static bool TickCb()
{
if (_sinks.Count == 0 || random.Next() % 2 == 0)
{
SinkStruct sink = new SinkStruct();
PadTemplate templ = _tee.GetPadTemplate("src_%u");
Console.Write("Add ... ");
sink.teePad = _tee.RequestPad(templ);
sink.queue = ElementFactory.Make("queue");
sink.conv = ElementFactory.Make("videoconvert");
sink.sink = ElementFactory.Make("autovideosink");
sink.removing = 0;
_pipeline.Add(sink.queue, sink.conv, sink.sink);
if (!Element.Link(sink.queue, sink.conv, sink.sink))
{
"Cannot link elements".PrintErr();
return(false);
}
sink.queue.SyncStateWithParent();
sink.conv.SyncStateWithParent();
sink.sink.SyncStateWithParent();
using (var sinkPad = sink.queue.GetStaticPad("sink"))
{
sink.teePad.Link(sinkPad);
}
Console.WriteLine("added");
_sinks.AddLast(sink);
}
else
{
Console.Write("remove ... ");
var sink = _sinks.Last.Value;
_sinks.RemoveLast();
sink.teePad.AddProbe(PadProbeType.Idle, GetUnlinkCb(sink));
}
return(true);
}
static PadProbeCallback GetUnlinkCb(object userData)
{
SinkStruct sink = (SinkStruct)userData;
PadProbeReturn UnlinkCb(Pad pad, PadProbeInfo info)
{
if (Interlocked.CompareExchange(ref sink.removing, 0, 1) == 1)
{
return(PadProbeReturn.Ok);
}
using (var sinkPad = sink.queue.GetStaticPad("sink"))
{
sink.teePad.Unlink(sinkPad);
}
_pipeline.Remove(sink.queue);
_pipeline.Remove(sink.conv);
_pipeline.Remove(sink.sink);
sink.sink.SetState(State.Null);
sink.conv.SetState(State.Null);
sink.queue.SetState(State.Null);
sink.queue.Dispose();
sink.conv.Dispose();
sink.sink.Dispose();
_tee.ReleaseRequestPad(sink.teePad);
sink.teePad.Dispose();
Console.WriteLine("removed");
return(PadProbeReturn.Remove);
}
return(UnlinkCb);
}
