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/MainThread.h>
37#include <wtf/NeverDestroyed.h>
38
39namespace WebCore {
40
41// Keeps track of loaders on a per-sample-rate basis.
42static HashMap<double, HRTFDatabaseLoader*>& loaderMap()
43{
44    static NeverDestroyed<HashMap<double, HRTFDatabaseLoader*>> loaderMap;
45    return loaderMap;
46}
47
48PassRefPtr<HRTFDatabaseLoader> HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(float sampleRate)
49{
50    ASSERT(isMainThread());
51
52    RefPtr<HRTFDatabaseLoader> loader;
53
54    loader = loaderMap().get(sampleRate);
55    if (loader) {
56        ASSERT(sampleRate == loader->databaseSampleRate());
57        return loader;
58    }
59
60    loader = adoptRef(new HRTFDatabaseLoader(sampleRate));
61    loaderMap().add(sampleRate, loader.get());
62
63    loader->loadAsynchronously();
64
65    return loader;
66}
67
68HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate)
69    : m_databaseLoaderThread(0)
70    , m_databaseSampleRate(sampleRate)
71{
72    ASSERT(isMainThread());
73}
74
75HRTFDatabaseLoader::~HRTFDatabaseLoader()
76{
77    ASSERT(isMainThread());
78
79    waitForLoaderThreadCompletion();
80    m_hrtfDatabase = nullptr;
81
82    // Remove ourself from the map.
83    loaderMap().remove(m_databaseSampleRate);
84}
85
86// Asynchronously load the database in this thread.
87static void databaseLoaderEntry(void* threadData)
88{
89    HRTFDatabaseLoader* loader = reinterpret_cast<HRTFDatabaseLoader*>(threadData);
90    ASSERT(loader);
91    loader->load();
92}
93
94void HRTFDatabaseLoader::load()
95{
96    ASSERT(!isMainThread());
97    if (!m_hrtfDatabase.get()) {
98        // Load the default HRTF database.
99        m_hrtfDatabase = std::make_unique<HRTFDatabase>(m_databaseSampleRate);
100    }
101}
102
103void HRTFDatabaseLoader::loadAsynchronously()
104{
105    ASSERT(isMainThread());
106
107    MutexLocker locker(m_threadLock);
108
109    if (!m_hrtfDatabase.get() && !m_databaseLoaderThread) {
110        // Start the asynchronous database loading process.
111        m_databaseLoaderThread = createThread(databaseLoaderEntry, this, "HRTF database loader");
112    }
113}
114
115bool HRTFDatabaseLoader::isLoaded() const
116{
117    return m_hrtfDatabase.get();
118}
119
120void HRTFDatabaseLoader::waitForLoaderThreadCompletion()
121{
122    MutexLocker locker(m_threadLock);
123
124    // waitForThreadCompletion() should not be called twice for the same thread.
125    if (m_databaseLoaderThread)
126        waitForThreadCompletion(m_databaseLoaderThread);
127    m_databaseLoaderThread = 0;
128}
129
130} // namespace WebCore
131
132#endif // ENABLE(WEB_AUDIO)
133