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