snd_compr_avail64
#define SNDRV_COMPRESS_AVAIL64 _IOR('C', 0x23, struct snd_compr_avail64)
struct snd_compr_avail64 *avail)
struct snd_compr_avail64 avail;
const struct snd_compr_avail64 *avail64)
struct snd_compr_avail64 ioctl_avail64;