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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "HRTFDatabaseLoader.h"
#include "HRTFDatabase.h"
#include <wtf/HashMap.h>
#include <wtf/MainThread.h>
#include <wtf/NeverDestroyed.h>
namespace WebCore {
// Keeps track of loaders on a per-sample-rate basis.
static HashMap<double, ThreadSafeWeakPtr<HRTFDatabaseLoader>>& loaderMap()
{
static NeverDestroyed<HashMap<double, ThreadSafeWeakPtr<HRTFDatabaseLoader>>> loaderMap;
return loaderMap;
}
Ref<HRTFDatabaseLoader> HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(float sampleRate)
{
ASSERT(isMainThread());
if (RefPtr<HRTFDatabaseLoader> loader = loaderMap().get(sampleRate).get()) {
ASSERT(sampleRate == loader->databaseSampleRate());
return loader.releaseNonNull();
}
auto loader = adoptRef(*new HRTFDatabaseLoader(sampleRate));
loaderMap().set(sampleRate, loader.ptr());
loader->loadAsynchronously();
return loader;
}
HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate)
: m_databaseSampleRate(sampleRate)
{
ASSERT(isMainThread());
}
HRTFDatabaseLoader::~HRTFDatabaseLoader()
{
ASSERT(isMainThread());
waitForLoaderThreadCompletion();
m_hrtfDatabase = nullptr;
// Try to remove ourselves from the map, but
// not if the cached loader with our sample
// rate is not actually the this being destroyed.
auto it = loaderMap().find(m_databaseSampleRate);
if (it == loaderMap().end())
return;
RefPtr loader = it->value.get();
if (loader && loader.get() != this)
return;
loaderMap().remove(it);
}
void HRTFDatabaseLoader::load()
{
ASSERT(!isMainThread());
if (!m_hrtfDatabase.get()) {
// Load the default HRTF database.
m_hrtfDatabase = makeUnique<HRTFDatabase>(m_databaseSampleRate);
}
}
void HRTFDatabaseLoader::loadAsynchronously()
{
ASSERT(isMainThread());
Locker locker { m_threadLock };
if (!m_hrtfDatabase.get() && !m_databaseLoaderThread) {
// Start the asynchronous database loading process.
m_databaseLoaderThread = Thread::create("HRTF database loader"_s, [this] {
load();
});
}
}
bool HRTFDatabaseLoader::isLoaded() const
{
return m_hrtfDatabase.get();
}
void HRTFDatabaseLoader::waitForLoaderThreadCompletion()
{
Locker locker { m_threadLock };
// waitForThreadCompletion() should not be called twice for the same thread.
if (m_databaseLoaderThread)
m_databaseLoaderThread->waitForCompletion();
m_databaseLoaderThread = nullptr;
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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