text: /*
   * JPEG 2000 DSP functions
   * Copyright (c) 2007 Kamil Nowosad
   * Copyright (c) 2013 Nicolas Bertrand <nicoinattendu@gmail.com>
   *
   * 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 "config.h"
  #include "libavutil/attributes.h"
  #include "jpeg2000dsp.h"
  
  /* Inverse ICT parameters in float and integer.
   * int value = (float value) * (1<<16) */
  static const float f_ict_params[4] = {
      1.402f,
      0.34413f,
      0.71414f,
      1.772f
  };
  
  static const int i_ict_params[4] = {
       91881,
       22553,
       46802,
      116130
  };
  
  static void ict_float(void *_src0, void *_src1, void *_src2, int csize)
  {
      float *src0 = _src0, *src1 = _src1, *src2 = _src2;
      float i0f, i1f, i2f;
      int i;
  
      for (i = 0; i < csize; i++) {
          i0f = *src0 + (f_ict_params[0] * *src2);
          i1f = *src0 - (f_ict_params[1] * *src1)
                      - (f_ict_params[2] * *src2);
          i2f = *src0 + (f_ict_params[3] * *src1);
          *src0++ = i0f;
          *src1++ = i1f;
          *src2++ = i2f;
      }
  }
  
  static void ict_int(void *_src0, void *_src1, void *_src2, int csize)
  {
      int32_t *src0 = _src0, *src1 = _src1, *src2 = _src2;
      int32_t i0, i1, i2;
      int i;
  
      for (i = 0; i < csize; i++) {
          i0 = *src0 + (((i_ict_params[0] * *src2) + (1 << 15)) >> 16);
          i1 = *src0 - (((i_ict_params[1] * *src1) + (1 << 15)) >> 16)
                     - (((i_ict_params[2] * *src2) + (1 << 15)) >> 16);
          i2 = *src0 + (((i_ict_params[3] * *src1) + (1 << 15)) >> 16);
          *src0++ = i0;
          *src1++ = i1;
          *src2++ = i2;
      }
  }
  
  static void rct_int(void *_src0, void *_src1, void *_src2, int csize)
  {
      int32_t *src0 = _src0, *src1 = _src1, *src2 = _src2;
      int32_t i0, i1, i2;
      int i;
  
      for (i = 0; i < csize; i++) {
          i1 = *src0 - (*src2 + *src1 >> 2);
          i0 = i1 + *src2;
          i2 = i1 + *src1;
          *src0++ = i0;
          *src1++ = i1;
          *src2++ = i2;
      }
  }
  
  av_cold void ff_jpeg2000dsp_init(Jpeg2000DSPContext *c)
  {
      c->mct_decode[FF_DWT97]     = ict_float;
      c->mct_decode[FF_DWT53]     = rct_int;
      c->mct_decode[FF_DWT97_INT] = ict_int;
  
      if (ARCH_X86)
          ff_jpeg2000dsp_init_x86(c);
  }
  