b9b146c9fe
This is a no-op change because rtc::Optional is an alias to absl::optional
This CL generated by running script with parameters 'audio call video':
#!/bin/bash
find $@ -type f \( -name \*.h -o -name \*.cc \) \
-exec sed -i 's|rtc::Optional|absl::optional|g' {} \+ \
-exec sed -i 's|rtc::nullopt|absl::nullopt|g' {} \+ \
-exec sed -i 's|#include "api/optional.h"|#include "absl/types/optional.h"|' {} \+
find $@ -type f -name BUILD.gn \
-exec sed -r -i 's|"(../)*api:optional"|"//third_party/abseil-cpp/absl/types:optional"|' {} \+;
git cl format
Bug: webrtc:9078
Change-Id: I02c5db956846a88a268a300ba086703a02d62e36
Reviewed-on: https://webrtc-review.googlesource.com/83722
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23628}
48 lines
2.0 KiB
C++
48 lines
2.0 KiB
C++
/*
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* Copyright (c) 2018 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 CALL_RECEIVE_TIME_CALCULATOR_H_
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#define CALL_RECEIVE_TIME_CALCULATOR_H_
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#include <stdint.h>
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#include <memory>
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#include "absl/types/optional.h"
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namespace webrtc {
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// The receive time calculator serves the purpose of combining packet time
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// stamps with a safely incremental clock. This assumes that the packet time
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// stamps are based on lower layer timestamps that have more accurate time
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// increments since they are based on the exact receive time. They might
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// however, have large jumps due to clock resets in the system. To compensate
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// this they are combined with a safe clock source that is guaranteed to be
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// consistent, but it will not be able to measure the exact time when a packet
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// is received.
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class ReceiveTimeCalculator {
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public:
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static std::unique_ptr<ReceiveTimeCalculator> CreateFromFieldTrial();
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// The min delta is used to correct for jumps backwards in time, to allow some
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// packet reordering a small negative value is appropriate to use. The max
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// delta difference is used as margin when detecting when packet time
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// increases more than the safe clock. This should be larger than the largest
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// expected sysmtem induced delay in the safe clock timestamp.
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ReceiveTimeCalculator(int64_t min_delta_ms, int64_t max_delta_diff_ms);
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int64_t ReconcileReceiveTimes(int64_t packet_time_us_, int64_t safe_time_us_);
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private:
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const int64_t min_delta_us_;
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const int64_t max_delta_diff_us_;
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absl::optional<int64_t> receive_time_offset_us_;
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int64_t last_packet_time_us_ = 0;
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int64_t last_safe_time_us_ = 0;
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};
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} // namespace webrtc
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#endif // CALL_RECEIVE_TIME_CALCULATOR_H_
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