60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SystemTime.h"
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#include "TimeUnits.h"
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namespace mozilla {
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// webrtc::Timestamp may not be negative. `now-base` for the first call to
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// WebrtcSystemTime() is always 0, which makes it impossible for libwebrtc
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// code to calculate a timestamp older than the first one returned. This
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// offset makes sure the clock starts at a value equivalent to roughly 4.5h.
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static constexpr webrtc::TimeDelta kWebrtcTimeOffset =
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webrtc::TimeDelta::Micros(0x10000000);
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RTCStatsTimestampMakerRealtimeClock::RTCStatsTimestampMakerRealtimeClock(
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const dom::RTCStatsTimestampMaker& aTimestampMaker)
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: mTimestampMaker(aTimestampMaker) {}
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webrtc::Timestamp RTCStatsTimestampMakerRealtimeClock::CurrentTime() {
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return mTimestampMaker.GetNow().ToRealtime();
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}
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webrtc::NtpTime RTCStatsTimestampMakerRealtimeClock::ConvertTimestampToNtpTime(
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webrtc::Timestamp aRealtime) {
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return CreateNtp(
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dom::RTCStatsTimestamp::FromRealtime(mTimestampMaker, aRealtime).ToNtp());
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}
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TimeStamp WebrtcSystemTimeBase() {
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static TimeStamp now = TimeStamp::Now();
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return now;
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}
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webrtc::Timestamp WebrtcSystemTime() {
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const TimeStamp base = WebrtcSystemTimeBase();
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const TimeStamp now = TimeStamp::Now();
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return webrtc::Timestamp::Micros((now - base).ToMicroseconds()) +
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kWebrtcTimeOffset;
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}
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webrtc::NtpTime CreateNtp(webrtc::Timestamp aTime) {
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const int64_t timeNtpUs = aTime.us();
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const uint32_t seconds = static_cast<uint32_t>(timeNtpUs / USECS_PER_S);
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constexpr int64_t fractionsPerSec = 1LL << 32;
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const int64_t fractionsUs = timeNtpUs % USECS_PER_S;
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const uint32_t fractions = (fractionsUs * fractionsPerSec) / USECS_PER_S;
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return webrtc::NtpTime(seconds, fractions);
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}
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} // namespace mozilla
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namespace webrtc {
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int64_t SystemTimeNanos() { return mozilla::WebrtcSystemTime().us() * 1000; }
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} // namespace webrtc
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