1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/float/find_pred_coefs_FLP.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,117 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +#include "main_FLP.h"
1.36 +
1.37 +/* Find LPC and LTP coefficients */
1.38 +void silk_find_pred_coefs_FLP(
1.39 + silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
1.40 + silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
1.41 + const silk_float res_pitch[], /* I Residual from pitch analysis */
1.42 + const silk_float x[], /* I Speech signal */
1.43 + opus_int condCoding /* I The type of conditional coding to use */
1.44 +)
1.45 +{
1.46 + opus_int i;
1.47 + silk_float WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ];
1.48 + silk_float invGains[ MAX_NB_SUBFR ], Wght[ MAX_NB_SUBFR ];
1.49 + opus_int16 NLSF_Q15[ MAX_LPC_ORDER ];
1.50 + const silk_float *x_ptr;
1.51 + silk_float *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ];
1.52 + silk_float minInvGain;
1.53 +
1.54 + /* Weighting for weighted least squares */
1.55 + for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
1.56 + silk_assert( psEncCtrl->Gains[ i ] > 0.0f );
1.57 + invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ];
1.58 + Wght[ i ] = invGains[ i ] * invGains[ i ];
1.59 + }
1.60 +
1.61 + if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
1.62 + /**********/
1.63 + /* VOICED */
1.64 + /**********/
1.65 + silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );
1.66 +
1.67 + /* LTP analysis */
1.68 + silk_find_LTP_FLP( psEncCtrl->LTPCoef, WLTP, &psEncCtrl->LTPredCodGain, res_pitch,
1.69 + psEncCtrl->pitchL, Wght, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length );
1.70 +
1.71 + /* Quantize LTP gain parameters */
1.72 + silk_quant_LTP_gains_FLP( psEncCtrl->LTPCoef, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex,
1.73 + &psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr );
1.74 +
1.75 + /* Control LTP scaling */
1.76 + silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding );
1.77 +
1.78 + /* Create LTP residual */
1.79 + silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef,
1.80 + psEncCtrl->pitchL, invGains, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
1.81 + } else {
1.82 + /************/
1.83 + /* UNVOICED */
1.84 + /************/
1.85 + /* Create signal with prepended subframes, scaled by inverse gains */
1.86 + x_ptr = x - psEnc->sCmn.predictLPCOrder;
1.87 + x_pre_ptr = LPC_in_pre;
1.88 + for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
1.89 + silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ],
1.90 + psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
1.91 + x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
1.92 + x_ptr += psEnc->sCmn.subfr_length;
1.93 + }
1.94 + silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) );
1.95 + psEncCtrl->LTPredCodGain = 0.0f;
1.96 + psEnc->sCmn.sum_log_gain_Q7 = 0;
1.97 + }
1.98 +
1.99 + /* Limit on total predictive coding gain */
1.100 + if( psEnc->sCmn.first_frame_after_reset ) {
1.101 + minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET;
1.102 + } else {
1.103 + minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) / MAX_PREDICTION_POWER_GAIN;
1.104 + minInvGain /= 0.25f + 0.75f * psEncCtrl->coding_quality;
1.105 + }
1.106 +
1.107 + /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */
1.108 + silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain );
1.109 +
1.110 + /* Quantize LSFs */
1.111 + silk_process_NLSFs_FLP( &psEnc->sCmn, psEncCtrl->PredCoef, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 );
1.112 +
1.113 + /* Calculate residual energy using quantized LPC coefficients */
1.114 + silk_residual_energy_FLP( psEncCtrl->ResNrg, LPC_in_pre, psEncCtrl->PredCoef, psEncCtrl->Gains,
1.115 + psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
1.116 +
1.117 + /* Copy to prediction struct for use in next frame for interpolation */
1.118 + silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
1.119 +}
1.120 +
