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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 CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_H_
#define CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_H_
#include <string>
#include <vector>
#include "base/callback_forward.h"
#include "base/compiler_specific.h"
#include "base/lazy_instance.h"
#include "base/strings/string16.h"
#include "base/synchronization/lock.h"
#include "base/values.h"
#include "content/common/content_export.h"
#include "media/audio/audio_logging.h"
namespace media {
class AudioParameters;
struct MediaLogEvent;
}
namespace content {
// This class stores information about currently active media.
class CONTENT_EXPORT MediaInternals
: NON_EXPORTED_BASE(public media::AudioLogFactory) {
public:
static MediaInternals* GetInstance();
virtual ~MediaInternals();
// Called when a MediaEvent occurs.
void OnMediaEvents(int render_process_id,
const std::vector<media::MediaLogEvent>& events);
// Called with the update string.
typedef base::Callback<void(const string16&)> UpdateCallback;
// Add/remove update callbacks (see above). Must be called on the IO thread.
void AddUpdateCallback(const UpdateCallback& callback);
void RemoveUpdateCallback(const UpdateCallback& callback);
// Sends all cached data to each registered UpdateCallback.
void SendEverything();
// AudioLogFactory implementation. Safe to call from any thread.
virtual scoped_ptr<media::AudioLog> CreateAudioLog(
AudioComponent component) OVERRIDE;
private:
friend class AudioLogImpl;
friend class MediaInternalsTest;
friend struct base::DefaultLazyInstanceTraits<MediaInternals>;
MediaInternals();
// Sends |update| to each registered UpdateCallback. Safe to call from any
// thread, but will forward to the IO thread.
void SendUpdate(const string16& update);
// Caches |value| under |cache_key| so that future SendEverything() calls will
// include the current data. Calls JavaScript |function|(|value|) for each
// registered UpdateCallback. SendUpdateAndPurgeCache() is similar but purges
// the cache entry after completion instead.
void SendUpdateAndCache(const std::string& cache_key,
const std::string& function,
const base::DictionaryValue* value);
void SendUpdateAndPurgeCache(const std::string& cache_key,
const std::string& function,
const base::DictionaryValue* value);
// Must only be accessed on the IO thread.
std::vector<UpdateCallback> update_callbacks_;
// All variables below must be accessed under |lock_|.
base::Lock lock_;
base::DictionaryValue cached_data_;
int owner_ids_[AUDIO_COMPONENT_MAX];
DISALLOW_COPY_AND_ASSIGN(MediaInternals);
};
} // namespace content
#endif // CONTENT_BROWSER_MEDIA_MEDIA_INTERNALS_H_
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