Add MediaInternals data aggregator.

BUG=none
TEST=tests pass


Review URL: http://codereview.chromium.org/7111061

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@90431 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 63 insertions, 0 deletions

diff --git a/chrome/browser/media/media_internals.h b/chrome/browser/media/media_internals.h
new file mode 100644
index 0000000..d3fad63
--- /dev/null
+++ b/chrome/browser/media/media_internals.h
@@ -0,0 +1,63 @@
+// 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 CHROME_BROWSER_MEDIA_MEDIA_INTERNALS_H_
+#define CHROME_BROWSER_MEDIA_MEDIA_INTERNALS_H_
+#pragma once
+
+#include "base/memory/ref_counted.h"
+#include "base/observer_list_threadsafe.h"
+#include "base/values.h"
+#include "content/browser/renderer_host/media/media_observer.h"
+
+class MediaInternalsObserver;
+
+// This class stores information about currently active media.
+class MediaInternals : public MediaObserver {
+ public:
+  virtual ~MediaInternals();
+
+  // MediaObserver implementation. These are callable from any thread:
+  virtual void OnSetAudioStreamPlaying(void* host, int32 render_view,
+                                       int stream_id, bool playing);
+  virtual void OnSetAudioStreamVolume(void* host, int32 render_view,
+                                      int stream_id, double volume);
+
+  // Methods for observers. Called from the observer's own thread:
+  // UIs should add themselves on construction and remove themselves
+  // on destruction.
+  void AddUI(MediaInternalsObserver* ui);
+  void RemoveUI(MediaInternalsObserver* ui);
+  void SendEverything();
+
+ private:
+  friend class IOThread;
+  friend class MediaInternalsTest;
+
+  MediaInternals();
+
+  // Sets |property| of an audio stream to |value| and notifies observers.
+  // (host, render_view, stream_id) is a unique id for the audio stream.
+  // |host| will never be dereferenced.
+  void UpdateAudioStream(void* host, int32 render_view, int stream_id,
+                         const std::string& property, Value* value);
+
+  // Sets data_.id.property = value and notifies attached UIs using update_fn.
+  // id may be any depth, e.g. "video.decoders.1.2.3"
+  void UpdateItemOnIOThread(const std::string& update_fn, const std::string& id,
+                            const std::string& property, Value* value);
+
+  // Calls javascript |function|(|value|) on each attached UI.
+  void SendUpdateOnIOThread(const std::string& function, Value* value);
+
+  static MediaInternals* instance_;
+  DictionaryValue data_;
+  scoped_refptr<ObserverListThreadSafe<MediaInternalsObserver> > observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaInternals);
+};
+
+DISABLE_RUNNABLE_METHOD_REFCOUNT(MediaInternals);
+
+#endif  // CHROME_BROWSER_MEDIA_MEDIA_INTERNALS_H_