• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 #include "stack_alloc.h"
34 #include "NSQ.h"
35 
36 
37 static OPUS_INLINE void silk_nsq_scale_states(
38     const silk_encoder_state *psEncC,           /* I    Encoder State                   */
39     silk_nsq_state      *NSQ,                   /* I/O  NSQ state                       */
40     const opus_int32    x_Q3[],                 /* I    input in Q3                     */
41     opus_int32          x_sc_Q10[],             /* O    input scaled with 1/Gain        */
42     const opus_int16    sLTP[],                 /* I    re-whitened LTP state in Q0     */
43     opus_int32          sLTP_Q15[],             /* O    LTP state matching scaled input */
44     opus_int            subfr,                  /* I    subframe number                 */
45     const opus_int      LTP_scale_Q14,          /* I                                    */
46     const opus_int32    Gains_Q16[ MAX_NB_SUBFR ], /* I                                 */
47     const opus_int      pitchL[ MAX_NB_SUBFR ], /* I    Pitch lag                       */
48     const opus_int      signal_type             /* I    Signal type                     */
49 );
50 
51 #if !defined(OPUS_X86_MAY_HAVE_SSE4_1)
52 static OPUS_INLINE void silk_noise_shape_quantizer(
53     silk_nsq_state      *NSQ,                   /* I/O  NSQ state                       */
54     opus_int            signalType,             /* I    Signal type                     */
55     const opus_int32    x_sc_Q10[],             /* I                                    */
56     opus_int8           pulses[],               /* O                                    */
57     opus_int16          xq[],                   /* O                                    */
58     opus_int32          sLTP_Q15[],             /* I/O  LTP state                       */
59     const opus_int16    a_Q12[],                /* I    Short term prediction coefs     */
60     const opus_int16    b_Q14[],                /* I    Long term prediction coefs      */
61     const opus_int16    AR_shp_Q13[],           /* I    Noise shaping AR coefs          */
62     opus_int            lag,                    /* I    Pitch lag                       */
63     opus_int32          HarmShapeFIRPacked_Q14, /* I                                    */
64     opus_int            Tilt_Q14,               /* I    Spectral tilt                   */
65     opus_int32          LF_shp_Q14,             /* I                                    */
66     opus_int32          Gain_Q16,               /* I                                    */
67     opus_int            Lambda_Q10,             /* I                                    */
68     opus_int            offset_Q10,             /* I                                    */
69     opus_int            length,                 /* I    Input length                    */
70     opus_int            shapingLPCOrder,        /* I    Noise shaping AR filter order   */
71     opus_int            predictLPCOrder,        /* I    Prediction filter order         */
72     int                 arch                    /* I    Architecture                    */
73 );
74 #endif
75 
silk_NSQ_c(const silk_encoder_state * psEncC,silk_nsq_state * NSQ,SideInfoIndices * psIndices,const opus_int32 x_Q3[],opus_int8 pulses[],const opus_int16 PredCoef_Q12[2* MAX_LPC_ORDER],const opus_int16 LTPCoef_Q14[LTP_ORDER * MAX_NB_SUBFR],const opus_int16 AR2_Q13[MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER],const opus_int HarmShapeGain_Q14[MAX_NB_SUBFR],const opus_int Tilt_Q14[MAX_NB_SUBFR],const opus_int32 LF_shp_Q14[MAX_NB_SUBFR],const opus_int32 Gains_Q16[MAX_NB_SUBFR],const opus_int pitchL[MAX_NB_SUBFR],const opus_int Lambda_Q10,const opus_int LTP_scale_Q14)76 void silk_NSQ_c
77 (
78     const silk_encoder_state    *psEncC,                                    /* I/O  Encoder State                   */
79     silk_nsq_state              *NSQ,                                       /* I/O  NSQ state                       */
80     SideInfoIndices             *psIndices,                                 /* I/O  Quantization Indices            */
81     const opus_int32            x_Q3[],                                     /* I    Prefiltered input signal        */
82     opus_int8                   pulses[],                                   /* O    Quantized pulse signal          */
83     const opus_int16            PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefs     */
84     const opus_int16            LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    Long term prediction coefs      */
85     const opus_int16            AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I Noise shaping coefs             */
86     const opus_int              HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I    Long term shaping coefs         */
87     const opus_int              Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                   */
88     const opus_int32            LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I    Low frequency shaping coefs     */
89     const opus_int32            Gains_Q16[ MAX_NB_SUBFR ],                  /* I    Quantization step sizes         */
90     const opus_int              pitchL[ MAX_NB_SUBFR ],                     /* I    Pitch lags                      */
91     const opus_int              Lambda_Q10,                                 /* I    Rate/distortion tradeoff        */
92     const opus_int              LTP_scale_Q14                               /* I    LTP state scaling               */
93 )
94 {
95     opus_int            k, lag, start_idx, LSF_interpolation_flag;
96     const opus_int16    *A_Q12, *B_Q14, *AR_shp_Q13;
97     opus_int16          *pxq;
98     VARDECL( opus_int32, sLTP_Q15 );
99     VARDECL( opus_int16, sLTP );
100     opus_int32          HarmShapeFIRPacked_Q14;
101     opus_int            offset_Q10;
102     VARDECL( opus_int32, x_sc_Q10 );
103     SAVE_STACK;
104 
105     NSQ->rand_seed = psIndices->Seed;
106 
107     /* Set unvoiced lag to the previous one, overwrite later for voiced */
108     lag = NSQ->lagPrev;
109 
110     silk_assert( NSQ->prev_gain_Q16 != 0 );
111 
112     offset_Q10 = silk_Quantization_Offsets_Q10[ psIndices->signalType >> 1 ][ psIndices->quantOffsetType ];
113 
114     if( psIndices->NLSFInterpCoef_Q2 == 4 ) {
115         LSF_interpolation_flag = 0;
116     } else {
117         LSF_interpolation_flag = 1;
118     }
119 
120     ALLOC( sLTP_Q15,
121            psEncC->ltp_mem_length + psEncC->frame_length, opus_int32 );
122     ALLOC( sLTP, psEncC->ltp_mem_length + psEncC->frame_length, opus_int16 );
123     ALLOC( x_sc_Q10, psEncC->subfr_length, opus_int32 );
124     /* Set up pointers to start of sub frame */
125     NSQ->sLTP_shp_buf_idx = psEncC->ltp_mem_length;
126     NSQ->sLTP_buf_idx     = psEncC->ltp_mem_length;
127     pxq                   = &NSQ->xq[ psEncC->ltp_mem_length ];
128     for( k = 0; k < psEncC->nb_subfr; k++ ) {
129         A_Q12      = &PredCoef_Q12[ (( k >> 1 ) | ( 1 - LSF_interpolation_flag )) * MAX_LPC_ORDER ];
130         B_Q14      = &LTPCoef_Q14[ k * LTP_ORDER ];
131         AR_shp_Q13 = &AR2_Q13[     k * MAX_SHAPE_LPC_ORDER ];
132 
133         /* Noise shape parameters */
134         silk_assert( HarmShapeGain_Q14[ k ] >= 0 );
135         HarmShapeFIRPacked_Q14  =                          silk_RSHIFT( HarmShapeGain_Q14[ k ], 2 );
136         HarmShapeFIRPacked_Q14 |= silk_LSHIFT( (opus_int32)silk_RSHIFT( HarmShapeGain_Q14[ k ], 1 ), 16 );
137 
138         NSQ->rewhite_flag = 0;
139         if( psIndices->signalType == TYPE_VOICED ) {
140             /* Voiced */
141             lag = pitchL[ k ];
142 
143             /* Re-whitening */
144             if( ( k & ( 3 - silk_LSHIFT( LSF_interpolation_flag, 1 ) ) ) == 0 ) {
145                 /* Rewhiten with new A coefs */
146                 start_idx = psEncC->ltp_mem_length - lag - psEncC->predictLPCOrder - LTP_ORDER / 2;
147                 silk_assert( start_idx > 0 );
148 
149                 silk_LPC_analysis_filter( &sLTP[ start_idx ], &NSQ->xq[ start_idx + k * psEncC->subfr_length ],
150                     A_Q12, psEncC->ltp_mem_length - start_idx, psEncC->predictLPCOrder, psEncC->arch );
151 
152                 NSQ->rewhite_flag = 1;
153                 NSQ->sLTP_buf_idx = psEncC->ltp_mem_length;
154             }
155         }
156 
157         silk_nsq_scale_states( psEncC, NSQ, x_Q3, x_sc_Q10, sLTP, sLTP_Q15, k, LTP_scale_Q14, Gains_Q16, pitchL, psIndices->signalType );
158 
159         silk_noise_shape_quantizer( NSQ, psIndices->signalType, x_sc_Q10, pulses, pxq, sLTP_Q15, A_Q12, B_Q14,
160             AR_shp_Q13, lag, HarmShapeFIRPacked_Q14, Tilt_Q14[ k ], LF_shp_Q14[ k ], Gains_Q16[ k ], Lambda_Q10,
161             offset_Q10, psEncC->subfr_length, psEncC->shapingLPCOrder, psEncC->predictLPCOrder, psEncC->arch );
162 
163         x_Q3   += psEncC->subfr_length;
164         pulses += psEncC->subfr_length;
165         pxq    += psEncC->subfr_length;
166     }
167 
168     /* Update lagPrev for next frame */
169     NSQ->lagPrev = pitchL[ psEncC->nb_subfr - 1 ];
170 
171     /* Save quantized speech and noise shaping signals */
172     /* DEBUG_STORE_DATA( enc.pcm, &NSQ->xq[ psEncC->ltp_mem_length ], psEncC->frame_length * sizeof( opus_int16 ) ) */
173     silk_memmove( NSQ->xq,           &NSQ->xq[           psEncC->frame_length ], psEncC->ltp_mem_length * sizeof( opus_int16 ) );
174     silk_memmove( NSQ->sLTP_shp_Q14, &NSQ->sLTP_shp_Q14[ psEncC->frame_length ], psEncC->ltp_mem_length * sizeof( opus_int32 ) );
175     RESTORE_STACK;
176 }
177 
178 /***********************************/
179 /* silk_noise_shape_quantizer  */
180 /***********************************/
181 
182 #if !defined(OPUS_X86_MAY_HAVE_SSE4_1)
183 static OPUS_INLINE
184 #endif
silk_noise_shape_quantizer(silk_nsq_state * NSQ,opus_int signalType,const opus_int32 x_sc_Q10[],opus_int8 pulses[],opus_int16 xq[],opus_int32 sLTP_Q15[],const opus_int16 a_Q12[],const opus_int16 b_Q14[],const opus_int16 AR_shp_Q13[],opus_int lag,opus_int32 HarmShapeFIRPacked_Q14,opus_int Tilt_Q14,opus_int32 LF_shp_Q14,opus_int32 Gain_Q16,opus_int Lambda_Q10,opus_int offset_Q10,opus_int length,opus_int shapingLPCOrder,opus_int predictLPCOrder,int arch)185 void silk_noise_shape_quantizer(
186     silk_nsq_state      *NSQ,                   /* I/O  NSQ state                       */
187     opus_int            signalType,             /* I    Signal type                     */
188     const opus_int32    x_sc_Q10[],             /* I                                    */
189     opus_int8           pulses[],               /* O                                    */
190     opus_int16          xq[],                   /* O                                    */
191     opus_int32          sLTP_Q15[],             /* I/O  LTP state                       */
192     const opus_int16    a_Q12[],                /* I    Short term prediction coefs     */
193     const opus_int16    b_Q14[],                /* I    Long term prediction coefs      */
194     const opus_int16    AR_shp_Q13[],           /* I    Noise shaping AR coefs          */
195     opus_int            lag,                    /* I    Pitch lag                       */
196     opus_int32          HarmShapeFIRPacked_Q14, /* I                                    */
197     opus_int            Tilt_Q14,               /* I    Spectral tilt                   */
198     opus_int32          LF_shp_Q14,             /* I                                    */
199     opus_int32          Gain_Q16,               /* I                                    */
200     opus_int            Lambda_Q10,             /* I                                    */
201     opus_int            offset_Q10,             /* I                                    */
202     opus_int            length,                 /* I    Input length                    */
203     opus_int            shapingLPCOrder,        /* I    Noise shaping AR filter order   */
204     opus_int            predictLPCOrder,        /* I    Prediction filter order         */
205     int                 arch                    /* I    Architecture                    */
206 )
207 {
208     opus_int     i;
209     opus_int32   LTP_pred_Q13, LPC_pred_Q10, n_AR_Q12, n_LTP_Q13;
210     opus_int32   n_LF_Q12, r_Q10, rr_Q10, q1_Q0, q1_Q10, q2_Q10, rd1_Q20, rd2_Q20;
211     opus_int32   exc_Q14, LPC_exc_Q14, xq_Q14, Gain_Q10;
212     opus_int32   tmp1, tmp2, sLF_AR_shp_Q14;
213     opus_int32   *psLPC_Q14, *shp_lag_ptr, *pred_lag_ptr;
214 #ifdef silk_short_prediction_create_arch_coef
215     opus_int32   a_Q12_arch[MAX_LPC_ORDER];
216 #endif
217 
218     shp_lag_ptr  = &NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - lag + HARM_SHAPE_FIR_TAPS / 2 ];
219     pred_lag_ptr = &sLTP_Q15[ NSQ->sLTP_buf_idx - lag + LTP_ORDER / 2 ];
220     Gain_Q10     = silk_RSHIFT( Gain_Q16, 6 );
221 
222     /* Set up short term AR state */
223     psLPC_Q14 = &NSQ->sLPC_Q14[ NSQ_LPC_BUF_LENGTH - 1 ];
224 
225 #ifdef silk_short_prediction_create_arch_coef
226     silk_short_prediction_create_arch_coef(a_Q12_arch, a_Q12, predictLPCOrder);
227 #endif
228 
229     for( i = 0; i < length; i++ ) {
230         /* Generate dither */
231         NSQ->rand_seed = silk_RAND( NSQ->rand_seed );
232 
233         /* Short-term prediction */
234         LPC_pred_Q10 = silk_noise_shape_quantizer_short_prediction(psLPC_Q14, a_Q12, a_Q12_arch, predictLPCOrder, arch);
235 
236         /* Long-term prediction */
237         if( signalType == TYPE_VOICED ) {
238             /* Unrolled loop */
239             /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
240             LTP_pred_Q13 = 2;
241             LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[  0 ], b_Q14[ 0 ] );
242             LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -1 ], b_Q14[ 1 ] );
243             LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -2 ], b_Q14[ 2 ] );
244             LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -3 ], b_Q14[ 3 ] );
245             LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -4 ], b_Q14[ 4 ] );
246             pred_lag_ptr++;
247         } else {
248             LTP_pred_Q13 = 0;
249         }
250 
251         /* Noise shape feedback */
252         silk_assert( ( shapingLPCOrder & 1 ) == 0 );   /* check that order is even */
253         n_AR_Q12 = silk_NSQ_noise_shape_feedback_loop(psLPC_Q14, NSQ->sAR2_Q14, AR_shp_Q13, shapingLPCOrder, arch);
254 
255         n_AR_Q12 = silk_SMLAWB( n_AR_Q12, NSQ->sLF_AR_shp_Q14, Tilt_Q14 );
256 
257         n_LF_Q12 = silk_SMULWB( NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - 1 ], LF_shp_Q14 );
258         n_LF_Q12 = silk_SMLAWT( n_LF_Q12, NSQ->sLF_AR_shp_Q14, LF_shp_Q14 );
259 
260         silk_assert( lag > 0 || signalType != TYPE_VOICED );
261 
262         /* Combine prediction and noise shaping signals */
263         tmp1 = silk_SUB32( silk_LSHIFT32( LPC_pred_Q10, 2 ), n_AR_Q12 );        /* Q12 */
264         tmp1 = silk_SUB32( tmp1, n_LF_Q12 );                                    /* Q12 */
265         if( lag > 0 ) {
266             /* Symmetric, packed FIR coefficients */
267             n_LTP_Q13 = silk_SMULWB( silk_ADD32( shp_lag_ptr[ 0 ], shp_lag_ptr[ -2 ] ), HarmShapeFIRPacked_Q14 );
268             n_LTP_Q13 = silk_SMLAWT( n_LTP_Q13, shp_lag_ptr[ -1 ],                      HarmShapeFIRPacked_Q14 );
269             n_LTP_Q13 = silk_LSHIFT( n_LTP_Q13, 1 );
270             shp_lag_ptr++;
271 
272             tmp2 = silk_SUB32( LTP_pred_Q13, n_LTP_Q13 );                       /* Q13 */
273             tmp1 = silk_ADD_LSHIFT32( tmp2, tmp1, 1 );                          /* Q13 */
274             tmp1 = silk_RSHIFT_ROUND( tmp1, 3 );                                /* Q10 */
275         } else {
276             tmp1 = silk_RSHIFT_ROUND( tmp1, 2 );                                /* Q10 */
277         }
278 
279         r_Q10 = silk_SUB32( x_sc_Q10[ i ], tmp1 );                              /* residual error Q10 */
280 
281         /* Flip sign depending on dither */
282         if ( NSQ->rand_seed < 0 ) {
283            r_Q10 = -r_Q10;
284         }
285         r_Q10 = silk_LIMIT_32( r_Q10, -(31 << 10), 30 << 10 );
286 
287         /* Find two quantization level candidates and measure their rate-distortion */
288         q1_Q10 = silk_SUB32( r_Q10, offset_Q10 );
289         q1_Q0 = silk_RSHIFT( q1_Q10, 10 );
290         if( q1_Q0 > 0 ) {
291             q1_Q10  = silk_SUB32( silk_LSHIFT( q1_Q0, 10 ), QUANT_LEVEL_ADJUST_Q10 );
292             q1_Q10  = silk_ADD32( q1_Q10, offset_Q10 );
293             q2_Q10  = silk_ADD32( q1_Q10, 1024 );
294             rd1_Q20 = silk_SMULBB( q1_Q10, Lambda_Q10 );
295             rd2_Q20 = silk_SMULBB( q2_Q10, Lambda_Q10 );
296         } else if( q1_Q0 == 0 ) {
297             q1_Q10  = offset_Q10;
298             q2_Q10  = silk_ADD32( q1_Q10, 1024 - QUANT_LEVEL_ADJUST_Q10 );
299             rd1_Q20 = silk_SMULBB( q1_Q10, Lambda_Q10 );
300             rd2_Q20 = silk_SMULBB( q2_Q10, Lambda_Q10 );
301         } else if( q1_Q0 == -1 ) {
302             q2_Q10  = offset_Q10;
303             q1_Q10  = silk_SUB32( q2_Q10, 1024 - QUANT_LEVEL_ADJUST_Q10 );
304             rd1_Q20 = silk_SMULBB( -q1_Q10, Lambda_Q10 );
305             rd2_Q20 = silk_SMULBB(  q2_Q10, Lambda_Q10 );
306         } else {            /* Q1_Q0 < -1 */
307             q1_Q10  = silk_ADD32( silk_LSHIFT( q1_Q0, 10 ), QUANT_LEVEL_ADJUST_Q10 );
308             q1_Q10  = silk_ADD32( q1_Q10, offset_Q10 );
309             q2_Q10  = silk_ADD32( q1_Q10, 1024 );
310             rd1_Q20 = silk_SMULBB( -q1_Q10, Lambda_Q10 );
311             rd2_Q20 = silk_SMULBB( -q2_Q10, Lambda_Q10 );
312         }
313         rr_Q10  = silk_SUB32( r_Q10, q1_Q10 );
314         rd1_Q20 = silk_SMLABB( rd1_Q20, rr_Q10, rr_Q10 );
315         rr_Q10  = silk_SUB32( r_Q10, q2_Q10 );
316         rd2_Q20 = silk_SMLABB( rd2_Q20, rr_Q10, rr_Q10 );
317 
318         if( rd2_Q20 < rd1_Q20 ) {
319             q1_Q10 = q2_Q10;
320         }
321 
322         pulses[ i ] = (opus_int8)silk_RSHIFT_ROUND( q1_Q10, 10 );
323 
324         /* Excitation */
325         exc_Q14 = silk_LSHIFT( q1_Q10, 4 );
326         if ( NSQ->rand_seed < 0 ) {
327            exc_Q14 = -exc_Q14;
328         }
329 
330         /* Add predictions */
331         LPC_exc_Q14 = silk_ADD_LSHIFT32( exc_Q14, LTP_pred_Q13, 1 );
332         xq_Q14      = silk_ADD_LSHIFT32( LPC_exc_Q14, LPC_pred_Q10, 4 );
333 
334         /* Scale XQ back to normal level before saving */
335         xq[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( xq_Q14, Gain_Q10 ), 8 ) );
336 
337         /* Update states */
338         psLPC_Q14++;
339         *psLPC_Q14 = xq_Q14;
340         sLF_AR_shp_Q14 = silk_SUB_LSHIFT32( xq_Q14, n_AR_Q12, 2 );
341         NSQ->sLF_AR_shp_Q14 = sLF_AR_shp_Q14;
342 
343         NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx ] = silk_SUB_LSHIFT32( sLF_AR_shp_Q14, n_LF_Q12, 2 );
344         sLTP_Q15[ NSQ->sLTP_buf_idx ] = silk_LSHIFT( LPC_exc_Q14, 1 );
345         NSQ->sLTP_shp_buf_idx++;
346         NSQ->sLTP_buf_idx++;
347 
348         /* Make dither dependent on quantized signal */
349         NSQ->rand_seed = silk_ADD32_ovflw( NSQ->rand_seed, pulses[ i ] );
350     }
351 
352     /* Update LPC synth buffer */
353     silk_memcpy( NSQ->sLPC_Q14, &NSQ->sLPC_Q14[ length ], NSQ_LPC_BUF_LENGTH * sizeof( opus_int32 ) );
354 }
355 
silk_nsq_scale_states(const silk_encoder_state * psEncC,silk_nsq_state * NSQ,const opus_int32 x_Q3[],opus_int32 x_sc_Q10[],const opus_int16 sLTP[],opus_int32 sLTP_Q15[],opus_int subfr,const opus_int LTP_scale_Q14,const opus_int32 Gains_Q16[MAX_NB_SUBFR],const opus_int pitchL[MAX_NB_SUBFR],const opus_int signal_type)356 static OPUS_INLINE void silk_nsq_scale_states(
357     const silk_encoder_state *psEncC,           /* I    Encoder State                   */
358     silk_nsq_state      *NSQ,                   /* I/O  NSQ state                       */
359     const opus_int32    x_Q3[],                 /* I    input in Q3                     */
360     opus_int32          x_sc_Q10[],             /* O    input scaled with 1/Gain        */
361     const opus_int16    sLTP[],                 /* I    re-whitened LTP state in Q0     */
362     opus_int32          sLTP_Q15[],             /* O    LTP state matching scaled input */
363     opus_int            subfr,                  /* I    subframe number                 */
364     const opus_int      LTP_scale_Q14,          /* I                                    */
365     const opus_int32    Gains_Q16[ MAX_NB_SUBFR ], /* I                                 */
366     const opus_int      pitchL[ MAX_NB_SUBFR ], /* I    Pitch lag                       */
367     const opus_int      signal_type             /* I    Signal type                     */
368 )
369 {
370     opus_int   i, lag;
371     opus_int32 gain_adj_Q16, inv_gain_Q31, inv_gain_Q23;
372 
373     lag          = pitchL[ subfr ];
374     inv_gain_Q31 = silk_INVERSE32_varQ( silk_max( Gains_Q16[ subfr ], 1 ), 47 );
375     silk_assert( inv_gain_Q31 != 0 );
376 
377     /* Calculate gain adjustment factor */
378     if( Gains_Q16[ subfr ] != NSQ->prev_gain_Q16 ) {
379         gain_adj_Q16 =  silk_DIV32_varQ( NSQ->prev_gain_Q16, Gains_Q16[ subfr ], 16 );
380     } else {
381         gain_adj_Q16 = (opus_int32)1 << 16;
382     }
383 
384     /* Scale input */
385     inv_gain_Q23 = silk_RSHIFT_ROUND( inv_gain_Q31, 8 );
386     for( i = 0; i < psEncC->subfr_length; i++ ) {
387         x_sc_Q10[ i ] = silk_SMULWW( x_Q3[ i ], inv_gain_Q23 );
388     }
389 
390     /* Save inverse gain */
391     NSQ->prev_gain_Q16 = Gains_Q16[ subfr ];
392 
393     /* After rewhitening the LTP state is un-scaled, so scale with inv_gain_Q16 */
394     if( NSQ->rewhite_flag ) {
395         if( subfr == 0 ) {
396             /* Do LTP downscaling */
397             inv_gain_Q31 = silk_LSHIFT( silk_SMULWB( inv_gain_Q31, LTP_scale_Q14 ), 2 );
398         }
399         for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx; i++ ) {
400             silk_assert( i < MAX_FRAME_LENGTH );
401             sLTP_Q15[ i ] = silk_SMULWB( inv_gain_Q31, sLTP[ i ] );
402         }
403     }
404 
405     /* Adjust for changing gain */
406     if( gain_adj_Q16 != (opus_int32)1 << 16 ) {
407         /* Scale long-term shaping state */
408         for( i = NSQ->sLTP_shp_buf_idx - psEncC->ltp_mem_length; i < NSQ->sLTP_shp_buf_idx; i++ ) {
409             NSQ->sLTP_shp_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sLTP_shp_Q14[ i ] );
410         }
411 
412         /* Scale long-term prediction state */
413         if( signal_type == TYPE_VOICED && NSQ->rewhite_flag == 0 ) {
414             for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx; i++ ) {
415                 sLTP_Q15[ i ] = silk_SMULWW( gain_adj_Q16, sLTP_Q15[ i ] );
416             }
417         }
418 
419         NSQ->sLF_AR_shp_Q14 = silk_SMULWW( gain_adj_Q16, NSQ->sLF_AR_shp_Q14 );
420 
421         /* Scale short-term prediction and shaping states */
422         for( i = 0; i < NSQ_LPC_BUF_LENGTH; i++ ) {
423             NSQ->sLPC_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sLPC_Q14[ i ] );
424         }
425         for( i = 0; i < MAX_SHAPE_LPC_ORDER; i++ ) {
426             NSQ->sAR2_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sAR2_Q14[ i ] );
427         }
428     }
429 }
430