Audio related IPC messages and handlers from browser to renderer

chrome/renderer/render_view.h

 // Copyright (c) 2006-2008 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 CHROME_RENDERER_RENDER_VIEW_H_
 #define CHROME_RENDERER_RENDER_VIEW_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/gfx/point.h"
 #include "base/gfx/rect.h"
+#include "base/id_map.h"
+#include "base/shared_memory.h"
 #include "base/timer.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "chrome/common/resource_dispatcher.h"
 #ifdef CHROME_PERSONALIZATION
 #include "chrome/personalization/personalization.h"
 #endif
 #include "chrome/renderer/automation/dom_automation_controller.h"
 #include "chrome/renderer/dom_ui_bindings.h"
 #include "chrome/renderer/external_host_bindings.h"
 #include "chrome/renderer/external_js_object.h"
 #include "chrome/renderer/render_widget.h"
+#include "media/audio/audio_output.h"
 #include "testing/gtest/include/gtest/gtest_prod.h"
 #include "webkit/glue/console_message_level.h"
 #include "webkit/glue/dom_serializer_delegate.h"
 #include "webkit/glue/form_data.h"
 #include "webkit/glue/password_form_dom_manager.h"
 #include "webkit/glue/webview_delegate.h"
 #include "webkit/glue/webview.h"
 
 #if defined(OS_WIN)
 // RenderView is a diamond-shaped hierarchy, with WebWidgetDelegate at the root.
 // VS warns when we inherit the WebWidgetDelegate method implementations from
 // RenderWidget.  It's safe to ignore that warning.
 #pragma warning(disable: 4250)
 #endif
 
+class AudioRendererImpl;
 class DictionaryValue;
 class DebugMessageHandler;
 class FilePath;
 class GlueAccessibility;
 class GURL;
 class RenderThread;
 class ResourceDispatcher;
 class SkBitmap;
 class WebError;
 class WebFrame;
@@ skipping 284 matching lines @@
   void set_delay_seconds_for_form_state_sync(int delay_in_seconds) {
     delay_seconds_for_form_state_sync_ = delay_in_seconds;
   }
 
   // Returns a message loop of type IO that can be used to run I/O jobs. The
   // renderer thread is of type TYPE_DEFAULT, so doesn't support everything
   // needed by some consumers. The returned thread will be the main thread of
   // the renderer, which processes all IPC, to any I/O should be non-blocking.
   MessageLoop* GetMessageLoopForIO();
 
+  // Register the audio renderer and try to create an audio output stream in the
+  // browser process. Always return a stream id. Audio renderer will then
+  // receive state change notification messages.
+  int32 CreateAudioStream(AudioRendererImpl* renderer,
+                          AudioManager::Format format, int channels,
+                          int sample_rate, int bits_per_sample,
+                          size_t packet_size);
+  void StartAudioStream(int stream_id);
+  void CloseAudioStream(int stream_id);
+  void NotifyAudioPacketReady(int stream_id);
+  void GetAudioVolume(int stream_id);
+  void SetAudioVolume(int stream_id, double left, double right);
+
  private:
   FRIEND_TEST(RenderViewTest, OnLoadAlternateHTMLText);
   FRIEND_TEST(RenderViewTest, OnNavStateChanged);
   FRIEND_TEST(RenderViewTest, OnImeStateChanged);
 
   explicit RenderView(RenderThreadBase* render_thread);
 
   // Initializes this view with the given parent and ID. The |routing_id| can be
   // set to 'MSG_ROUTING_NONE' if the true ID is not yet known. In this case,
   // CompleteInit must be called later with the true ID.
@@ skipping 162 matching lines @@
 #endif
 
   // Handles messages posted from automation.
   void OnMessageFromExternalHost(const std::string& target,
                                  const std::string& message);
 
   // Message that we should no longer be part of the current popup window
   // grouping, and should form our own grouping.
   void OnDisassociateFromPopupCount();
 
+  // Received when browser process wants more audio packet.
+  void OnRequestAudioPacket(int stream_id);
+
+  // Received when browser process has created an audio output stream for us.
+  void OnAudioStreamCreated(int stream_id, base::SharedMemoryHandle handle,
+                            int length);
+
+  // Received when internal state of browser process' audio output device has
+  // changed.
+  void OnAudioStreamStateChanged(int stream_id, AudioOutputStream::State state,
+                                 int info);
+
+  // Notification of volume property of an audio output stream.
+  void OnAudioStreamVolume(int stream_id, double left, double right);
+
   // Switches the frame's CSS media type to "print" and calculate the number of
   // printed pages that are to be expected. |frame| will be used to calculate
   // the number of expected pages for this frame only.
   int SwitchFrameToPrintMediaType(const ViewMsg_Print_Params& params,
                                   WebFrame* frame);
 
   // Switches the frame's CSS media type to "display".
   void SwitchFrameToDisplayMediaType(WebFrame* frame);
 
   // Prints the page listed in |params|.
@@ skipping 208 matching lines @@
   // this RenderView, that it is going to be blocked until we get a message
   // from the Browser process telling us otherwise.
   bool popup_notification_visible_;
 
   // Time in seconds of the delay between syncing page state such as form
   // elements and scroll position. This timeout allows us to avoid spamming the
   // browser process with every little thing that changes. This normally doesn't
   // change but is overridden by tests.
   int delay_seconds_for_form_state_sync_;
 
+  // A set of audio renderers registered to use IPC for audio output.
+  IDMap<AudioRendererImpl> audio_renderers_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderView);
 };
 
 #endif  // CHROME_RENDERER_RENDER_VIEW_H_