[Bug 747574] videodecoder: reverse playback in non-packetized decoders

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747574

Jan Schmidt <thaytan at noraisin.net> changed:

           What    |Removed                     |Added
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                 CC|                            |thaytan at noraisin.net

--- Comment #6 from Jan Schmidt <thaytan at noraisin.net> ---
No, you've misunderstood. Videodecoder gathers an entire GOP, decodes it
*forwards* (as it has to, it can't decode in reverse in general). When it
reaches the end of the GOP, it pushes each decoded frame out in reverse order.

When there are B-frames, we could do better, since with some decoder
implementations B-frames could be decoded 'just in time' using existing
reference frames and decoding only the B-frames in reverse and outputting them
immediately - but it's still possible we'd run out of surfaces.

In short, we need a mechanism to cope with surface exhaustion deadlock, one way
or another.

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