Class audio_output_data

src/preview-output.cpp:135–135

		aoi.samples_per_sec = mainAOI->samples_per_sec;
		aoi.speakers = mainAOI->speakers;
		aoi.input_callback = [](void *, uint64_t, uint64_t, uint64_t *, uint32_t, struct audio_output_data *) {
			return false;
		};
		aoi.input_param = nullptr;