1 files changed, 33 insertions, 0 deletions
diff --git a/modules/rtp_rtcp/source/capture_clock_offset_updater.cc b/modules/rtp_rtcp/source/capture_clock_offset_updater.cc
new file mode 100644
index 0000000000..a5b12cb422
--- /dev/null
+++ b/modules/rtp_rtcp/source/capture_clock_offset_updater.cc
@@ -0,0 +1,33 @@
+/*
+ *  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"
+
+namespace webrtc {
+
+absl::optional<int64_t>
+CaptureClockOffsetUpdater::AdjustEstimatedCaptureClockOffset(
+    absl::optional<int64_t> remote_capture_clock_offset) const {
+  if (remote_capture_clock_offset == absl::nullopt ||
+      remote_to_local_clock_offset_ == absl::nullopt) {
+    return absl::nullopt;
+  }
+
+  // Do calculations as "unsigned" to make overflows deterministic.
+  return static_cast<uint64_t>(*remote_capture_clock_offset) +
+         static_cast<uint64_t>(*remote_to_local_clock_offset_);
+}
+
+void CaptureClockOffsetUpdater::SetRemoteToLocalClockOffset(
+    absl::optional<int64_t> offset_q32x32) {
+  remote_to_local_clock_offset_ = offset_q32x32;
+}
+
+}  // namespace webrtc