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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef HRTFDatabaseLoader_h
#define HRTFDatabaseLoader_h
#include "platform/audio/HRTFDatabase.h"
#include "public/platform/WebThread.h"
#include "wtf/HashMap.h"
#include "wtf/RefCounted.h"
#include "wtf/ThreadingPrimitives.h"
#include <memory>
namespace blink {
class WaitableEvent;
// HRTFDatabaseLoader will asynchronously load the default HRTFDatabase in a new
// thread.
class PLATFORM_EXPORT HRTFDatabaseLoader final
: 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. This
// must be called from the audio thread.
bool isLoaded() { return database(); }
// waitForLoaderThreadCompletion() may be called more than once and is
// thread-safe.
void waitForLoaderThreadCompletion();
// Returns the database or nullptr if the database doesn't yet exist. Must
// be called from the audio thread.
HRTFDatabase* database();
float databaseSampleRate() const { return m_databaseSampleRate; }
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();
// Called in asynchronous loading thread.
void loadTask();
void cleanupTask(WaitableEvent*);
// Holding a m_lock is required when accessing m_hrtfDatabase since we access
// it from multiple threads.
Mutex m_lock;
std::unique_ptr<HRTFDatabase> m_hrtfDatabase;
std::unique_ptr<WebThread> m_thread;
float m_databaseSampleRate;
};
} // namespace blink
#endif // HRTFDatabaseLoader_h
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