Home | History | Annotate | Download | only in audio 
      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 "core/platform/audio/HRTFDatabaseLoader.h"
     34 
     35 #include "core/platform/audio/HRTFDatabase.h"
     36 #include "wtf/MainThread.h"
     37 
     38 namespace WebCore {
     39 
     40 // Singleton
     41 HRTFDatabaseLoader::LoaderMap* HRTFDatabaseLoader::s_loaderMap = 0;
     42 
     43 PassRefPtr<HRTFDatabaseLoader> HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(float sampleRate)
     44 {
     45     ASSERT(isMainThread());
     46 
     47     RefPtr<HRTFDatabaseLoader> loader;
     48 
     49     if (!s_loaderMap)
     50         s_loaderMap = adoptPtr(new LoaderMap()).leakPtr();
     51 
     52     loader = s_loaderMap->get(sampleRate);
     53     if (loader) {
     54         ASSERT(sampleRate == loader->databaseSampleRate());
     55         return loader;
     56     }
     57 
     58     loader = adoptRef(new HRTFDatabaseLoader(sampleRate));
     59     s_loaderMap->add(sampleRate, loader.get());
     60 
     61     loader->loadAsynchronously();
     62 
     63     return loader;
     64 }
     65 
     66 HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate)
     67     : m_databaseLoaderThread(0)
     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 // Asynchronously load the database in this thread.
     86 static void databaseLoaderEntry(void* threadData)
     87 {
     88     HRTFDatabaseLoader* loader = reinterpret_cast<HRTFDatabaseLoader*>(threadData);
     89     ASSERT(loader);
     90     loader->load();
     91 }
     92 
     93 void HRTFDatabaseLoader::load()
     94 {
     95     ASSERT(!isMainThread());
     96     if (!m_hrtfDatabase.get()) {
     97         // Load the default HRTF database.
     98         m_hrtfDatabase = HRTFDatabase::create(m_databaseSampleRate);
     99     }
    100 }
    101 
    102 void HRTFDatabaseLoader::loadAsynchronously()
    103 {
    104     ASSERT(isMainThread());
    105 
    106     MutexLocker locker(m_threadLock);
    107 
    108     if (!m_hrtfDatabase.get() && !m_databaseLoaderThread) {
    109         // Start the asynchronous database loading process.
    110         m_databaseLoaderThread = createThread(databaseLoaderEntry, this, "HRTF database loader");
    111     }
    112 }
    113 
    114 bool HRTFDatabaseLoader::isLoaded() const
    115 {
    116     return m_hrtfDatabase.get();
    117 }
    118 
    119 void HRTFDatabaseLoader::waitForLoaderThreadCompletion()
    120 {
    121     MutexLocker locker(m_threadLock);
    122 
    123     // waitForThreadCompletion() should not be called twice for the same thread.
    124     if (m_databaseLoaderThread)
    125         waitForThreadCompletion(m_databaseLoaderThread);
    126     m_databaseLoaderThread = 0;
    127 }
    128 
    129 } // namespace WebCore
    130 
    131 #endif // ENABLE(WEB_AUDIO)
    132