Programming audio with the OpenSL ES audio library in Android NDK

OpenSL ES is an application level audio library in C. Android NDK native audio APIs are based on the OpenSL ES 1.0.1 standard with Android specific extensions. The API is available for Android 2.3 or higher and some features are only supported on Android 4.0 or higher. The API functions in this libraries are not frozen yet and are still evolving. Future versions of this library may require us to update our code. This recipe introduces OpenSL ES APIs in the context of Android.

Getting ready...

Before we start coding with OpenSL ES, it is essential to understand some basics of the library. OpenSL ES stands for Open Sound Library for embedded systems, which is a cross-platform, royalty-free, C language application level API for developers to access audio functionalities of embedded systems. The library specification defines features like audio playback and recording, audio effects and controls, 2D and 3D audio, advanced MIDI...