Add copy of opus library in deps/third_party.

opus/silk/decode_parameters.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"
+
+/* Decode parameters from payload */
+void silk_decode_parameters(
+    silk_decoder_state          *psDec,                         /* I/O  State                                       */
+    silk_decoder_control        *psDecCtrl,                     /* I/O  Decoder control                             */
+    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
+)
+{
+    opus_int   i, k, Ix;
+    opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], pNLSF0_Q15[ MAX_LPC_ORDER ];
+    const opus_int8 *cbk_ptr_Q7;
+
+    /* Dequant Gains */
+    silk_gains_dequant( psDecCtrl->Gains_Q16, psDec->indices.GainsIndices,
+        &psDec->LastGainIndex, condCoding == CODE_CONDITIONALLY, psDec->nb_subfr );
+
+    /****************/
+    /* Decode NLSFs */
+    /****************/
+    silk_NLSF_decode( pNLSF_Q15, psDec->indices.NLSFIndices, psDec->psNLSF_CB );
+
+    /* Convert NLSF parameters to AR prediction filter coefficients */
+    silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psDec->LPC_order );
+
+    /* If just reset, e.g., because internal Fs changed, do not allow interpolation */
+    /* improves the case of packet loss in the first frame after a switch           */
+    if( psDec->first_frame_after_reset == 1 ) {
+        psDec->indices.NLSFInterpCoef_Q2 = 4;
+    }
+
+    if( psDec->indices.NLSFInterpCoef_Q2 < 4 ) {
+        /* Calculation of the interpolated NLSF0 vector from the interpolation factor, */
+        /* the previous NLSF1, and the current NLSF1                                   */
+        for( i = 0; i < psDec->LPC_order; i++ ) {
+            pNLSF0_Q15[ i ] = psDec->prevNLSF_Q15[ i ] + silk_RSHIFT( silk_MUL( psDec->indices.NLSFInterpCoef_Q2,
+                pNLSF_Q15[ i ] - psDec->prevNLSF_Q15[ i ] ), 2 );
+        }
+
+        /* Convert NLSF parameters to AR prediction filter coefficients */
+        silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 0 ], pNLSF0_Q15, psDec->LPC_order );
+    } else {
+        /* Copy LPC coefficients for first half from second half */
+        silk_memcpy( psDecCtrl->PredCoef_Q12[ 0 ], psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) );
+    }
+
+    silk_memcpy( psDec->prevNLSF_Q15, pNLSF_Q15, psDec->LPC_order * sizeof( opus_int16 ) );
+
+    /* After a packet loss do BWE of LPC coefs */
+    if( psDec->lossCnt ) {
+        silk_bwexpander( psDecCtrl->PredCoef_Q12[ 0 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
+        silk_bwexpander( psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
+    }
+
+    if( psDec->indices.signalType == TYPE_VOICED ) {
+        /*********************/
+        /* Decode pitch lags */
+        /*********************/
+
+        /* Decode pitch values */
+        silk_decode_pitch( psDec->indices.lagIndex, psDec->indices.contourIndex, psDecCtrl->pitchL, psDec->fs_kHz, psDec->nb_subfr );
+
+        /* Decode Codebook Index */
+        cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ psDec->indices.PERIndex ]; /* set pointer to start of codebook */
+
+        for( k = 0; k < psDec->nb_subfr; k++ ) {
+            Ix = psDec->indices.LTPIndex[ k ];
+            for( i = 0; i < LTP_ORDER; i++ ) {
+                psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER + i ] = silk_LSHIFT( cbk_ptr_Q7[ Ix * LTP_ORDER + i ], 7 );
+            }
+        }
+
+        /**********************/
+        /* Decode LTP scaling */
+        /**********************/
+        Ix = psDec->indices.LTP_scaleIndex;
+        psDecCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ Ix ];
+    } else {
+        silk_memset( psDecCtrl->pitchL,      0,             psDec->nb_subfr * sizeof( opus_int   ) );
+        silk_memset( psDecCtrl->LTPCoef_Q14, 0, LTP_ORDER * psDec->nb_subfr * sizeof( opus_int16 ) );
+        psDec->indices.PERIndex  = 0;
+        psDecCtrl->LTP_scale_Q14 = 0;
+    }
+}