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 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 "HRTFDatabaseLoader.h"
34
35#include "HRTFDatabase.h"
36#include <wtf/HashMap.h>
37#include <wtf/MainThread.h>
38#include <wtf/NeverDestroyed.h>
39
40namespace WebCore {
41
42// Keeps track of loaders on a per-sample-rate basis.
43static HashMap<double, HRTFDatabaseLoader*>& loaderMap()
44{
45 static NeverDestroyed<HashMap<double, HRTFDatabaseLoader*>> loaderMap;
46 return loaderMap;
47}
48
49Ref<HRTFDatabaseLoader> HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(float sampleRate)
50{
51 ASSERT(isMainThread());
52
53 if (RefPtr<HRTFDatabaseLoader> loader = loaderMap().get(sampleRate)) {
54 ASSERT(sampleRate == loader->databaseSampleRate());
55 return loader.releaseNonNull();
56 }
57
58 auto loader = adoptRef(*new HRTFDatabaseLoader(sampleRate));
59 loaderMap().add(sampleRate, loader.ptr());
60
61 loader->loadAsynchronously();
62
63 return loader;
64}
65
66HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate)
67 : m_databaseSampleRate(sampleRate)
68{
69 ASSERT(isMainThread());
70}
71
72HRTFDatabaseLoader::~HRTFDatabaseLoader()
73{
74 ASSERT(isMainThread());
75
76 waitForLoaderThreadCompletion();
77 m_hrtfDatabase = nullptr;
78
79 // Remove ourself from the map.
80 loaderMap().remove(m_databaseSampleRate);
81}
82
83void HRTFDatabaseLoader::load()
84{
85 ASSERT(!isMainThread());
86 if (!m_hrtfDatabase.get()) {
87 // Load the default HRTF database.
88 m_hrtfDatabase = std::make_unique<HRTFDatabase>(m_databaseSampleRate);
89 }
90}
91
92void HRTFDatabaseLoader::loadAsynchronously()
93{
94 ASSERT(isMainThread());
95
96 LockHolder locker(m_threadLock);
97
98 if (!m_hrtfDatabase.get() && !m_databaseLoaderThread) {
99 // Start the asynchronous database loading process.
100 m_databaseLoaderThread = Thread::create("HRTF database loader", [this] {
101 load();
102 });
103 }
104}
105
106bool HRTFDatabaseLoader::isLoaded() const
107{
108 return m_hrtfDatabase.get();
109}
110
111void HRTFDatabaseLoader::waitForLoaderThreadCompletion()
112{
113 LockHolder locker(m_threadLock);
114
115 // waitForThreadCompletion() should not be called twice for the same thread.
116 if (m_databaseLoaderThread)
117 m_databaseLoaderThread->waitForCompletion();
118 m_databaseLoaderThread = nullptr;
119}
120
121} // namespace WebCore
122
123#endif // ENABLE(WEB_AUDIO)
124