ref: bc2eebdf46a7de8b2927a0144dfd65bead6f1f15
dir: /silk/NLSF_del_dec_quant.c/
/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, (subject to the limitations in the disclaimer below)
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.
- Neither the name of Skype Limited, nor the names of specific
contributors, may be used to endorse or promote products derived from
this software without specific prior written permission.
NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
BY THIS LICENSE. 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 CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN 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"
/* Delayed-decision quantizer for NLSF residuals */
opus_int32 silk_NLSF_del_dec_quant( /* O Returns RD value in Q25 */
opus_int8 indices[], /* O Quantization indices [ order ] */
const opus_int16 x_Q10[], /* I Input [ order ] */
const opus_int16 w_Q5[], /* I Weights [ order ] */
const opus_uint8 pred_coef_Q8[], /* I Backward predictor coefs [ order ] */
const opus_int16 ec_ix[], /* I Indices to entropy coding tables [ order ] */
const opus_uint8 ec_rates_Q5[], /* I Rates [] */
const opus_int quant_step_size_Q16, /* I Quantization step size */
const opus_int16 inv_quant_step_size_Q6, /* I Inverse quantization step size */
const opus_int32 mu_Q20, /* I R/D tradeoff */
const opus_int16 order /* I Number of input values */
)
{
opus_int i, j, nStates, ind_tmp, ind_min_max, ind_max_min, in_Q10, res_Q10;
opus_int pred_Q10, diff_Q10, out0_Q10, out1_Q10, rate0_Q5, rate1_Q5;
opus_int32 RD_tmp_Q25, min_Q25, min_max_Q25, max_min_Q25, pred_coef_Q16;
opus_int ind_sort[ NLSF_QUANT_DEL_DEC_STATES ];
opus_int8 ind[ NLSF_QUANT_DEL_DEC_STATES ][ MAX_LPC_ORDER ];
opus_int16 prev_out_Q10[ 2 * NLSF_QUANT_DEL_DEC_STATES ];
opus_int32 RD_Q25[ 2 * NLSF_QUANT_DEL_DEC_STATES ];
opus_int32 RD_min_Q25[ NLSF_QUANT_DEL_DEC_STATES ];
opus_int32 RD_max_Q25[ NLSF_QUANT_DEL_DEC_STATES ];
const opus_uint8 *rates_Q5;
silk_assert( (NLSF_QUANT_DEL_DEC_STATES & (NLSF_QUANT_DEL_DEC_STATES-1)) == 0 ); /* must be power of two */
nStates = 1;
RD_Q25[ 0 ] = 0;
prev_out_Q10[ 0 ] = 0;
for( i = order - 1; ; i-- ) {
rates_Q5 = &ec_rates_Q5[ ec_ix[ i ] ];
pred_coef_Q16 = silk_LSHIFT( (opus_int32)pred_coef_Q8[ i ], 8 );
in_Q10 = x_Q10[ i ];
for( j = 0; j < nStates; j++ ) {
pred_Q10 = silk_SMULWB( pred_coef_Q16, prev_out_Q10[ j ] );
res_Q10 = silk_SUB16( in_Q10, pred_Q10 );
ind_tmp = silk_SMULWB( inv_quant_step_size_Q6, res_Q10 );
ind_tmp = silk_LIMIT( ind_tmp, -NLSF_QUANT_MAX_AMPLITUDE_EXT, NLSF_QUANT_MAX_AMPLITUDE_EXT-1 );
ind[ j ][ i ] = (opus_int8)ind_tmp;
/* compute outputs for ind_tmp and ind_tmp + 1 */
out0_Q10 = silk_LSHIFT( ind_tmp, 10 );
out1_Q10 = silk_ADD16( out0_Q10, 1024 );
if( ind_tmp > 0 ) {
out0_Q10 = silk_SUB16( out0_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
out1_Q10 = silk_SUB16( out1_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
} else if( ind_tmp == 0 ) {
out1_Q10 = silk_SUB16( out1_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
} else if( ind_tmp == -1 ) {
out0_Q10 = silk_ADD16( out0_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
} else {
out0_Q10 = silk_ADD16( out0_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
out1_Q10 = silk_ADD16( out1_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
}
out0_Q10 = silk_SMULWB( out0_Q10, quant_step_size_Q16 );
out1_Q10 = silk_SMULWB( out1_Q10, quant_step_size_Q16 );
out0_Q10 = silk_ADD16( out0_Q10, pred_Q10 );
out1_Q10 = silk_ADD16( out1_Q10, pred_Q10 );
prev_out_Q10[ j ] = out0_Q10;
prev_out_Q10[ j + nStates ] = out1_Q10;
/* compute RD for ind_tmp and ind_tmp + 1 */
if( ind_tmp + 1 >= NLSF_QUANT_MAX_AMPLITUDE ) {
if( ind_tmp + 1 == NLSF_QUANT_MAX_AMPLITUDE ) {
rate0_Q5 = rates_Q5[ ind_tmp + NLSF_QUANT_MAX_AMPLITUDE ];
rate1_Q5 = 280;
} else {
rate0_Q5 = silk_SMLABB( 280 - 43 * NLSF_QUANT_MAX_AMPLITUDE, 43, ind_tmp );
rate1_Q5 = silk_ADD16( rate0_Q5, 43 );
}
} else if( ind_tmp <= -NLSF_QUANT_MAX_AMPLITUDE ) {
if( ind_tmp == -NLSF_QUANT_MAX_AMPLITUDE ) {
rate0_Q5 = 280;
rate1_Q5 = rates_Q5[ ind_tmp + 1 + NLSF_QUANT_MAX_AMPLITUDE ];
} else {
rate0_Q5 = silk_SMLABB( 280 - 43 * NLSF_QUANT_MAX_AMPLITUDE, -43, ind_tmp );
rate1_Q5 = silk_SUB16( rate0_Q5, 43 );
}
} else {
rate0_Q5 = rates_Q5[ ind_tmp + NLSF_QUANT_MAX_AMPLITUDE ];
rate1_Q5 = rates_Q5[ ind_tmp + 1 + NLSF_QUANT_MAX_AMPLITUDE ];
}
RD_tmp_Q25 = RD_Q25[ j ];
diff_Q10 = silk_SUB16( in_Q10, out0_Q10 );
RD_Q25[ j ] = silk_SMLABB( silk_MLA( RD_tmp_Q25, silk_SMULBB( diff_Q10, diff_Q10 ), w_Q5[ i ] ), mu_Q20, rate0_Q5 );
diff_Q10 = silk_SUB16( in_Q10, out1_Q10 );
RD_Q25[ j + nStates ] = silk_SMLABB( silk_MLA( RD_tmp_Q25, silk_SMULBB( diff_Q10, diff_Q10 ), w_Q5[ i ] ), mu_Q20, rate1_Q5 );
}
if( nStates < NLSF_QUANT_DEL_DEC_STATES ) {
/* double number of states and copy */
for( j = 0; j < nStates; j++ ) {
ind[ j + nStates ][ i ] = ind[ j ][ i ] + 1;
}
nStates = silk_LSHIFT( nStates, 1 );
for( j = nStates; j < NLSF_QUANT_DEL_DEC_STATES; j++ ) {
ind[ j ][ i ] = ind[ j - nStates ][ i ];
}
} else if( i > 0 ) {
/* sort lower and upper half of RD_Q25, pairwise */
for( j = 0; j < NLSF_QUANT_DEL_DEC_STATES; j++ ) {
if( RD_Q25[ j ] > RD_Q25[ j + NLSF_QUANT_DEL_DEC_STATES ] ) {
RD_max_Q25[ j ] = RD_Q25[ j ];
RD_min_Q25[ j ] = RD_Q25[ j + NLSF_QUANT_DEL_DEC_STATES ];
RD_Q25[ j ] = RD_min_Q25[ j ];
RD_Q25[ j + NLSF_QUANT_DEL_DEC_STATES ] = RD_max_Q25[ j ];
/* swap prev_out values */
out0_Q10 = prev_out_Q10[ j ];
prev_out_Q10[ j ] = prev_out_Q10[ j + NLSF_QUANT_DEL_DEC_STATES ];
prev_out_Q10[ j + NLSF_QUANT_DEL_DEC_STATES ] = out0_Q10;
ind_sort[ j ] = j + NLSF_QUANT_DEL_DEC_STATES;
} else {
RD_min_Q25[ j ] = RD_Q25[ j ];
RD_max_Q25[ j ] = RD_Q25[ j + NLSF_QUANT_DEL_DEC_STATES ];
ind_sort[ j ] = j;
}
}
/* compare the highest RD values of the winning half with the lowest one in the losing half, and copy if necessary */
/* afterwards ind_sort[] will contain the indices of the NLSF_QUANT_DEL_DEC_STATES winning RD values */
while( 1 ) {
min_max_Q25 = silk_int32_MAX;
max_min_Q25 = 0;
ind_min_max = 0;
ind_max_min = 0;
for( j = 0; j < NLSF_QUANT_DEL_DEC_STATES; j++ ) {
if( min_max_Q25 > RD_max_Q25[ j ] ) {
min_max_Q25 = RD_max_Q25[ j ];
ind_min_max = j;
}
if( max_min_Q25 < RD_min_Q25[ j ] ) {
max_min_Q25 = RD_min_Q25[ j ];
ind_max_min = j;
}
}
if( min_max_Q25 >= max_min_Q25 ) {
break;
}
/* copy ind_min_max to ind_max_min */
ind_sort[ ind_max_min ] = ind_sort[ ind_min_max ] ^ NLSF_QUANT_DEL_DEC_STATES;
RD_Q25[ ind_max_min ] = RD_Q25[ ind_min_max + NLSF_QUANT_DEL_DEC_STATES ];
prev_out_Q10[ ind_max_min ] = prev_out_Q10[ ind_min_max + NLSF_QUANT_DEL_DEC_STATES ];
RD_min_Q25[ ind_max_min ] = 0;
RD_max_Q25[ ind_min_max ] = silk_int32_MAX;
silk_memcpy( ind[ ind_max_min ], ind[ ind_min_max ], MAX_LPC_ORDER * sizeof( opus_int8 ) );
}
/* increment index if it comes from the upper half */
for( j = 0; j < NLSF_QUANT_DEL_DEC_STATES; j++ ) {
ind[ j ][ i ] += silk_RSHIFT( ind_sort[ j ], NLSF_QUANT_DEL_DEC_STATES_LOG2 );
}
} else { /* i == 0 */
break;
}
}
/* last sample: find winner, copy indices and return RD value */
ind_tmp = 0;
min_Q25 = silk_int32_MAX;
for( j = 0; j < 2 * NLSF_QUANT_DEL_DEC_STATES; j++ ) {
if( min_Q25 > RD_Q25[ j ] ) {
min_Q25 = RD_Q25[ j ];
ind_tmp = j;
}
}
for( j = 0; j < order; j++ ) {
indices[ j ] = ind[ ind_tmp & ( NLSF_QUANT_DEL_DEC_STATES - 1 ) ][ j ];
silk_assert( indices[ j ] >= -NLSF_QUANT_MAX_AMPLITUDE_EXT );
silk_assert( indices[ j ] <= NLSF_QUANT_MAX_AMPLITUDE_EXT );
}
indices[ 0 ] += silk_RSHIFT( ind_tmp, NLSF_QUANT_DEL_DEC_STATES_LOG2 );
silk_assert( indices[ 0 ] <= NLSF_QUANT_MAX_AMPLITUDE_EXT );
silk_assert( min_Q25 >= 0 );
return min_Q25;
}