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gst/gstelement.c: Better pad activation code: Reset the collect value too on resync.

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Original commit message from CVS:
* gst/gstelement.c: (activate_pads),
(iterator_activate_fold_with_resync), (gst_element_pads_activate):
Better pad activation code: Reset the collect value too on resync.
Add some comments.
This commit is contained in:
Wim Taymans 2006-07-09 16:56:48 +00:00
parent 9d81fe82c7
commit 8b23eed267
2 changed files with 57 additions and 45 deletions
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7
ChangeLog
View file

@ -1,3 +1,10 @@
2006-07-09 Wim Taymans <wim@fluendo.com>
* gst/gstelement.c: (activate_pads),
(iterator_activate_fold_with_resync), (gst_element_pads_activate):
Better pad activation code: Reset the collect value too on resync.
Add some comments.
2006-07-09 Wim Taymans <wim@fluendo.com>
* gst/gstpad.c: (gst_pad_init), (gst_pad_activate_pull),

95
gst/gstelement.c
View file

@ -2252,8 +2252,10 @@ invalid_return:
}
}
/* gst_iterator_fold functions for pads_activate */
/* gst_iterator_fold functions for pads_activate
* Note how we don't stop the iterator when we fail an activation. This is
* probably a FIXME since when one pad activation fails, we don't want to
* continue our state change. */
static gboolean
activate_pads (GstPad * pad, GValue * ret, gboolean * active)
{
@ -2262,67 +2264,70 @@ activate_pads (GstPad * pad, GValue * ret, gboolean * active)
else if (!*active)
gst_pad_set_caps (pad, NULL);
/* unref the object that was reffed for us by _fold */
gst_object_unref (pad);
return TRUE;
}
/* returns false on error or early cutout of the fold, true otherwise */
/* returns false on error or early cutout (will never happen because the fold
* function always returns TRUE, see FIXME above) of the fold, true if all
* pads in @iter were (de)activated successfully. */
static gboolean
iterator_fold_with_resync (GstIterator * iter, GstIteratorFoldFunction func,
GValue * ret, gpointer user_data)
iterator_activate_fold_with_resync (GstIterator * iter, gpointer user_data)
{
GstIteratorResult ires;
gboolean res = TRUE;
while (1) {
ires = gst_iterator_fold (iter, func, ret, user_data);
switch (ires) {
case GST_ITERATOR_RESYNC:
gst_iterator_resync (iter);
break;
case GST_ITERATOR_DONE:
res = TRUE;
goto done;
default:
res = FALSE;
goto done;
}
}
done:
return res;
}
/* is called with STATE_LOCK
*/
static gboolean
gst_element_pads_activate (GstElement * element, gboolean active)
{
GValue ret = { 0, };
GstIterator *iter;
gboolean fold_ok;
GST_DEBUG_OBJECT (element, "pads_activate with active %d", active);
GValue ret = { 0 };
/* no need to unset this later, it's just a boolean */
g_value_init (&ret, G_TYPE_BOOLEAN);
g_value_set_boolean (&ret, TRUE);
iter = gst_element_iterate_src_pads (element);
while (1) {
ires = gst_iterator_fold (iter, (GstIteratorFoldFunction) activate_pads,
&ret, user_data);
switch (ires) {
case GST_ITERATOR_RESYNC:
/* need to reset the result again */
g_value_set_boolean (&ret, TRUE);
gst_iterator_resync (iter);
break;
case GST_ITERATOR_DONE:
/* all pads iterated, return collected value */
goto done;
default:
/* iterator returned _ERROR or premature end with _OK,
* mark an error and exit */
g_value_set_boolean (&ret, FALSE);
goto done;
}
}
done:
/* return collected value */
return g_value_get_boolean (&ret);
}
fold_ok = iterator_fold_with_resync
(iter, (GstIteratorFoldFunction) activate_pads, &ret, &active);
/* is called with STATE_LOCK
*
* Pads are activated from source pads to sinkpads.
*/
static gboolean
gst_element_pads_activate (GstElement * element, gboolean active)
{
GstIterator *iter;
gboolean res;
GST_DEBUG_OBJECT (element, "pads_activate with active %d", active);
iter = gst_element_iterate_src_pads (element);
res = iterator_activate_fold_with_resync (iter, &active);
gst_iterator_free (iter);
if (G_UNLIKELY (!fold_ok || !g_value_get_boolean (&ret)))
if (G_UNLIKELY (!res))
goto src_failed;
iter = gst_element_iterate_sink_pads (element);
fold_ok = iterator_fold_with_resync
(iter, (GstIteratorFoldFunction) activate_pads, &ret, &active);
res = iterator_activate_fold_with_resync (iter, &active);
gst_iterator_free (iter);
if (G_UNLIKELY (!fold_ok || !g_value_get_boolean (&ret)))
if (G_UNLIKELY (!res))
goto sink_failed;
GST_DEBUG_OBJECT (element, "pads_activate successful");