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_FIX.h" Chris@69: #include "stack_alloc.h" Chris@69: Chris@69: void silk_find_pred_coefs_FIX( Chris@69: silk_encoder_state_FIX *psEnc, /* I/O encoder state */ Chris@69: silk_encoder_control_FIX *psEncCtrl, /* I/O encoder control */ Chris@69: const opus_int16 res_pitch[], /* I Residual from pitch analysis */ Chris@69: const opus_int16 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: opus_int32 invGains_Q16[ MAX_NB_SUBFR ], local_gains[ MAX_NB_SUBFR ]; Chris@69: opus_int16 NLSF_Q15[ MAX_LPC_ORDER ]; Chris@69: const opus_int16 *x_ptr; Chris@69: opus_int16 *x_pre_ptr; Chris@69: VARDECL( opus_int16, LPC_in_pre ); Chris@69: opus_int32 min_gain_Q16, minInvGain_Q30; Chris@69: SAVE_STACK; Chris@69: Chris@69: /* weighting for weighted least squares */ Chris@69: min_gain_Q16 = silk_int32_MAX >> 6; Chris@69: for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { Chris@69: min_gain_Q16 = silk_min( min_gain_Q16, psEncCtrl->Gains_Q16[ i ] ); Chris@69: } Chris@69: for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { Chris@69: /* Divide to Q16 */ Chris@69: silk_assert( psEncCtrl->Gains_Q16[ i ] > 0 ); Chris@69: /* Invert and normalize gains, and ensure that maximum invGains_Q16 is within range of a 16 bit int */ Chris@69: invGains_Q16[ i ] = silk_DIV32_varQ( min_gain_Q16, psEncCtrl->Gains_Q16[ i ], 16 - 2 ); Chris@69: Chris@69: /* Limit inverse */ Chris@69: invGains_Q16[ i ] = silk_max( invGains_Q16[ i ], 100 ); Chris@69: Chris@69: /* Square the inverted gains */ Chris@69: silk_assert( invGains_Q16[ i ] == silk_SAT16( invGains_Q16[ i ] ) ); Chris@69: Chris@69: /* Invert the inverted and normalized gains */ Chris@69: local_gains[ i ] = silk_DIV32( ( (opus_int32)1 << 16 ), invGains_Q16[ i ] ); Chris@69: } Chris@69: Chris@69: ALLOC( LPC_in_pre, Chris@69: psEnc->sCmn.nb_subfr * psEnc->sCmn.predictLPCOrder Chris@69: + psEnc->sCmn.frame_length, opus_int16 ); Chris@69: if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { Chris@69: VARDECL( opus_int32, xXLTP_Q17 ); Chris@69: VARDECL( opus_int32, XXLTP_Q17 ); Chris@69: 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: ALLOC( xXLTP_Q17, psEnc->sCmn.nb_subfr * LTP_ORDER, opus_int32 ); Chris@69: ALLOC( XXLTP_Q17, psEnc->sCmn.nb_subfr * LTP_ORDER * LTP_ORDER, opus_int32 ); Chris@69: Chris@69: /* LTP analysis */ Chris@69: silk_find_LTP_FIX( XXLTP_Q17, xXLTP_Q17, res_pitch, Chris@69: psEncCtrl->pitchL, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.arch ); Chris@69: Chris@69: /* Quantize LTP gain parameters */ Chris@69: silk_quant_LTP_gains( psEncCtrl->LTPCoef_Q14, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex, Chris@69: &psEnc->sCmn.sum_log_gain_Q7, &psEncCtrl->LTPredCodGain_Q7, XXLTP_Q17, xXLTP_Q17, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.arch ); Chris@69: Chris@69: /* Control LTP scaling */ Chris@69: silk_LTP_scale_ctrl_FIX( psEnc, psEncCtrl, condCoding ); Chris@69: Chris@69: /* Create LTP residual */ Chris@69: silk_LTP_analysis_filter_FIX( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef_Q14, Chris@69: psEncCtrl->pitchL, invGains_Q16, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); Chris@69: 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_vector16( x_pre_ptr, x_ptr, invGains_Q16[ 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: Chris@69: silk_memset( psEncCtrl->LTPCoef_Q14, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( opus_int16 ) ); Chris@69: psEncCtrl->LTPredCodGain_Q7 = 0; 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_Q30 = SILK_FIX_CONST( 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET, 30 ); Chris@69: } else { Chris@69: minInvGain_Q30 = silk_log2lin( silk_SMLAWB( 16 << 7, (opus_int32)psEncCtrl->LTPredCodGain_Q7, SILK_FIX_CONST( 1.0 / 3, 16 ) ) ); /* Q16 */ Chris@69: minInvGain_Q30 = silk_DIV32_varQ( minInvGain_Q30, Chris@69: silk_SMULWW( SILK_FIX_CONST( MAX_PREDICTION_POWER_GAIN, 0 ), Chris@69: silk_SMLAWB( SILK_FIX_CONST( 0.25, 18 ), SILK_FIX_CONST( 0.75, 18 ), psEncCtrl->coding_quality_Q14 ) ), 14 ); 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_FIX( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain_Q30 ); Chris@69: Chris@69: /* Quantize LSFs */ Chris@69: silk_process_NLSFs( &psEnc->sCmn, psEncCtrl->PredCoef_Q12, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 ); Chris@69: Chris@69: /* Calculate residual energy using quantized LPC coefficients */ Chris@69: silk_residual_energy_FIX( psEncCtrl->ResNrg, psEncCtrl->ResNrgQ, LPC_in_pre, psEncCtrl->PredCoef_Q12, local_gains, Chris@69: psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder, psEnc->sCmn.arch ); 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: RESTORE_STACK; Chris@69: }