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<a href="#gst-plugins-base-libs-gstcolorbalance.synopsis" class="shortcut">Top</a>
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<a href="#gst-plugins-base-libs-gstcolorbalance.description" class="shortcut">Description</a>
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<a href="#gst-plugins-base-libs-gstcolorbalance.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<a href="#gst-plugins-base-libs-gstcolorbalance.signals" class="shortcut">Signals</a>
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<div class="refentry">
<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 valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstcolorbalance.synopsis"></a><h2>Synopsis</h2>
<a name="GstColorBalance"></a><pre class="synopsis">
#include <gst/video/colorbalance.h>
<a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance-struct" title="GstColorBalance">GstColorBalance</a>;
struct <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalanceInterface" title="struct GstColorBalanceInterface">GstColorBalanceInterface</a>;
enum <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalanceType" title="enum GstColorBalanceType">GstColorBalanceType</a>;
const <a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> * <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> (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> *balance</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <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> (<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>);
<span class="returnvalue">void</span> <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> (<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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> value</code></em>);
<span class="returnvalue">void</span> <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> (<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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> value</code></em>);
<a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalanceType" title="enum GstColorBalanceType"><span class="returnvalue">GstColorBalanceType</span></a> <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> (<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>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
GInterface
+----GstColorBalance
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.signals"></a><h2>Signals</h2>
<pre class="synopsis">
"<a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance-value-changed" title='The "value-changed" signal'>value-changed</a>" : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a>
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.description"></a><h2>Description</h2>
<p>
</p>
<div class="refsect2">
<a name="idp80218080"></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>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstcolorbalance.details"></a><h2>Details</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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GTypeInterface"><span class="type">GTypeInterface</span></a> <em class="structfield"><code><a name="GstColorBalanceInterface.iface"></a>iface</code></em>;</span></p></td>
<td>the parent interface</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstColorBalanceInterface.list-channels"></a>list_channels</code></em> ()</span></p></td>
<td>list handled channels</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstColorBalanceInterface.set-value"></a>set_value</code></em> ()</span></p></td>
<td>set a channel value</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstColorBalanceInterface.get-value"></a>get_value</code></em> ()</span></p></td>
<td>get a channel value</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstColorBalanceInterface.get-balance-type"></a>get_balance_type</code></em> ()</span></p></td>
<td></td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstColorBalanceInterface.value-changed"></a>value_changed</code></em> ()</span></p></td>
<td>default handler for value changed notification</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstColorBalanceType"></a><h3>enum GstColorBalanceType</h3>
<pre class="programlisting">typedef enum {
GST_COLOR_BALANCE_HARDWARE,
GST_COLOR_BALANCE_SOFTWARE
} GstColorBalanceType;
</pre>
<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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-COLOR-BALANCE-HARDWARE:CAPS"></a><span class="term"><code class="literal">GST_COLOR_BALANCE_HARDWARE</code></span></p></td>
<td>Color balance is implemented with dedicated
hardware.
</td>
</tr>
<tr>
<td><p><a name="GST-COLOR-BALANCE-SOFTWARE:CAPS"></a><span class="term"><code class="literal">GST_COLOR_BALANCE_SOFTWARE</code></span></p></td>
<td>Color balance is implemented via software
processing.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-color-balance-list-channels"></a><h3>gst_color_balance_list_channels ()</h3>
<pre class="programlisting">const <a href="http://library.gnome.org/devel/glib/unstable/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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>balance</code></em> :</span></p></td>
<td>A <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> instance</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>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.</td>
</tr>
</tbody>
</table></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="http://library.gnome.org/devel/glib/unstable/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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>balance</code></em> :</span></p></td>
<td>A <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> instance</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>channel</code></em> :</span></p></td>
<td>A <a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> instance</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The current value of the channel.</td>
</tr>
</tbody>
</table></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="http://library.gnome.org/devel/glib/unstable/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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>balance</code></em> :</span></p></td>
<td>A <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> instance</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>channel</code></em> :</span></p></td>
<td>A <a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> instance</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>The new value for the channel.</td>
</tr>
</tbody>
</table></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="http://library.gnome.org/devel/glib/unstable/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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>balance</code></em> :</span></p></td>
<td>A <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> instance</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>channel</code></em> :</span></p></td>
<td>A <a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a> whose value has changed</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>The new value of the channel</td>
</tr>
</tbody>
</table></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>
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<td><p><span class="term"><em class="parameter"><code>balance</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalance"><span class="type">GstColorBalance</span></a> implementation</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A the <a class="link" href="gst-plugins-base-libs-gstcolorbalance.html#GstColorBalanceType" title="enum GstColorBalanceType"><span class="type">GstColorBalanceType</span></a>.</td>
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<a name="gst-plugins-base-libs-gstcolorbalance.signal-details"></a><h2>Signal Details</h2>
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<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="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> value,
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data) : <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">Run Last</code></a></pre>
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Fired when the value of the indicated channel has changed.
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<td><p><span class="term"><em class="parameter"><code>colorbalance</code></em> :</span></p></td>
<td>The GstColorBalance instance</td>
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<td><p><span class="term"><em class="parameter"><code>channel</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstcolorbalancechannel.html#GstColorBalanceChannel"><span class="type">GstColorBalanceChannel</span></a>
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<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>The new value</td>
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<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
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