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_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 0 : 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 0 : silk_float tmp, nrg = 0.0f, regularization;
48 :
49 : /* Safety checks */
50 0 : silk_assert( D >= 0 );
51 :
52 0 : regularization = REGULARIZATION_FACTOR * ( wXX[ 0 ] + wXX[ D * D - 1 ] );
53 0 : for( k = 0; k < MAX_ITERATIONS_RESIDUAL_NRG; k++ ) {
54 0 : nrg = wxx;
55 :
56 0 : tmp = 0.0f;
57 0 : for( i = 0; i < D; i++ ) {
58 0 : tmp += wXx[ i ] * c[ i ];
59 : }
60 0 : nrg -= 2.0f * tmp;
61 :
62 : /* compute c' * wXX * c, assuming wXX is symmetric */
63 0 : for( i = 0; i < D; i++ ) {
64 0 : tmp = 0.0f;
65 0 : for( j = i + 1; j < D; j++ ) {
66 0 : tmp += matrix_c_ptr( wXX, i, j, D ) * c[ j ];
67 : }
68 0 : nrg += c[ i ] * ( 2.0f * tmp + matrix_c_ptr( wXX, i, i, D ) * c[ i ] );
69 : }
70 0 : if( nrg > 0 ) {
71 0 : break;
72 : } else {
73 : /* Add white noise */
74 0 : for( i = 0; i < D; i++ ) {
75 0 : matrix_c_ptr( wXX, i, i, D ) += regularization;
76 : }
77 : /* Increase noise for next run */
78 0 : regularization *= 2.0f;
79 : }
80 : }
81 0 : if( k == MAX_ITERATIONS_RESIDUAL_NRG ) {
82 0 : silk_assert( nrg == 0 );
83 0 : nrg = 1.0f;
84 : }
85 :
86 0 : return nrg;
87 : }
88 :
89 : /* Calculates residual energies of input subframes where all subframes have LPC_order */
90 : /* of preceding samples */
91 0 : 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 0 : LPC_res_ptr = LPC_res + LPC_order;
105 0 : shift = LPC_order + subfr_length;
106 :
107 : /* Filter input to create the LPC residual for each frame half, and measure subframe energies */
108 0 : silk_LPC_analysis_filter_FLP( LPC_res, a[ 0 ], x + 0 * shift, 2 * shift, LPC_order );
109 0 : nrgs[ 0 ] = ( silk_float )( gains[ 0 ] * gains[ 0 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) );
110 0 : nrgs[ 1 ] = ( silk_float )( gains[ 1 ] * gains[ 1 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) );
111 :
112 0 : if( nb_subfr == MAX_NB_SUBFR ) {
113 0 : silk_LPC_analysis_filter_FLP( LPC_res, a[ 1 ], x + 2 * shift, 2 * shift, LPC_order );
114 0 : nrgs[ 2 ] = ( silk_float )( gains[ 2 ] * gains[ 2 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) );
115 0 : nrgs[ 3 ] = ( silk_float )( gains[ 3 ] * gains[ 3 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) );
116 : }
117 0 : }
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