Android implementation of WebAudio audio file decoder

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "base/string16.h"
@@ skipping 2317 matching lines @@
                     float /* page_scale_factor */,
                     float /* min_page_scale_factor */,
                     float /* max_page_scale_factor */,
                     gfx::Size /* content_size */)
 
 // This message is an ACK that the batch state change has been received by
 // the renderer and all IME related messages should be processed accordingly.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_ImeBatchStateChanged_ACK,
                     bool /* is_begin */)
 
+// This message runs the MediaCodec for decoding audio for webaudio.
+IPC_MESSAGE_CONTROL2(ViewHostMsg_WebAudioMediaCodec,

[bulach, 2013/04/02 11:05:11]

nit: I think the message name should contain a verb, so this probably should be
ViewHostMsg_RunWebAudioMediaCodec ? ditto for the method it calls..

+                     base::SharedMemoryHandle /* encoded audio mem */,

[palmer, 2013/04/02 18:01:08]

Usually, these comments use descriptive, real variable names. E.g. /*
audio_memory */, /* pcm_data_sink */, or whatever. The actual IPC handler
functions should use those same variable names.

+                     base::FileDescriptor /* FD where pcm data is sent */)
+
 #elif defined(OS_MACOSX)
 // Request that the browser load a font into shared memory for us.
 IPC_SYNC_MESSAGE_CONTROL1_3(ViewHostMsg_LoadFont,
                            FontDescriptor /* font to load */,
                            uint32 /* buffer size */,
                            base::SharedMemoryHandle /* font data */,
                            uint32 /* font id */)
 
 // On OSX, we cannot allocated shared memory from within the sandbox, so
 // this call exists for the renderer to ask the browser to allocate memory
@@ skipping 27 matching lines @@
 // cached by the OS. Please see RenderMessageFilter::OnPreCacheFontCharacters
 // for details.
 IPC_SYNC_MESSAGE_CONTROL2_0(ViewHostMsg_PreCacheFontCharacters,
                             LOGFONT /* font_data */,
                             string16 /* characters */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.