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61fff586b1
Split out time_util.h and cc from target rtp_rtcp to its own target. This is to avoid possible circular dependencies and not having all targets using them to depend on the full RtpRcp module. Bug: webrtc:343076000 Change-Id: I7b3c84456b17f1920f71afdd5a644d27e28caed2 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/352480 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Auto-Submit: Per Kjellander <perkj@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Jakob Ivarsson <jakobi@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42392}
127 lines
5 KiB
C++
127 lines
5 KiB
C++
/*
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* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <cstdint>
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#include <limits>
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#include "api/units/time_delta.h"
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#include "modules/rtp_rtcp/source/ntp_time_util.h"
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#include "test/gtest.h"
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namespace webrtc {
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TEST(NtpTimeUtilTest, CompactNtp) {
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const uint32_t kNtpSec = 0x12345678;
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const uint32_t kNtpFrac = 0x23456789;
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const NtpTime kNtp(kNtpSec, kNtpFrac);
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const uint32_t kNtpMid = 0x56782345;
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EXPECT_EQ(kNtpMid, CompactNtp(kNtp));
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}
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TEST(NtpTimeUtilTest, CompactNtpRttToTimeDelta) {
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const NtpTime ntp1(0x12345, 0x23456);
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const NtpTime ntp2(0x12654, 0x64335);
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int64_t ms_diff = ntp2.ToMs() - ntp1.ToMs();
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uint32_t ntp_diff = CompactNtp(ntp2) - CompactNtp(ntp1);
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EXPECT_NEAR(CompactNtpRttToTimeDelta(ntp_diff).ms(), ms_diff, 1);
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}
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TEST(NtpTimeUtilTest, CompactNtpRttToTimeDeltaWithWrap) {
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const NtpTime ntp1(0x1ffff, 0x23456);
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const NtpTime ntp2(0x20000, 0x64335);
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int64_t ms_diff = ntp2.ToMs() - ntp1.ToMs();
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// While ntp2 > ntp1, there compact ntp presentation happen to be opposite.
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// That shouldn't be a problem as long as unsigned arithmetic is used.
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ASSERT_GT(ntp2.ToMs(), ntp1.ToMs());
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ASSERT_LT(CompactNtp(ntp2), CompactNtp(ntp1));
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uint32_t ntp_diff = CompactNtp(ntp2) - CompactNtp(ntp1);
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EXPECT_NEAR(CompactNtpRttToTimeDelta(ntp_diff).ms(), ms_diff, 1);
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}
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TEST(NtpTimeUtilTest, CompactNtpRttToTimeDeltaLarge) {
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const NtpTime ntp1(0x10000, 0x00006);
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const NtpTime ntp2(0x17fff, 0xffff5);
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int64_t ms_diff = ntp2.ToMs() - ntp1.ToMs();
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// Ntp difference close to 2^15 seconds should convert correctly too.
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ASSERT_NEAR(ms_diff, ((1 << 15) - 1) * 1000, 1);
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uint32_t ntp_diff = CompactNtp(ntp2) - CompactNtp(ntp1);
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EXPECT_NEAR(CompactNtpRttToTimeDelta(ntp_diff).ms(), ms_diff, 1);
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}
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TEST(NtpTimeUtilTest, CompactNtpRttToTimeDeltaNegative) {
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const NtpTime ntp1(0x20000, 0x23456);
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const NtpTime ntp2(0x1ffff, 0x64335);
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int64_t ms_diff = ntp2.ToMs() - ntp1.ToMs();
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ASSERT_GT(0, ms_diff);
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// Ntp difference close to 2^16 seconds should be treated as negative.
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uint32_t ntp_diff = CompactNtp(ntp2) - CompactNtp(ntp1);
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EXPECT_EQ(CompactNtpRttToTimeDelta(ntp_diff), TimeDelta::Millis(1));
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}
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TEST(NtpTimeUtilTest, SaturatedToCompactNtp) {
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// Converts negative to zero.
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EXPECT_EQ(SaturatedToCompactNtp(TimeDelta::Micros(-1)), 0u);
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EXPECT_EQ(SaturatedToCompactNtp(TimeDelta::Zero()), 0u);
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// Converts values just above and just below max uint32_t.
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EXPECT_EQ(SaturatedToCompactNtp(TimeDelta::Micros(65536000000)), 0xffffffff);
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EXPECT_EQ(SaturatedToCompactNtp(TimeDelta::Micros(65535999985)), 0xffffffff);
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EXPECT_EQ(SaturatedToCompactNtp(TimeDelta::Micros(65535999970)), 0xfffffffe);
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// Converts half-seconds.
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EXPECT_EQ(SaturatedToCompactNtp(TimeDelta::Millis(500)), 0x8000u);
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EXPECT_EQ(SaturatedToCompactNtp(TimeDelta::Seconds(1)), 0x10000u);
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EXPECT_EQ(SaturatedToCompactNtp(TimeDelta::Millis(1'500)), 0x18000u);
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// Convert us -> compact_ntp -> TimeDelta. Compact ntp precision is ~15us.
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EXPECT_NEAR(
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CompactNtpRttToTimeDelta(SaturatedToCompactNtp(TimeDelta::Micros(1'516)))
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.us(),
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1'516, 16);
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EXPECT_NEAR(
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CompactNtpRttToTimeDelta(SaturatedToCompactNtp(TimeDelta::Millis(15)))
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.us(),
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15'000, 16);
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EXPECT_NEAR(
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CompactNtpRttToTimeDelta(SaturatedToCompactNtp(TimeDelta::Micros(5'485)))
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.us(),
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5'485, 16);
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EXPECT_NEAR(
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CompactNtpRttToTimeDelta(SaturatedToCompactNtp(TimeDelta::Micros(5'515)))
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.us(),
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5'515, 16);
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}
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TEST(NtpTimeUtilTest, ToNtpUnits) {
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EXPECT_EQ(ToNtpUnits(TimeDelta::Zero()), 0);
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EXPECT_EQ(ToNtpUnits(TimeDelta::Seconds(1)), int64_t{1} << 32);
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EXPECT_EQ(ToNtpUnits(TimeDelta::Seconds(-1)), -(int64_t{1} << 32));
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EXPECT_EQ(ToNtpUnits(TimeDelta::Millis(500)), int64_t{1} << 31);
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EXPECT_EQ(ToNtpUnits(TimeDelta::Millis(-1'500)), -(int64_t{3} << 31));
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// Smallest TimeDelta that can be converted without precision loss.
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EXPECT_EQ(ToNtpUnits(TimeDelta::Micros(15'625)), int64_t{1} << 26);
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// 1 us ~= 4'294.97 NTP units. ToNtpUnits makes no rounding promises.
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EXPECT_GE(ToNtpUnits(TimeDelta::Micros(1)), 4'294);
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EXPECT_LE(ToNtpUnits(TimeDelta::Micros(1)), 4'295);
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// Test near maximum and minimum supported values.
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static constexpr int64_t k35MinutesInNtpUnits = int64_t{35 * 60} << 32;
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EXPECT_EQ(ToNtpUnits(TimeDelta::Seconds(35 * 60)), k35MinutesInNtpUnits);
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EXPECT_EQ(ToNtpUnits(TimeDelta::Seconds(-35 * 60)), -k35MinutesInNtpUnits);
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// The result for too large or too small values is unspecified, but
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// shouldn't cause integer overflow or other undefined behavior.
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ToNtpUnits(TimeDelta::Micros(std::numeric_limits<int64_t>::max() - 1));
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ToNtpUnits(TimeDelta::Micros(std::numeric_limits<int64_t>::min() + 1));
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}
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} // namespace webrtc
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