docs/libs/html/gst-plugins-base-libs-gsttagexif.html

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  24 <a href="#gst-plugins-base-libs-gsttagexif.synopsis" class="shortcut">Top</a>
  25                    |
  26                   <a href="#gst-plugins-base-libs-gsttagexif.description" class="shortcut">Description</a>
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  29 <div class="refentry">
  30 <a name="gst-plugins-base-libs-gsttagexif"></a><div class="titlepage"></div>
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  32 <td valign="top">
  33 <h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gsttagexif.top_of_page"></a>gsttagexif</span></h2>
  34 <p>gsttagexif — tag mappings and support functions for plugins
  35                     dealing with exif tags</p>
  36 </td>
  37 <td valign="top" align="right"></td>
  38 </tr></table></div>
  39 <div class="refsynopsisdiv">
  40 <a name="gst-plugins-base-libs-gsttagexif.synopsis"></a><h2>Synopsis</h2>
  41 <pre class="synopsis">
  42 #include &lt;gst/tag/tag.h&gt;
  43
  44 <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-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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a> *taglist</code></em>,
  45                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> byte_order</code></em>,
  46                                                          <em class="parameter"><code><span class="type">guint32</span> base_offset</code></em>);
  47 <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-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>
  48                                                         (<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> *taglist</code></em>);
  49 <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-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="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
  50                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> byte_order</code></em>,
  51                                                          <em class="parameter"><code><span class="type">guint32</span> base_offset</code></em>);
  52 <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-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>
  53                                                         (<em class="parameter"><code>const <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>);
  54 </pre>
  55 </div>
  56 <div class="refsect1">
  57 <a name="gst-plugins-base-libs-gsttagexif.description"></a><h2>Description</h2>
  58 <p>
  59 Contains utility function to parse <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a>s from exif
  60 buffers and to create exif buffers from <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a>s
  61 </p>
  62 <p>
  63 Note that next IFD fields on the created exif buffers are set to 0.
  64 </p>
  65 </div>
  66 <div class="refsect1">
  67 <a name="gst-plugins-base-libs-gsttagexif.details"></a><h2>Details</h2>
  68 <div class="refsect2">
  69 <a name="gst-tag-list-to-exif-buffer"></a><h3>gst_tag_list_to_exif_buffer ()</h3>
  70 <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_exif_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> *taglist</code></em>,
  71                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> byte_order</code></em>,
  72                                                          <em class="parameter"><code><span class="type">guint32</span> base_offset</code></em>);</pre>
  73 <p>
  74 Formats the tags in taglist on exif format. The resulting buffer contains
  75 the tags IFD and is followed by the data pointed by the tag entries.
  76 </p>
  77 <div class="variablelist"><table border="0">
  78 <col align="left" valign="top">
  79 <tbody>
  80 <tr>
  81 <td><p><span class="term"><em class="parameter"><code>taglist</code></em> :</span></p></td>
  82 <td>The taglist</td>
  83 </tr>
  84 <tr>
  85 <td><p><span class="term"><em class="parameter"><code>byte_order</code></em> :</span></p></td>
  86 <td>byte order used in writing (G_LITTLE_ENDIAN or G_BIG_ENDIAN)</td>
  87 </tr>
  88 <tr>
  89 <td><p><span class="term"><em class="parameter"><code>base_offset</code></em> :</span></p></td>
  90 <td>Offset from the tiff header first byte</td>
  91 </tr>
  92 <tr>
  93 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
  94 <td>A GstBuffer containing the tag entries followed by the tag data</td>
  95 </tr>
  96 </tbody>
  97 </table></div>
  98 <p class="since">Since 0.10.30</p>
  99 </div>
 100 <hr>
 101 <div class="refsect2">
 102 <a name="gst-tag-list-to-exif-buffer-with-tiff-header"></a><h3>gst_tag_list_to_exif_buffer_with_tiff_header ()</h3>
 103 <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_exif_buffer_with_tiff_header
 104                                                         (<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> *taglist</code></em>);</pre>
 105 <p>
 106 Formats the tags in taglist into exif structure, a tiff header
 107 is put in the beginning of the buffer.
 108 </p>
 109 <div class="variablelist"><table border="0">
 110 <col align="left" valign="top">
 111 <tbody>
 112 <tr>
 113 <td><p><span class="term"><em class="parameter"><code>taglist</code></em> :</span></p></td>
 114 <td>The taglist</td>
 115 </tr>
 116 <tr>
 117 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 118 <td>A GstBuffer containing the data</td>
 119 </tr>
 120 </tbody>
 121 </table></div>
 122 <p class="since">Since 0.10.30</p>
 123 </div>
 124 <hr>
 125 <div class="refsect2">
 126 <a name="gst-tag-list-from-exif-buffer"></a><h3>gst_tag_list_from_exif_buffer ()</h3>
 127 <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_exif_buffer       (<em class="parameter"><code>const <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>,
 128                                                          <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> byte_order</code></em>,
 129                                                          <em class="parameter"><code><span class="type">guint32</span> base_offset</code></em>);</pre>
 130 <p>
 131 Parses the IFD and IFD tags data contained in the buffer and puts it
 132 on a taglist. The base_offset is used to subtract from the offset in
 133 the tag entries and be able to get the offset relative to the buffer
 134 start
 135 </p>
 136 <div class="variablelist"><table border="0">
 137 <col align="left" valign="top">
 138 <tbody>
 139 <tr>
 140 <td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
 141 <td>The exif buffer</td>
 142 </tr>
 143 <tr>
 144 <td><p><span class="term"><em class="parameter"><code>byte_order</code></em> :</span></p></td>
 145 <td>byte order of the data</td>
 146 </tr>
 147 <tr>
 148 <td><p><span class="term"><em class="parameter"><code>base_offset</code></em> :</span></p></td>
 149 <td>Offset from the tiff header to this buffer</td>
 150 </tr>
 151 <tr>
 152 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 153 <td>The parsed taglist</td>
 154 </tr>
 155 </tbody>
 156 </table></div>
 157 <p class="since">Since 0.10.30</p>
 158 </div>
 159 <hr>
 160 <div class="refsect2">
 161 <a name="gst-tag-list-from-exif-buffer-with-tiff-header"></a><h3>gst_tag_list_from_exif_buffer_with_tiff_header ()</h3>
 162 <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_exif_buffer_with_tiff_header
 163                                                         (<em class="parameter"><code>const <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>
 164 <p>
 165 Parses the exif tags starting with a tiff header structure.
 166 </p>
 167 <div class="variablelist"><table border="0">
 168 <col align="left" valign="top">
 169 <tbody>
 170 <tr>
 171 <td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
 172 <td>The exif buffer</td>
 173 </tr>
 174 <tr>
 175 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 176 <td>The taglist</td>
 177 </tr>
 178 </tbody>
 179 </table></div>
 180 <p class="since">Since 0.10.30</p>
 181 </div>
 182 </div>
 183 <div class="refsect1">
 184 <a name="gst-plugins-base-libs-gsttagexif.see-also"></a><h2>See Also</h2>
 185 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#GstTagList"><span class="type">GstTagList</span></a>
 186 </div>
 187 </div>
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