cannam@154: /*********************************************************************** cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved. cannam@154: Redistribution and use in source and binary forms, with or without cannam@154: modification, are permitted provided that the following conditions cannam@154: are met: cannam@154: - Redistributions of source code must retain the above copyright notice, cannam@154: this list of conditions and the following disclaimer. cannam@154: - Redistributions in binary form must reproduce the above copyright cannam@154: notice, this list of conditions and the following disclaimer in the cannam@154: documentation and/or other materials provided with the distribution. cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the cannam@154: names of specific contributors, may be used to endorse or promote cannam@154: products derived from this software without specific prior written cannam@154: permission. cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE cannam@154: POSSIBILITY OF SUCH DAMAGE. cannam@154: ***********************************************************************/ cannam@154: cannam@154: #ifdef HAVE_CONFIG_H cannam@154: #include "config.h" cannam@154: #endif cannam@154: cannam@154: #include "main_FLP.h" cannam@154: cannam@154: /* Find LPC and LTP coefficients */ cannam@154: void silk_find_pred_coefs_FLP( cannam@154: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ cannam@154: silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ cannam@154: const silk_float res_pitch[], /* I Residual from pitch analysis */ cannam@154: const silk_float x[], /* I Speech signal */ cannam@154: opus_int condCoding /* I The type of conditional coding to use */ cannam@154: ) cannam@154: { cannam@154: opus_int i; cannam@154: silk_float XXLTP[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ]; cannam@154: silk_float xXLTP[ MAX_NB_SUBFR * LTP_ORDER ]; cannam@154: silk_float invGains[ MAX_NB_SUBFR ]; cannam@154: opus_int16 NLSF_Q15[ MAX_LPC_ORDER ]; cannam@154: const silk_float *x_ptr; cannam@154: silk_float *x_pre_ptr, LPC_in_pre[ MAX_NB_SUBFR * MAX_LPC_ORDER + MAX_FRAME_LENGTH ]; cannam@154: silk_float minInvGain; cannam@154: cannam@154: /* Weighting for weighted least squares */ cannam@154: for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { cannam@154: silk_assert( psEncCtrl->Gains[ i ] > 0.0f ); cannam@154: invGains[ i ] = 1.0f / psEncCtrl->Gains[ i ]; cannam@154: } cannam@154: cannam@154: if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { cannam@154: /**********/ cannam@154: /* VOICED */ cannam@154: /**********/ cannam@154: celt_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 ); cannam@154: cannam@154: /* LTP analysis */ cannam@154: silk_find_LTP_FLP( XXLTP, xXLTP, res_pitch, psEncCtrl->pitchL, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr ); cannam@154: cannam@154: /* Quantize LTP gain parameters */ cannam@154: silk_quant_LTP_gains_FLP( psEncCtrl->LTPCoef, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex, cannam@154: &psEnc->sCmn.sum_log_gain_Q7, &psEncCtrl->LTPredCodGain, XXLTP, xXLTP, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.arch ); cannam@154: cannam@154: /* Control LTP scaling */ cannam@154: silk_LTP_scale_ctrl_FLP( psEnc, psEncCtrl, condCoding ); cannam@154: cannam@154: /* Create LTP residual */ cannam@154: silk_LTP_analysis_filter_FLP( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef, cannam@154: psEncCtrl->pitchL, invGains, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); cannam@154: } else { cannam@154: /************/ cannam@154: /* UNVOICED */ cannam@154: /************/ cannam@154: /* Create signal with prepended subframes, scaled by inverse gains */ cannam@154: x_ptr = x - psEnc->sCmn.predictLPCOrder; cannam@154: x_pre_ptr = LPC_in_pre; cannam@154: for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { cannam@154: silk_scale_copy_vector_FLP( x_pre_ptr, x_ptr, invGains[ i ], cannam@154: psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder ); cannam@154: x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder; cannam@154: x_ptr += psEnc->sCmn.subfr_length; cannam@154: } cannam@154: silk_memset( psEncCtrl->LTPCoef, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( silk_float ) ); cannam@154: psEncCtrl->LTPredCodGain = 0.0f; cannam@154: psEnc->sCmn.sum_log_gain_Q7 = 0; cannam@154: } cannam@154: cannam@154: /* Limit on total predictive coding gain */ cannam@154: if( psEnc->sCmn.first_frame_after_reset ) { cannam@154: minInvGain = 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET; cannam@154: } else { cannam@154: minInvGain = (silk_float)pow( 2, psEncCtrl->LTPredCodGain / 3 ) / MAX_PREDICTION_POWER_GAIN; cannam@154: minInvGain /= 0.25f + 0.75f * psEncCtrl->coding_quality; cannam@154: } cannam@154: cannam@154: /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */ cannam@154: silk_find_LPC_FLP( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain ); cannam@154: cannam@154: /* Quantize LSFs */ cannam@154: silk_process_NLSFs_FLP( &psEnc->sCmn, psEncCtrl->PredCoef, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 ); cannam@154: cannam@154: /* Calculate residual energy using quantized LPC coefficients */ cannam@154: silk_residual_energy_FLP( psEncCtrl->ResNrg, LPC_in_pre, psEncCtrl->PredCoef, psEncCtrl->Gains, cannam@154: psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); cannam@154: cannam@154: /* Copy to prediction struct for use in next frame for interpolation */ cannam@154: silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) ); cannam@154: } cannam@154: