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manual: update controller documentation

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This commit is contained in:
Mark Nauwelaerts 2012-09-21 21:13:27 +02:00
parent a722212dc9
commit 77e74583fd
1 changed files with 6 additions and 15 deletions
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21
docs/manual/advanced-dparams.xml
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@ -44,27 +44,18 @@
<sect1 id="section-dparams-parameters">
<title>Setting up parameter control</title>
<para>
The first step is to select the parameters that should be controlled.
This returns a controller object that is needed to further adjust the
behaviour.
</para>
<programlisting>
controller = gst_object_control_properties(object, "prop1", "prop2",...);
</programlisting>
<para>
Next we attach a control-source to each parameter. Lets use an
interpolation control-source:
Create a control-source. Lets use an interpolation control-source:
</para>
<programlisting>
csource = gst_interpolation_control_source_new ();
gst_interpolation_control_source_set_interpolation_mode(csource, GST_INTERPOLATE_LINEAR);
g_object_set (csource, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL);
</programlisting>
<para>
Now we need to assign the control-source to the gobject property. One
Now we need to assign the control-source to the gobject property. One
control source can only be assigned to one property.
</para>
<programlisting>
gst_controller_set_control_source (controller, "prop1", csource);
gst_object_add_control_binding (object, gst_direct_control_binding_new (object, "prop1", csource));
</programlisting>
<para>
This control-source takes new property values from a list of time-stamped
@ -80,8 +71,8 @@
different functions to specify the control-changes over time.
</para>
<programlisting>
gst_interpolation_control_source_set (csource, 0 * GST_SECOND, value1);
gst_interpolation_control_source_set (csource, 1 * GST_SECOND, value2);
gst_timed_value_control_source_set ((GstTimedValueControlSource *)csource,0 * GST_SECOND, value1);
gst_timed_value_control_source_set ((GstTimedValueControlSource *)csource,1 * GST_SECOND, value2);
</programlisting>
<para>
Now everything is ready to play. One final note - the controller subsystem