tests/check/elements/rtpjitterbuffer.c - imx-gst-plugins-good - Git at Google

 /* GStreamer
  *
  * Copyright (C) 2009 Nokia Corporation and its subsidary(-ies)
  *               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., 51 Franklin St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 #include <gst/check/gstcheck.h>

 /* For ease of programming we use globals to keep refs for our floating
  * src and sink pads we create; otherwise we always have to do get_pad,
  * get_peer, and then remove references in every test function */
 static GstPad *mysrcpad, *mysinkpad;
 /* we also have a list of src buffers */
 static GList *inbuffers = NULL;
 static gint num_dropped = 0;

 #define RTP_CAPS_STRING    \
     "application/x-rtp, "               \
     "media = (string)audio, "           \
     "payload = (int) 0, "               \
     "clock-rate = (int) 8000, "         \
     "encoding-name = (string)PCMU"

 #define RTP_FRAME_SIZE 20

 static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("application/x-rtp")
     );
 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("application/x-rtp, "
         "clock-rate = (int) [ 1, 2147483647 ]")
     );

 static void
 buffer_dropped (gpointer data, GstMiniObject * obj)
 {
   GST_DEBUG ("dropping buffer %p", obj);
   num_dropped++;
 }

 static GstElement *
 setup_jitterbuffer (gint num_buffers)
 {
   GstElement *jitterbuffer;
   GstClock *clock;
   GstBuffer *buffer;
   GstCaps *caps;
   /* a 20 sample audio block (2,5 ms) generated with
    * gst-launch audiotestsrc wave=silence blocksize=40 num-buffers=3 !
    *    "audio/x-raw,channels=1,rate=8000" ! mulawenc ! rtppcmupay !
    *     fakesink dump=1
    */
   guint8 in[] = {               /* first 4 bytes are rtp-header, next 4 bytes are timestamp */
     0x80, 0x80, 0x1c, 0x24, 0x46, 0xcd, 0xb7, 0x11, 0x3c, 0x3a, 0x7c, 0x5b,
     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
   };
   GstClockTime ts = G_GUINT64_CONSTANT (0);
   GstClockTime tso = gst_util_uint64_scale (RTP_FRAME_SIZE, GST_SECOND, 8000);
   /*guint latency = GST_TIME_AS_MSECONDS (num_buffers * tso); */
   gint i;

   GST_DEBUG ("setup_jitterbuffer");
   jitterbuffer = gst_check_setup_element ("rtpjitterbuffer");
   /* we need a clock here */
   clock = gst_system_clock_obtain ();
   gst_element_set_clock (jitterbuffer, clock);
   gst_object_unref (clock);
   /* setup latency */
   /* latency would be 7 for 3 buffers here, default is 200
      g_object_set (G_OBJECT (jitterbuffer), "latency", latency, NULL);
      GST_INFO_OBJECT (jitterbuffer, "set latency to %u ms", latency);
    */

   mysrcpad = gst_check_setup_src_pad (jitterbuffer, &srctemplate);
   mysinkpad = gst_check_setup_sink_pad (jitterbuffer, &sinktemplate);
   gst_pad_set_active (mysrcpad, TRUE);
   gst_pad_set_active (mysinkpad, TRUE);

   /* create n buffers */
   caps = gst_caps_from_string (RTP_CAPS_STRING);
   gst_pad_set_caps (mysrcpad, caps);
   gst_caps_unref (caps);

   for (i = 0; i < num_buffers; i++) {
     buffer = gst_buffer_new_and_alloc (sizeof (in));
     gst_buffer_fill (buffer, 0, in, sizeof (in));
     GST_BUFFER_TIMESTAMP (buffer) = ts;
     GST_BUFFER_DURATION (buffer) = tso;
     gst_mini_object_weak_ref (GST_MINI_OBJECT (buffer), buffer_dropped, NULL);
     GST_DEBUG ("created buffer: %p", buffer);

     if (!i)
       GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);

     inbuffers = g_list_append (inbuffers, buffer);

     /* hackish way to update the rtp header */
     in[1] = 0x00;
     in[3]++;                    /* seqnumber */
     in[7] += RTP_FRAME_SIZE;    /* inc. timestamp with framesize */
     ts += tso;
   }
   num_dropped = 0;

   return jitterbuffer;
 }

 static GstStateChangeReturn
 start_jitterbuffer (GstElement * jitterbuffer)
 {
   GstStateChangeReturn ret;
   GstClockTime now;
   GstClock *clock;

   clock = gst_element_get_clock (jitterbuffer);
   now = gst_clock_get_time (clock);
   gst_object_unref (clock);

   gst_element_set_base_time (jitterbuffer, now);
   ret = gst_element_set_state (jitterbuffer, GST_STATE_PLAYING);

   return ret;
 }

 static void
 cleanup_jitterbuffer (GstElement * jitterbuffer)
 {
   GST_DEBUG ("cleanup_jitterbuffer");

   g_list_foreach (buffers, (GFunc) gst_mini_object_unref, NULL);
   g_list_free (buffers);
   buffers = NULL;

   g_list_free (inbuffers);
   inbuffers = NULL;

   gst_pad_set_active (mysrcpad, FALSE);
   gst_pad_set_active (mysinkpad, FALSE);
   gst_check_teardown_src_pad (jitterbuffer);
   gst_check_teardown_sink_pad (jitterbuffer);
   gst_check_teardown_element (jitterbuffer);
 }

 static void
 check_jitterbuffer_results (GstElement * jitterbuffer, gint num_buffers)
 {
   GstBuffer *buffer;
   GList *node;
   GstClockTime ts = G_GUINT64_CONSTANT (0);
   GstClockTime tso = gst_util_uint64_scale (RTP_FRAME_SIZE, GST_SECOND, 8000);
   GstMapInfo map;
   guint16 prev_sn = 0, cur_sn;
   guint32 prev_ts = 0, cur_ts;

   /* sleep for twice the latency */
   g_usleep (400 * 1000);

   GST_INFO ("of %d buffer %d/%d received/dropped", num_buffers,
       g_list_length (buffers), num_dropped);
   /* if this fails, not all buffers have been processed */
   fail_unless_equals_int ((g_list_length (buffers) + num_dropped), num_buffers);

   /* check the buffer list */
   fail_unless_equals_int (g_list_length (buffers), num_buffers);
   for (node = buffers; node; node = g_list_next (node)) {
     fail_if ((buffer = (GstBuffer *) node->data) == NULL);
     fail_if (GST_BUFFER_TIMESTAMP (buffer) != ts);
     gst_buffer_map (buffer, &map, GST_MAP_READ);
     cur_sn = ((guint16) map.data[2] << 8) | map.data[3];
     cur_ts = ((guint32) map.data[4] << 24) | ((guint32) map.data[5] << 16) |
         ((guint32) map.data[6] << 8) | map.data[7];
     gst_buffer_unmap (buffer, &map);

     if (node != buffers) {
       fail_unless (cur_sn > prev_sn);
       fail_unless (cur_ts > prev_ts);

       prev_sn = cur_sn;
       prev_ts = cur_ts;
     }
     ts += tso;
   }
 }

 GST_START_TEST (test_push_forward_seq)
 {
   GstElement *jitterbuffer;
   const guint num_buffers = 3;
   GstBuffer *buffer;
   GList *node;

   jitterbuffer = setup_jitterbuffer (num_buffers);
   fail_unless (start_jitterbuffer (jitterbuffer)
       == GST_STATE_CHANGE_SUCCESS, "could not set to playing");

   /* push buffers: 0,1,2, */
   for (node = inbuffers; node; node = g_list_next (node)) {
     buffer = (GstBuffer *) node->data;
     fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
   }

   /* check the buffer list */
   check_jitterbuffer_results (jitterbuffer, num_buffers);

   /* cleanup */
   cleanup_jitterbuffer (jitterbuffer);
 }

 GST_END_TEST;

 GST_START_TEST (test_push_backward_seq)
 {
   GstElement *jitterbuffer;
   const guint num_buffers = 4;
   GstBuffer *buffer;
   GList *node;

   jitterbuffer = setup_jitterbuffer (num_buffers);
   fail_unless (start_jitterbuffer (jitterbuffer)
       == GST_STATE_CHANGE_SUCCESS, "could not set to playing");

   /* push buffers: 0,3,2,1 */
   buffer = (GstBuffer *) inbuffers->data;
   fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
   for (node = g_list_last (inbuffers); node != inbuffers;
       node = g_list_previous (node)) {
     buffer = (GstBuffer *) node->data;
     fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
   }

   /* check the buffer list */
   check_jitterbuffer_results (jitterbuffer, num_buffers);

   /* cleanup */
   cleanup_jitterbuffer (jitterbuffer);
 }

 GST_END_TEST;

 GST_START_TEST (test_push_unordered)
 {
   GstElement *jitterbuffer;
   const guint num_buffers = 4;
   GstBuffer *buffer;

   jitterbuffer = setup_jitterbuffer (num_buffers);
   fail_unless (start_jitterbuffer (jitterbuffer)
       == GST_STATE_CHANGE_SUCCESS, "could not set to playing");

   /* push buffers; 0,2,1,3 */
   buffer = (GstBuffer *) inbuffers->data;
   fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
   buffer = g_list_nth_data (inbuffers, 2);
   fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
   buffer = g_list_nth_data (inbuffers, 1);
   fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
   buffer = g_list_nth_data (inbuffers, 3);
   fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);

   /* check the buffer list */
   check_jitterbuffer_results (jitterbuffer, num_buffers);

   /* cleanup */
   cleanup_jitterbuffer (jitterbuffer);
 }

 GST_END_TEST;

 GST_START_TEST (test_basetime)
 {
   GstElement *jitterbuffer;
   const guint num_buffers = 3;
   GstBuffer *buffer;
   GList *node;
   GstClockTime tso = gst_util_uint64_scale (RTP_FRAME_SIZE, GST_SECOND, 8000);

   jitterbuffer = setup_jitterbuffer (num_buffers);
   fail_unless (start_jitterbuffer (jitterbuffer)
       == GST_STATE_CHANGE_SUCCESS, "could not set to playing");

   /* push buffers: 2,1,0 */
   for (node = g_list_last (inbuffers); node; node = g_list_previous (node)) {
     buffer = (GstBuffer *) node->data;
     fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
   }

   /* sleep for twice the latency */
   g_usleep (400 * 1000);

   /* if this fails, not all buffers have been processed */
   fail_unless_equals_int ((g_list_length (buffers) + num_dropped), num_buffers);

   buffer = (GstBuffer *) buffers->data;
   fail_unless (GST_BUFFER_TIMESTAMP (buffer) != (num_buffers * tso));

   /* cleanup */
   cleanup_jitterbuffer (jitterbuffer);
 }

 GST_END_TEST;


 static Suite *
 rtpjitterbuffer_suite (void)
 {
   Suite *s = suite_create ("rtpjitterbuffer");
   TCase *tc_chain = tcase_create ("general");

   suite_add_tcase (s, tc_chain);
   tcase_add_test (tc_chain, test_push_forward_seq);
   tcase_add_test (tc_chain, test_push_backward_seq);
   tcase_add_test (tc_chain, test_push_unordered);
   tcase_add_test (tc_chain, test_basetime);

   /* FIXME: test buffer lists */

   return s;
 }

 GST_CHECK_MAIN (rtpjitterbuffer);
	/* GStreamer
	*
	* Copyright (C) 2009 Nokia Corporation and its subsidary(-ies)
	* 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., 51 Franklin St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#include <gst/check/gstcheck.h>

	/* For ease of programming we use globals to keep refs for our floating
	* src and sink pads we create; otherwise we always have to do get_pad,
	* get_peer, and then remove references in every test function */
	static GstPad mysrcpad, mysinkpad;
	/* we also have a list of src buffers */
	static GList *inbuffers = NULL;
	static gint num_dropped = 0;

	#define RTP_CAPS_STRING \
	"application/x-rtp, " \
	"media = (string)audio, " \
	"payload = (int) 0, " \
	"clock-rate = (int) 8000, " \
	"encoding-name = (string)PCMU"

	#define RTP_FRAME_SIZE 20

	static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("application/x-rtp")
	);
	static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("application/x-rtp, "
	"clock-rate = (int) [ 1, 2147483647 ]")
	);

	static void
	buffer_dropped (gpointer data, GstMiniObject * obj)
	{
	GST_DEBUG ("dropping buffer %p", obj);
	num_dropped++;
	}

	static GstElement *
	setup_jitterbuffer (gint num_buffers)
	{
	GstElement *jitterbuffer;
	GstClock *clock;
	GstBuffer *buffer;
	GstCaps *caps;
	/* a 20 sample audio block (2,5 ms) generated with
	* gst-launch audiotestsrc wave=silence blocksize=40 num-buffers=3 !
	* "audio/x-raw,channels=1,rate=8000" ! mulawenc ! rtppcmupay !
	* fakesink dump=1
	*/
	guint8 in[] = { /* first 4 bytes are rtp-header, next 4 bytes are timestamp */
	0x80, 0x80, 0x1c, 0x24, 0x46, 0xcd, 0xb7, 0x11, 0x3c, 0x3a, 0x7c, 0x5b,
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
	};
	GstClockTime ts = G_GUINT64_CONSTANT (0);
	GstClockTime tso = gst_util_uint64_scale (RTP_FRAME_SIZE, GST_SECOND, 8000);
	/guint latency = GST_TIME_AS_MSECONDS (num_buffers tso); */
	gint i;

	GST_DEBUG ("setup_jitterbuffer");
	jitterbuffer = gst_check_setup_element ("rtpjitterbuffer");
	/* we need a clock here */
	clock = gst_system_clock_obtain ();
	gst_element_set_clock (jitterbuffer, clock);
	gst_object_unref (clock);
	/* setup latency */
	/* latency would be 7 for 3 buffers here, default is 200
	g_object_set (G_OBJECT (jitterbuffer), "latency", latency, NULL);
	GST_INFO_OBJECT (jitterbuffer, "set latency to %u ms", latency);
	*/

	mysrcpad = gst_check_setup_src_pad (jitterbuffer, &srctemplate);
	mysinkpad = gst_check_setup_sink_pad (jitterbuffer, &sinktemplate);
	gst_pad_set_active (mysrcpad, TRUE);
	gst_pad_set_active (mysinkpad, TRUE);

	/* create n buffers */
	caps = gst_caps_from_string (RTP_CAPS_STRING);
	gst_pad_set_caps (mysrcpad, caps);
	gst_caps_unref (caps);

	for (i = 0; i < num_buffers; i++) {
	buffer = gst_buffer_new_and_alloc (sizeof (in));
	gst_buffer_fill (buffer, 0, in, sizeof (in));
	GST_BUFFER_TIMESTAMP (buffer) = ts;
	GST_BUFFER_DURATION (buffer) = tso;
	gst_mini_object_weak_ref (GST_MINI_OBJECT (buffer), buffer_dropped, NULL);
	GST_DEBUG ("created buffer: %p", buffer);

	if (!i)
	GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);

	inbuffers = g_list_append (inbuffers, buffer);

	/* hackish way to update the rtp header */
	in[1] = 0x00;
	in[3]++; /* seqnumber */
	in[7] += RTP_FRAME_SIZE; /* inc. timestamp with framesize */
	ts += tso;
	}
	num_dropped = 0;

	return jitterbuffer;
	}

	static GstStateChangeReturn
	start_jitterbuffer (GstElement * jitterbuffer)
	{
	GstStateChangeReturn ret;
	GstClockTime now;
	GstClock *clock;

	clock = gst_element_get_clock (jitterbuffer);
	now = gst_clock_get_time (clock);
	gst_object_unref (clock);

	gst_element_set_base_time (jitterbuffer, now);
	ret = gst_element_set_state (jitterbuffer, GST_STATE_PLAYING);

	return ret;
	}

	static void
	cleanup_jitterbuffer (GstElement * jitterbuffer)
	{
	GST_DEBUG ("cleanup_jitterbuffer");

	g_list_foreach (buffers, (GFunc) gst_mini_object_unref, NULL);
	g_list_free (buffers);
	buffers = NULL;

	g_list_free (inbuffers);
	inbuffers = NULL;

	gst_pad_set_active (mysrcpad, FALSE);
	gst_pad_set_active (mysinkpad, FALSE);
	gst_check_teardown_src_pad (jitterbuffer);
	gst_check_teardown_sink_pad (jitterbuffer);
	gst_check_teardown_element (jitterbuffer);
	}

	static void
	check_jitterbuffer_results (GstElement * jitterbuffer, gint num_buffers)
	{
	GstBuffer *buffer;
	GList *node;
	GstClockTime ts = G_GUINT64_CONSTANT (0);
	GstClockTime tso = gst_util_uint64_scale (RTP_FRAME_SIZE, GST_SECOND, 8000);
	GstMapInfo map;
	guint16 prev_sn = 0, cur_sn;
	guint32 prev_ts = 0, cur_ts;

	/* sleep for twice the latency */
	g_usleep (400 * 1000);

	GST_INFO ("of %d buffer %d/%d received/dropped", num_buffers,
	g_list_length (buffers), num_dropped);
	/* if this fails, not all buffers have been processed */
	fail_unless_equals_int ((g_list_length (buffers) + num_dropped), num_buffers);

	/* check the buffer list */
	fail_unless_equals_int (g_list_length (buffers), num_buffers);
	for (node = buffers; node; node = g_list_next (node)) {
	fail_if ((buffer = (GstBuffer *) node->data) == NULL);
	fail_if (GST_BUFFER_TIMESTAMP (buffer) != ts);
	gst_buffer_map (buffer, &map, GST_MAP_READ);
	cur_sn = ((guint16) map.data[2] << 8) \| map.data[3];
	cur_ts = ((guint32) map.data[4] << 24) \| ((guint32) map.data[5] << 16) \|
	((guint32) map.data[6] << 8) \| map.data[7];
	gst_buffer_unmap (buffer, &map);

	if (node != buffers) {
	fail_unless (cur_sn > prev_sn);
	fail_unless (cur_ts > prev_ts);

	prev_sn = cur_sn;
	prev_ts = cur_ts;
	}
	ts += tso;
	}
	}

	GST_START_TEST (test_push_forward_seq)
	{
	GstElement *jitterbuffer;
	const guint num_buffers = 3;
	GstBuffer *buffer;
	GList *node;

	jitterbuffer = setup_jitterbuffer (num_buffers);
	fail_unless (start_jitterbuffer (jitterbuffer)
	== GST_STATE_CHANGE_SUCCESS, "could not set to playing");

	/* push buffers: 0,1,2, */
	for (node = inbuffers; node; node = g_list_next (node)) {
	buffer = (GstBuffer *) node->data;
	fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
	}

	/* check the buffer list */
	check_jitterbuffer_results (jitterbuffer, num_buffers);

	/* cleanup */
	cleanup_jitterbuffer (jitterbuffer);
	}

	GST_END_TEST;

	GST_START_TEST (test_push_backward_seq)
	{
	GstElement *jitterbuffer;
	const guint num_buffers = 4;
	GstBuffer *buffer;
	GList *node;

	jitterbuffer = setup_jitterbuffer (num_buffers);
	fail_unless (start_jitterbuffer (jitterbuffer)
	== GST_STATE_CHANGE_SUCCESS, "could not set to playing");

	/* push buffers: 0,3,2,1 */
	buffer = (GstBuffer *) inbuffers->data;
	fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
	for (node = g_list_last (inbuffers); node != inbuffers;
	node = g_list_previous (node)) {
	buffer = (GstBuffer *) node->data;
	fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
	}

	/* check the buffer list */
	check_jitterbuffer_results (jitterbuffer, num_buffers);

	/* cleanup */
	cleanup_jitterbuffer (jitterbuffer);
	}

	GST_END_TEST;

	GST_START_TEST (test_push_unordered)
	{
	GstElement *jitterbuffer;
	const guint num_buffers = 4;
	GstBuffer *buffer;

	jitterbuffer = setup_jitterbuffer (num_buffers);
	fail_unless (start_jitterbuffer (jitterbuffer)
	== GST_STATE_CHANGE_SUCCESS, "could not set to playing");

	/* push buffers; 0,2,1,3 */
	buffer = (GstBuffer *) inbuffers->data;
	fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
	buffer = g_list_nth_data (inbuffers, 2);
	fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
	buffer = g_list_nth_data (inbuffers, 1);
	fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
	buffer = g_list_nth_data (inbuffers, 3);
	fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);

	/* check the buffer list */
	check_jitterbuffer_results (jitterbuffer, num_buffers);

	/* cleanup */
	cleanup_jitterbuffer (jitterbuffer);
	}

	GST_END_TEST;

	GST_START_TEST (test_basetime)
	{
	GstElement *jitterbuffer;
	const guint num_buffers = 3;
	GstBuffer *buffer;
	GList *node;
	GstClockTime tso = gst_util_uint64_scale (RTP_FRAME_SIZE, GST_SECOND, 8000);

	jitterbuffer = setup_jitterbuffer (num_buffers);
	fail_unless (start_jitterbuffer (jitterbuffer)
	== GST_STATE_CHANGE_SUCCESS, "could not set to playing");

	/* push buffers: 2,1,0 */
	for (node = g_list_last (inbuffers); node; node = g_list_previous (node)) {
	buffer = (GstBuffer *) node->data;
	fail_unless (gst_pad_push (mysrcpad, buffer) == GST_FLOW_OK);
	}

	/* sleep for twice the latency */
	g_usleep (400 * 1000);

	/* if this fails, not all buffers have been processed */
	fail_unless_equals_int ((g_list_length (buffers) + num_dropped), num_buffers);

	buffer = (GstBuffer *) buffers->data;
	fail_unless (GST_BUFFER_TIMESTAMP (buffer) != (num_buffers * tso));

	/* cleanup */
	cleanup_jitterbuffer (jitterbuffer);
	}

	GST_END_TEST;


	static Suite *
	rtpjitterbuffer_suite (void)
	{
	Suite *s = suite_create ("rtpjitterbuffer");
	TCase *tc_chain = tcase_create ("general");

	suite_add_tcase (s, tc_chain);
	tcase_add_test (tc_chain, test_push_forward_seq);
	tcase_add_test (tc_chain, test_push_backward_seq);
	tcase_add_test (tc_chain, test_push_unordered);
	tcase_add_test (tc_chain, test_basetime);

	/* FIXME: test buffer lists */

	return s;
	}

	GST_CHECK_MAIN (rtpjitterbuffer);