gecko/content/media/gstreamer/GStreamerFormatHelper.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#if !defined(GStreamerFormatHelper_h_)
#define GStreamerFormatHelper_h_
#include <gst/gst.h>
#include <mozilla/Types.h>
#include "nsXPCOMStrings.h"
namespace mozilla {
class GStreamerFormatHelper {
/* This class can be used to query the GStreamer registry for the required
* demuxers/decoders from nsHTMLMediaElement::CanPlayType.
* It implements looking at the GstRegistry to check if elements to
* demux/decode the formats passed to CanPlayType() are actually installed.
*/
public:
static GStreamerFormatHelper* Instance();
~GStreamerFormatHelper();
bool CanHandleMediaType(const nsACString& aMIMEType,
const nsAString* aCodecs);
bool CanHandleContainerCaps(GstCaps* aCaps);
bool CanHandleCodecCaps(GstCaps* aCaps);
static GstCaps* ConvertFormatsToCaps(const char* aMIMEType,
const nsAString* aCodecs);
static void Shutdown();
private:
GStreamerFormatHelper();
char* const *CodecListFromCaps(GstCaps* aCaps);
bool HaveElementsToProcessCaps(GstCaps* aCaps);
GList* GetFactories();
static GStreamerFormatHelper* gInstance;
/* table to convert from container MIME types to GStreamer caps */
static char const *const mContainers[6][2];
/* table to convert from codec MIME types to GStreamer caps */
static char const *const mCodecs[9][2];
/*
* True iff we were able to find the proper GStreamer libs and the functions
* we need.
*/
static bool sLoadOK;
/* whitelist of supported container/codec gst caps */
GstCaps* mSupportedContainerCaps;
GstCaps* mSupportedCodecCaps;
/* list of GStreamer element factories
* Element factories are the basic types retrieved from the GStreamer
* registry, they describe all plugins and elements that GStreamer can
* create.
* This means that element factories are useful for automated element
* instancing, such as what autopluggers do,
* and for creating lists of available elements. */
GList* mFactories;
/* Storage for the default registrys feature list cookie.
* It changes every time a feature is added to or removed from the
* GStreamer registry. */
uint32_t mCookie;
};
} //namespace mozilla
#endif