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Diffstat (limited to 'lib/rbcodec/codecs/libopus/silk/float/residual_energy_FLP.c')
-rw-r--r-- | lib/rbcodec/codecs/libopus/silk/float/residual_energy_FLP.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/silk/float/residual_energy_FLP.c b/lib/rbcodec/codecs/libopus/silk/float/residual_energy_FLP.c new file mode 100644 index 0000000000..1bd07b33a4 --- /dev/null +++ b/lib/rbcodec/codecs/libopus/silk/float/residual_energy_FLP.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_FLP.h" | ||
33 | |||
34 | #define MAX_ITERATIONS_RESIDUAL_NRG 10 | ||
35 | #define REGULARIZATION_FACTOR 1e-8f | ||
36 | |||
37 | /* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */ | ||
38 | silk_float silk_residual_energy_covar_FLP( /* O Weighted residual energy */ | ||
39 | const silk_float *c, /* I Filter coefficients */ | ||
40 | silk_float *wXX, /* I/O Weighted correlation matrix, reg. out */ | ||
41 | const silk_float *wXx, /* I Weighted correlation vector */ | ||
42 | const silk_float wxx, /* I Weighted correlation value */ | ||
43 | const opus_int D /* I Dimension */ | ||
44 | ) | ||
45 | { | ||
46 | opus_int i, j, k; | ||
47 | silk_float tmp, nrg = 0.0f, regularization; | ||
48 | |||
49 | /* Safety checks */ | ||
50 | celt_assert( D >= 0 ); | ||
51 | |||
52 | regularization = REGULARIZATION_FACTOR * ( wXX[ 0 ] + wXX[ D * D - 1 ] ); | ||
53 | for( k = 0; k < MAX_ITERATIONS_RESIDUAL_NRG; k++ ) { | ||
54 | nrg = wxx; | ||
55 | |||
56 | tmp = 0.0f; | ||
57 | for( i = 0; i < D; i++ ) { | ||
58 | tmp += wXx[ i ] * c[ i ]; | ||
59 | } | ||
60 | nrg -= 2.0f * tmp; | ||
61 | |||
62 | /* compute c' * wXX * c, assuming wXX is symmetric */ | ||
63 | for( i = 0; i < D; i++ ) { | ||
64 | tmp = 0.0f; | ||
65 | for( j = i + 1; j < D; j++ ) { | ||
66 | tmp += matrix_c_ptr( wXX, i, j, D ) * c[ j ]; | ||
67 | } | ||
68 | nrg += c[ i ] * ( 2.0f * tmp + matrix_c_ptr( wXX, i, i, D ) * c[ i ] ); | ||
69 | } | ||
70 | if( nrg > 0 ) { | ||
71 | break; | ||
72 | } else { | ||
73 | /* Add white noise */ | ||
74 | for( i = 0; i < D; i++ ) { | ||
75 | matrix_c_ptr( wXX, i, i, D ) += regularization; | ||
76 | } | ||
77 | /* Increase noise for next run */ | ||
78 | regularization *= 2.0f; | ||
79 | } | ||
80 | } | ||
81 | if( k == MAX_ITERATIONS_RESIDUAL_NRG ) { | ||
82 | silk_assert( nrg == 0 ); | ||
83 | nrg = 1.0f; | ||
84 | } | ||
85 | |||
86 | return nrg; | ||
87 | } | ||
88 | |||
89 | /* Calculates residual energies of input subframes where all subframes have LPC_order */ | ||
90 | /* of preceding samples */ | ||
91 | void silk_residual_energy_FLP( | ||
92 | silk_float nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */ | ||
93 | const silk_float x[], /* I Input signal */ | ||
94 | silk_float a[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */ | ||
95 | const silk_float gains[], /* I Quantization gains */ | ||
96 | const opus_int subfr_length, /* I Subframe length */ | ||
97 | const opus_int nb_subfr, /* I number of subframes */ | ||
98 | const opus_int LPC_order /* I LPC order */ | ||
99 | ) | ||
100 | { | ||
101 | opus_int shift; | ||
102 | silk_float *LPC_res_ptr, LPC_res[ ( MAX_FRAME_LENGTH + MAX_NB_SUBFR * MAX_LPC_ORDER ) / 2 ]; | ||
103 | |||
104 | LPC_res_ptr = LPC_res + LPC_order; | ||
105 | shift = LPC_order + subfr_length; | ||
106 | |||
107 | /* Filter input to create the LPC residual for each frame half, and measure subframe energies */ | ||
108 | silk_LPC_analysis_filter_FLP( LPC_res, a[ 0 ], x + 0 * shift, 2 * shift, LPC_order ); | ||
109 | nrgs[ 0 ] = ( silk_float )( gains[ 0 ] * gains[ 0 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) ); | ||
110 | nrgs[ 1 ] = ( silk_float )( gains[ 1 ] * gains[ 1 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) ); | ||
111 | |||
112 | if( nb_subfr == MAX_NB_SUBFR ) { | ||
113 | silk_LPC_analysis_filter_FLP( LPC_res, a[ 1 ], x + 2 * shift, 2 * shift, LPC_order ); | ||
114 | nrgs[ 2 ] = ( silk_float )( gains[ 2 ] * gains[ 2 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) ); | ||
115 | nrgs[ 3 ] = ( silk_float )( gains[ 3 ] * gains[ 3 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) ); | ||
116 | } | ||
117 | } | ||