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lpc: Add a function for calculating reflection coefficients from samples

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Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-10-25 15:33:15 +03:00
parent 39ef66f530
commit 8b25a20efb
2 changed files with 15 additions and 0 deletions
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12
libavcodec/lpc.c
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@ -148,6 +148,18 @@ static int estimate_best_order(double *ref, int min_order, int max_order)
return est; 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 * Calculate LPC coefficients for multiple orders
* *

3
libavcodec/lpc.h
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@ -92,6 +92,9 @@ int ff_lpc_calc_coefs(LPCContext *s,
enum FFLPCType lpc_type, int lpc_passes, enum FFLPCType lpc_type, int lpc_passes,
int omethod, int max_shift, int zero_shift); 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. * Initialize LPCContext.
*/ */