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. 11885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@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. 15885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@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/* Decode mid/side predictors */ 35885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgvoid silk_stereo_decode_pred( 36885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org ec_dec *psRangeDec, /* I/O Compressor data structure */ 37885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 pred_Q13[] /* O Predictors */ 38885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org) 39885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 40885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int n, ix[ 2 ][ 3 ]; 41885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int32 low_Q13, step_Q13; 42885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 43885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Entropy decoding */ 44885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org n = ec_dec_icdf( psRangeDec, silk_stereo_pred_joint_iCDF, 8 ); 45885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org ix[ 0 ][ 2 ] = silk_DIV32_16( n, 5 ); 46885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org ix[ 1 ][ 2 ] = n - 5 * ix[ 0 ][ 2 ]; 47885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( n = 0; n < 2; n++ ) { 48885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org ix[ n ][ 0 ] = ec_dec_icdf( psRangeDec, silk_uniform3_iCDF, 8 ); 49885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org ix[ n ][ 1 ] = ec_dec_icdf( psRangeDec, silk_uniform5_iCDF, 8 ); 50885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 51885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 52885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Dequantize */ 53885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org for( n = 0; n < 2; n++ ) { 54885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org ix[ n ][ 0 ] += 3 * ix[ n ][ 2 ]; 55885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org low_Q13 = silk_stereo_pred_quant_Q13[ ix[ n ][ 0 ] ]; 56885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org step_Q13 = silk_SMULWB( silk_stereo_pred_quant_Q13[ ix[ n ][ 0 ] + 1 ] - low_Q13, 57885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org SILK_FIX_CONST( 0.5 / STEREO_QUANT_SUB_STEPS, 16 ) ); 58885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org pred_Q13[ n ] = silk_SMLABB( low_Q13, step_Q13, 2 * ix[ n ][ 1 ] + 1 ); 59885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org } 60885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 61885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Subtract second from first predictor (helps when actually applying these) */ 62885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org pred_Q13[ 0 ] -= pred_Q13[ 1 ]; 63885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 64885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org 65885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org/* Decode mid-only flag */ 66885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.orgvoid silk_stereo_decode_mid_only( 67885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org ec_dec *psRangeDec, /* I/O Compressor data structure */ 68885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org opus_int *decode_only_mid /* O Flag that only mid channel has been coded */ 69885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org) 70885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org{ 71885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org /* Decode flag that only mid channel is coded */ 72885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org *decode_only_mid = ec_dec_icdf( psRangeDec, silk_stereo_only_code_mid_iCDF, 8 ); 73885f2ff5a7a7d6a73432d26a6c0ae9147e6b452sergeyu@chromium.org} 74