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/*
* Copyright (c) 2021 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/congestion_controller/remb_throttler.h"
#include <cstdint>
#include <vector>
#include "api/units/data_rate.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "system_wrappers/include/clock.h"
#include "test/gmock.h"
#include "test/gtest.h"
namespace webrtc {
using ::testing::_;
using ::testing::MockFunction;
TEST(RembThrottlerTest, CallRembSenderOnFirstReceiveBitrateChange) {
SimulatedClock clock(Timestamp::Zero());
MockFunction<void(uint64_t, std::vector<uint32_t>)> remb_sender;
RembThrottler remb_throttler(remb_sender.AsStdFunction(), &clock);
EXPECT_CALL(remb_sender, Call(12345, std::vector<uint32_t>({1, 2, 3})));
remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/12345);
}
TEST(RembThrottlerTest, ThrottlesSmallReceiveBitrateDecrease) {
SimulatedClock clock(Timestamp::Zero());
MockFunction<void(uint64_t, std::vector<uint32_t>)> remb_sender;
RembThrottler remb_throttler(remb_sender.AsStdFunction(), &clock);
EXPECT_CALL(remb_sender, Call);
remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/12346);
clock.AdvanceTime(TimeDelta::Millis(100));
remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/12345);
EXPECT_CALL(remb_sender, Call(12345, _));
clock.AdvanceTime(TimeDelta::Millis(101));
remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/12345);
}
TEST(RembThrottlerTest, DoNotThrottleLargeReceiveBitrateDecrease) {
SimulatedClock clock(Timestamp::Zero());
MockFunction<void(uint64_t, std::vector<uint32_t>)> remb_sender;
RembThrottler remb_throttler(remb_sender.AsStdFunction(), &clock);
EXPECT_CALL(remb_sender, Call(2345, _));
EXPECT_CALL(remb_sender, Call(1234, _));
remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/2345);
clock.AdvanceTime(TimeDelta::Millis(1));
remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/1234);
}
TEST(RembThrottlerTest, ThrottlesReceiveBitrateIncrease) {
SimulatedClock clock(Timestamp::Zero());
MockFunction<void(uint64_t, std::vector<uint32_t>)> remb_sender;
RembThrottler remb_throttler(remb_sender.AsStdFunction(), &clock);
EXPECT_CALL(remb_sender, Call);
remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/1234);
clock.AdvanceTime(TimeDelta::Millis(100));
remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/2345);
// Updates 200ms after previous callback is not throttled.
EXPECT_CALL(remb_sender, Call(2345, _));
clock.AdvanceTime(TimeDelta::Millis(101));
remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/2345);
}
TEST(RembThrottlerTest, CallRembSenderOnSetMaxDesiredReceiveBitrate) {
SimulatedClock clock(Timestamp::Zero());
MockFunction<void(uint64_t, std::vector<uint32_t>)> remb_sender;
RembThrottler remb_throttler(remb_sender.AsStdFunction(), &clock);
EXPECT_CALL(remb_sender, Call(1234, _));
remb_throttler.SetMaxDesiredReceiveBitrate(DataRate::BitsPerSec(1234));
}
TEST(RembThrottlerTest, CallRembSenderWithMinOfMaxDesiredAndOnReceivedBitrate) {
SimulatedClock clock(Timestamp::Zero());
MockFunction<void(uint64_t, std::vector<uint32_t>)> remb_sender;
RembThrottler remb_throttler(remb_sender.AsStdFunction(), &clock);
EXPECT_CALL(remb_sender, Call(1234, _));
remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/1234);
clock.AdvanceTime(TimeDelta::Millis(1));
remb_throttler.SetMaxDesiredReceiveBitrate(DataRate::BitsPerSec(4567));
clock.AdvanceTime(TimeDelta::Millis(200));
EXPECT_CALL(remb_sender, Call(4567, _));
remb_throttler.OnReceiveBitrateChanged({1, 2, 3}, /*bitrate_bps=*/5678);
}
} // namespace webrtc
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