michael@0: /*********************************************************************** michael@0: Copyright (c) 2006-2011, Skype Limited. All rights reserved. michael@0: Redistribution and use in source and binary forms, with or without michael@0: modification, are permitted provided that the following conditions michael@0: are met: michael@0: - Redistributions of source code must retain the above copyright notice, michael@0: this list of conditions and the following disclaimer. michael@0: - Redistributions in binary form must reproduce the above copyright michael@0: notice, this list of conditions and the following disclaimer in the michael@0: documentation and/or other materials provided with the distribution. michael@0: - Neither the name of Internet Society, IETF or IETF Trust, nor the michael@0: names of specific contributors, may be used to endorse or promote michael@0: products derived from this software without specific prior written michael@0: permission. michael@0: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" michael@0: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE michael@0: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE michael@0: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE michael@0: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR michael@0: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF michael@0: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS michael@0: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN michael@0: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) michael@0: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE michael@0: POSSIBILITY OF SUCH DAMAGE. michael@0: ***********************************************************************/ michael@0: michael@0: #ifdef HAVE_CONFIG_H michael@0: #include "config.h" michael@0: #endif michael@0: michael@0: #include "main_FLP.h" michael@0: michael@0: /* Find LPC and LTP coefficients */ michael@0: void silk_find_pred_coefs_FLP( michael@0: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ michael@0: silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ michael@0: const silk_float res_pitch[], /* I Residual from pitch analysis */ michael@0: const silk_float x[], /* I Speech signal */ michael@0: opus_int condCoding /* I The type of conditional coding to use */ michael@0: ) michael@0: { michael@0: opus_int i; michael@0: silk_float WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ]; michael@0: silk_float invGains[ MAX_NB_SUBFR ], Wght[ MAX_NB_SUBFR ]; michael@0: opus_int16 NLSF_Q15[ MAX_LPC_ORDER ]; michael@0: const silk_float *x_ptr; michael@0: silk_float *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ]; michael@0: silk_float minInvGain; michael@0: michael@0: /* Weighting for weighted least squares */ michael@0: for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { michael@0: silk_assert( psEncCtrl->Gains[ i ] > 0.0f ); michael@0: invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ]; michael@0: Wght[ i ] = invGains[ i ] * invGains[ i ]; michael@0: } michael@0: michael@0: if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { michael@0: /**********/ michael@0: /* VOICED */ michael@0: /**********/ michael@0: silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 ); michael@0: michael@0: /* LTP analysis */ michael@0: silk_find_LTP_FLP( psEncCtrl->LTPCoef, WLTP, &psEncCtrl->LTPredCodGain, res_pitch, michael@0: psEncCtrl->pitchL, Wght, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length ); michael@0: michael@0: /* Quantize LTP gain parameters */ michael@0: silk_quant_LTP_gains_FLP( psEncCtrl->LTPCoef, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex, michael@0: &psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr ); michael@0: michael@0: /* Control LTP scaling */ michael@0: silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding ); michael@0: michael@0: /* Create LTP residual */ michael@0: silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef, michael@0: psEncCtrl->pitchL, invGains, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); michael@0: } else { michael@0: /************/ michael@0: /* UNVOICED */ michael@0: /************/ michael@0: /* Create signal with prepended subframes, scaled by inverse gains */ michael@0: x_ptr = x - psEnc->sCmn.predictLPCOrder; michael@0: x_pre_ptr = LPC_in_pre; michael@0: for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { michael@0: silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ], michael@0: psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder ); michael@0: x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder; michael@0: x_ptr += psEnc->sCmn.subfr_length; michael@0: } michael@0: silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) ); michael@0: psEncCtrl->LTPredCodGain = 0.0f; michael@0: psEnc->sCmn.sum_log_gain_Q7 = 0; michael@0: } michael@0: michael@0: /* Limit on total predictive coding gain */ michael@0: if( psEnc->sCmn.first_frame_after_reset ) { michael@0: minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET; michael@0: } else { michael@0: minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) / MAX_PREDICTION_POWER_GAIN; michael@0: minInvGain /= 0.25f + 0.75f * psEncCtrl->coding_quality; michael@0: } michael@0: michael@0: /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */ michael@0: silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain ); michael@0: michael@0: /* Quantize LSFs */ michael@0: silk_process_NLSFs_FLP( &psEnc->sCmn, psEncCtrl->PredCoef, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 ); michael@0: michael@0: /* Calculate residual energy using quantized LPC coefficients */ michael@0: silk_residual_energy_FLP( psEncCtrl->ResNrg, LPC_in_pre, psEncCtrl->PredCoef, psEncCtrl->Gains, michael@0: psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); michael@0: michael@0: /* Copy to prediction struct for use in next frame for interpolation */ michael@0: silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) ); michael@0: } michael@0: