1 files changed, 113 insertions, 0 deletions
diff --git a/dom/media/gtest/TestRTCStatsTimestampMaker.cpp b/dom/media/gtest/TestRTCStatsTimestampMaker.cpp
new file mode 100644
index 0000000000..7997c22d1f
--- /dev/null
+++ b/dom/media/gtest/TestRTCStatsTimestampMaker.cpp
@@ -0,0 +1,113 @@
+/* -*- 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 namespace dom;
+
+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;
+  }
+}