mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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c8380cb0d2
Maybe gcc can do something clever with that, or at least warn us if we don't save the return value somewhere.
314 lines
13 KiB
C
314 lines
13 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000,2004 Wim Taymans <wim@fluendo.com>
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*
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* gstelement.h: Header for GstElement
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_ELEMENT_FACTORY_H__
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#define __GST_ELEMENT_FACTORY_H__
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typedef struct _GstElementFactory GstElementFactory;
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typedef struct _GstElementFactoryClass GstElementFactoryClass;
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#include <gst/gstconfig.h>
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#include <gst/gstelement.h>
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#include <gst/gstobject.h>
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#include <gst/gstplugin.h>
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#include <gst/gstpluginfeature.h>
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#include <gst/gstiterator.h>
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G_BEGIN_DECLS
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/* FIXME 0.11: Move GstElementDetails into a private header and use it internally
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* in GstElementFactory, GstElementClass and the registry
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*/
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typedef struct _GstElementDetails GstElementDetails;
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/**
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* GstElementDetails:
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* @longname: long, english name
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* @klass: string describing the type of element, as an unordered list
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* separated with slashes ('/'). See draft-klass.txt of the design docs
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* for more details and common types
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* @description: what the element is about
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* @author: who wrote this thing?
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*
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* This struct defines the public information about a #GstElement. It contains
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* meta-data about the element that is mostly for the benefit of editors.
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*
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* The @klass member can be used by applications to filter elements based
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* on functionality.
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*/
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/* FIXME: need translatable stuff in here (how handle in registry)?
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* can't we use _N("long name") in element implementations and use _(longname)
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* in gst_element_factory_get_longname()
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*/
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struct _GstElementDetails
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{
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/*< public > */
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gchar *longname;
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gchar *klass;
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gchar *description;
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gchar *author;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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/**
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* GST_ELEMENT_DETAILS:
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* @longname: long, english name
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* @klass: string describing the type of element, as an unordered list
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* separated with slashes ('/'). See draft-klass.txt of the design docs
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* for more details and common types
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* @description: what the element is about
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* @author: who wrote this element
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*
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* Macro to initialize #GstElementDetails.
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*/
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#define GST_ELEMENT_DETAILS(longname,klass,description,author) \
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{ longname, klass, description, author, {NULL} }
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/**
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* GST_IS_ELEMENT_DETAILS:
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* @details: the #GstElementDetails to check
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*
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* Tests if element details are initialized.
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*/
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/* FIXME: what about adding '&& (*__gst_reserved==NULL)' */
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#define GST_IS_ELEMENT_DETAILS(details) ( \
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(details) && ((details)->longname != NULL) && ((details)->klass != NULL) \
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&& ((details)->description != NULL) && ((details)->author != NULL))
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#define GST_TYPE_ELEMENT_FACTORY (gst_element_factory_get_type())
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#define GST_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ELEMENT_FACTORY,\
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GstElementFactory))
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#define GST_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ELEMENT_FACTORY,\
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GstElementFactoryClass))
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#define GST_IS_ELEMENT_FACTORY(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ELEMENT_FACTORY))
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#define GST_IS_ELEMENT_FACTORY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ELEMENT_FACTORY))
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#define GST_ELEMENT_FACTORY_CAST(obj) ((GstElementFactory *)(obj))
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/**
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* GstElementFactory:
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*
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* The opaque #GstElementFactory data structure.
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*/
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struct _GstElementFactory {
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GstPluginFeature parent;
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GType type; /* unique GType of element or 0 if not loaded */
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/* FIXME-0.11: deprecate this in favour of meta_data */
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GstElementDetails details;
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GList * staticpadtemplates; /* GstStaticPadTemplate list */
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guint numpadtemplates;
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/* URI interface stuff */
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guint uri_type;
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gchar ** uri_protocols;
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GList * interfaces; /* interface type names this element implements */
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/*< private >*/
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/* FIXME-0.11: move up and replace details */
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gpointer meta_data;
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gpointer _gst_reserved[GST_PADDING - 1];
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};
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struct _GstElementFactoryClass {
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GstPluginFeatureClass parent_class;
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gpointer _gst_reserved[GST_PADDING];
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};
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GType gst_element_factory_get_type (void);
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GstElementFactory * gst_element_factory_find (const gchar *name);
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GType gst_element_factory_get_element_type (GstElementFactory *factory);
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const gchar * gst_element_factory_get_longname (GstElementFactory *factory);
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const gchar * gst_element_factory_get_klass (GstElementFactory *factory);
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const gchar * gst_element_factory_get_description (GstElementFactory *factory);
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const gchar * gst_element_factory_get_author (GstElementFactory *factory);
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const gchar * gst_element_factory_get_documentation_uri (GstElementFactory *factory);
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const gchar * gst_element_factory_get_icon_name (GstElementFactory *factory);
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guint gst_element_factory_get_num_pad_templates (GstElementFactory *factory);
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const GList * gst_element_factory_get_static_pad_templates (GstElementFactory *factory);
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gint gst_element_factory_get_uri_type (GstElementFactory *factory);
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gchar ** gst_element_factory_get_uri_protocols (GstElementFactory *factory);
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gboolean gst_element_factory_has_interface (GstElementFactory *factory,
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const gchar *interfacename);
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GstElement* gst_element_factory_create (GstElementFactory *factory,
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const gchar *name) G_GNUC_MALLOC;
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GstElement* gst_element_factory_make (const gchar *factoryname, const gchar *name) G_GNUC_MALLOC;
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/* FIXME 0.11: move these two into our private headers */
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void __gst_element_factory_add_static_pad_template (GstElementFactory *elementfactory,
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GstStaticPadTemplate *templ);
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void __gst_element_factory_add_interface (GstElementFactory *elementfactory,
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const gchar *interfacename);
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gboolean gst_element_register (GstPlugin *plugin, const gchar *name,
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guint rank, GType type);
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/* Factory list functions */
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/**
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* GstFactoryListType:
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* @GST_ELEMENT_FACTORY_TYPE_DECODER: Decoder elements
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* @GST_ELEMENT_FACTORY_TYPE_ENCODER: Encoder elements
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* @GST_ELEMENT_FACTORY_TYPE_SINK: Sink elements
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* @GST_ELEMENT_FACTORY_TYPE_SRC: Source elements
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* @GST_ELEMENT_FACTORY_TYPE_MUXER: Muxer elements
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* @GST_ELEMENT_FACTORY_TYPE_DEMUXER: Demuxer elements
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* @GST_ELEMENT_FACTORY_TYPE_PARSER: Parser elements
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* @GST_ELEMENT_FACTORY_TYPE_PAYLOADER: Payloader elements
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* @GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER: Depayloader elements
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* @GST_ELEMENT_FACTORY_TYPE_MAX_ELEMENTS: Private, do not use
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* @GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO: Elements handling video media types
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* @GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO: Elements handling audio media types
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* @GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE: Elements handling image media types
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* @GST_ELEMENT_FACTORY_TYPE_MEDIA_SUBTITLE: Elements handling subtitle media types
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* @GST_ELEMENT_FACTORY_TYPE_MEDIA_METADATA: Elements handling metadata media types
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*
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* The type of #GstElementFactory to filter.
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*
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* All @GstFactoryListType up to @GST_ELEMENT_FACTORY_TYPE_MAX_ELEMENTS are exclusive.
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*
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* If one or more of the MEDIA types are specified, then only elements
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* matching the specified media types will be selected.
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*
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* Since: 0.10.31
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*/
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typedef guint64 GstElementFactoryListType;
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#define GST_ELEMENT_FACTORY_TYPE_DECODER (G_GUINT64_CONSTANT (1) << 0)
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#define GST_ELEMENT_FACTORY_TYPE_ENCODER (G_GUINT64_CONSTANT (1) << 1)
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#define GST_ELEMENT_FACTORY_TYPE_SINK (G_GUINT64_CONSTANT (1) << 2)
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#define GST_ELEMENT_FACTORY_TYPE_SRC (G_GUINT64_CONSTANT (1) << 3)
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#define GST_ELEMENT_FACTORY_TYPE_MUXER (G_GUINT64_CONSTANT (1) << 4)
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#define GST_ELEMENT_FACTORY_TYPE_DEMUXER (G_GUINT64_CONSTANT (1) << 5)
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#define GST_ELEMENT_FACTORY_TYPE_PARSER (G_GUINT64_CONSTANT (1) << 6)
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#define GST_ELEMENT_FACTORY_TYPE_PAYLOADER (G_GUINT64_CONSTANT (1) << 7)
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#define GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER (G_GUINT64_CONSTANT (1) << 8)
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#define GST_ELEMENT_FACTORY_TYPE_FORMATTER (G_GUINT64_CONSTANT (1) << 9)
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#define GST_ELEMENT_FACTORY_TYPE_MAX_ELEMENTS (G_GUINT64_CONSTANT (1) << 48)
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#define GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO (G_GUINT64_CONSTANT (1) << 49)
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#define GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO (G_GUINT64_CONSTANT (1) << 50)
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#define GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE (G_GUINT64_CONSTANT (1) << 51)
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#define GST_ELEMENT_FACTORY_TYPE_MEDIA_SUBTITLE (G_GUINT64_CONSTANT (1) << 52)
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#define GST_ELEMENT_FACTORY_TYPE_MEDIA_METADATA (G_GUINT64_CONSTANT (1) << 53)
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/**
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* GST_ELEMENT_FACTORY_TYPE_ANY:
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*
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* Elements of any of the defined GST_ELEMENT_FACTORY_LIST types
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*
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* Since: 0.10.31
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*/
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#define GST_ELEMENT_FACTORY_TYPE_ANY ((G_GUINT64_CONSTANT (1) << 49) - 1)
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/**
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* GST_ELEMENT_FACTORY_TYPE_MEDIA_ANY:
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*
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* Elements matching any of the defined GST_ELEMENT_FACTORY_TYPE_MEDIA types
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*
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* Note: Do not use this if you wish to not filter against any of the defined
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* media types. If you wish to do this, simply don't specify any
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* GST_ELEMENT_FACTORY_TYPE_MEDIA flag.
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*
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* Since: 0.10.31
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*/
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#define GST_ELEMENT_FACTORY_TYPE_MEDIA_ANY (~G_GUINT64_CONSTANT (0) << 48)
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/**
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* GST_ELEMENT_FACTORY_TYPE_VIDEO_ENCODER:
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*
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* All encoders handling video or image media types
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*
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* Since: 0.10.31
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*/
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#define GST_ELEMENT_FACTORY_TYPE_VIDEO_ENCODER (GST_ELEMENT_FACTORY_TYPE_ENCODER | GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO | GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE)
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/**
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* GST_ELEMENT_FACTORY_TYPE_AUDIO_ENCODER:
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*
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* All encoders handling audio media types
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*
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* Since: 0.10.31
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*/
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#define GST_ELEMENT_FACTORY_TYPE_AUDIO_ENCODER (GST_ELEMENT_FACTORY_TYPE_ENCODER | GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO)
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/**
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* GST_ELEMENT_FACTORY_TYPE_AUDIOVIDEO_SINKS:
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*
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* All sinks handling audio, video or image media types
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*
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* Since: 0.10.31
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*/
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#define GST_ELEMENT_FACTORY_TYPE_AUDIOVIDEO_SINKS (GST_ELEMENT_FACTORY_TYPE_SINK | GST_ELEMENT_FACTORY_TYPE_MEDIA_AUDIO | GST_ELEMENT_FACTORY_TYPE_MEDIA_VIDEO | GST_ELEMENT_FACTORY_TYPE_MEDIA_IMAGE)
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/**
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* GST_ELEMENT_FACTORY_TYPE_DECODABLE:
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*
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* All elements used to 'decode' streams (decoders, demuxers, parsers, depayloaders)
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*
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* Since: 0.10.31
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*/
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#define GST_ELEMENT_FACTORY_TYPE_DECODABLE \
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(GST_ELEMENT_FACTORY_TYPE_DECODER | GST_ELEMENT_FACTORY_TYPE_DEMUXER | GST_ELEMENT_FACTORY_TYPE_DEPAYLOADER | GST_ELEMENT_FACTORY_TYPE_PARSER)
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/* Element klass defines */
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#define GST_ELEMENT_FACTORY_KLASS_DECODER "Decoder"
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#define GST_ELEMENT_FACTORY_KLASS_ENCODER "Encoder"
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#define GST_ELEMENT_FACTORY_KLASS_SINK "Sink"
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#define GST_ELEMENT_FACTORY_KLASS_SRC "Source"
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#define GST_ELEMENT_FACTORY_KLASS_MUXER "Muxer"
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#define GST_ELEMENT_FACTORY_KLASS_DEMUXER "Demuxer"
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#define GST_ELEMENT_FACTORY_KLASS_PARSER "Parser"
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#define GST_ELEMENT_FACTORY_KLASS_PAYLOADER "Payloader"
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#define GST_ELEMENT_FACTORY_KLASS_DEPAYLOADER "Depayloader"
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#define GST_ELEMENT_FACTORY_KLASS_FORMATTER "Formatter"
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#define GST_ELEMENT_FACTORY_KLASS_MEDIA_VIDEO "Video"
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#define GST_ELEMENT_FACTORY_KLASS_MEDIA_AUDIO "Audio"
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#define GST_ELEMENT_FACTORY_KLASS_MEDIA_IMAGE "Image"
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#define GST_ELEMENT_FACTORY_KLASS_MEDIA_SUBTITLE "Subtitle"
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#define GST_ELEMENT_FACTORY_KLASS_MEDIA_METADATA "Metadata"
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gboolean gst_element_factory_list_is_type (GstElementFactory *factory,
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GstElementFactoryListType type);
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GList * gst_element_factory_list_get_elements (GstElementFactoryListType type,
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GstRank minrank) G_GNUC_MALLOC;
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GList * gst_element_factory_list_filter (GList *list, const GstCaps *caps,
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GstPadDirection direction,
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gboolean subsetonly) G_GNUC_MALLOC;
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G_END_DECLS
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#endif /* __GST_ELEMENT_FACTORY_H__ */
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