/*

 * 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 "libavutil/mem.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_calloc(line_count, sizeof(*buf->line));

    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;

}

static void 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;

}

static void 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)

        snow_horizontal_compose97i(b0, temp, width);

    if (y + 0 < (unsigned)height)

        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(MPVEncContext *v, const uint8_t *pix1, const 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]) * (1 << 4);

            tmp[32 * i + j + 1] = (pix1[j + 1] - pix2[j + 1]) * (1 << 4);

            tmp[32 * i + j + 2] = (pix1[j + 2] - pix2[j + 2]) * (1 << 4);

            tmp[32 * i + j + 3] = (pix1[j + 3] - pix2[j + 3]) * (1 << 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(MPVEncContext *v, const uint8_t *pix1, const 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(MPVEncContext *v, const uint8_t *pix1, const 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(MPVEncContext *v, const uint8_t *pix1, const 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(MPVEncContext *v, const uint8_t *pix1, const 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(MPVEncContext *v, const uint8_t *pix1, const 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(MPVEncContext *v, const uint8_t *pix1, const 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   = snow_vertical_compose97i;

    c->horizontal_compose97i = snow_horizontal_compose97i;

    c->inner_add_yblock      = ff_snow_inner_add_yblock;

#if ARCH_X86 && HAVE_MMX

    ff_dwt_init_x86(c);

#endif

}