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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>GstPreset</title>
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<a href="#GstPreset.synopsis" class="shortcut">Top</a>
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<a href="#GstPreset.description" class="shortcut">Description</a>
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<a href="#GstPreset.object-hierarchy" class="shortcut">Object Hierarchy</a>
</td></tr>
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<div class="refentry">
<a name="GstPreset"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GstPreset.top_of_page"></a>GstPreset</span></h2>
<p>GstPreset — helper interface for element presets</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="GstPreset.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/gst.h>
<a class="link" href="GstPreset.html#GstPreset-struct" title="GstPreset">GstPreset</a>;
struct <a class="link" href="GstPreset.html#GstPresetInterface" title="struct GstPresetInterface">GstPresetInterface</a>;
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> ** <a class="link" href="GstPreset.html#gst-preset-get-preset-names" title="gst_preset_get_preset_names ()">gst_preset_get_preset_names</a> (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> ** <a class="link" href="GstPreset.html#gst-preset-get-property-names" title="gst_preset_get_property_names ()">gst_preset_get_property_names</a> (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPreset.html#gst-preset-load-preset" title="gst_preset_load_preset ()">gst_preset_load_preset</a> (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPreset.html#gst-preset-save-preset" title="gst_preset_save_preset ()">gst_preset_save_preset</a> (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPreset.html#gst-preset-rename-preset" title="gst_preset_rename_preset ()">gst_preset_rename_preset</a> (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *old_name</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *new_name</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPreset.html#gst-preset-delete-preset" title="gst_preset_delete_preset ()">gst_preset_delete_preset</a> (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPreset.html#gst-preset-set-meta" title="gst_preset_set_meta ()">gst_preset_set_meta</a> (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *tag</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *value</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstPreset.html#gst-preset-get-meta" title="gst_preset_get_meta ()">gst_preset_get_meta</a> (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *tag</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **value</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GstPreset.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
GInterface
+----GstPreset
</pre>
</div>
<div class="refsect1">
<a name="GstPreset.description"></a><h2>Description</h2>
<p>
This interface offers methods to query and manipulate parameter preset sets.
A preset is a bunch of property settings, together with meta data and a name.
The name of a preset serves as key for subsequent method calls to manipulate
single presets.
All instances of one type will share the list of presets. The list is created
on demand, if presets are not used, the list is not created.
</p>
<p>
The interface comes with a default implementation that serves most plugins.
Wrapper plugins will override most methods to implement support for the
native preset format of those wrapped plugins.
One method that is useful to be overridden is <a class="link" href="GstPreset.html#gst-preset-get-property-names" title="gst_preset_get_property_names ()"><code class="function">gst_preset_get_property_names()</code></a>.
With that one can control which properties are saved and in which order.
</p>
</div>
<div class="refsect1">
<a name="GstPreset.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstPreset-struct"></a><h3>GstPreset</h3>
<pre class="programlisting">typedef struct _GstPreset GstPreset;</pre>
<p>
Opaque <a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> data structure.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GstPresetInterface"></a><h3>struct GstPresetInterface</h3>
<pre class="programlisting">struct GstPresetInterface {
GTypeInterface parent;
/* methods */
gchar** (*get_preset_names) (GstPreset *preset);
gchar** (*get_property_names) (GstPreset *preset);
gboolean (*load_preset) (GstPreset *preset, const gchar *name);
gboolean (*save_preset) (GstPreset *preset, const gchar *name);
gboolean (*rename_preset) (GstPreset *preset, const gchar *old_name,
const gchar *new_name);
gboolean (*delete_preset) (GstPreset *preset, const gchar *name);
gboolean (*set_meta) (GstPreset *preset, const gchar *name,
const gchar *tag, const gchar *value);
gboolean (*get_meta) (GstPreset *preset, const gchar *name,
const gchar *tag, gchar **value);
};
</pre>
<p>
<a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> interface.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GTypeInterface"><span class="type">GTypeInterface</span></a> <em class="structfield"><code><a name="GstPresetInterface.parent"></a>parent</code></em>;</span></p></td>
<td>parent interface type.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstPresetInterface.get-preset-names"></a>get_preset_names</code></em> ()</span></p></td>
<td>virtual method to get list of presets</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstPresetInterface.get-property-names"></a>get_property_names</code></em> ()</span></p></td>
<td>virtual methods to get properties that are persistent</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstPresetInterface.load-preset"></a>load_preset</code></em> ()</span></p></td>
<td>virtual methods to load a preset into properties</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstPresetInterface.save-preset"></a>save_preset</code></em> ()</span></p></td>
<td>virtual methods to save properties into a preset</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstPresetInterface.rename-preset"></a>rename_preset</code></em> ()</span></p></td>
<td>virtual methods to rename a preset</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstPresetInterface.delete-preset"></a>delete_preset</code></em> ()</span></p></td>
<td>virtual methods to remove a preset</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstPresetInterface.set-meta"></a>set_meta</code></em> ()</span></p></td>
<td>virtual methods to set textual meta data to a preset</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstPresetInterface.get-meta"></a>get_meta</code></em> ()</span></p></td>
<td>virtual methods to get textual meta data from a preset</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-preset-get-preset-names"></a><h3>gst_preset_get_preset_names ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> ** gst_preset_get_preset_names (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>);</pre>
<p>
Get a copy of preset names as a NULL terminated string array.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>preset</code></em> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> that implements <a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>list with names, ue <a href="http://library.gnome.org/devel/glib/unstable/glib-String-Utility-Functions.html#g-strfreev"><code class="function">g_strfreev()</code></a> after usage. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> gchar*]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.20</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-preset-get-property-names"></a><h3>gst_preset_get_property_names ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> ** gst_preset_get_property_names (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>);</pre>
<p>
Get a the names of the GObject properties that can be used for presets.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>preset</code></em> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> that implements <a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>an
array of property names which should be freed with <a href="http://library.gnome.org/devel/glib/unstable/glib-String-Utility-Functions.html#g-strfreev"><code class="function">g_strfreev()</code></a> after use. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> gchar*]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.20</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-preset-load-preset"></a><h3>gst_preset_load_preset ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_preset_load_preset (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
<p>
Load the given preset.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>preset</code></em> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> that implements <a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>preset name to load</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> for success, <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if e.g. there is no preset with that <em class="parameter"><code>name</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.20</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-preset-save-preset"></a><h3>gst_preset_save_preset ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_preset_save_preset (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
<p>
Save the current object settings as a preset under the given name. If there
is already a preset by this <em class="parameter"><code>name</code></em> it will be overwritten.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>preset</code></em> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> that implements <a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>preset name to save</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> for success, <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.20</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-preset-rename-preset"></a><h3>gst_preset_rename_preset ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_preset_rename_preset (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *old_name</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *new_name</code></em>);</pre>
<p>
Renames a preset. If there is already a preset by the <em class="parameter"><code>new_name</code></em> it will be
overwritten.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>preset</code></em> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> that implements <a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>old_name</code></em> :</span></p></td>
<td>current preset name</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>new_name</code></em> :</span></p></td>
<td>new preset name</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> for success, <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if e.g. there is no preset with <em class="parameter"><code>old_name</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.20</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-preset-delete-preset"></a><h3>gst_preset_delete_preset ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_preset_delete_preset (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
<p>
Delete the given preset.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>preset</code></em> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> that implements <a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>preset name to remove</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> for success, <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if e.g. there is no preset with that <em class="parameter"><code>name</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.20</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-preset-set-meta"></a><h3>gst_preset_set_meta ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_preset_set_meta (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *tag</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *value</code></em>);</pre>
<p>
Sets a new <em class="parameter"><code>value</code></em> for an existing meta data item or adds a new item. Meta
data <em class="parameter"><code>tag</code></em> names can be something like e.g. "comment". Supplying <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for the
<em class="parameter"><code>value</code></em> will unset an existing value.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>preset</code></em> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> that implements <a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>preset name</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>tag</code></em> :</span></p></td>
<td>meta data item name</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>new value</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> for success, <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if e.g. there is no preset with that <em class="parameter"><code>name</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.20</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-preset-get-meta"></a><h3>gst_preset_get_meta ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_preset_get_meta (<em class="parameter"><code><a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a> *preset</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *tag</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **value</code></em>);</pre>
<p>
Gets the <em class="parameter"><code>value</code></em> for an existing meta data <em class="parameter"><code>tag</code></em>. Meta data <em class="parameter"><code>tag</code></em> names can be
something like e.g. "comment". Returned values need to be released when done.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>preset</code></em> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> that implements <a class="link" href="GstPreset.html" title="GstPreset"><span class="type">GstPreset</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>preset name</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>tag</code></em> :</span></p></td>
<td>meta data item name</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>value. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym> callee-allocates]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> for success, <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if e.g. there is no preset with that <em class="parameter"><code>name</code></em>
or no value for the given <em class="parameter"><code>tag</code></em>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.20</p>
</div>
</div>
</div>
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