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 #include "config.h" 30 31 #if ENABLE(WEB_AUDIO) 32 33 #include "platform/audio/HRTFDatabaseLoader.h" 34 35 #include "platform/Task.h" 36 #include "platform/TaskSynchronizer.h" 37 #include "public/platform/Platform.h" 38 #include "wtf/MainThread.h" 39 40 namespace blink { 41 42 typedef HeapHashMap<double, WeakMember<HRTFDatabaseLoader> > LoaderMap; 43 44 static LoaderMap& loaderMap() 45 { 46 DEFINE_STATIC_LOCAL(Persistent<LoaderMap>, map, (new LoaderMap)); 47 return *map; 48 } 49 50 HRTFDatabaseLoader* HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(float sampleRate) 51 { 52 ASSERT(isMainThread()); 53 54 HRTFDatabaseLoader* loader = loaderMap().get(sampleRate); 55 if (loader) { 56 ASSERT(sampleRate == loader->databaseSampleRate()); 57 return loader; 58 } 59 60 loader = new HRTFDatabaseLoader(sampleRate); 61 loaderMap().add(sampleRate, loader); 62 loader->loadAsynchronously(); 63 return loader; 64 } 65 66 HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate) 67 : m_databaseSampleRate(sampleRate) 68 { 69 ASSERT(isMainThread()); 70 } 71 72 HRTFDatabaseLoader::~HRTFDatabaseLoader() 73 { 74 ASSERT(isMainThread()); 75 ASSERT(!m_thread); 76 } 77 78 void HRTFDatabaseLoader::loadTask() 79 { 80 ASSERT(!isMainThread()); 81 m_thread->attachGC(); 82 83 { 84 MutexLocker locker(m_lock); 85 if (!m_hrtfDatabase) { 86 // Load the default HRTF database. 87 m_hrtfDatabase = HRTFDatabase::create(m_databaseSampleRate); 88 } 89 } 90 91 m_thread->detachGC(); 92 } 93 94 void HRTFDatabaseLoader::loadAsynchronously() 95 { 96 ASSERT(isMainThread()); 97 98 MutexLocker locker(m_lock); 99 if (!m_hrtfDatabase && !m_thread) { 100 // Start the asynchronous database loading process. 101 m_thread = WebThreadSupportingGC::create("HRTF database loader"); 102 m_thread->postTask(new Task(WTF::bind(&HRTFDatabaseLoader::loadTask, this))); 103 } 104 } 105 106 bool HRTFDatabaseLoader::isLoaded() 107 { 108 MutexLocker locker(m_lock); 109 return m_hrtfDatabase; 110 } 111 112 // This cleanup task is needed just to make sure that the loader thread finishes 113 // the load task and thus the loader thread doesn't touch m_thread any more. 114 void HRTFDatabaseLoader::cleanupTask(TaskSynchronizer* sync) 115 { 116 sync->taskCompleted(); 117 } 118 119 void HRTFDatabaseLoader::waitForLoaderThreadCompletion() 120 { 121 if (!m_thread) 122 return; 123 124 TaskSynchronizer sync; 125 m_thread->postTask(new Task(WTF::bind(&HRTFDatabaseLoader::cleanupTask, this, &sync))); 126 sync.waitForTaskCompletion(); 127 m_thread.clear(); 128 } 129 130 } // namespace blink 131 132 #endif // ENABLE(WEB_AUDIO) 133