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93 lines
4.7 KiB
93 lines
4.7 KiB
/*********************************************************************** |
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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_int32 NLSF_Q15_tmp; |
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const opus_uint8 *pCB_element; |
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const opus_int16 *pCB_Wght_Q9; |
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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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/* Apply inverse square-rooted weights to first stage and add to output */ |
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pCB_element = &psNLSF_CB->CB1_NLSF_Q8[ NLSFIndices[ 0 ] * psNLSF_CB->order ]; |
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pCB_Wght_Q9 = &psNLSF_CB->CB1_Wght_Q9[ NLSFIndices[ 0 ] * psNLSF_CB->order ]; |
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for( i = 0; i < psNLSF_CB->order; i++ ) { |
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NLSF_Q15_tmp = silk_ADD_LSHIFT32( silk_DIV32_16( silk_LSHIFT( (opus_int32)res_Q10[ i ], 14 ), pCB_Wght_Q9[ i ] ), (opus_int16)pCB_element[ i ], 7 ); |
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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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