HelenOS sources

hda_set_converter_fmt  663 uspace/drv/audio/hdaudio/codec.c 	rc = hda_set_converter_fmt(codec, codec->out_aw, stream->fmt);
hda_set_converter_fmt  684 uspace/drv/audio/hdaudio/codec.c 	rc = hda_set_converter_fmt(codec, codec->in_aw, stream->fmt);
HelenOS homepage, sources at GitHub