[Bug 770158] element: Add API to more easily posting messages about flowing issues

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770158

Thibault Saunier <tsaunier at gnome.org> changed:

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--- Comment #3 from Thibault Saunier <tsaunier at gnome.org> ---
Created attachment 333709
  --> https://bugzilla.gnome.org/attachment.cgi?id=333709&action=edit
element: Add API to more easily post messages about flowing issues

In many parts of the code we raise streaming error when the flow
goes wrong, and each time we create more or less similare error
message. Also that message does not let the application know what
has actually gone wrong. In the new API we add a "flow-return" detail
field inside the GstMessage so that the application has all the information
if it needs it.

And make use of it everywhere it makes sense.

API:
    GST_ELEMENT_FLOW_ERROR

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