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<h2><span class="refentrytitle"><a name="gstreamer-GstMiniObject.top_of_page"></a>GstMiniObject</span></h2>
<p>GstMiniObject — Lightweight base class for the GStreamer object hierarchy</p>
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<a name="gstreamer-GstMiniObject.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/gst.h>
struct <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject">GstMiniObject</a>;
enum <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectFlags" title="enum GstMiniObjectFlags">GstMiniObjectFlags</a>;
<a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="returnvalue">GstMiniObject</span></a> * (<a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectCopyFunction" title="GstMiniObjectCopyFunction ()">*GstMiniObjectCopyFunction</a>) (<em class="parameter"><code>const <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *obj</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="gstreamer-GstMiniObject.html#GstMiniObjectDisposeFunction" title="GstMiniObjectDisposeFunction ()">*GstMiniObjectDisposeFunction</a>) (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *obj</code></em>);
<span class="returnvalue">void</span> (<a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectFreeFunction" title="GstMiniObjectFreeFunction ()">*GstMiniObjectFreeFunction</a>) (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *obj</code></em>);
<span class="returnvalue">void</span> (<a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectWeakNotify" title="GstMiniObjectWeakNotify ()">*GstMiniObjectWeakNotify</a>) (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *where_the_mini_object_was</code></em>);
#define <a class="link" href="gstreamer-GstMiniObject.html#GST-MINI-OBJECT-TYPE:CAPS" title="GST_MINI_OBJECT_TYPE()">GST_MINI_OBJECT_TYPE</a> (obj)
#define <a class="link" href="gstreamer-GstMiniObject.html#GST-MINI-OBJECT-FLAGS:CAPS" title="GST_MINI_OBJECT_FLAGS()">GST_MINI_OBJECT_FLAGS</a> (obj)
#define <a class="link" href="gstreamer-GstMiniObject.html#GST-MINI-OBJECT-FLAG-IS-SET:CAPS" title="GST_MINI_OBJECT_FLAG_IS_SET()">GST_MINI_OBJECT_FLAG_IS_SET</a> (obj,
flag)
#define <a class="link" href="gstreamer-GstMiniObject.html#GST-MINI-OBJECT-FLAG-SET:CAPS" title="GST_MINI_OBJECT_FLAG_SET()">GST_MINI_OBJECT_FLAG_SET</a> (obj,
flag)
#define <a class="link" href="gstreamer-GstMiniObject.html#GST-MINI-OBJECT-FLAG-UNSET:CAPS" title="GST_MINI_OBJECT_FLAG_UNSET()">GST_MINI_OBJECT_FLAG_UNSET</a> (obj,
flag)
#define <a class="link" href="gstreamer-GstMiniObject.html#GST-MINI-OBJECT-REFCOUNT:CAPS" title="GST_MINI_OBJECT_REFCOUNT()">GST_MINI_OBJECT_REFCOUNT</a> (obj)
#define <a class="link" href="gstreamer-GstMiniObject.html#GST-MINI-OBJECT-REFCOUNT-VALUE:CAPS" title="GST_MINI_OBJECT_REFCOUNT_VALUE()">GST_MINI_OBJECT_REFCOUNT_VALUE</a> (obj)
#define <a class="link" href="gstreamer-GstMiniObject.html#GST-MINI-OBJECT-SIZE:CAPS" title="GST_MINI_OBJECT_SIZE()">GST_MINI_OBJECT_SIZE</a> (obj)
#define <a class="link" href="gstreamer-GstMiniObject.html#GST-DEFINE-MINI-OBJECT-TYPE:CAPS" title="GST_DEFINE_MINI_OBJECT_TYPE()">GST_DEFINE_MINI_OBJECT_TYPE</a> (TypeName,
type_name)
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-init" title="gst_mini_object_init ()">gst_mini_object_init</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *mini_object</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> type</code></em>,
<em class="parameter"><code><span class="type">gsize</span> size</code></em>);
<a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="returnvalue">GstMiniObject</span></a> * <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-copy" title="gst_mini_object_copy ()">gst_mini_object_copy</a> (<em class="parameter"><code>const <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *mini_object</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="gstreamer-GstMiniObject.html#gst-mini-object-is-writable" title="gst_mini_object_is_writable ()">gst_mini_object_is_writable</a> (<em class="parameter"><code>const <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *mini_object</code></em>);
<a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="returnvalue">GstMiniObject</span></a> * <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-make-writable" title="gst_mini_object_make_writable ()">gst_mini_object_make_writable</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *mini_object</code></em>);
<a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="returnvalue">GstMiniObject</span></a> * <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-ref" title="gst_mini_object_ref ()">gst_mini_object_ref</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *mini_object</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-unref" title="gst_mini_object_unref ()">gst_mini_object_unref</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *mini_object</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-weak-ref" title="gst_mini_object_weak_ref ()">gst_mini_object_weak_ref</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *object</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectWeakNotify" title="GstMiniObjectWeakNotify ()"><span class="type">GstMiniObjectWeakNotify</span></a> notify</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-weak-unref" title="gst_mini_object_weak_unref ()">gst_mini_object_weak_unref</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *object</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectWeakNotify" title="GstMiniObjectWeakNotify ()"><span class="type">GstMiniObjectWeakNotify</span></a> notify</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</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="gstreamer-GstMiniObject.html#gst-mini-object-replace" title="gst_mini_object_replace ()">gst_mini_object_replace</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> **olddata</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *newdata</code></em>);
<a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="returnvalue">GstMiniObject</span></a> * <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-steal" title="gst_mini_object_steal ()">gst_mini_object_steal</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> **olddata</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="gstreamer-GstMiniObject.html#gst-mini-object-take" title="gst_mini_object_take ()">gst_mini_object_take</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> **olddata</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *newdata</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gstreamer-GstMiniObject.description"></a><h2>Description</h2>
<p>
<a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> is a simple structure that can be used to implement refcounted
types.
</p>
<p>
Subclasses will include <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> as the first member in their structure
and then call <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-init" title="gst_mini_object_init ()"><code class="function">gst_mini_object_init()</code></a> to initialize the <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> fields.
</p>
<p>
<a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-ref" title="gst_mini_object_ref ()"><code class="function">gst_mini_object_ref()</code></a> and <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-unref" title="gst_mini_object_unref ()"><code class="function">gst_mini_object_unref()</code></a> increment and decrement the
refcount respectively. When the refcount of a mini-object reaches 0, the
dispose function is called first and when this returns <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, the free
function of the miniobject is called.
</p>
<p>
A copy can be made with <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-copy" title="gst_mini_object_copy ()"><code class="function">gst_mini_object_copy()</code></a>.
</p>
<p>
<a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-is-writable" title="gst_mini_object_is_writable ()"><code class="function">gst_mini_object_is_writable()</code></a> will return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> when the refcount of the
object is exactly 1, meaning the current caller has the only reference to the
object. <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-make-writable" title="gst_mini_object_make_writable ()"><code class="function">gst_mini_object_make_writable()</code></a> will return a writable version of the
object, which might be a new copy when the refcount was not 1.
</p>
<p>
Last reviewed on 2012-03-28 (0.11.3)
</p>
</div>
<div class="refsect1">
<a name="gstreamer-GstMiniObject.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstMiniObject"></a><h3>struct GstMiniObject</h3>
<pre class="programlisting">struct GstMiniObject {
GType type;
gint refcount;
guint flags;
gsize size;
GstMiniObjectCopyFunction copy;
GstMiniObjectDisposeFunction dispose;
GstMiniObjectFreeFunction free;
};
</pre>
<p>
Base class for refcounted lightweight objects.
Ref Func: gst_mini_object_ref
Unref Func: gst_mini_object_unref
Set Value Func: g_value_set_boxed
Get Value Func: g_value_get_boxed
</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#GType"><span class="type">GType</span></a> <em class="structfield"><code><a name="GstMiniObject.type"></a>type</code></em>;</span></p></td>
<td>the GType of the object</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstMiniObject.refcount"></a>refcount</code></em>;</span></p></td>
<td>atomic refcount</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstMiniObject.flags"></a>flags</code></em>;</span></p></td>
<td>extra flags.</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">gsize</span> <em class="structfield"><code><a name="GstMiniObject.size"></a>size</code></em>;</span></p></td>
<td>the size of the structure</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectCopyFunction" title="GstMiniObjectCopyFunction ()"><span class="type">GstMiniObjectCopyFunction</span></a> <em class="structfield"><code><a name="GstMiniObject.copy"></a>copy</code></em>;</span></p></td>
<td>a copy function</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectDisposeFunction" title="GstMiniObjectDisposeFunction ()"><span class="type">GstMiniObjectDisposeFunction</span></a> <em class="structfield"><code><a name="GstMiniObject.dispose"></a>dispose</code></em>;</span></p></td>
<td>a dispose function</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectFreeFunction" title="GstMiniObjectFreeFunction ()"><span class="type">GstMiniObjectFreeFunction</span></a> <em class="structfield"><code><a name="GstMiniObject.free"></a>free</code></em>;</span></p></td>
<td>the free function</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstMiniObjectFlags"></a><h3>enum GstMiniObjectFlags</h3>
<pre class="programlisting">typedef enum {
/* padding */
GST_MINI_OBJECT_FLAG_LAST = (1<<4)
} GstMiniObjectFlags;
</pre>
<p>
Flags for the mini object
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><a name="GST-MINI-OBJECT-FLAG-LAST:CAPS"></a><span class="term"><code class="literal">GST_MINI_OBJECT_FLAG_LAST</code></span></p></td>
<td>first flag that can be used by subclasses.
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstMiniObjectCopyFunction"></a><h3>GstMiniObjectCopyFunction ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="returnvalue">GstMiniObject</span></a> * (*GstMiniObjectCopyFunction) (<em class="parameter"><code>const <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *obj</code></em>);</pre>
<p>
Function prototype for methods to create copies of instances.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>MiniObject to copy</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>reference to cloned instance.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstMiniObjectDisposeFunction"></a><h3>GstMiniObjectDisposeFunction ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (*GstMiniObjectDisposeFunction) (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *obj</code></em>);</pre>
<p>
Function prototype for when a miniobject has lost its last refcount.
Implementation of the mini object are allowed to revive the
passed object by doing a <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-ref" title="gst_mini_object_ref ()"><code class="function">gst_mini_object_ref()</code></a>. If the object is not
revived after the dispose function, the function should return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>
and the memory associated with the object is freed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>MiniObject to dispose</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> if the object should be cleaned up.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstMiniObjectFreeFunction"></a><h3>GstMiniObjectFreeFunction ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*GstMiniObjectFreeFunction) (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *obj</code></em>);</pre>
<p>
Virtual function prototype for methods to free ressources used by
mini-objects.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>MiniObject to free</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstMiniObjectWeakNotify"></a><h3>GstMiniObjectWeakNotify ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*GstMiniObjectWeakNotify) (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *where_the_mini_object_was</code></em>);</pre>
<p>
A <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectWeakNotify" title="GstMiniObjectWeakNotify ()"><span class="type">GstMiniObjectWeakNotify</span></a> function can be added to a mini object as a
callback that gets triggered when the mini object is finalized. Since the
mini object is already being finalized when the <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectWeakNotify" title="GstMiniObjectWeakNotify ()"><span class="type">GstMiniObjectWeakNotify</span></a> is
called, there's not much you could do with the object, apart from e.g. using
its adress as hash-index or the like.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>data that was provided when the weak reference was established</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>where_the_mini_object_was</code></em> :</span></p></td>
<td>the mini object being finalized</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.35</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-MINI-OBJECT-TYPE:CAPS"></a><h3>GST_MINI_OBJECT_TYPE()</h3>
<pre class="programlisting">#define GST_MINI_OBJECT_TYPE(obj) (GST_MINI_OBJECT_CAST(obj)->type)
</pre>
<p>
This macro returns the type of the mini-object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>MiniObject to return type for.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MINI-OBJECT-FLAGS:CAPS"></a><h3>GST_MINI_OBJECT_FLAGS()</h3>
<pre class="programlisting">#define GST_MINI_OBJECT_FLAGS(obj) (GST_MINI_OBJECT_CAST(obj)->flags)
</pre>
<p>
This macro returns the entire set of flags for the mini-object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>MiniObject to return flags for.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MINI-OBJECT-FLAG-IS-SET:CAPS"></a><h3>GST_MINI_OBJECT_FLAG_IS_SET()</h3>
<pre class="programlisting">#define GST_MINI_OBJECT_FLAG_IS_SET(obj,flag) !!(GST_MINI_OBJECT_FLAGS (obj) & (flag))
</pre>
<p>
This macro checks to see if the given flag is set.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>MiniObject to check for flags.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flag</code></em> :</span></p></td>
<td>Flag to check for</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MINI-OBJECT-FLAG-SET:CAPS"></a><h3>GST_MINI_OBJECT_FLAG_SET()</h3>
<pre class="programlisting">#define GST_MINI_OBJECT_FLAG_SET(obj,flag) (GST_MINI_OBJECT_FLAGS (obj) |= (flag))
</pre>
<p>
This macro sets the given bits.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>MiniObject to set flag in.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flag</code></em> :</span></p></td>
<td>Flag to set, can by any number of bits in guint32.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MINI-OBJECT-FLAG-UNSET:CAPS"></a><h3>GST_MINI_OBJECT_FLAG_UNSET()</h3>
<pre class="programlisting">#define GST_MINI_OBJECT_FLAG_UNSET(obj,flag) (GST_MINI_OBJECT_FLAGS (obj) &= ~(flag))
</pre>
<p>
This macro usets the given bits.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>MiniObject to unset flag in.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flag</code></em> :</span></p></td>
<td>Flag to set, must be a single bit in guint32.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MINI-OBJECT-REFCOUNT:CAPS"></a><h3>GST_MINI_OBJECT_REFCOUNT()</h3>
<pre class="programlisting">#define GST_MINI_OBJECT_REFCOUNT(obj) ((GST_MINI_OBJECT_CAST(obj))->refcount)
</pre>
<p>
Get access to the reference count field of the mini-object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MINI-OBJECT-REFCOUNT-VALUE:CAPS"></a><h3>GST_MINI_OBJECT_REFCOUNT_VALUE()</h3>
<pre class="programlisting">#define GST_MINI_OBJECT_REFCOUNT_VALUE(obj) (g_atomic_int_get (&(GST_MINI_OBJECT_CAST(obj))->refcount))
</pre>
<p>
Get the reference count value of the mini-object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MINI-OBJECT-SIZE:CAPS"></a><h3>GST_MINI_OBJECT_SIZE()</h3>
<pre class="programlisting">#define GST_MINI_OBJECT_SIZE(obj) ((GST_MINI_OBJECT_CAST(obj))->size)
</pre>
<p>
Get the allocated size of <em class="parameter"><code>obj</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-DEFINE-MINI-OBJECT-TYPE:CAPS"></a><h3>GST_DEFINE_MINI_OBJECT_TYPE()</h3>
<pre class="programlisting">#define GST_DEFINE_MINI_OBJECT_TYPE(TypeName,type_name)</pre>
<p>
Define a new mini-object type with the given name
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>TypeName</code></em> :</span></p></td>
<td>name of the new type in CamelCase</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type_name</code></em> :</span></p></td>
<td>name of the new type</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mini-object-init"></a><h3>gst_mini_object_init ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mini_object_init (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *mini_object</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> type</code></em>,
<em class="parameter"><code><span class="type">gsize</span> size</code></em>);</pre>
<p>
Initializes a mini-object with the desired type and size.
</p>
<p>
MT safe
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mini_object</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>the <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> of the mini-object to create</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>the size of the data</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new mini-object. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mini-object-copy"></a><h3>gst_mini_object_copy ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="returnvalue">GstMiniObject</span></a> * gst_mini_object_copy (<em class="parameter"><code>const <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *mini_object</code></em>);</pre>
<p>
Creates a copy of the mini-object.
</p>
<p>
MT safe
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mini_object</code></em> :</span></p></td>
<td>the mini-object to copy</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new mini-object. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mini-object-is-writable"></a><h3>gst_mini_object_is_writable ()</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_mini_object_is_writable (<em class="parameter"><code>const <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *mini_object</code></em>);</pre>
<p>
Checks if a mini-object is writable. A mini-object is writable
if the reference count is one. Modification of a mini-object should
only be done after verifying that it is writable.
</p>
<p>
MT safe
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mini_object</code></em> :</span></p></td>
<td>the mini-object to check</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if the object is writable.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mini-object-make-writable"></a><h3>gst_mini_object_make_writable ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="returnvalue">GstMiniObject</span></a> * gst_mini_object_make_writable (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *mini_object</code></em>);</pre>
<p>
Checks if a mini-object is writable. If not, a writable copy is made and
returned. This gives away the reference to the original mini object,
and returns a reference to the new object.
</p>
<p>
MT safe
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mini_object</code></em> :</span></p></td>
<td>the mini-object to make writable. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a mini-object (possibly the same pointer) that
is writable. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mini-object-ref"></a><h3>gst_mini_object_ref ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="returnvalue">GstMiniObject</span></a> * gst_mini_object_ref (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *mini_object</code></em>);</pre>
<p>
Increase the reference count of the mini-object.
</p>
<p>
Note that the refcount affects the writeability
of <em class="parameter"><code>mini</code></em>-object, see <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-is-writable" title="gst_mini_object_is_writable ()"><code class="function">gst_mini_object_is_writable()</code></a>. It is
important to note that keeping additional references to
GstMiniObject instances can potentially increase the number
of memcpy operations in a pipeline, especially if the miniobject
is a <a class="link" href="gstreamer-GstBuffer.html#GstBuffer" title="struct GstBuffer"><span class="type">GstBuffer</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>mini_object</code></em> :</span></p></td>
<td>the mini-object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the mini-object. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mini-object-unref"></a><h3>gst_mini_object_unref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mini_object_unref (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *mini_object</code></em>);</pre>
<p>
Decreases the reference count of the mini-object, possibly freeing
the mini-object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>mini_object</code></em> :</span></p></td>
<td>the mini-object</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mini-object-weak-ref"></a><h3>gst_mini_object_weak_ref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mini_object_weak_ref (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *object</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectWeakNotify" title="GstMiniObjectWeakNotify ()"><span class="type">GstMiniObjectWeakNotify</span></a> notify</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
<p>
Adds a weak reference callback to a mini object. Weak references are
used for notification when a mini object is finalized. They are called
"weak references" because they allow you to safely hold a pointer
to the mini object without calling <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-ref" title="gst_mini_object_ref ()"><code class="function">gst_mini_object_ref()</code></a>
(<a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-ref" title="gst_mini_object_ref ()"><code class="function">gst_mini_object_ref()</code></a> adds a strong reference, that is, forces the object
to stay alive).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>
<a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> to reference weakly</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>callback to invoke before the mini object is freed</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>extra data to pass to notify</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.35</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-mini-object-weak-unref"></a><h3>gst_mini_object_weak_unref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_mini_object_weak_unref (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *object</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObjectWeakNotify" title="GstMiniObjectWeakNotify ()"><span class="type">GstMiniObjectWeakNotify</span></a> notify</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
<p>
Removes a weak reference callback to a mini object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>
<a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> to remove a weak reference from</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>notify</code></em> :</span></p></td>
<td>callback to search for</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>data to search for</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.35</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-mini-object-replace"></a><h3>gst_mini_object_replace ()</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_mini_object_replace (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> **olddata</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *newdata</code></em>);</pre>
<p>
Atomically modifies a pointer to point to a new mini-object.
The reference count of <em class="parameter"><code>olddata</code></em> is decreased and the reference count of
<em class="parameter"><code>newdata</code></em> is increased.
</p>
<p>
Either <em class="parameter"><code>newdata</code></em> and the value pointed to by <em class="parameter"><code>olddata</code></em> may be NULL.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>olddata</code></em> :</span></p></td>
<td>pointer to a pointer to a mini-object to
be replaced. <span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>newdata</code></em> :</span></p></td>
<td>pointer to new mini-object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if <em class="parameter"><code>newdata</code></em> was different from <em class="parameter"><code>olddata</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mini-object-steal"></a><h3>gst_mini_object_steal ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="returnvalue">GstMiniObject</span></a> * gst_mini_object_steal (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> **olddata</code></em>);</pre>
<p>
Replace the current <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> pointer to by <em class="parameter"><code>olddata</code></em> with NULL and
return the old value.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>olddata</code></em> :</span></p></td>
<td>pointer to a pointer to a mini-object to
be stolen. <span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> at <em class="parameter"><code>oldata</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-mini-object-take"></a><h3>gst_mini_object_take ()</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_mini_object_take (<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> **olddata</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> *newdata</code></em>);</pre>
<p>
Modifies a pointer to point to a new mini-object. The modification
is done atomically. This version is similar to <a class="link" href="gstreamer-GstMiniObject.html#gst-mini-object-replace" title="gst_mini_object_replace ()"><code class="function">gst_mini_object_replace()</code></a>
except that it does not increase the refcount of <em class="parameter"><code>newdata</code></em> and thus
takes ownership of <em class="parameter"><code>newdata</code></em>.
</p>
<p>
Either <em class="parameter"><code>newdata</code></em> and the value pointed to by <em class="parameter"><code>olddata</code></em> may be NULL.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>olddata</code></em> :</span></p></td>
<td>pointer to a pointer to a mini-object to
be replaced. <span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>newdata</code></em> :</span></p></td>
<td>pointer to new mini-object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if <em class="parameter"><code>newdata</code></em> was different from <em class="parameter"><code>olddata</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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