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<a href="#gst-plugins-base-libs-gsttagexif.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="gst-plugins-base-libs-gsttagexif"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gsttagexif.top_of_page"></a>gsttagexif</span></h2>
<p>gsttagexif — tag mappings and support functions for plugins
dealing with exif tags</p>
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<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gsttagexif.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/tag/tag.h>
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * <a class="link" href="gst-plugins-base-libs-gsttagexif.html#gst-tag-list-to-exif-buffer" title="gst_tag_list_to_exif_buffer ()">gst_tag_list_to_exif_buffer</a> (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a> *taglist</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> byte_order</code></em>,
<em class="parameter"><code><span class="type">guint32</span> base_offset</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * <a class="link" href="gst-plugins-base-libs-gsttagexif.html#gst-tag-list-to-exif-buffer-with-tiff-header" title="gst_tag_list_to_exif_buffer_with_tiff_header ()">gst_tag_list_to_exif_buffer_with_tiff_header</a>
(<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a> *taglist</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTagList.html#GstTagList"><span class="returnvalue">GstTagList</span></a> * <a class="link" href="gst-plugins-base-libs-gsttagexif.html#gst-tag-list-from-exif-buffer" title="gst_tag_list_from_exif_buffer ()">gst_tag_list_from_exif_buffer</a> (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> byte_order</code></em>,
<em class="parameter"><code><span class="type">guint32</span> base_offset</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTagList.html#GstTagList"><span class="returnvalue">GstTagList</span></a> * <a class="link" href="gst-plugins-base-libs-gsttagexif.html#gst-tag-list-from-exif-buffer-with-tiff-header" title="gst_tag_list_from_exif_buffer_with_tiff_header ()">gst_tag_list_from_exif_buffer_with_tiff_header</a>
(<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gsttagexif.description"></a><h2>Description</h2>
<p>
Contains utility function to parse <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a>s from exif
buffers and to create exif buffers from <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a>s
</p>
<p>
Note that next IFD fields on the created exif buffers are set to 0.
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gsttagexif.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="gst-tag-list-to-exif-buffer"></a><h3>gst_tag_list_to_exif_buffer ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * gst_tag_list_to_exif_buffer (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a> *taglist</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> byte_order</code></em>,
<em class="parameter"><code><span class="type">guint32</span> base_offset</code></em>);</pre>
<p>
Formats the tags in taglist on exif format. The resulting buffer contains
the tags IFD and is followed by the data pointed by the tag entries.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>taglist</code></em> :</span></p></td>
<td>The taglist</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>byte_order</code></em> :</span></p></td>
<td>byte order used in writing (G_LITTLE_ENDIAN or G_BIG_ENDIAN)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>base_offset</code></em> :</span></p></td>
<td>Offset from the tiff header first byte</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A GstBuffer containing the tag entries followed by the tag data</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.30</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-list-to-exif-buffer-with-tiff-header"></a><h3>gst_tag_list_to_exif_buffer_with_tiff_header ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * gst_tag_list_to_exif_buffer_with_tiff_header
(<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a> *taglist</code></em>);</pre>
<p>
Formats the tags in taglist into exif structure, a tiff header
is put in the beginning of the buffer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>taglist</code></em> :</span></p></td>
<td>The taglist</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A GstBuffer containing the data</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.30</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-list-from-exif-buffer"></a><h3>gst_tag_list_from_exif_buffer ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTagList.html#GstTagList"><span class="returnvalue">GstTagList</span></a> * gst_tag_list_from_exif_buffer (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> byte_order</code></em>,
<em class="parameter"><code><span class="type">guint32</span> base_offset</code></em>);</pre>
<p>
Parses the IFD and IFD tags data contained in the buffer and puts it
on a taglist. The base_offset is used to subtract from the offset in
the tag entries and be able to get the offset relative to the buffer
start
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>The exif buffer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>byte_order</code></em> :</span></p></td>
<td>byte order of the data</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>base_offset</code></em> :</span></p></td>
<td>Offset from the tiff header to this buffer</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The parsed taglist</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.30</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-tag-list-from-exif-buffer-with-tiff-header"></a><h3>gst_tag_list_from_exif_buffer_with_tiff_header ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTagList.html#GstTagList"><span class="returnvalue">GstTagList</span></a> * gst_tag_list_from_exif_buffer_with_tiff_header
(<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>
Parses the exif tags starting with a tiff header structure.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>The exif buffer</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The taglist</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.30</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gsttagexif.see-also"></a><h2>See Also</h2>
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a>
</div>
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