Function module_audio_set 

pub unsafe extern "C" fn module_audio_set(
    var: *const c_char,
    val: *const c_char,
) -> c_int

Set audio parameter

Your module implementation must export it’s own version of this function, unless your build system builds and links with its own version of module-utils.c from the speech-dispatcher distribution.

Note that this function is only required when using client audio playback. Implementations relying on server playback being available may stub this.

#[unsafe(no_mangle)]
unsafe extern "C" fn module_audio_set(var: *const raw::c_char, val: *const raw::c_char) -> raw::c_int {
    -1  // Stub implementation
}