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annotate src/opus-1.3/silk/float/find_pred_coefs_FLP.c @ 83:ae30d91d2ffe

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Replace these with versions built using an older toolset (so as to avoid ABI compatibilities when linking on Ubuntu 14.04 for packaging purposes)
author Chris Cannam
date Fri, 07 Feb 2020 11:51:13 +0000
parents 7aeed7906520
children
rev   line source
Chris@69 1 /***********************************************************************
Chris@69 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Chris@69 3 Redistribution and use in source and binary forms, with or without
Chris@69 4 modification, are permitted provided that the following conditions
Chris@69 5 are met:
Chris@69 6 - Redistributions of source code must retain the above copyright notice,
Chris@69 7 this list of conditions and the following disclaimer.
Chris@69 8 - Redistributions in binary form must reproduce the above copyright
Chris@69 9 notice, this list of conditions and the following disclaimer in the
Chris@69 10 documentation and/or other materials provided with the distribution.
Chris@69 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69 12 names of specific contributors, may be used to endorse or promote
Chris@69 13 products derived from this software without specific prior written
Chris@69 14 permission.
Chris@69 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Chris@69 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Chris@69 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Chris@69 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
Chris@69 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
Chris@69 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
Chris@69 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Chris@69 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Chris@69 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
Chris@69 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Chris@69 25 POSSIBILITY OF SUCH DAMAGE.
Chris@69 26 ***********************************************************************/
Chris@69 27
Chris@69 28 #ifdef HAVE_CONFIG_H
Chris@69 29 #include "config.h"
Chris@69 30 #endif
Chris@69 31
Chris@69 32 #include "main_FLP.h"
Chris@69 33
Chris@69 34 /* Find LPC and LTP coefficients */
Chris@69 35 void silk_find_pred_coefs_FLP(
Chris@69 36 silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
Chris@69 37 silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
Chris@69 38 const silk_float res_pitch[], /* I Residual from pitch analysis */
Chris@69 39 const silk_float x[], /* I Speech signal */
Chris@69 40 opus_int condCoding /* I The type of conditional coding to use */
Chris@69 41 )
Chris@69 42 {
Chris@69 43 opus_int i;
Chris@69 44 silk_float XXLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ];
Chris@69 45 silk_float xXLTP[ MAX_NB_SUBFR * LTP_ORDER ];
Chris@69 46 silk_float invGains[ MAX_NB_SUBFR ];
Chris@69 47 opus_int16 NLSF_Q15[ MAX_LPC_ORDER ];
Chris@69 48 const silk_float *x_ptr;
Chris@69 49 silk_float *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ];
Chris@69 50 silk_float minInvGain;
Chris@69 51
Chris@69 52 /* Weighting for weighted least squares */
Chris@69 53 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
Chris@69 54 silk_assert( psEncCtrl->Gains[ i ] > 0.0f );
Chris@69 55 invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ];
Chris@69 56 }
Chris@69 57
Chris@69 58 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
Chris@69 59 /**********/
Chris@69 60 /* VOICED */
Chris@69 61 /**********/
Chris@69 62 celt_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 );
Chris@69 63
Chris@69 64 /* LTP analysis */
Chris@69 65 silk_find_LTP_FLP( XXLTP, xXLTP, res_pitch, psEncCtrl->pitchL, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr );
Chris@69 66
Chris@69 67 /* Quantize LTP gain parameters */
Chris@69 68 silk_quant_LTP_gains_FLP( psEncCtrl->LTPCoef, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex,
Chris@69 69 &psEnc->sCmn.sum_log_gain_Q7, &psEncCtrl->LTPredCodGain, XXLTP, xXLTP, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.arch );
Chris@69 70
Chris@69 71 /* Control LTP scaling */
Chris@69 72 silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding );
Chris@69 73
Chris@69 74 /* Create LTP residual */
Chris@69 75 silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef,
Chris@69 76 psEncCtrl->pitchL, invGains, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
Chris@69 77 } else {
Chris@69 78 /************/
Chris@69 79 /* UNVOICED */
Chris@69 80 /************/
Chris@69 81 /* Create signal with prepended subframes, scaled by inverse gains */
Chris@69 82 x_ptr = x - psEnc->sCmn.predictLPCOrder;
Chris@69 83 x_pre_ptr = LPC_in_pre;
Chris@69 84 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) {
Chris@69 85 silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ],
Chris@69 86 psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder );
Chris@69 87 x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder;
Chris@69 88 x_ptr += psEnc->sCmn.subfr_length;
Chris@69 89 }
Chris@69 90 silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) );
Chris@69 91 psEncCtrl->LTPredCodGain = 0.0f;
Chris@69 92 psEnc->sCmn.sum_log_gain_Q7 = 0;
Chris@69 93 }
Chris@69 94
Chris@69 95 /* Limit on total predictive coding gain */
Chris@69 96 if( psEnc->sCmn.first_frame_after_reset ) {
Chris@69 97 minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET;
Chris@69 98 } else {
Chris@69 99 minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) / MAX_PREDICTION_POWER_GAIN;
Chris@69 100 minInvGain /= 0.25f + 0.75f * psEncCtrl->coding_quality;
Chris@69 101 }
Chris@69 102
Chris@69 103 /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */
Chris@69 104 silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain );
Chris@69 105
Chris@69 106 /* Quantize LSFs */
Chris@69 107 silk_process_NLSFs_FLP( &psEnc->sCmn, psEncCtrl->PredCoef, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 );
Chris@69 108
Chris@69 109 /* Calculate residual energy using quantized LPC coefficients */
Chris@69 110 silk_residual_energy_FLP( psEncCtrl->ResNrg, LPC_in_pre, psEncCtrl->PredCoef, psEncCtrl->Gains,
Chris@69 111 psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder );
Chris@69 112
Chris@69 113 /* Copy to prediction struct for use in next frame for interpolation */
Chris@69 114 silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) );
Chris@69 115 }
Chris@69 116