Seamless playback without playbin

[marcin at saepia.net]

Hi,

I have pipeline with two branches, and I need to switch them dynamically
without any gaps.

Each branch is basically

filesrc -> decodebin -> audioresample -> audioconvert -> capsfilter

put in a bin where bin's src ghost pad is made out of capsfilter's src pad.

I have EVENT_BOTH pad probe on capsfilter's src pad and I listen for EOS.

When EOS happens, another branch is always prepared for playback, I mean it
is in PLAYING state but bin's src pad is blocked.

In callback for EOS I immediately unlink EOSed bin, link another one and
remove blocking pad probe for the newly linked branch.

Sound plays, but there are tiny gaps between files.

What else should I do in order to achieve gapless playback?

I cannot use playbin (finally final pipeline will be much more complex and
much more different from playbin purpose than in this case).

Thanks,

m.
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