buffmem_desc      619 include/uapi/linux/soundcard.h #define SNDCTL_DSP_MAPINBUF		_SIOR ('P', 19, buffmem_desc)
buffmem_desc      620 include/uapi/linux/soundcard.h #define SNDCTL_DSP_MAPOUTBUF		_SIOR ('P', 20, buffmem_desc)