92 lines
4.5 KiB
C
92 lines
4.5 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, (subject to the limitations in the disclaimer below)
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are permitted provided that the following conditions 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 Skype Limited, nor the names of specific
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contributors, may be used to endorse or promote products derived from
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this software without specific prior written permission.
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NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#include "SKP_Silk_main.h"
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/* NLSF vector decoder */
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void SKP_Silk_NLSF_MSVQ_decode(
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SKP_int *pNLSF_Q15, /* O Pointer to decoded output vector [LPC_ORDER x 1] */
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const SKP_Silk_NLSF_CB_struct *psNLSF_CB, /* I Pointer to NLSF codebook struct */
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const SKP_int *NLSFIndices, /* I Pointer to NLSF indices [nStages x 1] */
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const SKP_int LPC_order /* I LPC order used */
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)
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{
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const SKP_int16 *pCB_element;
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SKP_int s;
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SKP_int i;
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/* Check that each index is within valid range */
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SKP_assert( 0 <= NLSFIndices[ 0 ] && NLSFIndices[ 0 ] < psNLSF_CB->CBStages[ 0 ].nVectors );
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/* Point to the first vector element */
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pCB_element = &psNLSF_CB->CBStages[ 0 ].CB_NLSF_Q15[ SKP_MUL( NLSFIndices[ 0 ], LPC_order ) ];
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/* Initialize with the codebook vector from stage 0 */
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for( i = 0; i < LPC_order; i++ ) {
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pNLSF_Q15[ i ] = ( SKP_int )pCB_element[ i ];
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}
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for( s = 1; s < psNLSF_CB->nStages; s++ ) {
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/* Check that each index is within valid range */
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SKP_assert( 0 <= NLSFIndices[ s ] && NLSFIndices[ s ] < psNLSF_CB->CBStages[ s ].nVectors );
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if( LPC_order == 16 ) {
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/* Point to the first vector element */
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pCB_element = &psNLSF_CB->CBStages[ s ].CB_NLSF_Q15[ SKP_LSHIFT( NLSFIndices[ s ], 4 ) ];
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/* Add the codebook vector from the current stage */
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pNLSF_Q15[ 0 ] += pCB_element[ 0 ];
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pNLSF_Q15[ 1 ] += pCB_element[ 1 ];
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pNLSF_Q15[ 2 ] += pCB_element[ 2 ];
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pNLSF_Q15[ 3 ] += pCB_element[ 3 ];
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pNLSF_Q15[ 4 ] += pCB_element[ 4 ];
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pNLSF_Q15[ 5 ] += pCB_element[ 5 ];
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pNLSF_Q15[ 6 ] += pCB_element[ 6 ];
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pNLSF_Q15[ 7 ] += pCB_element[ 7 ];
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pNLSF_Q15[ 8 ] += pCB_element[ 8 ];
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pNLSF_Q15[ 9 ] += pCB_element[ 9 ];
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pNLSF_Q15[ 10 ] += pCB_element[ 10 ];
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pNLSF_Q15[ 11 ] += pCB_element[ 11 ];
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pNLSF_Q15[ 12 ] += pCB_element[ 12 ];
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pNLSF_Q15[ 13 ] += pCB_element[ 13 ];
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pNLSF_Q15[ 14 ] += pCB_element[ 14 ];
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pNLSF_Q15[ 15 ] += pCB_element[ 15 ];
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} else {
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/* Point to the first vector element */
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pCB_element = &psNLSF_CB->CBStages[ s ].CB_NLSF_Q15[ SKP_SMULBB( NLSFIndices[ s ], LPC_order ) ];
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/* Add the codebook vector from the current stage */
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for( i = 0; i < LPC_order; i++ ) {
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pNLSF_Q15[ i ] += pCB_element[ i ];
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}
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}
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}
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/* NLSF stabilization */
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SKP_Silk_NLSF_stabilize( pNLSF_Q15, psNLSF_CB->NDeltaMin_Q15, LPC_order );
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}
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