Add copy of opus library in deps/third_party.

opus/silk/process_NLSFs.c

+/***********************************************************************
+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"
+
+/* Limit, stabilize, convert and quantize NLSFs */
+void silk_process_NLSFs(
+    silk_encoder_state          *psEncC,                            /* I/O  Encoder state                               */
+    opus_int16                  PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O    Prediction coefficients                     */
+    opus_int16                  pNLSF_Q15[         MAX_LPC_ORDER ], /* I/O  Normalized LSFs (quant out) (0 - (2^15-1))  */
+    const opus_int16            prev_NLSFq_Q15[    MAX_LPC_ORDER ]  /* I    Previous Normalized LSFs (0 - (2^15-1))     */
+)
+{
+    opus_int     i, doInterpolate;
+    opus_int     NLSF_mu_Q20;
+    opus_int32   i_sqr_Q15;
+    opus_int16   pNLSF0_temp_Q15[ MAX_LPC_ORDER ];
+    opus_int16   pNLSFW_QW[ MAX_LPC_ORDER ];
+    opus_int16   pNLSFW0_temp_QW[ MAX_LPC_ORDER ];
+
+    silk_assert( psEncC->speech_activity_Q8 >=   0 );
+    silk_assert( psEncC->speech_activity_Q8 <= SILK_FIX_CONST( 1.0, 8 ) );
+    silk_assert( psEncC->useInterpolatedNLSFs == 1 || psEncC->indices.NLSFInterpCoef_Q2 == ( 1 << 2 ) );
+
+    /***********************/
+    /* Calculate mu values */
+    /***********************/
+    /* NLSF_mu  = 0.003 - 0.0015 * psEnc->speech_activity; */
+    NLSF_mu_Q20 = silk_SMLAWB( SILK_FIX_CONST( 0.003, 20 ), SILK_FIX_CONST( -0.001, 28 ), psEncC->speech_activity_Q8 );
+    if( psEncC->nb_subfr == 2 ) {
+        /* Multiply by 1.5 for 10 ms packets */
+        NLSF_mu_Q20 = silk_ADD_RSHIFT( NLSF_mu_Q20, NLSF_mu_Q20, 1 );
+    }
+
+    silk_assert( NLSF_mu_Q20 >  0 );
+    silk_assert( NLSF_mu_Q20 <= SILK_FIX_CONST( 0.005, 20 ) );
+
+    /* Calculate NLSF weights */
+    silk_NLSF_VQ_weights_laroia( pNLSFW_QW, pNLSF_Q15, psEncC->predictLPCOrder );
+
+    /* Update NLSF weights for interpolated NLSFs */
+    doInterpolate = ( psEncC->useInterpolatedNLSFs == 1 ) && ( psEncC->indices.NLSFInterpCoef_Q2 < 4 );
+    if( doInterpolate ) {
+        /* Calculate the interpolated NLSF vector for the first half */
+        silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
+            psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
+
+        /* Calculate first half NLSF weights for the interpolated NLSFs */
+        silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_QW, pNLSF0_temp_Q15, psEncC->predictLPCOrder );
+
+        /* Update NLSF weights with contribution from first half */
+        i_sqr_Q15 = silk_LSHIFT( silk_SMULBB( psEncC->indices.NLSFInterpCoef_Q2, psEncC->indices.NLSFInterpCoef_Q2 ), 11 );
+        for( i = 0; i < psEncC->predictLPCOrder; i++ ) {
+            pNLSFW_QW[ i ] = silk_SMLAWB( silk_RSHIFT( pNLSFW_QW[ i ], 1 ), (opus_int32)pNLSFW0_temp_QW[ i ], i_sqr_Q15 );
+            silk_assert( pNLSFW_QW[ i ] >= 1 );
+        }
+    }
+
+    silk_NLSF_encode( psEncC->indices.NLSFIndices, pNLSF_Q15, psEncC->psNLSF_CB, pNLSFW_QW,
+        NLSF_mu_Q20, psEncC->NLSF_MSVQ_Survivors, psEncC->indices.signalType );
+
+    /* Convert quantized NLSFs back to LPC coefficients */
+    silk_NLSF2A( PredCoef_Q12[ 1 ], pNLSF_Q15, psEncC->predictLPCOrder );
+
+    if( doInterpolate ) {
+        /* Calculate the interpolated, quantized LSF vector for the first half */
+        silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
+            psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
+
+        /* Convert back to LPC coefficients */
+        silk_NLSF2A( PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEncC->predictLPCOrder );
+
+    } else {
+        /* Copy LPC coefficients for first half from second half */
+        silk_memcpy( PredCoef_Q12[ 0 ], PredCoef_Q12[ 1 ], psEncC->predictLPCOrder * sizeof( opus_int16 ) );
+    }
+}