First step towards moving AudioDevice from content/ to media/audio.

content/renderer/pepper/pepper_platform_audio_output_impl.cc

 // 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.
 
 #include "content/renderer/pepper/pepper_platform_audio_output_impl.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
 #include "build/build_config.h"
 #include "content/common/child_process.h"
 #include "content/common/media/audio_messages.h"
 #include "content/renderer/media/audio_hardware.h"
+#include "content/renderer/media/audio_message_filter.h"
 #include "content/renderer/render_thread_impl.h"
 
 namespace content {
 
 // static
 PepperPlatformAudioOutputImpl* PepperPlatformAudioOutputImpl::Create(
     int sample_rate,
     int frames_per_buffer,
     webkit::ppapi::PluginDelegate::PlatformAudioOutputClient* client) {
   scoped_refptr<PepperPlatformAudioOutputImpl> audio_output(
-      new PepperPlatformAudioOutputImpl);
+      new PepperPlatformAudioOutputImpl());
   if (audio_output->Initialize(sample_rate, frames_per_buffer, client)) {
     // Balanced by Release invoked in
     // PepperPlatformAudioOutputImpl::ShutDownOnIOThread().
     return audio_output.release();
   }
   return NULL;
 }
 
 bool PepperPlatformAudioOutputImpl::StartPlayback() {
-  if (filter_) {
+  if (ipc_) {
     ChildProcess::current()->io_message_loop()->PostTask(
         FROM_HERE,
         base::Bind(&PepperPlatformAudioOutputImpl::StartPlaybackOnIOThread,
                    this));
     return true;
   }
   return false;
 }
 
 bool PepperPlatformAudioOutputImpl::StopPlayback() {
-  if (filter_) {
+  if (ipc_) {
     ChildProcess::current()->io_message_loop()->PostTask(
         FROM_HERE,
         base::Bind(&PepperPlatformAudioOutputImpl::StopPlaybackOnIOThread,
                    this));
     return true;
   }
   return false;
 }
 
 void PepperPlatformAudioOutputImpl::ShutDown() {
   // Called on the main thread to stop all audio callbacks. We must only change
   // the client on the main thread, and the delegates from the I/O thread.
   client_ = NULL;
   ChildProcess::current()->io_message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&PepperPlatformAudioOutputImpl::ShutDownOnIOThread, this));
 }
 
-void PepperPlatformAudioOutputImpl::OnStateChanged(AudioStreamState state) {}
+void PepperPlatformAudioOutputImpl::OnStateChanged(
+    media::AudioOutputIPCDelegate::State state) {
+}
 
 void PepperPlatformAudioOutputImpl::OnStreamCreated(
     base::SharedMemoryHandle handle,
     base::SyncSocket::Handle socket_handle,
-    uint32 length) {
+    int length) {
 #if defined(OS_WIN)
   DCHECK(handle);
   DCHECK(socket_handle);
 #else
   DCHECK_NE(-1, handle.fd);
   DCHECK_NE(-1, socket_handle);
 #endif
   DCHECK(length);
 
   if (base::MessageLoopProxy::current() == main_message_loop_proxy_) {
     // Must dereference the client only on the main thread. Shutdown may have
     // occurred while the request was in-flight, so we need to NULL check.
     if (client_)
       client_->StreamCreated(handle, length, socket_handle);
   } else {
     main_message_loop_proxy_->PostTask(FROM_HERE,
         base::Bind(&PepperPlatformAudioOutputImpl::OnStreamCreated, this,
                    handle, socket_handle, length));
   }
 }
 
+void PepperPlatformAudioOutputImpl::OnIPCClosed() {
+  ipc_ = NULL;
+}
+
 PepperPlatformAudioOutputImpl::~PepperPlatformAudioOutputImpl() {
   // Make sure we have been shut down. Warning: this will usually happen on
   // the I/O thread!
   DCHECK_EQ(0, stream_id_);
   DCHECK(!client_);
 }
 
 PepperPlatformAudioOutputImpl::PepperPlatformAudioOutputImpl()
     : client_(NULL),
       stream_id_(0),
       main_message_loop_proxy_(base::MessageLoopProxy::current()) {
-  filter_ = RenderThreadImpl::current()->audio_message_filter();
+  ipc_ = RenderThreadImpl::current()->audio_message_filter();
 }
 
 bool PepperPlatformAudioOutputImpl::Initialize(
     int sample_rate,
     int frames_per_buffer,
     webkit::ppapi::PluginDelegate::PlatformAudioOutputClient* client) {
   DCHECK(client);
   // Make sure we don't call init more than once.
   DCHECK_EQ(0, stream_id_);
 
@@ skipping 16 matching lines @@
 
   ChildProcess::current()->io_message_loop()->PostTask(
       FROM_HERE,
       base::Bind(&PepperPlatformAudioOutputImpl::InitializeOnIOThread,
                  this, params));
   return true;
 }
 
 void PepperPlatformAudioOutputImpl::InitializeOnIOThread(
     const media::AudioParameters& params) {
-  stream_id_ = filter_->AddDelegate(this);
-  filter_->Send(new AudioHostMsg_CreateStream(stream_id_, params));
+  stream_id_ = ipc_->AddDelegate(this);
+  ipc_->CreateStream(stream_id_, params);
 }
 
 void PepperPlatformAudioOutputImpl::StartPlaybackOnIOThread() {
   if (stream_id_)
-    filter_->Send(new AudioHostMsg_PlayStream(stream_id_));
+    ipc_->PlayStream(stream_id_);
 }
 
 void PepperPlatformAudioOutputImpl::StopPlaybackOnIOThread() {
   if (stream_id_)
-    filter_->Send(new AudioHostMsg_PauseStream(stream_id_));
+    ipc_->PauseStream(stream_id_);
 }
 
 void PepperPlatformAudioOutputImpl::ShutDownOnIOThread() {
   // Make sure we don't call shutdown more than once.
   if (!stream_id_)
     return;
 
-  filter_->Send(new AudioHostMsg_CloseStream(stream_id_));
-  filter_->RemoveDelegate(stream_id_);
+  ipc_->CloseStream(stream_id_);
+  ipc_->RemoveDelegate(stream_id_);
   stream_id_ = 0;
 
   Release();  // Release for the delegate, balances out the reference taken in
               // PepperPluginDelegateImpl::CreateAudio.
 }
 
 }  // namespace content