Audio related IPC messages and handlers from browser to renderer

chrome/common/render_messages_internal.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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 #include <string>
 #include <vector>
@@ skipping 478 matching lines @@
                       int /* id of the request message */,
                       std::vector<std::wstring> /* suggestions */,
                       int /* index of default suggestion */)
 
   // Sent by the Browser process to alert a window about whether a blocked
   // popup notification is visible. The renderer assumes every new window is a
   // blocked popup until notified otherwise.
   IPC_MESSAGE_ROUTED1(ViewMsg_PopupNotificationVisiblityChanged,
                       bool /* Whether it is visible */)
 
+  // Sent by AudioRendererHost to renderer to request an audio packet.
+  IPC_MESSAGE_ROUTED1(ViewMsg_RequestAudioPacket,
+                      int /* stream id */)
+
+  // Tell the renderer process that the audio stream has been created, renderer
+  // process would be given a ShareMemoryHandle that it should write to from
+  // then on.
+  IPC_MESSAGE_ROUTED3(ViewMsg_NotifyAudioStreamCreated,
+                      int /* stream id */,
+                      base::SharedMemoryHandle /* handle */,
+                      int /* length */)
+
+  // Notification message sent from AudioRendererHost to renderer for state
+  // update after the renderer has requested a Create/Start/Close.
+  IPC_MESSAGE_ROUTED3(ViewMsg_NotifyAudioStreamStateChanged,
+                      int /* stream id */,
+                      AudioOutputStream::State /* new state */,
+                      int /* additional information (e.g. platform specific
+                             error code*/)
+
+  IPC_MESSAGE_ROUTED3(ViewMsg_NotifyAudioStreamVolume,
+                      int /* stream id */,
+                      double /* left channel */,
+                      double /* right channel */)
+
 IPC_END_MESSAGES(View)
 
 
 //-----------------------------------------------------------------------------
 // WebContents messages
 // These are messages sent from the renderer to the browser process.
 
 IPC_BEGIN_MESSAGES(ViewHost)
   // Sent by the renderer when it is creating a new window.  The browser creates
   // a tab for it and responds with a ViewMsg_CreatingNew_ACK.  If route_id is
@@ skipping 653 matching lines @@
                       int /* stream_id */)
 
   // Set audio volume of the stream specified by (render_view_id, stream_id).
   // TODO(hclam): change this to vector if we have channel numbers other than 2.
   IPC_MESSAGE_ROUTED3(ViewHostMsg_SetAudioVolume,
                       int /* stream_id */,
                       double /* left_channel */,
                       double /* right_channel */)
 
 IPC_END_MESSAGES(ViewHost)