move VideoCaptureImplManager from singleton to a member of RenderThread.

fix some comments.
BUG=none
TEST=try bots

Review URL: http://codereview.chromium.org/7265004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@90605 0039d316-1c4b-4281-b951-d872f2087c98

6 files changed, 60 insertions, 123 deletions

diff --git a/content/renderer/media/video_capture_impl_manager.cc b/content/renderer/media/video_capture_impl_manager.cc
index 62b3915..558d28d 100644
--- a/content/renderer/media/video_capture_impl_manager.cc
+++ b/content/renderer/media/video_capture_impl_manager.cc
@@ -4,74 +4,67 @@
 
 #include "content/renderer/media/video_capture_impl_manager.h"
 
-#include "base/memory/singleton.h"
-#include "content/renderer/media/video_capture_message_filter_creator.h"
-#include "media/base/message_loop_factory_impl.h"
-
-VideoCaptureImplManager::VideoCaptureImplManager() {
-  ml_factory_.reset(new media::MessageLoopFactoryImpl());
-  ml_proxy_ = ml_factory_->GetMessageLoopProxy("VC manager");
+#include "base/stl_util-inl.h"
+#include "content/renderer/media/video_capture_impl.h"
+#include "content/renderer/media/video_capture_message_filter.h"
+
+VideoCaptureImplManager::VideoCaptureImplManager()
+    : thread_("VC manager") {
+  thread_.Start();
+  message_loop_proxy_ = thread_.message_loop_proxy();
+  filter_ = new VideoCaptureMessageFilter();
 }
 
-VideoCaptureImplManager::~VideoCaptureImplManager() {}
+VideoCaptureImplManager::~VideoCaptureImplManager() {
+  STLDeleteContainerPairSecondPointers(devices_.begin(), devices_.end());
+  thread_.Stop();
+}
 
-// static
 media::VideoCapture* VideoCaptureImplManager::AddDevice(
     media::VideoCaptureSessionId id,
     media::VideoCapture::EventHandler* handler) {
   DCHECK(handler);
-  VideoCaptureImplManager* manager = GetInstance();
 
-  base::AutoLock auto_lock(manager->lock_);
-  Devices::iterator it = manager->devices_.find(id);
-  if (it == manager->devices_.end()) {
+  base::AutoLock auto_lock(lock_);
+  Devices::iterator it = devices_.find(id);
+  if (it == devices_.end()) {
     VideoCaptureImpl* vc =
-        new VideoCaptureImpl(id, manager->ml_proxy_,
-                             VideoCaptureMessageFilterCreator::SharedFilter());
-    manager->devices_[id] = Device(vc, handler);
+        new VideoCaptureImpl(id, message_loop_proxy_, filter_);
+    devices_[id] = new Device(vc, handler);
     vc->Init();
     return vc;
   }
 
-  manager->devices_[id].clients.push_front(handler);
-  return it->second.vc;
+  devices_[id]->clients.push_front(handler);
+  return it->second->vc;
 }
 
-// static
 void VideoCaptureImplManager::RemoveDevice(
     media::VideoCaptureSessionId id,
     media::VideoCapture::EventHandler* handler) {
   DCHECK(handler);
-  VideoCaptureImplManager* manager = GetInstance();
 
-  base::AutoLock auto_lock(manager->lock_);
-  Devices::iterator it = manager->devices_.find(id);
-  if (it == manager->devices_.end())
+  base::AutoLock auto_lock(lock_);
+  Devices::iterator it = devices_.find(id);
+  if (it == devices_.end())
     return;
 
-  size_t size = it->second.clients.size();
-  it->second.clients.remove(handler);
+  size_t size = it->second->clients.size();
+  it->second->clients.remove(handler);
 
-  if (size == it->second.clients.size() || size > 1)
+  if (size == it->second->clients.size() || size > 1)
     return;
 
-  manager->devices_[id].vc->DeInit(NewRunnableMethod(manager,
-      &VideoCaptureImplManager::FreeDevice, manager->devices_[id].vc));
-  manager->devices_.erase(id);
-  return;
-}
-
-// static
-VideoCaptureImplManager* VideoCaptureImplManager::GetInstance() {
-  return Singleton<VideoCaptureImplManager>::get();
+  devices_[id]->vc->DeInit(NewRunnableMethod(this,
+      &VideoCaptureImplManager::FreeDevice, devices_[id]->vc));
+  delete devices_[id];
+  devices_.erase(id);
 }
 
 void VideoCaptureImplManager::FreeDevice(VideoCaptureImpl* vc) {
   delete vc;
 }
 
-VideoCaptureImplManager::Device::Device() : vc(NULL) {}
-
 VideoCaptureImplManager::Device::Device(
     VideoCaptureImpl* device,
     media::VideoCapture::EventHandler* handler)
@@ -80,4 +73,3 @@ VideoCaptureImplManager::Device::Device(
 }
 
 VideoCaptureImplManager::Device::~Device() {}
-
diff --git a/content/renderer/media/video_capture_impl_manager.h b/content/renderer/media/video_capture_impl_manager.h
index c562740..28c0e42 100644
--- a/content/renderer/media/video_capture_impl_manager.h
+++ b/content/renderer/media/video_capture_impl_manager.h
@@ -13,37 +13,39 @@
 #include <list>
 #include <map>
 
+#include "base/threading/thread.h"
 #include "base/message_loop_proxy.h"
 #include "base/synchronization/lock.h"
-#include "content/renderer/media/video_capture_impl.h"
-#include "content/renderer/media/video_capture_message_filter.h"
-#include "media/base/callback.h"
-#include "media/base/message_loop_factory.h"
 #include "media/video/capture/video_capture.h"
 
-class VideoCaptureImplManager {
+class VideoCaptureImpl;
+class VideoCaptureMessageFilter;
+
+class VideoCaptureImplManager
+    : public base::RefCountedThreadSafe<VideoCaptureImplManager> {
  public:
   VideoCaptureImplManager();
-  ~VideoCaptureImplManager();
+  virtual ~VideoCaptureImplManager();
 
   // Called by video capture client |handler| to add device referenced
   // by |id| to VideoCaptureImplManager's list of opened device list.
   // A pointer to VideoCapture is returned to client so that client can
   // operate on that pointer, such as StartCaptrue, StopCapture.
-  static media::VideoCapture* AddDevice(
+  media::VideoCapture* AddDevice(
       media::VideoCaptureSessionId id,
       media::VideoCapture::EventHandler* handler);
 
   // Called by video capture client |handler| to remove device referenced
   // by |id| from VideoCaptureImplManager's list of opened device list.
-  static void RemoveDevice(media::VideoCaptureSessionId id,
-                           media::VideoCapture::EventHandler* handler);
+  void RemoveDevice(media::VideoCaptureSessionId id,
+                    media::VideoCapture::EventHandler* handler);
 
-  static VideoCaptureImplManager* GetInstance();
+  VideoCaptureMessageFilter* video_capture_message_filter() const {
+    return filter_;
+  }
 
  private:
   struct Device {
-    Device();
     Device(VideoCaptureImpl* device,
            media::VideoCapture::EventHandler* handler);
     ~Device();
@@ -54,15 +56,14 @@ class VideoCaptureImplManager {
 
   void FreeDevice(VideoCaptureImpl* vc);
 
-  typedef std::map<media::VideoCaptureSessionId, Device> Devices;
+  typedef std::map<media::VideoCaptureSessionId, Device*> Devices;
   Devices devices_;
   base::Lock lock_;
-  scoped_refptr<base::MessageLoopProxy> ml_proxy_;
-  scoped_ptr<media::MessageLoopFactory> ml_factory_;
+  scoped_refptr<VideoCaptureMessageFilter> filter_;
+  base::Thread thread_;
+  scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureImplManager);
 };
 
-DISABLE_RUNNABLE_METHOD_REFCOUNT(VideoCaptureImplManager);
-
 #endif  // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_IMPL_MANAGER_H_
diff --git a/content/renderer/media/video_capture_message_filter_creator.cc b/content/renderer/media/video_capture_message_filter_creator.cc
deleted file mode 100644
index b166f80..0000000
--- a/content/renderer/media/video_capture_message_filter_creator.cc
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright (c) 2011 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/media/video_capture_message_filter_creator.h"
-
-#include "content/renderer/media/video_capture_message_filter.h"
-
-VideoCaptureMessageFilterCreator::VideoCaptureMessageFilterCreator() {
-  filter_ = new VideoCaptureMessageFilter();
-}
-
-VideoCaptureMessageFilterCreator::~VideoCaptureMessageFilterCreator() {
-}
-
-// static
-VideoCaptureMessageFilter* VideoCaptureMessageFilterCreator::SharedFilter() {
-  return GetInstance()->filter_.get();
-}
-
-// static
-VideoCaptureMessageFilterCreator*
-    VideoCaptureMessageFilterCreator::GetInstance() {
-      return Singleton<VideoCaptureMessageFilterCreator>::get();
-}
-
diff --git a/content/renderer/media/video_capture_message_filter_creator.h b/content/renderer/media/video_capture_message_filter_creator.h
deleted file mode 100644
index 1424408..0000000
--- a/content/renderer/media/video_capture_message_filter_creator.h
+++ /dev/null
@@ -1,35 +0,0 @@
-// Copyright (c) 2011 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 CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_MESSAGE_FILTER_CREATOR_H_
-#define CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_MESSAGE_FILTER_CREATOR_H_
-
-#include "base/memory/ref_counted.h"
-#include "base/memory/singleton.h"
-
-class VideoCaptureMessageFilter;
-
-// VideoCaptureMessageFilterCreator is to be used as a singleton so we can get
-// access to a shared VideoCaptureMessageFilter.
-// Example usage:
-//   VideoCaptureMessageFilter* filter =
-//       VideoCaptureMessageFilterCreator::SharedFilter();
-
-class VideoCaptureMessageFilterCreator {
- public:
-  static VideoCaptureMessageFilter* SharedFilter();
-  static VideoCaptureMessageFilterCreator* GetInstance();
-
- private:
-  VideoCaptureMessageFilterCreator();
-  ~VideoCaptureMessageFilterCreator();
-  friend struct DefaultSingletonTraits<VideoCaptureMessageFilterCreator>;
-
-  scoped_refptr<VideoCaptureMessageFilter> filter_;
-
-  DISALLOW_COPY_AND_ASSIGN(VideoCaptureMessageFilterCreator);
-};
-
-#endif  // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_MESSAGE_FILTER_CREATOR_H_
-
diff --git a/content/renderer/render_thread.cc b/content/renderer/render_thread.cc
index 89f95d1..4dcc99b 100644
--- a/content/renderer/render_thread.cc
+++ b/content/renderer/render_thread.cc
@@ -37,8 +37,8 @@
 #include "content/renderer/gpu/gpu_channel_host.h"
 #include "content/renderer/gpu/gpu_video_service_host.h"
 #include "content/renderer/indexed_db_dispatcher.h"
+#include "content/renderer/media/video_capture_impl_manager.h"
 #include "content/renderer/media/video_capture_message_filter.h"
-#include "content/renderer/media/video_capture_message_filter_creator.h"
 #include "content/renderer/plugin_channel_host.h"
 #include "content/renderer/render_process_impl.h"
 #include "content/renderer/render_process_observer.h"
@@ -171,9 +171,8 @@ void RenderThread::Init() {
   db_message_filter_ = new DBMessageFilter();
   AddFilter(db_message_filter_.get());
 
-  VideoCaptureMessageFilter* video_capture_message_filter =
-      VideoCaptureMessageFilterCreator::SharedFilter();
-  AddFilter(video_capture_message_filter);
+  vc_manager_ = new VideoCaptureImplManager();
+  AddFilter(vc_manager_->video_capture_message_filter());
 
   content::GetContentClient()->renderer()->RenderThreadStarted();
 
@@ -189,13 +188,11 @@ RenderThread::~RenderThread() {
     web_database_observer_impl_->WaitForAllDatabasesToClose();
 
   // Shutdown in reverse of the initialization order.
+  RemoveFilter(vc_manager_->video_capture_message_filter());
+
   RemoveFilter(db_message_filter_.get());
   db_message_filter_ = NULL;
 
-  VideoCaptureMessageFilter* video_capture_message_filter =
-      VideoCaptureMessageFilterCreator::SharedFilter();
-  RemoveFilter(video_capture_message_filter);
-
   // Shutdown the file thread if it's running.
   if (file_thread_.get())
     file_thread_->Stop();
diff --git a/content/renderer/render_thread.h b/content/renderer/render_thread.h
index 853fffe..e73d1c1 100644
--- a/content/renderer/render_thread.h
+++ b/content/renderer/render_thread.h
@@ -32,6 +32,7 @@ class RenderProcessObserver;
 class RendererNetPredictor;
 class RendererWebKitClientImpl;
 class SkBitmap;
+class VideoCaptureImplManager;
 class WebDatabaseObserverImpl;
 
 struct RendererPreferences;
@@ -164,6 +165,10 @@ class RenderThread : public RenderThreadBase,
     return indexed_db_dispatcher_.get();
   }
 
+  VideoCaptureImplManager* video_capture_impl_manager() const {
+    return vc_manager_.get();
+  }
+
   bool plugin_refresh_allowed() const { return plugin_refresh_allowed_; }
 
   double idle_notification_delay_in_s() const {
@@ -247,6 +252,9 @@ class RenderThread : public RenderThreadBase,
   // Used on the renderer and IPC threads.
   scoped_refptr<DBMessageFilter> db_message_filter_;
 
+  // Used on multiple threads.
+  scoped_refptr<VideoCaptureImplManager> vc_manager_;
+
   // Used on multiple script execution context threads.
   scoped_ptr<WebDatabaseObserverImpl> web_database_observer_impl_;