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 RefPtr<HRTFDatabaseLoader> loader;
49
50 if (!s_loaderMap)
51 s_loaderMap = adoptPtr(new LoaderMap()).leakPtr();
52
53 loader = s_loaderMap->get(sampleRate);
54 if (loader) {
55 ASSERT(sampleRate == loader->databaseSampleRate());
56 return loader;
57 }
58
59 loader = adoptRef(new HRTFDatabaseLoader(sampleRate));
60 s_loaderMap->add(sampleRate, loader.get());
61
62 loader->loadAsynchronously();
63
64 return loader;
65 }
66
HRTFDatabaseLoader(float sampleRate)67 HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate)
68 : m_databaseSampleRate(sampleRate)
69 {
70 ASSERT(isMainThread());
71 }
72
~HRTFDatabaseLoader()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
load()85 void HRTFDatabaseLoader::load()
86 {
87 ASSERT(!isMainThread());
88 if (!m_hrtfDatabase) {
89 // Load the default HRTF database.
90 m_hrtfDatabase = HRTFDatabase::create(m_databaseSampleRate);
91 }
92 }
93
loadAsynchronously()94 void HRTFDatabaseLoader::loadAsynchronously()
95 {
96 ASSERT(isMainThread());
97
98 MutexLocker locker(m_threadLock);
99
100 if (!m_hrtfDatabase && !m_databaseLoaderThread) {
101 // Start the asynchronous database loading process.
102 m_databaseLoaderThread = adoptPtr(blink::Platform::current()->createThread("HRTF database loader"));
103 m_databaseLoaderThread->postTask(new Task(WTF::bind(&HRTFDatabaseLoader::load, this)));
104 }
105 }
106
isLoaded() const107 bool HRTFDatabaseLoader::isLoaded() const
108 {
109 return m_hrtfDatabase;
110 }
111
waitForLoaderThreadCompletion()112 void HRTFDatabaseLoader::waitForLoaderThreadCompletion()
113 {
114 MutexLocker locker(m_threadLock);
115 m_databaseLoaderThread.clear();
116 }
117
118 } // namespace WebCore
119
120 #endif // ENABLE(WEB_AUDIO)
121