First unit tests for WebRTCAudioDevice.

content/test/webrtc_audio_device_test.h

Index: content/test/webrtc_audio_device_test.h
===================================================================
--- content/test/webrtc_audio_device_test.h	(revision 0)
+++ content/test/webrtc_audio_device_test.h	(working copy)
@@ -0,0 +1,190 @@
+// Copyright (c) 2011 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.
+
+#ifndef CONTENT_TEST_WEBRTC_AUDIO_DEVICE_TEST_H_
+#define CONTENT_TEST_WEBRTC_AUDIO_DEVICE_TEST_H_
+#pragma once
+
+#include "base/file_path.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/browser/renderer_host/media/mock_media_observer.h"
+#include "content/renderer/media/audio_renderer_impl.h"
+#include "content/renderer/mock_content_renderer_client.h"
+#include "ipc/ipc_channel.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/webrtc/common_types.h"
+
+class AudioInputRendererHost;
+class AudioRendererHost;
+class RenderThreadImpl;
+class WebRTCMockRenderProcess;
+
+namespace content {
+class ContentRendererClient;
+class ResourceContext;
+class TestBrowserThread;
+}
+
+namespace net {
+class URLRequestContext;
+}
+
+namespace webrtc {
+class VoENetwork;
+}
+
+// Scoped class for WebRTC interfaces.  Fetches the wrapped interface
+// in the constructor via WebRTC's GetInterface mechanism and then releases
+// the reference in the destructor.
+template<typename T>
+class ScopedWebRTCPtr {
+ public:
+  template<typename Engine>
+  explicit ScopedWebRTCPtr(Engine* e)
+      : ptr_(T::GetInterface(e)) {}
+  explicit ScopedWebRTCPtr(T* p) : ptr_(p) {}
+  ~ScopedWebRTCPtr() { reset(); }
+  T* operator->() const { return ptr_; }
+  T* get() const { return ptr_; }
+
+  // Releases the current pointer.
+  void reset() {
+    if (ptr_) {
+      ptr_->Release();
+      ptr_ = NULL;
+    }
+  }
+
+  bool valid() const { return ptr_ != NULL; }
+
+ private:
+  T* ptr_;
+};
+
+// Wrapper to automatically calling T::Delete in the destructor.
+// This is useful for some WebRTC objects that have their own Create/Delete
+// methods and we can't use our our scoped_* classes.
+template <typename T>
+class WebRTCAutoDelete {
+ public:
+  WebRTCAutoDelete() : ptr_(NULL) {}
+  explicit WebRTCAutoDelete(T* ptr) : ptr_(ptr) {}
+  ~WebRTCAutoDelete() { reset(); }
+
+  void reset() {
+    if (ptr_) {
+      T::Delete(ptr_);
+      ptr_ = NULL;
+    }
+  }
+
+  T* operator->() { return ptr_; }
+  T* get() const { return ptr_; }
+
+  bool valid() const { return ptr_ != NULL; }
+
+ protected:
+  T* ptr_;
+};
+
+// Individual tests can provide an implementation (or mock) of this interface
+// when the audio code queries for hardware capabilities on the IO thread.
+class AudioUtilInterface {
+ public:
+  virtual double GetAudioHardwareSampleRate() = 0;
+  virtual double GetAudioInputHardwareSampleRate() = 0;
+};
+
+// Implemented and defined the cc file.
+class ReplaceContentClientRenderer;
+
+class WebRTCAudioDeviceTest
+    : public ::testing::Test,
+      public IPC::Channel::Listener {
+ public:
+  class SetupTask : public base::RefCountedThreadSafe<SetupTask> {
+   public:
+    explicit SetupTask(WebRTCAudioDeviceTest* test) : test_(test) {
+      DCHECK(test);  // Catch this early since we dereference much later.
+    }
+    void InitializeIOThread(const char* thread_name) {
+      test_->InitializeIOThread(thread_name);
+    }
+    void UninitializeIOThread() { test_->UninitializeIOThread(); }
+   protected:
+    WebRTCAudioDeviceTest* test_;
+  };
+
+  WebRTCAudioDeviceTest();
+  virtual ~WebRTCAudioDeviceTest();
+
+  virtual void SetUp();
+  virtual void TearDown();
+
+  // Sends an IPC message to the IO thread channel.
+  bool Send(IPC::Message* message);
+
+  void set_audio_util_callback(AudioUtilInterface* callback) {
+    audio_util_callback_ = callback;
+  }
+
+ protected:
+  void InitializeIOThread(const char* thread_name);
+  void UninitializeIOThread();
+  void CreateChannel(const char* name,
+                     content::ResourceContext* resource_context);
+  void DestroyChannel();
+
+  void OnGetHardwareSampleRate(double* sample_rate);
+  void OnGetHardwareInputSampleRate(double* sample_rate);
+
+  // IPC::Channel::Listener implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message);
+
+  // Posts a final task to the IO message loop and waits for completion.
+  void WaitForIOThreadCompletion();
+
+  // Convenience getter for gmock.
+  MockMediaObserver& media_observer() const {
+    return *media_observer_.get();
+  }
+
+  std::string GetTestDataPath(const FilePath::StringType& file_name);
+
+  scoped_ptr<ReplaceContentClientRenderer> saved_content_renderer_;
+  MessageLoopForUI message_loop_;
+  content::MockContentRendererClient mock_content_renderer_client_;
+  RenderThreadImpl* render_thread_;  // Owned by mock_process_.
+  scoped_ptr<WebRTCMockRenderProcess> mock_process_;
+  base::WaitableEvent event_;
+  scoped_ptr<MockMediaObserver> media_observer_;
+  scoped_ptr<content::ResourceContext> resource_context_;
+  scoped_refptr<net::URLRequestContext> test_request_context_;
+  scoped_ptr<IPC::Channel> channel_;
+  scoped_refptr<AudioRendererHost> audio_render_host_;
+  AudioUtilInterface* audio_util_callback_;  // Weak reference.
+
+  // Initialized on the main test thread that we mark as the UI thread.
+  scoped_ptr<content::TestBrowserThread> ui_thread_;
+  // Initialized on our IO thread to satisfy BrowserThread::IO checks.
+  scoped_ptr<content::TestBrowserThread> io_thread_;
+};
+
+// A very basic implementation of webrtc::Transport that acts as a transport
+// but just forwards all calls to a local webrtc::VoENetwork implementation.
+// Ownership of the VoENetwork object lies outside the class.
+class WebRTCTransportImpl : public webrtc::Transport {
+ public:
+  explicit WebRTCTransportImpl(webrtc::VoENetwork* network);
+  virtual ~WebRTCTransportImpl();
+
+  virtual int SendPacket(int channel, const void* data, int len);
+  virtual int SendRTCPPacket(int channel, const void* data, int len);
+
+ private:
+  webrtc::VoENetwork* network_;
+};
+
+#endif  // CONTENT_TEST_WEBRTC_AUDIO_DEVICE_TEST_H_
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