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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>gsttagxmp</title>
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<th width="100%" align="center">GStreamer Base Plugins 1.0 Library Reference Manual</th>
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<a href="#gst-plugins-base-libs-gsttagxmp.synopsis" class="shortcut">Top</a>
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<a href="#gst-plugins-base-libs-gsttagxmp.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="gst-plugins-base-libs-gsttagxmp"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gsttagxmp.top_of_page"></a>gsttagxmp</span></h2>
<p>gsttagxmp — tag mappings and support functions for plugins
dealing with xmp packets</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gsttagxmp.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/tag/tag.h>
<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#GstTagList"><span class="returnvalue">GstTagList</span></a> * <a class="link" href="gst-plugins-base-libs-gsttagxmp.html#gst-tag-list-from-xmp-buffer" title="gst_tag_list_from_xmp_buffer ()">gst_tag_list_from_xmp_buffer</a> (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);
<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * <a class="link" href="gst-plugins-base-libs-gsttagxmp.html#gst-tag-list-to-xmp-buffer" title="gst_tag_list_to_xmp_buffer ()">gst_tag_list_to_xmp_buffer</a> (<em class="parameter"><code>const <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a> *list</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> read_only</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **schemas</code></em>);
const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> ** <a class="link" href="gst-plugins-base-libs-gsttagxmp.html#gst-tag-xmp-list-schemas" title="gst_tag_xmp_list_schemas ()">gst_tag_xmp_list_schemas</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gsttagxmp.description"></a><h2>Description</h2>
<p>
Contains various utility functions for plugins to parse or create
xmp packets and map them to and from <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a>s.
</p>
<p>
Please note that the xmp parser is very lightweight and not strict at all.
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gsttagxmp.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="gst-tag-list-from-xmp-buffer"></a><h3>gst_tag_list_from_xmp_buffer ()</h3>
<pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#GstTagList"><span class="returnvalue">GstTagList</span></a> * gst_tag_list_from_xmp_buffer (<em class="parameter"><code><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>
Parse a xmp packet into a taglist.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>buffer</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>new taglist or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, free the list when done</td>
</tr>
</tbody>
</table></div>
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<hr>
<div class="refsect2">
<a name="gst-tag-list-to-xmp-buffer"></a><h3>gst_tag_list_to_xmp_buffer ()</h3>
<pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * gst_tag_list_to_xmp_buffer (<em class="parameter"><code>const <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a> *list</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> read_only</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **schemas</code></em>);</pre>
<p>
Formats a taglist as a xmp packet using only the selected
schemas. An empty list (<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>) means that all schemas should
be used
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<td><p><span class="term"><em class="parameter"><code>list</code></em> :</span></p></td>
<td>tags</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>read_only</code></em> :</span></p></td>
<td>does the container forbid inplace editing</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>schemas</code></em> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> terminated array of schemas to be used on serialization</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>new buffer or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, unref the buffer when done</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-xmp-list-schemas"></a><h3>gst_tag_xmp_list_schemas ()</h3>
<pre class="programlisting">const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> ** gst_tag_xmp_list_schemas (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Gets the list of supported schemas in the xmp lib
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> terminated array of strings with the
schema names. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr></tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gsttagxmp.see-also"></a><h2>See Also</h2>
<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a>
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