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/*
* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/rtp_rtcp/source/time_util.h"
#include "test/gtest.h"
namespace webrtc {
TEST(TimeUtilTest, CompactNtp) {
const uint32_t kNtpSec = 0x12345678;
const uint32_t kNtpFrac = 0x23456789;
const NtpTime kNtp(kNtpSec, kNtpFrac);
const uint32_t kNtpMid = 0x56782345;
EXPECT_EQ(kNtpMid, CompactNtp(kNtp));
}
TEST(TimeUtilTest, CompactNtpRttToMs) {
const NtpTime ntp1(0x12345, 0x23456);
const NtpTime ntp2(0x12654, 0x64335);
int64_t ms_diff = ntp2.ToMs() - ntp1.ToMs();
uint32_t ntp_diff = CompactNtp(ntp2) - CompactNtp(ntp1);
int64_t ntp_to_ms_diff = CompactNtpRttToMs(ntp_diff);
EXPECT_NEAR(ms_diff, ntp_to_ms_diff, 1);
}
TEST(TimeUtilTest, CompactNtpRttToMsWithWrap) {
const NtpTime ntp1(0x1ffff, 0x23456);
const NtpTime ntp2(0x20000, 0x64335);
int64_t ms_diff = ntp2.ToMs() - ntp1.ToMs();
// While ntp2 > ntp1, there compact ntp presentation happen to be opposite.
// That shouldn't be a problem as long as unsigned arithmetic is used.
ASSERT_GT(ntp2.ToMs(), ntp1.ToMs());
ASSERT_LT(CompactNtp(ntp2), CompactNtp(ntp1));
uint32_t ntp_diff = CompactNtp(ntp2) - CompactNtp(ntp1);
int64_t ntp_to_ms_diff = CompactNtpRttToMs(ntp_diff);
EXPECT_NEAR(ms_diff, ntp_to_ms_diff, 1);
}
TEST(TimeUtilTest, CompactNtpRttToMsLarge) {
const NtpTime ntp1(0x10000, 0x00006);
const NtpTime ntp2(0x17fff, 0xffff5);
int64_t ms_diff = ntp2.ToMs() - ntp1.ToMs();
// Ntp difference close to 2^15 seconds should convert correctly too.
ASSERT_NEAR(ms_diff, ((1 << 15) - 1) * 1000, 1);
uint32_t ntp_diff = CompactNtp(ntp2) - CompactNtp(ntp1);
int64_t ntp_to_ms_diff = CompactNtpRttToMs(ntp_diff);
EXPECT_NEAR(ms_diff, ntp_to_ms_diff, 1);
}
TEST(TimeUtilTest, CompactNtpRttToMsNegative) {
const NtpTime ntp1(0x20000, 0x23456);
const NtpTime ntp2(0x1ffff, 0x64335);
int64_t ms_diff = ntp2.ToMs() - ntp1.ToMs();
ASSERT_GT(0, ms_diff);
// Ntp difference close to 2^16 seconds should be treated as negative.
uint32_t ntp_diff = CompactNtp(ntp2) - CompactNtp(ntp1);
int64_t ntp_to_ms_diff = CompactNtpRttToMs(ntp_diff);
EXPECT_EQ(1, ntp_to_ms_diff);
}
TEST(TimeUtilTest, SaturatedUsToCompactNtp) {
// Converts negative to zero.
EXPECT_EQ(SaturatedUsToCompactNtp(-1), 0u);
EXPECT_EQ(SaturatedUsToCompactNtp(0), 0u);
// Converts values just above and just below max uint32_t.
EXPECT_EQ(SaturatedUsToCompactNtp(65536000000), 0xffffffff);
EXPECT_EQ(SaturatedUsToCompactNtp(65535999985), 0xffffffff);
EXPECT_EQ(SaturatedUsToCompactNtp(65535999970), 0xfffffffe);
// Converts half-seconds.
EXPECT_EQ(SaturatedUsToCompactNtp(500000), 0x8000u);
EXPECT_EQ(SaturatedUsToCompactNtp(1000000), 0x10000u);
EXPECT_EQ(SaturatedUsToCompactNtp(1500000), 0x18000u);
// Convert us -> compact_ntp -> ms. Compact ntp precision is ~15us.
EXPECT_EQ(CompactNtpRttToMs(SaturatedUsToCompactNtp(1516)), 2);
EXPECT_EQ(CompactNtpRttToMs(SaturatedUsToCompactNtp(15000)), 15);
EXPECT_EQ(CompactNtpRttToMs(SaturatedUsToCompactNtp(5485)), 5);
EXPECT_EQ(CompactNtpRttToMs(SaturatedUsToCompactNtp(5515)), 6);
}
} // namespace webrtc
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