ref: 8fe210f14b040880829682a9f3f90b02993b4a64
dir: /silk/fixed/find_LTP_FIX.c/
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "main_FIX.h"
#include "tuning_parameters.h"
void silk_find_LTP_FIX(
opus_int32 XXLTP_Q17[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Correlation matrix */
opus_int32 xXLTP_Q17[ MAX_NB_SUBFR * LTP_ORDER ], /* O Correlation vector */
const opus_int16 r_ptr[], /* I Residual signal after LPC */
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 */
int arch /* I Run-time architecture */
)
{
opus_int i, k, extra_shifts;
opus_int xx_shifts, xX_shifts, XX_shifts;
const opus_int16 *lag_ptr;
opus_int32 *XXLTP_Q17_ptr, *xXLTP_Q17_ptr;
opus_int32 xx, nrg, temp;
xXLTP_Q17_ptr = xXLTP_Q17;
XXLTP_Q17_ptr = XXLTP_Q17;
for( k = 0; k < nb_subfr; k++ ) {
lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 );
silk_sum_sqr_shift( &xx, &xx_shifts, r_ptr, subfr_length + LTP_ORDER ); /* xx in Q( -xx_shifts ) */
silk_corrMatrix_FIX( lag_ptr, subfr_length, LTP_ORDER, XXLTP_Q17_ptr, &nrg, &XX_shifts, arch ); /* XXLTP_Q17_ptr and nrg in Q( -XX_shifts ) */
extra_shifts = xx_shifts - XX_shifts;
if( extra_shifts > 0 ) {
/* Shift XX */
xX_shifts = xx_shifts;
for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
XXLTP_Q17_ptr[ i ] = silk_RSHIFT32( XXLTP_Q17_ptr[ i ], extra_shifts ); /* Q( -xX_shifts ) */
}
nrg = silk_RSHIFT32( nrg, extra_shifts ); /* Q( -xX_shifts ) */
} else if( extra_shifts < 0 ) {
/* Shift xx */
xX_shifts = XX_shifts;
xx = silk_RSHIFT32( xx, -extra_shifts ); /* Q( -xX_shifts ) */
} else {
xX_shifts = xx_shifts;
}
silk_corrVector_FIX( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xXLTP_Q17_ptr, xX_shifts, arch ); /* xXLTP_Q17_ptr in Q( -xX_shifts ) */
/* At this point all correlations are in Q(-xX_shifts) */
temp = silk_SMLAWB( 1, nrg, SILK_FIX_CONST( LTP_CORR_INV_MAX, 16 ) );
temp = silk_max( temp, xx );
TIC(div)
#if 0
for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
XXLTP_Q17_ptr[ i ] = silk_DIV32_varQ( XXLTP_Q17_ptr[ i ], temp, 17 );
}
for( i = 0; i < LTP_ORDER; i++ ) {
xXLTP_Q17_ptr[ i ] = silk_DIV32_varQ( xXLTP_Q17_ptr[ i ], temp, 17 );
}
#else
for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) {
XXLTP_Q17_ptr[ i ] = (opus_int32)( silk_LSHIFT64( (opus_int64)XXLTP_Q17_ptr[ i ], 17 ) / temp );
}
for( i = 0; i < LTP_ORDER; i++ ) {
xXLTP_Q17_ptr[ i ] = (opus_int32)( silk_LSHIFT64( (opus_int64)xXLTP_Q17_ptr[ i ], 17 ) / temp );
}
#endif
TOC(div)
r_ptr += subfr_length;
XXLTP_Q17_ptr += LTP_ORDER * LTP_ORDER;
xXLTP_Q17_ptr += LTP_ORDER;
}
}