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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>GstPadTemplate: GStreamer 1.0 Core Reference Manual</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="home" href="index.html" title="GStreamer 1.0 Core Reference Manual">
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<link rel="up" href="libgstreamer.html" title="GStreamer Core Library">
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<link rel="prev" href="GstPad.html" title="GstPad">
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<link rel="stylesheet" href="style.css" type="text/css">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top |
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Description |
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Object Hierarchy |
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Properties |
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Signals
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GstPadTemplate
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GstPadTemplate — Describe the media type of a pad.
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Functions
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#define
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GST_STATIC_PAD_TEMPLATE()
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GstPadTemplate *
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gst_static_pad_template_get ()
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GstCaps *
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gst_static_pad_template_get_caps ()
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#define
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GST_PAD_TEMPLATE_NAME_TEMPLATE()
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#define
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GST_PAD_TEMPLATE_DIRECTION()
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#define
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GST_PAD_TEMPLATE_PRESENCE()
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#define
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GST_PAD_TEMPLATE_CAPS()
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#define
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GST_PAD_TEMPLATE_IS_FIXED()
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#define
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GST_PAD_TEMPLATE_GTYPE()
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GstPadTemplate *
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gst_pad_template_new ()
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GstPadTemplate *
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gst_pad_template_new_from_static_pad_template_with_gtype ()
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GstCaps *
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gst_pad_template_get_caps ()
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Properties
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GstCaps *
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caps
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Read / Write / Construct Only
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GstPadDirection
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direction
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Read / Write / Construct Only
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GType *
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gtype
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Read / Write / Construct Only
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gchar *
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name-template
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Read / Write / Construct Only
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GstPadPresence
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presence
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Read / Write / Construct Only
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Signals
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void
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pad-created
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Run Last
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Types and Values
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struct
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GstStaticPadTemplate
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struct
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GstPadTemplate
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enum
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GstPadTemplateFlags
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enum
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GstPadPresence
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Object Hierarchy
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GObject
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╰── GInitiallyUnowned
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╰── GstObject
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╰── GstPadTemplate
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Includes
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#include <gst/gst.h>
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Description
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Padtemplates describe the possible media types a pad or an elementfactory can
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handle. This allows for both inspection of handled types before loading the
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element plugin as well as identifying pads on elements that are not yet
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created (request or sometimes pads).
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Pad and PadTemplates have GstCaps attached to it to describe the media type
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they are capable of dealing with. gst_pad_template_get_caps() or
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GST_PAD_TEMPLATE_CAPS() are used to get the caps of a padtemplate. It's not
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possible to modify the caps of a padtemplate after creation.
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PadTemplates have a GstPadPresence property which identifies the lifetime
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of the pad and that can be retrieved with GST_PAD_TEMPLATE_PRESENCE(). Also
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the direction of the pad can be retrieved from the GstPadTemplate with
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GST_PAD_TEMPLATE_DIRECTION().
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The GST_PAD_TEMPLATE_NAME_TEMPLATE() is important for GST_PAD_REQUEST pads
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because it has to be used as the name in the gst_element_get_request_pad()
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call to instantiate a pad from this template.
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Padtemplates can be created with gst_pad_template_new() or with
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gst_static_pad_template_get(), which creates a GstPadTemplate from a
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GstStaticPadTemplate that can be filled with the
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convenient GST_STATIC_PAD_TEMPLATE() macro.
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A padtemplate can be used to create a pad (see gst_pad_new_from_template()
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or gst_pad_new_from_static_template()) or to add to an element class
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(see gst_element_class_add_static_pad_template()).
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The following code example shows the code to create a pad from a padtemplate.
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GstStaticPadTemplate my_template =
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GST_STATIC_PAD_TEMPLATE (
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"sink", // the name of the pad
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GST_PAD_SINK, // the direction of the pad
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GST_PAD_ALWAYS, // when this pad will be present
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GST_STATIC_CAPS ( // the capabilities of the padtemplate
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"audio/x-raw, "
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"channels = (int) [ 1, 6 ]"
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)
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);
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void
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my_method (void)
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{
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GstPad *pad;
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pad = gst_pad_new_from_static_template (&my_template, "sink");
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...
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}
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The following example shows you how to add the padtemplate to an
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element class, this is usually done in the class_init of the class:
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static void
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my_element_class_init (GstMyElementClass *klass)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_static_pad_template (gstelement_class, &my_template);
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}
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Functions
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GST_STATIC_PAD_TEMPLATE()
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#define GST_STATIC_PAD_TEMPLATE(padname, dir, pres, caps)
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Convenience macro to fill the values of a GstStaticPadTemplate
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structure.
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Parameters
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padname
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the name template of the pad
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dir
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the GstPadDirection of the pad
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pres
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the GstPadPresence of the pad
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caps
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the GstStaticCaps of the pad
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gst_static_pad_template_get ()
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963350 |
GstPadTemplate *
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963350 |
gst_static_pad_template_get (GstStaticPadTemplate *pad_template);
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963350 |
Converts a GstStaticPadTemplate into a GstPadTemplate.
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Parameters
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pad_template
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963350 |
the static pad template
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963350 |
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963350 |
Returns
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Packit Service |
963350 |
a new GstPadTemplate.
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963350 |
[transfer floating][nullable]
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963350 |
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963350 |
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963350 |
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963350 |
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963350 |
gst_static_pad_template_get_caps ()
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963350 |
GstCaps *
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963350 |
gst_static_pad_template_get_caps (GstStaticPadTemplate *templ);
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963350 |
Gets the capabilities of the static pad template.
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963350 |
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963350 |
Parameters
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templ
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963350 |
a GstStaticPadTemplate to get capabilities of.
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Returns
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963350 |
the GstCaps of the static pad template.
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963350 |
Unref after usage. Since the core holds an additional
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963350 |
ref to the returned caps, use gst_caps_make_writable()
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963350 |
on the returned caps to modify it.
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963350 |
[transfer full]
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963350 |
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963350 |
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963350 |
GST_PAD_TEMPLATE_NAME_TEMPLATE()
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963350 |
#define GST_PAD_TEMPLATE_NAME_TEMPLATE(templ) (((GstPadTemplate *)(templ))->name_template)
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963350 |
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963350 |
Get the nametemplate of the padtemplate.
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Parameters
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templ
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the template to query
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GST_PAD_TEMPLATE_DIRECTION()
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963350 |
#define GST_PAD_TEMPLATE_DIRECTION(templ) (((GstPadTemplate *)(templ))->direction)
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963350 |
Get the GstPadDirection of the padtemplate.
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Parameters
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templ
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the template to query
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GST_PAD_TEMPLATE_PRESENCE()
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#define GST_PAD_TEMPLATE_PRESENCE(templ) (((GstPadTemplate *)(templ))->presence)
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963350 |
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963350 |
Get the GstPadPresence of the padtemplate.
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963350 |
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963350 |
Parameters
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templ
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the template to query
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963350 |
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GST_PAD_TEMPLATE_CAPS()
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963350 |
#define GST_PAD_TEMPLATE_CAPS(templ) (((GstPadTemplate *)(templ))->caps)
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963350 |
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963350 |
Get a handle to the padtemplate GstCaps
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963350 |
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963350 |
Parameters
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templ
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the template to query
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GST_PAD_TEMPLATE_IS_FIXED()
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963350 |
#define GST_PAD_TEMPLATE_IS_FIXED(templ) (GST_OBJECT_FLAG_IS_SET(templ, GST_PAD_TEMPLATE_FIXED))
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Check if the properties of the padtemplate are fixed
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Parameters
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templ
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the template to query
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GST_PAD_TEMPLATE_GTYPE()
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963350 |
#define GST_PAD_TEMPLATE_GTYPE(templ) (((GstPadTemplate *)(templ))->ABI.abi.gtype)
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963350 |
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963350 |
Get the GType of the padtemplate
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Parameters
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templ
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the template to query
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963350 |
Since: 1.14
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963350 |
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963350 |
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963350 |
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963350 |
gst_pad_template_new ()
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963350 |
GstPadTemplate *
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963350 |
gst_pad_template_new (const gchar *name_template,
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963350 |
GstPadDirection direction,
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963350 |
GstPadPresence presence,
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963350 |
GstCaps *caps);
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963350 |
Creates a new pad template with a name according to the given template
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963350 |
and with the given arguments.
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963350 |
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Parameters
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name_template
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the name template.
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963350 |
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963350 |
direction
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963350 |
the GstPadDirection of the template.
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963350 |
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963350 |
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963350 |
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963350 |
presence
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the GstPadPresence of the pad.
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963350 |
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963350 |
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963350 |
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963350 |
caps
|
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963350 |
a GstCaps set for the template.
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963350 |
[transfer none]
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963350 |
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963350 |
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963350 |
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963350 |
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963350 |
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Packit Service |
963350 |
Returns
|
|
Packit Service |
963350 |
a new GstPadTemplate.
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Packit Service |
963350 |
[transfer floating][nullable]
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Packit Service |
963350 |
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963350 |
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963350 |
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963350 |
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963350 |
gst_pad_template_new_from_static_pad_template_with_gtype ()
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963350 |
GstPadTemplate *
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963350 |
gst_pad_template_new_from_static_pad_template_with_gtype
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963350 |
(GstStaticPadTemplate *pad_template,
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963350 |
GType pad_type);
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963350 |
Converts a GstStaticPadTemplate into a GstPadTemplate with a type.
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963350 |
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963350 |
Parameters
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963350 |
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963350 |
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pad_template
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963350 |
the static pad template
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963350 |
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963350 |
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963350 |
pad_type
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963350 |
The GType of the pad to create
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963350 |
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963350 |
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963350 |
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963350 |
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963350 |
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963350 |
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963350 |
Returns
|
|
Packit Service |
963350 |
a new GstPadTemplate.
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963350 |
[transfer floating]
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963350 |
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963350 |
Since: 1.14
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963350 |
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963350 |
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963350 |
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963350 |
gst_pad_template_get_caps ()
|
|
Packit Service |
963350 |
GstCaps *
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|
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963350 |
gst_pad_template_get_caps (GstPadTemplate *templ);
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963350 |
Gets the capabilities of the pad template.
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963350 |
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963350 |
Parameters
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963350 |
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963350 |
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963350 |
templ
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963350 |
a GstPadTemplate to get capabilities of.
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963350 |
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963350 |
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963350 |
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963350 |
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963350 |
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Packit Service |
963350 |
Returns
|
|
Packit Service |
963350 |
the GstCaps of the pad template.
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Packit Service |
963350 |
Unref after usage.
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Packit Service |
963350 |
[transfer full]
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963350 |
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963350 |
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963350 |
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963350 |
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963350 |
Types and Values
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963350 |
|
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963350 |
struct GstStaticPadTemplate
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963350 |
struct GstStaticPadTemplate {
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963350 |
const gchar *name_template;
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963350 |
GstPadDirection direction;
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963350 |
GstPadPresence presence;
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963350 |
GstStaticCaps static_caps;
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|
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963350 |
};
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963350 |
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963350 |
Structure describing the GstStaticPadTemplate.
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963350 |
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963350 |
Members
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963350 |
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963350 |
const gchar *name_template;
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|
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963350 |
the name of the template
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963350 |
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963350 |
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963350 |
GstPadDirection direction;
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963350 |
the direction of the template
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963350 |
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963350 |
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963350 |
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963350 |
GstPadPresence presence;
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|
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963350 |
the presence of the template
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963350 |
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963350 |
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963350 |
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963350 |
GstStaticCaps static_caps;
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|
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963350 |
the caps of the template.
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963350 |
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963350 |
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963350 |
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963350 |
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963350 |
struct GstPadTemplate
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963350 |
struct GstPadTemplate;
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|
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963350 |
The padtemplate object.
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963350 |
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963350 |
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963350 |
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963350 |
enum GstPadTemplateFlags
|
|
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963350 |
Flags for the padtemplate
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963350 |
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963350 |
Members
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963350 |
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963350 |
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963350 |
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963350 |
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963350 |
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963350 |
GST_PAD_TEMPLATE_FLAG_LAST
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963350 |
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963350 |
first flag that can be used by subclasses.
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963350 |
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963350 |
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963350 |
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963350 |
|
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963350 |
enum GstPadPresence
|
|
Packit Service |
963350 |
Indicates when this pad will become available.
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|
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Members
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GST_PAD_ALWAYS
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the pad is always available
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GST_PAD_SOMETIMES
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the pad will become available depending on the media stream
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GST_PAD_REQUEST
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the pad is only available on request with
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gst_element_request_pad().
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Property Details
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The “caps” property
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“caps” GstCaps *
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The capabilities of the pad described by the pad template.
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Flags: Read / Write / Construct Only
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The “direction” property
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“direction” GstPadDirection
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The direction of the pad described by the pad template.
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Flags: Read / Write / Construct Only
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Default value: GST_PAD_UNKNOWN
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The “gtype” property
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“gtype” GType *
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The type of the pad described by the pad template.
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Flags: Read / Write / Construct Only
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Allowed values: void
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Since: 1.14
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The “name-template” property
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“name-template” gchar *
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The name template of the pad template.
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Flags: Read / Write / Construct Only
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Default value: NULL
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The “presence” property
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“presence” GstPadPresence
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When the pad described by the pad template will become available.
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Flags: Read / Write / Construct Only
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Default value: GST_PAD_ALWAYS
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Signal Details
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The “pad-created” signal
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void
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user_function (GstPadTemplate *pad_template,
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GstPad *pad,
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gpointer user_data)
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This signal is fired when an element creates a pad from this template.
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Parameters
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pad_template
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the object which received the signal.
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pad
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the pad that was created.
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user_data
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user data set when the signal handler was connected.
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Flags: Run Last
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See Also
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GstPad, GstElementFactory
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Generated by GTK-Doc V1.27
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