102 lines
4.9 KiB
C
102 lines
4.9 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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/* Predictive dequantizer for NLSF residuals */
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static OPUS_INLINE void silk_NLSF_residual_dequant( /* O Returns RD value in Q30 */
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opus_int16 x_Q10[], /* O Output [ order ] */
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const opus_int8 indices[], /* I Quantization indices [ order ] */
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const opus_uint8 pred_coef_Q8[], /* I Backward predictor coefs [ order ] */
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const opus_int quant_step_size_Q16, /* I Quantization step size */
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const opus_int16 order /* I Number of input values */
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)
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{
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opus_int i, out_Q10, pred_Q10;
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out_Q10 = 0;
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for( i = order-1; i >= 0; i-- ) {
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pred_Q10 = silk_RSHIFT( silk_SMULBB( out_Q10, (opus_int16)pred_coef_Q8[ i ] ), 8 );
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out_Q10 = silk_LSHIFT( indices[ i ], 10 );
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if( out_Q10 > 0 ) {
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out_Q10 = silk_SUB16( out_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
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} else if( out_Q10 < 0 ) {
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out_Q10 = silk_ADD16( out_Q10, SILK_FIX_CONST( NLSF_QUANT_LEVEL_ADJ, 10 ) );
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}
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out_Q10 = silk_SMLAWB( pred_Q10, (opus_int32)out_Q10, quant_step_size_Q16 );
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x_Q10[ i ] = out_Q10;
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}
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}
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/***********************/
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/* NLSF vector decoder */
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/***********************/
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void silk_NLSF_decode(
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opus_int16 *pNLSF_Q15, /* O Quantized NLSF vector [ LPC_ORDER ] */
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opus_int8 *NLSFIndices, /* I Codebook path vector [ LPC_ORDER + 1 ] */
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const silk_NLSF_CB_struct *psNLSF_CB /* I Codebook object */
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)
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{
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opus_int i;
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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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opus_int16 res_Q10[ MAX_LPC_ORDER ];
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opus_int16 W_tmp_QW[ MAX_LPC_ORDER ];
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opus_int32 W_tmp_Q9, NLSF_Q15_tmp;
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const opus_uint8 *pCB_element;
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/* Decode first stage */
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pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ NLSFIndices[ 0 ] * psNLSF_CB->order ];
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for( i = 0; i < psNLSF_CB->order; i++ ) {
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pNLSF_Q15[ i ] = silk_LSHIFT( (opus_int16)pCB_element[ i ], 7 );
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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, NLSFIndices[ 0 ] );
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/* Predictive residual dequantizer */
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silk_NLSF_residual_dequant( res_Q10, &NLSFIndices[ 1 ], pred_Q8, psNLSF_CB->quantStepSize_Q16, psNLSF_CB->order );
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/* Weights from codebook vector */
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silk_NLSF_VQ_weights_laroia( W_tmp_QW, pNLSF_Q15, psNLSF_CB->order );
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/* Apply inverse square-rooted weights and add to output */
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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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NLSF_Q15_tmp = silk_ADD32( pNLSF_Q15[ i ], silk_DIV32_16( silk_LSHIFT( (opus_int32)res_Q10[ i ], 14 ), W_tmp_Q9 ) );
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pNLSF_Q15[ i ] = (opus_int16)silk_LIMIT( NLSF_Q15_tmp, 0, 32767 );
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}
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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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}
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