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27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "main_FLP.h"
33 #include "tuning_parameters.h"
34
silk_find_LTP_FLP(silk_float XX[MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER],silk_float xX[MAX_NB_SUBFR * LTP_ORDER],const silk_float r_ptr[],const opus_int lag[MAX_NB_SUBFR],const opus_int subfr_length,const opus_int nb_subfr)35 void silk_find_LTP_FLP(
36 silk_float XX[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Weight for LTP quantization */
37 silk_float xX[ MAX_NB_SUBFR * LTP_ORDER ], /* O Weight for LTP quantization */
38 const silk_float r_ptr[], /* I LPC residual */
39 const opus_int lag[ MAX_NB_SUBFR ], /* I LTP lags */
40 const opus_int subfr_length, /* I Subframe length */
41 const opus_int nb_subfr /* I number of subframes */
42 )
43 {
44 opus_int k;
45 silk_float *xX_ptr, *XX_ptr;
46 const silk_float *lag_ptr;
47 silk_float xx, temp;
48
49 xX_ptr = xX;
50 XX_ptr = XX;
51 for( k = 0; k < nb_subfr; k++ ) {
52 lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
53 silk_corrMatrix_FLP( lag_ptr, subfr_length, LTP_ORDER, XX_ptr );
54 silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xX_ptr );
55 xx = ( silk_float )silk_energy_FLP( r_ptr, subfr_length + LTP_ORDER );
56 temp = 1.0f / silk_max( xx, LTP_CORR_INV_MAX * 0.5f * ( XX_ptr[ 0 ] + XX_ptr[ 24 ] ) + 1.0f );
57 silk_scale_vector_FLP( XX_ptr, temp, LTP_ORDER * LTP_ORDER );
58 silk_scale_vector_FLP( xX_ptr, temp, LTP_ORDER );
59
60 r_ptr += subfr_length;
61 XX_ptr += LTP_ORDER * LTP_ORDER;
62 xX_ptr += LTP_ORDER;
63 }
64 }
65