/*** Copyright (c) 1999-2016, Erik de Castro Lopo <erikd@mega-nerd.com>** All rights reserved.**** This code is released under 2-clause BSD license. Please see the** file at : https://github.com/libsndfile/libsamplerate/blob/master/COPYING*/ typedef	struct AUDIO_OUT AUDIO_OUT ; typedef int (*get_audio_callback_t) (void *callback_data, float *samples, int frames) ; /* A general audio output function (Linux/ALSA, Linux/OSS, Win32, MacOSX,** Solaris) which retrieves data using the callback function in the above** struct.**** audio_open - opens the device and returns an anonymous pointer to its**              own private data.*/ AUDIO_OUT *audio_open (int channels, int samplerate) ; void audio_play (get_audio_callback_t callback, AUDIO_OUT *audio_out, void *callback_data) ; void audio_close (AUDIO_OUT *audio_data) ;