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| 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.h" |
| 33 |
| 34 typedef struct { |
| 35 opus_int32 sLPC_Q14[ MAX_SUB_FRAME_LENGTH + NSQ_LPC_BUF_LENGTH ]; |
| 36 opus_int32 RandState[ DECISION_DELAY ]; |
| 37 opus_int32 Q_Q10[ DECISION_DELAY ]; |
| 38 opus_int32 Xq_Q14[ DECISION_DELAY ]; |
| 39 opus_int32 Pred_Q15[ DECISION_DELAY ]; |
| 40 opus_int32 Shape_Q14[ DECISION_DELAY ]; |
| 41 opus_int32 sAR2_Q14[ MAX_SHAPE_LPC_ORDER ]; |
| 42 opus_int32 LF_AR_Q14; |
| 43 opus_int32 Seed; |
| 44 opus_int32 SeedInit; |
| 45 opus_int32 RD_Q10; |
| 46 } NSQ_del_dec_struct; |
| 47 |
| 48 typedef struct { |
| 49 opus_int32 Q_Q10; |
| 50 opus_int32 RD_Q10; |
| 51 opus_int32 xq_Q14; |
| 52 opus_int32 LF_AR_Q14; |
| 53 opus_int32 sLTP_shp_Q14; |
| 54 opus_int32 LPC_exc_Q14; |
| 55 } NSQ_sample_struct; |
| 56 |
| 57 static inline void silk_nsq_del_dec_scale_states( |
| 58 const silk_encoder_state *psEncC, /* I Encoder State
*/ |
| 59 silk_nsq_state *NSQ, /* I/O NSQ state
*/ |
| 60 NSQ_del_dec_struct psDelDec[], /* I/O Delayed decision sta
tes */ |
| 61 const opus_int32 x_Q3[], /* I Input in Q3
*/ |
| 62 opus_int32 x_sc_Q10[], /* O Input scaled with 1/
Gain in Q10 */ |
| 63 const opus_int16 sLTP[], /* I Re-whitened LTP stat
e in Q0 */ |
| 64 opus_int32 sLTP_Q15[], /* O LTP state matching s
caled input */ |
| 65 opus_int subfr, /* I Subframe number
*/ |
| 66 opus_int nStatesDelayedDecision, /* I Number of del dec st
ates */ |
| 67 const opus_int LTP_scale_Q14, /* I LTP state scaling
*/ |
| 68 const opus_int32 Gains_Q16[ MAX_NB_SUBFR ], /* I
*/ |
| 69 const opus_int pitchL[ MAX_NB_SUBFR ], /* I Pitch lag
*/ |
| 70 const opus_int signal_type, /* I Signal type
*/ |
| 71 const opus_int decisionDelay /* I Decision delay
*/ |
| 72 ); |
| 73 |
| 74 /******************************************/ |
| 75 /* Noise shape quantizer for one subframe */ |
| 76 /******************************************/ |
| 77 static inline void silk_noise_shape_quantizer_del_dec( |
| 78 silk_nsq_state *NSQ, /* I/O NSQ state
*/ |
| 79 NSQ_del_dec_struct psDelDec[], /* I/O Delayed decision states
*/ |
| 80 opus_int signalType, /* I Signal type
*/ |
| 81 const opus_int32 x_Q10[], /* I
*/ |
| 82 opus_int8 pulses[], /* O
*/ |
| 83 opus_int16 xq[], /* O
*/ |
| 84 opus_int32 sLTP_Q15[], /* I/O LTP filter state
*/ |
| 85 opus_int32 delayedGain_Q10[], /* I/O Gain delay buffer
*/ |
| 86 const opus_int16 a_Q12[], /* I Short term prediction co
efs */ |
| 87 const opus_int16 b_Q14[], /* I Long term prediction coe
fs */ |
| 88 const opus_int16 AR_shp_Q13[], /* I Noise shaping coefs
*/ |
| 89 opus_int lag, /* I Pitch lag
*/ |
| 90 opus_int32 HarmShapeFIRPacked_Q14, /* I
*/ |
| 91 opus_int Tilt_Q14, /* I Spectral tilt
*/ |
| 92 opus_int32 LF_shp_Q14, /* I
*/ |
| 93 opus_int32 Gain_Q16, /* I
*/ |
| 94 opus_int Lambda_Q10, /* I
*/ |
| 95 opus_int offset_Q10, /* I
*/ |
| 96 opus_int length, /* I Input length
*/ |
| 97 opus_int subfr, /* I Subframe number
*/ |
| 98 opus_int shapingLPCOrder, /* I Shaping LPC filter order
*/ |
| 99 opus_int predictLPCOrder, /* I Prediction filter order
*/ |
| 100 opus_int warping_Q16, /* I
*/ |
| 101 opus_int nStatesDelayedDecision, /* I Number of states in deci
sion tree */ |
| 102 opus_int *smpl_buf_idx, /* I Index to newest samples
in buffers */ |
| 103 opus_int decisionDelay /* I
*/ |
| 104 ); |
| 105 |
| 106 void silk_NSQ_del_dec( |
| 107 const silk_encoder_state *psEncC, /* I
/O Encoder State */ |
| 108 silk_nsq_state *NSQ, /* I
/O NSQ state */ |
| 109 SideInfoIndices *psIndices, /* I
/O Quantization Indices */ |
| 110 const opus_int32 x_Q3[], /* I
Prefiltered input signal */ |
| 111 opus_int8 pulses[], /* O
Quantized pulse signal */ |
| 112 const opus_int16 PredCoef_Q12[ 2 * MAX_LPC_ORDER ], /* I
Short term prediction coefs */ |
| 113 const opus_int16 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ], /* I
Long term prediction coefs */ |
| 114 const opus_int16 AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /
* I Noise shaping coefs */ |
| 115 const opus_int HarmShapeGain_Q14[ MAX_NB_SUBFR ], /* I
Long term shaping coefs */ |
| 116 const opus_int Tilt_Q14[ MAX_NB_SUBFR ], /* I
Spectral tilt */ |
| 117 const opus_int32 LF_shp_Q14[ MAX_NB_SUBFR ], /* I
Low frequency shaping coefs */ |
| 118 const opus_int32 Gains_Q16[ MAX_NB_SUBFR ], /* I
Quantization step sizes */ |
| 119 const opus_int pitchL[ MAX_NB_SUBFR ], /* I
Pitch lags */ |
| 120 const opus_int Lambda_Q10, /* I
Rate/distortion tradeoff */ |
| 121 const opus_int LTP_scale_Q14 /* I
LTP state scaling */ |
| 122 ) |
| 123 { |
| 124 opus_int i, k, lag, start_idx, LSF_interpolation_flag, Winner_ind
, subfr; |
| 125 opus_int last_smple_idx, smpl_buf_idx, decisionDelay; |
| 126 const opus_int16 *A_Q12, *B_Q14, *AR_shp_Q13; |
| 127 opus_int16 *pxq; |
| 128 opus_int32 sLTP_Q15[ 2 * MAX_FRAME_LENGTH ]; |
| 129 opus_int16 sLTP[ 2 * MAX_FRAME_LENGTH ]; |
| 130 opus_int32 HarmShapeFIRPacked_Q14; |
| 131 opus_int offset_Q10; |
| 132 opus_int32 RDmin_Q10, Gain_Q10; |
| 133 opus_int32 x_sc_Q10[ MAX_SUB_FRAME_LENGTH ]; |
| 134 opus_int32 delayedGain_Q10[ DECISION_DELAY ]; |
| 135 NSQ_del_dec_struct psDelDec[ MAX_DEL_DEC_STATES ]; |
| 136 NSQ_del_dec_struct *psDD; |
| 137 |
| 138 /* Set unvoiced lag to the previous one, overwrite later for voiced */ |
| 139 lag = NSQ->lagPrev; |
| 140 |
| 141 silk_assert( NSQ->prev_gain_Q16 != 0 ); |
| 142 |
| 143 /* Initialize delayed decision states */ |
| 144 silk_memset( psDelDec, 0, psEncC->nStatesDelayedDecision * sizeof( NSQ_del_d
ec_struct ) ); |
| 145 for( k = 0; k < psEncC->nStatesDelayedDecision; k++ ) { |
| 146 psDD = &psDelDec[ k ]; |
| 147 psDD->Seed = ( k + psIndices->Seed ) & 3; |
| 148 psDD->SeedInit = psDD->Seed; |
| 149 psDD->RD_Q10 = 0; |
| 150 psDD->LF_AR_Q14 = NSQ->sLF_AR_shp_Q14; |
| 151 psDD->Shape_Q14[ 0 ] = NSQ->sLTP_shp_Q14[ psEncC->ltp_mem_length - 1 ]; |
| 152 silk_memcpy( psDD->sLPC_Q14, NSQ->sLPC_Q14, NSQ_LPC_BUF_LENGTH * sizeof(
opus_int32 ) ); |
| 153 silk_memcpy( psDD->sAR2_Q14, NSQ->sAR2_Q14, sizeof( NSQ->sAR2_Q14 ) ); |
| 154 } |
| 155 |
| 156 offset_Q10 = silk_Quantization_Offsets_Q10[ psIndices->signalType >> 1 ][
psIndices->quantOffsetType ]; |
| 157 smpl_buf_idx = 0; /* index of oldest samples */ |
| 158 |
| 159 decisionDelay = silk_min_int( DECISION_DELAY, psEncC->subfr_length ); |
| 160 |
| 161 /* For voiced frames limit the decision delay to lower than the pitch lag */ |
| 162 if( psIndices->signalType == TYPE_VOICED ) { |
| 163 for( k = 0; k < psEncC->nb_subfr; k++ ) { |
| 164 decisionDelay = silk_min_int( decisionDelay, pitchL[ k ] - LTP_ORDER
/ 2 - 1 ); |
| 165 } |
| 166 } else { |
| 167 if( lag > 0 ) { |
| 168 decisionDelay = silk_min_int( decisionDelay, lag - LTP_ORDER / 2 - 1
); |
| 169 } |
| 170 } |
| 171 |
| 172 if( psIndices->NLSFInterpCoef_Q2 == 4 ) { |
| 173 LSF_interpolation_flag = 0; |
| 174 } else { |
| 175 LSF_interpolation_flag = 1; |
| 176 } |
| 177 |
| 178 /* Set up pointers to start of sub frame */ |
| 179 pxq = &NSQ->xq[ psEncC->ltp_mem_length ]; |
| 180 NSQ->sLTP_shp_buf_idx = psEncC->ltp_mem_length; |
| 181 NSQ->sLTP_buf_idx = psEncC->ltp_mem_length; |
| 182 subfr = 0; |
| 183 for( k = 0; k < psEncC->nb_subfr; k++ ) { |
| 184 A_Q12 = &PredCoef_Q12[ ( ( k >> 1 ) | ( 1 - LSF_interpolation_flag
) ) * MAX_LPC_ORDER ]; |
| 185 B_Q14 = <PCoef_Q14[ k * LTP_ORDER ]; |
| 186 AR_shp_Q13 = &AR2_Q13[ k * MAX_SHAPE_LPC_ORDER ]; |
| 187 |
| 188 /* Noise shape parameters */ |
| 189 silk_assert( HarmShapeGain_Q14[ k ] >= 0 ); |
| 190 HarmShapeFIRPacked_Q14 = silk_RSHIFT( HarmShap
eGain_Q14[ k ], 2 ); |
| 191 HarmShapeFIRPacked_Q14 |= silk_LSHIFT( (opus_int32)silk_RSHIFT( HarmShap
eGain_Q14[ k ], 1 ), 16 ); |
| 192 |
| 193 NSQ->rewhite_flag = 0; |
| 194 if( psIndices->signalType == TYPE_VOICED ) { |
| 195 /* Voiced */ |
| 196 lag = pitchL[ k ]; |
| 197 |
| 198 /* Re-whitening */ |
| 199 if( ( k & ( 3 - silk_LSHIFT( LSF_interpolation_flag, 1 ) ) ) == 0 )
{ |
| 200 if( k == 2 ) { |
| 201 /* RESET DELAYED DECISIONS */ |
| 202 /* Find winner */ |
| 203 RDmin_Q10 = psDelDec[ 0 ].RD_Q10; |
| 204 Winner_ind = 0; |
| 205 for( i = 1; i < psEncC->nStatesDelayedDecision; i++ ) { |
| 206 if( psDelDec[ i ].RD_Q10 < RDmin_Q10 ) { |
| 207 RDmin_Q10 = psDelDec[ i ].RD_Q10; |
| 208 Winner_ind = i; |
| 209 } |
| 210 } |
| 211 for( i = 0; i < psEncC->nStatesDelayedDecision; i++ ) { |
| 212 if( i != Winner_ind ) { |
| 213 psDelDec[ i ].RD_Q10 += ( silk_int32_MAX >> 4 ); |
| 214 silk_assert( psDelDec[ i ].RD_Q10 >= 0 ); |
| 215 } |
| 216 } |
| 217 |
| 218 /* Copy final part of signals from winner state to output an
d long-term filter states */ |
| 219 psDD = &psDelDec[ Winner_ind ]; |
| 220 last_smple_idx = smpl_buf_idx + decisionDelay; |
| 221 for( i = 0; i < decisionDelay; i++ ) { |
| 222 last_smple_idx = ( last_smple_idx - 1 ) & DECISION_DELAY
_MASK; |
| 223 pulses[ i - decisionDelay ] = (opus_int8)silk_RSHIFT_R
OUND( psDD->Q_Q10[ last_smple_idx ], 10 ); |
| 224 pxq[ i - decisionDelay ] = (opus_int16)silk_SAT16( silk_
RSHIFT_ROUND( |
| 225 silk_SMULWW( psDD->Xq_Q14[ last_smple_idx ], Gains_Q
16[ 1 ] ), 14 ) ); |
| 226 NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - decisionDelay
+ i ] = psDD->Shape_Q14[ last_smple_idx ]; |
| 227 } |
| 228 |
| 229 subfr = 0; |
| 230 } |
| 231 |
| 232 /* Rewhiten with new A coefs */ |
| 233 start_idx = psEncC->ltp_mem_length - lag - psEncC->predictLPCOrd
er - LTP_ORDER / 2; |
| 234 silk_assert( start_idx > 0 ); |
| 235 |
| 236 silk_LPC_analysis_filter( &sLTP[ start_idx ], &NSQ->xq[ start_id
x + k * psEncC->subfr_length ], |
| 237 A_Q12, psEncC->ltp_mem_length - start_idx, psEncC->predictLP
COrder ); |
| 238 |
| 239 NSQ->sLTP_buf_idx = psEncC->ltp_mem_length; |
| 240 NSQ->rewhite_flag = 1; |
| 241 } |
| 242 } |
| 243 |
| 244 silk_nsq_del_dec_scale_states( psEncC, NSQ, psDelDec, x_Q3, x_sc_Q10, sL
TP, sLTP_Q15, k, |
| 245 psEncC->nStatesDelayedDecision, LTP_scale_Q14, Gains_Q16, pitchL, ps
Indices->signalType, decisionDelay ); |
| 246 |
| 247 silk_noise_shape_quantizer_del_dec( NSQ, psDelDec, psIndices->signalType
, x_sc_Q10, pulses, pxq, sLTP_Q15, |
| 248 delayedGain_Q10, A_Q12, B_Q14, AR_shp_Q13, lag, HarmShapeFIRPacked_Q
14, Tilt_Q14[ k ], LF_shp_Q14[ k ], |
| 249 Gains_Q16[ k ], Lambda_Q10, offset_Q10, psEncC->subfr_length, subfr+
+, psEncC->shapingLPCOrder, |
| 250 psEncC->predictLPCOrder, psEncC->warping_Q16, psEncC->nStatesDelayed
Decision, &smpl_buf_idx, decisionDelay ); |
| 251 |
| 252 x_Q3 += psEncC->subfr_length; |
| 253 pulses += psEncC->subfr_length; |
| 254 pxq += psEncC->subfr_length; |
| 255 } |
| 256 |
| 257 /* Find winner */ |
| 258 RDmin_Q10 = psDelDec[ 0 ].RD_Q10; |
| 259 Winner_ind = 0; |
| 260 for( k = 1; k < psEncC->nStatesDelayedDecision; k++ ) { |
| 261 if( psDelDec[ k ].RD_Q10 < RDmin_Q10 ) { |
| 262 RDmin_Q10 = psDelDec[ k ].RD_Q10; |
| 263 Winner_ind = k; |
| 264 } |
| 265 } |
| 266 |
| 267 /* Copy final part of signals from winner state to output and long-term filt
er states */ |
| 268 psDD = &psDelDec[ Winner_ind ]; |
| 269 psIndices->Seed = psDD->SeedInit; |
| 270 last_smple_idx = smpl_buf_idx + decisionDelay; |
| 271 Gain_Q10 = silk_RSHIFT32( Gains_Q16[ psEncC->nb_subfr - 1 ], 6 ); |
| 272 for( i = 0; i < decisionDelay; i++ ) { |
| 273 last_smple_idx = ( last_smple_idx - 1 ) & DECISION_DELAY_MASK; |
| 274 pulses[ i - decisionDelay ] = (opus_int8)silk_RSHIFT_ROUND( psDD->Q_Q1
0[ last_smple_idx ], 10 ); |
| 275 pxq[ i - decisionDelay ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( |
| 276 silk_SMULWW( psDD->Xq_Q14[ last_smple_idx ], Gain_Q10 ), 8 ) ); |
| 277 NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - decisionDelay + i ] = psDD->S
hape_Q14[ last_smple_idx ]; |
| 278 } |
| 279 silk_memcpy( NSQ->sLPC_Q14, &psDD->sLPC_Q14[ psEncC->subfr_length ], NSQ_LPC
_BUF_LENGTH * sizeof( opus_int32 ) ); |
| 280 silk_memcpy( NSQ->sAR2_Q14, psDD->sAR2_Q14, sizeof( psDD->sAR2_Q14 ) ); |
| 281 |
| 282 /* Update states */ |
| 283 NSQ->sLF_AR_shp_Q14 = psDD->LF_AR_Q14; |
| 284 NSQ->lagPrev = pitchL[ psEncC->nb_subfr - 1 ]; |
| 285 |
| 286 /* Save quantized speech signal */ |
| 287 /* DEBUG_STORE_DATA( enc.pcm, &NSQ->xq[psEncC->ltp_mem_length], psEncC->fram
e_length * sizeof( opus_int16 ) ) */ |
| 288 silk_memmove( NSQ->xq, &NSQ->xq[ psEncC->frame_length ],
psEncC->ltp_mem_length * sizeof( opus_int16 ) ); |
| 289 silk_memmove( NSQ->sLTP_shp_Q14, &NSQ->sLTP_shp_Q14[ psEncC->frame_length ],
psEncC->ltp_mem_length * sizeof( opus_int32 ) ); |
| 290 } |
| 291 |
| 292 /******************************************/ |
| 293 /* Noise shape quantizer for one subframe */ |
| 294 /******************************************/ |
| 295 static inline void silk_noise_shape_quantizer_del_dec( |
| 296 silk_nsq_state *NSQ, /* I/O NSQ state
*/ |
| 297 NSQ_del_dec_struct psDelDec[], /* I/O Delayed decision states
*/ |
| 298 opus_int signalType, /* I Signal type
*/ |
| 299 const opus_int32 x_Q10[], /* I
*/ |
| 300 opus_int8 pulses[], /* O
*/ |
| 301 opus_int16 xq[], /* O
*/ |
| 302 opus_int32 sLTP_Q15[], /* I/O LTP filter state
*/ |
| 303 opus_int32 delayedGain_Q10[], /* I/O Gain delay buffer
*/ |
| 304 const opus_int16 a_Q12[], /* I Short term prediction co
efs */ |
| 305 const opus_int16 b_Q14[], /* I Long term prediction coe
fs */ |
| 306 const opus_int16 AR_shp_Q13[], /* I Noise shaping coefs
*/ |
| 307 opus_int lag, /* I Pitch lag
*/ |
| 308 opus_int32 HarmShapeFIRPacked_Q14, /* I
*/ |
| 309 opus_int Tilt_Q14, /* I Spectral tilt
*/ |
| 310 opus_int32 LF_shp_Q14, /* I
*/ |
| 311 opus_int32 Gain_Q16, /* I
*/ |
| 312 opus_int Lambda_Q10, /* I
*/ |
| 313 opus_int offset_Q10, /* I
*/ |
| 314 opus_int length, /* I Input length
*/ |
| 315 opus_int subfr, /* I Subframe number
*/ |
| 316 opus_int shapingLPCOrder, /* I Shaping LPC filter order
*/ |
| 317 opus_int predictLPCOrder, /* I Prediction filter order
*/ |
| 318 opus_int warping_Q16, /* I
*/ |
| 319 opus_int nStatesDelayedDecision, /* I Number of states in deci
sion tree */ |
| 320 opus_int *smpl_buf_idx, /* I Index to newest samples
in buffers */ |
| 321 opus_int decisionDelay /* I
*/ |
| 322 ) |
| 323 { |
| 324 opus_int i, j, k, Winner_ind, RDmin_ind, RDmax_ind, last_smple_idx; |
| 325 opus_int32 Winner_rand_state; |
| 326 opus_int32 LTP_pred_Q14, LPC_pred_Q14, n_AR_Q14, n_LTP_Q14; |
| 327 opus_int32 n_LF_Q14, r_Q10, rr_Q10, rd1_Q10, rd2_Q10, RDmin_Q10, RDmax_Q10
; |
| 328 opus_int32 q1_Q0, q1_Q10, q2_Q10, exc_Q14, LPC_exc_Q14, xq_Q14, Gain_Q10; |
| 329 opus_int32 tmp1, tmp2, sLF_AR_shp_Q14; |
| 330 opus_int32 *pred_lag_ptr, *shp_lag_ptr, *psLPC_Q14; |
| 331 NSQ_sample_struct psSampleState[ MAX_DEL_DEC_STATES ][ 2 ]; |
| 332 NSQ_del_dec_struct *psDD; |
| 333 NSQ_sample_struct *psSS; |
| 334 |
| 335 silk_assert( nStatesDelayedDecision > 0 ); |
| 336 |
| 337 shp_lag_ptr = &NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - lag + HARM_SHAPE_
FIR_TAPS / 2 ]; |
| 338 pred_lag_ptr = &sLTP_Q15[ NSQ->sLTP_buf_idx - lag + LTP_ORDER / 2 ]; |
| 339 Gain_Q10 = silk_RSHIFT( Gain_Q16, 6 ); |
| 340 |
| 341 for( i = 0; i < length; i++ ) { |
| 342 /* Perform common calculations used in all states */ |
| 343 |
| 344 /* Long-term prediction */ |
| 345 if( signalType == TYPE_VOICED ) { |
| 346 /* Unrolled loop */ |
| 347 /* Avoids introducing a bias because silk_SMLAWB() always rounds to
-inf */ |
| 348 LTP_pred_Q14 = 2; |
| 349 LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ 0 ], b_Q14[
0 ] ); |
| 350 LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -1 ], b_Q14[
1 ] ); |
| 351 LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -2 ], b_Q14[
2 ] ); |
| 352 LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -3 ], b_Q14[
3 ] ); |
| 353 LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -4 ], b_Q14[
4 ] ); |
| 354 LTP_pred_Q14 = silk_LSHIFT( LTP_pred_Q14, 1 );
/* Q13 -> Q14 */ |
| 355 pred_lag_ptr++; |
| 356 } else { |
| 357 LTP_pred_Q14 = 0; |
| 358 } |
| 359 |
| 360 /* Long-term shaping */ |
| 361 if( lag > 0 ) { |
| 362 /* Symmetric, packed FIR coefficients */ |
| 363 n_LTP_Q14 = silk_SMULWB( silk_ADD32( shp_lag_ptr[ 0 ], shp_lag_ptr[
-2 ] ), HarmShapeFIRPacked_Q14 ); |
| 364 n_LTP_Q14 = silk_SMLAWT( n_LTP_Q14, shp_lag_ptr[ -1 ],
HarmShapeFIRPacked_Q14 ); |
| 365 n_LTP_Q14 = silk_SUB_LSHIFT32( LTP_pred_Q14, n_LTP_Q14, 2 );
/* Q12 -> Q14 */ |
| 366 shp_lag_ptr++; |
| 367 } else { |
| 368 n_LTP_Q14 = 0; |
| 369 } |
| 370 |
| 371 for( k = 0; k < nStatesDelayedDecision; k++ ) { |
| 372 /* Delayed decision state */ |
| 373 psDD = &psDelDec[ k ]; |
| 374 |
| 375 /* Sample state */ |
| 376 psSS = psSampleState[ k ]; |
| 377 |
| 378 /* Generate dither */ |
| 379 psDD->Seed = silk_RAND( psDD->Seed ); |
| 380 |
| 381 /* Pointer used in short term prediction and shaping */ |
| 382 psLPC_Q14 = &psDD->sLPC_Q14[ NSQ_LPC_BUF_LENGTH - 1 + i ]; |
| 383 /* Short-term prediction */ |
| 384 silk_assert( predictLPCOrder == 10 || predictLPCOrder == 16 ); |
| 385 /* Avoids introducing a bias because silk_SMLAWB() always rounds to
-inf */ |
| 386 LPC_pred_Q14 = silk_RSHIFT( predictLPCOrder, 1 ); |
| 387 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ 0 ], a_Q12[ 0
] ); |
| 388 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -1 ], a_Q12[ 1
] ); |
| 389 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -2 ], a_Q12[ 2
] ); |
| 390 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -3 ], a_Q12[ 3
] ); |
| 391 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -4 ], a_Q12[ 4
] ); |
| 392 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -5 ], a_Q12[ 5
] ); |
| 393 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -6 ], a_Q12[ 6
] ); |
| 394 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -7 ], a_Q12[ 7
] ); |
| 395 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -8 ], a_Q12[ 8
] ); |
| 396 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -9 ], a_Q12[ 9
] ); |
| 397 if( predictLPCOrder == 16 ) { |
| 398 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -10 ], a_Q1
2[ 10 ] ); |
| 399 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -11 ], a_Q1
2[ 11 ] ); |
| 400 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -12 ], a_Q1
2[ 12 ] ); |
| 401 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -13 ], a_Q1
2[ 13 ] ); |
| 402 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -14 ], a_Q1
2[ 14 ] ); |
| 403 LPC_pred_Q14 = silk_SMLAWB( LPC_pred_Q14, psLPC_Q14[ -15 ], a_Q1
2[ 15 ] ); |
| 404 } |
| 405 LPC_pred_Q14 = silk_LSHIFT( LPC_pred_Q14, 4 );
/* Q10 -> Q14 */ |
| 406 |
| 407 /* Noise shape feedback */ |
| 408 silk_assert( ( shapingLPCOrder & 1 ) == 0 ); /* check that order i
s even */ |
| 409 /* Output of lowpass section */ |
| 410 tmp2 = silk_SMLAWB( psLPC_Q14[ 0 ], psDD->sAR2_Q14[ 0 ], warping_Q16
); |
| 411 /* Output of allpass section */ |
| 412 tmp1 = silk_SMLAWB( psDD->sAR2_Q14[ 0 ], psDD->sAR2_Q14[ 1 ] - tmp2,
warping_Q16 ); |
| 413 psDD->sAR2_Q14[ 0 ] = tmp2; |
| 414 n_AR_Q14 = silk_RSHIFT( shapingLPCOrder, 1 ); |
| 415 n_AR_Q14 = silk_SMLAWB( n_AR_Q14, tmp2, AR_shp_Q13[ 0 ] ); |
| 416 /* Loop over allpass sections */ |
| 417 for( j = 2; j < shapingLPCOrder; j += 2 ) { |
| 418 /* Output of allpass section */ |
| 419 tmp2 = silk_SMLAWB( psDD->sAR2_Q14[ j - 1 ], psDD->sAR2_Q14[ j +
0 ] - tmp1, warping_Q16 ); |
| 420 psDD->sAR2_Q14[ j - 1 ] = tmp1; |
| 421 n_AR_Q14 = silk_SMLAWB( n_AR_Q14, tmp1, AR_shp_Q13[ j - 1 ] ); |
| 422 /* Output of allpass section */ |
| 423 tmp1 = silk_SMLAWB( psDD->sAR2_Q14[ j + 0 ], psDD->sAR2_Q14[ j +
1 ] - tmp2, warping_Q16 ); |
| 424 psDD->sAR2_Q14[ j + 0 ] = tmp2; |
| 425 n_AR_Q14 = silk_SMLAWB( n_AR_Q14, tmp2, AR_shp_Q13[ j ] ); |
| 426 } |
| 427 psDD->sAR2_Q14[ shapingLPCOrder - 1 ] = tmp1; |
| 428 n_AR_Q14 = silk_SMLAWB( n_AR_Q14, tmp1, AR_shp_Q13[ shapingLPCOrder
- 1 ] ); |
| 429 |
| 430 n_AR_Q14 = silk_LSHIFT( n_AR_Q14, 1 );
/* Q11 -> Q12 */ |
| 431 n_AR_Q14 = silk_SMLAWB( n_AR_Q14, psDD->LF_AR_Q14, Tilt_Q14 );
/* Q12 */ |
| 432 n_AR_Q14 = silk_LSHIFT( n_AR_Q14, 2 );
/* Q12 -> Q14 */ |
| 433 |
| 434 n_LF_Q14 = silk_SMULWB( psDD->Shape_Q14[ *smpl_buf_idx ], LF_shp_Q14
); /* Q12 */ |
| 435 n_LF_Q14 = silk_SMLAWT( n_LF_Q14, psDD->LF_AR_Q14, LF_shp_Q14 );
/* Q12 */ |
| 436 n_LF_Q14 = silk_LSHIFT( n_LF_Q14, 2 );
/* Q12 -> Q14 */ |
| 437 |
| 438 /* Input minus prediction plus noise feedback
*/ |
| 439 /* r = x[ i ] - LTP_pred - LPC_pred + n_AR + n_Tilt + n_LF + n_LTP
*/ |
| 440 tmp1 = silk_ADD32( n_AR_Q14, n_LF_Q14 );
/* Q14 */ |
| 441 tmp2 = silk_ADD32( n_LTP_Q14, LPC_pred_Q14 );
/* Q13 */ |
| 442 tmp1 = silk_SUB32( tmp2, tmp1 );
/* Q13 */ |
| 443 tmp1 = silk_RSHIFT_ROUND( tmp1, 4 );
/* Q10 */ |
| 444 |
| 445 r_Q10 = silk_SUB32( x_Q10[ i ], tmp1 );
/* residual error Q10 */ |
| 446 |
| 447 /* Flip sign depending on dither */ |
| 448 if ( psDD->Seed < 0 ) { |
| 449 r_Q10 = -r_Q10; |
| 450 } |
| 451 r_Q10 = silk_LIMIT_32( r_Q10, -(31 << 10), 30 << 10 ); |
| 452 |
| 453 /* Find two quantization level candidates and measure their rate-dis
tortion */ |
| 454 q1_Q10 = silk_SUB32( r_Q10, offset_Q10 ); |
| 455 q1_Q0 = silk_RSHIFT( q1_Q10, 10 ); |
| 456 if( q1_Q0 > 0 ) { |
| 457 q1_Q10 = silk_SUB32( silk_LSHIFT( q1_Q0, 10 ), QUANT_LEVEL_ADJU
ST_Q10 ); |
| 458 q1_Q10 = silk_ADD32( q1_Q10, offset_Q10 ); |
| 459 q2_Q10 = silk_ADD32( q1_Q10, 1024 ); |
| 460 rd1_Q10 = silk_SMULBB( q1_Q10, Lambda_Q10 ); |
| 461 rd2_Q10 = silk_SMULBB( q2_Q10, Lambda_Q10 ); |
| 462 } else if( q1_Q0 == 0 ) { |
| 463 q1_Q10 = offset_Q10; |
| 464 q2_Q10 = silk_ADD32( q1_Q10, 1024 - QUANT_LEVEL_ADJUST_Q10 ); |
| 465 rd1_Q10 = silk_SMULBB( q1_Q10, Lambda_Q10 ); |
| 466 rd2_Q10 = silk_SMULBB( q2_Q10, Lambda_Q10 ); |
| 467 } else if( q1_Q0 == -1 ) { |
| 468 q2_Q10 = offset_Q10; |
| 469 q1_Q10 = silk_SUB32( q2_Q10, 1024 - QUANT_LEVEL_ADJUST_Q10 ); |
| 470 rd1_Q10 = silk_SMULBB( -q1_Q10, Lambda_Q10 ); |
| 471 rd2_Q10 = silk_SMULBB( q2_Q10, Lambda_Q10 ); |
| 472 } else { /* q1_Q0 < -1 */ |
| 473 q1_Q10 = silk_ADD32( silk_LSHIFT( q1_Q0, 10 ), QUANT_LEVEL_ADJU
ST_Q10 ); |
| 474 q1_Q10 = silk_ADD32( q1_Q10, offset_Q10 ); |
| 475 q2_Q10 = silk_ADD32( q1_Q10, 1024 ); |
| 476 rd1_Q10 = silk_SMULBB( -q1_Q10, Lambda_Q10 ); |
| 477 rd2_Q10 = silk_SMULBB( -q2_Q10, Lambda_Q10 ); |
| 478 } |
| 479 rr_Q10 = silk_SUB32( r_Q10, q1_Q10 ); |
| 480 rd1_Q10 = silk_RSHIFT( silk_SMLABB( rd1_Q10, rr_Q10, rr_Q10 ), 10 ); |
| 481 rr_Q10 = silk_SUB32( r_Q10, q2_Q10 ); |
| 482 rd2_Q10 = silk_RSHIFT( silk_SMLABB( rd2_Q10, rr_Q10, rr_Q10 ), 10 ); |
| 483 |
| 484 if( rd1_Q10 < rd2_Q10 ) { |
| 485 psSS[ 0 ].RD_Q10 = silk_ADD32( psDD->RD_Q10, rd1_Q10 ); |
| 486 psSS[ 1 ].RD_Q10 = silk_ADD32( psDD->RD_Q10, rd2_Q10 ); |
| 487 psSS[ 0 ].Q_Q10 = q1_Q10; |
| 488 psSS[ 1 ].Q_Q10 = q2_Q10; |
| 489 } else { |
| 490 psSS[ 0 ].RD_Q10 = silk_ADD32( psDD->RD_Q10, rd2_Q10 ); |
| 491 psSS[ 1 ].RD_Q10 = silk_ADD32( psDD->RD_Q10, rd1_Q10 ); |
| 492 psSS[ 0 ].Q_Q10 = q2_Q10; |
| 493 psSS[ 1 ].Q_Q10 = q1_Q10; |
| 494 } |
| 495 |
| 496 /* Update states for best quantization */ |
| 497 |
| 498 /* Quantized excitation */ |
| 499 exc_Q14 = silk_LSHIFT32( psSS[ 0 ].Q_Q10, 4 ); |
| 500 if ( psDD->Seed < 0 ) { |
| 501 exc_Q14 = -exc_Q14; |
| 502 } |
| 503 |
| 504 /* Add predictions */ |
| 505 LPC_exc_Q14 = silk_ADD32( exc_Q14, LTP_pred_Q14 ); |
| 506 xq_Q14 = silk_ADD32( LPC_exc_Q14, LPC_pred_Q14 ); |
| 507 |
| 508 /* Update states */ |
| 509 sLF_AR_shp_Q14 = silk_SUB32( xq_Q14, n_AR_Q14 ); |
| 510 psSS[ 0 ].sLTP_shp_Q14 = silk_SUB32( sLF_AR_shp_Q14, n_LF_Q14 ); |
| 511 psSS[ 0 ].LF_AR_Q14 = sLF_AR_shp_Q14; |
| 512 psSS[ 0 ].LPC_exc_Q14 = LPC_exc_Q14; |
| 513 psSS[ 0 ].xq_Q14 = xq_Q14; |
| 514 |
| 515 /* Update states for second best quantization */ |
| 516 |
| 517 /* Quantized excitation */ |
| 518 exc_Q14 = silk_LSHIFT32( psSS[ 1 ].Q_Q10, 4 ); |
| 519 if ( psDD->Seed < 0 ) { |
| 520 exc_Q14 = -exc_Q14; |
| 521 } |
| 522 |
| 523 |
| 524 /* Add predictions */ |
| 525 LPC_exc_Q14 = silk_ADD32( exc_Q14, LTP_pred_Q14 ); |
| 526 xq_Q14 = silk_ADD32( LPC_exc_Q14, LPC_pred_Q14 ); |
| 527 |
| 528 /* Update states */ |
| 529 sLF_AR_shp_Q14 = silk_SUB32( xq_Q14, n_AR_Q14 ); |
| 530 psSS[ 1 ].sLTP_shp_Q14 = silk_SUB32( sLF_AR_shp_Q14, n_LF_Q14 ); |
| 531 psSS[ 1 ].LF_AR_Q14 = sLF_AR_shp_Q14; |
| 532 psSS[ 1 ].LPC_exc_Q14 = LPC_exc_Q14; |
| 533 psSS[ 1 ].xq_Q14 = xq_Q14; |
| 534 } |
| 535 |
| 536 *smpl_buf_idx = ( *smpl_buf_idx - 1 ) & DECISION_DELAY_MASK;
/* Index to newest samples */ |
| 537 last_smple_idx = ( *smpl_buf_idx + decisionDelay ) & DECISION_DELAY_MASK
; /* Index to decisionDelay old samples */ |
| 538 |
| 539 /* Find winner */ |
| 540 RDmin_Q10 = psSampleState[ 0 ][ 0 ].RD_Q10; |
| 541 Winner_ind = 0; |
| 542 for( k = 1; k < nStatesDelayedDecision; k++ ) { |
| 543 if( psSampleState[ k ][ 0 ].RD_Q10 < RDmin_Q10 ) { |
| 544 RDmin_Q10 = psSampleState[ k ][ 0 ].RD_Q10; |
| 545 Winner_ind = k; |
| 546 } |
| 547 } |
| 548 |
| 549 /* Increase RD values of expired states */ |
| 550 Winner_rand_state = psDelDec[ Winner_ind ].RandState[ last_smple_idx ]; |
| 551 for( k = 0; k < nStatesDelayedDecision; k++ ) { |
| 552 if( psDelDec[ k ].RandState[ last_smple_idx ] != Winner_rand_state )
{ |
| 553 psSampleState[ k ][ 0 ].RD_Q10 = silk_ADD32( psSampleState[ k ][
0 ].RD_Q10, silk_int32_MAX >> 4 ); |
| 554 psSampleState[ k ][ 1 ].RD_Q10 = silk_ADD32( psSampleState[ k ][
1 ].RD_Q10, silk_int32_MAX >> 4 ); |
| 555 silk_assert( psSampleState[ k ][ 0 ].RD_Q10 >= 0 ); |
| 556 } |
| 557 } |
| 558 |
| 559 /* Find worst in first set and best in second set */ |
| 560 RDmax_Q10 = psSampleState[ 0 ][ 0 ].RD_Q10; |
| 561 RDmin_Q10 = psSampleState[ 0 ][ 1 ].RD_Q10; |
| 562 RDmax_ind = 0; |
| 563 RDmin_ind = 0; |
| 564 for( k = 1; k < nStatesDelayedDecision; k++ ) { |
| 565 /* find worst in first set */ |
| 566 if( psSampleState[ k ][ 0 ].RD_Q10 > RDmax_Q10 ) { |
| 567 RDmax_Q10 = psSampleState[ k ][ 0 ].RD_Q10; |
| 568 RDmax_ind = k; |
| 569 } |
| 570 /* find best in second set */ |
| 571 if( psSampleState[ k ][ 1 ].RD_Q10 < RDmin_Q10 ) { |
| 572 RDmin_Q10 = psSampleState[ k ][ 1 ].RD_Q10; |
| 573 RDmin_ind = k; |
| 574 } |
| 575 } |
| 576 |
| 577 /* Replace a state if best from second set outperforms worst in first se
t */ |
| 578 if( RDmin_Q10 < RDmax_Q10 ) { |
| 579 silk_memcpy( ( (opus_int32 *)&psDelDec[ RDmax_ind ] ) + i, |
| 580 ( (opus_int32 *)&psDelDec[ RDmin_ind ] ) + i, sizeof( N
SQ_del_dec_struct ) - i * sizeof( opus_int32) ); |
| 581 silk_memcpy( &psSampleState[ RDmax_ind ][ 0 ], &psSampleState[ RDmin
_ind ][ 1 ], sizeof( NSQ_sample_struct ) ); |
| 582 } |
| 583 |
| 584 /* Write samples from winner to output and long-term filter states */ |
| 585 psDD = &psDelDec[ Winner_ind ]; |
| 586 if( subfr > 0 || i >= decisionDelay ) { |
| 587 pulses[ i - decisionDelay ] = (opus_int8)silk_RSHIFT_ROUND( psDD->Q
_Q10[ last_smple_idx ], 10 ); |
| 588 xq[ i - decisionDelay ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( |
| 589 silk_SMULWW( psDD->Xq_Q14[ last_smple_idx ], delayedGain_Q10[ la
st_smple_idx ] ), 8 ) ); |
| 590 NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - decisionDelay ] = psDD->S
hape_Q14[ last_smple_idx ]; |
| 591 sLTP_Q15[ NSQ->sLTP_buf_idx - decisionDelay ] = psDD->P
red_Q15[ last_smple_idx ]; |
| 592 } |
| 593 NSQ->sLTP_shp_buf_idx++; |
| 594 NSQ->sLTP_buf_idx++; |
| 595 |
| 596 /* Update states */ |
| 597 for( k = 0; k < nStatesDelayedDecision; k++ ) { |
| 598 psDD = &psDelDec[ k ]; |
| 599 psSS = &psSampleState[ k ][ 0 ]; |
| 600 psDD->LF_AR_Q14 = psSS->LF_AR_Q14; |
| 601 psDD->sLPC_Q14[ NSQ_LPC_BUF_LENGTH + i ] = psSS->xq_Q14; |
| 602 psDD->Xq_Q14[ *smpl_buf_idx ] = psSS->xq_Q14; |
| 603 psDD->Q_Q10[ *smpl_buf_idx ] = psSS->Q_Q10; |
| 604 psDD->Pred_Q15[ *smpl_buf_idx ] = silk_LSHIFT32( psSS->LPC_
exc_Q14, 1 ); |
| 605 psDD->Shape_Q14[ *smpl_buf_idx ] = psSS->sLTP_shp_Q14; |
| 606 psDD->Seed = silk_ADD32_ovflw( psDD->S
eed, silk_RSHIFT_ROUND( psSS->Q_Q10, 10 ) ); |
| 607 psDD->RandState[ *smpl_buf_idx ] = psDD->Seed; |
| 608 psDD->RD_Q10 = psSS->RD_Q10; |
| 609 } |
| 610 delayedGain_Q10[ *smpl_buf_idx ] = Gain_Q10; |
| 611 } |
| 612 /* Update LPC states */ |
| 613 for( k = 0; k < nStatesDelayedDecision; k++ ) { |
| 614 psDD = &psDelDec[ k ]; |
| 615 silk_memcpy( psDD->sLPC_Q14, &psDD->sLPC_Q14[ length ], NSQ_LPC_BUF_LENG
TH * sizeof( opus_int32 ) ); |
| 616 } |
| 617 } |
| 618 |
| 619 static inline void silk_nsq_del_dec_scale_states( |
| 620 const silk_encoder_state *psEncC, /* I Encoder State
*/ |
| 621 silk_nsq_state *NSQ, /* I/O NSQ state
*/ |
| 622 NSQ_del_dec_struct psDelDec[], /* I/O Delayed decision sta
tes */ |
| 623 const opus_int32 x_Q3[], /* I Input in Q3
*/ |
| 624 opus_int32 x_sc_Q10[], /* O Input scaled with 1/
Gain in Q10 */ |
| 625 const opus_int16 sLTP[], /* I Re-whitened LTP stat
e in Q0 */ |
| 626 opus_int32 sLTP_Q15[], /* O LTP state matching s
caled input */ |
| 627 opus_int subfr, /* I Subframe number
*/ |
| 628 opus_int nStatesDelayedDecision, /* I Number of del dec st
ates */ |
| 629 const opus_int LTP_scale_Q14, /* I LTP state scaling
*/ |
| 630 const opus_int32 Gains_Q16[ MAX_NB_SUBFR ], /* I
*/ |
| 631 const opus_int pitchL[ MAX_NB_SUBFR ], /* I Pitch lag
*/ |
| 632 const opus_int signal_type, /* I Signal type
*/ |
| 633 const opus_int decisionDelay /* I Decision delay
*/ |
| 634 ) |
| 635 { |
| 636 opus_int i, k, lag; |
| 637 opus_int32 gain_adj_Q16, inv_gain_Q31, inv_gain_Q23; |
| 638 NSQ_del_dec_struct *psDD; |
| 639 |
| 640 lag = pitchL[ subfr ]; |
| 641 inv_gain_Q31 = silk_INVERSE32_varQ( silk_max( Gains_Q16[ subfr ], 1 ), 47 ); |
| 642 silk_assert( inv_gain_Q31 != 0 ); |
| 643 |
| 644 /* Calculate gain adjustment factor */ |
| 645 if( Gains_Q16[ subfr ] != NSQ->prev_gain_Q16 ) { |
| 646 gain_adj_Q16 = silk_DIV32_varQ( NSQ->prev_gain_Q16, Gains_Q16[ subfr ],
16 ); |
| 647 } else { |
| 648 gain_adj_Q16 = (opus_int32)1 << 16; |
| 649 } |
| 650 |
| 651 /* Scale input */ |
| 652 inv_gain_Q23 = silk_RSHIFT_ROUND( inv_gain_Q31, 8 ); |
| 653 for( i = 0; i < psEncC->subfr_length; i++ ) { |
| 654 x_sc_Q10[ i ] = silk_SMULWW( x_Q3[ i ], inv_gain_Q23 ); |
| 655 } |
| 656 |
| 657 /* Save inverse gain */ |
| 658 NSQ->prev_gain_Q16 = Gains_Q16[ subfr ]; |
| 659 |
| 660 /* After rewhitening the LTP state is un-scaled, so scale with inv_gain_Q16
*/ |
| 661 if( NSQ->rewhite_flag ) { |
| 662 if( subfr == 0 ) { |
| 663 /* Do LTP downscaling */ |
| 664 inv_gain_Q31 = silk_LSHIFT( silk_SMULWB( inv_gain_Q31, LTP_scale_Q14
), 2 ); |
| 665 } |
| 666 for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx;
i++ ) { |
| 667 silk_assert( i < MAX_FRAME_LENGTH ); |
| 668 sLTP_Q15[ i ] = silk_SMULWB( inv_gain_Q31, sLTP[ i ] ); |
| 669 } |
| 670 } |
| 671 |
| 672 /* Adjust for changing gain */ |
| 673 if( gain_adj_Q16 != (opus_int32)1 << 16 ) { |
| 674 /* Scale long-term shaping state */ |
| 675 for( i = NSQ->sLTP_shp_buf_idx - psEncC->ltp_mem_length; i < NSQ->sLTP_s
hp_buf_idx; i++ ) { |
| 676 NSQ->sLTP_shp_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sLTP_shp_Q1
4[ i ] ); |
| 677 } |
| 678 |
| 679 /* Scale long-term prediction state */ |
| 680 if( signal_type == TYPE_VOICED && NSQ->rewhite_flag == 0 ) { |
| 681 for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_
idx - decisionDelay; i++ ) { |
| 682 sLTP_Q15[ i ] = silk_SMULWW( gain_adj_Q16, sLTP_Q15[ i ] ); |
| 683 } |
| 684 } |
| 685 |
| 686 for( k = 0; k < nStatesDelayedDecision; k++ ) { |
| 687 psDD = &psDelDec[ k ]; |
| 688 |
| 689 /* Scale scalar states */ |
| 690 psDD->LF_AR_Q14 = silk_SMULWW( gain_adj_Q16, psDD->LF_AR_Q14 ); |
| 691 |
| 692 /* Scale short-term prediction and shaping states */ |
| 693 for( i = 0; i < NSQ_LPC_BUF_LENGTH; i++ ) { |
| 694 psDD->sLPC_Q14[ i ] = silk_SMULWW( gain_adj_Q16, psDD->sLPC_Q14[
i ] ); |
| 695 } |
| 696 for( i = 0; i < MAX_SHAPE_LPC_ORDER; i++ ) { |
| 697 psDD->sAR2_Q14[ i ] = silk_SMULWW( gain_adj_Q16, psDD->sAR2_Q14[
i ] ); |
| 698 } |
| 699 for( i = 0; i < DECISION_DELAY; i++ ) { |
| 700 psDD->Pred_Q15[ i ] = silk_SMULWW( gain_adj_Q16, psDD->Pred_Q15
[ i ] ); |
| 701 psDD->Shape_Q14[ i ] = silk_SMULWW( gain_adj_Q16, psDD->Shape_Q1
4[ i ] ); |
| 702 } |
| 703 } |
| 704 } |
| 705 } |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 11196031:
Add copy of opus library in deps/third_party. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/deps/third_party/