gst/encoding/gststreamsplitter.c - imx-gst-plugins-base - Git at Google

 /* GStreamer Stream Splitter
  * Copyright (C) 2010 Edward Hervey <edward.hervey@collabora.co.uk>
  *           (C) 2009 Nokia Corporation
  *
  * 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., 51 Franklin St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include "gststreamsplitter.h"

 static GstStaticPadTemplate src_template =
 GST_STATIC_PAD_TEMPLATE ("src_%u", GST_PAD_SRC, GST_PAD_REQUEST,
     GST_STATIC_CAPS_ANY);

 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS_ANY);

 GST_DEBUG_CATEGORY_STATIC (gst_stream_splitter_debug);
 #define GST_CAT_DEFAULT gst_stream_splitter_debug

 G_DEFINE_TYPE (GstStreamSplitter, gst_stream_splitter, GST_TYPE_ELEMENT);

 #define STREAMS_LOCK(obj) (g_mutex_lock(&obj->lock))
 #define STREAMS_UNLOCK(obj) (g_mutex_unlock(&obj->lock))

 static void gst_stream_splitter_dispose (GObject * object);
 static void gst_stream_splitter_finalize (GObject * object);

 static gboolean gst_stream_splitter_sink_setcaps (GstPad * pad, GstCaps * caps);

 static GstPad *gst_stream_splitter_request_new_pad (GstElement * element,
     GstPadTemplate * templ, const gchar * name, const GstCaps * caps);
 static void gst_stream_splitter_release_pad (GstElement * element,
     GstPad * pad);

 static void
 gst_stream_splitter_class_init (GstStreamSplitterClass * klass)
 {
   GObjectClass *gobject_klass;
   GstElementClass *gstelement_klass;

   gobject_klass = (GObjectClass *) klass;
   gstelement_klass = (GstElementClass *) klass;

   gobject_klass->dispose = gst_stream_splitter_dispose;
   gobject_klass->finalize = gst_stream_splitter_finalize;

   GST_DEBUG_CATEGORY_INIT (gst_stream_splitter_debug, "streamsplitter", 0,
       "Stream Splitter");

   gst_element_class_add_static_pad_template (gstelement_klass, &src_template);
   gst_element_class_add_static_pad_template (gstelement_klass, &sink_template);

   gstelement_klass->request_new_pad =
       GST_DEBUG_FUNCPTR (gst_stream_splitter_request_new_pad);
   gstelement_klass->release_pad =
       GST_DEBUG_FUNCPTR (gst_stream_splitter_release_pad);

   gst_element_class_set_static_metadata (gstelement_klass,
       "streamsplitter", "Generic",
       "Splits streams based on their media type",
       "Edward Hervey <edward.hervey@collabora.co.uk>");
 }

 static void
 gst_stream_splitter_dispose (GObject * object)
 {
   GstStreamSplitter *stream_splitter = (GstStreamSplitter *) object;

   g_list_foreach (stream_splitter->pending_events, (GFunc) gst_event_unref,
       NULL);
   g_list_free (stream_splitter->pending_events);
   stream_splitter->pending_events = NULL;

   G_OBJECT_CLASS (gst_stream_splitter_parent_class)->dispose (object);
 }

 static void
 gst_stream_splitter_finalize (GObject * object)
 {
   GstStreamSplitter *stream_splitter = (GstStreamSplitter *) object;

   g_mutex_clear (&stream_splitter->lock);

   G_OBJECT_CLASS (gst_stream_splitter_parent_class)->finalize (object);
 }

 static void
 gst_stream_splitter_push_pending_events (GstStreamSplitter * splitter,
     GstPad * srcpad)
 {
   GList *tmp;
   GST_DEBUG_OBJECT (srcpad, "Pushing out pending events");

   for (tmp = splitter->pending_events; tmp; tmp = tmp->next) {
     GstEvent *event = (GstEvent *) tmp->data;
     gst_pad_push_event (srcpad, event);
   }
   g_list_free (splitter->pending_events);
   splitter->pending_events = NULL;
 }

 static GstFlowReturn
 gst_stream_splitter_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
 {
   GstStreamSplitter *stream_splitter = (GstStreamSplitter *) parent;
   GstFlowReturn res;
   GstPad *srcpad = NULL;

   STREAMS_LOCK (stream_splitter);
   if (stream_splitter->current)
     srcpad = gst_object_ref (stream_splitter->current);
   STREAMS_UNLOCK (stream_splitter);

   if (G_UNLIKELY (srcpad == NULL))
     goto nopad;

   if (G_UNLIKELY (stream_splitter->pending_events))
     gst_stream_splitter_push_pending_events (stream_splitter, srcpad);

   /* Forward to currently activated stream */
   res = gst_pad_push (srcpad, buf);
   gst_object_unref (srcpad);

   return res;

 nopad:
   GST_WARNING_OBJECT (stream_splitter, "No output pad was configured");
   return GST_FLOW_ERROR;
 }

 static GList *
 _flush_events (GstPad * pad, GList * events)
 {
   GList *tmp;

   for (tmp = events; tmp; tmp = tmp->next) {
     if (GST_EVENT_TYPE (tmp->data) != GST_EVENT_EOS &&
         GST_EVENT_TYPE (tmp->data) != GST_EVENT_SEGMENT &&
         GST_EVENT_IS_STICKY (tmp->data) && pad != NULL) {
       gst_pad_store_sticky_event (pad, GST_EVENT_CAST (tmp->data));
     }
     gst_event_unref (tmp->data);
   }
   g_list_free (events);

   return NULL;
 }

 static gboolean
 gst_stream_splitter_sink_event (GstPad * pad, GstObject * parent,
     GstEvent * event)
 {
   GstStreamSplitter *stream_splitter = (GstStreamSplitter *) parent;
   gboolean res = TRUE;
   gboolean toall = FALSE;
   gboolean store = FALSE;
   /* FLUSH_START/STOP : forward to all
    * INBAND events : store to send in chain function to selected chain
    * OUT_OF_BAND events : send to all
    */

   GST_DEBUG_OBJECT (stream_splitter, "Got event %s",
       GST_EVENT_TYPE_NAME (event));

   switch (GST_EVENT_TYPE (event)) {
     case GST_EVENT_CAPS:
     {
       GstCaps *caps;

       gst_event_parse_caps (event, &caps);
       res = gst_stream_splitter_sink_setcaps (pad, caps);

       store = TRUE;
       break;
     }
     case GST_EVENT_FLUSH_STOP:
       toall = TRUE;
       STREAMS_LOCK (stream_splitter);
       stream_splitter->pending_events = _flush_events (stream_splitter->current,
           stream_splitter->pending_events);
       STREAMS_UNLOCK (stream_splitter);
       break;
     case GST_EVENT_FLUSH_START:
       toall = TRUE;
       break;
     case GST_EVENT_EOS:

       if (G_UNLIKELY (stream_splitter->pending_events)) {
         GstPad *srcpad = NULL;

         STREAMS_LOCK (stream_splitter);
         if (stream_splitter->current)
           srcpad = gst_object_ref (stream_splitter->current);
         STREAMS_UNLOCK (stream_splitter);

         if (srcpad) {
           gst_stream_splitter_push_pending_events (stream_splitter, srcpad);
           gst_object_unref (srcpad);
         }
       }

       toall = TRUE;
       break;
     default:
       if (GST_EVENT_TYPE (event) & GST_EVENT_TYPE_SERIALIZED)
         store = TRUE;
   }

   if (store) {
     stream_splitter->pending_events =
         g_list_append (stream_splitter->pending_events, event);
   } else if (toall) {
     GList *tmp;
     guint32 cookie;

     /* Send to all pads */
     STREAMS_LOCK (stream_splitter);
   resync:
     if (G_UNLIKELY (stream_splitter->srcpads == NULL)) {
       STREAMS_UNLOCK (stream_splitter);
       /* No source pads */
       gst_event_unref (event);
       res = FALSE;
       goto beach;
     }
     tmp = stream_splitter->srcpads;
     cookie = stream_splitter->cookie;
     while (tmp) {
       GstPad *srcpad = (GstPad *) tmp->data;
       STREAMS_UNLOCK (stream_splitter);
       gst_event_ref (event);
       res = gst_pad_push_event (srcpad, event);
       STREAMS_LOCK (stream_splitter);
       if (G_UNLIKELY (cookie != stream_splitter->cookie))
         goto resync;
       tmp = tmp->next;
     }
     STREAMS_UNLOCK (stream_splitter);
     gst_event_unref (event);
   } else {
     GstPad *pad;

     /* Only send to current pad */

     STREAMS_LOCK (stream_splitter);
     pad = stream_splitter->current;
     STREAMS_UNLOCK (stream_splitter);
     if (pad)
       res = gst_pad_push_event (pad, event);
     else {
       gst_event_unref (event);
       res = FALSE;
     }
   }

 beach:
   return res;
 }

 static GstCaps *
 gst_stream_splitter_sink_getcaps (GstPad * pad, GstCaps * filter)
 {
   GstStreamSplitter *stream_splitter =
       (GstStreamSplitter *) GST_PAD_PARENT (pad);
   guint32 cookie;
   GList *tmp;
   GstCaps *res = NULL;

   /* Return the combination of all downstream caps */

   STREAMS_LOCK (stream_splitter);

 resync:
   if (G_UNLIKELY (stream_splitter->srcpads == NULL)) {
     res = (filter ? gst_caps_ref (filter) : gst_caps_new_any ());
     goto beach;
   }

   res = NULL;
   cookie = stream_splitter->cookie;
   tmp = stream_splitter->srcpads;

   while (tmp) {
     GstPad *srcpad = (GstPad *) tmp->data;

     /* Ensure srcpad doesn't get destroyed while we query peer */
     gst_object_ref (srcpad);
     STREAMS_UNLOCK (stream_splitter);
     if (res) {
       GstCaps *peercaps = gst_pad_peer_query_caps (srcpad, filter);
       if (peercaps)
         res = gst_caps_merge (res, peercaps);
     } else {
       res = gst_pad_peer_query_caps (srcpad, filter);
     }
     STREAMS_LOCK (stream_splitter);
     gst_object_unref (srcpad);

     if (G_UNLIKELY (cookie != stream_splitter->cookie)) {
       if (res)
         gst_caps_unref (res);
       goto resync;
     }
     tmp = tmp->next;
   }

 beach:
   STREAMS_UNLOCK (stream_splitter);
   return res;
 }

 static gboolean
 gst_stream_splitter_sink_acceptcaps (GstPad * pad, GstCaps * caps)
 {
   GstStreamSplitter *stream_splitter =
       (GstStreamSplitter *) GST_PAD_PARENT (pad);
   guint32 cookie;
   GList *tmp;
   gboolean res = FALSE;

   /* check if one of the downstream elements accepts the caps */
   STREAMS_LOCK (stream_splitter);

 resync:
   res = FALSE;

   if (G_UNLIKELY (stream_splitter->srcpads == NULL))
     goto beach;

   cookie = stream_splitter->cookie;
   tmp = stream_splitter->srcpads;

   while (tmp) {
     GstPad *srcpad = (GstPad *) tmp->data;

     /* Ensure srcpad doesn't get destroyed while we query peer */
     gst_object_ref (srcpad);
     STREAMS_UNLOCK (stream_splitter);

     res = gst_pad_peer_query_accept_caps (srcpad, caps);

     STREAMS_LOCK (stream_splitter);
     gst_object_unref (srcpad);

     if (G_UNLIKELY (cookie != stream_splitter->cookie))
       goto resync;

     if (res)
       break;

     tmp = tmp->next;
   }

 beach:
   STREAMS_UNLOCK (stream_splitter);
   return res;
 }

 static gboolean
 gst_stream_splitter_sink_query (GstPad * pad, GstObject * parent,
     GstQuery * query)
 {
   gboolean res;

   switch (GST_QUERY_TYPE (query)) {
     case GST_QUERY_CAPS:
     {
       GstCaps *filter, *caps;

       gst_query_parse_caps (query, &filter);
       caps = gst_stream_splitter_sink_getcaps (pad, filter);
       gst_query_set_caps_result (query, caps);
       gst_caps_unref (caps);
       res = TRUE;
       break;
     }
     case GST_QUERY_ACCEPT_CAPS:
     {
       GstCaps *caps;
       gboolean result;

       gst_query_parse_accept_caps (query, &caps);
       result = gst_stream_splitter_sink_acceptcaps (pad, caps);
       gst_query_set_accept_caps_result (query, result);
       res = TRUE;
       break;
     }
     default:
       res = gst_pad_query_default (pad, parent, query);
       break;
   }
   return res;
 }

 static gboolean
 gst_stream_splitter_sink_setcaps (GstPad * pad, GstCaps * caps)
 {
   GstStreamSplitter *stream_splitter =
       (GstStreamSplitter *) GST_PAD_PARENT (pad);
   guint32 cookie;
   GList *tmp;
   gboolean res;

   GST_DEBUG_OBJECT (stream_splitter, "caps %" GST_PTR_FORMAT, caps);

   /* Try on all pads, choose the one that succeeds as the current stream */
   STREAMS_LOCK (stream_splitter);

 resync:
   if (G_UNLIKELY (stream_splitter->srcpads == NULL)) {
     res = FALSE;
     goto beach;
   }

   res = FALSE;
   tmp = stream_splitter->srcpads;
   cookie = stream_splitter->cookie;

   while (tmp) {
     GstPad *srcpad = (GstPad *) tmp->data;
     GstCaps *peercaps;

     STREAMS_UNLOCK (stream_splitter);
     peercaps = gst_pad_peer_query_caps (srcpad, NULL);
     if (peercaps) {
       res = gst_caps_can_intersect (caps, peercaps);
       gst_caps_unref (peercaps);
     }
     STREAMS_LOCK (stream_splitter);

     if (G_UNLIKELY (cookie != stream_splitter->cookie))
       goto resync;

     if (res) {
       /* FIXME : we need to switch properly */
       GST_DEBUG_OBJECT (srcpad, "Setting caps on this pad was successful");
       stream_splitter->current = srcpad;
       goto beach;
     }
     tmp = tmp->next;
   }

 beach:
   STREAMS_UNLOCK (stream_splitter);
   return res;
 }

 static void
 gst_stream_splitter_init (GstStreamSplitter * stream_splitter)
 {
   stream_splitter->sinkpad =
       gst_pad_new_from_static_template (&sink_template, "sink");
   gst_pad_set_chain_function (stream_splitter->sinkpad,
       gst_stream_splitter_chain);
   gst_pad_set_event_function (stream_splitter->sinkpad,
       gst_stream_splitter_sink_event);
   gst_pad_set_query_function (stream_splitter->sinkpad,
       gst_stream_splitter_sink_query);
   gst_element_add_pad (GST_ELEMENT (stream_splitter), stream_splitter->sinkpad);

   g_mutex_init (&stream_splitter->lock);
 }

 static GstPad *
 gst_stream_splitter_request_new_pad (GstElement * element,
     GstPadTemplate * templ, const gchar * name, const GstCaps * caps)
 {
   GstStreamSplitter *stream_splitter = (GstStreamSplitter *) element;
   GstPad *srcpad;

   srcpad = gst_pad_new_from_static_template (&src_template, name);

   STREAMS_LOCK (stream_splitter);
   stream_splitter->srcpads = g_list_append (stream_splitter->srcpads, srcpad);
   gst_pad_set_active (srcpad, TRUE);
   gst_element_add_pad (element, srcpad);
   stream_splitter->cookie++;
   STREAMS_UNLOCK (stream_splitter);

   return srcpad;
 }

 static void
 gst_stream_splitter_release_pad (GstElement * element, GstPad * pad)
 {
   GstStreamSplitter *stream_splitter = (GstStreamSplitter *) element;
   GList *tmp;

   STREAMS_LOCK (stream_splitter);
   tmp = g_list_find (stream_splitter->srcpads, pad);
   if (tmp) {
     GstPad *pad = (GstPad *) tmp->data;

     stream_splitter->srcpads =
         g_list_delete_link (stream_splitter->srcpads, tmp);
     stream_splitter->cookie++;

     if (pad == stream_splitter->current) {
       /* Deactivate current flow */
       GST_DEBUG_OBJECT (element, "Removed pad was the current one");
       stream_splitter->current = NULL;
     }

     gst_element_remove_pad (element, pad);
   }
   STREAMS_UNLOCK (stream_splitter);

   return;
 }
	/* GStreamer Stream Splitter
	* Copyright (C) 2010 Edward Hervey <edward.hervey@collabora.co.uk>
	* (C) 2009 Nokia Corporation
	*
	* 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., 51 Franklin St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include "gststreamsplitter.h"

	static GstStaticPadTemplate src_template =
	GST_STATIC_PAD_TEMPLATE ("src_%u", GST_PAD_SRC, GST_PAD_REQUEST,
	GST_STATIC_CAPS_ANY);

	static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS_ANY);

	GST_DEBUG_CATEGORY_STATIC (gst_stream_splitter_debug);
	#define GST_CAT_DEFAULT gst_stream_splitter_debug

	G_DEFINE_TYPE (GstStreamSplitter, gst_stream_splitter, GST_TYPE_ELEMENT);

	#define STREAMS_LOCK(obj) (g_mutex_lock(&obj->lock))
	#define STREAMS_UNLOCK(obj) (g_mutex_unlock(&obj->lock))

	static void gst_stream_splitter_dispose (GObject * object);
	static void gst_stream_splitter_finalize (GObject * object);

	static gboolean gst_stream_splitter_sink_setcaps (GstPad * pad, GstCaps * caps);

	static GstPad gst_stream_splitter_request_new_pad (GstElement element,
	GstPadTemplate * templ, const gchar * name, const GstCaps * caps);
	static void gst_stream_splitter_release_pad (GstElement * element,
	GstPad * pad);

	static void
	gst_stream_splitter_class_init (GstStreamSplitterClass * klass)
	{
	GObjectClass *gobject_klass;
	GstElementClass *gstelement_klass;

	gobject_klass = (GObjectClass *) klass;
	gstelement_klass = (GstElementClass *) klass;

	gobject_klass->dispose = gst_stream_splitter_dispose;
	gobject_klass->finalize = gst_stream_splitter_finalize;

	GST_DEBUG_CATEGORY_INIT (gst_stream_splitter_debug, "streamsplitter", 0,
	"Stream Splitter");

	gst_element_class_add_static_pad_template (gstelement_klass, &src_template);
	gst_element_class_add_static_pad_template (gstelement_klass, &sink_template);

	gstelement_klass->request_new_pad =
	GST_DEBUG_FUNCPTR (gst_stream_splitter_request_new_pad);
	gstelement_klass->release_pad =
	GST_DEBUG_FUNCPTR (gst_stream_splitter_release_pad);

	gst_element_class_set_static_metadata (gstelement_klass,
	"streamsplitter", "Generic",
	"Splits streams based on their media type",
	"Edward Hervey <edward.hervey@collabora.co.uk>");
	}

	static void
	gst_stream_splitter_dispose (GObject * object)
	{
	GstStreamSplitter stream_splitter = (GstStreamSplitter ) object;

	g_list_foreach (stream_splitter->pending_events, (GFunc) gst_event_unref,
	NULL);
	g_list_free (stream_splitter->pending_events);
	stream_splitter->pending_events = NULL;

	G_OBJECT_CLASS (gst_stream_splitter_parent_class)->dispose (object);
	}

	static void
	gst_stream_splitter_finalize (GObject * object)
	{
	GstStreamSplitter stream_splitter = (GstStreamSplitter ) object;

	g_mutex_clear (&stream_splitter->lock);

	G_OBJECT_CLASS (gst_stream_splitter_parent_class)->finalize (object);
	}

	static void
	gst_stream_splitter_push_pending_events (GstStreamSplitter * splitter,
	GstPad * srcpad)
	{
	GList *tmp;
	GST_DEBUG_OBJECT (srcpad, "Pushing out pending events");

	for (tmp = splitter->pending_events; tmp; tmp = tmp->next) {
	GstEvent event = (GstEvent ) tmp->data;
	gst_pad_push_event (srcpad, event);
	}
	g_list_free (splitter->pending_events);
	splitter->pending_events = NULL;
	}

	static GstFlowReturn
	gst_stream_splitter_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
	{
	GstStreamSplitter stream_splitter = (GstStreamSplitter ) parent;
	GstFlowReturn res;
	GstPad *srcpad = NULL;

	STREAMS_LOCK (stream_splitter);
	if (stream_splitter->current)
	srcpad = gst_object_ref (stream_splitter->current);
	STREAMS_UNLOCK (stream_splitter);

	if (G_UNLIKELY (srcpad == NULL))
	goto nopad;

	if (G_UNLIKELY (stream_splitter->pending_events))
	gst_stream_splitter_push_pending_events (stream_splitter, srcpad);

	/* Forward to currently activated stream */
	res = gst_pad_push (srcpad, buf);
	gst_object_unref (srcpad);

	return res;

	nopad:
	GST_WARNING_OBJECT (stream_splitter, "No output pad was configured");
	return GST_FLOW_ERROR;
	}

	static GList *
	_flush_events (GstPad * pad, GList * events)
	{
	GList *tmp;

	for (tmp = events; tmp; tmp = tmp->next) {
	if (GST_EVENT_TYPE (tmp->data) != GST_EVENT_EOS &&
	GST_EVENT_TYPE (tmp->data) != GST_EVENT_SEGMENT &&
	GST_EVENT_IS_STICKY (tmp->data) && pad != NULL) {
	gst_pad_store_sticky_event (pad, GST_EVENT_CAST (tmp->data));
	}
	gst_event_unref (tmp->data);
	}
	g_list_free (events);

	return NULL;
	}

	static gboolean
	gst_stream_splitter_sink_event (GstPad * pad, GstObject * parent,
	GstEvent * event)
	{
	GstStreamSplitter stream_splitter = (GstStreamSplitter ) parent;
	gboolean res = TRUE;
	gboolean toall = FALSE;
	gboolean store = FALSE;
	/* FLUSH_START/STOP : forward to all
	* INBAND events : store to send in chain function to selected chain
	* OUT_OF_BAND events : send to all
	*/

	GST_DEBUG_OBJECT (stream_splitter, "Got event %s",
	GST_EVENT_TYPE_NAME (event));

	switch (GST_EVENT_TYPE (event)) {
	case GST_EVENT_CAPS:
	{
	GstCaps *caps;

	gst_event_parse_caps (event, &caps);
	res = gst_stream_splitter_sink_setcaps (pad, caps);

	store = TRUE;
	break;
	}
	case GST_EVENT_FLUSH_STOP:
	toall = TRUE;
	STREAMS_LOCK (stream_splitter);
	stream_splitter->pending_events = _flush_events (stream_splitter->current,
	stream_splitter->pending_events);
	STREAMS_UNLOCK (stream_splitter);
	break;
	case GST_EVENT_FLUSH_START:
	toall = TRUE;
	break;
	case GST_EVENT_EOS:

	if (G_UNLIKELY (stream_splitter->pending_events)) {
	GstPad *srcpad = NULL;

	STREAMS_LOCK (stream_splitter);
	if (stream_splitter->current)
	srcpad = gst_object_ref (stream_splitter->current);
	STREAMS_UNLOCK (stream_splitter);

	if (srcpad) {
	gst_stream_splitter_push_pending_events (stream_splitter, srcpad);
	gst_object_unref (srcpad);
	}
	}

	toall = TRUE;
	break;
	default:
	if (GST_EVENT_TYPE (event) & GST_EVENT_TYPE_SERIALIZED)
	store = TRUE;
	}

	if (store) {
	stream_splitter->pending_events =
	g_list_append (stream_splitter->pending_events, event);
	} else if (toall) {
	GList *tmp;
	guint32 cookie;

	/* Send to all pads */
	STREAMS_LOCK (stream_splitter);
	resync:
	if (G_UNLIKELY (stream_splitter->srcpads == NULL)) {
	STREAMS_UNLOCK (stream_splitter);
	/* No source pads */
	gst_event_unref (event);
	res = FALSE;
	goto beach;
	}
	tmp = stream_splitter->srcpads;
	cookie = stream_splitter->cookie;
	while (tmp) {
	GstPad srcpad = (GstPad ) tmp->data;
	STREAMS_UNLOCK (stream_splitter);
	gst_event_ref (event);
	res = gst_pad_push_event (srcpad, event);
	STREAMS_LOCK (stream_splitter);
	if (G_UNLIKELY (cookie != stream_splitter->cookie))
	goto resync;
	tmp = tmp->next;
	}
	STREAMS_UNLOCK (stream_splitter);
	gst_event_unref (event);
	} else {
	GstPad *pad;

	/* Only send to current pad */

	STREAMS_LOCK (stream_splitter);
	pad = stream_splitter->current;
	STREAMS_UNLOCK (stream_splitter);
	if (pad)
	res = gst_pad_push_event (pad, event);
	else {
	gst_event_unref (event);
	res = FALSE;
	}
	}

	beach:
	return res;
	}

	static GstCaps *
	gst_stream_splitter_sink_getcaps (GstPad * pad, GstCaps * filter)
	{
	GstStreamSplitter *stream_splitter =
	(GstStreamSplitter *) GST_PAD_PARENT (pad);
	guint32 cookie;
	GList *tmp;
	GstCaps *res = NULL;

	/* Return the combination of all downstream caps */

	STREAMS_LOCK (stream_splitter);

	resync:
	if (G_UNLIKELY (stream_splitter->srcpads == NULL)) {
	res = (filter ? gst_caps_ref (filter) : gst_caps_new_any ());
	goto beach;
	}

	res = NULL;
	cookie = stream_splitter->cookie;
	tmp = stream_splitter->srcpads;

	while (tmp) {
	GstPad srcpad = (GstPad ) tmp->data;

	/* Ensure srcpad doesn't get destroyed while we query peer */
	gst_object_ref (srcpad);
	STREAMS_UNLOCK (stream_splitter);
	if (res) {
	GstCaps *peercaps = gst_pad_peer_query_caps (srcpad, filter);
	if (peercaps)
	res = gst_caps_merge (res, peercaps);
	} else {
	res = gst_pad_peer_query_caps (srcpad, filter);
	}
	STREAMS_LOCK (stream_splitter);
	gst_object_unref (srcpad);

	if (G_UNLIKELY (cookie != stream_splitter->cookie)) {
	if (res)
	gst_caps_unref (res);
	goto resync;
	}
	tmp = tmp->next;
	}

	beach:
	STREAMS_UNLOCK (stream_splitter);
	return res;
	}

	static gboolean
	gst_stream_splitter_sink_acceptcaps (GstPad * pad, GstCaps * caps)
	{
	GstStreamSplitter *stream_splitter =
	(GstStreamSplitter *) GST_PAD_PARENT (pad);
	guint32 cookie;
	GList *tmp;
	gboolean res = FALSE;

	/* check if one of the downstream elements accepts the caps */
	STREAMS_LOCK (stream_splitter);

	resync:
	res = FALSE;

	if (G_UNLIKELY (stream_splitter->srcpads == NULL))
	goto beach;

	cookie = stream_splitter->cookie;
	tmp = stream_splitter->srcpads;

	while (tmp) {
	GstPad srcpad = (GstPad ) tmp->data;

	/* Ensure srcpad doesn't get destroyed while we query peer */
	gst_object_ref (srcpad);
	STREAMS_UNLOCK (stream_splitter);

	res = gst_pad_peer_query_accept_caps (srcpad, caps);

	STREAMS_LOCK (stream_splitter);
	gst_object_unref (srcpad);

	if (G_UNLIKELY (cookie != stream_splitter->cookie))
	goto resync;

	if (res)
	break;

	tmp = tmp->next;
	}

	beach:
	STREAMS_UNLOCK (stream_splitter);
	return res;
	}

	static gboolean
	gst_stream_splitter_sink_query (GstPad * pad, GstObject * parent,
	GstQuery * query)
	{
	gboolean res;

	switch (GST_QUERY_TYPE (query)) {
	case GST_QUERY_CAPS:
	{
	GstCaps filter, caps;

	gst_query_parse_caps (query, &filter);
	caps = gst_stream_splitter_sink_getcaps (pad, filter);
	gst_query_set_caps_result (query, caps);
	gst_caps_unref (caps);
	res = TRUE;
	break;
	}
	case GST_QUERY_ACCEPT_CAPS:
	{
	GstCaps *caps;
	gboolean result;

	gst_query_parse_accept_caps (query, &caps);
	result = gst_stream_splitter_sink_acceptcaps (pad, caps);
	gst_query_set_accept_caps_result (query, result);
	res = TRUE;
	break;
	}
	default:
	res = gst_pad_query_default (pad, parent, query);
	break;
	}
	return res;
	}

	static gboolean
	gst_stream_splitter_sink_setcaps (GstPad * pad, GstCaps * caps)
	{
	GstStreamSplitter *stream_splitter =
	(GstStreamSplitter *) GST_PAD_PARENT (pad);
	guint32 cookie;
	GList *tmp;
	gboolean res;

	GST_DEBUG_OBJECT (stream_splitter, "caps %" GST_PTR_FORMAT, caps);

	/* Try on all pads, choose the one that succeeds as the current stream */
	STREAMS_LOCK (stream_splitter);

	resync:
	if (G_UNLIKELY (stream_splitter->srcpads == NULL)) {
	res = FALSE;
	goto beach;
	}

	res = FALSE;
	tmp = stream_splitter->srcpads;
	cookie = stream_splitter->cookie;

	while (tmp) {
	GstPad srcpad = (GstPad ) tmp->data;
	GstCaps *peercaps;

	STREAMS_UNLOCK (stream_splitter);
	peercaps = gst_pad_peer_query_caps (srcpad, NULL);
	if (peercaps) {
	res = gst_caps_can_intersect (caps, peercaps);
	gst_caps_unref (peercaps);
	}
	STREAMS_LOCK (stream_splitter);

	if (G_UNLIKELY (cookie != stream_splitter->cookie))
	goto resync;

	if (res) {
	/* FIXME : we need to switch properly */
	GST_DEBUG_OBJECT (srcpad, "Setting caps on this pad was successful");
	stream_splitter->current = srcpad;
	goto beach;
	}
	tmp = tmp->next;
	}

	beach:
	STREAMS_UNLOCK (stream_splitter);
	return res;
	}

	static void
	gst_stream_splitter_init (GstStreamSplitter * stream_splitter)
	{
	stream_splitter->sinkpad =
	gst_pad_new_from_static_template (&sink_template, "sink");
	gst_pad_set_chain_function (stream_splitter->sinkpad,
	gst_stream_splitter_chain);
	gst_pad_set_event_function (stream_splitter->sinkpad,
	gst_stream_splitter_sink_event);
	gst_pad_set_query_function (stream_splitter->sinkpad,
	gst_stream_splitter_sink_query);
	gst_element_add_pad (GST_ELEMENT (stream_splitter), stream_splitter->sinkpad);

	g_mutex_init (&stream_splitter->lock);
	}

	static GstPad *
	gst_stream_splitter_request_new_pad (GstElement * element,
	GstPadTemplate * templ, const gchar * name, const GstCaps * caps)
	{
	GstStreamSplitter stream_splitter = (GstStreamSplitter ) element;
	GstPad *srcpad;

	srcpad = gst_pad_new_from_static_template (&src_template, name);

	STREAMS_LOCK (stream_splitter);
	stream_splitter->srcpads = g_list_append (stream_splitter->srcpads, srcpad);
	gst_pad_set_active (srcpad, TRUE);
	gst_element_add_pad (element, srcpad);
	stream_splitter->cookie++;
	STREAMS_UNLOCK (stream_splitter);

	return srcpad;
	}

	static void
	gst_stream_splitter_release_pad (GstElement * element, GstPad * pad)
	{
	GstStreamSplitter stream_splitter = (GstStreamSplitter ) element;
	GList *tmp;

	STREAMS_LOCK (stream_splitter);
	tmp = g_list_find (stream_splitter->srcpads, pad);
	if (tmp) {
	GstPad pad = (GstPad ) tmp->data;

	stream_splitter->srcpads =
	g_list_delete_link (stream_splitter->srcpads, tmp);
	stream_splitter->cookie++;

	if (pad == stream_splitter->current) {
	/* Deactivate current flow */
	GST_DEBUG_OBJECT (element, "Removed pad was the current one");
	stream_splitter->current = NULL;
	}

	gst_element_remove_pad (element, pad);
	}
	STREAMS_UNLOCK (stream_splitter);

	return;
	}