[Bug 751450] parse/grammar.y: Allow multiple links to happen.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751450

Mathieu Duponchelle <mduponchelle1 at gmail.com> changed:

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 Attachment #306026|0                           |1
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--- Comment #7 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
Created attachment 306060
  --> https://bugzilla.gnome.org/attachment.cgi?id=306060&action=edit
parse/grammar.y: Allow multiple links to happen.

By introducing a new syntax : element1 ? element2

In such a case : uridecodebin ? encodebin ,
if the encodebin has multiple profiles compatible with the
decodebin, multiple links will be created.

With '!' , after one delayed link is successfully done, the
pad-added callback is disconnected.

The reason this isn't the default behaviour for '!' is legacy,
as it would make previously-working scripts malfunction.

This should be made the default behaviour at some point.

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