/*
  * TAK decoder
  * Copyright (c) 2015 Paul B Mahol
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavutil/attributes.h"
 #include "takdsp.h"
 #include "config.h"
 
 static void decorrelate_ls(int32_t *p1, int32_t *p2, int length)
 {
     int i;
 
     for (i = 0; i < length; i++) {
         int32_t a = p1[i];
         int32_t b = p2[i];
         p2[i]     = a + b;
     }
 }
 
 static void decorrelate_sr(int32_t *p1, int32_t *p2, int length)
 {
     int i;
 
     for (i = 0; i < length; i++) {
         int32_t a = p1[i];
         int32_t b = p2[i];
         p1[i]     = b - a;
     }
 }
 
 static void decorrelate_sm(int32_t *p1, int32_t *p2, int length)
 {
     int i;
 
     for (i = 0; i < length; i++) {
         int32_t a = p1[i];
         int32_t b = p2[i];
         a        -= b >> 1;
         p1[i]     = a;
         p2[i]     = a + b;
     }
 }
 
 static void decorrelate_sf(int32_t *p1, int32_t *p2, int length, int dshift, int dfactor)
 {
     int i;
 
     for (i = 0; i < length; i++) {
         int32_t a = p1[i];
         int32_t b = p2[i];
         b         = dfactor * (b >> dshift) + 128 >> 8 << dshift;
         p1[i]     = b - a;
     }
 }
 
 av_cold void ff_takdsp_init(TAKDSPContext *c)
 {
     c->decorrelate_ls = decorrelate_ls;
     c->decorrelate_sr = decorrelate_sr;
     c->decorrelate_sm = decorrelate_sm;
     c->decorrelate_sf = decorrelate_sf;
 
     if (ARCH_X86)
         ff_takdsp_init_x86(c);
 }