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 Computer, 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 "platform/audio/HRTFDatabase.h" 33 #include "public/platform/WebThread.h" 34 #include "wtf/HashMap.h" 35 #include "wtf/PassRefPtr.h" 36 #include "wtf/RefCounted.h" 37 #include "wtf/RefPtr.h" 38 #include "wtf/ThreadingPrimitives.h" 39 40 namespace WebCore { 41 42 // HRTFDatabaseLoader will asynchronously load the default HRTFDatabase in a new thread. 43 44 class PLATFORM_EXPORT HRTFDatabaseLoader : public RefCounted<HRTFDatabaseLoader> { 45 public: 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 database()61 HRTFDatabase* database() { return m_hrtfDatabase.get(); } 62 databaseSampleRate()63 float databaseSampleRate() const { return m_databaseSampleRate; } 64 65 // Called in asynchronous loading thread. 66 void load(); 67 68 private: 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 // Map from sample-rate to loader. 77 typedef HashMap<double, HRTFDatabaseLoader*> LoaderMap; 78 79 // Keeps track of loaders on a per-sample-rate basis. 80 static LoaderMap* s_loaderMap; // singleton 81 82 OwnPtr<HRTFDatabase> m_hrtfDatabase; 83 84 // Holding a m_threadLock is required when accessing m_databaseLoaderThread since we access it from multiple threads. 85 Mutex m_threadLock; 86 OwnPtr<blink::WebThread> m_databaseLoaderThread; 87 88 float m_databaseSampleRate; 89 }; 90 91 } // namespace WebCore 92 93 #endif // HRTFDatabaseLoader_h 94