media/libopus/silk/float/corrMatrix_FLP.c@b8a032363ba2 (annotated)
media/libopus/silk/float/corrMatrix_FLP.c
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /*********************************************************************** |
| michael@0 | 2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| michael@0 | 3 | Redistribution and use in source and binary forms, with or without |
| michael@0 | 4 | modification, are permitted provided that the following conditions |
| michael@0 | 5 | are met: |
| michael@0 | 6 | - Redistributions of source code must retain the above copyright notice, |
| michael@0 | 7 | this list of conditions and the following disclaimer. |
| michael@0 | 8 | - Redistributions in binary form must reproduce the above copyright |
| michael@0 | 9 | notice, this list of conditions and the following disclaimer in the |
| michael@0 | 10 | documentation and/or other materials provided with the distribution. |
| michael@0 | 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
| michael@0 | 12 | names of specific contributors, may be used to endorse or promote |
| michael@0 | 13 | products derived from this software without specific prior written |
| michael@0 | 14 | permission. |
| michael@0 | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| michael@0 | 16 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| michael@0 | 17 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| michael@0 | 18 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| michael@0 | 19 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| michael@0 | 20 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| michael@0 | 21 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| michael@0 | 22 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| michael@0 | 23 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| michael@0 | 24 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| michael@0 | 25 | POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 26 | ***********************************************************************/ |
| michael@0 | 27 | |
| michael@0 | 28 | #ifdef HAVE_CONFIG_H |
| michael@0 | 29 | #include "config.h" |
| michael@0 | 30 | #endif |
| michael@0 | 31 | |
| michael@0 | 32 | /********************************************************************** |
| michael@0 | 33 | * Correlation matrix computations for LS estimate. |
| michael@0 | 34 | **********************************************************************/ |
| michael@0 | 35 | |
| michael@0 | 36 | #include "main_FLP.h" |
| michael@0 | 37 | |
| michael@0 | 38 | /* Calculates correlation vector X'*t */ |
| michael@0 | 39 | void silk_corrVector_FLP( |
| michael@0 | 40 | const silk_float *x, /* I x vector [L+order-1] used to create X */ |
| michael@0 | 41 | const silk_float *t, /* I Target vector [L] */ |
| michael@0 | 42 | const opus_int L, /* I Length of vecors */ |
| michael@0 | 43 | const opus_int Order, /* I Max lag for correlation */ |
| michael@0 | 44 | silk_float *Xt /* O X'*t correlation vector [order] */ |
| michael@0 | 45 | ) |
| michael@0 | 46 | { |
| michael@0 | 47 | opus_int lag; |
| michael@0 | 48 | const silk_float *ptr1; |
| michael@0 | 49 | |
| michael@0 | 50 | ptr1 = &x[ Order - 1 ]; /* Points to first sample of column 0 of X: X[:,0] */ |
| michael@0 | 51 | for( lag = 0; lag < Order; lag++ ) { |
| michael@0 | 52 | /* Calculate X[:,lag]'*t */ |
| michael@0 | 53 | Xt[ lag ] = (silk_float)silk_inner_product_FLP( ptr1, t, L ); |
| michael@0 | 54 | ptr1--; /* Next column of X */ |
| michael@0 | 55 | } |
| michael@0 | 56 | } |
| michael@0 | 57 | |
| michael@0 | 58 | /* Calculates correlation matrix X'*X */ |
| michael@0 | 59 | void silk_corrMatrix_FLP( |
| michael@0 | 60 | const silk_float *x, /* I x vector [ L+order-1 ] used to create X */ |
| michael@0 | 61 | const opus_int L, /* I Length of vectors */ |
| michael@0 | 62 | const opus_int Order, /* I Max lag for correlation */ |
| michael@0 | 63 | silk_float *XX /* O X'*X correlation matrix [order x order] */ |
| michael@0 | 64 | ) |
| michael@0 | 65 | { |
| michael@0 | 66 | opus_int j, lag; |
| michael@0 | 67 | double energy; |
| michael@0 | 68 | const silk_float *ptr1, *ptr2; |
| michael@0 | 69 | |
| michael@0 | 70 | ptr1 = &x[ Order - 1 ]; /* First sample of column 0 of X */ |
| michael@0 | 71 | energy = silk_energy_FLP( ptr1, L ); /* X[:,0]'*X[:,0] */ |
| michael@0 | 72 | matrix_ptr( XX, 0, 0, Order ) = ( silk_float )energy; |
| michael@0 | 73 | for( j = 1; j < Order; j++ ) { |
| michael@0 | 74 | /* Calculate X[:,j]'*X[:,j] */ |
| michael@0 | 75 | energy += ptr1[ -j ] * ptr1[ -j ] - ptr1[ L - j ] * ptr1[ L - j ]; |
| michael@0 | 76 | matrix_ptr( XX, j, j, Order ) = ( silk_float )energy; |
| michael@0 | 77 | } |
| michael@0 | 78 | |
| michael@0 | 79 | ptr2 = &x[ Order - 2 ]; /* First sample of column 1 of X */ |
| michael@0 | 80 | for( lag = 1; lag < Order; lag++ ) { |
| michael@0 | 81 | /* Calculate X[:,0]'*X[:,lag] */ |
| michael@0 | 82 | energy = silk_inner_product_FLP( ptr1, ptr2, L ); |
| michael@0 | 83 | matrix_ptr( XX, lag, 0, Order ) = ( silk_float )energy; |
| michael@0 | 84 | matrix_ptr( XX, 0, lag, Order ) = ( silk_float )energy; |
| michael@0 | 85 | /* Calculate X[:,j]'*X[:,j + lag] */ |
| michael@0 | 86 | for( j = 1; j < ( Order - lag ); j++ ) { |
| michael@0 | 87 | energy += ptr1[ -j ] * ptr2[ -j ] - ptr1[ L - j ] * ptr2[ L - j ]; |
| michael@0 | 88 | matrix_ptr( XX, lag + j, j, Order ) = ( silk_float )energy; |
| michael@0 | 89 | matrix_ptr( XX, j, lag + j, Order ) = ( silk_float )energy; |
| michael@0 | 90 | } |
| michael@0 | 91 | ptr2--; /* Next column of X */ |
| michael@0 | 92 | } |
| michael@0 | 93 | } |
