1 files changed, 57 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_processing/aec3/clockdrift_detector_unittest.cc b/third_party/libwebrtc/modules/audio_processing/aec3/clockdrift_detector_unittest.cc
new file mode 100644
index 0000000000..0f98b01d3a
--- /dev/null
+++ b/third_party/libwebrtc/modules/audio_processing/aec3/clockdrift_detector_unittest.cc
@@ -0,0 +1,57 @@
+/*
+ *  Copyright (c) 2018 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_processing/aec3/clockdrift_detector.h"
+
+#include "test/gtest.h"
+
+namespace webrtc {
+TEST(ClockdriftDetector, ClockdriftDetector) {
+  ClockdriftDetector c;
+  // No clockdrift at start.
+  EXPECT_TRUE(c.ClockdriftLevel() == ClockdriftDetector::Level::kNone);
+
+  // Monotonically increasing delay.
+  for (int i = 0; i < 100; i++)
+    c.Update(1000);
+  EXPECT_TRUE(c.ClockdriftLevel() == ClockdriftDetector::Level::kNone);
+  for (int i = 0; i < 100; i++)
+    c.Update(1001);
+  EXPECT_TRUE(c.ClockdriftLevel() == ClockdriftDetector::Level::kNone);
+  for (int i = 0; i < 100; i++)
+    c.Update(1002);
+  // Probable clockdrift.
+  EXPECT_TRUE(c.ClockdriftLevel() == ClockdriftDetector::Level::kProbable);
+  for (int i = 0; i < 100; i++)
+    c.Update(1003);
+  // Verified clockdrift.
+  EXPECT_TRUE(c.ClockdriftLevel() == ClockdriftDetector::Level::kVerified);
+
+  // Stable delay.
+  for (int i = 0; i < 10000; i++)
+    c.Update(1003);
+  // No clockdrift.
+  EXPECT_TRUE(c.ClockdriftLevel() == ClockdriftDetector::Level::kNone);
+
+  // Decreasing delay.
+  for (int i = 0; i < 100; i++)
+    c.Update(1001);
+  for (int i = 0; i < 100; i++)
+    c.Update(999);
+  // Probable clockdrift.
+  EXPECT_TRUE(c.ClockdriftLevel() == ClockdriftDetector::Level::kProbable);
+  for (int i = 0; i < 100; i++)
+    c.Update(1000);
+  for (int i = 0; i < 100; i++)
+    c.Update(998);
+  // Verified clockdrift.
+  EXPECT_TRUE(c.ClockdriftLevel() == ClockdriftDetector::Level::kVerified);
+}
+}  // namespace webrtc