Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 133 insertions, 0 deletions

diff --git a/Source/WebCore/platform/audio/HRTFDatabaseLoader.cpp b/Source/WebCore/platform/audio/HRTFDatabaseLoader.cpp
new file mode 100644
index 0000000..4368d22
--- /dev/null
+++ b/Source/WebCore/platform/audio/HRTFDatabaseLoader.cpp
@@ -0,0 +1,133 @@
+/*
+ * 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 "config.h"
+
+#if ENABLE(WEB_AUDIO)
+
+#include "HRTFDatabaseLoader.h"
+
+#include "HRTFDatabase.h"
+
+namespace WebCore {
+
+// Singleton
+HRTFDatabaseLoader* HRTFDatabaseLoader::s_loader = 0;
+
+PassRefPtr<HRTFDatabaseLoader> HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(double sampleRate)
+{
+    ASSERT(isMainThread());
+
+    RefPtr<HRTFDatabaseLoader> loader;
+    
+    if (!s_loader) {
+        // Lazily create and load.
+        loader = adoptRef(new HRTFDatabaseLoader(sampleRate));
+        s_loader = loader.get();
+        loader->loadAsynchronously();
+    } else {
+        loader = s_loader;
+        ASSERT(sampleRate == loader->databaseSampleRate());
+    }
+    
+    return loader;
+}
+
+HRTFDatabaseLoader::HRTFDatabaseLoader(double sampleRate)
+    : m_hrtfDatabase(0)
+    , m_databaseLoaderThread(0)
+    , m_startedLoadingDatabase(false)
+    , m_databaseSampleRate(sampleRate)
+{
+    ASSERT(isMainThread());
+}
+
+HRTFDatabaseLoader::~HRTFDatabaseLoader()
+{
+    ASSERT(isMainThread());
+
+    if (m_startedLoadingDatabase)
+        waitForThreadCompletion(m_databaseLoaderThread, 0);
+    
+    m_startedLoadingDatabase = false;
+    m_databaseLoaderThread = 0;
+    
+    m_hrtfDatabase.clear();
+    
+    // Clear out singleton.
+    ASSERT(this == s_loader);
+    s_loader = 0;
+}
+
+
+// Asynchronously load the database in this thread.
+static void* databaseLoaderEntry(void* threadData)
+{
+    HRTFDatabaseLoader* loader = reinterpret_cast<HRTFDatabaseLoader*>(threadData);
+    ASSERT(loader);
+    loader->load();
+    
+    return 0;
+}
+
+void HRTFDatabaseLoader::load()
+{
+    ASSERT(!isMainThread());
+    if (!m_hrtfDatabase.get()) {
+        // Load the default HRTF database.
+        m_hrtfDatabase = HRTFDatabase::create(m_databaseSampleRate);
+    }
+}
+
+void HRTFDatabaseLoader::loadAsynchronously()
+{
+    ASSERT(isMainThread());
+    
+    if (!m_hrtfDatabase.get() && !m_startedLoadingDatabase) {
+        // Start the asynchronous database loading process.
+        m_startedLoadingDatabase = true;
+        m_databaseLoaderThread = createThread(databaseLoaderEntry, this, "HRTF database loader");
+    }
+}
+
+bool HRTFDatabaseLoader::isLoaded() const
+{
+    return m_hrtfDatabase.get();
+}
+
+HRTFDatabase* HRTFDatabaseLoader::defaultHRTFDatabase()
+{
+    if (!s_loader)
+        return 0;
+    
+    return s_loader->database();
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_AUDIO)