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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "mp_msg.h"
#include "mp_image.h"
#include "vf.h"
struct vf_priv_s {
int field;
};
//===========================================================================//
static int config(struct vf_instance_s* vf,
int width, int height, int d_width, int d_height,
unsigned int flags, unsigned int outfmt){
return vf_next_config(vf,width,height/2,d_width,d_height,flags,outfmt);
}
static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts){
vf->dmpi=vf_get_image(vf->next,mpi->imgfmt,
MP_IMGTYPE_EXPORT, MP_IMGFLAG_ACCEPT_STRIDE,
mpi->width, mpi->height/2);
// set up mpi as a double-stride image of dmpi:
vf->dmpi->planes[0]=mpi->planes[0]+mpi->stride[0]*vf->priv->field;
vf->dmpi->stride[0]=2*mpi->stride[0];
if(vf->dmpi->flags&MP_IMGFLAG_PLANAR){
vf->dmpi->planes[1]=mpi->planes[1]+
mpi->stride[1]*vf->priv->field;
vf->dmpi->stride[1]=2*mpi->stride[1];
vf->dmpi->planes[2]=mpi->planes[2]+
mpi->stride[2]*vf->priv->field;
vf->dmpi->stride[2]=2*mpi->stride[2];
} else
vf->dmpi->planes[1]=mpi->planes[1]; // passthru bgr8 palette!!!
return vf_next_put_image(vf,vf->dmpi, pts);
}
//===========================================================================//
static void uninit(struct vf_instance_s* vf)
{
free(vf->priv);
}
static int open(vf_instance_t *vf, char* args){
vf->config=config;
vf->put_image=put_image;
vf->uninit=uninit;
vf->default_reqs=VFCAP_ACCEPT_STRIDE;
vf->priv=calloc(1, sizeof(struct vf_priv_s));
if (args) sscanf(args, "%d", &vf->priv->field);
vf->priv->field &= 1;
return 1;
}
const vf_info_t vf_info_field = {
"extract single field",
"field",
"Rich Felker",
"",
open,
NULL
};
//===========================================================================//
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