Removed all the silk_ prefixes in source file names (not symbols)

1 files changed, 431 insertions, 0 deletions

diff --git a/silk/NSQ.c b/silk/NSQ.c
new file mode 100644
index 00000000..76e81346
--- /dev/null
+++ b/silk/NSQ.c
@@ -0,0 +1,431 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, (subject to the limitations in the disclaimer below)
+are permitted provided that the following conditions are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Skype Limited, nor the names of specific
+contributors, may be used to endorse or promote products derived from
+this software without specific prior written permission.
+NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
+BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "main.h"
+
+static inline void silk_nsq_scale_states(
+    const silk_encoder_state *psEncC,       /* I    Encoder State                   */
+    silk_nsq_state      *NSQ,               /* I/O  NSQ state                       */
+    const opus_int16     x[],                /* I    input in Q0                     */
+    opus_int32           x_sc_Q10[],         /* O    input scaled with 1/Gain        */
+    const opus_int16     sLTP[],             /* I    re-whitened LTP state in Q0     */
+    opus_int32           sLTP_Q16[],         /* O    LTP state matching scaled input */
+    opus_int             subfr,              /* I    subframe number                 */
+    const opus_int       LTP_scale_Q14,      /* I                                    */
+    const opus_int32     Gains_Q16[ MAX_NB_SUBFR ], /* I                             */
+    const opus_int       pitchL[ MAX_NB_SUBFR ]  /* I                                */
+);
+
+static inline void silk_noise_shape_quantizer(
+    silk_nsq_state      *NSQ,               /* I/O  NSQ state                       */
+    opus_int             signalType,         /* I    Signal type                     */
+    const opus_int32     x_sc_Q10[],         /* I                                    */
+    opus_int8            pulses[],           /* O                                    */
+    opus_int16           xq[],               /* O                                    */
+    opus_int32           sLTP_Q16[],         /* I/O  LTP state                       */
+    const opus_int16     a_Q12[],            /* I    Short term prediction coefs     */
+    const opus_int16     b_Q14[],            /* I    Long term prediction coefs      */
+    const opus_int16     AR_shp_Q13[],       /* I    Noise shaping AR coefs          */
+    opus_int             lag,                /* I    Pitch lag                       */
+    opus_int32           HarmShapeFIRPacked_Q14, /* I                                */
+    opus_int             Tilt_Q14,           /* I    Spectral tilt                   */
+    opus_int32           LF_shp_Q14,         /* I                                    */
+    opus_int32           Gain_Q16,           /* I                                    */
+    opus_int             Lambda_Q10,         /* I                                    */
+    opus_int             offset_Q10,         /* I                                    */
+    opus_int             length,             /* I    Input length                    */
+    opus_int             shapingLPCOrder,    /* I    Noise shaping AR filter order   */
+    opus_int             predictLPCOrder     /* I    Prediction filter order         */
+);
+
+void silk_NSQ(
+    const silk_encoder_state        *psEncC,                                    /* I/O  Encoder State                       */
+    silk_nsq_state                  *NSQ,                                       /* I/O  NSQ state                           */
+    SideInfoIndices                 *psIndices,                                 /* I/O  Quantization Indices                */
+    const opus_int16                 x[],                                        /* I    prefiltered input signal            */
+    opus_int8                        pulses[],                                   /* O    quantized qulse signal              */
+    const opus_int16                 PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Short term prediction coefficients  */
+    const opus_int16                 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    Long term prediction coefficients   */
+    const opus_int16                 AR2_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I                                     */
+    const opus_int                   HarmShapeGain_Q14[ MAX_NB_SUBFR ],          /* I                                        */
+    const opus_int                   Tilt_Q14[ MAX_NB_SUBFR ],                   /* I    Spectral tilt                       */
+    const opus_int32                 LF_shp_Q14[ MAX_NB_SUBFR ],                 /* I                                        */
+    const opus_int32                 Gains_Q16[ MAX_NB_SUBFR ],                  /* I                                        */
+    const opus_int                   pitchL[ MAX_NB_SUBFR ],                     /* I                                        */
+    const opus_int                   Lambda_Q10,                                 /* I                                        */
+    const opus_int                   LTP_scale_Q14                               /* I    LTP state scaling                   */
+)
+{
+    opus_int     k, lag, start_idx, LSF_interpolation_flag;
+    const opus_int16 *A_Q12, *B_Q14, *AR_shp_Q13;
+    opus_int16   *pxq;
+    opus_int32   sLTP_Q16[ 2 * MAX_FRAME_LENGTH ];
+    opus_int16   sLTP[     2 * MAX_FRAME_LENGTH ];
+    opus_int32   HarmShapeFIRPacked_Q14;
+    opus_int     offset_Q10;
+    opus_int32   x_sc_Q10[ MAX_FRAME_LENGTH / MAX_NB_SUBFR ];
+
+    NSQ->rand_seed = psIndices->Seed;
+
+    /* Set unvoiced lag to the previous one, overwrite later for voiced */
+    lag = NSQ->lagPrev;
+
+    silk_assert( NSQ->prev_inv_gain_Q16 != 0 );
+
+    offset_Q10 = silk_Quantization_Offsets_Q10[ psIndices->signalType >> 1 ][ psIndices->quantOffsetType ];
+
+    if( psIndices->NLSFInterpCoef_Q2 == 4 ) {
+        LSF_interpolation_flag = 0;
+    } else {
+        LSF_interpolation_flag = 1;
+    }
+
+    /* Setup pointers to start of sub frame */
+    NSQ->sLTP_shp_buf_idx = psEncC->ltp_mem_length;
+    NSQ->sLTP_buf_idx     = psEncC->ltp_mem_length;
+    pxq                   = &NSQ->xq[ psEncC->ltp_mem_length ];
+    for( k = 0; k < psEncC->nb_subfr; k++ ) {
+        A_Q12      = &PredCoef_Q12[ (( k >> 1 ) | ( 1 - LSF_interpolation_flag )) * MAX_LPC_ORDER ];
+        B_Q14      = &LTPCoef_Q14[ k * LTP_ORDER ];
+        AR_shp_Q13 = &AR2_Q13[     k * MAX_SHAPE_LPC_ORDER ];
+
+        /* Noise shape parameters */
+        silk_assert( HarmShapeGain_Q14[ k ] >= 0 );
+        HarmShapeFIRPacked_Q14  =                          silk_RSHIFT( HarmShapeGain_Q14[ k ], 2 );
+        HarmShapeFIRPacked_Q14 |= silk_LSHIFT( ( opus_int32 )silk_RSHIFT( HarmShapeGain_Q14[ k ], 1 ), 16 );
+
+        NSQ->rewhite_flag = 0;
+        if( psIndices->signalType == TYPE_VOICED ) {
+            /* Voiced */
+            lag = pitchL[ k ];
+
+            /* Re-whitening */
+            if( ( k & ( 3 - silk_LSHIFT( LSF_interpolation_flag, 1 ) ) ) == 0 ) {
+                /* Rewhiten with new A coefs */
+                start_idx = psEncC->ltp_mem_length - lag - psEncC->predictLPCOrder - LTP_ORDER / 2;
+                silk_assert( start_idx > 0 );
+
+                silk_LPC_analysis_filter( &sLTP[ start_idx ], &NSQ->xq[ start_idx + k * psEncC->subfr_length ],
+                    A_Q12, psEncC->ltp_mem_length - start_idx, psEncC->predictLPCOrder );
+
+                NSQ->rewhite_flag = 1;
+                NSQ->sLTP_buf_idx = psEncC->ltp_mem_length;
+            }
+        }
+
+        silk_nsq_scale_states( psEncC, NSQ, x, x_sc_Q10, sLTP, sLTP_Q16, k, LTP_scale_Q14, Gains_Q16, pitchL );
+
+        silk_noise_shape_quantizer( NSQ, psIndices->signalType, x_sc_Q10, pulses, pxq, sLTP_Q16, A_Q12, B_Q14,
+            AR_shp_Q13, lag, HarmShapeFIRPacked_Q14, Tilt_Q14[ k ], LF_shp_Q14[ k ], Gains_Q16[ k ], Lambda_Q10,
+            offset_Q10, psEncC->subfr_length, psEncC->shapingLPCOrder, psEncC->predictLPCOrder );
+
+        x      += psEncC->subfr_length;
+        pulses += psEncC->subfr_length;
+        pxq    += psEncC->subfr_length;
+    }
+
+    /* Update lagPrev for next frame */
+    NSQ->lagPrev = pitchL[ psEncC->nb_subfr - 1 ];
+
+    /* Save quantized speech and noise shaping signals */
+    silk_memmove( NSQ->xq,           &NSQ->xq[           psEncC->frame_length ], psEncC->ltp_mem_length * sizeof( opus_int16 ) );
+    silk_memmove( NSQ->sLTP_shp_Q10, &NSQ->sLTP_shp_Q10[ psEncC->frame_length ], psEncC->ltp_mem_length * sizeof( opus_int32 ) );
+
+#ifdef SAVE_ALL_INTERNAL_DATA
+    DEBUG_STORE_DATA( xq.dat,       &pxq[ -psEncC->frame_length ],       psEncC->frame_length * sizeof( opus_int16 ) );
+    DEBUG_STORE_DATA( q.dat,        &pulses[ -psEncC->frame_length ],    psEncC->frame_length * sizeof( opus_int8 ) );
+    DEBUG_STORE_DATA( sLTP_Q16.dat, &sLTP_Q16[ psEncC->ltp_mem_length ], psEncC->frame_length * sizeof( opus_int32 ) );
+#endif
+}
+
+/***********************************/
+/* silk_noise_shape_quantizer  */
+/***********************************/
+static inline void silk_noise_shape_quantizer(
+    silk_nsq_state  *NSQ,               /* I/O  NSQ state                       */
+    opus_int             signalType,         /* I    Signal type                     */
+    const opus_int32     x_sc_Q10[],         /* I                                    */
+    opus_int8            pulses[],           /* O                                    */
+    opus_int16           xq[],               /* O                                    */
+    opus_int32           sLTP_Q16[],         /* I/O  LTP state                       */
+    const opus_int16     a_Q12[],            /* I    Short term prediction coefs     */
+    const opus_int16     b_Q14[],            /* I    Long term prediction coefs      */
+    const opus_int16     AR_shp_Q13[],       /* I    Noise shaping AR coefs          */
+    opus_int             lag,                /* I    Pitch lag                       */
+    opus_int32           HarmShapeFIRPacked_Q14, /* I                                */
+    opus_int             Tilt_Q14,           /* I    Spectral tilt                   */
+    opus_int32           LF_shp_Q14,         /* I                                    */
+    opus_int32           Gain_Q16,           /* I                                    */
+    opus_int             Lambda_Q10,         /* I                                    */
+    opus_int             offset_Q10,         /* I                                    */
+    opus_int             length,             /* I    Input length                    */
+    opus_int             shapingLPCOrder,    /* I    Noise shaping AR filter order   */
+    opus_int             predictLPCOrder     /* I    Prediction filter order         */
+)
+{
+    opus_int     i, j;
+    opus_int32   LTP_pred_Q14, LPC_pred_Q10, n_AR_Q10, n_LTP_Q14;
+    opus_int32   n_LF_Q10, r_Q10, rr_Q10, q1_Q10, q2_Q10, rd1_Q10, rd2_Q10;
+    opus_int32   dither, exc_Q10, LPC_exc_Q10, xq_Q10;
+    opus_int32   tmp1, tmp2, sLF_AR_shp_Q10;
+    opus_int32   *psLPC_Q14, *shp_lag_ptr, *pred_lag_ptr;
+
+    shp_lag_ptr  = &NSQ->sLTP_shp_Q10[ NSQ->sLTP_shp_buf_idx - lag + HARM_SHAPE_FIR_TAPS / 2 ];
+    pred_lag_ptr = &sLTP_Q16[ NSQ->sLTP_buf_idx - lag + LTP_ORDER / 2 ];
+
+    /* Setup short term AR state */
+    psLPC_Q14 = &NSQ->sLPC_Q14[ NSQ_LPC_BUF_LENGTH - 1 ];
+
+    for( i = 0; i < length; i++ ) {
+        /* Generate dither */
+        NSQ->rand_seed = silk_RAND( NSQ->rand_seed );
+
+        /* dither = rand_seed < 0 ? 0xFFFFFFFF : 0; */
+        dither = silk_RSHIFT( NSQ->rand_seed, 31 );
+
+        /* Short-term prediction */
+        silk_assert( ( predictLPCOrder  & 1 ) == 0 );    /* check that order is even */
+        silk_assert( ( (opus_int64)a_Q12 & 3 ) == 0 );    /* check that array starts at 4-byte aligned address */
+        silk_assert( predictLPCOrder >= 10 );            /* check that unrolling works */
+
+        /* Partially unrolled */
+        LPC_pred_Q10 = silk_SMULWB(               psLPC_Q14[  0 ], a_Q12[ 0 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -1 ], a_Q12[ 1 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -2 ], a_Q12[ 2 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -3 ], a_Q12[ 3 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -4 ], a_Q12[ 4 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -5 ], a_Q12[ 5 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -6 ], a_Q12[ 6 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -7 ], a_Q12[ 7 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -8 ], a_Q12[ 8 ] );
+        LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -9 ], a_Q12[ 9 ] );
+        for( j = 10; j < predictLPCOrder; j ++ ) {
+            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -j ], a_Q12[ j ] );
+        }
+
+        /* Long-term prediction */
+        if( signalType == TYPE_VOICED ) {
+            /* Unrolled loop */
+            LTP_pred_Q14 = silk_SMULWB(               pred_lag_ptr[  0 ], b_Q14[ 0 ] );
+            LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -1 ], b_Q14[ 1 ] );
+            LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -2 ], b_Q14[ 2 ] );
+            LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -3 ], b_Q14[ 3 ] );
+            LTP_pred_Q14 = silk_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -4 ], b_Q14[ 4 ] );
+            pred_lag_ptr++;
+        } else {
+            LTP_pred_Q14 = 0;
+        }
+
+        /* Noise shape feedback */
+        silk_assert( ( shapingLPCOrder & 1 ) == 0 );   /* check that order is even */
+        tmp2 = psLPC_Q14[ 0 ];
+        tmp1 = NSQ->sAR2_Q14[ 0 ];
+        NSQ->sAR2_Q14[ 0 ] = tmp2;
+        n_AR_Q10 = silk_SMULWB( tmp2, AR_shp_Q13[ 0 ] );
+        for( j = 2; j < shapingLPCOrder; j += 2 ) {
+            tmp2 = NSQ->sAR2_Q14[ j - 1 ];
+            NSQ->sAR2_Q14[ j - 1 ] = tmp1;
+            n_AR_Q10 = silk_SMLAWB( n_AR_Q10, tmp1, AR_shp_Q13[ j - 1 ] );
+            tmp1 = NSQ->sAR2_Q14[ j + 0 ];
+            NSQ->sAR2_Q14[ j + 0 ] = tmp2;
+            n_AR_Q10 = silk_SMLAWB( n_AR_Q10, tmp2, AR_shp_Q13[ j ] );
+        }
+        NSQ->sAR2_Q14[ shapingLPCOrder - 1 ] = tmp1;
+        n_AR_Q10 = silk_SMLAWB( n_AR_Q10, tmp1, AR_shp_Q13[ shapingLPCOrder - 1 ] );
+
+        n_AR_Q10 = silk_RSHIFT( n_AR_Q10, 1 );   /* Q11 -> Q10 */
+        n_AR_Q10 = silk_SMLAWB( n_AR_Q10, NSQ->sLF_AR_shp_Q12, Tilt_Q14 );
+
+        n_LF_Q10 = silk_LSHIFT( silk_SMULWB( NSQ->sLTP_shp_Q10[ NSQ->sLTP_shp_buf_idx - 1 ], LF_shp_Q14 ), 2 );
+        n_LF_Q10 = silk_SMLAWT( n_LF_Q10, NSQ->sLF_AR_shp_Q12, LF_shp_Q14 );
+
+        silk_assert( lag > 0 || signalType != TYPE_VOICED );
+
+        /* Long-term shaping */
+        if( lag > 0 ) {
+            /* Symmetric, packed FIR coefficients */
+            n_LTP_Q14 = silk_SMULWB( silk_ADD32( shp_lag_ptr[ 0 ], shp_lag_ptr[ -2 ] ), HarmShapeFIRPacked_Q14 );
+            n_LTP_Q14 = silk_SMLAWT( n_LTP_Q14, shp_lag_ptr[ -1 ],                     HarmShapeFIRPacked_Q14 );
+            n_LTP_Q14 = silk_LSHIFT( n_LTP_Q14, 6 );
+            shp_lag_ptr++;
+
+            tmp1 = silk_SUB32( LTP_pred_Q14, n_LTP_Q14 );                        /* Add Q14 stuff */
+            tmp1 = silk_RSHIFT( tmp1, 4 );                                       /* convert to Q10  */
+            tmp1 = silk_ADD32( tmp1, LPC_pred_Q10 );                             /* add Q10 stuff */
+            tmp1 = silk_SUB32( tmp1, n_AR_Q10 );                                 /* subtract Q10 stuff */
+        } else {
+            tmp1 = silk_SUB32( LPC_pred_Q10, n_AR_Q10 );                         /* subtract Q10 stuff */
+        }
+
+        /* Input minus prediction plus noise feedback  */
+        /*r = x[ i ] - LTP_pred - LPC_pred + n_AR + n_Tilt + n_LF + n_LTP;*/
+        tmp1  = silk_SUB32( tmp1, n_LF_Q10 );                                    /* subtract Q10 stuff */
+        r_Q10 = silk_SUB32( x_sc_Q10[ i ], tmp1 );
+
+        /* Flip sign depending on dither */
+        r_Q10 = r_Q10 ^ dither;
+        r_Q10 = silk_LIMIT_32( r_Q10, -31 << 10, 30 << 10 );
+
+        /* Find two quantization level candidates and measure their rate-distortion */
+        q1_Q10 = silk_SUB32( r_Q10, offset_Q10 );
+        q1_Q10 = silk_RSHIFT( q1_Q10, 10 );
+        if( q1_Q10 > 0 ) {
+            q1_Q10  = silk_SUB32( silk_LSHIFT( q1_Q10, 10 ), QUANT_LEVEL_ADJUST_Q10 );
+            q1_Q10  = silk_ADD32( q1_Q10, offset_Q10 );
+            q2_Q10  = silk_ADD32( q1_Q10, 1024 );
+            rd1_Q10 = silk_SMULBB( q1_Q10, Lambda_Q10 );
+            rd2_Q10 = silk_SMULBB( q2_Q10, Lambda_Q10 );
+        } else if( q1_Q10 == 0 ) {
+            q1_Q10  = offset_Q10;
+            q2_Q10  = silk_ADD32( q1_Q10, 1024 - QUANT_LEVEL_ADJUST_Q10 );
+            rd1_Q10 = silk_SMULBB( q1_Q10, Lambda_Q10 );
+            rd2_Q10 = silk_SMULBB( q2_Q10, Lambda_Q10 );
+        } else if( q1_Q10 == -1 ) {
+            q2_Q10  = offset_Q10;
+            q1_Q10  = silk_SUB32( q2_Q10, 1024 - QUANT_LEVEL_ADJUST_Q10 );
+            rd1_Q10 = silk_SMULBB( -q1_Q10, Lambda_Q10 );
+            rd2_Q10 = silk_SMULBB(  q2_Q10, Lambda_Q10 );
+        } else {            /* Q1_Q10 < -1 */
+            q1_Q10  = silk_ADD32( silk_LSHIFT( q1_Q10, 10 ), QUANT_LEVEL_ADJUST_Q10 );
+            q1_Q10  = silk_ADD32( q1_Q10, offset_Q10 );
+            q2_Q10  = silk_ADD32( q1_Q10, 1024 );
+            rd1_Q10 = silk_SMULBB( -q1_Q10, Lambda_Q10 );
+            rd2_Q10 = silk_SMULBB( -q2_Q10, Lambda_Q10 );
+        }
+        rr_Q10  = silk_SUB32( r_Q10, q1_Q10 );
+        rd1_Q10 = silk_RSHIFT( silk_SMLABB( rd1_Q10, rr_Q10, rr_Q10 ), 10 );
+        rr_Q10  = silk_SUB32( r_Q10, q2_Q10 );
+        rd2_Q10 = silk_RSHIFT( silk_SMLABB( rd2_Q10, rr_Q10, rr_Q10 ), 10 );
+
+        if( rd2_Q10 < rd1_Q10 ) {
+            q1_Q10 = q2_Q10;
+        }
+
+        pulses[ i ] = ( opus_int8 )silk_RSHIFT_ROUND( q1_Q10, 10 );
+
+        /* Excitation */
+        exc_Q10 = q1_Q10 ^ dither;
+
+        /* Add predictions */
+        LPC_exc_Q10 = silk_ADD32( exc_Q10, silk_RSHIFT_ROUND( LTP_pred_Q14, 4 ) );
+        xq_Q10      = silk_ADD32( LPC_exc_Q10, LPC_pred_Q10 );
+
+        /* Scale XQ back to normal level before saving */
+        xq[ i ] = ( opus_int16 )silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( xq_Q10, Gain_Q16 ), 10 ) );
+
+        /* Update states */
+        psLPC_Q14++;
+        *psLPC_Q14 = silk_LSHIFT( xq_Q10, 4 );
+        sLF_AR_shp_Q10 = silk_SUB32( xq_Q10, n_AR_Q10 );
+        NSQ->sLF_AR_shp_Q12 = silk_LSHIFT( sLF_AR_shp_Q10, 2 );
+
+        NSQ->sLTP_shp_Q10[ NSQ->sLTP_shp_buf_idx ] = silk_SUB32( sLF_AR_shp_Q10, n_LF_Q10 );
+        sLTP_Q16[ NSQ->sLTP_buf_idx ] = silk_LSHIFT( LPC_exc_Q10, 6 );
+        NSQ->sLTP_shp_buf_idx++;
+        NSQ->sLTP_buf_idx++;
+
+        /* Make dither dependent on quantized signal */
+        NSQ->rand_seed = silk_ADD32_ovflw(NSQ->rand_seed, pulses[ i ]);
+    }
+
+    /* Update LPC synth buffer */
+    silk_memcpy( NSQ->sLPC_Q14, &NSQ->sLPC_Q14[ length ], NSQ_LPC_BUF_LENGTH * sizeof( opus_int32 ) );
+}
+
+static inline void silk_nsq_scale_states(
+    const silk_encoder_state *psEncC,       /* I    Encoder State                   */
+    silk_nsq_state      *NSQ,               /* I/O  NSQ state                       */
+    const opus_int16     x[],                /* I    input in Q0                     */
+    opus_int32           x_sc_Q10[],         /* O    input scaled with 1/Gain        */
+    const opus_int16     sLTP[],             /* I    re-whitened LTP state in Q0     */
+    opus_int32           sLTP_Q16[],         /* O    LTP state matching scaled input */
+    opus_int             subfr,              /* I    subframe number                 */
+    const opus_int       LTP_scale_Q14,      /* I                                    */
+    const opus_int32     Gains_Q16[ MAX_NB_SUBFR ], /* I                             */
+    const opus_int       pitchL[ MAX_NB_SUBFR ]  /* I                                */
+)
+{
+    opus_int   i, lag;
+    opus_int32 inv_gain_Q16, gain_adj_Q16, inv_gain_Q32;
+
+    inv_gain_Q16 = silk_INVERSE32_varQ( silk_max( Gains_Q16[ subfr ], 1 ), 32 );
+    inv_gain_Q16 = silk_min( inv_gain_Q16, silk_int16_MAX );
+    lag          = pitchL[ subfr ];
+
+    /* After rewhitening the LTP state is un-scaled, so scale with inv_gain_Q16 */
+    if( NSQ->rewhite_flag ) {
+        inv_gain_Q32 = silk_LSHIFT( inv_gain_Q16, 16 );
+        if( subfr == 0 ) {
+            /* Do LTP downscaling */
+            inv_gain_Q32 = silk_LSHIFT( silk_SMULWB( inv_gain_Q32, LTP_scale_Q14 ), 2 );
+        }
+        for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx; i++ ) {
+            silk_assert( i < MAX_FRAME_LENGTH );
+            sLTP_Q16[ i ] = silk_SMULWB( inv_gain_Q32, sLTP[ i ] );
+        }
+    }
+
+    /* Adjust for changing gain */
+    if( inv_gain_Q16 != NSQ->prev_inv_gain_Q16 ) {
+        gain_adj_Q16 = silk_DIV32_varQ( inv_gain_Q16, NSQ->prev_inv_gain_Q16, 16 );
+
+        /* Scale long-term shaping state */
+        for( i = NSQ->sLTP_shp_buf_idx - psEncC->ltp_mem_length; i < NSQ->sLTP_shp_buf_idx; i++ ) {
+            NSQ->sLTP_shp_Q10[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sLTP_shp_Q10[ i ] );
+        }
+
+        /* Scale long-term prediction state */
+        if( NSQ->rewhite_flag == 0 ) {
+            for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx; i++ ) {
+                sLTP_Q16[ i ] = silk_SMULWW( gain_adj_Q16, sLTP_Q16[ i ] );
+            }
+        }
+
+        NSQ->sLF_AR_shp_Q12 = silk_SMULWW( gain_adj_Q16, NSQ->sLF_AR_shp_Q12 );
+
+        /* Scale short-term prediction and shaping states */
+        for( i = 0; i < NSQ_LPC_BUF_LENGTH; i++ ) {
+            NSQ->sLPC_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sLPC_Q14[ i ] );
+        }
+        for( i = 0; i < MAX_SHAPE_LPC_ORDER; i++ ) {
+            NSQ->sAR2_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sAR2_Q14[ i ] );
+        }
+    }
+
+    /* Scale input */
+    for( i = 0; i < psEncC->subfr_length; i++ ) {
+        x_sc_Q10[ i ] = silk_RSHIFT( silk_SMULBB( x[ i ], ( opus_int16 )inv_gain_Q16 ), 6 );
+    }
+
+    /* save inv_gain */
+    silk_assert( inv_gain_Q16 != 0 );
+    NSQ->prev_inv_gain_Q16 = inv_gain_Q16;
+}