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<div class="refentry" title="GstPreset">
<a name="gst-buzztard-GstPreset"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-buzztard-GstPreset.top_of_page"></a>GstPreset</span></h2>
<p>GstPreset — helper interface for element presets</p>
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<div class="refsynopsisdiv" title="Synopsis">
<a name="gst-buzztard-GstPreset.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"><span class="returnvalue">gchar</span>** <a class="link" href="gst-buzztard-GstPreset.html#gst-preset-get-preset-names" title="gst_preset_get_preset_names ()">gst_preset_get_preset_names</a> (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="gst-buzztard-GstPreset.html#gst-preset-load-preset" title="gst_preset_load_preset ()">gst_preset_load_preset</a> (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="gst-buzztard-GstPreset.html#gst-preset-save-preset" title="gst_preset_save_preset ()">gst_preset_save_preset</a> (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="gst-buzztard-GstPreset.html#gst-preset-rename-preset" title="gst_preset_rename_preset ()">gst_preset_rename_preset</a> (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *old_name</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *new_name</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="gst-buzztard-GstPreset.html#gst-preset-delete-preset" title="gst_preset_delete_preset ()">gst_preset_delete_preset</a> (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="gst-buzztard-GstPreset.html#gst-preset-set-meta" title="gst_preset_set_meta ()">gst_preset_set_meta</a> (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *tag</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *value</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="gst-buzztard-GstPreset.html#gst-preset-get-meta" title="gst_preset_get_meta ()">gst_preset_get_meta</a> (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *tag</code></em>,
<em class="parameter"><code><span class="type">gchar</span> **value</code></em>);
</pre>
</div>
<div class="refsect1" title="Description">
<a name="gst-buzztard-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 <code class="function">gst_preset_get_property_names()</code>.
With that one can control which properties are saved and in which order.
</p>
</div>
<div class="refsect1" title="Details">
<a name="gst-buzztard-GstPreset.details"></a><h2>Details</h2>
<div class="refsect2" title="gst_preset_get_preset_names ()">
<a name="gst-preset-get-preset-names"></a><h3>gst_preset_get_preset_names ()</h3>
<pre class="programlisting"><span class="returnvalue">gchar</span>** gst_preset_get_preset_names (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>);</pre>
<p>
Get a copy of preset names as a NULL terminated string array. Free with
<code class="function">g_strfreev()</code> wen done.
</p>
<div class="variablelist"><table border="0">
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<tbody>
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<td><p><span class="term"><em class="parameter"><code>self</code></em> :</span></p></td>
<td>a <span class="type">GObject</span> that implements <span class="type">GstPreset</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> list with names
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_preset_load_preset ()">
<a name="gst-preset-load-preset"></a><h3>gst_preset_load_preset ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> gst_preset_load_preset (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>);</pre>
<p>
Load the given preset.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
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<tr>
<td><p><span class="term"><em class="parameter"><code>self</code></em> :</span></p></td>
<td>a <span class="type">GObject</span> that implements <span class="type">GstPreset</span>
</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> <code class="literal">TRUE</code> for success, <code class="literal">FALSE</code> if e.g. there is no preset with that <em class="parameter"><code>name</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_preset_save_preset ()">
<a name="gst-preset-save-preset"></a><h3>gst_preset_save_preset ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> gst_preset_save_preset (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>);</pre>
<p>
Save the current 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>self</code></em> :</span></p></td>
<td>a <span class="type">GObject</span> that implements <span class="type">GstPreset</span>
</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> <code class="literal">TRUE</code> for success, <code class="literal">FALSE</code>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_preset_rename_preset ()">
<a name="gst-preset-rename-preset"></a><h3>gst_preset_rename_preset ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> gst_preset_rename_preset (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *old_name</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *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>self</code></em> :</span></p></td>
<td>a <span class="type">GObject</span> that implements <span class="type">GstPreset</span>
</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> <code class="literal">TRUE</code> for success, <code class="literal">FALSE</code> if e.g. there is no preset with <em class="parameter"><code>old_name</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_preset_delete_preset ()">
<a name="gst-preset-delete-preset"></a><h3>gst_preset_delete_preset ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> gst_preset_delete_preset (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *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>self</code></em> :</span></p></td>
<td>a <span class="type">GObject</span> that implements <span class="type">GstPreset</span>
</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> <code class="literal">TRUE</code> for success, <code class="literal">FALSE</code> if e.g. there is no preset with that <em class="parameter"><code>name</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_preset_set_meta ()">
<a name="gst-preset-set-meta"></a><h3>gst_preset_set_meta ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> gst_preset_set_meta (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *tag</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *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 <code class="literal">NULL</code> 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>self</code></em> :</span></p></td>
<td>a <span class="type">GObject</span> that implements <span class="type">GstPreset</span>
</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> <code class="literal">TRUE</code> for success, <code class="literal">FALSE</code> if e.g. there is no preset with that <em class="parameter"><code>name</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="gst_preset_get_meta ()">
<a name="gst-preset-get-meta"></a><h3>gst_preset_get_meta ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> gst_preset_get_meta (<em class="parameter"><code><span class="type">GstPreset</span> *self</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *tag</code></em>,
<em class="parameter"><code><span class="type">gchar</span> **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>self</code></em> :</span></p></td>
<td>a <span class="type">GObject</span> that implements <span class="type">GstPreset</span>
</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
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> <code class="literal">TRUE</code> for success, <code class="literal">FALSE</code> 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>
</div>
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