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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "img_format.h"
#include "mp_image.h"
#include "vf.h"
struct vf_priv_s {
int x1,y1,x2,y2;
int limit;
int round;
int fno;
};
static int checkline(unsigned char* src,int stride,int len,int bpp){
int total=0;
int div=len;
switch(bpp){
case 1:
while(--len>=0){
total+=src[0]; src+=stride;
}
break;
case 3:
case 4:
while(--len>=0){
total+=src[0]+src[1]+src[2]; src+=stride;
}
div*=3;
break;
}
total/=div;
// printf("total=%d\n",total);
return total;
}
//===========================================================================//
static int config(struct vf_instance* vf,
int width, int height, int d_width, int d_height,
unsigned int flags, unsigned int outfmt){
vf->priv->x1=width - 1;
vf->priv->y1=height - 1;
vf->priv->x2=0;
vf->priv->y2=0;
vf->priv->fno=0;
return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
}
static int put_image(struct vf_instance* vf, mp_image_t *mpi, double pts){
mp_image_t *dmpi;
int bpp=mpi->bpp/8;
int w,h,x,y,shrink_by;
// hope we'll get DR buffer:
dmpi=vf_get_image(vf->next,mpi->imgfmt,
MP_IMGTYPE_EXPORT, 0,
mpi->w, mpi->h);
dmpi->planes[0]=mpi->planes[0];
dmpi->planes[1]=mpi->planes[1];
dmpi->planes[2]=mpi->planes[2];
dmpi->stride[0]=mpi->stride[0];
dmpi->stride[1]=mpi->stride[1];
dmpi->stride[2]=mpi->stride[2];
dmpi->width=mpi->width;
dmpi->height=mpi->height;
if(++vf->priv->fno>2){ // ignore first 2 frames - they may be empty
for(y=0;y<vf->priv->y1;y++){
if(checkline(mpi->planes[0]+mpi->stride[0]*y,bpp,mpi->w,bpp)>vf->priv->limit){
vf->priv->y1=y;
break;
}
}
for(y=mpi->h-1;y>vf->priv->y2;y--){
if(checkline(mpi->planes[0]+mpi->stride[0]*y,bpp,mpi->w,bpp)>vf->priv->limit){
vf->priv->y2=y;
break;
}
}
for(y=0;y<vf->priv->x1;y++){
if(checkline(mpi->planes[0]+bpp*y,mpi->stride[0],mpi->h,bpp)>vf->priv->limit){
vf->priv->x1=y;
break;
}
}
for(y=mpi->w-1;y>vf->priv->x2;y--){
if(checkline(mpi->planes[0]+bpp*y,mpi->stride[0],mpi->h,bpp)>vf->priv->limit){
vf->priv->x2=y;
break;
}
}
// round x and y (up), important for yuv colorspaces
// make sure they stay rounded!
x=(vf->priv->x1+1)&(~1);
y=(vf->priv->y1+1)&(~1);
w = vf->priv->x2 - x + 1;
h = vf->priv->y2 - y + 1;
// w and h must be divisible by 2 as well because of yuv
// colorspace problems.
if (vf->priv->round <= 1)
vf->priv->round = 16;
if (vf->priv->round % 2)
vf->priv->round *= 2;
shrink_by = w % vf->priv->round;
w -= shrink_by;
x += (shrink_by / 2 + 1) & ~1;
shrink_by = h % vf->priv->round;
h -= shrink_by;
y += (shrink_by / 2 + 1) & ~1;
mp_tmsg(MSGT_VFILTER, MSGL_INFO, "[CROP] Crop area: X: %d..%d Y: %d..%d (-vf crop=%d:%d:%d:%d).\n",
vf->priv->x1,vf->priv->x2,
vf->priv->y1,vf->priv->y2,
w,h,x,y);
}
return vf_next_put_image(vf,dmpi, pts);
}
static int query_format(struct vf_instance* vf, unsigned int fmt) {
switch(fmt) {
// the default limit value works only right with YV12 right now.
case IMGFMT_YV12:
return vf_next_query_format(vf, fmt);
}
return 0;
}
//===========================================================================//
static int open(vf_instance_t *vf, char* args){
vf->config=config;
vf->put_image=put_image;
vf->query_format=query_format;
vf->priv=malloc(sizeof(struct vf_priv_s));
vf->priv->limit=24; // should be option
vf->priv->round = 0;
if(args) sscanf(args, "%d:%d",
&vf->priv->limit,
&vf->priv->round);
return 1;
}
const vf_info_t vf_info_cropdetect = {
"autodetect crop size",
"cropdetect",
"A'rpi",
"",
open,
NULL
};
//===========================================================================//
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