ref: 4bd112d827d7c75add17d512929ea6b0a258d86a
dir: /silk/float/find_LTP_FLP.c/
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "main_FLP.h"
#include "tuning_parameters.h"
void silk_find_LTP_FLP(
silk_float XX[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Weight for LTP quantization */
silk_float xX[ MAX_NB_SUBFR * LTP_ORDER ], /* O Weight for LTP quantization */
const silk_float r_ptr[], /* I LPC residual */
const opus_int lag[ MAX_NB_SUBFR ], /* I LTP lags */
const opus_int subfr_length, /* I Subframe length */
const opus_int nb_subfr /* I number of subframes */
)
{
opus_int k;
silk_float *xX_ptr, *XX_ptr;
const silk_float *lag_ptr;
silk_float xx, temp;
xX_ptr = xX;
XX_ptr = XX;
for( k = 0; k < nb_subfr; k++ ) {
lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
silk_corrMatrix_FLP( lag_ptr, subfr_length, LTP_ORDER, XX_ptr );
silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xX_ptr );
xx = ( silk_float )silk_energy_FLP( r_ptr, subfr_length + LTP_ORDER );
temp = 1.0f / silk_max( xx, LTP_CORR_INV_MAX * 0.5f * ( XX_ptr[ 0 ] + XX_ptr[ 24 ] ) + 1.0f );
silk_scale_vector_FLP( XX_ptr, temp, LTP_ORDER * LTP_ORDER );
silk_scale_vector_FLP( xX_ptr, temp, LTP_ORDER );
r_ptr += subfr_length;
XX_ptr += LTP_ORDER * LTP_ORDER;
xX_ptr += LTP_ORDER;
}
}