[Bug 790057] New: waylandsink does not respect video alignment from upstream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790057

            Bug ID: 790057
           Summary: waylandsink does not respect video alignment from
                    upstream
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: rawoul at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Hi,

waylandsink's own SHM buffer allocator is exposed using a GstVideoBufferPool,
which allows upstream to set a video alignment in buffers. However, the
alignment of such buffers (for example set by ffmpeg based decoders) is
ignored, so the result on screen is wrong.

Support for video alignment could be implemented by allocating SHM buffers that
account for padding in the buffer width and height, and then use the
wp_viewport extension to crop the buffer to the visible width and height.

Testing with weston might also require the following patch (not yet merged):
https://patchwork.freedesktop.org/patch/180767/

To reproduce simply decode a video directly to waylandsink using an ffmpeg
based decoder, for example:

gst-launch-1.0 filesrc location=/path/to/video.avi ! avidemux ! avdec_mpeg4 !
waylandsink

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