995dcb610c
Took the opportunity to undo the Godot changed made to the
opus source. The opus module should eventually be built in its
own environment to avoid polluting others with too many include
dirs and defines.
TODO: Fix the platform/ stuff for opus.
(cherry picked from commit d9a291f641)
speex module was only added while cherry-picking, as speex is removed
in the master branch but we don't want to break compatibility in 2.1.x.
Unbundling wasn't done as the module uses the internal speex_free,
so it would require some more work.
101 lines
4.9 KiB
C
101 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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