Commit 8b25a20e authored by Martin Storsjö's avatar Martin Storsjö
Browse files

lpc: Add a function for calculating reflection coefficients from samples


Signed-off-by: default avatarMartin Storsjö <martin@martin.st>
parent 39ef66f5
......@@ -148,6 +148,18 @@ static int estimate_best_order(double *ref, int min_order, int max_order)
return est;
}
int ff_lpc_calc_ref_coefs(LPCContext *s,
const int32_t *samples, int order, double *ref)
{
double autoc[MAX_LPC_ORDER + 1];
s->lpc_apply_welch_window(samples, s->blocksize, s->windowed_samples);
s->lpc_compute_autocorr(s->windowed_samples, s->blocksize, order, autoc);
compute_ref_coefs(autoc, order, ref, NULL);
return order;
}
/**
* Calculate LPC coefficients for multiple orders
*
......
......@@ -92,6 +92,9 @@ int ff_lpc_calc_coefs(LPCContext *s,
enum FFLPCType lpc_type, int lpc_passes,
int omethod, int max_shift, int zero_shift);
int ff_lpc_calc_ref_coefs(LPCContext *s,
const int32_t *samples, int order, double *ref);
/**
* Initialize LPCContext.
*/
......
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