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/* Convert adaptive Mid/Side representation to Left/Right stereo signal */ 35885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgvoid silk_stereo_MS_to_LR( 36885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org stereo_dec_state *state, /* I/O State */ 37885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int16 x1[], /* I/O Left input signal, becomes mid signal */ 38885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int16 x2[], /* I/O Right input signal, becomes side signal */ 39885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org const opus_int32 pred_Q13[], /* I Predictors */ 40885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int fs_kHz, /* I Samples rate (kHz) */ 41885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int frame_length /* I Number of samples */ 42885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org) 43885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 44885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int n, denom_Q16, delta0_Q13, delta1_Q13; 45885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 sum, diff, pred0_Q13, pred1_Q13; 46885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 47885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Buffering */ 48885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_memcpy( x1, state->sMid, 2 * sizeof( opus_int16 ) ); 49885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_memcpy( x2, state->sSide, 2 * sizeof( opus_int16 ) ); 50885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_memcpy( state->sMid, &x1[ frame_length ], 2 * sizeof( opus_int16 ) ); 51885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org silk_memcpy( state->sSide, &x2[ frame_length ], 2 * sizeof( opus_int16 ) ); 52885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 53885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Interpolate predictors and add prediction to side channel */ 54885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org pred0_Q13 = state->pred_prev_Q13[ 0 ]; 55885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org pred1_Q13 = state->pred_prev_Q13[ 1 ]; 56885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org denom_Q16 = silk_DIV32_16( (opus_int32)1 << 16, STEREO_INTERP_LEN_MS * fs_kHz ); 57885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org delta0_Q13 = silk_RSHIFT_ROUND( silk_SMULBB( pred_Q13[ 0 ] - state->pred_prev_Q13[ 0 ], denom_Q16 ), 16 ); 58885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org delta1_Q13 = silk_RSHIFT_ROUND( silk_SMULBB( pred_Q13[ 1 ] - state->pred_prev_Q13[ 1 ], denom_Q16 ), 16 ); 59885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( n = 0; n < STEREO_INTERP_LEN_MS * fs_kHz; n++ ) { 60885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org pred0_Q13 += delta0_Q13; 61885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org pred1_Q13 += delta1_Q13; 62885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org sum = silk_LSHIFT( silk_ADD_LSHIFT( x1[ n ] + x1[ n + 2 ], x1[ n + 1 ], 1 ), 9 ); /* Q11 */ 63885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org sum = silk_SMLAWB( silk_LSHIFT( (opus_int32)x2[ n + 1 ], 8 ), sum, pred0_Q13 ); /* Q8 */ 64885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org sum = silk_SMLAWB( sum, silk_LSHIFT( (opus_int32)x1[ n + 1 ], 11 ), pred1_Q13 ); /* Q8 */ 65885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org x2[ n + 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( sum, 8 ) ); 66885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 67885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org pred0_Q13 = pred_Q13[ 0 ]; 68885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org pred1_Q13 = pred_Q13[ 1 ]; 69885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( n = STEREO_INTERP_LEN_MS * fs_kHz; n < frame_length; n++ ) { 70885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org sum = silk_LSHIFT( silk_ADD_LSHIFT( x1[ n ] + x1[ n + 2 ], x1[ n + 1 ], 1 ), 9 ); /* Q11 */ 71885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org sum = silk_SMLAWB( silk_LSHIFT( (opus_int32)x2[ n + 1 ], 8 ), sum, pred0_Q13 ); /* Q8 */ 72885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org sum = silk_SMLAWB( sum, silk_LSHIFT( (opus_int32)x1[ n + 1 ], 11 ), pred1_Q13 ); /* Q8 */ 73885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org x2[ n + 1 ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( sum, 8 ) ); 74885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 75885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org state->pred_prev_Q13[ 0 ] = pred_Q13[ 0 ]; 76885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org state->pred_prev_Q13[ 1 ] = pred_Q13[ 1 ]; 77885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 78885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Convert to left/right signals */ 79885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( n = 0; n < frame_length; n++ ) { 80885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org sum = x1[ n + 1 ] + (opus_int32)x2[ n + 1 ]; 81885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org diff = x1[ n + 1 ] - (opus_int32)x2[ n + 1 ]; 82885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org x1[ n + 1 ] = (opus_int16)silk_SAT16( sum ); 83885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org x2[ n + 1 ] = (opus_int16)silk_SAT16( diff ); 84885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 85885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 86