gstreamer/docs/manual/links-api.xml
Thomas Vander Stichele abe422b141 reorganizing manual so that concepts are explained before code is shown.
Original commit message from CVS:
reorganizing manual so that concepts are explained before code is shown.
needs some proofreading, will get to it.
2003-12-29 14:15:02 +00:00

79 lines
2 KiB
XML

<chapter id="cha-links-api">
<title>Linking elements</title>
<sect1 id="sec-link-basic">
<title>Making simple links</title>
<para>
You can link two pads with:
</para>
<programlisting>
GstPad *srcpad, *sinkpad;
srcpad = gst_element_get_pad (element1, "src");
sinpad = gst_element_get_pad (element2, "sink");
// link them
gst_pad_link (srcpad, sinkpad);
....
// and unlink them
gst_pad_unlink (srcpad, sinkpad);
</programlisting>
<para>
A convenient shortcut for the above code is done with the gst_element_link_pads ()
function:
</para>
<programlisting>
// link them
gst_element_link_pads (element1, "src", element2, "sink");
....
// and unlink them
gst_element_unlink_pads (element1, "src", element2, "sink");
</programlisting>
<para>
An even more convenient shortcut for single-source, single-sink elements is the
gst_element_link () function:
</para>
<programlisting>
// link them
gst_element_link (element1, element2);
....
// and unlink them
gst_element_unlink (element1, element2);
</programlisting>
<para>
If you have more than one element to link, the gst_element_link_many () function takes
a NULL-terminated list of elements:
</para>
<programlisting>
// link them
gst_element_link_many (element1, element2, element3, element4, NULL);
....
// and unlink them
gst_element_unlink_many (element1, element2, element3, element4, NULL);
</programlisting>
<para>
You can query if a pad is linked with GST_PAD_IS_LINKED (pad).
</para>
<para>
To query for the <classname>GstPad</classname> a pad is linked to, use
gst_pad_get_peer (pad).
</para>
</sect1>
<sect1 id="sec-link-filtered">
<title>Making filtered links</title>
<para>
You can also force a specific media type on the link by using gst_pad_link_filtered ()
and gst_element_link_filtered () with capabilities.
See <xref linkend="sec-caps"/> for
an explanation of capabilities.
</para>
</sect1>
</chapter>