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/*
* motion.c: Motion compensation code
*
* Written by: Ullrich Hafner
* Michael Unger
*
* This file is part of FIASCO («F»ractal «I»mage «A»nd «S»equence «CO»dec)
* Copyright (C) 1994-2000 Ullrich Hafner <hafner@bigfoot.de>
*/
/*
* $Date: 2000/06/14 20:50:51 $
* $Author: hafner $
* $Revision: 5.1 $
* $State: Exp $
*/
#include "config.h"
#include <string.h>
#include "types.h"
#include "macros.h"
#include "error.h"
#include "image.h"
#include "misc.h"
#include "motion.h"
/*****************************************************************************
public code
*****************************************************************************/
void
restore_mc (int enlarge_factor, image_t *image, const image_t *past,
const image_t *future, const wfa_t *wfa)
/*
* Restore motion compensated prediction of 'image' represented by 'wfa'.
* If 'enlarge_factor' != 0 then enlarge image by given amount.
* Reference frames are given by 'past' and 'future'.
*
* No return values.
*/
{
unsigned state, label;
unsigned root_state;
word_t *mcblock1, *mcblock2; /* MC blocks */
#define FX(v) ((image->format == FORMAT_4_2_0) && band != Y ? ((v) / 2) : v)
mcblock1 = Calloc (size_of_level (max ((int) wfa->wfainfo->p_max_level
+ 2 * enlarge_factor, 0)),
sizeof (word_t));
mcblock2 = Calloc (size_of_level (max ((int) wfa->wfainfo->p_max_level
+ 2 * enlarge_factor, 0)),
sizeof (word_t));
if (!image->color)
root_state = wfa->root_state;
else
root_state = wfa->tree [wfa->tree [wfa->root_state][0]][0];
for (state = wfa->basis_states; state <= root_state; state++)
for (label = 0; label < MAXLABELS; label++)
if (wfa->mv_tree[state][label].type != NONE)
{
color_e band;
unsigned level = wfa->level_of_state [state] - 1;
unsigned width = width_of_level (level);
unsigned height = height_of_level (level);
unsigned offset = image->width - width;
switch (wfa->mv_tree [state][label].type)
{
case FORWARD:
for (band = first_band (image->color);
band <= last_band (image->color); band++)
{
extract_mc_block (mcblock1, FX (width), FX (height),
past->pixels [band], FX (past->width),
wfa->wfainfo->half_pixel,
FX (wfa->x [state][label]),
FX (wfa->y [state][label]),
FX (wfa->mv_tree [state][label].fx),
FX (wfa->mv_tree [state][label].fy));
{
word_t *mc1; /* current pixel in MC block */
word_t *orig; /* current pixel in original image */
unsigned x, y; /* pixel coordinates */
mc1 = mcblock1;
orig = (word_t *) image->pixels [band]
+ FX (wfa->x[state][label])
+ FX (wfa->y[state][label]) * FX (image->width);
for (y = FX (height); y; y--)
{
for (x = FX (width); x; x--)
*orig++ += *mc1++;
orig += FX (offset);
}
}
}
break;
case BACKWARD:
for (band = first_band (image->color);
band <= last_band (image->color); band++)
{
extract_mc_block (mcblock1, FX (width), FX (height),
future->pixels [band],
FX (future->width),
wfa->wfainfo->half_pixel,
FX (wfa->x [state][label]),
FX (wfa->y [state][label]),
FX (wfa->mv_tree [state][label].bx),
FX (wfa->mv_tree [state][label].by));
{
word_t *mc1; /* current pixel in MC block 1 */
word_t *orig; /* current pixel in original image */
unsigned x, y; /* pixel coordinates */
mc1 = mcblock1;
orig = (word_t *) image->pixels [band]
+ FX (wfa->x[state][label])
+ FX (wfa->y[state][label]) * FX (image->width);
for (y = FX (height); y; y--)
{
for (x = FX (width); x; x--)
*orig++ += *mc1++;
orig += FX (offset);
}
}
}
break;
case INTERPOLATED:
for (band = first_band (image->color);
band <= last_band (image->color); band++)
{
extract_mc_block (mcblock1, FX (width), FX (height),
past->pixels [band], FX (past->width),
wfa->wfainfo->half_pixel,
FX (wfa->x[state][label]),
FX (wfa->y[state][label]),
FX (wfa->mv_tree[state][label].fx),
FX (wfa->mv_tree[state][label].fy));
extract_mc_block (mcblock2, FX (width), FX (height),
future->pixels [band],
FX (future->width),
wfa->wfainfo->half_pixel,
FX (wfa->x[state][label]),
FX (wfa->y[state][label]),
FX (wfa->mv_tree[state][label].bx),
FX (wfa->mv_tree[state][label].by));
{
word_t *mc1; /* current pixel in MC block 1 */
word_t *mc2; /* current pixel in MC block 1 */
word_t *orig; /* current pixel in original image */
unsigned x, y; /* pixel coordinates */
mc1 = mcblock1;
mc2 = mcblock2;
orig = (word_t *) image->pixels [band]
+ FX (wfa->x[state][label])
+ FX (wfa->y[state][label]) * FX (image->width);
for (y = FX (height); y; y--)
{
for (x = FX (width); x; x--)
#ifdef HAVE_SIGNED_SHIFT
*orig++ += (*mc1++ + *mc2++) >> 1;
#else /* not HAVE_SIGNED_SHIFT */
*orig++ += (*mc1++ + *mc2++) / 2;
#endif /* not HAVE_SIGNED_SHIFT */
orig += FX (offset);
}
}
}
break;
default:
break;
}
}
if (image->color)
{
unsigned n;
word_t *ptr;
static int *clipping = NULL;
unsigned shift = image->format == FORMAT_4_2_0 ? 2 : 0;
if (!clipping) /* initialize clipping table */
{
int i;
clipping = Calloc (256 * 3, sizeof (int));
for (i = -128; i < 128; i++)
clipping [256 + i + 128] = i;
for (i = 0; i < 256; i++)
clipping [i] = clipping [256];
for (i = 512; i < 512 + 256; i++)
clipping [i] = clipping [511];
clipping += 256 + 128;
}
ptr = image->pixels [Cb];
for (n = (image->width * image->height) >> shift; n; n--, ptr++)
#ifdef HAVE_SIGNED_SHIFT
*ptr = clipping [*ptr >> 4] << 4;
#else /* not HAVE_SIGNED_SHIFT */
*ptr = clipping [*ptr / 16] * 16;
#endif /* not HAVE_SIGNED_SHIFT */
ptr = image->pixels [Cr];
for (n = (image->width * image->height) >> shift; n; n--, ptr++)
#ifdef HAVE_SIGNED_SHIFT
*ptr = clipping [*ptr >> 4] << 4;
#else /* not HAVE_SIGNED_SHIFT */
*ptr = clipping [*ptr / 16] * 16;
#endif /* not HAVE_SIGNED_SHIFT */
}
Free (mcblock1);
Free (mcblock2);
}
void
extract_mc_block (word_t *mcblock, unsigned width, unsigned height,
const word_t *reference, unsigned ref_width,
bool_t half_pixel, unsigned xo, unsigned yo,
unsigned mx, unsigned my)
/*
* Extract motion compensation image 'mcblock' of size 'width'x'height'
* from 'reference' image (width is given by 'ref_width').
* Coordinates of reference block are given by ('xo' + 'mx', 'yo' + 'my').
* Use 'half_pixel' precision if specified.
*
* No return value.
*
* Side effects:
* 'mcblock[]' MCPE block is filled with reference pixels
*/
{
if (!half_pixel) /* Fullpixel precision */
{
const word_t *rblock; /* pointer to reference image */
unsigned y; /* current row */
rblock = reference + (yo + my) * ref_width + (xo + mx);
for (y = height; y; y--)
{
memcpy (mcblock, rblock, width * sizeof (word_t));
mcblock += width;
rblock += ref_width;
}
}
else /* Halfpixel precision */
{
unsigned x, y; /* current coordinates */
unsigned offset; /* remaining pixels in row */
const word_t *rblock; /* pointer to reference image */
const word_t *ryblock; /* pointer to next line */
const word_t *rxblock; /* pointer to next column */
const word_t *rxyblock; /* pointer to next column & row */
rblock = reference + (yo + my / 2) * ref_width + (xo + mx / 2);
ryblock = rblock + ref_width; /* pixel in next row */
rxblock = rblock + 1; /* pixel in next column */
rxyblock = ryblock + 1; /* pixel in next row & column */
offset = ref_width - width;
if ((mx & 1) == 0)
{
if ((my & 1) == 0) /* Don't use halfpixel refinement */
for (y = height; y; y--)
{
memcpy (mcblock, rblock, width * sizeof (word_t));
mcblock += width;
rblock += ref_width;
}
else /* Halfpixel in y direction */
for (y = height; y; y--)
{
for (x = width; x; x--)
#ifdef HAVE_SIGNED_SHIFT
*mcblock++ = (*rblock++ + *ryblock++) >> 1;
#else /* not HAVE_SIGNED_SHIFT */
*mcblock++ = (*rblock++ + *ryblock++) / 2;
#endif /* not HAVE_SIGNED_SHIFT */
rblock += offset;
ryblock += offset;
}
}
else
{
if ((my & 1) == 0) /* Halfpixel in x direction */
for (y = height; y; y--)
{
for (x = width; x; x--)
#ifdef HAVE_SIGNED_SHIFT
*mcblock++ = (*rblock++ + *rxblock++) >> 1;
#else /* not HAVE_SIGNED_SHIFT */
*mcblock++ = (*rblock++ + *rxblock++) / 2;
#endif /* not HAVE_SIGNED_SHIFT */
rblock += offset;
rxblock += offset;
}
else /* Halfpixel in xy direction */
for (y = height; y; y--)
{
for (x = width; x; x--)
#ifdef HAVE_SIGNED_SHIFT
*mcblock++ = (*rblock++ + *rxblock++
+ *ryblock++ + *rxyblock++) >> 2;
#else /* not HAVE_SIGNED_SHIFT */
*mcblock++ = (*rblock++ + *rxblock++
+ *ryblock++ + *rxyblock++) / 4;
#endif /* not HAVE_SIGNED_SHIFT */
rblock += offset;
ryblock += offset;
rxblock += offset;
rxyblock += offset;
}
}
}
}
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