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-rw-r--r--src/opus-1.1/silk/fixed/find_LPC_FIX.c151
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diff --git a/src/opus-1.1/silk/fixed/find_LPC_FIX.c b/src/opus-1.1/silk/fixed/find_LPC_FIX.c
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--- a/src/opus-1.1/silk/fixed/find_LPC_FIX.c
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@@ -1,151 +0,0 @@
-/***********************************************************************
-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 );
-
- 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;
-}
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