gstreamer/tests/check/gst/gstghostpad.c

/* GStreamer
 * Copyright (C) 2005 Wim Taymans <wim@fluendo.com>
 *
 * gstghostpad.c: Unit test for GstGhostPad
 *
 * 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.
 */

#include <gst/check/gstcheck.h>

/* test if removing a bin also cleans up the ghostpads
 */
GST_START_TEST (test_remove1)
{
  GstElement *b1, *b2, *src, *sink;
  GstPad *srcpad, *sinkpad;
  GstPadLinkReturn ret;

  b1 = gst_element_factory_make ("pipeline", NULL);
  b2 = gst_element_factory_make ("bin", NULL);
  src = gst_element_factory_make ("fakesrc", NULL);
  sink = gst_element_factory_make ("fakesink", NULL);
  ASSERT_OBJECT_REFCOUNT (b1, "pipeline", 1);
  ASSERT_OBJECT_REFCOUNT (b2, "bin", 1);

  fail_unless (gst_bin_add (GST_BIN (b2), sink));
  fail_unless (gst_bin_add (GST_BIN (b1), src));
  ASSERT_OBJECT_REFCOUNT (b1, "pipeline", 1);
  ASSERT_OBJECT_REFCOUNT (b2, "bin", 1);
  fail_unless (gst_bin_add (GST_BIN (b1), b2));
  ASSERT_OBJECT_REFCOUNT (b1, "pipeline", 1);
  ASSERT_OBJECT_REFCOUNT (b2, "bin", 1);

  sinkpad = gst_element_get_pad (sink, "sink");
  gst_element_add_pad (b2, gst_ghost_pad_new ("sink", sinkpad));
  gst_object_unref (sinkpad);

  srcpad = gst_element_get_pad (src, "src");
  /* get the ghostpad */
  sinkpad = gst_element_get_pad (b2, "sink");

  ret = gst_pad_link (srcpad, sinkpad);
  fail_unless (ret == GST_PAD_LINK_OK);
  gst_object_unref (srcpad);
  gst_object_unref (sinkpad);

  /* now remove the bin with the ghostpad, b2 is disposed now. */
  ASSERT_OBJECT_REFCOUNT (b1, "pipeline", 1);
  ASSERT_OBJECT_REFCOUNT (b2, "bin", 1);
  gst_bin_remove (GST_BIN (b1), b2);

  srcpad = gst_element_get_pad (src, "src");
  /* pad cannot be linked now */
  fail_if (gst_pad_is_linked (srcpad));
  gst_object_unref (srcpad);

  ASSERT_OBJECT_REFCOUNT (b1, "pipeline", 1);
  gst_object_unref (b1);
}

GST_END_TEST;

/* test if removing a bin also cleans up the ghostpads
 */
GST_START_TEST (test_remove2)
{
  GstElement *b1, *b2, *src, *sink;
  GstPad *srcpad, *sinkpad;
  GstPadLinkReturn ret;

  b1 = gst_element_factory_make ("pipeline", NULL);
  b2 = gst_element_factory_make ("bin", NULL);
  src = gst_element_factory_make ("fakesrc", NULL);
  sink = gst_element_factory_make ("fakesink", NULL);
  ASSERT_OBJECT_REFCOUNT (src, "src", 1);

  fail_unless (gst_bin_add (GST_BIN (b2), sink));
  fail_unless (gst_bin_add (GST_BIN (b1), src));
  fail_unless (gst_bin_add (GST_BIN (b1), b2));
  ASSERT_OBJECT_REFCOUNT (src, "src", 1);

  sinkpad = gst_element_get_pad (sink, "sink");
  gst_element_add_pad (b2, gst_ghost_pad_new ("sink", sinkpad));
  gst_object_unref (sinkpad);

  srcpad = gst_element_get_pad (src, "src");
  ASSERT_OBJECT_REFCOUNT (srcpad, "srcpad", 2); /* since we got one */
  /* get the ghostpad */
  sinkpad = gst_element_get_pad (b2, "sink");
  ASSERT_OBJECT_REFCOUNT (sinkpad, "sinkpad", 2);       /* since we got one */

  GST_DEBUG ("linking srcpad and sinkpad");
  ret = gst_pad_link (srcpad, sinkpad);
  GST_DEBUG ("linked srcpad and sinkpad");
  fail_unless (ret == GST_PAD_LINK_OK);
  /* the linking causes a proxypad to be created for srcpad,
   * to which sinkpad gets linked.  This proxypad has a ref to srcpad */
  ASSERT_OBJECT_REFCOUNT (srcpad, "srcpad", 3);
  ASSERT_OBJECT_REFCOUNT (sinkpad, "sinkpad", 2);
  gst_object_unref (srcpad);
  gst_object_unref (sinkpad);

  /* now remove the sink from the bin */
  gst_bin_remove (GST_BIN (b2), sink);

  srcpad = gst_element_get_pad (src, "src");
  /* pad is still linked to ghostpad */
  fail_if (!gst_pad_is_linked (srcpad));
  ASSERT_OBJECT_REFCOUNT (src, "src", 1);
  ASSERT_OBJECT_REFCOUNT (srcpad, "srcpad", 3);
  gst_object_unref (srcpad);
  ASSERT_OBJECT_REFCOUNT (sinkpad, "sinkpad", 1);

  /* cleanup */
  /* now unlink the pads */
  gst_pad_unlink (srcpad, sinkpad);
  ASSERT_OBJECT_REFCOUNT (srcpad, "srcpad", 1); /* proxy has dropped ref */
  ASSERT_OBJECT_REFCOUNT (sinkpad, "sinkpad", 1);

  ASSERT_OBJECT_REFCOUNT (src, "src", 1);
  ASSERT_OBJECT_REFCOUNT (b2, "bin", 1);
  /* remove b2 from b1 */
  gst_bin_remove (GST_BIN (b1), b2);

  /* flush the message, dropping the b1 refcount to 1 */
  gst_element_set_state (b1, GST_STATE_READY);
  gst_element_set_state (b1, GST_STATE_NULL);
  ASSERT_OBJECT_REFCOUNT (b1, "pipeline", 1);
  gst_object_unref (b1);
}

GST_END_TEST;

/* test if a ghost pad without a target can be linked and
 * unlinked. An untargeted ghostpad has a default ANY caps unless there 
 * is a padtemplate that says something else.
 */
GST_START_TEST (test_ghost_pads_notarget)
{
  GstElement *b1, *b2, *sink;
  GstPad *srcpad, *sinkpad, *peer;
  GstPadLinkReturn ret;
  gboolean bret;
  GstBus *bus;
  GstCaps *caps;

  b1 = gst_element_factory_make ("pipeline", NULL);

  /* make sure all messages are discarded */
  bus = gst_pipeline_get_bus (GST_PIPELINE (b1));
  gst_bus_set_flushing (bus, TRUE);
  gst_object_unref (bus);

  b2 = gst_element_factory_make ("bin", NULL);
  sink = gst_element_factory_make ("fakesink", NULL);

  fail_unless (gst_bin_add (GST_BIN (b1), sink));
  fail_unless (gst_bin_add (GST_BIN (b1), b2));

  srcpad = gst_ghost_pad_new_no_target ("src", GST_PAD_SRC);
  fail_unless (srcpad != NULL);
  sinkpad = gst_element_get_pad (sink, "sink");
  fail_unless (sinkpad != NULL);

  ret = gst_pad_link (srcpad, sinkpad);
  fail_unless (ret == GST_PAD_LINK_OK);

  /* check if the peers are ok */
  peer = gst_pad_get_peer (srcpad);
  fail_unless (peer == sinkpad);
  gst_object_unref (peer);

  peer = gst_pad_get_peer (sinkpad);
  fail_unless (peer == srcpad);
  gst_object_unref (peer);

  /* check caps, untargetted pad should return ANY or the padtemplate caps 
   * when it was created from a template */
  caps = gst_pad_get_caps (srcpad);
  fail_unless (gst_caps_is_any (caps));
  gst_caps_unref (caps);

  /* unlink */
  bret = gst_pad_unlink (srcpad, sinkpad);
  fail_unless (bret == TRUE);

  /* cleanup */
  gst_object_unref (srcpad);
  gst_object_unref (sinkpad);
  gst_object_unref (b1);
}

GST_END_TEST;

/* test if linking fails over different bins using a pipeline
 * like this:
 *
 * fakesrc num_buffers=10 ! ( fakesink )
 *
 */
GST_START_TEST (test_link)
{
  GstElement *b1, *b2, *src, *sink;
  GstPad *srcpad, *sinkpad, *gpad;
  GstPadLinkReturn ret;

  b1 = gst_element_factory_make ("pipeline", NULL);
  b2 = gst_element_factory_make ("bin", NULL);
  src = gst_element_factory_make ("fakesrc", NULL);
  sink = gst_element_factory_make ("fakesink", NULL);

  fail_unless (gst_bin_add (GST_BIN (b2), sink));
  fail_unless (gst_bin_add (GST_BIN (b1), src));
  fail_unless (gst_bin_add (GST_BIN (b1), b2));

  srcpad = gst_element_get_pad (src, "src");
  fail_unless (srcpad != NULL);
  sinkpad = gst_element_get_pad (sink, "sink");
  fail_unless (sinkpad != NULL);

  /* linking in different hierarchies should fail */
  ret = gst_pad_link (srcpad, sinkpad);
  fail_unless (ret == GST_PAD_LINK_WRONG_HIERARCHY);

  /* now setup a ghostpad */
  gpad = gst_ghost_pad_new ("sink", sinkpad);
  gst_object_unref (sinkpad);
  /* need to ref as _add_pad takes ownership */
  gst_object_ref (gpad);
  gst_element_add_pad (b2, gpad);

  /* our new sinkpad */
  sinkpad = gpad;

  /* and linking should work now */
  ret = gst_pad_link (srcpad, sinkpad);
  fail_unless (ret == GST_PAD_LINK_OK);

  /* flush the message, dropping the b1 refcount to 1 */
  gst_element_set_state (b1, GST_STATE_READY);
  gst_element_set_state (b1, GST_STATE_NULL);
  ASSERT_OBJECT_REFCOUNT (b1, "pipeline", 1);

  gst_object_unref (srcpad);
  gst_object_unref (sinkpad);
  gst_object_unref (b1);
}

GST_END_TEST;

/* test if ghostpads are created automagically when using
 * gst_element_link_pads.
 *
 * fakesrc num_buffers=10 ! ( identity ) ! fakesink
 */
GST_START_TEST (test_ghost_pads)
{
  GstElement *b1, *b2, *src, *i1, *sink;
  GstPad *gsink, *gsrc, *gisrc, *gisink, *isink, *isrc, *fsrc, *fsink;
  GstStateChangeReturn ret;

  b1 = gst_element_factory_make ("pipeline", NULL);
  b2 = gst_element_factory_make ("bin", NULL);
  src = gst_element_factory_make ("fakesrc", NULL);
  g_object_set (src, "num-buffers", (int) 10, NULL);
  i1 = gst_element_factory_make ("identity", NULL);
  sink = gst_element_factory_make ("fakesink", NULL);

  fail_unless (gst_bin_add (GST_BIN (b2), i1));
  fail_unless (gst_bin_add (GST_BIN (b1), src));
  fail_unless (gst_bin_add (GST_BIN (b1), b2));
  fail_unless (gst_bin_add (GST_BIN (b1), sink));
  fail_unless (gst_element_link_pads (src, NULL, i1, NULL));
  fail_unless (gst_element_link_pads (i1, NULL, sink, NULL));
  GST_OBJECT_LOCK (b2);
  fail_unless (b2->numsinkpads == 1);
  fail_unless (GST_IS_GHOST_PAD (b2->sinkpads->data));
  fail_unless (b2->numsrcpads == 1);
  fail_unless (GST_IS_GHOST_PAD (b2->srcpads->data));
  GST_OBJECT_UNLOCK (b2);

  fsrc = gst_element_get_pad (src, "src");
  fail_unless (fsrc != NULL);
  gsink = GST_PAD (gst_object_ref (b2->sinkpads->data));
  fail_unless (gsink != NULL);
  gsrc = GST_PAD (gst_object_ref (b2->srcpads->data));
  fail_unless (gsrc != NULL);
  fsink = gst_element_get_pad (sink, "sink");
  fail_unless (fsink != NULL);

  isink = gst_element_get_pad (i1, "sink");
  fail_unless (isink != NULL);
  isrc = gst_element_get_pad (i1, "src");
  fail_unless (isrc != NULL);
  gisrc = gst_pad_get_peer (isink);
  fail_unless (gisrc != NULL);
  gisink = gst_pad_get_peer (isrc);
  fail_unless (gisink != NULL);

  /* all objects above have one refcount owned by us as well */

  ASSERT_OBJECT_REFCOUNT (fsrc, "fsrc", 3);     /* parent and gisrc */
  ASSERT_OBJECT_REFCOUNT (gsink, "gsink", 2);   /* parent */
  ASSERT_OBJECT_REFCOUNT (gsrc, "gsrc", 2);     /* parent */
  ASSERT_OBJECT_REFCOUNT (fsink, "fsink", 3);   /* parent and gisink */

  ASSERT_OBJECT_REFCOUNT (gisrc, "gisrc", 2);   /* parent */
  ASSERT_OBJECT_REFCOUNT (isink, "isink", 3);   /* parent and gsink */
  ASSERT_OBJECT_REFCOUNT (gisink, "gisink", 2); /* parent */
  ASSERT_OBJECT_REFCOUNT (isrc, "isrc", 3);     /* parent and gsrc */

  ret = gst_element_set_state (b1, GST_STATE_PLAYING);
  ret = gst_element_get_state (b1, NULL, NULL, GST_CLOCK_TIME_NONE);
  fail_unless (ret == GST_STATE_CHANGE_SUCCESS);

  ret = gst_element_set_state (b1, GST_STATE_NULL);
  ret = gst_element_get_state (b1, NULL, NULL, GST_CLOCK_TIME_NONE);
  fail_unless (ret == GST_STATE_CHANGE_SUCCESS);

  gst_object_unref (b1);
  /* unreffing the bin will unref all elements, which will unlink and unparent
   * all pads */

  /* wait for thread to settle down */
  while (GST_OBJECT_REFCOUNT_VALUE (fsrc) > 2)
    THREAD_SWITCH ();

  ASSERT_OBJECT_REFCOUNT (fsrc, "fsrc", 1);
  ASSERT_OBJECT_REFCOUNT (gsink, "gsink", 1);
  ASSERT_OBJECT_REFCOUNT (gsrc, "gsink", 1);
  ASSERT_OBJECT_REFCOUNT (fsink, "fsink", 1);

  ASSERT_OBJECT_REFCOUNT (gisrc, "gisrc", 2);   /* gsink */
  ASSERT_OBJECT_REFCOUNT (isink, "isink", 2);   /* gsink */
  ASSERT_OBJECT_REFCOUNT (gisink, "gisink", 2); /* gsrc */
  ASSERT_OBJECT_REFCOUNT (isrc, "isrc", 2);     /* gsrc */

  gst_object_unref (gsink);
  ASSERT_OBJECT_REFCOUNT (isink, "isink", 1);
  ASSERT_OBJECT_REFCOUNT (gisrc, "gisrc", 1);
  ASSERT_OBJECT_REFCOUNT (fsrc, "fsrc", 1);
  gst_object_unref (gisrc);
  ASSERT_OBJECT_REFCOUNT (fsrc, "fsrc", 1);

  gst_object_unref (gsrc);
  ASSERT_OBJECT_REFCOUNT (isrc, "isrc", 1);
  ASSERT_OBJECT_REFCOUNT (gisink, "gisink", 1);
  ASSERT_OBJECT_REFCOUNT (fsink, "fsink", 1);
  gst_object_unref (gisink);
  ASSERT_OBJECT_REFCOUNT (fsink, "fsink", 1);

  gst_object_unref (fsrc);
  gst_object_unref (isrc);
  gst_object_unref (isink);
  gst_object_unref (fsink);
}

GST_END_TEST;

GST_START_TEST (test_ghost_pads_bin)
{
  GstBin *pipeline;
  GstBin *srcbin;
  GstBin *sinkbin;
  GstElement *src;
  GstElement *sink;
  GstPad *srcpad, *srcghost, *target;
  GstPad *sinkpad, *sinkghost;

  pipeline = GST_BIN (gst_pipeline_new ("pipe"));
  ASSERT_OBJECT_REFCOUNT (pipeline, "pipeline", 1);

  srcbin = GST_BIN (gst_bin_new ("srcbin"));
  gst_bin_add (pipeline, GST_ELEMENT (srcbin));
  ASSERT_OBJECT_REFCOUNT (pipeline, "pipeline", 1);

  sinkbin = GST_BIN (gst_bin_new ("sinkbin"));
  gst_bin_add (pipeline, GST_ELEMENT (sinkbin));
  ASSERT_OBJECT_REFCOUNT (pipeline, "pipeline", 1);

  src = gst_element_factory_make ("fakesrc", "src");
  gst_bin_add (srcbin, src);
  srcpad = gst_element_get_pad (src, "src");
  srcghost = gst_ghost_pad_new ("src", srcpad);
  gst_object_unref (srcpad);
  gst_element_add_pad (GST_ELEMENT (srcbin), srcghost);

  sink = gst_element_factory_make ("fakesink", "sink");
  gst_bin_add (sinkbin, sink);
  sinkpad = gst_element_get_pad (sink, "sink");
  sinkghost = gst_ghost_pad_new ("sink", sinkpad);
  gst_object_unref (sinkpad);
  gst_element_add_pad (GST_ELEMENT (sinkbin), sinkghost);

  gst_element_link (GST_ELEMENT (srcbin), GST_ELEMENT (sinkbin));

  fail_unless (GST_PAD_PEER (srcghost) != NULL);
  fail_unless (GST_PAD_PEER (sinkghost) != NULL);
  target = gst_ghost_pad_get_target (GST_GHOST_PAD (srcghost));
  fail_unless (GST_PAD_PEER (target) != NULL);
  gst_object_unref (target);
  target = gst_ghost_pad_get_target (GST_GHOST_PAD (sinkghost));
  fail_unless (GST_PAD_PEER (target) != NULL);
  gst_object_unref (target);

  ASSERT_OBJECT_REFCOUNT (pipeline, "pipeline", 1);

  gst_object_unref (pipeline);
}

GST_END_TEST;

typedef struct
{
  GMutex *mutex;
  GCond *cond;
} BlockData;

static void
block_callback (GstPad * pad, gboolean blocked, gpointer user_data)
{
  BlockData *block_data = (BlockData *) user_data;

  g_mutex_lock (block_data->mutex);
  GST_DEBUG ("blocked\n");
  g_cond_signal (block_data->cond);
  g_mutex_unlock (block_data->mutex);
}

GST_START_TEST (test_ghost_pads_block)
{
  GstBin *pipeline;
  GstBin *srcbin;
  GstElement *src;
  GstPad *srcpad;
  GstPad *srcghost;
  BlockData block_data;

  pipeline = GST_BIN (gst_pipeline_new ("pipeline"));

  srcbin = GST_BIN (gst_bin_new ("srcbin"));
  gst_bin_add (pipeline, GST_ELEMENT (srcbin));

  src = gst_element_factory_make ("fakesrc", "src");
  gst_bin_add (srcbin, src);
  srcpad = gst_element_get_pad (src, "src");
  srcghost = gst_ghost_pad_new ("src", srcpad);
  gst_element_add_pad (GST_ELEMENT (srcbin), srcghost);
  gst_object_unref (srcpad);

  block_data.mutex = g_mutex_new ();
  block_data.cond = g_cond_new ();

  g_mutex_lock (block_data.mutex);
  gst_pad_set_blocked_async (srcghost, TRUE, block_callback, &block_data);
  gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING);
  /* and wait now */
  g_cond_wait (block_data.cond, block_data.mutex);
  gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL);
  g_mutex_unlock (block_data.mutex);

  g_mutex_free (block_data.mutex);
  g_cond_free (block_data.cond);

  ASSERT_OBJECT_REFCOUNT (pipeline, "pipeline", 1);
  gst_object_unref (pipeline);
}

GST_END_TEST;

GST_START_TEST (test_ghost_pads_probes)
{
  GstBin *pipeline;
  GstBin *srcbin;
  GstElement *src;
  GstPad *srcpad;
  GstPad *srcghost;
  BlockData block_data;

  pipeline = GST_BIN (gst_pipeline_new ("pipeline"));

  srcbin = GST_BIN (gst_bin_new ("srcbin"));
  gst_bin_add (pipeline, GST_ELEMENT (srcbin));

  src = gst_element_factory_make ("fakesrc", "src");
  gst_bin_add (srcbin, src);
  srcpad = gst_element_get_pad (src, "src");
  srcghost = gst_ghost_pad_new ("src", srcpad);
  gst_element_add_pad (GST_ELEMENT (srcbin), srcghost);
  gst_object_unref (srcpad);

  block_data.mutex = g_mutex_new ();
  block_data.cond = g_cond_new ();

  g_mutex_lock (block_data.mutex);
  gst_pad_set_blocked_async (srcghost, TRUE, block_callback, &block_data);
  gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING);
  /* and wait now */
  g_cond_wait (block_data.cond, block_data.mutex);
  gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL);
  g_mutex_unlock (block_data.mutex);

  g_mutex_free (block_data.mutex);
  g_cond_free (block_data.cond);

  ASSERT_OBJECT_REFCOUNT (pipeline, "pipeline", 1);
  gst_object_unref (pipeline);
}

GST_END_TEST;

GST_START_TEST (test_ghost_pads_new_from_template)
{
  GstPad *sinkpad, *ghostpad;
  GstPadTemplate *padtempl, *ghosttempl;
  GstCaps *padcaps, *ghostcaps, *newcaps;

  padcaps = gst_caps_from_string ("some/caps");
  fail_unless (padcaps != NULL);
  ghostcaps = gst_caps_from_string ("some/caps;some/other-caps");
  fail_unless (ghostcaps != NULL);

  padtempl = gst_pad_template_new ("padtempl", GST_PAD_SINK,
      GST_PAD_ALWAYS, padcaps);
  fail_unless (padtempl != NULL);
  ghosttempl = gst_pad_template_new ("ghosttempl", GST_PAD_SINK,
      GST_PAD_ALWAYS, ghostcaps);

  sinkpad = gst_pad_new_from_template (padtempl, "sinkpad");
  fail_unless (sinkpad != NULL);

  ghostpad = gst_ghost_pad_new_from_template ("ghostpad", sinkpad, ghosttempl);
  fail_unless (ghostpad != NULL);

  /* check template is properly set */
  fail_unless (GST_PAD_PAD_TEMPLATE (ghostpad) == ghosttempl);

  /* check ghostpad caps are from the sinkpad */
  newcaps = gst_pad_get_caps (ghostpad);
  fail_unless (newcaps != NULL);
  fail_unless (gst_caps_is_equal (newcaps, padcaps));
  gst_caps_unref (newcaps);
  gst_caps_unref (padcaps);
}

GST_END_TEST;

GST_START_TEST (test_ghost_pads_new_no_target_from_template)
{
  GstPad *sinkpad, *ghostpad;
  GstPadTemplate *padtempl, *ghosttempl;
  GstCaps *padcaps, *ghostcaps, *newcaps;

  padcaps = gst_caps_from_string ("some/caps");
  fail_unless (padcaps != NULL);
  ghostcaps = gst_caps_from_string ("some/caps;some/other-caps");
  fail_unless (ghostcaps != NULL);

  padtempl = gst_pad_template_new ("padtempl", GST_PAD_SINK,
      GST_PAD_ALWAYS, padcaps);
  fail_unless (padtempl != NULL);
  ghosttempl = gst_pad_template_new ("ghosttempl", GST_PAD_SINK,
      GST_PAD_ALWAYS, ghostcaps);

  sinkpad = gst_pad_new_from_template (padtempl, "sinkpad");
  fail_unless (sinkpad != NULL);

  ghostpad = gst_ghost_pad_new_no_target_from_template ("ghostpad", ghosttempl);
  fail_unless (ghostpad != NULL);

  /* check template is properly set */
  fail_unless (GST_PAD_PAD_TEMPLATE (ghostpad) == ghosttempl);

  /* check ghostpad caps are from the ghostpad template */
  newcaps = gst_pad_get_caps (ghostpad);
  fail_unless (newcaps != NULL);
  fail_unless (gst_caps_is_equal (newcaps, ghostcaps));
  gst_caps_unref (newcaps);

  fail_unless (gst_ghost_pad_set_target ((GstGhostPad *) ghostpad, sinkpad));

  /* check ghostpad caps are now from the target pad */
  newcaps = gst_pad_get_caps (ghostpad);
  fail_unless (newcaps != NULL);
  fail_unless (gst_caps_is_equal (newcaps, padcaps));
  gst_caps_unref (newcaps);

}

GST_END_TEST;

static Suite *
gst_ghost_pad_suite (void)
{
  Suite *s = suite_create ("GstGhostPad");
  TCase *tc_chain = tcase_create ("ghost pad tests");

  suite_add_tcase (s, tc_chain);
  tcase_add_test (tc_chain, test_remove1);
  tcase_add_test (tc_chain, test_remove2);
  tcase_add_test (tc_chain, test_link);
  tcase_add_test (tc_chain, test_ghost_pads);
  tcase_add_test (tc_chain, test_ghost_pads_bin);
  tcase_add_test (tc_chain, test_ghost_pads_notarget);
  tcase_add_test (tc_chain, test_ghost_pads_block);
  tcase_add_test (tc_chain, test_ghost_pads_probes);
  tcase_add_test (tc_chain, test_ghost_pads_new_from_template);
  tcase_add_test (tc_chain, test_ghost_pads_new_no_target_from_template);

  return s;
}

GST_CHECK_MAIN (gst_ghost_pad);