129 lines
5.7 KiB
C
129 lines
5.7 KiB
C
/***********************************************************************
|
|
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
- Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
- Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
- Neither the name of Internet Society, IETF or IETF Trust, nor the
|
|
names of specific contributors, may be used to endorse or promote
|
|
products derived from this software without specific prior written
|
|
permission.
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
***********************************************************************/
|
|
#include "opus/opus_config.h"
|
|
|
|
#include "opus/silk/float/main_FLP.h"
|
|
#include "opus/silk/tuning_parameters.h"
|
|
|
|
void silk_find_LTP_FLP(
|
|
silk_float b[ MAX_NB_SUBFR * LTP_ORDER ], /* O LTP coefs */
|
|
silk_float WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Weight for LTP quantization */
|
|
silk_float *LTPredCodGain, /* O LTP coding gain */
|
|
const silk_float r_lpc[], /* I LPC residual */
|
|
const opus_int lag[ MAX_NB_SUBFR ], /* I LTP lags */
|
|
const silk_float Wght[ MAX_NB_SUBFR ], /* I Weights */
|
|
const opus_int subfr_length, /* I Subframe length */
|
|
const opus_int nb_subfr, /* I number of subframes */
|
|
const opus_int mem_offset /* I Number of samples in LTP memory */
|
|
)
|
|
{
|
|
opus_int i, k;
|
|
silk_float *b_ptr, temp, *WLTP_ptr;
|
|
silk_float LPC_res_nrg, LPC_LTP_res_nrg;
|
|
silk_float d[ MAX_NB_SUBFR ], m, g, delta_b[ LTP_ORDER ];
|
|
silk_float w[ MAX_NB_SUBFR ], nrg[ MAX_NB_SUBFR ], regu;
|
|
silk_float Rr[ LTP_ORDER ], rr[ MAX_NB_SUBFR ];
|
|
const silk_float *r_ptr, *lag_ptr;
|
|
|
|
b_ptr = b;
|
|
WLTP_ptr = WLTP;
|
|
r_ptr = &r_lpc[ mem_offset ];
|
|
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, WLTP_ptr );
|
|
silk_corrVector_FLP( lag_ptr, r_ptr, subfr_length, LTP_ORDER, Rr );
|
|
|
|
rr[ k ] = ( silk_float )silk_energy_FLP( r_ptr, subfr_length );
|
|
regu = 1.0f + rr[ k ] +
|
|
matrix_ptr( WLTP_ptr, 0, 0, LTP_ORDER ) +
|
|
matrix_ptr( WLTP_ptr, LTP_ORDER-1, LTP_ORDER-1, LTP_ORDER );
|
|
regu *= LTP_DAMPING / 3;
|
|
silk_regularize_correlations_FLP( WLTP_ptr, &rr[ k ], regu, LTP_ORDER );
|
|
silk_solve_LDL_FLP( WLTP_ptr, LTP_ORDER, Rr, b_ptr );
|
|
|
|
/* Calculate residual energy */
|
|
nrg[ k ] = silk_residual_energy_covar_FLP( b_ptr, WLTP_ptr, Rr, rr[ k ], LTP_ORDER );
|
|
|
|
temp = Wght[ k ] / ( nrg[ k ] * Wght[ k ] + 0.01f * subfr_length );
|
|
silk_scale_vector_FLP( WLTP_ptr, temp, LTP_ORDER * LTP_ORDER );
|
|
w[ k ] = matrix_ptr( WLTP_ptr, LTP_ORDER / 2, LTP_ORDER / 2, LTP_ORDER );
|
|
|
|
r_ptr += subfr_length;
|
|
b_ptr += LTP_ORDER;
|
|
WLTP_ptr += LTP_ORDER * LTP_ORDER;
|
|
}
|
|
|
|
/* Compute LTP coding gain */
|
|
if( LTPredCodGain != NULL ) {
|
|
LPC_LTP_res_nrg = 1e-6f;
|
|
LPC_res_nrg = 0.0f;
|
|
for( k = 0; k < nb_subfr; k++ ) {
|
|
LPC_res_nrg += rr[ k ] * Wght[ k ];
|
|
LPC_LTP_res_nrg += nrg[ k ] * Wght[ k ];
|
|
}
|
|
|
|
silk_assert( LPC_LTP_res_nrg > 0 );
|
|
*LTPredCodGain = 3.0f * silk_log2( LPC_res_nrg / LPC_LTP_res_nrg );
|
|
}
|
|
|
|
/* Smoothing */
|
|
/* d = sum( B, 1 ); */
|
|
b_ptr = b;
|
|
for( k = 0; k < nb_subfr; k++ ) {
|
|
d[ k ] = 0;
|
|
for( i = 0; i < LTP_ORDER; i++ ) {
|
|
d[ k ] += b_ptr[ i ];
|
|
}
|
|
b_ptr += LTP_ORDER;
|
|
}
|
|
/* m = ( w * d' ) / ( sum( w ) + 1e-3 ); */
|
|
temp = 1e-3f;
|
|
for( k = 0; k < nb_subfr; k++ ) {
|
|
temp += w[ k ];
|
|
}
|
|
m = 0;
|
|
for( k = 0; k < nb_subfr; k++ ) {
|
|
m += d[ k ] * w[ k ];
|
|
}
|
|
m = m / temp;
|
|
|
|
b_ptr = b;
|
|
for( k = 0; k < nb_subfr; k++ ) {
|
|
g = LTP_SMOOTHING / ( LTP_SMOOTHING + w[ k ] ) * ( m - d[ k ] );
|
|
temp = 0;
|
|
for( i = 0; i < LTP_ORDER; i++ ) {
|
|
delta_b[ i ] = silk_max_float( b_ptr[ i ], 0.1f );
|
|
temp += delta_b[ i ];
|
|
}
|
|
temp = g / temp;
|
|
for( i = 0; i < LTP_ORDER; i++ ) {
|
|
b_ptr[ i ] = b_ptr[ i ] + delta_b[ i ] * temp;
|
|
}
|
|
b_ptr += LTP_ORDER;
|
|
}
|
|
}
|