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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>RBMetaData: Rhythmbox Development Reference Manual</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="index.html" title="Rhythmbox Development Reference Manual">
<link rel="up" href="ch03.html" title="Metadata">
<link rel="prev" href="ch03.html" title="Metadata">
<link rel="next" href="rhythmbox-RBExtDB.html" title="RBExtDB">
<meta name="generator" content="GTK-Doc V1.27 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><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="#RBMetaData.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#RBMetaData.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>
<td><a accesskey="p" href="ch03.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="rhythmbox-RBExtDB.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<div class="refentry">
<a name="RBMetaData"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="RBMetaData.top_of_page"></a>RBMetaData</span></h2>
<p>RBMetaData — metadata reader and writer interface</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="RBMetaData.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a href="../glib/glib-Quarks.html#GQuark"><span class="returnvalue">GQuark</span></a>
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-error-quark" title="rb_metadata_error_quark ()">rb_metadata_error_quark</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../gobject/gobject-Type-Information.html#GType"><span class="returnvalue">GType</span></a>
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-get-field-type" title="rb_metadata_get_field_type ()">rb_metadata_get_field_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">char</span> *
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-get-field-name" title="rb_metadata_get_field_name ()">rb_metadata_get_field_name</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="RBMetaData.html" title="RBMetaData"><span class="returnvalue">RBMetaData</span></a> *
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-new" title="rb_metadata_new ()">rb_metadata_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-can-save" title="rb_metadata_can_save ()">rb_metadata_can_save</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="RBMetaData.html#rb-metadata-get-saveable-types" title="rb_metadata_get_saveable_types ()">rb_metadata_get_saveable_types</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="RBMetaData.html#rb-metadata-reset" title="rb_metadata_reset ()">rb_metadata_reset</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="RBMetaData.html#rb-metadata-load" title="rb_metadata_load ()">rb_metadata_load</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="RBMetaData.html#rb-metadata-save" title="rb_metadata_save ()">rb_metadata_save</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">char</span> *
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-get-media-type" title="rb_metadata_get_media_type ()">rb_metadata_get_media_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-has-missing-plugins" title="rb_metadata_has_missing_plugins ()">rb_metadata_has_missing_plugins</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-get-missing-plugins" title="rb_metadata_get_missing_plugins ()">rb_metadata_get_missing_plugins</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-has-audio" title="rb_metadata_has_audio ()">rb_metadata_has_audio</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-has-video" title="rb_metadata_has_video ()">rb_metadata_has_video</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-has-other-data" title="rb_metadata_has_other_data ()">rb_metadata_has_other_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-get" title="rb_metadata_get ()">rb_metadata_get</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="RBMetaData.html#rb-metadata-set" title="rb_metadata_set ()">rb_metadata_set</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="RBMetaData.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" 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="RBMetaData.html#RBMetaDataField" title="enum RBMetaDataField">RBMetaDataField</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="RBMetaData.html#RBMetaDataError" title="enum RBMetaDataError">RBMetaDataError</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="RBMetaData.html#RBMetaData-struct" title="struct RBMetaData">RBMetaData</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="RBMetaData.html#RBMetaDataClass" title="struct RBMetaDataClass">RBMetaDataClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="RBMetaData.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="../gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
    <span class="lineart">╰──</span> RBMetaData
</pre>
</div>
<div class="refsect1">
<a name="RBMetaData.description"></a><h2>Description</h2>
<p>Provides a simple synchronous interface for metadata extraction and updating.</p>
</div>
<div class="refsect1">
<a name="RBMetaData.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="rb-metadata-error-quark"></a><h3>rb_metadata_error_quark ()</h3>
<pre class="programlisting"><a href="../glib/glib-Quarks.html#GQuark"><span class="returnvalue">GQuark</span></a>
rb_metadata_error_quark (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-get-field-type"></a><h3>rb_metadata_get_field_type ()</h3>
<pre class="programlisting"><a href="../gobject/gobject-Type-Information.html#GType"><span class="returnvalue">GType</span></a>
rb_metadata_get_field_type (<em class="parameter"><code><a class="link" href="RBMetaData.html#RBMetaDataField" title="enum RBMetaDataField"><span class="type">RBMetaDataField</span></a> field</code></em>);</pre>
<p>Returns the <a href="../gobject/gobject-Type-Information.html#GType"><span class="type">GType</span></a> of the value for a metadata field.</p>
<div class="refsect3">
<a name="rb-metadata-get-field-type.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>field</p></td>
<td class="parameter_description"><p>a <a class="link" href="RBMetaData.html#RBMetaDataField" title="enum RBMetaDataField"><span class="type">RBMetaDataField</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-metadata-get-field-type.returns"></a><h4>Returns</h4>
<p> value type</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-get-field-name"></a><h3>rb_metadata_get_field_name ()</h3>
<pre class="programlisting">const <span class="returnvalue">char</span> *
rb_metadata_get_field_name (<em class="parameter"><code><a class="link" href="RBMetaData.html#RBMetaDataField" title="enum RBMetaDataField"><span class="type">RBMetaDataField</span></a> field</code></em>);</pre>
<p>Returns the name of a metadata field.</p>
<div class="refsect3">
<a name="rb-metadata-get-field-name.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>field</p></td>
<td class="parameter_description"><p>a <a class="link" href="RBMetaData.html#RBMetaDataField" title="enum RBMetaDataField"><span class="type">RBMetaDataField</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-metadata-get-field-name.returns"></a><h4>Returns</h4>
<p> field name</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-new"></a><h3>rb_metadata_new ()</h3>
<pre class="programlisting"><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="returnvalue">RBMetaData</span></a> *
rb_metadata_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Creates a new metadata backend instance.</p>
<div class="refsect3">
<a name="rb-metadata-new.returns"></a><h4>Returns</h4>
<p> new <a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> instance</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-can-save"></a><h3>rb_metadata_can_save ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_metadata_can_save (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>,
                      <em class="parameter"><code>const <span class="type">char</span> *media_type</code></em>);</pre>
<p>Checks if the metadata writer is capable of updating file metadata
for a given media type.</p>
<div class="refsect3">
<a name="rb-metadata-can-save.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>md</p></td>
<td class="parameter_description"><p>a <a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>media_type</p></td>
<td class="parameter_description"><p>the media type string to check</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-metadata-can-save.returns"></a><h4>Returns</h4>
<p> TRUE if the file metadata for the given media type can be updated</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-get-saveable-types"></a><h3>rb_metadata_get_saveable_types ()</h3>
<pre class="programlisting"><span class="returnvalue">char</span> **
rb_metadata_get_saveable_types (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>);</pre>
<p>Constructs a list of the media types for which the metadata backend
implements tag saving.</p>
<div class="refsect3">
<a name="rb-metadata-get-saveable-types.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>md</p></td>
<td class="parameter_description"><p>a <a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-metadata-get-saveable-types.returns"></a><h4>Returns</h4>
<p>a NULL-terminated
array of media type strings.  Use g_strfreev to free it. </p>
<p><span class="annotation">[<a href="http://foldoc.org/transfer%20full"><span class="acronym">transfer full</span></a>][<a href="http://foldoc.org/array"><span class="acronym">array</span></a> zero-terminated=1]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-reset"></a><h3>rb_metadata_reset ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_metadata_reset (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>);</pre>
<p>Resets the state of the metadata interface.  Call this before
setting tags to be written to a file.</p>
<div class="refsect3">
<a name="rb-metadata-reset.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>md</p></td>
<td class="parameter_description"><p>a <a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-load"></a><h3>rb_metadata_load ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_metadata_load (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>,
                  <em class="parameter"><code>const <span class="type">char</span> *uri</code></em>,
                  <em class="parameter"><code><a href="../glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Reads metadata information from the specified URI.
Once this has returned successfully (with *error == NULL),
rb_metadata_get, rb_metadata_get_media_type, rb_metadata_has_missing_plugins,
and rb_metadata_get_missing_plugins can usefully be called.</p>
<div class="refsect3">
<a name="rb-metadata-load.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>md</p></td>
<td class="parameter_description"><p>a <a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>uri</p></td>
<td class="parameter_description"><p>URI from which to load metadata</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>returns error information</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-save"></a><h3>rb_metadata_save ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
rb_metadata_save (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>,
                  <em class="parameter"><code>const <span class="type">char</span> *uri</code></em>,
                  <em class="parameter"><code><a href="../glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Saves all metadata changes made with rb_metadata_set to the
target URI.</p>
<div class="refsect3">
<a name="rb-metadata-save.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>md</p></td>
<td class="parameter_description"><p>a <a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>uri</p></td>
<td class="parameter_description"><p>the target URI</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p>returns error information</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-get-media-type"></a><h3>rb_metadata_get_media_type ()</h3>
<pre class="programlisting">const <span class="returnvalue">char</span> *
rb_metadata_get_media_type (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>);</pre>
<p>Returns the type of the file from which metadata was read.
This may look like a MIME type, but it isn't.</p>
<div class="refsect3">
<a name="rb-metadata-get-media-type.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>md</p></td>
<td class="parameter_description"><p>a <a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-metadata-get-media-type.returns"></a><h4>Returns</h4>
<p> media type string</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-has-missing-plugins"></a><h3>rb_metadata_has_missing_plugins ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_metadata_has_missing_plugins (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>);</pre>
<p>If the metadata reader could not decode the file it was asked to
because one or more media framework plugins (specifically, for the
existing implementations, GStreamer plugins) required are missing,
this will return TRUE.</p>
<div class="refsect3">
<a name="rb-metadata-has-missing-plugins.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>md</p></td>
<td class="parameter_description"><p>a <a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-metadata-has-missing-plugins.returns"></a><h4>Returns</h4>
<p> TRUE if required plugins are missing</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-get-missing-plugins"></a><h3>rb_metadata_get_missing_plugins ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_metadata_get_missing_plugins (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>,
                                 <em class="parameter"><code><span class="type">char</span> ***missing_plugins</code></em>,
                                 <em class="parameter"><code><span class="type">char</span> ***plugin_descriptions</code></em>);</pre>
<p>This function returns the information used to request automatic
installation of media framework plugins required to decode the target URI.
Use <a href="../glib/glib-String-Utility-Functions.html#g-strfreev"><code class="function">g_strfreev()</code></a> to free the returned information arrays.</p>
<div class="refsect3">
<a name="rb-metadata-get-missing-plugins.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>md</p></td>
<td class="parameter_description"><p>a <a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>missing_plugins</p></td>
<td class="parameter_description"><p>returns machine-readable
missing plugin information. </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/out"><span class="acronym">out</span></a>][<a href="http://foldoc.org/array"><span class="acronym">array</span></a> zero-terminated=1]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>plugin_descriptions</p></td>
<td class="parameter_description"><p>returns human-readable
missing plugin descriptions. </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/out"><span class="acronym">out</span></a>][<a href="http://foldoc.org/array"><span class="acronym">array</span></a> zero-terminated=1]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-metadata-get-missing-plugins.returns"></a><h4>Returns</h4>
<p> TRUE if missing plugin information was returned</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-has-audio"></a><h3>rb_metadata_has_audio ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_metadata_has_audio (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-has-video"></a><h3>rb_metadata_has_video ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_metadata_has_video (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-has-other-data"></a><h3>rb_metadata_has_other_data ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_metadata_has_other_data (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-get"></a><h3>rb_metadata_get ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_metadata_get (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>,
                 <em class="parameter"><code><a class="link" href="RBMetaData.html#RBMetaDataField" title="enum RBMetaDataField"><span class="type">RBMetaDataField</span></a> field</code></em>,
                 <em class="parameter"><code><a href="../gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> *val</code></em>);</pre>
<p>Retrieves the value of a metadata field extracted from the target URI.
If the target URI contained no value for the field, returns FALSE.</p>
<div class="refsect3">
<a name="rb-metadata-get.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>md</p></td>
<td class="parameter_description"><p>a <a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>field</p></td>
<td class="parameter_description"><p>the <a class="link" href="RBMetaData.html#RBMetaDataField" title="enum RBMetaDataField"><span class="type">RBMetaDataField</span></a> to retrieve</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>val</p></td>
<td class="parameter_description"><p>returns the field value. </p></td>
<td class="parameter_annotations"><span class="annotation">[<a href="http://foldoc.org/out%20caller-allocates"><span class="acronym">out caller-allocates</span></a>][<a href="http://foldoc.org/transfer%20full"><span class="acronym">transfer full</span></a>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-metadata-get.returns"></a><h4>Returns</h4>
<p> TRUE if a value was returned</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="rb-metadata-set"></a><h3>rb_metadata_set ()</h3>
<pre class="programlisting"><a href="../glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
rb_metadata_set (<em class="parameter"><code><a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> *md</code></em>,
                 <em class="parameter"><code><a class="link" href="RBMetaData.html#RBMetaDataField" title="enum RBMetaDataField"><span class="type">RBMetaDataField</span></a> field</code></em>,
                 <em class="parameter"><code>const <a href="../gobject/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> *val</code></em>);</pre>
<p>Sets a metadata field value.  The value is only stored inside the
<a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a> object until rb_metadata_save is called.</p>
<div class="refsect3">
<a name="rb-metadata-set.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>md</p></td>
<td class="parameter_description"><p>a <a class="link" href="RBMetaData.html" title="RBMetaData"><span class="type">RBMetaData</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>field</p></td>
<td class="parameter_description"><p>the <a class="link" href="RBMetaData.html#RBMetaDataField" title="enum RBMetaDataField"><span class="type">RBMetaDataField</span></a> to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>val</p></td>
<td class="parameter_description"><p>the value to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="rb-metadata-set.returns"></a><h4>Returns</h4>
<p> TRUE if the field is valid</p>
</div>
</div>
</div>
<div class="refsect1">
<a name="RBMetaData.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="RBMetaDataField"></a><h3>enum RBMetaDataField</h3>
<p>Metadata fields that can be read from and written to files.</p>
<div class="refsect3">
<a name="RBMetaDataField.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" 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-METADATA-FIELD-TITLE:CAPS"></a>RB_METADATA_FIELD_TITLE</p></td>
<td class="enum_member_description">
<p>Title of the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-ARTIST:CAPS"></a>RB_METADATA_FIELD_ARTIST</p></td>
<td class="enum_member_description">
<p>Person(s) responsible for the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-ALBUM:CAPS"></a>RB_METADATA_FIELD_ALBUM</p></td>
<td class="enum_member_description">
<p>Album containing the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-DATE:CAPS"></a>RB_METADATA_FIELD_DATE</p></td>
<td class="enum_member_description">
<p>Release date of the album</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-GENRE:CAPS"></a>RB_METADATA_FIELD_GENRE</p></td>
<td class="enum_member_description">
<p>Genre of the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-COMMENT:CAPS"></a>RB_METADATA_FIELD_COMMENT</p></td>
<td class="enum_member_description">
<p>Free form comment on the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-TRACK-NUMBER:CAPS"></a>RB_METADATA_FIELD_TRACK_NUMBER</p></td>
<td class="enum_member_description">
<p>Track number inside a collection</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-MAX-TRACK-NUMBER:CAPS"></a>RB_METADATA_FIELD_MAX_TRACK_NUMBER</p></td>
<td class="enum_member_description">
<p>Count of tracks inside the collection</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-DISC-NUMBER:CAPS"></a>RB_METADATA_FIELD_DISC_NUMBER</p></td>
<td class="enum_member_description">
<p>Disc number inside a collection</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-MAX-DISC-NUMBER:CAPS"></a>RB_METADATA_FIELD_MAX_DISC_NUMBER</p></td>
<td class="enum_member_description">
<p>Count of discs inside the collection</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-DESCRIPTION:CAPS"></a>RB_METADATA_FIELD_DESCRIPTION</p></td>
<td class="enum_member_description">
<p>Short text describing the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-VERSION:CAPS"></a>RB_METADATA_FIELD_VERSION</p></td>
<td class="enum_member_description">
<p>Version of the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-ISRC:CAPS"></a>RB_METADATA_FIELD_ISRC</p></td>
<td class="enum_member_description">
<p>International Standard Recording Code</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-ORGANIZATION:CAPS"></a>RB_METADATA_FIELD_ORGANIZATION</p></td>
<td class="enum_member_description">
<p>Organization responsible for the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-COPYRIGHT:CAPS"></a>RB_METADATA_FIELD_COPYRIGHT</p></td>
<td class="enum_member_description">
<p>Copyright notice on the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-CONTACT:CAPS"></a>RB_METADATA_FIELD_CONTACT</p></td>
<td class="enum_member_description">
<p>Contact information</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-LICENSE:CAPS"></a>RB_METADATA_FIELD_LICENSE</p></td>
<td class="enum_member_description">
<p>License of the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-PERFORMER:CAPS"></a>RB_METADATA_FIELD_PERFORMER</p></td>
<td class="enum_member_description">
<p>Person(s) performing in the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-DURATION:CAPS"></a>RB_METADATA_FIELD_DURATION</p></td>
<td class="enum_member_description">
<p>Duration of the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-CODEC:CAPS"></a>RB_METADATA_FIELD_CODEC</p></td>
<td class="enum_member_description">
<p>Codec used to store the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-BITRATE:CAPS"></a>RB_METADATA_FIELD_BITRATE</p></td>
<td class="enum_member_description">
<p>Exact or average encoding bitrate in bits/s</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-TRACK-GAIN:CAPS"></a>RB_METADATA_FIELD_TRACK_GAIN</p></td>
<td class="enum_member_description">
<p>Track gain in dB for replaygain</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-TRACK-PEAK:CAPS"></a>RB_METADATA_FIELD_TRACK_PEAK</p></td>
<td class="enum_member_description">
<p>Track peak volume level</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-ALBUM-GAIN:CAPS"></a>RB_METADATA_FIELD_ALBUM_GAIN</p></td>
<td class="enum_member_description">
<p>Album gain in dB for replaygain</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-ALBUM-PEAK:CAPS"></a>RB_METADATA_FIELD_ALBUM_PEAK</p></td>
<td class="enum_member_description">
<p>Album peak volume level</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-LANGUAGE-CODE:CAPS"></a>RB_METADATA_FIELD_LANGUAGE_CODE</p></td>
<td class="enum_member_description">
<p>Language code (ISO-639-1)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-BPM:CAPS"></a>RB_METADATA_FIELD_BPM</p></td>
<td class="enum_member_description">
<p>Beats Per Minute</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-MUSICBRAINZ-TRACKID:CAPS"></a>RB_METADATA_FIELD_MUSICBRAINZ_TRACKID</p></td>
<td class="enum_member_description">
<p>MusicBrainz track ID</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-MUSICBRAINZ-ARTISTID:CAPS"></a>RB_METADATA_FIELD_MUSICBRAINZ_ARTISTID</p></td>
<td class="enum_member_description">
<p>MusicBrainz artist ID</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-MUSICBRAINZ-ALBUMID:CAPS"></a>RB_METADATA_FIELD_MUSICBRAINZ_ALBUMID</p></td>
<td class="enum_member_description">
<p>MusicBrainz album ID</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-MUSICBRAINZ-ALBUMARTISTID:CAPS"></a>RB_METADATA_FIELD_MUSICBRAINZ_ALBUMARTISTID</p></td>
<td class="enum_member_description">
<p>MusicBrainz album artist ID</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-ARTIST-SORTNAME:CAPS"></a>RB_METADATA_FIELD_ARTIST_SORTNAME</p></td>
<td class="enum_member_description">
<p>Person(s) responsible for the recording, as used for sorting</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-ALBUM-SORTNAME:CAPS"></a>RB_METADATA_FIELD_ALBUM_SORTNAME</p></td>
<td class="enum_member_description">
<p>Album containing the recording, as used for sorting</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-ALBUM-ARTIST:CAPS"></a>RB_METADATA_FIELD_ALBUM_ARTIST</p></td>
<td class="enum_member_description">
<p>The artist of the entire album</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-ALBUM-ARTIST-SORTNAME:CAPS"></a>RB_METADATA_FIELD_ALBUM_ARTIST_SORTNAME</p></td>
<td class="enum_member_description">
<p>The artist of the entire album, as it should be sorted</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-COMPOSER:CAPS"></a>RB_METADATA_FIELD_COMPOSER</p></td>
<td class="enum_member_description">
<p>The composer of the recording</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-COMPOSER-SORTNAME:CAPS"></a>RB_METADATA_FIELD_COMPOSER_SORTNAME</p></td>
<td class="enum_member_description">
<p>The composer of the recording, as it should be sorted</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-FIELD-LAST:CAPS"></a>RB_METADATA_FIELD_LAST</p></td>
<td class="enum_member_description">
<p>invalid field</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="RBMetaDataError"></a><h3>enum RBMetaDataError</h3>
<div class="refsect3">
<a name="RBMetaDataError.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" 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-METADATA-ERROR-IO:CAPS"></a>RB_METADATA_ERROR_IO</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-ERROR-MISSING-PLUGIN:CAPS"></a>RB_METADATA_ERROR_MISSING_PLUGIN</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-ERROR-UNRECOGNIZED:CAPS"></a>RB_METADATA_ERROR_UNRECOGNIZED</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-ERROR-UNSUPPORTED:CAPS"></a>RB_METADATA_ERROR_UNSUPPORTED</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-ERROR-GENERAL:CAPS"></a>RB_METADATA_ERROR_GENERAL</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-ERROR-INTERNAL:CAPS"></a>RB_METADATA_ERROR_INTERNAL</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="RB-METADATA-ERROR-EMPTY-FILE:CAPS"></a>RB_METADATA_ERROR_EMPTY_FILE</p></td>
<td> </td>
<td> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="RBMetaData-struct"></a><h3>struct RBMetaData</h3>
<pre class="programlisting">struct RBMetaData;</pre>
</div>
<hr>
<div class="refsect2">
<a name="RBMetaDataClass"></a><h3>struct RBMetaDataClass</h3>
<pre class="programlisting">struct RBMetaDataClass {
	GObjectClass parent_class;
};
</pre>
</div>
</div>
</div>
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