dom/media/gtest/TestRTCStatsTimestampMaker.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   4  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include <cmath>
   7
   8 #include "gtest/gtest.h"
   9 #include "libwebrtcglue/SystemTime.h"
  10
  11 using namespace mozilla;
  12 using namespace dom;
  13
  14 TEST(RTCStatsTimestampMakerRealtimeClock, ConvertTimestampToNtpTime)
  15 {
  16   RTCStatsTimestampMaker maker;
  17   RTCStatsTimestampMakerRealtimeClock clock(maker);
  18   constexpr auto ntpTo1Jan1970Ms = webrtc::kNtpJan1970 * 1000LL;
  19   for (int i = 1000; i < 20000; i += 93) {
  20     const auto t = webrtc::Timestamp::Micros(i);
  21     const auto ntp = clock.ConvertTimestampToNtpTime(t);
  22     // Because of precision differences, these round to a specific millisecond
  23     // slightly differently.
  24     EXPECT_NEAR(ntp.ToMs() - ntpTo1Jan1970Ms,
  25                 maker.ConvertRealtimeTo1Jan1970(t).ms(), 1.0)
  26         << " for i=" << i;
  27   }
  28 }
  29
  30 TEST(RTCStatsTimestampMaker, ConvertNtpToDomTime)
  31 {
  32   RTCStatsTimestampMaker maker;
  33   RTCStatsTimestampMakerRealtimeClock clock(maker);
  34   for (int i = 1000; i < 20000; i += 93) {
  35     const auto t = webrtc::Timestamp::Micros(i);
  36     const auto ntp = clock.ConvertTimestampToNtpTime(t);
  37     const auto dom =
  38         maker.ConvertNtpToDomTime(webrtc::Timestamp::Millis(ntp.ToMs()));
  39     // Because of precision differences, these round to a specific millisecond
  40     // slightly differently.
  41     EXPECT_NEAR(std::lround(dom), std::lround(maker.ReduceRealtimePrecision(t)),
  42                 1.0)
  43         << " for i=" << i;
  44   }
  45 }