Implement renderer AudioDevice API for low-latency audio output...

chrome/renderer/renderer_webkitclient_impl.cc

 // Copyright (c) 2010 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 "chrome/renderer/renderer_webkitclient_impl.h"
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/platform_file.h"
 #include "base/shared_memory.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/database_util.h"
 #include "chrome/common/file_system/webfilesystem_impl.h"
 #include "chrome/common/file_utilities_messages.h"
 #include "chrome/common/mime_registry_messages.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/webblobregistry_impl.h"
 #include "chrome/common/webmessageportchannel_impl.h"
 #include "chrome/plugin/npobject_util.h"
 #include "chrome/renderer/net/renderer_net_predictor.h"
 #include "chrome/renderer/render_thread.h"
 #include "chrome/renderer/render_view.h"
+#include "chrome/renderer/renderer_webaudiodevice_impl.h"
 #include "chrome/renderer/renderer_webidbfactory_impl.h"
 #include "chrome/renderer/renderer_webstoragenamespace_impl.h"
 #include "chrome/renderer/visitedlink_slave.h"
 #include "chrome/renderer/webgraphicscontext3d_command_buffer_impl.h"
 #include "chrome/renderer/websharedworkerrepository_impl.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_sync_message_filter.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebBlobRegistry.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebFrame.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebGraphicsContext3D.h"
@@ skipping 25 matching lines @@
 
 #include "base/lock.h"
 #include "chrome/renderer/renderer_sandbox_support_linux.h"
 #include "third_party/WebKit/WebKit/chromium/public/linux/WebSandboxSupport.h"
 #endif
 
 #if defined(OS_POSIX)
 #include "base/file_descriptor_posix.h"
 #endif
 
+using WebKit::WebAudioDevice;
 using WebKit::WebBlobRegistry;
 using WebKit::WebFileSystem;
 using WebKit::WebFrame;
 using WebKit::WebIDBFactory;
 using WebKit::WebIDBKey;
 using WebKit::WebIDBKeyPath;
 using WebKit::WebKitClient;
 using WebKit::WebSerializedScriptValue;
 using WebKit::WebStorageArea;
 using WebKit::WebStorageEventDispatcher;
@@ skipping 432 matching lines @@
     return WebKit::WebGraphicsContext3D::createDefault();
   } else {
 #if defined(ENABLE_GPU)
     return new WebGraphicsContext3DCommandBufferImpl();
 #else
     return NULL;
 #endif
   }
 }
 
+WebAudioDevice*
+RendererWebKitClientImpl::createAudioDevice(
+    size_t buffer_size,
+    unsigned channels,
+    double sample_rate,
+    WebAudioDevice::RenderCallback* callback) {
+  return new RendererWebAudioDeviceImpl(buffer_size,
+                                        channels,
+                                        sample_rate,
+                                        callback);
+}
+
 //------------------------------------------------------------------------------
 
 WebKit::WebString RendererWebKitClientImpl::signedPublicKeyAndChallengeString(
     unsigned key_size_index,
     const WebKit::WebString& challenge,
     const WebKit::WebURL& url) {
   std::string signed_public_key;
   RenderThread::current()->Send(new ViewHostMsg_Keygen(
       static_cast<uint32>(key_size_index),
       challenge.utf8(),
       GURL(url),
       &signed_public_key));
   return WebString::fromUTF8(signed_public_key);
 }
 
 //------------------------------------------------------------------------------
 
 WebBlobRegistry* RendererWebKitClientImpl::blobRegistry() {
   if (!blob_registry_.get())
     blob_registry_.reset(new WebBlobRegistryImpl(RenderThread::current()));
   return blob_registry_.get();
 }