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

Copyright (c) 2006-2011, Skype Limited. All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions

are met:

- Redistributions of source code must retain the above copyright notice,

this list of conditions and the following disclaimer.

- Redistributions in binary form must reproduce the above copyright

notice, this list of conditions and the following disclaimer in the

documentation and/or other materials provided with the distribution.

names of specific contributors, may be used to endorse or promote

products derived from this software without specific prior written

permission.

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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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

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

#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;

celt_assert( typeOffset >= 0 && typeOffset < 6 );

celt_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 ] );

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 );

}