Chris@69: /***********************************************************************
Chris@69: Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Chris@69: Redistribution and use in source and binary forms, with or without
Chris@69: modification, are permitted provided that the following conditions
Chris@69: are met:
Chris@69: - Redistributions of source code must retain the above copyright notice,
Chris@69: this list of conditions and the following disclaimer.
Chris@69: - Redistributions in binary form must reproduce the above copyright
Chris@69: notice, this list of conditions and the following disclaimer in the
Chris@69: documentation and/or other materials provided with the distribution.
Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the
Chris@69: names of specific contributors, may be used to endorse or promote
Chris@69: products derived from this software without specific prior written
Chris@69: permission.
Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Chris@69: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Chris@69: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
Chris@69: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
Chris@69: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
Chris@69: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
Chris@69: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
Chris@69: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
Chris@69: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
Chris@69: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Chris@69: POSSIBILITY OF SUCH DAMAGE.
Chris@69: ***********************************************************************/
Chris@69: 
Chris@69: #ifdef HAVE_CONFIG_H
Chris@69: #include "config.h"
Chris@69: #endif
Chris@69: 
Chris@69: #include "main.h"
Chris@69: 
Chris@69: /* Decode side-information parameters from payload */
Chris@69: void silk_decode_indices(
Chris@69:     silk_decoder_state          *psDec,                         /* I/O  State                                       */
Chris@69:     ec_dec                      *psRangeDec,                    /* I/O  Compressor data structure                   */
Chris@69:     opus_int                    FrameIndex,                     /* I    Frame number                                */
Chris@69:     opus_int                    decode_LBRR,                    /* I    Flag indicating LBRR data is being decoded  */
Chris@69:     opus_int                    condCoding                      /* I    The type of conditional coding to use       */
Chris@69: )
Chris@69: {
Chris@69:     opus_int   i, k, Ix;
Chris@69:     opus_int   decode_absolute_lagIndex, delta_lagIndex;
Chris@69:     opus_int16 ec_ix[ MAX_LPC_ORDER ];
Chris@69:     opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
Chris@69: 
Chris@69:     /*******************************************/
Chris@69:     /* Decode signal type and quantizer offset */
Chris@69:     /*******************************************/
Chris@69:     if( decode_LBRR || psDec->VAD_flags[ FrameIndex ] ) {
Chris@69:         Ix = ec_dec_icdf( psRangeDec, silk_type_offset_VAD_iCDF, 8 ) + 2;
Chris@69:     } else {
Chris@69:         Ix = ec_dec_icdf( psRangeDec, silk_type_offset_no_VAD_iCDF, 8 );
Chris@69:     }
Chris@69:     psDec->indices.signalType      = (opus_int8)silk_RSHIFT( Ix, 1 );
Chris@69:     psDec->indices.quantOffsetType = (opus_int8)( Ix & 1 );
Chris@69: 
Chris@69:     /****************/
Chris@69:     /* Decode gains */
Chris@69:     /****************/
Chris@69:     /* First subframe */
Chris@69:     if( condCoding == CODE_CONDITIONALLY ) {
Chris@69:         /* Conditional coding */
Chris@69:         psDec->indices.GainsIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
Chris@69:     } else {
Chris@69:         /* Independent coding, in two stages: MSB bits followed by 3 LSBs */
Chris@69:         psDec->indices.GainsIndices[ 0 ]  = (opus_int8)silk_LSHIFT( ec_dec_icdf( psRangeDec, silk_gain_iCDF[ psDec->indices.signalType ], 8 ), 3 );
Chris@69:         psDec->indices.GainsIndices[ 0 ] += (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform8_iCDF, 8 );
Chris@69:     }
Chris@69: 
Chris@69:     /* Remaining subframes */
Chris@69:     for( i = 1; i < psDec->nb_subfr; i++ ) {
Chris@69:         psDec->indices.GainsIndices[ i ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_delta_gain_iCDF, 8 );
Chris@69:     }
Chris@69: 
Chris@69:     /**********************/
Chris@69:     /* Decode LSF Indices */
Chris@69:     /**********************/
Chris@69:     psDec->indices.NLSFIndices[ 0 ] = (opus_int8)ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->CB1_iCDF[ ( psDec->indices.signalType >> 1 ) * psDec->psNLSF_CB->nVectors ], 8 );
Chris@69:     silk_NLSF_unpack( ec_ix, pred_Q8, psDec->psNLSF_CB, psDec->indices.NLSFIndices[ 0 ] );
Chris@69:     celt_assert( psDec->psNLSF_CB->order == psDec->LPC_order );
Chris@69:     for( i = 0; i < psDec->psNLSF_CB->order; i++ ) {
Chris@69:         Ix = ec_dec_icdf( psRangeDec, &psDec->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
Chris@69:         if( Ix == 0 ) {
Chris@69:             Ix -= ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
Chris@69:         } else if( Ix == 2 * NLSF_QUANT_MAX_AMPLITUDE ) {
Chris@69:             Ix += ec_dec_icdf( psRangeDec, silk_NLSF_EXT_iCDF, 8 );
Chris@69:         }
Chris@69:         psDec->indices.NLSFIndices[ i+1 ] = (opus_int8)( Ix - NLSF_QUANT_MAX_AMPLITUDE );
Chris@69:     }
Chris@69: 
Chris@69:     /* Decode LSF interpolation factor */
Chris@69:     if( psDec->nb_subfr == MAX_NB_SUBFR ) {
Chris@69:         psDec->indices.NLSFInterpCoef_Q2 = (opus_int8)ec_dec_icdf( psRangeDec, silk_NLSF_interpolation_factor_iCDF, 8 );
Chris@69:     } else {
Chris@69:         psDec->indices.NLSFInterpCoef_Q2 = 4;
Chris@69:     }
Chris@69: 
Chris@69:     if( psDec->indices.signalType == TYPE_VOICED )
Chris@69:     {
Chris@69:         /*********************/
Chris@69:         /* Decode pitch lags */
Chris@69:         /*********************/
Chris@69:         /* Get lag index */
Chris@69:         decode_absolute_lagIndex = 1;
Chris@69:         if( condCoding == CODE_CONDITIONALLY && psDec->ec_prevSignalType == TYPE_VOICED ) {
Chris@69:             /* Decode Delta index */
Chris@69:             delta_lagIndex = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_delta_iCDF, 8 );
Chris@69:             if( delta_lagIndex > 0 ) {
Chris@69:                 delta_lagIndex = delta_lagIndex - 9;
Chris@69:                 psDec->indices.lagIndex = (opus_int16)( psDec->ec_prevLagIndex + delta_lagIndex );
Chris@69:                 decode_absolute_lagIndex = 0;
Chris@69:             }
Chris@69:         }
Chris@69:         if( decode_absolute_lagIndex ) {
Chris@69:             /* Absolute decoding */
Chris@69:             psDec->indices.lagIndex  = (opus_int16)ec_dec_icdf( psRangeDec, silk_pitch_lag_iCDF, 8 ) * silk_RSHIFT( psDec->fs_kHz, 1 );
Chris@69:             psDec->indices.lagIndex += (opus_int16)ec_dec_icdf( psRangeDec, psDec->pitch_lag_low_bits_iCDF, 8 );
Chris@69:         }
Chris@69:         psDec->ec_prevLagIndex = psDec->indices.lagIndex;
Chris@69: 
Chris@69:         /* Get countour index */
Chris@69:         psDec->indices.contourIndex = (opus_int8)ec_dec_icdf( psRangeDec, psDec->pitch_contour_iCDF, 8 );
Chris@69: 
Chris@69:         /********************/
Chris@69:         /* Decode LTP gains */
Chris@69:         /********************/
Chris@69:         /* Decode PERIndex value */
Chris@69:         psDec->indices.PERIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_per_index_iCDF, 8 );
Chris@69: 
Chris@69:         for( k = 0; k < psDec->nb_subfr; k++ ) {
Chris@69:             psDec->indices.LTPIndex[ k ] = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTP_gain_iCDF_ptrs[ psDec->indices.PERIndex ], 8 );
Chris@69:         }
Chris@69: 
Chris@69:         /**********************/
Chris@69:         /* Decode LTP scaling */
Chris@69:         /**********************/
Chris@69:         if( condCoding == CODE_INDEPENDENTLY ) {
Chris@69:             psDec->indices.LTP_scaleIndex = (opus_int8)ec_dec_icdf( psRangeDec, silk_LTPscale_iCDF, 8 );
Chris@69:         } else {
Chris@69:             psDec->indices.LTP_scaleIndex = 0;
Chris@69:         }
Chris@69:     }
Chris@69:     psDec->ec_prevSignalType = psDec->indices.signalType;
Chris@69: 
Chris@69:     /***************/
Chris@69:     /* Decode seed */
Chris@69:     /***************/
Chris@69:     psDec->indices.Seed = (opus_int8)ec_dec_icdf( psRangeDec, silk_uniform4_iCDF, 8 );
Chris@69: }