Improve bitrate probing for the audio-only case.

webrtc/modules/pacing/alr_detector_unittest.cc

 /*
  *  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.
  */
 
@@ skipping 43 matching lines @@
   EXPECT_FALSE(alr_detector_.GetApplicationLimitedRegionStartTime());
 
   // Stay in non-ALR state when usage is close to 100%.
   SimulateOutgoingTraffic(500, 90);
   EXPECT_FALSE(alr_detector_.GetApplicationLimitedRegionStartTime());
 
   // Verify that we ALR starts when bitrate drops below 20%.
   SimulateOutgoingTraffic(500, 20);
   EXPECT_TRUE(alr_detector_.GetApplicationLimitedRegionStartTime());
 
-  // Verify that we remain in ALR state while usage is still below 50%.
-  SimulateOutgoingTraffic(500, 40);
+  // Verify that we remain in ALR state while usage is still below 70%.
+  SimulateOutgoingTraffic(500, 69);
   EXPECT_TRUE(alr_detector_.GetApplicationLimitedRegionStartTime());
 
-  // Verify that ALR ends when usage is above 50%.
-  SimulateOutgoingTraffic(500, 60);
+  // Verify that ALR ends when usage is above 70%.
+  SimulateOutgoingTraffic(500, 75);
   EXPECT_FALSE(alr_detector_.GetApplicationLimitedRegionStartTime());
 }
 
 TEST_F(AlrDetectorTest, ShortSpike) {
   // Start in non-ALR state.
   EXPECT_FALSE(alr_detector_.GetApplicationLimitedRegionStartTime());
 
   // Verify that we ALR starts when bitrate drops below 20%.
   SimulateOutgoingTraffic(500, 20);
   EXPECT_TRUE(alr_detector_.GetApplicationLimitedRegionStartTime());
 
   // Verify that we stay in ALR region even after a short bitrate spike.
   SimulateOutgoingTraffic(100, 150);
   EXPECT_TRUE(alr_detector_.GetApplicationLimitedRegionStartTime());
 
   SimulateOutgoingTraffic(200, 20);
   EXPECT_TRUE(alr_detector_.GetApplicationLimitedRegionStartTime());
 
-  // ALR ends when usage is above 50%.
-  SimulateOutgoingTraffic(500, 60);
+  // ALR ends when usage is above 70%.
+  SimulateOutgoingTraffic(500, 75);
   EXPECT_FALSE(alr_detector_.GetApplicationLimitedRegionStartTime());
 }
 
 TEST_F(AlrDetectorTest, BandwidthEstimateChanges) {
   // Start in non-ALR state.
   EXPECT_FALSE(alr_detector_.GetApplicationLimitedRegionStartTime());
 
   // ALR starts when bitrate drops below 20%.
   SimulateOutgoingTraffic(500, 20);
   EXPECT_TRUE(alr_detector_.GetApplicationLimitedRegionStartTime());
 
   // When bandwidth estimate drops the detector should stay in ALR mode and quit
   // it shortly afterwards as the sender continues sending the same amount of
   // traffic. This is necessary to ensure that ProbeController can still react
   // to the BWE drop by initiating a new probe.
   alr_detector_.SetEstimatedBitrate(kEstimatedBitrateBps / 5);
   EXPECT_TRUE(alr_detector_.GetApplicationLimitedRegionStartTime());
   SimulateOutgoingTraffic(10, 20);
   EXPECT_FALSE(alr_detector_.GetApplicationLimitedRegionStartTime());
 }
 
 }  // namespace webrtc