diff -r 000000000000 -r 6474c204b198 content/media/directshow/DirectShowUtils.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/media/directshow/DirectShowUtils.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,115 @@
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+
+#ifndef _DirectShowUtils_h_
+#define _DirectShowUtils_h_
+
+#include <stdint.h>
+#include "dshow.h"
+#include "DShowTools.h"
+#include "prlog.h"
+
+namespace mozilla {
+
+// Win32 "Event" wrapper. Must be paired with a CriticalSection to create a
+// Java-style "monitor".
+class Signal {
+public:
+
+  Signal(CriticalSection* aLock)
+    : mLock(aLock)
+  {
+    CriticalSectionAutoEnter lock(*mLock);
+    mEvent = CreateEvent(nullptr, FALSE, FALSE, nullptr);
+  }
+
+  ~Signal() {
+    CriticalSectionAutoEnter lock(*mLock);
+    CloseHandle(mEvent);
+  }
+
+  // Lock must be held.
+  void Notify() {
+    SetEvent(mEvent);
+  }
+
+  // Lock must be held. Check the wait condition before waiting!
+  HRESULT Wait() {
+    mLock->Leave();
+    DWORD result = WaitForSingleObject(mEvent, INFINITE);
+    mLock->Enter();
+    return result == WAIT_OBJECT_0 ? S_OK : E_FAIL;
+  }
+
+private:
+  CriticalSection* mLock;
+  HANDLE mEvent;
+};
+
+HRESULT
+AddGraphToRunningObjectTable(IUnknown *aUnkGraph, DWORD *aOutRotRegister);
+
+void
+RemoveGraphFromRunningObjectTable(DWORD aRotRegister);
+
+const char*
+GetGraphNotifyString(long evCode);
+
+// Creates a filter and adds it to a graph.
+HRESULT
+CreateAndAddFilter(IGraphBuilder* aGraph,
+                   REFGUID aFilterClsId,
+                   LPCWSTR aFilterName,
+                   IBaseFilter **aOutFilter);
+
+HRESULT
+AddMP3DMOWrapperFilter(IGraphBuilder* aGraph,
+                       IBaseFilter **aOutFilter);
+
+// Connects the output pin on aOutputFilter to an input pin on
+// aInputFilter, in aGraph.
+HRESULT
+ConnectFilters(IGraphBuilder* aGraph,
+               IBaseFilter* aOutputFilter,
+               IBaseFilter* aInputFilter);
+
+HRESULT
+MatchUnconnectedPin(IPin* aPin,
+                    PIN_DIRECTION aPinDir,
+                    bool *aOutMatches);
+
+// Converts from microseconds to DirectShow "Reference Time"
+// (hundreds of nanoseconds).
+inline int64_t
+UsecsToRefTime(const int64_t aUsecs)
+{
+  return aUsecs * 10;
+}
+
+// Converts from DirectShow "Reference Time" (hundreds of nanoseconds)
+// to microseconds.
+inline int64_t
+RefTimeToUsecs(const int64_t hRefTime)
+{
+  return hRefTime / 10;
+}
+
+// Converts from DirectShow "Reference Time" (hundreds of nanoseconds)
+// to seconds.
+inline double
+RefTimeToSeconds(const REFERENCE_TIME aRefTime)
+{
+  return double(aRefTime) / 10000000;
+}
+
+
+#if defined(PR_LOGGING)
+const char*
+GetDirectShowGuidName(const GUID& aGuid);
+#endif
+
+} // namespace mozilla
+
+#endif