OpenSL ES是支持多线且线程安全的(SL_ENGINEOPTION_THREADSAFE)，但是每个应用程序支持最大只支持创建32个音效对象(Objects)，因此最好在业务层对同一时刻播放音效的次数做出限制，否则在CreateAudioPlayer时会得到Too many objects的错误，并返回错误(SL_RESULT_MEMORY_FAILURE)
OpenSL ES for Android is designed for multi-threaded applications, and is thread-safe.
OpenSL ES for Android supports a single engine per application, and up to 32 objects. Available device memory and CPU may further restrict the usable number of objects. slCreateEngine recognizes, but ignores, these engine options: SL_ENGINEOPTION_THREADSAFE
OpenMAX AL and OpenSL ES may be used together in the same application. In this case, there is internally a single shared engine object, and the 32 object limit is shared between OpenMAX AL and OpenSL ES. The application should first create both engines, then use both engines, and finally destroy both engines. The implementation maintains a reference count on the shared engine, so that it is correctly destroyed at the second destroy.