Create local copy of Opus v1.1.2

webrtc/modules/audio_coding/codecs/opus/opus/src/silk/decode_indices.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 side-information parameters from payload */
+void silk_decode_indices(
+    silk_decoder_state          *psDec,                         /* I/O  State                                       */
+    ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
+    opus_int                    FrameIndex,                     /* I    Frame number                                */
+    opus_int                    decode_LBRR,                    /* I    Flag indicating LBRR data is being decoded  */
+    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
+)
+{
+    opus_int   i, k, Ix;
+    opus_int   decode_absolute_lagIndex, delta_lagIndex;
+    opus_int16 ec_ix[ MAX_LPC_ORDER ];
+    opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
+
+    /*******************************************/
+    /* Decode signal type and quantizer offset */
+    /*******************************************/
+    if( decode_LBRR || psDec->VAD_flags[ FrameIndex ] ) {
+        Ix = ec_dec_icdf( psRangeDec, silk_type_offset_VAD_iCDF, 8 ) + 2;
+    } else {
+        Ix = ec_dec_icdf( psRangeDec, silk_type_offset_no_VAD_iCDF, 8 );
+    }
+    psDec->indices.signalType      = (opus_int8)silk_RSHIFT( Ix, 1 );
+    psDec->indices.quantOffsetType = (opus_int8)( Ix & 1 );
+
+    /****************/
+    /* Decode gains */
+    /****************/
+    /* First subframe */
+    if( condCoding == CODE_CONDITIONALLY ) {
+        /* Conditional coding */
+        psDec->indices.GainsIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
+    } else {
+        /* Independent coding, in two stages: MSB bits followed by 3 LSBs */
+        psDec->indices.GainsIndices[ 0 ]  = (opus_int8)silk_LSHIFT( ec_dec_icdf( psRangeDec, silk_gain_iCDF[ psDec->indices.signalType ], 8 ), 3 );
+        psDec->indices.GainsIndices[ 0 ] += (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform8_iCDF, 8 );
+    }
+
+    /* Remaining subframes */
+    for( i = 1; i < psDec->nb_subfr; i++ ) {
+        psDec->indices.GainsIndices[ i ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
+    }
+
+    /**********************/
+    /* Decode LSF Indices */
+    /**********************/
+    psDec->indices.NLSFIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->CB1_iCDF[ ( psDec->indices.signalType >> 1 ) * psDec->psNLSF_CB->nVectors ], 8 );
+    silk_NLSF_unpack( ec_ix, pred_Q8, psDec->psNLSF_CB, psDec->indices.NLSFIndices[ 0 ] );
+    silk_assert( psDec->psNLSF_CB->order == psDec->LPC_order );
+    for( i = 0; i < psDec->psNLSF_CB->order; i++ ) {
+        Ix = ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
+        if( Ix == 0 ) {
+            Ix -= ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
+        } else if( Ix == 2 * NLSF_QUANT_MAX_AMPLITUDE ) {
+            Ix += ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
+        }
+        psDec->indices.NLSFIndices[ i+1 ] = (opus_int8)( Ix - NLSF_QUANT_MAX_AMPLITUDE );
+    }
+
+    /* Decode LSF interpolation factor */
+    if( psDec->nb_subfr == MAX_NB_SUBFR ) {
+        psDec->indices.NLSFInterpCoef_Q2 = (opus_int8)ec_dec_icdf( psRangeDec, silk_NLSF_interpolation_factor_iCDF, 8 );
+    } else {
+        psDec->indices.NLSFInterpCoef_Q2 = 4;
+    }
+
+    if( psDec->indices.signalType == TYPE_VOICED )
+    {
+        /*********************/
+        /* Decode pitch lags */
+        /*********************/
+        /* Get lag index */
+        decode_absolute_lagIndex = 1;
+        if( condCoding == CODE_CONDITIONALLY && psDec->ec_prevSignalType == TYPE_VOICED ) {
+            /* Decode Delta index */
+            delta_lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_delta_iCDF, 8 );
+            if( delta_lagIndex > 0 ) {
+                delta_lagIndex = delta_lagIndex - 9;
+                psDec->indices.lagIndex = (opus_int16)( psDec->ec_prevLagIndex + delta_lagIndex );
+                decode_absolute_lagIndex = 0;
+            }
+        }
+        if( decode_absolute_lagIndex ) {
+            /* Absolute decoding */
+            psDec->indices.lagIndex  = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_lag_iCDF, 8 ) * silk_RSHIFT( psDec->fs_kHz, 1 );
+            psDec->indices.lagIndex += (opus_int16)ec_dec_icdf( psRangeDec, psDec->pitch_lag_low_bits_iCDF, 8 );
+        }
+        psDec->ec_prevLagIndex = psDec->indices.lagIndex;
+
+        /* Get countour index */
+        psDec->indices.contourIndex = (opus_int8)ec_dec_icdf( psRangeDec, psDec->pitch_contour_iCDF, 8 );
+
+        /********************/
+        /* Decode LTP gains */
+        /********************/
+        /* Decode PERIndex value */
+        psDec->indices.PERIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_per_index_iCDF, 8 );
+
+        for( k = 0; k < psDec->nb_subfr; k++ ) {
+            psDec->indices.LTPIndex[ k ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_gain_iCDF_ptrs[ psDec->indices.PERIndex ], 8 );
+        }
+
+        /**********************/
+        /* Decode LTP scaling */
+        /**********************/
+        if( condCoding == CODE_INDEPENDENTLY ) {
+            psDec->indices.LTP_scaleIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTPscale_iCDF, 8 );
+        } else {
+            psDec->indices.LTP_scaleIndex = 0;
+        }
+    }
+    psDec->ec_prevSignalType = psDec->indices.signalType;
+
+    /***************/
+    /* Decode seed */
+    /***************/
+    psDec->indices.Seed = (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform4_iCDF, 8 );
+}