2005-12-11 Tim-Philipp Müller <tim at centricular dot net>
+ * docs/pwg/building-chainfn.xml:
+ * docs/pwg/building-pads.xml:
+ * docs/pwg/building-state.xml:
+ * docs/pwg/other-source.xml:
+ Update state change stuff for 0.10 (fixes #322969).
+
+2005-12-11 Tim-Philipp Müller <tim at centricular dot net>
+
* docs/manual/advanced-dataaccess.xml:
* docs/manual/appendix-checklist.xml:
* docs/manual/appendix-programs.xml:
}
<!-- example-end chain.c b -->
<!-- example-begin chain.c c --><!--
-static GstElementStateReturn
-gst_my_filter_change_state (GstElement * element)
+static GstStateChangeReturn
+gst_my_filter_change_state (GstElement * element, GstStateChange transition)
{
return GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS,
- change_state, (element), GST_STATE_SUCCESS);
+ change_state, (element, transition), GST_STATE_CHANGE_SUCCESS);
}
#include "register.func"
--><!-- example-end chain.c c --></programlisting>
}
<!-- example-end chain.func b -->
<!-- example-begin chain2.c b --><!--
-static GstElementStateReturn
-gst_my_filter_change_state (GstElement * element)
+static GstStateChangeReturn
+gst_my_filter_change_state (GstElement * element, GstStateChange transition)
{
return GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS,
- change_state, (element), GST_STATE_SUCCESS);
+ change_state, (element, transition), GST_STATE_CHANGE_SUCCESS);
}
#include "register.func"
--><!-- example-end chain2.c b --></programlisting>
#include "filter.h"
#include <string.h>
-static GstElementStateReturn
- gst_my_filter_change_state (GstElement * element);
+static GstStateChangeReturn
+gst_my_filter_change_state (GstElement * element, GstStateChange transition);
GST_BOILERPLATE (GstMyFilter, gst_my_filter, GstElement, GST_TYPE_ELEMENT);
return gst_pad_push (GST_MY_FILTER (GST_OBJECT_PARENT (pad))->srcpad, buf);
}
-static GstElementStateReturn
-gst_my_filter_change_state (GstElement * element)
+static GstStateChangeReturn
+gst_my_filter_change_state (GstElement * element, GstStateChange transition)
{
return GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS,
- change_state, (element), GST_STATE_SUCCESS);
+ change_state, (element, transition), GST_STATE_CHANGE_SUCCESS);
}
#include "register.func"
static GstStateChangeReturn
gst_my_filter_change_state (GstElement *element, GstStateChange transition)
{
- GstElementStateReturn ret = GST_STATE_SUCCESS;
+ GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstMyFilter *filter = GST_MY_FILTER (element);
switch (transition) {
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+ if (ret == GST_STATE_CHANGE_FAILURE)
+ return ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
#include "register.func"
--><!-- example-end state.c b --></programlisting>
<para>
- Note that upwards (NULL=>READY, READY=>PAUSED, PAUSED=>PLAYING) and
- downwards (PLAYING=>PAUSED, PAUSED=>READY, READY=>NULL) state changes
- are handled in two separate blocks with the downwards state change
+ Note that upwards (NULL=>READY, READY=>PAUSED, PAUSED=>PLAYING)
+ and downwards (PLAYING=>PAUSED, PAUSED=>READY, READY=>NULL) state
+ changes are handled in two separate blocks with the downwards state change
handled only after we have chained up to the parent class's state
change function. This is necessary in order to safely handle concurrent
access by multiple threads.
return GST_DATA (buf);
}
-static GstStateReturn
-gst_my_source_change_state (GstElement *element)
+static GstStateChangeReturn
+gst_my_source_change_state (GstElement *element, GstStateChange transition)
{
+ GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstMySource *src = GST_MY_SOURCE (element);
- switch (GST_STATE_PENDING (element)) {
- case GT_STATE_PAUSED_TO_READY:
- src->total_bytes = 0;
+ /* First, handle upwards state changes */
+ switch (transition) {
+ case GST_STATE_READY_TO_PAUSED:
+ /* do something */
break;
-
default:
break;
}
- if (GST_ELEMENT_CLASS (parent_class)->change_state)
- return GST_ELEMENT_CLASS (parent_class)->change_state (element);
+ ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+ if (ret == GST_STATE_CHANGE_FAILURE)
+ return ret;
+
+ /* Now handle downwards state changes after chaining up */
+ switch (transition) {
+ case GST_STATE_PAUSED_TO_READY:
+ src->total_bytes = 0;
+ break;
+ default:
+ break;
+ }
- return GST_STATE_SUCCESS;
+ return ret;
}
</programlisting>
<para>