[Bug 795243] New: libav: re-enable neon optimizations for arm/armv7 on android

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795243

            Bug ID: 795243
           Summary: libav: re-enable neon optimizations for arm/armv7 on
                    android
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: cerbero
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: rahulchaudhry at chromium.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 370915
  --> https://bugzilla.gnome.org/attachment.cgi?id=370915&action=edit
patch to ffmpeg for avoiding conditional branch to PLT in THUMB-2

Neon optimizations are disabled for libav (see
https://bugzilla.gnome.org/show_bug.cgi?id=793980).

See https://github.com/android-ndk/ndk/issues/337 for background.

The current workaround is to disable neon during gstreamer build.

The commit to disable the optimizations is
https://github.com/freedesktop/gstreamer-cerbero/commit/41556c415739fbc3a72c7eaee7e70a565b719b2f

I've sent a patch to upstream ffmpeg that should resolve the linker issue
(conditional branch to PLT in THUMB-2).
The patch is here:
http://ffmpeg.org/pipermail/ffmpeg-devel/2018-April/228246.html (also attached
with this bug).

Once this patch makes it into the copy of ffmpeg used in gstreamer build, neon
optimizations can be re-enabled.

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