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-rw-r--r--ext/gconf/gstswitchsink.c270
1 files changed, 270 insertions, 0 deletions
diff --git a/ext/gconf/gstswitchsink.c b/ext/gconf/gstswitchsink.c
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+++ b/ext/gconf/gstswitchsink.c
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+/* GStreamer
+ * Copyright (c) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
+ * Copyright (c) 2006 Jürg Billeter <j@bitron.ch>
+ * Copyright (c) 2007 Jan Schmidt <thaytan@noraisin.net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <string.h>
+
+#include "gstswitchsink.h"
+
+GST_DEBUG_CATEGORY_STATIC (switch_debug);
+#define GST_CAT_DEFAULT switch_debug
+
+static void gst_switch_sink_dispose (GObject * object);
+static GstStateChangeReturn
+gst_switch_sink_change_state (GstElement * element, GstStateChange transition);
+
+enum
+{
+ PROP_0
+};
+
+GST_BOILERPLATE (GstSwitchSink, gst_switch_sink, GstBin, GST_TYPE_BIN);
+
+static void
+gst_switch_sink_base_init (gpointer klass)
+{
+ GST_DEBUG_CATEGORY_INIT (switch_debug, "switchsink", 0, "switchsink element");
+}
+
+static void
+gst_switch_sink_class_init (GstSwitchSinkClass * klass)
+{
+ GObjectClass *oklass = G_OBJECT_CLASS (klass);
+ GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
+ static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS_ANY);
+ GstPadTemplate *child_pad_templ;
+
+ oklass->dispose = gst_switch_sink_dispose;
+ eklass->change_state = gst_switch_sink_change_state;
+
+ /* Provide a default pad template if the child didn't */
+ child_pad_templ = gst_element_class_get_pad_template (eklass, "sink");
+ if (child_pad_templ == NULL) {
+ gst_element_class_add_pad_template (eklass,
+ gst_static_pad_template_get (&sink_template));
+ }
+}
+
+static gboolean
+gst_switch_sink_reset (GstSwitchSink * sink)
+{
+ /* this will install fakesink if no other child has been set,
+ * otherwise we rely on the subclass to know when to unset its
+ * custom kid */
+ if (sink->kid == NULL) {
+ return gst_switch_sink_set_child (sink, NULL);
+ }
+
+ return TRUE;
+}
+
+static void
+gst_switch_sink_init (GstSwitchSink * sink, GstSwitchSinkClass * g_class)
+{
+ GstElementClass *eklass = GST_ELEMENT_GET_CLASS (sink);
+ GstPadTemplate *templ;
+
+ templ = gst_element_class_get_pad_template (eklass, "sink");
+ sink->pad = gst_ghost_pad_new_no_target_from_template ("sink", templ);
+ gst_element_add_pad (GST_ELEMENT (sink), sink->pad);
+
+ gst_switch_sink_reset (sink);
+
+ GST_OBJECT_FLAG_SET (sink, GST_ELEMENT_IS_SINK);
+}
+
+static void
+gst_switch_sink_dispose (GObject * object)
+{
+ GstSwitchSink *sink = GST_SWITCH_SINK (object);
+ GstObject *new_kid, *kid;
+
+ GST_OBJECT_LOCK (sink);
+ new_kid = GST_OBJECT_CAST (sink->new_kid);
+ sink->new_kid = NULL;
+
+ kid = GST_OBJECT_CAST (sink->kid);
+ sink->kid = NULL;
+ GST_OBJECT_UNLOCK (sink);
+
+ gst_object_replace (&new_kid, NULL);
+ gst_object_replace (&kid, NULL);
+
+ GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
+}
+
+static gboolean
+gst_switch_sink_commit_new_kid (GstSwitchSink * sink)
+{
+ GstPad *targetpad;
+ GstState kid_state;
+ GstElement *new_kid, *old_kid;
+ gboolean is_fakesink = FALSE;
+ GstBus *bus;
+
+ /* need locking around member accesses */
+ GST_OBJECT_LOCK (sink);
+ /* If we're currently changing state, set the child to the next state
+ * we're transitioning too, rather than our current state which is
+ * about to change */
+ if (GST_STATE_NEXT (sink) != GST_STATE_VOID_PENDING)
+ kid_state = GST_STATE_NEXT (sink);
+ else
+ kid_state = GST_STATE (sink);
+
+ new_kid = sink->new_kid ? gst_object_ref (sink->new_kid) : NULL;
+ sink->new_kid = NULL;
+ GST_OBJECT_UNLOCK (sink);
+
+ /* Fakesink by default if NULL is passed as the new child */
+ if (new_kid == NULL) {
+ GST_DEBUG_OBJECT (sink, "Replacing kid with fakesink");
+ new_kid = gst_element_factory_make ("fakesink", "testsink");
+ if (new_kid == NULL) {
+ GST_ERROR_OBJECT (sink, "Failed to create fakesink");
+ return FALSE;
+ }
+ /* Add a reference, as it would if the element came from sink->new_kid */
+ gst_object_ref (new_kid);
+ g_object_set (new_kid, "sync", TRUE, NULL);
+ is_fakesink = TRUE;
+ } else {
+ GST_DEBUG_OBJECT (sink, "Setting new kid");
+ }
+
+ /* set temporary bus of our own to catch error messages from the child
+ * (could we just set our own bus on it, or would the state change messages
+ * from the not-yet-added element confuse the state change algorithm? Let's
+ * play it safe for now) */
+ bus = gst_bus_new ();
+ gst_element_set_bus (new_kid, bus);
+ gst_object_unref (bus);
+
+ if (gst_element_set_state (new_kid, kid_state) == GST_STATE_CHANGE_FAILURE) {
+ GstMessage *msg;
+
+ /* check if child posted an error message and if so re-post it on our bus
+ * so that the application gets to see a decent error and not our generic
+ * fallback error message which is completely indecipherable to the user */
+ msg = gst_bus_pop_filtered (GST_ELEMENT_BUS (new_kid), GST_MESSAGE_ERROR);
+ if (msg) {
+ GST_INFO_OBJECT (sink, "Forwarding kid error: %" GST_PTR_FORMAT, msg);
+ gst_element_post_message (GST_ELEMENT (sink), msg);
+ }
+ GST_ELEMENT_ERROR (sink, CORE, STATE_CHANGE, (NULL),
+ ("Failed to set state on new child."));
+ gst_element_set_bus (new_kid, NULL);
+ gst_object_unref (new_kid);
+ return FALSE;
+ }
+ gst_element_set_bus (new_kid, NULL);
+ gst_bin_add (GST_BIN (sink), new_kid);
+
+ /* Now, replace the existing child */
+ GST_OBJECT_LOCK (sink);
+ old_kid = sink->kid;
+ sink->kid = new_kid;
+ /* Mark whether a custom kid or fakesink has been installed */
+ sink->have_kid = !is_fakesink;
+ GST_OBJECT_UNLOCK (sink);
+
+ /* kill old element */
+ if (old_kid) {
+ GST_DEBUG_OBJECT (sink, "Removing old kid %" GST_PTR_FORMAT, old_kid);
+ gst_element_set_state (old_kid, GST_STATE_NULL);
+ gst_bin_remove (GST_BIN (sink), old_kid);
+ gst_object_unref (old_kid);
+ /* Don't lose the SINK flag */
+ GST_OBJECT_FLAG_SET (sink, GST_ELEMENT_IS_SINK);
+ }
+
+ /* re-attach ghostpad */
+ GST_DEBUG_OBJECT (sink, "Creating new ghostpad");
+ targetpad = gst_element_get_static_pad (sink->kid, "sink");
+ gst_ghost_pad_set_target (GST_GHOST_PAD (sink->pad), targetpad);
+ gst_object_unref (targetpad);
+ GST_DEBUG_OBJECT (sink, "done changing child of switchsink");
+
+ /* FIXME: Push new-segment info and pre-roll buffer(s) into the kid */
+
+ return TRUE;
+}
+
+gboolean
+gst_switch_sink_set_child (GstSwitchSink * sink, GstElement * new_kid)
+{
+ GstState cur, next;
+ GstElement **p_kid;
+
+ /* Nothing to do if clearing the child and we've already installed fakesink */
+ if (new_kid == NULL && sink->kid != NULL && sink->have_kid == FALSE)
+ return TRUE;
+
+ /* Store the new kid to be committed later */
+ GST_OBJECT_LOCK (sink);
+ cur = GST_STATE (sink);
+ next = GST_STATE_NEXT (sink);
+ p_kid = &sink->new_kid;
+ gst_object_replace ((GstObject **) p_kid, (GstObject *) new_kid);
+ GST_OBJECT_UNLOCK (sink);
+ if (new_kid)
+ gst_object_unref (new_kid);
+
+ /* Sometime, it would be lovely to allow sink changes even when
+ * already running, but this involves sending an appropriate new-segment
+ * and possibly prerolling etc */
+ /* FIXME: Block the pad and replace the kid when it completes */
+ if (cur > GST_STATE_READY || next == GST_STATE_PAUSED) {
+ GST_DEBUG_OBJECT (sink,
+ "Switch-sink is already running. Ignoring change of child.");
+ gst_object_unref (new_kid);
+ return TRUE;
+ }
+
+ return gst_switch_sink_commit_new_kid (sink);
+}
+
+static GstStateChangeReturn
+gst_switch_sink_change_state (GstElement * element, GstStateChange transition)
+{
+ GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
+ GstSwitchSink *sink = GST_SWITCH_SINK (element);
+
+ ret = GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS, change_state,
+ (element, transition), GST_STATE_CHANGE_SUCCESS);
+
+ switch (transition) {
+ case GST_STATE_CHANGE_READY_TO_NULL:
+ if (!gst_switch_sink_reset (sink))
+ ret = GST_STATE_CHANGE_FAILURE;
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
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