// Copyright (c) 2012 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 <string>

#include "base/command_line.h"
#include "base/message_loop.h"
#include "base/message_loop_proxy.h"
#include "media/audio/audio_output_dispatcher_impl.h"
#include "media/audio/audio_output_proxy.h"
#include "media/audio/audio_output_resampler.h"
#include "media/audio/audio_manager.h"
#include "media/audio/audio_manager_base.h"
#include "media/audio/fake_audio_output_stream.h"
#include "media/base/media_switches.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

using ::testing::_;
using ::testing::AllOf;
using ::testing::DoAll;
using ::testing::Field;
using ::testing::Mock;
using ::testing::NotNull;
using ::testing::Return;
using ::testing::SetArrayArgument;
using media::AudioBus;
using media::AudioBuffersState;
using media::AudioInputStream;
using media::AudioManager;
using media::AudioManagerBase;
using media::AudioOutputDispatcher;
using media::AudioOutputProxy;
using media::AudioOutputStream;
using media::AudioParameters;
using media::FakeAudioOutputStream;

namespace {

static const int kTestCloseDelayMs = 100;

// Used in the test where we don't want a stream to be closed unexpectedly.
static const int kTestBigCloseDelaySeconds = 1000;

// Delay between callbacks to AudioSourceCallback::OnMoreData.
static const int kOnMoreDataCallbackDelayMs = 10;

// Let start run long enough for many OnMoreData callbacks to occur.
static const int kStartRunTimeMs = kOnMoreDataCallbackDelayMs * 10;

class MockAudioOutputStream : public AudioOutputStream {
 public:
  MockAudioOutputStream(AudioManagerBase* manager,
                        const AudioParameters& params)
      : start_called_(false),
        stop_called_(false),
        params_(params),
        fake_output_stream_(
            FakeAudioOutputStream::MakeFakeStream(manager, params_)) {
  }

  void Start(AudioSourceCallback* callback) {
    start_called_ = true;
    fake_output_stream_->Start(callback);
  }

  void Stop() {
    stop_called_ = true;
    fake_output_stream_->Stop();
  }

  ~MockAudioOutputStream() {}

  bool start_called() { return start_called_; }
  bool stop_called() { return stop_called_; }

  MOCK_METHOD0(Open, bool());
  MOCK_METHOD1(SetVolume, void(double volume));
  MOCK_METHOD1(GetVolume, void(double* volume));
  MOCK_METHOD0(Close, void());

 private:
  bool start_called_;
  bool stop_called_;
  AudioParameters params_;
  scoped_ptr<AudioOutputStream> fake_output_stream_;
};

class MockAudioManager : public AudioManagerBase {
 public:
  MockAudioManager() {}
  virtual ~MockAudioManager() {
    Shutdown();
  }

  MOCK_METHOD0(HasAudioOutputDevices, bool());
  MOCK_METHOD0(HasAudioInputDevices, bool());
  MOCK_METHOD0(GetAudioInputDeviceModel, string16());
  MOCK_METHOD1(MakeAudioOutputStream, AudioOutputStream*(
      const AudioParameters& params));
  MOCK_METHOD1(MakeAudioOutputStreamProxy, AudioOutputStream*(
      const AudioParameters& params));
  MOCK_METHOD2(MakeAudioInputStream, AudioInputStream*(
      const AudioParameters& params, const std::string& device_id));
  MOCK_METHOD0(ShowAudioInputSettings, void());
  MOCK_METHOD0(GetMessageLoop, scoped_refptr<base::MessageLoopProxy>());
  MOCK_METHOD1(GetAudioInputDeviceNames, void(
      media::AudioDeviceNames* device_name));
  MOCK_METHOD0(IsRecordingInProcess, bool());

  MOCK_METHOD1(MakeLinearOutputStream, AudioOutputStream*(
      const AudioParameters& params));
  MOCK_METHOD1(MakeLowLatencyOutputStream, AudioOutputStream*(
      const AudioParameters& params));
  MOCK_METHOD2(MakeLinearInputStream, AudioInputStream*(
      const AudioParameters& params, const std::string& device_id));
  MOCK_METHOD2(MakeLowLatencyInputStream, AudioInputStream*(
      const AudioParameters& params, const std::string& device_id));
};

class MockAudioSourceCallback : public AudioOutputStream::AudioSourceCallback {
 public:
  int OnMoreData(AudioBus* audio_bus, AudioBuffersState buffers_state) {
    audio_bus->Zero();
    return audio_bus->frames();
  }
  int OnMoreIOData(AudioBus* source, AudioBus* dest,
                   AudioBuffersState buffers_state) {
    return OnMoreData(dest, buffers_state);
  }
  MOCK_METHOD2(OnError, void(AudioOutputStream* stream, int code));
};

}  // namespace

namespace media {

class AudioOutputProxyTest : public testing::Test {
 protected:
  virtual void SetUp() {
    EXPECT_CALL(manager_, GetMessageLoop())
        .WillRepeatedly(Return(message_loop_.message_loop_proxy()));
    InitDispatcher(base::TimeDelta::FromMilliseconds(kTestCloseDelayMs));
  }

  virtual void TearDown() {
    // All paused proxies should have been closed at this point.
    EXPECT_EQ(0u, dispatcher_impl_->paused_proxies_);

    // This is necessary to free all proxy objects that have been
    // closed by the test.
    message_loop_.RunUntilIdle();
  }

  virtual void InitDispatcher(base::TimeDelta close_delay) {
    // Use a low sample rate and large buffer size when testing otherwise the
    // FakeAudioOutputStream will keep the message loop busy indefinitely; i.e.,
    // RunUntilIdle() will never terminate.
    params_ = AudioParameters(AudioParameters::AUDIO_PCM_LINEAR,
                              CHANNEL_LAYOUT_STEREO, 8000, 16, 2048);
    dispatcher_impl_ = new AudioOutputDispatcherImpl(&manager(),
                                                     params_,
                                                     close_delay);

    // Necessary to know how long the dispatcher will wait before posting
    // StopStreamTask.
    pause_delay_ = dispatcher_impl_->pause_delay_;
  }

  virtual void OnStart() {}

  MockAudioManager& manager() {
    return manager_;
  }

  // Wait for the close timer to fire.
  void WaitForCloseTimer(const int timer_delay_ms) {
    message_loop_.RunUntilIdle();  // OpenTask() may reset the timer.
    base::PlatformThread::Sleep(
        base::TimeDelta::FromMilliseconds(timer_delay_ms) * 2);
    message_loop_.RunUntilIdle();
  }

  // Methods that do actual tests.
  void OpenAndClose(AudioOutputDispatcher* dispatcher) {
    MockAudioOutputStream stream(&manager_, params_);

    EXPECT_CALL(manager(), MakeAudioOutputStream(_))
        .WillOnce(Return(&stream));
    EXPECT_CALL(stream, Open())
        .WillOnce(Return(true));
    EXPECT_CALL(stream, Close())
        .Times(1);

    AudioOutputProxy* proxy = new AudioOutputProxy(dispatcher);
    EXPECT_TRUE(proxy->Open());
    proxy->Close();
    WaitForCloseTimer(kTestCloseDelayMs);
  }

  // Create a stream, and then calls Start() and Stop().
  void StartAndStop(AudioOutputDispatcher* dispatcher) {
    MockAudioOutputStream stream(&manager_, params_);

    EXPECT_CALL(manager(), MakeAudioOutputStream(_))
        .WillOnce(Return(&stream));
    EXPECT_CALL(stream, Open())
        .WillOnce(Return(true));
    EXPECT_CALL(stream, SetVolume(_))
        .Times(1);
    EXPECT_CALL(stream, Close())
        .Times(1);

    AudioOutputProxy* proxy = new AudioOutputProxy(dispatcher);
    EXPECT_TRUE(proxy->Open());

    proxy->Start(&callback_);
    OnStart();
    proxy->Stop();

    proxy->Close();
    WaitForCloseTimer(kTestCloseDelayMs);
    EXPECT_TRUE(stream.stop_called());
    EXPECT_TRUE(stream.start_called());
  }

  // Verify that the stream is closed after Stop is called.
  void CloseAfterStop(AudioOutputDispatcher* dispatcher) {
    MockAudioOutputStream stream(&manager_, params_);

    EXPECT_CALL(manager(), MakeAudioOutputStream(_))
        .WillOnce(Return(&stream));
    EXPECT_CALL(stream, Open())
        .WillOnce(Return(true));
    EXPECT_CALL(stream, SetVolume(_))
        .Times(1);
    EXPECT_CALL(stream, Close())
        .Times(1);

    AudioOutputProxy* proxy = new AudioOutputProxy(dispatcher);
    EXPECT_TRUE(proxy->Open());

    proxy->Start(&callback_);
    OnStart();
    proxy->Stop();

    // Wait for StopStream() to post StopStreamTask().
    base::PlatformThread::Sleep(pause_delay_ * 2);
    WaitForCloseTimer(kTestCloseDelayMs);

    // Verify expectation before calling Close().
    Mock::VerifyAndClear(&stream);

    proxy->Close();
    EXPECT_TRUE(stream.stop_called());
    EXPECT_TRUE(stream.start_called());
  }

  // Create two streams, but don't start them. Only one device must be open.
  void TwoStreams(AudioOutputDispatcher* dispatcher) {
    MockAudioOutputStream stream(&manager_, params_);

    EXPECT_CALL(manager(), MakeAudioOutputStream(_))
        .WillOnce(Return(&stream));
    EXPECT_CALL(stream, Open())
        .WillOnce(Return(true));
    EXPECT_CALL(stream, Close())
        .Times(1);

    AudioOutputProxy* proxy1 = new AudioOutputProxy(dispatcher);
    AudioOutputProxy* proxy2 = new AudioOutputProxy(dispatcher);
    EXPECT_TRUE(proxy1->Open());
    EXPECT_TRUE(proxy2->Open());
    proxy1->Close();
    proxy2->Close();
    WaitForCloseTimer(kTestCloseDelayMs);
    EXPECT_FALSE(stream.stop_called());
    EXPECT_FALSE(stream.start_called());
  }

  // Open() method failed.
  void OpenFailed(AudioOutputDispatcher* dispatcher) {
    MockAudioOutputStream stream(&manager_, params_);

    EXPECT_CALL(manager(), MakeAudioOutputStream(_))
        .WillOnce(Return(&stream));
    EXPECT_CALL(stream, Open())
        .WillOnce(Return(false));
    EXPECT_CALL(stream, Close())
        .Times(1);

    AudioOutputProxy* proxy = new AudioOutputProxy(dispatcher);
    EXPECT_FALSE(proxy->Open());
    proxy->Close();
    WaitForCloseTimer(kTestCloseDelayMs);
    EXPECT_FALSE(stream.stop_called());
    EXPECT_FALSE(stream.start_called());
  }

  void CreateAndWait(AudioOutputDispatcher* dispatcher) {
    MockAudioOutputStream stream(&manager_, params_);

    EXPECT_CALL(manager(), MakeAudioOutputStream(_))
        .WillOnce(Return(&stream));
    EXPECT_CALL(stream, Open())
        .WillOnce(Return(true));
    EXPECT_CALL(stream, Close())
        .Times(1);

    AudioOutputProxy* proxy = new AudioOutputProxy(dispatcher);
    EXPECT_TRUE(proxy->Open());

    // Simulate a delay.
    base::PlatformThread::Sleep(
        base::TimeDelta::FromMilliseconds(kTestCloseDelayMs) * 2);
    message_loop_.RunUntilIdle();

    // Verify expectation before calling Close().
    Mock::VerifyAndClear(&stream);

    proxy->Close();
    EXPECT_FALSE(stream.stop_called());
    EXPECT_FALSE(stream.start_called());
  }

  void TwoStreams_OnePlaying(AudioOutputDispatcher* dispatcher) {
    MockAudioOutputStream stream1(&manager_, params_);
    MockAudioOutputStream stream2(&manager_, params_);

    EXPECT_CALL(manager(), MakeAudioOutputStream(_))
        .WillOnce(Return(&stream1))
        .WillOnce(Return(&stream2));

    EXPECT_CALL(stream1, Open())
        .WillOnce(Return(true));
    EXPECT_CALL(stream1, SetVolume(_))
        .Times(1);
    EXPECT_CALL(stream1, Close())
        .Times(1);

    EXPECT_CALL(stream2, Open())
        .WillOnce(Return(true));
    EXPECT_CALL(stream2, Close())
        .Times(1);

    AudioOutputProxy* proxy1 = new AudioOutputProxy(dispatcher);
    AudioOutputProxy* proxy2 = new AudioOutputProxy(dispatcher);
    EXPECT_TRUE(proxy1->Open());
    EXPECT_TRUE(proxy2->Open());

    proxy1->Start(&callback_);
    message_loop_.RunUntilIdle();
    OnStart();
    proxy1->Stop();

    proxy1->Close();
    proxy2->Close();
    EXPECT_TRUE(stream1.stop_called());
    EXPECT_TRUE(stream1.start_called());
    EXPECT_FALSE(stream2.stop_called());
    EXPECT_FALSE(stream2.start_called());
  }

  void TwoStreams_BothPlaying(AudioOutputDispatcher* dispatcher) {
    MockAudioOutputStream stream1(&manager_, params_);
    MockAudioOutputStream stream2(&manager_, params_);

    EXPECT_CALL(manager(), MakeAudioOutputStream(_))
        .WillOnce(Return(&stream1))
        .WillOnce(Return(&stream2));

    EXPECT_CALL(stream1, Open())
        .WillOnce(Return(true));
    EXPECT_CALL(stream1, SetVolume(_))
        .Times(1);
    EXPECT_CALL(stream1, Close())
        .Times(1);

    EXPECT_CALL(stream2, Open())
        .WillOnce(Return(true));
    EXPECT_CALL(stream2, SetVolume(_))
        .Times(1);
    EXPECT_CALL(stream2, Close())
        .Times(1);

    AudioOutputProxy* proxy1 = new AudioOutputProxy(dispatcher);
    AudioOutputProxy* proxy2 = new AudioOutputProxy(dispatcher);
    EXPECT_TRUE(proxy1->Open());
    EXPECT_TRUE(proxy2->Open());

    proxy1->Start(&callback_);
    proxy2->Start(&callback_);
    OnStart();
    proxy1->Stop();
    proxy2->Stop();

    proxy1->Close();
    proxy2->Close();
    EXPECT_TRUE(stream1.stop_called());
    EXPECT_TRUE(stream1.start_called());
    EXPECT_TRUE(stream2.stop_called());
    EXPECT_TRUE(stream2.start_called());
  }

  void StartFailed(AudioOutputDispatcher* dispatcher) {
    MockAudioOutputStream stream(&manager_, params_);

    EXPECT_CALL(manager(), MakeAudioOutputStream(_))
        .WillOnce(Return(&stream));
    EXPECT_CALL(stream, Open())
        .WillOnce(Return(true));
    EXPECT_CALL(stream, Close())
        .Times(1);

    AudioOutputProxy* proxy = new AudioOutputProxy(dispatcher_impl_);
    EXPECT_TRUE(proxy->Open());

    // Simulate a delay.
    base::PlatformThread::Sleep(
        base::TimeDelta::FromMilliseconds(kTestCloseDelayMs) * 2);
    message_loop_.RunUntilIdle();

    // Verify expectation before calling Close().
    Mock::VerifyAndClear(&stream);

    // |stream| is closed at this point. Start() should reopen it again.
    EXPECT_CALL(manager(), MakeAudioOutputStream(_))
        .WillOnce(Return(reinterpret_cast<AudioOutputStream*>(NULL)));

    EXPECT_CALL(callback_, OnError(_, _))
        .Times(1);

    proxy->Start(&callback_);

    Mock::VerifyAndClear(&callback_);

    proxy->Close();
  }

  MessageLoop message_loop_;
  scoped_refptr<AudioOutputDispatcherImpl> dispatcher_impl_;
  base::TimeDelta pause_delay_;
  MockAudioManager manager_;
  MockAudioSourceCallback callback_;
  AudioParameters params_;
};

class AudioOutputResamplerTest : public AudioOutputProxyTest {
 public:
  virtual void TearDown() {
    AudioOutputProxyTest::TearDown();
  }

  virtual void InitDispatcher(base::TimeDelta close_delay) OVERRIDE {
    AudioOutputProxyTest::InitDispatcher(close_delay);
    // Use a low sample rate and large buffer size when testing otherwise the
    // FakeAudioOutputStream will keep the message loop busy indefinitely; i.e.,
    // RunUntilIdle() will never terminate.
    resampler_params_ = AudioParameters(
        AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
        16000, 16, 1024);
    resampler_ = new AudioOutputResampler(
        &manager(), params_, resampler_params_, close_delay);
  }

  virtual void OnStart() OVERRIDE {
    // Let start run for a bit.
    message_loop_.RunUntilIdle();
    base::PlatformThread::Sleep(
        base::TimeDelta::FromMilliseconds(kStartRunTimeMs));
  }

 protected:
  AudioParameters resampler_params_;
  scoped_refptr<AudioOutputResampler> resampler_;
};

TEST_F(AudioOutputProxyTest, CreateAndClose) {
  AudioOutputProxy* proxy = new AudioOutputProxy(dispatcher_impl_);
  proxy->Close();
}

TEST_F(AudioOutputResamplerTest, CreateAndClose) {
  AudioOutputProxy* proxy = new AudioOutputProxy(resampler_);
  proxy->Close();
}

TEST_F(AudioOutputProxyTest, OpenAndClose) {
  OpenAndClose(dispatcher_impl_);
}

TEST_F(AudioOutputResamplerTest, OpenAndClose) {
  OpenAndClose(resampler_);
}

// Create a stream, and verify that it is closed after kTestCloseDelayMs.
// if it doesn't start playing.
TEST_F(AudioOutputProxyTest, CreateAndWait) {
  CreateAndWait(dispatcher_impl_);
}

// Create a stream, and verify that it is closed after kTestCloseDelayMs.
// if it doesn't start playing.
TEST_F(AudioOutputResamplerTest, CreateAndWait) {
  CreateAndWait(resampler_);
}

TEST_F(AudioOutputProxyTest, StartAndStop) {
  StartAndStop(dispatcher_impl_);
}

TEST_F(AudioOutputResamplerTest, StartAndStop) {
  StartAndStop(resampler_);
}

TEST_F(AudioOutputProxyTest, CloseAfterStop) {
  CloseAfterStop(dispatcher_impl_);
}

TEST_F(AudioOutputResamplerTest, CloseAfterStop) {
  CloseAfterStop(resampler_);
}

TEST_F(AudioOutputProxyTest, TwoStreams) {
  TwoStreams(dispatcher_impl_);
}

TEST_F(AudioOutputResamplerTest, TwoStreams) {
  TwoStreams(resampler_);
}

// Two streams: verify that second stream is allocated when the first
// starts playing.
TEST_F(AudioOutputProxyTest, TwoStreams_OnePlaying) {
  InitDispatcher(base::TimeDelta::FromSeconds(kTestBigCloseDelaySeconds));
  TwoStreams_OnePlaying(dispatcher_impl_);
}

TEST_F(AudioOutputResamplerTest, TwoStreams_OnePlaying) {
  InitDispatcher(base::TimeDelta::FromSeconds(kTestBigCloseDelaySeconds));
  TwoStreams_OnePlaying(resampler_);
}

// Two streams, both are playing. Dispatcher should not open a third stream.
TEST_F(AudioOutputProxyTest, TwoStreams_BothPlaying) {
  InitDispatcher(base::TimeDelta::FromSeconds(kTestBigCloseDelaySeconds));
  TwoStreams_BothPlaying(dispatcher_impl_);
}

TEST_F(AudioOutputResamplerTest, TwoStreams_BothPlaying) {
  InitDispatcher(base::TimeDelta::FromSeconds(kTestBigCloseDelaySeconds));
  TwoStreams_BothPlaying(resampler_);
}

TEST_F(AudioOutputProxyTest, OpenFailed) {
  OpenFailed(dispatcher_impl_);
}

TEST_F(AudioOutputResamplerTest, OpenFailed) {
  CommandLine::ForCurrentProcess()->AppendSwitch(
      switches::kDisableAudioFallback);
  OpenFailed(resampler_);
}

// Start() method failed.
TEST_F(AudioOutputProxyTest, StartFailed) {
  StartFailed(dispatcher_impl_);
}

TEST_F(AudioOutputResamplerTest, StartFailed) {
  StartFailed(resampler_);
}

// Simulate AudioOutputStream::Create() failure with a low latency stream and
// ensure AudioOutputResampler falls back to the high latency path.
TEST_F(AudioOutputResamplerTest, LowLatencyCreateFailedFallback) {
  MockAudioOutputStream stream(&manager_, params_);
  EXPECT_CALL(manager(), MakeAudioOutputStream(_))
      .Times(2)
      .WillOnce(Return(static_cast<AudioOutputStream*>(NULL)))
      .WillRepeatedly(Return(&stream));
  EXPECT_CALL(stream, Open())
      .WillOnce(Return(true));
  EXPECT_CALL(stream, Close())
      .Times(1);

  AudioOutputProxy* proxy = new AudioOutputProxy(resampler_);
  EXPECT_TRUE(proxy->Open());
  proxy->Close();
  WaitForCloseTimer(kTestCloseDelayMs);
}

// Simulate AudioOutputStream::Open() failure with a low latency stream and
// ensure AudioOutputResampler falls back to the high latency path.
TEST_F(AudioOutputResamplerTest, LowLatencyOpenFailedFallback) {
  MockAudioOutputStream failed_stream(&manager_, params_);
  MockAudioOutputStream okay_stream(&manager_, params_);
  EXPECT_CALL(manager(), MakeAudioOutputStream(_))
      .Times(2)
      .WillOnce(Return(&failed_stream))
      .WillRepeatedly(Return(&okay_stream));
  EXPECT_CALL(failed_stream, Open())
      .WillOnce(Return(false));
  EXPECT_CALL(failed_stream, Close())
      .Times(1);
  EXPECT_CALL(okay_stream, Open())
      .WillOnce(Return(true));
  EXPECT_CALL(okay_stream, Close())
      .Times(1);

  AudioOutputProxy* proxy = new AudioOutputProxy(resampler_);
  EXPECT_TRUE(proxy->Open());
  proxy->Close();
  WaitForCloseTimer(kTestCloseDelayMs);
}

// Simulate failures to open both the low latency and the fallback high latency
// stream and ensure AudioOutputResampler terminates normally.
TEST_F(AudioOutputResamplerTest, LowLatencyFallbackFailed) {
  EXPECT_CALL(manager(), MakeAudioOutputStream(_))
      .Times(2)
      .WillRepeatedly(Return(static_cast<AudioOutputStream*>(NULL)));

  AudioOutputProxy* proxy = new AudioOutputProxy(resampler_);
  EXPECT_FALSE(proxy->Open());
  proxy->Close();
  WaitForCloseTimer(kTestCloseDelayMs);
}

// Simulate an eventual OpenStream() failure; i.e. successful OpenStream() calls
// eventually followed by one which fails; root cause of http://crbug.com/150619
TEST_F(AudioOutputResamplerTest, LowLatencyOpenEventuallyFails) {
  MockAudioOutputStream stream1(&manager_, params_);
  MockAudioOutputStream stream2(&manager_, params_);
  MockAudioOutputStream stream3(&manager_, params_);

  // Setup the mock such that all three streams are successfully created.
  EXPECT_CALL(manager(), MakeAudioOutputStream(_))
      .WillOnce(Return(&stream1))
      .WillOnce(Return(&stream2))
      .WillOnce(Return(&stream3))
      .WillRepeatedly(Return(static_cast<AudioOutputStream*>(NULL)));

  // Stream1 should be able to successfully open and start.
  EXPECT_CALL(stream1, Open())
      .WillOnce(Return(true));
  EXPECT_CALL(stream1, Close())
      .Times(1);
  EXPECT_CALL(stream1, SetVolume(_))
      .Times(1);

  // Stream2 should also be able to successfully open and start.
  EXPECT_CALL(stream2, Open())
      .WillOnce(Return(true));
  EXPECT_CALL(stream2, Close())
      .Times(1);
  EXPECT_CALL(stream2, SetVolume(_))
      .Times(1);

  // Stream3 should fail on Open() (yet still be closed since
  // MakeAudioOutputStream returned a valid AudioOutputStream object).
  EXPECT_CALL(stream3, Open())
      .WillOnce(Return(false));
  EXPECT_CALL(stream3, Close())
      .Times(1);

  // Open and start the first proxy and stream.
  AudioOutputProxy* proxy1 = new AudioOutputProxy(resampler_);
  EXPECT_TRUE(proxy1->Open());
  proxy1->Start(&callback_);
  OnStart();

  // Open and start the second proxy and stream.
  AudioOutputProxy* proxy2 = new AudioOutputProxy(resampler_);
  EXPECT_TRUE(proxy2->Open());
  proxy2->Start(&callback_);
  OnStart();

  // Attempt to open the third stream which should fail.
  AudioOutputProxy* proxy3 = new AudioOutputProxy(resampler_);
  EXPECT_FALSE(proxy3->Open());

  // Perform the required Stop()/Close() shutdown dance for each proxy.  Under
  // the hood each proxy should correctly call CloseStream() if OpenStream()
  // succeeded or not.
  proxy3->Stop();
  proxy3->Close();
  proxy2->Stop();
  proxy2->Close();
  proxy1->Stop();
  proxy1->Close();

  // Wait for all of the messages to fly and then verify stream behavior.
  WaitForCloseTimer(kTestCloseDelayMs);
  EXPECT_TRUE(stream1.stop_called());
  EXPECT_TRUE(stream1.start_called());
  EXPECT_TRUE(stream2.stop_called());
  EXPECT_TRUE(stream2.start_called());
  EXPECT_FALSE(stream3.stop_called());
  EXPECT_FALSE(stream3.start_called());
}

}  // namespace media