Make the BWE threshold adaptive.

webrtc/modules/remote_bitrate_estimator/overuse_detector_unittest.cc

 /*
  *  Copyright (c) 2012 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 <math.h>
 #include <cmath>
 #include <cstdlib>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/common_types.h"
 #include "webrtc/modules/remote_bitrate_estimator/inter_arrival.h"
 #include "webrtc/modules/remote_bitrate_estimator/overuse_detector.h"
 #include "webrtc/modules/remote_bitrate_estimator/overuse_estimator.h"
+#include "webrtc/modules/remote_bitrate_estimator/rate_statistics.h"
+#include "webrtc/modules/remote_bitrate_estimator/test/random.h"
+#include "webrtc/test/field_trial.h"
 #include "webrtc/test/testsupport/gtest_disable.h"
 
 namespace webrtc {
 namespace testing {
 
 const double kRtpTimestampToMs = 1.0 / 90.0;
 
 class OveruseDetectorTest : public ::testing::Test {
+ public:
+  OveruseDetectorTest()
+      : now_ms_(0),
+        receive_time_ms_(0),
+        rtp_timestamp_(10 * 90),
+        overuse_detector_(),
+        overuse_estimator_(new OveruseEstimator(options_)),
+        inter_arrival_(new InterArrival(5 * 90, kRtpTimestampToMs, true)),
+        random_(1234) {}
+
  protected:
-  void SetUp() {
-    srand(1234);
-    now_ms_ = 0;
-    receive_time_ms_ = 0;
-    rtp_timestamp_ = 10 * 90;
+  void SetUp() override {
     overuse_detector_.reset(new OveruseDetector(options_));
-    overuse_estimator_.reset(new OveruseEstimator(options_));
-    inter_arrival_.reset(new InterArrival(5 * 90, kRtpTimestampToMs, true));
-  }
-  // Normal Distribution.
-  #define PI  3.14159265
-  int GaussianRandom(int mean_ms, int standard_deviation_ms) {
-    // Creating a Normal distribution variable from two independent uniform
-    // variables based on the Box-Muller transform.
-    double uniform1 = (std::rand() + 1.0) / (RAND_MAX + 1.0);
-    double uniform2 = (std::rand() + 1.0) / (RAND_MAX + 1.0);
-    return static_cast<int>(mean_ms + standard_deviation_ms *
-        sqrt(-2 * log(uniform1)) * cos(2 * PI * uniform2));
   }
 
   int Run100000Samples(int packets_per_frame, size_t packet_size, int mean_ms,
                        int standard_deviation_ms) {
     int unique_overuse = 0;
     int last_overuse = -1;
     for (int i = 0; i < 100000; ++i) {
       for (int j = 0; j < packets_per_frame; ++j) {
         UpdateDetector(rtp_timestamp_, receive_time_ms_, packet_size);
       }
       rtp_timestamp_ += mean_ms * 90;
       now_ms_ += mean_ms;
-      receive_time_ms_ = std::max(receive_time_ms_,
-          now_ms_ + GaussianRandom(0, standard_deviation_ms));
+      receive_time_ms_ =
+          std::max(receive_time_ms_,
+                   now_ms_ + random_.Gaussian(0, standard_deviation_ms));
       if (kBwOverusing == overuse_detector_->State()) {
         if (last_overuse + 1 != i) {
           unique_overuse++;
         }
         last_overuse = i;
       }
     }
     return unique_overuse;
   }
 
   int RunUntilOveruse(int packets_per_frame, size_t packet_size, int mean_ms,
                       int standard_deviation_ms, int drift_per_frame_ms) {
     // Simulate a higher send pace, that is too high.
     for (int i = 0; i < 1000; ++i) {
       for (int j = 0; j < packets_per_frame; ++j) {
         UpdateDetector(rtp_timestamp_, receive_time_ms_, packet_size);
       }
       rtp_timestamp_ += mean_ms * 90;
       now_ms_ += mean_ms + drift_per_frame_ms;
-      receive_time_ms_ = std::max(receive_time_ms_,
-          now_ms_ + GaussianRandom(0, standard_deviation_ms));
+      receive_time_ms_ =
+          std::max(receive_time_ms_,
+                   now_ms_ + random_.Gaussian(0, standard_deviation_ms));
       if (kBwOverusing == overuse_detector_->State()) {
         return i + 1;
       }
     }
     return -1;
   }
 
   void UpdateDetector(uint32_t rtp_timestamp, int64_t receive_time_ms,
                       size_t packet_size) {
     uint32_t timestamp_delta;
     int64_t time_delta;
     int size_delta;
     if (inter_arrival_->ComputeDeltas(rtp_timestamp,
                                       receive_time_ms,
                                       packet_size,
                                       &timestamp_delta,
                                       &time_delta,
                                       &size_delta)) {
       double timestamp_delta_ms = timestamp_delta / 90.0;
       overuse_estimator_->Update(time_delta, timestamp_delta_ms, size_delta,
                                  overuse_detector_->State());
-      overuse_detector_->Detect(overuse_estimator_->offset(),
-                                timestamp_delta_ms,
-                                overuse_estimator_->num_of_deltas(), 0);
+      overuse_detector_->Detect(
+          overuse_estimator_->offset(), timestamp_delta_ms,
+          overuse_estimator_->num_of_deltas(), receive_time_ms);
     }
   }
 
   int64_t now_ms_;
   int64_t receive_time_ms_;
   uint32_t rtp_timestamp_;
   OverUseDetectorOptions options_;
   rtc::scoped_ptr<OveruseDetector> overuse_detector_;
   rtc::scoped_ptr<OveruseEstimator> overuse_estimator_;
   rtc::scoped_ptr<InterArrival> inter_arrival_;
+  Random random_;
 };
 
 TEST_F(OveruseDetectorTest, GaussianRandom) {
   int buckets[100];
   memset(buckets, 0, sizeof(buckets));
   for (int i = 0; i < 100000; ++i) {
-    int index = GaussianRandom(49, 10);
+    int index = random_.Gaussian(49, 10);
     if (index >= 0 && index < 100)
       buckets[index]++;
   }
   for (int n = 0; n < 100; ++n) {
     printf("Bucket n:%d, %d\n", n, buckets[n]);
   }
 }
 
 TEST_F(OveruseDetectorTest, SimpleNonOveruse30fps) {
   size_t packet_size = 1200;
@@ skipping 50 matching lines @@
   int packets_per_frame = 6;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 1;
   int sigma_ms = 0;  // No variance.
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
 
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_EQ(6, frames_until_overuse);
+  EXPECT_EQ(13, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, SimpleOveruse100kbit10fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 1;
   int frame_duration_ms = 100;
   int drift_per_frame_ms = 1;
   int sigma_ms = 0;  // No variance.
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
 
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_EQ(4, frames_until_overuse);
+  EXPECT_EQ(11, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, DISABLED_OveruseWithHighVariance100Kbit10fps) {
   uint32_t frame_duration_ms = 100;
   uint32_t drift_per_frame_ms = 10;
   uint32_t rtp_timestamp = frame_duration_ms * 90;
   size_t packet_size = 1200;
   int offset = 10;
 
   // Run 1000 samples to reach steady state.
@@ skipping 71 matching lines @@
     if (i % 2) {
       offset = rand() % 2;
       now_ms_ += frame_duration_ms - offset;
     } else {
       now_ms_ += frame_duration_ms + offset;
     }
     EXPECT_EQ(kBwNormal, overuse_detector_->State());
   }
   // Simulate a higher send pace, that is too high.
   // Total build up of 30 ms.
-  for (int j = 0; j < 5; ++j) {
+  for (int j = 0; j < 6; ++j) {
     UpdateDetector(rtp_timestamp, now_ms_, packet_size);
     UpdateDetector(rtp_timestamp, now_ms_, packet_size);
     UpdateDetector(rtp_timestamp, now_ms_, packet_size);
     UpdateDetector(rtp_timestamp, now_ms_, packet_size);
     UpdateDetector(rtp_timestamp, now_ms_, packet_size);
     UpdateDetector(rtp_timestamp, now_ms_, packet_size);
     now_ms_ += frame_duration_ms + drift_per_frame_ms * 6;
     rtp_timestamp += frame_duration_ms * 90;
     EXPECT_EQ(kBwNormal, overuse_detector_->State());
   }
   UpdateDetector(rtp_timestamp, now_ms_, packet_size);
   EXPECT_EQ(kBwOverusing, overuse_detector_->State());
 }
 
 TEST_F(OveruseDetectorTest,
        DISABLED_ON_ANDROID(LowGaussianVariance30Kbit3fps)) {
   size_t packet_size = 1200;
   int packets_per_frame = 1;
   int frame_duration_ms = 333;
   int drift_per_frame_ms = 1;
   int sigma_ms = 3;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(29, frames_until_overuse, 5);
+  EXPECT_EQ(36, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, LowGaussianVarianceFastDrift30Kbit3fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 1;
   int frame_duration_ms = 333;
   int drift_per_frame_ms = 100;
   int sigma_ms = 3;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(4, frames_until_overuse, 1);
+  EXPECT_EQ(4, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, HighGaussianVariance30Kbit3fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 1;
   int frame_duration_ms = 333;
   int drift_per_frame_ms = 1;
   int sigma_ms = 10;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(79, frames_until_overuse, 30);
+  EXPECT_EQ(119, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, HighGaussianVarianceFastDrift30Kbit3fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 1;
   int frame_duration_ms = 333;
   int drift_per_frame_ms = 100;
   int sigma_ms = 10;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(4, frames_until_overuse, 1);
+  EXPECT_EQ(5, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest,
        DISABLED_ON_ANDROID(LowGaussianVariance100Kbit5fps)) {
   size_t packet_size = 1200;
   int packets_per_frame = 2;
   int frame_duration_ms = 200;
   int drift_per_frame_ms = 1;
   int sigma_ms = 3;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(29, frames_until_overuse, 5);
+  EXPECT_EQ(35, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest,
        DISABLED_ON_ANDROID(HighGaussianVariance100Kbit5fps)) {
   size_t packet_size = 1200;
   int packets_per_frame = 2;
   int frame_duration_ms = 200;
   int drift_per_frame_ms = 1;
   int sigma_ms = 10;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(79, frames_until_overuse, 15);
+  EXPECT_EQ(115, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest,
        DISABLED_ON_ANDROID(LowGaussianVariance100Kbit10fps)) {
   size_t packet_size = 1200;
   int packets_per_frame = 1;
   int frame_duration_ms = 100;
   int drift_per_frame_ms = 1;
   int sigma_ms = 3;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(29, frames_until_overuse, 5);
+  EXPECT_EQ(30, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest,
        DISABLED_ON_ANDROID(HighGaussianVariance100Kbit10fps)) {
   size_t packet_size = 1200;
   int packets_per_frame = 1;
   int frame_duration_ms = 100;
   int drift_per_frame_ms = 1;
   int sigma_ms = 10;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(79, frames_until_overuse, 15);
+  EXPECT_EQ(98, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest,
        DISABLED_ON_ANDROID(LowGaussianVariance300Kbit30fps)) {
   size_t packet_size = 1200;
   int packets_per_frame = 1;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 1;
   int sigma_ms = 3;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(30, frames_until_overuse, 5);
+  EXPECT_EQ(36, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, LowGaussianVarianceFastDrift300Kbit30fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 1;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 10;
   int sigma_ms = 3;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(7, frames_until_overuse, 1);
+  EXPECT_EQ(8, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, HighGaussianVariance300Kbit30fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 1;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 1;
   int sigma_ms = 10;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(98, frames_until_overuse, 22);
+  EXPECT_EQ(108, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, HighGaussianVarianceFastDrift300Kbit30fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 1;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 10;
   int sigma_ms = 10;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(12, frames_until_overuse, 2);
+  EXPECT_EQ(14, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest,
        DISABLED_ON_ANDROID(LowGaussianVariance1000Kbit30fps)) {
   size_t packet_size = 1200;
   int packets_per_frame = 3;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 1;
   int sigma_ms = 3;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(30, frames_until_overuse, 5);
+  EXPECT_EQ(36, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, LowGaussianVarianceFastDrift1000Kbit30fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 3;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 10;
   int sigma_ms = 3;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(7, frames_until_overuse, 1);
+  EXPECT_EQ(8, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, HighGaussianVariance1000Kbit30fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 3;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 1;
   int sigma_ms = 10;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(98, frames_until_overuse, 22);
+  EXPECT_EQ(108, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, HighGaussianVarianceFastDrift1000Kbit30fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 3;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 10;
   int sigma_ms = 10;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(12, frames_until_overuse, 2);
+  EXPECT_EQ(14, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest,
        DISABLED_ON_ANDROID(LowGaussianVariance2000Kbit30fps)) {
   size_t packet_size = 1200;
   int packets_per_frame = 6;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 1;
   int sigma_ms = 3;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(30, frames_until_overuse, 5);
+  EXPECT_EQ(36, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, LowGaussianVarianceFastDrift2000Kbit30fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 6;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 10;
   int sigma_ms = 3;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(7, frames_until_overuse, 1);
+  EXPECT_EQ(8, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, HighGaussianVariance2000Kbit30fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 6;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 1;
   int sigma_ms = 10;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(98, frames_until_overuse, 22);
+  EXPECT_EQ(108, frames_until_overuse);
 }
 
 TEST_F(OveruseDetectorTest, HighGaussianVarianceFastDrift2000Kbit30fps) {
   size_t packet_size = 1200;
   int packets_per_frame = 6;
   int frame_duration_ms = 33;
   int drift_per_frame_ms = 10;
   int sigma_ms = 10;
   int unique_overuse = Run100000Samples(packets_per_frame, packet_size,
                                         frame_duration_ms, sigma_ms);
   EXPECT_EQ(0, unique_overuse);
   int frames_until_overuse = RunUntilOveruse(packets_per_frame, packet_size,
       frame_duration_ms, sigma_ms, drift_per_frame_ms);
-  EXPECT_NEAR(12, frames_until_overuse, 2);
+  EXPECT_EQ(14, frames_until_overuse);
+}
+
+class OveruseDetectorExperimentTest : public OveruseDetectorTest {
+ protected:
+  void SetUp() override {
+    test::InitFieldTrialsFromString(
+        "WebRTC-AdaptiveBweThreshold/Enabled-0.01,0.00018/");
+    overuse_detector_.reset(new OveruseDetector(options_));
+  }
+
+  void TearDown() override { test::InitFieldTrialsFromString(""); }
+};
+
+TEST_F(OveruseDetectorExperimentTest, ThresholdAdapts) {
+  const double kOffset = 0.21;
+  double kTsDelta = 3000.0;
+  int64_t now_ms = 0;
+  int num_deltas = 60;
+  const int kBatchLength = 10;
+
+  // Pass in a positive offset and verify it triggers overuse.
+  bool overuse_detected = false;
+  for (int i = 0; i < kBatchLength; ++i) {
+    BandwidthUsage overuse_state =
+        overuse_detector_->Detect(kOffset, kTsDelta, num_deltas, now_ms);
+    if (overuse_state == kBwOverusing) {
+      overuse_detected = true;
+    }
+    ++num_deltas;
+    now_ms += 5;
+  }
+  EXPECT_TRUE(overuse_detected);
+
+  // Force the threshold to increase by passing in a higher offset.
+  overuse_detected = false;
+  for (int i = 0; i < kBatchLength; ++i) {
+    BandwidthUsage overuse_state =
+        overuse_detector_->Detect(1.1 * kOffset, kTsDelta, num_deltas, now_ms);
+    if (overuse_state == kBwOverusing) {
+      overuse_detected = true;
+    }
+    ++num_deltas;
+    now_ms += 5;
+  }
+  EXPECT_TRUE(overuse_detected);
+
+  // Verify that the same offset as before no longer triggers overuse.
+  overuse_detected = false;
+  for (int i = 0; i < kBatchLength; ++i) {
+    BandwidthUsage overuse_state =
+        overuse_detector_->Detect(kOffset, kTsDelta, num_deltas, now_ms);
+    if (overuse_state == kBwOverusing) {
+      overuse_detected = true;
+    }
+    ++num_deltas;
+    now_ms += 5;
+  }
+  EXPECT_FALSE(overuse_detected);
+
+  // Pass in a low offset to make the threshold adapt down.
+  for (int i = 0; i < 15 * kBatchLength; ++i) {
+    BandwidthUsage overuse_state =
+        overuse_detector_->Detect(0.7 * kOffset, kTsDelta, num_deltas, now_ms);
+    if (overuse_state == kBwOverusing) {
+      overuse_detected = true;
+    }
+    ++num_deltas;
+    now_ms += 5;
+  }
+  EXPECT_FALSE(overuse_detected);
+
+  // Make sure the original offset now again triggers overuse.
+  for (int i = 0; i < kBatchLength; ++i) {
+    BandwidthUsage overuse_state =
+        overuse_detector_->Detect(kOffset, kTsDelta, num_deltas, now_ms);
+    if (overuse_state == kBwOverusing) {
+      overuse_detected = true;
+    }
+    ++num_deltas;
+    now_ms += 5;
+  }
+  EXPECT_TRUE(overuse_detected);
+}
+
+TEST_F(OveruseDetectorExperimentTest, DoesntAdaptToSpikes) {
+  const double kOffset = 1.0;
+  const double kLargeOffset = 20.0;
+  double kTsDelta = 3000.0;
+  int64_t now_ms = 0;
+  int num_deltas = 60;
+  const int kBatchLength = 10;
+  const int kShortBatchLength = 3;
+
+  // Pass in a positive offset and verify it triggers overuse.
+  bool overuse_detected = false;
+  for (int i = 0; i < kBatchLength; ++i) {
+    BandwidthUsage overuse_state =
+        overuse_detector_->Detect(kOffset, kTsDelta, num_deltas, now_ms);
+    if (overuse_state == kBwOverusing) {
+      overuse_detected = true;
+    }
+    ++num_deltas;
+    now_ms += 5;
+  }
+
+  // Pass in a large offset. This shouldn't have a too big impact on the
+  // threshold, but still trigger an overuse.
+  now_ms += 100;
+  overuse_detected = false;
+  for (int i = 0; i < kShortBatchLength; ++i) {
+    BandwidthUsage overuse_state =
+        overuse_detector_->Detect(kLargeOffset, kTsDelta, num_deltas, now_ms);
+    if (overuse_state == kBwOverusing) {
+      overuse_detected = true;
+    }
+    ++num_deltas;
+    now_ms += 5;
+  }
+  EXPECT_TRUE(overuse_detected);
+
+  // Pass in a positive normal offset and verify it still triggers.
+  overuse_detected = false;
+  for (int i = 0; i < kBatchLength; ++i) {
+    BandwidthUsage overuse_state =
+        overuse_detector_->Detect(kOffset, kTsDelta, num_deltas, now_ms);
+    if (overuse_state == kBwOverusing) {
+      overuse_detected = true;
+    }
+    ++num_deltas;
+    now_ms += 5;
+  }
+  EXPECT_TRUE(overuse_detected);
 }
 }  // namespace testing
 }  // namespace webrtc