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diff --git a/webrtc/modules/audio_coding/main/test/APITest.h b/webrtc/modules/audio_coding/main/test/APITest.h
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+/*
+ *  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.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_CODING_MAIN_TEST_APITEST_H_
+#define WEBRTC_MODULES_AUDIO_CODING_MAIN_TEST_APITEST_H_
+
+#include "webrtc/base/scoped_ptr.h"
+#include "webrtc/modules/audio_coding/main/include/audio_coding_module.h"
+#include "webrtc/modules/audio_coding/main/test/ACMTest.h"
+#include "webrtc/modules/audio_coding/main/test/Channel.h"
+#include "webrtc/modules/audio_coding/main/test/PCMFile.h"
+#include "webrtc/modules/audio_coding/main/test/utility.h"
+#include "webrtc/system_wrappers/include/event_wrapper.h"
+#include "webrtc/system_wrappers/include/rw_lock_wrapper.h"
+
+namespace webrtc {
+
+class Config;
+
+enum APITESTAction {
+  TEST_CHANGE_CODEC_ONLY = 0,
+  DTX_TEST = 1
+};
+
+class APITest : public ACMTest {
+ public:
+  explicit APITest(const Config& config);
+  ~APITest();
+
+  void Perform();
+ private:
+  int16_t SetUp();
+
+  static bool PushAudioThreadA(void* obj);
+  static bool PullAudioThreadA(void* obj);
+  static bool ProcessThreadA(void* obj);
+  static bool APIThreadA(void* obj);
+
+  static bool PushAudioThreadB(void* obj);
+  static bool PullAudioThreadB(void* obj);
+  static bool ProcessThreadB(void* obj);
+  static bool APIThreadB(void* obj);
+
+  void CheckVADStatus(char side);
+
+  // Set Min delay, get delay, playout timestamp
+  void TestDelay(char side);
+
+  // Unregister a codec & register again.
+  void TestRegisteration(char side);
+
+  // Playout Mode, background noise mode.
+  // Receiver Frequency, playout frequency.
+  void TestPlayout(char receiveSide);
+
+  //
+  void TestSendVAD(char side);
+
+  void CurrentCodec(char side);
+
+  void ChangeCodec(char side);
+
+  void Wait(uint32_t waitLengthMs);
+
+  void RunTest(char thread);
+
+  bool PushAudioRunA();
+  bool PullAudioRunA();
+  bool ProcessRunA();
+  bool APIRunA();
+
+  bool PullAudioRunB();
+  bool PushAudioRunB();
+  bool ProcessRunB();
+  bool APIRunB();
+
+  //--- ACMs
+  rtc::scoped_ptr<AudioCodingModule> _acmA;
+  rtc::scoped_ptr<AudioCodingModule> _acmB;
+
+  //--- Channels
+  Channel* _channel_A2B;
+  Channel* _channel_B2A;
+
+  //--- I/O files
+  // A
+  PCMFile _inFileA;
+  PCMFile _outFileA;
+  // B
+  PCMFile _outFileB;
+  PCMFile _inFileB;
+
+  //--- I/O params
+  // A
+  int32_t _outFreqHzA;
+  // B
+  int32_t _outFreqHzB;
+
+  // Should we write to file.
+  // we might skip writing to file if we
+  // run the test for a long time.
+  bool _writeToFile;
+  //--- Events
+  // A
+  EventTimerWrapper* _pullEventA;      // pulling data from ACM
+  EventTimerWrapper* _pushEventA;      // pushing data to ACM
+  EventTimerWrapper* _processEventA;   // process
+  EventWrapper* _apiEventA;       // API calls
+  // B
+  EventTimerWrapper* _pullEventB;      // pulling data from ACM
+  EventTimerWrapper* _pushEventB;      // pushing data to ACM
+  EventTimerWrapper* _processEventB;   // process
+  EventWrapper* _apiEventB;       // API calls
+
+  // keep track of the codec in either side.
+  uint8_t _codecCntrA;
+  uint8_t _codecCntrB;
+
+  // Is set to true if there is no encoder in either side
+  bool _thereIsEncoderA;
+  bool _thereIsEncoderB;
+  bool _thereIsDecoderA;
+  bool _thereIsDecoderB;
+
+  bool _sendVADA;
+  bool _sendDTXA;
+  ACMVADMode _sendVADModeA;
+
+  bool _sendVADB;
+  bool _sendDTXB;
+  ACMVADMode _sendVADModeB;
+
+  int32_t _minDelayA;
+  int32_t _minDelayB;
+  bool _payloadUsed[32];
+
+  bool _verbose;
+
+  int _dotPositionA;
+  int _dotMoveDirectionA;
+  int _dotPositionB;
+  int _dotMoveDirectionB;
+
+  char _movingDot[41];
+
+  VADCallback* _vadCallbackA;
+  VADCallback* _vadCallbackB;
+  RWLockWrapper& _apiTestRWLock;
+  bool _randomTest;
+  int _testNumA;
+  int _testNumB;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_CODING_MAIN_TEST_APITEST_H_