camerabin: use private input-selector that still has "select-all" property

The "select-all" property was removed when input-selector was moved
to core, but camerabin uses this, so make camerabin use a private
copy until a better fix is found.

5 files changed, 1558 insertions, 2 deletions

diff --git a/gst/camerabin/Makefile.am b/gst/camerabin/Makefile.am
index d77dae464..7d7e55576 100644
--- a/gst/camerabin/Makefile.am
+++ b/gst/camerabin/Makefile.am
@@ -16,6 +16,7 @@ plugin_LTLIBRARIES = libgstcamerabin.la
 
 libgstcamerabin_la_SOURCES = gstcamerabin.c             \
 			  gstcamerabincolorbalance.c \
+			  gstinputselector.c         \
 			  camerabinimage.c           \
 			  camerabinvideo.c           \
 			  camerabingeneral.c         \
@@ -37,6 +38,7 @@ libgstcamerabin_la_LIBTOOLFLAGS = --tag=disable-static
 
 noinst_HEADERS = gstcamerabin.h             \
 		 gstcamerabincolorbalance.h \
+		 gstinputselector.h         \
 		 camerabinimage.h           \
 		 camerabinvideo.h           \
 		 camerabindebug.h           \
diff --git a/gst/camerabin/camerabingeneral.c b/gst/camerabin/camerabingeneral.c
index f1cf35da0..b82b22cfc 100644
--- a/gst/camerabin/camerabingeneral.c
+++ b/gst/camerabin/camerabingeneral.c
@@ -27,9 +27,10 @@
  *
  */
 #include <string.h>
+#include <glib.h>
 
 #include "camerabingeneral.h"
-#include <glib.h>
+#include "gstinputselector.h"
 
 GST_DEBUG_CATEGORY (gst_camerabin_debug);
 
@@ -128,7 +129,15 @@ gst_camerabin_create_and_add_element (GstBin * bin, const gchar * elem_name)
   g_return_val_if_fail (bin, FALSE);
   g_return_val_if_fail (elem_name, FALSE);
 
-  new_elem = gst_element_factory_make (elem_name, NULL);
+  if (strcmp (elem_name, "input-selector") == 0) {
+    /* we ship our own copy of input-selector because we still use the
+     * "select-all" property which was removed when input-selector was
+     * moved to core */
+    new_elem = g_object_new (GST_TYPE_INPUT_SELECTOR, NULL);
+  } else {
+    new_elem = gst_element_factory_make (elem_name, NULL);
+  }
+
   if (!new_elem) {
     GST_ELEMENT_ERROR (bin, CORE, MISSING_PLUGIN, (NULL),
         ("could not create \"%s\" element.", elem_name));
diff --git a/gst/camerabin/gstcamerabin-marshal.list b/gst/camerabin/gstcamerabin-marshal.list
index 40829e545..6bc959adb 100644
--- a/gst/camerabin/gstcamerabin-marshal.list
+++ b/gst/camerabin/gstcamerabin-marshal.list
@@ -4,3 +4,5 @@
 VOID:INT,INT,INT,INT
 VOID:INT,INT
 BOOLEAN:STRING
+INT64:VOID
+VOID:OBJECT,INT64,INT64
diff --git a/gst/camerabin/gstinputselector.c b/gst/camerabin/gstinputselector.c
new file mode 100644
index 000000000..75ecab1d2
--- /dev/null
+++ b/gst/camerabin/gstinputselector.c
@@ -0,0 +1,1459 @@
+/* GStreamer
+ * Copyright (C) 2003 Julien Moutte <julien@moutte.net>
+ * Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
+ * Copyright (C) 2005 Jan Schmidt <thaytan@mad.scientist.com>
+ * Copyright (C) 2007 Wim Taymans <wim.taymans@gmail.com>
+ * Copyright (C) 2007 Andy Wingo <wingo@pobox.com>
+ * Copyright (C) 2008 Nokia Corporation. (contact <stefan.kost@nokia.com>)
+ *
+ * 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.
+ */
+
+/**
+ * SECTION:element-input-selector
+ * @see_also: #GstOutputSelector
+ *
+ * Direct one out of N input streams to the output pad.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <string.h>
+
+#include "gstinputselector.h"
+#include "gstcamerabin-marshal.h"
+
+GST_DEBUG_CATEGORY_STATIC (input_selector_debug);
+#define GST_CAT_DEFAULT input_selector_debug
+
+static GstStaticPadTemplate gst_input_selector_sink_factory =
+GST_STATIC_PAD_TEMPLATE ("sink%d",
+    GST_PAD_SINK,
+    GST_PAD_REQUEST,
+    GST_STATIC_CAPS_ANY);
+
+static GstStaticPadTemplate gst_input_selector_src_factory =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS_ANY);
+
+enum
+{
+  PROP_0,
+  PROP_N_PADS,
+  PROP_ACTIVE_PAD,
+  PROP_SELECT_ALL,
+  PROP_LAST
+};
+
+#define DEFAULT_PAD_ALWAYS_OK	TRUE
+
+enum
+{
+  PROP_PAD_0,
+  PROP_PAD_RUNNING_TIME,
+  PROP_PAD_TAGS,
+  PROP_PAD_ACTIVE,
+  PROP_PAD_ALWAYS_OK,
+  PROP_PAD_LAST
+};
+
+enum
+{
+  /* methods */
+  SIGNAL_BLOCK,
+  SIGNAL_SWITCH,
+  LAST_SIGNAL
+};
+static guint gst_input_selector_signals[LAST_SIGNAL] = { 0 };
+
+static inline gboolean gst_input_selector_is_active_sinkpad (GstInputSelector *
+    sel, GstPad * pad);
+static GstPad *gst_input_selector_activate_sinkpad (GstInputSelector * sel,
+    GstPad * pad);
+static GstPad *gst_input_selector_get_linked_pad (GstPad * pad,
+    gboolean strict);
+static gboolean gst_input_selector_check_eos (GstElement * selector);
+
+#define GST_TYPE_SELECTOR_PAD \
+  (gst_selector_pad_get_type())
+#define GST_SELECTOR_PAD(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_SELECTOR_PAD, GstSelectorPad))
+#define GST_SELECTOR_PAD_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_SELECTOR_PAD, GstSelectorPadClass))
+#define GST_IS_SELECTOR_PAD(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_SELECTOR_PAD))
+#define GST_IS_SELECTOR_PAD_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_SELECTOR_PAD))
+#define GST_SELECTOR_PAD_CAST(obj) \
+  ((GstSelectorPad *)(obj))
+
+typedef struct _GstSelectorPad GstSelectorPad;
+typedef struct _GstSelectorPadClass GstSelectorPadClass;
+
+struct _GstSelectorPad
+{
+  GstPad parent;
+
+  gboolean active;              /* when buffer have passed the pad */
+  gboolean eos;                 /* when EOS has been received */
+  gboolean discont;             /* after switching we create a discont */
+  gboolean always_ok;
+  GstSegment segment;           /* the current segment on the pad */
+  GstTagList *tags;             /* last tags received on the pad */
+
+  gboolean segment_pending;
+};
+
+struct _GstSelectorPadClass
+{
+  GstPadClass parent;
+};
+
+static void gst_selector_pad_class_init (GstSelectorPadClass * klass);
+static void gst_selector_pad_init (GstSelectorPad * pad);
+static void gst_selector_pad_finalize (GObject * object);
+static void gst_selector_pad_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec);
+static void gst_selector_pad_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec);
+
+static GstPadClass *selector_pad_parent_class = NULL;
+
+static gint64 gst_selector_pad_get_running_time (GstSelectorPad * pad);
+static void gst_selector_pad_reset (GstSelectorPad * pad);
+static gboolean gst_selector_pad_event (GstPad * pad, GstEvent * event);
+static GstCaps *gst_selector_pad_getcaps (GstPad * pad);
+static gboolean gst_selector_pad_acceptcaps (GstPad * pad, GstCaps * caps);
+static GstIterator *gst_selector_pad_iterate_linked_pads (GstPad * pad);
+static GstFlowReturn gst_selector_pad_chain (GstPad * pad, GstBuffer * buf);
+static GstFlowReturn gst_selector_pad_bufferalloc (GstPad * pad,
+    guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
+
+static GType
+gst_selector_pad_get_type (void)
+{
+  static GType selector_pad_type = 0;
+
+  if (!selector_pad_type) {
+    static const GTypeInfo selector_pad_info = {
+      sizeof (GstSelectorPadClass),
+      NULL,
+      NULL,
+      (GClassInitFunc) gst_selector_pad_class_init,
+      NULL,
+      NULL,
+      sizeof (GstSelectorPad),
+      0,
+      (GInstanceInitFunc) gst_selector_pad_init,
+    };
+
+    selector_pad_type =
+        g_type_register_static (GST_TYPE_PAD, "GstCamerabinSelectorPad",
+        &selector_pad_info, 0);
+  }
+  return selector_pad_type;
+}
+
+static void
+gst_selector_pad_class_init (GstSelectorPadClass * klass)
+{
+  GObjectClass *gobject_class;
+
+  gobject_class = (GObjectClass *) klass;
+
+  selector_pad_parent_class = g_type_class_peek_parent (klass);
+
+  gobject_class->finalize = gst_selector_pad_finalize;
+
+  gobject_class->get_property = gst_selector_pad_get_property;
+  gobject_class->set_property = gst_selector_pad_set_property;
+
+  g_object_class_install_property (gobject_class, PROP_PAD_RUNNING_TIME,
+      g_param_spec_int64 ("running-time", "Running time",
+          "Running time of stream on pad", 0, G_MAXINT64, 0,
+          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_PAD_TAGS,
+      g_param_spec_boxed ("tags", "Tags",
+          "The currently active tags on the pad", GST_TYPE_TAG_LIST,
+          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_PAD_ACTIVE,
+      g_param_spec_boolean ("active", "Active",
+          "If the pad is currently active", FALSE,
+          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+  g_object_class_install_property (gobject_class, PROP_PAD_ALWAYS_OK,
+      g_param_spec_boolean ("always-ok", "Always OK",
+          "Make an inactive pad return OK instead of NOT_LINKED",
+          DEFAULT_PAD_ALWAYS_OK, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+}
+
+static void
+gst_selector_pad_init (GstSelectorPad * pad)
+{
+  pad->always_ok = DEFAULT_PAD_ALWAYS_OK;
+  gst_selector_pad_reset (pad);
+}
+
+static void
+gst_selector_pad_finalize (GObject * object)
+{
+  GstSelectorPad *pad;
+
+  pad = GST_SELECTOR_PAD_CAST (object);
+
+  if (pad->tags)
+    gst_tag_list_free (pad->tags);
+
+  G_OBJECT_CLASS (selector_pad_parent_class)->finalize (object);
+}
+
+static void
+gst_selector_pad_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
+
+  switch (prop_id) {
+    case PROP_PAD_ALWAYS_OK:
+      GST_OBJECT_LOCK (object);
+      spad->always_ok = g_value_get_boolean (value);
+      GST_OBJECT_UNLOCK (object);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_selector_pad_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstSelectorPad *spad = GST_SELECTOR_PAD_CAST (object);
+
+  switch (prop_id) {
+    case PROP_PAD_RUNNING_TIME:
+      g_value_set_int64 (value, gst_selector_pad_get_running_time (spad));
+      break;
+    case PROP_PAD_TAGS:
+      GST_OBJECT_LOCK (object);
+      g_value_set_boxed (value, spad->tags);
+      GST_OBJECT_UNLOCK (object);
+      break;
+    case PROP_PAD_ACTIVE:
+    {
+      GstInputSelector *sel;
+
+      sel = GST_INPUT_SELECTOR (gst_pad_get_parent (spad));
+      g_value_set_boolean (value, gst_input_selector_is_active_sinkpad (sel,
+              GST_PAD_CAST (spad)));
+      gst_object_unref (sel);
+      break;
+    }
+    case PROP_PAD_ALWAYS_OK:
+      GST_OBJECT_LOCK (object);
+      g_value_set_boolean (value, spad->always_ok);
+      GST_OBJECT_UNLOCK (object);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static gint64
+gst_selector_pad_get_running_time (GstSelectorPad * pad)
+{
+  gint64 ret = 0;
+
+  GST_OBJECT_LOCK (pad);
+  if (pad->active) {
+    gint64 last_stop = pad->segment.last_stop;
+
+    if (last_stop >= 0)
+      ret = gst_segment_to_running_time (&pad->segment, GST_FORMAT_TIME,
+          last_stop);
+  }
+  GST_OBJECT_UNLOCK (pad);
+
+  GST_DEBUG_OBJECT (pad, "running time: %" GST_TIME_FORMAT,
+      GST_TIME_ARGS (ret));
+
+  return ret;
+}
+
+static void
+gst_selector_pad_reset (GstSelectorPad * pad)
+{
+  GST_OBJECT_LOCK (pad);
+  pad->active = FALSE;
+  pad->eos = FALSE;
+  pad->segment_pending = FALSE;
+  pad->discont = FALSE;
+  gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED);
+  GST_OBJECT_UNLOCK (pad);
+}
+
+/* strictly get the linked pad from the sinkpad. If the pad is active we return
+ * the srcpad else we return NULL */
+static GstIterator *
+gst_selector_pad_iterate_linked_pads (GstPad * pad)
+{
+  GstInputSelector *sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
+  GstPad *otherpad;
+  GstIterator *it;
+
+  otherpad = gst_input_selector_get_linked_pad (pad, TRUE);
+  it = gst_iterator_new_single (GST_TYPE_PAD, otherpad,
+      (GstCopyFunction) gst_object_ref, (GFreeFunc) gst_object_unref);
+
+  if (otherpad)
+    gst_object_unref (otherpad);
+  gst_object_unref (sel);
+
+  return it;
+}
+
+static gboolean
+gst_selector_pad_event (GstPad * pad, GstEvent * event)
+{
+  gboolean res = TRUE;
+  gboolean forward = TRUE;
+  GstInputSelector *sel;
+  GstSelectorPad *selpad;
+  GstPad *prev_active_sinkpad;
+  GstPad *active_sinkpad;
+
+  sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
+  selpad = GST_SELECTOR_PAD_CAST (pad);
+
+  GST_INPUT_SELECTOR_LOCK (sel);
+  prev_active_sinkpad = sel->active_sinkpad;
+  active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
+
+  /* only forward if we are dealing with the active sinkpad or if select_all
+   * is enabled */
+  if (pad != active_sinkpad && !sel->select_all)
+    forward = FALSE;
+  GST_INPUT_SELECTOR_UNLOCK (sel);
+
+  if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad)
+    g_object_notify (G_OBJECT (sel), "active-pad");
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_FLUSH_START:
+      /* FIXME, flush out the waiter */
+      break;
+    case GST_EVENT_FLUSH_STOP:
+      GST_INPUT_SELECTOR_LOCK (sel);
+      gst_selector_pad_reset (selpad);
+      sel->pending_close = FALSE;
+      GST_INPUT_SELECTOR_UNLOCK (sel);
+      break;
+    case GST_EVENT_NEWSEGMENT:
+    {
+      gboolean update;
+      GstFormat format;
+      gdouble rate, arate;
+      gint64 start, stop, time;
+
+      gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
+          &start, &stop, &time);
+
+      GST_DEBUG_OBJECT (pad,
+          "configured NEWSEGMENT update %d, rate %lf, applied rate %lf, "
+          "format %d, "
+          "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
+          G_GINT64_FORMAT, update, rate, arate, format, start, stop, time);
+
+      GST_INPUT_SELECTOR_LOCK (sel);
+      GST_OBJECT_LOCK (selpad);
+      gst_segment_set_newsegment_full (&selpad->segment, update,
+          rate, arate, format, start, stop, time);
+      GST_OBJECT_UNLOCK (selpad);
+
+      /* If we aren't forwarding the event (because the pad is not the
+       * active_sinkpad, and select_all is not set, then set the flag on the
+       * that says a segment needs sending if/when that pad is activated.
+       * For all other cases, we send the event immediately, which makes
+       * sparse streams and other segment updates work correctly downstream.
+       */
+      if (!forward)
+        selpad->segment_pending = TRUE;
+
+      GST_INPUT_SELECTOR_UNLOCK (sel);
+      break;
+    }
+    case GST_EVENT_TAG:
+    {
+      GstTagList *tags, *oldtags, *newtags;
+
+      gst_event_parse_tag (event, &tags);
+
+      GST_OBJECT_LOCK (selpad);
+      oldtags = selpad->tags;
+
+      newtags = gst_tag_list_merge (oldtags, tags, GST_TAG_MERGE_REPLACE);
+      selpad->tags = newtags;
+      if (oldtags)
+        gst_tag_list_free (oldtags);
+      GST_DEBUG_OBJECT (pad, "received tags %" GST_PTR_FORMAT, newtags);
+      GST_OBJECT_UNLOCK (selpad);
+
+      g_object_notify (G_OBJECT (selpad), "tags");
+      break;
+    }
+    case GST_EVENT_EOS:
+      selpad->eos = TRUE;
+      GST_DEBUG_OBJECT (pad, "received EOS");
+      /* don't forward eos in select_all mode until all sink pads have eos */
+      if (sel->select_all && !gst_input_selector_check_eos (GST_ELEMENT (sel))) {
+        forward = FALSE;
+      }
+      break;
+    default:
+      break;
+  }
+  if (forward) {
+    GST_DEBUG_OBJECT (pad, "forwarding event");
+    res = gst_pad_push_event (sel->srcpad, event);
+  } else
+    gst_event_unref (event);
+
+  gst_object_unref (sel);
+
+  return res;
+}
+
+static GstCaps *
+gst_selector_pad_getcaps (GstPad * pad)
+{
+  GstInputSelector *sel;
+  GstCaps *caps;
+
+  sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
+
+  GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer");
+  caps = gst_pad_peer_get_caps_reffed (sel->srcpad);
+  if (caps == NULL)
+    caps = gst_caps_new_any ();
+
+  gst_object_unref (sel);
+
+  return caps;
+}
+
+static gboolean
+gst_selector_pad_acceptcaps (GstPad * pad, GstCaps * caps)
+{
+  GstInputSelector *sel;
+  gboolean res;
+
+  sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
+
+  GST_DEBUG_OBJECT (sel, "Checking acceptcaps of srcpad peer");
+  res = gst_pad_peer_accept_caps (sel->srcpad, caps);
+  gst_object_unref (sel);
+
+  return res;
+}
+
+static GstFlowReturn
+gst_selector_pad_bufferalloc (GstPad * pad, guint64 offset,
+    guint size, GstCaps * caps, GstBuffer ** buf)
+{
+  GstInputSelector *sel;
+  GstFlowReturn result;
+  GstPad *active_sinkpad;
+  GstPad *prev_active_sinkpad;
+  GstSelectorPad *selpad;
+
+  sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
+  selpad = GST_SELECTOR_PAD_CAST (pad);
+
+  GST_LOG_OBJECT (pad, "received alloc");
+
+  GST_INPUT_SELECTOR_LOCK (sel);
+  prev_active_sinkpad = sel->active_sinkpad;
+  active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
+
+  if (pad != active_sinkpad)
+    goto not_active;
+
+  GST_INPUT_SELECTOR_UNLOCK (sel);
+
+  if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad)
+    g_object_notify (G_OBJECT (sel), "active-pad");
+
+  result = gst_pad_alloc_buffer (sel->srcpad, offset, size, caps, buf);
+
+done:
+  gst_object_unref (sel);
+
+  return result;
+
+  /* ERRORS */
+not_active:
+  {
+    GST_INPUT_SELECTOR_UNLOCK (sel);
+
+    /* unselected pad, perform fallback alloc or return unlinked when
+     * asked */
+    GST_OBJECT_LOCK (selpad);
+    if (selpad->always_ok) {
+      GST_DEBUG_OBJECT (pad, "Not selected, performing fallback allocation");
+      *buf = NULL;
+      result = GST_FLOW_OK;
+    } else {
+      GST_DEBUG_OBJECT (pad, "Not selected, return NOT_LINKED");
+      result = GST_FLOW_NOT_LINKED;
+    }
+    GST_OBJECT_UNLOCK (selpad);
+
+    goto done;
+  }
+}
+
+/* must be called with the SELECTOR_LOCK, will block while the pad is blocked 
+ * or return TRUE when flushing */
+static gboolean
+gst_input_selector_wait (GstInputSelector * self, GstPad * pad)
+{
+  while (self->blocked && !self->flushing) {
+    /* we can be unlocked here when we are shutting down (flushing) or when we
+     * get unblocked */
+    GST_INPUT_SELECTOR_WAIT (self);
+  }
+  return self->flushing;
+}
+
+static GstFlowReturn
+gst_selector_pad_chain (GstPad * pad, GstBuffer * buf)
+{
+  GstInputSelector *sel;
+  GstFlowReturn res;
+  GstPad *active_sinkpad;
+  GstPad *prev_active_sinkpad;
+  GstSelectorPad *selpad;
+  GstClockTime start_time;
+  GstSegment *seg;
+  GstEvent *close_event = NULL, *start_event = NULL;
+  GstCaps *caps;
+
+  sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
+  selpad = GST_SELECTOR_PAD_CAST (pad);
+  seg = &selpad->segment;
+
+  GST_INPUT_SELECTOR_LOCK (sel);
+  /* wait or check for flushing */
+  if (gst_input_selector_wait (sel, pad))
+    goto flushing;
+
+  GST_LOG_OBJECT (pad, "getting active pad");
+
+  prev_active_sinkpad = sel->active_sinkpad;
+  active_sinkpad = gst_input_selector_activate_sinkpad (sel, pad);
+
+  /* update the segment on the srcpad */
+  start_time = GST_BUFFER_TIMESTAMP (buf);
+  if (GST_CLOCK_TIME_IS_VALID (start_time)) {
+    GST_LOG_OBJECT (pad, "received start time %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (start_time));
+    if (GST_BUFFER_DURATION_IS_VALID (buf))
+      GST_LOG_OBJECT (pad, "received end time %" GST_TIME_FORMAT,
+          GST_TIME_ARGS (start_time + GST_BUFFER_DURATION (buf)));
+
+    GST_OBJECT_LOCK (pad);
+    gst_segment_set_last_stop (seg, seg->format, start_time);
+    GST_OBJECT_UNLOCK (pad);
+  }
+
+  /* Ignore buffers from pads except the selected one */
+  if (pad != active_sinkpad)
+    goto ignore;
+
+  if (G_UNLIKELY (sel->pending_close)) {
+    GstSegment *cseg = &sel->segment;
+
+    GST_DEBUG_OBJECT (sel,
+        "pushing close NEWSEGMENT update %d, rate %lf, applied rate %lf, "
+        "format %d, "
+        "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
+        G_GINT64_FORMAT, TRUE, cseg->rate, cseg->applied_rate, cseg->format,
+        cseg->start, cseg->stop, cseg->time);
+
+    /* create update segment */
+    close_event = gst_event_new_new_segment_full (TRUE, cseg->rate,
+        cseg->applied_rate, cseg->format, cseg->start, cseg->stop, cseg->time);
+
+    sel->pending_close = FALSE;
+  }
+  /* if we have a pending segment, push it out now */
+  if (G_UNLIKELY (selpad->segment_pending)) {
+    GST_DEBUG_OBJECT (pad,
+        "pushing pending NEWSEGMENT update %d, rate %lf, applied rate %lf, "
+        "format %d, "
+        "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
+        G_GINT64_FORMAT, FALSE, seg->rate, seg->applied_rate, seg->format,
+        seg->start, seg->stop, seg->time);
+
+    start_event = gst_event_new_new_segment_full (FALSE, seg->rate,
+        seg->applied_rate, seg->format, seg->start, seg->stop, seg->time);
+
+    selpad->segment_pending = FALSE;
+  }
+  GST_INPUT_SELECTOR_UNLOCK (sel);
+
+  if (prev_active_sinkpad != active_sinkpad && pad == active_sinkpad)
+    g_object_notify (G_OBJECT (sel), "active-pad");
+
+  if (close_event)
+    gst_pad_push_event (sel->srcpad, close_event);
+
+  if (start_event)
+    gst_pad_push_event (sel->srcpad, start_event);
+
+  if (selpad->discont) {
+    buf = gst_buffer_make_metadata_writable (buf);
+
+    GST_DEBUG_OBJECT (pad, "Marking discont buffer %p", buf);
+    GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
+    selpad->discont = FALSE;
+  }
+
+  /* forward */
+  GST_LOG_OBJECT (pad, "Forwarding buffer %p", buf);
+
+  if ((caps = GST_BUFFER_CAPS (buf))) {
+    if (GST_PAD_CAPS (sel->srcpad) != caps)
+      gst_pad_set_caps (sel->srcpad, caps);
+  }
+
+  res = gst_pad_push (sel->srcpad, buf);
+
+done:
+  gst_object_unref (sel);
+  return res;
+
+  /* dropped buffers */
+ignore:
+  {
+    GST_DEBUG_OBJECT (pad, "Pad not active, discard buffer %p", buf);
+    /* when we drop a buffer, we're creating a discont on this pad */
+    selpad->discont = TRUE;
+    GST_INPUT_SELECTOR_UNLOCK (sel);
+    gst_buffer_unref (buf);
+
+    /* figure out what to return upstream */
+    GST_OBJECT_LOCK (selpad);
+    if (selpad->always_ok)
+      res = GST_FLOW_OK;
+    else
+      res = GST_FLOW_NOT_LINKED;
+    GST_OBJECT_UNLOCK (selpad);
+
+    goto done;
+  }
+flushing:
+  {
+    GST_DEBUG_OBJECT (pad, "We are flushing, discard buffer %p", buf);
+    GST_INPUT_SELECTOR_UNLOCK (sel);
+    gst_buffer_unref (buf);
+    res = GST_FLOW_WRONG_STATE;
+    goto done;
+  }
+}
+
+static void gst_input_selector_init (GstInputSelector * sel);
+static void gst_input_selector_base_init (GstInputSelectorClass * klass);
+static void gst_input_selector_class_init (GstInputSelectorClass * klass);
+
+static void gst_input_selector_dispose (GObject * object);
+
+static void gst_input_selector_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec);
+static void gst_input_selector_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec);
+
+static GstPad *gst_input_selector_request_new_pad (GstElement * element,
+    GstPadTemplate * templ, const gchar * unused);
+static void gst_input_selector_release_pad (GstElement * element, GstPad * pad);
+
+static GstStateChangeReturn gst_input_selector_change_state (GstElement *
+    element, GstStateChange transition);
+
+static GstCaps *gst_input_selector_getcaps (GstPad * pad);
+static gboolean gst_input_selector_event (GstPad * pad, GstEvent * event);
+static gboolean gst_input_selector_query (GstPad * pad, GstQuery * query);
+static gint64 gst_input_selector_block (GstInputSelector * self);
+static void gst_input_selector_switch (GstInputSelector * self,
+    GstPad * pad, gint64 stop_time, gint64 start_time);
+
+static GstElementClass *parent_class = NULL;
+
+GType
+gst_input_selector_get_type (void)
+{
+  static GType input_selector_type = 0;
+
+  if (!input_selector_type) {
+    static const GTypeInfo input_selector_info = {
+      sizeof (GstInputSelectorClass),
+      (GBaseInitFunc) gst_input_selector_base_init,
+      NULL,
+      (GClassInitFunc) gst_input_selector_class_init,
+      NULL,
+      NULL,
+      sizeof (GstInputSelector),
+      0,
+      (GInstanceInitFunc) gst_input_selector_init,
+    };
+    input_selector_type =
+        g_type_register_static (GST_TYPE_ELEMENT,
+        "GstCamerabinInputSelector", &input_selector_info, 0);
+    GST_DEBUG_CATEGORY_INIT (input_selector_debug,
+        "camerabin-input-selector", 0, "Camerabin input selector element");
+  }
+
+  return input_selector_type;
+}
+
+static void
+gst_input_selector_base_init (GstInputSelectorClass * klass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  gst_element_class_set_details_simple (element_class,
+      "Input selector", "Generic",
+      "N-to-1 input stream selectoring",
+      "Julien Moutte <julien@moutte.net>, "
+      "Jan Schmidt <thaytan@mad.scientist.com>, "
+      "Wim Taymans <wim.taymans@gmail.com>");
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_input_selector_sink_factory));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_input_selector_src_factory));
+}
+
+static void
+gst_input_selector_class_init (GstInputSelectorClass * klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
+
+  parent_class = g_type_class_peek_parent (klass);
+
+  /* FIXME: remove after confirming it is safe now */
+  g_type_class_ref (gst_selector_pad_get_type ());
+
+  gobject_class->dispose = gst_input_selector_dispose;
+
+  gobject_class->set_property = gst_input_selector_set_property;
+  gobject_class->get_property = gst_input_selector_get_property;
+
+  g_object_class_install_property (gobject_class, PROP_N_PADS,
+      g_param_spec_uint ("n-pads", "Number of Pads",
+          "The number of sink pads", 0, G_MAXUINT, 0,
+          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
+      g_param_spec_object ("active-pad", "Active pad",
+          "The currently active sink pad", GST_TYPE_PAD,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (gobject_class, PROP_SELECT_ALL,
+      g_param_spec_boolean ("select-all", "Select all mode",
+          "Forwards data from all input pads", FALSE,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  /**
+   * GstInputSelector::block:
+   * @inputselector: the #GstInputSelector
+   *
+   * Block all sink pads in preparation for a switch. Returns the stop time of
+   * the current switch segment, as a running time, or 0 if there is no current
+   * active pad or the current active pad never received data.
+   */
+  gst_input_selector_signals[SIGNAL_BLOCK] =
+      g_signal_new ("block", G_TYPE_FROM_CLASS (klass),
+      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
+      G_STRUCT_OFFSET (GstInputSelectorClass, block), NULL, NULL,
+      __gst_camerabin_marshal_INT64__VOID, G_TYPE_INT64, 0);
+  /**
+   * GstInputSelector::switch:
+   * @inputselector: the #GstInputSelector
+   * @pad:            the pad to switch to
+   * @stop_time:      running time at which to close the previous segment, or -1
+   *                  to use the running time of the previously active sink pad
+   * @start_time:     running time at which to start the new segment, or -1 to
+   *                  use the running time of the newly active sink pad
+   *
+   * Switch to a new feed. The segment opened by the previously active pad, if
+   * any, will be closed, and a new segment opened before data flows again.
+   *
+   * This signal must be emitted when the element has been blocked via the <link
+   * linkend="GstInputSelector-block">block</link> signal.
+   *
+   * If you have a stream with only one switch element, such as an audio-only
+   * stream, a stream switch should be performed by first emitting the block
+   * signal, and then emitting the switch signal with -1 for the stop and start
+   * time values.
+   *
+   * The intention of the @stop_time and @start_time arguments is to allow
+   * multiple switch elements to switch and maintain stream synchronization.
+   * When switching a stream with multiple feeds, you will need as many switch
+   * elements as you have feeds. For example, a feed with audio and video will
+   * have one switch element between the audio feeds and one for video.
+   *
+   * A switch over multiple switch elements should be performed as follows:
+   * First, emit the <link linkend="GstInputSelector-block">block</link>
+   * signal, collecting the returned values. The maximum running time returned
+   * by block should then be used as the time at which to close the previous
+   * segment.
+   *
+   * Then, query the running times of the new audio and video pads that you will
+   * switch to. Naturally, these pads are on separate switch elements. Take the
+   * minimum running time for those streams and use it for the time at which to
+   * open the new segment.
+   *
+   * If @pad is the same as the current active pad, the element will cancel any
+   * previous block without adjusting segments.
+   *
+   * <note><simpara>
+   * the signal changed from accepting the pad name to the pad object.
+   * </simpara></note>
+   *
+   * Since: 0.10.7
+   */
+  gst_input_selector_signals[SIGNAL_SWITCH] =
+      g_signal_new ("switch", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
+      G_STRUCT_OFFSET (GstInputSelectorClass, switch_),
+      NULL, NULL, __gst_camerabin_marshal_VOID__OBJECT_INT64_INT64,
+      G_TYPE_NONE, 3, GST_TYPE_PAD, G_TYPE_INT64, G_TYPE_INT64);
+
+  gstelement_class->request_new_pad = gst_input_selector_request_new_pad;
+  gstelement_class->release_pad = gst_input_selector_release_pad;
+  gstelement_class->change_state = gst_input_selector_change_state;
+
+  klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block);
+  /* note the underscore because switch is a keyword otherwise */
+  klass->switch_ = GST_DEBUG_FUNCPTR (gst_input_selector_switch);
+}
+
+static void
+gst_input_selector_init (GstInputSelector * sel)
+{
+  sel->srcpad = gst_pad_new ("src", GST_PAD_SRC);
+  gst_pad_set_iterate_internal_links_function (sel->srcpad,
+      GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
+  gst_pad_set_getcaps_function (sel->srcpad,
+      GST_DEBUG_FUNCPTR (gst_input_selector_getcaps));
+  gst_pad_set_query_function (sel->srcpad,
+      GST_DEBUG_FUNCPTR (gst_input_selector_query));
+  gst_pad_set_event_function (sel->srcpad,
+      GST_DEBUG_FUNCPTR (gst_input_selector_event));
+  gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad);
+  /* sinkpad management */
+  sel->active_sinkpad = NULL;
+  sel->padcount = 0;
+  gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
+
+  sel->lock = g_mutex_new ();
+  sel->cond = g_cond_new ();
+  sel->blocked = FALSE;
+
+  sel->select_all = FALSE;
+}
+
+static void
+gst_input_selector_dispose (GObject * object)
+{
+  GstInputSelector *sel = GST_INPUT_SELECTOR (object);
+
+  if (sel->active_sinkpad) {
+    gst_object_unref (sel->active_sinkpad);
+    sel->active_sinkpad = NULL;
+  }
+  if (sel->lock) {
+    g_mutex_free (sel->lock);
+    sel->lock = NULL;
+  }
+  if (sel->cond) {
+    g_cond_free (sel->cond);
+    sel->cond = NULL;
+  }
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+/* Solve the following equation for B.timestamp, and set that as the segment
+ * stop:
+ * B.running_time = (B.timestamp - NS.start) / NS.abs_rate + NS.accum
+ */
+static gint64
+gst_segment_get_timestamp (GstSegment * segment, gint64 running_time)
+{
+  if (running_time <= segment->accum)
+    return segment->start;
+  else
+    return (running_time - segment->accum) * segment->abs_rate + segment->start;
+}
+
+static void
+gst_segment_set_stop (GstSegment * segment, gint64 running_time)
+{
+  segment->stop = gst_segment_get_timestamp (segment, running_time);
+  segment->last_stop = -1;
+}
+
+static void
+gst_segment_set_start (GstSegment * segment, gint64 running_time)
+{
+  gint64 new_start, duration;
+
+  new_start = gst_segment_get_timestamp (segment, running_time);
+
+  /* this is the duration we skipped */
+  duration = new_start - segment->start;
+  /* add the duration to the accumulated segment time */
+  segment->accum += duration;
+  /* move position in the segment */
+  segment->time += duration;
+  segment->start += duration;
+}
+
+/* this function must be called with the SELECTOR_LOCK. It returns TRUE when the
+ * active pad changed. */
+static gboolean
+gst_input_selector_set_active_pad (GstInputSelector * self,
+    GstPad * pad, gint64 stop_time, gint64 start_time)
+{
+  GstSelectorPad *old, *new;
+  GstPad **active_pad_p;
+
+  if (pad == self->active_sinkpad)
+    return FALSE;
+
+  old = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
+  new = GST_SELECTOR_PAD_CAST (pad);
+
+  GST_DEBUG_OBJECT (self, "setting active pad to %s:%s",
+      GST_DEBUG_PAD_NAME (new));
+
+  if (!GST_CLOCK_TIME_IS_VALID (stop_time) && old) {
+    /* no stop time given, get the latest running_time on the active pad to 
+     * close and open the new segment */
+    stop_time = start_time = gst_selector_pad_get_running_time (old);
+    GST_DEBUG_OBJECT (self, "using start/stop of %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (start_time));
+  }
+
+  if (old && old->active && !self->pending_close && stop_time >= 0) {
+    /* schedule a last_stop update if one isn't already scheduled, and a
+       segment has been pushed before. */
+    memcpy (&self->segment, &old->segment, sizeof (self->segment));
+
+    GST_DEBUG_OBJECT (self, "setting stop_time to %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (stop_time));
+    gst_segment_set_stop (&self->segment, stop_time);
+    self->pending_close = TRUE;
+  }
+
+  if (new && new->active && start_time >= 0) {
+    GST_DEBUG_OBJECT (self, "setting start_time to %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (start_time));
+    /* schedule a new segment push */
+    gst_segment_set_start (&new->segment, start_time);
+    new->segment_pending = TRUE;
+  }
+
+  active_pad_p = &self->active_sinkpad;
+  gst_object_replace ((GstObject **) active_pad_p, GST_OBJECT_CAST (pad));
+  GST_DEBUG_OBJECT (self, "New active pad is %" GST_PTR_FORMAT,
+      self->active_sinkpad);
+
+  return TRUE;
+}
+
+static void
+gst_input_selector_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstInputSelector *sel = GST_INPUT_SELECTOR (object);
+
+  switch (prop_id) {
+    case PROP_ACTIVE_PAD:
+    {
+      GstPad *pad;
+
+      pad = g_value_get_object (value);
+
+      GST_INPUT_SELECTOR_LOCK (sel);
+      gst_input_selector_set_active_pad (sel, pad,
+          GST_CLOCK_TIME_NONE, GST_CLOCK_TIME_NONE);
+      GST_INPUT_SELECTOR_UNLOCK (sel);
+      break;
+    }
+    case PROP_SELECT_ALL:
+      GST_INPUT_SELECTOR_LOCK (object);
+      sel->select_all = g_value_get_boolean (value);
+      GST_INPUT_SELECTOR_UNLOCK (object);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_input_selector_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstInputSelector *sel = GST_INPUT_SELECTOR (object);
+
+  switch (prop_id) {
+    case PROP_N_PADS:
+      GST_INPUT_SELECTOR_LOCK (object);
+      g_value_set_uint (value, sel->n_pads);
+      GST_INPUT_SELECTOR_UNLOCK (object);
+      break;
+    case PROP_ACTIVE_PAD:
+      GST_INPUT_SELECTOR_LOCK (object);
+      g_value_set_object (value, sel->active_sinkpad);
+      GST_INPUT_SELECTOR_UNLOCK (object);
+      break;
+    case PROP_SELECT_ALL:
+      GST_INPUT_SELECTOR_LOCK (object);
+      g_value_set_boolean (value, sel->select_all);
+      GST_INPUT_SELECTOR_UNLOCK (object);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstPad *
+gst_input_selector_get_linked_pad (GstPad * pad, gboolean strict)
+{
+  GstInputSelector *sel;
+  GstPad *otherpad = NULL;
+
+  sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
+
+  GST_INPUT_SELECTOR_LOCK (sel);
+  if (pad == sel->srcpad)
+    otherpad = sel->active_sinkpad;
+  else if (pad == sel->active_sinkpad || !strict)
+    otherpad = sel->srcpad;
+  if (otherpad)
+    gst_object_ref (otherpad);
+  GST_INPUT_SELECTOR_UNLOCK (sel);
+
+  gst_object_unref (sel);
+
+  return otherpad;
+}
+
+static gboolean
+gst_input_selector_event (GstPad * pad, GstEvent * event)
+{
+  gboolean res = FALSE;
+  GstPad *otherpad;
+
+  otherpad = gst_input_selector_get_linked_pad (pad, TRUE);
+
+  if (otherpad) {
+    res = gst_pad_push_event (otherpad, event);
+
+    gst_object_unref (otherpad);
+  } else
+    gst_event_unref (event);
+  return res;
+}
+
+/* query on the srcpad. We override this function because by default it will
+ * only forward the query to one random sinkpad */
+static gboolean
+gst_input_selector_query (GstPad * pad, GstQuery * query)
+{
+  gboolean res = TRUE;
+  GstInputSelector *sel;
+  GstPad *otherpad;
+
+  sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
+
+  otherpad = gst_input_selector_get_linked_pad (pad, TRUE);
+
+  switch (GST_QUERY_TYPE (query)) {
+    case GST_QUERY_LATENCY:
+    {
+      GList *walk;
+      GstClockTime resmin, resmax;
+      gboolean reslive;
+
+      resmin = 0;
+      resmax = -1;
+      reslive = FALSE;
+
+      /* assume FALSE, we become TRUE if one query succeeds */
+      res = FALSE;
+
+      /* perform the query on all sinkpads and combine the results. We take the
+       * max of min and the min of max for the result latency. */
+      GST_INPUT_SELECTOR_LOCK (sel);
+      for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk;
+          walk = g_list_next (walk)) {
+        GstPad *sinkpad = GST_PAD_CAST (walk->data);
+
+        if (gst_pad_peer_query (sinkpad, query)) {
+          GstClockTime min, max;
+          gboolean live;
+
+          /* one query succeeded, we succeed too */
+          res = TRUE;
+
+          gst_query_parse_latency (query, &live, &min, &max);
+
+          GST_DEBUG_OBJECT (sinkpad,
+              "peer latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
+              ", live %d", GST_TIME_ARGS (min), GST_TIME_ARGS (max), live);
+
+          if (live) {
+            if (min > resmin)
+              resmin = min;
+            if (resmax == -1)
+              resmax = max;
+            else if (max < resmax)
+              resmax = max;
+            if (reslive == FALSE)
+              reslive = live;
+          }
+        }
+      }
+      GST_INPUT_SELECTOR_UNLOCK (sel);
+      if (res) {
+        gst_query_set_latency (query, reslive, resmin, resmax);
+
+        GST_DEBUG_OBJECT (sel,
+            "total latency min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT
+            ", live %d", GST_TIME_ARGS (resmin), GST_TIME_ARGS (resmax),
+            reslive);
+      }
+
+      break;
+    }
+    default:
+      if (otherpad)
+        res = gst_pad_peer_query (otherpad, query);
+      break;
+  }
+  if (otherpad)
+    gst_object_unref (otherpad);
+  gst_object_unref (sel);
+
+  return res;
+}
+
+static GstCaps *
+gst_input_selector_getcaps (GstPad * pad)
+{
+  GstPad *otherpad;
+  GstObject *parent;
+  GstCaps *caps;
+
+  parent = gst_object_get_parent (GST_OBJECT (pad));
+
+  otherpad = gst_input_selector_get_linked_pad (pad, FALSE);
+
+  if (!otherpad) {
+    if (GST_INPUT_SELECTOR (parent)->select_all) {
+      GST_DEBUG_OBJECT (parent,
+          "Pad %s:%s not linked, returning merge of caps",
+          GST_DEBUG_PAD_NAME (pad));
+      caps = gst_pad_proxy_getcaps (pad);
+    } else {
+      GST_DEBUG_OBJECT (parent,
+          "Pad %s:%s not linked, returning ANY", GST_DEBUG_PAD_NAME (pad));
+      caps = gst_caps_new_any ();
+    }
+  } else {
+    GST_DEBUG_OBJECT (parent,
+        "Pad %s:%s is linked (to %s:%s), returning peer caps",
+        GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (otherpad));
+    /* if the peer has caps, use those. If the pad is not linked, this function
+     * returns NULL and we return ANY */
+    if (!(caps = gst_pad_peer_get_caps_reffed (otherpad)))
+      caps = gst_caps_new_any ();
+    gst_object_unref (otherpad);
+  }
+
+  gst_object_unref (parent);
+  return caps;
+}
+
+/* check if the pad is the active sinkpad */
+static gboolean
+gst_input_selector_is_active_sinkpad (GstInputSelector * sel, GstPad * pad)
+{
+  gboolean res;
+
+  GST_INPUT_SELECTOR_LOCK (sel);
+  res = (pad == sel->active_sinkpad);
+  GST_INPUT_SELECTOR_UNLOCK (sel);
+
+  return res;
+}
+
+/* Get or create the active sinkpad, must be called with SELECTOR_LOCK */
+static GstPad *
+gst_input_selector_activate_sinkpad (GstInputSelector * sel, GstPad * pad)
+{
+  GstPad *active_sinkpad;
+  GstSelectorPad *selpad;
+
+  selpad = GST_SELECTOR_PAD_CAST (pad);
+
+  selpad->active = TRUE;
+  active_sinkpad = sel->active_sinkpad;
+  if (active_sinkpad == NULL || sel->select_all) {
+    /* first pad we get activity on becomes the activated pad by default, if we
+     * select all, we also remember the last used pad. */
+    if (sel->active_sinkpad)
+      gst_object_unref (sel->active_sinkpad);
+    active_sinkpad = sel->active_sinkpad = gst_object_ref (pad);
+    GST_DEBUG_OBJECT (sel, "Activating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
+  }
+
+  return active_sinkpad;
+}
+
+static GstPad *
+gst_input_selector_request_new_pad (GstElement * element,
+    GstPadTemplate * templ, const gchar * unused)
+{
+  GstInputSelector *sel;
+  gchar *name = NULL;
+  GstPad *sinkpad = NULL;
+
+  g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
+
+  sel = GST_INPUT_SELECTOR (element);
+
+  GST_INPUT_SELECTOR_LOCK (sel);
+
+  GST_LOG_OBJECT (sel, "Creating new pad %d", sel->padcount);
+  name = g_strdup_printf ("sink%d", sel->padcount++);
+  sinkpad = g_object_new (GST_TYPE_SELECTOR_PAD,
+      "name", name, "direction", templ->direction, "template", templ, NULL);
+  g_free (name);
+
+  sel->n_pads++;
+
+  gst_pad_set_event_function (sinkpad,
+      GST_DEBUG_FUNCPTR (gst_selector_pad_event));
+  gst_pad_set_getcaps_function (sinkpad,
+      GST_DEBUG_FUNCPTR (gst_selector_pad_getcaps));
+  gst_pad_set_acceptcaps_function (sinkpad,
+      GST_DEBUG_FUNCPTR (gst_selector_pad_acceptcaps));
+  gst_pad_set_chain_function (sinkpad,
+      GST_DEBUG_FUNCPTR (gst_selector_pad_chain));
+  gst_pad_set_iterate_internal_links_function (sinkpad,
+      GST_DEBUG_FUNCPTR (gst_selector_pad_iterate_linked_pads));
+  gst_pad_set_bufferalloc_function (sinkpad,
+      GST_DEBUG_FUNCPTR (gst_selector_pad_bufferalloc));
+
+  gst_pad_set_active (sinkpad, TRUE);
+  gst_element_add_pad (GST_ELEMENT (sel), sinkpad);
+  GST_INPUT_SELECTOR_UNLOCK (sel);
+
+  return sinkpad;
+}
+
+static void
+gst_input_selector_release_pad (GstElement * element, GstPad * pad)
+{
+  GstInputSelector *sel;
+
+  sel = GST_INPUT_SELECTOR (element);
+  GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
+
+  GST_INPUT_SELECTOR_LOCK (sel);
+  /* if the pad was the active pad, makes us select a new one */
+  if (sel->active_sinkpad == pad) {
+    GST_DEBUG_OBJECT (sel, "Deactivating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
+    gst_object_unref (sel->active_sinkpad);
+    sel->active_sinkpad = NULL;
+  }
+  sel->n_pads--;
+
+  gst_pad_set_active (pad, FALSE);
+  gst_element_remove_pad (GST_ELEMENT (sel), pad);
+  GST_INPUT_SELECTOR_UNLOCK (sel);
+}
+
+static void
+gst_input_selector_reset (GstInputSelector * sel)
+{
+  GList *walk;
+
+  GST_INPUT_SELECTOR_LOCK (sel);
+  /* clear active pad */
+  if (sel->active_sinkpad) {
+    gst_object_unref (sel->active_sinkpad);
+    sel->active_sinkpad = NULL;
+  }
+  /* reset segment */
+  gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
+  sel->pending_close = FALSE;
+  /* reset each of our sinkpads state */
+  for (walk = GST_ELEMENT_CAST (sel)->sinkpads; walk; walk = g_list_next (walk)) {
+    GstSelectorPad *selpad = GST_SELECTOR_PAD_CAST (walk->data);
+
+    gst_selector_pad_reset (selpad);
+
+    if (selpad->tags) {
+      gst_tag_list_free (selpad->tags);
+      selpad->tags = NULL;
+    }
+  }
+  GST_INPUT_SELECTOR_UNLOCK (sel);
+}
+
+static GstStateChangeReturn
+gst_input_selector_change_state (GstElement * element,
+    GstStateChange transition)
+{
+  GstInputSelector *self = GST_INPUT_SELECTOR (element);
+  GstStateChangeReturn result;
+
+  switch (transition) {
+    case GST_STATE_CHANGE_READY_TO_PAUSED:
+      GST_INPUT_SELECTOR_LOCK (self);
+      self->blocked = FALSE;
+      self->flushing = FALSE;
+      GST_INPUT_SELECTOR_UNLOCK (self);
+      break;
+    case GST_STATE_CHANGE_PAUSED_TO_READY:
+      /* first unlock before we call the parent state change function, which
+       * tries to acquire the stream lock when going to ready. */
+      GST_INPUT_SELECTOR_LOCK (self);
+      self->blocked = FALSE;
+      self->flushing = TRUE;
+      GST_INPUT_SELECTOR_BROADCAST (self);
+      GST_INPUT_SELECTOR_UNLOCK (self);
+      break;
+    default:
+      break;
+  }
+
+  result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_PAUSED_TO_READY:
+      gst_input_selector_reset (self);
+      break;
+    default:
+      break;
+  }
+
+  return result;
+}
+
+static gint64
+gst_input_selector_block (GstInputSelector * self)
+{
+  gint64 ret = 0;
+  GstSelectorPad *spad;
+
+  GST_INPUT_SELECTOR_LOCK (self);
+
+  if (self->blocked)
+    GST_WARNING_OBJECT (self, "switch already blocked");
+
+  self->blocked = TRUE;
+  spad = GST_SELECTOR_PAD_CAST (self->active_sinkpad);
+
+  if (spad)
+    ret = gst_selector_pad_get_running_time (spad);
+  else
+    GST_DEBUG_OBJECT (self, "no active pad while blocking");
+
+  GST_INPUT_SELECTOR_UNLOCK (self);
+
+  return ret;
+}
+
+/* stop_time and start_time are running times */
+static void
+gst_input_selector_switch (GstInputSelector * self, GstPad * pad,
+    gint64 stop_time, gint64 start_time)
+{
+  gboolean changed;
+
+  g_return_if_fail (self->blocked == TRUE);
+
+  GST_INPUT_SELECTOR_LOCK (self);
+  changed =
+      gst_input_selector_set_active_pad (self, pad, stop_time, start_time);
+
+  self->blocked = FALSE;
+  GST_INPUT_SELECTOR_BROADCAST (self);
+  GST_INPUT_SELECTOR_UNLOCK (self);
+
+  if (changed)
+    g_object_notify (G_OBJECT (self), "active-pad");
+}
+
+static gboolean
+gst_input_selector_check_eos (GstElement * selector)
+{
+  GstIterator *it = gst_element_iterate_sink_pads (selector);
+  GstIteratorResult ires;
+  gpointer item;
+  gboolean done = FALSE, is_eos = FALSE;
+  GstSelectorPad *pad;
+
+  while (!done) {
+    ires = gst_iterator_next (it, &item);
+    switch (ires) {
+      case GST_ITERATOR_DONE:
+        GST_INFO_OBJECT (selector, "all sink pads have eos");
+        done = TRUE;
+        is_eos = TRUE;
+        break;
+      case GST_ITERATOR_OK:
+        pad = GST_SELECTOR_PAD_CAST (item);
+        if (!pad->eos) {
+          done = TRUE;
+        }
+        gst_object_unref (pad);
+        break;
+      case GST_ITERATOR_RESYNC:
+        gst_iterator_resync (it);
+        break;
+      default:
+        done = TRUE;
+        break;
+    }
+  }
+  gst_iterator_free (it);
+
+  return is_eos;
+}
diff --git a/gst/camerabin/gstinputselector.h b/gst/camerabin/gstinputselector.h
new file mode 100644
index 000000000..58a671d50
--- /dev/null
+++ b/gst/camerabin/gstinputselector.h
@@ -0,0 +1,84 @@
+/* GStreamer
+ * Copyright (C) 2003 Julien Moutte <julien@moutte.net>
+ * Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
+ * Copyright (C) 2008 Nokia Corporation. (contact <stefan.kost@nokia.com>)
+ *
+ * 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.
+ */
+ 
+#ifndef __GST_INPUT_SELECTOR_H__
+#define __GST_INPUT_SELECTOR_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_INPUT_SELECTOR \
+  (gst_input_selector_get_type())
+#define GST_INPUT_SELECTOR(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_INPUT_SELECTOR, GstInputSelector))
+#define GST_INPUT_SELECTOR_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_INPUT_SELECTOR, GstInputSelectorClass))
+#define GST_IS_INPUT_SELECTOR(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_INPUT_SELECTOR))
+#define GST_IS_INPUT_SELECTOR_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_INPUT_SELECTOR))
+
+typedef struct _GstInputSelector GstInputSelector;
+typedef struct _GstInputSelectorClass GstInputSelectorClass;
+
+#define GST_INPUT_SELECTOR_GET_LOCK(sel) (((GstInputSelector*)(sel))->lock)
+#define GST_INPUT_SELECTOR_GET_COND(sel) (((GstInputSelector*)(sel))->cond)
+#define GST_INPUT_SELECTOR_LOCK(sel) (g_mutex_lock (GST_INPUT_SELECTOR_GET_LOCK(sel)))
+#define GST_INPUT_SELECTOR_UNLOCK(sel) (g_mutex_unlock (GST_INPUT_SELECTOR_GET_LOCK(sel)))
+#define GST_INPUT_SELECTOR_WAIT(sel) (g_cond_wait (GST_INPUT_SELECTOR_GET_COND(sel), \
+			GST_INPUT_SELECTOR_GET_LOCK(sel)))
+#define GST_INPUT_SELECTOR_BROADCAST(sel) (g_cond_broadcast (GST_INPUT_SELECTOR_GET_COND(sel)))
+
+struct _GstInputSelector {
+  GstElement element;
+
+  GstPad *srcpad;
+
+  GstPad *active_sinkpad;
+  guint n_pads;
+  guint padcount;
+
+  GstSegment segment;      /* the output segment */
+  gboolean pending_close;  /* if we should push a close first */
+
+  GMutex *lock;
+  GCond *cond;
+  gboolean blocked;
+  gboolean flushing;
+
+  /* select all mode, send data from all input pads forward */
+  gboolean select_all;
+};
+
+struct _GstInputSelectorClass {
+  GstElementClass parent_class;
+
+  gint64 (*block)	(GstInputSelector *self);
+  void (*switch_)	(GstInputSelector *self, GstPad *pad,
+                         gint64 stop_time, gint64 start_time);
+};
+
+GType gst_input_selector_get_type (void);
+
+G_END_DECLS
+
+#endif /* __GST_INPUT_SELECTOR_H__ */