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<a name="GstBaseTransform"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GstBaseTransform.top_of_page"></a>GstBaseTransform</span></h2>
<p>GstBaseTransform</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
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<div class="refsect1">
<a name="GstBaseTransform.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="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBaseTransform.html#gst-base-transform-is-passthrough" title="gst_base_transform_is_passthrough ()">gst_base_transform_is_passthrough</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="GstBaseTransform.html#gst-base-transform-set-passthrough" title="gst_base_transform_set_passthrough ()">gst_base_transform_set_passthrough</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="GstBaseTransform.html#gst-base-transform-set-prefer-passthrough" title="gst_base_transform_set_prefer_passthrough ()">gst_base_transform_set_prefer_passthrough</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBaseTransform.html#gst-base-transform-is-in-place" title="gst_base_transform_is_in_place ()">gst_base_transform_is_in_place</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="GstBaseTransform.html#gst-base-transform-set-in-place" title="gst_base_transform_set_in_place ()">gst_base_transform_set_in_place</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBaseTransform.html#gst-base-transform-is-qos-enabled" title="gst_base_transform_is_qos_enabled ()">gst_base_transform_is_qos_enabled</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="GstBaseTransform.html#gst-base-transform-set-qos-enabled" title="gst_base_transform_set_qos_enabled ()">gst_base_transform_set_qos_enabled</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="GstBaseTransform.html#gst-base-transform-update-qos" title="gst_base_transform_update_qos ()">gst_base_transform_update_qos</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="GstBaseTransform.html#gst-base-transform-set-gap-aware" title="gst_base_transform_set_gap_aware ()">gst_base_transform_set_gap_aware</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="GstBaseTransform.html#gst-base-transform-get-allocator" title="gst_base_transform_get_allocator ()">gst_base_transform_get_allocator</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../html/GstBufferPool.html#GstBufferPool-struct"><span class="returnvalue">GstBufferPool</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBaseTransform.html#gst-base-transform-get-buffer-pool" title="gst_base_transform_get_buffer_pool ()">gst_base_transform_get_buffer_pool</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="GstBaseTransform.html#gst-base-transform-reconfigure-sink" title="gst_base_transform_reconfigure_sink ()">gst_base_transform_reconfigure_sink</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="GstBaseTransform.html#gst-base-transform-reconfigure-src" title="gst_base_transform_reconfigure_src ()">gst_base_transform_reconfigure_src</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBaseTransform.html#gst-base-transform-update-src-caps" title="gst_base_transform_update_src_caps ()">gst_base_transform_update_src_caps</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBaseTransform.html#GST-BASE-TRANSFORM-SINK-PAD:CAPS" title="GST_BASE_TRANSFORM_SINK_PAD()">GST_BASE_TRANSFORM_SINK_PAD</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBaseTransform.html#GST-BASE-TRANSFORM-SRC-PAD:CAPS" title="GST_BASE_TRANSFORM_SRC_PAD()">GST_BASE_TRANSFORM_SRC_PAD</a><span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstBaseTransform.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody><tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="GstBaseTransform.html#GstBaseTransform--qos" title="The “qos” property">qos</a></td>
<td class="property_flags">Read / Write</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstBaseTransform.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">struct</td>
<td class="function_name"><a class="link" href="GstBaseTransform.html#GstBaseTransform-struct" title="struct GstBaseTransform">GstBaseTransform</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstBaseTransform.html#GstBaseTransformClass" title="struct GstBaseTransformClass">GstBaseTransformClass</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="GstBaseTransform.html#GST-BASE-TRANSFORM-SINK-NAME:CAPS" title="GST_BASE_TRANSFORM_SINK_NAME">GST_BASE_TRANSFORM_SINK_NAME</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="GstBaseTransform.html#GST-BASE-TRANSFORM-SRC-NAME:CAPS" title="GST_BASE_TRANSFORM_SRC_NAME">GST_BASE_TRANSFORM_SRC_NAME</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="GstBaseTransform.html#GST-BASE-TRANSFORM-FLOW-DROPPED:CAPS" title="GST_BASE_TRANSFORM_FLOW_DROPPED">GST_BASE_TRANSFORM_FLOW_DROPPED</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstBaseTransform.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobjectgobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
<span class="lineart">╰──</span> <a href="../html/GstObject.html#GstObject-struct">GstObject</a>
<span class="lineart">╰──</span> <a href="../html/GstElement.html#GstElement-struct">GstElement</a>
<span class="lineart">╰──</span> GstBaseTransform
</pre>
</div>
<div class="refsect1">
<a name="GstBaseTransform.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/base/gstbasetransform.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="GstBaseTransform.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="GstBaseTransform.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-base-transform-is-passthrough"></a><h3>gst_base_transform_is_passthrough ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_base_transform_is_passthrough (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-set-passthrough"></a><h3>gst_base_transform_set_passthrough ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_base_transform_set_passthrough (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> passthrough</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-set-prefer-passthrough"></a><h3>gst_base_transform_set_prefer_passthrough ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_base_transform_set_prefer_passthrough
(<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> prefer_passthrough</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-is-in-place"></a><h3>gst_base_transform_is_in_place ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_base_transform_is_in_place (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-set-in-place"></a><h3>gst_base_transform_set_in_place ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_base_transform_set_in_place (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> in_place</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-is-qos-enabled"></a><h3>gst_base_transform_is_qos_enabled ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_base_transform_is_qos_enabled (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-set-qos-enabled"></a><h3>gst_base_transform_set_qos_enabled ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_base_transform_set_qos_enabled (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> enabled</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-update-qos"></a><h3>gst_base_transform_update_qos ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_base_transform_update_qos (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> proportion</code></em>,
<em class="parameter"><code><a href="../html/GstClock.html#GstClockTimeDiff"><span class="type">GstClockTimeDiff</span></a> diff</code></em>,
<em class="parameter"><code><a href="../html/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> timestamp</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-set-gap-aware"></a><h3>gst_base_transform_set_gap_aware ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_base_transform_set_gap_aware (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> gap_aware</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-get-allocator"></a><h3>gst_base_transform_get_allocator ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_base_transform_get_allocator (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="../html/GstAllocator.html#GstAllocator-struct"><span class="type">GstAllocator</span></a> **allocator</code></em>,
<em class="parameter"><code><a href="../html/GstAllocator.html#GstAllocationParams-struct"><span class="type">GstAllocationParams</span></a> *params</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-get-buffer-pool"></a><h3>gst_base_transform_get_buffer_pool ()</h3>
<pre class="programlisting"><a href="../html/GstBufferPool.html#GstBufferPool-struct"><span class="returnvalue">GstBufferPool</span></a> *
gst_base_transform_get_buffer_pool (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-reconfigure-sink"></a><h3>gst_base_transform_reconfigure_sink ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_base_transform_reconfigure_sink (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-reconfigure-src"></a><h3>gst_base_transform_reconfigure_src ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_base_transform_reconfigure_src (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-base-transform-update-src-caps"></a><h3>gst_base_transform_update_src_caps ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_base_transform_update_src_caps (<em class="parameter"><code><a class="link" href="GstBaseTransform.html" title="GstBaseTransform"><span class="type">GstBaseTransform</span></a> *trans</code></em>,
<em class="parameter"><code><a href="../html/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> *updated_caps</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-BASE-TRANSFORM-SINK-PAD:CAPS"></a><h3>GST_BASE_TRANSFORM_SINK_PAD()</h3>
<pre class="programlisting">#define GST_BASE_TRANSFORM_SINK_PAD(obj) (GST_BASE_TRANSFORM_CAST (obj)-&gt;sinkpad)
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-BASE-TRANSFORM-SRC-PAD:CAPS"></a><h3>GST_BASE_TRANSFORM_SRC_PAD()</h3>
<pre class="programlisting">#define GST_BASE_TRANSFORM_SRC_PAD(obj) (GST_BASE_TRANSFORM_CAST (obj)-&gt;srcpad)
</pre>
</div>
</div>
<div class="refsect1">
<a name="GstBaseTransform.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstBaseTransform-struct"></a><h3>struct GstBaseTransform</h3>
<pre class="programlisting">struct GstBaseTransform;</pre>
</div>
<hr>
<div class="refsect2">
<a name="GstBaseTransformClass"></a><h3>struct GstBaseTransformClass</h3>
<pre class="programlisting">struct GstBaseTransformClass {
GstElementClass parent_class;
gboolean passthrough_on_same_caps;
gboolean transform_ip_on_passthrough;
/* virtual methods for subclasses */
GstCaps* (*transform_caps) (GstBaseTransform *trans,
GstPadDirection direction,
GstCaps *caps, GstCaps *filter);
GstCaps* (*fixate_caps) (GstBaseTransform *trans,
GstPadDirection direction, GstCaps *caps,
GstCaps *othercaps);
gboolean (*accept_caps) (GstBaseTransform *trans, GstPadDirection direction,
GstCaps *caps);
gboolean (*set_caps) (GstBaseTransform *trans, GstCaps *incaps,
GstCaps *outcaps);
gboolean (*query) (GstBaseTransform *trans, GstPadDirection direction,
GstQuery *query);
/* decide allocation query for output buffers */
gboolean (*decide_allocation) (GstBaseTransform *trans, GstQuery *query);
gboolean (*filter_meta) (GstBaseTransform *trans, GstQuery *query,
GType api, const GstStructure *params);
/* propose allocation query parameters for input buffers */
gboolean (*propose_allocation) (GstBaseTransform *trans, GstQuery *decide_query,
GstQuery *query);
/* transform size */
gboolean (*transform_size) (GstBaseTransform *trans,
GstPadDirection direction,
GstCaps *caps, gsize size,
GstCaps *othercaps, gsize *othersize);
gboolean (*get_unit_size) (GstBaseTransform *trans, GstCaps *caps,
gsize *size);
/* states */
gboolean (*start) (GstBaseTransform *trans);
gboolean (*stop) (GstBaseTransform *trans);
/* sink and src pad event handlers */
gboolean (*sink_event) (GstBaseTransform *trans, GstEvent *event);
gboolean (*src_event) (GstBaseTransform *trans, GstEvent *event);
GstFlowReturn (*prepare_output_buffer) (GstBaseTransform * trans,
GstBuffer *input, GstBuffer **outbuf);
/* metadata */
gboolean (*copy_metadata) (GstBaseTransform *trans, GstBuffer *input,
GstBuffer *outbuf);
gboolean (*transform_meta) (GstBaseTransform *trans, GstBuffer *outbuf,
GstMeta *meta, GstBuffer *inbuf);
void (*before_transform) (GstBaseTransform *trans, GstBuffer *buffer);
/* transform */
GstFlowReturn (*transform) (GstBaseTransform *trans, GstBuffer *inbuf,
GstBuffer *outbuf);
GstFlowReturn (*transform_ip) (GstBaseTransform *trans, GstBuffer *buf);
GstFlowReturn (*submit_input_buffer) (GstBaseTransform *trans, gboolean is_discont, GstBuffer *input);
GstFlowReturn (*generate_output) (GstBaseTransform *trans, GstBuffer **outbuf);
};
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-BASE-TRANSFORM-SINK-NAME:CAPS"></a><h3>GST_BASE_TRANSFORM_SINK_NAME</h3>
<pre class="programlisting">#define GST_BASE_TRANSFORM_SINK_NAME "sink"
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-BASE-TRANSFORM-SRC-NAME:CAPS"></a><h3>GST_BASE_TRANSFORM_SRC_NAME</h3>
<pre class="programlisting">#define GST_BASE_TRANSFORM_SRC_NAME "src"
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-BASE-TRANSFORM-FLOW-DROPPED:CAPS"></a><h3>GST_BASE_TRANSFORM_FLOW_DROPPED</h3>
<pre class="programlisting">#define GST_BASE_TRANSFORM_FLOW_DROPPED GST_FLOW_CUSTOM_SUCCESS
</pre>
</div>
</div>
<div class="refsect1">
<a name="GstBaseTransform.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstBaseTransform--qos"></a><h3>The <code class="literal">“qos”</code> property</h3>
<pre class="programlisting"> “qos” <a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Handle Quality-of-Service events.</p>
<p>Flags: Read / Write</p>
<p>Default value: FALSE</p>
</div>
</div>
</div>
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