Extract sound from .so:

# Compile extract.cpp
clang++ -o extract ./extract.cpp

# Usage
./extract [Path To libminecraftpe.so] > minecraftpe.c

Compile .c to sound.so:

# Get toolchain
sudo apt-get install libc6-armel-cross libc6-dev-armel-cross binutils-arm-linux-gnueabi libncurses5-dev build-essential

# Compile
arm-linux-gnueabihf-gcc -shared -o libminecraftpe.so minecraftpe.c