HelenOS sources

sdir_output       256 uspace/drv/audio/hdaudio/pcm_iface.c 	hda->pcm_stream = hda_stream_create(hda, sdir_output, hda->pcm_buffers,
sdir_output       236 uspace/drv/audio/hdaudio/stream.c 	case sdir_output:
HelenOS homepage, sources at GitHub