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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 https://mozilla.org/MPL/2.0/. */
#include "RTCStatsReport.h"
#include "libwebrtcglue/SystemTime.h"
#include "mozilla/dom/Performance.h"
#include "nsRFPService.h"
#include "WebrtcGlobal.h"
namespace mozilla::dom {
RTCStatsTimestampMaker::RTCStatsTimestampMaker()
: mRandomTimelineSeed(0),
mStartRealtime(WebrtcSystemTimeBase()),
mRTPCallerType(RTPCallerType::Normal),
mStartWallClockRaw(
PerformanceService::GetOrCreate()->TimeOrigin(mStartRealtime)) {}
RTCStatsTimestampMaker::RTCStatsTimestampMaker(nsPIDOMWindowInner* aWindow)
: mRandomTimelineSeed(
aWindow && aWindow->GetPerformance()
? aWindow->GetPerformance()->GetRandomTimelineSeed()
: 0),
mStartRealtime(aWindow && aWindow->GetPerformance()
? aWindow->GetPerformance()->CreationTimeStamp()
: WebrtcSystemTimeBase()),
mRTPCallerType(aWindow && aWindow->GetPerformance()
? aWindow->GetPerformance()->GetRTPCallerType()
: RTPCallerType::Normal),
mStartWallClockRaw(
PerformanceService::GetOrCreate()->TimeOrigin(mStartRealtime)) {}
DOMHighResTimeStamp RTCStatsTimestampMaker::ReduceRealtimePrecision(
webrtc::Timestamp aRealtime) const {
// webrtc-pc says to use performance.timeOrigin + performance.now(), but
// keeping a Performance object around is difficult because it is
// main-thread-only. So, we perform the same calculation here. Note that this
// can be very different from the current wall-clock time because of changes
// to the wall clock, or monotonic clock drift over long periods of time.
// We are very careful to do exactly what Performance does, to avoid timestamp
// discrepancies.
DOMHighResTimeStamp realtime = aRealtime.ms<double>();
// mRandomTimelineSeed is not set in the unit-tests.
if (mRandomTimelineSeed) {
realtime = nsRFPService::ReduceTimePrecisionAsMSecs(
realtime, mRandomTimelineSeed, mRTPCallerType);
}
// Ugh. Performance::TimeOrigin is not constant, which means we need to
// emulate this weird behavior so our time stamps are consistent with JS
// timeOrigin. This is based on the code here:
// https://searchfox.org/mozilla-central/rev/
// 053826b10f838f77c27507e5efecc96e34718541/dom/performance/Performance.cpp#111-117
DOMHighResTimeStamp start = nsRFPService::ReduceTimePrecisionAsMSecs(
mStartWallClockRaw, 0, mRTPCallerType);
return start + realtime;
}
webrtc::Timestamp RTCStatsTimestampMaker::ConvertRealtimeTo1Jan1970(
webrtc::Timestamp aRealtime) const {
return aRealtime + webrtc::TimeDelta::Millis(mStartWallClockRaw);
}
DOMHighResTimeStamp RTCStatsTimestampMaker::ConvertNtpToDomTime(
webrtc::Timestamp aNtpTime) const {
const auto realtime = aNtpTime -
webrtc::TimeDelta::Seconds(webrtc::kNtpJan1970) -
webrtc::TimeDelta::Millis(mStartWallClockRaw);
// Ntp times exposed by libwebrtc to stats are always **rounded** to
// milliseconds. That means they can jump up to half a millisecond into the
// future. We compensate for that here so that things seem consistent to js.
return ReduceRealtimePrecision(realtime - webrtc::TimeDelta::Micros(500));
}
webrtc::Timestamp RTCStatsTimestampMaker::ConvertMozTimeToRealtime(
TimeStamp aMozTime) const {
return webrtc::Timestamp::Micros(
(aMozTime - mStartRealtime).ToMicroseconds());
}
DOMHighResTimeStamp RTCStatsTimestampMaker::GetNow() const {
return ReduceRealtimePrecision(GetNowRealtime());
}
webrtc::Timestamp RTCStatsTimestampMaker::GetNowRealtime() const {
return ConvertMozTimeToRealtime(TimeStamp::Now());
}
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(RTCStatsReport, mParent)
RTCStatsReport::RTCStatsReport(nsPIDOMWindowInner* aParent)
: mParent(aParent) {}
/*static*/
already_AddRefed<RTCStatsReport> RTCStatsReport::Constructor(
const GlobalObject& aGlobal) {
nsCOMPtr<nsPIDOMWindowInner> window(
do_QueryInterface(aGlobal.GetAsSupports()));
RefPtr<RTCStatsReport> report(new RTCStatsReport(window));
return report.forget();
}
JSObject* RTCStatsReport::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return RTCStatsReport_Binding::Wrap(aCx, this, aGivenProto);
}
void RTCStatsReport::Incorporate(RTCStatsCollection& aStats) {
ForAllPublicRTCStatsCollectionMembers(
aStats, [&](auto... aMember) { (SetRTCStats(aMember), ...); });
}
void RTCStatsReport::Set(const nsAString& aKey, JS::Handle<JSObject*> aValue,
ErrorResult& aRv) {
RTCStatsReport_Binding::MaplikeHelpers::Set(this, aKey, aValue, aRv);
}
namespace {
template <size_t I, typename... Ts>
bool MoveInto(std::tuple<Ts...>& aFrom, std::tuple<Ts*...>& aInto) {
return std::get<I>(aInto)->AppendElements(std::move(std::get<I>(aFrom)),
fallible);
}
template <size_t... Is, typename... Ts>
bool MoveInto(std::tuple<Ts...>&& aFrom, std::tuple<Ts*...>& aInto,
std::index_sequence<Is...>) {
return (... && MoveInto<Is>(aFrom, aInto));
}
template <typename... Ts>
bool MoveInto(std::tuple<Ts...>&& aFrom, std::tuple<Ts*...>& aInto) {
return MoveInto(std::move(aFrom), aInto, std::index_sequence_for<Ts...>());
}
} // namespace
void MergeStats(UniquePtr<RTCStatsCollection> aFromStats,
RTCStatsCollection* aIntoStats) {
auto fromTuple = ForAllRTCStatsCollectionMembers(
*aFromStats,
[&](auto&... aMember) { return std::make_tuple(std::move(aMember)...); });
auto intoTuple = ForAllRTCStatsCollectionMembers(
*aIntoStats,
[&](auto&... aMember) { return std::make_tuple(&aMember...); });
if (!MoveInto(std::move(fromTuple), intoTuple)) {
mozalloc_handle_oom(0);
}
}
void FlattenStats(nsTArray<UniquePtr<RTCStatsCollection>> aFromStats,
RTCStatsCollection* aIntoStats) {
for (auto& stats : aFromStats) {
MergeStats(std::move(stats), aIntoStats);
}
}
} // namespace mozilla::dom
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