TestRTCStatsTimestampMaker.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* 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 <cmath>

#include "gtest/gtest.h"

#include "libwebrtcglue/SystemTime.h"

using namespace mozilla;

using dom::PerformanceService;

using dom::RTCStatsTimestamp;

using dom::RTCStatsTimestampMaker;

static constexpr auto kWebrtcTimeOffset = webrtc::Timestamp::Seconds(123456789);

TEST(RTCStatsTimestampMakerRealtimeClock, ConvertTimestampToNtpTime)

  auto maker = RTCStatsTimestampMaker::Create();

  RTCStatsTimestampMakerRealtimeClock clock(maker);

  constexpr auto ntpTo1Jan1970Ms = webrtc::kNtpJan1970 * 1000LL;

  for (int i = 1000; i < 20000; i += 93) {

    const auto t = kWebrtcTimeOffset + webrtc::TimeDelta::Micros(i);

    const auto ntp = clock.ConvertTimestampToNtpTime(t);

    // Because of precision differences, these round to a specific millisecond

    // slightly differently.

    EXPECT_NEAR(ntp.ToMs() - ntpTo1Jan1970Ms,

                RTCStatsTimestamp::FromRealtime(maker, t).To1Jan1970().ms(),

                1.0)

        << " for i=" << i;

TEST(RTCStatsTimestampMaker, ConvertNtpToDomTime)

  auto maker = RTCStatsTimestampMaker::Create();

  RTCStatsTimestampMakerRealtimeClock clock(maker);

  for (int i = 1000; i < 20000; i += 93) {

    const auto t = kWebrtcTimeOffset + webrtc::TimeDelta::Micros(i);

    const auto ntp = clock.ConvertTimestampToNtpTime(t);

    const auto dom =

        RTCStatsTimestamp::FromNtp(maker, webrtc::Timestamp::Millis(ntp.ToMs()))

            .ToDom();

    // Because of precision differences, these round to a specific millisecond

    // slightly differently.

    EXPECT_NEAR(std::lround(dom),

                std::lround(RTCStatsTimestamp::FromRealtime(maker, t).ToDom()),

                1.0)

        << " for i=" << i;

TEST(RTCStatsTimestampMaker, ConvertMozTime)

  auto maker = RTCStatsTimestampMaker::Create();

  const auto start = TimeStamp::Now();

  RTCStatsTimestampMakerRealtimeClock clock(maker);

  for (int i = 1000; i < 20000; i += 93) {

    const auto duration = TimeDuration::FromMicroseconds(i);

    const auto time = RTCStatsTimestamp::FromMozTime(maker, start + duration);

    EXPECT_EQ(duration.ToMicroseconds(),

              (time.ToMozTime() - start).ToMicroseconds())

        << " for i=" << i;

TEST(RTCStatsTimestampMaker, ConvertRealtime)

  auto maker = RTCStatsTimestampMaker::Create();

  const auto start = kWebrtcTimeOffset;

  RTCStatsTimestampMakerRealtimeClock clock(maker);

  for (int i = 1000; i < 20000; i += 93) {

    const auto duration = webrtc::TimeDelta::Micros(i);

    const auto time = RTCStatsTimestamp::FromRealtime(maker, start + duration);

    // Because of precision differences, these round to a specific Microsecond

    // slightly differently.

    EXPECT_NEAR(duration.us(), (time.ToRealtime() - start).us(), 1)

        << " for i=" << i;

TEST(RTCStatsTimestampMaker, Convert1Jan1970)

  auto maker = RTCStatsTimestampMaker::Create();

  const auto start =

      kWebrtcTimeOffset +

      webrtc::TimeDelta::Millis(PerformanceService::GetOrCreate()->TimeOrigin(

          WebrtcSystemTimeBase()));

  RTCStatsTimestampMakerRealtimeClock clock(maker);

  for (int i = 1000; i < 20000; i += 93) {

    const auto duration = webrtc::TimeDelta::Micros(i);

    const auto time = RTCStatsTimestamp::From1Jan1970(maker, start + duration);

    // Because of precision differences, these round to a specific Microsecond

    // slightly differently.

    EXPECT_NEAR(duration.us(), (time.To1Jan1970() - start).us(), 1)

        << " for i=" << i;

TEST(RTCStatsTimestampMaker, ConvertDomRealtime)

  auto maker = RTCStatsTimestampMaker::Create();

  const auto start = kWebrtcTimeOffset;

  RTCStatsTimestampMakerRealtimeClock clock(maker);

  for (int i = 1000; i < 20000; i += 93) {

    const auto duration = webrtc::TimeDelta::Micros(i);

    const auto time =

        RTCStatsTimestamp::FromDomRealtime(maker, start + duration);

    // Because of precision differences, these round to a specific Microsecond

    // slightly differently.

    EXPECT_NEAR(duration.us(), (time.ToDomRealtime() - start).us(), 1)

        << " for i=" << i;