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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 "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