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+/*
+ * Copyright (c) 2017 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.
+ */
+
+// Syncable is used by RtpStreamsSynchronizer in VideoReceiveStreamInterface,
+// and implemented by AudioReceiveStreamInterface.
+
+#ifndef CALL_SYNCABLE_H_
+#define CALL_SYNCABLE_H_
+
+#include <stdint.h>
+
+#include "absl/types/optional.h"
+
+namespace webrtc {
+
+class Syncable {
+ public:
+ struct Info {
+ int64_t latest_receive_time_ms = 0;
+ uint32_t latest_received_capture_timestamp = 0;
+ uint32_t capture_time_ntp_secs = 0;
+ uint32_t capture_time_ntp_frac = 0;
+ uint32_t capture_time_source_clock = 0;
+ int current_delay_ms = 0;
+ };
+
+ virtual ~Syncable();
+
+ virtual uint32_t id() const = 0;
+ virtual absl::optional<Info> GetInfo() const = 0;
+ virtual bool GetPlayoutRtpTimestamp(uint32_t* rtp_timestamp,
+ int64_t* time_ms) const = 0;
+ virtual bool SetMinimumPlayoutDelay(int delay_ms) = 0;
+ virtual void SetEstimatedPlayoutNtpTimestampMs(int64_t ntp_timestamp_ms,
+ int64_t time_ms) = 0;
+};
+} // namespace webrtc
+
+#endif // CALL_SYNCABLE_H_