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FFmpeg/libavcodec/motion_est.c

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/*
* Motion estimation
* Copyright (c) 2000,2001 Gerard Lantau.
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
static void halfpel_motion_search(MpegEncContext * s,
int *mx_ptr, int *my_ptr, int dmin,
int xmin, int ymin, int xmax, int ymax);
/* config it to test motion vector encoding (send random vectors) */
//#define CONFIG_TEST_MV_ENCODE
static int pix_sum(UINT8 * pix, int line_size)
{
int s, i, j;
s = 0;
for (i = 0; i < 16; i++) {
for (j = 0; j < 16; j += 8) {
s += pix[0];
s += pix[1];
s += pix[2];
s += pix[3];
s += pix[4];
s += pix[5];
s += pix[6];
s += pix[7];
pix += 8;
}
pix += line_size - 16;
}
return s;
}
static int pix_norm1(UINT8 * pix, int line_size)
{
int s, i, j;
UINT32 *sq = squareTbl + 256;
s = 0;
for (i = 0; i < 16; i++) {
for (j = 0; j < 16; j += 8) {
s += sq[pix[0]];
s += sq[pix[1]];
s += sq[pix[2]];
s += sq[pix[3]];
s += sq[pix[4]];
s += sq[pix[5]];
s += sq[pix[6]];
s += sq[pix[7]];
pix += 8;
}
pix += line_size - 16;
}
return s;
}
static int pix_norm(UINT8 * pix1, UINT8 * pix2, int line_size)
{
int s, i, j;
UINT32 *sq = squareTbl + 256;
s = 0;
for (i = 0; i < 16; i++) {
for (j = 0; j < 16; j += 8) {
s += sq[pix1[0] - pix2[0]];
s += sq[pix1[1] - pix2[1]];
s += sq[pix1[2] - pix2[2]];
s += sq[pix1[3] - pix2[3]];
s += sq[pix1[4] - pix2[4]];
s += sq[pix1[5] - pix2[5]];
s += sq[pix1[6] - pix2[6]];
s += sq[pix1[7] - pix2[7]];
pix1 += 8;
pix2 += 8;
}
pix1 += line_size - 16;
pix2 += line_size - 16;
}
return s;
}
static void no_motion_search(MpegEncContext * s,
int *mx_ptr, int *my_ptr)
{
*mx_ptr = 16 * s->mb_x;
*my_ptr = 16 * s->mb_y;
}
static int full_motion_search(MpegEncContext * s,
int *mx_ptr, int *my_ptr, int range,
int xmin, int ymin, int xmax, int ymax)
{
int x1, y1, x2, y2, xx, yy, x, y;
int mx, my, dmin, d;
UINT8 *pix;
xx = 16 * s->mb_x;
yy = 16 * s->mb_y;
x1 = xx - range + 1; /* we loose one pixel to avoid boundary pb with half pixel pred */
if (x1 < xmin)
x1 = xmin;
x2 = xx + range - 1;
if (x2 > xmax)
x2 = xmax;
y1 = yy - range + 1;
if (y1 < ymin)
y1 = ymin;
y2 = yy + range - 1;
if (y2 > ymax)
y2 = ymax;
pix = s->new_picture[0] + (yy * s->linesize) + xx;
dmin = 0x7fffffff;
mx = 0;
my = 0;
for (y = y1; y <= y2; y++) {
for (x = x1; x <= x2; x++) {
d = pix_abs16x16(pix, s->last_picture[0] + (y * s->linesize) + x,
s->linesize, 16);
if (d < dmin ||
(d == dmin &&
(abs(x - xx) + abs(y - yy)) <
(abs(mx - xx) + abs(my - yy)))) {
dmin = d;
mx = x;
my = y;
}
}
}
*mx_ptr = mx;
*my_ptr = my;
#if 0
if (*mx_ptr < -(2 * range) || *mx_ptr >= (2 * range) ||
*my_ptr < -(2 * range) || *my_ptr >= (2 * range)) {
fprintf(stderr, "error %d %d\n", *mx_ptr, *my_ptr);
}
#endif
return dmin;
}
static int log_motion_search(MpegEncContext * s,
int *mx_ptr, int *my_ptr, int range,
int xmin, int ymin, int xmax, int ymax)
{
int x1, y1, x2, y2, xx, yy, x, y;
int mx, my, dmin, d;
UINT8 *pix;
xx = s->mb_x << 4;
yy = s->mb_y << 4;
/* Left limit */
x1 = xx - range;
if (x1 < xmin)
x1 = xmin;
/* Right limit */
x2 = xx + range;
if (x2 > xmax)
x2 = xmax;
/* Upper limit */
y1 = yy - range;
if (y1 < ymin)
y1 = ymin;
/* Lower limit */
y2 = yy + range;
if (y2 > ymax)
y2 = ymax;
pix = s->new_picture[0] + (yy * s->linesize) + xx;
dmin = 0x7fffffff;
mx = 0;
my = 0;
do {
for (y = y1; y <= y2; y += range) {
for (x = x1; x <= x2; x += range) {
d = pix_abs16x16(pix, s->last_picture[0] + (y * s->linesize) + x, s->linesize, 16);
if (d < dmin || (d == dmin && (abs(x - xx) + abs(y - yy)) < (abs(mx - xx) + abs(my - yy)))) {
dmin = d;
mx = x;
my = y;
}
}
}
range = range >> 1;
x1 = mx - range;
if (x1 < xmin)
x1 = xmin;
x2 = mx + range;
if (x2 > xmax)
x2 = xmax;
y1 = my - range;
if (y1 < ymin)
y1 = ymin;
y2 = my + range;
if (y2 > ymax)
y2 = ymax;
} while (range >= 1);
#ifdef DEBUG
fprintf(stderr, "log - MX: %d\tMY: %d\n", mx, my);
#endif
*mx_ptr = mx;
*my_ptr = my;
return dmin;
}
static int phods_motion_search(MpegEncContext * s,
int *mx_ptr, int *my_ptr, int range,
int xmin, int ymin, int xmax, int ymax)
{
int x1, y1, x2, y2, xx, yy, x, y, lastx, d;
int mx, my, dminx, dminy;
UINT8 *pix;
xx = s->mb_x << 4;
yy = s->mb_y << 4;
/* Left limit */
x1 = xx - range;
if (x1 < xmin)
x1 = xmin;
/* Right limit */
x2 = xx + range;
if (x2 > xmax)
x2 = xmax;
/* Upper limit */
y1 = yy - range;
if (y1 < ymin)
y1 = ymin;
/* Lower limit */
y2 = yy + range;
if (y2 > ymax)
y2 = ymax;
pix = s->new_picture[0] + (yy * s->linesize) + xx;
mx = 0;
my = 0;
x = xx;
y = yy;
do {
dminx = 0x7fffffff;
dminy = 0x7fffffff;
lastx = x;
for (x = x1; x <= x2; x += range) {
d = pix_abs16x16(pix, s->last_picture[0] + (y * s->linesize) + x, s->linesize, 16);
if (d < dminx || (d == dminx && (abs(x - xx) + abs(y - yy)) < (abs(mx - xx) + abs(my - yy)))) {
dminx = d;
mx = x;
}
}
x = lastx;
for (y = y1; y <= y2; y += range) {
d = pix_abs16x16(pix, s->last_picture[0] + (y * s->linesize) + x, s->linesize, 16);
if (d < dminy || (d == dminy && (abs(x - xx) + abs(y - yy)) < (abs(mx - xx) + abs(my - yy)))) {
dminy = d;
my = y;
}
}
range = range >> 1;
x = mx;
y = my;
x1 = mx - range;
if (x1 < xmin)
x1 = xmin;
x2 = mx + range;
if (x2 > xmax)
x2 = xmax;
y1 = my - range;
if (y1 < ymin)
y1 = ymin;
y2 = my + range;
if (y2 > ymax)
y2 = ymax;
} while (range >= 1);
#ifdef DEBUG
fprintf(stderr, "phods - MX: %d\tMY: %d\n", mx, my);
#endif
/* half pixel search */
*mx_ptr = mx;
*my_ptr = my;
return dminy;
}
/* The idea would be to make half pel ME after Inter/Intra decision to
save time. */
static void halfpel_motion_search(MpegEncContext * s,
int *mx_ptr, int *my_ptr, int dmin,
int xmin, int ymin, int xmax, int ymax)
{
int mx, my, mx1, my1, d, xx, yy, dminh;
UINT8 *pix;
mx = *mx_ptr << 1;
my = *my_ptr << 1;
xx = 16 * s->mb_x;
yy = 16 * s->mb_y;
dminh = dmin;
/* Half pixel search */
mx1 = mx;
my1 = my;
pix = s->new_picture[0] + (yy * s->linesize) + xx;
if ((mx > (xmin << 1)) && mx < (xmax << 1) &&
(my > (ymin << 1)) && my < (ymax << 1)) {
int dx, dy, px, py;
UINT8 *ptr;
for (dy = -1; dy <= 1; dy++) {
for (dx = -1; dx <= 1; dx++) {
if (dx != 0 || dy != 0) {
px = mx1 + dx;
py = my1 + dy;
ptr = s->last_picture[0] + ((py >> 1) * s->linesize) + (px >> 1);
switch (((py & 1) << 1) | (px & 1)) {
default:
case 0:
d = pix_abs16x16(pix, ptr, s->linesize, 16);
break;
case 1:
d = pix_abs16x16_x2(pix, ptr, s->linesize, 16);
break;
case 2:
d = pix_abs16x16_y2(pix, ptr, s->linesize, 16);
break;
case 3:
d = pix_abs16x16_xy2(pix, ptr, s->linesize, 16);
break;
}
if (d < dminh) {
dminh = d;
mx = px;
my = py;
}
}
}
}
}
*mx_ptr = mx - (xx << 1);
*my_ptr = my - (yy << 1);
//fprintf(stderr,"half - MX: %d\tMY: %d\n",*mx_ptr ,*my_ptr);
}
#ifndef CONFIG_TEST_MV_ENCODE
int estimate_motion(MpegEncContext * s,
int mb_x, int mb_y,
int *mx_ptr, int *my_ptr)
{
UINT8 *pix, *ppix;
int sum, varc, vard, mx, my, range, dmin, xx, yy;
int xmin, ymin, xmax, ymax;
range = 8 * (1 << (s->f_code - 1));
/* XXX: temporary kludge to avoid overflow for msmpeg4 */
if (s->out_format == FMT_H263 && !s->h263_msmpeg4)
range = range * 2;
if (s->unrestricted_mv) {
xmin = -16;
ymin = -16;
if(s->avctx==NULL || s->avctx->codec->id!=CODEC_ID_MPEG4){
xmax = s->mb_width*16;
ymax = s->mb_height*16;
}else {
/* XXX: dunno if this is correct but ffmpeg4 decoder wont like it otherwise
(cuz the drawn edge isnt large enough))*/
xmax = s->width;
ymax = s->height;
}
} else {
xmin = 0;
ymin = 0;
xmax = s->mb_width*16 - 16;
ymax = s->mb_height*16 - 16;
}
switch(s->full_search) {
case ME_ZERO:
default:
no_motion_search(s, &mx, &my);
dmin = 0;
break;
case ME_FULL:
dmin = full_motion_search(s, &mx, &my, range, xmin, ymin, xmax, ymax);
break;
case ME_LOG:
dmin = log_motion_search(s, &mx, &my, range / 2, xmin, ymin, xmax, ymax);
break;
case ME_PHODS:
dmin = phods_motion_search(s, &mx, &my, range / 2, xmin, ymin, xmax, ymax);
break;
}
emms_c();
/* intra / predictive decision */
xx = mb_x * 16;
yy = mb_y * 16;
pix = s->new_picture[0] + (yy * s->linesize) + xx;
/* At this point (mx,my) are full-pell and the absolute displacement */
ppix = s->last_picture[0] + (my * s->linesize) + mx;
sum = pix_sum(pix, s->linesize);
varc = pix_norm1(pix, s->linesize);
vard = pix_norm(pix, ppix, s->linesize);
vard = vard >> 8;
sum = sum >> 8;
varc = (varc >> 8) - (sum * sum);
s->mb_var[s->mb_width * mb_y + mb_x] = varc;
s->avg_mb_var += varc;
#if 0
printf("varc=%4d avg_var=%4d (sum=%4d) vard=%4d mx=%2d my=%2d\n",
varc, s->avg_mb_var, sum, vard, mx - xx, my - yy);
#endif
if (vard <= 64 || vard < varc) {
if (s->full_search != ME_ZERO) {
halfpel_motion_search(s, &mx, &my, dmin, xmin, ymin, xmax, ymax);
} else {
mx -= 16 * s->mb_x;
my -= 16 * s->mb_y;
}
*mx_ptr = mx;
*my_ptr = my;
return 0;
} else {
*mx_ptr = 0;
*my_ptr = 0;
return 1;
}
}
#else
/* test version which generates valid random vectors */
int estimate_motion(MpegEncContext * s,
int mb_x, int mb_y,
int *mx_ptr, int *my_ptr)
{
int xx, yy, x1, y1, x2, y2, range;
if ((random() % 10) >= 5) {
range = 8 * (1 << (s->f_code - 1));
if (s->out_format == FMT_H263 && !s->h263_msmpeg4)
range = range * 2;
xx = 16 * s->mb_x;
yy = 16 * s->mb_y;
x1 = xx - range;
if (x1 < 0)
x1 = 0;
x2 = xx + range - 1;
if (x2 > (s->width - 16))
x2 = s->width - 16;
y1 = yy - range;
if (y1 < 0)
y1 = 0;
y2 = yy + range - 1;
if (y2 > (s->height - 16))
y2 = s->height - 16;
*mx_ptr = (random() % (2 * (x2 - x1 + 1))) + 2 * (x1 - xx);
*my_ptr = (random() % (2 * (y2 - y1 + 1))) + 2 * (y1 - yy);
return 0;
} else {
*mx_ptr = 0;
*my_ptr = 0;
return 1;
}
}
#endif