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gst/gstutils.c (gst_element_link_pads): Instead of calling gst_pad_link, call pad_link_maybe_ghosting,
Original commit message from CVS: 2005-05-13 Andy Wingo <wingo@pobox.com> * gst/gstutils.c (gst_element_link_pads): Instead of calling gst_pad_link, call pad_link_maybe_ghosting, (pad_link_maybe_ghosting): Links pads, making sure that the elements being linked are in the same bin. (find_common_root, object_has_ancestor, ghost_up, remove_pad): Helpers for pad_link_maybe_ghosting.
This commit is contained in:
Andy Wingo
parent
8eb7e12669
commit
79d4977020
2 changed files with 185 additions and 4 deletions
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@ -1,3 +1,12 @@
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2005-05-13 Andy Wingo <wingo@pobox.com>
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* gst/gstutils.c (gst_element_link_pads): Instead of calling
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gst_pad_link, call pad_link_maybe_ghosting,
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(pad_link_maybe_ghosting): Links pads, making sure that the
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elements being linked are in the same bin.
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(find_common_root, object_has_ancestor, ghost_up, remove_pad):
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Helpers for pad_link_maybe_ghosting.
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2005-05-13 Tim-Philipp Müller <tim at centricular dot net>
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* configure.ac:
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180
gst/gstutils.c
180
gst/gstutils.c
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@ -736,6 +736,178 @@ gst_element_state_get_name (GstElementState state)
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return "";
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}
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/* if return val is true, *direct_child is a caller-owned ref on the direct
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* child of ancestor that is part of object's ancestry */
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static gboolean
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object_has_ancestor (GstObject * object, GstObject * ancestor,
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GstObject ** direct_child)
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{
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GstObject *child, *parent;
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if (direct_child)
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*direct_child = NULL;
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child = gst_object_ref (object);
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parent = gst_object_get_parent (object);
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while (parent) {
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if (ancestor == parent) {
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if (direct_child)
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*direct_child = child;
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else
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gst_object_unref (child);
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gst_object_unref (parent);
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return TRUE;
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}
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gst_object_unref (child);
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child = parent;
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parent = gst_object_get_parent (parent);
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}
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gst_object_unref (child);
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return FALSE;
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}
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/* caller owns return */
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static GstObject *
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find_common_root (GstObject * o1, GstObject * o2)
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{
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GstObject *top = o1;
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GstObject *kid1, *kid2;
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GstObject *root = NULL;
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while (GST_OBJECT_PARENT (top))
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top = GST_OBJECT_PARENT (top);
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/* the itsy-bitsy spider... */
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if (!object_has_ancestor (o2, top, &kid2))
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return NULL;
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root = gst_object_ref (top);
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while (TRUE) {
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if (!object_has_ancestor (o1, kid2, &kid1)) {
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gst_object_unref (kid2);
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return root;
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}
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root = kid2;
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if (!object_has_ancestor (o2, kid1, &kid2)) {
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gst_object_unref (kid1);
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return root;
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}
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root = kid1;
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}
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}
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/* caller does not own return */
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static GstPad *
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ghost_up (GstElement * e, GstPad * pad)
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{
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static gint ghost_pad_index = 0;
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GstPad *gpad;
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gchar *name;
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name = g_strdup_printf ("ghost%d", ghost_pad_index++);
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gpad = gst_ghost_pad_new (name, pad);
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g_free (name);
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if (!gst_element_add_pad ((GstElement *) GST_OBJECT_PARENT (e), gpad)) {
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g_warning ("Pad named %s already exists in element %s\n",
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GST_OBJECT_NAME (gpad), GST_OBJECT_NAME (GST_OBJECT_PARENT (e)));
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gst_object_unref ((GstObject *) gpad);
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return NULL;
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}
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return gpad;
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}
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static void
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remove_pad (gpointer ppad, gpointer unused)
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{
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GstPad *pad = ppad;
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if (!gst_element_remove_pad ((GstElement *) GST_OBJECT_PARENT (pad), pad))
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g_warning ("Couldn't remove pad %s from element %s",
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GST_OBJECT_NAME (pad), GST_OBJECT_NAME (GST_OBJECT_PARENT (pad)));
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}
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static gboolean
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prepare_link_maybe_ghosting (GstPad ** src, GstPad ** sink,
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GSList ** pads_created)
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{
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GstObject *root;
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GstObject *e1, *e2;
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GSList *pads_created_local = NULL;
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g_assert (pads_created);
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e1 = GST_OBJECT_PARENT (*src);
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e2 = GST_OBJECT_PARENT (*sink);
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if (GST_OBJECT_PARENT (e1) == GST_OBJECT_PARENT (e2)) {
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GST_CAT_INFO (GST_CAT_PADS, "%s and %s in same bin, no need for ghost pads",
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GST_OBJECT_NAME (e1), GST_OBJECT_NAME (e2));
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return TRUE;
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}
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GST_CAT_INFO (GST_CAT_PADS, "%s and %s not in same bin, making ghost pads",
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GST_OBJECT_NAME (e1), GST_OBJECT_NAME (e2));
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/* we need to setup some ghost pads */
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root = find_common_root (e1, e2);
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if (!root) {
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g_warning
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("Trying to connect elements that don't share a common ancestor: %s and %s\n",
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GST_ELEMENT_NAME (e1), GST_ELEMENT_NAME (e2));
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return FALSE;
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}
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while (GST_OBJECT_PARENT (e1) != root) {
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*src = ghost_up ((GstElement *) e1, *src);
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if (!*src)
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goto cleanup_fail;
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e1 = GST_OBJECT_PARENT (*src);
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pads_created_local = g_slist_prepend (pads_created_local, *src);
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}
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while (GST_OBJECT_PARENT (e2) != root) {
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*sink = ghost_up ((GstElement *) e2, *sink);
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if (!*sink)
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goto cleanup_fail;
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e2 = GST_OBJECT_PARENT (*sink);
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pads_created_local = g_slist_prepend (pads_created_local, *sink);
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}
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*pads_created = g_slist_concat (*pads_created, pads_created_local);
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return TRUE;
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cleanup_fail:
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g_slist_foreach (pads_created_local, remove_pad, NULL);
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g_slist_free (pads_created_local);
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return FALSE;
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}
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static gboolean
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pad_link_maybe_ghosting (GstPad * src, GstPad * sink)
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{
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GSList *pads_created = NULL;
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gboolean ret;
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if (!prepare_link_maybe_ghosting (&src, &sink, &pads_created)) {
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ret = FALSE;
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} else {
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ret = (gst_pad_link (src, sink) == GST_PAD_LINK_OK);
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}
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if (!ret) {
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g_slist_foreach (pads_created, remove_pad, NULL);
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}
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g_slist_free (pads_created);
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return ret;
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}
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/**
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* gst_element_link_pads:
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* @src: a #GstElement containing the source pad.
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@ -835,7 +1007,7 @@ gst_element_link_pads (GstElement * src, const gchar * srcpadname,
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gboolean result;
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/* two explicitly specified pads */
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result = gst_pad_link (srcpad, destpad);
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result = pad_link_maybe_ghosting (srcpad, destpad);
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gst_object_unref (GST_OBJECT (srcpad));
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gst_object_unref (GST_OBJECT (destpad));
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@ -862,7 +1034,7 @@ gst_element_link_pads (GstElement * src, const gchar * srcpadname,
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gst_object_ref (GST_OBJECT (temp));
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}
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if (temp && gst_pad_link (srcpad, temp) == GST_PAD_LINK_OK) {
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if (temp && pad_link_maybe_ghosting (srcpad, temp)) {
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GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "linked pad %s:%s to pad %s:%s",
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GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (temp));
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if (destpad)
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@ -904,7 +1076,7 @@ gst_element_link_pads (GstElement * src, const gchar * srcpadname,
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(GST_PAD_PEER (destpad) == NULL)) {
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GstPad *temp = gst_element_get_compatible_pad (src, destpad, NULL);
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if (temp && gst_pad_link (temp, destpad) == GST_PAD_LINK_OK) {
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if (temp && pad_link_maybe_ghosting (temp, destpad)) {
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GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "linked pad %s:%s to pad %s:%s",
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GST_DEBUG_PAD_NAME (temp), GST_DEBUG_PAD_NAME (destpad));
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gst_object_unref (GST_OBJECT (temp));
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@ -958,7 +1130,7 @@ gst_element_link_pads (GstElement * src, const gchar * srcpadname,
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gst_element_get_request_pad (src, srctempl->name_template);
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destpad =
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gst_element_get_request_pad (dest, desttempl->name_template);
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if (gst_pad_link (srcpad, destpad) == GST_PAD_LINK_OK) {
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if (pad_link_maybe_ghosting (srcpad, destpad)) {
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GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
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"linked pad %s:%s to pad %s:%s",
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GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
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