60 lines
2.0 KiB
C++
60 lines
2.0 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 WEBRTC_MODULES_VIDEO_CODING_TIMESTAMP_EXTRAPOLATOR_H_
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#define WEBRTC_MODULES_VIDEO_CODING_TIMESTAMP_EXTRAPOLATOR_H_
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#include "typedefs.h"
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#include "rw_lock_wrapper.h"
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namespace webrtc
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{
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class VCMTimestampExtrapolator
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{
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public:
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VCMTimestampExtrapolator(WebRtc_Word32 vcmId = 0, WebRtc_Word32 receiverId = 0);
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~VCMTimestampExtrapolator();
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void Update(WebRtc_Word64 tMs, WebRtc_UWord32 ts90khz, bool trace = true);
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WebRtc_UWord32 ExtrapolateTimestamp(WebRtc_Word64 tMs) const;
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WebRtc_Word64 ExtrapolateLocalTime(WebRtc_UWord32 timestamp90khz) const;
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void Reset(WebRtc_Word64 nowMs = -1);
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private:
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void CheckForWrapArounds(WebRtc_UWord32 ts90khz);
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bool DelayChangeDetection(double error, bool trace = true);
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RWLockWrapper& _rwLock;
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WebRtc_Word32 _vcmId;
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WebRtc_Word32 _id;
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bool _trace;
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double _w[2];
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double _P[2][2];
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WebRtc_Word64 _startMs;
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WebRtc_Word64 _prevMs;
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WebRtc_UWord32 _firstTimestamp;
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WebRtc_Word32 _wrapArounds;
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WebRtc_UWord32 _prevTs90khz;
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const double _lambda;
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bool _firstAfterReset;
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WebRtc_UWord32 _packetCount;
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const WebRtc_UWord32 _startUpFilterDelayInPackets;
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double _detectorAccumulatorPos;
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double _detectorAccumulatorNeg;
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const double _alarmThreshold;
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const double _accDrift;
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const double _accMaxError;
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const double _P11;
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_VIDEO_CODING_TIMESTAMP_EXTRAPOLATOR_H_
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