1885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/*********************************************************************** 2885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgCopyright (c) 2006-2011, Skype Limited. All rights reserved. 3885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgRedistribution and use in source and binary forms, with or without 4885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgmodification, are permitted provided that the following conditions 5885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgare met: 6885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org- Redistributions of source code must retain the above copyright notice, 7885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgthis list of conditions and the following disclaimer. 8885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org- Redistributions in binary form must reproduce the above copyright 9885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgnotice, this list of conditions and the following disclaimer in the 10885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgdocumentation and/or other materials provided with the distribution. 11e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org- Neither the name of Internet Society, IETF or IETF Trust, nor the 12885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgnames of specific contributors, may be used to endorse or promote 13885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgproducts derived from this software without specific prior written 14885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgpermission. 15e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.orgTHIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgAND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgIMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 19885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgLIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgCONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgSUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgINTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgCONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgPOSSIBILITY OF SUCH DAMAGE. 26885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org***********************************************************************/ 27885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 28885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#ifdef HAVE_CONFIG_H 29885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#include "config.h" 30885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#endif 31885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 32885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org#include "SigProc_FLP.h" 33885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 34885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgsilk_float silk_schur_FLP( /* O returns residual energy */ 35885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float refl_coef[], /* O reflection coefficients (length order) */ 36885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const silk_float auto_corr[], /* I autocorrelation sequence (length order+1) */ 37885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int order /* I order */ 38885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org) 39885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 40885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int k, n; 41885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float C[ SILK_MAX_ORDER_LPC + 1 ][ 2 ]; 42885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_float Ctmp1, Ctmp2, rc_tmp; 43885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 44885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_assert( order==6||order==8||order==10||order==12||order==14||order==16 ); 45885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 46885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Copy correlations */ 47885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( k = 0; k < order+1; k++ ) { 48885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org C[ k ][ 0 ] = C[ k ][ 1 ] = auto_corr[ k ]; 49885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 50885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 51885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( k = 0; k < order; k++ ) { 52885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Get reflection coefficient */ 53885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org rc_tmp = -C[ k + 1 ][ 0 ] / silk_max_float( C[ 0 ][ 1 ], 1e-9f ); 54885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 55885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Save the output */ 56885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org refl_coef[ k ] = rc_tmp; 57885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 58885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Update correlations */ 59885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( n = 0; n < order - k; n++ ) { 60885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org Ctmp1 = C[ n + k + 1 ][ 0 ]; 61885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org Ctmp2 = C[ n ][ 1 ]; 62885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org C[ n + k + 1 ][ 0 ] = Ctmp1 + Ctmp2 * rc_tmp; 63885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org C[ n ][ 1 ] = Ctmp2 + Ctmp1 * rc_tmp; 64885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 65885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 66885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 67885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Return residual energy */ 68885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org return C[ 0 ][ 1 ]; 69885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 70885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 71