Line data Source code
1 : /***********************************************************************
2 : Copyright (c) 2006-2011, Skype Limited. All rights reserved.
3 : Redistribution and use in source and binary forms, with or without
4 : modification, are permitted provided that the following conditions
5 : are met:
6 : - Redistributions of source code must retain the above copyright notice,
7 : this list of conditions and the following disclaimer.
8 : - Redistributions in binary form must reproduce the above copyright
9 : notice, this list of conditions and the following disclaimer in the
10 : documentation and/or other materials provided with the distribution.
11 : - Neither the name of Internet Society, IETF or IETF Trust, nor the
12 : names of specific contributors, may be used to endorse or promote
13 : products derived from this software without specific prior written
14 : permission.
15 : THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 : AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 : IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 : ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
19 : LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 : CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 : SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 : INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 : CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 : ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 : POSSIBILITY OF SUCH DAMAGE.
26 : ***********************************************************************/
27 :
28 : #ifdef HAVE_CONFIG_H
29 : #include "config.h"
30 : #endif
31 :
32 : #include "main.h"
33 :
34 : /* Decode parameters from payload */
35 0 : void silk_decode_parameters(
36 : silk_decoder_state *psDec, /* I/O State */
37 : silk_decoder_control *psDecCtrl, /* I/O Decoder control */
38 : opus_int condCoding /* I The type of conditional coding to use */
39 : )
40 : {
41 : opus_int i, k, Ix;
42 : opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], pNLSF0_Q15[ MAX_LPC_ORDER ];
43 : const opus_int8 *cbk_ptr_Q7;
44 :
45 : /* Dequant Gains */
46 0 : silk_gains_dequant( psDecCtrl->Gains_Q16, psDec->indices.GainsIndices,
47 : &psDec->LastGainIndex, condCoding == CODE_CONDITIONALLY, psDec->nb_subfr );
48 :
49 : /****************/
50 : /* Decode NLSFs */
51 : /****************/
52 0 : silk_NLSF_decode( pNLSF_Q15, psDec->indices.NLSFIndices, psDec->psNLSF_CB );
53 :
54 : /* Convert NLSF parameters to AR prediction filter coefficients */
55 0 : silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psDec->LPC_order, psDec->arch );
56 :
57 : /* If just reset, e.g., because internal Fs changed, do not allow interpolation */
58 : /* improves the case of packet loss in the first frame after a switch */
59 0 : if( psDec->first_frame_after_reset == 1 ) {
60 0 : psDec->indices.NLSFInterpCoef_Q2 = 4;
61 : }
62 :
63 0 : if( psDec->indices.NLSFInterpCoef_Q2 < 4 ) {
64 : /* Calculation of the interpolated NLSF0 vector from the interpolation factor, */
65 : /* the previous NLSF1, and the current NLSF1 */
66 0 : for( i = 0; i < psDec->LPC_order; i++ ) {
67 0 : pNLSF0_Q15[ i ] = psDec->prevNLSF_Q15[ i ] + silk_RSHIFT( silk_MUL( psDec->indices.NLSFInterpCoef_Q2,
68 : pNLSF_Q15[ i ] - psDec->prevNLSF_Q15[ i ] ), 2 );
69 : }
70 :
71 : /* Convert NLSF parameters to AR prediction filter coefficients */
72 0 : silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 0 ], pNLSF0_Q15, psDec->LPC_order, psDec->arch );
73 : } else {
74 : /* Copy LPC coefficients for first half from second half */
75 0 : silk_memcpy( psDecCtrl->PredCoef_Q12[ 0 ], psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) );
76 : }
77 :
78 0 : silk_memcpy( psDec->prevNLSF_Q15, pNLSF_Q15, psDec->LPC_order * sizeof( opus_int16 ) );
79 :
80 : /* After a packet loss do BWE of LPC coefs */
81 0 : if( psDec->lossCnt ) {
82 0 : silk_bwexpander( psDecCtrl->PredCoef_Q12[ 0 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
83 0 : silk_bwexpander( psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 );
84 : }
85 :
86 0 : if( psDec->indices.signalType == TYPE_VOICED ) {
87 : /*********************/
88 : /* Decode pitch lags */
89 : /*********************/
90 :
91 : /* Decode pitch values */
92 0 : silk_decode_pitch( psDec->indices.lagIndex, psDec->indices.contourIndex, psDecCtrl->pitchL, psDec->fs_kHz, psDec->nb_subfr );
93 :
94 : /* Decode Codebook Index */
95 0 : cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ psDec->indices.PERIndex ]; /* set pointer to start of codebook */
96 :
97 0 : for( k = 0; k < psDec->nb_subfr; k++ ) {
98 0 : Ix = psDec->indices.LTPIndex[ k ];
99 0 : for( i = 0; i < LTP_ORDER; i++ ) {
100 0 : psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER + i ] = silk_LSHIFT( cbk_ptr_Q7[ Ix * LTP_ORDER + i ], 7 );
101 : }
102 : }
103 :
104 : /**********************/
105 : /* Decode LTP scaling */
106 : /**********************/
107 0 : Ix = psDec->indices.LTP_scaleIndex;
108 0 : psDecCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ Ix ];
109 : } else {
110 0 : silk_memset( psDecCtrl->pitchL, 0, psDec->nb_subfr * sizeof( opus_int ) );
111 0 : silk_memset( psDecCtrl->LTPCoef_Q14, 0, LTP_ORDER * psDec->nb_subfr * sizeof( opus_int16 ) );
112 0 : psDec->indices.PERIndex = 0;
113 0 : psDecCtrl->LTP_scale_Q14 = 0;
114 : }
115 0 : }
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