pub unsafe extern "C" fn switch_core_speech_open(
sh: *mut switch_speech_handle_t,
module_name: *const c_char,
voice_name: *const c_char,
rate: c_uint,
interval: c_uint,
channels: c_uint,
flags: *mut switch_speech_flag_t,
pool: *mut switch_memory_pool_t,
) -> switch_status_t