tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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VALibWrapper.h (2642B)

      1 /* This Source Code Form is subject to the terms of the Mozilla Public
      2 * License, v. 2.0. If a copy of the MPL was not distributed with this
      3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      4 
      5 #ifndef DOM_MEDIA_PLATFORMS_FFMPEG_VALIBWRAPPER_H_
      6 #define DOM_MEDIA_PLATFORMS_FFMPEG_VALIBWRAPPER_H_
      7 
      8 #include "mozilla/Attributes.h"
      9 #include "mozilla/UniquePtrExtensions.h"
     10 #include "nsISupportsImpl.h"
     11 
     12 struct PRLibrary;
     13 
     14 #ifdef MOZ_WIDGET_GTK
     15 
     16 // Forward declare from va.h
     17 typedef void* VADisplay;
     18 typedef int VAStatus;
     19 #  define VA_EXPORT_SURFACE_READ_ONLY 0x0001
     20 #  define VA_EXPORT_SURFACE_SEPARATE_LAYERS 0x0004
     21 #  define VA_STATUS_SUCCESS 0x00000000
     22 
     23 namespace mozilla {
     24 
     25 class MOZ_ONLY_USED_TO_AVOID_STATIC_CONSTRUCTORS VALibWrapper {
     26 public:
     27  // The class is used only in static storage and so is zero initialized.
     28  VALibWrapper() = default;
     29  // The libraries are not unloaded in the destructor, because doing so would
     30  // require a static constructor to register the static destructor.  As the
     31  // class is in static storage, the destructor would only run on shutdown
     32  // anyway.
     33  ~VALibWrapper() = default;
     34 
     35  // Check if sVALib and sVALibDrm are available with necessary symbols and
     36  // initialize sFuncs;
     37  static bool IsVAAPIAvailable();
     38  static VALibWrapper sFuncs;
     39 
     40 private:
     41  void Link();
     42  bool AreVAAPIFuncsAvailable();
     43  // Attempt to load libva-drm and libva and resolve necessary symbols.
     44  // Upon failure, the entire object will be reset and any attached libraries
     45  // will be unlinked.  Do not invoke more than once.
     46  bool LinkVAAPILibs();
     47 
     48 public:
     49  int (*vaExportSurfaceHandle)(void*, unsigned int, uint32_t, uint32_t, void*);
     50  int (*vaSyncSurface)(void*, unsigned int);
     51 
     52 private:
     53  PRLibrary* mVALib;
     54  PRLibrary* mVALibDrm;
     55 };
     56 
     57 class VADisplayHolder {
     58 public:
     59  NS_INLINE_DECL_THREADSAFE_REFCOUNTING_WITH_DESTROY(VADisplayHolder,
     60                                                     MaybeDestroy())
     61 
     62  static RefPtr<VADisplayHolder> GetSingleton();
     63 
     64  VADisplay Display() const { return mDisplay.get(); }
     65 
     66 private:
     67  struct VADisplayDeleter {
     68    using pointer = VADisplay;
     69    void operator()(VADisplay aDisplay);
     70  };
     71  using UniqueVADisplay = std::unique_ptr<VADisplay, VADisplayDeleter>;
     72 
     73  VADisplayHolder(UniqueVADisplay aDisplay, UniqueFileHandle aDRMFd);
     74  ~VADisplayHolder();
     75 
     76  void MaybeDestroy();
     77 
     78  // mDRMFd is declared before mDisplay, so that mDRMFd is closed after
     79  // mDisplay is terminated.
     80  const UniqueFileHandle mDRMFd;
     81  const UniqueVADisplay mDisplay;
     82 };
     83 
     84 }  // namespace mozilla
     85 #endif  // MOZ_WIDGET_GTK
     86 
     87 #endif  // DOM_MEDIA_PLATFORMS_FFMPEG_VALIBWRAPPER_H_