pub unsafe extern "C" fn audio_open_file(
sps: c_int,
channels: c_int,
fmt: cst_audiofmt,
filename: *const c_char,
) -> *mut cst_audiodevpub unsafe extern "C" fn audio_open_file(
sps: c_int,
channels: c_int,
fmt: cst_audiofmt,
filename: *const c_char,
) -> *mut cst_audiodev