvanceTime(100);
}
EXPECT_DOUBLE_EQ(10.0, tracker.ComputeRate());
for (int i = 0; i < 10; ++i) {
tracker.AddSamples(1U);
tracker.AdvanceTime(50);
}
EXPECT_DOUBLE_EQ(15.0, tracker.ComputeRate());
EXPECT_DOUBLE_EQ(20.0, tracker.ComputeRateForInterval(500));
for (int i = 0; i < 10; ++i) {
tracker.AddSamples(1U);
tracker.AdvanceTime(50);
}
EXPECT_DOUBLE_EQ(20.0, tracker.ComputeRate());
}
TEST(RateTrackerTest, TestGetUnitSecondsAfterInitialValue) {
RateTrackerForTest tracker;
tracker.AddSamples(1234);
tracker.AdvanceTime(1000);
EXPECT_DOUBLE_EQ(1234.0, tracker.ComputeRateForInterval(1000));
}
TEST(RateTrackerTest, TestLargeNumbers) {
RateTrackerForTest tracker;
const uint64_t large_number = 0x100000000;
tracker.AddSamples(large_number);
tracker.AdvanceTime(1000);
tracker.AddSamples(large_number);
EXPECT_DOUBLE_EQ(large_number * 2, tracker.ComputeRate());
}
} // namespace webrtc
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