media/cast/receiver/frame_receiver_unittest.cc - platform/external/chromium_org - Git at Google

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include <deque>
 #include <utility>

 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "media/cast/cast_defines.h"
 #include "media/cast/cast_environment.h"
 #include "media/cast/logging/simple_event_subscriber.h"
 #include "media/cast/receiver/frame_receiver.h"
 #include "media/cast/rtcp/test_rtcp_packet_builder.h"
 #include "media/cast/test/fake_single_thread_task_runner.h"
 #include "media/cast/test/utility/default_config.h"
 #include "media/cast/transport/pacing/mock_paced_packet_sender.h"
 #include "testing/gmock/include/gmock/gmock.h"

 using ::testing::_;

 namespace media {
 namespace cast {

 namespace {

 const int kPacketSize = 1500;
 const uint32 kFirstFrameId = 1234;
 const int kPlayoutDelayMillis = 100;

 class FakeFrameClient {
  public:
   FakeFrameClient() : num_called_(0) {}
   virtual ~FakeFrameClient() {}

   void AddExpectedResult(uint32 expected_frame_id,
                          const base::TimeTicks& expected_playout_time) {
     expected_results_.push_back(
         std::make_pair(expected_frame_id, expected_playout_time));
   }

   void DeliverEncodedFrame(scoped_ptr<transport::EncodedFrame> frame) {
     SCOPED_TRACE(::testing::Message() << "num_called_ is " << num_called_);
     ASSERT_FALSE(!frame)
         << "If at shutdown: There were unsatisfied requests enqueued.";
     ASSERT_FALSE(expected_results_.empty());
     EXPECT_EQ(expected_results_.front().first, frame->frame_id);
     EXPECT_EQ(expected_results_.front().second, frame->reference_time);
     expected_results_.pop_front();
     ++num_called_;
   }

   int number_times_called() const { return num_called_; }

  private:
   std::deque<std::pair<uint32, base::TimeTicks> > expected_results_;
   int num_called_;

   DISALLOW_COPY_AND_ASSIGN(FakeFrameClient);
 };
 }  // namespace

 class FrameReceiverTest : public ::testing::Test {
  protected:
   FrameReceiverTest() {
     testing_clock_ = new base::SimpleTestTickClock();
     testing_clock_->Advance(base::TimeTicks::Now() - base::TimeTicks());
     start_time_ = testing_clock_->NowTicks();
     task_runner_ = new test::FakeSingleThreadTaskRunner(testing_clock_);

     cast_environment_ =
         new CastEnvironment(scoped_ptr<base::TickClock>(testing_clock_).Pass(),
                             task_runner_,
                             task_runner_,
                             task_runner_);
   }

   virtual ~FrameReceiverTest() {}

   virtual void SetUp() {
     payload_.assign(kPacketSize, 0);

     // Always start with a key frame.
     rtp_header_.is_key_frame = true;
     rtp_header_.frame_id = kFirstFrameId;
     rtp_header_.packet_id = 0;
     rtp_header_.max_packet_id = 0;
     rtp_header_.reference_frame_id = rtp_header_.frame_id;
     rtp_header_.rtp_timestamp = 0;
   }

   void CreateFrameReceiverOfAudio() {
     config_ = GetDefaultAudioReceiverConfig();
     config_.rtp_max_delay_ms = kPlayoutDelayMillis;

     receiver_.reset(new FrameReceiver(
         cast_environment_, config_, AUDIO_EVENT, &mock_transport_));
   }

   void CreateFrameReceiverOfVideo() {
     config_ = GetDefaultVideoReceiverConfig();
     config_.rtp_max_delay_ms = kPlayoutDelayMillis;
     // Note: Frame rate must divide 1000 without remainder so the test code
     // doesn't have to account for rounding errors.
     config_.max_frame_rate = 25;

     receiver_.reset(new FrameReceiver(
         cast_environment_, config_, VIDEO_EVENT, &mock_transport_));
   }

   void FeedOneFrameIntoReceiver() {
     // Note: For testing purposes, a frame consists of only a single packet.
     receiver_->ProcessParsedPacket(
         rtp_header_, payload_.data(), payload_.size());
   }

   void FeedLipSyncInfoIntoReceiver() {
     const base::TimeTicks now = testing_clock_->NowTicks();
     const int64 rtp_timestamp = (now - start_time_) *
         config_.frequency / base::TimeDelta::FromSeconds(1);
     CHECK_LE(0, rtp_timestamp);
     uint32 ntp_seconds;
     uint32 ntp_fraction;
     ConvertTimeTicksToNtp(now, &ntp_seconds, &ntp_fraction);
     TestRtcpPacketBuilder rtcp_packet;
     rtcp_packet.AddSrWithNtp(config_.incoming_ssrc,
                              ntp_seconds, ntp_fraction,
                              static_cast<uint32>(rtp_timestamp));
     ASSERT_TRUE(receiver_->ProcessPacket(rtcp_packet.GetPacket().Pass()));
   }

   FrameReceiverConfig config_;
   std::vector<uint8> payload_;
   RtpCastHeader rtp_header_;
   base::SimpleTestTickClock* testing_clock_;  // Owned by CastEnvironment.
   base::TimeTicks start_time_;
   transport::MockPacedPacketSender mock_transport_;
   scoped_refptr<test::FakeSingleThreadTaskRunner> task_runner_;
   scoped_refptr<CastEnvironment> cast_environment_;
   FakeFrameClient frame_client_;

   // Important for the FrameReceiver to be declared last, since its dependencies
   // must remain alive until after its destruction.
   scoped_ptr<FrameReceiver> receiver_;

   DISALLOW_COPY_AND_ASSIGN(FrameReceiverTest);
 };

 TEST_F(FrameReceiverTest, RejectsUnparsablePackets) {
   CreateFrameReceiverOfVideo();

   SimpleEventSubscriber event_subscriber;
   cast_environment_->Logging()->AddRawEventSubscriber(&event_subscriber);

   const bool success = receiver_->ProcessPacket(
       scoped_ptr<Packet>(new Packet(kPacketSize, 0xff)).Pass());
   EXPECT_FALSE(success);

   // Confirm no log events.
   std::vector<FrameEvent> frame_events;
   event_subscriber.GetFrameEventsAndReset(&frame_events);
   EXPECT_TRUE(frame_events.empty());
   cast_environment_->Logging()->RemoveRawEventSubscriber(&event_subscriber);
 }

 TEST_F(FrameReceiverTest, ReceivesOneFrame) {
   CreateFrameReceiverOfAudio();

   SimpleEventSubscriber event_subscriber;
   cast_environment_->Logging()->AddRawEventSubscriber(&event_subscriber);

   EXPECT_CALL(mock_transport_, SendRtcpPacket(_, _))
       .WillRepeatedly(testing::Return(true));

   FeedLipSyncInfoIntoReceiver();
   task_runner_->RunTasks();

   // Enqueue a request for a frame.
   receiver_->RequestEncodedFrame(
       base::Bind(&FakeFrameClient::DeliverEncodedFrame,
                  base::Unretained(&frame_client_)));

   // The request should not be satisfied since no packets have been received.
   task_runner_->RunTasks();
   EXPECT_EQ(0, frame_client_.number_times_called());

   // Deliver one frame to the receiver and expect to get one frame back.
   const base::TimeDelta target_playout_delay =
       base::TimeDelta::FromMilliseconds(kPlayoutDelayMillis);
   frame_client_.AddExpectedResult(
       kFirstFrameId, testing_clock_->NowTicks() + target_playout_delay);
   FeedOneFrameIntoReceiver();
   task_runner_->RunTasks();
   EXPECT_EQ(1, frame_client_.number_times_called());

   // Was the frame logged?
   std::vector<FrameEvent> frame_events;
   event_subscriber.GetFrameEventsAndReset(&frame_events);
   ASSERT_TRUE(!frame_events.empty());
   EXPECT_EQ(FRAME_ACK_SENT, frame_events.begin()->type);
   EXPECT_EQ(AUDIO_EVENT, frame_events.begin()->media_type);
   EXPECT_EQ(rtp_header_.frame_id, frame_events.begin()->frame_id);
   EXPECT_EQ(rtp_header_.rtp_timestamp, frame_events.begin()->rtp_timestamp);
   cast_environment_->Logging()->RemoveRawEventSubscriber(&event_subscriber);
 }

 TEST_F(FrameReceiverTest, ReceivesFramesSkippingWhenAppropriate) {
   CreateFrameReceiverOfAudio();

   SimpleEventSubscriber event_subscriber;
   cast_environment_->Logging()->AddRawEventSubscriber(&event_subscriber);

   EXPECT_CALL(mock_transport_, SendRtcpPacket(_, _))
       .WillRepeatedly(testing::Return(true));

   const uint32 rtp_advance_per_frame =
       config_.frequency / config_.max_frame_rate;
   const base::TimeDelta time_advance_per_frame =
       base::TimeDelta::FromSeconds(1) / config_.max_frame_rate;

   // Feed and process lip sync in receiver.
   FeedLipSyncInfoIntoReceiver();
   task_runner_->RunTasks();
   const base::TimeTicks first_frame_capture_time = testing_clock_->NowTicks();

   // Enqueue a request for a frame.
   const ReceiveEncodedFrameCallback frame_encoded_callback =
       base::Bind(&FakeFrameClient::DeliverEncodedFrame,
                  base::Unretained(&frame_client_));
   receiver_->RequestEncodedFrame(frame_encoded_callback);
   task_runner_->RunTasks();
   EXPECT_EQ(0, frame_client_.number_times_called());

   // Receive one frame and expect to see the first request satisfied.
   const base::TimeDelta target_playout_delay =
       base::TimeDelta::FromMilliseconds(kPlayoutDelayMillis);
   frame_client_.AddExpectedResult(
       kFirstFrameId, first_frame_capture_time + target_playout_delay);
   rtp_header_.rtp_timestamp = 0;
   FeedOneFrameIntoReceiver();  // Frame 1
   task_runner_->RunTasks();
   EXPECT_EQ(1, frame_client_.number_times_called());

   // Enqueue a second request for a frame, but it should not be fulfilled yet.
   receiver_->RequestEncodedFrame(frame_encoded_callback);
   task_runner_->RunTasks();
   EXPECT_EQ(1, frame_client_.number_times_called());

   // Receive one frame out-of-order: Make sure that we are not continuous and
   // that the RTP timestamp represents a time in the future.
   rtp_header_.frame_id = kFirstFrameId + 2;  // "Frame 3"
   rtp_header_.reference_frame_id = rtp_header_.frame_id;
   rtp_header_.rtp_timestamp += 2 * rtp_advance_per_frame;
   frame_client_.AddExpectedResult(
       kFirstFrameId + 2,
       first_frame_capture_time + 2 * time_advance_per_frame +
           target_playout_delay);
   FeedOneFrameIntoReceiver();  // Frame 3

   // Frame 2 should not come out at this point in time.
   task_runner_->RunTasks();
   EXPECT_EQ(1, frame_client_.number_times_called());

   // Enqueue a third request for a frame.
   receiver_->RequestEncodedFrame(frame_encoded_callback);
   task_runner_->RunTasks();
   EXPECT_EQ(1, frame_client_.number_times_called());

   // Now, advance time forward such that the receiver is convinced it should
   // skip Frame 2.  Frame 3 is emitted (to satisfy the second request) because a
   // decision was made to skip over the no-show Frame 2.
   testing_clock_->Advance(2 * time_advance_per_frame + target_playout_delay);
   task_runner_->RunTasks();
   EXPECT_EQ(2, frame_client_.number_times_called());

   // Receive Frame 4 and expect it to fulfill the third request immediately.
   rtp_header_.frame_id = kFirstFrameId + 3;  // "Frame 4"
   rtp_header_.reference_frame_id = rtp_header_.frame_id;
   rtp_header_.rtp_timestamp += rtp_advance_per_frame;
   frame_client_.AddExpectedResult(
       kFirstFrameId + 3, first_frame_capture_time + 3 * time_advance_per_frame +
           target_playout_delay);
   FeedOneFrameIntoReceiver();    // Frame 4
   task_runner_->RunTasks();
   EXPECT_EQ(3, frame_client_.number_times_called());

   // Move forward to the playout time of an unreceived Frame 5.  Expect no
   // additional frames were emitted.
   testing_clock_->Advance(3 * time_advance_per_frame);
   task_runner_->RunTasks();
   EXPECT_EQ(3, frame_client_.number_times_called());

   // Were only non-skipped frames logged?
   std::vector<FrameEvent> frame_events;
   event_subscriber.GetFrameEventsAndReset(&frame_events);
   ASSERT_TRUE(!frame_events.empty());
   for (size_t i = 0; i < frame_events.size(); ++i) {
     EXPECT_EQ(FRAME_ACK_SENT, frame_events[i].type);
     EXPECT_EQ(AUDIO_EVENT, frame_events[i].media_type);
     EXPECT_LE(kFirstFrameId, frame_events[i].frame_id);
     EXPECT_GE(kFirstFrameId + 4, frame_events[i].frame_id);
     const int frame_offset = frame_events[i].frame_id - kFirstFrameId;
     EXPECT_NE(frame_offset, 1);  // Frame 2 never received.
     EXPECT_EQ(frame_offset * rtp_advance_per_frame,
               frame_events[i].rtp_timestamp);
   }
   cast_environment_->Logging()->RemoveRawEventSubscriber(&event_subscriber);
 }

 TEST_F(FrameReceiverTest, ReceivesFramesRefusingToSkipAny) {
   CreateFrameReceiverOfVideo();

   SimpleEventSubscriber event_subscriber;
   cast_environment_->Logging()->AddRawEventSubscriber(&event_subscriber);

   EXPECT_CALL(mock_transport_, SendRtcpPacket(_, _))
       .WillRepeatedly(testing::Return(true));

   const uint32 rtp_advance_per_frame =
       config_.frequency / config_.max_frame_rate;
   const base::TimeDelta time_advance_per_frame =
       base::TimeDelta::FromSeconds(1) / config_.max_frame_rate;

   // Feed and process lip sync in receiver.
   FeedLipSyncInfoIntoReceiver();
   task_runner_->RunTasks();
   const base::TimeTicks first_frame_capture_time = testing_clock_->NowTicks();

   // Enqueue a request for a frame.
   const ReceiveEncodedFrameCallback frame_encoded_callback =
       base::Bind(&FakeFrameClient::DeliverEncodedFrame,
                  base::Unretained(&frame_client_));
   receiver_->RequestEncodedFrame(frame_encoded_callback);
   task_runner_->RunTasks();
   EXPECT_EQ(0, frame_client_.number_times_called());

   // Receive one frame and expect to see the first request satisfied.
   const base::TimeDelta target_playout_delay =
       base::TimeDelta::FromMilliseconds(kPlayoutDelayMillis);
   frame_client_.AddExpectedResult(
       kFirstFrameId, first_frame_capture_time + target_playout_delay);
   rtp_header_.rtp_timestamp = 0;
   FeedOneFrameIntoReceiver();  // Frame 1
   task_runner_->RunTasks();
   EXPECT_EQ(1, frame_client_.number_times_called());

   // Enqueue a second request for a frame, but it should not be fulfilled yet.
   receiver_->RequestEncodedFrame(frame_encoded_callback);
   task_runner_->RunTasks();
   EXPECT_EQ(1, frame_client_.number_times_called());

   // Receive one frame out-of-order: Make sure that we are not continuous and
   // that the RTP timestamp represents a time in the future.
   rtp_header_.is_key_frame = false;
   rtp_header_.frame_id = kFirstFrameId + 2;  // "Frame 3"
   rtp_header_.reference_frame_id = kFirstFrameId + 1;  // "Frame 2"
   rtp_header_.rtp_timestamp += 2 * rtp_advance_per_frame;
   FeedOneFrameIntoReceiver();  // Frame 3

   // Frame 2 should not come out at this point in time.
   task_runner_->RunTasks();
   EXPECT_EQ(1, frame_client_.number_times_called());

   // Enqueue a third request for a frame.
   receiver_->RequestEncodedFrame(frame_encoded_callback);
   task_runner_->RunTasks();
   EXPECT_EQ(1, frame_client_.number_times_called());

   // Now, advance time forward such that Frame 2 is now too late for playback.
   // Regardless, the receiver must NOT emit Frame 3 yet because it is not
   // allowed to skip frames when dependencies are not satisfied.  In other
   // words, Frame 3 is not decodable without Frame 2.
   testing_clock_->Advance(2 * time_advance_per_frame + target_playout_delay);
   task_runner_->RunTasks();
   EXPECT_EQ(1, frame_client_.number_times_called());

   // Now receive Frame 2 and expect both the second and third requests to be
   // fulfilled immediately.
   frame_client_.AddExpectedResult(
       kFirstFrameId + 1,  // "Frame 2"
       first_frame_capture_time + 1 * time_advance_per_frame +
           target_playout_delay);
   frame_client_.AddExpectedResult(
       kFirstFrameId + 2,  // "Frame 3"
       first_frame_capture_time + 2 * time_advance_per_frame +
           target_playout_delay);
   --rtp_header_.frame_id;  // "Frame 2"
   --rtp_header_.reference_frame_id;  // "Frame 1"
   rtp_header_.rtp_timestamp -= rtp_advance_per_frame;
   FeedOneFrameIntoReceiver();  // Frame 2
   task_runner_->RunTasks();
   EXPECT_EQ(3, frame_client_.number_times_called());

   // Move forward to the playout time of an unreceived Frame 5.  Expect no
   // additional frames were emitted.
   testing_clock_->Advance(3 * time_advance_per_frame);
   task_runner_->RunTasks();
   EXPECT_EQ(3, frame_client_.number_times_called());

   // Sanity-check logging results.
   std::vector<FrameEvent> frame_events;
   event_subscriber.GetFrameEventsAndReset(&frame_events);
   ASSERT_TRUE(!frame_events.empty());
   for (size_t i = 0; i < frame_events.size(); ++i) {
     EXPECT_EQ(FRAME_ACK_SENT, frame_events[i].type);
     EXPECT_EQ(VIDEO_EVENT, frame_events[i].media_type);
     EXPECT_LE(kFirstFrameId, frame_events[i].frame_id);
     EXPECT_GE(kFirstFrameId + 3, frame_events[i].frame_id);
     const int frame_offset = frame_events[i].frame_id - kFirstFrameId;
     EXPECT_EQ(frame_offset * rtp_advance_per_frame,
               frame_events[i].rtp_timestamp);
   }
   cast_environment_->Logging()->RemoveRawEventSubscriber(&event_subscriber);
 }

 }  // namespace cast
 }  // namespace media
	// Copyright 2014 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include <deque>
	#include <utility>

	#include "base/bind.h"
	#include "base/memory/ref_counted.h"
	#include "base/memory/scoped_ptr.h"
	#include "base/test/simple_test_tick_clock.h"
	#include "media/cast/cast_defines.h"
	#include "media/cast/cast_environment.h"
	#include "media/cast/logging/simple_event_subscriber.h"
	#include "media/cast/receiver/frame_receiver.h"
	#include "media/cast/rtcp/test_rtcp_packet_builder.h"
	#include "media/cast/test/fake_single_thread_task_runner.h"
	#include "media/cast/test/utility/default_config.h"
	#include "media/cast/transport/pacing/mock_paced_packet_sender.h"
	#include "testing/gmock/include/gmock/gmock.h"

	using ::testing::_;

	namespace media {
	namespace cast {

	namespace {

	const int kPacketSize = 1500;
	const uint32 kFirstFrameId = 1234;
	const int kPlayoutDelayMillis = 100;

	class FakeFrameClient {
	public:
	FakeFrameClient() : num_called_(0) {}
	virtual ~FakeFrameClient() {}

	void AddExpectedResult(uint32 expected_frame_id,
	const base::TimeTicks& expected_playout_time) {
	expected_results_.push_back(
	std::make_pair(expected_frame_id, expected_playout_time));
	}

	void DeliverEncodedFrame(scoped_ptr<transport::EncodedFrame> frame) {
	SCOPED_TRACE(::testing::Message() << "num_called_ is " << num_called_);
	ASSERT_FALSE(!frame)
	<< "If at shutdown: There were unsatisfied requests enqueued.";
	ASSERT_FALSE(expected_results_.empty());
	EXPECT_EQ(expected_results_.front().first, frame->frame_id);
	EXPECT_EQ(expected_results_.front().second, frame->reference_time);
	expected_results_.pop_front();
	++num_called_;
	}

	int number_times_called() const { return num_called_; }

	private:
	std::deque<std::pair<uint32, base::TimeTicks> > expected_results_;
	int num_called_;

	DISALLOW_COPY_AND_ASSIGN(FakeFrameClient);
	};
	} // namespace

	class FrameReceiverTest : public ::testing::Test {
	protected:
	FrameReceiverTest() {
	testing_clock_ = new base::SimpleTestTickClock();
	testing_clock_->Advance(base::TimeTicks::Now() - base::TimeTicks());
	start_time_ = testing_clock_->NowTicks();
	task_runner_ = new test::FakeSingleThreadTaskRunner(testing_clock_);

	cast_environment_ =
	new CastEnvironment(scoped_ptr<base::TickClock>(testing_clock_).Pass(),
	task_runner_,
	task_runner_,
	task_runner_);
	}

	virtual ~FrameReceiverTest() {}

	virtual void SetUp() {
	payload_.assign(kPacketSize, 0);

	// Always start with a key frame.
	rtp_header_.is_key_frame = true;
	rtp_header_.frame_id = kFirstFrameId;
	rtp_header_.packet_id = 0;
	rtp_header_.max_packet_id = 0;
	rtp_header_.reference_frame_id = rtp_header_.frame_id;
	rtp_header_.rtp_timestamp = 0;
	}

	void CreateFrameReceiverOfAudio() {
	config_ = GetDefaultAudioReceiverConfig();
	config_.rtp_max_delay_ms = kPlayoutDelayMillis;

	receiver_.reset(new FrameReceiver(
	cast_environment_, config_, AUDIO_EVENT, &mock_transport_));
	}

	void CreateFrameReceiverOfVideo() {
	config_ = GetDefaultVideoReceiverConfig();
	config_.rtp_max_delay_ms = kPlayoutDelayMillis;
	// Note: Frame rate must divide 1000 without remainder so the test code
	// doesn't have to account for rounding errors.
	config_.max_frame_rate = 25;

	receiver_.reset(new FrameReceiver(
	cast_environment_, config_, VIDEO_EVENT, &mock_transport_));
	}

	void FeedOneFrameIntoReceiver() {
	// Note: For testing purposes, a frame consists of only a single packet.
	receiver_->ProcessParsedPacket(
	rtp_header_, payload_.data(), payload_.size());
	}

	void FeedLipSyncInfoIntoReceiver() {
	const base::TimeTicks now = testing_clock_->NowTicks();
	const int64 rtp_timestamp = (now - start_time_) *
	config_.frequency / base::TimeDelta::FromSeconds(1);
	CHECK_LE(0, rtp_timestamp);
	uint32 ntp_seconds;
	uint32 ntp_fraction;
	ConvertTimeTicksToNtp(now, &ntp_seconds, &ntp_fraction);
	TestRtcpPacketBuilder rtcp_packet;
	rtcp_packet.AddSrWithNtp(config_.incoming_ssrc,
	ntp_seconds, ntp_fraction,
	static_cast<uint32>(rtp_timestamp));
	ASSERT_TRUE(receiver_->ProcessPacket(rtcp_packet.GetPacket().Pass()));
	}

	FrameReceiverConfig config_;
	std::vector<uint8> payload_;
	RtpCastHeader rtp_header_;
	base::SimpleTestTickClock* testing_clock_; // Owned by CastEnvironment.
	base::TimeTicks start_time_;
	transport::MockPacedPacketSender mock_transport_;
	scoped_refptr<test::FakeSingleThreadTaskRunner> task_runner_;
	scoped_refptr<CastEnvironment> cast_environment_;
	FakeFrameClient frame_client_;

	// Important for the FrameReceiver to be declared last, since its dependencies
	// must remain alive until after its destruction.
	scoped_ptr<FrameReceiver> receiver_;

	DISALLOW_COPY_AND_ASSIGN(FrameReceiverTest);
	};

	TEST_F(FrameReceiverTest, RejectsUnparsablePackets) {
	CreateFrameReceiverOfVideo();

	SimpleEventSubscriber event_subscriber;
	cast_environment_->Logging()->AddRawEventSubscriber(&event_subscriber);

	const bool success = receiver_->ProcessPacket(
	scoped_ptr<Packet>(new Packet(kPacketSize, 0xff)).Pass());
	EXPECT_FALSE(success);

	// Confirm no log events.
	std::vector<FrameEvent> frame_events;
	event_subscriber.GetFrameEventsAndReset(&frame_events);
	EXPECT_TRUE(frame_events.empty());
	cast_environment_->Logging()->RemoveRawEventSubscriber(&event_subscriber);
	}

	TEST_F(FrameReceiverTest, ReceivesOneFrame) {
	CreateFrameReceiverOfAudio();

	SimpleEventSubscriber event_subscriber;
	cast_environment_->Logging()->AddRawEventSubscriber(&event_subscriber);

	EXPECT_CALL(mock_transport_, SendRtcpPacket(_, _))
	.WillRepeatedly(testing::Return(true));

	FeedLipSyncInfoIntoReceiver();
	task_runner_->RunTasks();

	// Enqueue a request for a frame.
	receiver_->RequestEncodedFrame(
	base::Bind(&FakeFrameClient::DeliverEncodedFrame,
	base::Unretained(&frame_client_)));

	// The request should not be satisfied since no packets have been received.
	task_runner_->RunTasks();
	EXPECT_EQ(0, frame_client_.number_times_called());

	// Deliver one frame to the receiver and expect to get one frame back.
	const base::TimeDelta target_playout_delay =
	base::TimeDelta::FromMilliseconds(kPlayoutDelayMillis);
	frame_client_.AddExpectedResult(
	kFirstFrameId, testing_clock_->NowTicks() + target_playout_delay);
	FeedOneFrameIntoReceiver();
	task_runner_->RunTasks();
	EXPECT_EQ(1, frame_client_.number_times_called());

	// Was the frame logged?
	std::vector<FrameEvent> frame_events;
	event_subscriber.GetFrameEventsAndReset(&frame_events);
	ASSERT_TRUE(!frame_events.empty());
	EXPECT_EQ(FRAME_ACK_SENT, frame_events.begin()->type);
	EXPECT_EQ(AUDIO_EVENT, frame_events.begin()->media_type);
	EXPECT_EQ(rtp_header_.frame_id, frame_events.begin()->frame_id);
	EXPECT_EQ(rtp_header_.rtp_timestamp, frame_events.begin()->rtp_timestamp);
	cast_environment_->Logging()->RemoveRawEventSubscriber(&event_subscriber);
	}

	TEST_F(FrameReceiverTest, ReceivesFramesSkippingWhenAppropriate) {
	CreateFrameReceiverOfAudio();

	SimpleEventSubscriber event_subscriber;
	cast_environment_->Logging()->AddRawEventSubscriber(&event_subscriber);

	EXPECT_CALL(mock_transport_, SendRtcpPacket(_, _))
	.WillRepeatedly(testing::Return(true));

	const uint32 rtp_advance_per_frame =
	config_.frequency / config_.max_frame_rate;
	const base::TimeDelta time_advance_per_frame =
	base::TimeDelta::FromSeconds(1) / config_.max_frame_rate;

	// Feed and process lip sync in receiver.
	FeedLipSyncInfoIntoReceiver();
	task_runner_->RunTasks();
	const base::TimeTicks first_frame_capture_time = testing_clock_->NowTicks();

	// Enqueue a request for a frame.
	const ReceiveEncodedFrameCallback frame_encoded_callback =
	base::Bind(&FakeFrameClient::DeliverEncodedFrame,
	base::Unretained(&frame_client_));
	receiver_->RequestEncodedFrame(frame_encoded_callback);
	task_runner_->RunTasks();
	EXPECT_EQ(0, frame_client_.number_times_called());

	// Receive one frame and expect to see the first request satisfied.
	const base::TimeDelta target_playout_delay =
	base::TimeDelta::FromMilliseconds(kPlayoutDelayMillis);
	frame_client_.AddExpectedResult(
	kFirstFrameId, first_frame_capture_time + target_playout_delay);
	rtp_header_.rtp_timestamp = 0;
	FeedOneFrameIntoReceiver(); // Frame 1
	task_runner_->RunTasks();
	EXPECT_EQ(1, frame_client_.number_times_called());

	// Enqueue a second request for a frame, but it should not be fulfilled yet.
	receiver_->RequestEncodedFrame(frame_encoded_callback);
	task_runner_->RunTasks();
	EXPECT_EQ(1, frame_client_.number_times_called());

	// Receive one frame out-of-order: Make sure that we are not continuous and
	// that the RTP timestamp represents a time in the future.
	rtp_header_.frame_id = kFirstFrameId + 2; // "Frame 3"
	rtp_header_.reference_frame_id = rtp_header_.frame_id;
	rtp_header_.rtp_timestamp += 2 * rtp_advance_per_frame;
	frame_client_.AddExpectedResult(
	kFirstFrameId + 2,
	first_frame_capture_time + 2 * time_advance_per_frame +
	target_playout_delay);
	FeedOneFrameIntoReceiver(); // Frame 3

	// Frame 2 should not come out at this point in time.
	task_runner_->RunTasks();
	EXPECT_EQ(1, frame_client_.number_times_called());

	// Enqueue a third request for a frame.
	receiver_->RequestEncodedFrame(frame_encoded_callback);
	task_runner_->RunTasks();
	EXPECT_EQ(1, frame_client_.number_times_called());

	// Now, advance time forward such that the receiver is convinced it should
	// skip Frame 2. Frame 3 is emitted (to satisfy the second request) because a
	// decision was made to skip over the no-show Frame 2.
	testing_clock_->Advance(2 * time_advance_per_frame + target_playout_delay);
	task_runner_->RunTasks();
	EXPECT_EQ(2, frame_client_.number_times_called());

	// Receive Frame 4 and expect it to fulfill the third request immediately.
	rtp_header_.frame_id = kFirstFrameId + 3; // "Frame 4"
	rtp_header_.reference_frame_id = rtp_header_.frame_id;
	rtp_header_.rtp_timestamp += rtp_advance_per_frame;
	frame_client_.AddExpectedResult(
	kFirstFrameId + 3, first_frame_capture_time + 3 * time_advance_per_frame +
	target_playout_delay);
	FeedOneFrameIntoReceiver(); // Frame 4
	task_runner_->RunTasks();
	EXPECT_EQ(3, frame_client_.number_times_called());

	// Move forward to the playout time of an unreceived Frame 5. Expect no
	// additional frames were emitted.
	testing_clock_->Advance(3 * time_advance_per_frame);
	task_runner_->RunTasks();
	EXPECT_EQ(3, frame_client_.number_times_called());

	// Were only non-skipped frames logged?
	std::vector<FrameEvent> frame_events;
	event_subscriber.GetFrameEventsAndReset(&frame_events);
	ASSERT_TRUE(!frame_events.empty());
	for (size_t i = 0; i < frame_events.size(); ++i) {
	EXPECT_EQ(FRAME_ACK_SENT, frame_events[i].type);
	EXPECT_EQ(AUDIO_EVENT, frame_events[i].media_type);
	EXPECT_LE(kFirstFrameId, frame_events[i].frame_id);
	EXPECT_GE(kFirstFrameId + 4, frame_events[i].frame_id);
	const int frame_offset = frame_events[i].frame_id - kFirstFrameId;
	EXPECT_NE(frame_offset, 1); // Frame 2 never received.
	EXPECT_EQ(frame_offset * rtp_advance_per_frame,
	frame_events[i].rtp_timestamp);
	}
	cast_environment_->Logging()->RemoveRawEventSubscriber(&event_subscriber);
	}

	TEST_F(FrameReceiverTest, ReceivesFramesRefusingToSkipAny) {
	CreateFrameReceiverOfVideo();

	SimpleEventSubscriber event_subscriber;
	cast_environment_->Logging()->AddRawEventSubscriber(&event_subscriber);

	EXPECT_CALL(mock_transport_, SendRtcpPacket(_, _))
	.WillRepeatedly(testing::Return(true));

	const uint32 rtp_advance_per_frame =
	config_.frequency / config_.max_frame_rate;
	const base::TimeDelta time_advance_per_frame =
	base::TimeDelta::FromSeconds(1) / config_.max_frame_rate;

	// Feed and process lip sync in receiver.
	FeedLipSyncInfoIntoReceiver();
	task_runner_->RunTasks();
	const base::TimeTicks first_frame_capture_time = testing_clock_->NowTicks();

	// Enqueue a request for a frame.
	const ReceiveEncodedFrameCallback frame_encoded_callback =
	base::Bind(&FakeFrameClient::DeliverEncodedFrame,
	base::Unretained(&frame_client_));
	receiver_->RequestEncodedFrame(frame_encoded_callback);
	task_runner_->RunTasks();
	EXPECT_EQ(0, frame_client_.number_times_called());

	// Receive one frame and expect to see the first request satisfied.
	const base::TimeDelta target_playout_delay =
	base::TimeDelta::FromMilliseconds(kPlayoutDelayMillis);
	frame_client_.AddExpectedResult(
	kFirstFrameId, first_frame_capture_time + target_playout_delay);
	rtp_header_.rtp_timestamp = 0;
	FeedOneFrameIntoReceiver(); // Frame 1
	task_runner_->RunTasks();
	EXPECT_EQ(1, frame_client_.number_times_called());

	// Enqueue a second request for a frame, but it should not be fulfilled yet.
	receiver_->RequestEncodedFrame(frame_encoded_callback);
	task_runner_->RunTasks();
	EXPECT_EQ(1, frame_client_.number_times_called());

	// Receive one frame out-of-order: Make sure that we are not continuous and
	// that the RTP timestamp represents a time in the future.
	rtp_header_.is_key_frame = false;
	rtp_header_.frame_id = kFirstFrameId + 2; // "Frame 3"
	rtp_header_.reference_frame_id = kFirstFrameId + 1; // "Frame 2"
	rtp_header_.rtp_timestamp += 2 * rtp_advance_per_frame;
	FeedOneFrameIntoReceiver(); // Frame 3

	// Frame 2 should not come out at this point in time.
	task_runner_->RunTasks();
	EXPECT_EQ(1, frame_client_.number_times_called());

	// Enqueue a third request for a frame.
	receiver_->RequestEncodedFrame(frame_encoded_callback);
	task_runner_->RunTasks();
	EXPECT_EQ(1, frame_client_.number_times_called());

	// Now, advance time forward such that Frame 2 is now too late for playback.
	// Regardless, the receiver must NOT emit Frame 3 yet because it is not
	// allowed to skip frames when dependencies are not satisfied. In other
	// words, Frame 3 is not decodable without Frame 2.
	testing_clock_->Advance(2 * time_advance_per_frame + target_playout_delay);
	task_runner_->RunTasks();
	EXPECT_EQ(1, frame_client_.number_times_called());

	// Now receive Frame 2 and expect both the second and third requests to be
	// fulfilled immediately.
	frame_client_.AddExpectedResult(
	kFirstFrameId + 1, // "Frame 2"
	first_frame_capture_time + 1 * time_advance_per_frame +
	target_playout_delay);
	frame_client_.AddExpectedResult(
	kFirstFrameId + 2, // "Frame 3"
	first_frame_capture_time + 2 * time_advance_per_frame +
	target_playout_delay);
	--rtp_header_.frame_id; // "Frame 2"
	--rtp_header_.reference_frame_id; // "Frame 1"
	rtp_header_.rtp_timestamp -= rtp_advance_per_frame;
	FeedOneFrameIntoReceiver(); // Frame 2
	task_runner_->RunTasks();
	EXPECT_EQ(3, frame_client_.number_times_called());

	// Move forward to the playout time of an unreceived Frame 5. Expect no
	// additional frames were emitted.
	testing_clock_->Advance(3 * time_advance_per_frame);
	task_runner_->RunTasks();
	EXPECT_EQ(3, frame_client_.number_times_called());

	// Sanity-check logging results.
	std::vector<FrameEvent> frame_events;
	event_subscriber.GetFrameEventsAndReset(&frame_events);
	ASSERT_TRUE(!frame_events.empty());
	for (size_t i = 0; i < frame_events.size(); ++i) {
	EXPECT_EQ(FRAME_ACK_SENT, frame_events[i].type);
	EXPECT_EQ(VIDEO_EVENT, frame_events[i].media_type);
	EXPECT_LE(kFirstFrameId, frame_events[i].frame_id);
	EXPECT_GE(kFirstFrameId + 3, frame_events[i].frame_id);
	const int frame_offset = frame_events[i].frame_id - kFirstFrameId;
	EXPECT_EQ(frame_offset * rtp_advance_per_frame,
	frame_events[i].rtp_timestamp);
	}
	cast_environment_->Logging()->RemoveRawEventSubscriber(&event_subscriber);
	}

	} // namespace cast
	} // namespace media