[Bug 782774] kmssink: drop last rendered buffer on ALLOCATION and DRAIN queries

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782774

Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> changed:

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--- Comment #11 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 355015
  --> https://bugzilla.gnome.org/attachment.cgi?id=355015&action=edit
kmssink: drop last rendered buffer on ALLOCATION and DRAIN queries

kmssink keeps a reference on the last rendered buffer. If this buffer
refers to an upstream buffer, it should be should be released on DRAIN
and ALLOCATION queries so all upstream buffers can be returned to the
pool if needed. As the buffer may be used for scanout, we copy this
buffer into a dumb buffer prior to let it go.

Based on patch from Guillaume Desmottes <guillaume.desmottes at collabora.com>

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