[Bug 770698] New: video-orc.orc doesn't compile with orc 0.4.23

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770698

            Bug ID: 770698
           Summary: video-orc.orc doesn't compile with orc 0.4.23
    Classification: Platform
           Product: GStreamer
           Version: 1.9.1
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ap.jonathan.miles at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Building a recent gst-plugins-base (fb9bddd81e08925b329430a0ede9f8e2ef8a0bc5)
fails with:

orcc --compat 0.4.23 --implementation --include glib.h -o tmp-orc.c
gst-libs/gst/video/video-orc.orc
| ORC: ERROR: orc-0.4.23/orc/orcbytecode.c(251): bytecode_append_int():
assertion failed: value >= 0
| In function video_orc_convert_I420_BGRA:
| error: variable "(null)" used before being written
| In function video_orc_convert_I420_ARGB:
| error: variable "(null)" used before being written
| Failed to compile no orc for 'video_orc_convert_I420_BGRA'
| Failed to compile backup code for 'video_orc_convert_I420_BGRA'

The offending instruction appears to be 'x4 addb argb, x, c4128', which was
introduced in: a12f51c video-converter: add more fastpaths for I420 -> RGB

Upgrading to orc 0.4.25 fixes the problem.

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