1/* 2 * Copyright (C) 2010 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#ifndef HRTFDatabaseLoader_h 30#define HRTFDatabaseLoader_h 31 32#include "HRTFDatabase.h" 33#include <memory> 34#include <wtf/HashMap.h> 35#include <wtf/PassRefPtr.h> 36#include <wtf/RefCounted.h> 37#include <wtf/RefPtr.h> 38#include <wtf/Threading.h> 39 40namespace WebCore { 41 42// HRTFDatabaseLoader will asynchronously load the default HRTFDatabase in a new thread. 43 44class HRTFDatabaseLoader : public RefCounted<HRTFDatabaseLoader> { 45public: 46 // Lazily creates a HRTFDatabaseLoader (if not already created) for the given sample-rate 47 // and starts loading asynchronously (when created the first time). 48 // Returns the HRTFDatabaseLoader. 49 // Must be called from the main thread. 50 static PassRefPtr<HRTFDatabaseLoader> createAndLoadAsynchronouslyIfNecessary(float sampleRate); 51 52 // Both constructor and destructor must be called from the main thread. 53 ~HRTFDatabaseLoader(); 54 55 // Returns true once the default database has been completely loaded. 56 bool isLoaded() const; 57 58 // waitForLoaderThreadCompletion() may be called more than once and is thread-safe. 59 void waitForLoaderThreadCompletion(); 60 61 HRTFDatabase* database() { return m_hrtfDatabase.get(); } 62 63 float databaseSampleRate() const { return m_databaseSampleRate; } 64 65 // Called in asynchronous loading thread. 66 void load(); 67 68private: 69 // Both constructor and destructor must be called from the main thread. 70 explicit HRTFDatabaseLoader(float sampleRate); 71 72 // If it hasn't already been loaded, creates a new thread and initiates asynchronous loading of the default database. 73 // This must be called from the main thread. 74 void loadAsynchronously(); 75 76 std::unique_ptr<HRTFDatabase> m_hrtfDatabase; 77 78 // Holding a m_threadLock is required when accessing m_databaseLoaderThread. 79 Mutex m_threadLock; 80 ThreadIdentifier m_databaseLoaderThread; 81 82 float m_databaseSampleRate; 83}; 84 85} // namespace WebCore 86 87#endif // HRTFDatabaseLoader_h 88