116 lines
5.9 KiB
C
Executable file
116 lines
5.9 KiB
C
Executable file
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "main_FLP.h"
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/* Find LPC and LTP coefficients */
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void silk_find_pred_coefs_FLP(
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silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
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silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
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const silk_float res_pitch[], /* I Residual from pitch analysis */
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const silk_float x[], /* I Speech signal */
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opus_int condCoding /* I The type of conditional coding to use */
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)
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{
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opus_int i;
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silk_float WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ];
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silk_float invGains[ MAX_NB_SUBFR ], Wght[ MAX_NB_SUBFR ];
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opus_int16 NLSF_Q15[ MAX_LPC_ORDER ];
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const silk_float *x_ptr;
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silk_float *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ];
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silk_float minInvGain;
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/* Weighting for weighted least squares */
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for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
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silk_assert( psEncCtrl->Gains[ i ] > 0.0f );
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invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ];
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Wght[ i ] = invGains[ i ] * invGains[ i ];
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}
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if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
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/**********/
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/* VOICED */
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/**********/
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silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );
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/* LTP analysis */
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silk_find_LTP_FLP( psEncCtrl->LTPCoef, WLTP, &psEncCtrl->LTPredCodGain, res_pitch,
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psEncCtrl->pitchL, Wght, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length );
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/* Quantize LTP gain parameters */
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silk_quant_LTP_gains_FLP( psEncCtrl->LTPCoef, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex,
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WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr );
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/* Control LTP scaling */
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silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding );
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/* Create LTP residual */
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silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef,
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psEncCtrl->pitchL, invGains, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
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} else {
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/************/
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/* UNVOICED */
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/************/
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/* Create signal with prepended subframes, scaled by inverse gains */
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x_ptr = x - psEnc->sCmn.predictLPCOrder;
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x_pre_ptr = LPC_in_pre;
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for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
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silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ],
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psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
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x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
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x_ptr += psEnc->sCmn.subfr_length;
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}
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silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) );
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psEncCtrl->LTPredCodGain = 0.0f;
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}
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/* Limit on total predictive coding gain */
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if( psEnc->sCmn.first_frame_after_reset ) {
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minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET;
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} else {
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minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) / MAX_PREDICTION_POWER_GAIN;
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minInvGain /= 0.25f + 0.75f * psEncCtrl->coding_quality;
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}
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/* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */
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silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain );
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/* Quantize LSFs */
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silk_process_NLSFs_FLP( &psEnc->sCmn, psEncCtrl->PredCoef, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 );
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/* Calculate residual energy using quantized LPC coefficients */
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silk_residual_energy_FLP( psEncCtrl->ResNrg, LPC_in_pre, psEncCtrl->PredCoef, psEncCtrl->Gains,
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psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
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/* Copy to prediction struct for use in next frame for interpolation */
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silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
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}
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