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better inter/intra decission algo (same as xvid) 

Originally committed as revision 352 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-03-23 12:39:45 +00:00
parent 72a52b3142
commit b398777148
1 changed files with 30 additions and 8 deletions
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38
libavcodec/motion_est.c
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@ -25,6 +25,9 @@
#include "dsputil.h"
#include "mpegvideo.h"
#define ABS(a) ((a)>0 ? (a) : -(a))
#define INTER_BIAS 257
static void halfpel_motion_search(MpegEncContext * s,
int *mx_ptr, int *my_ptr, int dmin,
int xmin, int ymin, int xmax, int ymax,
@ -55,6 +58,28 @@ static int pix_sum(UINT8 * pix, int line_size)
return s;
}
static int pix_dev(UINT8 * pix, int line_size, int mean)
{
int s, i, j;
s = 0;
for (i = 0; i < 16; i++) {
for (j = 0; j < 16; j += 8) {
s += ABS(pix[0]-mean);
s += ABS(pix[1]-mean);
s += ABS(pix[2]-mean);
s += ABS(pix[3]-mean);
s += ABS(pix[4]-mean);
s += ABS(pix[5]-mean);
s += ABS(pix[6]-mean);
s += ABS(pix[7]-mean);
pix += 8;
}
pix += line_size - 16;
}
return s;
}
static int pix_norm1(UINT8 * pix, int line_size)
{
int s, i, j;
@ -732,21 +757,18 @@ int estimate_motion(MpegEncContext * s,
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);
varc = pix_dev(pix, s->linesize, (sum+128)>>8);
vard = pix_abs16x16(pix, ppix, s->linesize, 16);
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;
s->mc_mb_var += vard;
#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 (vard <= 64 || vard < varc + INTER_BIAS) {
if (s->full_search != ME_ZERO) {
halfpel_motion_search(s, &mx, &my, dmin, xmin, ymin, xmax, ymax, pred_x, pred_y);
} else {
@ -754,7 +776,7 @@ int estimate_motion(MpegEncContext * s,
my -= 16 * s->mb_y;
}
// check(mx + 32*s->mb_x, my + 32*s->mb_y, 1, end)
*mx_ptr = mx;
*my_ptr = my;
return 0;