count_info
sndctl_dsp_getoptr(audio_client_t *c, count_info *ci)
sndctl_dsp_getiptr(audio_client_t *c, count_info *ci)
rv = sndctl_dsp_getoptr(c, (count_info *)data);
rv = sndctl_dsp_getiptr(c, (count_info *)data);
#define SNDCTL_DSP_GETIPTR __OSSIOR('P', 17, count_info)
#define SNDCTL_DSP_GETOPTR __OSSIOR('P', 18, count_info)