[libbluray-devel] JRE for Android part 3

[Petri Hintukainen]

la, 2021-01-30 kello 14:27 -0300, Vitor Dall'Acqua kirjoitti:
> Also, Petri, do you think you could share the changes you made
> on JRE to allow it to run without JAVA_HOME?

Attached.

Source tree was from:
git clone --depth 1
https://github.com/PojavLauncherTeam/openjdk-aarch64-jdk8u openjdk

I think the other changes I did are not needed if you preload the
libraries (those were required to get it loaded in Ubuntu / x86_64).

Preloading is weird and quite hacky. And those libraries are never
closed. I don't know if it belongs to libbluray. Maybe if it was just
one, consistent library. But definetely not blindly all libraries in
lib/ folder.

If JVM doesn't find the libraries, it cold be fixable with -
Djava.library.path (or simliar) or LD_LIBRARY_PATH. If JVM doesn't try
loading those, it is bug in java files.

If we can't get it loading properly, preloading could be done in Kodi
or in libjvm.so wrapper library. It is specific to this one JVM and/or
configuration.

> And did you create a make file to compile it? Or did it by hand?

There are build scripts in
https://github.com/PojavLauncherTeam/android-openjdk-build-multiarch.git

> And finally, the changes needed on libbluray are just a few lines of
> code on bdj.c.
> Do you think a #ifdef android would be a good idea?

For generic, android specific parts, yes.
If there are some App / Kodi specific things (like paths), we need to
add some way to configure those build-time and/or runtime.

> I believe that even VLC could play full disks on Android too.

Depends on the device. This requires some kind of keyboard or remote
controller (BD-J can't be used with touch screen). In "normal" phone or
tablet the user would be stuck in the first BD-J menu.
So we need some kind of virtual remote controller for those devices.
Either on-screen "keypad", or translating gestures to key events.

(almost all HDMV menus should be usable with touch screen / mouse).


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