text: /*
   *  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 "testing/gtest/include/gtest/gtest.h"
  #include "webrtc/system_wrappers/include/rtp_to_ntp.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) {
    RtcpList rtcp;
    uint32_t ntp_sec = 0;
    uint32_t ntp_frac = 0;
    uint32_t timestamp = 0;
    rtcp.push_front(RtcpMeasurement(ntp_sec, ntp_frac, timestamp));
    ntp_frac += kOneMsInNtpFrac;
    timestamp -= kTimestampTicksPerMs;
    rtcp.push_front(RtcpMeasurement(ntp_sec, ntp_frac, timestamp));
    ntp_frac += kOneMsInNtpFrac;
    timestamp -= kTimestampTicksPerMs;
    int64_t timestamp_in_ms = -1;
    // This expected to fail since it's highly unlikely that the older RTCP
    // has a much smaller RTP timestamp than the newer.
    EXPECT_FALSE(RtpToNtpMs(timestamp, rtcp, &timestamp_in_ms));
  }
  
  TEST(WrapAroundTests, NewRtcpWrapped) {
    RtcpList rtcp;
    uint32_t ntp_sec = 0;
    uint32_t ntp_frac = 0;
    uint32_t timestamp = 0xFFFFFFFF;
    rtcp.push_front(RtcpMeasurement(ntp_sec, ntp_frac, timestamp));
    ntp_frac += kOneMsInNtpFrac;
    timestamp += kTimestampTicksPerMs;
    rtcp.push_front(RtcpMeasurement(ntp_sec, ntp_frac, timestamp));
    int64_t timestamp_in_ms = -1;
    EXPECT_TRUE(RtpToNtpMs(rtcp.back().rtp_timestamp, rtcp, &timestamp_in_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_in_ms);
  }
  
  TEST(WrapAroundTests, RtpWrapped) {
    RtcpList rtcp;
    uint32_t ntp_sec = 0;
    uint32_t ntp_frac = 0;
    uint32_t timestamp = 0xFFFFFFFF - 2 * kTimestampTicksPerMs;
    rtcp.push_front(RtcpMeasurement(ntp_sec, ntp_frac, timestamp));
    ntp_frac += kOneMsInNtpFrac;
    timestamp += kTimestampTicksPerMs;
    rtcp.push_front(RtcpMeasurement(ntp_sec, ntp_frac, timestamp));
    ntp_frac += kOneMsInNtpFrac;
    timestamp += kTimestampTicksPerMs;
    int64_t timestamp_in_ms = -1;
    EXPECT_TRUE(RtpToNtpMs(timestamp, rtcp, &timestamp_in_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(2, timestamp_in_ms);
  }
  
  TEST(WrapAroundTests, OldRtp_RtcpsWrapped) {
    RtcpList rtcp;
    uint32_t ntp_sec = 0;
    uint32_t ntp_frac = 0;
    uint32_t timestamp = 0;
    rtcp.push_front(RtcpMeasurement(ntp_sec, ntp_frac, timestamp));
    ntp_frac += kOneMsInNtpFrac;
    timestamp += kTimestampTicksPerMs;
    rtcp.push_front(RtcpMeasurement(ntp_sec, ntp_frac, timestamp));
    ntp_frac += kOneMsInNtpFrac;
    timestamp -= 2*kTimestampTicksPerMs;
    int64_t timestamp_in_ms = -1;
    EXPECT_FALSE(RtpToNtpMs(timestamp, rtcp, &timestamp_in_ms));
  }
  
  TEST(WrapAroundTests, OldRtp_NewRtcpWrapped) {
    RtcpList rtcp;
    uint32_t ntp_sec = 0;
    uint32_t ntp_frac = 0;
    uint32_t timestamp = 0xFFFFFFFF;
    rtcp.push_front(RtcpMeasurement(ntp_sec, ntp_frac, timestamp));
    ntp_frac += kOneMsInNtpFrac;
    timestamp += kTimestampTicksPerMs;
    rtcp.push_front(RtcpMeasurement(ntp_sec, ntp_frac, timestamp));
    ntp_frac += kOneMsInNtpFrac;
    timestamp -= kTimestampTicksPerMs;
    int64_t timestamp_in_ms = -1;
    EXPECT_TRUE(RtpToNtpMs(timestamp, rtcp, &timestamp_in_ms));
    // Constructed at the same time as the first RTCP and should therefore be
    // mapped to zero.
    EXPECT_EQ(0, timestamp_in_ms);
  }
  
  TEST(WrapAroundTests, OldRtp_OldRtcpWrapped) {
    RtcpList rtcp;
    uint32_t ntp_sec = 0;
    uint32_t ntp_frac = 0;
    uint32_t timestamp = 0;
    rtcp.push_front(RtcpMeasurement(ntp_sec, ntp_frac, timestamp));
    ntp_frac += kOneMsInNtpFrac;
    timestamp -= kTimestampTicksPerMs;
    rtcp.push_front(RtcpMeasurement(ntp_sec, ntp_frac, timestamp));
    ntp_frac += kOneMsInNtpFrac;
    timestamp += 2*kTimestampTicksPerMs;
    int64_t timestamp_in_ms = -1;
    EXPECT_FALSE(RtpToNtpMs(timestamp, rtcp, &timestamp_in_ms));
  }
  };  // namespace webrtc
  