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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/audio_coding/neteq/reorder_optimizer.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
constexpr int kForgetFactor = 32745; // 0.9993 in Q15.
constexpr int kMsPerLossPercent = 20;
constexpr int kStartForgetWeight = 1;
} // namespace
TEST(ReorderOptimizerTest, OnlyIncreaseDelayForReorderedPackets) {
ReorderOptimizer reorder_optimizer(kForgetFactor, kMsPerLossPercent,
kStartForgetWeight);
EXPECT_FALSE(reorder_optimizer.GetOptimalDelayMs());
// Delay should not increase for in-order packets.
reorder_optimizer.Update(60, /*reordered=*/false, 0);
EXPECT_EQ(reorder_optimizer.GetOptimalDelayMs(), 20);
reorder_optimizer.Update(100, /*reordered=*/false, 0);
EXPECT_EQ(reorder_optimizer.GetOptimalDelayMs(), 20);
reorder_optimizer.Update(80, /*reordered=*/true, 0);
EXPECT_EQ(reorder_optimizer.GetOptimalDelayMs(), 100);
}
TEST(ReorderOptimizerTest, AvoidIncreasingDelayWhenProbabilityIsLow) {
ReorderOptimizer reorder_optimizer(kForgetFactor, kMsPerLossPercent,
kStartForgetWeight);
reorder_optimizer.Update(40, /*reordered=*/true, 0);
reorder_optimizer.Update(40, /*reordered=*/true, 0);
reorder_optimizer.Update(40, /*reordered=*/true, 0);
EXPECT_EQ(reorder_optimizer.GetOptimalDelayMs(), 60);
// The cost of the delay is too high relative the probability.
reorder_optimizer.Update(600, /*reordered=*/true, 0);
EXPECT_EQ(reorder_optimizer.GetOptimalDelayMs(), 60);
}
TEST(ReorderOptimizerTest, BaseDelayIsSubtractedFromCost) {
constexpr int kBaseDelayMs = 200;
ReorderOptimizer reorder_optimizer(kForgetFactor, kMsPerLossPercent,
kStartForgetWeight);
reorder_optimizer.Update(40, /*reordered=*/true, kBaseDelayMs);
reorder_optimizer.Update(40, /*reordered=*/true, kBaseDelayMs);
reorder_optimizer.Update(40, /*reordered=*/true, kBaseDelayMs);
EXPECT_EQ(reorder_optimizer.GetOptimalDelayMs(), 60);
// The cost of the delay is too high relative the probability.
reorder_optimizer.Update(600, /*reordered=*/true, kBaseDelayMs);
EXPECT_EQ(reorder_optimizer.GetOptimalDelayMs(), 620);
}
} // namespace webrtc
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