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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 
loaderMap()44 static LoaderMap& loaderMap()
45 {
46     DEFINE_STATIC_LOCAL(Persistent<LoaderMap>, map, (new LoaderMap));
47     return *map;
48 }
49 
createAndLoadAsynchronouslyIfNecessary(float sampleRate)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 
HRTFDatabaseLoader(float sampleRate)66 HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate)
67     : m_databaseSampleRate(sampleRate)
68 {
69     ASSERT(isMainThread());
70 }
71 
~HRTFDatabaseLoader()72 HRTFDatabaseLoader::~HRTFDatabaseLoader()
73 {
74     ASSERT(isMainThread());
75     ASSERT(!m_thread);
76 }
77 
loadTask()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 
loadAsynchronously()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 
isLoaded()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.
cleanupTask(TaskSynchronizer * sync)114 void HRTFDatabaseLoader::cleanupTask(TaskSynchronizer* sync)
115 {
116     sync->taskCompleted();
117 }
118 
waitForLoaderThreadCompletion()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