text: #ifndef SK_PEAKEQ_H
  typedef struct sk_peakeq sk_peakeq;
  #endif
  
  typedef struct {
      SPFLOAT freq, bw, gain;
      sk_peakeq *peakeq;
  } sp_peakeq;
  
  int sp_peakeq_create(sp_peakeq **p);
  int sp_peakeq_destroy(sp_peakeq **p);
  int sp_peakeq_init(sp_data *sp, sp_peakeq *p);
  int sp_peakeq_compute(sp_data *sp, sp_peakeq *p,
                        SPFLOAT *in, SPFLOAT *out);
  