shithub: opus

ref: 41443428cbb9b551d96c687f70bae37ac3b32afb
dir: /silk/encode_indices.c/

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/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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are met:
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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***********************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "main.h"

/* Encode side-information parameters to payload */
void silk_encode_indices(
    silk_encoder_state          *psEncC,                        /* I/O  Encoder state                               */
    ec_enc                      *psRangeEnc,                    /* I/O  Compressor data structure                   */
    opus_int                    FrameIndex,                     /* I    Frame number                                */
    opus_int                    encode_LBRR,                    /* I    Flag indicating LBRR data is being encoded  */
    opus_int                    condCoding                      /* I    The type of conditional coding to use       */
)
{
    opus_int   i, k, typeOffset;
    opus_int   encode_absolute_lagIndex, delta_lagIndex;
    opus_int16 ec_ix[ MAX_LPC_ORDER ];
    opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
    const SideInfoIndices *psIndices;

    if( encode_LBRR ) {
         psIndices = &psEncC->indices_LBRR[ FrameIndex ];
    } else {
         psIndices = &psEncC->indices;
    }

    /*******************************************/
    /* Encode signal type and quantizer offset */
    /*******************************************/
    typeOffset = 2 * psIndices->signalType + psIndices->quantOffsetType;
    silk_assert( typeOffset >= 0 && typeOffset < 6 );
    silk_assert( encode_LBRR == 0 || typeOffset >= 2 );
    if( encode_LBRR || typeOffset >= 2 ) {
        ec_enc_icdf( psRangeEnc, typeOffset - 2, silk_type_offset_VAD_iCDF, 8 );
    } else {
        ec_enc_icdf( psRangeEnc, typeOffset, silk_type_offset_no_VAD_iCDF, 8 );
    }

    /****************/
    /* Encode gains */
    /****************/
    /* first subframe */
    if( condCoding == CODE_CONDITIONALLY ) {
        /* conditional coding */
        silk_assert( psIndices->GainsIndices[ 0 ] >= 0 && psIndices->GainsIndices[ 0 ] < MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 );
        ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ 0 ], silk_delta_gain_iCDF, 8 );
    } else {
        /* independent coding, in two stages: MSB bits followed by 3 LSBs */
        silk_assert( psIndices->GainsIndices[ 0 ] >= 0 && psIndices->GainsIndices[ 0 ] < N_LEVELS_QGAIN );
        ec_enc_icdf( psRangeEnc, silk_RSHIFT( psIndices->GainsIndices[ 0 ], 3 ), silk_gain_iCDF[ psIndices->signalType ], 8 );
        ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ 0 ] & 7, silk_uniform8_iCDF, 8 );
    }

    /* remaining subframes */
    for( i = 1; i < psEncC->nb_subfr; i++ ) {
        silk_assert( psIndices->GainsIndices[ i ] >= 0 && psIndices->GainsIndices[ i ] < MAX_DELTA_GAIN_QUANT - MIN_DELTA_GAIN_QUANT + 1 );
        ec_enc_icdf( psRangeEnc, psIndices->GainsIndices[ i ], silk_delta_gain_iCDF, 8 );
    }

    /****************/
    /* Encode NLSFs */
    /****************/
    ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ 0 ], &psEncC->psNLSF_CB->CB1_iCDF[ ( psIndices->signalType >> 1 ) * psEncC->psNLSF_CB->nVectors ], 8 );
    silk_NLSF_unpack( ec_ix, pred_Q8, psEncC->psNLSF_CB, psIndices->NLSFIndices[ 0 ] );
    silk_assert( psEncC->psNLSF_CB->order == psEncC->predictLPCOrder );
    for( i = 0; i < psEncC->psNLSF_CB->order; i++ ) {
        if( psIndices->NLSFIndices[ i+1 ] >= NLSF_QUANT_MAX_AMPLITUDE ) {
            ec_enc_icdf( psRangeEnc, 2 * NLSF_QUANT_MAX_AMPLITUDE, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
            ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ i+1 ] - NLSF_QUANT_MAX_AMPLITUDE, silk_NLSF_EXT_iCDF, 8 );
        } else if( psIndices->NLSFIndices[ i+1 ] <= -NLSF_QUANT_MAX_AMPLITUDE ) {
            ec_enc_icdf( psRangeEnc, 0, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
            ec_enc_icdf( psRangeEnc, -psIndices->NLSFIndices[ i+1 ] - NLSF_QUANT_MAX_AMPLITUDE, silk_NLSF_EXT_iCDF, 8 );
        } else {
            ec_enc_icdf( psRangeEnc, psIndices->NLSFIndices[ i+1 ] + NLSF_QUANT_MAX_AMPLITUDE, &psEncC->psNLSF_CB->ec_iCDF[ ec_ix[ i ] ], 8 );
        }
    }

    /* Encode NLSF interpolation factor */
    if( psEncC->nb_subfr == MAX_NB_SUBFR ) {
        silk_assert( psIndices->NLSFInterpCoef_Q2 >= 0 && psIndices->NLSFInterpCoef_Q2 < 5 );
        ec_enc_icdf( psRangeEnc, psIndices->NLSFInterpCoef_Q2, silk_NLSF_interpolation_factor_iCDF, 8 );
    }

    if( psIndices->signalType == TYPE_VOICED )
    {
        /*********************/
        /* Encode pitch lags */
        /*********************/
        /* lag index */
        encode_absolute_lagIndex = 1;
        if( condCoding == CODE_CONDITIONALLY && psEncC->ec_prevSignalType == TYPE_VOICED ) {
            /* Delta Encoding */
            delta_lagIndex = psIndices->lagIndex - psEncC->ec_prevLagIndex;
            if( delta_lagIndex < -8 || delta_lagIndex > 11 ) {
                delta_lagIndex = 0;
            } else {
                delta_lagIndex = delta_lagIndex + 9;
                encode_absolute_lagIndex = 0; /* Only use delta */
            }
            silk_assert( delta_lagIndex >= 0 && delta_lagIndex < 21 );
            ec_enc_icdf( psRangeEnc, delta_lagIndex, silk_pitch_delta_iCDF, 8 );
        }
        if( encode_absolute_lagIndex ) {
            /* Absolute encoding */
            opus_int32 pitch_high_bits, pitch_low_bits;
            pitch_high_bits = silk_DIV32_16( psIndices->lagIndex, silk_RSHIFT( psEncC->fs_kHz, 1 ) );
            pitch_low_bits = psIndices->lagIndex - silk_SMULBB( pitch_high_bits, silk_RSHIFT( psEncC->fs_kHz, 1 ) );
            silk_assert( pitch_low_bits < psEncC->fs_kHz / 2 );
            silk_assert( pitch_high_bits < 32 );
            ec_enc_icdf( psRangeEnc, pitch_high_bits, silk_pitch_lag_iCDF, 8 );
            ec_enc_icdf( psRangeEnc, pitch_low_bits, psEncC->pitch_lag_low_bits_iCDF, 8 );
        }
        psEncC->ec_prevLagIndex = psIndices->lagIndex;

        /* Countour index */
        silk_assert(   psIndices->contourIndex  >= 0 );
        silk_assert( ( psIndices->contourIndex < 34 && psEncC->fs_kHz  > 8 && psEncC->nb_subfr == 4 ) ||
                    ( psIndices->contourIndex < 11 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 4 ) ||
                    ( psIndices->contourIndex < 12 && psEncC->fs_kHz  > 8 && psEncC->nb_subfr == 2 ) ||
                    ( psIndices->contourIndex <  3 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 2 ) );
        ec_enc_icdf( psRangeEnc, psIndices->contourIndex, psEncC->pitch_contour_iCDF, 8 );

        /********************/
        /* Encode LTP gains */
        /********************/
        /* PERIndex value */
        silk_assert( psIndices->PERIndex >= 0 && psIndices->PERIndex < 3 );
        ec_enc_icdf( psRangeEnc, psIndices->PERIndex, silk_LTP_per_index_iCDF, 8 );

        /* Codebook Indices */
        for( k = 0; k < psEncC->nb_subfr; k++ ) {
            silk_assert( psIndices->LTPIndex[ k ] >= 0 && psIndices->LTPIndex[ k ] < ( 8 << psIndices->PERIndex ) );
            ec_enc_icdf( psRangeEnc, psIndices->LTPIndex[ k ], silk_LTP_gain_iCDF_ptrs[ psIndices->PERIndex ], 8 );
        }

        /**********************/
        /* Encode LTP scaling */
        /**********************/
        if( condCoding == CODE_INDEPENDENTLY ) {
            silk_assert( psIndices->LTP_scaleIndex >= 0 && psIndices->LTP_scaleIndex < 3 );
            ec_enc_icdf( psRangeEnc, psIndices->LTP_scaleIndex, silk_LTPscale_iCDF, 8 );
        }
        silk_assert( !condCoding || psIndices->LTP_scaleIndex == 0 );
    }

    psEncC->ec_prevSignalType = psIndices->signalType;

    /***************/
    /* Encode seed */
    /***************/
    silk_assert( psIndices->Seed >= 0 && psIndices->Seed < 4 );
    ec_enc_icdf( psRangeEnc, psIndices->Seed, silk_uniform4_iCDF, 8 );
}