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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 Computer, 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 "third_party/blink/renderer/platform/audio/hrtf_database_loader.h"
#include "base/location.h"
#include "base/synchronization/waitable_event.h"
#include "third_party/blink/renderer/platform/scheduler/public/post_cross_thread_task.h"
#include "third_party/blink/renderer/platform/scheduler/public/thread.h"
#include "third_party/blink/renderer/platform/wtf/cross_thread_functional.h"
namespace blink {
using LoaderMap = HashMap<double, HRTFDatabaseLoader*>;
// getLoaderMap() returns the static hash map that contains the mapping between
// the sample rate and the corresponding HRTF database.
static LoaderMap& GetLoaderMap() {
DEFINE_STATIC_LOCAL(LoaderMap*, map, (new LoaderMap));
return *map;
}
scoped_refptr<HRTFDatabaseLoader>
HRTFDatabaseLoader::CreateAndLoadAsynchronouslyIfNecessary(float sample_rate) {
DCHECK(IsMainThread());
auto it = GetLoaderMap().find(sample_rate);
if (it != GetLoaderMap().end()) {
scoped_refptr<HRTFDatabaseLoader> loader = it->value;
DCHECK_EQ(sample_rate, loader->database_sample_rate_);
return loader;
}
scoped_refptr<HRTFDatabaseLoader> loader =
base::AdoptRef(new HRTFDatabaseLoader(sample_rate));
GetLoaderMap().insert(sample_rate, loader.get());
loader->LoadAsynchronously();
return loader;
}
HRTFDatabaseLoader::HRTFDatabaseLoader(float sample_rate)
: database_sample_rate_(sample_rate) {
DCHECK(IsMainThread());
}
HRTFDatabaseLoader::~HRTFDatabaseLoader() {
DCHECK(IsMainThread());
DCHECK(!thread_);
GetLoaderMap().erase(database_sample_rate_);
}
void HRTFDatabaseLoader::LoadTask() {
DCHECK(!IsMainThread());
// Protect access to `hrtf_database_`, which can be accessed from the audio
// thread.
base::AutoLock locker(lock_);
DCHECK(!hrtf_database_);
// Load the default HRTF database.
hrtf_database_ = std::make_unique<HRTFDatabase>(database_sample_rate_);
}
void HRTFDatabaseLoader::LoadAsynchronously() {
DCHECK(IsMainThread());
base::AutoLock locker(lock_);
// `hrtf_database_` and `thread_` should both be unset because this should be
// a new HRTFDatabaseLoader object that was just created by
// CreateAndLoadAsynchronouslyIfNecessary and because we haven't started
// LoadTask yet for this object.
DCHECK(!hrtf_database_);
DCHECK(!thread_);
// Start the asynchronous database loading process.
thread_ = NonMainThread::CreateThread(
ThreadCreationParams(ThreadType::kHRTFDatabaseLoaderThread));
// TODO(alexclarke): Should this be posted as a loading task?
PostCrossThreadTask(*thread_->GetTaskRunner(), FROM_HERE,
CrossThreadBindOnce(&HRTFDatabaseLoader::LoadTask,
CrossThreadUnretained(this)));
}
HRTFDatabase* HRTFDatabaseLoader::Database() {
DCHECK(!IsMainThread());
// Seeing that this is only called from the audio thread, we can't block.
// It's ok to return nullptr if we can't get the lock.
base::AutoTryLock try_locker(lock_);
if (!try_locker.is_acquired()) {
return nullptr;
}
return hrtf_database_.get();
}
// This cleanup task is needed just to make sure that the loader thread finishes
// the load task and thus the loader thread doesn't touch thread_ any more.
void HRTFDatabaseLoader::CleanupTask(base::WaitableEvent* sync) {
sync->Signal();
}
void HRTFDatabaseLoader::WaitForLoaderThreadCompletion() {
// We can lock this because this is called from either the main thread or
// the offline audio rendering thread.
base::AutoLock locker(lock_);
if (!thread_) {
return;
}
base::WaitableEvent sync;
// TODO(alexclarke): Should this be posted as a loading task?
PostCrossThreadTask(*thread_->GetTaskRunner(), FROM_HERE,
CrossThreadBindOnce(&HRTFDatabaseLoader::CleanupTask,
CrossThreadUnretained(this),
CrossThreadUnretained(&sync)));
sync.Wait();
thread_.reset();
}
} // namespace blink
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