137 lines
6.4 KiB
C
137 lines
6.4 KiB
C
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "main.h"
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#include "stack_alloc.h"
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/***********************/
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/* NLSF vector encoder */
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/***********************/
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opus_int32 silk_NLSF_encode( /* O Returns RD value in Q25 */
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opus_int8 *NLSFIndices, /* I Codebook path vector [ LPC_ORDER + 1 ] */
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opus_int16 *pNLSF_Q15, /* I/O Quantized NLSF vector [ LPC_ORDER ] */
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const silk_NLSF_CB_struct *psNLSF_CB, /* I Codebook object */
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const opus_int16 *pW_QW, /* I NLSF weight vector [ LPC_ORDER ] */
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const opus_int NLSF_mu_Q20, /* I Rate weight for the RD optimization */
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const opus_int nSurvivors, /* I Max survivors after first stage */
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const opus_int signalType /* I Signal type: 0/1/2 */
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)
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{
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opus_int i, s, ind1, bestIndex, prob_Q8, bits_q7;
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opus_int32 W_tmp_Q9;
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VARDECL( opus_int32, err_Q26 );
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VARDECL( opus_int32, RD_Q25 );
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VARDECL( opus_int, tempIndices1 );
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VARDECL( opus_int8, tempIndices2 );
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opus_int16 res_Q15[ MAX_LPC_ORDER ];
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opus_int16 res_Q10[ MAX_LPC_ORDER ];
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opus_int16 NLSF_tmp_Q15[ MAX_LPC_ORDER ];
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opus_int16 W_tmp_QW[ MAX_LPC_ORDER ];
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opus_int16 W_adj_Q5[ MAX_LPC_ORDER ];
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opus_uint8 pred_Q8[ MAX_LPC_ORDER ];
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opus_int16 ec_ix[ MAX_LPC_ORDER ];
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const opus_uint8 *pCB_element, *iCDF_ptr;
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SAVE_STACK;
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silk_assert( nSurvivors <= NLSF_VQ_MAX_SURVIVORS );
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silk_assert( signalType >= 0 && signalType <= 2 );
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silk_assert( NLSF_mu_Q20 <= 32767 && NLSF_mu_Q20 >= 0 );
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/* NLSF stabilization */
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silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->deltaMin_Q15, psNLSF_CB->order );
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/* First stage: VQ */
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ALLOC( err_Q26, psNLSF_CB->nVectors, opus_int32 );
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silk_NLSF_VQ( err_Q26, pNLSF_Q15, psNLSF_CB->CB1_NLSF_Q8, psNLSF_CB->nVectors, psNLSF_CB->order );
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/* Sort the quantization errors */
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ALLOC( tempIndices1, nSurvivors, opus_int );
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silk_insertion_sort_increasing( err_Q26, tempIndices1, psNLSF_CB->nVectors, nSurvivors );
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ALLOC( RD_Q25, nSurvivors, opus_int32 );
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ALLOC( tempIndices2, nSurvivors * MAX_LPC_ORDER, opus_int8 );
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/* Loop over survivors */
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for( s = 0; s < nSurvivors; s++ ) {
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ind1 = tempIndices1[ s ];
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/* Residual after first stage */
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pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ ind1 * psNLSF_CB->order ];
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for( i = 0; i < psNLSF_CB->order; i++ ) {
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NLSF_tmp_Q15[ i ] = silk_LSHIFT16( (opus_int16)pCB_element[ i ], 7 );
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res_Q15[ i ] = pNLSF_Q15[ i ] - NLSF_tmp_Q15[ i ];
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}
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/* Weights from codebook vector */
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silk_NLSF_VQ_weights_laroia( W_tmp_QW, NLSF_tmp_Q15, psNLSF_CB->order );
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/* Apply square-rooted weights */
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for( i = 0; i < psNLSF_CB->order; i++ ) {
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W_tmp_Q9 = silk_SQRT_APPROX( silk_LSHIFT( (opus_int32)W_tmp_QW[ i ], 18 - NLSF_W_Q ) );
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res_Q10[ i ] = (opus_int16)silk_RSHIFT( silk_SMULBB( res_Q15[ i ], W_tmp_Q9 ), 14 );
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}
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/* Modify input weights accordingly */
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for( i = 0; i < psNLSF_CB->order; i++ ) {
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W_adj_Q5[ i ] = silk_DIV32_16( silk_LSHIFT( (opus_int32)pW_QW[ i ], 5 ), W_tmp_QW[ i ] );
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}
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/* Unpack entropy table indices and predictor for current CB1 index */
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silk_NLSF_unpack( ec_ix, pred_Q8, psNLSF_CB, ind1 );
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/* Trellis quantizer */
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RD_Q25[ s ] = silk_NLSF_del_dec_quant( &tempIndices2[ s * MAX_LPC_ORDER ], res_Q10, W_adj_Q5, pred_Q8, ec_ix,
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psNLSF_CB->ec_Rates_Q5, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->invQuantStepSize_Q6, NLSF_mu_Q20, psNLSF_CB->order );
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/* Add rate for first stage */
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iCDF_ptr = &psNLSF_CB->CB1_iCDF[ ( signalType >> 1 ) * psNLSF_CB->nVectors ];
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if( ind1 == 0 ) {
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prob_Q8 = 256 - iCDF_ptr[ ind1 ];
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} else {
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prob_Q8 = iCDF_ptr[ ind1 - 1 ] - iCDF_ptr[ ind1 ];
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}
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bits_q7 = ( 8 << 7 ) - silk_lin2log( prob_Q8 );
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RD_Q25[ s ] = silk_SMLABB( RD_Q25[ s ], bits_q7, silk_RSHIFT( NLSF_mu_Q20, 2 ) );
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}
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/* Find the lowest rate-distortion error */
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silk_insertion_sort_increasing( RD_Q25, &bestIndex, nSurvivors, 1 );
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NLSFIndices[ 0 ] = (opus_int8)tempIndices1[ bestIndex ];
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silk_memcpy( &NLSFIndices[ 1 ], &tempIndices2[ bestIndex * MAX_LPC_ORDER ], psNLSF_CB->order * sizeof( opus_int8 ) );
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/* Decode */
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silk_NLSF_decode( pNLSF_Q15, NLSFIndices, psNLSF_CB );
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RESTORE_STACK;
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return RD_Q25[ 0 ];
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}
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