[Bug 97116] mpv needs VAAPI_DISABLE_INTERLACE=1 for swdecode -vo vaapi since st/va: add conversion for yv12 to nv12in putimage v2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97116

            Bug ID: 97116
           Summary: mpv needs VAAPI_DISABLE_INTERLACE=1 for swdecode  -vo
                    vaapi since st/va: add conversion for yv12 to nv12in
                    putimage v2
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: adf.lists at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

since 

mesa commit     34f46348438b29e20d06cca312616cfba8ee05f6

For putimage call, if image format is yv12 (or IYUV with U V field swap) and
surface format is nv12, then we need to convert yv12 to nv12 and then copy the
converted data from image to surface. We can't use the existing logic where
surface is destroyed and re-created with yv12 format.

v2 (chk): fix some compiler warnings and commit message 

mpv --vo=vaapi will produce corrupted output without the new env
VAAPI_DISABLE_INTERLACE=1

This only applies to s/w decode as hwdec uses nv12 and avoids the conversion.

Gstreamer vaapisink is not affected as (from what little debugging I did) it
doesn't seem to use interlaced buffers doing putimage.

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