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lpc: remove unused ff_lpc_calc_levinson() function

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Not needed anymore, it was only used by the AAC TNS
encoder and was replaced with a more suitable function
in the following commit.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
This commit is contained in:
Rostislav Pehlivanov 2015-09-01 06:32:35 +01:00
parent 139c2f93fd
commit a70ee2bdcd
2 changed files with 0 additions and 59 deletions
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56
libavcodec/lpc.c
View File

@ -271,62 +271,6 @@ int ff_lpc_calc_coefs(LPCContext *s,
return opt_order;
}
/**
* Simplified Levinson LPC accepting float samples
*
* @param lpc_type LPC method for determining coefficients,
* see #FFLPCType for details
*/
int ff_lpc_calc_levinson(LPCContext *s, const float *samples, int len,
double lpc[][MAX_LPC_ORDER], int min_order,
int max_order, int omethod)
{
double ref[MAX_LPC_ORDER] = { 0 };
double autoc[MAX_LPC_ORDER+1];
double *w_data = s->windowed_samples;
int i, n2 = (len >> 1);
double w, c = 2.0 / (len - 1.0);
av_assert2(max_order >= MIN_LPC_ORDER && max_order <= MAX_LPC_ORDER);
/* reinit LPC context if parameters have changed */
if (len > s->blocksize || max_order > s->max_order) {
ff_lpc_end(s);
ff_lpc_init(s, len, max_order, FF_LPC_TYPE_LEVINSON);
}
/* Apply welch window */
if (len & 1) {
for(i=0; i<n2; i++) {
w = c - i - 1.0;
w = 1.0 - (w * w);
w_data[i] = samples[i] * w;
w_data[len-1-i] = samples[len-1-i] * w;
}
} else {
w_data+=n2;
samples+=n2;
for(i=0; i<n2; i++) {
w = c - n2 + i;
w = 1.0 - (w * w);
w_data[-i-1] = samples[-i-1] * w;
w_data[+i ] = samples[+i ] * w;
}
}
s->lpc_compute_autocorr(w_data, len, max_order, autoc);
compute_lpc_coefs(autoc, max_order, &lpc[0][0], max_order, 0, 1);
if(omethod == ORDER_METHOD_EST) {
for(i=0; i<max_order; i++)
ref[i] = fabs(lpc[i][i]);
return estimate_best_order(ref, min_order, max_order);
}
return max_order;
}
av_cold int ff_lpc_init(LPCContext *s, int blocksize, int max_order,
enum FFLPCType lpc_type)
{

3
libavcodec/lpc.h
View File

@ -100,9 +100,6 @@ int ff_lpc_calc_coefs(LPCContext *s,
int ff_lpc_calc_ref_coefs(LPCContext *s,
const int32_t *samples, int order, double *ref);
int ff_lpc_calc_levinson(LPCContext *s, const float *samples, int len,
double lpc[][MAX_LPC_ORDER], int min_order,
int max_order, int omethod);
/**
* Initialize LPCContext.