[Bug 783085] New: Need API to know allocated buffers from upstream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783085

            Bug ID: 783085
           Summary: Need API to know allocated buffers from upstream
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gdesmott at gnome.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

We are working on implementing DMA support in gst-omx. When acting as a DMA
importer, an element needs to know beforehand which buffers have been allocated
upstream so it can call OMX_UseBuffer() on each allocated buffer it's going to
use.

We currently solved this using a custom downstream event sent in
gst_v4l2src_decide_allocation() but it would be good to have a proper solution
for this.

We could add a "allocated-buffers" serialized downstream event which is sent
when buffers are (re)allocated before starting to use them.
It would include a GPtrArray of GstBuffers.
We should probably be clear in the doc on what can and cannot be done with
those buffers. Something like "Those buffers should not be modified in anyway."

Thoughts?

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