diff options
Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/process_NLSFs.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/process_NLSFs.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/process_NLSFs.c b/lib/rbcodec/codecs/libopus/silk/process_NLSFs.c new file mode 100644 index 0000000000..d130809541 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/process_NLSFs.c | |||
@@ -0,0 +1,107 @@ | |||
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 | /* Limit, stabilize, convert and quantize NLSFs */ | ||
35 | void silk_process_NLSFs( | ||
36 | silk_encoder_state *psEncC, /* I/O Encoder state */ | ||
37 | opus_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O Prediction coefficients */ | ||
38 | opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], /* I/O Normalized LSFs (quant out) (0 - (2^15-1)) */ | ||
39 | const opus_int16 prev_NLSFq_Q15[ MAX_LPC_ORDER ] /* I Previous Normalized LSFs (0 - (2^15-1)) */ | ||
40 | ) | ||
41 | { | ||
42 | opus_int i, doInterpolate; | ||
43 | opus_int NLSF_mu_Q20; | ||
44 | opus_int16 i_sqr_Q15; | ||
45 | opus_int16 pNLSF0_temp_Q15[ MAX_LPC_ORDER ]; | ||
46 | opus_int16 pNLSFW_QW[ MAX_LPC_ORDER ]; | ||
47 | opus_int16 pNLSFW0_temp_QW[ MAX_LPC_ORDER ]; | ||
48 | |||
49 | silk_assert( psEncC->speech_activity_Q8 >= 0 ); | ||
50 | silk_assert( psEncC->speech_activity_Q8 <= SILK_FIX_CONST( 1.0, 8 ) ); | ||
51 | celt_assert( psEncC->useInterpolatedNLSFs == 1 || psEncC->indices.NLSFInterpCoef_Q2 == ( 1 << 2 ) ); | ||
52 | |||
53 | /***********************/ | ||
54 | /* Calculate mu values */ | ||
55 | /***********************/ | ||
56 | /* NLSF_mu = 0.003 - 0.0015 * psEnc->speech_activity; */ | ||
57 | NLSF_mu_Q20 = silk_SMLAWB( SILK_FIX_CONST( 0.003, 20 ), SILK_FIX_CONST( -0.001, 28 ), psEncC->speech_activity_Q8 ); | ||
58 | if( psEncC->nb_subfr == 2 ) { | ||
59 | /* Multiply by 1.5 for 10 ms packets */ | ||
60 | NLSF_mu_Q20 = silk_ADD_RSHIFT( NLSF_mu_Q20, NLSF_mu_Q20, 1 ); | ||
61 | } | ||
62 | |||
63 | celt_assert( NLSF_mu_Q20 > 0 ); | ||
64 | silk_assert( NLSF_mu_Q20 <= SILK_FIX_CONST( 0.005, 20 ) ); | ||
65 | |||
66 | /* Calculate NLSF weights */ | ||
67 | silk_NLSF_VQ_weights_laroia( pNLSFW_QW, pNLSF_Q15, psEncC->predictLPCOrder ); | ||
68 | |||
69 | /* Update NLSF weights for interpolated NLSFs */ | ||
70 | doInterpolate = ( psEncC->useInterpolatedNLSFs == 1 ) && ( psEncC->indices.NLSFInterpCoef_Q2 < 4 ); | ||
71 | if( doInterpolate ) { | ||
72 | /* Calculate the interpolated NLSF vector for the first half */ | ||
73 | silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15, | ||
74 | psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder ); | ||
75 | |||
76 | /* Calculate first half NLSF weights for the interpolated NLSFs */ | ||
77 | silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_QW, pNLSF0_temp_Q15, psEncC->predictLPCOrder ); | ||
78 | |||
79 | /* Update NLSF weights with contribution from first half */ | ||
80 | i_sqr_Q15 = silk_LSHIFT( silk_SMULBB( psEncC->indices.NLSFInterpCoef_Q2, psEncC->indices.NLSFInterpCoef_Q2 ), 11 ); | ||
81 | for( i = 0; i < psEncC->predictLPCOrder; i++ ) { | ||
82 | pNLSFW_QW[ i ] = silk_ADD16( silk_RSHIFT( pNLSFW_QW[ i ], 1 ), silk_RSHIFT( | ||
83 | silk_SMULBB( pNLSFW0_temp_QW[ i ], i_sqr_Q15 ), 16) ); | ||
84 | silk_assert( pNLSFW_QW[ i ] >= 1 ); | ||
85 | } | ||
86 | } | ||
87 | |||
88 | silk_NLSF_encode( psEncC->indices.NLSFIndices, pNLSF_Q15, psEncC->psNLSF_CB, pNLSFW_QW, | ||
89 | NLSF_mu_Q20, psEncC->NLSF_MSVQ_Survivors, psEncC->indices.signalType ); | ||
90 | |||
91 | /* Convert quantized NLSFs back to LPC coefficients */ | ||
92 | silk_NLSF2A( PredCoef_Q12[ 1 ], pNLSF_Q15, psEncC->predictLPCOrder, psEncC->arch ); | ||
93 | |||
94 | if( doInterpolate ) { | ||
95 | /* Calculate the interpolated, quantized LSF vector for the first half */ | ||
96 | silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15, | ||
97 | psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder ); | ||
98 | |||
99 | /* Convert back to LPC coefficients */ | ||
100 | silk_NLSF2A( PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEncC->predictLPCOrder, psEncC->arch ); | ||
101 | |||
102 | } else { | ||
103 | /* Copy LPC coefficients for first half from second half */ | ||
104 | celt_assert( psEncC->predictLPCOrder <= MAX_LPC_ORDER ); | ||
105 | silk_memcpy( PredCoef_Q12[ 0 ], PredCoef_Q12[ 1 ], psEncC->predictLPCOrder * sizeof( opus_int16 ) ); | ||
106 | } | ||
107 | } | ||