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 "main.h" 33885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 34885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* Find least-squares prediction gain for one signal based on another and quantize it */ 35885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgopus_int32 silk_stereo_find_predictor( /* O Returns predictor in Q13 */ 36885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 *ratio_Q14, /* O Ratio of residual and mid energies */ 37885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int16 x[], /* I Basis signal */ 38885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int16 y[], /* I Target signal */ 39885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 mid_res_amp_Q0[], /* I/O Smoothed mid, residual norms */ 40885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int length, /* I Number of samples */ 41885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int smooth_coef_Q16 /* I Smoothing coefficient */ 42885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org) 43885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 44885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int scale, scale1, scale2; 45885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 nrgx, nrgy, corr, pred_Q13, pred2_Q10; 46885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 47885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Find predictor */ 48885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_sum_sqr_shift( &nrgx, &scale1, x, length ); 49885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_sum_sqr_shift( &nrgy, &scale2, y, length ); 50885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org scale = silk_max_int( scale1, scale2 ); 51885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org scale = scale + ( scale & 1 ); /* make even */ 52885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrgy = silk_RSHIFT32( nrgy, scale - scale2 ); 53885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrgx = silk_RSHIFT32( nrgx, scale - scale1 ); 54885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrgx = silk_max_int( nrgx, 1 ); 55885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org corr = silk_inner_prod_aligned_scale( x, y, scale, length ); 56885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org pred_Q13 = silk_DIV32_varQ( corr, nrgx, 13 ); 57885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org pred_Q13 = silk_LIMIT( pred_Q13, -(1 << 14), 1 << 14 ); 58885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org pred2_Q10 = silk_SMULWB( pred_Q13, pred_Q13 ); 59885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 60885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Faster update for signals with large prediction parameters */ 61885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org smooth_coef_Q16 = (opus_int)silk_max_int( smooth_coef_Q16, silk_abs( pred2_Q10 ) ); 62885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 63885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Smoothed mid and residual norms */ 64885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_assert( smooth_coef_Q16 < 32768 ); 65885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org scale = silk_RSHIFT( scale, 1 ); 66885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org mid_res_amp_Q0[ 0 ] = silk_SMLAWB( mid_res_amp_Q0[ 0 ], silk_LSHIFT( silk_SQRT_APPROX( nrgx ), scale ) - mid_res_amp_Q0[ 0 ], 67885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org smooth_coef_Q16 ); 68885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Residual energy = nrgy - 2 * pred * corr + pred^2 * nrgx */ 69885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrgy = silk_SUB_LSHIFT32( nrgy, silk_SMULWB( corr, pred_Q13 ), 3 + 1 ); 70885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org nrgy = silk_ADD_LSHIFT32( nrgy, silk_SMULWB( nrgx, pred2_Q10 ), 6 ); 71885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org mid_res_amp_Q0[ 1 ] = silk_SMLAWB( mid_res_amp_Q0[ 1 ], silk_LSHIFT( silk_SQRT_APPROX( nrgy ), scale ) - mid_res_amp_Q0[ 1 ], 72885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org smooth_coef_Q16 ); 73885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 74885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Ratio of smoothed residual and mid norms */ 75885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org *ratio_Q14 = silk_DIV32_varQ( mid_res_amp_Q0[ 1 ], silk_max( mid_res_amp_Q0[ 0 ], 1 ), 14 ); 76885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org *ratio_Q14 = silk_LIMIT( *ratio_Q14, 0, 32767 ); 77885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 78885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org return pred_Q13; 79885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 80