public static readonly ulong Second = 1000000000;
public static readonly ulong MSecond = 1000000;
public static readonly ulong USecond = 1000;
public static readonly ulong NSecond = 1;
public static readonly ulong TimeNone = 0xffffffffffffffff;

public static bool TimeIsValid (ulong time) {
  return (time != TimeNone);
}

[DllImport ("gstreamersharpglue-0.10.dll") ]
extern static uint gstsharp_gst_clock_get_entries_changed_offset ();

static uint entries_changed_offset = gstsharp_gst_clock_get_entries_changed_offset ();
private IntPtr EntriesChangedPtr {
  get {
    unsafe {
      IntPtr* raw_ptr = (IntPtr*) ( ( (byte*) Handle) + entries_changed_offset);
      return (*raw_ptr);
    }
  }
}

[DllImport ("libglib-2.0-0.dll") ]
static extern void g_cond_wait (IntPtr cond, IntPtr mutex);
[DllImport ("libglib-2.0-0.dll") ]
static extern bool g_cond_timed_wait (IntPtr cond, IntPtr mutex, ref _TimeVal abs_time);
[DllImport ("libglib-2.0-0.dll") ]
static extern void g_cond_broadcast (IntPtr cond);

public void Wait () {
  g_cond_wait (EntriesChangedPtr, LockPtr);
}

[StructLayout (LayoutKind.Sequential) ]
private struct _TimeVal {
  public IntPtr sec;
  public IntPtr usec;
}

public bool Wait (uint mseconds) {
  _TimeVal tv = new _TimeVal ();
  long sec = mseconds / 1000;
  long usec = 1000 * (mseconds - sec * 1000);
  tv.sec = (IntPtr) (sec);
  tv.usec = (IntPtr) (usec);
  return g_cond_timed_wait (EntriesChangedPtr, LockPtr, ref tv);
}

public bool Wait (TimeSpan timespan) {
  _TimeVal tv = new _TimeVal ();
  long sec = (long) timespan.TotalSeconds;
  long usec = 1000 * ( ( (long) timespan.TotalMilliseconds) - sec * 1000);
  tv.sec = (IntPtr) (sec);
  tv.usec = (IntPtr) (usec);
  return g_cond_timed_wait (EntriesChangedPtr, LockPtr, ref tv);
}

public void Broadcast () {
  g_cond_broadcast (EntriesChangedPtr);
}

[DllImport ("gstreamersharpglue-0.10.dll") ]
extern static uint gstsharp_gst_clock_get_slave_lock_offset ();

static uint slave_lock_offset = gstsharp_gst_clock_get_slave_lock_offset ();
private IntPtr SlaveLockPtr {
  get {
    unsafe {
      IntPtr* raw_ptr = (IntPtr*) ( ( (byte*) Handle) + slave_lock_offset);
      return (*raw_ptr);
    }
  }
}

[DllImport ("libglib-2.0-0.dll") ]
static extern void g_mutex_lock (IntPtr mutex);
[DllImport ("libglib-2.0-0.dll") ]
static extern void g_mutex_unlock (IntPtr mutex);
[DllImport ("libglib-2.0-0.dll") ]
static extern bool g_mutex_trylock (IntPtr mutex);

public void SlaveLock () {
  g_mutex_lock (SlaveLockPtr);
}

public void SlaveUnlock () {
  g_mutex_unlock (SlaveLockPtr);
}

public bool TrySlaveLock () {
  return g_mutex_trylock (SlaveLockPtr);
}

[DllImport("libgstreamer-0.10.dll") ]
static extern IntPtr gst_clock_get_master (IntPtr raw);
[DllImport("libgstreamer-0.10.dll") ]
static extern bool gst_clock_set_master (IntPtr raw, IntPtr master);
public Gst.Clock Master {
  get  {
    IntPtr raw_ret = gst_clock_get_master (Handle);
    Gst.Clock ret = Gst.GLib.Object.GetObject (raw_ret, true) as Gst.Clock;
    return ret;
  }
  set {
    if (!gst_clock_set_master (Handle, value == null ? IntPtr.Zero : value.Handle))
      throw new Exception ();
  }
}

[DllImport ("gstreamersharpglue-0.10.dll") ]
extern static uint gstsharp_gst_clock_get_entries_offset ();

static uint entries_offset = gstsharp_gst_clock_get_entries_offset ();
private IntPtr EntriesPtr {
  get {
    unsafe {
      IntPtr* raw_ptr = (IntPtr*) ( ( (byte*) Handle) + entries_offset);
      return (*raw_ptr);
    }
  }
}

protected Gst.ClockEntry[] Entries {
  get {
    return (Gst.ClockEntry[]) Gst.GLib.Marshaller.ListPtrToArray (EntriesPtr, typeof (Gst.GLib.List), false, false, typeof (Gst.ClockEntry));
  }
}

[DllImport ("gstreamersharpglue-0.10.dll") ]
extern static uint gstsharp_gst_clock_get_times_offset ();

static uint times_offset = gstsharp_gst_clock_get_times_offset ();
private IntPtr TimesPtr {
  get {
    unsafe {
      IntPtr* raw_ptr = (IntPtr*) ( ( (byte*) Handle) + times_offset);
      return (*raw_ptr);
    }
  }
}

protected ulong[] Times {
  get {
    ulong[] ret = new ulong[4 * WindowSize];
    for (int i = 0; i < 4 * WindowSize; i++)
      ret[i] = (ulong) Marshal.ReadInt64 (TimesPtr, 8 * i);
    return ret;
  }
}