[libbluray-devel] Found a JRE compiled for Android (ARM)

[Vitor Dall'Acqua]

Really glad to hear back on this.

Exactly, having libbluray running on Kodi on Android would make many people
happy.

Alas, this is not my first time attempting this and failing.

It would make things much simpler if would be possible to just embed jre
into libbluray when compiling but that probably violates several license
agreements.

Right now, I'm still working on libbluray and Kodi with a different issue,
actually the only remaining issue with bluray and bluray uhd playback on
Kodi using libbluray (on linux and windows).

Kodi has 2 states when playing a disc: inside a menu and playback.
The problem I'm facing is the popup menus, which causes Kodi to behave as
if it's inside a menu during entire playback.

I need to figure out a way to get any value when the popup menu isn't
rendering on screen.

BD_EVENT_POPUP doesn't change.
All the axis, img byte size, the palette, still can't figure out anything
that I can use.

Do you have advice of what can be used for this?

This would greatly improve the user experience using Kodi and full discs.

Either way, thank you for taking your time to answer this.

Regards
Vitor




On Wed, Jan 20, 2021, 7:11 PM Shaya Potter <spotter at gmail.com> wrote:

> I can't speak to any specifics, but there are some obvious issues that
> would prevent libbluray from loading it.
>
> libbluray searches for the the java root dir in a number of places
> (including the JAVA_HOME env)
>
> from the root dir, it searches in a number of subdir's for libjvm.so
>
> the dirs it searches are
>
>     static const char * const jvm_dir[]  = {"jre/lib/" JAVA_ARCH "/server",                                            "lib/server",                                            "lib/client",
>
>
> it turns out that none of those dirs are where this jvm stores libjvm.so.
> it stores it in "lib/arm/client".
>
> hence it can't find it.  a simple experiment would be for you to build
> your own libbluray and add "lib/arm/client" or perhaps even "lib" JAVA_ARCH
> "/client" (again, unsure) and see if that improves the situation.
>
> with that said, I have some skepticism that it can work when loaded into
> the shared data partition as google has gone through efforts to lock down
> executable code being stored there, with that said, I don't know how that
> impact dlopen and the like and might only impact Android Q users.
>
> but again, this is just low hanging fruit issues, dont really know what it
> would be.  (with that said, I think the holy grail for many people would be
> to have kodi be able to use java on android).
>
> The other issue is that these devs don't provide any source code for the
> jvm that they built.  as it's under the GPL and they aren't providing
> sources they built it from, they are arguably in violation of the license.
> that's going to prevent it from anyone putting significant effort into it.
>
>
> On Sat, Jan 2, 2021 at 4:35 AM Vitor Dall'Acqua <veggav at gmail.com> wrote:
>
>> Just wanted to share this with you,
>>
>> Someone made a JRE for Termux that runs on Android devices.
>> https://github.com/MasterDevX/Termux-Java
>>
>> I've tried to add this to Kodi and setenv
>>   setenv("JAVA_HOME", "/storage/emulated/0/JAVA/", 1);
>>
>> added the binaries and the *.jar files
>>
>> Libbluray still won't see it.
>>
>> DEBUG <general>: CBlurayCallback::Logger - bdj.c:746: BD-J check: Failed
>> to load JVM library
>>
>> I have little to no experience with Android and how paths are set but if
>> it's just a matter of figuring out how to set it, it would be really nice
>> to have.
>>
>> Hope someone shares the sentiment and feels like having a look at it.
>>
>> Regards
>> Vitor
>>
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