diff -r 000000000000 -r 6474c204b198 content/media/directshow/DirectShowDecoder.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/media/directshow/DirectShowDecoder.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,45 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#if !defined(DirectShowDecoder_h_)
+#define DirectShowDecoder_h_
+
+#include "MediaDecoder.h"
+
+namespace mozilla {
+
+// Decoder that uses DirectShow to playback MP3 files only.
+class DirectShowDecoder : public MediaDecoder
+{
+public:
+
+  DirectShowDecoder();
+  virtual ~DirectShowDecoder();
+
+  MediaDecoder* Clone() MOZ_OVERRIDE {
+    if (!IsEnabled()) {
+      return nullptr;
+    }
+    return new DirectShowDecoder();
+  }
+
+  MediaDecoderStateMachine* CreateStateMachine() MOZ_OVERRIDE;
+
+  // Returns true if aType is a MIME type that we render with the
+  // DirectShow backend. If aCodecList is non null,
+  // it is filled with a (static const) null-terminated list of strings
+  // denoting the codecs we'll playback. Note that playback is strictly
+  // limited to MP3 only.
+  static bool GetSupportedCodecs(const nsACString& aType,
+                                 char const *const ** aCodecList);
+
+  // Returns true if the DirectShow backend is preffed on.
+  static bool IsEnabled();
+};
+
+} // namespace mozilla
+
+#endif