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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>libmediaart Library Reference Manual: Caching and Management</title>
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<a name="libmediaart-Caching-and-Management"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libmediaart-Caching-and-Management.top_of_page"></a>Caching and Management</span></h2>
<p>Caching and Management — Caching and management of stored media art.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libmediaart-Caching-and-Management.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">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libmediaart-Caching-and-Management.html#media-art-get-file" title="media_art_get_file ()">media_art_get_file</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="libmediaart-Caching-and-Management.html#media-art-get-path" title="media_art_get_path ()">media_art_get_path</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libmediaart-Caching-and-Management.html#media-art-remove" title="media_art_remove ()">media_art_remove</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="libmediaart-Caching-and-Management.html#media-art-strip-invalid-entities" title="media_art_strip_invalid_entities ()">media_art_strip_invalid_entities</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libmediaart-Caching-and-Management.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</pre>
</div>
<div class="refsect1">
<a name="libmediaart-Caching-and-Management.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;libmediaart/mediaart.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="libmediaart-Caching-and-Management.description"></a><h2>Description</h2>
<p>These functions give you access to the media art that has been extracted
and saved in the user's XDG_CACHE_HOME directory.</p>
<p>To find the media art for a given media file, use the function
<a class="link" href="libmediaart-Caching-and-Management.html#media-art-get-file" title="media_art_get_file ()"><code class="function">media_art_get_file()</code></a> (you can also use <a class="link" href="libmediaart-Caching-and-Management.html#media-art-get-path" title="media_art_get_path ()"><code class="function">media_art_get_path()</code></a>, which does the
same thing but for path strings instead of <span class="type">GFile</span> objects).</p>
<p>If media art for the file is not found in the cache, these functions will
return <code class="literal">NULL</code>. You may find some embedded media art upon loading the file,
and you can use <a class="link" href="libmediaart-Extraction.html#media-art-process" title="media_art_process ()"><code class="function">media_art_process()</code></a> to convert it to the correct format and
save it in the cache for next time. The <a class="link" href="libmediaart-Extraction.html#media-art-process" title="media_art_process ()"><code class="function">media_art_process()</code></a> function also
supports searching for external media art images using a basic heuristic.</p>
</div>
<div class="refsect1">
<a name="libmediaart-Caching-and-Management.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="media-art-get-file"></a><h3>media_art_get_file ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
media_art_get_file (<em class="parameter"><code>const <span class="type">gchar</span> *artist</code></em>,
                    <em class="parameter"><code>const <span class="type">gchar</span> *title</code></em>,
                    <em class="parameter"><code>const <span class="type">gchar</span> *prefix</code></em>,
                    <em class="parameter"><code><span class="type">GFile</span> *file</code></em>,
                    <em class="parameter"><code><span class="type">GFile</span> **cache_file</code></em>,
                    <em class="parameter"><code><span class="type">GFile</span> **local_file</code></em>);</pre>
<p>Gets the files pointing to cache files suitable for storing the media
art provided by the <em class="parameter"><code>artist</code></em>
, <em class="parameter"><code>title</code></em>
 and <em class="parameter"><code>file</code></em>
 arguments. <em class="parameter"><code>cache_file</code></em>

will point to a location in the XDG user cache directory, meanwhile
<em class="parameter"><code>local_file</code></em>
 will point to a cache file that resides in the same
filesystem than <em class="parameter"><code>file</code></em>
.</p>
<p>When done, both <span class="type">GFile</span>s must be freed with <code class="function">g_object_unref()</code> if
non-<code class="literal">NULL</code>.</p>
<div class="refsect3">
<a name="id-1.3.3.3.7.2.6"></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>artist</p></td>
<td class="parameter_description"><p>the artist</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>title</p></td>
<td class="parameter_description"><p>the title</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>prefix</p></td>
<td class="parameter_description"><p>the prefix for cache files, for example "album"</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>file</p></td>
<td class="parameter_description"><p> the file or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>cache_file</p></td>
<td class="parameter_description"><p> the location to store
a <span class="type">GFile</span> pointing to the user cache path, or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>local_file</p></td>
<td class="parameter_description"><p> the location to store
a <span class="type">GFile</span> pointing to a cache file in the same filesystem than <em class="parameter"><code>file</code></em>
,
or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 0.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="media-art-get-path"></a><h3>media_art_get_path ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
media_art_get_path (<em class="parameter"><code>const <span class="type">gchar</span> *artist</code></em>,
                    <em class="parameter"><code>const <span class="type">gchar</span> *title</code></em>,
                    <em class="parameter"><code>const <span class="type">gchar</span> *prefix</code></em>,
                    <em class="parameter"><code>const <span class="type">gchar</span> *uri</code></em>,
                    <em class="parameter"><code><span class="type">gchar</span> **path</code></em>,
                    <em class="parameter"><code><span class="type">gchar</span> **local_uri</code></em>);</pre>
<p>Get the path to media art for a given resource. Newly allocated data in
<em class="parameter"><code>path</code></em>
 and <em class="parameter"><code>local_uri</code></em>
 must be freed with <code class="function">g_free()</code>.</p>
<div class="refsect3">
<a name="id-1.3.3.3.7.3.5"></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>artist</p></td>
<td class="parameter_description"><p>the artist</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>title</p></td>
<td class="parameter_description"><p>the title</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>prefix</p></td>
<td class="parameter_description"><p>the prefix, for example "album"</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>uri</p></td>
<td class="parameter_description"><p> the uri of the file or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>path</p></td>
<td class="parameter_description"><p> the location to store the local
path or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>local_uri</p></td>
<td class="parameter_description"><p> the location to store the
local uri or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 0.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="media-art-remove"></a><h3>media_art_remove ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
media_art_remove (<em class="parameter"><code>const <span class="type">gchar</span> *artist</code></em>,
                  <em class="parameter"><code>const <span class="type">gchar</span> *album</code></em>);</pre>
<p>Removes media art for given album/artist/etc provided.</p>
<div class="refsect3">
<a name="id-1.3.3.3.7.4.5"></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>artist</p></td>
<td class="parameter_description"><p>artist the media art belongs to</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>album</p></td>
<td class="parameter_description"><p> album the media art belongs or <code class="literal">NULL</code>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.3.7.4.6"></a><h4>Returns</h4>
<p> <span class="type">TRUE</span> on success, otherwise <span class="type">FALSE</span>.</p>
<p></p>
</div>
<p class="since">Since 0.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="media-art-strip-invalid-entities"></a><h3>media_art_strip_invalid_entities ()</h3>
<pre class="programlisting"><span class="returnvalue">gchar</span> *
media_art_strip_invalid_entities (<em class="parameter"><code>const <span class="type">gchar</span> *original</code></em>);</pre>
<p>Strip a albumname or artistname string to prepare it for calculating the
media art path with it. Certain characters and charactersets will be stripped
and a newly allocated string returned which you must free with <code class="function">g_free()</code>.</p>
<p>This functions is used internally by <a class="link" href="libmediaart-Caching-and-Management.html#media-art-get-file" title="media_art_get_file ()"><code class="function">media_art_get_file()</code></a> and
<a class="link" href="libmediaart-Caching-and-Management.html#media-art-get-path" title="media_art_get_path ()"><code class="function">media_art_get_path()</code></a>. You will not normally need to call it yourself.</p>
<p>This function provides the following features:</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><p>Invalid characters include: ()[]&lt;&gt;{}_!@#$^&amp;*+=|\/"'?~;</p></li>
<li class="listitem"><p>Text inside brackets <code class="function">of()</code>, {}, [] and &lt;&gt; pairs are removed.</p></li>
<li class="listitem"><p>Multiples of space characters are removed.</p></li>
</ol></div>
<div class="refsect3">
<a name="id-1.3.3.3.7.5.8"></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>original</p></td>
<td class="parameter_description"><p>original string</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.3.7.5.9"></a><h4>Returns</h4>
<p> <em class="parameter"><code>original</code></em>
stripped of invalid characters which must be
freed. On error or if <em class="parameter"><code>original</code></em>
is empty, <code class="literal">NULL</code> is returned.</p>
<p></p>
</div>
<p class="since">Since 0.2.0</p>
</div>
</div>
<div class="refsect1">
<a name="libmediaart-Caching-and-Management.other_details"></a><h2>Types and Values</h2>
</div>
</div>
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