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<title>Tracker Extract Library Reference Manual: Exif</title>
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<a name="libtracker-extract-Exif"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libtracker-extract-Exif.top_of_page"></a>Exif</span></h2>
<p>Exif — Exchangeable Image File Format (EXIF)</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libtracker-extract-Exif.stability-level"></a><h2>Stability Level</h2>
Stable, unless otherwise indicated
</div>
<div class="refsect1">
<a name="libtracker-extract-Exif.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="libtracker-extract-Exif.html#TrackerExifData" title="TrackerExifData"><span class="returnvalue">TrackerExifData</span></a> *
</td>
<td class="function_name">
<a class="link" href="libtracker-extract-Exif.html#tracker-exif-new" title="tracker_exif_new ()">tracker_exif_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libtracker-extract-Exif.html#tracker-exif-free" title="tracker_exif_free ()">tracker_exif_free</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="libtracker-extract-Exif.html#tracker-exif-read" title="tracker_exif_read ()">tracker_exif_read</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libtracker-extract-Exif.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="libtracker-extract-Exif.html#TrackerExifData" title="TrackerExifData">TrackerExifData</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libtracker-extract-Exif.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</pre>
</div>
<div class="refsect1">
<a name="libtracker-extract-Exif.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <libtracker-extract/tracker-extract.h>
</pre>
</div>
<div class="refsect1">
<a name="libtracker-extract-Exif.description"></a><h2>Description</h2>
<p>Exchangeable Image File Format (EXIF) is a specification for the
image file format used by digital cameras. The specification uses
the existing JPEG, TIFF Rev. 6.0, and RIFF WAV file formats, with
the addition of specific metadata tags. It is not supported in JPEG
2000, PNG, or GIF.</p>
<p>This API is provided to remove code duplication between extractors
using these standards.</p>
</div>
<div class="refsect1">
<a name="libtracker-extract-Exif.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="tracker-exif-new"></a><h3>tracker_exif_new ()</h3>
<pre class="programlisting"><a class="link" href="libtracker-extract-Exif.html#TrackerExifData" title="TrackerExifData"><span class="returnvalue">TrackerExifData</span></a> *
tracker_exif_new (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guchar"><span class="type">guchar</span></a> *buffer</code></em>,
<em class="parameter"><code><span class="type">size_t</span> len</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *uri</code></em>);</pre>
<p>This function takes <em class="parameter"><code>len</code></em>
bytes of <em class="parameter"><code>buffer</code></em>
and runs it through the
EXIF library.</p>
<div class="refsect3">
<a name="id-1.3.4.4.9.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a chunk of data with exif data in it.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>len</p></td>
<td class="parameter_description"><p>the size of <em class="parameter"><code>buffer</code></em>
.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>uri</p></td>
<td class="parameter_description"><p>the URI this is related to.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.4.4.9.2.6"></a><h4>Returns</h4>
<p> a newly allocated <a class="link" href="libtracker-extract-Exif.html#TrackerExifData" title="TrackerExifData"><span class="type">TrackerExifData</span></a> struct if EXIF data was
found, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> otherwise. Free the returned struct with <a class="link" href="libtracker-extract-Exif.html#tracker-exif-free" title="tracker_exif_free ()"><code class="function">tracker_exif_free()</code></a>.</p>
<p></p>
</div>
<p class="since">Since 0.10</p>
</div>
<hr>
<div class="refsect2">
<a name="tracker-exif-free"></a><h3>tracker_exif_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
tracker_exif_free (<em class="parameter"><code><a class="link" href="libtracker-extract-Exif.html#TrackerExifData" title="TrackerExifData"><span class="type">TrackerExifData</span></a> *data</code></em>);</pre>
<p>Frees <em class="parameter"><code>data</code></em>
and all <a class="link" href="libtracker-extract-Exif.html#TrackerExifData" title="TrackerExifData"><span class="type">TrackerExifData</span></a> members. <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> will produce a
a warning.</p>
<div class="refsect3">
<a name="id-1.3.4.4.9.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p>a <a class="link" href="libtracker-extract-Exif.html#TrackerExifData" title="TrackerExifData"><span class="type">TrackerExifData</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since 0.10</p>
</div>
<hr>
<div class="refsect2">
<a name="tracker-exif-read"></a><h3>tracker_exif_read ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
tracker_exif_read (<em class="parameter"><code>const unsigned <span class="type">char</span> *buffer</code></em>,
<em class="parameter"><code><span class="type">size_t</span> len</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *uri</code></em>,
<em class="parameter"><code><a class="link" href="libtracker-extract-Exif.html#TrackerExifData" title="TrackerExifData"><span class="type">TrackerExifData</span></a> *data</code></em>);</pre>
<div class="warning">
<p><code class="literal">tracker_exif_read</code> has been deprecated since version 0.9. and should not be used in newly-written code.</p>
<p>Use <a class="link" href="libtracker-extract-Exif.html#tracker-exif-new" title="tracker_exif_new ()"><code class="function">tracker_exif_new()</code></a> instead.</p>
</div>
<p>This function takes <em class="parameter"><code>len</code></em>
bytes of <em class="parameter"><code>buffer</code></em>
and runs it through the
EXIF library. The result is that <em class="parameter"><code>data</code></em>
is populated with the EXIF
data found in <em class="parameter"><code>uri</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.4.4.9.4.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a chunk of data with exif data in it.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>len</p></td>
<td class="parameter_description"><p>the size of <em class="parameter"><code>buffer</code></em>
.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>uri</p></td>
<td class="parameter_description"><p>the URI this is related to.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p>a pointer to a TrackerExifData struture to populate.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.4.4.9.4.8"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the <em class="parameter"><code>data</code></em>
was populated successfully, otherwise
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> is returned.</p>
<p></p>
</div>
<p class="since">Since 0.8</p>
</div>
</div>
<div class="refsect1">
<a name="libtracker-extract-Exif.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="TrackerExifData"></a><h3>TrackerExifData</h3>
<pre class="programlisting">typedef struct {
gchar *y_dimension;
gchar *x_dimension;
gchar *image_width;
gchar *document_name;
gchar *time;
gchar *time_original;
gchar *artist;
gchar *user_comment;
gchar *description;
gchar *make;
gchar *model;
gchar *orientation;
gchar *exposure_time;
gchar *fnumber;
gchar *flash;
gchar *focal_length;
gchar *iso_speed_ratings;
gchar *metering_mode;
gchar *white_balance;
gchar *copyright;
gchar *software;
gchar *x_resolution;
gchar *y_resolution;
gint resolution_unit;
/* ABI barrier (don't change things above this) */
gchar *gps_altitude;
gchar *gps_latitude;
gchar *gps_longitude;
gchar *gps_direction;
} TrackerExifData;
</pre>
<p>Structure defining EXIF data.</p>
<div class="refsect3">
<a name="id-1.3.4.4.10.2.5"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.y-dimension"></a>y_dimension</code></em>;</p></td>
<td class="struct_member_description"><p>Y dimension.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.x-dimension"></a>x_dimension</code></em>;</p></td>
<td class="struct_member_description"><p>X dimension.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.image-width"></a>image_width</code></em>;</p></td>
<td class="struct_member_description"><p>Image width.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.document-name"></a>document_name</code></em>;</p></td>
<td class="struct_member_description"><p>Document name.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.time"></a>time</code></em>;</p></td>
<td class="struct_member_description"><p>Time.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.time-original"></a>time_original</code></em>;</p></td>
<td class="struct_member_description"><p>Original time.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.artist"></a>artist</code></em>;</p></td>
<td class="struct_member_description"><p>Artist.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.user-comment"></a>user_comment</code></em>;</p></td>
<td class="struct_member_description"><p>User-provided comment.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.description"></a>description</code></em>;</p></td>
<td class="struct_member_description"><p>Description.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.make"></a>make</code></em>;</p></td>
<td class="struct_member_description"><p>Make info.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.model"></a>model</code></em>;</p></td>
<td class="struct_member_description"><p>Model info.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.orientation"></a>orientation</code></em>;</p></td>
<td class="struct_member_description"><p>Orientation.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.exposure-time"></a>exposure_time</code></em>;</p></td>
<td class="struct_member_description"><p>Exposure time.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.fnumber"></a>fnumber</code></em>;</p></td>
<td class="struct_member_description"><p>Focal ratio</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.flash"></a>flash</code></em>;</p></td>
<td class="struct_member_description"><p>Flash info.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.focal-length"></a>focal_length</code></em>;</p></td>
<td class="struct_member_description"><p>Focal length.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.iso-speed-ratings"></a>iso_speed_ratings</code></em>;</p></td>
<td class="struct_member_description"><p>ISO speed ratings.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.metering-mode"></a>metering_mode</code></em>;</p></td>
<td class="struct_member_description"><p>Metering mode.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.white-balance"></a>white_balance</code></em>;</p></td>
<td class="struct_member_description"><p>White balance.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.copyright"></a>copyright</code></em>;</p></td>
<td class="struct_member_description"><p>Copyright.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.software"></a>software</code></em>;</p></td>
<td class="struct_member_description"><p>Software used.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.x-resolution"></a>x_resolution</code></em>;</p></td>
<td class="struct_member_description"><p>Horizontal resolution.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.y-resolution"></a>y_resolution</code></em>;</p></td>
<td class="struct_member_description"><p>Vertical resolution.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="TrackerExifData.resolution-unit"></a>resolution_unit</code></em>;</p></td>
<td class="struct_member_description"><p>Resolution units.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.gps-altitude"></a>gps_altitude</code></em>;</p></td>
<td class="struct_member_description"><p>GPS altitude.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.gps-latitude"></a>gps_latitude</code></em>;</p></td>
<td class="struct_member_description"><p>GPS latitude.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.gps-longitude"></a>gps_longitude</code></em>;</p></td>
<td class="struct_member_description"><p>GPS longitude.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="TrackerExifData.gps-direction"></a>gps_direction</code></em>;</p></td>
<td class="struct_member_description"><p>GPS direction information.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
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</div>
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