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#ifndef _FILTER_H
#define _FILTER_H
typedef struct filter {
int iter;
double a0, a1, a2, b1, b2;
double z1[64], z2[64];
} filter_t;
void filter_lowpass_init(filter_t *bq, double frequency, int samplerate, int iterations);
void filter_highpass_init(filter_t *bq, double frequency, int samplerate, int iterations);
void filter_process(filter_t *bq, sample_t *samples, int length);
#endif /* _FILTER_H */
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