[Bug 768248] New: vaapiencode: Add Encoding region-of-interest (ROI) support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768248

            Bug ID: 768248
           Summary: vaapiencode: Add Encoding region-of-interest (ROI)
                    support
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bsreerenj at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Add support for QP adjustments in specific(user provided) areas of the frames
when encoding.

ROIs can be set through the VAENCMiscParameterBufferROIs. The ROI set through
this structure is applicable only to the current frame/field, so must be sent
every frame/field to be applied.  The number of supported ROIs can be queried
through the VAConfigAttribEncROI.  The encoder will use the ROI information to
adjust the QP values of the MB's that fall within the ROIs.

This feature is for giving more control to the user in order to tune the encode
quality.

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