-typedef int (*snd_sf_sample_new_t)(void *private_data, snd_sf_sample_t *sp,
- snd_util_memhdr_t *hdr, const void __user *buf, long count);
-typedef int (*snd_sf_sample_free_t)(void *private_data, snd_sf_sample_t *sp,
- snd_util_memhdr_t *hdr);
-typedef void (*snd_sf_sample_reset_t)(void *private);
-
-typedef struct snd_sf_callback {