freeswitch/libs/silk/src/SKP_Silk_decode_indices_v4.c

/***********************************************************************

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***********************************************************************/

#include "SKP_Silk_main.h"

/* Decode indices from payload */
void SKP_Silk_decode_indices_v4(
    SKP_Silk_decoder_state      *psDec            /* I/O....State                              */
)
{
    SKP_int   i, k, Ix, fs_kHz_dec, FramesInPacket = 0, FrameTermination;
    SKP_int   sigtype, QuantOffsetType, seed_int, nBytesUsed;
    SKP_int   decode_absolute_lagIndex, delta_lagIndex, prev_lagIndex = 0;
    const SKP_Silk_NLSF_CB_struct *psNLSF_CB = NULL;
    SKP_Silk_range_coder_state  *psRC = &psDec->sRC;
    /************************/
    /* Decode sampling rate */
    /************************/
    /* only done for first frame of packet */
    if( psDec->nFramesDecoded == 0 ) {
        SKP_Silk_range_decoder( &Ix, psRC, SKP_Silk_SamplingRates_CDF, SKP_Silk_SamplingRates_offset );

        /* check that sampling rate is supported */
        if( Ix < 0 || Ix > 3 ) {
            psRC->error = RANGE_CODER_ILLEGAL_SAMPLING_RATE;
            return;
        }
        fs_kHz_dec = SKP_Silk_SamplingRates_table[ Ix ];
        SKP_Silk_decoder_set_fs( psDec, fs_kHz_dec );

        FramesInPacket = 0;
        FrameTermination = SKP_SILK_MORE_FRAMES;
    }

    while( FrameTermination == SKP_SILK_MORE_FRAMES ) {
        /*********************************************/
        /* Decode VAD flag                           */
        /*********************************************/
        SKP_Silk_range_decoder( &psDec->vadFlagBuf[ FramesInPacket ], psRC, SKP_Silk_vadflag_CDF, SKP_Silk_vadflag_offset );

        /*******************************************/
        /* Decode signal type and quantizer offset */
        /*******************************************/





        if( FramesInPacket == 0 ) {
            /* first frame in packet: independent coding */
            SKP_Silk_range_decoder( &Ix, psRC, SKP_Silk_type_offset_CDF, SKP_Silk_type_offset_CDF_offset );
        } else {
            /* condidtional coding */
            SKP_Silk_range_decoder( &Ix, psRC, SKP_Silk_type_offset_joint_CDF[ psDec->typeOffsetPrev ],
                    SKP_Silk_type_offset_CDF_offset );
        }
        sigtype               = SKP_RSHIFT( Ix, 1 );
        QuantOffsetType       = Ix & 1;
        psDec->typeOffsetPrev = Ix;

        /****************/
        /* Decode gains */
        /****************/
        /* first subframe */
        if( FramesInPacket == 0 ) {
            /* first frame in packet: independent coding */
            SKP_Silk_range_decoder( &psDec->GainsIndices[ FramesInPacket ][ 0 ], psRC, SKP_Silk_gain_CDF[ sigtype ], SKP_Silk_gain_CDF_offset );
        } else {
            /* condidtional coding */
            SKP_Silk_range_decoder( &psDec->GainsIndices[ FramesInPacket ][ 0 ], psRC, SKP_Silk_delta_gain_CDF, SKP_Silk_delta_gain_CDF_offset );
        }

        /* remaining subframes */
        for( i = 1; i < NB_SUBFR; i++ ) {
            SKP_Silk_range_decoder( &psDec->GainsIndices[ FramesInPacket ][ i ], psRC, SKP_Silk_delta_gain_CDF, SKP_Silk_delta_gain_CDF_offset );
        }

        /**********************/
        /* Decode LSF Indices */
        /**********************/

        /* Set pointer to LSF VQ CB for the current signal type */
        psNLSF_CB = psDec->psNLSF_CB[ sigtype ];

        /* Arithmetically decode NLSF path */
        SKP_Silk_range_decoder_multi( psDec->NLSFIndices[ FramesInPacket ], psRC, psNLSF_CB->StartPtr, psNLSF_CB->MiddleIx, psNLSF_CB->nStages );

        /***********************************/
        /* Decode LSF interpolation factor */
        /***********************************/
        SKP_Silk_range_decoder( &psDec->NLSFInterpCoef_Q2[ FramesInPacket ], psRC, SKP_Silk_NLSF_interpolation_factor_CDF,
            SKP_Silk_NLSF_interpolation_factor_offset );

        if( sigtype == SIG_TYPE_VOICED ) {
            /*********************/
            /* Decode pitch lags */





            /*********************/
            /* Get lag index */
            decode_absolute_lagIndex = 1;
            if( FramesInPacket > 0 && psDec->sigtype[ FramesInPacket - 1 ] == SIG_TYPE_VOICED ) {
                /* Decode Delta index */
                SKP_Silk_range_decoder( &delta_lagIndex,psRC, SKP_Silk_pitch_delta_CDF,  SKP_Silk_pitch_delta_CDF_offset );
                if( delta_lagIndex < ( MAX_DELTA_LAG << 1 ) + 1 ) {
                    delta_lagIndex = delta_lagIndex - MAX_DELTA_LAG;
                    psDec->lagIndex[ FramesInPacket ] = prev_lagIndex + delta_lagIndex;
                    decode_absolute_lagIndex = 0;
                }
            }
            if( decode_absolute_lagIndex ) {
                /* Absolute decoding */
                if( psDec->fs_kHz == 8 ) {
                    SKP_Silk_range_decoder( &psDec->lagIndex[ FramesInPacket ], psRC, SKP_Silk_pitch_lag_NB_CDF,  SKP_Silk_pitch_lag_NB_CDF_offset );
                } else if( psDec->fs_kHz == 12 ) {
                    SKP_Silk_range_decoder( &psDec->lagIndex[ FramesInPacket ], psRC, SKP_Silk_pitch_lag_MB_CDF,  SKP_Silk_pitch_lag_MB_CDF_offset );
                } else if( psDec->fs_kHz == 16 ) {
                    SKP_Silk_range_decoder( &psDec->lagIndex[ FramesInPacket ], psRC, SKP_Silk_pitch_lag_WB_CDF,  SKP_Silk_pitch_lag_WB_CDF_offset );
                } else {
                    SKP_Silk_range_decoder( &psDec->lagIndex[ FramesInPacket ], psRC, SKP_Silk_pitch_lag_SWB_CDF, SKP_Silk_pitch_lag_SWB_CDF_offset );
                }
            }
            prev_lagIndex = psDec->lagIndex[ FramesInPacket ];

            /* Get countour index */
            if( psDec->fs_kHz == 8 ) {
                /* Less codevectors used in 8 khz mode */
                SKP_Silk_range_decoder( &psDec->contourIndex[ FramesInPacket ], psRC, SKP_Silk_pitch_contour_NB_CDF, SKP_Silk_pitch_contour_NB_CDF_offset );
            } else {
                /* Joint for 12, 16, and 24 khz */
                SKP_Silk_range_decoder( &psDec->contourIndex[ FramesInPacket ], psRC, SKP_Silk_pitch_contour_CDF, SKP_Silk_pitch_contour_CDF_offset );
            }

            /********************/
            /* Decode LTP gains */
            /********************/
            /* Decode PERIndex value */
            SKP_Silk_range_decoder( &psDec->PERIndex[ FramesInPacket ], psRC, SKP_Silk_LTP_per_index_CDF, SKP_Silk_LTP_per_index_CDF_offset );

            for( k = 0; k < NB_SUBFR; k++ ) {
                SKP_Silk_range_decoder( &psDec->LTPIndex[ FramesInPacket ][ k ], psRC, SKP_Silk_LTP_gain_CDF_ptrs[ psDec->PERIndex[ FramesInPacket ] ],
                    SKP_Silk_LTP_gain_CDF_offsets[ psDec->PERIndex[ FramesInPacket ] ] );
            }

            /**********************/
            /* Decode LTP scaling */





            /**********************/
            SKP_Silk_range_decoder( &psDec->LTP_scaleIndex[ FramesInPacket ], psRC, SKP_Silk_LTPscale_CDF, SKP_Silk_LTPscale_offset );
        }

        /***************/
        /* Decode seed */
        /***************/
        SKP_Silk_range_decoder( &seed_int, psRC, SKP_Silk_Seed_CDF, SKP_Silk_Seed_offset );
        psDec->Seed[ FramesInPacket ] = (SKP_int32)seed_int;
        /**************************************/
        /* Decode Frame termination indicator */
        /**************************************/
        SKP_Silk_range_decoder( &FrameTermination, psRC, SKP_Silk_FrameTermination_v4_CDF, SKP_Silk_FrameTermination_v4_offset );

        psDec->sigtype[ FramesInPacket ]         = sigtype;
        psDec->QuantOffsetType[ FramesInPacket ] = QuantOffsetType;

        FramesInPacket++;
    }

    /****************************************/
    /* get number of bytes used so far      */
    /****************************************/
    SKP_Silk_range_coder_get_length( psRC, &nBytesUsed );
    psDec->nBytesLeft = psRC->bufferLength - nBytesUsed;
    if( psDec->nBytesLeft < 0 ) {
        psRC->error = RANGE_CODER_READ_BEYOND_BUFFER;
    }

    psDec->nFramesInPacket  = FramesInPacket;
    psDec->FrameTermination = FrameTermination;
}