[Bug 761059] kmssink: add new plugin and element

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761059

--- Comment #33 from Philipp Zabel <p.zabel at pengutronix.de> ---
When not using dmabuf, I see kmssink add and alternate between two drm
framebuffers:

gst_kms_sink_show_frame:<kmssink0> displaying fb 62
gst_kms_sink_show_frame:<kmssink0> displaying fb 63
gst_kms_sink_show_frame:<kmssink0> displaying fb 62
gst_kms_sink_show_frame:<kmssink0> displaying fb 63
...

But when using dmabuf, the first fb gets removed by
gst_allocator_memory_reset() called from gst_kms_allocator_dmabuf_import() and
it keeps displaying the same fb, as the gst_buffer_pool_acquire_buffer() call
in gst_kms_sink_get_input_buffer() keeps returning the same destination buffer:

gst_kms_allocator_dmabuf_import:<KMSMemory::allocator> resetting bo-based
buffer
gst_kms_sink_import_dmabuf:<kmssink0> imported prime fd 43
gst_kms_sink_show_frame:<kmssink0> displaying fb 62
gst_kms_sink_import_dmabuf:<kmssink0> imported prime fd 45
gst_kms_sink_show_frame:<kmssink0> displaying fb 62
gst_kms_sink_import_dmabuf:<kmssink0> imported prime fd 47
gst_kms_sink_show_frame:<kmssink0> displaying fb 62
gst_kms_sink_import_dmabuf:<kmssink0> imported prime fd 43
...

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