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

1 files changed, 684 insertions, 0 deletions

diff --git a/silk/NSQ_del_dec.c b/silk/NSQ_del_dec.c
new file mode 100644
index 00000000..1cb55b65
--- /dev/null
+++ b/silk/NSQ_del_dec.c
@@ -0,0 +1,684 @@
+/***********************************************************************
+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"
+
+typedef struct {
+    opus_int32 sLPC_Q14[ MAX_FRAME_LENGTH / MAX_NB_SUBFR + NSQ_LPC_BUF_LENGTH ];
+    opus_int32 RandState[ DECISION_DELAY ];
+    opus_int32 Q_Q10[     DECISION_DELAY ];
+    opus_int32 Xq_Q10[    DECISION_DELAY ];
+    opus_int32 Pred_Q16[  DECISION_DELAY ];
+    opus_int32 Shape_Q10[ DECISION_DELAY ];
+    opus_int32 sAR2_Q14[ MAX_SHAPE_LPC_ORDER ];
+    opus_int32 LF_AR_Q12;
+    opus_int32 Seed;
+    opus_int32 SeedInit;
+    opus_int32 RD_Q10;
+} NSQ_del_dec_struct;
+
+typedef struct {
+    opus_int32 Q_Q10;
+    opus_int32 RD_Q10;
+    opus_int32 xq_Q14;
+    opus_int32 LF_AR_Q12;
+    opus_int32 sLTP_shp_Q10;
+    opus_int32 LPC_exc_Q16;
+} NSQ_sample_struct;
+
+static inline void silk_nsq_del_dec_scale_states(
+    const silk_encoder_state *psEncC,               /* I    Encoder State                       */
+    silk_nsq_state      *NSQ,                       /* I/O  NSQ state                           */
+    NSQ_del_dec_struct  psDelDec[],                 /* I/O  Delayed decision states             */
+    const opus_int16     x[],                        /* I    Input in Q0                         */
+    opus_int32           x_sc_Q10[],                 /* O    Input scaled with 1/Gain in Q10     */
+    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                     */
+    opus_int             nStatesDelayedDecision,     /* I    Number of del dec states            */
+    opus_int             smpl_buf_idx,               /* I    Index to newest samples in buffers  */
+    const opus_int       LTP_scale_Q14,              /* I    LTP state scaling                   */
+    const opus_int32     Gains_Q16[ MAX_NB_SUBFR ],  /* I                                        */
+    const opus_int       pitchL[ MAX_NB_SUBFR ]      /* I    Pitch lag                           */
+);
+
+/******************************************/
+/* Noise shape quantizer for one subframe */
+/******************************************/
+static inline void silk_noise_shape_quantizer_del_dec(
+    silk_nsq_state      *NSQ,                   /* I/O  NSQ state                           */
+    NSQ_del_dec_struct  psDelDec[],             /* I/O  Delayed decision states             */
+    opus_int             signalType,             /* I    Signal type                         */
+    const opus_int32     x_Q10[],                /* I                                        */
+    opus_int8            pulses[],               /* O                                        */
+    opus_int16           xq[],                   /* O                                        */
+    opus_int32           sLTP_Q16[],             /* I/O  LTP filter state                    */
+    opus_int32           delayedGain_Q16[],      /* I/O  Gain delay buffer                   */
+    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 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             subfr,                  /* I    Subframe number                     */
+    opus_int             shapingLPCOrder,        /* I    Shaping LPC filter order            */
+    opus_int             predictLPCOrder,        /* I    Prediction filter order             */
+    opus_int             warping_Q16,            /* I                                        */
+    opus_int             nStatesDelayedDecision, /* I    Number of states in decision tree   */
+    opus_int             *smpl_buf_idx,          /* I    Index to newest samples in buffers  */
+    opus_int             decisionDelay           /* I                                        */
+);
+
+void silk_NSQ_del_dec(
+    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 pulse signal              */
+    const opus_int16                 PredCoef_Q12[ 2 * MAX_LPC_ORDER ],          /* I    Prediction coefs                    */
+    const opus_int16                 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ],    /* I    LT prediction coefs                 */
+    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     i, k, lag, start_idx, LSF_interpolation_flag, Winner_ind, subfr;
+    opus_int     last_smple_idx, smpl_buf_idx, decisionDelay;
+    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   RDmin_Q10;
+    opus_int32   x_sc_Q10[ MAX_SUB_FRAME_LENGTH ];
+    opus_int32   delayedGain_Q16[  DECISION_DELAY ];
+    NSQ_del_dec_struct psDelDec[ MAX_DEL_DEC_STATES ];
+    NSQ_del_dec_struct *psDD;
+
+    /* Set unvoiced lag to the previous one, overwrite later for voiced */
+    lag = NSQ->lagPrev;
+
+    silk_assert( NSQ->prev_inv_gain_Q16 != 0 );
+
+    /* Initialize delayed decision states */
+    silk_memset( psDelDec, 0, psEncC->nStatesDelayedDecision * sizeof( NSQ_del_dec_struct ) );
+    for( k = 0; k < psEncC->nStatesDelayedDecision; k++ ) {
+        psDD                 = &psDelDec[ k ];
+        psDD->Seed           = ( k + psIndices->Seed ) & 3;
+        psDD->SeedInit       = psDD->Seed;
+        psDD->RD_Q10         = 0;
+        psDD->LF_AR_Q12      = NSQ->sLF_AR_shp_Q12;
+        psDD->Shape_Q10[ 0 ] = NSQ->sLTP_shp_Q10[ psEncC->ltp_mem_length - 1 ];
+        silk_memcpy( psDD->sLPC_Q14, NSQ->sLPC_Q14, NSQ_LPC_BUF_LENGTH * sizeof( opus_int32 ) );
+        silk_memcpy( psDD->sAR2_Q14, NSQ->sAR2_Q14, sizeof( NSQ->sAR2_Q14 ) );
+    }
+
+    offset_Q10   = silk_Quantization_Offsets_Q10[ psIndices->signalType >> 1 ][ psIndices->quantOffsetType ];
+    smpl_buf_idx = 0; /* index of oldest samples */
+
+    decisionDelay = silk_min_int( DECISION_DELAY, psEncC->subfr_length );
+
+    /* For voiced frames limit the decision delay to lower than the pitch lag */
+    if( psIndices->signalType == TYPE_VOICED ) {
+        for( k = 0; k < psEncC->nb_subfr; k++ ) {
+            decisionDelay = silk_min_int( decisionDelay, pitchL[ k ] - LTP_ORDER / 2 - 1 );
+        }
+    } else {
+        if( lag > 0 ) {
+            decisionDelay = silk_min_int( decisionDelay, lag - LTP_ORDER / 2 - 1 );
+        }
+    }
+
+    if( psIndices->NLSFInterpCoef_Q2 == 4 ) {
+        LSF_interpolation_flag = 0;
+    } else {
+        LSF_interpolation_flag = 1;
+    }
+
+    /* Setup pointers to start of sub frame */
+    pxq                   = &NSQ->xq[ psEncC->ltp_mem_length ];
+    NSQ->sLTP_shp_buf_idx = psEncC->ltp_mem_length;
+    NSQ->sLTP_buf_idx     = psEncC->ltp_mem_length;
+    subfr = 0;
+    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 ) {
+                if( k == 2 ) {
+                    /* RESET DELAYED DECISIONS */
+                    /* Find winner */
+                    RDmin_Q10 = psDelDec[ 0 ].RD_Q10;
+                    Winner_ind = 0;
+                    for( i = 1; i < psEncC->nStatesDelayedDecision; i++ ) {
+                        if( psDelDec[ i ].RD_Q10 < RDmin_Q10 ) {
+                            RDmin_Q10 = psDelDec[ i ].RD_Q10;
+                            Winner_ind = i;
+                        }
+                    }
+                    for( i = 0; i < psEncC->nStatesDelayedDecision; i++ ) {
+                        if( i != Winner_ind ) {
+                            psDelDec[ i ].RD_Q10 += ( silk_int32_MAX >> 4 );
+                            silk_assert( psDelDec[ i ].RD_Q10 >= 0 );
+                        }
+                    }
+
+                    /* Copy final part of signals from winner state to output and long-term filter states */
+                    psDD = &psDelDec[ Winner_ind ];
+                    last_smple_idx = smpl_buf_idx + decisionDelay;
+                    for( i = 0; i < decisionDelay; i++ ) {
+                        last_smple_idx = ( last_smple_idx - 1 ) & DECISION_DELAY_MASK;
+                        pulses[   i - decisionDelay ] = ( opus_int8 )silk_RSHIFT_ROUND( psDD->Q_Q10[ last_smple_idx ], 10 );
+                        pxq[ i - decisionDelay ] = ( opus_int16 )silk_SAT16( silk_RSHIFT_ROUND(
+                            silk_SMULWW( psDD->Xq_Q10[ last_smple_idx ], Gains_Q16[ 1 ] ), 10 ) );
+                        NSQ->sLTP_shp_Q10[ NSQ->sLTP_shp_buf_idx - decisionDelay + i ] = psDD->Shape_Q10[ last_smple_idx ];
+                    }
+
+                    subfr = 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->sLTP_buf_idx = psEncC->ltp_mem_length;
+                NSQ->rewhite_flag = 1;
+            }
+        }
+
+        silk_nsq_del_dec_scale_states( psEncC, NSQ, psDelDec, x, x_sc_Q10, sLTP, sLTP_Q16, k,
+            psEncC->nStatesDelayedDecision, smpl_buf_idx, LTP_scale_Q14, Gains_Q16, pitchL );
+
+        silk_noise_shape_quantizer_del_dec( NSQ, psDelDec, psIndices->signalType, x_sc_Q10, pulses, pxq, sLTP_Q16,
+            delayedGain_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, subfr++, psEncC->shapingLPCOrder,
+            psEncC->predictLPCOrder, psEncC->warping_Q16, psEncC->nStatesDelayedDecision, &smpl_buf_idx, decisionDelay );
+
+        x      += psEncC->subfr_length;
+        pulses += psEncC->subfr_length;
+        pxq    += psEncC->subfr_length;
+    }
+
+    /* Find winner */
+    RDmin_Q10 = psDelDec[ 0 ].RD_Q10;
+    Winner_ind = 0;
+    for( k = 1; k < psEncC->nStatesDelayedDecision; k++ ) {
+        if( psDelDec[ k ].RD_Q10 < RDmin_Q10 ) {
+            RDmin_Q10 = psDelDec[ k ].RD_Q10;
+            Winner_ind = k;
+        }
+    }
+
+    /* Copy final part of signals from winner state to output and long-term filter states */
+    psDD = &psDelDec[ Winner_ind ];
+    psIndices->Seed = psDD->SeedInit;
+    last_smple_idx = smpl_buf_idx + decisionDelay;
+    for( i = 0; i < decisionDelay; i++ ) {
+        last_smple_idx = ( last_smple_idx - 1 ) & DECISION_DELAY_MASK;
+        pulses[   i - decisionDelay ] = ( opus_int8 )silk_RSHIFT_ROUND( psDD->Q_Q10[ last_smple_idx ], 10 );
+        pxq[ i - decisionDelay ] = ( opus_int16 )silk_SAT16( silk_RSHIFT_ROUND(
+            silk_SMULWW( psDD->Xq_Q10[ last_smple_idx ], Gains_Q16[ psEncC->nb_subfr - 1 ] ), 10 ) );
+        NSQ->sLTP_shp_Q10[ NSQ->sLTP_shp_buf_idx - decisionDelay + i ] = psDD->Shape_Q10[ last_smple_idx ];
+        sLTP_Q16[          NSQ->sLTP_buf_idx     - decisionDelay + i ] = psDD->Pred_Q16[  last_smple_idx ];
+    }
+    silk_memcpy( NSQ->sLPC_Q14, &psDD->sLPC_Q14[ psEncC->subfr_length ], NSQ_LPC_BUF_LENGTH * sizeof( opus_int32 ) );
+    silk_memcpy( NSQ->sAR2_Q14, psDD->sAR2_Q14, sizeof( psDD->sAR2_Q14 ) );
+
+    /* Update states */
+    NSQ->sLF_AR_shp_Q12 = psDD->LF_AR_Q12;
+    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
+}
+
+/******************************************/
+/* Noise shape quantizer for one subframe */
+/******************************************/
+static inline void silk_noise_shape_quantizer_del_dec(
+    silk_nsq_state  *NSQ,                   /* I/O  NSQ state                           */
+    NSQ_del_dec_struct  psDelDec[],             /* I/O  Delayed decision states             */
+    opus_int             signalType,             /* I    Signal type                         */
+    const opus_int32     x_Q10[],                /* I                                        */
+    opus_int8            pulses[],               /* O                                        */
+    opus_int16           xq[],                   /* O                                        */
+    opus_int32           sLTP_Q16[],             /* I/O  LTP filter state                    */
+    opus_int32           delayedGain_Q16[],      /* I/O  Gain delay buffer                   */
+    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 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             subfr,                  /* I    Subframe number                     */
+    opus_int             shapingLPCOrder,        /* I    Shaping LPC filter order            */
+    opus_int             predictLPCOrder,        /* I    Prediction filter order             */
+    opus_int             warping_Q16,            /* I                                        */
+    opus_int             nStatesDelayedDecision, /* I    Number of states in decision tree   */
+    opus_int             *smpl_buf_idx,          /* I    Index to newest samples in buffers  */
+    opus_int             decisionDelay           /* I                                        */
+)
+{
+    opus_int     i, j, k, Winner_ind, RDmin_ind, RDmax_ind, last_smple_idx;
+    opus_int32   Winner_rand_state;
+    opus_int32   LTP_pred_Q14, LPC_pred_Q10, n_AR_Q10, n_LTP_Q14, LTP_Q10;
+    opus_int32   n_LF_Q10, r_Q10, rr_Q10, rd1_Q10, rd2_Q10, RDmin_Q10, RDmax_Q10;
+    opus_int32   q1_Q10, q2_Q10, dither, exc_Q10, LPC_exc_Q10, xq_Q10;
+    opus_int32   tmp1, tmp2, sLF_AR_shp_Q10;
+    opus_int32   *pred_lag_ptr, *shp_lag_ptr, *psLPC_Q14;
+    NSQ_sample_struct  psSampleState[ MAX_DEL_DEC_STATES ][ 2 ];
+    NSQ_del_dec_struct *psDD;
+    NSQ_sample_struct  *psSS;
+
+    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 ];
+
+    for( i = 0; i < length; i++ ) {
+        /* Perform common calculations used in all states */
+
+        /* 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;
+        }
+
+        /* 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++;
+
+            LTP_Q10 = silk_RSHIFT( silk_SUB32( LTP_pred_Q14, n_LTP_Q14 ), 4 );
+        } else {
+            LTP_Q10 = 0;
+        }
+
+        for( k = 0; k < nStatesDelayedDecision; k++ ) {
+            /* Delayed decision state */
+            psDD = &psDelDec[ k ];
+
+            /* Sample state */
+            psSS = psSampleState[ k ];
+
+            /* Generate dither */
+            psDD->Seed = silk_RAND( psDD->Seed );
+
+            /* dither = rand_seed < 0 ? 0xFFFFFFFF : 0; */
+            dither = silk_RSHIFT( psDD->Seed, 31 );
+
+            /* Pointer used in short term prediction and shaping */
+            psLPC_Q14 = &psDD->sLPC_Q14[ NSQ_LPC_BUF_LENGTH - 1 + i ];
+            /* Short-term prediction */
+            silk_assert( predictLPCOrder >= 10 );            /* check that unrolling works */
+            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 */
+            /* 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 ] );
+            }
+
+            /* Noise shape feedback */
+            silk_assert( ( shapingLPCOrder & 1 ) == 0 );   /* check that order is even */
+            /* Output of lowpass section */
+            tmp2 = silk_SMLAWB( psLPC_Q14[ 0 ], psDD->sAR2_Q14[ 0 ], warping_Q16 );
+            /* Output of allpass section */
+            tmp1 = silk_SMLAWB( psDD->sAR2_Q14[ 0 ], psDD->sAR2_Q14[ 1 ] - tmp2, warping_Q16 );
+            psDD->sAR2_Q14[ 0 ] = tmp2;
+            n_AR_Q10 = silk_SMULWB( tmp2, AR_shp_Q13[ 0 ] );
+            /* Loop over allpass sections */
+            for( j = 2; j < shapingLPCOrder; j += 2 ) {
+                /* Output of allpass section */
+                tmp2 = silk_SMLAWB( psDD->sAR2_Q14[ j - 1 ], psDD->sAR2_Q14[ j + 0 ] - tmp1, warping_Q16 );
+                psDD->sAR2_Q14[ j - 1 ] = tmp1;
+                n_AR_Q10 = silk_SMLAWB( n_AR_Q10, tmp1, AR_shp_Q13[ j - 1 ] );
+                /* Output of allpass section */
+                tmp1 = silk_SMLAWB( psDD->sAR2_Q14[ j + 0 ], psDD->sAR2_Q14[ j + 1 ] - tmp2, warping_Q16 );
+                psDD->sAR2_Q14[ j + 0 ] = tmp2;
+                n_AR_Q10 = silk_SMLAWB( n_AR_Q10, tmp2, AR_shp_Q13[ j ] );
+            }
+            psDD->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, psDD->LF_AR_Q12, Tilt_Q14 );
+
+            n_LF_Q10 = silk_LSHIFT( silk_SMULWB( psDD->Shape_Q10[ *smpl_buf_idx ], LF_shp_Q14 ), 2 );
+            n_LF_Q10 = silk_SMLAWT( n_LF_Q10, psDD->LF_AR_Q12, LF_shp_Q14 );
+
+            /* Input minus prediction plus noise feedback                       */
+            /* r = x[ i ] - LTP_pred - LPC_pred + n_AR + n_Tilt + n_LF + n_LTP  */
+            tmp1  = silk_ADD32( LTP_Q10, LPC_pred_Q10 );                         /* add Q10 stuff */
+            tmp1  = silk_SUB32( tmp1, n_AR_Q10 );                                /* subtract Q10 stuff */
+            tmp1  = silk_SUB32( tmp1, n_LF_Q10 );                                /* subtract Q10 stuff */
+            r_Q10 = silk_SUB32( x_Q10[ i ], tmp1 );                              /* residual error Q10 */
+
+            /* 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( rd1_Q10 < rd2_Q10 ) {
+                psSS[ 0 ].RD_Q10 = silk_ADD32( psDD->RD_Q10, rd1_Q10 );
+                psSS[ 1 ].RD_Q10 = silk_ADD32( psDD->RD_Q10, rd2_Q10 );
+                psSS[ 0 ].Q_Q10  = q1_Q10;
+                psSS[ 1 ].Q_Q10  = q2_Q10;
+            } else {
+                psSS[ 0 ].RD_Q10 = silk_ADD32( psDD->RD_Q10, rd2_Q10 );
+                psSS[ 1 ].RD_Q10 = silk_ADD32( psDD->RD_Q10, rd1_Q10 );
+                psSS[ 0 ].Q_Q10  = q2_Q10;
+                psSS[ 1 ].Q_Q10  = q1_Q10;
+            }
+
+            /* Update states for best quantization */
+
+            /* Quantized excitation */
+            exc_Q10 = psSS[ 0 ].Q_Q10 ^ dither;
+
+            /* Add predictions */
+            LPC_exc_Q10 = exc_Q10 + silk_RSHIFT_ROUND( LTP_pred_Q14, 4 );
+            xq_Q10      = silk_ADD32( LPC_exc_Q10, LPC_pred_Q10 );
+
+            /* Update states */
+            sLF_AR_shp_Q10         = silk_SUB32(  xq_Q10, n_AR_Q10 );
+            psSS[ 0 ].sLTP_shp_Q10 = silk_SUB32(  sLF_AR_shp_Q10, n_LF_Q10 );
+            psSS[ 0 ].LF_AR_Q12    = silk_LSHIFT( sLF_AR_shp_Q10, 2 );
+            psSS[ 0 ].xq_Q14       = silk_LSHIFT( xq_Q10,         4 );
+            psSS[ 0 ].LPC_exc_Q16  = silk_LSHIFT( LPC_exc_Q10,    6 );
+
+            /* Update states for second best quantization */
+
+            /* Quantized excitation */
+            exc_Q10 = psSS[ 1 ].Q_Q10 ^ dither;
+
+            /* Add predictions */
+            LPC_exc_Q10 = exc_Q10 + silk_RSHIFT_ROUND( LTP_pred_Q14, 4 );
+            xq_Q10      = silk_ADD32( LPC_exc_Q10, LPC_pred_Q10 );
+
+            /* Update states */
+            sLF_AR_shp_Q10         = silk_SUB32(  xq_Q10, n_AR_Q10 );
+            psSS[ 1 ].sLTP_shp_Q10 = silk_SUB32(  sLF_AR_shp_Q10, n_LF_Q10 );
+            psSS[ 1 ].LF_AR_Q12    = silk_LSHIFT( sLF_AR_shp_Q10, 2 );
+            psSS[ 1 ].xq_Q14       = silk_LSHIFT( xq_Q10,         4 );
+            psSS[ 1 ].LPC_exc_Q16  = silk_LSHIFT( LPC_exc_Q10,    6 );
+        }
+
+        *smpl_buf_idx  = ( *smpl_buf_idx - 1 ) & DECISION_DELAY_MASK;                   /* Index to newest samples              */
+        last_smple_idx = ( *smpl_buf_idx + decisionDelay ) & DECISION_DELAY_MASK;       /* Index to decisionDelay old samples   */
+
+        /* Find winner */
+        RDmin_Q10 = psSampleState[ 0 ][ 0 ].RD_Q10;
+        Winner_ind = 0;
+        for( k = 1; k < nStatesDelayedDecision; k++ ) {
+            if( psSampleState[ k ][ 0 ].RD_Q10 < RDmin_Q10 ) {
+                RDmin_Q10  = psSampleState[ k ][ 0 ].RD_Q10;
+                Winner_ind = k;
+            }
+        }
+
+        /* Increase RD values of expired states */
+        Winner_rand_state = psDelDec[ Winner_ind ].RandState[ last_smple_idx ];
+        for( k = 0; k < nStatesDelayedDecision; k++ ) {
+            if( psDelDec[ k ].RandState[ last_smple_idx ] != Winner_rand_state ) {
+                psSampleState[ k ][ 0 ].RD_Q10 = silk_ADD32( psSampleState[ k ][ 0 ].RD_Q10, ( silk_int32_MAX >> 4 ) );
+                psSampleState[ k ][ 1 ].RD_Q10 = silk_ADD32( psSampleState[ k ][ 1 ].RD_Q10, ( silk_int32_MAX >> 4 ) );
+                silk_assert( psSampleState[ k ][ 0 ].RD_Q10 >= 0 );
+            }
+        }
+
+        /* Find worst in first set and best in second set */
+        RDmax_Q10  = psSampleState[ 0 ][ 0 ].RD_Q10;
+        RDmin_Q10  = psSampleState[ 0 ][ 1 ].RD_Q10;
+        RDmax_ind = 0;
+        RDmin_ind = 0;
+        for( k = 1; k < nStatesDelayedDecision; k++ ) {
+            /* find worst in first set */
+            if( psSampleState[ k ][ 0 ].RD_Q10 > RDmax_Q10 ) {
+                RDmax_Q10  = psSampleState[ k ][ 0 ].RD_Q10;
+                RDmax_ind = k;
+            }
+            /* find best in second set */
+            if( psSampleState[ k ][ 1 ].RD_Q10 < RDmin_Q10 ) {
+                RDmin_Q10  = psSampleState[ k ][ 1 ].RD_Q10;
+                RDmin_ind = k;
+            }
+        }
+
+        /* Replace a state if best from second set outperforms worst in first set */
+        if( RDmin_Q10 < RDmax_Q10 ) {
+            silk_memcpy( ((opus_int32 *)&psDelDec[ RDmax_ind ]) + i,
+                        ((opus_int32 *)&psDelDec[ RDmin_ind ]) + i, sizeof( NSQ_del_dec_struct ) - i * sizeof( opus_int32) );
+            silk_memcpy( &psSampleState[ RDmax_ind ][ 0 ], &psSampleState[ RDmin_ind ][ 1 ], sizeof( NSQ_sample_struct ) );
+        }
+
+        /* Write samples from winner to output and long-term filter states */
+        psDD = &psDelDec[ Winner_ind ];
+        if( subfr > 0 || i >= decisionDelay ) {
+            pulses[  i - decisionDelay ] = ( opus_int8 )silk_RSHIFT_ROUND( psDD->Q_Q10[ last_smple_idx ], 10 );
+            xq[ i - decisionDelay ] = ( opus_int16 )silk_SAT16( silk_RSHIFT_ROUND(
+                silk_SMULWW( psDD->Xq_Q10[ last_smple_idx ], delayedGain_Q16[ last_smple_idx ] ), 10 ) );
+            NSQ->sLTP_shp_Q10[ NSQ->sLTP_shp_buf_idx - decisionDelay ] = psDD->Shape_Q10[ last_smple_idx ];
+            sLTP_Q16[          NSQ->sLTP_buf_idx     - decisionDelay ] = psDD->Pred_Q16[  last_smple_idx ];
+        }
+        NSQ->sLTP_shp_buf_idx++;
+        NSQ->sLTP_buf_idx++;
+
+        /* Update states */
+        for( k = 0; k < nStatesDelayedDecision; k++ ) {
+            psDD                                     = &psDelDec[ k ];
+            psSS                                     = &psSampleState[ k ][ 0 ];
+            psDD->LF_AR_Q12                          = psSS->LF_AR_Q12;
+            psDD->sLPC_Q14[ NSQ_LPC_BUF_LENGTH + i ] = psSS->xq_Q14;
+            psDD->Xq_Q10[    *smpl_buf_idx ]         = silk_RSHIFT( psSS->xq_Q14, 4 );
+            psDD->Q_Q10[     *smpl_buf_idx ]         = psSS->Q_Q10;
+            psDD->Pred_Q16[  *smpl_buf_idx ]         = psSS->LPC_exc_Q16;
+            psDD->Shape_Q10[ *smpl_buf_idx ]         = psSS->sLTP_shp_Q10;
+            psDD->Seed                               = silk_ADD32( psDD->Seed, silk_RSHIFT_ROUND( psSS->Q_Q10, 10 ) );
+            psDD->RandState[ *smpl_buf_idx ]         = psDD->Seed;
+            psDD->RD_Q10                             = psSS->RD_Q10;
+        }
+        delayedGain_Q16[     *smpl_buf_idx ]         = Gain_Q16;
+    }
+    /* Update LPC states */
+    for( k = 0; k < nStatesDelayedDecision; k++ ) {
+        psDD = &psDelDec[ k ];
+        silk_memcpy( psDD->sLPC_Q14, &psDD->sLPC_Q14[ length ], NSQ_LPC_BUF_LENGTH * sizeof( opus_int32 ) );
+    }
+}
+
+static inline void silk_nsq_del_dec_scale_states(
+    const silk_encoder_state *psEncC,               /* I    Encoder State                       */
+    silk_nsq_state      *NSQ,                       /* I/O  NSQ state                           */
+    NSQ_del_dec_struct  psDelDec[],                 /* I/O  Delayed decision states             */
+    const opus_int16     x[],                        /* I    Input in Q0                         */
+    opus_int32           x_sc_Q10[],                 /* O    Input scaled with 1/Gain in Q10     */
+    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                     */
+    opus_int             nStatesDelayedDecision,     /* I    Number of del dec states            */
+    opus_int             smpl_buf_idx,               /* I    Index to newest samples in buffers  */
+    const opus_int       LTP_scale_Q14,              /* I    LTP state scaling                   */
+    const opus_int32     Gains_Q16[ MAX_NB_SUBFR ],  /* I                                        */
+    const opus_int       pitchL[ MAX_NB_SUBFR ]      /* I    Pitch lag                           */
+)
+{
+    opus_int            i, k, lag;
+    opus_int32          inv_gain_Q16, gain_adj_Q16, inv_gain_Q32;
+    NSQ_del_dec_struct *psDD;
+
+    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 ] );
+            }
+        }
+
+        for( k = 0; k < nStatesDelayedDecision; k++ ) {
+            psDD = &psDelDec[ k ];
+
+            /* Scale scalar states */
+            psDD->LF_AR_Q12 = silk_SMULWW( gain_adj_Q16, psDD->LF_AR_Q12 );
+
+            /* Scale short-term prediction and shaping states */
+            for( i = 0; i < NSQ_LPC_BUF_LENGTH; i++ ) {
+                psDD->sLPC_Q14[ i ] = silk_SMULWW( gain_adj_Q16, psDD->sLPC_Q14[ i ] );
+            }
+            for( i = 0; i < MAX_SHAPE_LPC_ORDER; i++ ) {
+                psDD->sAR2_Q14[ i ] = silk_SMULWW( gain_adj_Q16, psDD->sAR2_Q14[ i ] );
+            }
+            for( i = 0; i < DECISION_DELAY; i++ ) {
+                psDD->Pred_Q16[  i ] = silk_SMULWW( gain_adj_Q16, psDD->Pred_Q16[  i ] );
+                psDD->Shape_Q10[ i ] = silk_SMULWW( gain_adj_Q16, psDD->Shape_Q10[ 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;
+}