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_FIX.h" 33885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 34885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* Slower than schur(), but more accurate. */ 35885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* Uses SMULL(), available on armv4 */ 36885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgopus_int32 silk_schur64( /* O returns residual energy */ 37885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 rc_Q16[], /* O Reflection coefficients [order] Q16 */ 38885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int32 c[], /* I Correlations [order+1] */ 39885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 order /* I Prediction order */ 40885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org) 41885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 42885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int k, n; 43885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 C[ SILK_MAX_ORDER_LPC + 1 ][ 2 ]; 44885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 Ctmp1_Q30, Ctmp2_Q30, rc_tmp_Q31; 45885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 46885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_assert( order==6||order==8||order==10||order==12||order==14||order==16 ); 47885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 48885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Check for invalid input */ 49885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org if( c[ 0 ] <= 0 ) { 50885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_memset( rc_Q16, 0, order * sizeof( opus_int32 ) ); 51885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org return 0; 52885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 53885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 54885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( k = 0; k < order + 1; k++ ) { 55885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org C[ k ][ 0 ] = C[ k ][ 1 ] = c[ k ]; 56885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 57885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 58885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( k = 0; k < order; k++ ) { 59e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org /* Check that we won't be getting an unstable rc, otherwise stop here. */ 60e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org if (silk_abs_int32(C[ k + 1 ][ 0 ]) >= C[ 0 ][ 1 ]) { 61e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org if ( C[ k + 1 ][ 0 ] > 0 ) { 62e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org rc_Q16[ k ] = -SILK_FIX_CONST( .99f, 16 ); 63e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org } else { 64e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org rc_Q16[ k ] = SILK_FIX_CONST( .99f, 16 ); 65e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org } 66e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org k++; 67e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org break; 68e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org } 69e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org 70885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Get reflection coefficient: divide two Q30 values and get result in Q31 */ 71885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org rc_tmp_Q31 = silk_DIV32_varQ( -C[ k + 1 ][ 0 ], C[ 0 ][ 1 ], 31 ); 72885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 73885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Save the output */ 74885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org rc_Q16[ k ] = silk_RSHIFT_ROUND( rc_tmp_Q31, 15 ); 75885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 76885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Update correlations */ 77885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( n = 0; n < order - k; n++ ) { 78885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org Ctmp1_Q30 = C[ n + k + 1 ][ 0 ]; 79885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org Ctmp2_Q30 = C[ n ][ 1 ]; 80885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 81885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Multiply and add the highest int32 */ 82885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org C[ n + k + 1 ][ 0 ] = Ctmp1_Q30 + silk_SMMUL( silk_LSHIFT( Ctmp2_Q30, 1 ), rc_tmp_Q31 ); 83885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org C[ n ][ 1 ] = Ctmp2_Q30 + silk_SMMUL( silk_LSHIFT( Ctmp1_Q30, 1 ), rc_tmp_Q31 ); 84885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 85885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 86885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 87e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org for(; k < order; k++ ) { 88e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org rc_Q16[ k ] = 0; 89e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org } 90e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org 91e3ea049fcaee2247e45f0ce793d4313babb4ef69tlegrand@chromium.org return silk_max_32( 1, C[ 0 ][ 1 ] ); 92885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 93