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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 "platform/audio/HRTFDatabaseLoader.h"
     34 
     35 #include "platform/Task.h"
     36 #include "public/platform/Platform.h"
     37 #include "wtf/MainThread.h"
     38 
     39 namespace WebCore {
     40 
     41 // Singleton
     42 HRTFDatabaseLoader::LoaderMap* HRTFDatabaseLoader::s_loaderMap = 0;
     43 
     44 PassRefPtr<HRTFDatabaseLoader> HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(float sampleRate)
     45 {
     46     ASSERT(isMainThread());
     47 
     48     RefPtr<HRTFDatabaseLoader> loader;
     49 
     50     if (!s_loaderMap)
     51         s_loaderMap = adoptPtr(new LoaderMap()).leakPtr();
     52 
     53     loader = s_loaderMap->get(sampleRate);
     54     if (loader) {
     55         ASSERT(sampleRate == loader->databaseSampleRate());
     56         return loader;
     57     }
     58 
     59     loader = adoptRef(new HRTFDatabaseLoader(sampleRate));
     60     s_loaderMap->add(sampleRate, loader.get());
     61 
     62     loader->loadAsynchronously();
     63 
     64     return loader;
     65 }
     66 
     67 HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate)
     68     : m_databaseSampleRate(sampleRate)
     69 {
     70     ASSERT(isMainThread());
     71 }
     72 
     73 HRTFDatabaseLoader::~HRTFDatabaseLoader()
     74 {
     75     ASSERT(isMainThread());
     76 
     77     waitForLoaderThreadCompletion();
     78     m_hrtfDatabase.clear();
     79 
     80     // Remove ourself from the map.
     81     if (s_loaderMap)
     82         s_loaderMap->remove(m_databaseSampleRate);
     83 }
     84 
     85 void HRTFDatabaseLoader::load()
     86 {
     87     ASSERT(!isMainThread());
     88     if (!m_hrtfDatabase) {
     89         // Load the default HRTF database.
     90         m_hrtfDatabase = HRTFDatabase::create(m_databaseSampleRate);
     91     }
     92 }
     93 
     94 void HRTFDatabaseLoader::loadAsynchronously()
     95 {
     96     ASSERT(isMainThread());
     97 
     98     MutexLocker locker(m_threadLock);
     99 
    100     if (!m_hrtfDatabase && !m_databaseLoaderThread) {
    101         // Start the asynchronous database loading process.
    102         m_databaseLoaderThread = adoptPtr(blink::Platform::current()->createThread("HRTF database loader"));
    103         m_databaseLoaderThread->postTask(new Task(WTF::bind(&HRTFDatabaseLoader::load, this)));
    104     }
    105 }
    106 
    107 bool HRTFDatabaseLoader::isLoaded() const
    108 {
    109     return m_hrtfDatabase;
    110 }
    111 
    112 void HRTFDatabaseLoader::waitForLoaderThreadCompletion()
    113 {
    114     MutexLocker locker(m_threadLock);
    115     m_databaseLoaderThread.clear();
    116 }
    117 
    118 } // namespace WebCore
    119 
    120 #endif // ENABLE(WEB_AUDIO)
    121