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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Rhythmbox Development Reference Manual: RBExtDB</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="10"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> 
                  <a href="#rhythmbox-RBExtDB.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> 
                  <a href="#rhythmbox-RBExtDB.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="ch03.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
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</tr></table>
<div class="refentry">
<a name="rhythmbox-RBExtDB"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="rhythmbox-RBExtDB.top_of_page"></a>RBExtDB</span></h2>
<p>RBExtDB — store for external metadata such as album art</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="rhythmbox-RBExtDB.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">
<span class="c_punctuation">(</span><a class="link" href="rhythmbox-RBExtDB.html#RBExtDBRequestCallback" title="RBExtDBRequestCallback ()">*RBExtDBRequestCallback</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="rhythmbox-RBExtDB.html#RBExtDB" title="struct RBExtDB"><span class="returnvalue">RBExtDB</span></a> *
</td>
<td class="function_name">
<a class="link" href="rhythmbox-RBExtDB.html#rb-ext-db-new" title="rb_ext_db_new ()">rb_ext_db_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">char</span> *
</td>
<td class="function_name">
<a class="link" href="rhythmbox-RBExtDB.html#rb-ext-db-lookup" title="rb_ext_db_lookup ()">rb_ext_db_lookup</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="rhythmbox-RBExtDB.html#rb-ext-db-request" title="rb_ext_db_request ()">rb_ext_db_request</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="rhythmbox-RBExtDB.html#rb-ext-db-store-uri" title="rb_ext_db_store_uri ()">rb_ext_db_store_uri</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="rhythmbox-RBExtDB.html#rb-ext-db-store" title="rb_ext_db_store ()">rb_ext_db_store</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="rhythmbox-RBExtDB.html#rb-ext-db-store-raw" title="rb_ext_db_store_raw ()">rb_ext_db_store_raw</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="rhythmbox-RBExtDB.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">enum</td>
<td class="function_name"><a class="link" href="rhythmbox-RBExtDB.html#RBExtDBSourceType" title="enum RBExtDBSourceType">RBExtDBSourceType</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="rhythmbox-RBExtDB.html#RBExtDB" title="struct RBExtDB">RBExtDB</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="rhythmbox-RBExtDB.html#RBExtDBClass" title="struct RBExtDBClass">RBExtDBClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="rhythmbox-RBExtDB.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</pre>
</div>
<div class="refsect1">
<a name="rhythmbox-RBExtDB.description"></a><h2>Description</h2>
<p>This class simplifies searching for and providing external metadata
such as album art or lyrics.  A metadata provider connects to a signal
on the database and in response provides a URI, a buffer containing the
data, or an object representation of the data (such as a GdkPixbuf).
A metadata requestor calls rb_ext_db_request and specifies a callback,
or alternatively connects to a signal to receive all metadata as it is
stored.</p>
</div>
<div class="refsect1">
<a name="rhythmbox-RBExtDB.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="RBExtDBRequestCallback"></a><h3>RBExtDBRequestCallback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*RBExtDBRequestCallback<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="rhythmbox-rb-ext-db-key.html#RBExtDBKey" title="RBExtDBKey"><span class="type">RBExtDBKey</span></a> *key</code></em>,
                           <em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
                           <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> *data</code></em>,
                           <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="rb-ext-db-new"></a><h3>rb_ext_db_new ()</h3>
<pre class="programlisting"><a class="link" href="rhythmbox-RBExtDB.html#RBExtDB" title="struct RBExtDB"><span class="returnvalue">RBExtDB</span></a> *
rb_ext_db_new (<em class="parameter"><code>const <span class="type">char</span> *name</code></em>);</pre>
<p>Provides access to a metadata store instance.</p>
<div class="refsect3">
<a name="id-1.4.3.7.3.5"></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>name</p></td>
<td class="parameter_description"><p>name of the metadata store</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.3.7.3.6"></a><h4>Returns</h4>
<p> named metadata store instance</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-ext-db-lookup"></a><h3>rb_ext_db_lookup ()</h3>
<pre class="programlisting"><span class="returnvalue">char</span> *
rb_ext_db_lookup (<em class="parameter"><code><a class="link" href="rhythmbox-RBExtDB.html#RBExtDB" title="struct RBExtDB"><span class="type">RBExtDB</span></a> *store</code></em>,
                  <em class="parameter"><code><a class="link" href="rhythmbox-rb-ext-db-key.html#RBExtDBKey" title="RBExtDBKey"><span class="type">RBExtDBKey</span></a> *key</code></em>);</pre>
<p>Looks up a cached metadata item.</p>
<div class="refsect3">
<a name="id-1.4.3.7.4.5"></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>store</p></td>
<td class="parameter_description"><p>metadata store instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>metadata lookup key</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.3.7.4.6"></a><h4>Returns</h4>
<p> name of the file storing the cached metadata item</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-ext-db-request"></a><h3>rb_ext_db_request ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_ext_db_request (<em class="parameter"><code><a class="link" href="rhythmbox-RBExtDB.html#RBExtDB" title="struct RBExtDB"><span class="type">RBExtDB</span></a> *store</code></em>,
                   <em class="parameter"><code><a class="link" href="rhythmbox-rb-ext-db-key.html#RBExtDBKey" title="RBExtDBKey"><span class="type">RBExtDBKey</span></a> *key</code></em>,
                   <em class="parameter"><code><a class="link" href="rhythmbox-RBExtDB.html#RBExtDBRequestCallback" title="RBExtDBRequestCallback ()"><span class="type">RBExtDBRequestCallback</span></a> callback</code></em>,
                   <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                   <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy</code></em>);</pre>
<p>Requests a metadata item.  If the item is cached, the callback will be called
synchronously.  Otherwise, metadata providers will provide results asynchronously.</p>
<div class="refsect3">
<a name="id-1.4.3.7.5.5"></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>store</p></td>
<td class="parameter_description"><p>metadata store instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>metadata lookup key</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>callback</p></td>
<td class="parameter_description"><p>callback to call with results</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data to pass to the callback</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>destroy</p></td>
<td class="parameter_description"><p>destroy function for <em class="parameter"><code>user_data</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.4.3.7.5.6"></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 results may be provided after returning</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-ext-db-store-uri"></a><h3>rb_ext_db_store_uri ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_ext_db_store_uri (<em class="parameter"><code><a class="link" href="rhythmbox-RBExtDB.html#RBExtDB" title="struct RBExtDB"><span class="type">RBExtDB</span></a> *store</code></em>,
                     <em class="parameter"><code><a class="link" href="rhythmbox-rb-ext-db-key.html#RBExtDBKey" title="RBExtDBKey"><span class="type">RBExtDBKey</span></a> *key</code></em>,
                     <em class="parameter"><code><a class="link" href="rhythmbox-RBExtDB.html#RBExtDBSourceType" title="enum RBExtDBSourceType"><span class="type">RBExtDBSourceType</span></a> source_type</code></em>,
                     <em class="parameter"><code>const <span class="type">char</span> *uri</code></em>);</pre>
<p>Stores an item identified by <em class="parameter"><code>uri</code></em>
 in the metadata store so that
lookups matching <em class="parameter"><code>key</code></em>
 will return it.</p>
<div class="refsect3">
<a name="id-1.4.3.7.6.5"></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>store</p></td>
<td class="parameter_description"><p>metadata store instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>metadata storage key</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>source_type</p></td>
<td class="parameter_description"><p>metadata source type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>uri</p></td>
<td class="parameter_description"><p> URI of the item to store. </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-ext-db-store"></a><h3>rb_ext_db_store ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_ext_db_store (<em class="parameter"><code><a class="link" href="rhythmbox-RBExtDB.html#RBExtDB" title="struct RBExtDB"><span class="type">RBExtDB</span></a> *store</code></em>,
                 <em class="parameter"><code><a class="link" href="rhythmbox-rb-ext-db-key.html#RBExtDBKey" title="RBExtDBKey"><span class="type">RBExtDBKey</span></a> *key</code></em>,
                 <em class="parameter"><code><a class="link" href="rhythmbox-RBExtDB.html#RBExtDBSourceType" title="enum RBExtDBSourceType"><span class="type">RBExtDBSourceType</span></a> source_type</code></em>,
                 <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> *data</code></em>);</pre>
<p>Stores an item in the metadata store so that lookups matching <em class="parameter"><code>key</code></em>
 will
return it.  <em class="parameter"><code>data</code></em>
 should contain an object that must be transformed using
the RBExtDB::store signal before being stored.  For example,
the album art cache expects <a href="/usr/share/gtk-doc/html/gdk-pixbuf/gdk-pixbuf-The-GdkPixbuf-Structure.html#GdkPixbuf"><span class="type">GdkPixbuf</span></a> objects here, rather than buffers
containing JPEG encoded files.</p>
<div class="refsect3">
<a name="id-1.4.3.7.7.5"></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>store</p></td>
<td class="parameter_description"><p>metadata store instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>metadata storage key</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>source_type</p></td>
<td class="parameter_description"><p>metadata source type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p> data to store. </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-ext-db-store-raw"></a><h3>rb_ext_db_store_raw ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_ext_db_store_raw (<em class="parameter"><code><a class="link" href="rhythmbox-RBExtDB.html#RBExtDB" title="struct RBExtDB"><span class="type">RBExtDB</span></a> *store</code></em>,
                     <em class="parameter"><code><a class="link" href="rhythmbox-rb-ext-db-key.html#RBExtDBKey" title="RBExtDBKey"><span class="type">RBExtDBKey</span></a> *key</code></em>,
                     <em class="parameter"><code><a class="link" href="rhythmbox-RBExtDB.html#RBExtDBSourceType" title="enum RBExtDBSourceType"><span class="type">RBExtDBSourceType</span></a> source_type</code></em>,
                     <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> *data</code></em>);</pre>
<p>Stores an item in the metadata store so that lookpus matching <em class="parameter"><code>key</code></em>

will return it.  <em class="parameter"><code>data</code></em>
 should contain the data to be written to the
store, either as a string or as a <a href="/usr/share/gtk-doc/html/glib/glib-Byte-Arrays.html#GByteArray"><span class="type">GByteArray</span></a>.</p>
<div class="refsect3">
<a name="id-1.4.3.7.8.5"></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>store</p></td>
<td class="parameter_description"><p>metadata store instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>metadata storage key</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>source_type</p></td>
<td class="parameter_description"><p>metadata source type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p> data to store. </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="rhythmbox-RBExtDB.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="RBExtDBSourceType"></a><h3>enum RBExtDBSourceType</h3>
<p>
</p>
<div class="refsect3">
<a name="id-1.4.3.8.2.4"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="RB-EXT-DB-SOURCE-NONE:CAPS"></a>RB_EXT_DB_SOURCE_NONE</p></td>
<td class="enum_member_description"> </td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-EXT-DB-SOURCE-SEARCH:CAPS"></a>RB_EXT_DB_SOURCE_SEARCH</p></td>
<td class="enum_member_description"> </td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-EXT-DB-SOURCE-EMBEDDED:CAPS"></a>RB_EXT_DB_SOURCE_EMBEDDED</p></td>
<td class="enum_member_description"> </td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-EXT-DB-SOURCE-USER:CAPS"></a>RB_EXT_DB_SOURCE_USER</p></td>
<td class="enum_member_description"> </td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-EXT-DB-SOURCE-USER-EXPLICIT:CAPS"></a>RB_EXT_DB_SOURCE_USER_EXPLICIT</p></td>
<td class="enum_member_description"> </td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="RBExtDB"></a><h3>struct RBExtDB</h3>
<pre class="programlisting">struct RBExtDB {
	GObject parent;

	RBExtDBPrivate *priv;
};
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="RBExtDBClass"></a><h3>struct RBExtDBClass</h3>
<pre class="programlisting">struct RBExtDBClass {
	GObjectClass parent;

	/* requestor signals */
	void		(*added) (RBExtDB *store,
					 RBExtDBKey *key,
					 const char *filename,
					 GValue *data);

	/* provider signals */
	gboolean (*request) (RBExtDB *store,
					 RBExtDBKey *key,
					 guint64 last_time);

	/* data format conversion signals */
	GValue * (*store) (RBExtDB *store,
					 GValue *data);
	GValue * (*load)		(RBExtDB *store,
					 GValue *data);
};
</pre>
<p>
</p>
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