[Bug 784069] Add support for OMX_UseBuffer in gstomxvideodec

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784069

Julien Isorce <julien.isorce at gmail.com> changed:

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--- Comment #10 from Julien Isorce <julien.isorce at gmail.com> ---
Comment on attachment 355424
  --> https://bugzilla.gnome.org/attachment.cgi?id=355424
omxvideodec: can use OMX_UseBuffer

commit 80c6dd46a1e290716cc22e23ffdf076ea69a775a
Author: Julien Isorce <jisorce at oblong.com>
Date:   Thu Jun 29 22:48:47 2017 +0100

    omxvideodec: use OMX_UseBuffer

    For example this allows the omx decoder to directly fill the
    pixmaps coming from the video sink.

    It only avoids a buffer copy when the decoder uses a pool provided
    by a downstream element. So let's restrict this usage to situations
    where the decoder decides to use a downstream buffer pool.

    Tested with Tizonia/OMX.Aratelia.video_decoder.vp8
    and with Bellagio/OMX.mesa.video_decoder.avc.

    If it fails to setup buffers with OMX_UseBuffer the decoders
    fallbacks to usual OMX_AllocateBuffer.

    Also it allows to test on desktop the GstOMXBufferPool->other_pool
    management which was previously only used in the OMX_UseEGLImage
    case, i.e. on Rpi.

    https://bugzilla.gnome.org/show_bug.cgi?id=784069

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