diff --git a/jni/libopus/silk/NLSF_encode.c b/jni/libopus/silk/NLSF_encode.c
new file mode 100644
index 0000000..52a263d
--- /dev/null
+++ b/jni/libopus/silk/NLSF_encode.c
@@ -0,0 +1,128 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, 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 Internet Society, IETF or IETF Trust, nor the 
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+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"
+
+/***********************/
+/* NLSF vector encoder */
+/***********************/
+opus_int32 silk_NLSF_encode(                                    /* O    Returns RD value in Q25                     */
+          opus_int8             *NLSFIndices,                   /* I    Codebook path vector [ LPC_ORDER + 1 ]      */
+          opus_int16            *pNLSF_Q15,                     /* I/O  Quantized NLSF vector [ LPC_ORDER ]         */
+    const silk_NLSF_CB_struct   *psNLSF_CB,                     /* I    Codebook object                             */
+    const opus_int16            *pW_QW,                         /* I    NLSF weight vector [ LPC_ORDER ]            */
+    const opus_int              NLSF_mu_Q20,                    /* I    Rate weight for the RD optimization         */
+    const opus_int              nSurvivors,                     /* I    Max survivors after first stage             */
+    const opus_int              signalType                      /* I    Signal type: 0/1/2                          */
+)
+{
+    opus_int         i, s, ind1, bestIndex, prob_Q8, bits_q7;
+    opus_int32       W_tmp_Q9;
+    opus_int32       err_Q26[      NLSF_VQ_MAX_VECTORS ];
+    opus_int32       RD_Q25[       NLSF_VQ_MAX_SURVIVORS ];
+    opus_int         tempIndices1[ NLSF_VQ_MAX_SURVIVORS ];
+    opus_int8        tempIndices2[ NLSF_VQ_MAX_SURVIVORS * MAX_LPC_ORDER ];
+    opus_int16       res_Q15[      MAX_LPC_ORDER ];
+    opus_int16       res_Q10[      MAX_LPC_ORDER ];
+    opus_int16       NLSF_tmp_Q15[ MAX_LPC_ORDER ];
+    opus_int16       W_tmp_QW[     MAX_LPC_ORDER ];
+    opus_int16       W_adj_Q5[     MAX_LPC_ORDER ];
+    opus_uint8       pred_Q8[      MAX_LPC_ORDER ];
+    opus_int16       ec_ix[        MAX_LPC_ORDER ];
+    const opus_uint8 *pCB_element, *iCDF_ptr;
+
+    silk_assert( nSurvivors <= NLSF_VQ_MAX_SURVIVORS );
+    silk_assert( signalType >= 0 && signalType <= 2 );
+    silk_assert( NLSF_mu_Q20 <= 32767 && NLSF_mu_Q20 >= 0 );
+
+    /* NLSF stabilization */
+    silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->deltaMin_Q15, psNLSF_CB->order );
+
+    /* First stage: VQ */
+    silk_NLSF_VQ( err_Q26, pNLSF_Q15, psNLSF_CB->CB1_NLSF_Q8, psNLSF_CB->nVectors, psNLSF_CB->order );
+
+    /* Sort the quantization errors */
+    silk_insertion_sort_increasing( err_Q26, tempIndices1, psNLSF_CB->nVectors, nSurvivors );
+
+    /* Loop over survivors */
+    for( s = 0; s < nSurvivors; s++ ) {
+        ind1 = tempIndices1[ s ];
+
+        /* Residual after first stage */
+        pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ ind1 * psNLSF_CB->order ];
+        for( i = 0; i < psNLSF_CB->order; i++ ) {
+            NLSF_tmp_Q15[ i ] = silk_LSHIFT16( (opus_int16)pCB_element[ i ], 7 );
+            res_Q15[ i ] = pNLSF_Q15[ i ] - NLSF_tmp_Q15[ i ];
+        }
+
+        /* Weights from codebook vector */
+        silk_NLSF_VQ_weights_laroia( W_tmp_QW, NLSF_tmp_Q15, psNLSF_CB->order );
+
+        /* Apply square-rooted weights */
+        for( i = 0; i < psNLSF_CB->order; i++ ) {
+            W_tmp_Q9 = silk_SQRT_APPROX( silk_LSHIFT( (opus_int32)W_tmp_QW[ i ], 18 - NLSF_W_Q ) );
+            res_Q10[ i ] = (opus_int16)silk_RSHIFT( silk_SMULBB( res_Q15[ i ], W_tmp_Q9 ), 14 );
+        }
+
+        /* Modify input weights accordingly */
+        for( i = 0; i < psNLSF_CB->order; i++ ) {
+            W_adj_Q5[ i ] = silk_DIV32_16( silk_LSHIFT( (opus_int32)pW_QW[ i ], 5 ), W_tmp_QW[ i ] );
+        }
+
+        /* Unpack entropy table indices and predictor for current CB1 index */
+        silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, ind1 );
+
+        /* Trellis quantizer */
+        RD_Q25[ s ] = silk_NLSF_del_dec_quant( &tempIndices2[ s * MAX_LPC_ORDER ], res_Q10, W_adj_Q5, pred_Q8, ec_ix,
+            psNLSF_CB->ec_Rates_Q5, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->invQuantStepSize_Q6, NLSF_mu_Q20, psNLSF_CB->order );
+
+        /* Add rate for first stage */
+        iCDF_ptr = &psNLSF_CB->CB1_iCDF[ ( signalType >> 1 ) * psNLSF_CB->nVectors ];
+        if( ind1 == 0 ) {
+            prob_Q8 = 256 - iCDF_ptr[ ind1 ];
+        } else {
+            prob_Q8 = iCDF_ptr[ ind1 - 1 ] - iCDF_ptr[ ind1 ];
+        }
+        bits_q7 = ( 8 << 7 ) - silk_lin2log( prob_Q8 );
+        RD_Q25[ s ] = silk_SMLABB( RD_Q25[ s ], bits_q7, silk_RSHIFT( NLSF_mu_Q20, 2 ) );
+    }
+
+    /* Find the lowest rate-distortion error */
+    silk_insertion_sort_increasing( RD_Q25, &bestIndex, nSurvivors, 1 );
+
+    NLSFIndices[ 0 ] = (opus_int8)tempIndices1[ bestIndex ];
+    silk_memcpy( &NLSFIndices[ 1 ], &tempIndices2[ bestIndex * MAX_LPC_ORDER ], psNLSF_CB->order * sizeof( opus_int8 ) );
+
+    /* Decode */
+    silk_NLSF_decode( pNLSF_Q15, NLSFIndices, psNLSF_CB );
+
+    return RD_Q25[ 0 ];
+}