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 #include "tuning_parameters.h" 35 36 /* Prefilter for finding Quantizer input signal */ 37 static OPUS_INLINE void silk_prefilt_FIX( 38 silk_prefilter_state_FIX *P, /* I/O state */ 39 opus_int32 st_res_Q12[], /* I short term residual signal */ 40 opus_int32 xw_Q3[], /* O prefiltered signal */ 41 opus_int32 HarmShapeFIRPacked_Q12, /* I Harmonic shaping coeficients */ 42 opus_int Tilt_Q14, /* I Tilt shaping coeficient */ 43 opus_int32 LF_shp_Q14, /* I Low-frequancy shaping coeficients */ 44 opus_int lag, /* I Lag for harmonic shaping */ 45 opus_int length /* I Length of signals */ 46 ); 47 48 void silk_warped_LPC_analysis_filter_FIX( 49 opus_int32 state[], /* I/O State [order + 1] */ 50 opus_int32 res_Q2[], /* O Residual signal [length] */ 51 const opus_int16 coef_Q13[], /* I Coefficients [order] */ 52 const opus_int16 input[], /* I Input signal [length] */ 53 const opus_int16 lambda_Q16, /* I Warping factor */ 54 const opus_int length, /* I Length of input signal */ 55 const opus_int order /* I Filter order (even) */ 56 ) 57 { 58 opus_int n, i; 59 opus_int32 acc_Q11, tmp1, tmp2; 60 61 /* Order must be even */ 62 silk_assert( ( order & 1 ) == 0 ); 63 64 for( n = 0; n < length; n++ ) { 65 /* Output of lowpass section */ 66 tmp2 = silk_SMLAWB( state[ 0 ], state[ 1 ], lambda_Q16 ); 67 state[ 0 ] = silk_LSHIFT( input[ n ], 14 ); 68 /* Output of allpass section */ 69 tmp1 = silk_SMLAWB( state[ 1 ], state[ 2 ] - tmp2, lambda_Q16 ); 70 state[ 1 ] = tmp2; 71 acc_Q11 = silk_RSHIFT( order, 1 ); 72 acc_Q11 = silk_SMLAWB( acc_Q11, tmp2, coef_Q13[ 0 ] ); 73 /* Loop over allpass sections */ 74 for( i = 2; i < order; i += 2 ) { 75 /* Output of allpass section */ 76 tmp2 = silk_SMLAWB( state[ i ], state[ i + 1 ] - tmp1, lambda_Q16 ); 77 state[ i ] = tmp1; 78 acc_Q11 = silk_SMLAWB( acc_Q11, tmp1, coef_Q13[ i - 1 ] ); 79 /* Output of allpass section */ 80 tmp1 = silk_SMLAWB( state[ i + 1 ], state[ i + 2 ] - tmp2, lambda_Q16 ); 81 state[ i + 1 ] = tmp2; 82 acc_Q11 = silk_SMLAWB( acc_Q11, tmp2, coef_Q13[ i ] ); 83 } 84 state[ order ] = tmp1; 85 acc_Q11 = silk_SMLAWB( acc_Q11, tmp1, coef_Q13[ order - 1 ] ); 86 res_Q2[ n ] = silk_LSHIFT( (opus_int32)input[ n ], 2 ) - silk_RSHIFT_ROUND( acc_Q11, 9 ); 87 } 88 } 89 90 void silk_prefilter_FIX( 91 silk_encoder_state_FIX *psEnc, /* I/O Encoder state */ 92 const silk_encoder_control_FIX *psEncCtrl, /* I Encoder control */ 93 opus_int32 xw_Q3[], /* O Weighted signal */ 94 const opus_int16 x[] /* I Speech signal */ 95 ) 96 { 97 silk_prefilter_state_FIX *P = &psEnc->sPrefilt; 98 opus_int j, k, lag; 99 opus_int32 tmp_32; 100 const opus_int16 *AR1_shp_Q13; 101 const opus_int16 *px; 102 opus_int32 *pxw_Q3; 103 opus_int HarmShapeGain_Q12, Tilt_Q14; 104 opus_int32 HarmShapeFIRPacked_Q12, LF_shp_Q14; 105 VARDECL( opus_int32, x_filt_Q12 ); 106 VARDECL( opus_int32, st_res_Q2 ); 107 opus_int16 B_Q10[ 2 ]; 108 SAVE_STACK; 109 110 /* Set up pointers */ 111 px = x; 112 pxw_Q3 = xw_Q3; 113 lag = P->lagPrev; 114 ALLOC( x_filt_Q12, psEnc->sCmn.subfr_length, opus_int32 ); 115 ALLOC( st_res_Q2, psEnc->sCmn.subfr_length, opus_int32 ); 116 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { 117 /* Update Variables that change per sub frame */ 118 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { 119 lag = psEncCtrl->pitchL[ k ]; 120 } 121 122 /* Noise shape parameters */ 123 HarmShapeGain_Q12 = silk_SMULWB( (opus_int32)psEncCtrl->HarmShapeGain_Q14[ k ], 16384 - psEncCtrl->HarmBoost_Q14[ k ] ); 124 silk_assert( HarmShapeGain_Q12 >= 0 ); 125 HarmShapeFIRPacked_Q12 = silk_RSHIFT( HarmShapeGain_Q12, 2 ); 126 HarmShapeFIRPacked_Q12 |= silk_LSHIFT( (opus_int32)silk_RSHIFT( HarmShapeGain_Q12, 1 ), 16 ); 127 Tilt_Q14 = psEncCtrl->Tilt_Q14[ k ]; 128 LF_shp_Q14 = psEncCtrl->LF_shp_Q14[ k ]; 129 AR1_shp_Q13 = &psEncCtrl->AR1_Q13[ k * MAX_SHAPE_LPC_ORDER ]; 130 131 /* Short term FIR filtering*/ 132 silk_warped_LPC_analysis_filter_FIX( P->sAR_shp, st_res_Q2, AR1_shp_Q13, px, 133 psEnc->sCmn.warping_Q16, psEnc->sCmn.subfr_length, psEnc->sCmn.shapingLPCOrder ); 134 135 /* Reduce (mainly) low frequencies during harmonic emphasis */ 136 B_Q10[ 0 ] = silk_RSHIFT_ROUND( psEncCtrl->GainsPre_Q14[ k ], 4 ); 137 tmp_32 = silk_SMLABB( SILK_FIX_CONST( INPUT_TILT, 26 ), psEncCtrl->HarmBoost_Q14[ k ], HarmShapeGain_Q12 ); /* Q26 */ 138 tmp_32 = silk_SMLABB( tmp_32, psEncCtrl->coding_quality_Q14, SILK_FIX_CONST( HIGH_RATE_INPUT_TILT, 12 ) ); /* Q26 */ 139 tmp_32 = silk_SMULWB( tmp_32, -psEncCtrl->GainsPre_Q14[ k ] ); /* Q24 */ 140 tmp_32 = silk_RSHIFT_ROUND( tmp_32, 14 ); /* Q10 */ 141 B_Q10[ 1 ]= silk_SAT16( tmp_32 ); 142 x_filt_Q12[ 0 ] = silk_MLA( silk_MUL( st_res_Q2[ 0 ], B_Q10[ 0 ] ), P->sHarmHP_Q2, B_Q10[ 1 ] ); 143 for( j = 1; j < psEnc->sCmn.subfr_length; j++ ) { 144 x_filt_Q12[ j ] = silk_MLA( silk_MUL( st_res_Q2[ j ], B_Q10[ 0 ] ), st_res_Q2[ j - 1 ], B_Q10[ 1 ] ); 145 } 146 P->sHarmHP_Q2 = st_res_Q2[ psEnc->sCmn.subfr_length - 1 ]; 147 148 silk_prefilt_FIX( P, x_filt_Q12, pxw_Q3, HarmShapeFIRPacked_Q12, Tilt_Q14, LF_shp_Q14, lag, psEnc->sCmn.subfr_length ); 149 150 px += psEnc->sCmn.subfr_length; 151 pxw_Q3 += psEnc->sCmn.subfr_length; 152 } 153 154 P->lagPrev = psEncCtrl->pitchL[ psEnc->sCmn.nb_subfr - 1 ]; 155 RESTORE_STACK; 156 } 157 158 /* Prefilter for finding Quantizer input signal */ 159 static OPUS_INLINE void silk_prefilt_FIX( 160 silk_prefilter_state_FIX *P, /* I/O state */ 161 opus_int32 st_res_Q12[], /* I short term residual signal */ 162 opus_int32 xw_Q3[], /* O prefiltered signal */ 163 opus_int32 HarmShapeFIRPacked_Q12, /* I Harmonic shaping coeficients */ 164 opus_int Tilt_Q14, /* I Tilt shaping coeficient */ 165 opus_int32 LF_shp_Q14, /* I Low-frequancy shaping coeficients */ 166 opus_int lag, /* I Lag for harmonic shaping */ 167 opus_int length /* I Length of signals */ 168 ) 169 { 170 opus_int i, idx, LTP_shp_buf_idx; 171 opus_int32 n_LTP_Q12, n_Tilt_Q10, n_LF_Q10; 172 opus_int32 sLF_MA_shp_Q12, sLF_AR_shp_Q12; 173 opus_int16 *LTP_shp_buf; 174 175 /* To speed up use temp variables instead of using the struct */ 176 LTP_shp_buf = P->sLTP_shp; 177 LTP_shp_buf_idx = P->sLTP_shp_buf_idx; 178 sLF_AR_shp_Q12 = P->sLF_AR_shp_Q12; 179 sLF_MA_shp_Q12 = P->sLF_MA_shp_Q12; 180 181 for( i = 0; i < length; i++ ) { 182 if( lag > 0 ) { 183 /* unrolled loop */ 184 silk_assert( HARM_SHAPE_FIR_TAPS == 3 ); 185 idx = lag + LTP_shp_buf_idx; 186 n_LTP_Q12 = silk_SMULBB( LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 - 1) & LTP_MASK ], HarmShapeFIRPacked_Q12 ); 187 n_LTP_Q12 = silk_SMLABT( n_LTP_Q12, LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 ) & LTP_MASK ], HarmShapeFIRPacked_Q12 ); 188 n_LTP_Q12 = silk_SMLABB( n_LTP_Q12, LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 + 1) & LTP_MASK ], HarmShapeFIRPacked_Q12 ); 189 } else { 190 n_LTP_Q12 = 0; 191 } 192 193 n_Tilt_Q10 = silk_SMULWB( sLF_AR_shp_Q12, Tilt_Q14 ); 194 n_LF_Q10 = silk_SMLAWB( silk_SMULWT( sLF_AR_shp_Q12, LF_shp_Q14 ), sLF_MA_shp_Q12, LF_shp_Q14 ); 195 196 sLF_AR_shp_Q12 = silk_SUB32( st_res_Q12[ i ], silk_LSHIFT( n_Tilt_Q10, 2 ) ); 197 sLF_MA_shp_Q12 = silk_SUB32( sLF_AR_shp_Q12, silk_LSHIFT( n_LF_Q10, 2 ) ); 198 199 LTP_shp_buf_idx = ( LTP_shp_buf_idx - 1 ) & LTP_MASK; 200 LTP_shp_buf[ LTP_shp_buf_idx ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( sLF_MA_shp_Q12, 12 ) ); 201 202 xw_Q3[i] = silk_RSHIFT_ROUND( silk_SUB32( sLF_MA_shp_Q12, n_LTP_Q12 ), 9 ); 203 } 204 205 /* Copy temp variable back to state */ 206 P->sLF_AR_shp_Q12 = sLF_AR_shp_Q12; 207 P->sLF_MA_shp_Q12 = sLF_MA_shp_Q12; 208 P->sLTP_shp_buf_idx = LTP_shp_buf_idx; 209 } 210
