1 files changed, 215 insertions, 0 deletions
diff --git a/dom/media/webaudio/blink/HRTFDatabaseLoader.cpp b/dom/media/webaudio/blink/HRTFDatabaseLoader.cpp
new file mode 100644
index 0000000000..3db455545e
--- /dev/null
+++ b/dom/media/webaudio/blink/HRTFDatabaseLoader.cpp
@@ -0,0 +1,215 @@
+/*
+ * 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 "HRTFDatabaseLoader.h"
+#include "HRTFDatabase.h"
+#include "GeckoProfiler.h"
+#include "nsThreadUtils.h"
+
+using namespace mozilla;
+
+namespace WebCore {
+
+// Singleton
+nsTHashtable<HRTFDatabaseLoader::LoaderByRateEntry>*
+    HRTFDatabaseLoader::s_loaderMap = nullptr;
+
+size_t HRTFDatabaseLoader::sizeOfLoaders(mozilla::MallocSizeOf aMallocSizeOf) {
+  return s_loaderMap ? s_loaderMap->SizeOfIncludingThis(aMallocSizeOf) : 0;
+}
+
+already_AddRefed<HRTFDatabaseLoader>
+HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(float sampleRate) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<HRTFDatabaseLoader> loader;
+
+  if (!s_loaderMap) {
+    s_loaderMap = new nsTHashtable<LoaderByRateEntry>();
+  }
+
+  LoaderByRateEntry* entry = s_loaderMap->PutEntry(sampleRate);
+  loader = entry->mLoader;
+  if (loader) {  // existing entry
+    MOZ_ASSERT(sampleRate == loader->databaseSampleRate());
+    return loader.forget();
+  }
+
+  loader = new HRTFDatabaseLoader(sampleRate);
+  entry->mLoader = loader;
+
+  loader->loadAsynchronously();
+
+  return loader.forget();
+}
+
+HRTFDatabaseLoader::HRTFDatabaseLoader(float sampleRate)
+    : m_refCnt(0),
+      m_threadLock("HRTFDatabaseLoader"),
+      m_databaseLoaderThread(nullptr),
+      m_databaseSampleRate(sampleRate),
+      m_databaseLoaded(false) {
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+HRTFDatabaseLoader::~HRTFDatabaseLoader() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  waitForLoaderThreadCompletion();
+  m_hrtfDatabase.reset();
+
+  if (s_loaderMap) {
+    // Remove ourself from the map.
+    s_loaderMap->RemoveEntry(m_databaseSampleRate);
+    if (s_loaderMap->Count() == 0) {
+      delete s_loaderMap;
+      s_loaderMap = nullptr;
+    }
+  }
+}
+
+size_t HRTFDatabaseLoader::sizeOfIncludingThis(
+    mozilla::MallocSizeOf aMallocSizeOf) const {
+  size_t amount = aMallocSizeOf(this);
+
+  // NB: Need to make sure we're not competing with the loader thread.
+  const_cast<HRTFDatabaseLoader*>(this)->waitForLoaderThreadCompletion();
+
+  if (m_hrtfDatabase) {
+    amount += m_hrtfDatabase->sizeOfIncludingThis(aMallocSizeOf);
+  }
+
+  return amount;
+}
+
+class HRTFDatabaseLoader::ProxyReleaseEvent final : public Runnable {
+ public:
+  explicit ProxyReleaseEvent(HRTFDatabaseLoader* loader)
+      : mozilla::Runnable("WebCore::HRTFDatabaseLoader::ProxyReleaseEvent"),
+        mLoader(loader) {}
+  NS_IMETHOD Run() override {
+    mLoader->MainThreadRelease();
+    return NS_OK;
+  }
+
+ private:
+  // Ownership transferred by ProxyRelease
+  HRTFDatabaseLoader* MOZ_OWNING_REF mLoader;
+};
+
+void HRTFDatabaseLoader::ProxyRelease() {
+  nsCOMPtr<nsIEventTarget> mainTarget = GetMainThreadSerialEventTarget();
+  if (MOZ_LIKELY(mainTarget)) {
+    RefPtr<ProxyReleaseEvent> event = new ProxyReleaseEvent(this);
+    DebugOnly<nsresult> rv = mainTarget->Dispatch(event, NS_DISPATCH_NORMAL);
+    MOZ_ASSERT(NS_SUCCEEDED(rv), "Failed to dispatch release event");
+  } else {
+    // Should be in XPCOM shutdown.
+    MOZ_ASSERT(NS_IsMainThread(), "Main thread is not available for dispatch.");
+    MainThreadRelease();
+  }
+}
+
+void HRTFDatabaseLoader::MainThreadRelease() {
+  MOZ_ASSERT(NS_IsMainThread());
+  int count = --m_refCnt;
+  MOZ_ASSERT(count >= 0, "extra release");
+  NS_LOG_RELEASE(this, count, "HRTFDatabaseLoader");
+  if (count == 0) {
+    // It is safe to delete here as the first reference can only be added
+    // on this (main) thread.
+    delete this;
+  }
+}
+
+// Asynchronously load the database in this thread.
+static void databaseLoaderEntry(void* threadData) {
+  AUTO_PROFILER_REGISTER_THREAD("HRTFDatabaseLdr");
+  NS_SetCurrentThreadName("HRTFDatabaseLdr");
+
+  HRTFDatabaseLoader* loader =
+      reinterpret_cast<HRTFDatabaseLoader*>(threadData);
+  MOZ_ASSERT(loader);
+  loader->load();
+}
+
+void HRTFDatabaseLoader::load() {
+  MOZ_ASSERT(!NS_IsMainThread());
+  MOZ_ASSERT(!m_hrtfDatabase.get(), "Called twice");
+  // Load the default HRTF database.
+  m_hrtfDatabase = HRTFDatabase::create(m_databaseSampleRate);
+  m_databaseLoaded = true;
+  // Notifies the main thread of completion.  See loadAsynchronously().
+  Release();
+}
+
+void HRTFDatabaseLoader::loadAsynchronously() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(m_refCnt, "Must not be called before a reference is added");
+
+  // Add a reference so that the destructor won't run and wait for the
+  // loader thread, until load() has completed.
+  AddRef();
+
+  MutexAutoLock locker(m_threadLock);
+
+  MOZ_ASSERT(!m_hrtfDatabase.get() && !m_databaseLoaderThread, "Called twice");
+  // Start the asynchronous database loading process.
+  m_databaseLoaderThread = PR_CreateThread(
+      PR_USER_THREAD, databaseLoaderEntry, this, PR_PRIORITY_NORMAL,
+      PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);
+}
+
+bool HRTFDatabaseLoader::isLoaded() const { return m_hrtfDatabase.get(); }
+
+void HRTFDatabaseLoader::waitForLoaderThreadCompletion() {
+  MutexAutoLock locker(m_threadLock);
+
+  // waitForThreadCompletion() should not be called twice for the same thread.
+  if (m_databaseLoaderThread) {
+    DebugOnly<PRStatus> status = PR_JoinThread(m_databaseLoaderThread);
+    MOZ_ASSERT(status == PR_SUCCESS, "PR_JoinThread failed");
+  }
+  m_databaseLoaderThread = nullptr;
+}
+
+void HRTFDatabaseLoader::shutdown() {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (s_loaderMap) {
+    // Set s_loaderMap to nullptr so that the hashtable is not modified on
+    // reference release during enumeration.
+    nsTHashtable<LoaderByRateEntry>* loaderMap = s_loaderMap;
+    s_loaderMap = nullptr;
+    for (auto iter = loaderMap->Iter(); !iter.Done(); iter.Next()) {
+      iter.Get()->mLoader->waitForLoaderThreadCompletion();
+    }
+    delete loaderMap;
+  }
+}
+
+}  // namespace WebCore