| /* |
| * 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/call/mock/mock_rtc_event_log.h" |
| #include "webrtc/modules/bitrate_controller/send_side_bandwidth_estimation.h" |
| |
| namespace webrtc { |
| |
| void TestProbing(bool use_delay_based) { |
| MockRtcEventLog event_log; |
| SendSideBandwidthEstimation bwe(&event_log); |
| 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. |
| if (use_delay_based) { |
| bwe.UpdateDelayBasedEstimate(now_ms, kRembBps); |
| } else { |
| 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; |
| if (use_delay_based) { |
| bwe.UpdateDelayBasedEstimate(now_ms, kSecondRembBps); |
| } else { |
| bwe.UpdateReceiverEstimate(now_ms, kSecondRembBps); |
| } |
| bwe.UpdateEstimate(now_ms); |
| bitrate = 0; |
| bwe.CurrentEstimate(&bitrate, &fraction_loss, &rtt); |
| EXPECT_EQ(kRembBps, bitrate); |
| } |
| |
| TEST(SendSideBweTest, InitialRembWithProbing) { |
| TestProbing(false); |
| } |
| |
| TEST(SendSideBweTest, InitialDelayBasedBweWithProbing) { |
| TestProbing(true); |
| } |
| |
| TEST(SendSideBweTest, DoesntReapplyBitrateDecreaseWithoutFollowingRemb) { |
| MockRtcEventLog event_log; |
| EXPECT_CALL(event_log, |
| LogBwePacketLossEvent(testing::Gt(0), testing::Gt(0), 0)) |
| .Times(1); |
| SendSideBandwidthEstimation bwe(&event_log); |
| 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 += 1000; |
| 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 += 1000; |
| 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 |