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#include "config.h" 30 31#if ENABLE(WEB_AUDIO) 32 33#include "HRTFDatabaseLoader.h" 34 35#include "HRTFDatabase.h" 36#include <wtf/MainThread.h> 37#include <wtf/NeverDestroyed.h> 38 39namespace WebCore { 40 41// Keeps track of loaders on a per-sample-rate basis. 42static HashMap<double, HRTFDatabaseLoader*>& loaderMap() 43{ 44 static NeverDestroyed<HashMap<double, HRTFDatabaseLoader*>> loaderMap; 45 return loaderMap; 46} 47 48PassRefPtr<HRTFDatabaseLoader> HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(float sampleRate) 49{ 50 ASSERT(isMainThread()); 51 52 RefPtr<HRTFDatabaseLoader> loader; 53 54 loader = loaderMap().get(sampleRate); 55 if (loader) { 56 ASSERT(sampleRate == loader->databaseSampleRate()); 57 return loader; 58 } 59 60 loader = adoptRef(new HRTFDatabaseLoader(sampleRate)); 61 loaderMap().add(sampleRate, loader.get()); 62 63 loader->loadAsynchronously(); 64 65 return loader; 66} 67 68HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate) 69 : m_databaseLoaderThread(0) 70 , m_databaseSampleRate(sampleRate) 71{ 72 ASSERT(isMainThread()); 73} 74 75HRTFDatabaseLoader::~HRTFDatabaseLoader() 76{ 77 ASSERT(isMainThread()); 78 79 waitForLoaderThreadCompletion(); 80 m_hrtfDatabase = nullptr; 81 82 // Remove ourself from the map. 83 loaderMap().remove(m_databaseSampleRate); 84} 85 86// Asynchronously load the database in this thread. 87static void databaseLoaderEntry(void* threadData) 88{ 89 HRTFDatabaseLoader* loader = reinterpret_cast<HRTFDatabaseLoader*>(threadData); 90 ASSERT(loader); 91 loader->load(); 92} 93 94void HRTFDatabaseLoader::load() 95{ 96 ASSERT(!isMainThread()); 97 if (!m_hrtfDatabase.get()) { 98 // Load the default HRTF database. 99 m_hrtfDatabase = std::make_unique<HRTFDatabase>(m_databaseSampleRate); 100 } 101} 102 103void HRTFDatabaseLoader::loadAsynchronously() 104{ 105 ASSERT(isMainThread()); 106 107 MutexLocker locker(m_threadLock); 108 109 if (!m_hrtfDatabase.get() && !m_databaseLoaderThread) { 110 // Start the asynchronous database loading process. 111 m_databaseLoaderThread = createThread(databaseLoaderEntry, this, "HRTF database loader"); 112 } 113} 114 115bool HRTFDatabaseLoader::isLoaded() const 116{ 117 return m_hrtfDatabase.get(); 118} 119 120void HRTFDatabaseLoader::waitForLoaderThreadCompletion() 121{ 122 MutexLocker locker(m_threadLock); 123 124 // waitForThreadCompletion() should not be called twice for the same thread. 125 if (m_databaseLoaderThread) 126 waitForThreadCompletion(m_databaseLoaderThread); 127 m_databaseLoaderThread = 0; 128} 129 130} // namespace WebCore 131 132#endif // ENABLE(WEB_AUDIO) 133