michael@0: /***********************************************************************
michael@0: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
michael@0: Redistribution and use in source and binary forms, with or without
michael@0: modification, are permitted provided that the following conditions
michael@0: are met:
michael@0: - Redistributions of source code must retain the above copyright notice,
michael@0: this list of conditions and the following disclaimer.
michael@0: - Redistributions in binary form must reproduce the above copyright
michael@0: notice, this list of conditions and the following disclaimer in the
michael@0: documentation and/or other materials provided with the distribution.
michael@0: - Neither the name of Internet Society, IETF or IETF Trust, nor the
michael@0: names of specific contributors, may be used to endorse or promote
michael@0: products derived from this software without specific prior written
michael@0: permission.
michael@0: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
michael@0: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
michael@0: POSSIBILITY OF SUCH DAMAGE.
michael@0: ***********************************************************************/
michael@0: 
michael@0: #ifdef HAVE_CONFIG_H
michael@0: #include "config.h"
michael@0: #endif
michael@0: 
michael@0: #include "main.h"
michael@0: 
michael@0: /* Decode side-information parameters from payload */
michael@0: void silk_decode_indices(
michael@0:     silk_decoder_state          *psDec,                         /* I/O  State                                       */
michael@0:     ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
michael@0:     opus_int                    FrameIndex,                     /* I    Frame number                                */
michael@0:     opus_int                    decode_LBRR,                    /* I    Flag indicating LBRR data is being decoded  */
michael@0:     opus_int                    condCoding                      /* I    The type of conditional coding to use       */
michael@0: )
michael@0: {
michael@0:     opus_int   i, k, Ix;
michael@0:     opus_int   decode_absolute_lagIndex, delta_lagIndex;
michael@0:     opus_int16 ec_ix[ MAX_LPC_ORDER ];
michael@0:     opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
michael@0: 
michael@0:     /*******************************************/
michael@0:     /* Decode signal type and quantizer offset */
michael@0:     /*******************************************/
michael@0:     if( decode_LBRR || psDec->VAD_flags[ FrameIndex ] ) {
michael@0:         Ix = ec_dec_icdf( psRangeDec, silk_type_offset_VAD_iCDF, 8 ) + 2;
michael@0:     } else {
michael@0:         Ix = ec_dec_icdf( psRangeDec, silk_type_offset_no_VAD_iCDF, 8 );
michael@0:     }
michael@0:     psDec->indices.signalType      = (opus_int8)silk_RSHIFT( Ix, 1 );
michael@0:     psDec->indices.quantOffsetType = (opus_int8)( Ix & 1 );
michael@0: 
michael@0:     /****************/
michael@0:     /* Decode gains */
michael@0:     /****************/
michael@0:     /* First subframe */
michael@0:     if( condCoding == CODE_CONDITIONALLY ) {
michael@0:         /* Conditional coding */
michael@0:         psDec->indices.GainsIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
michael@0:     } else {
michael@0:         /* Independent coding, in two stages: MSB bits followed by 3 LSBs */
michael@0:         psDec->indices.GainsIndices[ 0 ]  = (opus_int8)silk_LSHIFT( ec_dec_icdf( psRangeDec, silk_gain_iCDF[ psDec->indices.signalType ], 8 ), 3 );
michael@0:         psDec->indices.GainsIndices[ 0 ] += (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform8_iCDF, 8 );
michael@0:     }
michael@0: 
michael@0:     /* Remaining subframes */
michael@0:     for( i = 1; i < psDec->nb_subfr; i++ ) {
michael@0:         psDec->indices.GainsIndices[ i ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
michael@0:     }
michael@0: 
michael@0:     /**********************/
michael@0:     /* Decode LSF Indices */
michael@0:     /**********************/
michael@0:     psDec->indices.NLSFIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->CB1_iCDF[ ( psDec->indices.signalType >> 1 ) * psDec->psNLSF_CB->nVectors ], 8 );
michael@0:     silk_NLSF_unpack( ec_ix, pred_Q8, psDec->psNLSF_CB, psDec->indices.NLSFIndices[ 0 ] );
michael@0:     silk_assert( psDec->psNLSF_CB->order == psDec->LPC_order );
michael@0:     for( i = 0; i < psDec->psNLSF_CB->order; i++ ) {
michael@0:         Ix = ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
michael@0:         if( Ix == 0 ) {
michael@0:             Ix -= ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
michael@0:         } else if( Ix == 2 * NLSF_QUANT_MAX_AMPLITUDE ) {
michael@0:             Ix += ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
michael@0:         }
michael@0:         psDec->indices.NLSFIndices[ i+1 ] = (opus_int8)( Ix - NLSF_QUANT_MAX_AMPLITUDE );
michael@0:     }
michael@0: 
michael@0:     /* Decode LSF interpolation factor */
michael@0:     if( psDec->nb_subfr == MAX_NB_SUBFR ) {
michael@0:         psDec->indices.NLSFInterpCoef_Q2 = (opus_int8)ec_dec_icdf( psRangeDec, silk_NLSF_interpolation_factor_iCDF, 8 );
michael@0:     } else {
michael@0:         psDec->indices.NLSFInterpCoef_Q2 = 4;
michael@0:     }
michael@0: 
michael@0:     if( psDec->indices.signalType == TYPE_VOICED )
michael@0:     {
michael@0:         /*********************/
michael@0:         /* Decode pitch lags */
michael@0:         /*********************/
michael@0:         /* Get lag index */
michael@0:         decode_absolute_lagIndex = 1;
michael@0:         if( condCoding == CODE_CONDITIONALLY && psDec->ec_prevSignalType == TYPE_VOICED ) {
michael@0:             /* Decode Delta index */
michael@0:             delta_lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_delta_iCDF, 8 );
michael@0:             if( delta_lagIndex > 0 ) {
michael@0:                 delta_lagIndex = delta_lagIndex - 9;
michael@0:                 psDec->indices.lagIndex = (opus_int16)( psDec->ec_prevLagIndex + delta_lagIndex );
michael@0:                 decode_absolute_lagIndex = 0;
michael@0:             }
michael@0:         }
michael@0:         if( decode_absolute_lagIndex ) {
michael@0:             /* Absolute decoding */
michael@0:             psDec->indices.lagIndex  = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_lag_iCDF, 8 ) * silk_RSHIFT( psDec->fs_kHz, 1 );
michael@0:             psDec->indices.lagIndex += (opus_int16)ec_dec_icdf( psRangeDec, psDec->pitch_lag_low_bits_iCDF, 8 );
michael@0:         }
michael@0:         psDec->ec_prevLagIndex = psDec->indices.lagIndex;
michael@0: 
michael@0:         /* Get countour index */
michael@0:         psDec->indices.contourIndex = (opus_int8)ec_dec_icdf( psRangeDec, psDec->pitch_contour_iCDF, 8 );
michael@0: 
michael@0:         /********************/
michael@0:         /* Decode LTP gains */
michael@0:         /********************/
michael@0:         /* Decode PERIndex value */
michael@0:         psDec->indices.PERIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_per_index_iCDF, 8 );
michael@0: 
michael@0:         for( k = 0; k < psDec->nb_subfr; k++ ) {
michael@0:             psDec->indices.LTPIndex[ k ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_gain_iCDF_ptrs[ psDec->indices.PERIndex ], 8 );
michael@0:         }
michael@0: 
michael@0:         /**********************/
michael@0:         /* Decode LTP scaling */
michael@0:         /**********************/
michael@0:         if( condCoding == CODE_INDEPENDENTLY ) {
michael@0:             psDec->indices.LTP_scaleIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTPscale_iCDF, 8 );
michael@0:         } else {
michael@0:             psDec->indices.LTP_scaleIndex = 0;
michael@0:         }
michael@0:     }
michael@0:     psDec->ec_prevSignalType = psDec->indices.signalType;
michael@0: 
michael@0:     /***************/
michael@0:     /* Decode seed */
michael@0:     /***************/
michael@0:     psDec->indices.Seed = (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform4_iCDF, 8 );
michael@0: }