ref: 2e86b938c226edc0d8bd6c3855baf3bec02b5179
dir: /h/spa.h/
typedef struct { SPFLOAT *buf; uint32_t pos; uint32_t bufsize; sp_audio spa; } sp_spa; int sp_spa_create(sp_spa **p); int sp_spa_destroy(sp_spa **p); int sp_spa_init(sp_data *sp, sp_spa *p, const char *filename); int sp_spa_compute(sp_data *sp, sp_spa *p, SPFLOAT *in, SPFLOAT *out);