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
createAndLoadAsynchronouslyIfNecessary(float sampleRate)44 PassRefPtr<HRTFDatabaseLoader> HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(float sampleRate)
45 {
46 ASSERT(isMainThread());
47
48 if (!s_loaderMap)
49 s_loaderMap = adoptPtr(new LoaderMap()).leakPtr();
50
51 RefPtr<HRTFDatabaseLoader> loader = s_loaderMap->get(sampleRate);
52 if (loader) {
53 ASSERT(sampleRate == loader->databaseSampleRate());
54 return loader;
55 }
56
57 loader = adoptRef(new HRTFDatabaseLoader(sampleRate));
58 s_loaderMap->add(sampleRate, loader.get());
59
60 loader->loadAsynchronously();
61
62 return loader;
63 }
64
HRTFDatabaseLoader(float sampleRate)65 HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate)
66 : m_databaseSampleRate(sampleRate)
67 {
68 ASSERT(isMainThread());
69 }
70
~HRTFDatabaseLoader()71 HRTFDatabaseLoader::~HRTFDatabaseLoader()
72 {
73 ASSERT(isMainThread());
74
75 waitForLoaderThreadCompletion();
76 m_hrtfDatabase.clear();
77
78 // Remove ourself from the map.
79 if (s_loaderMap)
80 s_loaderMap->remove(m_databaseSampleRate);
81 }
82
load()83 void HRTFDatabaseLoader::load()
84 {
85 ASSERT(!isMainThread());
86 if (!m_hrtfDatabase) {
87 // Load the default HRTF database.
88 m_hrtfDatabase = HRTFDatabase::create(m_databaseSampleRate);
89 }
90 }
91
loadAsynchronously()92 void HRTFDatabaseLoader::loadAsynchronously()
93 {
94 ASSERT(isMainThread());
95
96 MutexLocker locker(m_threadLock);
97
98 if (!m_hrtfDatabase && !m_databaseLoaderThread) {
99 // Start the asynchronous database loading process.
100 m_databaseLoaderThread = adoptPtr(blink::Platform::current()->createThread("HRTF database loader"));
101 m_databaseLoaderThread->postTask(new Task(WTF::bind(&HRTFDatabaseLoader::load, this)));
102 }
103 }
104
isLoaded() const105 bool HRTFDatabaseLoader::isLoaded() const
106 {
107 return m_hrtfDatabase;
108 }
109
waitForLoaderThreadCompletion()110 void HRTFDatabaseLoader::waitForLoaderThreadCompletion()
111 {
112 MutexLocker locker(m_threadLock);
113 m_databaseLoaderThread.clear();
114 }
115
116 } // namespace WebCore
117
118 #endif // ENABLE(WEB_AUDIO)
119