blob: 132c0b13a7954f64d421ef72f03f17bd2c6d714d [file] [log] [blame]
/*
* Copyright 2011 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 <limits.h>
#include "webrtc/base/bandwidthsmoother.h"
#include "webrtc/base/gunit.h"
namespace rtc {
static const int kTimeBetweenIncrease = 10;
static const double kPercentIncrease = 1.1;
static const size_t kSamplesCountToAverage = 2;
static const double kMinSampleCountPercent = 1.0;
TEST(BandwidthSmootherTest, TestSampleIncrease) {
BandwidthSmoother mon(1000, // initial_bandwidth_guess
kTimeBetweenIncrease,
kPercentIncrease,
kSamplesCountToAverage,
kMinSampleCountPercent);
int bandwidth_sample = 1000;
EXPECT_EQ(bandwidth_sample, mon.get_bandwidth_estimation());
bandwidth_sample =
static_cast<int>(bandwidth_sample * kPercentIncrease);
EXPECT_FALSE(mon.Sample(9, bandwidth_sample));
EXPECT_TRUE(mon.Sample(10, bandwidth_sample));
EXPECT_EQ(bandwidth_sample, mon.get_bandwidth_estimation());
int next_expected_est =
static_cast<int>(bandwidth_sample * kPercentIncrease);
bandwidth_sample *= 2;
EXPECT_TRUE(mon.Sample(20, bandwidth_sample));
EXPECT_EQ(next_expected_est, mon.get_bandwidth_estimation());
}
TEST(BandwidthSmootherTest, TestSampleIncreaseFromZero) {
BandwidthSmoother mon(0, // initial_bandwidth_guess
kTimeBetweenIncrease,
kPercentIncrease,
kSamplesCountToAverage,
kMinSampleCountPercent);
const int kBandwidthSample = 1000;
EXPECT_EQ(0, mon.get_bandwidth_estimation());
EXPECT_FALSE(mon.Sample(9, kBandwidthSample));
EXPECT_TRUE(mon.Sample(10, kBandwidthSample));
EXPECT_EQ(kBandwidthSample, mon.get_bandwidth_estimation());
}
TEST(BandwidthSmootherTest, TestSampleDecrease) {
BandwidthSmoother mon(1000, // initial_bandwidth_guess
kTimeBetweenIncrease,
kPercentIncrease,
kSamplesCountToAverage,
kMinSampleCountPercent);
const int kBandwidthSample = 999;
EXPECT_EQ(1000, mon.get_bandwidth_estimation());
EXPECT_FALSE(mon.Sample(1, kBandwidthSample));
EXPECT_EQ(1000, mon.get_bandwidth_estimation());
EXPECT_TRUE(mon.Sample(2, kBandwidthSample));
EXPECT_EQ(kBandwidthSample, mon.get_bandwidth_estimation());
}
TEST(BandwidthSmootherTest, TestSampleTooFewSamples) {
BandwidthSmoother mon(1000, // initial_bandwidth_guess
kTimeBetweenIncrease,
kPercentIncrease,
10, // 10 samples.
0.5); // 5 min samples.
const int kBandwidthSample = 500;
EXPECT_EQ(1000, mon.get_bandwidth_estimation());
EXPECT_FALSE(mon.Sample(1, kBandwidthSample));
EXPECT_FALSE(mon.Sample(2, kBandwidthSample));
EXPECT_FALSE(mon.Sample(3, kBandwidthSample));
EXPECT_FALSE(mon.Sample(4, kBandwidthSample));
EXPECT_EQ(1000, mon.get_bandwidth_estimation());
EXPECT_TRUE(mon.Sample(5, kBandwidthSample));
EXPECT_EQ(kBandwidthSample, mon.get_bandwidth_estimation());
}
TEST(BandwidthSmootherTest, TestSampleRollover) {
const int kHugeBandwidth = 2000000000; // > INT_MAX/1.1
BandwidthSmoother mon(kHugeBandwidth,
kTimeBetweenIncrease,
kPercentIncrease,
kSamplesCountToAverage,
kMinSampleCountPercent);
EXPECT_FALSE(mon.Sample(10, INT_MAX));
EXPECT_FALSE(mon.Sample(11, INT_MAX));
EXPECT_EQ(kHugeBandwidth, mon.get_bandwidth_estimation());
}
TEST(BandwidthSmootherTest, TestSampleNegative) {
BandwidthSmoother mon(1000, // initial_bandwidth_guess
kTimeBetweenIncrease,
kPercentIncrease,
kSamplesCountToAverage,
kMinSampleCountPercent);
EXPECT_FALSE(mon.Sample(10, -1));
EXPECT_FALSE(mon.Sample(11, -1));
EXPECT_EQ(1000, mon.get_bandwidth_estimation());
}
} // namespace rtc