audio_prinfo_t
devaudio_compose_format(audio_prinfo_t *prinfo)
devaudio_decompose_format(audio_prinfo_t *prinfo, int afmt)
audio_prinfo_t *prinfo;
audio_prinfo_t *play = &proc->p_info.play;
audio_prinfo_t *rec = &proc->p_info.record;
audio_prinfo_t *npr;
audio_prinfo_t *opr;
audio_prinfo_t record; /* input status information */
audio_prinfo_t play; /* output status information */