ref: c77b96333b471c7b8a89852ee941e6a8987751b4
dir: /silk/SKP_Silk_NLSF_encode.c/
/***********************************************************************
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***********************************************************************/
#include "SKP_Silk_main.h"
#define STORE_LSF_DATA_FOR_TRAINING 0
/***********************/
/* NLSF vector encoder */
/***********************/
SKP_int32 SKP_Silk_NLSF_encode( /* O Returns RD value in Q25 */
SKP_int8 *NLSFIndices, /* I Codebook path vector [ LPC_ORDER + 1 ] */
SKP_int16 *pNLSF_Q15, /* I/O Quantized NLSF vector [ LPC_ORDER ] */
const SKP_Silk_NLSF_CB_struct *psNLSF_CB, /* I Codebook object */
const SKP_int16 *pW_Q5, /* I NLSF weight vector [ LPC_ORDER ] */
const SKP_int NLSF_mu_Q20, /* I Rate weight for the RD optimization */
const SKP_int nSurvivors, /* I Max survivors after first stage */
const SKP_int signalType /* I Signal type: 0/1/2 */
)
{
SKP_int i, s, ind1, bestIndex, prob_Q8, bits_q7;
SKP_int32 W_tmp_Q9;
SKP_int32 err_Q26[ NLSF_VQ_MAX_VECTORS ];
SKP_int32 RD_Q25[ NLSF_VQ_MAX_SURVIVORS ];
SKP_int tempIndices1[ NLSF_VQ_MAX_SURVIVORS ];
SKP_int8 tempIndices2[ NLSF_VQ_MAX_SURVIVORS * MAX_LPC_ORDER ];
SKP_int16 res_Q15[ MAX_LPC_ORDER ];
SKP_int16 res_Q10[ MAX_LPC_ORDER ];
SKP_int16 NLSF_tmp_Q15[ MAX_LPC_ORDER ];
SKP_int16 W_tmp_Q5[ MAX_LPC_ORDER ];
SKP_int16 W_adj_Q5[ MAX_LPC_ORDER ];
SKP_uint8 pred_Q8[ MAX_LPC_ORDER ];
SKP_int16 ec_ix[ MAX_LPC_ORDER ];
const SKP_uint8 *pCB_element, *iCDF_ptr;
#if STORE_LSF_DATA_FOR_TRAINING
SKP_int16 pNLSF_Q15_orig[MAX_LPC_ORDER ];
DEBUG_STORE_DATA( NLSF.dat, pNLSF_Q15, psNLSF_CB->order * sizeof( SKP_int16 ) );
DEBUG_STORE_DATA( WNLSF.dat, pW_Q5, psNLSF_CB->order * sizeof( SKP_int16 ) );
DEBUG_STORE_DATA( NLSF_mu.dat, &NLSF_mu_Q20, sizeof( SKP_int ) );
DEBUG_STORE_DATA( sigType.dat, &signalType, sizeof( SKP_int ) );
SKP_memcpy(pNLSF_Q15_orig, pNLSF_Q15, sizeof( pNLSF_Q15_orig ));
#endif
SKP_assert( nSurvivors <= NLSF_VQ_MAX_SURVIVORS );
SKP_assert( signalType >= 0 && signalType <= 2 );
SKP_assert( NLSF_mu_Q20 <= 32767 && NLSF_mu_Q20 >= 0 );
/* NLSF stabilization */
SKP_Silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->deltaMin_Q15, psNLSF_CB->order );
/* First stage: VQ */
SKP_Silk_NLSF_VQ( err_Q26, pNLSF_Q15, psNLSF_CB->CB1_NLSF_Q8, psNLSF_CB->nVectors, psNLSF_CB->order );
/* Sort the quantization errors */
SKP_Silk_insertion_sort_increasing( err_Q26, tempIndices1, psNLSF_CB->nVectors, nSurvivors );
/* Loop over survivors */
for( s = 0; s < nSurvivors; s++ ) {
ind1 = tempIndices1[ s ];
/* Residual after first stage */
pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ ind1 * psNLSF_CB->order ];
for( i = 0; i < psNLSF_CB->order; i++ ) {
NLSF_tmp_Q15[ i ] = SKP_LSHIFT16( ( SKP_int16 )pCB_element[ i ], 7 );
res_Q15[ i ] = pNLSF_Q15[ i ] - NLSF_tmp_Q15[ i ];
}
/* Weights from codebook vector */
SKP_Silk_NLSF_VQ_weights_laroia( W_tmp_Q5, NLSF_tmp_Q15, psNLSF_CB->order );
/* Apply square-rooted weights */
for( i = 0; i < psNLSF_CB->order; i++ ) {
W_tmp_Q9 = SKP_Silk_SQRT_APPROX( SKP_LSHIFT( ( SKP_int32 )W_tmp_Q5[ i ], 13 ) );
res_Q10[ i ] = ( SKP_int16 )SKP_RSHIFT( SKP_SMULBB( res_Q15[ i ], W_tmp_Q9 ), 14 );
}
/* Modify input weights accordingly */
for( i = 0; i < psNLSF_CB->order; i++ ) {
W_adj_Q5[ i ] = SKP_DIV32_16( SKP_LSHIFT( ( SKP_int32 )pW_Q5[ i ], 5 ), W_tmp_Q5[ i ] );
}
/* Unpack entropy table indices and predictor for current CB1 index */
SKP_Silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, ind1 );
/* Trellis quantizer */
RD_Q25[ s ] = SKP_Silk_NLSF_del_dec_quant( &tempIndices2[ s * MAX_LPC_ORDER ], res_Q10, W_adj_Q5, pred_Q8, ec_ix,
psNLSF_CB->ec_Rates_Q5, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->invQuantStepSize_Q6, NLSF_mu_Q20, psNLSF_CB->order );
/* Add rate for first stage */
iCDF_ptr = &psNLSF_CB->CB1_iCDF[ ( signalType >> 1 ) * psNLSF_CB->nVectors ];
if( ind1 == 0 ) {
prob_Q8 = 256 - iCDF_ptr[ ind1 ];
} else {
prob_Q8 = iCDF_ptr[ ind1 - 1 ] - iCDF_ptr[ ind1 ];
}
bits_q7 = ( 8 << 7 ) - SKP_Silk_lin2log( prob_Q8 );
RD_Q25[ s ] = SKP_SMLABB( RD_Q25[ s ], bits_q7, SKP_RSHIFT( NLSF_mu_Q20, 2 ) );
}
/* Find the lowest rate-distortion error */
SKP_Silk_insertion_sort_increasing( RD_Q25, &bestIndex, nSurvivors, 1 );
NLSFIndices[ 0 ] = ( SKP_int8 )tempIndices1[ bestIndex ];
SKP_memcpy( &NLSFIndices[ 1 ], &tempIndices2[ bestIndex * MAX_LPC_ORDER ], psNLSF_CB->order * sizeof( SKP_int8 ) );
/* Decode */
SKP_Silk_NLSF_decode( pNLSF_Q15, NLSFIndices, psNLSF_CB );
#if STORE_LSF_DATA_FOR_TRAINING
{
/* code for training the codebooks */
SKP_int32 RD_dec_Q22, Dist_Q22_dec, Rate_Q7, diff_Q15;
ind1 = NLSFIndices[ 0 ];
SKP_Silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, ind1 );
pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ ind1 * psNLSF_CB->order ];
for( i = 0; i < psNLSF_CB->order; i++ ) {
NLSF_tmp_Q15[ i ] = SKP_LSHIFT16( ( SKP_int16 )pCB_element[ i ], 7 );
}
SKP_Silk_NLSF_VQ_weights_laroia( W_tmp_Q5, NLSF_tmp_Q15, psNLSF_CB->order );
for( i = 0; i < psNLSF_CB->order; i++ ) {
W_tmp_Q9 = SKP_Silk_SQRT_APPROX( SKP_LSHIFT( ( SKP_int32 )W_tmp_Q5[ i ], 13 ) );
res_Q15[ i ] = pNLSF_Q15_orig[ i ] - NLSF_tmp_Q15[ i ];
res_Q10[ i ] = (SKP_int16)SKP_RSHIFT( SKP_SMULBB( res_Q15[ i ], W_tmp_Q9 ), 14 );
DEBUG_STORE_DATA( NLSF_res_q10.dat, &res_Q10[ i ], sizeof( SKP_int16 ) );
res_Q15[ i ] = pNLSF_Q15[ i ] - NLSF_tmp_Q15[ i ];
res_Q10[ i ] = (SKP_int16)SKP_RSHIFT( SKP_SMULBB( res_Q15[ i ], W_tmp_Q9 ), 14 );
DEBUG_STORE_DATA( NLSF_resq_q10.dat, &res_Q10[ i ], sizeof( SKP_int16 ) );
}
Dist_Q22_dec = 0;
for( i = 0; i < psNLSF_CB->order; i++ ) {
diff_Q15 = pNLSF_Q15_orig[ i ] - pNLSF_Q15[ i ];
Dist_Q22_dec += ( ( (diff_Q15 >> 5) * (diff_Q15 >> 5) ) * pW_Q5[ i ] ) >> 3;
}
iCDF_ptr = &psNLSF_CB->CB1_iCDF[ ( signalType >> 1 ) * psNLSF_CB->nVectors ];
if( ind1 == 0 ) {
prob_Q8 = 256 - iCDF_ptr[ ind1 ];
} else {
prob_Q8 = iCDF_ptr[ ind1 - 1 ] - iCDF_ptr[ ind1 ];
}
Rate_Q7 = ( 8 << 7 ) - SKP_Silk_lin2log( prob_Q8 );
for( i = 0; i < psNLSF_CB->order; i++ ) {
Rate_Q7 += ((int)psNLSF_CB->ec_Rates_Q5[ ec_ix[ i ] + SKP_LIMIT( NLSFIndices[ i + 1 ] + NLSF_QUANT_MAX_AMPLITUDE, 0, 2 * NLSF_QUANT_MAX_AMPLITUDE ) ] ) << 2;
if( SKP_abs( NLSFIndices[ i + 1 ] ) >= NLSF_QUANT_MAX_AMPLITUDE ) {
Rate_Q7 += 128 << ( SKP_abs( NLSFIndices[ i + 1 ] ) - NLSF_QUANT_MAX_AMPLITUDE );
}
}
RD_dec_Q22 = Dist_Q22_dec + Rate_Q7 * NLSF_mu_Q20 >> 5;
DEBUG_STORE_DATA( dec_dist_q22.dat, &Dist_Q22_dec, sizeof( SKP_int32 ) );
DEBUG_STORE_DATA( dec_rate_q7.dat, &Rate_Q7, sizeof( SKP_int32 ) );
DEBUG_STORE_DATA( dec_rd_q22.dat, &RD_dec_Q22, sizeof( SKP_int32 ) );
}
DEBUG_STORE_DATA( NLSF_ind.dat, NLSFIndices, (psNLSF_CB->order+1) * sizeof( SKP_int8 ) );
#endif
return RD_Q25[ 0 ];
}