Add m-esr52 at 52.6.0

1 files changed, 237 insertions, 0 deletions

diff --git a/dom/plugins/ipc/PluginUtilsWin.cpp b/dom/plugins/ipc/PluginUtilsWin.cpp
new file mode 100644
index 000000000..db6387a51
--- /dev/null
+++ b/dom/plugins/ipc/PluginUtilsWin.cpp
@@ -0,0 +1,237 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

+/* This Source Code Form is subject to the terms of the Mozilla Public

+ * License, v. 2.0. If a copy of the MPL was not distributed with this

+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

+

+/* PluginUtilsWin.cpp - top-level Windows plugin management code */

+

+#include <mmdeviceapi.h>

+#include "PluginUtilsWin.h"

+#include "PluginModuleParent.h"

+#include "mozilla/StaticMutex.h"

+

+namespace mozilla {

+namespace plugins {

+namespace PluginUtilsWin {

+

+typedef nsTHashtable<nsPtrHashKey<PluginModuleParent>> PluginModuleSet;

+StaticMutex sMutex;

+

+class AudioDeviceChangedRunnable : public Runnable

+{

+public:

+  explicit AudioDeviceChangedRunnable(const PluginModuleSet* aAudioNotificationSet,

+                                      NPAudioDeviceChangeDetailsIPC aChangeDetails) :

+      mChangeDetails(aChangeDetails)

+    , mAudioNotificationSet(aAudioNotificationSet)

+  {}

+

+  NS_IMETHOD Run() override

+  {

+    StaticMutexAutoLock lock(sMutex);

+    PLUGIN_LOG_DEBUG(("Notifying %d plugins of audio device change.",

+                                            mAudioNotificationSet->Count()));

+

+    for (auto iter = mAudioNotificationSet->ConstIter(); !iter.Done(); iter.Next()) {

+      PluginModuleParent* pluginModule = iter.Get()->GetKey();

+      pluginModule->SendNPP_SetValue_NPNVaudioDeviceChangeDetails(mChangeDetails);

+    }

+    return NS_OK;

+  }

+

+protected:

+  NPAudioDeviceChangeDetailsIPC mChangeDetails;

+  const PluginModuleSet* mAudioNotificationSet;

+};

+

+class AudioNotification : public IMMNotificationClient

+{

+public:

+  AudioNotification() :

+      mRefCt(1)

+    , mIsRegistered(false)

+  {

+    HRESULT hr = CoCreateInstance(__uuidof(MMDeviceEnumerator),

+                                  NULL, CLSCTX_INPROC_SERVER,

+                                  IID_PPV_ARGS(&mDeviceEnum));

+    if (FAILED(hr)) {

+      mDeviceEnum = nullptr;

+      return;

+    }

+

+    hr = mDeviceEnum->RegisterEndpointNotificationCallback(this);

+    if (FAILED(hr)) {

+      mDeviceEnum->Release();

+      mDeviceEnum = nullptr;

+      return;

+    }

+

+    mIsRegistered = true;

+  }

+

+  ~AudioNotification()

+  {

+    MOZ_ASSERT(!mIsRegistered,

+      "Destroying AudioNotification without first calling Unregister");

+    if (mDeviceEnum) {

+      mDeviceEnum->Release();

+    }

+  }

+

+  // IMMNotificationClient Implementation

+  HRESULT STDMETHODCALLTYPE

+  OnDefaultDeviceChanged(EDataFlow flow, ERole role, LPCWSTR device_id) override

+  {

+    NPAudioDeviceChangeDetailsIPC changeDetails;

+    changeDetails.flow = (int32_t)flow;

+    changeDetails.role = (int32_t)role;

+    changeDetails.defaultDevice = device_id ? std::wstring(device_id) : L"";

+

+    // Make sure that plugin is notified on the main thread.

+    RefPtr<AudioDeviceChangedRunnable> runnable =

+      new AudioDeviceChangedRunnable(&mAudioNotificationSet, changeDetails);

+    NS_DispatchToMainThread(runnable);

+    return S_OK;

+  }

+

+  HRESULT STDMETHODCALLTYPE

+  OnDeviceAdded(LPCWSTR device_id) override

+  {

+    return S_OK;

+  };

+

+  HRESULT STDMETHODCALLTYPE

+  OnDeviceRemoved(LPCWSTR device_id) override

+  {

+    return S_OK;

+  }

+

+  HRESULT STDMETHODCALLTYPE

+  OnDeviceStateChanged(LPCWSTR device_id, DWORD new_state) override

+  {

+    return S_OK;

+  }

+

+  HRESULT STDMETHODCALLTYPE

+  OnPropertyValueChanged(LPCWSTR device_id, const PROPERTYKEY key) override

+  {

+    return S_OK;

+  }

+

+  // IUnknown Implementation

+  ULONG STDMETHODCALLTYPE

+  AddRef() override

+  {

+    return InterlockedIncrement(&mRefCt);

+  }

+

+  ULONG STDMETHODCALLTYPE

+  Release() override

+  {

+    ULONG ulRef = InterlockedDecrement(&mRefCt);

+    if (0 == ulRef) {

+      delete this;

+    }

+    return ulRef;

+  }

+

+  HRESULT STDMETHODCALLTYPE

+  QueryInterface(REFIID riid, VOID **ppvInterface) override

+  {

+    if (__uuidof(IUnknown) == riid) {

+      AddRef();

+      *ppvInterface = (IUnknown*)this;

+    } else if (__uuidof(IMMNotificationClient) == riid) {

+      AddRef();

+      *ppvInterface = (IMMNotificationClient*)this;

+    } else {

+      *ppvInterface = NULL;

+      return E_NOINTERFACE;

+    }

+    return S_OK;

+  }

+

+  /*

+   * A Valid instance must be Unregistered before Releasing it.

+   */

+  void Unregister()

+  {

+    if (mDeviceEnum) {

+      mDeviceEnum->UnregisterEndpointNotificationCallback(this);

+    }

+    mIsRegistered = false;

+  }

+

+  /*

+   * True whenever the notification server is set to report events to this object.

+   */

+  bool IsRegistered() {

+    return mIsRegistered;

+  }

+

+  void AddModule(PluginModuleParent* aModule) {

+    StaticMutexAutoLock lock(sMutex);

+    mAudioNotificationSet.PutEntry(aModule);

+  }

+

+  void RemoveModule(PluginModuleParent* aModule) {

+    StaticMutexAutoLock lock(sMutex);

+    mAudioNotificationSet.RemoveEntry(aModule);

+  }

+

+  /*

+   * Are any modules registered for audio notifications?

+   */

+  bool HasModules() {

+    return !mAudioNotificationSet.IsEmpty();

+  }

+

+private:

+  bool mIsRegistered;   // only used to make sure that Unregister is called before destroying a Valid instance.

+  LONG mRefCt;

+  IMMDeviceEnumerator* mDeviceEnum;

+

+  // Set of plugin modules that have registered to be notified when the audio device

+  // changes.

+  PluginModuleSet mAudioNotificationSet;

+};  // class AudioNotification

+

+// callback that gets notified of audio device events, or NULL

+AudioNotification* sAudioNotification = nullptr;

+

+nsresult

+RegisterForAudioDeviceChanges(PluginModuleParent* aModuleParent, bool aShouldRegister)

+{

+  // Hold the AudioNotification singleton iff there are PluginModuleParents

+  // that are subscribed to it.

+  if (aShouldRegister) {

+    if (!sAudioNotification) {

+      // We are registering the first module.  Create the singleton.

+      sAudioNotification = new AudioNotification();

+      if (!sAudioNotification->IsRegistered()) {

+        PLUGIN_LOG_DEBUG(("Registered for plugin audio device notification failed."));

+        sAudioNotification->Release();

+        sAudioNotification = nullptr;

+        return NS_ERROR_FAILURE;

+      }

+      PLUGIN_LOG_DEBUG(("Registered for plugin audio device notification."));

+    }

+    sAudioNotification->AddModule(aModuleParent);

+  }

+  else if (!aShouldRegister && sAudioNotification) {

+    sAudioNotification->RemoveModule(aModuleParent);

+    if (!sAudioNotification->HasModules()) {

+      // We have removed the last module from the notification mechanism

+      // so we can destroy the singleton.

+      PLUGIN_LOG_DEBUG(("Unregistering for plugin audio device notification."));

+      sAudioNotification->Unregister();

+      sAudioNotification->Release();

+      sAudioNotification = nullptr;

+    }

+  }

+  return NS_OK;

+}

+

+}   // namespace PluginUtilsWin

+}   // namespace plugins

+}   // namespace mozilla