The Tor Browser: content/media/gstreamer/GStreamerFormatHelper.h@44a2da4a2ab2

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:set ts=2 sw=2 sts=2 et cindent: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     5  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #if !defined(GStreamerFormatHelper_h_)

     8 #define GStreamerFormatHelper_h_

    10 #include <gst/gst.h>

    11 #include <mozilla/Types.h>

    12 #include "nsXPCOMStrings.h"

    14 namespace mozilla {

    16 class GStreamerFormatHelper {

    17   /* This class can be used to query the GStreamer registry for the required

    18    * demuxers/decoders from nsHTMLMediaElement::CanPlayType.

    19    * It implements looking at the GstRegistry to check if elements to

    20    * demux/decode the formats passed to CanPlayType() are actually installed.

    21    */

    22   public:

    23     static GStreamerFormatHelper* Instance();

    24     ~GStreamerFormatHelper();

    26     bool CanHandleMediaType(const nsACString& aMIMEType,

    27                             const nsAString* aCodecs);

    29     bool CanHandleContainerCaps(GstCaps* aCaps);

    30     bool CanHandleCodecCaps(GstCaps* aCaps);

    32     static GstCaps* ConvertFormatsToCaps(const char* aMIMEType,

    33                                          const nsAString* aCodecs);

    35     static void Shutdown();

    37   private:

    38     GStreamerFormatHelper();

    39     char* const *CodecListFromCaps(GstCaps* aCaps);

    40     bool HaveElementsToProcessCaps(GstCaps* aCaps);

    41     GList* GetFactories();

    43     static GStreamerFormatHelper* gInstance;

    45     /* table to convert from container MIME types to GStreamer caps */

    46     static char const *const mContainers[6][2];

    48     /* table to convert from codec MIME types to GStreamer caps */

    49     static char const *const mCodecs[9][2];

    51     /*

    52      * True iff we were able to find the proper GStreamer libs and the functions

    53      * we need.

    54      */

    55     static bool sLoadOK;

    57     /* whitelist of supported container/codec gst caps */

    58     GstCaps* mSupportedContainerCaps;

    59     GstCaps* mSupportedCodecCaps;

    61     /* list of GStreamer element factories

    62      * Element factories are the basic types retrieved from the GStreamer

    63      * registry, they describe all plugins and elements that GStreamer can

    64      * create.

    65      * This means that element factories are useful for automated element

    66      * instancing, such as what autopluggers do,

    67      * and for creating lists of available elements. */

    68     GList* mFactories;

    70     /* Storage for the default registrys feature list cookie.

    71      * It changes every time a feature is added to or removed from the

    72      * GStreamer registry. */

    73     uint32_t mCookie;

    74 };

    76 } //namespace mozilla

    78 #endif

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