Create api/video/timing directory. Add `VideoJitterTimingInterface` and `VideoJitterTimingFactory` for creating instances of it. Bug: b/493549134 Change-Id: Ib62cbe421adc967e68983ded85776f2bb31af305 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/482400 Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Commit-Queue: Åsa Persson <asapersson@webrtc.org> Cr-Commit-Position: refs/heads/main@{#48055}

diff --git a/api/video/timing/BUILD.gn b/api/video/timing/BUILD.gn
new file mode 100644
index 0000000..9cb217d
--- /dev/null
+++ b/api/video/timing/BUILD.gn

@@ -0,0 +1,30 @@
+# Copyright (c) 2026 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.
+
+import("../../../webrtc.gni")
+
+rtc_source_set("video_jitter_timing_interface") {
+  visibility = [ "*" ]
+  sources = [ "video_jitter_timing_interface.h" ]
+  deps = [
+    "../../environment",
+    "../../units:data_size",
+    "../../units:time_delta",
+    "../../units:timestamp",
+  ]
+}
+
+rtc_source_set("video_jitter_timing_factory") {
+  visibility = [ "*" ]
+  sources = [ "video_jitter_timing_factory.h" ]
+
+  deps = [
+    ":video_jitter_timing_interface",
+    "../../environment",
+  ]
+}

diff --git a/api/video/timing/OWNERS b/api/video/timing/OWNERS
new file mode 100644
index 0000000..0fe225b
--- /dev/null
+++ b/api/video/timing/OWNERS

@@ -0,0 +1,2 @@
+brandtr@webrtc.org
+asapersson@webrtc.org

diff --git a/api/video/timing/video_jitter_timing_factory.h b/api/video/timing/video_jitter_timing_factory.h
new file mode 100644
index 0000000..64646df
--- /dev/null
+++ b/api/video/timing/video_jitter_timing_factory.h

@@ -0,0 +1,32 @@
+/*
+ *  Copyright (c) 2026 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.
+ */
+
+#ifndef API_VIDEO_TIMING_VIDEO_JITTER_TIMING_FACTORY_H_
+#define API_VIDEO_TIMING_VIDEO_JITTER_TIMING_FACTORY_H_
+
+#include <memory>
+
+#include "api/environment/environment.h"
+#include "api/video/timing/video_jitter_timing_interface.h"
+
+namespace webrtc {
+
+// Creates VideoJitterTimingInterface instances.
+class VideoJitterTimingFactory {
+ public:
+  virtual ~VideoJitterTimingFactory() = default;
+
+  virtual std::unique_ptr<VideoJitterTimingInterface> Create(
+      const Environment& env) const = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // API_VIDEO_TIMING_VIDEO_JITTER_TIMING_FACTORY_H_

diff --git a/api/video/timing/video_jitter_timing_interface.h b/api/video/timing/video_jitter_timing_interface.h
new file mode 100644
index 0000000..3af95bd
--- /dev/null
+++ b/api/video/timing/video_jitter_timing_interface.h

@@ -0,0 +1,61 @@
+/*
+ *  Copyright (c) 2026 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.
+ */
+
+#ifndef API_VIDEO_TIMING_VIDEO_JITTER_TIMING_INTERFACE_H_
+#define API_VIDEO_TIMING_VIDEO_JITTER_TIMING_INTERFACE_H_
+
+#include <cstdint>
+#include <optional>
+
+#include "api/units/data_size.h"
+#include "api/units/time_delta.h"
+#include "api/units/timestamp.h"
+
+namespace webrtc {
+
+// NOTE: This class is still under development and may change without notice.
+class VideoJitterTimingInterface {
+ public:
+  struct TemporalUnitInfo {
+    uint32_t rtp_timestamp = 0;
+    DataSize size = DataSize::Zero();
+    Timestamp time = Timestamp::PlusInfinity();
+    bool was_retransmitted = false;
+  };
+
+  struct NetworkInfo {
+    TimeDelta rtt = TimeDelta::PlusInfinity();
+  };
+
+  virtual ~VideoJitterTimingInterface() = default;
+
+  // Resets the model to its initial state.
+  virtual void Reset() = 0;
+
+  // Updates the model with the timestamp of a complete frame.
+  virtual void OnCompleteFrame(uint32_t rtp_timestamp,
+                               Timestamp receive_time) = 0;
+
+  // Returns the estimated local clock time for a given RTP timestamp (or
+  // nullopt if not available).
+  virtual std::optional<Timestamp> LocalTime(uint32_t rtp_timestamp) const = 0;
+
+  // Updates the model with information of a decodable temporal unit.
+  // Returns the estimated jitter delay (or nullopt if not available).
+  virtual std::optional<TimeDelta> OnDecodableTemporalUnit(
+      const TemporalUnitInfo& info) = 0;
+
+  // Updates the model with network information.
+  virtual void OnNetworkUpdate(const NetworkInfo& info) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // API_VIDEO_TIMING_VIDEO_JITTER_TIMING_INTERFACE_H_