/src/opus/silk/decode_parameters.c
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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 | | 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 | 0 | { |
41 | 0 | opus_int i, k, Ix; |
42 | 0 | opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], pNLSF0_Q15[ MAX_LPC_ORDER ]; |
43 | 0 | const opus_int8 *cbk_ptr_Q7; |
44 | | |
45 | | /* Dequant Gains */ |
46 | 0 | silk_gains_dequant( psDecCtrl->Gains_Q16, psDec->indices.GainsIndices, |
47 | 0 | &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 | 0 | } |
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 | 0 | pNLSF_Q15[ i ] - psDec->prevNLSF_Q15[ i ] ), 2 ); |
69 | 0 | } |
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 | 0 | } 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 | 0 | } |
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 | 0 | } |
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 | 0 | } |
102 | 0 | } |
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 | 0 | } 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 | 0 | } |
115 | 0 | } |