text: /*
   * Copyright (C) 2004-2010 Michael Niedermayer <michaelni@gmx.at>
   * Copyright (C) 2008 David Conrad
   *
   * 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 "libavutil/avassert.h"
  #include "libavutil/common.h"
  #include "dsputil.h"
  #include "snow_dwt.h"
  
  int ff_slice_buffer_init(slice_buffer *buf, int line_count,
                           int max_allocated_lines, int line_width,
                           IDWTELEM *base_buffer)
  {
      int i;
  
      buf->base_buffer = base_buffer;
      buf->line_count  = line_count;
      buf->line_width  = line_width;
      buf->data_count  = max_allocated_lines;
      buf->line        = av_mallocz_array(line_count, sizeof(IDWTELEM *));
      if (!buf->line)
          return AVERROR(ENOMEM);
      buf->data_stack  = av_malloc_array(max_allocated_lines, sizeof(IDWTELEM *));
      if (!buf->data_stack) {
          av_freep(&buf->line);
          return AVERROR(ENOMEM);
      }
  
      for (i = 0; i < max_allocated_lines; i++) {
          buf->data_stack[i] = av_malloc_array(line_width, sizeof(IDWTELEM));
          if (!buf->data_stack[i]) {
              for (i--; i >=0; i--)
                  av_freep(&buf->data_stack[i]);
              av_freep(&buf->data_stack);
              av_freep(&buf->line);
              return AVERROR(ENOMEM);
          }
      }
  
      buf->data_stack_top = max_allocated_lines - 1;
      return 0;
  }
  
  IDWTELEM *ff_slice_buffer_load_line(slice_buffer *buf, int line)
  {
      IDWTELEM *buffer;
  
      av_assert0(buf->data_stack_top >= 0);
  //  av_assert1(!buf->line[line]);
      if (buf->line[line])
          return buf->line[line];
  
      buffer = buf->data_stack[buf->data_stack_top];
      buf->data_stack_top--;
      buf->line[line] = buffer;
  
      return buffer;
  }
  
  void ff_slice_buffer_release(slice_buffer *buf, int line)
  {
      IDWTELEM *buffer;
  
      av_assert1(line >= 0 && line < buf->line_count);
      av_assert1(buf->line[line]);
  
      buffer = buf->line[line];
      buf->data_stack_top++;
      buf->data_stack[buf->data_stack_top] = buffer;
      buf->line[line]                      = NULL;
  }
  
  void ff_slice_buffer_flush(slice_buffer *buf)
  {
      int i;
      for (i = 0; i < buf->line_count; i++)
          if (buf->line[i])
              ff_slice_buffer_release(buf, i);
  }
  
  void ff_slice_buffer_destroy(slice_buffer *buf)
  {
      int i;
      ff_slice_buffer_flush(buf);
  
      for (i = buf->data_count - 1; i >= 0; i--)
          av_freep(&buf->data_stack[i]);
      av_freep(&buf->data_stack);
      av_freep(&buf->line);
  }
  
  static inline int mirror(int v, int m)
  {
      while ((unsigned)v > (unsigned)m) {
          v = -v;
          if (v < 0)
              v += 2 * m;
      }
      return v;
  }
  
  static av_always_inline void lift(DWTELEM *dst, DWTELEM *src, DWTELEM *ref,
                                    int dst_step, int src_step, int ref_step,
                                    int width, int mul, int add, int shift,
                                    int highpass, int inverse)
  {
      const int mirror_left  = !highpass;
      const int mirror_right = (width & 1) ^ highpass;
      const int w            = (width >> 1) - 1 + (highpass & width);
      int i;
  
  #define LIFT(src, ref, inv) ((src) + ((inv) ? -(ref) : +(ref)))
      if (mirror_left) {
          dst[0] = LIFT(src[0], ((mul * 2 * ref[0] + add) >> shift), inverse);
          dst   += dst_step;
          src   += src_step;
      }
  
      for (i = 0; i < w; i++)
          dst[i * dst_step] = LIFT(src[i * src_step],
                                   ((mul * (ref[i * ref_step] +
                                            ref[(i + 1) * ref_step]) +
                                     add) >> shift),
                                   inverse);
  
      if (mirror_right)
          dst[w * dst_step] = LIFT(src[w * src_step],
                                   ((mul * 2 * ref[w * ref_step] + add) >> shift),
                                   inverse);
  }
  
  static av_always_inline void liftS(DWTELEM *dst, DWTELEM *src, DWTELEM *ref,
                                     int dst_step, int src_step, int ref_step,
                                     int width, int mul, int add, int shift,
                                     int highpass, int inverse)
  {
      const int mirror_left  = !highpass;
      const int mirror_right = (width & 1) ^ highpass;
      const int w            = (width >> 1) - 1 + (highpass & width);
      int i;
  
      av_assert1(shift == 4);
  #define LIFTS(src, ref, inv)                                            \
      ((inv) ? (src) + (((ref) + 4 * (src)) >> shift)                     \
             : -((-16 * (src) + (ref) + add /                             \
                  4 + 1 + (5 << 25)) / (5 * 4) - (1 << 23)))
      if (mirror_left) {
          dst[0] = LIFTS(src[0], mul * 2 * ref[0] + add, inverse);
          dst   += dst_step;
          src   += src_step;
      }
  
      for (i = 0; i < w; i++)
          dst[i * dst_step] = LIFTS(src[i * src_step],
                                    mul * (ref[i * ref_step] +
                                           ref[(i + 1) * ref_step]) + add,
                                    inverse);
  
      if (mirror_right)
          dst[w * dst_step] = LIFTS(src[w * src_step],
                                    mul * 2 * ref[w * ref_step] + add,
                                    inverse);
  }
  
  static void horizontal_decompose53i(DWTELEM *b, DWTELEM *temp, int width)
  {
      const int width2 = width >> 1;
      int x;
      const int w2 = (width + 1) >> 1;
  
      for (x = 0; x < width2; x++) {
          temp[x]      = b[2 * x];
          temp[x + w2] = b[2 * x + 1];
      }
      if (width & 1)
          temp[x] = b[2 * x];
      lift(b + w2, temp + w2, temp,   1, 1, 1, width, -1, 0, 1, 1, 0);
      lift(b,      temp,      b + w2, 1, 1, 1, width,  1, 2, 2, 0, 0);
  }
  
  static void vertical_decompose53iH0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2,
                                      int width)
  {
      int i;
  
      for (i = 0; i < width; i++)
          b1[i] -= (b0[i] + b2[i]) >> 1;
  }
  
  static void vertical_decompose53iL0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2,
                                      int width)
  {
      int i;
  
      for (i = 0; i < width; i++)
          b1[i] += (b0[i] + b2[i] + 2) >> 2;
  }
  
  static void spatial_decompose53i(DWTELEM *buffer, DWTELEM *temp,
                                   int width, int height, int stride)
  {
      int y;
      DWTELEM *b0 = buffer + mirror(-2 - 1, height - 1) * stride;
      DWTELEM *b1 = buffer + mirror(-2,     height - 1) * stride;
  
      for (y = -2; y < height; y += 2) {
          DWTELEM *b2 = buffer + mirror(y + 1, height - 1) * stride;
          DWTELEM *b3 = buffer + mirror(y + 2, height - 1) * stride;
  
          if (y + 1 < (unsigned)height)
              horizontal_decompose53i(b2, temp, width);
          if (y + 2 < (unsigned)height)
              horizontal_decompose53i(b3, temp, width);
  
          if (y + 1 < (unsigned)height)
              vertical_decompose53iH0(b1, b2, b3, width);
          if (y + 0 < (unsigned)height)
              vertical_decompose53iL0(b0, b1, b2, width);
  
          b0 = b2;
          b1 = b3;
      }
  }
  
  static void horizontal_decompose97i(DWTELEM *b, DWTELEM *temp, int width)
  {
      const int w2 = (width + 1) >> 1;
  
      lift(temp + w2, b + 1, b,         1, 2, 2, width, W_AM, W_AO, W_AS, 1, 1);
      liftS(temp,     b,     temp + w2, 1, 2, 1, width, W_BM, W_BO, W_BS, 0, 0);
      lift(b + w2, temp + w2, temp,     1, 1, 1, width, W_CM, W_CO, W_CS, 1, 0);
      lift(b,      temp,      b + w2,   1, 1, 1, width, W_DM, W_DO, W_DS, 0, 0);
  }
  
  static void vertical_decompose97iH0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2,
                                      int width)
  {
      int i;
  
      for (i = 0; i < width; i++)
          b1[i] -= (W_AM * (b0[i] + b2[i]) + W_AO) >> W_AS;
  }
  
  static void vertical_decompose97iH1(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2,
                                      int width)
  {
      int i;
  
      for (i = 0; i < width; i++)
          b1[i] += (W_CM * (b0[i] + b2[i]) + W_CO) >> W_CS;
  }
  
  static void vertical_decompose97iL0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2,
                                      int width)
  {
      int i;
  
      for (i = 0; i < width; i++)
          b1[i] = (16 * 4 * b1[i] - 4 * (b0[i] + b2[i]) + W_BO * 5 + (5 << 27)) /
                  (5 * 16) - (1 << 23);
  }
  
  static void vertical_decompose97iL1(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2,
                                      int width)
  {
      int i;
  
      for (i = 0; i < width; i++)
          b1[i] += (W_DM * (b0[i] + b2[i]) + W_DO) >> W_DS;
  }
  
  static void spatial_decompose97i(DWTELEM *buffer, DWTELEM *temp,
                                   int width, int height, int stride)
  {
      int y;
      DWTELEM *b0 = buffer + mirror(-4 - 1, height - 1) * stride;
      DWTELEM *b1 = buffer + mirror(-4,     height - 1) * stride;
      DWTELEM *b2 = buffer + mirror(-4 + 1, height - 1) * stride;
      DWTELEM *b3 = buffer + mirror(-4 + 2, height - 1) * stride;
  
      for (y = -4; y < height; y += 2) {
          DWTELEM *b4 = buffer + mirror(y + 3, height - 1) * stride;
          DWTELEM *b5 = buffer + mirror(y + 4, height - 1) * stride;
  
          if (y + 3 < (unsigned)height)
              horizontal_decompose97i(b4, temp, width);
          if (y + 4 < (unsigned)height)
              horizontal_decompose97i(b5, temp, width);
  
          if (y + 3 < (unsigned)height)
              vertical_decompose97iH0(b3, b4, b5, width);
          if (y + 2 < (unsigned)height)
              vertical_decompose97iL0(b2, b3, b4, width);
          if (y + 1 < (unsigned)height)
              vertical_decompose97iH1(b1, b2, b3, width);
          if (y + 0 < (unsigned)height)
              vertical_decompose97iL1(b0, b1, b2, width);
  
          b0 = b2;
          b1 = b3;
          b2 = b4;
          b3 = b5;
      }
  }
  
  void ff_spatial_dwt(DWTELEM *buffer, DWTELEM *temp, int width, int height,
                      int stride, int type, int decomposition_count)
  {
      int level;
  
      for (level = 0; level < decomposition_count; level++) {
          switch (type) {
          case DWT_97:
              spatial_decompose97i(buffer, temp,
                                   width >> level, height >> level,
                                   stride << level);
              break;
          case DWT_53:
              spatial_decompose53i(buffer, temp,
                                   width >> level, height >> level,
                                   stride << level);
              break;
          }
      }
  }
  
  static void horizontal_compose53i(IDWTELEM *b, IDWTELEM *temp, int width)
  {
      const int width2 = width >> 1;
      const int w2     = (width + 1) >> 1;
      int x;
  
      for (x = 0; x < width2; x++) {
          temp[2 * x]     = b[x];
          temp[2 * x + 1] = b[x + w2];
      }
      if (width & 1)
          temp[2 * x] = b[x];
  
      b[0] = temp[0] - ((temp[1] + 1) >> 1);
      for (x = 2; x < width - 1; x += 2) {
          b[x]     = temp[x]     - ((temp[x - 1] + temp[x + 1] + 2) >> 2);
          b[x - 1] = temp[x - 1] + ((b[x - 2]    + b[x]        + 1) >> 1);
      }
      if (width & 1) {
          b[x]     = temp[x]     - ((temp[x - 1]     + 1) >> 1);
          b[x - 1] = temp[x - 1] + ((b[x - 2] + b[x] + 1) >> 1);
      } else
          b[x - 1] = temp[x - 1] + b[x - 2];
  }
  
  static void vertical_compose53iH0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
                                    int width)
  {
      int i;
  
      for (i = 0; i < width; i++)
          b1[i] += (b0[i] + b2[i]) >> 1;
  }
  
  static void vertical_compose53iL0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
                                    int width)
  {
      int i;
  
      for (i = 0; i < width; i++)
          b1[i] -= (b0[i] + b2[i] + 2) >> 2;
  }
  
  static void spatial_compose53i_buffered_init(DWTCompose *cs, slice_buffer *sb,
                                               int height, int stride_line)
  {
      cs->b0 = slice_buffer_get_line(sb,
                                     mirror(-1 - 1, height - 1) * stride_line);
      cs->b1 = slice_buffer_get_line(sb, mirror(-1, height - 1) * stride_line);
      cs->y  = -1;
  }
  
  static void spatial_compose53i_init(DWTCompose *cs, IDWTELEM *buffer,
                                      int height, int stride)
  {
      cs->b0 = buffer + mirror(-1 - 1, height - 1) * stride;
      cs->b1 = buffer + mirror(-1,     height - 1) * stride;
      cs->y  = -1;
  }
  
  static void spatial_compose53i_dy_buffered(DWTCompose *cs, slice_buffer *sb,
                                             IDWTELEM *temp,
                                             int width, int height,
                                             int stride_line)
  {
      int y = cs->y;
  
      IDWTELEM *b0 = cs->b0;
      IDWTELEM *b1 = cs->b1;
      IDWTELEM *b2 = slice_buffer_get_line(sb,
                                           mirror(y + 1, height - 1) *
                                           stride_line);
      IDWTELEM *b3 = slice_buffer_get_line(sb,
                                           mirror(y + 2, height - 1) *
                                           stride_line);
  
      if (y + 1 < (unsigned)height && y < (unsigned)height) {
          int x;
  
          for (x = 0; x < width; x++) {
              b2[x] -= (b1[x] + b3[x] + 2) >> 2;
              b1[x] += (b0[x] + b2[x])     >> 1;
          }
      } else {
          if (y + 1 < (unsigned)height)
              vertical_compose53iL0(b1, b2, b3, width);
          if (y + 0 < (unsigned)height)
              vertical_compose53iH0(b0, b1, b2, width);
      }
  
      if (y - 1 < (unsigned)height)
          horizontal_compose53i(b0, temp, width);
      if (y + 0 < (unsigned)height)
          horizontal_compose53i(b1, temp, width);
  
      cs->b0  = b2;
      cs->b1  = b3;
      cs->y  += 2;
  }
  
  static void spatial_compose53i_dy(DWTCompose *cs, IDWTELEM *buffer,
                                    IDWTELEM *temp, int width, int height,
                                    int stride)
  {
      int y        = cs->y;
      IDWTELEM *b0 = cs->b0;
      IDWTELEM *b1 = cs->b1;
      IDWTELEM *b2 = buffer + mirror(y + 1, height - 1) * stride;
      IDWTELEM *b3 = buffer + mirror(y + 2, height - 1) * stride;
  
      if (y + 1 < (unsigned)height)
          vertical_compose53iL0(b1, b2, b3, width);
      if (y + 0 < (unsigned)height)
          vertical_compose53iH0(b0, b1, b2, width);
  
      if (y - 1 < (unsigned)height)
          horizontal_compose53i(b0, temp, width);
      if (y + 0 < (unsigned)height)
          horizontal_compose53i(b1, temp, width);
  
      cs->b0  = b2;
      cs->b1  = b3;
      cs->y  += 2;
  }
  
  void ff_snow_horizontal_compose97i(IDWTELEM *b, IDWTELEM *temp, int width)
  {
      const int w2 = (width + 1) >> 1;
      int x;
  
      temp[0] = b[0] - ((3 * b[w2] + 2) >> 2);
      for (x = 1; x < (width >> 1); x++) {
          temp[2 * x]     = b[x] - ((3 * (b[x + w2 - 1] + b[x + w2]) + 4) >> 3);
          temp[2 * x - 1] = b[x + w2 - 1] - temp[2 * x - 2] - temp[2 * x];
      }
      if (width & 1) {
          temp[2 * x]     = b[x] - ((3 * b[x + w2 - 1] + 2) >> 2);
          temp[2 * x - 1] = b[x + w2 - 1] - temp[2 * x - 2] - temp[2 * x];
      } else
          temp[2 * x - 1] = b[x + w2 - 1] - 2 * temp[2 * x - 2];
  
      b[0] = temp[0] + ((2 * temp[0] + temp[1] + 4) >> 3);
      for (x = 2; x < width - 1; x += 2) {
          b[x]     = temp[x] + ((4 * temp[x] + temp[x - 1] + temp[x + 1] + 8) >> 4);
          b[x - 1] = temp[x - 1] + ((3 * (b[x - 2] + b[x])) >> 1);
      }
      if (width & 1) {
          b[x]     = temp[x] + ((2 * temp[x] + temp[x - 1] + 4) >> 3);
          b[x - 1] = temp[x - 1] + ((3 * (b[x - 2] + b[x])) >> 1);
      } else
          b[x - 1] = temp[x - 1] + 3 * b[x - 2];
  }
  
  static void vertical_compose97iH0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
                                    int width)
  {
      int i;
  
      for (i = 0; i < width; i++)
          b1[i] += (W_AM * (b0[i] + b2[i]) + W_AO) >> W_AS;
  }
  
  static void vertical_compose97iH1(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
                                    int width)
  {
      int i;
  
      for (i = 0; i < width; i++)
          b1[i] -= (W_CM * (b0[i] + b2[i]) + W_CO) >> W_CS;
  }
  
  static void vertical_compose97iL0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
                                    int width)
  {
      int i;
  
      for (i = 0; i < width; i++)
          b1[i] += (W_BM * (b0[i] + b2[i]) + 4 * b1[i] + W_BO) >> W_BS;
  }
  
  static void vertical_compose97iL1(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
                                    int width)
  {
      int i;
  
      for (i = 0; i < width; i++)
          b1[i] -= (W_DM * (b0[i] + b2[i]) + W_DO) >> W_DS;
  }
  
  void ff_snow_vertical_compose97i(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
                                   IDWTELEM *b3, IDWTELEM *b4, IDWTELEM *b5,
                                   int width)
  {
      int i;
  
      for (i = 0; i < width; i++) {
          b4[i] -= (W_DM * (b3[i] + b5[i]) + W_DO) >> W_DS;
          b3[i] -= (W_CM * (b2[i] + b4[i]) + W_CO) >> W_CS;
          b2[i] += (W_BM * (b1[i] + b3[i]) + 4 * b2[i] + W_BO) >> W_BS;
          b1[i] += (W_AM * (b0[i] + b2[i]) + W_AO) >> W_AS;
      }
  }
  
  static void spatial_compose97i_buffered_init(DWTCompose *cs, slice_buffer *sb,
                                               int height, int stride_line)
  {
      cs->b0 = slice_buffer_get_line(sb, mirror(-3 - 1, height - 1) * stride_line);
      cs->b1 = slice_buffer_get_line(sb, mirror(-3,     height - 1) * stride_line);
      cs->b2 = slice_buffer_get_line(sb, mirror(-3 + 1, height - 1) * stride_line);
      cs->b3 = slice_buffer_get_line(sb, mirror(-3 + 2, height - 1) * stride_line);
      cs->y  = -3;
  }
  
  static void spatial_compose97i_init(DWTCompose *cs, IDWTELEM *buffer, int height,
                                      int stride)
  {
      cs->b0 = buffer + mirror(-3 - 1, height - 1) * stride;
      cs->b1 = buffer + mirror(-3,     height - 1) * stride;
      cs->b2 = buffer + mirror(-3 + 1, height - 1) * stride;
      cs->b3 = buffer + mirror(-3 + 2, height - 1) * stride;
      cs->y  = -3;
  }
  
  static void spatial_compose97i_dy_buffered(SnowDWTContext *dsp, DWTCompose *cs,
                                             slice_buffer * sb, IDWTELEM *temp,
                                             int width, int height,
                                             int stride_line)
  {
      int y = cs->y;
  
      IDWTELEM *b0 = cs->b0;
      IDWTELEM *b1 = cs->b1;
      IDWTELEM *b2 = cs->b2;
      IDWTELEM *b3 = cs->b3;
      IDWTELEM *b4 = slice_buffer_get_line(sb,
                                           mirror(y + 3, height - 1) *
                                           stride_line);
      IDWTELEM *b5 = slice_buffer_get_line(sb,
                                           mirror(y + 4, height - 1) *
                                           stride_line);
  
      if (y > 0 && y + 4 < height) {
          dsp->vertical_compose97i(b0, b1, b2, b3, b4, b5, width);
      } else {
          if (y + 3 < (unsigned)height)
              vertical_compose97iL1(b3, b4, b5, width);
          if (y + 2 < (unsigned)height)
              vertical_compose97iH1(b2, b3, b4, width);
          if (y + 1 < (unsigned)height)
              vertical_compose97iL0(b1, b2, b3, width);
          if (y + 0 < (unsigned)height)
              vertical_compose97iH0(b0, b1, b2, width);
      }
  
      if (y - 1 < (unsigned)height)
          dsp->horizontal_compose97i(b0, temp, width);
      if (y + 0 < (unsigned)height)
          dsp->horizontal_compose97i(b1, temp, width);
  
      cs->b0  = b2;
      cs->b1  = b3;
      cs->b2  = b4;
      cs->b3  = b5;
      cs->y  += 2;
  }
  
  static void spatial_compose97i_dy(DWTCompose *cs, IDWTELEM *buffer,
                                    IDWTELEM *temp, int width, int height,
                                    int stride)
  {
      int y        = cs->y;
      IDWTELEM *b0 = cs->b0;
      IDWTELEM *b1 = cs->b1;
      IDWTELEM *b2 = cs->b2;
      IDWTELEM *b3 = cs->b3;
      IDWTELEM *b4 = buffer + mirror(y + 3, height - 1) * stride;
      IDWTELEM *b5 = buffer + mirror(y + 4, height - 1) * stride;
  
      if (y + 3 < (unsigned)height)
          vertical_compose97iL1(b3, b4, b5, width);
      if (y + 2 < (unsigned)height)
          vertical_compose97iH1(b2, b3, b4, width);
      if (y + 1 < (unsigned)height)
          vertical_compose97iL0(b1, b2, b3, width);
      if (y + 0 < (unsigned)height)
          vertical_compose97iH0(b0, b1, b2, width);
  
      if (y - 1 < (unsigned)height)
          ff_snow_horizontal_compose97i(b0, temp, width);
      if (y + 0 < (unsigned)height)
          ff_snow_horizontal_compose97i(b1, temp, width);
  
      cs->b0  = b2;
      cs->b1  = b3;
      cs->b2  = b4;
      cs->b3  = b5;
      cs->y  += 2;
  }
  
  void ff_spatial_idwt_buffered_init(DWTCompose *cs, slice_buffer *sb, int width,
                                     int height, int stride_line, int type,
                                     int decomposition_count)
  {
      int level;
      for (level = decomposition_count - 1; level >= 0; level--) {
          switch (type) {
          case DWT_97:
              spatial_compose97i_buffered_init(cs + level, sb, height >> level,
                                               stride_line << level);
              break;
          case DWT_53:
              spatial_compose53i_buffered_init(cs + level, sb, height >> level,
                                               stride_line << level);
              break;
          }
      }
  }
  
  void ff_spatial_idwt_buffered_slice(SnowDWTContext *dsp, DWTCompose *cs,
                                      slice_buffer *slice_buf, IDWTELEM *temp,
                                      int width, int height, int stride_line,
                                      int type, int decomposition_count, int y)
  {
      const int support = type == 1 ? 3 : 5;
      int level;
      if (type == 2)
          return;
  
      for (level = decomposition_count - 1; level >= 0; level--)
          while (cs[level].y <= FFMIN((y >> level) + support, height >> level)) {
              switch (type) {
              case DWT_97:
                  spatial_compose97i_dy_buffered(dsp, cs + level, slice_buf, temp,
                                                 width >> level,
                                                 height >> level,
                                                 stride_line << level);
                  break;
              case DWT_53:
                  spatial_compose53i_dy_buffered(cs + level, slice_buf, temp,
                                                 width >> level,
                                                 height >> level,
                                                 stride_line << level);
                  break;
              }
          }
  }
  
  static void ff_spatial_idwt_init(DWTCompose *cs, IDWTELEM *buffer, int width,
                                   int height, int stride, int type,
                                   int decomposition_count)
  {
      int level;
      for (level = decomposition_count - 1; level >= 0; level--) {
          switch (type) {
          case DWT_97:
              spatial_compose97i_init(cs + level, buffer, height >> level,
                                      stride << level);
              break;
          case DWT_53:
              spatial_compose53i_init(cs + level, buffer, height >> level,
                                      stride << level);
              break;
          }
      }
  }
  
  static void ff_spatial_idwt_slice(DWTCompose *cs, IDWTELEM *buffer,
                                    IDWTELEM *temp, int width, int height,
                                    int stride, int type,
                                    int decomposition_count, int y)
  {
      const int support = type == 1 ? 3 : 5;
      int level;
      if (type == 2)
          return;
  
      for (level = decomposition_count - 1; level >= 0; level--)
          while (cs[level].y <= FFMIN((y >> level) + support, height >> level)) {
              switch (type) {
              case DWT_97:
                  spatial_compose97i_dy(cs + level, buffer, temp, width >> level,
                                        height >> level, stride << level);
                  break;
              case DWT_53:
                  spatial_compose53i_dy(cs + level, buffer, temp, width >> level,
                                        height >> level, stride << level);
                  break;
              }
          }
  }
  
  void ff_spatial_idwt(IDWTELEM *buffer, IDWTELEM *temp, int width, int height,
                       int stride, int type, int decomposition_count)
  {
      DWTCompose cs[MAX_DECOMPOSITIONS];
      int y;
      ff_spatial_idwt_init(cs, buffer, width, height, stride, type,
                           decomposition_count);
      for (y = 0; y < height; y += 4)
          ff_spatial_idwt_slice(cs, buffer, temp, width, height, stride, type,
                                decomposition_count, y);
  }
  
  static inline int w_c(struct MpegEncContext *v, uint8_t *pix1, uint8_t *pix2, int line_size,
                        int w, int h, int type)
  {
      int s, i, j;
      const int dec_count = w == 8 ? 3 : 4;
      int tmp[32 * 32], tmp2[32];
      int level, ori;
      static const int scale[2][2][4][4] = {
          {
              { // 9/7 8x8 dec=3
                  { 268, 239, 239, 213 },
                  { 0,   224, 224, 152 },
                  { 0,   135, 135, 110 },
              },
              { // 9/7 16x16 or 32x32 dec=4
                  { 344, 310, 310, 280 },
                  { 0,   320, 320, 228 },
                  { 0,   175, 175, 136 },
                  { 0,   129, 129, 102 },
              }
          },
          {
              { // 5/3 8x8 dec=3
                  { 275, 245, 245, 218 },
                  { 0,   230, 230, 156 },
                  { 0,   138, 138, 113 },
              },
              { // 5/3 16x16 or 32x32 dec=4
                  { 352, 317, 317, 286 },
                  { 0,   328, 328, 233 },
                  { 0,   180, 180, 140 },
                  { 0,   132, 132, 105 },
              }
          }
      };
  
      for (i = 0; i < h; i++) {
          for (j = 0; j < w; j += 4) {
              tmp[32 * i + j + 0] = (pix1[j + 0] - pix2[j + 0]) << 4;
              tmp[32 * i + j + 1] = (pix1[j + 1] - pix2[j + 1]) << 4;
              tmp[32 * i + j + 2] = (pix1[j + 2] - pix2[j + 2]) << 4;
              tmp[32 * i + j + 3] = (pix1[j + 3] - pix2[j + 3]) << 4;
          }
          pix1 += line_size;
          pix2 += line_size;
      }
  
      ff_spatial_dwt(tmp, tmp2, w, h, 32, type, dec_count);
  
      s = 0;
      av_assert1(w == h);
      for (level = 0; level < dec_count; level++)
          for (ori = level ? 1 : 0; ori < 4; ori++) {
              int size   = w >> (dec_count - level);
              int sx     = (ori & 1) ? size : 0;
              int stride = 32 << (dec_count - level);
              int sy     = (ori & 2) ? stride >> 1 : 0;
  
              for (i = 0; i < size; i++)
                  for (j = 0; j < size; j++) {
                      int v = tmp[sx + sy + i * stride + j] *
                              scale[type][dec_count - 3][level][ori];
                      s += FFABS(v);
                  }
          }
      av_assert1(s >= 0);
      return s >> 9;
  }
  
  static int w53_8_c(struct MpegEncContext *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
  {
      return w_c(v, pix1, pix2, line_size, 8, h, 1);
  }
  
  static int w97_8_c(struct MpegEncContext *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
  {
      return w_c(v, pix1, pix2, line_size, 8, h, 0);
  }
  
  static int w53_16_c(struct MpegEncContext *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
  {
      return w_c(v, pix1, pix2, line_size, 16, h, 1);
  }
  
  static int w97_16_c(struct MpegEncContext *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
  {
      return w_c(v, pix1, pix2, line_size, 16, h, 0);
  }
  
  int ff_w53_32_c(struct MpegEncContext *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
  {
      return w_c(v, pix1, pix2, line_size, 32, h, 1);
  }
  
  int ff_w97_32_c(struct MpegEncContext *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
  {
      return w_c(v, pix1, pix2, line_size, 32, h, 0);
  }
  
  void ff_dsputil_init_dwt(DSPContext *c)
  {
      c->w53[0] = w53_16_c;
      c->w53[1] = w53_8_c;
      c->w97[0] = w97_16_c;
      c->w97[1] = w97_8_c;
  }
  
  void ff_dwt_init(SnowDWTContext *c)
  {
      c->vertical_compose97i   = ff_snow_vertical_compose97i;
      c->horizontal_compose97i = ff_snow_horizontal_compose97i;
      c->inner_add_yblock      = ff_snow_inner_add_yblock;
  
      if (HAVE_MMX)
          ff_dwt_init_x86(c);
  }
  
  
  