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<div class="refentry">
<a name="libmediaart-Cache"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libmediaart-Cache.top_of_page"></a>Cache</span></h2>
<p>Cache — Caching and lookup of stored media art.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libmediaart-Cache.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">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libmediaart-Cache.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-Cache.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">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libmediaart-Cache.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">void</span>
</td>
<td class="function_name">
<a class="link" href="libmediaart-Cache.html#media-art-remove-async" title="media_art_remove_async ()">media_art_remove_async</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-Cache.html#media-art-remove-finish" title="media_art_remove_finish ()">media_art_remove_finish</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-Cache.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-Cache.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <libmediaart/mediaart.h>
</pre>
</div>
<div class="refsect1">
<a name="libmediaart-Cache.description"></a><h2>Description</h2>
<p>These functions give you access to the media art that has been
extracted and saved. There are normally two places the media art
will be located in. These locations store symlinks not real copies
of the content:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>The user's XDG_CACHE_HOME directory (usually
<code class="filename">~/.cache/media-art/</code>)</p></li>
<li class="listitem"><p>The local file system's top level
<code class="filename">.mediaartlocal</code> directory (for example
<code class="filename">/media/martyn/pendrive/.mediaartlocal/</code>)</p></li>
</ul></div>
<p>To find the media art for a given media file, use the function
<a class="link" href="libmediaart-Cache.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-Cache.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-MediaArtProcess.html#media-art-process-buffer" title="media_art_process_buffer ()"><code class="function">media_art_process_buffer()</code></a>
to convert it to the correct format and save it in the cache for
next time. The <a class="link" href="libmediaart-MediaArtProcess.html#media-art-process-file" title="media_art_process_file ()"><code class="function">media_art_process_file()</code></a> function also supports
searching for external media art images using a basic heuristic.</p>
</div>
<div class="refsect1">
<a name="libmediaart-Cache.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="media-art-get-path"></a><h3>media_art_get_path ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</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><span class="type">gchar</span> **cache_path</code></em>);</pre>
<p>This function calls <a class="link" href="libmediaart-Cache.html#media-art-get-file" title="media_art_get_file ()"><code class="function">media_art_get_file()</code></a> by creating a <span class="type">GFile</span> for
<em class="parameter"><code>uri</code></em>
and passing the same arguments to <a class="link" href="libmediaart-Cache.html#media-art-get-file" title="media_art_get_file ()"><code class="function">media_art_get_file()</code></a>. For more
details about what this function does, see <a class="link" href="libmediaart-Cache.html#media-art-get-file" title="media_art_get_file ()"><code class="function">media_art_get_file()</code></a>.</p>
<p>Get the path to media art for a given resource. Newly allocated
data returned in <em class="parameter"><code>cache_path</code></em>
must be freed with <code class="function">g_free()</code>.</p>
<div class="refsect3">
<a name="id-1.3.3.3.6.2.6"></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"><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>title</p></td>
<td class="parameter_description"><p> the title. </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>prefix</p></td>
<td class="parameter_description"><p> the prefix, for example "album". </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_path</p></td>
<td class="parameter_description"><p> a string
representing the path to the cache for this media art
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>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.3.6.2.7"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if <em class="parameter"><code>cache_path</code></em>
was returned, otherwise <code class="literal">FALSE</code>.</p>
<p></p>
</div>
<p class="since">Since 0.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="media-art-get-file"></a><h3>media_art_get_file ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</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> **cache_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..</p>
<p>The <em class="parameter"><code>cache_file</code></em>
relates to a symlink stored in XDG cache directories
for the user. A <em class="parameter"><code>cache_file</code></em>
would be expected to look like
<code class="filename">file:///home/martyn/.cache/media-art/...</code>. This
is normally the location that is most useful (assuming the cache
has been extracted in the first place).</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>
<p>This operation should not use i/o, but it depends on the backend
GFile implementation.</p>
<div class="refsect3">
<a name="id-1.3.3.3.6.3.8"></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>artist</p></td>
<td class="parameter_description"><p> the artist. </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>title</p></td>
<td class="parameter_description"><p> the title. </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>prefix</p></td>
<td class="parameter_description"><p> the prefix for cache files, for example "album". </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> a pointer to a
<span class="type">GFile</span> which represents the cached file for media art, or <code class="literal">NULL</code>
a <span class="type">GFile</span> representing the user's cache path, or <code class="literal">NULL</code>
<span class="type">GFile</span> representing the location of the local media art. </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>
<div class="refsect3">
<a name="id-1.3.3.3.6.3.9"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if <em class="parameter"><code>cache_file</code></em>
was returned, otherwise <code class="literal">FALSE</code>.</p>
<p></p>
</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>,
<em class="parameter"><code><span class="type">GCancellable</span> *cancellable</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>Removes media art for given album/artist provided.</p>
<p>If <em class="parameter"><code>artist</code></em>
and <em class="parameter"><code>album</code></em>
are <code class="literal">NULL</code>, ALL media art cache is removed.</p>
<div class="refsect3">
<a name="id-1.3.3.3.6.4.6"></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>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>
<tr>
<td class="parameter_name"><p>cancellable</p></td>
<td class="parameter_description"><p> optional <span class="type">GCancellable</span> object, <code class="literal">NULL</code> to ignore. </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>error</p></td>
<td class="parameter_description"><p>location to store the error occurring, or <code class="literal">NULL</code> to ignore</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.3.6.4.7"></a><h4>Returns</h4>
<p> <span class="type">TRUE</span> on success, otherwise <span class="type">FALSE</span> where <em class="parameter"><code>error</code></em>
will be set.</p>
<p></p>
</div>
<p class="since">Since 0.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="media-art-remove-async"></a><h3>media_art_remove_async ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
media_art_remove_async (<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>,
<em class="parameter"><code><span class="type">gint</span> io_priority</code></em>,
<em class="parameter"><code><span class="type">GObject</span> *source_object</code></em>,
<em class="parameter"><code><span class="type">GCancellable</span> *cancellable</code></em>,
<em class="parameter"><code><span class="type">GAsyncReadyCallback</span> callback</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> user_data</code></em>);</pre>
<p>Removes media art for given album/artist provided. Precisely the
same operation as <a class="link" href="libmediaart-Cache.html#media-art-remove" title="media_art_remove ()"><code class="function">media_art_remove()</code></a> is performing, but
asynchronously.</p>
<p>When all i/o for the operation is finished the <em class="parameter"><code>callback</code></em>
will be
called.</p>
<p>In case of a partial error the callback will be called with any
succeeding items and no error, and on the next request the error
will be reported. If a request is cancelled the callback will be
called with <code class="literal">G_IO_ERROR_CANCELLED</code>.</p>
<p>During an async request no other sync and async calls are allowed,
and will result in <code class="literal">G_IO_ERROR_PENDING</code> errors.</p>
<p>Any outstanding i/o request with higher priority (lower numerical
value) will be executed before an outstanding request with lower
priority. Default priority is <code class="literal">G_PRIORITY_DEFAULT</code>.</p>
<div class="refsect3">
<a name="id-1.3.3.3.6.5.9"></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>
<tr>
<td class="parameter_name"><p>io_priority</p></td>
<td class="parameter_description"><p>the I/O priority of the request</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>source_object</p></td>
<td class="parameter_description"><p> the <span class="type">GObject</span> this task belongs to,
can be <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>cancellable</p></td>
<td class="parameter_description"><p> optional <span class="type">GCancellable</span> object, <code class="literal">NULL</code> to
ignore. </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>callback</p></td>
<td class="parameter_description"><p> a <span class="type">GAsyncReadyCallback</span> to call when the
request is satisfied. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="The callback is valid until first called."><span class="acronym">scope async</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p> the data to pass to callback function. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 0.7.0</p>
</div>
<hr>
<div class="refsect2">
<a name="media-art-remove-finish"></a><h3>media_art_remove_finish ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
media_art_remove_finish (<em class="parameter"><code><span class="type">GObject</span> *source_object</code></em>,
<em class="parameter"><code><span class="type">GAsyncResult</span> *result</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>Finishes the asynchronous operation started with
<a class="link" href="libmediaart-Cache.html#media-art-remove-async" title="media_art_remove_async ()"><code class="function">media_art_remove_async()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.3.3.6.6.5"></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>source_object</p></td>
<td class="parameter_description"><p> the <span class="type">GObject</span> this task belongs to,
can be <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>result</p></td>
<td class="parameter_description"><p>a <span class="type">GAsyncResult</span>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>a <span class="type">GError</span> location to store the error occurring, or <code class="literal">NULL</code>
to ignore.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.3.3.6.6.6"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> on success, otherwise <code class="literal">FALSE</code> when <em class="parameter"><code>error</code></em>
will be set.</p>
<p></p>
</div>
<p class="since">Since 0.7.0</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-Cache.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-Cache.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: ()[]<>{}_!@#$^&*+=|\/"'?~;</p></li>
<li class="listitem"><p>Text inside brackets <code class="function">of()</code>, {}, [] and <> 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-1.3.3.3.6.7.8"></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-1.3.3.3.6.7.9"></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-Cache.other_details"></a><h2>Types and Values</h2>
</div>
</div>
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