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<a name="gst-plugins-base-libs-gstcolorbalance"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstcolorbalance.top_of_page"></a>gstcolorbalance</span></h2>
<p>gstcolorbalance — Interface for adjusting color balance settings</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">const <a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#gst-color-balance-list-channels" title="gst_color_balance_list_channels ()">gst_color_balance_list_channels</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#gst-color-balance-get-value" title="gst_color_balance_get_value ()">gst_color_balance_get_value</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="gst-plugins-base-libs-gstcolorbalance.html#gst-color-balance-set-value" title="gst_color_balance_set_value ()">gst_color_balance_set_value</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="gst-plugins-base-libs-gstcolorbalance.html#gst-color-balance-value-changed" title="gst_color_balance_value_changed ()">gst_color_balance_value_changed</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalanceType" title="enum GstColorBalanceType"><span class="returnvalue">GstColorBalanceType</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#gst-color-balance-get-balance-type" title="gst_color_balance_get_balance_type ()">gst_color_balance_get_balance_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.signals"></a><h2>Signals</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="signals_return">
<col width="300px" class="signals_name">
<col width="200px" class="signals_flags">
</colgroup>
<tbody><tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance-value-changed" title="The “value-changed” signal">value-changed</a></td>
<td class="signal_flags">Run Last</td>
</tr></tbody>
</table></div>
</div>
<a name="GstColorBalance"></a><div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance-struct" title="GstColorBalance">GstColorBalance</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalanceInterface" title="struct GstColorBalanceInterface">GstColorBalanceInterface</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalanceType" title="enum GstColorBalanceType">GstColorBalanceType</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> GInterface
<span class="lineart">╰──</span> GstColorBalance
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <gst/video/colorbalance.h>
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.description"></a><h2>Description</h2>
<div class="refsect2">
<a name="id-1.2.14.8.9.2"></a><p>
This interface is implemented by elements which can perform some color
balance operation on video frames they process. For example, modifying
the brightness, contrast, hue or saturation.
</p>
<p>
Example elements are 'xvimagesink' and 'colorbalance'
</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-color-balance-list-channels"></a><h3>gst_color_balance_list_channels ()</h3>
<pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
gst_color_balance_list_channels (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> *balance</code></em>);</pre>
<p>Retrieve a list of the available channels.</p>
<div class="refsect3">
<a name="id-1.2.14.8.10.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>balance</p></td>
<td class="parameter_description"><p>A <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.14.8.10.2.6"></a><h4>Returns</h4>
<p> A GList containing pointers to <a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> objects.
The list is owned by the <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> instance and must not
be freed.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-color-balance-get-value"></a><h3>gst_color_balance_get_value ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
gst_color_balance_get_value (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> *balance</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> *channel</code></em>);</pre>
<p>Retrieve the current value of the indicated channel, between min_value
and max_value.</p>
<p>See Also: The <span class="type">GstColorBalanceChannel.min_value</span> and
<span class="type">GstColorBalanceChannel.max_value</span> members of the
<a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> object.</p>
<div class="refsect3">
<a name="id-1.2.14.8.10.3.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>balance</p></td>
<td class="parameter_description"><p>A <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>channel</p></td>
<td class="parameter_description"><p>A <a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.14.8.10.3.7"></a><h4>Returns</h4>
<p> The current value of the channel.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-color-balance-set-value"></a><h3>gst_color_balance_set_value ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_color_balance_set_value (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> *balance</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> *channel</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> value</code></em>);</pre>
<p>Sets the current value of the channel to the passed value, which must
be between min_value and max_value.</p>
<p>See Also: The <span class="type">GstColorBalanceChannel.min_value</span> and
<span class="type">GstColorBalanceChannel.max_value</span> members of the
<a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> object.</p>
<div class="refsect3">
<a name="id-1.2.14.8.10.4.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>balance</p></td>
<td class="parameter_description"><p>A <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>channel</p></td>
<td class="parameter_description"><p>A <a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>The new value for the channel.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-color-balance-value-changed"></a><h3>gst_color_balance_value_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_color_balance_value_changed (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> *balance</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> *channel</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> value</code></em>);</pre>
<p>A helper function called by implementations of the GstColorBalance
interface. It fires the <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance-value-changed" title="The “value-changed” signal"><span class="type">“value-changed”</span></a> signal on the
instance, and the <a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel-value-changed" title="The “value-changed” signal"><span class="type">“value-changed”</span></a> signal on the
channel object.</p>
<div class="refsect3">
<a name="id-1.2.14.8.10.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>balance</p></td>
<td class="parameter_description"><p>A <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>channel</p></td>
<td class="parameter_description"><p>A <a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> whose value has changed</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>The new value of the channel</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-color-balance-get-balance-type"></a><h3>gst_color_balance_get_balance_type ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalanceType" title="enum GstColorBalanceType"><span class="returnvalue">GstColorBalanceType</span></a>
gst_color_balance_get_balance_type (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> *balance</code></em>);</pre>
<p>Get the <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalanceType" title="enum GstColorBalanceType"><span class="type">GstColorBalanceType</span></a> of this implementation.</p>
<div class="refsect3">
<a name="id-1.2.14.8.10.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>balance</p></td>
<td class="parameter_description"><p>The <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> implementation</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.14.8.10.6.6"></a><h4>Returns</h4>
<p> A the <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalanceType" title="enum GstColorBalanceType"><span class="type">GstColorBalanceType</span></a>.</p>
<p></p>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstColorBalance-struct"></a><h3>GstColorBalance</h3>
<pre class="programlisting">typedef struct _GstColorBalance GstColorBalance;</pre>
</div>
<hr>
<div class="refsect2">
<a name="GstColorBalanceInterface"></a><h3>struct GstColorBalanceInterface</h3>
<pre class="programlisting">struct GstColorBalanceInterface {
GTypeInterface iface;
/* virtual functions */
const GList * (* list_channels) (GstColorBalance *balance);
void (* set_value) (GstColorBalance *balance,
GstColorBalanceChannel *channel,
gint value);
gint (* get_value) (GstColorBalance *balance,
GstColorBalanceChannel *channel);
GstColorBalanceType (*get_balance_type) (GstColorBalance *balance);
/* signals */
void (* value_changed) (GstColorBalance *balance,
GstColorBalanceChannel *channel,
gint value);
};
</pre>
<p>Color-balance interface.</p>
<div class="refsect3">
<a name="id-1.2.14.8.11.3.5"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/gobject/gobject-Type-Information.html#GTypeInterface"><span class="type">GTypeInterface</span></a> <em class="structfield"><code><a name="GstColorBalanceInterface.iface"></a>iface</code></em>;</p></td>
<td class="struct_member_description"><p>the parent interface</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstColorBalanceInterface.list-channels"></a>list_channels</code></em> ()</p></td>
<td class="struct_member_description"><p>list handled channels</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstColorBalanceInterface.set-value"></a>set_value</code></em> ()</p></td>
<td class="struct_member_description"><p>set a channel value</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstColorBalanceInterface.get-value"></a>get_value</code></em> ()</p></td>
<td class="struct_member_description"><p>get a channel value</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstColorBalanceInterface.get-balance-type"></a>get_balance_type</code></em> ()</p></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstColorBalanceInterface.value-changed"></a>value_changed</code></em> ()</p></td>
<td class="struct_member_description"><p>default handler for value changed notification</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstColorBalanceType"></a><h3>enum GstColorBalanceType</h3>
<p>An enumeration indicating whether an element implements color balancing
operations in software or in dedicated hardware. In general, dedicated
hardware implementations (such as those provided by xvimagesink) are
preferred.</p>
<div class="refsect3">
<a name="id-1.2.14.8.11.4.4"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GST-COLOR-BALANCE-HARDWARE:CAPS"></a>GST_COLOR_BALANCE_HARDWARE</p></td>
<td class="enum_member_description">
<p>Color balance is implemented with dedicated
hardware.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-COLOR-BALANCE-SOFTWARE:CAPS"></a>GST_COLOR_BALANCE_SOFTWARE</p></td>
<td class="enum_member_description">
<p>Color balance is implemented via software
processing.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="GstColorBalance-value-changed"></a><h3>The <code class="literal">“value-changed”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> *colorbalance,
<a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> *channel,
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> value,
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data)</pre>
<p>Fired when the value of the indicated channel has changed.</p>
<div class="refsect3">
<a name="id-1.2.14.8.12.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>colorbalance</p></td>
<td class="parameter_description"><p>The GstColorBalance instance</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>channel</p></td>
<td class="parameter_description"><p>The <a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>The new value</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: Run Last</p>
</div>
</div>
</div>
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