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// 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.
#ifndef CHROME_BROWSER_MEDIA_MEDIA_INTERNALS_H_
#define CHROME_BROWSER_MEDIA_MEDIA_INTERNALS_H_
#pragma once
#include "base/memory/ref_counted.h"
#include "base/memory/singleton.h"
#include "base/observer_list.h"
#include "base/values.h"
#include "content/public/browser/media_observer.h"
class MediaInternalsObserver;
namespace media {
struct MediaLogEvent;
}
// This class stores information about currently active media.
// It's constructed on the UI thread but all of its methods are called on the IO
// thread.
class MediaInternals : public content::MediaObserver {
public:
virtual ~MediaInternals();
static MediaInternals* GetInstance();
// Overridden from content::MediaObserver:
virtual void OnDeleteAudioStream(void* host, int stream_id) OVERRIDE;
virtual void OnSetAudioStreamPlaying(void* host,
int stream_id,
bool playing) OVERRIDE;
virtual void OnSetAudioStreamStatus(void* host,
int stream_id,
const std::string& status) OVERRIDE;
virtual void OnSetAudioStreamVolume(void* host,
int stream_id,
double volume) OVERRIDE;
virtual void OnMediaEvent(int render_process_id,
const media::MediaLogEvent& event) OVERRIDE;
// Methods for observers.
// Observers should add themselves on construction and remove themselves
// on destruction.
void AddObserver(MediaInternalsObserver* observer);
void RemoveObserver(MediaInternalsObserver* observer);
void SendEverything();
private:
friend class MediaInternalsTest;
friend struct DefaultSingletonTraits<MediaInternals>;
MediaInternals();
// Sets |property| of an audio stream to |value| and notifies observers.
// (host, stream_id) is a unique id for the audio stream.
// |host| will never be dereferenced.
void UpdateAudioStream(void* host, int stream_id,
const std::string& property, Value* value);
// Removes |item| from |data_|.
void DeleteItem(const std::string& item);
// 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 UpdateItem(const std::string& update_fn, const std::string& id,
const std::string& property, Value* value);
// Calls javascript |function|(|value|) on each attached UI.
void SendUpdate(const std::string& function, Value* value);
static MediaInternals* instance_;
DictionaryValue data_;
ObserverList<MediaInternalsObserver> observers_;
DISALLOW_COPY_AND_ASSIGN(MediaInternals);
};
#endif // CHROME_BROWSER_MEDIA_MEDIA_INTERNALS_H_
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