Make class of static functions in rtp_to_ntp.h:

webrtc/system_wrappers/source/rtp_to_ntp_estimator_unittest.cc

+/*
+ *  Copyright (c) 2012 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 "webrtc/system_wrappers/include/rtp_to_ntp_estimator.h"
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+namespace {
+const uint32_t kOneMsInNtpFrac = 4294967;
+const uint32_t kTimestampTicksPerMs = 90;
+}  // namespace
+
+TEST(WrapAroundTests, NoWrap) {
+  EXPECT_EQ(0, CheckForWrapArounds(0xFFFFFFFF, 0xFFFFFFFE));
+  EXPECT_EQ(0, CheckForWrapArounds(1, 0));
+  EXPECT_EQ(0, CheckForWrapArounds(0x00010000, 0x0000FFFF));
+}
+
+TEST(WrapAroundTests, ForwardWrap) {
+  EXPECT_EQ(1, CheckForWrapArounds(0, 0xFFFFFFFF));
+  EXPECT_EQ(1, CheckForWrapArounds(0, 0xFFFF0000));
+  EXPECT_EQ(1, CheckForWrapArounds(0x0000FFFF, 0xFFFFFFFF));
+  EXPECT_EQ(1, CheckForWrapArounds(0x0000FFFF, 0xFFFF0000));
+}
+
+TEST(WrapAroundTests, BackwardWrap) {
+  EXPECT_EQ(-1, CheckForWrapArounds(0xFFFFFFFF, 0));
+  EXPECT_EQ(-1, CheckForWrapArounds(0xFFFF0000, 0));
+  EXPECT_EQ(-1, CheckForWrapArounds(0xFFFFFFFF, 0x0000FFFF));
+  EXPECT_EQ(-1, CheckForWrapArounds(0xFFFF0000, 0x0000FFFF));
+}
+
+TEST(WrapAroundTests, OldRtcpWrapped_OldRtpTimestamp) {
+  RtpToNtpEstimator estimator;
+  bool new_sr;
+  uint32_t ntp_sec = 0;
+  uint32_t ntp_frac = 1;
+  uint32_t timestamp = 0;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  ntp_frac += kOneMsInNtpFrac;
+  timestamp -= kTimestampTicksPerMs;
+  // Expected to fail since the older RTCP has a smaller RTP timestamp than the
+  // newer (old:0, new:4294967206).
+  EXPECT_FALSE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+}
+
+TEST(WrapAroundTests, NewRtcpWrapped) {
+  RtpToNtpEstimator estimator;
+  bool new_sr;
+  uint32_t ntp_sec = 0;
+  uint32_t ntp_frac = 1;
+  uint32_t timestamp = 0xFFFFFFFF;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  ntp_frac += kOneMsInNtpFrac;
+  timestamp += kTimestampTicksPerMs;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  int64_t timestamp_ms = -1;
+  EXPECT_TRUE(estimator.Estimate(estimator.measurements().back().rtp_timestamp,
+                                 &timestamp_ms));
+  // Since this RTP packet has the same timestamp as the RTCP packet constructed
+  // at time 0 it should be mapped to 0 as well.
+  EXPECT_EQ(0, timestamp_ms);
+}
+
+TEST(WrapAroundTests, RtpWrapped) {
+  RtpToNtpEstimator estimator;
+  bool new_sr;
+  uint32_t ntp_sec = 0;
+  uint32_t ntp_frac = 1;
+  uint32_t timestamp = 0xFFFFFFFF - 2 * kTimestampTicksPerMs;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  ntp_frac += kOneMsInNtpFrac;
+  timestamp += kTimestampTicksPerMs;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+
+  int64_t timestamp_ms = -1;
+  EXPECT_TRUE(estimator.Estimate(estimator.measurements().back().rtp_timestamp,
+                                 &timestamp_ms));
+  // Since this RTP packet has the same timestamp as the RTCP packet constructed
+  // at time 0 it should be mapped to 0 as well.
+  EXPECT_EQ(0, timestamp_ms);
+  // Two kTimestampTicksPerMs advanced.
+  timestamp += kTimestampTicksPerMs;
+  EXPECT_TRUE(estimator.Estimate(timestamp, &timestamp_ms));
+  EXPECT_EQ(2, timestamp_ms);
+  // Wrapped rtp.
+  timestamp += kTimestampTicksPerMs;
+  EXPECT_TRUE(estimator.Estimate(timestamp, &timestamp_ms));
+  EXPECT_EQ(3, timestamp_ms);
+}
+
+TEST(WrapAroundTests, OldRtp_RtcpsWrapped) {
+  RtpToNtpEstimator estimator;
+  bool new_sr;
+  uint32_t ntp_sec = 0;
+  uint32_t ntp_frac = 1;
+  uint32_t timestamp = 0;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  ntp_frac += kOneMsInNtpFrac;
+  timestamp += kTimestampTicksPerMs;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  timestamp -= 2 * kTimestampTicksPerMs;
+  int64_t timestamp_ms = -1;
+  EXPECT_FALSE(estimator.Estimate(timestamp, &timestamp_ms));
+}
+
+TEST(WrapAroundTests, OldRtp_NewRtcpWrapped) {
+  RtpToNtpEstimator estimator;
+  bool new_sr;
+  uint32_t ntp_sec = 0;
+  uint32_t ntp_frac = 1;
+  uint32_t timestamp = 0xFFFFFFFF;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  ntp_frac += kOneMsInNtpFrac;
+  timestamp += kTimestampTicksPerMs;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  timestamp -= kTimestampTicksPerMs;
+  int64_t timestamp_ms = -1;
+  EXPECT_TRUE(estimator.Estimate(timestamp, &timestamp_ms));
+  // Constructed at the same time as the first RTCP and should therefore be
+  // mapped to zero.
+  EXPECT_EQ(0, timestamp_ms);
+}
+
+TEST(UpdateRtcpMeasurementTests, InjectRtcpSr) {
+  const uint32_t kNtpSec = 10;
+  const uint32_t kNtpFrac = 12345;
+  const uint32_t kTs = 0x12345678;
+  bool new_sr;
+  RtpToNtpEstimator estimator;
+  EXPECT_TRUE(estimator.UpdateMeasurements(kNtpSec, kNtpFrac, kTs, &new_sr));
+  EXPECT_TRUE(new_sr);
+  EXPECT_EQ(1u, estimator.measurements().size());
+  EXPECT_EQ(kNtpSec, estimator.measurements().front().ntp_time.seconds());
+  EXPECT_EQ(kNtpFrac, estimator.measurements().front().ntp_time.fractions());
+  EXPECT_EQ(kTs, estimator.measurements().front().rtp_timestamp);
+  // Add second report.
+  EXPECT_TRUE(estimator.UpdateMeasurements(kNtpSec, kNtpFrac + kOneMsInNtpFrac,
+                                           kTs + 1, &new_sr));
+  EXPECT_TRUE(new_sr);
+  EXPECT_EQ(2u, estimator.measurements().size());
+  EXPECT_EQ(kTs + 1, estimator.measurements().front().rtp_timestamp);
+  EXPECT_EQ(kTs + 0, estimator.measurements().back().rtp_timestamp);
+  // List should contain last two reports.
+  EXPECT_TRUE(estimator.UpdateMeasurements(
+      kNtpSec, kNtpFrac + 2 * kOneMsInNtpFrac, kTs + 2, &new_sr));
+  EXPECT_EQ(2u, estimator.measurements().size());
+  EXPECT_EQ(kTs + 2, estimator.measurements().front().rtp_timestamp);
+  EXPECT_EQ(kTs + 1, estimator.measurements().back().rtp_timestamp);
+}
+
+TEST(UpdateRtcpMeasurementTests, FailsForZeroNtp) {
+  RtpToNtpEstimator estimator;
+  uint32_t ntp_sec = 0;
+  uint32_t ntp_frac = 0;
+  uint32_t timestamp = 0x12345678;
+  bool new_sr;
+  EXPECT_FALSE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  EXPECT_FALSE(new_sr);
+  EXPECT_EQ(0u, estimator.measurements().size());
+}
+
+TEST(UpdateRtcpMeasurementTests, FailsForEqualNtp) {
+  RtpToNtpEstimator estimator;
+  uint32_t ntp_sec = 0;
+  uint32_t ntp_frac = 699925050;
+  uint32_t timestamp = 0x12345678;
+  bool new_sr;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  EXPECT_TRUE(new_sr);
+  EXPECT_EQ(1u, estimator.measurements().size());
+  // Ntp time already added, list not updated.
+  ++timestamp;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  EXPECT_FALSE(new_sr);
+  EXPECT_EQ(1u, estimator.measurements().size());
+}
+
+TEST(UpdateRtcpMeasurementTests, FailsForOldNtp) {
+  RtpToNtpEstimator estimator;
+  uint32_t ntp_sec = 1;
+  uint32_t ntp_frac = 699925050;
+  uint32_t timestamp = 0x12345678;
+  bool new_sr;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  EXPECT_TRUE(new_sr);
+  EXPECT_EQ(1u, estimator.measurements().size());
+  // Old ntp time, list not updated.
+  ntp_frac -= kOneMsInNtpFrac;
+  timestamp += kTimestampTicksPerMs;
+  EXPECT_FALSE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  EXPECT_EQ(1u, estimator.measurements().size());
+}
+
+TEST(UpdateRtcpMeasurementTests, FailsForEqualTimestamp) {
+  RtpToNtpEstimator estimator;
+  uint32_t ntp_sec = 0;
+  uint32_t ntp_frac = 2;
+  uint32_t timestamp = 0x12345678;
+  bool new_sr;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  EXPECT_TRUE(new_sr);
+  EXPECT_EQ(1u, estimator.measurements().size());
+  // Timestamp already added, list not updated.
+  ++ntp_frac;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  EXPECT_FALSE(new_sr);
+  EXPECT_EQ(1u, estimator.measurements().size());
+}
+
+TEST(UpdateRtcpMeasurementTests, FailsForOldRtpTimestamp) {
+  RtpToNtpEstimator estimator;
+  uint32_t ntp_sec = 0;
+  uint32_t ntp_frac = 2;
+  uint32_t timestamp = 0x12345678;
+  bool new_sr;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  EXPECT_TRUE(new_sr);
+  EXPECT_EQ(1u, estimator.measurements().size());
+  // Old timestamp, list not updated.
+  ntp_frac += kOneMsInNtpFrac;
+  timestamp -= kTimestampTicksPerMs;
+  EXPECT_FALSE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  EXPECT_FALSE(new_sr);
+  EXPECT_EQ(1u, estimator.measurements().size());
+}
+
+TEST(UpdateRtcpMeasurementTests, VerifyParameters) {
+  RtpToNtpEstimator estimator;
+  uint32_t ntp_sec = 1;
+  uint32_t ntp_frac = 2;
+  uint32_t timestamp = 0x12345678;
+  bool new_sr;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  EXPECT_TRUE(new_sr);
+  EXPECT_FALSE(estimator.params().calculated);
+  // Add second report, parameters should be calculated.
+  ntp_frac += kOneMsInNtpFrac;
+  timestamp += kTimestampTicksPerMs;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  EXPECT_TRUE(estimator.params().calculated);
+  EXPECT_DOUBLE_EQ(90.0, estimator.params().frequency_khz);
+  EXPECT_NE(0.0, estimator.params().offset_ms);
+}
+
+TEST(RtpToNtpTests, FailsForNoParameters) {
+  RtpToNtpEstimator estimator;
+  uint32_t ntp_sec = 1;
+  uint32_t ntp_frac = 2;
+  uint32_t timestamp = 0x12345678;
+  bool new_sr;
+  EXPECT_TRUE(
+      estimator.UpdateMeasurements(ntp_sec, ntp_frac, timestamp, &new_sr));
+  EXPECT_EQ(1u, estimator.measurements().size());
+  // Parameters are not calculated, conversion of RTP to NTP time should fail.
+  EXPECT_FALSE(estimator.params().calculated);
+  int64_t timestamp_ms = -1;
+  EXPECT_FALSE(estimator.Estimate(timestamp, &timestamp_ms));
+}
+
+};  // namespace webrtc