modules/rtp_rtcp/test/testAPI/test_api_audio.cc - src - Git at Google

 /*
  *  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 <algorithm>
 #include <memory>
 #include <vector>

 #include "common_types.h"  // NOLINT(build/include)
 #include "modules/audio_coding/codecs/audio_format_conversion.h"
 #include "modules/rtp_rtcp/include/rtp_rtcp.h"
 #include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 #include "modules/rtp_rtcp/source/rtp_receiver_audio.h"
 #include "modules/rtp_rtcp/test/testAPI/test_api.h"
 #include "rtc_base/rate_limiter.h"
 #include "test/gtest.h"

 namespace webrtc {
 namespace {

 const uint32_t kTestRate = 64000u;
 const uint8_t kTestPayload[] = { 't', 'e', 's', 't' };
 const uint8_t kPcmuPayloadType = 96;
 const uint8_t kDtmfPayloadType = 97;

 struct CngCodecSpec {
   int payload_type;
   int clockrate_hz;
 };

 const CngCodecSpec kCngCodecs[] = {{13, 8000},
                                    {103, 16000},
                                    {104, 32000},
                                    {105, 48000}};

 bool IsComfortNoisePayload(uint8_t payload_type) {
   for (const auto& c : kCngCodecs) {
     if (c.payload_type == payload_type)
       return true;
   }

   return false;
 }

 class VerifyingAudioReceiver : public RtpData {
  public:
   int32_t OnReceivedPayloadData(
       const uint8_t* payloadData,
       size_t payloadSize,
       const webrtc::WebRtcRTPHeader* rtpHeader) override {
     const uint8_t payload_type = rtpHeader->header.payloadType;
     if (payload_type == kPcmuPayloadType || payload_type == kDtmfPayloadType) {
       EXPECT_EQ(sizeof(kTestPayload), payloadSize);
       // All our test vectors for PCMU and DTMF are equal to |kTestPayload|.
       const size_t min_size = std::min(sizeof(kTestPayload), payloadSize);
       EXPECT_EQ(0, memcmp(payloadData, kTestPayload, min_size));
     } else if (IsComfortNoisePayload(payload_type)) {
       // CNG types should be recognized properly.
       EXPECT_EQ(kAudioFrameCN, rtpHeader->frameType);
       EXPECT_TRUE(rtpHeader->type.Audio.isCNG);
     }
     return 0;
   }
 };

 class RTPCallback : public NullRtpFeedback {
  public:
   int32_t OnInitializeDecoder(int payload_type,
                               const SdpAudioFormat& audio_format,
                               uint32_t rate) override {
     EXPECT_EQ(0u, rate) << "The rate should be zero";
     return 0;
   }
 };

 }  // namespace

 class RtpRtcpAudioTest : public ::testing::Test {
  protected:
   RtpRtcpAudioTest()
       : fake_clock(123456), retransmission_rate_limiter_(&fake_clock, 1000) {
     test_CSRC[0] = 1234;
     test_CSRC[2] = 2345;
     test_ssrc = 3456;
     test_timestamp = 4567;
     test_sequence_number = 2345;
   }
   ~RtpRtcpAudioTest() {}

   void SetUp() override {
     receive_statistics1_.reset(ReceiveStatistics::Create(&fake_clock));
     receive_statistics2_.reset(ReceiveStatistics::Create(&fake_clock));

     rtp_payload_registry1_.reset(new RTPPayloadRegistry());
     rtp_payload_registry2_.reset(new RTPPayloadRegistry());

     RtpRtcp::Configuration configuration;
     configuration.audio = true;
     configuration.clock = &fake_clock;
     configuration.receive_statistics = receive_statistics1_.get();
     configuration.outgoing_transport = &transport1;
     configuration.retransmission_rate_limiter = &retransmission_rate_limiter_;

     module1.reset(RtpRtcp::CreateRtpRtcp(configuration));
     rtp_receiver1_.reset(RtpReceiver::CreateAudioReceiver(
         &fake_clock, &data_receiver1, &rtp_callback,
         rtp_payload_registry1_.get()));

     configuration.receive_statistics = receive_statistics2_.get();
     configuration.outgoing_transport = &transport2;

     module2.reset(RtpRtcp::CreateRtpRtcp(configuration));
     rtp_receiver2_.reset(RtpReceiver::CreateAudioReceiver(
         &fake_clock, &data_receiver2, &rtp_callback,
         rtp_payload_registry2_.get()));

     transport1.SetSendModule(module2.get(), rtp_payload_registry2_.get(),
                              rtp_receiver2_.get(), receive_statistics2_.get());
     transport2.SetSendModule(module1.get(), rtp_payload_registry1_.get(),
                              rtp_receiver1_.get(), receive_statistics1_.get());
   }

   void RegisterPayload(const CodecInst& codec) {
     EXPECT_EQ(0, module1->RegisterSendPayload(codec));
     EXPECT_EQ(0, rtp_receiver1_->RegisterReceivePayload(codec.pltype,
                                                         CodecInstToSdp(codec)));
     EXPECT_EQ(0, module2->RegisterSendPayload(codec));
     EXPECT_EQ(0, rtp_receiver2_->RegisterReceivePayload(codec.pltype,
                                                         CodecInstToSdp(codec)));
   }

   VerifyingAudioReceiver data_receiver1;
   VerifyingAudioReceiver data_receiver2;
   RTPCallback rtp_callback;
   std::unique_ptr<ReceiveStatistics> receive_statistics1_;
   std::unique_ptr<ReceiveStatistics> receive_statistics2_;
   std::unique_ptr<RTPPayloadRegistry> rtp_payload_registry1_;
   std::unique_ptr<RTPPayloadRegistry> rtp_payload_registry2_;
   std::unique_ptr<RtpReceiver> rtp_receiver1_;
   std::unique_ptr<RtpReceiver> rtp_receiver2_;
   std::unique_ptr<RtpRtcp> module1;
   std::unique_ptr<RtpRtcp> module2;
   LoopBackTransport transport1;
   LoopBackTransport transport2;
   uint32_t test_ssrc;
   uint32_t test_timestamp;
   uint16_t test_sequence_number;
   uint32_t test_CSRC[webrtc::kRtpCsrcSize];
   SimulatedClock fake_clock;
   RateLimiter retransmission_rate_limiter_;
 };

 TEST_F(RtpRtcpAudioTest, Basic) {
   module1->SetSSRC(test_ssrc);
   module1->SetStartTimestamp(test_timestamp);

   // Test detection at the end of a DTMF tone.
   // EXPECT_EQ(0, module2->SetTelephoneEventForwardToDecoder(true));

   EXPECT_EQ(0, module1->SetSendingStatus(true));

   // Start basic RTP test.

   // Send an empty RTP packet.
   // Should fail since we have not registered the payload type.
   EXPECT_FALSE(module1->SendOutgoingData(webrtc::kAudioFrameSpeech,
                                          kPcmuPayloadType, 0, -1, nullptr, 0,
                                          nullptr, nullptr, nullptr));

   CodecInst voice_codec = {};
   voice_codec.pltype = kPcmuPayloadType;
   voice_codec.plfreq = 8000;
   voice_codec.rate = kTestRate;
   memcpy(voice_codec.plname, "PCMU", 5);
   RegisterPayload(voice_codec);

   EXPECT_TRUE(module1->SendOutgoingData(webrtc::kAudioFrameSpeech,
                                         kPcmuPayloadType, 0, -1, kTestPayload,
                                         4, nullptr, nullptr, nullptr));

   EXPECT_EQ(test_ssrc, rtp_receiver2_->SSRC());
   uint32_t timestamp;
   int64_t receive_time_ms;
   EXPECT_TRUE(
       rtp_receiver2_->GetLatestTimestamps(&timestamp, &receive_time_ms));
   EXPECT_EQ(test_timestamp, timestamp);
   EXPECT_EQ(fake_clock.TimeInMilliseconds(), receive_time_ms);
 }

 TEST_F(RtpRtcpAudioTest, DTMF) {
   CodecInst voice_codec = {};
   voice_codec.pltype = kPcmuPayloadType;
   voice_codec.plfreq = 8000;
   voice_codec.rate = kTestRate;
   memcpy(voice_codec.plname, "PCMU", 5);
   RegisterPayload(voice_codec);

   module1->SetSSRC(test_ssrc);
   module1->SetStartTimestamp(test_timestamp);
   EXPECT_EQ(0, module1->SetSendingStatus(true));

   // Prepare for DTMF.
   voice_codec.pltype = kDtmfPayloadType;
   voice_codec.plfreq = 8000;
   memcpy(voice_codec.plname, "telephone-event", 16);

   EXPECT_EQ(0, module1->RegisterSendPayload(voice_codec));
   EXPECT_EQ(0, rtp_receiver2_->RegisterReceivePayload(
                    voice_codec.pltype, CodecInstToSdp(voice_codec)));

   // Start DTMF test.
   int timeStamp = 160;

   // Send a DTMF tone using RFC 2833 (4733).
   for (int i = 0; i < 16; i++) {
     EXPECT_EQ(0, module1->SendTelephoneEventOutband(i, timeStamp, 10));
   }
   timeStamp += 160;  // Prepare for next packet.

   // Send RTP packets for 16 tones a 160 ms  100ms
   // pause between = 2560ms + 1600ms = 4160ms
   for (; timeStamp <= 250 * 160; timeStamp += 160) {
     EXPECT_TRUE(module1->SendOutgoingData(
         webrtc::kAudioFrameSpeech, kPcmuPayloadType, timeStamp, -1,
         kTestPayload, 4, nullptr, nullptr, nullptr));
     fake_clock.AdvanceTimeMilliseconds(20);
     module1->Process();
   }
   EXPECT_EQ(0, module1->SendTelephoneEventOutband(32, 9000, 10));

   for (; timeStamp <= 740 * 160; timeStamp += 160) {
     EXPECT_TRUE(module1->SendOutgoingData(
         webrtc::kAudioFrameSpeech, kPcmuPayloadType, timeStamp, -1,
         kTestPayload, 4, nullptr, nullptr, nullptr));
     fake_clock.AdvanceTimeMilliseconds(20);
     module1->Process();
   }
 }

 TEST_F(RtpRtcpAudioTest, ComfortNoise) {
   module1->SetSSRC(test_ssrc);
   module1->SetStartTimestamp(test_timestamp);

   EXPECT_EQ(0, module1->SetSendingStatus(true));

   // Register PCMU and all four comfort noise codecs
   CodecInst voice_codec = {};
   voice_codec.pltype = kPcmuPayloadType;
   voice_codec.plfreq = 8000;
   voice_codec.rate = kTestRate;
   memcpy(voice_codec.plname, "PCMU", 5);
   RegisterPayload(voice_codec);

   for (const auto& c : kCngCodecs) {
     CodecInst cng_codec = {};
     cng_codec.pltype = c.payload_type;
     cng_codec.plfreq = c.clockrate_hz;
     memcpy(cng_codec.plname, "CN", 3);
     RegisterPayload(cng_codec);
   }

   // Transmit comfort noise packets interleaved by PCMU packets.
   uint32_t in_timestamp = 0;
   for (const auto& c : kCngCodecs) {
     uint32_t timestamp;
     int64_t receive_time_ms;
     EXPECT_TRUE(module1->SendOutgoingData(
         webrtc::kAudioFrameSpeech, kPcmuPayloadType, in_timestamp, -1,
         kTestPayload, 4, nullptr, nullptr, nullptr));

     EXPECT_EQ(test_ssrc, rtp_receiver2_->SSRC());
     EXPECT_TRUE(
         rtp_receiver2_->GetLatestTimestamps(&timestamp, &receive_time_ms));
     EXPECT_EQ(test_timestamp + in_timestamp, timestamp);
     EXPECT_EQ(fake_clock.TimeInMilliseconds(), receive_time_ms);
     in_timestamp += 10;
     fake_clock.AdvanceTimeMilliseconds(20);

     EXPECT_TRUE(module1->SendOutgoingData(webrtc::kAudioFrameCN, c.payload_type,
                                           in_timestamp, -1, kTestPayload, 1,
                                           nullptr, nullptr, nullptr));

     EXPECT_EQ(test_ssrc, rtp_receiver2_->SSRC());
     EXPECT_TRUE(
         rtp_receiver2_->GetLatestTimestamps(&timestamp, &receive_time_ms));
     EXPECT_EQ(test_timestamp + in_timestamp, timestamp);
     EXPECT_EQ(fake_clock.TimeInMilliseconds(), receive_time_ms);
     in_timestamp += 10;
     fake_clock.AdvanceTimeMilliseconds(20);
   }
 }

 }  // namespace webrtc
	/*
	* 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 <algorithm>
	#include <memory>
	#include <vector>

	#include "common_types.h" // NOLINT(build/include)
	#include "modules/audio_coding/codecs/audio_format_conversion.h"
	#include "modules/rtp_rtcp/include/rtp_rtcp.h"
	#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
	#include "modules/rtp_rtcp/source/rtp_receiver_audio.h"
	#include "modules/rtp_rtcp/test/testAPI/test_api.h"
	#include "rtc_base/rate_limiter.h"
	#include "test/gtest.h"

	namespace webrtc {
	namespace {

	const uint32_t kTestRate = 64000u;
	const uint8_t kTestPayload[] = { 't', 'e', 's', 't' };
	const uint8_t kPcmuPayloadType = 96;
	const uint8_t kDtmfPayloadType = 97;

	struct CngCodecSpec {
	int payload_type;
	int clockrate_hz;
	};

	const CngCodecSpec kCngCodecs[] = {{13, 8000},
	{103, 16000},
	{104, 32000},
	{105, 48000}};

	bool IsComfortNoisePayload(uint8_t payload_type) {
	for (const auto& c : kCngCodecs) {
	if (c.payload_type == payload_type)
	return true;
	}

	return false;
	}

	class VerifyingAudioReceiver : public RtpData {
	public:
	int32_t OnReceivedPayloadData(
	const uint8_t* payloadData,
	size_t payloadSize,
	const webrtc::WebRtcRTPHeader* rtpHeader) override {
	const uint8_t payload_type = rtpHeader->header.payloadType;
	if (payload_type == kPcmuPayloadType \|\| payload_type == kDtmfPayloadType) {
	EXPECT_EQ(sizeof(kTestPayload), payloadSize);
	// All our test vectors for PCMU and DTMF are equal to \|kTestPayload\|.
	const size_t min_size = std::min(sizeof(kTestPayload), payloadSize);
	EXPECT_EQ(0, memcmp(payloadData, kTestPayload, min_size));
	} else if (IsComfortNoisePayload(payload_type)) {
	// CNG types should be recognized properly.
	EXPECT_EQ(kAudioFrameCN, rtpHeader->frameType);
	EXPECT_TRUE(rtpHeader->type.Audio.isCNG);
	}
	return 0;
	}
	};

	class RTPCallback : public NullRtpFeedback {
	public:
	int32_t OnInitializeDecoder(int payload_type,
	const SdpAudioFormat& audio_format,
	uint32_t rate) override {
	EXPECT_EQ(0u, rate) << "The rate should be zero";
	return 0;
	}
	};

	} // namespace

	class RtpRtcpAudioTest : public ::testing::Test {
	protected:
	RtpRtcpAudioTest()
	: fake_clock(123456), retransmission_rate_limiter_(&fake_clock, 1000) {
	test_CSRC[0] = 1234;
	test_CSRC[2] = 2345;
	test_ssrc = 3456;
	test_timestamp = 4567;
	test_sequence_number = 2345;
	}
	~RtpRtcpAudioTest() {}

	void SetUp() override {
	receive_statistics1_.reset(ReceiveStatistics::Create(&fake_clock));
	receive_statistics2_.reset(ReceiveStatistics::Create(&fake_clock));

	rtp_payload_registry1_.reset(new RTPPayloadRegistry());
	rtp_payload_registry2_.reset(new RTPPayloadRegistry());

	RtpRtcp::Configuration configuration;
	configuration.audio = true;
	configuration.clock = &fake_clock;
	configuration.receive_statistics = receive_statistics1_.get();
	configuration.outgoing_transport = &transport1;
	configuration.retransmission_rate_limiter = &retransmission_rate_limiter_;

	module1.reset(RtpRtcp::CreateRtpRtcp(configuration));
	rtp_receiver1_.reset(RtpReceiver::CreateAudioReceiver(
	&fake_clock, &data_receiver1, &rtp_callback,
	rtp_payload_registry1_.get()));

	configuration.receive_statistics = receive_statistics2_.get();
	configuration.outgoing_transport = &transport2;

	module2.reset(RtpRtcp::CreateRtpRtcp(configuration));
	rtp_receiver2_.reset(RtpReceiver::CreateAudioReceiver(
	&fake_clock, &data_receiver2, &rtp_callback,
	rtp_payload_registry2_.get()));

	transport1.SetSendModule(module2.get(), rtp_payload_registry2_.get(),
	rtp_receiver2_.get(), receive_statistics2_.get());
	transport2.SetSendModule(module1.get(), rtp_payload_registry1_.get(),
	rtp_receiver1_.get(), receive_statistics1_.get());
	}

	void RegisterPayload(const CodecInst& codec) {
	EXPECT_EQ(0, module1->RegisterSendPayload(codec));
	EXPECT_EQ(0, rtp_receiver1_->RegisterReceivePayload(codec.pltype,
	CodecInstToSdp(codec)));
	EXPECT_EQ(0, module2->RegisterSendPayload(codec));
	EXPECT_EQ(0, rtp_receiver2_->RegisterReceivePayload(codec.pltype,
	CodecInstToSdp(codec)));
	}

	VerifyingAudioReceiver data_receiver1;
	VerifyingAudioReceiver data_receiver2;
	RTPCallback rtp_callback;
	std::unique_ptr<ReceiveStatistics> receive_statistics1_;
	std::unique_ptr<ReceiveStatistics> receive_statistics2_;
	std::unique_ptr<RTPPayloadRegistry> rtp_payload_registry1_;
	std::unique_ptr<RTPPayloadRegistry> rtp_payload_registry2_;
	std::unique_ptr<RtpReceiver> rtp_receiver1_;
	std::unique_ptr<RtpReceiver> rtp_receiver2_;
	std::unique_ptr<RtpRtcp> module1;
	std::unique_ptr<RtpRtcp> module2;
	LoopBackTransport transport1;
	LoopBackTransport transport2;
	uint32_t test_ssrc;
	uint32_t test_timestamp;
	uint16_t test_sequence_number;
	uint32_t test_CSRC[webrtc::kRtpCsrcSize];
	SimulatedClock fake_clock;
	RateLimiter retransmission_rate_limiter_;
	};

	TEST_F(RtpRtcpAudioTest, Basic) {
	module1->SetSSRC(test_ssrc);
	module1->SetStartTimestamp(test_timestamp);

	// Test detection at the end of a DTMF tone.
	// EXPECT_EQ(0, module2->SetTelephoneEventForwardToDecoder(true));

	EXPECT_EQ(0, module1->SetSendingStatus(true));

	// Start basic RTP test.

	// Send an empty RTP packet.
	// Should fail since we have not registered the payload type.
	EXPECT_FALSE(module1->SendOutgoingData(webrtc::kAudioFrameSpeech,
	kPcmuPayloadType, 0, -1, nullptr, 0,
	nullptr, nullptr, nullptr));

	CodecInst voice_codec = {};
	voice_codec.pltype = kPcmuPayloadType;
	voice_codec.plfreq = 8000;
	voice_codec.rate = kTestRate;
	memcpy(voice_codec.plname, "PCMU", 5);
	RegisterPayload(voice_codec);

	EXPECT_TRUE(module1->SendOutgoingData(webrtc::kAudioFrameSpeech,
	kPcmuPayloadType, 0, -1, kTestPayload,
	4, nullptr, nullptr, nullptr));

	EXPECT_EQ(test_ssrc, rtp_receiver2_->SSRC());
	uint32_t timestamp;
	int64_t receive_time_ms;
	EXPECT_TRUE(
	rtp_receiver2_->GetLatestTimestamps(&timestamp, &receive_time_ms));
	EXPECT_EQ(test_timestamp, timestamp);
	EXPECT_EQ(fake_clock.TimeInMilliseconds(), receive_time_ms);
	}

	TEST_F(RtpRtcpAudioTest, DTMF) {
	CodecInst voice_codec = {};
	voice_codec.pltype = kPcmuPayloadType;
	voice_codec.plfreq = 8000;
	voice_codec.rate = kTestRate;
	memcpy(voice_codec.plname, "PCMU", 5);
	RegisterPayload(voice_codec);

	module1->SetSSRC(test_ssrc);
	module1->SetStartTimestamp(test_timestamp);
	EXPECT_EQ(0, module1->SetSendingStatus(true));

	// Prepare for DTMF.
	voice_codec.pltype = kDtmfPayloadType;
	voice_codec.plfreq = 8000;
	memcpy(voice_codec.plname, "telephone-event", 16);

	EXPECT_EQ(0, module1->RegisterSendPayload(voice_codec));
	EXPECT_EQ(0, rtp_receiver2_->RegisterReceivePayload(
	voice_codec.pltype, CodecInstToSdp(voice_codec)));

	// Start DTMF test.
	int timeStamp = 160;

	// Send a DTMF tone using RFC 2833 (4733).
	for (int i = 0; i < 16; i++) {
	EXPECT_EQ(0, module1->SendTelephoneEventOutband(i, timeStamp, 10));
	}
	timeStamp += 160; // Prepare for next packet.

	// Send RTP packets for 16 tones a 160 ms 100ms
	// pause between = 2560ms + 1600ms = 4160ms
	for (; timeStamp <= 250 * 160; timeStamp += 160) {
	EXPECT_TRUE(module1->SendOutgoingData(
	webrtc::kAudioFrameSpeech, kPcmuPayloadType, timeStamp, -1,
	kTestPayload, 4, nullptr, nullptr, nullptr));
	fake_clock.AdvanceTimeMilliseconds(20);
	module1->Process();
	}
	EXPECT_EQ(0, module1->SendTelephoneEventOutband(32, 9000, 10));

	for (; timeStamp <= 740 * 160; timeStamp += 160) {
	EXPECT_TRUE(module1->SendOutgoingData(
	webrtc::kAudioFrameSpeech, kPcmuPayloadType, timeStamp, -1,
	kTestPayload, 4, nullptr, nullptr, nullptr));
	fake_clock.AdvanceTimeMilliseconds(20);
	module1->Process();
	}
	}

	TEST_F(RtpRtcpAudioTest, ComfortNoise) {
	module1->SetSSRC(test_ssrc);
	module1->SetStartTimestamp(test_timestamp);

	EXPECT_EQ(0, module1->SetSendingStatus(true));

	// Register PCMU and all four comfort noise codecs
	CodecInst voice_codec = {};
	voice_codec.pltype = kPcmuPayloadType;
	voice_codec.plfreq = 8000;
	voice_codec.rate = kTestRate;
	memcpy(voice_codec.plname, "PCMU", 5);
	RegisterPayload(voice_codec);

	for (const auto& c : kCngCodecs) {
	CodecInst cng_codec = {};
	cng_codec.pltype = c.payload_type;
	cng_codec.plfreq = c.clockrate_hz;
	memcpy(cng_codec.plname, "CN", 3);
	RegisterPayload(cng_codec);
	}

	// Transmit comfort noise packets interleaved by PCMU packets.
	uint32_t in_timestamp = 0;
	for (const auto& c : kCngCodecs) {
	uint32_t timestamp;
	int64_t receive_time_ms;
	EXPECT_TRUE(module1->SendOutgoingData(
	webrtc::kAudioFrameSpeech, kPcmuPayloadType, in_timestamp, -1,
	kTestPayload, 4, nullptr, nullptr, nullptr));

	EXPECT_EQ(test_ssrc, rtp_receiver2_->SSRC());
	EXPECT_TRUE(
	rtp_receiver2_->GetLatestTimestamps(&timestamp, &receive_time_ms));
	EXPECT_EQ(test_timestamp + in_timestamp, timestamp);
	EXPECT_EQ(fake_clock.TimeInMilliseconds(), receive_time_ms);
	in_timestamp += 10;
	fake_clock.AdvanceTimeMilliseconds(20);

	EXPECT_TRUE(module1->SendOutgoingData(webrtc::kAudioFrameCN, c.payload_type,
	in_timestamp, -1, kTestPayload, 1,
	nullptr, nullptr, nullptr));

	EXPECT_EQ(test_ssrc, rtp_receiver2_->SSRC());
	EXPECT_TRUE(
	rtp_receiver2_->GetLatestTimestamps(&timestamp, &receive_time_ms));
	EXPECT_EQ(test_timestamp + in_timestamp, timestamp);
	EXPECT_EQ(fake_clock.TimeInMilliseconds(), receive_time_ms);
	in_timestamp += 10;
	fake_clock.AdvanceTimeMilliseconds(20);
	}
	}

	} // namespace webrtc