mirror of
https://github.com/Relintai/pandemonium_engine.git
synced 2024-12-21 03:16:54 +01:00
152 lines
7.2 KiB
C
152 lines
7.2 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.
|
||
|
|
***********************************************************************/
|
||
|
|
|
||
|
|
#ifdef HAVE_CONFIG_H
|
||
|
|
#include "config.h"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "main_FIX.h"
|
||
|
|
#include "stack_alloc.h"
|
||
|
|
#include "tuning_parameters.h"
|
||
|
|
|
||
|
|
/* Finds LPC vector from correlations, and converts to NLSF */
|
||
|
|
void silk_find_LPC_FIX(
|
||
|
|
silk_encoder_state *psEncC, /* I/O Encoder state */
|
||
|
|
opus_int16 NLSF_Q15[], /* O NLSFs */
|
||
|
|
const opus_int16 x[], /* I Input signal */
|
||
|
|
const opus_int32 minInvGain_Q30 /* I Inverse of max prediction gain */
|
||
|
|
)
|
||
|
|
{
|
||
|
|
opus_int k, subfr_length;
|
||
|
|
opus_int32 a_Q16[ MAX_LPC_ORDER ];
|
||
|
|
opus_int isInterpLower, shift;
|
||
|
|
opus_int32 res_nrg0, res_nrg1;
|
||
|
|
opus_int rshift0, rshift1;
|
||
|
|
|
||
|
|
/* Used only for LSF interpolation */
|
||
|
|
opus_int32 a_tmp_Q16[ MAX_LPC_ORDER ], res_nrg_interp, res_nrg, res_tmp_nrg;
|
||
|
|
opus_int res_nrg_interp_Q, res_nrg_Q, res_tmp_nrg_Q;
|
||
|
|
opus_int16 a_tmp_Q12[ MAX_LPC_ORDER ];
|
||
|
|
opus_int16 NLSF0_Q15[ MAX_LPC_ORDER ];
|
||
|
|
SAVE_STACK;
|
||
|
|
|
||
|
|
subfr_length = psEncC->subfr_length + psEncC->predictLPCOrder;
|
||
|
|
|
||
|
|
/* Default: no interpolation */
|
||
|
|
psEncC->indices.NLSFInterpCoef_Q2 = 4;
|
||
|
|
|
||
|
|
/* Burg AR analysis for the full frame */
|
||
|
|
silk_burg_modified( &res_nrg, &res_nrg_Q, a_Q16, x, minInvGain_Q30, subfr_length, psEncC->nb_subfr, psEncC->predictLPCOrder, psEncC->arch );
|
||
|
|
|
||
|
|
if( psEncC->useInterpolatedNLSFs && !psEncC->first_frame_after_reset && psEncC->nb_subfr == MAX_NB_SUBFR ) {
|
||
|
|
VARDECL( opus_int16, LPC_res );
|
||
|
|
|
||
|
|
/* Optimal solution for last 10 ms */
|
||
|
|
silk_burg_modified( &res_tmp_nrg, &res_tmp_nrg_Q, a_tmp_Q16, x + 2 * subfr_length, minInvGain_Q30, subfr_length, 2, psEncC->predictLPCOrder, psEncC->arch );
|
||
|
|
|
||
|
|
/* subtract residual energy here, as that's easier than adding it to the */
|
||
|
|
/* residual energy of the first 10 ms in each iteration of the search below */
|
||
|
|
shift = res_tmp_nrg_Q - res_nrg_Q;
|
||
|
|
if( shift >= 0 ) {
|
||
|
|
if( shift < 32 ) {
|
||
|
|
res_nrg = res_nrg - silk_RSHIFT( res_tmp_nrg, shift );
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
silk_assert( shift > -32 );
|
||
|
|
res_nrg = silk_RSHIFT( res_nrg, -shift ) - res_tmp_nrg;
|
||
|
|
res_nrg_Q = res_tmp_nrg_Q;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Convert to NLSFs */
|
||
|
|
silk_A2NLSF( NLSF_Q15, a_tmp_Q16, psEncC->predictLPCOrder );
|
||
|
|
|
||
|
|
ALLOC( LPC_res, 2 * subfr_length, opus_int16 );
|
||
|
|
|
||
|
|
/* Search over interpolation indices to find the one with lowest residual energy */
|
||
|
|
for( k = 3; k >= 0; k-- ) {
|
||
|
|
/* Interpolate NLSFs for first half */
|
||
|
|
silk_interpolate( NLSF0_Q15, psEncC->prev_NLSFq_Q15, NLSF_Q15, k, psEncC->predictLPCOrder );
|
||
|
|
|
||
|
|
/* Convert to LPC for residual energy evaluation */
|
||
|
|
silk_NLSF2A( a_tmp_Q12, NLSF0_Q15, psEncC->predictLPCOrder );
|
||
|
|
|
||
|
|
/* Calculate residual energy with NLSF interpolation */
|
||
|
|
silk_LPC_analysis_filter( LPC_res, x, a_tmp_Q12, 2 * subfr_length, psEncC->predictLPCOrder, psEncC->arch );
|
||
|
|
|
||
|
|
silk_sum_sqr_shift( &res_nrg0, &rshift0, LPC_res + psEncC->predictLPCOrder, subfr_length - psEncC->predictLPCOrder );
|
||
|
|
silk_sum_sqr_shift( &res_nrg1, &rshift1, LPC_res + psEncC->predictLPCOrder + subfr_length, subfr_length - psEncC->predictLPCOrder );
|
||
|
|
|
||
|
|
/* Add subframe energies from first half frame */
|
||
|
|
shift = rshift0 - rshift1;
|
||
|
|
if( shift >= 0 ) {
|
||
|
|
res_nrg1 = silk_RSHIFT( res_nrg1, shift );
|
||
|
|
res_nrg_interp_Q = -rshift0;
|
||
|
|
} else {
|
||
|
|
res_nrg0 = silk_RSHIFT( res_nrg0, -shift );
|
||
|
|
res_nrg_interp_Q = -rshift1;
|
||
|
|
}
|
||
|
|
res_nrg_interp = silk_ADD32( res_nrg0, res_nrg1 );
|
||
|
|
|
||
|
|
/* Compare with first half energy without NLSF interpolation, or best interpolated value so far */
|
||
|
|
shift = res_nrg_interp_Q - res_nrg_Q;
|
||
|
|
if( shift >= 0 ) {
|
||
|
|
if( silk_RSHIFT( res_nrg_interp, shift ) < res_nrg ) {
|
||
|
|
isInterpLower = silk_TRUE;
|
||
|
|
} else {
|
||
|
|
isInterpLower = silk_FALSE;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if( -shift < 32 ) {
|
||
|
|
if( res_nrg_interp < silk_RSHIFT( res_nrg, -shift ) ) {
|
||
|
|
isInterpLower = silk_TRUE;
|
||
|
|
} else {
|
||
|
|
isInterpLower = silk_FALSE;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
isInterpLower = silk_FALSE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Determine whether current interpolated NLSFs are best so far */
|
||
|
|
if( isInterpLower == silk_TRUE ) {
|
||
|
|
/* Interpolation has lower residual energy */
|
||
|
|
res_nrg = res_nrg_interp;
|
||
|
|
res_nrg_Q = res_nrg_interp_Q;
|
||
|
|
psEncC->indices.NLSFInterpCoef_Q2 = (opus_int8)k;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if( psEncC->indices.NLSFInterpCoef_Q2 == 4 ) {
|
||
|
|
/* NLSF interpolation is currently inactive, calculate NLSFs from full frame AR coefficients */
|
||
|
|
silk_A2NLSF( NLSF_Q15, a_Q16, psEncC->predictLPCOrder );
|
||
|
|
}
|
||
|
|
|
||
|
|
silk_assert( psEncC->indices.NLSFInterpCoef_Q2 == 4 || ( psEncC->useInterpolatedNLSFs && !psEncC->first_frame_after_reset && psEncC->nb_subfr == MAX_NB_SUBFR ) );
|
||
|
|
RESTORE_STACK;
|
||
|
|
}
|