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

[Shaya Potter]

I'm not really a libbluray developer, but I'm wondering if kodi's
distinction between menu and non menu really applies to blurays in
general.  One can have menu type stuff on screen when a blurays is playing
a movie, even resizing the video.  Heck, I've even seen dynamic animations
done via java code overlayed on top of playing video (ex: the trivia track
from the breakfast club 30th anniversary blurays, the dvd includes it as a
normal vobsub, the bluray tries to be fancier).

I.e. if the movie is being played from a java/xlet context, is there a
difference if it's a menu or not?  I really don't know, hence asking the q.


On Thu, Jan 21, 2021, 12:46 AM Vitor Dall'Acqua <veggav at gmail.com> wrote:

> 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
>>>
>>> _______________________________________________
>>> libbluray-devel mailing list
>>> libbluray-devel at videolan.org
>>> https://mailman.videolan.org/listinfo/libbluray-devel
>>>
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