/* 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, 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 mem)
{
  if (mem) {
    GST_DEBUG ("dropping buffer: data=%p", mem);
    g_free (mem);
    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 ("gstrtpjitterbuffer");
  /* 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, NULL);
  mysinkpad = gst_check_setup_sink_pad (jitterbuffer, &sinktemplate, NULL);
  gst_pad_set_active (mysrcpad, TRUE);
  gst_pad_set_active (mysinkpad, TRUE);

  /* create n buffers */
  caps = gst_caps_from_string (RTP_CAPS_STRING);
  for (i = 0; i < num_buffers; i++) {
    buffer = gst_buffer_new_and_alloc (sizeof (in));
    memcpy (GST_BUFFER_DATA (buffer), in, sizeof (in));
    gst_buffer_set_caps (buffer, caps);
    GST_BUFFER_TIMESTAMP (buffer) = ts;
    GST_BUFFER_DURATION (buffer) = tso;
    GST_BUFFER_FREE_FUNC (buffer) = buffer_dropped;
    GST_DEBUG ("created buffer: %p, data=%p", buffer, GST_BUFFER_DATA (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;
  }
  gst_caps_unref (caps);
  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);
  guint8 *data;
  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);
    data = GST_BUFFER_DATA (buffer);
    cur_sn = ((guint16) data[2] << 8) | data[3];
    cur_ts = ((guint32) data[4] << 24) | ((guint32) data[5] << 16) |
        ((guint32) data[6] << 8) | data[7];

    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);