/*
  * 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 "me_cmp.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;

 
     if (!buf->line)
         return;
 

     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);
 

     if (buf->data_stack)
         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 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 + avpriv_mirror(-2 - 1, height - 1) * stride;
     DWTELEM *b1 = buffer + avpriv_mirror(-2,     height - 1) * stride;

 
     for (y = -2; y < height; y += 2) {

         DWTELEM *b2 = buffer + avpriv_mirror(y + 1, height - 1) * stride;
         DWTELEM *b3 = buffer + avpriv_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 + avpriv_mirror(-4 - 1, height - 1) * stride;
     DWTELEM *b1 = buffer + avpriv_mirror(-4,     height - 1) * stride;
     DWTELEM *b2 = buffer + avpriv_mirror(-4 + 1, height - 1) * stride;
     DWTELEM *b3 = buffer + avpriv_mirror(-4 + 2, height - 1) * stride;

 
     for (y = -4; y < height; y += 2) {

         DWTELEM *b4 = buffer + avpriv_mirror(y + 3, height - 1) * stride;
         DWTELEM *b5 = buffer + avpriv_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,

                                    avpriv_mirror(-1 - 1, height - 1) * stride_line);
     cs->b1 = slice_buffer_get_line(sb, avpriv_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 + avpriv_mirror(-1 - 1, height - 1) * stride;
     cs->b1 = buffer + avpriv_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,

                                          avpriv_mirror(y + 1, height - 1) *

                                          stride_line);
     IDWTELEM *b3 = slice_buffer_get_line(sb,

                                          avpriv_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 + avpriv_mirror(y + 1, height - 1) * stride;
     IDWTELEM *b3 = buffer + avpriv_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, avpriv_mirror(-3 - 1, height - 1) * stride_line);
     cs->b1 = slice_buffer_get_line(sb, avpriv_mirror(-3,     height - 1) * stride_line);
     cs->b2 = slice_buffer_get_line(sb, avpriv_mirror(-3 + 1, height - 1) * stride_line);
     cs->b3 = slice_buffer_get_line(sb, avpriv_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 + avpriv_mirror(-3 - 1, height - 1) * stride;
     cs->b1 = buffer + avpriv_mirror(-3,     height - 1) * stride;
     cs->b2 = buffer + avpriv_mirror(-3 + 1, height - 1) * stride;
     cs->b3 = buffer + avpriv_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,

                                          avpriv_mirror(y + 3, height - 1) *

                                          stride_line);
     IDWTELEM *b5 = slice_buffer_get_line(sb,

                                          avpriv_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 + avpriv_mirror(y + 3, height - 1) * stride;
     IDWTELEM *b5 = buffer + avpriv_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 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 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;

     spatial_idwt_init(cs, buffer, width, height, stride, type,

                          decomposition_count);
     for (y = 0; y < height; y += 4)

         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, ptrdiff_t 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, ptrdiff_t 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, ptrdiff_t 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, ptrdiff_t 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, ptrdiff_t 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, ptrdiff_t 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, ptrdiff_t line_size, int h)

 {
     return w_c(v, pix1, pix2, line_size, 32, h, 0);
 }
 

 av_cold void ff_dsputil_init_dwt(MECmpContext *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;
 }
 

 av_cold 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);
 }