bda11ca6da
TimestampExtrapolator maps RTP timestamps of received video frames to local timestamps. As part of this mapping, the clock drift between the local and remote clock is estimated. Add the histogram WebRTC.Video.EstimatedClockDrift_ppm to log the relative clock drift in points per million. Bug: b/363166487 Change-Id: I0c2e628ef72c05a93e1f3138c8f71c77467130b7 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/368342 Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Commit-Queue: Johannes Kron <kron@webrtc.org> Cr-Commit-Position: refs/heads/main@{#43413}
51 lines
1.5 KiB
C++
51 lines
1.5 KiB
C++
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_VIDEO_CODING_TIMING_TIMESTAMP_EXTRAPOLATOR_H_
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#define MODULES_VIDEO_CODING_TIMING_TIMESTAMP_EXTRAPOLATOR_H_
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#include <stdint.h>
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#include <optional>
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#include "api/units/timestamp.h"
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#include "rtc_base/numerics/sequence_number_unwrapper.h"
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namespace webrtc {
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// Not thread safe.
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class TimestampExtrapolator {
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public:
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explicit TimestampExtrapolator(Timestamp start);
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~TimestampExtrapolator();
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void Update(Timestamp now, uint32_t ts90khz);
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std::optional<Timestamp> ExtrapolateLocalTime(uint32_t timestamp90khz) const;
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void Reset(Timestamp start);
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private:
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void CheckForWrapArounds(uint32_t ts90khz);
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bool DelayChangeDetection(double error);
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double w_[2];
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double p_[2][2];
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Timestamp start_;
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Timestamp prev_;
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std::optional<int64_t> first_unwrapped_timestamp_;
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RtpTimestampUnwrapper unwrapper_;
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std::optional<int64_t> prev_unwrapped_timestamp_;
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int packet_count_;
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double detector_accumulator_pos_;
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double detector_accumulator_neg_;
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};
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} // namespace webrtc
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#endif // MODULES_VIDEO_CODING_TIMING_TIMESTAMP_EXTRAPOLATOR_H_
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