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
39namespace WebCore {
40
41// Singleton
42HRTFDatabaseLoader::LoaderMap* HRTFDatabaseLoader::s_loaderMap = 0;
43
44PassRefPtr<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
67HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate)
68    : m_databaseSampleRate(sampleRate)
69{
70    ASSERT(isMainThread());
71}
72
73HRTFDatabaseLoader::~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
85void 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
94void 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
107bool HRTFDatabaseLoader::isLoaded() const
108{
109    return m_hrtfDatabase;
110}
111
112void HRTFDatabaseLoader::waitForLoaderThreadCompletion()
113{
114    MutexLocker locker(m_threadLock);
115    m_databaseLoaderThread.clear();
116}
117
118} // namespace WebCore
119
120#endif // ENABLE(WEB_AUDIO)
121