mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-28 19:20:35 +00:00
ecd88e381d
Original commit message from CVS: Revert again, this time without post-commit reindent hooks to put back the indentation :-)
178 lines
3.9 KiB
Text
178 lines
3.9 KiB
Text
<!-- ##### SECTION Title ##### -->
|
|
GstPadTemplate
|
|
|
|
<!-- ##### SECTION Short_Description ##### -->
|
|
Describe the media type of a pad.
|
|
|
|
<!-- ##### SECTION Long_Description ##### -->
|
|
<para>
|
|
Padtemplates describe the possible media types a pad or an elementfactory can
|
|
handle.
|
|
</para>
|
|
<para>
|
|
Pad and PadTemplates have #GstCaps attached to it to describe the media type they
|
|
are capable of dealing with. gst_pad_template_get_caps() is used to get the
|
|
caps of a padtemplate. It's not possible to modify the caps of a padtemplate after
|
|
creation.
|
|
</para>
|
|
<para>
|
|
Padtemplates can be created with gst_pad_template_new() or with the convenient
|
|
GST_PAD_TEMPLATE_FACTORY() macro. A padtemplate can be used to create a pad or
|
|
to add to an elementfactory.
|
|
</para>
|
|
<para>
|
|
The following code example shows the code to create a pad from a padtemplate.
|
|
<programlisting>
|
|
GstStaticPadTemplate my_template =
|
|
GST_STATIC_PAD_TEMPLATE (
|
|
"sink", /* the name of the pad */
|
|
GST_PAD_SINK, /* the direction of the pad */
|
|
GST_PAD_ALWAYS, /* when this pad will be present */
|
|
GST_STATIC_CAPS ( /* the capabilities of the padtemplate */
|
|
"audio/x-raw-int, "
|
|
"channels = (int) [ 1, 6 ]"
|
|
)
|
|
)
|
|
|
|
void
|
|
my_method (void)
|
|
{
|
|
GstPad *pad;
|
|
|
|
pad = gst_pad_new_from_template (GST_PAD_TEMPLATE_GET (my_template_factory), "sink");
|
|
...
|
|
}
|
|
</programlisting>
|
|
</para>
|
|
<para>
|
|
The following example shows you how to add the padtemplate to an elementfactory:
|
|
<programlisting>
|
|
gboolean
|
|
my_factory_init (GstPlugin *plugin)
|
|
{
|
|
GstElementFactory *factory;
|
|
|
|
factory = gst_element_factory_new ("my_factory", GST_TYPE_MYFACTORY, &gst_myfactory_details);
|
|
g_return_val_if_fail (factory != NULL, FALSE);
|
|
|
|
gst_element_factory_add_pad_template (factory, GST_PAD_TEMPLATE_GET (my_template_factory));
|
|
|
|
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
</programlisting>
|
|
</para>
|
|
|
|
<!-- ##### SECTION See_Also ##### -->
|
|
<para>
|
|
#GstPad, #GstElementFactory
|
|
</para>
|
|
|
|
<!-- ##### ENUM GstPadPresence ##### -->
|
|
<para>
|
|
Indicates when this pad will become available.
|
|
</para>
|
|
|
|
@GST_PAD_ALWAYS: the pad is always available
|
|
@GST_PAD_SOMETIMES: the pad will become available depending on the media stream
|
|
@GST_PAD_REQUEST: th pad is only available on request with
|
|
gst_element_request_pad_by_name() or gst_element_request_compatible_pad().
|
|
|
|
<!-- ##### STRUCT GstPadTemplate ##### -->
|
|
<para>
|
|
The padtemplate object.
|
|
</para>
|
|
|
|
|
|
<!-- ##### ENUM GstPadTemplateFlags ##### -->
|
|
<para>
|
|
Flags for the padtemplate
|
|
</para>
|
|
|
|
@GST_PAD_TEMPLATE_FIXED: The padtemplate has no variable properties
|
|
@GST_PAD_TEMPLATE_FLAG_LAST: first flag that can be used by subclasses.
|
|
|
|
<!-- ##### MACRO GST_PAD_TEMPLATE_CAPS ##### -->
|
|
<para>
|
|
Get a handle to the padtemplate #GstCaps
|
|
</para>
|
|
|
|
@templ: the template to query
|
|
|
|
|
|
<!-- ##### MACRO GST_PAD_TEMPLATE_DIRECTION ##### -->
|
|
<para>
|
|
Get the direction of the padtemplate.
|
|
</para>
|
|
|
|
@templ: the template to query
|
|
|
|
|
|
<!-- ##### MACRO GST_PAD_TEMPLATE_NAME_TEMPLATE ##### -->
|
|
<para>
|
|
Get the nametemplate of the padtemplate.
|
|
</para>
|
|
|
|
@templ: the template to query
|
|
|
|
|
|
<!-- ##### MACRO GST_PAD_TEMPLATE_PRESENCE ##### -->
|
|
<para>
|
|
Get the presence of the padtemplate.
|
|
</para>
|
|
|
|
@templ: the template to query
|
|
|
|
|
|
<!-- ##### MACRO GST_PAD_TEMPLATE_IS_FIXED ##### -->
|
|
<para>
|
|
Check if the properties of the padtemplate are fixed
|
|
</para>
|
|
|
|
@templ: the template to query
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_template_new ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@name_template:
|
|
@direction:
|
|
@presence:
|
|
@caps:
|
|
@Returns:
|
|
<!-- # Unused Parameters # -->
|
|
@Varargs:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_template_get_caps ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@templ:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### FUNCTION gst_pad_template_get_caps_by_name ##### -->
|
|
<para>
|
|
|
|
</para>
|
|
|
|
@templ:
|
|
@name:
|
|
@Returns:
|
|
|
|
|
|
<!-- ##### SIGNAL GstPadTemplate::pad-created ##### -->
|
|
<para>
|
|
This signal is fired when an element creates a pad from this
|
|
template.
|
|
</para>
|
|
|
|
@gstpadtemplate: the object which received the signal.
|
|
@arg1: The pad that was created.
|
|
|