/*
  * ALAC (Apple Lossless Audio Codec) decoder
  * Copyright (c) 2005 David Hammerton
  *
  * 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 "alacdsp.h"
 #include "config.h"
 
 static void decorrelate_stereo(int32_t *buffer[2], int nb_samples,
                                int decorr_shift, int decorr_left_weight)
 {
     int i;
 
     for (i = 0; i < nb_samples; i++) {
         int32_t a, b;
 
         a = buffer[0][i];
         b = buffer[1][i];
 
         a -= (b * decorr_left_weight) >> decorr_shift;
         b += a;
 
         buffer[0][i] = b;
         buffer[1][i] = a;
     }
 }
 
 static void append_extra_bits(int32_t *buffer[2], int32_t *extra_bits_buffer[2],
                               int extra_bits, int channels, int nb_samples)
 {
     int i, ch;
 
     for (ch = 0; ch < channels; ch++)
         for (i = 0; i < nb_samples; i++)
             buffer[ch][i] = (buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i];
 }
 
 av_cold void ff_alacdsp_init(ALACDSPContext *c)
 {
     c->decorrelate_stereo   = decorrelate_stereo;
     c->append_extra_bits[0] =
     c->append_extra_bits[1] = append_extra_bits;

 
     if (ARCH_X86)
         ff_alacdsp_init_x86(c);

 }