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Commit ef5f8e25 authored by Vincent Penquerc'h's avatar Vincent Penquerc'h
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oggdemux: fix broken seeking reading the whole file

A change in gst_ogg_demux_do_seek caused oggdemux to wait for
a page for each of the streams, including a skeleton stream if
one was present. Since Skeleton only has header pages, that
was never going to end well.

Also, the code was skipping CMML streams when looking for pages,
so would also have broken on CMML streams.

Thus, we change the code to disregard Skeleton streams, as well
as discontinuous streams (such as CMML and Kate). While it may
be desirable to consider Kate streams too (in order to avoid
losing a subtitle starting near the seek point), this may be
a performance drag when seeking where no subtitles are. Maybe
one could add a "give up" threshold for such discontinuous
streams, so we'd get any page if there is one, but do not end
up reading preposterous amounts of data otherwise.

In any case, it is important that the code that determines
the amount of streams to look pages for remains consistent with
the "early out" conditions of the code that actually parses
the incoming pages, lest we never decrease the pending counter
to zero.

This fixes seeking on a file with a skeleton track reading all
the file on each seek.

https://bugzilla.gnome.org/show_bug.cgi?id=719615
parent 1493427a
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