michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* vim:set ts=2 sw=2 sts=2 et cindent: */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: #if !defined(WMFDecoder_h_)
michael@0: #define WMFDecoder_h_
michael@0: 
michael@0: #include "MediaDecoder.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: // Decoder that uses Windows Media Foundation to playback H.264/AAC in MP4
michael@0: // and M4A files, and MP3 files if the DirectShow backend is disabled.
michael@0: // Playback is strictly limited to only those codecs.
michael@0: class WMFDecoder : public MediaDecoder
michael@0: {
michael@0: public:
michael@0: 
michael@0:   virtual MediaDecoder* Clone() {
michael@0:     if (!IsWMFEnabled()) {
michael@0:       return nullptr;
michael@0:     }
michael@0:     return new WMFDecoder();
michael@0:   }
michael@0: 
michael@0:   virtual MediaDecoderStateMachine* CreateStateMachine();
michael@0: 
michael@0:   // Loads the DLLs required by Windows Media Foundation. If this returns
michael@0:   // failure, you can assume that WMF is not available on the user's system.
michael@0:   static nsresult LoadDLLs();
michael@0:   static void UnloadDLLs();
michael@0: 
michael@0:   // Returns true if the WMF backend is preffed on, and we're running on a
michael@0:   // version of Windows which is likely to support WMF.
michael@0:   static bool IsEnabled();
michael@0: 
michael@0:   // Returns true if MP3 decoding is enabled on this system. We block
michael@0:   // MP3 playback on Windows 7 SP0, since it's crashy on that platform.
michael@0:   static bool IsMP3Supported();
michael@0: 
michael@0:   // Returns the HTMLMediaElement.canPlayType() result for the mime type
michael@0:   // and codecs parameter. aCodecs can be empty.
michael@0:   static bool CanPlayType(const nsACString& aType,
michael@0:                           const nsAString& aCodecs);
michael@0: 
michael@0: };
michael@0: 
michael@0: } // namespace mozilla
michael@0: 
michael@0: #endif