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 file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #if !defined(GStreamerFormatHelper_h_)
michael@0: #define GStreamerFormatHelper_h_
michael@0: 
michael@0: #include <gst/gst.h>
michael@0: #include <mozilla/Types.h>
michael@0: #include "nsXPCOMStrings.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: class GStreamerFormatHelper {
michael@0:   /* This class can be used to query the GStreamer registry for the required
michael@0:    * demuxers/decoders from nsHTMLMediaElement::CanPlayType.
michael@0:    * It implements looking at the GstRegistry to check if elements to
michael@0:    * demux/decode the formats passed to CanPlayType() are actually installed.
michael@0:    */
michael@0:   public:
michael@0:     static GStreamerFormatHelper* Instance();
michael@0:     ~GStreamerFormatHelper();
michael@0: 
michael@0:     bool CanHandleMediaType(const nsACString& aMIMEType,
michael@0:                             const nsAString* aCodecs);
michael@0: 
michael@0:     bool CanHandleContainerCaps(GstCaps* aCaps);
michael@0:     bool CanHandleCodecCaps(GstCaps* aCaps);
michael@0: 
michael@0:     static GstCaps* ConvertFormatsToCaps(const char* aMIMEType,
michael@0:                                          const nsAString* aCodecs);
michael@0: 
michael@0:     static void Shutdown();
michael@0: 
michael@0:   private:
michael@0:     GStreamerFormatHelper();
michael@0:     char* const *CodecListFromCaps(GstCaps* aCaps);
michael@0:     bool HaveElementsToProcessCaps(GstCaps* aCaps);
michael@0:     GList* GetFactories();
michael@0: 
michael@0:     static GStreamerFormatHelper* gInstance;
michael@0: 
michael@0:     /* table to convert from container MIME types to GStreamer caps */
michael@0:     static char const *const mContainers[6][2];
michael@0: 
michael@0:     /* table to convert from codec MIME types to GStreamer caps */
michael@0:     static char const *const mCodecs[9][2];
michael@0: 
michael@0:     /*
michael@0:      * True iff we were able to find the proper GStreamer libs and the functions
michael@0:      * we need.
michael@0:      */
michael@0:     static bool sLoadOK;
michael@0: 
michael@0:     /* whitelist of supported container/codec gst caps */
michael@0:     GstCaps* mSupportedContainerCaps;
michael@0:     GstCaps* mSupportedCodecCaps;
michael@0: 
michael@0:     /* list of GStreamer element factories
michael@0:      * Element factories are the basic types retrieved from the GStreamer
michael@0:      * registry, they describe all plugins and elements that GStreamer can
michael@0:      * create.
michael@0:      * This means that element factories are useful for automated element
michael@0:      * instancing, such as what autopluggers do,
michael@0:      * and for creating lists of available elements. */
michael@0:     GList* mFactories;
michael@0: 
michael@0:     /* Storage for the default registrys feature list cookie.
michael@0:      * It changes every time a feature is added to or removed from the
michael@0:      * GStreamer registry. */
michael@0:     uint32_t mCookie;
michael@0: };
michael@0: 
michael@0: } //namespace mozilla
michael@0: 
michael@0: #endif