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cliping MVs, i dunno if its correct but it looks better then without it 

Originally committed as revision 1543 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-02-04 01:32:25 +00:00
parent 6fa5a56c1b
commit b739d6762f
1 changed files with 31 additions and 6 deletions
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37
libavcodec/svq1.c
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@ -835,7 +835,19 @@ static int svq1_motion_inter_block (MpegEncContext *s, bit_buffer_t *bitbuf,
motion[0].y =
motion[(x / 8) + 2].y =
motion[(x / 8) + 3].y = mv.y;
if(y + (mv.y >> 1)<0)
mv.y= 0;
if(x + (mv.x >> 1)<0)
mv.x= 0;
#if 0
int w= (s->width+15)&~15;
int h= (s->height+15)&~15;
if(x + (mv.x >> 1)<0 || y + (mv.y >> 1)<0 || x + (mv.x >> 1) + 16 > w || y + (mv.y >> 1) + 16> h)
printf("%d %d %d %d\n", x, y, x + (mv.x >> 1), y + (mv.y >> 1));
#endif
src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1))*pitch];
dst = current;
@ -903,18 +915,31 @@ static int svq1_motion_inter_4v_block (MpegEncContext *s, bit_buffer_t *bitbuf,
/* form predictions */
for (i=0; i < 4; i++) {
src = &previous[(x + (pmv[i]->x >> 1)) + (y + (pmv[i]->y >> 1))*pitch];
dst = current;
int mvx= pmv[i]->x + (i&1)*16;
int mvy= pmv[i]->y + (i>>1)*16;
///XXX /FIXME cliping or padding?
if(y + (mvy >> 1)<0)
mvy= 0;
if(x + (mvx >> 1)<0)
mvx= 0;
s->dsp.put_pixels_tab[1][((pmv[i]->y & 1) << 1) | (pmv[i]->x & 1)](dst,src,pitch,8);
#if 0
int w= (s->width+15)&~15;
int h= (s->height+15)&~15;
if(x + (mvx >> 1)<0 || y + (mvy >> 1)<0 || x + (mvx >> 1) + 8 > w || y + (mvy >> 1) + 8> h)
printf("%d %d %d %d\n", x, y, x + (mvx >> 1), y + (mvy >> 1));
#endif
src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1))*pitch];
dst = current;
s->dsp.put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst,src,pitch,8);
/* select next block */
if (i & 1) {
current += 8*(pitch - 1);
previous += 8*(pitch - 1);
} else {
current += 8;
previous += 8;
}
}
@ -1000,7 +1025,7 @@ static int svq1_decode_frame_header (bit_buffer_t *bitbuf,MpegEncContext *s) {
s->pict_type= get_bits (bitbuf, 2)+1;
if(s->pict_type==4)
return -1;
if (s->pict_type == I_TYPE) {
/* unknown fields */