Chris@69: /*********************************************************************** Chris@69: Copyright (c) 2006-2011, Skype Limited. All rights reserved. Chris@69: Redistribution and use in source and binary forms, with or without Chris@69: modification, are permitted provided that the following conditions Chris@69: are met: Chris@69: - Redistributions of source code must retain the above copyright notice, Chris@69: this list of conditions and the following disclaimer. Chris@69: - Redistributions in binary form must reproduce the above copyright Chris@69: notice, this list of conditions and the following disclaimer in the Chris@69: documentation and/or other materials provided with the distribution. Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the Chris@69: names of specific contributors, may be used to endorse or promote Chris@69: products derived from this software without specific prior written Chris@69: permission. Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" Chris@69: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE Chris@69: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Chris@69: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE Chris@69: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR Chris@69: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF Chris@69: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS Chris@69: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN Chris@69: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) Chris@69: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE Chris@69: POSSIBILITY OF SUCH DAMAGE. Chris@69: ***********************************************************************/ Chris@69: Chris@69: #ifdef HAVE_CONFIG_H Chris@69: #include "config.h" Chris@69: #endif Chris@69: Chris@69: #include "main_FLP.h" Chris@69: Chris@69: /* Find LPC and LTP coefficients */ Chris@69: void silk_find_pred_coefs_FLP( Chris@69: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ Chris@69: silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ Chris@69: const silk_float res_pitch[], /* I Residual from pitch analysis */ Chris@69: const silk_float x[], /* I Speech signal */ Chris@69: opus_int condCoding /* I The type of conditional coding to use */ Chris@69: ) Chris@69: { Chris@69: opus_int i; Chris@69: silk_float XXLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ]; Chris@69: silk_float xXLTP[ MAX_NB_SUBFR * LTP_ORDER ]; Chris@69: silk_float invGains[ MAX_NB_SUBFR ]; Chris@69: opus_int16 NLSF_Q15[ MAX_LPC_ORDER ]; Chris@69: const silk_float *x_ptr; Chris@69: silk_float *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ]; Chris@69: silk_float minInvGain; Chris@69: Chris@69: /* Weighting for weighted least squares */ Chris@69: for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { Chris@69: silk_assert( psEncCtrl->Gains[ i ] > 0.0f ); Chris@69: invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ]; Chris@69: } Chris@69: Chris@69: if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { Chris@69: /**********/ Chris@69: /* VOICED */ Chris@69: /**********/ Chris@69: celt_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 ); Chris@69: Chris@69: /* LTP analysis */ Chris@69: silk_find_LTP_FLP( XXLTP, xXLTP, res_pitch, psEncCtrl->pitchL, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr ); Chris@69: Chris@69: /* Quantize LTP gain parameters */ Chris@69: silk_quant_LTP_gains_FLP( psEncCtrl->LTPCoef, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex, Chris@69: &psEnc->sCmn.sum_log_gain_Q7, &psEncCtrl->LTPredCodGain, XXLTP, xXLTP, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.arch ); Chris@69: Chris@69: /* Control LTP scaling */ Chris@69: silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding ); Chris@69: Chris@69: /* Create LTP residual */ Chris@69: silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef, Chris@69: psEncCtrl->pitchL, invGains, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); Chris@69: } else { Chris@69: /************/ Chris@69: /* UNVOICED */ Chris@69: /************/ Chris@69: /* Create signal with prepended subframes, scaled by inverse gains */ Chris@69: x_ptr = x - psEnc->sCmn.predictLPCOrder; Chris@69: x_pre_ptr = LPC_in_pre; Chris@69: for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { Chris@69: silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ], Chris@69: psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder ); Chris@69: x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder; Chris@69: x_ptr += psEnc->sCmn.subfr_length; Chris@69: } Chris@69: silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) ); Chris@69: psEncCtrl->LTPredCodGain = 0.0f; Chris@69: psEnc->sCmn.sum_log_gain_Q7 = 0; Chris@69: } Chris@69: Chris@69: /* Limit on total predictive coding gain */ Chris@69: if( psEnc->sCmn.first_frame_after_reset ) { Chris@69: minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET; Chris@69: } else { Chris@69: minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) / MAX_PREDICTION_POWER_GAIN; Chris@69: minInvGain /= 0.25f + 0.75f * psEncCtrl->coding_quality; Chris@69: } Chris@69: Chris@69: /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */ Chris@69: silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain ); Chris@69: Chris@69: /* Quantize LSFs */ Chris@69: silk_process_NLSFs_FLP( &psEnc->sCmn, psEncCtrl->PredCoef, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 ); Chris@69: Chris@69: /* Calculate residual energy using quantized LPC coefficients */ Chris@69: silk_residual_energy_FLP( psEncCtrl->ResNrg, LPC_in_pre, psEncCtrl->PredCoef, psEncCtrl->Gains, Chris@69: psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); Chris@69: Chris@69: /* Copy to prediction struct for use in next frame for interpolation */ Chris@69: silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) ); Chris@69: } Chris@69: