configure.ac: Check for libdvdnav to build resindvd.

Original commit message from CVS:
* configure.ac:
Check for libdvdnav to build resindvd.
* ext/Makefile.am:
* ext/resindvd/Makefile.am:
* ext/resindvd/gstmpegdefs.h:
* ext/resindvd/gstmpegdemux.c:
* ext/resindvd/gstmpegdemux.h:
* ext/resindvd/gstmpegdesc.c:
* ext/resindvd/gstmpegdesc.h:
* ext/resindvd/gstpesfilter.c:
* ext/resindvd/gstpesfilter.h:
* ext/resindvd/plugin.c:
* ext/resindvd/resin-play:
* ext/resindvd/resindvdbin.c:
* ext/resindvd/resindvdbin.h:
* ext/resindvd/resindvdsrc.c:
* ext/resindvd/resindvdsrc.h:
* ext/resindvd/rsnaudiomunge.c:
* ext/resindvd/rsnaudiomunge.h:
* ext/resindvd/rsnbasesrc.c:
* ext/resindvd/rsnbasesrc.h:
* ext/resindvd/rsnpushsrc.c:
* ext/resindvd/rsnpushsrc.h:
* ext/resindvd/rsnstreamselector.c:
* ext/resindvd/rsnstreamselector.h:
First commit of DVD-Video playback component 'rsndvdbin'
and helper elements.
Use --enable-experimental for now, but feel free to give it a
try using the resin-play script.
* gst/dvdspu/gstdvdspu.c:
Add some extra guards for malformed events.

1 files changed, 784 insertions, 0 deletions

diff --git a/ext/resindvd/rsnstreamselector.c b/ext/resindvd/rsnstreamselector.c
new file mode 100644
index 00000000..b422ac38
--- /dev/null
+++ b/ext/resindvd/rsnstreamselector.c
@@ -0,0 +1,784 @@
+/* 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>
+ *
+ * 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 "rsnstreamselector.h"
+
+GST_DEBUG_CATEGORY_STATIC (stream_selector_debug);
+#define GST_CAT_DEFAULT stream_selector_debug
+
+static const GstElementDetails rsn_stream_selector_details =
+GST_ELEMENT_DETAILS ("StreamSelector",
+    "Generic",
+    "N-to-1 input stream_selectoring",
+    "Julien Moutte <julien@moutte.net>\n"
+    "Ronald S. Bultje <rbultje@ronald.bitfreak.net>\n"
+    "Jan Schmidt <thaytan@mad.scientist.com>\n"
+    "Wim Taymans <wim.taymans@gmail.com>");
+
+static GstStaticPadTemplate rsn_stream_selector_sink_factory =
+GST_STATIC_PAD_TEMPLATE ("sink%d",
+    GST_PAD_SINK,
+    GST_PAD_REQUEST,
+    GST_STATIC_CAPS_ANY);
+
+static GstStaticPadTemplate rsn_stream_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_LAST
+};
+
+static gboolean rsn_stream_selector_is_active_sinkpad (RsnStreamSelector * sel,
+    GstPad * pad);
+static GstPad *rsn_stream_selector_activate_sinkpad (RsnStreamSelector * sel,
+    GstPad * pad);
+static GstPad *rsn_stream_selector_get_linked_pad (GstPad * pad,
+    gboolean strict);
+
+#define RSN_TYPE_SELECTOR_PAD \
+  (gst_selector_pad_get_type())
+#define GST_SELECTOR_PAD(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), RSN_TYPE_SELECTOR_PAD, RsnSelectorPad))
+#define GST_SELECTOR_PAD_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), RSN_TYPE_SELECTOR_PAD, RsnSelectorPadClass))
+#define RSN_IS_SELECTOR_PAD(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), RSN_TYPE_SELECTOR_PAD))
+#define RSN_IS_SELECTOR_PAD_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), RSN_TYPE_SELECTOR_PAD))
+#define GST_SELECTOR_PAD_CAST(obj) \
+  ((RsnSelectorPad *)(obj))
+
+typedef struct _RsnSelectorPad RsnSelectorPad;
+typedef struct _RsnSelectorPadClass RsnSelectorPadClass;
+
+struct _RsnSelectorPad
+{
+  GstPad parent;
+
+  gboolean active;
+  gboolean eos;
+  gboolean segment_pending;
+  GstSegment segment;
+  GstTagList *tags;
+};
+
+struct _RsnSelectorPadClass
+{
+  GstPadClass parent;
+};
+
+static void gst_selector_pad_class_init (RsnSelectorPadClass * klass);
+static void gst_selector_pad_init (RsnSelectorPad * 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 GstPadClass *selector_pad_parent_class = NULL;
+
+static void gst_selector_pad_reset (RsnSelectorPad * pad);
+static gboolean gst_selector_pad_event (GstPad * pad, GstEvent * event);
+static GstCaps *gst_selector_pad_getcaps (GstPad * pad);
+static GList *gst_selector_pad_get_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);
+
+enum
+{
+  PROP_PAD_0,
+  PROP_PAD_TAGS,
+  PROP_PAD_ACTIVE,
+  PROP_PAD_LAST
+};
+
+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 (RsnSelectorPadClass),
+      NULL,
+      NULL,
+      (GClassInitFunc) gst_selector_pad_class_init,
+      NULL,
+      NULL,
+      sizeof (RsnSelectorPad),
+      0,
+      (GInstanceInitFunc) gst_selector_pad_init,
+    };
+
+    selector_pad_type =
+        g_type_register_static (GST_TYPE_PAD, "RsnSelectorPad",
+        &selector_pad_info, 0);
+  }
+  return selector_pad_type;
+}
+
+static void
+gst_selector_pad_class_init (RsnSelectorPadClass * 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_DEBUG_FUNCPTR (gst_selector_pad_get_property);
+
+  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));
+}
+
+static void
+gst_selector_pad_init (RsnSelectorPad * pad)
+{
+  gst_selector_pad_reset (pad);
+}
+
+static void
+gst_selector_pad_finalize (GObject * object)
+{
+  RsnSelectorPad *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_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  RsnSelectorPad *pad;
+
+  pad = GST_SELECTOR_PAD (object);
+
+  switch (prop_id) {
+    case PROP_PAD_TAGS:
+      GST_OBJECT_LOCK (object);
+      g_value_set_boxed (value, pad->tags);
+      GST_OBJECT_UNLOCK (object);
+      break;
+    case PROP_PAD_ACTIVE:
+    {
+      RsnStreamSelector *sel;
+
+      sel = RSN_STREAM_SELECTOR (gst_pad_get_parent (pad));
+      g_value_set_boolean (value, rsn_stream_selector_is_active_sinkpad (sel,
+              GST_PAD_CAST (pad)));
+      gst_object_unref (sel);
+      break;
+    }
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_selector_pad_reset (RsnSelectorPad * pad)
+{
+  pad->active = FALSE;
+  pad->eos = FALSE;
+  gst_segment_init (&pad->segment, GST_FORMAT_UNDEFINED);
+}
+
+/* strictly get the linked pad from the sinkpad. If the pad is active we return
+ * the srcpad else we return NULL */
+static GList *
+gst_selector_pad_get_linked_pads (GstPad * pad)
+{
+  GstPad *otherpad;
+
+  otherpad = rsn_stream_selector_get_linked_pad (pad, TRUE);
+  if (!otherpad)
+    return NULL;
+
+  /* need to drop the ref, internal linked pads is not MT safe */
+  gst_object_unref (otherpad);
+
+  return g_list_append (NULL, otherpad);
+}
+
+static gboolean
+gst_selector_pad_event (GstPad * pad, GstEvent * event)
+{
+  gboolean res = TRUE;
+  gboolean forward = TRUE;
+  RsnStreamSelector *sel;
+  RsnSelectorPad *selpad;
+  GstPad *active_sinkpad;
+
+  sel = RSN_STREAM_SELECTOR (gst_pad_get_parent (pad));
+  selpad = GST_SELECTOR_PAD_CAST (pad);
+
+  /* only forward if we are dealing with the active sinkpad */
+  active_sinkpad = rsn_stream_selector_activate_sinkpad (sel, pad);
+  forward = (active_sinkpad == pad);
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_FLUSH_STOP:
+      gst_selector_pad_reset (selpad);
+      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 (selpad,
+          "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_segment_set_newsegment_full (&selpad->segment, update,
+          rate, arate, format, start, stop, time);
+      /* if we are not going to forward the segment, mark the segment as
+       * pending */
+      if (!forward)
+        selpad->segment_pending = TRUE;
+      break;
+    }
+    case GST_EVENT_TAG:
+    {
+      GstTagList *tags;
+
+      GST_OBJECT_LOCK (selpad);
+      if (selpad->tags)
+        gst_tag_list_free (selpad->tags);
+      gst_event_parse_tag (event, &tags);
+      if (tags)
+        tags = gst_tag_list_copy (tags);
+      selpad->tags = tags;
+      GST_DEBUG_OBJECT (sel, "received tags %" GST_PTR_FORMAT, selpad->tags);
+      GST_OBJECT_UNLOCK (selpad);
+      break;
+    }
+    case GST_EVENT_EOS:
+      selpad->eos = TRUE;
+      break;
+    default:
+      break;
+  }
+  if (forward)
+    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)
+{
+  RsnStreamSelector *sel;
+  GstCaps *caps;
+
+  sel = RSN_STREAM_SELECTOR (gst_pad_get_parent (pad));
+
+  GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer");
+  caps = gst_pad_peer_get_caps (sel->srcpad);
+  if (caps == NULL)
+    caps = gst_caps_new_any ();
+
+  gst_object_unref (sel);
+
+  return caps;
+}
+
+static GstFlowReturn
+gst_selector_pad_bufferalloc (GstPad * pad, guint64 offset,
+    guint size, GstCaps * caps, GstBuffer ** buf)
+{
+  RsnStreamSelector *sel;
+  GstFlowReturn result;
+  GstPad *active_sinkpad;
+
+  sel = RSN_STREAM_SELECTOR (gst_pad_get_parent (pad));
+
+  active_sinkpad = rsn_stream_selector_activate_sinkpad (sel, pad);
+
+  /* Fallback allocation for buffers from pads except the selected one */
+  if (pad != active_sinkpad) {
+    GST_DEBUG_OBJECT (sel,
+        "Pad %s:%s is not selected. Performing fallback allocation",
+        GST_DEBUG_PAD_NAME (pad));
+
+    *buf = NULL;
+    result = GST_FLOW_OK;
+  } else {
+    result = gst_pad_alloc_buffer (sel->srcpad, offset, size, caps, buf);
+
+    /* FIXME: HACK. If buffer alloc returns not-linked, perform a fallback
+     * allocation.  This should NOT be necessary, because playbin should
+     * properly block the source pad from running until it's finished hooking 
+     * everything up, but playbin needs refactoring first. */
+    if (result == GST_FLOW_NOT_LINKED) {
+      GST_DEBUG_OBJECT (sel,
+          "No peer pad yet - performing fallback allocation for pad %s:%s",
+          GST_DEBUG_PAD_NAME (pad));
+
+      *buf = NULL;
+      result = GST_FLOW_OK;
+    }
+  }
+
+  gst_object_unref (sel);
+
+  return result;
+}
+
+static GstFlowReturn
+gst_selector_pad_chain (GstPad * pad, GstBuffer * buf)
+{
+  RsnStreamSelector *sel;
+  GstFlowReturn res;
+  GstPad *active_sinkpad;
+  RsnSelectorPad *selpad;
+  GstClockTime timestamp;
+  GstSegment *seg;
+
+  sel = RSN_STREAM_SELECTOR (gst_pad_get_parent (pad));
+  selpad = GST_SELECTOR_PAD_CAST (pad);
+  seg = &selpad->segment;
+
+  active_sinkpad = rsn_stream_selector_activate_sinkpad (sel, pad);
+
+  timestamp = GST_BUFFER_TIMESTAMP (buf);
+  if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
+    GST_DEBUG_OBJECT (sel, "received timestamp %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (timestamp));
+    gst_segment_set_last_stop (seg, seg->format, timestamp);
+  }
+
+  /* Ignore buffers from pads except the selected one */
+  if (pad != active_sinkpad)
+    goto ignore;
+
+  /* if we have a pending segment, push it out now */
+  if (selpad->segment_pending) {
+    gst_pad_push_event (sel->srcpad, gst_event_new_new_segment_full (FALSE,
+            seg->rate, seg->applied_rate, seg->format, seg->start, seg->stop,
+            seg->time));
+
+    selpad->segment_pending = FALSE;
+  }
+
+  /* forward */
+  GST_DEBUG_OBJECT (sel, "Forwarding buffer %p from pad %s:%s", buf,
+      GST_DEBUG_PAD_NAME (pad));
+  res = gst_pad_push (sel->srcpad, buf);
+done:
+  gst_object_unref (sel);
+  return res;
+  /* dropped buffers */
+ignore:
+  {
+    GST_DEBUG_OBJECT (sel, "Ignoring buffer %p from pad %s:%s",
+        buf, GST_DEBUG_PAD_NAME (pad));
+    gst_buffer_unref (buf);
+    res = GST_FLOW_NOT_LINKED;
+    goto done;
+  }
+}
+
+static void rsn_stream_selector_dispose (GObject * object);
+static void rsn_stream_selector_finalize (GObject * object);
+
+static void rsn_stream_selector_init (RsnStreamSelector * sel);
+static void rsn_stream_selector_base_init (RsnStreamSelectorClass * klass);
+static void rsn_stream_selector_class_init (RsnStreamSelectorClass * klass);
+
+static void rsn_stream_selector_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec);
+static void rsn_stream_selector_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec);
+
+static GstPad *rsn_stream_selector_request_new_pad (GstElement * element,
+    GstPadTemplate * templ, const gchar * unused);
+static void rsn_stream_selector_release_pad (GstElement * element,
+    GstPad * pad);
+static GList *rsn_stream_selector_get_linked_pads (GstPad * pad);
+static GstCaps *rsn_stream_selector_getcaps (GstPad * pad);
+
+static GstElementClass *parent_class = NULL;
+
+GType
+rsn_stream_selector_get_type (void)
+{
+  static GType stream_selector_type = 0;
+
+  if (!stream_selector_type) {
+    static const GTypeInfo stream_selector_info = {
+      sizeof (RsnStreamSelectorClass),
+      (GBaseInitFunc) rsn_stream_selector_base_init,
+      NULL,
+      (GClassInitFunc) rsn_stream_selector_class_init,
+      NULL,
+      NULL,
+      sizeof (RsnStreamSelector),
+      0,
+      (GInstanceInitFunc) rsn_stream_selector_init,
+    };
+    stream_selector_type =
+        g_type_register_static (GST_TYPE_ELEMENT,
+        "RsnStreamSelector", &stream_selector_info, 0);
+    GST_DEBUG_CATEGORY_INIT (stream_selector_debug,
+        "streamselector", 0, "A stream-selector element");
+  }
+
+  return stream_selector_type;
+}
+
+static void
+rsn_stream_selector_base_init (RsnStreamSelectorClass * klass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  gst_element_class_set_details (element_class, &rsn_stream_selector_details);
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&rsn_stream_selector_sink_factory));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&rsn_stream_selector_src_factory));
+}
+
+static void
+rsn_stream_selector_class_init (RsnStreamSelectorClass * klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
+
+  parent_class = g_type_class_peek_parent (klass);
+
+  gobject_class->dispose = rsn_stream_selector_dispose;
+  gobject_class->finalize = rsn_stream_selector_finalize;
+
+  gobject_class->set_property =
+      GST_DEBUG_FUNCPTR (rsn_stream_selector_set_property);
+  gobject_class->get_property =
+      GST_DEBUG_FUNCPTR (rsn_stream_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));
+
+  gstelement_class->request_new_pad = rsn_stream_selector_request_new_pad;
+  gstelement_class->release_pad = rsn_stream_selector_release_pad;
+}
+
+static void
+rsn_stream_selector_init (RsnStreamSelector * sel)
+{
+  sel->srcpad = gst_pad_new ("src", GST_PAD_SRC);
+  gst_pad_set_internal_link_function (sel->srcpad,
+      GST_DEBUG_FUNCPTR (rsn_stream_selector_get_linked_pads));
+  gst_pad_set_getcaps_function (sel->srcpad,
+      GST_DEBUG_FUNCPTR (rsn_stream_selector_getcaps));
+  gst_element_add_pad (GST_ELEMENT (sel), sel->srcpad);
+  /* sinkpad management */
+  sel->padcount = 0;
+  sel->active_sinkpad = NULL;
+  gst_segment_init (&sel->segment, GST_FORMAT_UNDEFINED);
+}
+
+static void
+rsn_stream_selector_dispose (GObject * object)
+{
+  RsnStreamSelector *sel = RSN_STREAM_SELECTOR (object);
+
+  if (sel->active_sinkpad) {
+    gst_object_unref (sel->active_sinkpad);
+    sel->active_sinkpad = NULL;
+  }
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+rsn_stream_selector_finalize (GObject * object)
+{
+  RsnStreamSelector *sel;
+
+  sel = RSN_STREAM_SELECTOR (object);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+rsn_stream_selector_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  RsnStreamSelector *sel = RSN_STREAM_SELECTOR (object);
+
+  switch (prop_id) {
+    case PROP_ACTIVE_PAD:
+    {
+      GstPad *pad = NULL;
+      GstPad **active_pad_p;
+
+      pad = g_value_get_object (value);
+
+      GST_OBJECT_LOCK (object);
+      if (pad != sel->active_sinkpad) {
+        RsnSelectorPad *selpad;
+
+        selpad = GST_SELECTOR_PAD_CAST (pad);
+        /* we can only activate pads that have data received */
+        if (selpad && !selpad->active) {
+          GST_DEBUG_OBJECT (sel, "No data received on pad %" GST_PTR_FORMAT,
+              pad);
+        } else {
+          active_pad_p = &sel->active_sinkpad;
+          gst_object_replace ((GstObject **) active_pad_p,
+              GST_OBJECT_CAST (pad));
+          GST_DEBUG_OBJECT (sel, "New active pad is %" GST_PTR_FORMAT,
+              sel->active_sinkpad);
+        }
+      }
+      GST_OBJECT_UNLOCK (object);
+      break;
+    }
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+rsn_stream_selector_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  RsnStreamSelector *sel = RSN_STREAM_SELECTOR (object);
+
+  switch (prop_id) {
+    case PROP_N_PADS:
+      GST_OBJECT_LOCK (object);
+      g_value_set_uint (value, sel->n_pads);
+      GST_OBJECT_UNLOCK (object);
+      break;
+    case PROP_ACTIVE_PAD:{
+      GST_OBJECT_LOCK (object);
+      g_value_set_object (value, sel->active_sinkpad);
+      GST_OBJECT_UNLOCK (object);
+      break;
+    }
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static GstPad *
+rsn_stream_selector_get_linked_pad (GstPad * pad, gboolean strict)
+{
+  RsnStreamSelector *sel;
+  GstPad *otherpad = NULL;
+
+  sel = RSN_STREAM_SELECTOR (gst_pad_get_parent (pad));
+
+  GST_OBJECT_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_OBJECT_UNLOCK (sel);
+  gst_object_unref (sel);
+  return otherpad;
+}
+
+static GstCaps *
+rsn_stream_selector_getcaps (GstPad * pad)
+{
+  GstPad *otherpad;
+  GstObject *parent;
+  GstCaps *caps;
+
+  otherpad = rsn_stream_selector_get_linked_pad (pad, FALSE);
+  parent = gst_object_get_parent (GST_OBJECT (pad));
+  if (!otherpad) {
+    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 (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
+rsn_stream_selector_is_active_sinkpad (RsnStreamSelector * sel, GstPad * pad)
+{
+  RsnSelectorPad *selpad;
+  gboolean res;
+
+  selpad = GST_SELECTOR_PAD_CAST (pad);
+
+  GST_OBJECT_LOCK (sel);
+  res = (pad == sel->active_sinkpad);
+  GST_OBJECT_UNLOCK (sel);
+
+  return res;
+}
+
+/* Get or create the active sinkpad */
+static GstPad *
+rsn_stream_selector_activate_sinkpad (RsnStreamSelector * sel, GstPad * pad)
+{
+  GstPad *active_sinkpad;
+  RsnSelectorPad *selpad;
+
+  selpad = GST_SELECTOR_PAD_CAST (pad);
+
+  GST_OBJECT_LOCK (sel);
+  selpad->active = TRUE;
+  active_sinkpad = sel->active_sinkpad;
+  if (active_sinkpad == NULL) {
+    /* first pad we get an alloc on becomes the activated pad by default */
+    active_sinkpad = sel->active_sinkpad = gst_object_ref (pad);
+    GST_DEBUG_OBJECT (sel, "Activating pad %s:%s", GST_DEBUG_PAD_NAME (pad));
+  }
+  GST_OBJECT_UNLOCK (sel);
+
+  return active_sinkpad;
+}
+
+static GList *
+rsn_stream_selector_get_linked_pads (GstPad * pad)
+{
+  GstPad *otherpad;
+
+  otherpad = rsn_stream_selector_get_linked_pad (pad, TRUE);
+  if (!otherpad)
+    return NULL;
+  /* need to drop the ref, internal linked pads is not MT safe */
+  gst_object_unref (otherpad);
+  return g_list_append (NULL, otherpad);
+}
+
+static GstPad *
+rsn_stream_selector_request_new_pad (GstElement * element,
+    GstPadTemplate * templ, const gchar * unused)
+{
+  RsnStreamSelector *sel;
+  gchar *name = NULL;
+  GstPad *sinkpad = NULL;
+
+  sel = RSN_STREAM_SELECTOR (element);
+  g_return_val_if_fail (templ->direction == GST_PAD_SINK, NULL);
+  GST_LOG_OBJECT (sel, "Creating new pad %d", sel->padcount);
+  GST_OBJECT_LOCK (sel);
+  name = g_strdup_printf ("sink%d", sel->padcount++);
+  sinkpad = g_object_new (RSN_TYPE_SELECTOR_PAD,
+      "name", name, "direction", templ->direction, "template", templ, NULL);
+  g_free (name);
+  sel->n_pads++;
+  GST_OBJECT_UNLOCK (sel);
+
+  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_chain_function (sinkpad,
+      GST_DEBUG_FUNCPTR (gst_selector_pad_chain));
+  gst_pad_set_internal_link_function (sinkpad,
+      GST_DEBUG_FUNCPTR (gst_selector_pad_get_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);
+  return sinkpad;
+}
+
+static void
+rsn_stream_selector_release_pad (GstElement * element, GstPad * pad)
+{
+  RsnStreamSelector *sel;
+
+  sel = RSN_STREAM_SELECTOR (element);
+  GST_LOG_OBJECT (sel, "Releasing pad %s:%s", GST_DEBUG_PAD_NAME (pad));
+
+  GST_OBJECT_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));
+    sel->active_sinkpad = NULL;
+  }
+  sel->n_pads--;
+  GST_OBJECT_UNLOCK (sel);
+
+  gst_pad_set_active (pad, FALSE);
+  gst_element_remove_pad (GST_ELEMENT (sel), pad);
+}