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