pub unsafe extern "C" fn obs_transition_audio_render(
transition: *mut obs_source_t,
ts_out: *mut u64,
audio: *mut obs_source_audio_mix,
mixers: u32,
channels: usize,
sample_rate: usize,
mix_a_callback: obs_transition_audio_mix_callback_t,
mix_b_callback: obs_transition_audio_mix_callback_t,
) -> bool