/* GStreamer
 *
 * unit test for theoraenc
 *
 * Copyright (C) 2006 Andy Wingo <wingo at pobox.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>

#define TIMESTAMP_OFFSET G_GINT64_CONSTANT(3249870963)
#define FRAMERATE 10

/* I know all of these have a shift of 6 bits */
#define GRANULEPOS_SHIFT 6

static GCond *cond = NULL;
static GMutex *lock = NULL;
static GstBuffer *buf = NULL;
static gulong id;

/* called for every buffer.  Waits until the global "buf" variable is unset,
 * then sets it to the buffer received, and signals. */
static gboolean
buffer_probe (GstPad * pad, GstBuffer * buffer, gpointer unused)
{
  g_mutex_lock (lock);

  while (buf != NULL)
    g_cond_wait (cond, lock);

  /* increase the refcount because we store it globally for others to use */
  buf = gst_buffer_ref (buffer);

  g_cond_signal (cond);

  g_mutex_unlock (lock);

  return TRUE;
}

static void
start_pipeline (GstElement * bin, GstPad * pad)
{
  id = gst_pad_add_buffer_probe (pad, G_CALLBACK (buffer_probe), NULL);

  cond = g_cond_new ();
  lock = g_mutex_new ();

  gst_element_set_state (bin, GST_STATE_PLAYING);

}

/* waits until the probe receives a buffer.  will catch every buffer */
static GstBuffer *
get_buffer (GstElement * bin, GstPad * pad)
{
  GstBuffer *ret;

  g_mutex_lock (lock);

  while (buf == NULL)
    g_cond_wait (cond, lock);

  ret = buf;
  buf = NULL;

  g_cond_signal (cond);

  g_mutex_unlock (lock);

  return ret;
}

static void
stop_pipeline (GstElement * bin, GstPad * pad)
{
  g_mutex_lock (lock);
  if (buf)
    gst_buffer_unref (buf);
  buf = NULL;
  gst_pad_remove_buffer_probe (pad, (guint) id);
  id = 0;
  g_cond_signal (cond);
  g_mutex_unlock (lock);

  gst_element_set_state (bin, GST_STATE_NULL);

  g_mutex_lock (lock);
  if (buf)
    gst_buffer_unref (buf);
  buf = NULL;
  g_mutex_unlock (lock);

  g_mutex_free (lock);
  g_cond_free (cond);

  lock = NULL;
  cond = NULL;
}

static void
check_buffer_timestamp (GstBuffer * buffer, GstClockTime timestamp)
{
  fail_unless (GST_BUFFER_TIMESTAMP (buffer) == timestamp,
      "expected timestamp %" GST_TIME_FORMAT
      ", but got timestamp %" GST_TIME_FORMAT,
      GST_TIME_ARGS (timestamp), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
}

static void
check_buffer_duration (GstBuffer * buffer, GstClockTime duration)
{
  fail_unless (GST_BUFFER_DURATION (buffer) == duration,
      "expected duration %" GST_TIME_FORMAT
      ", but got duration %" GST_TIME_FORMAT,
      GST_TIME_ARGS (duration), GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
}

static void
check_buffer_granulepos (GstBuffer * buffer, GstClockTime granulepos)
{
  fail_unless (GST_BUFFER_OFFSET_END (buffer) == granulepos,
      "expected granulepos %" G_GUINT64_FORMAT
      ", but got granulepos %" G_GUINT64_FORMAT,
      granulepos, GST_BUFFER_OFFSET_END (buffer));
}

/* this check is here to check that the granulepos we derive from the
   timestamp is about correct. This is "about correct" because you can't
   precisely go from timestamp to granulepos due to the downward-rounding
   characteristics of gst_util_uint64_scale, so you check if granulepos is
   equal to the number, or the number plus one. */
/* should be from_endtime, but theora's granulepos mapping is "special" */
static void
check_buffer_granulepos_from_starttime (GstBuffer * buffer,
    GstClockTime starttime)
{
  GstClockTime granulepos, expected, framecount;

  granulepos = GST_BUFFER_OFFSET_END (buffer);
  framecount = granulepos >> GRANULEPOS_SHIFT;
  framecount += granulepos & ((1 << GRANULEPOS_SHIFT) - 1);
  expected = gst_util_uint64_scale (starttime, FRAMERATE, GST_SECOND);

  fail_unless (framecount == expected || framecount == expected + 1,
      "expected frame count %" G_GUINT64_FORMAT
      " or %" G_GUINT64_FORMAT
      ", but got frame count %" G_GUINT64_FORMAT,
      expected, expected + 1, granulepos);
}

GST_START_TEST (test_granulepos_offset)
{
  GstElement *bin;
  GstPad *pad;
  gchar *pipe_str;
  GstBuffer *buffer;
  GError *error = NULL;
  GstClockTime timestamp;

  pipe_str = g_strdup_printf ("videotestsrc timestamp-offset=%" G_GUINT64_FORMAT
      " ! video/x-raw-yuv,format=(fourcc)I420,framerate=10/1"
      " ! theoraenc ! fakesink", TIMESTAMP_OFFSET);

  bin = gst_parse_launch (pipe_str, &error);
  fail_unless (bin != NULL, "Error parsing pipeline: %s",
      error ? error->message : "(invalid error)");
  g_free (pipe_str);

  /* get the pad */
  {
    GstElement *sink = gst_bin_get_by_name (GST_BIN (bin), "fakesink0");

    fail_unless (sink != NULL, "Could not get fakesink out of bin");
    pad = gst_element_get_pad (sink, "sink");
    fail_unless (pad != NULL, "Could not get pad out of fakesink");
    gst_object_unref (sink);
  }

  start_pipeline (bin, pad);

  /* header packets should have timestamp == NONE, granulepos 0 */
  buffer = get_buffer (bin, pad);
  check_buffer_timestamp (buffer, GST_CLOCK_TIME_NONE);
  check_buffer_duration (buffer, GST_CLOCK_TIME_NONE);
  check_buffer_granulepos (buffer, 0);
  gst_buffer_unref (buffer);

  buffer = get_buffer (bin, pad);
  check_buffer_timestamp (buffer, GST_CLOCK_TIME_NONE);
  check_buffer_duration (buffer, GST_CLOCK_TIME_NONE);
  check_buffer_granulepos (buffer, 0);
  gst_buffer_unref (buffer);

  buffer = get_buffer (bin, pad);
  check_buffer_timestamp (buffer, GST_CLOCK_TIME_NONE);
  check_buffer_duration (buffer, GST_CLOCK_TIME_NONE);
  check_buffer_granulepos (buffer, 0);
  gst_buffer_unref (buffer);

  {
    GstClockTime next_timestamp, last_granulepos;

    /* first buffer should have timestamp of TIMESTAMP_OFFSET, granulepos to
     * match the timestamp of the end of the last sample in the output buffer.
     * Note that one cannot go timestamp->granulepos->timestamp and get the
     * same value due to loss of precision with granulepos. theoraenc does
     * take care to timestamp correctly based on the offset of the input data
     * however, so it does do sub-granulepos timestamping. */
    buffer = get_buffer (bin, pad);
    last_granulepos = GST_BUFFER_OFFSET_END (buffer);
    check_buffer_timestamp (buffer, TIMESTAMP_OFFSET);
    /* don't really have a good way of checking duration... */
    check_buffer_granulepos_from_starttime (buffer, TIMESTAMP_OFFSET);

    next_timestamp = TIMESTAMP_OFFSET + GST_BUFFER_DURATION (buffer);

    gst_buffer_unref (buffer);

    /* check continuity with the next buffer */
    buffer = get_buffer (bin, pad);
    check_buffer_timestamp (buffer, next_timestamp);
    check_buffer_duration (buffer,
        gst_util_uint64_scale (GST_BUFFER_OFFSET_END (buffer), GST_SECOND,
            FRAMERATE)
        - gst_util_uint64_scale (last_granulepos, GST_SECOND, FRAMERATE));
    check_buffer_granulepos_from_starttime (buffer, next_timestamp);

    gst_buffer_unref (buffer);
  }

  stop_pipeline (bin, pad);

  gst_object_unref (pad);
  gst_object_unref (bin);
}

GST_END_TEST;

GST_START_TEST (test_continuity)
{
  GstElement *bin;
  GstPad *pad;
  gchar *pipe_str;
  GstBuffer *buffer;
  GError *error = NULL;
  GstClockTime timestamp;

  pipe_str = g_strdup_printf ("videotestsrc"
      " ! video/x-raw-yuv,format=(fourcc)I420,framerate=10/1"
      " ! theoraenc ! fakesink");

  bin = gst_parse_launch (pipe_str, &error);
  fail_unless (bin != NULL, "Error parsing pipeline: %s",
      error ? error->message : "(invalid error)");
  g_free (pipe_str);

  /* get the pad */
  {
    GstElement *sink = gst_bin_get_by_name (GST_BIN (bin), "fakesink0");

    fail_unless (sink != NULL, "Could not get fakesink out of bin");
    pad = gst_element_get_pad (sink, "sink");
    fail_unless (pad != NULL, "Could not get pad out of fakesink");
    gst_object_unref (sink);
  }

  start_pipeline (bin, pad);

  /* header packets should have timestamp == NONE, granulepos 0 */
  buffer = get_buffer (bin, pad);
  check_buffer_timestamp (buffer, GST_CLOCK_TIME_NONE);
  check_buffer_duration (buffer, GST_CLOCK_TIME_NONE);
  check_buffer_granulepos (buffer, 0);
  gst_buffer_unref (buffer);

  buffer = get_buffer (bin, pad);
  check_buffer_timestamp (buffer, GST_CLOCK_TIME_NONE);
  check_buffer_duration (buffer, GST_CLOCK_TIME_NONE);
  check_buffer_granulepos (buffer, 0);
  gst_buffer_unref (buffer);

  buffer = get_buffer (bin, pad);
  check_buffer_timestamp (buffer, GST_CLOCK_TIME_NONE);
  check_buffer_duration (buffer, GST_CLOCK_TIME_NONE);
  check_buffer_granulepos (buffer, 0);
  gst_buffer_unref (buffer);

  {
    GstClockTime next_timestamp, last_granulepos;

    /* first buffer should have timestamp of TIMESTAMP_OFFSET, granulepos to
     * match the timestamp of the end of the last sample in the output buffer.
     * Note that one cannot go timestamp->granulepos->timestamp and get the
     * same value due to loss of precision with granulepos. theoraenc does
     * take care to timestamp correctly based on the offset of the input data
     * however, so it does do sub-granulepos timestamping. */
    buffer = get_buffer (bin, pad);
    last_granulepos = GST_BUFFER_OFFSET_END (buffer);
    check_buffer_timestamp (buffer, 0);
    /* plain division because I know the answer is exact */
    check_buffer_duration (buffer, GST_SECOND / 10);
    check_buffer_granulepos (buffer, 0);

    next_timestamp = GST_BUFFER_DURATION (buffer);

    gst_buffer_unref (buffer);

    /* check continuity with the next buffer */
    buffer = get_buffer (bin, pad);
    check_buffer_timestamp (buffer, next_timestamp);
    check_buffer_duration (buffer, GST_SECOND / 10);
    check_buffer_granulepos (buffer, 1);

    gst_buffer_unref (buffer);
  }

  stop_pipeline (bin, pad);

  gst_object_unref (pad);
  gst_object_unref (bin);
}

GST_END_TEST;

Suite *
theoraenc_suite (void)
{
  Suite *s = suite_create ("theoraenc");
  TCase *tc_chain = tcase_create ("general");

  suite_add_tcase (s, tc_chain);
  tcase_add_test (tc_chain, test_granulepos_offset);
  tcase_add_test (tc_chain, test_continuity);

  return s;
}

int
main (int argc, char **argv)
{
  int nf;

  Suite *s = theoraenc_suite ();
  SRunner *sr = srunner_create (s);

  gst_check_init (&argc, &argv);

  srunner_run_all (sr, CK_NORMAL);
  nf = srunner_ntests_failed (sr);
  srunner_free (sr);

  return nf;
}