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<a href="#libtracker-extract-Exif.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="libtracker-extract-Exif"></a><div class="titlepage"></div>
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<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 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="refsynopsisdiv">
<a name="libtracker-extract-Exif.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <libtracker-extract/tracker-extract.h>
<a class="link" href="libtracker-extract-Exif.html#TrackerExifData" title="TrackerExifData">TrackerExifData</a>;
<a class="link" href="libtracker-extract-Exif.html#TrackerExifData" title="TrackerExifData"><span class="returnvalue">TrackerExifData</span></a> * <a class="link" href="libtracker-extract-Exif.html#tracker-exif-new" title="tracker_exif_new ()">tracker_exif_new</a> (<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>);
<span class="returnvalue">void</span> <a class="link" href="libtracker-extract-Exif.html#tracker-exif-free" title="tracker_exif_free ()">tracker_exif_free</a> (<em class="parameter"><code><a class="link" href="libtracker-extract-Exif.html#TrackerExifData" title="TrackerExifData"><span class="type">TrackerExifData</span></a> *data</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="libtracker-extract-Exif.html#tracker-exif-read" title="tracker_exif_read ()">tracker_exif_read</a> (<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>
<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.details"></a><h2>Details</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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Y dimension.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>X dimension.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Image width.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Document name.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Time.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Original time.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Artist.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>User-provided comment.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Description.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Make info.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Model info.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Orientation.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Exposure time.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Focal ratio</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Flash info.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Focal length.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>ISO speed ratings.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Metering mode.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>White balance.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Copyright.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Software used.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Horizontal resolution.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Vertical resolution.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>Resolution units.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>GPS altitude.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>GPS latitude.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>GPS longitude.</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>GPS direction information.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<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="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>a chunk of data with exif data in it.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>len</code></em> :</span></p></td>
<td>the size of <em class="parameter"><code>buffer</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>uri</code></em> :</span></p></td>
<td>the URI this is related to.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>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>.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>a <a class="link" href="libtracker-extract-Exif.html#TrackerExifData" title="TrackerExifData"><span class="type">TrackerExifData</span></a>
</td>
</tr></tbody>
</table></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" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Warning</h3>
<p><code class="literal">tracker_exif_read</code> is deprecated and should not be used in newly-written code. 0.9. 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="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>a chunk of data with exif data in it.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>len</code></em> :</span></p></td>
<td>the size of <em class="parameter"><code>buffer</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>uri</code></em> :</span></p></td>
<td>the URI this is related to.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>a pointer to a TrackerExifData struture to populate.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.8</p>
</div>
</div>
</div>
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