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1 files changed, 270 insertions, 0 deletions

diff --git a/ext/gconf/gstswitchsink.c b/ext/gconf/gstswitchsink.c
new file mode 100644
index 0000000..1fccf68
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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;
+}