cannam@154: /***********************************************************************
cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
cannam@154: Redistribution and use in source and binary forms, with or without
cannam@154: modification, are permitted provided that the following conditions
cannam@154: are met:
cannam@154: - Redistributions of source code must retain the above copyright notice,
cannam@154: this list of conditions and the following disclaimer.
cannam@154: - Redistributions in binary form must reproduce the above copyright
cannam@154: notice, this list of conditions and the following disclaimer in the
cannam@154: documentation and/or other materials provided with the distribution.
cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the
cannam@154: names of specific contributors, may be used to endorse or promote
cannam@154: products derived from this software without specific prior written
cannam@154: permission.
cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
cannam@154: POSSIBILITY OF SUCH DAMAGE.
cannam@154: ***********************************************************************/
cannam@154: 
cannam@154: #ifdef HAVE_CONFIG_H
cannam@154: #include "config.h"
cannam@154: #endif
cannam@154: 
cannam@154: #include "main.h"
cannam@154: 
cannam@154: /* Decode side-information parameters from payload */
cannam@154: void silk_decode_indices(
cannam@154:     silk_decoder_state          *psDec,                         /* I/O  State                                       */
cannam@154:     ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
cannam@154:     opus_int                    FrameIndex,                     /* I    Frame number                                */
cannam@154:     opus_int                    decode_LBRR,                    /* I    Flag indicating LBRR data is being decoded  */
cannam@154:     opus_int                    condCoding                      /* I    The type of conditional coding to use       */
cannam@154: )
cannam@154: {
cannam@154:     opus_int   i, k, Ix;
cannam@154:     opus_int   decode_absolute_lagIndex, delta_lagIndex;
cannam@154:     opus_int16 ec_ix[ MAX_LPC_ORDER ];
cannam@154:     opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
cannam@154: 
cannam@154:     /*******************************************/
cannam@154:     /* Decode signal type and quantizer offset */
cannam@154:     /*******************************************/
cannam@154:     if( decode_LBRR || psDec->VAD_flags[ FrameIndex ] ) {
cannam@154:         Ix = ec_dec_icdf( psRangeDec, silk_type_offset_VAD_iCDF, 8 ) + 2;
cannam@154:     } else {
cannam@154:         Ix = ec_dec_icdf( psRangeDec, silk_type_offset_no_VAD_iCDF, 8 );
cannam@154:     }
cannam@154:     psDec->indices.signalType      = (opus_int8)silk_RSHIFT( Ix, 1 );
cannam@154:     psDec->indices.quantOffsetType = (opus_int8)( Ix & 1 );
cannam@154: 
cannam@154:     /****************/
cannam@154:     /* Decode gains */
cannam@154:     /****************/
cannam@154:     /* First subframe */
cannam@154:     if( condCoding == CODE_CONDITIONALLY ) {
cannam@154:         /* Conditional coding */
cannam@154:         psDec->indices.GainsIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
cannam@154:     } else {
cannam@154:         /* Independent coding, in two stages: MSB bits followed by 3 LSBs */
cannam@154:         psDec->indices.GainsIndices[ 0 ]  = (opus_int8)silk_LSHIFT( ec_dec_icdf( psRangeDec, silk_gain_iCDF[ psDec->indices.signalType ], 8 ), 3 );
cannam@154:         psDec->indices.GainsIndices[ 0 ] += (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform8_iCDF, 8 );
cannam@154:     }
cannam@154: 
cannam@154:     /* Remaining subframes */
cannam@154:     for( i = 1; i < psDec->nb_subfr; i++ ) {
cannam@154:         psDec->indices.GainsIndices[ i ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
cannam@154:     }
cannam@154: 
cannam@154:     /**********************/
cannam@154:     /* Decode LSF Indices */
cannam@154:     /**********************/
cannam@154:     psDec->indices.NLSFIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->CB1_iCDF[ ( psDec->indices.signalType >> 1 ) * psDec->psNLSF_CB->nVectors ], 8 );
cannam@154:     silk_NLSF_unpack( ec_ix, pred_Q8, psDec->psNLSF_CB, psDec->indices.NLSFIndices[ 0 ] );
cannam@154:     celt_assert( psDec->psNLSF_CB->order == psDec->LPC_order );
cannam@154:     for( i = 0; i < psDec->psNLSF_CB->order; i++ ) {
cannam@154:         Ix = ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
cannam@154:         if( Ix == 0 ) {
cannam@154:             Ix -= ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
cannam@154:         } else if( Ix == 2 * NLSF_QUANT_MAX_AMPLITUDE ) {
cannam@154:             Ix += ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
cannam@154:         }
cannam@154:         psDec->indices.NLSFIndices[ i+1 ] = (opus_int8)( Ix - NLSF_QUANT_MAX_AMPLITUDE );
cannam@154:     }
cannam@154: 
cannam@154:     /* Decode LSF interpolation factor */
cannam@154:     if( psDec->nb_subfr == MAX_NB_SUBFR ) {
cannam@154:         psDec->indices.NLSFInterpCoef_Q2 = (opus_int8)ec_dec_icdf( psRangeDec, silk_NLSF_interpolation_factor_iCDF, 8 );
cannam@154:     } else {
cannam@154:         psDec->indices.NLSFInterpCoef_Q2 = 4;
cannam@154:     }
cannam@154: 
cannam@154:     if( psDec->indices.signalType == TYPE_VOICED )
cannam@154:     {
cannam@154:         /*********************/
cannam@154:         /* Decode pitch lags */
cannam@154:         /*********************/
cannam@154:         /* Get lag index */
cannam@154:         decode_absolute_lagIndex = 1;
cannam@154:         if( condCoding == CODE_CONDITIONALLY && psDec->ec_prevSignalType == TYPE_VOICED ) {
cannam@154:             /* Decode Delta index */
cannam@154:             delta_lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_delta_iCDF, 8 );
cannam@154:             if( delta_lagIndex > 0 ) {
cannam@154:                 delta_lagIndex = delta_lagIndex - 9;
cannam@154:                 psDec->indices.lagIndex = (opus_int16)( psDec->ec_prevLagIndex + delta_lagIndex );
cannam@154:                 decode_absolute_lagIndex = 0;
cannam@154:             }
cannam@154:         }
cannam@154:         if( decode_absolute_lagIndex ) {
cannam@154:             /* Absolute decoding */
cannam@154:             psDec->indices.lagIndex  = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_lag_iCDF, 8 ) * silk_RSHIFT( psDec->fs_kHz, 1 );
cannam@154:             psDec->indices.lagIndex += (opus_int16)ec_dec_icdf( psRangeDec, psDec->pitch_lag_low_bits_iCDF, 8 );
cannam@154:         }
cannam@154:         psDec->ec_prevLagIndex = psDec->indices.lagIndex;
cannam@154: 
cannam@154:         /* Get countour index */
cannam@154:         psDec->indices.contourIndex = (opus_int8)ec_dec_icdf( psRangeDec, psDec->pitch_contour_iCDF, 8 );
cannam@154: 
cannam@154:         /********************/
cannam@154:         /* Decode LTP gains */
cannam@154:         /********************/
cannam@154:         /* Decode PERIndex value */
cannam@154:         psDec->indices.PERIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_per_index_iCDF, 8 );
cannam@154: 
cannam@154:         for( k = 0; k < psDec->nb_subfr; k++ ) {
cannam@154:             psDec->indices.LTPIndex[ k ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_gain_iCDF_ptrs[ psDec->indices.PERIndex ], 8 );
cannam@154:         }
cannam@154: 
cannam@154:         /**********************/
cannam@154:         /* Decode LTP scaling */
cannam@154:         /**********************/
cannam@154:         if( condCoding == CODE_INDEPENDENTLY ) {
cannam@154:             psDec->indices.LTP_scaleIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTPscale_iCDF, 8 );
cannam@154:         } else {
cannam@154:             psDec->indices.LTP_scaleIndex = 0;
cannam@154:         }
cannam@154:     }
cannam@154:     psDec->ec_prevSignalType = psDec->indices.signalType;
cannam@154: 
cannam@154:     /***************/
cannam@154:     /* Decode seed */
cannam@154:     /***************/
cannam@154:     psDec->indices.Seed = (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform4_iCDF, 8 );
cannam@154: }