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/*
* Copyright (c) 2016 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 WEBRTC_BASE_TIMESTAMPALIGNER_H_
#define WEBRTC_BASE_TIMESTAMPALIGNER_H_
#include "webrtc/base/basictypes.h"
#include "webrtc/base/constructormagic.h"
#include "webrtc/base/optional.h"
namespace rtc {
// This class is not thread safe, so all calls to it must be synchronized
// externally.
class TimestampAligner {
public:
TimestampAligner();
~TimestampAligner();
public:
// Update the estimated offset between camera time and system monotonic time.
int64_t UpdateOffset(int64_t camera_time_us, int64_t system_time_us);
int64_t ClipTimestamp(int64_t filtered_time_us, int64_t system_time_us);
private:
// State for the timestamp translation.
int frames_seen_;
// Estimated offset between camera time and system monotonic time.
int64_t offset_us_;
// State for timestamp clipping, applied after the filter, to ensure
// that translated timestamps are monotonic and not in the future.
// Subtracted from the translated timestamps.
int64_t clip_bias_us_;
rtc::Optional<int64_t> prev_translated_time_us_;
RTC_DISALLOW_COPY_AND_ASSIGN(TimestampAligner);
};
} // namespace rtc
#endif // WEBRTC_BASE_TIMESTAMPALIGNER_H_