| /*********************************************************************** |
| 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 "main_FLP.h" |
| |
| /* Find LPC and LTP coefficients */ |
| void silk_find_pred_coefs_FLP( |
| silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ |
| silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ |
| const silk_float res_pitch[], /* I Residual from pitch analysis */ |
| const silk_float x[], /* I Speech signal */ |
| opus_int condCoding /* I The type of conditional coding to use */ |
| ) |
| { |
| opus_int i; |
| silk_float WLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ]; |
| silk_float invGains[ MAX_NB_SUBFR ], Wght[ MAX_NB_SUBFR ]; |
| opus_int16 NLSF_Q15[ MAX_LPC_ORDER ]; |
| const silk_float *x_ptr; |
| silk_float *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ]; |
| silk_float minInvGain; |
| |
| /* Weighting for weighted least squares */ |
| for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { |
| silk_assert( psEncCtrl->Gains[ i ] > 0.0f ); |
| invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ]; |
| Wght[ i ] = invGains[ i ] * invGains[ i ]; |
| } |
| |
| if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { |
| /**********/ |
| /* VOICED */ |
| /**********/ |
| silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 ); |
| |
| /* LTP analysis */ |
| silk_find_LTP_FLP( psEncCtrl->LTPCoef, WLTP, &psEncCtrl->LTPredCodGain, res_pitch, |
| psEncCtrl->pitchL, Wght, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length ); |
| |
| /* Quantize LTP gain parameters */ |
| silk_quant_LTP_gains_FLP( psEncCtrl->LTPCoef, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex, |
| &psEnc->sCmn.sum_log_gain_Q7, WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr, |
| psEnc->sCmn.arch ); |
| |
| /* Control LTP scaling */ |
| silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding ); |
| |
| /* Create LTP residual */ |
| silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef, |
| psEncCtrl->pitchL, invGains, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); |
| } else { |
| /************/ |
| /* UNVOICED */ |
| /************/ |
| /* Create signal with prepended subframes, scaled by inverse gains */ |
| x_ptr = x - psEnc->sCmn.predictLPCOrder; |
| x_pre_ptr = LPC_in_pre; |
| for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { |
| silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ], |
| psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder ); |
| x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder; |
| x_ptr += psEnc->sCmn.subfr_length; |
| } |
| silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) ); |
| psEncCtrl->LTPredCodGain = 0.0f; |
| psEnc->sCmn.sum_log_gain_Q7 = 0; |
| } |
| |
| /* Limit on total predictive coding gain */ |
| if( psEnc->sCmn.first_frame_after_reset ) { |
| minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET; |
| } else { |
| minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) / MAX_PREDICTION_POWER_GAIN; |
| minInvGain /= 0.25f + 0.75f * psEncCtrl->coding_quality; |
| } |
| |
| /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */ |
| silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain ); |
| |
| /* Quantize LSFs */ |
| silk_process_NLSFs_FLP( &psEnc->sCmn, psEncCtrl->PredCoef, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 ); |
| |
| /* Calculate residual energy using quantized LPC coefficients */ |
| silk_residual_energy_FLP( psEncCtrl->ResNrg, LPC_in_pre, psEncCtrl->PredCoef, psEncCtrl->Gains, |
| psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); |
| |
| /* Copy to prediction struct for use in next frame for interpolation */ |
| silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) ); |
| } |
| |