diff options
Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/decode_parameters.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/decode_parameters.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/decode_parameters.c b/lib/rbcodec/codecs/libopus/silk/decode_parameters.c new file mode 100644 index 0000000000..f7c6e2f112 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/decode_parameters.c | |||
@@ -0,0 +1,115 @@ | |||
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 "opus_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 | { | ||
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 | 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 | silk_NLSF_decode( pNLSF_Q15, psDec->indices.NLSFIndices, psDec->psNLSF_CB ); | ||
53 | |||
54 | /* Convert NLSF parameters to AR prediction filter coefficients */ | ||
55 | silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psDec->LPC_order ); | ||
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 | if( psDec->first_frame_after_reset == 1 ) { | ||
60 | psDec->indices.NLSFInterpCoef_Q2 = 4; | ||
61 | } | ||
62 | |||
63 | 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 | for( i = 0; i < psDec->LPC_order; i++ ) { | ||
67 | 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 | silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 0 ], pNLSF0_Q15, psDec->LPC_order ); | ||
73 | } else { | ||
74 | /* Copy LPC coefficients for first half from second half */ | ||
75 | silk_memcpy( psDecCtrl->PredCoef_Q12[ 0 ], psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) ); | ||
76 | } | ||
77 | |||
78 | 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 | if( psDec->lossCnt ) { | ||
82 | silk_bwexpander( psDecCtrl->PredCoef_Q12[ 0 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 ); | ||
83 | silk_bwexpander( psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 ); | ||
84 | } | ||
85 | |||
86 | if( psDec->indices.signalType == TYPE_VOICED ) { | ||
87 | /*********************/ | ||
88 | /* Decode pitch lags */ | ||
89 | /*********************/ | ||
90 | |||
91 | /* Decode pitch values */ | ||
92 | silk_decode_pitch( psDec->indices.lagIndex, psDec->indices.contourIndex, psDecCtrl->pitchL, psDec->fs_kHz, psDec->nb_subfr ); | ||
93 | |||
94 | /* Decode Codebook Index */ | ||
95 | cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ psDec->indices.PERIndex ]; /* set pointer to start of codebook */ | ||
96 | |||
97 | for( k = 0; k < psDec->nb_subfr; k++ ) { | ||
98 | Ix = psDec->indices.LTPIndex[ k ]; | ||
99 | for( i = 0; i < LTP_ORDER; i++ ) { | ||
100 | 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 | Ix = psDec->indices.LTP_scaleIndex; | ||
108 | psDecCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ Ix ]; | ||
109 | } else { | ||
110 | silk_memset( psDecCtrl->pitchL, 0, psDec->nb_subfr * sizeof( opus_int ) ); | ||
111 | silk_memset( psDecCtrl->LTPCoef_Q14, 0, LTP_ORDER * psDec->nb_subfr * sizeof( opus_int16 ) ); | ||
112 | psDec->indices.PERIndex = 0; | ||
113 | psDecCtrl->LTP_scale_Q14 = 0; | ||
114 | } | ||
115 | } | ||