Time for action – creating OpenSL ES engine and output

Let's create a new manager dedicated to sounds:

1. Create a new file jni/SoundManager.hpp.

   First, include the OpenSL ES standard header SLES/OpenSLES.h. The two latter define objects and methods and are specifically created for Android. Then, create the SoundManager class to do the following:

   • Initialize OpenSL ES with the start() method
   • Stop the sound and release OpenSL ES with the stop() method

   There are two main kinds of pseudo-object structures (that is, containing function pointers applied on the structure itself, such as a C++ object with this) in OpenSL ES:

   • Objects: These are represented by SLObjectItf, which provides a few common methods to get allocated resources and object interfaces. This could be roughly compared to an object in Java.
   • Interfaces: These give access to object features. There can be several interfaces for an object. Depending on the host device, some interfaces may or may not be available. These are very roughly...