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/*
* Copyright (c) 2014 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 "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "webrtc/common_types.h"
#include "webrtc/modules/rtp_rtcp/interface/remote_ntp_time_estimator.h"
#include "webrtc/system_wrappers/include/clock.h"
using ::testing::_;
using ::testing::DoAll;
using ::testing::Return;
using ::testing::SetArgPointee;
namespace webrtc {
static const int64_t kTestRtt = 10;
static const int64_t kLocalClockInitialTimeMs = 123;
static const int64_t kRemoteClockInitialTimeMs = 345;
static const uint32_t kTimestampOffset = 567;
class RemoteNtpTimeEstimatorTest : public ::testing::Test {
protected:
RemoteNtpTimeEstimatorTest()
: local_clock_(kLocalClockInitialTimeMs * 1000),
remote_clock_(kRemoteClockInitialTimeMs * 1000),
estimator_(&local_clock_) {}
~RemoteNtpTimeEstimatorTest() {}
void AdvanceTimeMilliseconds(int64_t ms) {
local_clock_.AdvanceTimeMilliseconds(ms);
remote_clock_.AdvanceTimeMilliseconds(ms);
}
uint32_t GetRemoteTimestamp() {
return static_cast<uint32_t>(remote_clock_.TimeInMilliseconds()) * 90 +
kTimestampOffset;
}
void SendRtcpSr() {
uint32_t rtcp_timestamp = GetRemoteTimestamp();
uint32_t ntp_seconds;
uint32_t ntp_fractions;
remote_clock_.CurrentNtp(ntp_seconds, ntp_fractions);
AdvanceTimeMilliseconds(kTestRtt / 2);
ReceiveRtcpSr(kTestRtt, rtcp_timestamp, ntp_seconds, ntp_fractions);
}
void UpdateRtcpTimestamp(int64_t rtt, uint32_t ntp_secs, uint32_t ntp_frac,
uint32_t rtp_timestamp, bool expected_result) {
EXPECT_EQ(expected_result,
estimator_.UpdateRtcpTimestamp(rtt, ntp_secs, ntp_frac,
rtp_timestamp));
}
void ReceiveRtcpSr(int64_t rtt,
uint32_t rtcp_timestamp,
uint32_t ntp_seconds,
uint32_t ntp_fractions) {
UpdateRtcpTimestamp(rtt, ntp_seconds, ntp_fractions, rtcp_timestamp, true);
}
SimulatedClock local_clock_;
SimulatedClock remote_clock_;
RemoteNtpTimeEstimator estimator_;
};
TEST_F(RemoteNtpTimeEstimatorTest, Estimate) {
// Failed without valid NTP.
UpdateRtcpTimestamp(kTestRtt, 0, 0, 0, false);
AdvanceTimeMilliseconds(1000);
// Remote peer sends first RTCP SR.
SendRtcpSr();
// Remote sends a RTP packet.
AdvanceTimeMilliseconds(15);
uint32_t rtp_timestamp = GetRemoteTimestamp();
int64_t capture_ntp_time_ms = local_clock_.CurrentNtpInMilliseconds();
// Local peer needs at least 2 RTCP SR to calculate the capture time.
const int64_t kNotEnoughRtcpSr = -1;
EXPECT_EQ(kNotEnoughRtcpSr, estimator_.Estimate(rtp_timestamp));
AdvanceTimeMilliseconds(800);
// Remote sends second RTCP SR.
SendRtcpSr();
// Local peer gets enough RTCP SR to calculate the capture time.
EXPECT_EQ(capture_ntp_time_ms, estimator_.Estimate(rtp_timestamp));
}
} // namespace webrtc
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