| /*********************************************************************** |
| Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
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| modification, (subject to the limitations in the disclaimer below) |
| are permitted provided that the following conditions are met: |
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| 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 |
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| ***********************************************************************/ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include "main.h" |
| |
| /* Unpack predictor values and indices for entropy coding tables */ |
| void silk_NLSF_unpack( |
| opus_int16 ec_ix[], /* O Indices to entropy tables [ LPC_ORDER ] */ |
| opus_uint8 pred_Q8[], /* O LSF predictor [ LPC_ORDER ] */ |
| const silk_NLSF_CB_struct *psNLSF_CB, /* I Codebook object */ |
| const opus_int CB1_index /* I Index of vector in first LSF codebook */ |
| ) |
| { |
| opus_int i; |
| opus_uint8 entry; |
| const opus_uint8 *ec_sel_ptr; |
| |
| ec_sel_ptr = &psNLSF_CB->ec_sel[ CB1_index * psNLSF_CB->order / 2 ]; |
| for( i = 0; i < psNLSF_CB->order; i += 2 ) { |
| entry = *ec_sel_ptr++; |
| ec_ix [ i ] = silk_SMULBB( silk_RSHIFT( entry, 1 ) & 7, 2 * NLSF_QUANT_MAX_AMPLITUDE + 1 ); |
| pred_Q8[ i ] = psNLSF_CB->pred_Q8[ i + ( entry & 1 ) * ( psNLSF_CB->order - 1 ) ]; |
| ec_ix [ i + 1 ] = silk_SMULBB( silk_RSHIFT( entry, 5 ) & 7, 2 * NLSF_QUANT_MAX_AMPLITUDE + 1 ); |
| pred_Q8[ i + 1 ] = psNLSF_CB->pred_Q8[ i + ( silk_RSHIFT( entry, 4 ) & 1 ) * ( psNLSF_CB->order - 1 ) + 1 ]; |
| } |
| } |
| |