1 /*
2 * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10 #include "modules/rtp_rtcp/source/time_util.h"
11
12 #include "rtc_base/fake_clock.h"
13 #include "rtc_base/time_utils.h"
14 #include "system_wrappers/include/clock.h"
15 #include "test/gtest.h"
16
17 namespace webrtc {
18
TEST(TimeUtilTest,TimeMicrosToNtpDoesntChangeBetweenRuns)19 TEST(TimeUtilTest, TimeMicrosToNtpDoesntChangeBetweenRuns) {
20 rtc::ScopedFakeClock clock;
21 // TimeMicrosToNtp is not pure: it behave differently between different
22 // execution of the program, but should behave same during same execution.
23 const int64_t time_us = 12345;
24 clock.SetTime(Timestamp::Micros(2));
25 NtpTime time_ntp = TimeMicrosToNtp(time_us);
26 clock.SetTime(Timestamp::Micros(time_us));
27 EXPECT_EQ(TimeMicrosToNtp(time_us), time_ntp);
28 clock.SetTime(Timestamp::Micros(1000000));
29 EXPECT_EQ(TimeMicrosToNtp(time_us), time_ntp);
30 }
31
TEST(TimeUtilTest,TimeMicrosToNtpKeepsIntervals)32 TEST(TimeUtilTest, TimeMicrosToNtpKeepsIntervals) {
33 rtc::ScopedFakeClock clock;
34 NtpTime time_ntp1 = TimeMicrosToNtp(rtc::TimeMicros());
35 clock.AdvanceTime(TimeDelta::Millis(20));
36 NtpTime time_ntp2 = TimeMicrosToNtp(rtc::TimeMicros());
37 EXPECT_EQ(time_ntp2.ToMs() - time_ntp1.ToMs(), 20);
38 }
39
TEST(TimeUtilTest,CompactNtp)40 TEST(TimeUtilTest, CompactNtp) {
41 const uint32_t kNtpSec = 0x12345678;
42 const uint32_t kNtpFrac = 0x23456789;
43 const NtpTime kNtp(kNtpSec, kNtpFrac);
44 const uint32_t kNtpMid = 0x56782345;
45 EXPECT_EQ(kNtpMid, CompactNtp(kNtp));
46 }
47
TEST(TimeUtilTest,CompactNtpRttToMs)48 TEST(TimeUtilTest, CompactNtpRttToMs) {
49 const NtpTime ntp1(0x12345, 0x23456);
50 const NtpTime ntp2(0x12654, 0x64335);
51 int64_t ms_diff = ntp2.ToMs() - ntp1.ToMs();
52 uint32_t ntp_diff = CompactNtp(ntp2) - CompactNtp(ntp1);
53
54 int64_t ntp_to_ms_diff = CompactNtpRttToMs(ntp_diff);
55
56 EXPECT_NEAR(ms_diff, ntp_to_ms_diff, 1);
57 }
58
TEST(TimeUtilTest,CompactNtpRttToMsWithWrap)59 TEST(TimeUtilTest, CompactNtpRttToMsWithWrap) {
60 const NtpTime ntp1(0x1ffff, 0x23456);
61 const NtpTime ntp2(0x20000, 0x64335);
62 int64_t ms_diff = ntp2.ToMs() - ntp1.ToMs();
63
64 // While ntp2 > ntp1, there compact ntp presentation happen to be opposite.
65 // That shouldn't be a problem as long as unsigned arithmetic is used.
66 ASSERT_GT(ntp2.ToMs(), ntp1.ToMs());
67 ASSERT_LT(CompactNtp(ntp2), CompactNtp(ntp1));
68
69 uint32_t ntp_diff = CompactNtp(ntp2) - CompactNtp(ntp1);
70 int64_t ntp_to_ms_diff = CompactNtpRttToMs(ntp_diff);
71
72 EXPECT_NEAR(ms_diff, ntp_to_ms_diff, 1);
73 }
74
TEST(TimeUtilTest,CompactNtpRttToMsLarge)75 TEST(TimeUtilTest, CompactNtpRttToMsLarge) {
76 const NtpTime ntp1(0x10000, 0x00006);
77 const NtpTime ntp2(0x17fff, 0xffff5);
78 int64_t ms_diff = ntp2.ToMs() - ntp1.ToMs();
79 // Ntp difference close to 2^15 seconds should convert correctly too.
80 ASSERT_NEAR(ms_diff, ((1 << 15) - 1) * 1000, 1);
81 uint32_t ntp_diff = CompactNtp(ntp2) - CompactNtp(ntp1);
82 int64_t ntp_to_ms_diff = CompactNtpRttToMs(ntp_diff);
83
84 EXPECT_NEAR(ms_diff, ntp_to_ms_diff, 1);
85 }
86
TEST(TimeUtilTest,CompactNtpRttToMsNegative)87 TEST(TimeUtilTest, CompactNtpRttToMsNegative) {
88 const NtpTime ntp1(0x20000, 0x23456);
89 const NtpTime ntp2(0x1ffff, 0x64335);
90 int64_t ms_diff = ntp2.ToMs() - ntp1.ToMs();
91 ASSERT_GT(0, ms_diff);
92 // Ntp difference close to 2^16 seconds should be treated as negative.
93 uint32_t ntp_diff = CompactNtp(ntp2) - CompactNtp(ntp1);
94 int64_t ntp_to_ms_diff = CompactNtpRttToMs(ntp_diff);
95 EXPECT_EQ(1, ntp_to_ms_diff);
96 }
97
TEST(TimeUtilTest,SaturatedUsToCompactNtp)98 TEST(TimeUtilTest, SaturatedUsToCompactNtp) {
99 // Converts negative to zero.
100 EXPECT_EQ(SaturatedUsToCompactNtp(-1), 0u);
101 EXPECT_EQ(SaturatedUsToCompactNtp(0), 0u);
102 // Converts values just above and just below max uint32_t.
103 EXPECT_EQ(SaturatedUsToCompactNtp(65536000000), 0xffffffff);
104 EXPECT_EQ(SaturatedUsToCompactNtp(65535999985), 0xffffffff);
105 EXPECT_EQ(SaturatedUsToCompactNtp(65535999970), 0xfffffffe);
106 // Converts half-seconds.
107 EXPECT_EQ(SaturatedUsToCompactNtp(500000), 0x8000u);
108 EXPECT_EQ(SaturatedUsToCompactNtp(1000000), 0x10000u);
109 EXPECT_EQ(SaturatedUsToCompactNtp(1500000), 0x18000u);
110 // Convert us -> compact_ntp -> ms. Compact ntp precision is ~15us.
111 EXPECT_EQ(CompactNtpRttToMs(SaturatedUsToCompactNtp(1516)), 2);
112 EXPECT_EQ(CompactNtpRttToMs(SaturatedUsToCompactNtp(15000)), 15);
113 EXPECT_EQ(CompactNtpRttToMs(SaturatedUsToCompactNtp(5485)), 5);
114 EXPECT_EQ(CompactNtpRttToMs(SaturatedUsToCompactNtp(5515)), 6);
115 }
116
117 } // namespace webrtc
118