Android NDK Beginner`s Guide - Second Edition

Time for action – creating and playing a sound buffer queue

Let's use OpenSL ES to play an explosion sound stored in a memory buffer:

1. Update jni/Resource.hpp again to add a new method getLength(), which provides the size in bytes of an asset file:

   ...
   class Resource {
   public:
       ...
   
       ResourceDescriptor descriptor();
       off_t getLength();
       ...
   };
   
   #endif

2. Implement this method in jni/Resource.cpp:

   ...
   off_t Resource::getLength() {
       return AAsset_getLength(mAsset);
   }
   ...

3. Create jni/Sound.hpp to manage a sound buffer.

   Define a method load() to load a PCM file and unload() to release it.

   Also, define the appropriate getters. Hold the raw sound data in a buffer along with its size. The sound is loaded from a Resource:

   #ifndef _PACKT_SOUND_HPP_ #define _PACKT_SOUND_HPP_ ...