diff options
Diffstat (limited to 'src/opus-1.0.2/silk/float/find_LPC_FLP.c')
| -rw-r--r-- | src/opus-1.0.2/silk/float/find_LPC_FLP.c | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/src/opus-1.0.2/silk/float/find_LPC_FLP.c b/src/opus-1.0.2/silk/float/find_LPC_FLP.c deleted file mode 100644 index 66fa7dd4..00000000 --- a/src/opus-1.0.2/silk/float/find_LPC_FLP.c +++ /dev/null @@ -1,104 +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 "define.h" -#include "main_FLP.h" -#include "tuning_parameters.h" - -/* LPC analysis */ -void silk_find_LPC_FLP( - silk_encoder_state *psEncC, /* I/O Encoder state */ - opus_int16 NLSF_Q15[], /* O NLSFs */ - const silk_float x[], /* I Input signal */ - const silk_float minInvGain /* I Inverse of max prediction gain */ -) -{ - opus_int k, subfr_length; - silk_float a[ MAX_LPC_ORDER ]; - - /* Used only for NLSF interpolation */ - silk_float res_nrg, res_nrg_2nd, res_nrg_interp; - opus_int16 NLSF0_Q15[ MAX_LPC_ORDER ]; - silk_float a_tmp[ MAX_LPC_ORDER ]; - silk_float LPC_res[ MAX_FRAME_LENGTH + MAX_NB_SUBFR * MAX_LPC_ORDER ]; - - subfr_length = psEncC->subfr_length + psEncC->predictLPCOrder; - - /* Default: No interpolation */ - psEncC->indices.NLSFInterpCoef_Q2 = 4; - - /* Burg AR analysis for the full frame */ - res_nrg = silk_burg_modified_FLP( a, x, minInvGain, subfr_length, psEncC->nb_subfr, psEncC->predictLPCOrder ); - - if( psEncC->useInterpolatedNLSFs && !psEncC->first_frame_after_reset && psEncC->nb_subfr == MAX_NB_SUBFR ) { - /* Optimal solution for last 10 ms; 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 */ - res_nrg -= silk_burg_modified_FLP( a_tmp, x + ( MAX_NB_SUBFR / 2 ) * subfr_length, minInvGain, subfr_length, MAX_NB_SUBFR / 2, psEncC->predictLPCOrder ); - - /* Convert to NLSFs */ - silk_A2NLSF_FLP( NLSF_Q15, a_tmp, psEncC->predictLPCOrder ); - - /* Search over interpolation indices to find the one with lowest residual energy */ - res_nrg_2nd = silk_float_MAX; - 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_FLP( a_tmp, NLSF0_Q15, psEncC->predictLPCOrder ); - - /* Calculate residual energy with LSF interpolation */ - silk_LPC_analysis_filter_FLP( LPC_res, a_tmp, x, 2 * subfr_length, psEncC->predictLPCOrder ); - res_nrg_interp = (silk_float)( - silk_energy_FLP( LPC_res + psEncC->predictLPCOrder, subfr_length - psEncC->predictLPCOrder ) + - silk_energy_FLP( LPC_res + psEncC->predictLPCOrder + subfr_length, subfr_length - psEncC->predictLPCOrder ) ); - - /* Determine whether current interpolated NLSFs are best so far */ - if( res_nrg_interp < res_nrg ) { - /* Interpolation has lower residual energy */ - res_nrg = res_nrg_interp; - psEncC->indices.NLSFInterpCoef_Q2 = (opus_int8)k; - } else if( res_nrg_interp > res_nrg_2nd ) { - /* No reason to continue iterating - residual energies will continue to climb */ - break; - } - res_nrg_2nd = res_nrg_interp; - } - } - - if( psEncC->indices.NLSFInterpCoef_Q2 == 4 ) { - /* NLSF interpolation is currently inactive, calculate NLSFs from full frame AR coefficients */ - silk_A2NLSF_FLP( NLSF_Q15, a, psEncC->predictLPCOrder ); - } - - silk_assert( psEncC->indices.NLSFInterpCoef_Q2 == 4 || - ( psEncC->useInterpolatedNLSFs && !psEncC->first_frame_after_reset && psEncC->nb_subfr == MAX_NB_SUBFR ) ); -} |