1 /***************************************************************************
2 * Copyright (C) 2015 by Pere Ràfols Soler *
3 * sapista2@gmail.com *
4 * *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 * *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
14 * *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
20
21 /***************************************************************************
22 This file contains Mid/Side stereo signals convertion methods
23 ****************************************************************************/
24
25 #ifndef MIDSIDE_H
26 #define MIDSIDE_H
27
28 #define MS_DUAL_CHANNEL 0
29 #define MS_L_MID_MODE 1
30 #define MS_R_SIDE_MODE 2
31
32 //Converts a LR stereo signal to a mid/side signal. M is stored in L pointer and S in R pointer
LR2MS(double * inL_M,double * inR_S,double enable)33 inline void LR2MS(double *inL_M, double *inR_S, double enable)
34 {
35 double M = 0.5*(*inL_M + *inR_S);
36 double S = 0.5*(*inL_M - *inR_S);
37 *inL_M = enable*M + (1.0 - enable)*(*inL_M);
38 *inR_S = enable*S + (1.0 - enable)*(*inR_S);
39 }
40
41 //Converts a M/S stereo signal to a LR signal. L is stored in M pointer and R in S pointer
MS2LR(double * inM_L,double * inS_R,double enable)42 inline void MS2LR(double *inM_L, double *inS_R, double enable)
43 {
44 double L = (*inM_L + *inS_R);
45 double R = (*inM_L - *inS_R);
46 *inM_L = enable*L + (1.0 - enable)*(*inM_L);
47 *inS_R = enable*R + (1.0 - enable)*(*inS_R);
48 }
49
50 #endif