webrtc/modules/module_common_types_unittest.cc - external/webrtc - Git at Google

 /*
  *  Copyright (c) 2013 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/modules/include/module_common_types.h"

 #include <string.h>  // memcmp

 #include "webrtc/test/gtest.h"

 namespace webrtc {

 namespace {

 bool AllSamplesAre(int16_t sample, const AudioFrame& frame) {
   const int16_t* frame_data = frame.data();
   for (size_t i = 0; i < AudioFrame::kMaxDataSizeSamples; i++) {
     if (frame_data[i] != sample) {
       return false;
     }
   }
   return true;
 }

 constexpr int kId = 16;
 constexpr uint32_t kTimestamp = 27;
 constexpr int kSampleRateHz = 16000;
 constexpr size_t kNumChannels = 1;
 constexpr size_t kSamplesPerChannel = kSampleRateHz / 100;

 }  // namespace

 TEST(AudioFrameTest, FrameStartsMuted) {
   AudioFrame frame;
   EXPECT_TRUE(frame.muted());
   EXPECT_TRUE(AllSamplesAre(0, frame));
 }

 TEST(AudioFrameTest, UnmutedFrameIsInitiallyZeroed) {
   AudioFrame frame;
   frame.mutable_data();
   EXPECT_FALSE(frame.muted());
   EXPECT_TRUE(AllSamplesAre(0, frame));
 }

 TEST(AudioFrameTest, MutedFrameBufferIsZeroed) {
   AudioFrame frame;
   int16_t* frame_data = frame.mutable_data();
   for (size_t i = 0; i < AudioFrame::kMaxDataSizeSamples; i++) {
     frame_data[i] = 17;
   }
   ASSERT_TRUE(AllSamplesAre(17, frame));
   frame.Mute();
   EXPECT_TRUE(frame.muted());
   EXPECT_TRUE(AllSamplesAre(0, frame));
 }

 TEST(AudioFrameTest, UpdateFrame) {
   AudioFrame frame;
   int16_t samples[kNumChannels * kSamplesPerChannel] = {17};
   frame.UpdateFrame(kId, kTimestamp, samples, kSamplesPerChannel, kSampleRateHz,
                     AudioFrame::kPLC, AudioFrame::kVadActive, kNumChannels);

   EXPECT_EQ(kId, frame.id_);
   EXPECT_EQ(kTimestamp, frame.timestamp_);
   EXPECT_EQ(kSamplesPerChannel, frame.samples_per_channel_);
   EXPECT_EQ(kSampleRateHz, frame.sample_rate_hz_);
   EXPECT_EQ(AudioFrame::kPLC, frame.speech_type_);
   EXPECT_EQ(AudioFrame::kVadActive, frame.vad_activity_);
   EXPECT_EQ(kNumChannels, frame.num_channels_);

   EXPECT_FALSE(frame.muted());
   EXPECT_EQ(0, memcmp(samples, frame.data(), sizeof(samples)));

   frame.UpdateFrame(kId, kTimestamp, nullptr /* data*/, kSamplesPerChannel,
                     kSampleRateHz, AudioFrame::kPLC, AudioFrame::kVadActive,
                     kNumChannels);
   EXPECT_TRUE(frame.muted());
   EXPECT_TRUE(AllSamplesAre(0, frame));
 }

 TEST(AudioFrameTest, CopyFrom) {
   AudioFrame frame1;
   AudioFrame frame2;

   int16_t samples[kNumChannels * kSamplesPerChannel] = {17};
   frame2.UpdateFrame(kId, kTimestamp, samples, kSamplesPerChannel,
                      kSampleRateHz, AudioFrame::kPLC, AudioFrame::kVadActive,
                      kNumChannels);
   frame1.CopyFrom(frame2);

   EXPECT_EQ(frame2.id_, frame1.id_);
   EXPECT_EQ(frame2.timestamp_, frame1.timestamp_);
   EXPECT_EQ(frame2.samples_per_channel_, frame1.samples_per_channel_);
   EXPECT_EQ(frame2.sample_rate_hz_, frame1.sample_rate_hz_);
   EXPECT_EQ(frame2.speech_type_, frame1.speech_type_);
   EXPECT_EQ(frame2.vad_activity_, frame1.vad_activity_);
   EXPECT_EQ(frame2.num_channels_, frame1.num_channels_);

   EXPECT_EQ(frame2.muted(), frame1.muted());
   EXPECT_EQ(0, memcmp(frame2.data(), frame1.data(), sizeof(samples)));

   frame2.UpdateFrame(kId, kTimestamp, nullptr /* data */, kSamplesPerChannel,
                      kSampleRateHz, AudioFrame::kPLC, AudioFrame::kVadActive,
                      kNumChannels);
   frame1.CopyFrom(frame2);

   EXPECT_EQ(frame2.muted(), frame1.muted());
   EXPECT_EQ(0, memcmp(frame2.data(), frame1.data(), sizeof(samples)));
 }

 TEST(IsNewerSequenceNumber, Equal) {
   EXPECT_FALSE(IsNewerSequenceNumber(0x0001, 0x0001));
 }

 TEST(IsNewerSequenceNumber, NoWrap) {
   EXPECT_TRUE(IsNewerSequenceNumber(0xFFFF, 0xFFFE));
   EXPECT_TRUE(IsNewerSequenceNumber(0x0001, 0x0000));
   EXPECT_TRUE(IsNewerSequenceNumber(0x0100, 0x00FF));
 }

 TEST(IsNewerSequenceNumber, ForwardWrap) {
   EXPECT_TRUE(IsNewerSequenceNumber(0x0000, 0xFFFF));
   EXPECT_TRUE(IsNewerSequenceNumber(0x0000, 0xFF00));
   EXPECT_TRUE(IsNewerSequenceNumber(0x00FF, 0xFFFF));
   EXPECT_TRUE(IsNewerSequenceNumber(0x00FF, 0xFF00));
 }

 TEST(IsNewerSequenceNumber, BackwardWrap) {
   EXPECT_FALSE(IsNewerSequenceNumber(0xFFFF, 0x0000));
   EXPECT_FALSE(IsNewerSequenceNumber(0xFF00, 0x0000));
   EXPECT_FALSE(IsNewerSequenceNumber(0xFFFF, 0x00FF));
   EXPECT_FALSE(IsNewerSequenceNumber(0xFF00, 0x00FF));
 }

 TEST(IsNewerSequenceNumber, HalfWayApart) {
   EXPECT_TRUE(IsNewerSequenceNumber(0x8000, 0x0000));
   EXPECT_FALSE(IsNewerSequenceNumber(0x0000, 0x8000));
 }

 TEST(IsNewerTimestamp, Equal) {
   EXPECT_FALSE(IsNewerTimestamp(0x00000001, 0x000000001));
 }

 TEST(IsNewerTimestamp, NoWrap) {
   EXPECT_TRUE(IsNewerTimestamp(0xFFFFFFFF, 0xFFFFFFFE));
   EXPECT_TRUE(IsNewerTimestamp(0x00000001, 0x00000000));
   EXPECT_TRUE(IsNewerTimestamp(0x00010000, 0x0000FFFF));
 }

 TEST(IsNewerTimestamp, ForwardWrap) {
   EXPECT_TRUE(IsNewerTimestamp(0x00000000, 0xFFFFFFFF));
   EXPECT_TRUE(IsNewerTimestamp(0x00000000, 0xFFFF0000));
   EXPECT_TRUE(IsNewerTimestamp(0x0000FFFF, 0xFFFFFFFF));
   EXPECT_TRUE(IsNewerTimestamp(0x0000FFFF, 0xFFFF0000));
 }

 TEST(IsNewerTimestamp, BackwardWrap) {
   EXPECT_FALSE(IsNewerTimestamp(0xFFFFFFFF, 0x00000000));
   EXPECT_FALSE(IsNewerTimestamp(0xFFFF0000, 0x00000000));
   EXPECT_FALSE(IsNewerTimestamp(0xFFFFFFFF, 0x0000FFFF));
   EXPECT_FALSE(IsNewerTimestamp(0xFFFF0000, 0x0000FFFF));
 }

 TEST(IsNewerTimestamp, HalfWayApart) {
   EXPECT_TRUE(IsNewerTimestamp(0x80000000, 0x00000000));
   EXPECT_FALSE(IsNewerTimestamp(0x00000000, 0x80000000));
 }

 TEST(LatestSequenceNumber, NoWrap) {
   EXPECT_EQ(0xFFFFu, LatestSequenceNumber(0xFFFF, 0xFFFE));
   EXPECT_EQ(0x0001u, LatestSequenceNumber(0x0001, 0x0000));
   EXPECT_EQ(0x0100u, LatestSequenceNumber(0x0100, 0x00FF));

   EXPECT_EQ(0xFFFFu, LatestSequenceNumber(0xFFFE, 0xFFFF));
   EXPECT_EQ(0x0001u, LatestSequenceNumber(0x0000, 0x0001));
   EXPECT_EQ(0x0100u, LatestSequenceNumber(0x00FF, 0x0100));
 }

 TEST(LatestSequenceNumber, Wrap) {
   EXPECT_EQ(0x0000u, LatestSequenceNumber(0x0000, 0xFFFF));
   EXPECT_EQ(0x0000u, LatestSequenceNumber(0x0000, 0xFF00));
   EXPECT_EQ(0x00FFu, LatestSequenceNumber(0x00FF, 0xFFFF));
   EXPECT_EQ(0x00FFu, LatestSequenceNumber(0x00FF, 0xFF00));

   EXPECT_EQ(0x0000u, LatestSequenceNumber(0xFFFF, 0x0000));
   EXPECT_EQ(0x0000u, LatestSequenceNumber(0xFF00, 0x0000));
   EXPECT_EQ(0x00FFu, LatestSequenceNumber(0xFFFF, 0x00FF));
   EXPECT_EQ(0x00FFu, LatestSequenceNumber(0xFF00, 0x00FF));
 }

 TEST(LatestTimestamp, NoWrap) {
   EXPECT_EQ(0xFFFFFFFFu, LatestTimestamp(0xFFFFFFFF, 0xFFFFFFFE));
   EXPECT_EQ(0x00000001u, LatestTimestamp(0x00000001, 0x00000000));
   EXPECT_EQ(0x00010000u, LatestTimestamp(0x00010000, 0x0000FFFF));
 }

 TEST(LatestTimestamp, Wrap) {
   EXPECT_EQ(0x00000000u, LatestTimestamp(0x00000000, 0xFFFFFFFF));
   EXPECT_EQ(0x00000000u, LatestTimestamp(0x00000000, 0xFFFF0000));
   EXPECT_EQ(0x0000FFFFu, LatestTimestamp(0x0000FFFF, 0xFFFFFFFF));
   EXPECT_EQ(0x0000FFFFu, LatestTimestamp(0x0000FFFF, 0xFFFF0000));

   EXPECT_EQ(0x00000000u, LatestTimestamp(0xFFFFFFFF, 0x00000000));
   EXPECT_EQ(0x00000000u, LatestTimestamp(0xFFFF0000, 0x00000000));
   EXPECT_EQ(0x0000FFFFu, LatestTimestamp(0xFFFFFFFF, 0x0000FFFF));
   EXPECT_EQ(0x0000FFFFu, LatestTimestamp(0xFFFF0000, 0x0000FFFF));
 }


 TEST(SequenceNumberUnwrapper, Limits) {
   SequenceNumberUnwrapper unwrapper;

   EXPECT_EQ(0, unwrapper.Unwrap(0));
   EXPECT_EQ(0x8000, unwrapper.Unwrap(0x8000));
   // Delta is exactly 0x8000 but current is lower than input, wrap backwards.
   EXPECT_EQ(0, unwrapper.Unwrap(0));

   EXPECT_EQ(0x8000, unwrapper.Unwrap(0x8000));
   EXPECT_EQ(0xFFFF, unwrapper.Unwrap(0xFFFF));
   EXPECT_EQ(0x10000, unwrapper.Unwrap(0));
   EXPECT_EQ(0xFFFF, unwrapper.Unwrap(0xFFFF));
   EXPECT_EQ(0x8000, unwrapper.Unwrap(0x8000));
   EXPECT_EQ(0, unwrapper.Unwrap(0));

   // Don't allow negative values.
   EXPECT_EQ(0xFFFF, unwrapper.Unwrap(0xFFFF));
 }

 TEST(SequenceNumberUnwrapper, ForwardWraps) {
   int64_t seq = 0;
   SequenceNumberUnwrapper unwrapper;

   const int kMaxIncrease = 0x8000 - 1;
   const int kNumWraps = 4;
   for (int i = 0; i < kNumWraps * 2; ++i) {
     int64_t unwrapped = unwrapper.Unwrap(static_cast<uint16_t>(seq & 0xFFFF));
     EXPECT_EQ(seq, unwrapped);
     seq += kMaxIncrease;
   }

   unwrapper.UpdateLast(0);
   for (int seq = 0; seq < kNumWraps * 0xFFFF; ++seq) {
     int64_t unwrapped = unwrapper.Unwrap(static_cast<uint16_t>(seq & 0xFFFF));
     EXPECT_EQ(seq, unwrapped);
   }
 }

 TEST(SequenceNumberUnwrapper, BackwardWraps) {
   SequenceNumberUnwrapper unwrapper;

   const int kMaxDecrease = 0x8000 - 1;
   const int kNumWraps = 4;
   int64_t seq = kNumWraps * 2 * kMaxDecrease;
   unwrapper.UpdateLast(seq);
   for (int i = kNumWraps * 2; i >= 0; --i) {
     int64_t unwrapped = unwrapper.Unwrap(static_cast<uint16_t>(seq & 0xFFFF));
     EXPECT_EQ(seq, unwrapped);
     seq -= kMaxDecrease;
   }

   seq = kNumWraps * 0xFFFF;
   unwrapper.UpdateLast(seq);
   for (; seq >= 0; --seq) {
     int64_t unwrapped = unwrapper.Unwrap(static_cast<uint16_t>(seq & 0xFFFF));
     EXPECT_EQ(seq, unwrapped);
   }
 }

 TEST(TimestampUnwrapper, Limits) {
   TimestampUnwrapper unwrapper;

   EXPECT_EQ(0, unwrapper.Unwrap(0));
   EXPECT_EQ(0x80000000, unwrapper.Unwrap(0x80000000));
   // Delta is exactly 0x80000000 but current is lower than input, wrap
   // backwards.
   EXPECT_EQ(0, unwrapper.Unwrap(0));

   EXPECT_EQ(0x80000000, unwrapper.Unwrap(0x80000000));
   EXPECT_EQ(0xFFFFFFFF, unwrapper.Unwrap(0xFFFFFFFF));
   EXPECT_EQ(0x100000000, unwrapper.Unwrap(0x00000000));
   EXPECT_EQ(0xFFFFFFFF, unwrapper.Unwrap(0xFFFFFFFF));
   EXPECT_EQ(0x80000000, unwrapper.Unwrap(0x80000000));
   EXPECT_EQ(0, unwrapper.Unwrap(0));

   // Don't allow negative values.
   EXPECT_EQ(0xFFFFFFFF, unwrapper.Unwrap(0xFFFFFFFF));
 }

 TEST(TimestampUnwrapper, ForwardWraps) {
   int64_t ts = 0;
   TimestampUnwrapper unwrapper;

   const int64_t kMaxIncrease = 0x80000000 - 1;
   const int kNumWraps = 4;
   for (int i = 0; i < kNumWraps * 2; ++i) {
     int64_t unwrapped =
         unwrapper.Unwrap(static_cast<uint32_t>(ts & 0xFFFFFFFF));
     EXPECT_EQ(ts, unwrapped);
     ts += kMaxIncrease;
   }
 }

 TEST(TimestampUnwrapper, BackwardWraps) {
   TimestampUnwrapper unwrapper;

   const int64_t kMaxDecrease = 0x80000000 - 1;
   const int kNumWraps = 4;
   int64_t ts = kNumWraps * 2 * kMaxDecrease;
   unwrapper.UpdateLast(ts);
   for (int i = 0; i <= kNumWraps * 2; ++i) {
     int64_t unwrapped =
         unwrapper.Unwrap(static_cast<uint32_t>(ts & 0xFFFFFFFF));
     EXPECT_EQ(ts, unwrapped);
     ts -= kMaxDecrease;
   }
 }

 }  // namespace webrtc
	/*
	* Copyright (c) 2013 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/modules/include/module_common_types.h"

	#include <string.h> // memcmp

	#include "webrtc/test/gtest.h"

	namespace webrtc {

	namespace {

	bool AllSamplesAre(int16_t sample, const AudioFrame& frame) {
	const int16_t* frame_data = frame.data();
	for (size_t i = 0; i < AudioFrame::kMaxDataSizeSamples; i++) {
	if (frame_data[i] != sample) {
	return false;
	}
	}
	return true;
	}

	constexpr int kId = 16;
	constexpr uint32_t kTimestamp = 27;
	constexpr int kSampleRateHz = 16000;
	constexpr size_t kNumChannels = 1;
	constexpr size_t kSamplesPerChannel = kSampleRateHz / 100;

	} // namespace

	TEST(AudioFrameTest, FrameStartsMuted) {
	AudioFrame frame;
	EXPECT_TRUE(frame.muted());
	EXPECT_TRUE(AllSamplesAre(0, frame));
	}

	TEST(AudioFrameTest, UnmutedFrameIsInitiallyZeroed) {
	AudioFrame frame;
	frame.mutable_data();
	EXPECT_FALSE(frame.muted());
	EXPECT_TRUE(AllSamplesAre(0, frame));
	}

	TEST(AudioFrameTest, MutedFrameBufferIsZeroed) {
	AudioFrame frame;
	int16_t* frame_data = frame.mutable_data();
	for (size_t i = 0; i < AudioFrame::kMaxDataSizeSamples; i++) {
	frame_data[i] = 17;
	}
	ASSERT_TRUE(AllSamplesAre(17, frame));
	frame.Mute();
	EXPECT_TRUE(frame.muted());
	EXPECT_TRUE(AllSamplesAre(0, frame));
	}

	TEST(AudioFrameTest, UpdateFrame) {
	AudioFrame frame;
	int16_t samples[kNumChannels * kSamplesPerChannel] = {17};
	frame.UpdateFrame(kId, kTimestamp, samples, kSamplesPerChannel, kSampleRateHz,
	AudioFrame::kPLC, AudioFrame::kVadActive, kNumChannels);

	EXPECT_EQ(kId, frame.id_);
	EXPECT_EQ(kTimestamp, frame.timestamp_);
	EXPECT_EQ(kSamplesPerChannel, frame.samples_per_channel_);
	EXPECT_EQ(kSampleRateHz, frame.sample_rate_hz_);
	EXPECT_EQ(AudioFrame::kPLC, frame.speech_type_);
	EXPECT_EQ(AudioFrame::kVadActive, frame.vad_activity_);
	EXPECT_EQ(kNumChannels, frame.num_channels_);

	EXPECT_FALSE(frame.muted());
	EXPECT_EQ(0, memcmp(samples, frame.data(), sizeof(samples)));

	frame.UpdateFrame(kId, kTimestamp, nullptr /* data*/, kSamplesPerChannel,
	kSampleRateHz, AudioFrame::kPLC, AudioFrame::kVadActive,
	kNumChannels);
	EXPECT_TRUE(frame.muted());
	EXPECT_TRUE(AllSamplesAre(0, frame));
	}

	TEST(AudioFrameTest, CopyFrom) {
	AudioFrame frame1;
	AudioFrame frame2;

	int16_t samples[kNumChannels * kSamplesPerChannel] = {17};
	frame2.UpdateFrame(kId, kTimestamp, samples, kSamplesPerChannel,
	kSampleRateHz, AudioFrame::kPLC, AudioFrame::kVadActive,
	kNumChannels);
	frame1.CopyFrom(frame2);

	EXPECT_EQ(frame2.id_, frame1.id_);
	EXPECT_EQ(frame2.timestamp_, frame1.timestamp_);
	EXPECT_EQ(frame2.samples_per_channel_, frame1.samples_per_channel_);
	EXPECT_EQ(frame2.sample_rate_hz_, frame1.sample_rate_hz_);
	EXPECT_EQ(frame2.speech_type_, frame1.speech_type_);
	EXPECT_EQ(frame2.vad_activity_, frame1.vad_activity_);
	EXPECT_EQ(frame2.num_channels_, frame1.num_channels_);

	EXPECT_EQ(frame2.muted(), frame1.muted());
	EXPECT_EQ(0, memcmp(frame2.data(), frame1.data(), sizeof(samples)));

	frame2.UpdateFrame(kId, kTimestamp, nullptr /* data */, kSamplesPerChannel,
	kSampleRateHz, AudioFrame::kPLC, AudioFrame::kVadActive,
	kNumChannels);
	frame1.CopyFrom(frame2);

	EXPECT_EQ(frame2.muted(), frame1.muted());
	EXPECT_EQ(0, memcmp(frame2.data(), frame1.data(), sizeof(samples)));
	}

	TEST(IsNewerSequenceNumber, Equal) {
	EXPECT_FALSE(IsNewerSequenceNumber(0x0001, 0x0001));
	}

	TEST(IsNewerSequenceNumber, NoWrap) {
	EXPECT_TRUE(IsNewerSequenceNumber(0xFFFF, 0xFFFE));
	EXPECT_TRUE(IsNewerSequenceNumber(0x0001, 0x0000));
	EXPECT_TRUE(IsNewerSequenceNumber(0x0100, 0x00FF));
	}

	TEST(IsNewerSequenceNumber, ForwardWrap) {
	EXPECT_TRUE(IsNewerSequenceNumber(0x0000, 0xFFFF));
	EXPECT_TRUE(IsNewerSequenceNumber(0x0000, 0xFF00));
	EXPECT_TRUE(IsNewerSequenceNumber(0x00FF, 0xFFFF));
	EXPECT_TRUE(IsNewerSequenceNumber(0x00FF, 0xFF00));
	}

	TEST(IsNewerSequenceNumber, BackwardWrap) {
	EXPECT_FALSE(IsNewerSequenceNumber(0xFFFF, 0x0000));
	EXPECT_FALSE(IsNewerSequenceNumber(0xFF00, 0x0000));
	EXPECT_FALSE(IsNewerSequenceNumber(0xFFFF, 0x00FF));
	EXPECT_FALSE(IsNewerSequenceNumber(0xFF00, 0x00FF));
	}

	TEST(IsNewerSequenceNumber, HalfWayApart) {
	EXPECT_TRUE(IsNewerSequenceNumber(0x8000, 0x0000));
	EXPECT_FALSE(IsNewerSequenceNumber(0x0000, 0x8000));
	}

	TEST(IsNewerTimestamp, Equal) {
	EXPECT_FALSE(IsNewerTimestamp(0x00000001, 0x000000001));
	}

	TEST(IsNewerTimestamp, NoWrap) {
	EXPECT_TRUE(IsNewerTimestamp(0xFFFFFFFF, 0xFFFFFFFE));
	EXPECT_TRUE(IsNewerTimestamp(0x00000001, 0x00000000));
	EXPECT_TRUE(IsNewerTimestamp(0x00010000, 0x0000FFFF));
	}

	TEST(IsNewerTimestamp, ForwardWrap) {
	EXPECT_TRUE(IsNewerTimestamp(0x00000000, 0xFFFFFFFF));
	EXPECT_TRUE(IsNewerTimestamp(0x00000000, 0xFFFF0000));
	EXPECT_TRUE(IsNewerTimestamp(0x0000FFFF, 0xFFFFFFFF));
	EXPECT_TRUE(IsNewerTimestamp(0x0000FFFF, 0xFFFF0000));
	}

	TEST(IsNewerTimestamp, BackwardWrap) {
	EXPECT_FALSE(IsNewerTimestamp(0xFFFFFFFF, 0x00000000));
	EXPECT_FALSE(IsNewerTimestamp(0xFFFF0000, 0x00000000));
	EXPECT_FALSE(IsNewerTimestamp(0xFFFFFFFF, 0x0000FFFF));
	EXPECT_FALSE(IsNewerTimestamp(0xFFFF0000, 0x0000FFFF));
	}

	TEST(IsNewerTimestamp, HalfWayApart) {
	EXPECT_TRUE(IsNewerTimestamp(0x80000000, 0x00000000));
	EXPECT_FALSE(IsNewerTimestamp(0x00000000, 0x80000000));
	}

	TEST(LatestSequenceNumber, NoWrap) {
	EXPECT_EQ(0xFFFFu, LatestSequenceNumber(0xFFFF, 0xFFFE));
	EXPECT_EQ(0x0001u, LatestSequenceNumber(0x0001, 0x0000));
	EXPECT_EQ(0x0100u, LatestSequenceNumber(0x0100, 0x00FF));

	EXPECT_EQ(0xFFFFu, LatestSequenceNumber(0xFFFE, 0xFFFF));
	EXPECT_EQ(0x0001u, LatestSequenceNumber(0x0000, 0x0001));
	EXPECT_EQ(0x0100u, LatestSequenceNumber(0x00FF, 0x0100));
	}

	TEST(LatestSequenceNumber, Wrap) {
	EXPECT_EQ(0x0000u, LatestSequenceNumber(0x0000, 0xFFFF));
	EXPECT_EQ(0x0000u, LatestSequenceNumber(0x0000, 0xFF00));
	EXPECT_EQ(0x00FFu, LatestSequenceNumber(0x00FF, 0xFFFF));
	EXPECT_EQ(0x00FFu, LatestSequenceNumber(0x00FF, 0xFF00));

	EXPECT_EQ(0x0000u, LatestSequenceNumber(0xFFFF, 0x0000));
	EXPECT_EQ(0x0000u, LatestSequenceNumber(0xFF00, 0x0000));
	EXPECT_EQ(0x00FFu, LatestSequenceNumber(0xFFFF, 0x00FF));
	EXPECT_EQ(0x00FFu, LatestSequenceNumber(0xFF00, 0x00FF));
	}

	TEST(LatestTimestamp, NoWrap) {
	EXPECT_EQ(0xFFFFFFFFu, LatestTimestamp(0xFFFFFFFF, 0xFFFFFFFE));
	EXPECT_EQ(0x00000001u, LatestTimestamp(0x00000001, 0x00000000));
	EXPECT_EQ(0x00010000u, LatestTimestamp(0x00010000, 0x0000FFFF));
	}

	TEST(LatestTimestamp, Wrap) {
	EXPECT_EQ(0x00000000u, LatestTimestamp(0x00000000, 0xFFFFFFFF));
	EXPECT_EQ(0x00000000u, LatestTimestamp(0x00000000, 0xFFFF0000));
	EXPECT_EQ(0x0000FFFFu, LatestTimestamp(0x0000FFFF, 0xFFFFFFFF));
	EXPECT_EQ(0x0000FFFFu, LatestTimestamp(0x0000FFFF, 0xFFFF0000));

	EXPECT_EQ(0x00000000u, LatestTimestamp(0xFFFFFFFF, 0x00000000));
	EXPECT_EQ(0x00000000u, LatestTimestamp(0xFFFF0000, 0x00000000));
	EXPECT_EQ(0x0000FFFFu, LatestTimestamp(0xFFFFFFFF, 0x0000FFFF));
	EXPECT_EQ(0x0000FFFFu, LatestTimestamp(0xFFFF0000, 0x0000FFFF));
	}


	TEST(SequenceNumberUnwrapper, Limits) {
	SequenceNumberUnwrapper unwrapper;

	EXPECT_EQ(0, unwrapper.Unwrap(0));
	EXPECT_EQ(0x8000, unwrapper.Unwrap(0x8000));
	// Delta is exactly 0x8000 but current is lower than input, wrap backwards.
	EXPECT_EQ(0, unwrapper.Unwrap(0));

	EXPECT_EQ(0x8000, unwrapper.Unwrap(0x8000));
	EXPECT_EQ(0xFFFF, unwrapper.Unwrap(0xFFFF));
	EXPECT_EQ(0x10000, unwrapper.Unwrap(0));
	EXPECT_EQ(0xFFFF, unwrapper.Unwrap(0xFFFF));
	EXPECT_EQ(0x8000, unwrapper.Unwrap(0x8000));
	EXPECT_EQ(0, unwrapper.Unwrap(0));

	// Don't allow negative values.
	EXPECT_EQ(0xFFFF, unwrapper.Unwrap(0xFFFF));
	}

	TEST(SequenceNumberUnwrapper, ForwardWraps) {
	int64_t seq = 0;
	SequenceNumberUnwrapper unwrapper;

	const int kMaxIncrease = 0x8000 - 1;
	const int kNumWraps = 4;
	for (int i = 0; i < kNumWraps * 2; ++i) {
	int64_t unwrapped = unwrapper.Unwrap(static_cast<uint16_t>(seq & 0xFFFF));
	EXPECT_EQ(seq, unwrapped);
	seq += kMaxIncrease;
	}

	unwrapper.UpdateLast(0);
	for (int seq = 0; seq < kNumWraps * 0xFFFF; ++seq) {
	int64_t unwrapped = unwrapper.Unwrap(static_cast<uint16_t>(seq & 0xFFFF));
	EXPECT_EQ(seq, unwrapped);
	}
	}

	TEST(SequenceNumberUnwrapper, BackwardWraps) {
	SequenceNumberUnwrapper unwrapper;

	const int kMaxDecrease = 0x8000 - 1;
	const int kNumWraps = 4;
	int64_t seq = kNumWraps * 2 * kMaxDecrease;
	unwrapper.UpdateLast(seq);
	for (int i = kNumWraps * 2; i >= 0; --i) {
	int64_t unwrapped = unwrapper.Unwrap(static_cast<uint16_t>(seq & 0xFFFF));
	EXPECT_EQ(seq, unwrapped);
	seq -= kMaxDecrease;
	}

	seq = kNumWraps * 0xFFFF;
	unwrapper.UpdateLast(seq);
	for (; seq >= 0; --seq) {
	int64_t unwrapped = unwrapper.Unwrap(static_cast<uint16_t>(seq & 0xFFFF));
	EXPECT_EQ(seq, unwrapped);
	}
	}

	TEST(TimestampUnwrapper, Limits) {
	TimestampUnwrapper unwrapper;

	EXPECT_EQ(0, unwrapper.Unwrap(0));
	EXPECT_EQ(0x80000000, unwrapper.Unwrap(0x80000000));
	// Delta is exactly 0x80000000 but current is lower than input, wrap
	// backwards.
	EXPECT_EQ(0, unwrapper.Unwrap(0));

	EXPECT_EQ(0x80000000, unwrapper.Unwrap(0x80000000));
	EXPECT_EQ(0xFFFFFFFF, unwrapper.Unwrap(0xFFFFFFFF));
	EXPECT_EQ(0x100000000, unwrapper.Unwrap(0x00000000));
	EXPECT_EQ(0xFFFFFFFF, unwrapper.Unwrap(0xFFFFFFFF));
	EXPECT_EQ(0x80000000, unwrapper.Unwrap(0x80000000));
	EXPECT_EQ(0, unwrapper.Unwrap(0));

	// Don't allow negative values.
	EXPECT_EQ(0xFFFFFFFF, unwrapper.Unwrap(0xFFFFFFFF));
	}

	TEST(TimestampUnwrapper, ForwardWraps) {
	int64_t ts = 0;
	TimestampUnwrapper unwrapper;

	const int64_t kMaxIncrease = 0x80000000 - 1;
	const int kNumWraps = 4;
	for (int i = 0; i < kNumWraps * 2; ++i) {
	int64_t unwrapped =
	unwrapper.Unwrap(static_cast<uint32_t>(ts & 0xFFFFFFFF));
	EXPECT_EQ(ts, unwrapped);
	ts += kMaxIncrease;
	}
	}

	TEST(TimestampUnwrapper, BackwardWraps) {
	TimestampUnwrapper unwrapper;

	const int64_t kMaxDecrease = 0x80000000 - 1;
	const int kNumWraps = 4;
	int64_t ts = kNumWraps * 2 * kMaxDecrease;
	unwrapper.UpdateLast(ts);
	for (int i = 0; i <= kNumWraps * 2; ++i) {
	int64_t unwrapped =
	unwrapper.Unwrap(static_cast<uint32_t>(ts & 0xFFFFFFFF));
	EXPECT_EQ(ts, unwrapped);
	ts -= kMaxDecrease;
	}
	}

	} // namespace webrtc