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/*
* Copyright (c) 2014 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 <algorithm>
#include <vector>
#include "testing/gtest/include/gtest/gtest.h"
#include "webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h"
namespace webrtc {
TEST(SendSideBweTest, InitialRembWithProbing) {
SendSideBandwidthEstimation bwe;
bwe.SetMinMaxBitrate(100000, 1500000);
bwe.SetSendBitrate(200000);
const int kRembBps = 1000000;
const int kSecondRembBps = kRembBps + 500000;
int64_t now_ms = 0;
bwe.UpdateReceiverBlock(0, 50, 1, now_ms);
// Initial REMB applies immediately.
bwe.UpdateReceiverEstimate(now_ms, kRembBps);
bwe.UpdateEstimate(now_ms);
int bitrate;
uint8_t fraction_loss;
int64_t rtt;
bwe.CurrentEstimate(&bitrate, &fraction_loss, &rtt);
EXPECT_EQ(kRembBps, bitrate);
// Second REMB doesn't apply immediately.
now_ms += 2001;
bwe.UpdateReceiverEstimate(now_ms, kSecondRembBps);
bwe.UpdateEstimate(now_ms);
bitrate = 0;
bwe.CurrentEstimate(&bitrate, &fraction_loss, &rtt);
EXPECT_EQ(kRembBps, bitrate);
}
TEST(SendSideBweTest, DoesntReapplyBitrateDecreaseWithoutFollowingRemb) {
SendSideBandwidthEstimation bwe;
static const int kMinBitrateBps = 100000;
static const int kInitialBitrateBps = 1000000;
bwe.SetMinMaxBitrate(kMinBitrateBps, 1500000);
bwe.SetSendBitrate(kInitialBitrateBps);
static const uint8_t kFractionLoss = 128;
static const int64_t kRttMs = 50;
int64_t now_ms = 0;
int bitrate_bps;
uint8_t fraction_loss;
int64_t rtt_ms;
bwe.CurrentEstimate(&bitrate_bps, &fraction_loss, &rtt_ms);
EXPECT_EQ(kInitialBitrateBps, bitrate_bps);
EXPECT_EQ(0, fraction_loss);
EXPECT_EQ(0, rtt_ms);
// Signal heavy loss to go down in bitrate.
bwe.UpdateReceiverBlock(kFractionLoss, kRttMs, 100, now_ms);
// Trigger an update 2 seconds later to not be rate limited.
now_ms += 2000;
bwe.UpdateEstimate(now_ms);
bwe.CurrentEstimate(&bitrate_bps, &fraction_loss, &rtt_ms);
EXPECT_LT(bitrate_bps, kInitialBitrateBps);
// Verify that the obtained bitrate isn't hitting the min bitrate, or this
// test doesn't make sense. If this ever happens, update the thresholds or
// loss rates so that it doesn't hit min bitrate after one bitrate update.
EXPECT_GT(bitrate_bps, kMinBitrateBps);
EXPECT_EQ(kFractionLoss, fraction_loss);
EXPECT_EQ(kRttMs, rtt_ms);
// Triggering an update shouldn't apply further downgrade nor upgrade since
// there's no intermediate receiver block received indicating whether this is
// currently good or not.
int last_bitrate_bps = bitrate_bps;
// Trigger an update 2 seconds later to not be rate limited (but it still
// shouldn't update).
now_ms += 2000;
bwe.UpdateEstimate(now_ms);
bwe.CurrentEstimate(&bitrate_bps, &fraction_loss, &rtt_ms);
EXPECT_EQ(last_bitrate_bps, bitrate_bps);
// The old loss rate should still be applied though.
EXPECT_EQ(kFractionLoss, fraction_loss);
EXPECT_EQ(kRttMs, rtt_ms);
}
} // namespace webrtc
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