Introduce AudioHardwareConfig for renderer side audio device info.

content/renderer/render_thread_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 47 matching lines @@
 class CompositorThread;
 class DBMessageFilter;
 class DevToolsAgentFilter;
 class DomStorageDispatcher;
 class GpuChannelHost;
 class IndexedDBDispatcher;
 class MediaStreamCenter;
 class MediaStreamDependencyFactory;
 class P2PSocketDispatcher;
 class PeerConnectionTracker;
+class RendererAudioHardwareConfig;
 class RendererWebKitPlatformSupportImpl;
 class RenderProcessObserver;
 class VideoCaptureImplManager;
 class WebDatabaseObserverImpl;
 class WebGraphicsContext3DCommandBufferImpl;
 
 // The RenderThreadImpl class represents a background thread where RenderView
 // instances live.  The RenderThread supports an API that is used by its
 // consumer to talk indirectly to the RenderViews and supporting objects.
 // Likewise, it provides an API for the RenderViews to talk back to the main
@@ skipping 161 matching lines @@
   WebGraphicsContext3DCommandBufferImpl* GetGpuVDAContext3D();
 
   // Handle loss of the shared GpuVDAContext3D context above.
   static void OnGpuVDAContextLoss();
 
   // AudioRendererMixerManager instance which manages renderer side mixer
   // instances shared based on configured audio parameters.  Lazily created on
   // first call.
   AudioRendererMixerManager* GetAudioRendererMixerManager();
 
+  // RendererAudioHardwareConfig contains audio hardware configuration for
+  // renderer side clients.  Creation requires a synchronous IPC call so it is

[henrika (OOO until Aug 14), 2013/01/29 10:46:49]

Nit, does the sync IPC require lacy init?

[DaleCurtis, 2013/01/30 01:31:06]

What do you mean? We use lazy initialization because of the synchronous IPC, we
don't want to block render thread startup.

[henrika (OOO until Aug 14), 2013/01/30 10:10:06]

It was not clear to me if "sync IPC ===> lazy init" and what the exact
dependence was. I think I understand what you mean now. It was just how the
comment was formulated that made me confused.

+  // lazily created on the first call.
+  RendererAudioHardwareConfig* GetAudioHardwareConfig();
+
 #if defined(OS_WIN)
   void PreCacheFontCharacters(const LOGFONT& log_font, const string16& str);
 #endif
 
   // For producing custom V8 histograms. Custom histograms are produced if all
   // RenderViews share the same host, and the host is in the pre-specified set
   // of hosts we want to produce custom diagrams for. The name for a custom
   // diagram is the name of the corresponding generic diagram plus a
   // host-specific suffix.
   class CONTENT_EXPORT HistogramCustomizer {
@@ skipping 115 matching lines @@
   scoped_ptr<CompositorThread> compositor_thread_;
   scoped_refptr<IPC::ForwardingMessageFilter> compositor_output_surface_filter_;
 
   ObserverList<RenderProcessObserver> observers_;
 
   class GpuVDAContextLostCallback;
   scoped_ptr<GpuVDAContextLostCallback> context_lost_cb_;
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> gpu_vda_context3d_;
 
   scoped_ptr<AudioRendererMixerManager> audio_renderer_mixer_manager_;
+  scoped_ptr<RendererAudioHardwareConfig> audio_hardware_config_;
 
   HistogramCustomizer histogram_customizer_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_