ref: 49ff67154a0150cade077dcd040d68bc6a200b17
dir: /h/jcrev.h/
typedef struct { void *ud; } sp_jcrev; int sp_jcrev_create(sp_jcrev **p); int sp_jcrev_destroy(sp_jcrev **p); int sp_jcrev_init(sp_data *sp, sp_jcrev *p); int sp_jcrev_compute(sp_data *sp, sp_jcrev *p, SPFLOAT *in, SPFLOAT *out);