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comparison: media/libopus/silk/float/schur_FLP.c
media/libopus/silk/float/schur_FLP.c
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- TOR_BUG_9701
- changeset 10
- ac0c01689b40
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| -1:000000000000 | 0:fe0ef4311479 |
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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 "SigProc_FLP.h" | |
| 33 | |
| 34 silk_float silk_schur_FLP( /* O returns residual energy */ | |
| 35 silk_float refl_coef[], /* O reflection coefficients (length order) */ | |
| 36 const silk_float auto_corr[], /* I autocorrelation sequence (length order+1) */ | |
| 37 opus_int order /* I order */ | |
| 38 ) | |
| 39 { | |
| 40 opus_int k, n; | |
| 41 silk_float C[ SILK_MAX_ORDER_LPC + 1 ][ 2 ]; | |
| 42 silk_float Ctmp1, Ctmp2, rc_tmp; | |
| 43 | |
| 44 silk_assert( order==6||order==8||order==10||order==12||order==14||order==16 ); | |
| 45 | |
| 46 /* Copy correlations */ | |
| 47 for( k = 0; k < order+1; k++ ) { | |
| 48 C[ k ][ 0 ] = C[ k ][ 1 ] = auto_corr[ k ]; | |
| 49 } | |
| 50 | |
| 51 for( k = 0; k < order; k++ ) { | |
| 52 /* Get reflection coefficient */ | |
| 53 rc_tmp = -C[ k + 1 ][ 0 ] / silk_max_float( C[ 0 ][ 1 ], 1e-9f ); | |
| 54 | |
| 55 /* Save the output */ | |
| 56 refl_coef[ k ] = rc_tmp; | |
| 57 | |
| 58 /* Update correlations */ | |
| 59 for( n = 0; n < order - k; n++ ) { | |
| 60 Ctmp1 = C[ n + k + 1 ][ 0 ]; | |
| 61 Ctmp2 = C[ n ][ 1 ]; | |
| 62 C[ n + k + 1 ][ 0 ] = Ctmp1 + Ctmp2 * rc_tmp; | |
| 63 C[ n ][ 1 ] = Ctmp2 + Ctmp1 * rc_tmp; | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 /* Return residual energy */ | |
| 68 return C[ 0 ][ 1 ]; | |
| 69 } | |
| 70 |
