freeswitch/libs/silk/src/SKP_Silk_encode_parameters.c

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

#include "SKP_Silk_main.h"

/*******************************************/
/* Encode parameters to create the payload */
/*******************************************/
void SKP_Silk_encode_parameters(
    SKP_Silk_encoder_state          *psEncC,        /* I/O  Encoder state                   */
    SKP_Silk_encoder_control        *psEncCtrlC,    /* I/O  Encoder control                 */
    SKP_Silk_range_coder_state      *psRC,          /* I/O  Range encoder state             */
    const SKP_int8                  *q              /* I    Quantization indices            */
)
{
    SKP_int   i, k, typeOffset;
    const SKP_Silk_NLSF_CB_struct *psNLSF_CB;


    /************************/
    /* Encode sampling rate */
    /************************/
    /* only done for first frame in packet */
    if( psEncC->nFramesInPayloadBuf == 0 ) {
        /* get sampling rate index */
        for( i = 0; i < 3; i++ ) {
            if( SKP_Silk_SamplingRates_table[ i ] == psEncC->fs_kHz ) {
                break;
            }
        }
        SKP_Silk_range_encoder( psRC, i, SKP_Silk_SamplingRates_CDF );
    }

    /*******************************************/
    /* Encode signal type and quantizer offset */
    /*******************************************/
    typeOffset = 2 * psEncCtrlC->sigtype + psEncCtrlC->QuantOffsetType;
    if( psEncC->nFramesInPayloadBuf == 0 ) {
        /* first frame in packet: independent coding */
        SKP_Silk_range_encoder( psRC, typeOffset, SKP_Silk_type_offset_CDF );
    } else {
        /* condidtional coding */
        SKP_Silk_range_encoder( psRC, typeOffset, SKP_Silk_type_offset_joint_CDF[ psEncC->typeOffsetPrev ] );
    }
    psEncC->typeOffsetPrev = typeOffset;

    /****************/
    /* Encode gains */
    /****************/
    /* first subframe */
    if( psEncC->nFramesInPayloadBuf == 0 ) {
        /* first frame in packet: independent coding */
        SKP_Silk_range_encoder( psRC, psEncCtrlC->GainsIndices[ 0 ], SKP_Silk_gain_CDF[ psEncCtrlC->sigtype ] );
    } else {
        /* condidtional coding */
        SKP_Silk_range_encoder( psRC, psEncCtrlC->GainsIndices[ 0 ], SKP_Silk_delta_gain_CDF );
    }

    /* remaining subframes */
    for( i = 1; i < NB_SUBFR; i++ ) {
        SKP_Silk_range_encoder( psRC, psEncCtrlC->GainsIndices[ i ], SKP_Silk_delta_gain_CDF );
    }


    /****************/
    /* Encode NLSFs */
    /****************/
    /* Range encoding of the NLSF path */
    psNLSF_CB = psEncC->psNLSF_CB[ psEncCtrlC->sigtype ];
    SKP_Silk_range_encoder_multi( psRC, psEncCtrlC->NLSFIndices, psNLSF_CB->StartPtr, psNLSF_CB->nStages );

    /* Encode NLSF interpolation factor */
    SKP_assert( psEncC->useInterpolatedNLSFs == 1 || psEncCtrlC->NLSFInterpCoef_Q2 == ( 1 << 2 ) );
    SKP_Silk_range_encoder( psRC, psEncCtrlC->NLSFInterpCoef_Q2, SKP_Silk_NLSF_interpolation_factor_CDF );


    if( psEncCtrlC->sigtype == SIG_TYPE_VOICED ) {
        /*********************/
        /* Encode pitch lags */
        /*********************/


        /* lag index */
        if( psEncC->fs_kHz == 8 ) {
            SKP_Silk_range_encoder( psRC, psEncCtrlC->lagIndex, SKP_Silk_pitch_lag_NB_CDF );
        } else if( psEncC->fs_kHz == 12 ) {
            SKP_Silk_range_encoder( psRC, psEncCtrlC->lagIndex, SKP_Silk_pitch_lag_MB_CDF );
        } else if( psEncC->fs_kHz == 16 ) {
            SKP_Silk_range_encoder( psRC, psEncCtrlC->lagIndex, SKP_Silk_pitch_lag_WB_CDF );
        } else {
            SKP_Silk_range_encoder( psRC, psEncCtrlC->lagIndex, SKP_Silk_pitch_lag_SWB_CDF );
        }


        /* countour index */
        if( psEncC->fs_kHz == 8 ) {
            /* Less codevectors used in 8 khz mode */
            SKP_Silk_range_encoder( psRC, psEncCtrlC->contourIndex, SKP_Silk_pitch_contour_NB_CDF );
        } else {
            /* Joint for 12, 16, 24 khz */
            SKP_Silk_range_encoder( psRC, psEncCtrlC->contourIndex, SKP_Silk_pitch_contour_CDF );
        }

        /********************/
        /* Encode LTP gains */
        /********************/

        /* PERIndex value */
        SKP_Silk_range_encoder( psRC, psEncCtrlC->PERIndex, SKP_Silk_LTP_per_index_CDF );

        /* Codebook Indices */
        for( k = 0; k < NB_SUBFR; k++ ) {
            SKP_Silk_range_encoder( psRC, psEncCtrlC->LTPIndex[ k ], SKP_Silk_LTP_gain_CDF_ptrs[ psEncCtrlC->PERIndex ] );
        }

        /**********************/
        /* Encode LTP scaling */
        /**********************/
        SKP_Silk_range_encoder( psRC, psEncCtrlC->LTP_scaleIndex, SKP_Silk_LTPscale_CDF );
    }


    /***************/
    /* Encode seed */
    /***************/
    SKP_Silk_range_encoder( psRC, psEncCtrlC->Seed, SKP_Silk_Seed_CDF );

    /*********************************************/
    /* Encode quantization indices of excitation */
    /*********************************************/
    SKP_Silk_encode_pulses( psRC, psEncCtrlC->sigtype, psEncCtrlC->QuantOffsetType, q, psEncC->frame_length );


    /*********************************************/
    /* Encode VAD flag                           */
    /*********************************************/
    SKP_Silk_range_encoder( psRC, psEncC->vadFlag, SKP_Silk_vadflag_CDF );
}