/*
* Copyright (C) 2010 Google Inc. All rights reserved.
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#ifndef HRTFDatabaseLoader_h
#define HRTFDatabaseLoader_h
#include "platform/audio/HRTFDatabase.h"
#include "public/platform/WebThread.h"
#include "wtf/HashMap.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/ThreadingPrimitives.h"
namespace WebCore {
// HRTFDatabaseLoader will asynchronously load the default HRTFDatabase in a new thread.
class PLATFORM_EXPORT HRTFDatabaseLoader : public RefCounted<HRTFDatabaseLoader> {
public:
// Lazily creates a HRTFDatabaseLoader (if not already created) for the given sample-rate
// and starts loading asynchronously (when created the first time).
// Returns the HRTFDatabaseLoader.
// Must be called from the main thread.
static PassRefPtr<HRTFDatabaseLoader> createAndLoadAsynchronouslyIfNecessary(float sampleRate);
// Both constructor and destructor must be called from the main thread.
~HRTFDatabaseLoader();
// Returns true once the default database has been completely loaded.
bool isLoaded() const;
// waitForLoaderThreadCompletion() may be called more than once and is thread-safe.
void waitForLoaderThreadCompletion();
HRTFDatabase* database() { return m_hrtfDatabase.get(); }
float databaseSampleRate() const { return m_databaseSampleRate; }
// Called in asynchronous loading thread.
void load();
private:
// Both constructor and destructor must be called from the main thread.
explicit HRTFDatabaseLoader(float sampleRate);
// If it hasn't already been loaded, creates a new thread and initiates asynchronous loading of the default database.
// This must be called from the main thread.
void loadAsynchronously();
// Map from sample-rate to loader.
typedef HashMap<double, HRTFDatabaseLoader*> LoaderMap;
// Keeps track of loaders on a per-sample-rate basis.
static LoaderMap* s_loaderMap; // singleton
OwnPtr<HRTFDatabase> m_hrtfDatabase;
// Holding a m_threadLock is required when accessing m_databaseLoaderThread since we access it from multiple threads.
Mutex m_threadLock;
OwnPtr<blink::WebThread> m_databaseLoaderThread;
float m_databaseSampleRate;
};
} // namespace WebCore
#endif // HRTFDatabaseLoader_h