return FALSE;
}
+static gboolean
+gst_parse_element_can_do_caps (GstElement * e, GstPadDirection dir,
+ GstCaps * link_caps)
+{
+ gboolean can_do = FALSE;
+ GList *pads;
+
+ GST_OBJECT_LOCK (e);
+
+ pads = (dir == GST_PAD_SRC) ? e->srcpads : e->sinkpads;
+
+ while (!can_do && pads != NULL) {
+ GstPad *pad = pads->data;
+ GstCaps *caps;
+
+ caps = gst_pad_get_current_caps (pad);
+ if (caps == NULL)
+ caps = gst_pad_query_caps (pad, NULL);
+
+ can_do = gst_caps_can_intersect (caps, link_caps);
+
+ GST_TRACE ("can_do: %d for %" GST_PTR_FORMAT " and %" GST_PTR_FORMAT,
+ can_do, caps, link_caps);
+
+ gst_caps_unref (caps);
+
+ pads = pads->next;
+ }
+
+ GST_OBJECT_UNLOCK (e);
+
+ return can_do;
+}
+
/*
* performs a link and frees the struct. src and sink elements must be given
* return values 0 - link performed
return 0;
error:
- SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
- _("could not link %s to %s"), GST_ELEMENT_NAME (src),
- GST_ELEMENT_NAME (sink));
+ if (link->caps != NULL) {
+ gboolean src_can_do_caps, sink_can_do_caps;
+ gchar *caps_str = gst_caps_to_string (link->caps);
+
+ src_can_do_caps =
+ gst_parse_element_can_do_caps (src, GST_PAD_SRC, link->caps);
+ sink_can_do_caps =
+ gst_parse_element_can_do_caps (sink, GST_PAD_SINK, link->caps);
+
+ if (!src_can_do_caps && sink_can_do_caps) {
+ SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
+ _("could not link %s to %s, %s can't handle caps %s"),
+ GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink),
+ GST_ELEMENT_NAME (src), caps_str);
+ } else if (src_can_do_caps && !sink_can_do_caps) {
+ SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
+ _("could not link %s to %s, %s can't handle caps %s"),
+ GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink),
+ GST_ELEMENT_NAME (sink), caps_str);
+ } else if (!src_can_do_caps && !sink_can_do_caps) {
+ SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
+ _("could not link %s to %s, neither element can handle caps %s"),
+ GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink), caps_str);
+ } else {
+ SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
+ _("could not link %s to %s with caps %s"),
+ GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (sink), caps_str);
+ }
+ g_free (caps_str);
+ } else {
+ SET_ERROR (graph->error, GST_PARSE_ERROR_LINK,
+ _("could not link %s to %s"), GST_ELEMENT_NAME (src),
+ GST_ELEMENT_NAME (sink));
+ }
gst_parse_free_link (link);
return -1;
}