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      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 "HRTFDatabaseLoader.h"
     34 
     35 #include "HRTFDatabase.h"
     36 
     37 namespace WebCore {
     38 
     39 // Singleton
     40 HRTFDatabaseLoader* HRTFDatabaseLoader::s_loader = 0;
     41 
     42 PassRefPtr<HRTFDatabaseLoader> HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(double sampleRate)
     43 {
     44     ASSERT(isMainThread());
     45 
     46     RefPtr<HRTFDatabaseLoader> loader;
     47 
     48     if (!s_loader) {
     49         // Lazily create and load.
     50         loader = adoptRef(new HRTFDatabaseLoader(sampleRate));
     51         s_loader = loader.get();
     52         loader->loadAsynchronously();
     53     } else {
     54         loader = s_loader;
     55         ASSERT(sampleRate == loader->databaseSampleRate());
     56     }
     57 
     58     return loader;
     59 }
     60 
     61 HRTFDatabaseLoader::HRTFDatabaseLoader(double sampleRate)
     62     : m_hrtfDatabase(0)
     63     , m_databaseLoaderThread(0)
     64     , m_startedLoadingDatabase(false)
     65     , m_databaseSampleRate(sampleRate)
     66 {
     67     ASSERT(isMainThread());
     68 }
     69 
     70 HRTFDatabaseLoader::~HRTFDatabaseLoader()
     71 {
     72     ASSERT(isMainThread());
     73 
     74     if (m_startedLoadingDatabase)
     75         waitForThreadCompletion(m_databaseLoaderThread, 0);
     76 
     77     m_startedLoadingDatabase = false;
     78     m_databaseLoaderThread = 0;
     79 
     80     m_hrtfDatabase.clear();
     81 
     82     // Clear out singleton.
     83     ASSERT(this == s_loader);
     84     s_loader = 0;
     85 }
     86 
     87 
     88 // Asynchronously load the database in this thread.
     89 static void* databaseLoaderEntry(void* threadData)
     90 {
     91     HRTFDatabaseLoader* loader = reinterpret_cast<HRTFDatabaseLoader*>(threadData);
     92     ASSERT(loader);
     93     loader->load();
     94 
     95     return 0;
     96 }
     97 
     98 void HRTFDatabaseLoader::load()
     99 {
    100     ASSERT(!isMainThread());
    101     if (!m_hrtfDatabase.get()) {
    102         // Load the default HRTF database.
    103         m_hrtfDatabase = HRTFDatabase::create(m_databaseSampleRate);
    104     }
    105 }
    106 
    107 void HRTFDatabaseLoader::loadAsynchronously()
    108 {
    109     ASSERT(isMainThread());
    110 
    111     if (!m_hrtfDatabase.get() && !m_startedLoadingDatabase) {
    112         // Start the asynchronous database loading process.
    113         m_startedLoadingDatabase = true;
    114         m_databaseLoaderThread = createThread(databaseLoaderEntry, this, "HRTF database loader");
    115     }
    116 }
    117 
    118 bool HRTFDatabaseLoader::isLoaded() const
    119 {
    120     return m_hrtfDatabase.get();
    121 }
    122 
    123 
    124 void HRTFDatabaseLoader::waitForLoaderThreadCompletion()
    125 {
    126     ASSERT(!isMainThread());
    127     ASSERT(m_databaseLoaderThread);
    128     waitForThreadCompletion(m_databaseLoaderThread, 0);
    129 }
    130 
    131 HRTFDatabase* HRTFDatabaseLoader::defaultHRTFDatabase()
    132 {
    133     if (!s_loader)
    134         return 0;
    135 
    136     return s_loader->database();
    137 }
    138 
    139 } // namespace WebCore
    140 
    141 #endif // ENABLE(WEB_AUDIO)
    142