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#ifndef NOISE_SHAPE_H_INCLUDED
#define NOISE_SHAPE_H_INCLUDED
#ifdef __cpluspluc
extern "C" {
#endif
typedef struct noise_shape_ctx_s {
int sos_count; /* number of second order sections */
const float *bbaa; /* filter coefficients, owned by user */
float *t1, *t2; /* filter state, owned by ns library */
} noise_shape_ctx;
/**
* initializes a noise_shaper context
* returns an error code or 0
*/
extern int noise_shape_init(
noise_shape_ctx *ctx,
int sos_count,
const float *coeffs);
/**
* destroys a noise_shaper context
*/
extern void noise_shape_destroy(
noise_shape_ctx *ctx);
/**
* initializes a noise_shaper context so that its state
* is a copy of a given context
* returns an error code or 0
*/
extern int noise_shape_clone(
const noise_shape_ctx *from, noise_shape_ctx *to);
/**
* computes the next "noise shaping sample". Note: This call
* alters the internal state. xxx_get and xxx_update must be
* called in an alternating manner.
*/
extern float noise_shape_get(
noise_shape_ctx *ctx);
/**
* updates the noise shaper's state with the
* last quantization error
*/
extern void noise_shape_update(
noise_shape_ctx *ctx, float qerror);
#ifdef __cpluspluc
} /* extern "C" */
#endif
#endif /* NOISE_SHAPE_H_INCLUDED */
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