1 /*********************************************************************** 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. 3 Redistribution and use in source and binary forms, with or without 4 modification, are permitted provided that the following conditions 5 are met: 6 - Redistributions of source code must retain the above copyright notice, 7 this list of conditions and the following disclaimer. 8 - Redistributions in binary form must reproduce the above copyright 9 notice, this list of conditions and the following disclaimer in the 10 documentation and/or other materials provided with the distribution. 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the 12 names of specific contributors, may be used to endorse or promote 13 products derived from this software without specific prior written 14 permission. 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 POSSIBILITY OF SUCH DAMAGE. 26 ***********************************************************************/ 27 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include "main_FIX.h" 33 #include "stack_alloc.h" 34 35 void silk_find_pred_coefs_FIX( 36 silk_encoder_state_FIX *psEnc, /* I/O encoder state */ 37 silk_encoder_control_FIX *psEncCtrl, /* I/O encoder control */ 38 const opus_int16 res_pitch[], /* I Residual from pitch analysis */ 39 const opus_int16 x[], /* I Speech signal */ 40 opus_int condCoding /* I The type of conditional coding to use */ 41 ) 42 { 43 opus_int i; 44 opus_int32 invGains_Q16[ MAX_NB_SUBFR ], local_gains[ MAX_NB_SUBFR ], Wght_Q15[ MAX_NB_SUBFR ]; 45 opus_int16 NLSF_Q15[ MAX_LPC_ORDER ]; 46 const opus_int16 *x_ptr; 47 opus_int16 *x_pre_ptr; 48 VARDECL( opus_int16, LPC_in_pre ); 49 opus_int32 tmp, min_gain_Q16, minInvGain_Q30; 50 opus_int LTP_corrs_rshift[ MAX_NB_SUBFR ]; 51 SAVE_STACK; 52 53 /* weighting for weighted least squares */ 54 min_gain_Q16 = silk_int32_MAX >> 6; 55 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { 56 min_gain_Q16 = silk_min( min_gain_Q16, psEncCtrl->Gains_Q16[ i ] ); 57 } 58 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { 59 /* Divide to Q16 */ 60 silk_assert( psEncCtrl->Gains_Q16[ i ] > 0 ); 61 /* Invert and normalize gains, and ensure that maximum invGains_Q16 is within range of a 16 bit int */ 62 invGains_Q16[ i ] = silk_DIV32_varQ( min_gain_Q16, psEncCtrl->Gains_Q16[ i ], 16 - 2 ); 63 64 /* Ensure Wght_Q15 a minimum value 1 */ 65 invGains_Q16[ i ] = silk_max( invGains_Q16[ i ], 363 ); 66 67 /* Square the inverted gains */ 68 silk_assert( invGains_Q16[ i ] == silk_SAT16( invGains_Q16[ i ] ) ); 69 tmp = silk_SMULWB( invGains_Q16[ i ], invGains_Q16[ i ] ); 70 Wght_Q15[ i ] = silk_RSHIFT( tmp, 1 ); 71 72 /* Invert the inverted and normalized gains */ 73 local_gains[ i ] = silk_DIV32( ( (opus_int32)1 << 16 ), invGains_Q16[ i ] ); 74 } 75 76 ALLOC( LPC_in_pre, 77 psEnc->sCmn.nb_subfr * psEnc->sCmn.predictLPCOrder 78 + psEnc->sCmn.frame_length, opus_int16 ); 79 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { 80 VARDECL( opus_int32, WLTP ); 81 82 /**********/ 83 /* VOICED */ 84 /**********/ 85 silk_assert( psEnc->sCmn.ltp_mem_length - psEnc->sCmn.predictLPCOrder >= psEncCtrl->pitchL[ 0 ] + LTP_ORDER / 2 ); 86 87 ALLOC( WLTP, psEnc->sCmn.nb_subfr * LTP_ORDER * LTP_ORDER, opus_int32 ); 88 89 /* LTP analysis */ 90 silk_find_LTP_FIX( psEncCtrl->LTPCoef_Q14, WLTP, &psEncCtrl->LTPredCodGain_Q7, 91 res_pitch, psEncCtrl->pitchL, Wght_Q15, psEnc->sCmn.subfr_length, 92 psEnc->sCmn.nb_subfr, psEnc->sCmn.ltp_mem_length, LTP_corrs_rshift ); 93 94 /* Quantize LTP gain parameters */ 95 silk_quant_LTP_gains( psEncCtrl->LTPCoef_Q14, psEnc->sCmn.indices.LTPIndex, &psEnc->sCmn.indices.PERIndex, 96 WLTP, psEnc->sCmn.mu_LTP_Q9, psEnc->sCmn.LTPQuantLowComplexity, psEnc->sCmn.nb_subfr); 97 98 /* Control LTP scaling */ 99 silk_LTP_scale_ctrl_FIX( psEnc, psEncCtrl, condCoding ); 100 101 /* Create LTP residual */ 102 silk_LTP_analysis_filter_FIX( LPC_in_pre, x - psEnc->sCmn.predictLPCOrder, psEncCtrl->LTPCoef_Q14, 103 psEncCtrl->pitchL, invGains_Q16, psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); 104 105 } else { 106 /************/ 107 /* UNVOICED */ 108 /************/ 109 /* Create signal with prepended subframes, scaled by inverse gains */ 110 x_ptr = x - psEnc->sCmn.predictLPCOrder; 111 x_pre_ptr = LPC_in_pre; 112 for( i = 0; i < psEnc->sCmn.nb_subfr; i++ ) { 113 silk_scale_copy_vector16( x_pre_ptr, x_ptr, invGains_Q16[ i ], 114 psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder ); 115 x_pre_ptr += psEnc->sCmn.subfr_length + psEnc->sCmn.predictLPCOrder; 116 x_ptr += psEnc->sCmn.subfr_length; 117 } 118 119 silk_memset( psEncCtrl->LTPCoef_Q14, 0, psEnc->sCmn.nb_subfr * LTP_ORDER * sizeof( opus_int16 ) ); 120 psEncCtrl->LTPredCodGain_Q7 = 0; 121 } 122 123 /* Limit on total predictive coding gain */ 124 if( psEnc->sCmn.first_frame_after_reset ) { 125 minInvGain_Q30 = SILK_FIX_CONST( 1.0f / MAX_PREDICTION_POWER_GAIN_AFTER_RESET, 30 ); 126 } else { 127 minInvGain_Q30 = silk_log2lin( silk_SMLAWB( 16 << 7, (opus_int32)psEncCtrl->LTPredCodGain_Q7, SILK_FIX_CONST( 1.0 / 3, 16 ) ) ); /* Q16 */ 128 minInvGain_Q30 = silk_DIV32_varQ( minInvGain_Q30, 129 silk_SMULWW( SILK_FIX_CONST( MAX_PREDICTION_POWER_GAIN, 0 ), 130 silk_SMLAWB( SILK_FIX_CONST( 0.25, 18 ), SILK_FIX_CONST( 0.75, 18 ), psEncCtrl->coding_quality_Q14 ) ), 14 ); 131 } 132 133 /* LPC_in_pre contains the LTP-filtered input for voiced, and the unfiltered input for unvoiced */ 134 silk_find_LPC_FIX( &psEnc->sCmn, NLSF_Q15, LPC_in_pre, minInvGain_Q30 ); 135 136 /* Quantize LSFs */ 137 silk_process_NLSFs( &psEnc->sCmn, psEncCtrl->PredCoef_Q12, NLSF_Q15, psEnc->sCmn.prev_NLSFq_Q15 ); 138 139 /* Calculate residual energy using quantized LPC coefficients */ 140 silk_residual_energy_FIX( psEncCtrl->ResNrg, psEncCtrl->ResNrgQ, LPC_in_pre, psEncCtrl->PredCoef_Q12, local_gains, 141 psEnc->sCmn.subfr_length, psEnc->sCmn.nb_subfr, psEnc->sCmn.predictLPCOrder ); 142 143 /* Copy to prediction struct for use in next frame for interpolation */ 144 silk_memcpy( psEnc->sCmn.prev_NLSFq_Q15, NLSF_Q15, sizeof( psEnc->sCmn.prev_NLSFq_Q15 ) ); 145 RESTORE_STACK; 146 } 147
