modules/audio_coding/test/TwoWayCommunication.cc - src/webrtc - 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 "TwoWayCommunication.h"

 #include <ctype.h>
 #include <stdio.h>
 #include <string.h>

 #include <memory>

 #ifdef WIN32
 #include <Windows.h>
 #endif

 #include "webrtc/api/audio_codecs/builtin_audio_decoder_factory.h"
 #include "webrtc/common_types.h"
 #include "webrtc/modules/audio_coding/codecs/audio_format_conversion.h"
 #include "webrtc/modules/audio_coding/test/PCMFile.h"
 #include "webrtc/modules/audio_coding/test/utility.h"
 #include "webrtc/system_wrappers/include/trace.h"
 #include "webrtc/test/gtest.h"
 #include "webrtc/test/testsupport/fileutils.h"
 #include "webrtc/typedefs.h"

 namespace webrtc {

 #define MAX_FILE_NAME_LENGTH_BYTE 500

 TwoWayCommunication::TwoWayCommunication(int testMode)
     : _acmA(AudioCodingModule::Create(1)),
       _acmRefA(AudioCodingModule::Create(3)),
       _testMode(testMode) {
   AudioCodingModule::Config config;
   // The clicks will be more obvious in FAX mode. TODO(henrik.lundin) Really?
   config.neteq_config.playout_mode = kPlayoutFax;
   config.id = 2;
   config.decoder_factory = CreateBuiltinAudioDecoderFactory();
   _acmB.reset(AudioCodingModule::Create(config));
   config.id = 4;
   _acmRefB.reset(AudioCodingModule::Create(config));
 }

 TwoWayCommunication::~TwoWayCommunication() {
   delete _channel_A2B;
   delete _channel_B2A;
   delete _channelRef_A2B;
   delete _channelRef_B2A;
   _inFileA.Close();
   _inFileB.Close();
   _outFileA.Close();
   _outFileB.Close();
   _outFileRefA.Close();
   _outFileRefB.Close();
 }

 void TwoWayCommunication::ChooseCodec(uint8_t* codecID_A,
                                       uint8_t* codecID_B) {
   std::unique_ptr<AudioCodingModule> tmpACM(AudioCodingModule::Create(0));
   uint8_t noCodec = tmpACM->NumberOfCodecs();
   CodecInst codecInst;
   printf("List of Supported Codecs\n");
   printf("========================\n");
   for (uint8_t codecCntr = 0; codecCntr < noCodec; codecCntr++) {
     EXPECT_EQ(tmpACM->Codec(codecCntr, &codecInst), 0);
     printf("%d- %s\n", codecCntr, codecInst.plname);
   }
   printf("\nChoose a send codec for side A [0]: ");
   char myStr[15] = "";
   EXPECT_TRUE(fgets(myStr, 10, stdin) != NULL);
   *codecID_A = (uint8_t) atoi(myStr);

   printf("\nChoose a send codec for side B [0]: ");
   EXPECT_TRUE(fgets(myStr, 10, stdin) != NULL);
   *codecID_B = (uint8_t) atoi(myStr);

   printf("\n");
 }

 void TwoWayCommunication::SetUp() {
   uint8_t codecID_A;
   uint8_t codecID_B;

   ChooseCodec(&codecID_A, &codecID_B);
   CodecInst codecInst_A;
   CodecInst codecInst_B;
   CodecInst dummyCodec;
   EXPECT_EQ(0, _acmA->Codec(codecID_A, &codecInst_A));
   EXPECT_EQ(0, _acmB->Codec(codecID_B, &codecInst_B));
   EXPECT_EQ(0, _acmA->Codec(6, &dummyCodec));

   //--- Set A codecs
   EXPECT_EQ(0, _acmA->RegisterSendCodec(codecInst_A));
   EXPECT_EQ(true, _acmA->RegisterReceiveCodec(codecInst_B.pltype,
                                               CodecInstToSdp(codecInst_B)));
   //--- Set ref-A codecs
   EXPECT_EQ(0, _acmRefA->RegisterSendCodec(codecInst_A));
   EXPECT_EQ(true, _acmRefA->RegisterReceiveCodec(codecInst_B.pltype,
                                                  CodecInstToSdp(codecInst_B)));

   //--- Set B codecs
   EXPECT_EQ(0, _acmB->RegisterSendCodec(codecInst_B));
   EXPECT_EQ(true, _acmB->RegisterReceiveCodec(codecInst_A.pltype,
                                               CodecInstToSdp(codecInst_A)));

   //--- Set ref-B codecs
   EXPECT_EQ(0, _acmRefB->RegisterSendCodec(codecInst_B));
   EXPECT_EQ(true, _acmRefB->RegisterReceiveCodec(codecInst_A.pltype,
                                                  CodecInstToSdp(codecInst_A)));

   uint16_t frequencyHz;

   //--- Input A
   std::string in_file_name = webrtc::test::ResourcePath(
       "audio_coding/testfile32kHz", "pcm");
   frequencyHz = 32000;
   printf("Enter input file at side A [%s]: ", in_file_name.c_str());
   PCMFile::ChooseFile(&in_file_name, 499, &frequencyHz);
   _inFileA.Open(in_file_name, frequencyHz, "rb");

   //--- Output A
   std::string out_file_a = webrtc::test::OutputPath() + "outA.pcm";
   printf("Output file at side A: %s\n", out_file_a.c_str());
   printf("Sampling frequency (in Hz) of the above file: %u\n", frequencyHz);
   _outFileA.Open(out_file_a, frequencyHz, "wb");
   std::string ref_file_name = webrtc::test::OutputPath() + "ref_outA.pcm";
   _outFileRefA.Open(ref_file_name, frequencyHz, "wb");

   //--- Input B
   in_file_name = webrtc::test::ResourcePath("audio_coding/testfile32kHz",
                                             "pcm");
   frequencyHz = 32000;
   printf("\n\nEnter input file at side B [%s]: ", in_file_name.c_str());
   PCMFile::ChooseFile(&in_file_name, 499, &frequencyHz);
   _inFileB.Open(in_file_name, frequencyHz, "rb");

   //--- Output B
   std::string out_file_b = webrtc::test::OutputPath() + "outB.pcm";
   printf("Output file at side B: %s\n", out_file_b.c_str());
   printf("Sampling frequency (in Hz) of the above file: %u\n", frequencyHz);
   _outFileB.Open(out_file_b, frequencyHz, "wb");
   ref_file_name = webrtc::test::OutputPath() + "ref_outB.pcm";
   _outFileRefB.Open(ref_file_name, frequencyHz, "wb");

   //--- Set A-to-B channel
   _channel_A2B = new Channel;
   _acmA->RegisterTransportCallback(_channel_A2B);
   _channel_A2B->RegisterReceiverACM(_acmB.get());
   //--- Do the same for the reference
   _channelRef_A2B = new Channel;
   _acmRefA->RegisterTransportCallback(_channelRef_A2B);
   _channelRef_A2B->RegisterReceiverACM(_acmRefB.get());

   //--- Set B-to-A channel
   _channel_B2A = new Channel;
   _acmB->RegisterTransportCallback(_channel_B2A);
   _channel_B2A->RegisterReceiverACM(_acmA.get());
   //--- Do the same for reference
   _channelRef_B2A = new Channel;
   _acmRefB->RegisterTransportCallback(_channelRef_B2A);
   _channelRef_B2A->RegisterReceiverACM(_acmRefA.get());
 }

 void TwoWayCommunication::SetUpAutotest() {
   CodecInst codecInst_A;
   CodecInst codecInst_B;
   CodecInst dummyCodec;

   EXPECT_EQ(0, _acmA->Codec("ISAC", &codecInst_A, 16000, 1));
   EXPECT_EQ(0, _acmB->Codec("L16", &codecInst_B, 8000, 1));
   EXPECT_EQ(0, _acmA->Codec(6, &dummyCodec));

   //--- Set A codecs
   EXPECT_EQ(0, _acmA->RegisterSendCodec(codecInst_A));
   EXPECT_EQ(true, _acmA->RegisterReceiveCodec(codecInst_B.pltype,
                                               CodecInstToSdp(codecInst_B)));

   //--- Set ref-A codecs
   EXPECT_GT(_acmRefA->RegisterSendCodec(codecInst_A), -1);
   EXPECT_EQ(true, _acmRefA->RegisterReceiveCodec(codecInst_B.pltype,
                                                  CodecInstToSdp(codecInst_B)));

   //--- Set B codecs
   EXPECT_GT(_acmB->RegisterSendCodec(codecInst_B), -1);
   EXPECT_EQ(true, _acmB->RegisterReceiveCodec(codecInst_A.pltype,
                                               CodecInstToSdp(codecInst_A)));

   //--- Set ref-B codecs
   EXPECT_EQ(0, _acmRefB->RegisterSendCodec(codecInst_B));
   EXPECT_EQ(true, _acmRefB->RegisterReceiveCodec(codecInst_A.pltype,
                                                  CodecInstToSdp(codecInst_A)));

   uint16_t frequencyHz;

   //--- Input A and B
   std::string in_file_name = webrtc::test::ResourcePath(
       "audio_coding/testfile32kHz", "pcm");
   frequencyHz = 16000;
   _inFileA.Open(in_file_name, frequencyHz, "rb");
   _inFileB.Open(in_file_name, frequencyHz, "rb");

   //--- Output A
   std::string output_file_a = webrtc::test::OutputPath() + "outAutotestA.pcm";
   frequencyHz = 16000;
   _outFileA.Open(output_file_a, frequencyHz, "wb");
   std::string output_ref_file_a = webrtc::test::OutputPath()
       + "ref_outAutotestA.pcm";
   _outFileRefA.Open(output_ref_file_a, frequencyHz, "wb");

   //--- Output B
   std::string output_file_b = webrtc::test::OutputPath() + "outAutotestB.pcm";
   frequencyHz = 16000;
   _outFileB.Open(output_file_b, frequencyHz, "wb");
   std::string output_ref_file_b = webrtc::test::OutputPath()
       + "ref_outAutotestB.pcm";
   _outFileRefB.Open(output_ref_file_b, frequencyHz, "wb");

   //--- Set A-to-B channel
   _channel_A2B = new Channel;
   _acmA->RegisterTransportCallback(_channel_A2B);
   _channel_A2B->RegisterReceiverACM(_acmB.get());
   //--- Do the same for the reference
   _channelRef_A2B = new Channel;
   _acmRefA->RegisterTransportCallback(_channelRef_A2B);
   _channelRef_A2B->RegisterReceiverACM(_acmRefB.get());

   //--- Set B-to-A channel
   _channel_B2A = new Channel;
   _acmB->RegisterTransportCallback(_channel_B2A);
   _channel_B2A->RegisterReceiverACM(_acmA.get());
   //--- Do the same for reference
   _channelRef_B2A = new Channel;
   _acmRefB->RegisterTransportCallback(_channelRef_B2A);
   _channelRef_B2A->RegisterReceiverACM(_acmRefA.get());
 }

 void TwoWayCommunication::Perform() {
   if (_testMode == 0) {
     SetUpAutotest();
   } else {
     SetUp();
   }
   unsigned int msecPassed = 0;
   unsigned int secPassed = 0;

   int32_t outFreqHzA = _outFileA.SamplingFrequency();
   int32_t outFreqHzB = _outFileB.SamplingFrequency();

   AudioFrame audioFrame;

   auto codecInst_B = _acmB->SendCodec();
   ASSERT_TRUE(codecInst_B);

   // In the following loop we tests that the code can handle misuse of the APIs.
   // In the middle of a session with data flowing between two sides, called A
   // and B, APIs will be called, and the code should continue to run, and be
   // able to recover.
   while (!_inFileA.EndOfFile() && !_inFileB.EndOfFile()) {
     msecPassed += 10;
     EXPECT_GT(_inFileA.Read10MsData(audioFrame), 0);
     EXPECT_GE(_acmA->Add10MsData(audioFrame), 0);
     EXPECT_GE(_acmRefA->Add10MsData(audioFrame), 0);

     EXPECT_GT(_inFileB.Read10MsData(audioFrame), 0);

     EXPECT_GE(_acmB->Add10MsData(audioFrame), 0);
     EXPECT_GE(_acmRefB->Add10MsData(audioFrame), 0);
     bool muted;
     EXPECT_EQ(0, _acmA->PlayoutData10Ms(outFreqHzA, &audioFrame, &muted));
     ASSERT_FALSE(muted);
     _outFileA.Write10MsData(audioFrame);
     EXPECT_EQ(0, _acmRefA->PlayoutData10Ms(outFreqHzA, &audioFrame, &muted));
     ASSERT_FALSE(muted);
     _outFileRefA.Write10MsData(audioFrame);
     EXPECT_EQ(0, _acmB->PlayoutData10Ms(outFreqHzB, &audioFrame, &muted));
     ASSERT_FALSE(muted);
     _outFileB.Write10MsData(audioFrame);
     EXPECT_EQ(0, _acmRefB->PlayoutData10Ms(outFreqHzB, &audioFrame, &muted));
     ASSERT_FALSE(muted);
     _outFileRefB.Write10MsData(audioFrame);

     // Update time counters each time a second of data has passed.
     if (msecPassed >= 1000) {
       msecPassed = 0;
       secPassed++;
     }
     // Re-register send codec on side B.
     if (((secPassed % 5) == 4) && (msecPassed >= 990)) {
       EXPECT_EQ(0, _acmB->RegisterSendCodec(*codecInst_B));
       EXPECT_TRUE(_acmB->SendCodec());
     }
     // Initialize receiver on side A.
     if (((secPassed % 7) == 6) && (msecPassed == 0))
       EXPECT_EQ(0, _acmA->InitializeReceiver());
     // Re-register codec on side A.
     if (((secPassed % 7) == 6) && (msecPassed >= 990)) {
       EXPECT_EQ(true, _acmA->RegisterReceiveCodec(
                           codecInst_B->pltype, CodecInstToSdp(*codecInst_B)));
     }
   }
 }

 }  // 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 "TwoWayCommunication.h"

	#include <ctype.h>
	#include <stdio.h>
	#include <string.h>

	#include <memory>

	#ifdef WIN32
	#include <Windows.h>
	#endif

	#include "webrtc/api/audio_codecs/builtin_audio_decoder_factory.h"
	#include "webrtc/common_types.h"
	#include "webrtc/modules/audio_coding/codecs/audio_format_conversion.h"
	#include "webrtc/modules/audio_coding/test/PCMFile.h"
	#include "webrtc/modules/audio_coding/test/utility.h"
	#include "webrtc/system_wrappers/include/trace.h"
	#include "webrtc/test/gtest.h"
	#include "webrtc/test/testsupport/fileutils.h"
	#include "webrtc/typedefs.h"

	namespace webrtc {

	#define MAX_FILE_NAME_LENGTH_BYTE 500

	TwoWayCommunication::TwoWayCommunication(int testMode)
	: _acmA(AudioCodingModule::Create(1)),
	_acmRefA(AudioCodingModule::Create(3)),
	_testMode(testMode) {
	AudioCodingModule::Config config;
	// The clicks will be more obvious in FAX mode. TODO(henrik.lundin) Really?
	config.neteq_config.playout_mode = kPlayoutFax;
	config.id = 2;
	config.decoder_factory = CreateBuiltinAudioDecoderFactory();
	_acmB.reset(AudioCodingModule::Create(config));
	config.id = 4;
	_acmRefB.reset(AudioCodingModule::Create(config));
	}

	TwoWayCommunication::~TwoWayCommunication() {
	delete _channel_A2B;
	delete _channel_B2A;
	delete _channelRef_A2B;
	delete _channelRef_B2A;
	_inFileA.Close();
	_inFileB.Close();
	_outFileA.Close();
	_outFileB.Close();
	_outFileRefA.Close();
	_outFileRefB.Close();
	}

	void TwoWayCommunication::ChooseCodec(uint8_t* codecID_A,
	uint8_t* codecID_B) {
	std::unique_ptr<AudioCodingModule> tmpACM(AudioCodingModule::Create(0));
	uint8_t noCodec = tmpACM->NumberOfCodecs();
	CodecInst codecInst;
	printf("List of Supported Codecs\n");
	printf("========================\n");
	for (uint8_t codecCntr = 0; codecCntr < noCodec; codecCntr++) {
	EXPECT_EQ(tmpACM->Codec(codecCntr, &codecInst), 0);
	printf("%d- %s\n", codecCntr, codecInst.plname);
	}
	printf("\nChoose a send codec for side A [0]: ");
	char myStr[15] = "";
	EXPECT_TRUE(fgets(myStr, 10, stdin) != NULL);
	*codecID_A = (uint8_t) atoi(myStr);

	printf("\nChoose a send codec for side B [0]: ");
	EXPECT_TRUE(fgets(myStr, 10, stdin) != NULL);
	*codecID_B = (uint8_t) atoi(myStr);

	printf("\n");
	}

	void TwoWayCommunication::SetUp() {
	uint8_t codecID_A;
	uint8_t codecID_B;

	ChooseCodec(&codecID_A, &codecID_B);
	CodecInst codecInst_A;
	CodecInst codecInst_B;
	CodecInst dummyCodec;
	EXPECT_EQ(0, _acmA->Codec(codecID_A, &codecInst_A));
	EXPECT_EQ(0, _acmB->Codec(codecID_B, &codecInst_B));
	EXPECT_EQ(0, _acmA->Codec(6, &dummyCodec));

	//--- Set A codecs
	EXPECT_EQ(0, _acmA->RegisterSendCodec(codecInst_A));
	EXPECT_EQ(true, _acmA->RegisterReceiveCodec(codecInst_B.pltype,
	CodecInstToSdp(codecInst_B)));
	//--- Set ref-A codecs
	EXPECT_EQ(0, _acmRefA->RegisterSendCodec(codecInst_A));
	EXPECT_EQ(true, _acmRefA->RegisterReceiveCodec(codecInst_B.pltype,
	CodecInstToSdp(codecInst_B)));

	//--- Set B codecs
	EXPECT_EQ(0, _acmB->RegisterSendCodec(codecInst_B));
	EXPECT_EQ(true, _acmB->RegisterReceiveCodec(codecInst_A.pltype,
	CodecInstToSdp(codecInst_A)));

	//--- Set ref-B codecs
	EXPECT_EQ(0, _acmRefB->RegisterSendCodec(codecInst_B));
	EXPECT_EQ(true, _acmRefB->RegisterReceiveCodec(codecInst_A.pltype,
	CodecInstToSdp(codecInst_A)));

	uint16_t frequencyHz;

	//--- Input A
	std::string in_file_name = webrtc::test::ResourcePath(
	"audio_coding/testfile32kHz", "pcm");
	frequencyHz = 32000;
	printf("Enter input file at side A [%s]: ", in_file_name.c_str());
	PCMFile::ChooseFile(&in_file_name, 499, &frequencyHz);
	_inFileA.Open(in_file_name, frequencyHz, "rb");

	//--- Output A
	std::string out_file_a = webrtc::test::OutputPath() + "outA.pcm";
	printf("Output file at side A: %s\n", out_file_a.c_str());
	printf("Sampling frequency (in Hz) of the above file: %u\n", frequencyHz);
	_outFileA.Open(out_file_a, frequencyHz, "wb");
	std::string ref_file_name = webrtc::test::OutputPath() + "ref_outA.pcm";
	_outFileRefA.Open(ref_file_name, frequencyHz, "wb");

	//--- Input B
	in_file_name = webrtc::test::ResourcePath("audio_coding/testfile32kHz",
	"pcm");
	frequencyHz = 32000;
	printf("\n\nEnter input file at side B [%s]: ", in_file_name.c_str());
	PCMFile::ChooseFile(&in_file_name, 499, &frequencyHz);
	_inFileB.Open(in_file_name, frequencyHz, "rb");

	//--- Output B
	std::string out_file_b = webrtc::test::OutputPath() + "outB.pcm";
	printf("Output file at side B: %s\n", out_file_b.c_str());
	printf("Sampling frequency (in Hz) of the above file: %u\n", frequencyHz);
	_outFileB.Open(out_file_b, frequencyHz, "wb");
	ref_file_name = webrtc::test::OutputPath() + "ref_outB.pcm";
	_outFileRefB.Open(ref_file_name, frequencyHz, "wb");

	//--- Set A-to-B channel
	_channel_A2B = new Channel;
	_acmA->RegisterTransportCallback(_channel_A2B);
	_channel_A2B->RegisterReceiverACM(_acmB.get());
	//--- Do the same for the reference
	_channelRef_A2B = new Channel;
	_acmRefA->RegisterTransportCallback(_channelRef_A2B);
	_channelRef_A2B->RegisterReceiverACM(_acmRefB.get());

	//--- Set B-to-A channel
	_channel_B2A = new Channel;
	_acmB->RegisterTransportCallback(_channel_B2A);
	_channel_B2A->RegisterReceiverACM(_acmA.get());
	//--- Do the same for reference
	_channelRef_B2A = new Channel;
	_acmRefB->RegisterTransportCallback(_channelRef_B2A);
	_channelRef_B2A->RegisterReceiverACM(_acmRefA.get());
	}

	void TwoWayCommunication::SetUpAutotest() {
	CodecInst codecInst_A;
	CodecInst codecInst_B;
	CodecInst dummyCodec;

	EXPECT_EQ(0, _acmA->Codec("ISAC", &codecInst_A, 16000, 1));
	EXPECT_EQ(0, _acmB->Codec("L16", &codecInst_B, 8000, 1));
	EXPECT_EQ(0, _acmA->Codec(6, &dummyCodec));

	//--- Set A codecs
	EXPECT_EQ(0, _acmA->RegisterSendCodec(codecInst_A));
	EXPECT_EQ(true, _acmA->RegisterReceiveCodec(codecInst_B.pltype,
	CodecInstToSdp(codecInst_B)));

	//--- Set ref-A codecs
	EXPECT_GT(_acmRefA->RegisterSendCodec(codecInst_A), -1);
	EXPECT_EQ(true, _acmRefA->RegisterReceiveCodec(codecInst_B.pltype,
	CodecInstToSdp(codecInst_B)));

	//--- Set B codecs
	EXPECT_GT(_acmB->RegisterSendCodec(codecInst_B), -1);
	EXPECT_EQ(true, _acmB->RegisterReceiveCodec(codecInst_A.pltype,
	CodecInstToSdp(codecInst_A)));

	//--- Set ref-B codecs
	EXPECT_EQ(0, _acmRefB->RegisterSendCodec(codecInst_B));
	EXPECT_EQ(true, _acmRefB->RegisterReceiveCodec(codecInst_A.pltype,
	CodecInstToSdp(codecInst_A)));

	uint16_t frequencyHz;

	//--- Input A and B
	std::string in_file_name = webrtc::test::ResourcePath(
	"audio_coding/testfile32kHz", "pcm");
	frequencyHz = 16000;
	_inFileA.Open(in_file_name, frequencyHz, "rb");
	_inFileB.Open(in_file_name, frequencyHz, "rb");

	//--- Output A
	std::string output_file_a = webrtc::test::OutputPath() + "outAutotestA.pcm";
	frequencyHz = 16000;
	_outFileA.Open(output_file_a, frequencyHz, "wb");
	std::string output_ref_file_a = webrtc::test::OutputPath()
	+ "ref_outAutotestA.pcm";
	_outFileRefA.Open(output_ref_file_a, frequencyHz, "wb");

	//--- Output B
	std::string output_file_b = webrtc::test::OutputPath() + "outAutotestB.pcm";
	frequencyHz = 16000;
	_outFileB.Open(output_file_b, frequencyHz, "wb");
	std::string output_ref_file_b = webrtc::test::OutputPath()
	+ "ref_outAutotestB.pcm";
	_outFileRefB.Open(output_ref_file_b, frequencyHz, "wb");

	//--- Set A-to-B channel
	_channel_A2B = new Channel;
	_acmA->RegisterTransportCallback(_channel_A2B);
	_channel_A2B->RegisterReceiverACM(_acmB.get());
	//--- Do the same for the reference
	_channelRef_A2B = new Channel;
	_acmRefA->RegisterTransportCallback(_channelRef_A2B);
	_channelRef_A2B->RegisterReceiverACM(_acmRefB.get());

	//--- Set B-to-A channel
	_channel_B2A = new Channel;
	_acmB->RegisterTransportCallback(_channel_B2A);
	_channel_B2A->RegisterReceiverACM(_acmA.get());
	//--- Do the same for reference
	_channelRef_B2A = new Channel;
	_acmRefB->RegisterTransportCallback(_channelRef_B2A);
	_channelRef_B2A->RegisterReceiverACM(_acmRefA.get());
	}

	void TwoWayCommunication::Perform() {
	if (_testMode == 0) {
	SetUpAutotest();
	} else {
	SetUp();
	}
	unsigned int msecPassed = 0;
	unsigned int secPassed = 0;

	int32_t outFreqHzA = _outFileA.SamplingFrequency();
	int32_t outFreqHzB = _outFileB.SamplingFrequency();

	AudioFrame audioFrame;

	auto codecInst_B = _acmB->SendCodec();
	ASSERT_TRUE(codecInst_B);

	// In the following loop we tests that the code can handle misuse of the APIs.
	// In the middle of a session with data flowing between two sides, called A
	// and B, APIs will be called, and the code should continue to run, and be
	// able to recover.
	while (!_inFileA.EndOfFile() && !_inFileB.EndOfFile()) {
	msecPassed += 10;
	EXPECT_GT(_inFileA.Read10MsData(audioFrame), 0);
	EXPECT_GE(_acmA->Add10MsData(audioFrame), 0);
	EXPECT_GE(_acmRefA->Add10MsData(audioFrame), 0);

	EXPECT_GT(_inFileB.Read10MsData(audioFrame), 0);

	EXPECT_GE(_acmB->Add10MsData(audioFrame), 0);
	EXPECT_GE(_acmRefB->Add10MsData(audioFrame), 0);
	bool muted;
	EXPECT_EQ(0, _acmA->PlayoutData10Ms(outFreqHzA, &audioFrame, &muted));
	ASSERT_FALSE(muted);
	_outFileA.Write10MsData(audioFrame);
	EXPECT_EQ(0, _acmRefA->PlayoutData10Ms(outFreqHzA, &audioFrame, &muted));
	ASSERT_FALSE(muted);
	_outFileRefA.Write10MsData(audioFrame);
	EXPECT_EQ(0, _acmB->PlayoutData10Ms(outFreqHzB, &audioFrame, &muted));
	ASSERT_FALSE(muted);
	_outFileB.Write10MsData(audioFrame);
	EXPECT_EQ(0, _acmRefB->PlayoutData10Ms(outFreqHzB, &audioFrame, &muted));
	ASSERT_FALSE(muted);
	_outFileRefB.Write10MsData(audioFrame);

	// Update time counters each time a second of data has passed.
	if (msecPassed >= 1000) {
	msecPassed = 0;
	secPassed++;
	}
	// Re-register send codec on side B.
	if (((secPassed % 5) == 4) && (msecPassed >= 990)) {
	EXPECT_EQ(0, _acmB->RegisterSendCodec(*codecInst_B));
	EXPECT_TRUE(_acmB->SendCodec());
	}
	// Initialize receiver on side A.
	if (((secPassed % 7) == 6) && (msecPassed == 0))
	EXPECT_EQ(0, _acmA->InitializeReceiver());
	// Re-register codec on side A.
	if (((secPassed % 7) == 6) && (msecPassed >= 990)) {
	EXPECT_EQ(true, _acmA->RegisterReceiveCodec(
	codecInst_B->pltype, CodecInstToSdp(*codecInst_B)));
	}
	}
	}

	} // namespace webrtc