mod_theora does not play sound in Android

[Joseba Echevarria García]

mod_theora plays audio through OpenAL. This seems to be working great in windows/linux/OS X and in iOS but Android does not natively support it.

Compiling OpenAL in Android is cumbersome so a native OpenSL ES implementation would probably work better. The OpenSL ES API is -for our limited needs- somewhat similar to the OpenAL API, so it should not be too hard to implement.

A very simple OpenSL ES example can be found here.

[Joseba Echevarria García]

Completely fixed in 31fc0a0.

The problem was that mod_theora was indirectly using libtremor in Android for OGG/Vorbis decoding. Tremor returns int32 audio, instead of float32, which is what I was expecting. Switching SDL_mixer to build libvorbis/libvorbisfile instead of libtremor (in ac57379) fixes the issue.