libavcodec/dwt.c

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/*
 * 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 "dsputil.h"
#include "dwt.h"
#include "libavcodec/x86/dwt.h"

void 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 (sizeof(IDWTELEM *) * line_count);
    buf->data_stack  = av_malloc (sizeof(IDWTELEM *) * max_allocated_lines);

    for(i = 0; i < max_allocated_lines; i++){
        buf->data_stack[i] = av_malloc (sizeof(IDWTELEM) * line_width);
    }

    buf->data_stack_top = max_allocated_lines - 1;
}

IDWTELEM * ff_slice_buffer_load_line(slice_buffer * buf, int line)
{
    IDWTELEM * buffer;

    assert(buf->data_stack_top >= 0);
    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;

    assert(line >= 0 && line < buf->line_count);
    assert(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
inv_lift(IDWTELEM *dst, IDWTELEM *src, IDWTELEM *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);
    }
}

#ifndef liftS
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;

    assert(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 av_always_inline void
inv_liftS(IDWTELEM *dst, IDWTELEM *src, IDWTELEM *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;

    assert(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);
    }
}
#endif /* ! liftS */

static void horizontal_decompose53i(DWTELEM *b, int width){
    DWTELEM temp[width];
    const int width2 = width>>1;
    const int w2     = (width+1)>>1;
    int x;

    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    ];
#if 0
    {
    int A1,A2,A3,A4;
    A2  = temp[1       ];
    A4  = temp[0       ];
    A1  = temp[0+width2];
    A1 -= (A2 + A4) >> 1;
    A4 += (A1 + 1) >> 1;
    b[0 + width2] = A1;
    b[0       ]   = A4;
    for(x = 1; x + 1 < width2; x += 2){
        A3  = temp[x + width2];
        A4  = temp[x + 1     ];
        A3 -= (A2 + A4) >> 1;
        A2 += (A1 + A3 + 2) >> 2;
        b[x + width2] = A3;
        b[x         ] = A2;

        A1  = temp[x + 1 + width2];
        A2  = temp[x + 2         ];
        A1 -= (A2 + A4) >> 1;
        A4 += (A1 + A3 + 2) >> 2;
        b[x + 1 + width2] = A1;
        b[x + 1         ] = A4;
    }
    A3  = temp[width - 1];
    A3 -= A2;
    A2 += (A1 + A3 + 2) >> 2;
    b[width -1] = A3;
    b[width2-1] = A2;
    }
#else
    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);
#endif /* 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, 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, width);
        if(y + 2 < (unsigned)height) horizontal_decompose53i(b3, 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, int width){
    DWTELEM temp[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++){
#ifdef liftS
        b1[i] -= (W_BM * (b0[i] + b2[i]) + W_BO) >> W_BS;
#else
        b1[i] = (16 * 4 * b1[i] - 4 * (b0[i] + b2[i]) + W_BO * 5 + (5 << 27)) / (5 * 16) - (1 << 23);
#endif
    }
}

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, 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, width);
        if(y + 4 < (unsigned)height) horizontal_decompose97i(b5, 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, 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, width >> level, height >> level, stride << level); break;
        case DWT_53: spatial_decompose53i(buffer, width >> level, height >> level, stride << level); break;
        }
    }
}

static void horizontal_compose53i(IDWTELEM *b, int width){
    IDWTELEM temp[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, 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, width);
        if(y + 0 <(unsigned)height) horizontal_compose53i(b1, width);

    cs->b0 = b2;
    cs->b1 = b3;
    cs->y += 2;
}

static void spatial_compose53i_dy(DWTCompose *cs, IDWTELEM *buffer, 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, width);
        if(y + 0 < (unsigned)height) horizontal_compose53i(b1, width);

    cs->b0 = b2;
    cs->b1 = b3;
    cs->y += 2;
}

static void av_unused spatial_compose53i(IDWTELEM *buffer, int width, int height, int stride){
    DWTCompose cs;
    spatial_compose53i_init(&cs, buffer, height, stride);
    while(cs.y <= height)
        spatial_compose53i_dy(&cs, buffer, width, height, stride);
}


void ff_snow_horizontal_compose97i(IDWTELEM *b, int width){
    IDWTELEM temp[width];
    const int w2 = (width + 1) >> 1;

#if 0 //maybe more understadable but slower
    inv_lift (temp    , b      , b  + w2, 2, 1, 1, width,  W_DM, W_DO, W_DS, 0, 1);
    inv_lift (temp + 1, b  + w2, temp   , 2, 1, 2, width,  W_CM, W_CO, W_CS, 1, 1);

    inv_liftS(b      ,temp    ,temp + 1, 2, 2, 2, width,  W_BM, W_BO, W_BS, 0, 1);
    inv_lift (b + 1  ,temp + 1,b       , 2, 2, 2, width,  W_AM, W_AO, W_AS, 1, 0);
#else
    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];
#endif
}

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++){
#ifdef liftS
        b1[i] += (W_BM*(b0[i] + b2[i])+W_BO)>>W_BS;
#else
        b1[i] += (W_BM*(b0[i] + b2[i])+4*b1[i]+W_BO)>>W_BS;
#endif
    }
}

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;
#ifdef liftS
        b2[i] += (W_BM*(b1[i] + b3[i])+W_BO)>>W_BS;
#else
        b2[i] += (W_BM*(b1[i] + b3[i])+4*b2[i]+W_BO)>>W_BS;
#endif
        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(DWTContext *dsp, DWTCompose *cs, slice_buffer * sb, 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, width);
    if(y+0<(unsigned)height) dsp->horizontal_compose97i(b1, 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, 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, width);
    if(y+0<(unsigned)height) ff_snow_horizontal_compose97i(b1, width);

    cs->b0=b2;
    cs->b1=b3;
    cs->b2=b4;
    cs->b3=b5;
    cs->y += 2;
}

static void av_unused spatial_compose97i(IDWTELEM *buffer, int width, int height, int stride){
    DWTCompose cs;
    spatial_compose97i_init(&cs, buffer, height, stride);
    while(cs.y <= height)
        spatial_compose97i_dy(&cs, buffer, width, height, stride);
}

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(DWTContext *dsp, DWTCompose *cs, slice_buffer * slice_buf, 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, width>>level, height>>level, stride_line<<level);
                break;
            case DWT_53: spatial_compose53i_dy_buffered(cs+level, slice_buf, 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, 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, width>>level, height>>level, stride<<level);
                break;
            case DWT_53: spatial_compose53i_dy(cs+level, buffer, width>>level, height>>level, stride<<level);
                break;
            }
        }
    }
}

void ff_spatial_idwt(IDWTELEM *buffer, 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, width, height, stride, type, decomposition_count, y);
}

static inline int w_c(void *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];
    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, w, h, 32, type, dec_count);

    s=0;
    assert(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);
                }
            }
        }
    }
    assert(s>=0);
    return s>>9;
}

static int w53_8_c(void *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(void *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(void *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(void *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(void *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(void *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(DWTContext *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);
}


static av_always_inline
void interleave(IDWTELEM *dst, IDWTELEM *src0, IDWTELEM *src1, int w2, int add, int shift)
{
    int i;
    for (i = 0; i < w2; i++) {
        dst[2*i  ] = (src0[i] + add) >> shift;
        dst[2*i+1] = (src1[i] + add) >> shift;
    }
}

static void horizontal_compose_dirac53i(IDWTELEM *b, IDWTELEM *temp, int w)
{
    const int w2 = w >> 1;
    int x;

    temp[0] = COMPOSE_53iL0(b[w2], b[0], b[w2]);
    for (x = 1; x < w2; x++) {
        temp[x     ] = COMPOSE_53iL0     (b[x+w2-1], b[x     ], b[x+w2]);
        temp[x+w2-1] = COMPOSE_DIRAC53iH0(temp[x-1], b[x+w2-1], temp[x]);
    }
    temp[w-1] = COMPOSE_DIRAC53iH0(temp[w2-1], b[w-1], temp[w2-1]);

    interleave(b, temp, temp+w2, w2, 1, 1);
}

static void horizontal_compose_dd97i(IDWTELEM *b, IDWTELEM *tmp, int w)
{
    const int w2 = w >> 1;
    int x;

    tmp[0] = COMPOSE_53iL0(b[w2], b[0], b[w2]);
    for (x = 1; x < w2; x++)
        tmp[x] = COMPOSE_53iL0(b[x+w2-1], b[x], b[x+w2]);

    // extend the edges
    tmp[-1]   = tmp[0];
    tmp[w2+1] = tmp[w2] = tmp[w2-1];

    for (x = 0; x < w2; x++) {
        b[2*x  ] = (tmp[x] + 1)>>1;
        b[2*x+1] = (COMPOSE_DD97iH0(tmp[x-1], tmp[x], b[x+w2], tmp[x+1], tmp[x+2]) + 1)>>1;
    }
}

static void horizontal_compose_dd137i(IDWTELEM *b, IDWTELEM *tmp, int w)
{
    const int w2 = w >> 1;
    int x;

    tmp[0] = COMPOSE_DD137iL0(b[w2], b[w2], b[0], b[w2  ], b[w2+1]);
    tmp[1] = COMPOSE_DD137iL0(b[w2], b[w2], b[1], b[w2+1], b[w2+2]);
    for (x = 2; x < w2-1; x++)
        tmp[x] = COMPOSE_DD137iL0(b[x+w2-2], b[x+w2-1], b[x], b[x+w2], b[x+w2+1]);
    tmp[w2-1] = COMPOSE_DD137iL0(b[w-3], b[w-2], b[w2-1], b[w-1], b[w-1]);

    // extend the edges
    tmp[-1]   = tmp[0];
    tmp[w2+1] = tmp[w2] = tmp[w2-1];

    for (x = 0; x < w2; x++) {
        b[2*x  ] = (tmp[x] + 1)>>1;
        b[2*x+1] = (COMPOSE_DD97iH0(tmp[x-1], tmp[x], b[x+w2], tmp[x+1], tmp[x+2]) + 1)>>1;
    }
}

static av_always_inline
void horizontal_compose_haari(IDWTELEM *b, IDWTELEM *temp, int w, int shift)
{
    const int w2 = w >> 1;
    int x;

    for (x = 0; x < w2; x++) {
        temp[x   ] = COMPOSE_HAARiL0(b[x   ], b[x+w2]);
        temp[x+w2] = COMPOSE_HAARiH0(b[x+w2], temp[x]);
    }

    interleave(b, temp, temp+w2, w2, shift, shift);
}

static void horizontal_compose_haar0i(IDWTELEM *b, IDWTELEM *temp, int w)
{
    horizontal_compose_haari(b, temp, w, 0);
}

static void horizontal_compose_haar1i(IDWTELEM *b, IDWTELEM *temp, int w)
{
    horizontal_compose_haari(b, temp, w, 1);
}

static void horizontal_compose_fidelityi(IDWTELEM *b, IDWTELEM *tmp, int w)
{
    const int w2 = w >> 1;
    int i, x;
    IDWTELEM v[8];

    for (x = 0; x < w2; x++) {
        for (i = 0; i < 8; i++)
            v[i] = b[av_clip(x-3+i, 0, w2-1)];
        tmp[x] = COMPOSE_FIDELITYiH0(v[0], v[1], v[2], v[3], b[x+w2], v[4], v[5], v[6], v[7]);
    }

    for (x = 0; x < w2; x++) {
        for (i = 0; i < 8; i++)
            v[i] = tmp[av_clip(x-4+i, 0, w2-1)];
        tmp[x+w2] = COMPOSE_FIDELITYiL0(v[0], v[1], v[2], v[3], b[x], v[4], v[5], v[6], v[7]);
    }

    interleave(b, tmp+w2, tmp, w2, 0, 0);
}

static void horizontal_compose_daub97i(IDWTELEM *b, IDWTELEM *temp, int w)
{
    const int w2 = w >> 1;
    int x, b0, b1, b2;

    temp[0] = COMPOSE_DAUB97iL1(b[w2], b[0], b[w2]);
    for (x = 1; x < w2; x++) {
        temp[x     ] = COMPOSE_DAUB97iL1(b[x+w2-1], b[x     ], b[x+w2]);
        temp[x+w2-1] = COMPOSE_DAUB97iH1(temp[x-1], b[x+w2-1], temp[x]);
    }
    temp[w-1] = COMPOSE_DAUB97iH1(temp[w2-1], b[w-1], temp[w2-1]);

    // second stage combined with interleave and shift
    b0 = b2 = COMPOSE_DAUB97iL0(temp[w2], temp[0], temp[w2]);
    b[0] = (b0 + 1) >> 1;
    for (x = 1; x < w2; x++) {
        b2 = COMPOSE_DAUB97iL0(temp[x+w2-1], temp[x     ], temp[x+w2]);
        b1 = COMPOSE_DAUB97iH0(          b0, temp[x+w2-1], b2        );
        b[2*x-1] = (b1 + 1) >> 1;
        b[2*x  ] = (b2 + 1) >> 1;
        b0 = b2;
    }
    b[w-1] = (COMPOSE_DAUB97iH0(b2, temp[w-1], b2) + 1) >> 1;
}

static void vertical_compose_dirac53iH0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, int width)
{
    int i;

    for(i=0; i<width; i++){
        b1[i] = COMPOSE_DIRAC53iH0(b0[i], b1[i], b2[i]);
    }
}

static void vertical_compose_dd97iH0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
                                  IDWTELEM *b3, IDWTELEM *b4, int width)
{
    int i;

    for(i=0; i<width; i++){
        b2[i] = COMPOSE_DD97iH0(b0[i], b1[i], b2[i], b3[i], b4[i]);
    }
}

static void vertical_compose_dd137iL0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
                                      IDWTELEM *b3, IDWTELEM *b4, int width)
{
    int i;

    for(i=0; i<width; i++){
        b2[i] = COMPOSE_DD137iL0(b0[i], b1[i], b2[i], b3[i], b4[i]);
    }
}

static void vertical_compose_haar(IDWTELEM *b0, IDWTELEM *b1, int width)
{
    int i;

    for (i = 0; i < width; i++) {
        b0[i] = COMPOSE_HAARiL0(b0[i], b1[i]);
        b1[i] = COMPOSE_HAARiH0(b1[i], b0[i]);
    }
}

static void vertical_compose_fidelityiH0(IDWTELEM *dst, IDWTELEM *b[8], int width)
{
    int i;

    for(i=0; i<width; i++){
        dst[i] = COMPOSE_FIDELITYiH0(b[0][i], b[1][i], b[2][i], b[3][i], dst[i], b[4][i], b[5][i], b[6][i], b[7][i]);
    }
}

static void vertical_compose_fidelityiL0(IDWTELEM *dst, IDWTELEM *b[8], int width)
{
    int i;

    for(i=0; i<width; i++){
        dst[i] = COMPOSE_FIDELITYiL0(b[0][i], b[1][i], b[2][i], b[3][i], dst[i], b[4][i], b[5][i], b[6][i], b[7][i]);
    }
}

static void vertical_compose_daub97iH0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, int width)
{
    int i;

    for(i=0; i<width; i++){
        b1[i] = COMPOSE_DAUB97iH0(b0[i], b1[i], b2[i]);
    }
}

static void vertical_compose_daub97iH1(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, int width)
{
    int i;

    for(i=0; i<width; i++){
        b1[i] = COMPOSE_DAUB97iH1(b0[i], b1[i], b2[i]);
    }
}

static void vertical_compose_daub97iL0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, int width)
{
    int i;

    for(i=0; i<width; i++){
        b1[i] = COMPOSE_DAUB97iL0(b0[i], b1[i], b2[i]);
    }
}

static void vertical_compose_daub97iL1(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2, int width)
{
    int i;

    for(i=0; i<width; i++){
        b1[i] = COMPOSE_DAUB97iL1(b0[i], b1[i], b2[i]);
    }
}


static void spatial_compose_dd97i_dy(DWTContext *d, int level, int width, int height, int stride)
{
    vertical_compose_3tap vertical_compose_l0 = d->vertical_compose_l0;
    vertical_compose_5tap vertical_compose_h0 = d->vertical_compose_h0;
    DWTCompose *cs = d->cs + level;

    int i, y = cs->y;
    IDWTELEM *b[8];
    for (i = 0; i < 6; i++)
        b[i] = cs->b[i];
    b[6] = d->buffer + av_clip(y+5, 0, height-2)*stride;
    b[7] = d->buffer + av_clip(y+6, 1, height-1)*stride;

        if(y+5<(unsigned)height) vertical_compose_l0(      b[5], b[6], b[7],       width);
        if(y+1<(unsigned)height) vertical_compose_h0(b[0], b[2], b[3], b[4], b[6], width);

        if(y-1<(unsigned)height) d->horizontal_compose(b[0], d->temp, width);
        if(y+0<(unsigned)height) d->horizontal_compose(b[1], d->temp, width);

    for (i = 0; i < 6; i++)
        cs->b[i] = b[i+2];
    cs->y += 2;
}

static void spatial_compose_dirac53i_dy(DWTContext *d, int level, int width, int height, int stride)
{
    vertical_compose_3tap vertical_compose_l0 = d->vertical_compose_l0;
    vertical_compose_3tap vertical_compose_h0 = d->vertical_compose_h0;
    DWTCompose *cs = d->cs + level;

    int y= cs->y;
    IDWTELEM *b[4] = { cs->b[0], cs->b[1] };
    b[2] = d->buffer + mirror(y+1, height-1)*stride;
    b[3] = d->buffer + mirror(y+2, height-1)*stride;

        if(y+1<(unsigned)height) vertical_compose_l0(b[1], b[2], b[3], width);
        if(y+0<(unsigned)height) vertical_compose_h0(b[0], b[1], b[2], width);

        if(y-1<(unsigned)height) d->horizontal_compose(b[0], d->temp, width);
        if(y+0<(unsigned)height) d->horizontal_compose(b[1], d->temp, width);

    cs->b[0] = b[2];
    cs->b[1] = b[3];
    cs->y += 2;
}


static void spatial_compose_dd137i_dy(DWTContext *d, int level, int width, int height, int stride)
{
    vertical_compose_5tap vertical_compose_l0 = d->vertical_compose_l0;
    vertical_compose_5tap vertical_compose_h0 = d->vertical_compose_h0;
    DWTCompose *cs = d->cs + level;

    int i, y = cs->y;
    IDWTELEM *b[10];
    for (i = 0; i < 8; i++)
        b[i] = cs->b[i];
    b[8] = d->buffer + av_clip(y+7, 0, height-2)*stride;
    b[9] = d->buffer + av_clip(y+8, 1, height-1)*stride;

        if(y+5<(unsigned)height) vertical_compose_l0(b[3], b[5], b[6], b[7], b[9], width);
        if(y+1<(unsigned)height) vertical_compose_h0(b[0], b[2], b[3], b[4], b[6], width);

        if(y-1<(unsigned)height) d->horizontal_compose(b[0], d->temp, width);
        if(y+0<(unsigned)height) d->horizontal_compose(b[1], d->temp, width);

    for (i = 0; i < 8; i++)
        cs->b[i] = b[i+2];
    cs->y += 2;
}

// haar makes the assumption that height is even (always true for dirac)
static void spatial_compose_haari_dy(DWTContext *d, int level, int width, int height, int stride)
{
    vertical_compose_2tap vertical_compose = d->vertical_compose;
    int y = d->cs[level].y;
    IDWTELEM *b0 = d->buffer + (y-1)*stride;
    IDWTELEM *b1 = d->buffer + (y  )*stride;

    vertical_compose(b0, b1, width);
    d->horizontal_compose(b0, d->temp, width);
    d->horizontal_compose(b1, d->temp, width);

    d->cs[level].y += 2;
}

// Don't do sliced idwt for fidelity; the 9 tap filter makes it a bit annoying
// Fortunately, this filter isn't used in practice.
static void spatial_compose_fidelity(DWTContext *d, int level, int width, int height, int stride)
{
    vertical_compose_9tap vertical_compose_l0 = d->vertical_compose_l0;
    vertical_compose_9tap vertical_compose_h0 = d->vertical_compose_h0;
    int i, y;
    IDWTELEM *b[8];

    for (y = 1; y < height; y += 2) {
        for (i = 0; i < 8; i++)
            b[i] = d->buffer + av_clip((y-7 + 2*i), 0, height-2)*stride;
        vertical_compose_h0(d->buffer + y*stride, b, width);
    }

    for (y = 0; y < height; y += 2) {
        for (i = 0; i < 8; i++)
            b[i] = d->buffer + av_clip((y-7 + 2*i), 1, height-1)*stride;
        vertical_compose_l0(d->buffer + y*stride, b, width);
    }

    for (y = 0; y < height; y++)
        d->horizontal_compose(d->buffer + y*stride, d->temp, width);

    d->cs[level].y = height+1;
}

static void spatial_compose_daub97i_dy(DWTContext *d, int level, int width, int height, int stride)
{
    vertical_compose_3tap vertical_compose_l0 = d->vertical_compose_l0;
    vertical_compose_3tap vertical_compose_h0 = d->vertical_compose_h0;
    vertical_compose_3tap vertical_compose_l1 = d->vertical_compose_l1;
    vertical_compose_3tap vertical_compose_h1 = d->vertical_compose_h1;
    DWTCompose *cs = d->cs + level;

    int i, y = cs->y;
    IDWTELEM *b[6];
    for (i = 0; i < 4; i++)
        b[i] = cs->b[i];
    b[4] = d->buffer + mirror(y+3, height-1)*stride;
    b[5] = d->buffer + mirror(y+4, height-1)*stride;

        if(y+3<(unsigned)height) vertical_compose_l1(b[3], b[4], b[5], width);
        if(y+2<(unsigned)height) vertical_compose_h1(b[2], b[3], b[4], width);
        if(y+1<(unsigned)height) vertical_compose_l0(b[1], b[2], b[3], width);
        if(y+0<(unsigned)height) vertical_compose_h0(b[0], b[1], b[2], width);

        if(y-1<(unsigned)height) d->horizontal_compose(b[0], d->temp, width);
        if(y+0<(unsigned)height) d->horizontal_compose(b[1], d->temp, width);

    for (i = 0; i < 4; i++)
        cs->b[i] = b[i+2];
    cs->y += 2;
}


static void spatial_compose97i_init2(DWTCompose *cs, IDWTELEM *buffer, int height, int stride)
{
    cs->b[0] = buffer + mirror(-3-1, height-1)*stride;
    cs->b[1] = buffer + mirror(-3  , height-1)*stride;
    cs->b[2] = buffer + mirror(-3+1, height-1)*stride;
    cs->b[3] = buffer + mirror(-3+2, height-1)*stride;
    cs->y = -3;
}

static void spatial_compose53i_init2(DWTCompose *cs, IDWTELEM *buffer, int height, int stride)
{
    cs->b[0] = buffer + mirror(-1-1, height-1)*stride;
    cs->b[1] = buffer + mirror(-1  , height-1)*stride;
    cs->y = -1;
}

static void spatial_compose_dd97i_init(DWTCompose *cs, IDWTELEM *buffer, int height, int stride)
{
    cs->b[0] = buffer + av_clip(-5-1, 0, height-2)*stride;
    cs->b[1] = buffer + av_clip(-5  , 1, height-1)*stride;
    cs->b[2] = buffer + av_clip(-5+1, 0, height-2)*stride;
    cs->b[3] = buffer + av_clip(-5+2, 1, height-1)*stride;
    cs->b[4] = buffer + av_clip(-5+3, 0, height-2)*stride;
    cs->b[5] = buffer + av_clip(-5+4, 1, height-1)*stride;
    cs->y = -5;
}

static void spatial_compose_dd137i_init(DWTCompose *cs, IDWTELEM *buffer, int height, int stride)
{
    cs->b[0] = buffer + av_clip(-5-1, 0, height-2)*stride;
    cs->b[1] = buffer + av_clip(-5  , 1, height-1)*stride;
    cs->b[2] = buffer + av_clip(-5+1, 0, height-2)*stride;
    cs->b[3] = buffer + av_clip(-5+2, 1, height-1)*stride;
    cs->b[4] = buffer + av_clip(-5+3, 0, height-2)*stride;
    cs->b[5] = buffer + av_clip(-5+4, 1, height-1)*stride;
    cs->b[6] = buffer + av_clip(-5+5, 0, height-2)*stride;
    cs->b[7] = buffer + av_clip(-5+6, 1, height-1)*stride;
    cs->y = -5;
}

int ff_spatial_idwt_init2(DWTContext *d, IDWTELEM *buffer, int width, int height,
                          int stride, enum dwt_type type, int decomposition_count,
                          IDWTELEM *temp)
{
    int level;

    d->buffer = buffer;
    d->width = width;
    d->height = height;
    d->stride = stride;
    d->decomposition_count = decomposition_count;
    d->temp = temp + 8;

    for(level=decomposition_count-1; level>=0; level--){
        int hl = height >> level;
        int stride_l = stride << level;

        switch(type){
        case DWT_DIRAC_DD9_7:
            spatial_compose_dd97i_init(d->cs+level, buffer, hl, stride_l);
            break;
        case DWT_DIRAC_LEGALL5_3:
            spatial_compose53i_init2(d->cs+level, buffer, hl, stride_l);
            break;
        case DWT_DIRAC_DD13_7:
            spatial_compose_dd137i_init(d->cs+level, buffer, hl, stride_l);
            break;
        case DWT_DIRAC_HAAR0:
        case DWT_DIRAC_HAAR1:
            d->cs[level].y = 1;
            break;
        case DWT_DIRAC_DAUB9_7:
            spatial_compose97i_init2(d->cs+level, buffer, hl, stride_l);
            break;
        default:
            d->cs[level].y = 0;
            break;
        }
    }

    switch (type) {
    case DWT_DIRAC_DD9_7:
        d->spatial_compose = spatial_compose_dd97i_dy;
        d->vertical_compose_l0 = vertical_compose53iL0;
        d->vertical_compose_h0 = vertical_compose_dd97iH0;
        d->horizontal_compose = horizontal_compose_dd97i;
        d->support = 7;
        break;
    case DWT_DIRAC_LEGALL5_3:
        d->spatial_compose = spatial_compose_dirac53i_dy;
        d->vertical_compose_l0 = vertical_compose53iL0;
        d->vertical_compose_h0 = vertical_compose_dirac53iH0;
        d->horizontal_compose = horizontal_compose_dirac53i;
        d->support = 3;
        break;
    case DWT_DIRAC_DD13_7:
        d->spatial_compose = spatial_compose_dd137i_dy;
        d->vertical_compose_l0 = vertical_compose_dd137iL0;
        d->vertical_compose_h0 = vertical_compose_dd97iH0;
        d->horizontal_compose = horizontal_compose_dd137i;
        d->support = 7;
        break;
    case DWT_DIRAC_HAAR0:
    case DWT_DIRAC_HAAR1:
        d->spatial_compose = spatial_compose_haari_dy;
        d->vertical_compose = vertical_compose_haar;
        if (type == DWT_DIRAC_HAAR0)
            d->horizontal_compose = horizontal_compose_haar0i;
        else
            d->horizontal_compose = horizontal_compose_haar1i;
        d->support = 1;
        break;
    case DWT_DIRAC_FIDELITY:
        d->spatial_compose = spatial_compose_fidelity;
        d->vertical_compose_l0 = vertical_compose_fidelityiL0;
        d->vertical_compose_h0 = vertical_compose_fidelityiH0;
        d->horizontal_compose = horizontal_compose_fidelityi;
        break;
    case DWT_DIRAC_DAUB9_7:
        d->spatial_compose = spatial_compose_daub97i_dy;
        d->vertical_compose_l0 = vertical_compose_daub97iL0;
        d->vertical_compose_h0 = vertical_compose_daub97iH0;
        d->vertical_compose_l1 = vertical_compose_daub97iL1;
        d->vertical_compose_h1 = vertical_compose_daub97iH1;
        d->horizontal_compose = horizontal_compose_daub97i;
        d->support = 5;
        break;
    default:
        av_log(NULL, AV_LOG_ERROR, "Unknown wavelet type %d\n", type);
        return -1;
    }

    if (HAVE_MMX) ff_spatial_idwt_init_mmx(d, type);

    return 0;
}

void ff_spatial_idwt_slice2(DWTContext *d, int y)
{
    int level, support = d->support;

    for (level = d->decomposition_count-1; level >= 0; level--) {
        int wl = d->width  >> level;
        int hl = d->height >> level;
        int stride_l = d->stride << level;

        while (d->cs[level].y <= FFMIN((y>>level)+support, hl))
            d->spatial_compose(d, level, wl, hl, stride_l);
    }
}

int ff_spatial_idwt2(IDWTELEM *buffer, int width, int height, int stride,
                     enum dwt_type type, int decomposition_count, IDWTELEM *temp)
{
    DWTContext d;
    int y;

    if (ff_spatial_idwt_init2(&d, buffer, width, height, stride, type, decomposition_count, temp))
        return -1;

    for (y = 0; y < d.height; y += 4)
        ff_spatial_idwt_slice2(&d, y);

    return 0;
}

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