get traction_engine working

[atsushieno]

tracktion_engine builds on Android, and it is most likely that it can handle audio plugin related bits in JUCE.

Then, if we implement juce_audio_processor for AAP it is likely to work. augene project can be used as a reference player. It is very simple auduo plugin based music player based on tracktion_engine.

Problem: even if we get this working, there is no "instrumental" sample yet.

[atsushieno]

Current problem: JUCE Android backend holds its own JavaVM and attach to JNIEnv by its own current thread. Call to JavaVM->AttachCurrentThread() twice does not work ("Calling AttachCurrentThread() on an already-attached thread is a no-op."). There needs to be some workarounds that makes it possible to unify those two frameworks.

[atsushieno]

So far everything avoids dynamic JNIEnv instancing from JavaVM.

bd74234 has some JUCEy treat:

[atsushieno]

https://www.youtube.com/watch?v=cA8qJuAbUVc

[atsushieno]

JUCE integration has moved to aap-juce repo. Closing.