Gapless Playback Pipeline Problem

[David Griffin]

I'm trying to recreate what this person does with his concatenation element
that will be in 1.6:
https://coaxion.net/blog/2014/08/concatenate-multiple-streams-gaplessly-with-gstreamer/

In a pad probe on the EOS event of a sink pad, I block the source pad of
the pad before that sink pad and then I block the sink pad. Then, I unlink
the same two pads. The element before the sink pad is a bin of many
elements. I then remove the bin from the pipeline and put it in a linked
list for disposal outside the probe. Then, I insert a bin that is a
prerolled bin of elements like the one that was removed from the pipeline.
The new bin was created using the same function I used to create the part I
removed. The song before it plays successfully. I lastly set the prerolled
bin to a playing state from paused. All of seems to work successfully to
the point I described. The problem is when I try to link the pads of those
two elements, the main thread locks up. I’m not sure why and debug info
isn’t giving me and useful information. Here’s a graph of my pipeline
directly before trying to link those two pads:
http://i.imgur.com/6PYDlAU.png

I also tried doing all of that in a function run using g_idle_add so it is
asynchronous, but I get the same deadlock result when linking the two pads.
Here is my code:
https://drive.google.com/file/d/0B9XMbfqJukNfUEVSQzBNQzd3N2c/view?usp=sharing

The relevant code is at 556 and the deadlocking pad link occurs at 707.


-DJ G.
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