1 files changed, 58 insertions, 0 deletions
diff --git a/modules/rtp_rtcp/source/capture_clock_offset_updater_unittest.cc b/modules/rtp_rtcp/source/capture_clock_offset_updater_unittest.cc
new file mode 100644
index 0000000000..43e1dd1379
--- /dev/null
+++ b/modules/rtp_rtcp/source/capture_clock_offset_updater_unittest.cc
@@ -0,0 +1,58 @@
+/*
+ *  Copyright (c) 2021 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/rtp_rtcp/source/capture_clock_offset_updater.h"
+
+#include "system_wrappers/include/ntp_time.h"
+#include "test/gmock.h"
+#include "test/gtest.h"
+
+namespace webrtc {
+
+TEST(AbsoluteCaptureTimeReceiverTest,
+     SkipEstimatedCaptureClockOffsetIfRemoteToLocalClockOffsetIsUnknown) {
+  static const absl::optional<int64_t> kRemoteCaptureClockOffset =
+      Int64MsToQ32x32(-350);
+  CaptureClockOffsetUpdater updater;
+  updater.SetRemoteToLocalClockOffset(absl::nullopt);
+  EXPECT_EQ(
+      updater.AdjustEstimatedCaptureClockOffset(kRemoteCaptureClockOffset),
+      absl::nullopt);
+}
+
+TEST(AbsoluteCaptureTimeReceiverTest,
+     SkipEstimatedCaptureClockOffsetIfRemoteCaptureClockOffsetIsUnknown) {
+  static const absl::optional<int64_t> kCaptureClockOffsetNull = absl::nullopt;
+  CaptureClockOffsetUpdater updater;
+  updater.SetRemoteToLocalClockOffset(0);
+  EXPECT_EQ(updater.AdjustEstimatedCaptureClockOffset(kCaptureClockOffsetNull),
+            kCaptureClockOffsetNull);
+
+  static const absl::optional<int64_t> kRemoteCaptureClockOffset =
+      Int64MsToQ32x32(-350);
+  EXPECT_EQ(
+      updater.AdjustEstimatedCaptureClockOffset(kRemoteCaptureClockOffset),
+      kRemoteCaptureClockOffset);
+}
+
+TEST(AbsoluteCaptureTimeReceiverTest, EstimatedCaptureClockOffsetArithmetic) {
+  static const absl::optional<int64_t> kRemoteCaptureClockOffset =
+      Int64MsToQ32x32(-350);
+  static const absl::optional<int64_t> kRemoteToLocalClockOffset =
+      Int64MsToQ32x32(-7000007);
+  CaptureClockOffsetUpdater updater;
+  updater.SetRemoteToLocalClockOffset(kRemoteToLocalClockOffset);
+  EXPECT_THAT(
+      updater.AdjustEstimatedCaptureClockOffset(kRemoteCaptureClockOffset),
+      ::testing::Optional(::testing::Eq(*kRemoteCaptureClockOffset +
+                                        *kRemoteToLocalClockOffset)));
+}
+
+}  // namespace webrtc