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
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11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
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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
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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
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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 #if defined(MIPSr1_ASM)
37 #include "mips/prefilter_FIX_mipsr1.h"
38 #endif
39
40
41 #if !defined(OVERRIDE_silk_warped_LPC_analysis_filter_FIX)
42 #define silk_warped_LPC_analysis_filter_FIX(state, res_Q2, coef_Q13, input, lambda_Q16, length, order, arch) \
43 ((void)(arch),silk_warped_LPC_analysis_filter_FIX_c(state, res_Q2, coef_Q13, input, lambda_Q16, length, order))
44 #endif
45
46 /* Prefilter for finding Quantizer input signal */
47 static OPUS_INLINE void silk_prefilt_FIX(
48 silk_prefilter_state_FIX *P, /* I/O state */
49 opus_int32 st_res_Q12[], /* I short term residual signal */
50 opus_int32 xw_Q3[], /* O prefiltered signal */
51 opus_int32 HarmShapeFIRPacked_Q12, /* I Harmonic shaping coeficients */
52 opus_int Tilt_Q14, /* I Tilt shaping coeficient */
53 opus_int32 LF_shp_Q14, /* I Low-frequancy shaping coeficients */
54 opus_int lag, /* I Lag for harmonic shaping */
55 opus_int length /* I Length of signals */
56 );
57
silk_warped_LPC_analysis_filter_FIX_c(opus_int32 state[],opus_int32 res_Q2[],const opus_int16 coef_Q13[],const opus_int16 input[],const opus_int16 lambda_Q16,const opus_int length,const opus_int order)58 void silk_warped_LPC_analysis_filter_FIX_c(
59 opus_int32 state[], /* I/O State [order + 1] */
60 opus_int32 res_Q2[], /* O Residual signal [length] */
61 const opus_int16 coef_Q13[], /* I Coefficients [order] */
62 const opus_int16 input[], /* I Input signal [length] */
63 const opus_int16 lambda_Q16, /* I Warping factor */
64 const opus_int length, /* I Length of input signal */
65 const opus_int order /* I Filter order (even) */
66 )
67 {
68 opus_int n, i;
69 opus_int32 acc_Q11, tmp1, tmp2;
70
71 /* Order must be even */
72 silk_assert( ( order & 1 ) == 0 );
73
74 for( n = 0; n < length; n++ ) {
75 /* Output of lowpass section */
76 tmp2 = silk_SMLAWB( state[ 0 ], state[ 1 ], lambda_Q16 );
77 state[ 0 ] = silk_LSHIFT( input[ n ], 14 );
78 /* Output of allpass section */
79 tmp1 = silk_SMLAWB( state[ 1 ], state[ 2 ] - tmp2, lambda_Q16 );
80 state[ 1 ] = tmp2;
81 acc_Q11 = silk_RSHIFT( order, 1 );
82 acc_Q11 = silk_SMLAWB( acc_Q11, tmp2, coef_Q13[ 0 ] );
83 /* Loop over allpass sections */
84 for( i = 2; i < order; i += 2 ) {
85 /* Output of allpass section */
86 tmp2 = silk_SMLAWB( state[ i ], state[ i + 1 ] - tmp1, lambda_Q16 );
87 state[ i ] = tmp1;
88 acc_Q11 = silk_SMLAWB( acc_Q11, tmp1, coef_Q13[ i - 1 ] );
89 /* Output of allpass section */
90 tmp1 = silk_SMLAWB( state[ i + 1 ], state[ i + 2 ] - tmp2, lambda_Q16 );
91 state[ i + 1 ] = tmp2;
92 acc_Q11 = silk_SMLAWB( acc_Q11, tmp2, coef_Q13[ i ] );
93 }
94 state[ order ] = tmp1;
95 acc_Q11 = silk_SMLAWB( acc_Q11, tmp1, coef_Q13[ order - 1 ] );
96 res_Q2[ n ] = silk_LSHIFT( (opus_int32)input[ n ], 2 ) - silk_RSHIFT_ROUND( acc_Q11, 9 );
97 }
98 }
99
silk_prefilter_FIX(silk_encoder_state_FIX * psEnc,const silk_encoder_control_FIX * psEncCtrl,opus_int32 xw_Q3[],const opus_int16 x[])100 void silk_prefilter_FIX(
101 silk_encoder_state_FIX *psEnc, /* I/O Encoder state */
102 const silk_encoder_control_FIX *psEncCtrl, /* I Encoder control */
103 opus_int32 xw_Q3[], /* O Weighted signal */
104 const opus_int16 x[] /* I Speech signal */
105 )
106 {
107 silk_prefilter_state_FIX *P = &psEnc->sPrefilt;
108 opus_int j, k, lag;
109 opus_int32 tmp_32;
110 const opus_int16 *AR1_shp_Q13;
111 const opus_int16 *px;
112 opus_int32 *pxw_Q3;
113 opus_int HarmShapeGain_Q12, Tilt_Q14;
114 opus_int32 HarmShapeFIRPacked_Q12, LF_shp_Q14;
115 VARDECL( opus_int32, x_filt_Q12 );
116 VARDECL( opus_int32, st_res_Q2 );
117 opus_int16 B_Q10[ 2 ];
118 SAVE_STACK;
119
120 /* Set up pointers */
121 px = x;
122 pxw_Q3 = xw_Q3;
123 lag = P->lagPrev;
124 ALLOC( x_filt_Q12, psEnc->sCmn.subfr_length, opus_int32 );
125 ALLOC( st_res_Q2, psEnc->sCmn.subfr_length, opus_int32 );
126 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
127 /* Update Variables that change per sub frame */
128 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
129 lag = psEncCtrl->pitchL[ k ];
130 }
131
132 /* Noise shape parameters */
133 HarmShapeGain_Q12 = silk_SMULWB( (opus_int32)psEncCtrl->HarmShapeGain_Q14[ k ], 16384 - psEncCtrl->HarmBoost_Q14[ k ] );
134 silk_assert( HarmShapeGain_Q12 >= 0 );
135 HarmShapeFIRPacked_Q12 = silk_RSHIFT( HarmShapeGain_Q12, 2 );
136 HarmShapeFIRPacked_Q12 |= silk_LSHIFT( (opus_int32)silk_RSHIFT( HarmShapeGain_Q12, 1 ), 16 );
137 Tilt_Q14 = psEncCtrl->Tilt_Q14[ k ];
138 LF_shp_Q14 = psEncCtrl->LF_shp_Q14[ k ];
139 AR1_shp_Q13 = &psEncCtrl->AR1_Q13[ k * MAX_SHAPE_LPC_ORDER ];
140
141 /* Short term FIR filtering*/
142 silk_warped_LPC_analysis_filter_FIX( P->sAR_shp, st_res_Q2, AR1_shp_Q13, px,
143 psEnc->sCmn.warping_Q16, psEnc->sCmn.subfr_length, psEnc->sCmn.shapingLPCOrder, psEnc->sCmn.arch );
144
145 /* Reduce (mainly) low frequencies during harmonic emphasis */
146 B_Q10[ 0 ] = silk_RSHIFT_ROUND( psEncCtrl->GainsPre_Q14[ k ], 4 );
147 tmp_32 = silk_SMLABB( SILK_FIX_CONST( INPUT_TILT, 26 ), psEncCtrl->HarmBoost_Q14[ k ], HarmShapeGain_Q12 ); /* Q26 */
148 tmp_32 = silk_SMLABB( tmp_32, psEncCtrl->coding_quality_Q14, SILK_FIX_CONST( HIGH_RATE_INPUT_TILT, 12 ) ); /* Q26 */
149 tmp_32 = silk_SMULWB( tmp_32, -psEncCtrl->GainsPre_Q14[ k ] ); /* Q24 */
150 tmp_32 = silk_RSHIFT_ROUND( tmp_32, 14 ); /* Q10 */
151 B_Q10[ 1 ]= silk_SAT16( tmp_32 );
152 x_filt_Q12[ 0 ] = silk_MLA( silk_MUL( st_res_Q2[ 0 ], B_Q10[ 0 ] ), P->sHarmHP_Q2, B_Q10[ 1 ] );
153 for( j = 1; j < psEnc->sCmn.subfr_length; j++ ) {
154 x_filt_Q12[ j ] = silk_MLA( silk_MUL( st_res_Q2[ j ], B_Q10[ 0 ] ), st_res_Q2[ j - 1 ], B_Q10[ 1 ] );
155 }
156 P->sHarmHP_Q2 = st_res_Q2[ psEnc->sCmn.subfr_length - 1 ];
157
158 silk_prefilt_FIX( P, x_filt_Q12, pxw_Q3, HarmShapeFIRPacked_Q12, Tilt_Q14, LF_shp_Q14, lag, psEnc->sCmn.subfr_length );
159
160 px += psEnc->sCmn.subfr_length;
161 pxw_Q3 += psEnc->sCmn.subfr_length;
162 }
163
164 P->lagPrev = psEncCtrl->pitchL[ psEnc->sCmn.nb_subfr - 1 ];
165 RESTORE_STACK;
166 }
167
168 #ifndef OVERRIDE_silk_prefilt_FIX
169 /* Prefilter for finding Quantizer input signal */
silk_prefilt_FIX(silk_prefilter_state_FIX * P,opus_int32 st_res_Q12[],opus_int32 xw_Q3[],opus_int32 HarmShapeFIRPacked_Q12,opus_int Tilt_Q14,opus_int32 LF_shp_Q14,opus_int lag,opus_int length)170 static OPUS_INLINE void silk_prefilt_FIX(
171 silk_prefilter_state_FIX *P, /* I/O state */
172 opus_int32 st_res_Q12[], /* I short term residual signal */
173 opus_int32 xw_Q3[], /* O prefiltered signal */
174 opus_int32 HarmShapeFIRPacked_Q12, /* I Harmonic shaping coeficients */
175 opus_int Tilt_Q14, /* I Tilt shaping coeficient */
176 opus_int32 LF_shp_Q14, /* I Low-frequancy shaping coeficients */
177 opus_int lag, /* I Lag for harmonic shaping */
178 opus_int length /* I Length of signals */
179 )
180 {
181 opus_int i, idx, LTP_shp_buf_idx;
182 opus_int32 n_LTP_Q12, n_Tilt_Q10, n_LF_Q10;
183 opus_int32 sLF_MA_shp_Q12, sLF_AR_shp_Q12;
184 opus_int16 *LTP_shp_buf;
185
186 /* To speed up use temp variables instead of using the struct */
187 LTP_shp_buf = P->sLTP_shp;
188 LTP_shp_buf_idx = P->sLTP_shp_buf_idx;
189 sLF_AR_shp_Q12 = P->sLF_AR_shp_Q12;
190 sLF_MA_shp_Q12 = P->sLF_MA_shp_Q12;
191
192 for( i = 0; i < length; i++ ) {
193 if( lag > 0 ) {
194 /* unrolled loop */
195 silk_assert( HARM_SHAPE_FIR_TAPS == 3 );
196 idx = lag + LTP_shp_buf_idx;
197 n_LTP_Q12 = silk_SMULBB( LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 - 1) & LTP_MASK ], HarmShapeFIRPacked_Q12 );
198 n_LTP_Q12 = silk_SMLABT( n_LTP_Q12, LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 ) & LTP_MASK ], HarmShapeFIRPacked_Q12 );
199 n_LTP_Q12 = silk_SMLABB( n_LTP_Q12, LTP_shp_buf[ ( idx - HARM_SHAPE_FIR_TAPS / 2 + 1) & LTP_MASK ], HarmShapeFIRPacked_Q12 );
200 } else {
201 n_LTP_Q12 = 0;
202 }
203
204 n_Tilt_Q10 = silk_SMULWB( sLF_AR_shp_Q12, Tilt_Q14 );
205 n_LF_Q10 = silk_SMLAWB( silk_SMULWT( sLF_AR_shp_Q12, LF_shp_Q14 ), sLF_MA_shp_Q12, LF_shp_Q14 );
206
207 sLF_AR_shp_Q12 = silk_SUB32( st_res_Q12[ i ], silk_LSHIFT( n_Tilt_Q10, 2 ) );
208 sLF_MA_shp_Q12 = silk_SUB32( sLF_AR_shp_Q12, silk_LSHIFT( n_LF_Q10, 2 ) );
209
210 LTP_shp_buf_idx = ( LTP_shp_buf_idx - 1 ) & LTP_MASK;
211 LTP_shp_buf[ LTP_shp_buf_idx ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( sLF_MA_shp_Q12, 12 ) );
212
213 xw_Q3[i] = silk_RSHIFT_ROUND( silk_SUB32( sLF_MA_shp_Q12, n_LTP_Q12 ), 9 );
214 }
215
216 /* Copy temp variable back to state */
217 P->sLF_AR_shp_Q12 = sLF_AR_shp_Q12;
218 P->sLF_MA_shp_Q12 = sLF_MA_shp_Q12;
219 P->sLTP_shp_buf_idx = LTP_shp_buf_idx;
220 }
221 #endif /* OVERRIDE_silk_prefilt_FIX */
222