This directory contains the sources for a audio_dfx.so binary that implements the ABIs and essential logic of a DFX shared library. This includes an implementation of the basic ‘C’ interface (dfx_lib.cc), a base class for device effects (dfx_base.cc/dfx_base.h), and three effects derived from that class (delay, swap, and rechannel -- dfx_delay.cc/dfx_delay.h, dfx_swap.h and dfx_rechannel.h respectively).
Coupled with the audio_device_fx.h file from parent directory, this example shared library is built along with a audio_dfx_tests test binary that verifies its correct operation. Note that the two binaries (library and test) are built in the same package, so that the tests can directly load and call the library.