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Probing: Add support for exponential startup probing

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Adds support for exponentially probing the bandwidth at start-up to allow
ramp-up to real capacity of the network.

BUG=webrtc:6332
R=philipel@webrtc.org, stefan@webrtc.org

Review URL: https://codereview.webrtc.org/2235373004 .

Cr-Commit-Position: refs/heads/master@{#14189}
This commit is contained in:
Irfan Sheriff
2016-09-12 12:28:54 -07:00
parent a421ddd60e
commit b2540bb99f
25 changed files with 353 additions and 112 deletions
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82
webrtc/modules/congestion_controller/probe_controller_unittest.cc Normal file
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/*
* Copyright (c) 2016 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 <memory>
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "webrtc/base/logging.h"
#include "webrtc/modules/congestion_controller/probe_controller.h"
#include "webrtc/modules/pacing/mock/mock_paced_sender.h"
#include "webrtc/system_wrappers/include/clock.h"
using testing::_;
using testing::AtLeast;
using testing::NiceMock;
namespace webrtc {
namespace test {
namespace {
constexpr int kMinBitrateBps = 100;
constexpr int kStartBitrateBps = 300;
constexpr int kMaxBitrateBps = 1000;
} // namespace
class ProbeControllerTest : public ::testing::Test {
protected:
ProbeControllerTest() : clock_(0) {
probe_controller_.reset(new ProbeController(&pacer_, &clock_));
}
~ProbeControllerTest() override {}
SimulatedClock clock_;
NiceMock<MockPacedSender> pacer_;
std::unique_ptr<ProbeController> probe_controller_;
};
TEST_F(ProbeControllerTest, InitiatesProbingAtStart) {
EXPECT_CALL(pacer_, CreateProbeCluster(_, _)).Times(AtLeast(2));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
}
TEST_F(ProbeControllerTest, InitiatesProbingOnMaxBitrateIncrease) {
EXPECT_CALL(pacer_, CreateProbeCluster(_, _)).Times(AtLeast(2));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
clock_.AdvanceTimeMilliseconds(25);
probe_controller_->SetEstimatedBitrate(kStartBitrateBps);
EXPECT_CALL(pacer_, CreateProbeCluster(kMaxBitrateBps + 100, _));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps + 100);
}
TEST_F(ProbeControllerTest, TestExponentialProbing) {
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
EXPECT_CALL(pacer_, CreateProbeCluster(2 * 1800, _));
probe_controller_->SetEstimatedBitrate(1800);
}
TEST_F(ProbeControllerTest, TestExponentialProbingTimeout) {
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
// Advance far enough to cause a time out in waiting for probing result.
clock_.AdvanceTimeMilliseconds(5000);
EXPECT_CALL(pacer_, CreateProbeCluster(2 * 1800, _)).Times(0);
probe_controller_->SetEstimatedBitrate(1800);
}
} // namespace test
} // namespace webrtc