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