/src/opus/silk/float/k2a_FLP.c
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1 | | /*********************************************************************** |
2 | | Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
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4 | | modification, are permitted provided that the following conditions |
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26 | | ***********************************************************************/ |
27 | | |
28 | | #ifdef HAVE_CONFIG_H |
29 | | #include "config.h" |
30 | | #endif |
31 | | |
32 | | #include "SigProc_FLP.h" |
33 | | |
34 | | /* step up function, converts reflection coefficients to prediction coefficients */ |
35 | | void silk_k2a_FLP( |
36 | | silk_float *A, /* O prediction coefficients [order] */ |
37 | | const silk_float *rc, /* I reflection coefficients [order] */ |
38 | | opus_int32 order /* I prediction order */ |
39 | | ) |
40 | 0 | { |
41 | 0 | opus_int k, n; |
42 | 0 | silk_float rck, tmp1, tmp2; |
43 | |
|
44 | 0 | for( k = 0; k < order; k++ ) { |
45 | 0 | rck = rc[ k ]; |
46 | 0 | for( n = 0; n < (k + 1) >> 1; n++ ) { |
47 | 0 | tmp1 = A[ n ]; |
48 | 0 | tmp2 = A[ k - n - 1 ]; |
49 | 0 | A[ n ] = tmp1 + tmp2 * rck; |
50 | 0 | A[ k - n - 1 ] = tmp2 + tmp1 * rck; |
51 | 0 | } |
52 | 0 | A[ k ] = -rck; |
53 | 0 | } |
54 | 0 | } |