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gst/gstbin.c (gst_bin_foreach): New static function. Calls a procedure on the children of a bin. Assumes that the pro...

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Original commit message from CVS:
2004-07-11  Andy Wingo  <wingo@pobox.com>

* gst/gstbin.c (gst_bin_foreach): New static function. Calls a
procedure on the children of a bin. Assumes that the procedure can
change the set of children.
(set_kid_state_func): New static function.
(gst_bin_change_state): Use gst_bin_foreach to call
set_kid_state_func. Fixes a bug: if a child had a state-change
handler that removes it from the bin, there would be a segfault.
Hopefully it should also work in the case where the state-change
handler on one child adds or removes other children. In any case,
fixes should go to gst_bin_foreach.
This commit is contained in:
Andy Wingo 2004-07-11 11:11:37 +00:00
parent 0ce552665c
commit 799ee9420c
2 changed files with 113 additions and 65 deletions
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15
ChangeLog
View file

@ -1,3 +1,16 @@
2004-07-11 Andy Wingo <wingo@pobox.com>
* gst/gstbin.c (gst_bin_foreach): New static function. Calls a
procedure on the children of a bin. Assumes that the procedure can
change the set of children.
(set_kid_state_func): New static function.
(gst_bin_change_state): Use gst_bin_foreach to call
set_kid_state_func. Fixes a bug: if a child had a state-change
handler that removes it from the bin, there would be a segfault.
Hopefully it should also work in the case where the state-change
handler on one child adds or removes other children. In any case,
fixes should go to gst_bin_foreach.
2004-07-10 Thomas Vander Stichele <thomas at apestaart dot org>
* gst/gstelement.c: (gst_element_set_state):
@ -652,6 +665,7 @@
* autogen.sh: Add a temporary 'env' to test buildbot problems.
>>>>>>> 1.652
2004-06-04 Thomas Vander Stichele <thomas (at) apestaart (dot) org>
* configure.ac:
@ -1923,6 +1937,7 @@
add .po file download snippet
fix a bug in the doc makefile
>>>>>>> 1.566
2004-04-20 Thomas Vander Stichele <thomas at apestaart dot org>
* Makefile.am:

163
gst/gstbin.c
View file

@ -701,15 +701,102 @@ gst_bin_child_state_change_func (GstBin * bin, GstElementState oldstate,
GST_UNLOCK (bin);
}
typedef gint (*GstBinForeachFunc) (GstBin * bin, GstElement * element,
gpointer data);
/* Call FUNC on each child of BIN, in the order that they are in bin->children.
It is assumed that calling FUNC may alter the set of BIN's children. FUNC
will only be called on children that were in BIN when the gst_bin_foreach was
called, and that are still in BIN when the child is reached.
The return value semantics are a bit odd in this one:
If FUNC returns a nonnegative number, the number is added on to the eventual
return value of gst_bin_foreach, which starts at 0.
If any FUNC returns a negative number, that value is immediately returned to
the caller. In that case, the child list might only be partially traversed.
*/
static gint
gst_bin_foreach (GstBin * bin, GstBinForeachFunc func, gpointer data)
{
gint sum = 0;
GList *kids = g_list_copy (bin->children);
while (kids) {
GstElement *element = (GstElement *) kids->data;
gint res = 0;
if (g_list_find (bin->children, element))
res = func (bin, element, data);
if (res < 0)
return res;
sum += res;
kids = kids->next;
}
g_list_free (kids);
return sum;
}
static int
set_kid_state_func (GstBin * bin, GstElement * child, gpointer data)
{
GstElementState old_child_state, pending;
pending = (GstElementState) (GPOINTER_TO_INT (data));
if (GST_FLAG_IS_SET (child, GST_ELEMENT_LOCKED_STATE)) {
return 0;
}
old_child_state = GST_STATE (child);
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, bin,
"changing state of child %s from current %s to pending %s",
GST_ELEMENT_NAME (child), gst_element_state_get_name (old_child_state),
gst_element_state_get_name (pending));
switch (gst_element_set_state (child, pending)) {
case GST_STATE_FAILURE:
GST_CAT_INFO_OBJECT (GST_CAT_STATES, bin,
"child '%s' failed to go to state %d(%s)",
GST_ELEMENT_NAME (child),
pending, gst_element_state_get_name (pending));
gst_element_set_state (child, old_child_state);
return -1; /* error out to the caller */
case GST_STATE_ASYNC:
GST_CAT_INFO_OBJECT (GST_CAT_STATES, bin,
"child '%s' is changing state asynchronously",
GST_ELEMENT_NAME (child));
return 1;
case GST_STATE_SUCCESS:
GST_CAT_DEBUG (GST_CAT_STATES,
"child '%s' changed state to %d(%s) successfully",
GST_ELEMENT_NAME (child), pending,
gst_element_state_get_name (pending));
return 0;
default:
g_assert_not_reached ();
return -1; /* satisfy gcc */
}
}
static GstElementStateReturn
gst_bin_change_state (GstElement * element)
{
GstBin *bin;
GList *children;
GstElement *child;
GstElementStateReturn ret;
GstElementState old_state, pending;
gint transition;
gint transition, kid_return;
gboolean have_async = FALSE;
g_return_val_if_fail (GST_IS_BIN (element), GST_STATE_FAILURE);
@ -728,69 +815,15 @@ gst_bin_change_state (GstElement * element)
if (pending == GST_STATE_VOID_PENDING)
return GST_STATE_SUCCESS;
/* we want to recurse into children anyway, regardless of our old
* state */
/*
if (old_state == pending) {
GST_CAT_LOG_OBJECT (GST_CAT_STATES, element,
"old and pending state are both %s, returning",
gst_element_state_get_name (pending));
return GST_STATE_SUCCESS;
}
*/
kid_return = gst_bin_foreach (bin, set_kid_state_func,
GINT_TO_POINTER ((int) pending));
children = bin->children;
while (children) {
GstElementState old_child_state;
child = GST_ELEMENT (children->data);
if (GST_FLAG_IS_SET (child, GST_ELEMENT_LOCKED_STATE)) {
children = g_list_next (children);
continue;
}
old_child_state = GST_STATE (child);
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,
"changing state of child %s from current %s to pending %s",
GST_ELEMENT_NAME (child), gst_element_state_get_name (old_child_state),
gst_element_state_get_name (pending));
switch (gst_element_set_state (child, pending)) {
case GST_STATE_FAILURE:
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
"child '%s' failed to go to state %d(%s)",
GST_ELEMENT_NAME (child),
pending, gst_element_state_get_name (pending));
gst_element_set_state (child, old_child_state);
/* There was a check for elements being in the same scheduling group
here. Removed by dolphy <julien@moutte.net>. No matter the
scheduling group we should always return a failure. This change
seems to work on my machine and fixes tons of issues. If anyone
want to revert please tell me what it breaks first, Thanks. */
GST_STATE_PENDING (element) = old_state;
return GST_STATE_FAILURE;
break;
case GST_STATE_ASYNC:
GST_CAT_INFO_OBJECT (GST_CAT_STATES, element,
"child '%s' is changing state asynchronously",
GST_ELEMENT_NAME (child));
have_async = TRUE;
break;
case GST_STATE_SUCCESS:
GST_CAT_DEBUG (GST_CAT_STATES,
"child '%s' changed state to %d(%s) successfully",
GST_ELEMENT_NAME (child), pending,
gst_element_state_get_name (pending));
break;
}
/* we need to do this down here, because there might be elements removed
* from this bin during state changes, so g_list_next (children) might
* change as well */
children = g_list_next (children);
/* see gst_bin_foreach return value semantics above */
if (kid_return < 0) {
GST_STATE_PENDING (element) = old_state;
return GST_STATE_FAILURE;
} else if (kid_return > 0) {
have_async = TRUE;
}
GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, element,