pub unsafe extern "C" fn SherpaOnnxOfflineTtsGenerateWithCallbackWithArg(
tts: *const SherpaOnnxOfflineTts,
text: *const c_char,
sid: i32,
speed: f32,
callback: SherpaOnnxGeneratedAudioCallbackWithArg,
arg: *mut c_void,
) -> *const SherpaOnnxGeneratedAudio